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Готові списки джерел за темами / Hot process

Добірка наукової літератури з теми "Hot process"

Автор: Grafiati

Опубліковано: 13 вересня 2021

Оновлено: 2 лютого 2022

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Статті в журналах з теми "Hot process":

1

López, Beatriz, Beatriz Pereda, Felipe Bastos, and J. M. Rodriguez-Ibabe. "Study of Nb Solubility in Hot Charging Process." Materials Science Forum 1016 (January 2021): 832–39. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.832.

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The aim of this work is to investigate the dissolution behavior of Nb in hot charging hot rolling configurations. To do so, an indirect experimental procedure is used to quantify the amount of Nb present in solution before rolling. The method is based on the effect of dissolved Nb on static recrystallization kinetics due to its solute drag effect. After different thermal cycles, simulating cold and hot charging conditions, double hit torsion tests have been performed with a 0.23%C steel microalloyed with 0.03% Nb. By means of these tests, the static softening behavior has been determined. Comparison of the recrystallization times allows indirect evaluation of the amount of Nb in solid solution after each treatment. The results have been correlated with the precipitation state of the samples.

2

Naderi, Malek, Mostafa Ketabchi, Mahmoud Abbasi, and Wolfgang Bleak. "Semi-hot Stamping as an Improved Process of Hot Stamping." Journal of Materials Science & Technology 27, no. 4 (April 2011): 369–76. http://dx.doi.org/10.1016/s1005-0302(11)60076-5.

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3

Kumar, S. Ajeeth. "Tyre Retreading by Hot Retreading Process." International Journal of Applied Science and Engineering 4, no. 2 (2016): 61. http://dx.doi.org/10.5958/2322-0465.2016.00007.1.

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4

KOINOV, Toncho, and Junji KIHARA. "Process optimization for hot strip mill." Transactions of the Iron and Steel Institute of Japan 26, no. 10 (1986): 895–902. http://dx.doi.org/10.2355/isijinternational1966.26.895.

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5

Reardon, Brian J. "Optimizing the Hot Isostatic Pressing Process." Materials and Manufacturing Processes 18, no. 3 (January 8, 2003): 493–508. http://dx.doi.org/10.1081/amp-120022024.

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6

Atack, P. A., and I. S. Robinson. "Adaptation of hot mill process models." Journal of Materials Processing Technology 60, no. 1-4 (June 1996): 535–42. http://dx.doi.org/10.1016/0924-0136(96)02383-7.

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7

Yoshida, Yoshinori. "Numerical process simulation of hot forming." Journal of Japan Institute of Light Metals 71, no. 3 (March 15, 2021): 152–57. http://dx.doi.org/10.2464/jilm.71.152.

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8

Rolfe, Bernard, Amir Abdollahpoor, Xiang Jun Chen, Michael Pereira, and Na Min Xiao. "Robustness of the Tailored Hot Stamping Process." Advanced Materials Research 1063 (December 2014): 177–80. http://dx.doi.org/10.4028/www.scientific.net/amr.1063.177.

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The final mechanical properties of hot stamped components are affected by many process and material parameters due to the multidisciplinary nature of this thermal-mechanical-metallurgical process. The phase transformation, which depends on the temperature field and history, determines the final microstructure and consequently the final mechanical properties. Tailored hot stamping parts – where the cooling rates are locally chosen to achieve structures with graded properties – has been increasingly adopted in the automotive industry. Robustness of the final part properties is more critical than in the conventional hot stamping. In this paper, the robustness of a tailored hot stamping set-up is investigated. The results show that tailored hot stamping is very sensitive to tooling temperature, followed by latent heat radiation emissivity, and convection film coefficient. Traditional hot stamping has higher robustness compared to tailored hot stamping, with respect to the stamped component’s final material properties (i.e. phase fraction, hardness).

9

Jia, Zhining. "Process and property of hot-rolled stainless steel/carbon steel cladding bar." Functional materials 23, no. 2 (June 15, 2016): 243–48. http://dx.doi.org/10.15407/fm23.02.243.

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10

Han, Yong Hui, Da Qing Cang, and Wen Bin Dai. "Optimization of Co-Injection Desulfurization of Vanadium Bearing Hot Metal." Key Engineering Materials 744 (July 2017): 239–43. http://dx.doi.org/10.4028/www.scientific.net/kem.744.239.

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The desulphurization process parameters of vanadium bearing hot metal were optimized. It is found that it has the best desulfurization effect in 100t hot metal ladle, when the lance position is 280mm, the ratio of lime to Mg is 3:1, and the Mg injection rate is 9kg/min. The Si and Ti content of hot metal can increase the activity of S. With the increase of Si and Ti content of hot metal, the final sulfur content has a reduction trend. When the content of Si and Ti is lower than 0.35%, the final sulfur content of hot metal increases, and the hit rate decreases. The effect of hot metal temperature on desulfurization end point hit rate is obvious. When the hot metal temperature is between 1300~1320°C, the hit rate of desulfurization end point is higher. When the temperature is below 1300°C or above 1320°C, the sulfur content increases. After optimization of process parameters, the Mg and lime consumption per ton of hot iron are reduced by 0.11kg and 0.54kg, respectively, with the average hit rate of desulfurization end point increased by 22.6% and 10.7%, respectively.

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Дисертації з теми "Hot process":

1

Kennedy, Jonathan Ian. "Hot mill process parameters impacting on hot mill tertiary scale formation." Thesis, Swansea University, 2012. https://cronfa.swan.ac.uk/Record/cronfa42262.

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For high end steel applications surface quality is paramount to deliver a suitable product. A major cause of surface quality issues is from the formation of tertiary scale. The scale formation depends on numerous factors such as thermo-mechanical processing routes, chemical composition, thickness and rolls used. This thesis utilises a collection of data mining techniques to better understand the influence of Hot Mill process parameters on scale formation at Port Talbot Hot Strip Mill in South Wales. The dataset to which these data mining techniques were applied was carefully chosen to reduce process variation. There are several main factors that were considered to minimise this variability including time period, grade and gauge investigated. The following data mining techniques were chosen to investigate this dataset: Partial Least Squares (PLS); Logit Analysis; Principle Component Analysis (PCA); Multinomial Logistical Regression (MLR); Adaptive Neuro Inference Fuzzy Systems (ANFIS). The analysis indicated that the most significant variable for scale formation is the temperature entering the finishing mill. If the temperature is controlled on entering the finishing mill scale will not be formed. Values greater than 1070 °C for the average Roughing Mill and above 1050 °C for the average Crop Shear temperature are considered high, with values greater than this increasing the chance of scale formation. As the temperature increases more scale suppression measures are required to limit scale formation, with high temperatures more likely to generate a greater amount of scale even with fully functional scale suppression systems in place. Chemistry is also a significant factor in scale formation, with Phosphorus being the most significant of the chemistry variables. It is recommended that the chemistry specification for Phosphorus be limited to a maximum value of 0.015 % rather than 0.020 % to limit scale formation. Slabs with higher values should be treated with particular care when being processed through the Hot Mill to limit scale formation.

2

Omar, Fuad. "Hot embossing process parameters : simulation and experimental studies." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/51655/.

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Fabrication processes for the high volume production of parts with micro and nano scale features are very important in the global research and industry efforts to meet the increasing needs for device miniaturisation in numerous application areas. Processes for the replication of surface geometries are promising technologies that are capable to meet the demand of manufacturing products at a low cost and in high volume. Among these technologies, hot embossing is a process which relies on raising the temperature of a sheet of polymer up to its melting range and on pressing a heated master plate into the polymer for triggering a local flow of the material to fill the cavities to be replicated. This technique has attracted increased attention in recent years in particular due to the relatively simple set-up and low cost associated with its implementation in comparison to other replication techniques. The present work is concerned with investigating the process factors that influence hot embossing outcomes. In particularly, a detailed study of the process parameters’ effect on the cavity pressure, demoulding force and uniformity of the residual layer for different materials is conducted to analyse the further potential of this process. A review of the current state of the art on these topics reported in Chapter 2, is also used to assess the capability of this replication technology. Chapter 3 presents an experimental study on the effects of process parameters on pressure conditions in cavities when replicating parts in PMMA and ABS. To measure the pressure state of a polymer inside mould cavities, a condition monitoring system was implemented. Then, by employing a design of experiment approach, the iii pressure behaviour was studied as a function of different process conditions. In particular, the effects of three process parameters, embossing temperature and force and holding time, on the mould cavity pressure and the pressure distribution were investigated. In addition, using a simple analytical model, the minimum required embossing force to fill the cavities across the mould surface was calculated. The theoretical value obtained was then used to inform the design of the experiments. It was shown that cavity pressure and pressure distribution were dependent on both materials and processing conditions. The obtained results indicate that an increase in temperature and holding time reduced the pressure in the central and edge cavities of the mould and the pressure distribution while the opposite effect takes place when considering the embossing force. Also, it was observed that an increase of the embossing force has a positive effect on cavity filling but a negative influence for homogenous filling. In Chapter 4, a theoretical model was proposed to predict demoulding forces in hot embossing by providing a unified treatment of adhesion, friction and deformation phenomena that take place during demoulding of polymer microstructures. The close agreement between the predicted results and those measured experimentally suggests that the model successfully captures the relationship between mould design, feature sidewall, applied pressure, material properties, demoulding temperature and the resulting demoulding force. The theoretical results have been confirmed through comparisons with the demoulding experiments. The temperature at which the demoulding force is minimised depends on the geometry of the mould features along with the material properties of the mould and replica. The applied pressure has an important influence on the demoulding force iv as the increase in pressure augments the adhesion force due to changes in material dimensions and reduces the friction force due to resulting decrease in the thermal stress. Furthermore, the relationship between the residual layer uniformity and three process parameters was investigated in Chapter 5, using simulation and experimental studies when processing PMMA sheets. In particular, the characteristics of the residual layer thickness of embossed parts were analysed as a function of the moulding temperature, the embossing force and the holding time. Increasing the moulding temperature resulted in a reduction on the average residual layer thickness and on its non-uniformity. An increase in the embossing force led to a decrease in the homogeneity of the residual layer. Also, an improvement of the residual layer thickness uniformity was also observed when embossing with a longer holding time. The results of the conducted experimental and simulation studies were analysed to identify potential ways for improving the hot embossing process. Finally, in Chapter 6 the results and main findings from each of the investigations are summarised and further research directions are proposed.

3

Luginbuhl, Katharine. "Process characterization of a PMMA hot embossing system." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92196.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 157-158).
Microfluidics devices are important both for research use and medical application. To create these microfluidics devices, the hot embossing process is commonly used. In order to characterize this process to enable cycle to cycle control, a small-scale system was developed, using a hot embossing machine, taping machine, and functional tester previously created. Parts were moved between these machines with an Epson GlO SCARA robot, which provided the appropriate efficiency and accuracy. This system was able to produce embossed parts with a takt time of less than 135 seconds, and over 1000 of such parts were produced. The system was analyzed to determine potential sources of variance, considering both things that would alter the part and things that would alter the measurements. This enabled the system to be run in a state of statistical control, which in turn allowed for a designed experiment to be done on the system. This designed experiment determined that the forming temperature, forming force, forming time, as well as the square terms for the forming temperature and forming force and the cross-terms of forming force with forming temperature and forming time with forming temperature, were all statistically significant in the formation of parts. With this data, cycle-to-cycle control can be enabled in the future.
by Katharine Luginbuhl.
S.M.

4

Wang, Xifan. "Ideal Process Design Approach for Hot Metal Working." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1375222977.

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5

Barrera, Cardiel Gerardo. "Hot model simulation of the bottom blown steelmaking process." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63927.

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6

Li, Shimin. "Hot Tearing in Cast Aluminum Alloys: Measures and Effects of Process Variables." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-dissertations/203.

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Hot tearing is a common and severe defect encountered in alloy castings and perhaps the pivotal issue defining an alloy's castability. Once it occurs, the casting has to be repaired or scraped, resulting in significant loss. Over the years many theories and models have been proposed and accordingly many tests have been developed. Unfortunately many of the tests that have been proposed are qualitative in nature; meanwhile, many of the prediction models are not satisfactory as they lack quantitative information, data and knowledge base. The need exists for a reliable and robust quantitative test to evaluate/characterize hot tearing in cast alloys. This work focused on developing an advanced test method and using it to study hot tearing in cast aluminum alloys. The objectives were to: 1) develop a reliable experimental methodology/setup to quantitatively measure and characterize hot tearing; and 2) quantify the mechanistic contributions of the process variables and investigate their effects on hot tearing tendency. The team at MPI in USA and CANMET-MTL in Canada has collaborated and developed such a testing setup. It consists mainly of a constrained rod mold and the load/displacement and temperature measuring system, which gives quantitative, simultaneous measurements of the real-time contraction force/displacement and temperature during solidification of casting. The data provide information about hot tearing formation and solidification characteristics, from which their quantitative relations are derived. Quantitative information such as tensile coherency, incipient crack refilling, crack initiation and propagation can be obtained. The method proves to be repeatable and reliable and has been used for studying the effects of various parameters (mold temperature, pouring temperature and grain refinement) on hot tearing of different cast aluminum alloys. In scientific sense this method can be used to study and reveal the nature of the hot tearing, for industry practice it provides a tool for production control. Moreover, the quantitative data and fundamental knowledge gained in this thesis can be used for validating and improving the existing hot tearing models.

7

Favre, Julien. "Recrystallization of L-605 cobalt superalloy during hot-working process." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00876664.

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Co-20Cr-15W-10Ni alloy (L-605) is a cobalt-based superalloy combining high strength with keeping high ductility, biocompatible and corrosion resistant. It has been used successfully for heart valves for its chemical inertia, and this alloy is a good candidate for stent elaboration. Control of grain size distribution can lead to significant improvement of mechanical properties: in one hand grain refinement enhance the material strength, and on the other hand large grains provide the ductility necessary to avoid the rupture in use. Therefore, tailoring the grain size distribution is a promising way to adapt the mechanical properties to the targeted applications. The grain size can be properly controlled by dynamic recrystallization during the forging process. Therefore, the comprehension of the recrystallization mechanism and its dependence on forging parameters is a key point of microstructure design approach. The optimal conditions for the occurrence of dynamic recrystallization are determined, and correlation between microstructure evolution and mechanical behavior is investigated. Compression tests are carried out at high-temperature on Thermec-master Z and Gleeble forging devices, followed by gas or water quench. Mechanical behavior of the material at high temperature is analyzed in detail, and innovative methods are proposed to determine the metallurgical mechanisms at stake during the deformation process. Mechanical properties of the material after hot-working and annealing treatments are investigated. The grain growth kinetics of L-605 alloy is determined, and experimental results are compared with the static recrystallization process. Microstructures after hot deformation are evaluated using SEM-EBSD and TEM. Significant grain refinement occurs by dynamic recrystallization for high temperature and low strain rate (T≥1100 ◦ C, strain rate < 0.1s−1), and at high strain rate (strain rate > 10s−1). Dynamic recrystallization is discontinuous and takes place from the grain boundaries, leading to a necklace structure. The nucleation mechanism is most likely to be bulging from grain boundaries and twin boundaries. A new insight of the modeling of dynamic recrystallization taking as a starting point the experimental data is proposed. By combining the results from the mechanical behavior study and microstructure observation, the recrystallization at steady-state is thoroughly analyzed and provides the mobility of grain boundaries. The nucleation criterion for the bulging from grain boundaries is reformulated to a more general expression suitable for any initial grain size. Nucleation frequency can be deduced from experimental data at steady-state through modeling, and is extrapolated to any deformation condition. From this point, a complete analytical model of the dynamic recrystallization is established, and provides a fair prediction on the mechanical behavior and the microstructure evolution during the hot-working process.

8

Schuh, Amy Jeanne. "Monitoring and control system for hot air solder leveling process." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020101/.

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9

Fereshtehi-Saniee, Faramarz. "3-D simulation of the fullering process in hot forging." Thesis, University of Birmingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633094.

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Elongated parts make up a considerable percentage of forged components used in various industries. In many cases, their production by means of a multi-impression forging operation involves fullering and rolling processes. These are two types of open-die forging process, the main function of which is to properly distribute the metal in the longitudinal direction of the component. Several sets of empirical rules for fuller and roller die design have been proposed previously and have also been incorporated into CAD/CAM systems. Since in these processes the metal can flow freely in certain directions, there is no guarantee that the desired preform shape will be produced and some means of predicting this shape would be beneficial. During the initial stages of this project, various methods of metalworking analysis were reviewed. The model material technique and the finite-element (FE) method were selected for the analysis of the deformation during the fullering process. A gravity drop model hammer was designed and constructed for the physical simulations of the fullering process using plasticine as the model material. Ring tests were performed to find a suitable lubricant and compression tests were used to obtain the flow stress of the plasticine as a function of strain and strain rate. For the physical simulation of different types of the fullering process, a typical elongated forging component was used. These tests were performed using die shapes described as flat-flat and crowned-flat. The main features of deformation studied by the model tests were the distribution of deformation, variations of elongation and maximum sideways spread and the elongation achieved during each blow in each of the processes. The results were discussed, compared to each other and employed for the validation of the FE results. The fullering processes that were modelled physically were also simulated numerically using an elastic-plastic thermo-mechanical code (EPFEP3). Different FE models were developed to investigate the effects of mesh density on material flow. Separate sets of material properties, namely those of hot steel and plasticine, were employed in the simulations. For each set, separate FE analyses of ring compression tests were conducted to ensure that the appropriate friction condition was provided for the simulations of the fullering processes. The material flow during the fullering process, and the effects of various parameters influencing this, were investigated. To validate the results obtained from the FE simulations, they were correlated with the available experimental data as well as with the results obtained from physical modelling of the process. In most cases there was very good agreement. Also, to evaluate the empirical design rules for the forging component under consideration, the total elongation and the required minimum fuller width gained from different physical and FE simulations of various fullering processes were compared to the mass distribution requirement and to the suggestions made by some investigators. There was good agreement between various estimated fuller widths. However, it was found that to improve the amounts of total elongation, the geometries of the designed fuller dies should be modified. To avoid a trial and error method of die modification which has economical disadvantages, it was decided to employ the FE results gained from the first simulation of the process together with a numerical predictive approach. The effects of two important parameters which influence the total elongation, namely fuller gap and fuller length, were studied in the fullering process of a square bar with flat-flat dies. A method of fuller gap modification was introduced and extended to other types of fullering processes. Also, the effect of fuller length on longitudinal and transverse flow of metal was interpreted based on previous experimental observations. This investigation has also shown the feasibility of developing the current fuller CAD/ CAM system into an expert system.

10

Abu, Qdais Hani A. "Management of municipal solid waste composting process in hot climates." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242361.

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Книги з теми "Hot process":

1

Cloninger, Curt. Hot-Wiring Your Creative Process. Upper Saddle River: New Riders, 2007.

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2

Fereshteh-Saniee, Faramarz. 3-D simulation of the fullering process in hot forging. Birmingham: University of Birmingham, 1997.

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3

Hornsby, J. M. Hot-dip galvanizing: Guide to process selection and galvanizing practice. London: Intermediate Technology Publications, 1994.

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4

Rosindale, Ian J. Modelling the thermal behaviour of the metal injection system in the hot chamber pressure die casting process. Manchester: UMIST, 1997.

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5

Process, Technology Conference (8th 1988 Dearborn Mich ). The effect of microalloys on the hot working behavior of ferrous alloys: Proceedings of the 8th Process Technology Conference. Warrendale, Pa: Iron and Steel Society, 1989.

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6

Dimino, Ignazio. La sudicia commedia d'un processo "all'acqua calda". Sciacca: Domus mea, 1993.

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7

Grundmeijer, H. G. L. M., G. E. H. M. Rutten, and R. A. M. J. Damoiseaux, eds. Het geneeskundig proces. Houten: Bohn Stafleu van Loghum, 2016. http://dx.doi.org/10.1007/978-90-368-1092-0.

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8

Rutten, G. E. H. M., R. A. M. J. Damoiseaux, and T. C. olde Hartman, eds. Het geneeskundig proces. Houten: Bohn Stafleu van Loghum, 2019. http://dx.doi.org/10.1007/978-90-368-2261-9.

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9

Kerstens, J. A. M., J. H. J. de Jong, M. Vermeulen, and E. M. Sesink. Het verpleegkundig proces. Houten: Bohn Stafleu van Loghum, 2013. http://dx.doi.org/10.1007/978-90-368-0415-8.

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10

Baars, A. Het proces Sneevliet, 1917. Leiden: KITLV, 1991.

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Частини книг з теми "Hot process":

1

Gutierrez, Isabel, and Amaia Iza-Mendia. "Process: Hot Workability." In Duplex Stainless Steels, 1–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118557990.ch1.

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2

Hu, Ping, Ning Ma, Li-zhong Liu, and Yi-Guo Zhu. "Hot Forming Process." In Springer Series in Advanced Manufacturing, 35–45. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4099-3_3.

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3

Nishihara, M. "Hot Hydrostatic Extrusion Process." In Hydrostatic Extrusion, 139–63. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4954-6_7.

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4

Popiolek, Monika. "Terminology management within a translation quality assurance process." In Handbook of Terminology, 341–59. Amsterdam: John Benjamins Publishing Company, 2015. http://dx.doi.org/10.1075/hot.1.18ter6.

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5

Lampa, Aljoscha, and Udo Fritsching. "Hot Gas Atomization of Complex Liquids for Powder Production." In Process-Spray, 751–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32370-1_19.

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6

Gryczke, Andreas. "Hot-Melt Extrusion Process Design Using Process Analytical Technology." In AAPS Advances in the Pharmaceutical Sciences Series, 397–431. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8432-5_16.

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7

Patil, R. T., and Dattatreya M. Kadam. "Hot Air Drying Design: Fluidized Bed Drying." In Handbook of Food Process Design, 542–77. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781444398274.ch20.

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8

Ahmed, Jasim, U. S. Shivhare, and Rajib Ul Alam Uzzal. "Hot Air Drying Design: Tray and Tunnel Dryer." In Handbook of Food Process Design, 510–41. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781444398274.ch19.

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Altan, T. "Process Simulation of Hot Die Forging Processes." In Advanced Technology of Plasticity 1987, 1021–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-11046-1_44.

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Heil, Chris, and Jeffrey Hirsch. "Improved Process Understanding and Control of a Hot-Melt Extrusion Process with near-Infrared Spectroscopy." In Hot-Melt Extrusion: Pharmaceutical Applications, 333–53. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9780470711415.ch16.

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Тези доповідей конференцій з теми "Hot process":

1

Nurminen, Janne, Jouko Riihimäki, Jonne Näkki, and Petri Vuoristo. "Hot-wire cladding process studies." In ICALEO® 2007: 26th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2007. http://dx.doi.org/10.2351/1.5061023.

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2

"HIP Process of a Valve Body to Near-Net-Shape using Grade 91 Powder." In Hot Isostatic Pressing. Materials Research Forum LLC, 2019. http://dx.doi.org/10.21741/9781644900031-8.

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3

Smith, Philip E., Que-Tsang Fang, and Xin Wu. "On Hot Metal Gas Forming Process." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43623.

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Анотація:

Hot Metal Gas Forming (HMGF) is a new metal forming process jointly developed by 15 automotive/aerospace companies/suppliers and one university under NIST-Advanced Technology Program [1, 2]. The primary goals of this program are (1) to achieve enhanced formability for automotive steels and aluminum alloys at high speeds, and (2) to reduce manufacturing cost. The technical approach is to develop a gas forming process that forms tubular components at elevated temperatures inside ceramic dies. During the forming, 1) a tubular workpiece is placed into the ceramic die cavity, then is rapidly heated to above 0.6Tm (melting temperature in K) by a set of induction coils that are embedded behind the ceramic die outer surfaces; 2) The two tube ends are sealed and a gas pressure is applied inside the bube; and 3) The metal fill the die cavity under combined internal gas pressure and optional axial feeding. After forming the workpiece is transferred to a cooling station for possible on-line heat treatment. For many steels and heat-treatable aluminum alloys the mechanical properties can be improved through controlled cooling rate after forming. In this presentation, the results on the elevated-temperature tensile behaviors and formability of several commonly used automotive aluminum alloys and steels will be presented. The microstructural evolution and its effect on the formability and post-forming properties will also be discussed. Two types of tube in-die forming 0processes have been studied: (1)tube expansion from 2 inche to 3 inch in diameter; (2) tube forming from round to squared sections. Based on laboratory that can perform continuous operation at a cycle time less than 30 seconds. Current activities in implementation of this new metal forming method for manufacturing vehicle chassis components will be described.

4

Liu, P. X., H. C. Li, and Y. S. Zhang. "Research on Hot Blanking Process for Hot Forming of Press Hardened Steel." In 4th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU2018). WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813277984_0051.

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5

Yılmaz, Ahmet, and Tuğçe Turan Abi. "HYBRID QUENCHING IN HOT STAMPING PROTOTYPE PROCESS." In 4th International Conference on Modern Approaches in Science, Technology & Engineering. Acavent, 2019. http://dx.doi.org/10.33422/4ste.2019.02.19.

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6

Lee, Sung-Keun, Hyun Sup Lee, Seung S. Lee, and Tai Hun Kwon. "Microlens Fabrication by the Modified LIGA Process and Hot Embossing Process." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33285.

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Microlens and microlens arrays is realized using a novel fabrication technology based on the exposure of a resist, usually PMMA, to deep X-rays and subsequent thermal treatment. The fabrication technology is very simple and produces microlenses and microlens arrays with good surface roughness (less than 1 nm). The molecular weight and glass transition temperature of PMMA is reduced when it is irradiated with deep X-rays. The microlenses were produced through the effects of volume change, surface tension, and reflow during thermal treatment of irradiated PMMA. Microlenses were produced with diameters ranging from 30 to 1500 μm. Moreover, fabrication of the microlens through the hot embossing process is studied based upon a microlens mold insert fabricated by the modified LIGA process. A hot embossing machine is designed and manufactured. The hot embossing process follows steps of heating a mold to desired temperature, embossing a mold insert on substrate, cooling the mold to deembossing temperature, and deembossing.

7

"Is NMOSFET Hot Carrier Lifetime Degraded By Charging Damage?" In 2nd International Symposium on Plasma Process-Induced Damage. IEEE, 1997. http://dx.doi.org/10.1109/ppid.1997.596737.

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Watson, Steven M., N. Olson, R. P. Dalley, W. J. Bone, Robert T. Kroutil, Kenneth C. Herr, Jeff L. Hall, et al. "Atmospheric properties measurements and data collection from a hot-air balloon." In Optical Sensing for Environmental and Process Monitoring, edited by Joseph Leonelli, Dennis K. Killinger, William Vaughan, and Michael G. Yost. SPIE, 1995. http://dx.doi.org/10.1117/12.205575.

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Chen, Li, Lixin Tang, and Rui Luo. "Differential evolution algorithm for hot rolling process optimization." In 2009 IEEE International Conference on Automation and Logistics (ICAL). IEEE, 2009. http://dx.doi.org/10.1109/ical.2009.5262647.

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10

Bageant, Maia R., and David E. Hardt. "Measurement and Process Control in Precision Hot Embossing." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65788.

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Microfluidic technologies hold a great deal of promise in advancing the medical field, but transitioning them from research to commercial production has proven problematic. We propose precision hot embossing as a process to produce high volumes of devices with low capital cost and a high degree of flexibility. Hot embossing has not been widely applied to precision forming of hard polymers at viable production rates. To this end we have developed experimental equipment capable of maintaining the necessary precision in forming parameters while minimizing cycle time. In addition, since equipment precision alone does not guarantee consistent product quality, our work also focuses on real-time sensing and diagnosis of the process. This paper covers both the basic details for a novel embossing machine, and the utilization of the force and displacement data acquired during the embossing cycle to diagnose the state of the material and process. The precision necessary in both the forming machine and the instrumentation will be covered in detail. It will be shown that variation in the material properties (e.g. thickness, glass transition temperature) as well as the degree of bulk deformation of the substrate can be detected from these measurements. If these data are correlated with subsequent downstream functional tests, a total measure of quality may be determined and used to apply closed-loop cycle-to-cycle control to the entire process. By incorporating automation and specialized precision equipment into a tabletop “microfactory” setting, we aim to demonstrate a high degree of process control and disturbance rejection for the process of hot embossing as applied at the micron scale.

Звіти організацій з теми "Hot process":

1

Lafreniere, Philip Leo, James Robert Tutt, Michael Lynn Fugate, and Brian P. Key. Modeling of Pyroprocessing Hot Cell for Process Monitoring Evaluation. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1566095.

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2

Bergstrom, Mary F., and William McNeill. Hot Gas Decontamination Process Field Demonstration Site Selection Report. Fort Belvoir, VA: Defense Technical Information Center, September 1988. http://dx.doi.org/10.21236/ada245367.

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3

Choi, Kyoo Sil, Chao Wang, Curt A. Lavender, and Vineet V. Joshi. Carbide Particle Redistribution in U10Mo Alloy during Hot Rolling Process. Office of Scientific and Technical Information (OSTI), December 2018. http://dx.doi.org/10.2172/1489839.

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4

Howden, G. F., D. L. Banning, D. A. Dodd, D. A. Smith, P. F. Stevens, R. I. Hansen, and B. A. Reynolds. TWRS tank waste pretreatment process development hot test siting report. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/45595.

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5

Heard, F. J. Thermal hydraulic feasibility assessment of the hot conditioning system and process. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/658943.

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6

Barnes, G. A. In-process weld sampling during hot end welds of type W overpacks. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/10148532.

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Leonard, Hugh R., and Jr. Handling the Hot Potato: Evolution and Analysis of the Base Closing Decision Process. Fort Belvoir, VA: Defense Technical Information Center, April 1992. http://dx.doi.org/10.21236/ada262623.

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Gangwal, S. K., T. M. Paar, and W. J. McMichael. Integration and testing of hot desulfurization and entrained-flow gasification for power generation systems. Phase 2, Process optimization: Volume 3, Effect/fate of chlorides in the zinc titanate hot-gas desulfurization process. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/10130171.

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Higgins, R. J., W. Ji, M. J. Connors, J. F. Jones, and R. L. Goldsmith. A regenerable sorbent injection/filtration process for H{sub 2}S removal from hot gas. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/446320.

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MITCHELL, GERRY W., and DANIEL J. ROMERO. Hot Cell Facility Criticality Safety Assessment for Storage of Medical Isotope Targets and Process Waste. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/782597.

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