scholarly journals Pressure Lubricated Deep Drawing : 5th Report, The Sub-shop-scale Experiments Using a Hydraulic Press Equipment

1964 ◽  
Vol 30 (214) ◽  
pp. 720-725 ◽  
Author(s):  
Yasuo KASUGA ◽  
Sigeaki TUTUMI
2000 ◽  
Author(s):  
Peter J. Ulintz

Abstract Combining today’s computer technology with new generation, multiple-action, hydraulic press equipment, has created a new process opportunity in deep drawing. Integrating these modern machine and computer controls with innovative programming and tool designs, has led to the development of a production process that produces a double reverse-drawn, cylindrical shell that significantly exceeds traditional Limiting Drawing Ratios (LDR). The method used to produce these shells employs a recently developed technique, herein referred to as Tractive Kinematic Regression, or more simply, the TKR process. The TKR process promotes material flow by “feeding” material into the die cavity, as opposed to the punch having to “draw” or “pull” in the flange. This is accomplished through the use of concurrent - but unequal - force and motion curves of a forward moving punch and a regressing (reverse moving) die ring. The computer controlled kinematics, forces and motion curves resulted in less material straining and thereby, provided increased formability and improved LDR.


2012 ◽  
Vol 472-475 ◽  
pp. 645-648
Author(s):  
Ming Ming Ding ◽  
Yong Huang ◽  
Yu Qing Shi

On the basses of analyzing the defects of variable blank holder force hydraulic press on construction and its rigid being not enough,the realization of designing method,working principle,hydraulic and system for ne controlling w type upper multi-point deep drawing with variable blank—holding force controlled by computer was introduced.In order to verify the effect of application of this set up,the testing results of deep drawing a rectangular box and a cylindrical cup formed component was presented. The results show that the equipment has low cost, general in using and optimal efficient of controlling.


2011 ◽  
Vol 690 ◽  
pp. 302-305 ◽  
Author(s):  
Lennart Stutz ◽  
Julian Quade ◽  
Michael Dahms ◽  
Dietmar Letzig ◽  
Karl Ulrich Kainer

Magnesium alloy sheets bear significant potential in replacing conventional materials such as aluminium and steels in ultra lightweight designs. High specific strength and stiffness, combined with the lowest density of all structural metals make magnesium alloy sheets candidates to face the challenges of reducing vessel weight in the transportation industry and thus, green house gas emissions. For forming components from sheet metal, deep drawing is a well established and commonly applied process. Due to the limited formability of magnesium sheets at room temperature, deep drawing processes have to be conducted at elevated temperatures. In the present study, hot deep drawing experiments on an industrial scale hydraulic press were successfully conducted. Forming was done at moderately low temperatures from 150°C to 250°C. Sheets of the magnesium alloy AZ31B (Mg-3Al-1Zn-Mn) were drawn to symmetrical cups according to Swift. For AZ31, distinct basal type textures are formed during hot rolling. The influence of texture on earing is displayed. The microstructural evolution of the material is dominated by the formation of twins and dynamic recrystallisation. By optimising the process, a drawing ratio of 2.9 was achieved for AZ31 sheet, outperforming conventional materials at ambient temperature.


2020 ◽  
Vol 13 (2) ◽  
pp. 378
Author(s):  
Ismael Marasabessy ◽  
Fien Sudirjo ◽  
Syahibul K. Hamid ◽  
Yuni Irmawaty

The business group which is become the target of this activity is a group of processing and selling enbal (cassava) in Ibra village, Southeast Maluku regency. This group has been producing for more than 10 years but there are still many shortage, especially in the way of press along with the sanitize and hygiene of the production process. The purpose of this activity is to increase the efficiency in production process by applying screw press equipment and improving sanitation and hygiene in its production. The method of implementing activities uses discussion and training techniques. The activity is carried out in three stages, firstly survey on condition and discussion with partners relates to the conditions of producing pressing enbal, secondly the manufacture of pressing tools, third is the application of pressing tools in production activities of partners. The results of the activity showed that the screw press was able to produce enough water of enbal / grated cassava so that it is drier than the traditional method. Press time becomes faster which only 12-15 minutes, whereas in the traditional way it takes 14-24 hours. The content of enbal’s water decreases very low, reaching 5-7%, the sanitation becomes better because the juice is no longer stagnant on the ground but is collected in a bucket, and the use of pressing tools is very practical. Likewise the HCN level is very low, less than 3mg / kg so the product is very safe for consumption. This screw press is very helpful in the efficiency of the production process of plate enbal (cassava plates) which is cleaner and healthier.


2018 ◽  
Vol 920 ◽  
pp. 64-69 ◽  
Author(s):  
Yasunori Harada ◽  
Hiroto Ono ◽  
Yuki Nishikubo

Cladding is the bonding together of dissimilar metals. One of clad products is the titanium clad steel sheet. It is effective to cover with pure titanium sheet to improve the corrosion resistance of the steel sheet. Titanium clad steel sheets are often achieved by rolling sheets together under high pressure. In the current study, the blank comprising three laminar non-bonded sheets, such as the titanium/steel/titanium sheet, is arranged in the die. The formability of pure titanium clad sheet by multistage deep drawing was investigated to enhance corrosion resistance of steel cup. In the experiment, the blanks were pure titanium sheets JIS1-TP270, JIS2-TP340, ultralow-carbon steel SPCC, and stainless steel SUS316L. The initial thickness of the sheet was 0.2 to 0.5 mm in thickness. The blank diameter was 70 mm. The blanks are merely adjacent sheet; however, not joined with each other. In the deep drawing process, a hydraulic press was used in the experiment and the forming speed for the press was about 10 mm/min. The lubricant used was the solid powders of molybdenum disulfide. For the prevention, pure titanium blank was treated by oxide coating. The conditions of heat treatment were annealed at 973 K for 3.6 ks to 7.2 ks. By oxide coating, the titanium sheet has sufficient ability in preventing the seizure in multistage deep drawing. The drawn cups of the three-layer laminated sheet were formed. The seizure did not cause. The oxidatively-treated titanium sheets have sufficient ability in preventing the seizure. In addition, the clad cups until 6th stage were formed by multistage deep drawing. Long clad cups were successfully formed in multistage deep drawing process.


2012 ◽  
Vol 522 ◽  
pp. 546-551
Author(s):  
Jiang Han ◽  
Hai Jin Huang ◽  
Lian Xia ◽  
Hua Zhai

The application, which the intelligence is used in the fault diagnosis, is the main direction of research currently, especially in the fault diagnosis of large mechanical equipment. In order to improve hydraulic system failure diagnosis of high-speed deep drawing hydraulic press, reduce the efficiency and accuracy of difficulty diagnostic staff. By using rough sets theory combining neural network and the method of large NC hydraulic press, hydraulic system fault diagnosis of diagnosis. This paper established based on rough set - neural network fault diagnosis model, and the following hydraulic cushion hydraulic system as an example, the diagnosis in establishing the fault table based on the rough set theory to fault table attribute reduction and generating rules, will rule input to the BP neural network was trained learning. Get in neural network after the test data repository and simulation. Test results show that the method for the diagnosis of high-speed deep drawing hydraulic press hydraulic system fault is effective.


Author(s):  
О.В. Чибирев ◽  
О.А. Куницкая ◽  
Д.А. Ильюшенко

Статья посвящена исследованию зависимости жесткости опилок от их фракции и степени уплотнения при прессовании на гидравлическом прессе. Для экспериментов использовали опилки, полученные при пилении древесины сосны дисковой и цепной пилой. Экспериментальный материал предварительно сепарировали при помощи колонки сит так, чтобы получить пробы с различной фракцией: 5-10 мм, 3-5 мм, 2-3 мм, 0,5-2 мм, <0,5 мм (поддон). Влажность опилок составляла 7-10%. Прессование экспериментальных проб производили на гидравлическом прессе RUF BP-600 при давлении прессования до 150 МПа. Всего было выполнено 15 опытных запрессовок, по 3 повторения для каждой фракции опилок. Установлено, что в общем виде экспериментальные зависимости потребного давления прессования опилок от плотности брикетов можно описать степенными функциями. Также на основании экспериментальных данных установлено, что модуль деформации сосновых опилок изменяется в пределах от 0,5 до 5 ГПа и заметно зависит как от плотности, так и от фракции прессуемого материала. Экспериментально установлено, что при равном давлении легче, по сравнению с прочими фракциями, прессуются опилки фракцией 3-5 мм. Оптимальная для прессования фракция опилок в проведенных опытах составила 3,7 мм. При фракции крупнее 7 мм жесткость материала резко возрастает, в связи с этим процесс прессования усложняется. В заключение освещаются перспективные направления дальнейших экспериментальных исследований, приводятся рекомендации по структуре планов последующих экспериментов. The article focuses on the dependence between stiffness of pine sawdust, its faction and compaction degree in the process of briquetting under hydraulic press. Experimental samples came from sawdust produced with sawing of pine wood with circular saw and a chainsaw. The experimental material was separated using a column of sieves in order to obtain samples of various fractions: 5-10 mm 3-5 mm 2-3 mm, 0.5-2 mm, <0.5 mm (on the pan). The sawdust had 7-10% humidity. Briquetting of the experimental samples was performed with RUF BP-600 hydraulic press at a pressure of 150 MPa. (15 experimental samples total, 3 reps for each sawdust fraction). The results establish that in general the experimental dependence between required compaction pressure and the briquettes density appears as a power functions. Based on experimental data, research sets that the deformation modulus of pine sawdust varies from 0.5 to 5 GPa and significantly depends on the density and fractions of the molded material. The paper establishes that 3-5 mm fraction of sawdust is easier compacted compared to other fractions. Optimal fraction of sawdust in the experiments was 3.7 mm. Sawdust fraction over 7 mm has sharply increased stiffness, thereby pressing process becomes complicated. In conclusion, the article highlights prospective topics for further experimental research, providing guidance on the structure of plans for subsequent experiments.


2007 ◽  
Vol 546-549 ◽  
pp. 285-288
Author(s):  
Qun Feng Chang ◽  
Ying Hong Peng ◽  
Da Yong Li ◽  
Xiao Qin Zeng

A process of warm deep drawing of magnesium alloy with variable blank holder force has been presented in this study. A hydraulic press that can realize adjustable blank holder forces was developed and its working principle and control system introduced. A warm deep drawing mould was fixed and warm deep drawing experiments are conducted on the hydraulic press. Different variation schemes of the blank holder force with the stroke of the punch was tested, and compared with experiment results. The experimental results show that adopting the variable blank holder force technique can remarkably improve the forming performance and decrease the reduction ratio of thickness from 15.21% to 12.35%. It is further demonstrated that the suitable blank holder force variation scheme is an inverted V curve with the punch stroke.


Sign in / Sign up

Export Citation Format

Share Document