Hydraulic and pneumatic and sealed normal pressure side force hydraulic deep drawing die design The blanking force in the process of Qin sprinkling deep remains unchanged, which not only makes hydroforming easier to achieve on single-action presses. Moreover, it is possible to achieve the purpose of force-controlling the edge-pressing effect. When hydraulic deep drawing is used, the liquid pool which generates the liquid pressure is disposed on the side of the concave mold, so this opening method is also called the counter-hydraulic drawing. The action of the liquid in the liquid pressure can make the slab adhere to the punch, the friction effect of the large punch, and can play the role of forced lubrication between the plate and the die, so the limit deformation can be significantly improved. The degree of this forming method is also referred to as forced lubrication drawing.
Due to the characteristics of hydraulic deep drawing, the beading ring should adopt a rigid structure or require a large blanking force at the beginning of drawing. Therefore, such forming is carried out on a double-acting press, but sometimes in order to save costs, the structure of the bead ring can be reasonably designed, and it can also be completed on a single-action press. For the mold on the single-action press, there is a pressure edge effect. Not conducive to the operation of production. Low disadvantages.
Due to the high requirements on the die structure of the equipment, the hydraulic deep drawing is subject to a large limitation.
The structure can be installed on a single-action press, which will be greatly changed at the initial stage of drawing, so as to meet the requirements of the helium deep drawing forming conditions. 1 The structure of the hydraulic drawing die is used for the hydraulic pressure on the single-action hydraulic press. When the drawing structure of the deep drawing is deep, the pressure in the liquid pool can be naturally pressurized during the drawing process, which not only achieves the purpose of forced lubrication, but also enables the deformed blank to be closely attached to the punch and has a large friction effect. This forming method can increase the drawing forming limit and form a relatively complicated part.
It is noted that the binder ring 2 is screwed to the die so that the secondary binder ring is re-detached each time it is formed, so the production rate is low.
According to the hydraulic deep drawing special! It is required to generate a large blanking force at the beginning of drawing to establish the pressure in the liquid pool. However, with the ordinary pressing method, the blanking force at the initial stage of drawing is the smallest. As the drawing process progresses, the blanking force gradually increases, so the hydraulic drawing cannot be satisfied. In order to make the hydraulic drawing easy to be in the single acting pressure On-board, you need to find a new method of crimping.
2 Normal pressure side force design principle In the ordinary drawing die design, in order to make the blanking force more in line with the requirements of the drawing process, the author first proposed the design method of the atmospheric pressure side force 2, and later carried out the pressure edge structure. Improvement 35, up to now, the design principle of the constant force edge has been used in many literatures. This method uses yellow rubber as an elastic component to achieve constant force crimping. At the beginning of the drawing, the blanking force reaches the maximum value of the design. In the subsequent 1 punch 2 pressing, 3 die 4 lower mold 51 force to twist the valve 1 bottom plate; 2 ejector; 3 pressing material Plate; + upper plate 5 limit stare 6 punch 7 die 2 constant pressure side pull, the die blanking force remains unchanged during the die drawing process.
It is not shown that it is transmitted to the ram 25 through the bottom plate 1 and then transmitted to the blank through the spring of the lower pressing plate 3 and the upper pressing plate 4. When the upper die continues to descend, the spring is compressed, and the limit staring 5 is in contact with the die 7. When the blanking force reaches the maximum, when the drawing is continued, the force acting on the slab is kept constant because the bombing cost is high and the influence of the thickness variation of the slab is ignored.
3 atmospheric pressure side hydraulic deep drawing die design 1 bottom plate; 2 punch fixed plate; 3 top rod; 4 rubber 5 single spring; 6 upper pressure plate; 7 lower pressure plate 8 limit mark; 9 punch; The die can be seen from the above analysis. The constant force crimping method can make the blanking force reach the maximum ä¸ä¹… soon after the drawing starts, and the pair meets the requirement of the blanking force on the blanking force. Therefore, the normal force can be used. The crimping structure is used in the design of the mold for hydraulic deep drawing.
In order to make the mold compact, the general drawing die is mostly in the form of flip-chip. For hydraulic drawing, the formal structure is used, so that the form of the crimping structure will be slightly changed. That is to say, the elastic component rubber or spring placed in the bottom of the machine in the flip-chip structure is moved to the top, but the hydraulic drawing die is mostly carried on the hydraulic machine, and the distance between the stroke and the opening is much larger than that of the ordinary crank press, and the installation space is the same. There will be no problems. 3. When the upper die portion descends, the lower press plate 7 first comes into contact with the blank on the die 10, and the blanking force is transmitted from the rubber 4 to the blank through the upper press plate 6 spring 5 and the lower press plate 7 When the die continues to descend, the spring 5 is compressed, and the limit mark 8 is in contact with the die 10. Therefore, the blanking force is maximized and continues to be deepened. The spring 5, the service + goods, so that the force on the board can maintain the positioning.
4 Conclusions The design principle of constant pressure side force is applied to the design of hydraulic drawing die. The new blanking method is more suitable for the requirement of the clamping force of the liquid helium deep drawing. This structure can be used to make the crimping during the drawing process. The force is kept constant, so that hydroforming is easy to achieve on a single-action press.
If the structural parameters of the crimping part are changed, the blanking force will change. Therefore, the blanking force can be determined according to the actual situation, and the purpose of controlling the blanking effect by the blanking force can be achieved. The characteristics of hydraulic forming have certain practical significance.
I Li Tianyou. Die book. Beijing Mechanical Industry Press, 198866 2 Yang Lianfa. A mechanical constant force crimping transposition design. Guilin Electronics Industry 3 Peng Gengxin. Liu Hongshi, Liu Yuenan and so on. Variable force blanking die design. Mold worker i.l99K92021 4 Hu Jianguo. The application of rubber in stamping die design. Mold technology end 1998 5 Wang Dongzhe. Lu Dong. He Dannong and so on. The control of the blank holder force in sheet metal forming 6 Wang Dongzhe. He Dannong. Bright and so on. Blanking force optimization control research. Mold technician Qin Yuji. Male, School of Mechanical Engineering, Yanshan University, Qinhuangdao.
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