Design of base pressing die for hydraulic core ejector rod driving side core pulling action
Journal of Henan Mechanical and Electrical College, hydraulic machine, ejector rod driving side core pulling action, original Hong Ling Ren Aimei 21, Henan Mechanical and Electrical College, Department of Mechanical Engineering; 2 Henan Xinfei Electric Co., Ltd., Henan Xinxiang 453, 2 abstract introduced the base pressing mold The characteristic and action process of the plum blossoms pointed out the difference in structure between the pressing die and the general pressing die, that is, the side core pulling and resetting action of the bending pin are all moved by the hydraulic machine ejector rod, the side core pulling and the topping system There is a sequential relationship between the pieces, and there is a relationship between the side core reset and the feed suppression.
1 workpiece process analysis material, suitable for press molding. There is no special requirement for the internal shape of the workpiece. Therefore, the workpiece is made of 5-level precision and low precision. The workpiece is a rectangular step, so the shape of the mold cavity should be rectangular, and there are 4 small holes on the left side. Core mechanism.
2 Fengwu with structural mold assembly 2. As can be seen from the assembly, the design of the pressing mold focuses on the following aspects. According to the characteristics of the workpiece, the vertical pressing direction of the horizontal parting surface is selected for the press forming. Fixed stamping die.
The upper and lower molds of the mold are combined with a semi-overflow molding structure.
121 formed core is separated from the upper punch, threaded with the top rod, and also has the ejector part. The molding of the plastic 4 is carried out at a high temperature, although the polymerization reaction is to release a certain heat, but to make The reaction must be preheated at the normal rate. A heating plate is arranged above and below the pressing die, and an electric heating rod is installed for heating.
According to the calculation of the forming pressure, the mold is mounted on the human 7145 hydraulic press during the press forming, and the pressure block is applied between the upper and lower molds on the left and right sides of the mold to withstand the excess pressure.
The guide post guide sleeve is reliably guided by the upper mold lower return stroke and the movement of the die ejector plate and the ejector fixed plate.
Brief introduction of the original Hong Ling 1974, female, Huixian City, Henan Province, Hefei University of Technology, Department of Materials Science and Engineering, teaching assistant, engaged in mold design and manufacturing side 1 board; 2 support plate; buckle bending pin; 415 heating plate; Baffle; 6 screws; 7 baffles; 8 springs; 9 sliders; 10, 1!
咕芯一芯13定æ¿;1 vote 1 fixed plate; 13 pieces, 1 piece; 14 upper plate 1 convex mold guide column; 21 lower core 2 key block 22 rod 2 guide column 2 top out the same record 挎 2 guide Set 25 out of the board 2 studs; 28 tail shaft 3 mold action process to add plastic into the feeding chamber. At the same time, the heating element is heated by the electric heating rod of the lower heating plate. The upper mold goes down. Said to make a piece, the pressing is completed, the upper die is up, the hydraulic machine ejector rod pushes the die ejector plate 26 to ascend the fixed plate 24 upward, so that the bending pin drives the oblique slider to the left to move the segment distance, and the side core is extracted. The hydraulic ejector rod continues to move upwards, and the ejector plate 24 hits the ram 22 and pushes it upward. The parts are ejected to complete the pressing of the parts. After the secondary pressing is completed, the elastic force of the lower core 20 and the ejector spring 8 pushes the oblique slider to reset the side core first, then adds the plastic, and the upper mold descends for the next pressing.
4 Mold Features 4.1 The press mold is matched with the upper and lower molds. The semi-overflow mold structure is used to provide a feeding chamber with a larger diameter of the broken cavity than the cavity. The convex and concave molds are in a dynamic fit. It has a guiding effect, and there is an annular pressing surface at the boundary between the feeding chamber and the cavity. This structure can ensure the high dimensional accuracy of the workpiece.
4.2 The bending pin side core pulling mechanism The core pulling and bending pin resetting is driven by the hydraulic machine ejector rod in the plastic mold. The general lateral core pulling or parting mechanism is installed in the upper mold part, and is driven by the opening and closing mold action. However, in consideration of the pressing, the mold firstly adds the plastic powder into the mold cavity and the feeding chamber, and then uses the clamping action to drive the side core to be reset, and the plastic is hidden in the hole of the concave mold and the æ» core.
decline. Therefore, according to the structure shown, the bending pin is fixed on the ejector fixing plate, and the core pulling and resetting actions are all driven by the hydraulic machine ejector rod, and the bending pin side is close to the sliding block. There is a gap on the other side so that the vertical part of the bending pin can freely move up and down. When the mold is working, the hydraulic machine ejector rod acts first, so that the side core is first reset, and then the plastic powder is added for pressing, which effectively avoids the occurrence of side core wear.
4.3 The ejection action of the ejector pin 22 should be ensured after the drawing of the core, and the side core should be pulled out before the pressing is completed. The inclined block moves at least in the horizontal direction, such as the working length of the side core. The part can be ejected when the wall is thick. Here, the inclination angle of the bending pin is 72. The height at which the bending pin rises vertically is = 472 = 1233. That is, the top plate is lifted out of the solid plate by 12.3. The mold is designed to draw the side core and then contact the ejector. Pull out the parts.
4.4 The tail shaft is connected to the ejector plate of the stamper by a shoulder to connect the tail shaft so that the tail shaft can rotate in the ejector plate. When installing the mold, screw the thread on the head into the threaded hole in the center of the hydraulic ejector rod. With this configuration, the ejector rod of the hydraulic machine acts not only when it is ejected. Moreover, the ejector plate of the stamper can be pulled back during the return stroke, and the stamper does not need to be provided with a return lever.
The 4 points are the characteristics of the pressing mold, and it is also the place where the wood 1 mold is superior to the ordinary pressing mold. Specifically, it is a good solution to the problem of easy to store plastic powder in the core hole of the pressing mold, and 3 effectively solves the problem of ejecting the core after the core is first drawn.
Wood mold + foot 0 pin side force. It is a wearing part. Need to be replaced frequently.
1 Cao Hong. Zhao Zhong Plastic 1., 1 Art 1 set 1. Beijing + rape 2, go out; to the soil. 1993.
2 plastic, with technical manual, floor. Plastics 1 1 technical manual Beijing Machine Magic Small Press. Sand
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