Cold punching die with smooth cross section

Abstract

The utility model belongs to the technical field of cold punching dies, and particularly relates to a cold punching die with a smooth cross section, which comprises a stripping limiting column, materials are placed in the stripping limiting column, an upsetting-extruding male die is slidably connected in the upper end of the stripping limiting column, and the upsetting-extruding male die is in contact with the materials. And an upsetting-extruding female die is slidably connected to the interior of the lower end of the stripping limiting column and makes contact with materials, an ejector rod is fixedly connected to the bottom of the upsetting-extruding female die, a first spring is fixedly connected to the bottom of the ejector rod, and a base is fixedly connected to the bottom of the first spring. By adopting the mode of upsetting-extruding first and then fine blanking, the stress of the die is reduced, meanwhile, the bright zone of the outer contour is greater than 85% of the thickness of the material, the matching performance of the product is greatly improved, the smoothness of the outer contour and the effect of the bright zone enable the static iron core to move more smoothly in the magnetic conduction cylinder, and the small collapse angle ensures that the static iron core and the movable iron core have enough attraction area.

Description

Technical Field

[0001] The utility model relates to the technical field of cold stamping dies, and particularly relates to a cold stamping die with a smooth cross section. Background Art

[0002] In the early stage, the rotary parts were processed by turning process. In order to reduce the product cost, stamping dies were used for forming. However, due to the large material thickness, it was difficult to achieve a small collapse angle and a sufficient bright band. If precision stamping equipment was used for production, the equipment value was more than ten million, and the cost was relatively high. In addition, a bulging upsetting extrusion structure was adopted to extrude 2 / 3 of the material thickness, so that the double action of the upsetting punch and the inner limit post of the die extruded and filled the collapse angle of the upsetting forcefully. In the next process step, the remaining 1 / 3 of the material was blanked and cut. Since the blanking die was designed to enable the already upset part to be smoothly inserted, the die size was usually 0.02 - 0.03 mm larger than the size of the already upset part of the product on one side, resulting in a double-layer step on the product after blanking, thus affecting the finished product quality and leading to poor assembly. Therefore, improvement is needed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a cold stamping die with a smooth cross section, which solves the problem that the existing cold stamping die is prone to double-layer steps after blanking the product, thus affecting the finished product quality and leading to poor assembly.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a cold stamping die with a smooth cross section, including a stripping limit post, wherein a material is placed inside the stripping limit post. A upsetting punch is slidably connected inside the upper end of the stripping limit post and contacts with the material. A upsetting die is slidably connected inside the lower end of the stripping limit post and contacts with the material. A ejector rod is fixedly connected to the bottom of the upsetting die. A first spring is fixedly connected to the bottom of the ejector rod. A base is fixedly connected to the bottom of the first spring.

[0005] Preferably, a die cushion block is fixedly connected to the upper section of the rod body of the ejector rod and abuts against the stripping limit post. The die cushion block has a limiting effect on the upsetting die on the ejector rod.

[0006] Preferably, it further includes a fine blanking die. A material is placed at the upper end of the fine blanking die. A fine blanking punch contacts the top of the material. A material discharging mechanism is arranged inside the fine blanking die. The material discharging mechanism includes a material discharging pin slidably connected inside the fine blanking die. A guide block is fixedly connected to the right section of the pin body of the material discharging pin, and the guide block is slidably connected inside the fine blanking die. A guide rod is fixedly connected inside the fine blanking die. The guide rod penetrates through the guide block and is slidably connected to the guide block. A second spring is sleeved on the outer side of the rod body of the guide rod. A pressure rod is fixedly connected to the bottom of the fine blanking punch. The pressure rod is slidably connected to the fine blanking die and is slidably connected to the material discharging pin. Through the arrangement of the material discharging mechanism, it has the effect of assisting in discharging the formed material and preventing it from getting stuck at the fine blanking punch.

[0007] Preferably, a limiting block is fixedly connected to the end of the guide rod, and the limiting block and the guide rod are of an integral structure. Through the arrangement of the limiting block, it has a limiting effect on the stroke of the guide block on the guide rod.

[0008] Preferably, one end of the second spring is fixedly connected to the guide block, and the other end of the second spring is fixedly connected to the inner surface of the fine blanking die. Through the arrangement of the second spring, the elastic force can act on the material discharging pin through the guide block.

[0009] Preferably, balls are arranged at the bottom of the guide block, and the balls are slidably connected to the inner surface of the fine blanking die. Through the arrangement of the balls, the relative friction between the guide block and the fine blanking die can be reduced.

[0010] The beneficial effects of the present utility model are as follows:

[0011] 1. By combining the upsetting extrusion technology and the fine blanking technology, upsetting extrusion is carried out first and then fine blanking. And a certain reserved amount will be left on the side of the material during upsetting extrusion and fine blanking. Then, a combination of a ejector rod and a spring is arranged in the upsetting extrusion die. During upsetting extrusion, the acting force of the die is on the die cushion block, which can be replaced at any time according to the actual situation, so as to ensure the stability of the part. In addition, by adopting the method of upsetting extrusion first and then fine blanking, the force on the die is reduced. At the same time, the bright band of the outer contour is greater than 85% of the material thickness, and the product matching performance is also greatly improved. The flatness and bright band effect of the outer contour make the movement of the static iron core in the magnetic conduction cylinder smoother. The smaller corner break ensures sufficient suction area with the moving iron core.

[0012] 2. The utility model is provided with a material discharging mechanism in the fine blanking die. When the fine blanking punch and the fine blanking die are closed, the pressure rod on the fine blanking punch will insert into the fine blanking die and slide into the material discharging pin in the material discharging mechanism, and make it move horizontally under force and slide into the fine blanking die. When the fine blanking punch and the fine blanking die are separated, the material discharging pin will reset under the action of the second spring and contact the joint of the material and the fine blanking punch to assist in discharging the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the upsetting and extrusion process of the utility model;

[0014] Figure 2 is a schematic structural diagram of the fine blanking process of the utility model;

[0015] Figure 3 is of the utility model Figure 2 enlarged view of the structure at A;

[0016] Figure 4 is a schematic structural diagram of the material of the utility model.

[0017] In the figure: 1. Stripping limit post; 2. Upsetting and extrusion punch; 3. Material; 4. Upsetting and extrusion die; 5. Ejector rod; 6. Die cushion block; 7. First spring; 8. Base; 9. Material discharging mechanism; 10. Fine blanking punch; 11. Fine blanking die; 91. Material discharging pin; 92. Guide block; 93. Guide rod; 94. Limit block; 95. Second spring; 96. Ball; 97. Pressure rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figure 1 、 Figure 2 、 Figure 4, A cold stamping die with a smooth cross-section, including a blanking limit post 1. Inside the blanking limit post 1, there is a material 3. A upsetting punch 2 is slidably connected inside the upper end of the blanking limit post 1, and the upsetting punch 2 contacts the material 3. A upsetting die 4 is slidably connected inside the lower end of the blanking limit post 1, and the upsetting die 4 contacts the material 3. A ejector rod 5 is fixedly connected to the bottom of the upsetting die 4. An upper section of the rod body of the ejector rod 5 is fixedly connected with a die cushion block 6, and the die cushion block 6 abuts against the blanking limit post 1. The die cushion block 6 has a limiting effect on the upsetting die 4 on the ejector rod 5. The bottom of the ejector rod 5 is fixedly connected with a first spring 7, and the bottom of the first spring 7 is fixedly connected with a base 8. A chamfer of 0.2 is designed at the cutting edge of the fine blanking and blanking die 11.

[0020] Please refer to Figure 2 , Figure 3 , It also includes a fine blanking and blanking die 11. The material 3 is placed at the upper end of the fine blanking and blanking die 11. A fine blanking punch 10 contacts the top of the material 3. A stripping mechanism 9 is arranged inside the fine blanking and blanking die 11. The stripping mechanism 9 includes a stripping pin 91 slidably connected inside the fine blanking and blanking die 11. A guide block 92 is fixedly connected to the right section of the pin body of the stripping pin 91, and the guide block 92 is slidably connected inside the fine blanking and blanking die 11. A guide rod 93 is fixedly connected inside the fine blanking and blanking die 11. The guide rod 93 penetrates through the guide block 92 and is slidably connected with the guide block 92. A second spring 95 is sleeved on the outer side of the rod body of the guide rod 93. The bottom of the fine blanking punch 10 is fixedly connected with a pressure rod 97. The pressure rod 97 is slidably connected with the fine blanking and blanking die 11, and the pressure rod 97 is slidably connected with the stripping pin 91. Through the setting of the stripping mechanism 9, it has an auxiliary stripping effect on the formed material 3, preventing it from getting stuck at the fine blanking punch 10.

[0021] Please refer to Figure 3 , A limit block 94 is fixedly connected to the end of the guide rod 93, and the limit block 94 and the guide rod 93 are of an integral structure. Through the setting of the limit block 94, it has a limiting effect on the stroke of the guide block 92 on the guide rod 93. One end of the second spring 95 is fixedly connected with the guide block 92, and the other end of the second spring 95 is fixedly connected to the inner surface of the fine blanking and blanking die 11. Through the setting of the second spring 95, the elastic force can act on the stripping pin 91 through the guide block 92. A ball 96 is arranged at the bottom of the guide block 92, and the ball 96 is slidably connected with the inner surface of the fine blanking and blanking die 11. Through the setting of the ball 96, the relative friction between the guide block 92 and the fine blanking and blanking die 11 can be reduced.

[0022] The specific implementation process of the present utility model is as follows: When in use, first use the traditional upsetting process for upsetting. The reserved amount for upsetting and fine blanking is taken as 8%-10% of the material thickness on one side. An ejector rod 5 and a first spring 7 are arranged inside the upsetting die 4. When upsetting, the acting force of the upsetting die 4 is on the die cushion block 6, which can be adjusted at any time according to the actual situation to ensure the stability of the part;

[0023] A chamfer of 0.2 is designed at the cutting edge of the fine blanking blanking concave die 11. During the downward movement of the fine blanking punch 10, the fine blanking allowance is evenly transitioned through the chamfer of the fine blanking blanking concave die 11 to obtain a uniform and bright side wall. In addition, a fine blanking gap of +0.01 mm on one side is adopted during the fine blanking process. In this way, under the action of the fine blanking allowance, the material is extruded and flows in the thickness direction, and the position of the upset extrusion collapse angle is further compensated, and finally the collapse angle is ≤0.03. In addition, due to the further compensation of the upset extrusion collapse angle during the fine blanking process, the burden of the first-step upset extrusion process is reduced, and the originally required upset extrusion saturation of 95% is reduced to 85%, improving the service life of the upset extrusion insert. During the continuous downward movement of the fine blanking punch 10, the fine blanking allowance is further extruded, accounting for about 15% of the total thickness of the material. At the final cutting position, the waste material is gradually hardened, making the fracture more complete, and forming a fracture layer lower than the upset extrusion side wall;

[0024] Moreover, when the fine blanking punch 10 and the fine blanking blanking concave die 11 are closed, the pressure rod 97 on the fine blanking punch 10 will insert into the fine blanking blanking concave die 11, and slide into the ejector pin 91 in the ejector mechanism 9, and make it move horizontally under force, and slide into the fine blanking blanking concave die 11. When the fine blanking punch 10 and the fine blanking blanking concave die 11 are separated, the ejector pin 91 will reset under the action of the second spring 95, and abut against the joint of the material 3 and the fine blanking punch 10 to assist in blanking and prevent it from getting stuck at the fine blanking punch 10.

[0025] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cold punching die with a smooth cross section, comprising a stripping limit column (1), characterized in that: The material (3) is placed inside the stripping limit column (1), the upper end of the stripping limit column (1) is slidably connected to an upsetting punch (2), and the upsetting punch (2) is in contact with the material (3), the lower end of the stripping limit column (1) is slidably connected to an upsetting die (4), and the upsetting die (4) is in contact with the material (3), the bottom of the upsetting die (4) is fixedly connected to a push rod (5), the bottom of the push rod (5) is fixedly connected to a spring (7), and the bottom of the spring (7) is fixedly connected to a base (8).

2. A cold punching die with a smooth cross section according to claim 1, characterized in that: The upper section of the rod body of the push rod (5) is fixedly connected to a die cushion block (6), and the die cushion block (6) abuts against the stripping limit column (1).

3. The cold punching die with a smooth cross section according to claim 1, characterized in that: The invention also comprises a fine blanking die (11), a material (3) is placed on the upper end of the fine blanking die (11), the top of the material (3) contacts the fine blanking punch (10), a material return mechanism (9) is arranged inside the fine blanking die (11), the material return mechanism (9) comprises a material return pin (91) slidably connected to the fine blanking die (11), a right section of the pin body of the material return pin (91) is fixedly connected to a guide block (92), and the guide block (92) is slidably connected to the fine blanking die The interior of the fine blanking die (11) is fixedly connected with a guide rod (93), the guide rod (93) passes through the guide block (92) and is slidably connected with the guide block (92), the outer side of the rod body of the guide rod (93) is sleeved with a spring 2 (95), the bottom of the fine blanking punch (10) is fixedly connected with a pressure rod (97), the pressure rod (97) is slidably connected with the fine blanking die (11), and the pressure rod (97) is slidably connected with the ejector pin (91).

4. A cold punching die with a smooth cross section according to claim 3, characterized in that: The end of the guide rod (93) is fixedly connected to a limiting block (94), and the limiting block (94) and the guide rod (93) are an integrated structure.

5. The cold punching die with a smooth cross section according to claim 3, characterized in that: One end of the second spring (95) is fixedly connected to the guide block (92), and the other end of the second spring (95) is fixedly connected to the inner surface of the fine blanking die (11).

6. The cold punching die with a smooth cross section according to claim 3, characterized in that: A ball bearing (96) is provided at the bottom of the guide block (92), and the ball bearing (96) is slidably connected to the inner surface of the fine blanking die (11).

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