Punch forming process for automobile sheet metal parts

Abstract

The invention relates to a punch forming process of an automobile sheet metal part, and belongs to the technical field of punching. Comprising the following steps that S1, feeding is conducted, specifically, a material is fed into a stamping die; s2, stamping is conducted, specifically, an upper die is pressed downwards to stamp the material; s3, the die is opened, and after stamping is completed, the upper die moves upwards to expose the sheet metal part; s4, the sheet metal part is ejected, an ejection mechanism is arranged at the bottom of the lower die, an air blowing cavity is formed in the ejection mechanism, an air blowing mechanism is installed at the air inlet end of the air blowing cavity, and the air outlet end of the air blowing cavity communicates with a forming cavity of the lower die; in the upward moving process of the upper die, the blowing mechanism is driven to blow compressed gas into the forming cavity, so that the sheet metal part and the forming cavity directly form a gas layer, and then the ejection mechanism ascends to eject the sheet metal part; and S5, material taking is conducted, specifically, the sheet metal part on the lower die is taken out for the next stamping step. According to the stamping die, the problem that in the stamping process of an existing sheet metal part, the sheet metal part is prone to being tightly attached to the stamping die, and consequently the sheet metal part is difficult to take out is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of stamping, and in particular relates to a stamping forming process for automobile sheet metal parts. Background Art

[0002] In the entire automobile manufacturing process, stamping parts account for more than 65% of the entire automobile parts. It can be seen that stamping parts play a pivotal role in automobile manufacturing. Stamping parts specifically refer to the use of mechanical devices such as punching machines or molds to apply corresponding external forces to a series of materials such as plates, so that these materials produce plastic deformation or separation, thereby obtaining a variety of workpieces.

[0003] Existing sheet metal stamping is mostly achieved by butting and impacting the upper and lower dies. However, under repeated impacts of the upper die, the collision between the upper die, the lower die and the sheet metal will generate high temperature. Not only will the high temperature of the die easily burn the user after touching it, but the die will also continue to work at high temperature, affecting the service life of the die. After the metal plate is stamped, the sheet metal needs to be removed from the stamping die. During this process, the ejector mechanism in the lower die will lift the stamped sheet metal off the lower die to facilitate the removal of the sheet metal. However, since the stamped sheet metal fits tightly with the stamping die, the friction between the sheet metal and the inner wall of the stamping die is relatively large, which makes it difficult for the ejector mechanism to remove the sheet metal from the stamping die when ejecting the sheet metal. If the ejector force is small, the sheet metal cannot be ejected due to the large dead weight of the sheet metal and the friction. If the ejector force is too large, the sheet metal is easily bent under the influence of friction, which greatly increases the difficulty of removing the sheet metal. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a stamping forming process for automobile sheet metal parts, which solves the problem that the existing sheet metal parts are easily tightly fitted with the stamping mold during the stamping process, making it difficult to remove the sheet metal parts.

[0005] The purpose of the present invention can be achieved by the following technical solution: A stamping forming process for automobile sheet metal parts, comprising the following steps:

[0006] S1: Loading, loading the material into the stamping die;

[0007] S2: Stamping, the upper die presses down to stamp the material;

[0008] S3: Open the mold, and after stamping is completed, the upper mold moves up to reveal the sheet metal part;

[0009] S4: Eject the sheet metal part. An ejection mechanism is provided at the bottom of the lower mold. A blowing cavity is provided in the ejection mechanism. The blowing mechanism is installed at the air inlet end of the blowing cavity. The air outlet end of the blowing cavity is connected to the forming cavity of the lower mold. When the upper mold moves upward, the blowing mechanism will be driven to blow compressed gas into the forming cavity so that a gas layer is directly formed between the sheet metal part and the forming cavity. Then the ejection mechanism rises to lift the sheet metal part.

[0010] S5: Take the material and take out the sheet metal part on the lower die for the next stamping step.

[0011] As a preferred technical solution of the present invention, a guide column is provided on the top surface of the lower mold, the upper mold is slidably connected to the guide column, and a push rod is provided on the bottom surface of the upper mold, and the push rod is located on one side of the guide column. The blowing mechanism includes a reciprocating push-pull assembly, a shell, a turbine and a screw. The shell is installed on the outside of the air inlet end of the blowing chamber, and the bottom and side surfaces of the shell are provided with an air outlet and an air inlet, and the air outlet is communicated with the blowing chamber, the turbine is rotatably connected to the shell, the screw is rotatably connected to the top surface of the shell and connected to the turbine, the output end of the reciprocating push-pull assembly is connected to the screw, and the input end of the reciprocating push-pull assembly is connected to the bottom end of the push rod, and the upper mold moves to drive the reciprocating push-pull assembly so that the screw drives the turbine to rotate to blow air into the blowing chamber.

[0012] As a preferred technical solution of the present invention, a groove is provided on the top of the lower mold, and the reciprocating push-pull assembly includes a sliding rod, a connecting rod, a crank and a rotating wheel. The sliding rod is slidably connected in the groove, the top end of the sliding rod is connected to the push rod, and the bottom end is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the crank, the crank is rotatably connected to a side wall of the groove and connected to the rotating wheel, and the rotating wheel is connected to the screw.

[0013] As a preferred technical solution of the present invention, a plurality of air outlet holes are provided on the bottom surface of the molding cavity of the lower mold, and the plurality of air outlet holes are communicated with the blowing cavity.

[0014] As a preferred technical solution of the present invention, a check valve is provided at the air inlet end of the blowing chamber, and a pressure release valve is provided at the air outlet. The pressure release valve is used to block the air outlet and open the air outlet when a preset pressure is reached in the blowing chamber.

[0015] As a preferred technical solution of the present invention, in step S2, the upper mold is pressed down to blow air into the blowing cavity through the blowing mechanism. In step S4, air is blown into the blowing cavity through the blowing mechanism when the upper mold moves upward, and the pressure release valve opens the air outlet after it is in place when the upper mold moves upward.

[0016] As a preferred technical solution of the present invention, in step S4, the blowing mechanism blows air into the molding cavity to cool the lower mold.

[0017] As a preferred technical solution of the present invention, the ejection mechanism is provided in plurality according to the size of the molding cavity, and the ejection mechanism comprises a mounting seat and a lifter, the lifter is mounted on the top surface of the mounting seat, and the mounting seat is mounted on the bottom surface of the lower mold.

[0018] The beneficial effects of the present invention are as follows: by opening a blowing cavity at the position of the lower mold ejection mechanism, and arranging the blowing mechanism to communicate with the blowing cavity, the upper mold can drive the blowing mechanism to blow air into the blowing cavity during the mold opening process, and the blowing cavity can blow gas into the space between the sheet metal part and the forming cavity during the mold opening process, so that the space between the sheet metal part and the forming cavity can be filled with gas, thereby reducing the contact area between the sheet metal part and the forming cavity, allowing the sheet metal part to briefly fall off from the forming cavity under the action of the gas layer, allowing the sheet metal part to fall off and be tightly connected with the forming cavity, allowing the lifting mechanism to easily lift the sheet metal part up during the lifting process to carry out the process of taking out the material, thereby improving the quality of the sheet metal parts completed by stamping, reducing the stamping time, and improving the stamping efficiency, solving the problem that the existing sheet metal parts are easily tightly fitted with the stamping mold during the stamping process, making it difficult to take out the sheet metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a partial cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the lower mold structure of the present invention;

[0023] Figure 4 This is a bottom view of the lower mold structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the reciprocating push-pull assembly of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the blowing mechanism of the present invention;

[0026] Main component symbols

[0027] In the figure: 1. upper mold; 2. lower mold; 21. guide column; 22. air outlet; 23. groove; 3. ejector mechanism; 31. mounting seat; 32. lifter; 4. blowing chamber; 5. blowing mechanism; 51. housing; 511. air outlet; 512. air inlet; 52. turbine; 53. screw; 6. reciprocating push-pull assembly; 61. sliding rod; 62. connecting rod; 63. crank; 64. rotating wheel; 7. push rod. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] In the process of making sheet metal parts for automobiles, most of them are made by stamping. In the process of stamping, the upper and lower dies are combined to stamp the material into the required shape of automobile parts. In the process of forming the sheet metal parts, they will abut against the forming cavity of the lower die to form the required shape, which will make the stamped sheet metal parts fit tightly with the stamping die, resulting in a large friction between the sheet metal parts and the inner wall of the stamping die. This results in the fact that whether the sheet metal parts are taken out manually or by automatic mechanical equipment, they are easily affected by friction, which increases the difficulty of taking out. In addition, the thickness of existing sheet metal parts is usually thin. When the sheet metal parts fit tightly with the forming cavity of the lower die, the ejection mechanism will change the shape of the sheet metal parts due to excessive friction when ejecting the sheet metal parts. Therefore, in order to avoid the above problems, please refer to Figure 1-Figure 6 , this embodiment provides a stamping forming process for automobile sheet metal parts, comprising the following steps:

[0030] S1: Loading, loading the material into the stamping die;

[0031] S2: stamping, after the material is loaded, the upper die 1 presses down to stamp the material;

[0032] S3: Open the mold, and after stamping is completed, the upper mold 1 moves upward to release the sheet metal part;

[0033] S4: ejecting the sheet metal part. An ejection mechanism 3 is provided at the bottom of the lower mold 2. A blowing cavity 4 is provided in the ejection mechanism 3. A blowing mechanism 5 is installed at the air inlet end of the blowing cavity 4. The air outlet end of the blowing cavity 4 is connected to the molding cavity of the lower mold 2. When the upper mold 1 moves upward, the blowing mechanism 5 will be driven to blow compressed gas into the molding cavity so that a gas layer is directly formed between the sheet metal part and the molding cavity, so that the sheet metal part can fall off from the molding cavity as much as possible, reducing the contact area between the sheet metal part and the molding cavity, thereby reducing the friction force, so that the ejection mechanism 3 can rise and smoothly lift the sheet metal part;

[0034] S5: Take the material and take out the sheet metal part on the lower die 2 for the next stamping step.

[0035] By opening a blowing cavity 4 at the position of the ejection mechanism 3 of the lower mold 2, and arranging the blowing mechanism 5 to communicate with the blowing cavity 4, the upper mold 1 can drive the blowing mechanism 5 to blow air into the blowing cavity 4 during the mold opening process, and the blowing cavity 4 can blow gas into the space between the sheet metal part and the molding cavity during the mold opening process, so that the space between the sheet metal part and the molding cavity can be filled with gas, thereby reducing the contact area between the sheet metal part and the molding cavity, allowing the sheet metal part to temporarily fall off from the molding cavity under the action of the gas layer, so that the sheet metal part falls off and is tightly connected with the molding cavity, and the lifting mechanism can easily lift the sheet metal part up to take the material during the lifting process, thereby improving the quality of the stamped sheet metal part, reducing the stamping time, and improving the stamping efficiency.

[0036] During the stamping process of the upper mold 1, in order to ensure the stamping stability and accuracy of the upper mold 1, a guide column 21 is provided on the top surface of the lower mold 2, and the upper mold 1 is slidably connected to the guide column 21, and four guide columns 21 are usually provided. Therefore, in order to better allow the upper mold 1 to drive the blowing mechanism 5 to blow into the blowing cavity 4 during the mold opening process to reduce the friction between the sheet metal and the molding cavity, in this embodiment, a push rod 7 is provided on the bottom surface of the upper mold 1, and the push rod 7 is located on one side of the guide column 21. The blowing mechanism 5 includes a reciprocating push-pull component 6, a shell 51, a turbine 52 and a screw 53. The shell 51 is installed on the outside of the air inlet end of the blowing cavity 4. The bottom and side surfaces of the shell 51 are provided with an air outlet 511 and an air inlet 512. The air outlet 511 is communicated with the blowing cavity 4, and the turbine 52 is rotatably connected to the shell 51. The screw 53 is rotatably connected to the top surface of the shell 51 and is connected to the turbine 52. The output end of the reciprocating push-pull assembly 6 is connected to the screw 53, and the input end of the reciprocating push-pull assembly 6 is connected to the bottom end of the push rod 7. The upper mold 1 moves to drive the reciprocating push-pull assembly 6 so that the screw 53 drives the turbine 52 to rotate to blow air into the blowing cavity 4. During the opening process of the upper mold 1, the upper mold 1 will drive the reciprocating push-pull assembly 6 to operate through the push rod 7, so that the screw 53 drives the turbine 52 to rotate, so that external air can enter the shell 51 from the air inlet 512, and then enter the blowing cavity 4 through the air outlet 511, and then enter the molding cavity from the blowing cavity 4, so that the gas can flow between the sheet metal and the molding cavity so that the sheet metal is no longer in close contact with the molding cavity, so that the sheet metal can be better completed.

[0037] In order to allow the gas blown out from the blowing cavity 4 to reduce the situation where the sheet metal parts are tightly abutted against the side wall of the forming cavity, in one embodiment, a groove 23 is opened on the top of the lower mold 2, and the reciprocating push-pull assembly 6 includes a slide bar 61, a connecting rod 62, a crank 63 and a rotating wheel 64. The slide bar 61 is slidably connected in the groove 23, the top end of the slide bar 61 is connected to the push rod 7, and the bottom end is rotatably connected to one end of the connecting rod 62, and the other end of the connecting rod 62 is rotatably connected to the crank 63, and the crank 63 is rotatably connected to one side wall of the groove 23 and connected to the rotating wheel 64, and the rotating wheel 64 is connected to the screw 53. During the stamping process, the upper mold 1 is pressed down to drive the slide bar 61 to slide through the push rod 7, the slide bar 61 drives the crank 63 to rotate through the connecting rod 62, and the crank 63 drives the screw 53 to rotate through the rotating wheel 64, so that the turbine 52 can rotate to move the external The gas is blown into the blowing cavity 4, and when the upper mold 1 moves up, the slide bar 61 slides upward, and the crank 63 is driven to rotate by the connecting rod 62 to allow air to enter the blowing cavity 4; and when the upper mold 1 is pressed down, the sheet metal will be pressed into the molding cavity, and the gas blown into the blowing cavity 4 will be blocked by the sheet metal and the gas cannot smoothly enter the molding cavity, and when the upper mold 1 moves up, the external force on the sheet metal disappears, and the blowing cavity 4 is still continuously increasing the gas, thereby increasing the air pressure in the blowing cavity 4, so the gas in the blowing cavity 4 will continue to be blown into the molding cavity, making the air pressure of the gas blown into the blowing cavity 4 greater, so as to better separate the position where the sheet metal is closely connected with the molding cavity to reduce the friction of the sheet metal during the blanking process, thereby reducing the difficulty of blanking the sheet metal.

[0038] In order to better separate the sheet metal from the interior of the molding cavity, in one embodiment, a plurality of air outlet holes 22 are provided on the bottom surface of the molding cavity of the lower mold 2, and the plurality of air outlet holes 22 are all connected to the blowing cavity 4. By providing a plurality of air outlet holes 22 on the bottom surface of the molding cavity, the gas in the blowing cavity 4 can act more evenly on the entire sheet metal, thereby better separating the sheet metal from the molding cavity, forming a certain gap, and reducing the difficulty of taking out the sheet metal.

[0039] During the downward pressing of the upper mold 1, the material at this time has not yet formed a sheet metal machine, that is, the air vent 22 on the molding cavity at this time is not blocked. Therefore, the first half of the stamping stroke of the upper mold 1 cannot allow air to remain in the blowing cavity 4, but it is not until the second half of the stroke that the sheet metal can block the air vent 22 to reduce the occurrence of a situation where the sheet metal is tightly abutted against the side wall of the molding cavity. Therefore, in order to better utilize the gas generated by the upper mold 1 during the movement, while increasing the air pressure in the blowing cavity 4, the blowing cavity 4 can better separate the sheet metal from the side wall of the molding cavity when blowing the gas, so that the sheet metal can be in a relaxed state after the stamping is completed. State, in one embodiment, a check valve is provided at the air inlet end of the blowing chamber 4, and a pressure release valve is provided at the air outlet 22, the pressure release valve is used to block the air outlet 22 and open the air outlet 22 when a preset pressure is reached in the blowing chamber 4, and the air pressure in the blowing chamber 4 can be continuously increased during the stamping and upward movement of the upper mold 1 by setting the pressure release valve and the check valve, and when the pressure in the blowing chamber 4 reaches the preset pressure, the pressure release valve is opened to release the gas stored in the blowing chamber 4 into the molding cavity, thereby separating the sheet metal from the side wall of the molding cavity, so that the sheet metal can better complete the unloading process after the stamping is completed.

[0040] In order to allow the upper mold 1 to blow air directly into the molding cavity when the blowing cavity 4 moves into position to facilitate the removal of the sheet metal, in one embodiment, in step S2, the upper mold 1 is pressed down to blow air into the blowing cavity 4 through the blowing mechanism 5, and in step S4, the upper mold 1 is moved up to blow air into the blowing cavity 4 through the blowing mechanism 5, and the pressure release valve opens the air outlet 22 after the upper mold 1 is in place when the upper mold 1 moves up. The pressure value set by the pressure release valve is between the pressure value increased after the upper mold 1 is stamped into place and the pressure value increased in the blowing cavity 4 when the upper mold 1 moves twice. Therefore, when the upper mold 1 is stamped and moved into place, the pressure release valve will open the air outlet 22, avoiding the situation where the pressure set by the pressure release valve is too low or too high, resulting in the sheet metal being unable to be smoothly separated from the inner wall of the molding cavity.

[0041] While the upper mold 1 is performing continuous stamping, the collision between the upper mold, the lower mold and the sheet metal will generate high temperature and affect the service life of the mold. Therefore, in order to reduce the temperature generated by the upper mold 1 during the continuous stamping process, in step S4, the blowing mechanism 5 blows air into the molding cavity to cool the lower mold 2. The gas blown from the blowing mechanism 5 will act on the entire molding cavity. Therefore, when this part of the gas flows in the molding cavity, it will also take away the heat generated in the stamping process, thereby achieving a cooling effect.

[0042] In order to better take out the stamped sheet metal for the next stamping process, in one embodiment, the ejection mechanism 3 is provided with multiple ones according to the size of the forming cavity. The ejection mechanism 3 includes a mounting seat 31 and a lifter 32. The lifter 32 is installed on the top surface of the mounting seat 31, and the mounting seat 31 is installed on the bottom surface of the lower mold 2. By setting up multiple ejection mechanisms 3 to eject the sheet metal parts, it is ensured that the sheet metal parts can complete the ejection process better after the stamping is completed, so that the sheet metal parts can be taken out faster and the stamping efficiency is improved.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A stamping process for automobile sheet metal parts, characterized in that: The following steps are involved: S1: Loading, loading the material into the stamping die; S2: Stamping, the upper die presses down to stamp the material; S3: Open the mold, and after stamping is completed, the upper mold moves up to reveal the sheet metal part; S4: Eject the sheet metal part. An ejection mechanism is provided at the bottom of the lower mold. A blowing cavity is provided in the ejection mechanism. The blowing mechanism is installed at the air inlet end of the blowing cavity. The air outlet end of the blowing cavity is connected to the forming cavity of the lower mold. When the upper mold moves upward, the blowing mechanism will be driven to blow compressed gas into the forming cavity so that a gas layer is directly formed between the sheet metal part and the forming cavity. Then the ejection mechanism rises to lift the sheet metal part. S5: Take the material and take out the sheet metal part on the lower die for the next stamping step.

2. The stamping forming process of an automobile sheet metal part according to claim 1, characterized in that: The top surface of the lower mold is provided with a guide column, the upper mold is slidably connected to the guide column, the bottom surface of the upper mold is provided with a push rod, and the push rod is located on one side of the guide column. The blowing mechanism includes a reciprocating push-pull assembly, a shell, a turbine and a screw. The shell is installed on the outside of the air inlet end of the blowing chamber, and the bottom and side surfaces of the shell are provided with an air outlet and an air inlet, the air outlet is communicated with the blowing chamber, the turbine is rotatably connected to the shell, the screw is rotatably connected to the top surface of the shell and connected to the turbine, the output end of the reciprocating push-pull assembly is connected to the screw, and the input end of the reciprocating push-pull assembly is connected to the bottom end of the push rod, and the upper mold moves to drive the reciprocating push-pull assembly so that the screw drives the turbine to rotate to blow air into the blowing chamber.

3. The stamping forming process of an automobile sheet metal part according to claim 2, characterized in that: A groove is provided on the top of the lower mold, and the reciprocating push-pull assembly includes a sliding rod, a connecting rod, a crank and a rotating wheel. The sliding rod is slidably connected in the groove, the top end of the sliding rod is connected to the push rod, and the bottom end is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the crank, the crank is rotatably connected to a side wall of the groove and connected to the rotating wheel, and the rotating wheel is connected to the screw.

4. The stamping forming process of an automobile sheet metal part according to claim 2, characterized in that: The bottom surface of the molding cavity of the lower mold is provided with a plurality of air outlet holes, and the plurality of air outlet holes are all communicated with the blowing cavity.

5. The stamping forming process of an automobile sheet metal part according to claim 4, characterized in that: A check valve is provided at the air inlet end of the blowing cavity, and a pressure release valve is provided at the air outlet. The pressure release valve is used to block the air outlet and open the air outlet when a preset pressure is reached in the blowing cavity.

6. The stamping forming process of an automobile sheet metal part according to claim 5, characterized in that: In step S2, the upper mold is pressed down to blow air into the blowing cavity through the blowing mechanism. In step S4, the upper mold is moved up to blow air into the blowing cavity through the blowing mechanism. The pressure release valve opens the air outlet after it is in place when the upper mold moves up.

7. The stamping forming process of an automobile sheet metal part according to claim 1, characterized in that: In step S4, the blowing mechanism blows air into the molding cavity to cool the lower mold.

8. The stamping forming process of an automobile sheet metal part according to claim 1, characterized in that: The ejection mechanism is provided in plurality according to the size of the molding cavity. The ejection mechanism comprises a mounting seat and a lifter. The lifter is mounted on the top surface of the mounting seat, and the mounting seat is mounted on the bottom surface of the lower mold.

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