A stamping die for preventing product springback

Abstract

This utility model discloses a stamping die for preventing product springback, relating to the field of stamping dies. It includes an upper die and a lower die; the upper die includes a punch with a first forming surface at its bottom; the lower die includes a float and a first lower die forming block and a second lower die forming block respectively located on the front and rear sides of the float. The top of the float has a second forming surface matching the first forming surface, and the bottom of the float has multiple vertical first nitrogen springs and multiple vertical guide pillars spaced apart. The guide pillars are fixedly connected to the bottom of the float, and guide sleeves are fitted onto the guide pillars and fixed below the float. The facing surfaces of the first and second lower die forming blocks are respectively set as inclined third and fourth forming surfaces. When the upper and lower dies are closed, the third and fourth forming surfaces are used to adjust the angles of the front and rear sides of the product. This utility model can automatically counteract the deformation after product springback after mold opening, ensuring that the product angle is formed in one go.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a stamping die for preventing product springback. Background Technology

[0002] A stamping die is a specialized piece of equipment used in stamping processes to apply pressure to metallic or non-metallic materials, causing them to undergo plastic deformation or separation to obtain workpieces of the desired shape and size. In the stamping process of some curved panel-type automotive parts, springback may occur. This means that after stamping deformation such as bending or drawing, when the pressure of the die is removed, the material partially recovers its deformation due to its inherent elasticity, resulting in a slight error compared to the actual formed shape. For example... Figure 1 The product shown is a curved panel type automotive part. The two sides of this type of product have a curved structure. During the stamping process, when the product leaves the mold, the curved structure formed on the two sides will recover its elastic deformation after the pressure of the mold is lost, causing the product shape to spring back. The bending angle of the product is different from the expected bending angle of the processing, and subsequent processing is required to adjust the bending angle. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a stamping die that prevents product springback, which can automatically offset the deformation after product springback after the die is opened, and ensure that the product angle is formed in one go.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A stamping die for preventing product springback includes an upper die and a lower die. The upper die includes a punch with a first forming surface at the bottom. The lower die includes a float and a first lower die forming block and a second lower die forming block respectively located on the front and rear sides of the float. The top of the float has a second forming surface that matches the first forming surface. The bottom of the float has multiple vertical first nitrogen springs and multiple vertical guide posts spaced apart. The piston rod of the first nitrogen spring abuts against the bottom of the float. The guide posts are fixedly connected to the bottom of the float and have guide sleeves fitted on them. The guide sleeves are fixed below the float. The facing surfaces of the first lower die forming block and the second lower die forming block are respectively set as inclined third and fourth forming surfaces. When the upper die and the lower die are closed, the third and fourth forming surfaces are used to adjust the angles of the front and rear sides of the product.

[0006] In some embodiments, the angle between the third molding surface and the bottom surface of the first lower mold molding block is less than 90 degrees, and the angle between the fourth molding surface and the bottom surface of the second lower mold molding block is less than 90 degrees.

[0007] In at least one embodiment, a circular arc transition surface is provided between the third molding surface and the top surface of the first lower mold molding block, and a circular arc transition surface is provided between the fourth molding surface and the top surface of the second lower mold molding block.

[0008] Compared with the prior art, this utility model achieves at least the following beneficial effects:

[0009] When the stamping die closes, the punch moves downward, pushing the float downward until the punch closes with the first and second lower die forming blocks. The first forming surface of the punch and the second forming surface of the float cooperate to form the product. The first and second lower die forming blocks, located on the front and rear sides of the float, are used to adjust the angles of the front and rear sides of the product, respectively. When the stamping die opens, the punch and the float move upward, and the float pushes the product upward out of the station. Since the first and second lower die forming blocks are respectively provided with inclined third and fourth forming surfaces, the third and fourth forming surfaces cause the front and rear sides of the product to bend inward at a certain angle. This bending angle is opposite to the springback direction of the front and rear sides of the product. Therefore, after the die opens, it can automatically offset the deformation after the product springs back and perform angle compensation, ensuring that the angles of the front and rear sides of the product are formed in one go, meeting the shape and size requirements of the product. Attached Figure Description

[0010] Figure 1 A structural schematic diagram of curved panel automotive parts;

[0011] Figure 2 This is a schematic diagram of the structure of an embodiment of this application;

[0012] Figure 3 This is a side view of an embodiment of this application;

[0013] Figure 4 This is an exploded view of an embodiment of this application;

[0014] Figure 5 This is a schematic diagram of the punch structure according to an embodiment of this application;

[0015] Figure 6 This is a cross-sectional view of an embodiment of this application;

[0016] Figure 7 This is a schematic diagram of the connection structure of the positioning block, positioning head and floating block in an embodiment of this application;

[0017] Figure 8 This is a cross-sectional view of the equal-height sleeve assembly according to an embodiment of this application.

[0018] The numbers in the diagram are as follows: 1. Punch; 11. Sub-punch; 111. First forming surface; 112. Positioning hole; 2. Float; 21. Second forming surface; 22. Guide hole; 3. First lower die forming block; 31. First lower die sub-forming block; 4. Second lower die forming block; 41. Second lower die forming block; 5. First nitrogen spring; 6. Guide post; 7. Guide sleeve; 8. Third forming surface; 9. Fourth forming surface; 10. Arc transition surface; 20. Positioning block; 30. Positioning head; 40. Second nitrogen spring; 50. Annular step; 60. Equal height sleeve assembly; 601. Equal height sleeve; 602. Equal height screw; 70. Product. Detailed Implementation

[0019] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] like Figures 2-8As shown, the stamping die for preventing product springback provided in this application includes an upper die and a lower die; the upper die includes a punch 1, the bottom of which is provided with a first forming surface 111; the lower die includes a float 2 and a first lower die forming block 3 and a second lower die forming block 4 respectively provided on the front and rear sides of the float 2, the top of the float 2 is provided with a second forming surface 21 that matches the first forming surface 111, when the upper die and the lower die are closed, the second forming surface 21 cooperates with the first forming surface 111 to form the product 70, thereby obtaining the desired shape, the bottom of the float 2 is provided with a plurality of vertical first nitrogen springs 5 ​​and a plurality of vertical guide posts 6, the piston rod of the first nitrogen spring 5 abuts against At the bottom of the float 2, the first nitrogen spring 5 is fixed to the other parts of the lower mold below the float 2. The guide post 6 is fixedly connected to the bottom of the float 2. The guide sleeve 7 is sleeved on the guide post 6 and fixed to the other parts of the lower mold below the float 2. The first nitrogen spring 5 is used to provide elastic force for the float 2. The guide post 6 and the guide sleeve 7 cooperate to guide the float 2 and ensure the positional accuracy of the float 2 when it moves up and down. The facing surfaces of the first lower mold forming block 3 and the second lower mold forming block 4 are respectively set as the inclined third forming surface 8 and the fourth forming surface 9. When the upper mold and the lower mold are closed, the third forming surface 8 and the fourth forming surface 9 are respectively used to adjust the angles of the front and rear sides of the product 70.

[0022] When the stamping die closes, the punch 1 moves downward, pushing the float 2 downward until the punch 1 closes with the first lower die forming block 3 and the second lower die forming block 4. The piston rod of the first nitrogen spring 5 retracts, and the first forming surface 111 at the bottom of the punch 1 cooperates with the second forming surface 21 at the top of the float 2 to form the product 70. The first lower die forming block 3 and the second lower die forming block 4, located on the front and rear sides of the float 2, are used to adjust the angles of the front and rear sides of the product 70, causing the product 70 to bend inward at a certain angle. When the stamping die opens, the punch 1 and the float 2 move upward, and the piston rod of the first nitrogen spring 5 extends towards... The upward push of the float 2 causes the product 70 to be pushed upward out of the station. Since the first lower die forming block 3 and the second lower die forming block 4 are respectively provided with inclined third forming surface 8 and fourth forming surface 9, the third forming surface 8 and the fourth forming surface 9 cause the front and rear sides of the product 70 to bend inward at a certain angle. This bending angle is opposite to the springback direction of the front and rear sides of the product 70. Therefore, after the mold is opened, it can automatically offset the deformation of the product 70 after springback and perform angle compensation to ensure that the angle of the front and rear sides of the product 70 is formed in one go, which meets the shape and size requirements of the product 70. This stamping die has high strength and durability and a long service life.

[0023] Specifically, the angle between the third forming surface 8 and the bottom surface of the first lower mold forming block 3 is less than 90 degrees, and the angle between the fourth forming surface 9 and the bottom surface of the second lower mold forming block 4 is less than 90 degrees. The specific angle can be set according to the springback characteristics of the product 70 material. For example, if the bending angle of the front and rear sides of the product 70 is 90 degrees, and it is known that the material will spring back 2 degrees, then the angle is designed to be 88 degrees, so that the bending angle of the product 70 after springback reaches exactly 90 degrees. Furthermore, an arc transition surface 10 is provided between the third forming surface 8 and the top surface of the first lower mold forming block 3, and an arc transition surface 10 is provided between the fourth forming surface 9 and the top surface of the second lower mold forming block 4, to facilitate the smooth downward movement of the product 70 and its front and rear sides to cooperate with the first lower mold forming block 3 and the second lower mold forming block 4 for forming.

[0024] The float 2 has a vertically oriented guide hole 22, and a positioning block 20 is slidably connected within the guide hole 22. Optionally, the guide hole 22 is a stepped hole, and the bottom of the positioning block 20 has a limiting step that matches the stepped hole. The positioning block 20 can move up and down within the guide hole 22, and the limiting step and the stepped hole can limit the positioning block 20. The top of the positioning block 20 has a conical positioning head 30, and the bottom of the positioning block 20 has a second nitrogen spring 40. The bottom of the second nitrogen spring 40 is fixed to other components of the lower mold below the float 2, and the piston rod of the second nitrogen spring 40 abuts against the bottom of the positioning block 20. The second nitrogen spring 40 is used to provide elastic force to the positioning block 20. The bottom of the punch 1 has a positioning hole 112 that matches the positioning head 30. Furthermore, an annular step 50 is formed between the positioning head 30 and the positioning block 20. When the upper and lower dies are closed, since the product 70 has a through hole punched in the previous stamping process, the positioning head 30 can pass through the pre-punched through hole on the product 70 and then be inserted into the positioning hole 112. The annular step 50 abuts against the lower surface of the product 70, thereby enabling precise positioning of the product 70 during the stamping process and ensuring processing accuracy.

[0025] Multiple sets of vertical equal-height sleeve assemblies 60 are spaced apart on the float 2. Each equal-height sleeve assembly 60 includes an equal-height sleeve 601 and an equal-height screw 602. The equal-height sleeve 601 is fixedly connected inside the float 2, and the equal-height screw 602 passes through the equal-height sleeve 601. The head of the equal-height screw 602 is used to abut against the upper end of the equal-height sleeve 601. A washer is provided between the head of the equal-height screw 602 and the upper end of the equal-height sleeve 601. The screw end of the equal-height screw 602 is threadedly connected to other components of the lower mold below the float 2. Thus, when the float 2 moves upward, the engagement of the heads of the equal-height sleeves 601 and the equal-height screws 602 can limit the upward movement of the float 2.

[0026] The punch 1 includes multiple sub-punches 11 with their end faces sequentially attached; the first lower die forming block 3 includes multiple first lower die sub-forming blocks 31 with their end faces sequentially attached; and the second lower die forming block 4 includes multiple second lower die forming blocks 41 with their end faces sequentially attached. By configuring the punch 1 as multiple sub-punches 11, the first lower die forming block 3 as multiple first lower die forming blocks 31, and the second lower die forming block 4 as multiple second lower die forming blocks 41, the manufacturing difficulty of the punch 1, the first lower die forming block 3, and the second lower die forming block 4 can be reduced, thus lowering manufacturing costs.

[0027] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A stamping die for preventing product springback, comprising an upper die and a lower die, characterized in that: The upper die includes a punch, and the bottom of the punch is provided with a first forming surface; The lower mold includes a float and a first lower mold forming block and a second lower mold forming block respectively disposed on the front and rear sides of the float. The top of the float is provided with a second forming surface that matches the first forming surface. The bottom of the float is provided with a plurality of vertical first nitrogen springs and a plurality of vertical guide posts spaced apart. The piston rod of the first nitrogen spring abuts against the bottom of the float. The guide posts are fixedly connected to the bottom of the float and are fitted with guide sleeves. The guide sleeves are fixed below the float. The facing surfaces of the first lower mold forming block and the second lower mold forming block are respectively set as inclined third and fourth forming surfaces. When the upper mold and the lower mold are closed, the third and fourth forming surfaces are used to adjust the angles of the front and rear sides of the product.

2. The stamping die for preventing product springback according to claim 1, characterized in that: The angle between the third molding surface and the bottom surface of the first lower mold molding block is less than 90 degrees, and the angle between the fourth molding surface and the bottom surface of the second lower mold molding block is less than 90 degrees.

3. The stamping die for preventing product springback according to claim 2, characterized in that: A circular arc transition surface is provided between the third forming surface and the top surface of the first lower mold forming block, and a circular arc transition surface is provided between the fourth forming surface and the top surface of the second lower mold forming block.

4. The stamping die for preventing product springback according to claim 1, characterized in that: The float is provided with a guide hole vertically, and a positioning block is slidably connected in the guide hole. The top of the positioning block is provided with a conical positioning head, and the bottom of the positioning block is provided with a second nitrogen spring. The piston rod of the second nitrogen spring abuts against the bottom of the positioning block. The bottom of the punch is provided with a positioning hole that matches the positioning head.

5. The stamping die for preventing product springback according to claim 4, characterized in that: An annular step is formed between the positioning head and the positioning block.

6. The stamping die for preventing product springback according to claim 1, characterized in that: The float is provided with multiple sets of vertical equal-height sleeve assemblies at intervals. Each equal-height sleeve assembly includes an equal-height sleeve and an equal-height screw. The equal-height sleeve is fixedly connected inside the float, and the equal-height screw passes through the equal-height sleeve. The head of the equal-height screw is used to abut against the upper end of the equal-height sleeve, and the screw end of the equal-height screw is threadedly connected to the lower part of the float. The equal-height sleeve assembly is used to limit the upward movement distance of the float.

7. The stamping die for preventing product springback according to claim 1, characterized in that: The punch includes multiple sub-punches with their end faces sequentially attached; the first lower die forming block includes multiple first lower die sub-forming blocks with their end faces sequentially attached, and the second lower die forming block includes multiple second lower die forming blocks with their end faces sequentially attached.

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