Hot stamping die with lateral air pressure loading device

Abstract

The invention discloses a hot stamping die with a lateral air pressure loading device, belongs to the technical field of stamping forming, and aims to solve the problem that cracking is prone to occurring when an existing hot stamping forming die is used for conducting small-fillet and complex-shape forming on a workpiece. The upper die body is arranged on the lower die body in a buckled mode and spliced with the lower die body, the two sides of the hot stamping die are each provided with a side loading unit, a limiting part of each side loading unit is installed on the upper die body, and a working part of each side loading unit is installed on the lower die body. And the working part of each side loading unit is matched with the lower die main body to realize stamping forming on the small fillet characteristic part of the edge of the workpiece. The die is mainly used for carrying out hot stamping forming on a workpiece plate with the small fillet characteristic.

Description

Technical Field

[0001] The invention relates to the technical field of stamping and forming, and in particular to a hot stamping die with a lateral gas pressure loading device. Background Art

[0002] Hot stamping dies are dies specially used for stamping metal materials under high temperature conditions. They produce high-strength and high-precision parts by heating the metal material to a certain temperature and then stamping it in a specific die. They are widely used in the automotive industry, aviation, national defense and some industries that require high-performance structural parts.

[0003] Traditional hot stamping dies are directly formed by one-time mold closing, and can generally directly form parts with high shape and size accuracy. However, when forming some small rounded shapes, tensile stress may be involved, and cracking may occur during the forming process. Therefore, in order to improve the forming quality of hot stamping, it is very in line with practical needs to develop a hot stamping die with a lateral gas pressure loading device. Summary of the invention

[0004] In order to solve the problem that cracking is easy to occur when a workpiece is formed into a small fillet or a complex shape using an existing hot stamping forming die, the present invention provides a hot stamping die with a lateral gas pressure loading device;

[0005] A hot stamping die with a lateral air pressure loading device, the hot stamping die comprising an upper die body and a lower die body, the upper die body being buckled on the lower die body, and a side loading unit being respectively provided on both sides of the hot stamping die, the limiting part of each side loading unit being installed on the upper die body, the working part of each side loading unit being installed on the lower die body, and the working part of each side loading unit cooperating with the lower die body to realize stamping and forming of a small fillet feature at the edge of a workpiece;

[0006] Furthermore, an upper die seat is provided on the top of the upper die body, the upper die seat and the upper die body are integrally formed, the upper die body is detachably connected to the pressure end of the press through the upper die seat, and a plurality of upper die temperature measuring holes are processed on the side of the upper die body;

[0007] Further, an upper die hoisting assembly is respectively provided on both sides of the upper die main body, each upper die hoisting assembly includes two upper die hoisting protrusions, the two upper die hoisting protrusions are symmetrically arranged along the center line of the length direction of the upper die main body, and one end of each upper die hoisting protrusion is fixedly connected to the upper die main body;

[0008] Furthermore, a lower die seat is provided at the bottom of the lower die body, the lower die seat and the lower die body are integrally formed, the lower die body is detachably connected to the working platform of the press through the lower die seat, and a plurality of lower die temperature measuring holes are processed on the side of the lower die body;

[0009] Further, a lower die hoisting assembly is respectively provided on both sides of the lower die main body, each lower die hoisting assembly comprises two lower die hoisting protrusions, the two lower die hoisting protrusions are symmetrically arranged along the center line of the length direction of the lower die main body, and one end of each lower die hoisting protrusion is fixedly connected to the lower die main body;

[0010] Further, at least one guide assembly is provided on the hot stamping die, and the guide assembly includes an upper die guide groove and a lower die guide block, the upper die guide groove is arranged on one side of the upper die body, and the upper die guide groove and the upper die body are integrally formed, the lower die guide block is arranged on one side of the lower die body, and the lower die guide block is arranged directly below the upper die guide groove, and the lower die guide block is integrally formed with the lower die body, and the upper die body is accurately molded with the lower die body through the cooperation of the upper die guide groove and the lower die guide block;

[0011] Furthermore, the side loading unit includes a loading fixing seat, a limiting assembly, a push block and two bellows, the loading fixing seat is arranged on one side of the lower mold body and is detachably connected to the lower mold body by bolts, the limiting assembly is arranged above the loading fixing seat, and the limiting assembly is arranged on one side of the upper mold body and is detachably connected to the upper mold body by bolts, the two bellows are symmetrically arranged in the loading fixing seat along the center line of the length extension direction of the loading fixing seat, and the axial extension direction of the bellows is arranged in the same direction as the width extension direction of the loading fixing seat, one end of each bellows is connected to a vent hole pre-processed on the loading fixing seat, the push block is arranged on the other end of the two bellows, and the push block and the two bellows are fixedly connected, the push block is arranged in correspondence with the small fillet feature base in the lower mold body, and the push block is driven by the bellows to extrude the workpiece and make the workpiece closely contact with the small fillet feature base on the side of the lower mold body, thereby realizing stamping and forming of the small fillet feature on the edge of the workpiece;

[0012] Further, the limit assembly includes a first limit block and a second limit block, the first limit block is located above the front end of the loading fixed seat, and the first limit block is detachably connected to the upper mold body by bolts, and the second limit block is located above the rear end of the loading fixed seat, and the second limit block is detachably connected to the upper mold body by bolts;

[0013] Furthermore, a first limiting groove cooperating with a first limiting block is processed on the top of the front end of the loading fixing seat, and a second limiting groove cooperating with a second limiting block is processed on the top of the front end of the loading fixing seat;

[0014] Furthermore, the push block and the other ends of the two bellows are fixed by welding;

[0015] The beneficial effects of this application compared to the prior art are as follows:

[0016] The present application provides a hot stamping die with a lateral air pressure loading device, which forms the small rounded corner feature part of the workpiece by means of lateral air pressure loading after limited mold closing, and well converts the tensile stress generated during traditional mold closing forming into compressive stress, which can effectively solve the problems of forming small rounded corner features and some workpiece cracking caused by complex shapes and tensile stress during hot stamping. At the same time, the lateral loading pressure used in the present application for forming the small rounded corner feature part is gas pressure. Compared with direct forming by a press, the pressure is more controllable, the strain rate is smaller, and the forming is smoother, which has a good effect on solving the cracking problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the composition of the hot stamping die described in this application;

[0018] Figure 2 This is a schematic diagram of the structure of the hot stamping die described in this application;

[0019] Figure 3 This is a schematic diagram of the mold closing of the hot stamping mold described in this application;

[0020] Figure 4 This is a schematic diagram of the structure of the side loading unit in the hot stamping die described in this application;

[0021] Figure 5 This is a schematic diagram of the structure of the side loading unit in the hot stamping die described in this application;

[0022] Figure 6 Schematic diagram of the hot stamping die in this application during operation

[0023] Figure 7 This is a schematic diagram of forming a small rounded corner feature portion by the hot stamping die described in this application;

[0024] In the figure, 1 is an upper die body, 11 is an upper die temperature measuring hole, 12 is an upper die seat, 13 is an upper die lifting protrusion, 14 is an upper die guide groove, 2 is a lower die body, 21 is a lower die temperature measuring hole, 22 is a lower die seat, 23 is a lower die lifting protrusion, 24 is a lower die guide block, 25 is a small fillet feature base, 3 is a side loading unit, 31 is a loading fixed seat, 32 is a limit assembly, 33 is a bellows, 34 is a push block, 35 is a vent hole and 4 is a workpiece sheet. DETAILED DESCRIPTION

[0025] Specific implementation method 1: Combination Figures 1 to 7To describe this embodiment, a hot stamping die with a lateral air pressure loading device is provided in this embodiment. The hot stamping die includes an upper die body 1 and a lower die body 2. The upper die body 1 is buckled on the lower die body 2 and is arranged in a combined manner with the lower die body 2. A side loading unit 3 is respectively provided on both sides of the hot stamping die. The limiting part of each side loading unit 3 is installed on the upper die body 1, and the working part of each side loading unit 3 is installed on the lower die body 2. The working part of each side loading unit 3 cooperates with the lower die body 2 to realize stamping and forming at the small round corner feature of the workpiece edge.

[0026] In this embodiment, by arranging the side loading unit 3 on the side of the hot stamping die, stamping and forming are realized on the small round corner feature parts on both sides of the workpiece. Compared with the traditional hot stamping method of directly forming in one die closing, using the stamping die provided in this application can change the tensile stress received by the special small round corner feature part during forming into compressive stress, greatly improving the success rate of forming the small round corner feature part during work and avoiding the occurrence of workpiece cracking. The surface of the mold cavity of the upper die body 1 and the lower die body 2 are both nitrided to improve the service life of the mold.

[0027] Specific embodiment two: Combined with Figures 1 to 7 To describe this embodiment, the difference between this embodiment and the first specific embodiment is that an upper die base 12 is provided at the top of the upper die body 1. The upper die base 12 is integrally formed with the upper die body 1. The upper die body 1 is detachably connected to the pressing end of the press through the upper die base 12. A plurality of upper die temperature measuring holes 11 are machined on the side of the upper die body 1. Other components and connection methods are the same as those in the first specific embodiment.

[0028] Specific embodiment three: Combined with Figures 1 to 7 To describe this embodiment, the difference between this embodiment and the second specific embodiment is that an upper die lifting assembly is respectively provided on both sides of the upper die body 1. Each upper die lifting assembly includes two upper die lifting protrusions 13. The two upper die lifting protrusions 13 are symmetrically arranged left and right along the center line of the length direction of the upper die body 1. One end of each upper die lifting protrusion 13 is fixedly connected to the upper die body 1. Other components and connection methods are the same as those in the second specific embodiment.

[0029] Combined with the second and third specific embodiments, the upper die base 12 is detachably connected to the pressing end of the press through a pressing plate and bolt structure. Generally, four upper die temperature measuring holes 11 are provided. The four upper die temperature measuring holes 11 are evenly divided into two groups. Each group of upper die temperature measuring holes 11 is arranged on one long side of the upper die body 1, and the two upper die temperature measuring holes 11 in each group are symmetrically arranged along the center line of the length direction of the upper die body 1. The upper die temperature measuring holes 11 are used in cooperation with thermocouples to be responsible for real-time monitoring of the upper die temperature, accurately controlling the temperature, ensuring the forming process, and the upper die lifting protrusions 13 are used for lifting and transporting in cooperation with slings.

[0030] Specific implementation method four: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the specific embodiment 3 is that a lower die seat 22 is provided at the bottom of the lower die body 2, the lower die seat 22 is integrally formed with the lower die body 2, the lower die body 2 is detachably connected to the working platform of the press through the lower die seat 22, and a plurality of lower die temperature measuring holes 21 are processed on the side of the lower die body 2. Other components and connection methods are the same as those of the specific embodiment 3.

[0031] Specific implementation method five: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the specific embodiment 4 is that a lower die hoisting assembly is respectively provided on both sides of the lower die body 2, and each lower die hoisting assembly includes two lower die hoisting protrusions 23. The two lower die hoisting protrusions 23 are symmetrically arranged along the center line of the length direction of the lower die body 2, and one end of each lower die hoisting protrusion 23 is fixedly connected to the lower die body 2. Other components and connection methods are the same as those of the specific embodiment 4.

[0032] In combination with the description of specific implementation mode fourth and specific implementation mode five, the lower die base 22 is detachably connected to the working platform of the press through a pressure plate and a bolt structure, and the lower die temperature measuring holes 21 are also set to four, and the four lower die temperature measuring holes 21 are evenly divided into two groups. Each group of lower die temperature measuring holes 21 is set on a long side of the lower die body 2, and the two lower die temperature measuring holes 21 in each group are symmetrically arranged along the center line of the length direction of the lower die body 2. At the same time, each lower die temperature measuring hole 21 is arranged corresponding to an upper die temperature measuring hole 11. The lower die temperature measuring hole 21 is used in conjunction with a thermocouple to monitor the lower die temperature in real time, accurately control the temperature, and ensure the forming process. The lower die lifting protrusion 23 is used to cooperate with the sling for lifting and transportation.

[0033] Specific implementation method six: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the specific embodiment 5 is that at least one guide assembly is provided on the hot stamping die, and the guide assembly includes an upper die guide groove 14 and a lower die guide block 24. The upper die guide groove 14 is arranged on one side of the upper die body 1, and the upper die guide groove 14 is integrally formed with the upper die body 1. The lower die guide block 24 is arranged on one side of the lower die body 2, and the lower die guide block 24 is arranged directly below the upper die guide groove 14. The lower die guide block 24 is integrally formed with the lower die body 2. The upper die body 1 is accurately molded with the lower die body 2 through the cooperation of the upper die guide groove 14 and the lower die guide block 24. Other components and connection methods are the same as those in the specific embodiment 5.

[0034] In this embodiment, the motion trajectory between the upper die guide groove 14 and the lower die guide block 24 can be positioned and guided by the guide assembly, thereby ensuring the accuracy of the mold closing between the upper die guide groove 14 and the lower die guide block 24 .

[0035] Specific implementation method seven: Combination Figures 1 to 7 The present embodiment is described. The present embodiment is different from the specific embodiment 6 in that the side loading unit 3 includes a loading fixed seat 31, a limiting assembly 32, a push block 34 and two bellows 33. The loading fixed seat 31 is arranged on one side of the lower mold body 2 and is detachably connected to the lower mold body 2 by bolts. The limiting assembly 32 is arranged above the loading fixed seat 31, and the limiting assembly 32 is arranged on one side of the upper mold body 1 and is detachably connected to the upper mold body 1 by bolts. The two bellows 33 are symmetrically arranged in the loading fixed seat 31 along the center line of the length extension direction of the loading fixed seat 31, and the bellows 33 are symmetrically arranged in the loading fixed seat 31. The axis extension direction of the two bellows 33 is arranged in the same direction as the width extension direction of the loading and fixing seat 31, one end of each bellows 33 is connected to the vent hole 35 pre-processed on the loading and fixing seat 31, and the push block 34 is arranged on the other end of the two bellows 33, and the push block 34 and the two bellows 33 are fixedly connected. The push block 34 is arranged in correspondence with the small rounded corner feature base 25 in the lower mold body 2, and the push block 34 is driven by the bellows 33 to squeeze the workpiece and make the workpiece and the small rounded corner feature base 25 on the side of the lower mold body 2 closely contact, so as to realize the stamping of the small rounded corner feature of the edge of the workpiece. Other components and connection methods are the same as those of the specific embodiment 6.

[0036] Specific implementation method eight: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the seventh embodiment is that the limit assembly 32 includes a first limit block and a second limit block. The first limit block is located above the front end of the loading and fixing seat 31, and the first limit block is detachably connected to the upper mold body 1 by bolts. The second limit block is located above the rear end of the loading and fixing seat 31, and the second limit block is detachably connected to the upper mold body 1 by bolts. Other components and connection methods are the same as those of the seventh embodiment.

[0037] Specific implementation method nine: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the eighth embodiment is that the top of the front end of the loading and fixing seat 31 is processed with a first limiting groove that cooperates with the first limiting block, and the top of the front end of the loading and fixing seat 31 is processed with a second limiting groove that cooperates with the second limiting block. The other components and connection methods are the same as those of the eighth embodiment.

[0038] Specific implementation method ten: Combination Figures 1 to 7 This embodiment is described. The difference between this embodiment and the ninth embodiment is that the push block 34 and the other ends of the two bellows 33 are fixed by welding. The other components and connection methods are the same as those of the ninth embodiment.

[0039] In combination with the description of specific embodiments seven to ten, the loading fixing seat 31 is used to be connected and fixed with the lower mold body 2. At the same time, a accommodating space for the bellows 33 is provided in the loading fixing seat 31. The bellows 33 is connected to the external air supply unit through the vent 35. High-pressure gas is filled into the bellows 33 through the external air supply unit, so that the bellows 33 can be axially extended to provide lateral loading force. Under the action of the lateral loading force, the bellows 33 drives the push block 34 to contact the workpiece and cooperate with the small fillet feature base 25 in the lower mold body 2 to form the workpiece. When the push block 34 forms the workpiece, compressive stress is generated instead of tensile stress generated during traditional mold closing, which can effectively prevent the workpiece from cracking when the small fillet feature part is formed.

[0040] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0041] How it works

[0042] When the present application is used, the upper mold body 1 is first connected to the pressure head of the press through the upper mold base 12, and the lower mold body 2 is connected to the working platform of the press through the lower mold base 22, and the upper mold guide groove 14 and the lower mold guide block 24 are accurately aligned up and down, and the thermocouple is inserted into the upper mold temperature measuring hole 11 and the lower mold temperature measuring hole 21, which is responsible for real-time monitoring of the upper and lower mold temperatures, accurate temperature control, and ensuring the forming process. The loading fixed seat 31 and the limit assembly 32 in the side loading unit 3 are respectively installed on the upper mold body 1 and the lower mold body 2, and the limit assembly 32 is used to cooperate with the loading fixed seat 31. When the limit assembly 32 contacts the loading fixed seat 31, it indicates that the upper mold body 1 and the lower mold body 2 are completely molded, and the bellows 33 and the push block 34 are installed in the loading fixed seat 31, and it is ensured that the push block 34 is set corresponding to the small fillet feature base 25. The surface of the push block 34 on the side in contact with the workpiece must be consistent with the surface required for the final forming, and the bellows 33 is connected to the external air supply unit;

[0043] Before hot stamping the workpiece, the mold needs to be heated. After the mold is heated, the sheet to be formed is placed in the mold, and the press is controlled to drive the upper mold body 1 to move downward until it is closed with the lower mold body 2. Under the action of hot pressing, the middle surface features of the part are formed, while the small rounded corner features on both sides are not completely formed. At this time, high-pressure gas is introduced into the bellows 33 through the external air supply unit to make the bellows 33 expand and stretch, driving the push block 34 to move. The push block 34 presses the sheet until the mold is attached and finally forms the required part rounded corner features.

Claims

1. A hot stamping die with a lateral gas pressure loading device, the hot stamping die comprising an upper die body (1) and a lower die body (2), the upper die body (1) being buckled on the lower die body (2), characterized in that: A side loading unit (3) is also provided on both sides of the hot stamping die, respectively; a limiting portion of each side loading unit (3) is mounted on the upper die body (1); a working portion of each side loading unit (3) is mounted on the lower die body (2); and the working portion of each side loading unit (3) cooperates with the lower die body (2) to realize stamping of small rounded corner features on the edge of a workpiece.

2. The hot stamping die with a lateral gas pressure loading device according to claim 1, characterized in that: An upper die seat (12) is provided on the top of the upper die body (1), the upper die seat (12) and the upper die body (1) are integrally formed, the upper die body (1) is detachably connected to the pressure end of the press through the upper die seat (12), and a plurality of upper die temperature measuring holes (11) are processed on the side of the upper die body (1).

3. The hot stamping die with a lateral gas pressure loading device according to claim 1, characterized in that: An upper die hoisting assembly is provided on both sides of the upper die main body (1), each upper die hoisting assembly comprises two upper die hoisting protrusions (13), the two upper die hoisting protrusions (13) are symmetrically arranged along the center line of the length direction of the upper die main body (1), and one end of each upper die hoisting protrusion (13) is fixedly connected to the upper die main body (1).

4. The hot stamping die with a lateral gas pressure loading device according to claim 3, characterized in that: A lower die seat (22) is provided at the bottom of the lower die body (2); the lower die seat (22) and the lower die body (2) are integrally formed; the lower die body (2) is detachably connected to the working platform of the press through the lower die seat (22); and a plurality of lower die temperature measuring holes (21) are processed on the side of the lower die body (2).

5. The hot stamping die with a lateral gas pressure loading device according to claim 4, characterized in that: A lower die hoisting assembly is provided on each side of the lower die main body (2), each lower die hoisting assembly comprises two lower die hoisting protrusions (23), the two lower die hoisting protrusions (23) are symmetrically arranged along the center line of the length direction of the lower die main body (2), and one end of each lower die hoisting protrusion (23) is fixedly connected to the lower die main body (2).

6. The hot stamping die with a lateral gas pressure loading device according to claim 5, characterized in that: At least one guide assembly is provided on the hot stamping die, and the guide assembly comprises an upper die guide groove (14) and a lower die guide block (24); the upper die guide groove (14) is arranged on one side of the upper die body (1), and the upper die guide groove (14) and the upper die body (1) are integrally formed; the lower die guide block (24) is arranged on one side of the lower die body (2), and the lower die guide block (24) is arranged directly below the upper die guide groove (14), and the lower die guide block (24) and the lower die body (2) are integrally formed; the upper die body (1) is accurately molded with the lower die body (2) through the cooperation of the upper die guide groove (14) and the lower die guide block (24).

7. The hot stamping die with a lateral gas pressure loading device according to claim 6, characterized in that: The side loading unit (3) comprises a loading fixing seat (31), a limiting assembly (32), a push block (34) and two bellows (33); the loading fixing seat (31) is arranged on one side of the lower mold body (2) and is detachably connected to the lower mold body (2) by bolts; the limiting assembly (32) is arranged above the loading fixing seat (31); and the limiting assembly (32) is arranged on one side of the upper mold body (1) and is detachably connected to the upper mold body (1) by bolts; the two bellows (33) are symmetrically arranged in the loading fixing seat (31) along the center line of the length extension direction of the loading fixing seat (31); and the axial extension direction of the bellows (33) is parallel to the loading fixing seat (31). The width extension direction of the fixing seat (31) is arranged in the same direction, one end of each bellows (33) is connected to a vent hole (35) pre-processed on the loading fixing seat (31), a push block (34) is arranged on the other end of the two bellows (33), and the push block (34) and the two bellows (33) are fixedly connected, the push block (34) and the small rounded corner feature base (25) in the lower mold body (2) are arranged in a corresponding manner, and the push block (34) is driven by the bellows (33) to extrude the workpiece and make the workpiece closely contact with the small rounded corner feature base (25) on the side of the lower mold body (2), thereby realizing stamping and forming of the small rounded corner feature at the edge of the workpiece.

8. The hot stamping die with a lateral gas pressure loading device according to claim 7, characterized in that: The limit assembly (32) comprises a first limit block and a second limit block, wherein the first limit block is located above the front end of the loading fixed seat (31) and is detachably connected to the upper die body (1) via bolts, and the second limit block is located above the rear end of the loading fixed seat (31) and is detachably connected to the upper die body (1) via bolts.

9. The hot stamping die with a lateral gas pressure loading device according to claim 8, characterized in that: A first limiting groove cooperating with a first limiting block is processed on the front top of the loading fixing seat (31), and a second limiting groove cooperating with a second limiting block is processed on the front top of the loading fixing seat (31).

10. The hot stamping die with a lateral gas pressure loading device according to claim 9, characterized in that: The push block (34) and the other ends of the two bellows (33) are fixed by welding.

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