Hot stamping die with lateral air pressure loading device

Abstract

The utility model relates to a hot stamping die with lateral air pressure loading device belongs to stamping forming technical field, in order to solve the problem that the existing hot stamping forming die is used to the small fillet and complex shape forming of workpiece and is easy to appear the cracking, the hot stamping die of the utility model includes upper die main part and lower die main part, and the upper die main part is buckled on the lower die main body and is set up with the lower die main body and is split, and the both sides of the hot stamping die are equipped with a side loading unit respectively, and the limiting portion of each side loading unit is installed on the upper die main part, and the working portion of each side loading unit is installed on the lower die main body, and the working portion of each side loading unit cooperates with the lower die main body and realizes the stamping forming to the small fillet feature of workpiece edge, the utility model is mainly used for the die of the hot stamping forming of workpiece plate material with small fillet feature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of punch forming, in particular to a hot stamping die with a lateral gas pressure loading device. BACKGROUND

[0002] The hot stamping die is a kind of die specially used for punch forming of metal materials under high temperature conditions, which produces parts with high strength and high precision by heating the metal materials to a certain temperature and then punch forming in a special die, and is widely used in automobile industry, aviation, national defense and some industries requiring high-performance structural parts.

[0003] The traditional hot stamping forming die is directly formed by one-time die closing, which can directly form parts with high shape and size precision, but when forming some small fillet shapes, tensile stress may be involved, and cracking may occur during the forming process. Therefore, it is very practical to develop a hot stamping die with a lateral gas pressure loading device to improve the forming quality of hot stamping. SUMMARY

[0004] The present application is to solve the problem of cracking when using the existing hot stamping forming die to form small fillets and complex shapes of workpieces, and to provide a hot stamping die with a lateral gas pressure loading device;

[0005] A hot stamping die with a lateral gas pressure loading device, the hot stamping die comprises an upper die body and a lower die body, the upper die body is buckled on the lower die body, and the hot stamping die is further provided with one side loading unit on each side, the limiting part of each side loading unit is installed on the upper die body, the working part of each side loading unit is installed on the lower die body, and the working part of each side loading unit cooperates with the lower die body to realize punch forming of the small fillet features at the edge of the workpiece;

[0006] Further, the top of the upper die body is provided with an upper die seat, the upper die seat is integrally formed with the upper die body, the upper die body is detachably connected with the pressing end of the press machine through the upper die seat, and the side of the upper die body is processed with a plurality of upper die temperature measuring holes;

[0007] Further, the two sides of the upper die body are respectively provided with an upper die hoisting assembly, each upper die hoisting assembly comprises 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 body, and one end of each upper die hoisting protrusion is fixedly connected with the upper die body;

[0008] Further, the bottom of the lower die body is provided with a lower die seat, the lower die seat is integrally formed with the lower die body, the lower die body is detachably connected with the working platform of the press machine through the lower die seat, and the side of the lower die body is processed with a plurality of lower die temperature measuring holes;

[0009] Further, two sides of the lower die body are respectively provided with a lower die hoisting assembly, 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 body, and one end of each lower die hoisting protrusion is fixedly connected with the lower die body;

[0010] Further, at least one guide assembly is arranged on the hot stamping die, the guide assembly comprises 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 is integrally formed with the upper die body, the lower die guide block is arranged on one side of the lower die body and 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 matched with the lower die body through cooperation of the upper die guide groove and the lower die guide block;

[0011] Further, the side loading unit comprises 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 die body and is detachably connected with the lower die body through bolts, the limiting assembly is arranged above the loading fixing seat and is arranged on one side of the upper die body and is detachably connected with the upper die body through 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 axis 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 bellow is in communication with a pre-processed air hole of the loading fixing seat, the push block is arranged on the other end of the two bellows, and the push block is fixedly connected with the two bellows, the push block is arranged in cooperation with the small round corner feature base in the lower die body, the push block is driven by the bellows to extrude the workpiece and make the workpiece tightly contact with the small round corner feature base on the side of the lower die body, so that the stamping forming of the small round corner feature of the workpiece edge is realized;

[0012] Further, the limiting assembly comprises a first limiting block and a second limiting block, the first limiting block is arranged above the front end of the loading fixing seat and is detachably connected with the upper die body through bolts, and the second limiting block is arranged above the rear end of the loading fixing seat and is detachably connected with the upper die body through bolts;

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

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

[0015] The beneficial effects of the present application relative to the prior art are:

[0016] The hot stamping die with a lateral gas pressure loading device provided by the application adopts a mode of limiting die closing and then loading from the lateral side to form the small corner feature part of the workpiece, and can well convert the tensile stress generated in traditional die closing forming into compressive stress, so as to effectively solve the problems of forming the small corner feature and workpiece cracking caused by complex shape and tensile stress in the hot stamping process; at the same time, the lateral loading pressure used by the application when forming the small corner feature part is gas pressure, and compared with direct forming by a press, the pressure is more controllable, the strain rate is smaller, and the forming is more gentle, which has a good effect on solving the cracking problem. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the hot stamping die according to the application;

[0018] Figure 2 The figure is a schematic diagram of the hot stamping die according to the application;

[0019] Figure 3 The figure is a schematic diagram of the die closing of the hot stamping die according to the application;

[0020] Figure 4 The figure is a schematic diagram of the structure of the side loading unit in the hot stamping die according to the application;

[0021] Figure 5 The figure is a schematic diagram of the structure of the side loading unit in the hot stamping die according to the application;

[0022] Figure 6 The figure is a schematic diagram of the working time of the hot stamping die according to the application

[0023] Figure 7 The figure is a schematic diagram of the forming of the small corner feature part by the hot stamping die according to the 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 corner feature base, 3 is a side loading unit, 31 is a loading fixing seat, 32 is a limiting assembly, 33 is a bellows, 34 is a push block, 35 is a vent hole, and 4 is a workpiece plate. DETAILED DESCRIPTION

[0025] Specific implementation one: combined Figures 1 to 7The present embodiment provides a hot stamping die with a lateral gas pressure loading device. The hot stamping die includes an upper die body 1 and a lower die body 2. The upper die body 1 is fastened on the lower die body 2 and is arranged in combination with the lower die body 2. The hot stamping die is further provided with a side loading unit 3 on each side. The limiting part of each side loading unit 3 is installed on the upper die body 1. 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 forming of the small round corner feature at the edge of the workpiece.

[0026] In the present embodiment, the side loading unit 3 is arranged on the side of the hot stamping die to realize stamping forming of the small round corner feature on both sides of the workpiece. Compared with the traditional hot stamping one-time die closing direct forming method, the stamping die provided by the present application can change the tensile stress of the special small round corner feature during forming into compressive stress, greatly improving the success of the small round corner feature forming, and avoiding the occurrence of workpiece cracking. The surface of the upper die body 1 and the lower die body 2 is nitrided to improve the service life of the die.

[0027] Specific implementation method two: in combination with Figures 1 to 7 The present embodiment is different from the specific implementation method one in that the top of the upper die body 1 is provided with an upper die seat 12. The upper die seat 12 is integrally formed with the upper die body 1. The upper die body 1 is detachably connected with the pressing end of the press through the upper die seat 12. The side of the upper die body 1 is processed with a plurality of upper die temperature measuring holes 11. The other components and connection methods are the same as those of the specific implementation method one.

[0028] Specific implementation method three: in combination with Figures 1 to 7 The present embodiment is different from the specific implementation method two in that the two sides of the upper die body 1 are respectively provided with an upper die hoisting assembly. Each upper die hoisting assembly includes 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 body 1. One end of each upper die hoisting protrusion 13 is fixedly connected with the upper die body 1. The other components and connection methods are the same as those of the specific implementation method two.

[0029] In combination with the specific implementation method two and the specific implementation method three, the upper die seat 12 is detachably connected with the pressing end of the press through the pressing plate and the bolt structure. Generally, four upper die temperature measuring holes 11 are arranged. 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. 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 hole 11 is used in cooperation with the thermocouple to realize real-time monitoring of the temperature of the upper die, accurate temperature control, and guarantee of the forming process. The upper die hoisting protrusion 13 is used for hoisting and transportation in cooperation with the sling.

[0030] Specific implementation method four: Combination Figures 1 to 7 This embodiment differs from Specific Embodiment Three in that a lower mold base 22 is provided at the bottom of the lower mold body 2. The lower mold base 22 is integrally formed with the lower mold body 2. The lower mold body 2 is detachably connected to the working platform of the press through the lower mold base 22. Multiple lower mold temperature measuring holes 21 are machined on the side of the lower mold body 2. Other components and connection methods are the same as in Specific Embodiment Three.

[0031] Specific Implementation Method Five: Combining Figures 1 to 7 This embodiment differs from specific embodiment four in that a lower mold body 2 has a lower mold lifting assembly on each side. Each lower mold lifting assembly includes two lower mold lifting protrusions 23, which are symmetrically arranged along the center line of the lower mold body 2's length direction. One end of each lower mold lifting protrusion 23 is fixedly connected to the lower mold body 2. Other components and connection methods are the same as in specific embodiment four.

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

[0033] Specific Implementation Method Six: Combination Figures 1 to 7 This embodiment differs from Specific Embodiment Five in that the hot stamping die is equipped with at least one guide component. The guide component includes an upper die guide groove 14 and a lower die guide block 24. The upper die guide groove 14 is located on one side of the upper die body 1 and is integrally formed with the upper die body 1. The lower die guide block 24 is located on one side of the lower die body 2, directly below the upper die guide groove 14, and is integrally formed with the lower die body 2. The upper die body 1 achieves accurate mold closing 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 in Specific Embodiment Five.

[0034] In this embodiment, the guide component can position and guide the movement trajectory between the upper mold guide groove 14 and the lower mold guide block 24, thereby ensuring the accuracy of mold closing between the upper mold guide groove 14 and the lower mold guide block 24.

[0035] Specific implementation seven: combined Figures 1 to 7 In this embodiment, the difference between this embodiment and specific implementation six is that the side loading unit 3 includes 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 die body 2 and is detachably connected with the lower die body 2 through 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 die body 1 and is detachably connected with the upper die body 1 through 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 axis extension direction of the bellows 33 is arranged in the same direction as the width extension direction of the loading fixing seat 31, one end of each bellows 33 is in communication with a pre-processed vent hole 35 on the loading fixing seat 31, the push block 34 is arranged on the other end of the two bellows 33, and the push block 34 is fixedly connected with the two bellows 33, the push block 34 is correspondingly arranged with the small round corner feature base 25 in the lower die body 2, and the push block 34 is driven by the bellows 33 to extrude the workpiece and make the workpiece tightly contact with the small round corner feature base 25 on the side of the lower die body 2, so as to realize the stamping forming of the small round corner feature on the edge of the workpiece. The other components and connection modes are the same as those of specific implementation six.

[0036] Specific implementation eight: combined Figures 1 to 7 In this embodiment, the difference between this embodiment and specific implementation seven is that the limiting assembly 32 includes a first limiting block and a second limiting block, the first limiting block is located above the front end of the loading fixing seat 31, and the first limiting block is detachably connected with the upper die body 1 through bolts, the second limiting block is located above the rear end of the loading fixing seat 31, and the second limiting block is detachably connected with the upper die body 1 through bolts. The other components and connection modes are the same as those of specific implementation seven.

[0037] Specific implementation nine: combined Figures 1 to 7 In this embodiment, the difference between this embodiment and specific implementation eight is that a first limiting groove matched with the first limiting block is processed on the top of the front end of the loading fixing seat 31, and a second limiting groove matched with the second limiting block is processed on the top of the front end of the loading fixing seat 31. The other components and connection modes are the same as those of specific implementation eight.

[0038] Specific implementation ten: combined Figures 1 to 7 In this embodiment, the difference between this embodiment and specific implementation nine is that the push block 34 and the other end of the two bellows 33 are both fixedly connected by welding. The other components and connection modes are the same as those of specific implementation nine.

[0039] As described in the seventh embodiment to the tenth embodiment, the loading fixture 31 is used to connect and fix the lower die body 2, and the loading fixture 31 is provided with a receiving space of the bellows 33, the bellows 33 is connected with the external gas supply unit through the air hole 35, the high-pressure gas is filled into the bellows 33 through the external gas supply unit, the bellows 33 can be axially extended to provide the lateral loading force, under the action of the lateral loading force, the bellows 33 drives the push block 34 to contact the workpiece and cooperates with the small corner feature base 25 in the lower die body 2 to realize the forming of the workpiece, when the push block 34 forms the workpiece, the generated stress is the compressive stress, not the tensile stress generated in the traditional die assembly, which can effectively prevent the workpiece from cracking during the forming of the small corner feature part.

[0040] The present application has been disclosed in the above-mentioned preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art can make some changes or modifications to the above-mentioned disclosed structure and technical content without departing from the technical solution of the present application to obtain equivalent embodiments, but any simple modification, equivalent change and modification made to the above-mentioned embodiments according to the technical essence of the present application without departing from the technical solution of the present application shall still fall within the scope of the technical solution of the present application.

[0041] Working principle

[0042] In use, the upper die body 1 is connected with the pressing head of the press machine through the upper die seat 12, the lower die body 2 is connected with the working platform of the press machine through the lower die seat 22, the upper die guide groove 14 and the lower die guide block 24 are accurately positioned, the thermocouple is inserted into the upper die temperature measuring hole 11 and the lower die temperature measuring hole 21 to monitor the temperature of the upper and lower dies in real time, accurately control the temperature and ensure the forming process, the loading fixture 31 and the limiting assembly 32 of the side loading unit 3 are respectively installed on the upper die body 1 and the lower die body 2, the limiting assembly 32 is used to cooperate with the loading fixture 31, when the limiting assembly 32 contacts with the loading fixture 31, it indicates that the upper die body 1 and the lower die body 2 are completely die assembled, the bellows 33 and the push block 34 are installed in the loading fixture 31, and the push block 34 is correspondingly arranged with the small corner feature base 25, the side surface of the push block 34 in contact with the workpiece is consistent with the final forming requirement, and the bellows 33 is communicated with the external gas supply unit.

[0043] Before the workpiece is hot stamping formed, the mold needs to be heated, and after the mold is heated, the sheet to be formed is put into the mold, and the press is controlled to drive the upper mold body 1 to move downward until it is combined with the lower mold body 2. Under the action of hot pressing, the intermediate surface features of the part are formed, and the small round corner features on both sides are not completely formed. At this time, high-pressure gas is introduced into the bellows 33 through the external gas supply unit, the bellows 33 is inflated and elongated, the push block 34 is driven to move, and the push block 34 makes the sheet to be formed until it is finally formed into the required part round corner feature.

Claims

1. A hot stamping die having 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 clamped to the lower die body (2), characterized in that: Two sides of the hot stamping die are respectively provided with a side loading unit (3), the limiting part of each side loading unit (3) is installed on the upper die body (1), the working part of each side loading unit (3) is installed on the lower die body (2), and the working part of each side loading unit (3) is matched with the lower die body (2) to realize stamping forming on the small round corner feature of the edge of the workpiece. 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 die body (2) and is detachably connected with the lower die body (2) through 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 die body (1) and is detachably connected with the upper die body (1) through 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 axis extension direction of the bellows (33) is arranged in the same direction as the width extension direction of the loading fixing seat (31), one end of each bellows (33) is communicatively arranged with a pre-processed air hole (35) on the loading fixing seat (31), the push block (34) is arranged on the other end of the two bellows (33), and the push block (34) is fixedly connected with the two bellows (33), the push block (34) is correspondingly matched with the small round corner feature base (25) in the lower die body (2), the push block (34) is driven by the bellows (33) to extrude the workpiece and make the workpiece closely contact with the small round corner feature base (25) on the side of the lower die body (2), so that the stamping forming on the small round corner feature of the edge of the workpiece is realized. The limiting assembly (32) comprises a first limiting block and a second limiting block, the first limiting block is located above the front end of the loading fixing seat (31), and the first limiting block is detachably connected with the upper die body (1) through bolts, the second limiting block is located above the rear end of the loading fixing seat (31), and the second limiting block is detachably connected with the upper die body (1) through bolts.

2. A hot-pressing die having a side air pressure loading device according to claim 1, characterized in that: The top of the upper die body (1) is provided with an upper die seat (12), the upper die seat (12) is integrally formed with the upper die body (1), the upper die body (1) is detachably connected with the pressing end of the press through the upper die seat (12), and the side of the upper die body (1) is processed with a plurality of upper die temperature measuring holes (11).

3. A hot-pressing die having a side air pressure loading device according to claim 1, characterized in that: The two sides of the upper die body (1) are respectively provided with an upper die hoisting assembly, 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 body (1), and one end of each upper die hoisting protrusion (13) is fixedly connected with the upper die body (1).

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

5. A hot-pressing die having a side air pressure loading device according to claim 4, characterized in that: Two lower die hoisting assemblies are arranged on the two sides of the lower die body (2), each of which comprises two lower die hoisting protrusions (23) arranged symmetrically along the center line of the length direction of the lower die body (2), and one end of each of the lower die hoisting protrusions (23) is fixedly connected with the lower die body (2).

6. A hot-pressing die having a side air pressure loading device according to claim 5, characterized in that: The hot stamping die is provided with at least one guide assembly, 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 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 is arranged directly below the upper die guide groove (14), and the lower die guide block (24) is integrally formed with the lower die body (2), so that the upper die body (1) is accurately closed with the lower die body (2) through cooperation of the upper die guide groove (14) and the lower die guide block (24).

7. A hot-pressing die having a side air pressure loading device according to claim 6, characterized in that: The front end top of the loading fixing seat (31) is processed with a first limiting groove matched with the first limiting block, and the front end top of the loading fixing seat (31) is processed with a second limiting groove matched with the second limiting block.

8. A hot-pressing die having a side air pressure loading device according to claim 7, characterized in that: The push block (34) and the other ends of the two bellows (33) are all fixed by welding.

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