Stamping die for metal structure die casting

Abstract

The invention relates to the technical field of stamping dies, in particular to a stamping die for a metal structure die casting, which comprises a top seat, a movable die, a die holder, a fixed die and a hydraulic cylinder, and further comprises a base, a sealing plate, a limiting ring, a butt joint seat, a supporting seat and a lifting seat, an inner groove, a sliding groove and a limiting groove are formed in the base. At the beginning of stamping, the aluminum alloy die casting is supported from the inner side of the stamping groove, and in the stamping process after the die base makes contact with the aluminum alloy die casting, the butt joint base moves downwards to rapidly drive the lifting base to move downwards, air in the stamping groove is pumped out, and the aluminum alloy die casting is gradually attached to the stamping groove; the problem that when a deeper groove is formed in the automobile aluminum alloy door plate formed through a die-casting technology through stamping, due to the fact that the elasticity modulus of an aluminum alloy material is small, the aluminum alloy material bears extra tensile stress due to springback in the stamping process, and the edge is torn is solved.

Description

Technical Field

[0001] This invention relates to the field of stamping die technology, specifically to a stamping die for die casting metal structures. Background Technology

[0002] Die-cast metal structures are metal structural parts obtained by filling molten metal into a die-casting mold cavity at high speed under high pressure, and then cooling and solidifying within the mold. While die casting can produce high-precision castings, automotive structural parts made of aluminum alloys have extremely high precision requirements that are difficult to achieve using die casting alone. Furthermore, after die casting, complex bending, flanging, and stretching shape features are required. Achieving these in the die-casting mold would significantly increase the complexity of the mold and manufacturing costs. To reduce production costs, after the aluminum alloy automotive die-cast parts are formed, a stamping die is typically used to perform secondary processing to achieve the final complex product shape requirements.

[0003] When stamping automotive aluminum alloy door panels using stamping dies, deep grooves need to be stamped out because components such as door locks, hinges, and window regulators need to be installed on the inner door panel. During stamping, the groove depth is significant, but the elastic modulus of aluminum alloy is only one-third that of steel. This makes it prone to springback during stamping, subjecting the aluminum alloy to additional tensile stress. When this stress exceeds the material's yield strength, the edges are easily torn, making it difficult to guarantee stamping quality.

[0004] To address this, a stamping die for die-casting metal structures is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a stamping die for metal structure die castings. By providing support to the aluminum alloy die casting from the inside of the stamping groove at the initial stamping stage, and during the stamping process after the die base contacts the aluminum alloy die casting, the lowering seat rapidly moves the lifting seat downwards to extract air from the stamping groove, allowing the aluminum alloy die casting to gradually fit into the stamping groove. This solves the problem of edge tearing when forming deep grooves in automotive aluminum alloy door panels using die casting, due to the low elastic modulus of the aluminum alloy material and the additional tensile stress caused by springback during stamping. This invention effectively avoids edge tearing during stamping of automotive aluminum alloy door panels, significantly improving the stamping quality of automotive aluminum alloy door panels.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A stamping die for die-casting metal structures includes a top seat, a moving die, a die base, a fixed die, and a hydraulic cylinder. The moving die is installed at the bottom of the top seat, the die base is installed at the bottom of the moving die, and the fixed die is located below the moving die. It also includes a base, a sealing plate, a limiting ring, a mating seat, a support seat, and a lifting seat. The fixed die is installed on the surface of the base. The hydraulic cylinder is installed between the top seat and the base. When the hydraulic cylinder retracts, it drives the top seat, the moving die, and the die base to move downwards together. The surface of the fixed die has a die-casting part placement groove and a stamping groove, with the stamping groove being lower than the die-casting part placement groove. The base has an inner groove, a sliding groove, and a limiting groove inside. The surface of the base has a through hole. A fitting is installed between the inner groove and the limiting groove. The transmission gear has a sealing plate that fits against the edge of the inner groove. The limiting ring is installed on the surface of the base, and the through hole is located inside the limiting ring. The docking seat is installed at the bottom of the top seat, and the docking seat slides with the limiting ring. The lifting seat is slidably disposed between the slide groove and the limiting groove, and the lifting seat is connected to the docking seat through the transmission gear. The support seat is disposed in the stamping groove, and the bottom of the support seat extends through the fixed mold into the inner groove. The docking seat moves down when the hydraulic cylinder retracts, and the docking seat drives the lifting seat to move down faster than the docking seat. When the lifting seat moves down, the space above it increases, and the air in the stamping groove is drawn into the space above the lifting seat through the support seat.

[0008] In the above scheme, during the stamping operation, according to Figure 3 and Figure 4 The position of the lifting seat changes. When the hydraulic cylinder retracts, it drives the top seat and moving mold to move downwards. The downward stroke of the docking seat is consistent with the retraction stroke of the hydraulic cylinder. However, the downward stroke of the docking seat is amplified by the transmission gear. This makes the moving stroke of the lifting seat greater than the stroke of the moving mold when the moving mold and the fixed mold are in contact. Combined with the fact that the width of the lifting seat is much larger than the width of the stamping groove, the sliding space above the lifting seat gradually increases as the lifting seat moves downwards during the stamping process. Initially, the surface of the lifting seat is in contact with the bottom of the fixed mold. Therefore, as the lifting seat moves downwards, the pressure in the sliding space above the lifting seat will decrease significantly. At this time, the air in the stamping groove can be drawn into this space through the support seat. The automotive aluminum alloy door panel part, after being in contact with the fixed mold, remains tightly in contact with the fixed mold under pressure, effectively preventing the automotive aluminum alloy door panel from rebounding and causing the stamped part to bear additional tensile stress and tear.

[0009] Preferably, the stamping groove is located directly below the mold base, and when the moving mold and the fixed mold are in contact, the top of the support base is flush with the bottom surface of the stamping groove.

[0010] Preferably, the docking seat includes a circular seat, a long rod, and a plug rod. The circular seat is installed at the bottom of the top seat, the long rod is installed inside the circular seat and is coaxial with the circular seat, and the plug rod is installed at the bottom of the long rod.

[0011] Preferably, the inner circumference of the annular seat and the outer circumference of the limiting ring are in sliding sealing contact, and the outer circumference of the long rod is in sliding sealing contact with the inner circumference of the limiting ring.

[0012] Preferably, the insertion rod has a toothed groove on the side near the transmission tooth, and the toothed groove is adapted to the transmission tooth.

[0013] Preferably, the support base includes a horizontal plate and a vertical plate. The horizontal plate is disposed in a stamping groove, and the vertical plate is connected to the bottom of the horizontal plate. In the unstamped state, the surface of the horizontal plate is in contact with the bottom surface of the die-cast part placed in the stamping groove, and the bottom of the vertical plate is in contact with the surface of the lifting base.

[0014] Preferably, the horizontal plate has multiple parallel connecting holes inside, the vertical plate has connecting grooves that communicate with the connecting holes inside, and the bottom of the vertical plate has a side groove.

[0015] Preferably, the lifting seat includes a bending plate and a sliding column. The bending plate is slidably fitted in a sliding groove, and the sliding column is installed on the side wall of the bending plate and is slidably and sealingly fitted in a limiting groove. The sliding column meshes with a transmission gear.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the stamping process of automotive aluminum alloy door panels formed by die casting, the lifting seat initially fits against the fixed mold, supporting the support seat. The support seat then stably supports the aluminum alloy die casting. As the stamping process proceeds, the lifting seat gradually moves downward, allowing the aluminum alloy die casting to gradually come into contact with the fixed mold. Furthermore, the pressure prevents the aluminum alloy die casting from springing back after it fits against the fixed mold, effectively avoiding the problem of the aluminum alloy die casting being torn due to excessive tensile stress caused by springback. This effectively ensures the quality of the stamped automotive aluminum alloy door panels.

[0018] 2. The support seat, initially supported by the lifting seat and located within the stamping groove, supports the aluminum alloy die casting from the center of the stamping area. During stamping, this effectively prevents the center of the stamping area from moving down too quickly, and avoids deformation of adjacent areas due to deformation of the stamping area. This ensures the stamping accuracy of the aluminum alloy die casting. During the stamping process, air can also be transferred to the space above the lifting seat in conjunction with the lifting seat movement. The negative pressure is used to adsorb the bottom of the stamped aluminum alloy die casting, further avoiding the problem of excessive tensile stress and tearing caused by the low elastic modulus of the aluminum alloy die casting, which is prone to springback.

[0019] 3. By setting up a docking seat, transmission gears, and lifting seat, the transmission ratio is increased through the transmission gears when the hydraulic cylinder retracts, so that the displacement stroke of the lifting seat is greater than the retraction stroke of the hydraulic cylinder. This results in a larger volume change in the space above the lifting seat in the limiting groove, which is conducive to forming a larger pressure change. The pressure change is used to form a better adsorption effect on the stamped aluminum alloy die casting, avoiding the aluminum alloy from springing back after stamping and failing to guarantee the stamping quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention in its stamping state;

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention in its unstamped state;

[0022] Figure 3 This is a cross-sectional view of the present invention in its unstamped state;

[0023] Figure 4 This is a cross-sectional view of the present invention in its stamping state;

[0024] Figure 5 This is a schematic diagram of the structure of the base of the present invention;

[0025] Figure 6 This is a schematic diagram illustrating the state changes of the limiting ring and the docking seat during the stamping process of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the long rod of the present invention;

[0027] Figure 8 This is a schematic diagram of the support base of the present invention.

[0028] In the diagram: 1. Top seat; 2. Moving mold; 21. Mold base; 3. Fixed mold; 31. Die casting placement slot; 32. Stamping slot; 4. Base; 41. Inner groove; 42. Sliding groove; 43. Limiting groove; 44. Through hole; 45. Transmission gear; 5. Sealing plate; 6. Hydraulic cylinder; 7. Limiting ring; 8. Connecting seat; 81. Circular seat; 82. Long rod; 83. Insert rod; 831. Gear groove; 9. Support seat; 91. Horizontal plate; 911. Connecting hole; 92. Vertical plate; 921. Connecting groove; 922. Side groove; 10. Lifting seat; 101. Bending plate; 102. Sliding column. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 8 This invention provides a stamping die for die-casting metal structures, the technical solution of which is as follows:

[0031] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5A stamping die for die-casting metal structures includes a top seat 1, a moving die 2, a die base 21, a fixed die 3, and a hydraulic cylinder 6. The moving die 2 is installed at the bottom of the top seat 1, the die base 21 is installed at the bottom of the moving die 2, and the fixed die 3 is located below the moving die 2. It also includes a base 4, a sealing plate 5, a limiting ring 7, a mating seat 8, a support seat 9, and a lifting seat 10. The fixed die 3 is installed on the surface of the base 4. The hydraulic cylinder 6 is installed between the top seat 1 and the base 4. When the hydraulic cylinder 6 retracts, it causes the top seat 1, the moving die 2, and the die base 21 to move downwards together. The surface of mold 3 has a die-casting part placement groove 31 and a stamping groove 32. The shape of the die-casting part placement groove 31 is set according to the shape of the automotive aluminum alloy door panel to be stamped. The stamping groove 32 is lower than the die-casting part placement groove 31, and the shape of the stamping groove 32 is consistent with the spatial shape involved in installing components such as car door locks. The base 4 has an inner groove 41, a sliding groove 42, and a limiting groove 43 inside. There are two inner grooves 41, and the sliding groove 42 is opened at the center of the surface of the base 4. The two inner grooves 41 are symmetrically distributed about the sliding groove 42. The number of slots 43 is set to four, distributed in pairs on both sides of the slide groove 42. The surface of the base 4 is provided with four through holes 44, the bottom of which is connected to the inner groove 41. The four through holes 44 are arranged in a rectangular array about the slide groove 42. A transmission gear 45 is installed between the inner groove 41 and the limiting slot 43. The sealing plate 5 is attached to the edge of the inner groove 41. The limiting ring 7 is installed on the surface of the base 4, and the through holes 44 are located inside the limiting ring 7. The docking seat 8 is installed at the bottom of the top seat 1, and the docking seat 8 is connected to the inner groove 42. The limiting ring 7 is slidably engaged, and the lifting seat 10 is slidably disposed between the slide groove 42 and the limiting groove 43. The lifting seat 10 is connected to the docking seat 8 through the transmission gear 45. The transmission gear 45 consists of three gears, which can be divided into large gears and small gears according to their diameter. There are two small gears, which mesh with each other to change the rotation direction of the large gear, so that when the docking seat 8 moves down, it drives the lifting seat 10 to move down at the same time. The modules of the large gear and the small gear are equal, and the number of teeth of the large gear is 1 of the number of teeth of the small gear.Five times, the shafts of the two gears are connected by chain drive. The sprocket diameter of the large gear is the same as that of the small gear. The small gear meshes with the docking seat 8, while the large gear meshes with the lifting seat 10. Under the action of the tooth ratio of the large gear and the small gear in the transmission gear 45, the displacement of the docking seat 8 is amplified and acts on the lifting seat 10. The inner groove 41 provides vertical movement limit for the lifting seat 10, and the limiting groove 43 can guide and limit the lifting seat 10. The support seat 9 is set in the stamping groove 32, and the bottom of the support seat 9 extends through the fixed mold 3 into the inner groove 41. The docking seat 8 moves down when the hydraulic cylinder 6 retracts, and the docking seat 8 drives the lifting seat 10 to move down faster than the docking seat 8. When the lifting seat 10 moves down, the space above it increases, and the air in the stamping groove 32 is drawn into the space above the lifting seat 10 through the support seat 9. The docking seat 8 and the limiting ring 7 are relative to each other. During displacement, the parts are in a sliding seal state. The downward movement of the docking seat 8 drives the lifting seat 10 to move downward at a faster speed than the docking seat 8. This rapid downward movement of the lifting seat 10 causes a sharp increase in the volume of the sealed space above it, resulting in a rapid decrease in pressure and the formation of negative pressure. At this time, the air inside the stamping groove 32 is "drawn" into the space above the lifting seat 10 through the channel inside the support seat 9 by this negative pressure effect. The upper stamping force deforms the aluminum alloy door panel to be stamped, while the lower negative pressure causes the aluminum alloy door panel to be stamped to "adsorb" and adhere to the inner wall of the stamping groove 32. This effectively solves the problem of the rebound force generated by the elasticity of the aluminum alloy material itself, avoiding additional tensile force during deformation. This fundamentally solves the problem of tearing at the edges of the stamped part of the aluminum alloy door panel, greatly improving the yield and quality of the stamped aluminum alloy door panel.

[0032] Reference Figure 3 and Figure 4 In one embodiment of the present invention, the stamping groove 32 is located directly below the mold base 21. When the moving mold 2 and the fixed mold 3 are in contact, the top of the support seat 9 is flush with the bottom surface of the stamping groove 32. When the moving mold 2 moves down to stamp, the stamping force it applies can act evenly and vertically on the center of the stamping area, avoiding uneven stress or unilateral fatigue of the mold caused by eccentric load. When the moving mold 2 and the fixed mold 3 are fully in contact, that is, when the stamping action is completed, the top surface of the support seat 9 is exactly flush with the bottom surface of the stamping groove 32. In the final stage of stamping, the support seat 9, which plays a supporting role, has completely given way and will not have any impact on the final forming of the automotive aluminum alloy door panel. This ensures that the final die casting can be completely and accurately filled into the preset shape of the base 4 groove, ensuring the dimensional accuracy and geometric shape of the product.

[0033] Reference Figure 6As one embodiment of the present invention, specifically, the docking seat 8 includes a circular seat 81, a long rod 82 and an insert rod 83. The circular seat 81 is installed at the bottom of the top seat 1, the long rod 82 is installed inside the circular seat 81 and is coaxially arranged with the circular seat 81, and the insert rod 83 is installed at the bottom of the long rod 82. The circular seat 81 is responsible for connection, the long rod 82 is responsible for guiding and transmitting the main body movement, and the insert rod 83 is responsible for cooperating with the transmission gear 45.

[0034] Reference Figure 6 As one embodiment of the present invention, specifically, the inner circumference of the annular seat 81 is slidably and sealed to the outer circumference of the limiting ring 7, and the outer circumference of the long rod 82 is slidably and sealed to the inner circumference of the limiting ring 7. The inner circumferential surface of the annular seat 81 and the outer circumferential surface of the limiting ring 7 form a slidably and sealed fit, and the outer circumferential surface of the long rod 82 also forms a slidably and sealed fit with the inner circumferential surface of the limiting ring 7. Through the double sealing design, when the docking seat 8 slides up and down in the limiting ring 7, it not only plays the role of precise orientation and preventing shaking, but also constitutes an effective airtight structure, preventing the air in the inner groove 41 from flowing out quickly, ensuring that the lifting seat 10 can quickly and efficiently maintain the required negative pressure environment when it moves down, and at the same time, it is beneficial for the lifting seat 10 to quickly reset when the top seat 1 moves up later. When the annular seat 81 and the limiting ring 7 are relatively displaced, when the insert rod 83 is inserted into the inner groove 41, it pushes air into the inner groove 41. The air entering the inner groove 41 will not enter the sliding groove 42.

[0035] Reference Figure 7 In one embodiment of the present invention, the insert rod 83 has a toothed groove 831 on the side near the transmission gear 45, and the toothed groove 831 meshes with the pinion in the transmission gear 45. Under the action of the toothed groove 831, the insert rod 83 can be regarded as a "rack", and the pinion in the transmission gear 45 provides power input to the rack. The gear and rack transmission has the advantages of accurate transmission ratio, smooth transmission, strong load-bearing capacity and simple structure, ensuring reliable power transmission from the docking seat 8 to the transmission gear 45, and providing a precise power source for subsequent differential transmission.

[0036] Reference Figure 8 In one embodiment of the present invention, the support base 9 specifically includes a horizontal plate 91 and a vertical plate 92. The horizontal plate 91 is disposed in the stamping groove 32, and the vertical plate 92 is connected to the bottom of the horizontal plate 91. In the unstamped state, the surface of the horizontal plate 91 is in contact with the bottom surface of the die-cast part placed in the stamping groove 32, and the bottom of the vertical plate 92 is in contact with the surface of the lifting seat 10. Before the lifting seat 10 moves down, the horizontal plate 91 is responsible for supporting the automotive aluminum alloy door panel to be stamped, avoiding unnecessary bending deformation of the automotive aluminum alloy door panel to be stamped at the beginning of stamping, laying a good foundation for subsequent smooth forming. It not only achieves effective basic support for the automotive aluminum alloy door panel to be stamped, but also ensures that the support base 9 can be precisely linked with the lifting seat 10, so that the entire support-exhaust system can work in a coordinated manner.

[0037] Reference Figure 8 As one embodiment of the present invention, specifically, the internal structure of the horizontal plate 91 has multiple parallel connecting holes 911, the internal structure of the vertical plate 92 has a connecting groove 921 communicating with the connecting holes 911, and the bottom of the vertical plate 92 has a side groove 922. The "pipeline system" formed by the connecting holes 911, the connecting groove 921 and the side groove 922 connects the lower part of the automotive aluminum alloy door panel to be stamped with the negative pressure area above the lifting seat 10. When a negative pressure is generated below the stamping groove 32, the air can be drawn away along the preset path, thereby forming an effective pressure difference below the automotive aluminum alloy door panel, ensuring that the "vacuum adsorption" can play a better adsorption role on the automotive aluminum alloy door panel, thereby ensuring that the automotive aluminum alloy door panel to be stamped will not be deformed or torn during the stamping process.

[0038] Reference Figure 4 In one embodiment of the present invention, the lifting seat 10 specifically includes a bent plate 101 and a sliding column 102. The bent plate 101 is slidably fitted within the slide groove 42, and the sliding column 102 is installed on the side wall of the bent plate 101. The sliding column 102 is slidably and sealingly fitted within the limiting groove 43, forming a sliding seal with the limiting groove 43 to prevent air in the inner groove 41 from entering the space above the bent plate 101 in the slide groove 42. The sliding column 102 meshes with the transmission gear 45. The bent plate 101 serves as the main support and guide, ensuring the stability of the lifting seat 10 during movement. The sliding column 102 can slide and seal. The sliding column 102 is fitted into the limiting groove 43 of the base 4. The side of the sliding column 102 is machined with a toothed structure, which can mesh with the large gear in the transmission gear 45. When the docking seat moves down, the insert rod 83 drives the small gear in the transmission gear 45 to rotate. The small gear drives the large gear to rotate at the same speed through the chain. Since the large gear has more teeth, its linear speed is faster when rotating, which causes the sliding column 102 to move down at a higher speed than the insert rod 83. Thus, under the action of the large gear and the small gear, the downward speed of the lifting seat 10 is faster than that of the docking seat 8, so that the space above the lifting seat 10 can be quickly opened up, generating a strong negative pressure effect.

[0039] Working principle: Before the stamping work begins, the automotive aluminum alloy door panel to be processed is precisely placed in the die casting placement groove 31 on the surface of the fixed mold 3. The area of ​​the automotive aluminum alloy door panel that needs to be stamped to form a deep groove is suspended above the stamping groove 32. Its bottom surface is stably supported by the horizontal plate 91, while the bottom of the vertical plate 92 is closely attached to the upper surface of the bending plate 101.

[0040] When the stamping begins, the hydraulic cylinder 6 retracts, driving the top seat 1, moving mold 2 and mold base 21 to move downward as a whole, applying pressure to the automotive aluminum alloy door panel. The docking seat 8, fixed at the bottom of the top seat 1, moves downward synchronously at the same speed. During the downward movement of the docking seat 8, the insert rod 83 at its bottom acts as a rack under the action of the tooth groove 831 and meshes with the small gear in the transmission gear 45, thereby driving the large gear in the transmission gear 45 to rotate in the corresponding direction.

[0041] The rotating pinion drives the bending plate 101 downward through the sliding column 102. The sliding column 102 moves downward in contact with the limiting groove 43, while the bending plate 101 moves downward in contact with the sliding groove 42. With the design of the large and small gears, the downward speed of the bending plate 101 is faster than that of the ring seat 81. The volume of the sealed space above the lifting seat 10 in the sliding groove 42 expands rapidly in an instant, and the pressure drops rapidly to form a negative pressure. This negative pressure then generates a strong suction effect, which causes the air in the stamping groove 32 to be rapidly drawn into the ever-expanding negative pressure space through the connecting hole 911, connecting groove 921 and side groove 922. This stretches the automotive aluminum alloy door panel and guides it to smoothly and tightly adhere to the inner wall of the stamping groove 32, avoiding the additional tensile stress caused by springback and preventing the edge of the automotive aluminum alloy door panel from being torn during deep stamping.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stamping die for die casting metal structures, comprising a top seat (1), a moving die (2), a die base (21), a fixed die (3), and a hydraulic cylinder (6), characterized in that: It also includes a base (4), a sealing plate (5), a limiting ring (7), a docking seat (8), a support seat (9), and a lifting seat (10). The surface of the fixed mold (3) is provided with a die-casting part placement groove (31) and a stamping groove (32). The interior of the base (4) is provided with an inner groove (41), a sliding groove (42), and a limiting groove (43). The surface of the base (4) is provided with a perforation (44). A transmission gear (45) is installed between the inner groove (41) and the limiting groove (43). The sealing plate (5) is attached to the edge of the inner groove (41). The limiting ring (7) is installed on the surface of the base (4), and the perforation (44) is located inside the limiting ring (7). The docking seat (8) is installed at the bottom of the top seat (1). The docking seat (8) and the limiting ring (7) are slidably engaged. The lifting seat (10) is slidably disposed between the sliding groove (42) and the limiting groove (43). The lifting seat (10) is connected to the docking seat (8) through the transmission gear (45). The support seat (9) is disposed in the stamping groove (32). The bottom of the support seat (9) extends through the fixed mold (3) into the inner groove (41). The docking seat (8) moves down when the hydraulic cylinder (6) contracts. The docking seat (8) drives the lifting seat (10) to move down faster than the docking seat (8). When the lifting seat (10) moves down, the space above it increases. The air in the stamping groove (32) is drawn into the space above the lifting seat (10) through the support seat (9).

2. The stamping die for die-casting metal structures according to claim 1, characterized in that: The stamping groove (32) is located directly below the mold base (21). When the moving mold (2) and the fixed mold (3) are in contact, the top of the support base (9) is flush with the bottom surface of the stamping groove (32).

3. The stamping die for die-casting metal structures according to claim 1, characterized in that: The docking seat (8) includes a ring seat (81), a long rod (82) and a plug rod (83). The ring seat (81) is installed at the bottom of the top seat (1). The long rod (82) is installed inside the ring seat (81) and is coaxial with the ring seat (81). The plug rod (83) is installed at the bottom of the long rod (82).

4. The stamping die for metal structural die castings according to claim 3, characterized in that: The inner circumference of the circular seat (81) slides and seals against the outer circumference of the limiting ring (7), and the outer circumference of the long rod (82) slides and seals against the inner circumference of the limiting ring (7).

5. The stamping die for die casting metal structures according to claim 3, characterized in that: The insertion rod (83) has a tooth groove (831) on the side near the transmission tooth (45), and the tooth groove (831) is adapted to the transmission tooth (45).

6. The stamping die for die-casting metal structures according to claim 2, characterized in that: The support base (9) includes a horizontal plate (91) and a vertical plate (92). The horizontal plate (91) is disposed in the stamping groove (32), and the vertical plate (92) is connected to the bottom of the horizontal plate (91). In the unstamped state, the surface of the horizontal plate (91) is in contact with the bottom surface of the die-cast part placed in the stamping groove (32), and the bottom of the vertical plate (92) is in contact with the surface of the lifting seat (10).

7. The stamping die for metal structural die castings according to claim 6, characterized in that: The horizontal plate (91) has multiple parallel connecting holes (911) inside, the vertical plate (92) has a connecting groove (921) that communicates with the connecting holes (911) inside, and the bottom of the vertical plate (92) has a side groove (922).

8. The stamping die for metal structural die castings according to claim 1, characterized in that: The lifting seat (10) includes a bent plate (101) and a sliding column (102). The bent plate (101) is slidably fitted in the sliding groove (42). The sliding column (102) is installed on the side wall of the bent plate (101) and is slidably and sealingly fitted in the limiting groove (43). The sliding column (102) meshes with the transmission gear (45).

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