Subframe support aluminum profile stamping device

Abstract

This utility model relates to the field of aluminum alloy profile processing technology, specifically a stamping device for aluminum profiles of a subframe bracket. The upper die is connected to the upper clamping plate, and the lower die is connected to the lower pad plate. A left punch, a right punch, punch A, punch B, and punch C are embedded between the upper die and the upper clamping plate. The upper die has grooves machined on both its front and rear surfaces, into which a front positioning block and a rear positioning block are embedded. The lower parts of the front and rear positioning blocks protrude from the grooves and abut against the right side of the profile's positioning surface. This utility model integrates adjustment functions into the upper die body, achieves micron-level precision compensation through a shim group, and realizes unified control of the entire batch's benchmark, ultimately achieving a 100% pass rate—a breakthrough in the industry. Furthermore, the die adjustment is convenient, the modification cost is low, it is easy to implement, and it is conducive to industrial promotion and use.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy profile processing technology, specifically to a stamping device for aluminum profiles of subframe brackets. Background Technology

[0002] The subframe, as a key load-bearing component of the automotive chassis system, plays a crucial role in connecting the vehicle body and suspension system. Its manufacturing precision directly affects the vehicle's handling stability and safety. The subframe can be seen as the skeleton of the front and rear axles, a component of them, and its main function is to isolate vibrations and noise, reducing their direct entry into the passenger compartment. The subframe bracket is the connecting component between the subframe and the vehicle chassis. In recent years, due to the requirements for vehicle lightweighting, subframe brackets are manufactured by extruding aluminum profiles and then stamping them, offering advantages such as lighter weight and corrosion resistance compared to traditional steel components.

[0003] The aluminum profile of the subframe bracket has an outer contour resembling a "hat." The upper section of the profile has a multi-cavity structure, while the lower section forms the "brim." The "brim" requires punching and trimming during the stamping process. During the extrusion production stage, due to uncontrollable factors in hot extrusion, the upper section of the profile experiences unavoidable dimensional tolerances (horizontal dimension deviation of approximately ±0.5mm) in the perpendicularity of the multi-cavity structure, or deviations in the external dimensions of the profile section. These initial dimensional tolerances then cause problems in subsequent stamping stages: if the edge of the "brim" is used for positioning, the stamping holes will be misaligned; if the upper edge of the profile is used for positioning, the perpendicularity dimensional tolerance is not fixed, and the dimensional tolerances of each batch of profiles will vary slightly depending on the temperature of the hot extrusion. Therefore, it is impossible to use the same set of stamping dies to adapt to the stamping size requirements of different batches of profiles (with different dimensional tolerances). This resulted in the subframe support profiles having a pass rate of only 85%-96% during the stamping stage, leading to a large number of scraps and a significant increase in production costs.

[0004] The positioning methods of traditional vehicle subframe stamping dies mainly fall into two categories: First, fixed positioning pins or blocks, such as patents CN202020671597.3 (a stamping die for an automotive subframe) and CN202021924049.3 (a stamping die for an automotive rear subframe), which constrain the workpiece through a rigid structure pre-installed on the die; second, universal clamping devices driven by springs, screws, hydraulics, or motors, such as patents CN202322582175.5 (a stamping die for a subframe mounting bracket), CN202322660901.0 (a special-shaped machining die for an automotive subframe), and CN202322660901.0 (a stamping die for subframe sheet metal parts), which prevent movement by pressing or clamping the workpiece before stamping. Based on existing patents and technical solutions, subframe bracket stamping dies suffer from two common defects in their positioning systems:

[0005] 1. Unadjustable Side Positioning Rigidity: Existing molds generally use fixed blocks or positioning pins to constrain the sides of the workpiece. Although the structure is simple, most of the clamping force is concentrated in the vertical direction, and the horizontal direction relies only on a single-sided block. This cannot adapt to the unavoidable form and position tolerances (horizontal dimension deviation of about ±0.5mm) in aluminum profile extrusion molding. When the width of a batch of materials has a deviation of 0.3mm, the fixed block will cause the actual positioning datum of the workpiece to fluctuate within the range of 0.3mm. In multi-process continuous stamping, this deviation accumulates further, eventually causing the contour to exceed the tolerance. For example, in the edge trimming and punching processes, the hole position deviation caused by the drift of the datum surface can reach up to 0.8mm, significantly exceeding the process requirement of ±0.1mm.

[0006] 2. Lack of dynamic adjustment mechanism: Existing molds can only fix the workpiece in a single dimension and lack real-time compensation functionality. Operators cannot fine-tune the positioning reference based on the actual measured dimensions of the workpiece before stamping, nor can they unify all workpieces to a completely consistent positioning state in the same batch of production. This lack of adjustment mechanism results in each product having a "unique" positioning error, with the pass rate fluctuating randomly between 85% and 96%, making stable control impossible. Summary of the Invention

[0007] To address the aforementioned shortcomings, this invention embeds the adjustment function into the upper mold body, achieves micron-level precision compensation through a shim group, and realizes unified control of the entire batch benchmark, ultimately achieving an industry breakthrough with a 100% pass rate. Moreover, the mold is easy to adjust, has low modification costs, is easy to implement, and is conducive to industrial promotion and use.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] A stamping device for aluminum profiles of a subframe bracket, wherein the upper die is connected to the upper clamping plate and the lower die is connected to the lower pad plate. A left punch, a right punch, punch A, punch B, and punch C are embedded and installed between the upper die and the upper clamping plate. The upper die has grooves on both the front and rear sides, in which a front positioning block and a rear positioning block are embedded and installed. The lower parts of the front positioning block and the rear positioning block protrude from the grooves and abut against the right side positioning surface of the profile.

[0010] By inserting a specific positioning block into the groove, the positioning block matches the cross-sectional shape of a specific batch of profiles. When the upper die presses down, the lower positioning surface of the positioning block is always in contact with the right side positioning surface of the profile, thereby accurately positioning the horizontal position of the profile, and the punched hole position is the precise hole position.

[0011] The front and rear positioning blocks are symmetrical structures with a wedge shape below the positioning surface. When the upper mold presses down, it can prevent the positioning blocks from scratching the right side of the subframe bracket profile, and it can avoid interference with the existing positioning surface on the right side of the profile during positioning.

[0012] The front and rear positioning blocks in the groove are used in conjunction with the matching gaskets and are embedded side by side in the groove, with a retaining edge at one end of the gasket.

[0013] The function of the gasket is to fill the gap in the groove, so that the total thickness of the positioning block and the gasket matches the width of the groove, and the positioning block is firmly fixed in the groove without moving. When the positioning block is replaced, the matching gasket also needs to be replaced at the same time. The retaining edge of the gasket is exposed outside the end face of the groove for easy removal.

[0014] The upper mold has guide posts installed at its four corners, which mate with guide holes at the four corners of the lower mold. The guide posts and guide holes act as guides when the upper and lower molds are pressed down, resulting in a more precise fit between them.

[0015] The lower mold is machined with embedded slots for mounting the left limiting block, the front limiting block, and the rear limiting block; the left limiting block is L-shaped and rests against the lower left edge of the profile, the front limiting block rests against the front end face of the profile, and the rear limiting block rests against the rear end face of the profile; the right positioning head of the lower mold rests against the original positioning surface of the lower right edge of the profile.

[0016] The front positioning block, rear positioning block, shim, punch, and punch pin are all cut by wire cutting machine to ensure high precision of stamping and accurate positioning.

[0017] The left and front limiting blocks are connected to the lower die via compression springs. The function of the left limiting block and compression spring is as follows: the right locating head abuts against the original right locating surface of the profile, the locating block abuts against the current right locating surface of the profile, and the left limiting block abuts against the left side of the profile, clamping the profile in both directions to prevent displacement or misalignment during stamping. The function of the front limiting block and compression spring is as follows: the front and rear limiting blocks respectively clamp the front and rear end faces of the profile to prevent displacement or misalignment during stamping.

[0018] Advantages of this utility model:

[0019] 1. This utility model integrates the side positioning function into the upper die, enabling the workpiece to achieve full six-degree-of-freedom constraint at the moment of clamping. After the upper die presses down to fix the upper surface of the workpiece, the positioning block-shield combination provides rigid support from the side, ensuring that the workpiece's reference hole always maintains a predetermined distance from the right reference surface of the profile. This design ensures that the distance from the center of the workpiece's reference hole to the right reference surface of the workpiece remains consistent, eliminating the errors in subsequent processing caused by the original errors in the extrusion-stamping process.

[0020] 2. This utility model retains the flexibility of manual shim selection, avoiding the high cost of complex sensors or servo systems. The operator only needs to select the appropriate shim during the first adjustment, and the same configuration can be used for subsequent batches of profile workpieces. Actual production line verification shows that this solution increases the surface profile qualification rate of the aluminum extrusion subframe support from 85%-96% to a stable 100%, while also reducing the cost of re-opening the stamping die.

[0021] 3. The mold of this utility model is simple to modify and has low modification cost. It only requires the processing of grooves and several sets of positioning blocks and shims on a regular punching and trimming mold to realize the modification of the adjustable stamping mold. The stamped workpiece has a high qualification rate, is easy to implement, and is conducive to industrial promotion and use. Attached Figure Description

[0022] Figure 1 The facade structure of the stamping device of this utility model Figure 1 (Not yet molded)

[0023] Figure 2 This is a front view of the stamping device of this utility model; (without mold closing).

[0024] Figure 3 This is a left view of the stamping device of this utility model; (without mold closing).

[0025] Figure 4 This is a top view of the stamping device of this utility model after mold closing;

[0026] Figure 5 This is an elevation view of the stamping device of this utility model after the upper die is assembled.

[0027] Figure 6 This is a diagram showing the component relationships after the lower die of the stamping device of this utility model is assembled;

[0028] Figure 7 for Figure 4 Cross-sectional view along the AA direction;

[0029] Figure 8 The facade structure of the stamping device of this utility model Figure 2 (After stamping)

[0030] Figure 9 This is an elevation view of the front positioning block.

[0031] Figure 10 This is a side view of the front positioning block;

[0032] Figure 11 This is a structural elevation view of the gasket;

[0033] Figure 12 A schematic diagram showing the cross-section and positioning of the aluminum profile for the subframe support;

[0034] Figure 13 This is a finished drawing of the aluminum profile for the subframe support.

[0035] The numbers and component names in the diagram are as follows: 1-Upper clamping plate; 2-Upper mold; 3-Lower mold; 4-Lower pad; 5-Profile; 6-Guide post; 7-Left limit block; 8-Front limit block; 9-Right positioning head; 10-Rear limit block; 11-Front positioning block; 111-Positioning surface; 12-Rear positioning block; 13-Shim; 14-Left punch; 15-Right punch; 16-Punch A; 17-Punch B; 18-Punch C; 19-Guide hole. Detailed Implementation

[0036] Example 1

[0037] A stamping device for aluminum profiles of a subframe bracket, wherein an upper die 2 is connected to an upper clamping plate 1, and a lower die 3 is connected to a lower pad plate 4. A left punch 14, a right punch 15, a punch A16, a punch B17, and a punch C18 are embedded and installed between the upper die 2 and the upper clamping plate 1. The upper die 2 has grooves on both the front and rear sides, and a front positioning block 11 and a rear positioning block 12 are embedded and installed in the grooves. The lower parts of the front positioning block 11 and the rear positioning block 12 protrude from the grooves and abut against the right side positioning surface of the profile 5.

[0038] The front positioning block 11 and the rear positioning block 12 are symmetrical structures, and the lower part of the positioning surface is wedge-shaped.

[0039] The front positioning block 11 and the rear positioning block 12 in the groove are used in conjunction with the matching gasket 13 and are embedded side by side in the groove. One end of the gasket 13 is provided with a retaining edge.

[0040] The upper mold 2 is equipped with guide posts 6 at its four corners, which cooperate with the guide holes 19 at the four corners of the lower mold 3.

[0041] The lower mold 3 is machined with embedded grooves for mounting the left limiting block 7, the front limiting block 8, and the rear limiting block 10; the left limiting block 7 is L-shaped and abuts against the lower left edge of the profile 5, the front limiting block 8 abuts against the front end face of the profile 5, and the rear limiting block 10 abuts against the rear end face of the profile 5; the right positioning head 9 of the lower mold 3 abuts against the original positioning surface of the lower right edge of the profile 5.

[0042] The left limiting block 7 and the front limiting block 8 are connected and installed to the lower mold 3 via compression springs.

[0043] Table 1 below shows the product yield rate after stamping according to the original design:

[0044] Table 1. Product yield rate after stamping according to the original design

[0045]

[0046] Table 2 below shows the product qualification rate after stamping according to this utility model design:

[0047] Table 2. Product qualification rate after stamping according to this utility model.

[0048]

[0049] By comparing the data in Tables 1 and 2, it can be seen that after using the design of this utility model, the pass rate of the aluminum extruded subframe bracket surface profile jumped from 85%-96% to a stable level of 100%, which is a very significant improvement and greatly reduces production costs.

Claims

1. A stamping device for aluminum profiles of a subframe bracket, wherein an upper die (2) is connected to an upper clamping plate (1), a lower die (3) is connected to a lower pad plate (4), and a left punch (14), a right punch (15), a punch A (16), a punch B (17), and a punch C (18) are embedded and installed between the upper die (2) and the upper clamping plate (1); characterized in that: The upper mold (2) has grooves on both the front and back sides. The front positioning block (11) and the rear positioning block (12) are embedded in the grooves. The lower parts of the front positioning block (11) and the rear positioning block (12) protrude from the grooves and are in contact with the right side of the profile (5).

2. The aluminum profile stamping device for the subframe bracket according to claim 1, characterized in that: The front positioning block (11) and the rear positioning block (12) are symmetrical structures, and the lower part of the positioning surface is wedge-shaped.

3. The aluminum profile stamping device for the subframe bracket according to claim 1, characterized in that: The front positioning block (11) and the rear positioning block (12) in the groove are used in conjunction with the matching gasket (13) and are embedded side by side in the groove. One end of the gasket (13) is provided with a retaining edge.

4. The aluminum profile stamping device for the subframe bracket according to claim 1, characterized in that: The upper mold (2) has guide posts (6) installed at its four corners, which cooperate with the guide holes (19) at the four corners of the lower mold (3).

5. The aluminum profile stamping device for the subframe bracket according to claim 1, characterized in that: The lower mold (3) is machined with embedded grooves for mounting the left limiting block (7), the front limiting block (8), and the rear limiting block (10); the left limiting block (7) is L-shaped and abuts against the lower left side edge of the profile (5); the front limiting block (8) abuts against the front end face of the profile (5); and the rear limiting block (10) abuts against the rear end face of the profile (5); the right positioning head (9) of the lower mold (3) abuts against the original positioning surface of the lower right side edge of the profile (5).

6. The aluminum profile stamping device for the subframe bracket according to claim 5, characterized in that: The left limiting block (7) and the front limiting block (8) are connected and installed to the lower mold (3) by compression springs.

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