Automobile part half-cutting die structure

Abstract

The utility model provides a kind of automobile parts half shearing mould structure, including upper die assembly, lower die assembly and the product material belt being set on lower die assembly, wherein: the lower die plate inner cavity of lower die assembly movably is provided with the lower die float block corresponding with product material belt, the bottom of lower die float block is movably installed on the lower die seat below by lower die isohypse bolt and lower die rectangular spring;And when lower die float block is lowered to dead point position, the horizontal height difference Δh of the top plane distance lower die plate top plane is less than the thickness of product material belt. After the product material band to be processed is added half shearing working step using the half shearing mould structure, then blanking is carried out, product material half can be sheared to 0.4mm depth with the thickness of 0.8mm, product installation surface flatness can be effectively improved, meet product drawing requirement.

Description

Technical Field

[0001] This utility model relates to the field of automotive mold manufacturing technology, and in particular to a semi-shear mold structure for automotive parts. Background Technology

[0002] In the manufacturing process of automotive parts, the flatness requirements for the mounting surfaces of precision components such as the volute cover are extremely high. Figure 1 and Figure 2 As shown, the flatness of the volute cover typically needs to be controlled within 0.05mm. Traditional progressive die processes, such as... Figure 3 As shown, the process typically involves a continuous sequence of steps including embossing, punching, trimming, shaping, blanking, and cutting. The blanking step, due to the shearing force affecting the entire circumference, causes excessive internal stress on the mounting surface, resulting in twisting deformation and making it difficult to achieve a flatness accuracy of 0.05mm. This stress concentration is particularly pronounced when processing 0.8mm thick product strips. Furthermore, existing mold structures lack effective stress buffering mechanisms in the lower mold assembly, preventing the effective release and dispersion of stress generated during stamping.

[0003] Furthermore, the lower die assembly of traditional molds typically employs a fixed structure, making dynamic adjustment during the stamping process impossible, which further exacerbates the stress concentration problem. To achieve a flatness of 0.05 on the mounting surface of the volute cover, it is necessary to reduce excessive stress during the blanking process. Therefore, it is essential to design a semi-shear die structure. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a semi-shear die structure for automotive parts, which has the advantages of effectively dispersing stamping stress, reducing deformation of the mounting surface, and improving flatness accuracy, in order to address the shortcomings of the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] A semi-shear die structure for automotive parts includes an upper die assembly, a lower die assembly, and a product strip disposed on the lower die assembly. The lower die assembly has a lower die float movably disposed within its lower die platen cavity, corresponding to the product strip. The bottom of the lower die float is movably mounted on a lower die base below via lower die equalization bolts and a lower die rectangular spring. Furthermore, when the lower die float moves to its dead center position, the horizontal height difference Δh between its top plane and the top plane of the lower die platen is less than the thickness of the product strip.

[0007] Preferably, when the lower mold float moves to the dead point position, its top plane is lower than the horizontal height of the top plane of the lower mold plate, and the horizontal height difference Δh is 1 / 3 to 2 / 3 of the thickness of the product strip.

[0008] More preferably, when the lower mold float moves down to the dead point position, the horizontal height difference Δh between its top plane and the top plane of the lower mold plate is 1 / 2 of the thickness of the product strip.

[0009] Preferably, the top end of the lower mold equalizing bolt is fixedly connected to the bottom of the lower mold float, and its lower end is movably inserted into the shaft hole of the lower mold base. The top of the first limiting boss at its bottom end is arranged opposite to the bottom of the second limiting boss on the inner peripheral wall of the shaft hole of the lower mold base, forming the upper dead point position of the lower mold float.

[0010] Preferably, the lower mold rectangular spring is movably sleeved on the upper end of the lower mold equal-height bolt, and its top abuts against the bottom of the lower mold float block, and its top abuts against the top of the second limiting boss on the inner peripheral wall of the lower mold seat shaft hole.

[0011] Preferably, the lower mold assembly includes a lower support plate, lower pads, a lower mold base, and a lower template, wherein:

[0012] The lower mold base is fixedly installed on the lower support plate via the lower pad feet. The lower template is fixedly installed on its top. The lower template and the inner hole of the lower mold base are movably provided with the lower mold float, lower mold equal-height bolt and lower mold rectangular spring arranged coaxially.

[0013] More preferably, the lower mold assembly further includes material support assemblies disposed upstream and downstream of the lower mold plate, wherein:

[0014] Each set of the material support assembly includes two material support blocks arranged symmetrically from left to right. The inner sidewall of the material support block is provided with a limiting groove for installing the product strip, and the material support block is mounted on the lower mold base by a return spring at its bottom.

[0015] More preferably, the lower mold assembly further includes a downward positioning block fixedly disposed between the lower template and the lower mold base, wherein:

[0016] The lower positioning block is sleeved on the outside of the lower mold equal-height bolt and the lower mold rectangular spring through its inner hole, and the upper edge of its inner hole protrudes inward from the lower edge of the lower mold inner hole, forming a lower positioning dead point that is limited and connected to the lower edge of the outer periphery of the lower mold float.

[0017] Preferably, the upper die assembly includes an upper support plate, an upper die base, and an upper die punch, wherein:

[0018] The upper mold base is located at the bottom of the upper support plate, and the bottom of the upper mold base is provided with the upper mold punch corresponding to the lower mold plate.

[0019] More preferably, the upper mold assembly further includes upper mold equal-height bolts, an upper mold rectangular spring, and a stripper plate, wherein:

[0020] The upper die rectangular spring is sleeved on the outer periphery of the upper die punch, and its top and bottom can respectively abut against the upper die base above and the stripper plate below;

[0021] The stripper plate is mounted on the bottom of the upper die base by the upper die equal-height bolts, and the upper die punch is provided in its inner hole.

[0022] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0023] The core solution of the semi-shear die structure for automotive parts provided by this utility model is to add a semi-shear step before the blanking step. Dynamic buffering is achieved through the cooperation of the lower die float block and the lower die rectangular spring. Combined with height difference control, the stamping stress is effectively dispersed, reducing deformation caused by stress concentration inside the product strip. This has the advantage of improving the flatness accuracy of the mounting surface. By adding a semi-shear step to the product strip to be processed before blanking using this semi-shear die structure, the product strip with a thickness of 0.8mm can be semi-sheared to a depth of 0.4mm, which can effectively improve the flatness of the product mounting surface, meet the requirements of the product drawings, and allow for smooth production in the stamping die. Attached Figure Description

[0024] Figure 1 A process flow diagram for progressive dies used to process product strips using existing automotive parts mold structures;

[0025] Figure 2 This is a flowchart of the progressive die process for processing product strip using a semi-shear die structure for automotive parts according to this utility model.

[0026] Figure 3 This is a schematic diagram of a semi-shear blank structure processed using a semi-shear die structure for automotive parts according to the present invention.

[0027] Figure 4 and Figure 5 The images are a top view and a sectional view of a volute cover product manufactured using a semi-shear mold structure for automotive parts according to this utility model.

[0028] Figure 6 This is a cross-sectional view of the semi-shear mold structure for automotive parts of this utility model when it is in the closed mold state.

[0029] Figure 7 This utility model Figure 6 The diagram shows a partially enlarged view of part A of a semi-shear mold structure for automotive parts when the mold is in the closed state.

[0030] Figure 8This is a cross-sectional view of the semi-shear mold structure for automotive parts of this utility model in the mold-opening state.

[0031] Figure 9 This utility model Figure 8 The diagram shows a partially enlarged view of part B of a semi-shear mold structure for automotive parts when the mold is in the open state.

[0032] The accompanying figures are labeled as follows:

[0033] The accompanying figures are labeled as follows:

[0034] 100-Upper mold assembly, 101-Upper support plate, 102-Upper mold base, 103-Upper mold equalizing bolt, 104-Upper mold rectangular spring, 105-Upper mold punch, 106-Stripping plate;

[0035] 200-Lower mold assembly, 201-Lower support plate, 202-Lower pad, 203-Lower mold base, 2031-Second limiting boss, 204-Lower template, 2041-Excess material clamping table; 205-Lower mold equalizing bolt, 2051-First limiting boss, 206-Lower mold rectangular spring, 207-Lower mold float, 208-Material support assembly, 2081-Limiting material groove, 209-Lowering positioning block, 2091-Lowering limiting dead point;

[0036] 300 - Product material strip, 301 - Product material, 302 - Residual material. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0038] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] like Figure 1 and Figure 2 As shown, in existing technologies, the flatness requirements for the mounting surface of automotive component volute covers are high, requiring control within 0.05mm. Traditional progressive die processes use a full-circumferential shearing method to complete the blanking process, such as... Figure 3 As shown, the material is subjected to force throughout its circumference during shearing, leading to internal stress concentration and torsional deformation, making it difficult to meet high-precision flatness requirements. This problem is particularly pronounced in the machining of thin-walled parts, and conventional solutions cannot effectively balance the contradiction between shear force and deformation control.

[0040] To address these issues, researchers discovered that stress concentration generated by the full-circumference shearing process was the core factor causing flatness deviations. By analyzing the material's stress distribution, they proposed using localized shearing to disperse stress, such as... Figure 4 and Figure 5 As shown, a semi-shearing step is added before the blanking step. The product material thickness is 0.8mm, and the semi-shearing depth is 0.4mm. Based on this idea, a process method for controlling the shearing depth in stages is designed. An elastic support structure is used to achieve dynamic pressure adjustment, forming a synergistic mechanism between the semi-shearing process and the mold structure.

[0041] In some embodiments, such as Figure 6 and Figure 8 As shown, this application proposes a semi-shear die structure for automotive parts, including an upper die assembly 100, a lower die assembly 200, and a product strip 300 disposed on the lower die assembly 200. A lower die float 207 corresponding to the product strip 300 is movably disposed within the lower template 204 of the lower die assembly 200. The bottom of the lower die float 207 is movably mounted on the lower die base 203 below via a lower die equalization bolt 205 and a lower die rectangular spring 206. When the lower die float 207 moves down to its dead position, the horizontal height difference Δh between its top plane and the top plane of the lower template 204 is less than the thickness of the product strip 300.

[0042] The lower die float 207 is a movable forming component that contacts the product strip. It can be made of hardened alloy steel, and its movable installation allows for vertical displacement during stamping. The lower die equalizing bolt 205 is a connector with a fixed length, typically a double-ended bolt, used to limit the travel range of the lower die float 207. The lower die rectangular spring 206 is a rectangular cross-section helical spring, typically made of 60Si2Mn material, providing elastic support through pre-compression. The horizontal height difference refers to the vertical distance between the lower die float 207 and the top surface of the lower die template 204, which can be controlled by adjusting the bolt installation position or the spring compression.

[0043] Specifically, during the stamping process, when the upper die assembly 100 moves downward, the stamping force drives the lower die float 207 to move downward against the resistance of the lower die rectangular spring 206. When the lower die float 207 reaches the dead point, the height difference between its top and the top surface of the lower die plate 204 ensures that only a portion of the product strip 300 is sheared. This height difference can be precisely maintained by the synergistic action of the lower die equalizing bolt 205 and the lower die rectangular spring 206, ensuring that the shearing depth is always less than the total thickness of the material. In this state, the unsheared area forms a stress buffer zone, effectively dispersing the impact of the shearing force on the mounting surface of the product strip 301. After stamping is completed, the lower die rectangular spring 206 pushes the lower die float 207 to reset, completing the cyclic operation of the half-shearing process.

[0044] Compared to existing technologies, traditional molds use a fixed lower template to directly complete full-circumference shearing, while this solution achieves localized shearing through an adjustable floating block structure. In existing technologies, the material bears continuous load at the shear line, while this solution retains an uncut layer of material in the shear zone, forming an elastic deformation zone. The rigid structure of existing molds cannot alleviate stress concentration, while the elastic support system of this solution can dynamically absorb some of the impact energy.

[0045] Through the above technical solution, this application effectively reduces the internal stress generated during the stamping process and avoids the torsional deformation of the mounting surface of the product material 301 caused by full-circumference shearing. The flatness of the stamped product material 301 can stably meet the design requirements, and the mold structure can adapt to the processing needs of product strips 300 with different thicknesses. This solution solves the technical bottleneck of traditional processes in high-precision flat surface processing and achieves simultaneous improvement in stamping quality and process stability.

[0046] In some of these embodiments, such as Figure 6 and Figure 7 As shown, this application further proposes that when the lower mold float 207 moves down to the dead point position, its top plane is lower than the horizontal height of the top plane of the lower mold plate, and the horizontal height difference Δh is 1 / 3-2 / 3 of the product strip thickness, preferably 1 / 2.

[0047] The horizontal height difference Δh refers to the vertical distance between the top plane of the lower die float 207 and the material clamping platform 2041 at the top of the lower die template 204. This can be achieved by adjusting the installation height of the lower die equalizing bolts 205. This parameter setting directly affects the shearing depth control. The 1 / 3-2 / 3 range of the product strip thickness is an effective range verified through experiments. Specifically, a value range of 0.25-0.55mm corresponding to a standard material thickness of 0.8mm can be used. This range achieves effective shear deformation while avoiding material tearing.

[0048] Specifically, when the lower die float 207 moves downwards to the mechanical limit point under pressure, its top plane forms a stepped drop with the remaining material clamping table 2041. During the stamping process, when the upper die punch 105 and the lower die plate 204 work together, the product strip 300 undergoes progressive shear deformation in the drop area. When Δh is controlled within 1 / 3 to 2 / 3 of the material thickness, the shear depth is limited to the middle section of the material, causing the material to undergo delamination deformation rather than complete shearing. This controlled shearing allows the internal stress of the material to be released in a gradient along the thickness direction, avoiding the stress abrupt change caused by full-circumference shearing.

[0049] As one specific implementation method, such as Figure 5 and Figure 7As shown, this application further proposes that when the lower mold float 207 moves down to the dead point position, the horizontal height difference Δh between its top plane and the top plane of the lower mold plate 204 is half the thickness of the product strip 300. This horizontal height difference Δh is the shearing depth. For example, if the thickness of the product strip 300 is 0.8mm, the shearing depth between the product material 301 on the inner side of the product strip 300 and the excess material 302 on the outer side is 0.4mm.

[0050] This solution uses a mechanical limiting structure to precisely limit the shearing depth to half the material thickness, making the shearing force distribution more uniform and effectively suppressing flatness deviations caused by local stress concentration. This avoids stress abrupt changes caused by full shearing and ensures that the material maintains uniform deformation in subsequent blanking processes.

[0051] In some of these embodiments, such as Figure 8 and Figure 9 As shown, this application further proposes that the top end of the lower mold equalization bolt 205 is fixedly connected to the bottom of the lower mold float 207, and its lower end is movably inserted into the shaft hole of the lower mold base 203. The top of the first limiting boss 2051 at its bottom end is arranged opposite to the bottom of the second limiting boss 2031 on the inner peripheral wall of the shaft hole of the lower mold base 203, forming the upper dead point position of the lower mold float 207.

[0052] The top of the lower mold equalizing bolt 205 is fixedly connected to the bottom of the lower mold float 207 to ensure a vertical movement trajectory. The first limiting boss 2051 is a radially extended structure located at the bottom of the lower mold equalizing bolt 205, which can be implemented using an annular flange or a stepped shaft structure, used to limit the upward travel of the lower mold float 207. The second limiting boss 2031 is a radially extended structure located on the inner circumferential wall of the shaft hole of the lower mold base 203, which can be implemented using an annular groove or a stepped hole structure, forming a rigid limit through contact with the first limiting boss 2051.

[0053] Specifically, when the lower die float 207 moves downward under the pressure of the upper die punch 105 during the stamping process, the lower die equalizing bolt 205 slides axially along the shaft hole of the lower die base 203, and the lower die rectangular spring 206 is compressed and stores energy. When the press slide returns, the lower die float 207 resets upward under the action of the spring. At this time, the first limiting boss 2051 and the second limiting boss 2031 contact to form a mechanical hard limit, preventing the lower die float 207 from moving upward further. This structure eliminates the elastic deformation error of traditional spring reset through the rigid fit of the bolt and the boss, ensuring that the lower die float 207 resets to the same height each time, thereby maintaining the stability of the half-shear depth.

[0054] Through the above technical solution, this application solves the problem of half-shear depth deviation caused by uncontrolled up and down movement of the lower mold float 207. The rigid limiting structure ensures the reset accuracy of the float, thereby improving the stability of mold operation and the consistency of the half-shear process.

[0055] In some of these embodiments, such as Figures 6 to 9 As shown, this application further proposes that the lower mold rectangular spring 206 is movably sleeved on the upper end of the lower mold equalizing bolt 205, and its top is abutted to the bottom of the lower mold float 207, and its top is abutted to the top of the second limiting boss 2031 on the inner peripheral wall of the shaft hole of the lower mold base 203.

[0056] Specifically, the lower die rectangular spring 206 is constrained within the axial space formed by the lower die equal-height bolt 205 and the second limiting boss 2031. The compression direction of the lower die rectangular spring 206 always coincides with the axis of the lower die equal-height bolt 205. During the stamping process, when the lower die float 207 moves downward under the pressure of the upper die, the spring is uniformly compressed along the bolt axis, and the contact between its top and the bottom of the float avoids stress concentration. At the end of the stamping stroke, the contact surface between the second limiting boss 2031 and the bottom of the lower die rectangular spring 206 forms a flexible limit, maximizing the compression of the spring and completing elastic energy storage. When the upper die returns, the compressed lower die rectangular spring 206 rebounds vertically along the bolt axis, pushing the lower die float 207 back to its initial position. During this process, the radial displacement of the lower die rectangular spring 206 is completely constrained by the outer wall of the lower die equal-height bolt 205.

[0057] In some of these embodiments, such as Figures 6 to 9 As shown, this application further proposes a lower mold assembly 200 including a lower support plate 201, a lower pad 202, a lower mold base 203, and a lower template 204. The lower mold base 203 is fixedly installed on the lower support plate 201 by the lower pad 202, and the lower template 204 is fixedly provided on its top. The lower template 204 and the lower mold base 203 are movably provided with coaxially arranged lower mold floats 207, lower mold equalizing bolts 205, and lower mold rectangular springs 206.

[0058] The lower support plate 201 is the basic support plate that bears the overall weight of the lower mold assembly 100. It can be made of steel plate with a thickness of 20-50mm and serves as the reference plane for mold installation. The lower pad 202 is the support component connecting the lower support plate 201 and the lower mold base 203. It can be made of a height-adjustable steel block to compensate for mold assembly errors. The lower mold base 203 is the intermediate support structure located on top of the lower pad 202. It can be made of cast iron with stepped holes, the inner hole of which accommodates the movement mechanism of the lower mold float 207. The lower template 204 is the stamping working surface located on top of the lower mold base 203. It can be made of surface-hardened alloy steel, and its cavity contour matches the product strip 300.

[0059] Specifically, the lower support plate 201 and the lower pad 202 are connected by bolts to form a basic support platform, and the lower mold base 203 is fixed to this platform by the lower pad 202 to form a secondary support structure. The lower template 204 is fixed to the top of the lower mold base 203 by locating pins and bolts, and the inner holes of both are precision machined to form a coaxial through hole. The lower mold float 207 is nested in this through hole, and its bottom is connected to the lower mold rectangular spring 206 by the lower mold equalizing bolt 205. The lower end of the spring abuts against the step surface of the second limiting boss 2031 in the inner hole of the lower mold base 203. When the punching force is applied, the lower mold float 207 moves vertically along the axis of the through hole. The limiting step of the lower mold equalizing bolt 205 and the step of the inner hole of the lower mold base 203 form a movement range constraint, and the lower mold rectangular spring 206 provides elastic restoring force.

[0060] In addition, such as Figure 6 and Figure 8 As shown, this application further proposes to include material support components 208 disposed upstream and downstream of the lower template 204. Each set of material support components 208 includes two material support blocks arranged symmetrically on the left and right. The inner sidewall of the material support block is provided with a limiting groove 2081 for installing the product material strip, and the material support block is mounted on the lower mold base 203 by a reset spring at its bottom.

[0061] The material support assembly 208 refers to a conventionally known positioning mechanism located at the inlet and outlet ends of the lower template 204. Specifically, it can be implemented using a symmetrical clamping structure with elastic reset function, used to provide bidirectional constraint on the product strip 300. The limiting groove 2081 refers to a groove structure formed on the inner wall of the material support block. Specifically, it can be implemented using a U-shaped groove structure matching the edge shape of the product strip 300, used to limit the horizontal displacement of the blank. The reset spring refers to an elastic element installed at the bottom of the material support block. Specifically, it can be implemented using a cylindrical helical spring or a nitrogen spring, used to provide dynamic support force during stamping and drive the material support block to reset during unloading.

[0062] Specifically, when the product strip 300 enters the lower die 204, its two side edges are embedded in the limiting grooves of the support block, forming a lateral positioning reference. During the stamping process, the return spring is compressed and deformed, causing the support block to move down synchronously with the lower die float 207, maintaining the clamping state of the blank; after stamping is completed, the return spring releases its elastic force to push the support block back to its original position, causing the product strip 300 to detach from the lower die 204. Through the coordinated action of the upstream and downstream support components 208, the blank is always in the predetermined position during the shearing process, avoiding uneven shear stress distribution caused by displacement.

[0063] Compared with existing technologies, traditional molds lack a dynamic positioning mechanism for the product strip, relying solely on rigid stop blocks for unidirectional constraint. This makes them prone to shear line deviation due to blank slippage during stamping. This application constructs a bidirectional clamping structure through symmetrically arranged material support components, combined with an elastic reset function, to achieve three-dimensional positioning of the blank throughout the entire stamping process.

[0064] In some of these embodiments, such as Figures 6 to 9 As shown, this application further proposes a downward positioning block 209 fixedly disposed between the lower template 204 and the lower mold base 203, wherein: the downward positioning block 209 is sleeved on the outside of the lower mold equalizing bolt 205 and the lower mold rectangular spring 206 through its inner hole, and the upper edge of its inner hole protrudes inward from the lower edge of the inner hole of the lower template 204, forming a downward limiting dead point 2091 that is limited and connected to the lower edge of the outer periphery of the lower mold float 207.

[0065] The lower positioning block 209 is a rigid limiting component located between the lower template 204 and the lower mold base 203. It can be formed from a high-hardness alloy material, and its inner hole forms a clearance fit with the lower mold equal-height bolt 205 and the rectangular spring 206 to constrain the downward stroke of the lower mold float 207. This component uses mechanical limiting instead of the traditional free compression limiting method of a spring, eliminating positioning errors caused by the deformation of elastic elements. The lower limiting dead point 2091 refers to the spatial misalignment structure formed by the upper edge of the inner hole of the lower positioning block 209 and the lower edge of the inner hole of the lower template 204. When the lower edge of the outer periphery of the lower mold float 207 contacts this misalignment structure, a mechanical block is formed, preventing further downward movement, thus precisely limiting the endpoint of the lower mold float 207's movement.

[0066] Specifically, during the stamping process, the lower die float 207 moves downward under the pressure of the upper die punch. The inner hole of the lower positioning block 209 provides axial guidance for the upper die equalizing bolt 205 and the rectangular spring 206. When the float 207 compresses the rectangular spring 206 and moves to the predetermined position, its lower outer edge makes rigid contact with the lower limit dead point 2091 of the upper edge of the inner hole of the lower positioning block 209. Since the upper edge of the inner hole of the lower positioning block 209 protrudes inward relative to the lower edge of the inner hole of the lower die plate 204, a physical limiting interface is formed, at which point the lower die float 207 cannot continue to move downward. This limiting structure acts directly on the float body, avoiding the influence of spring compression changes on the stroke and ensuring that the endpoint position of each downward movement is constant.

[0067] Through the above technical solution, this application effectively solves the problem of inaccurate control of the downward stroke of the lower mold float 207. The rigid contact limit with the lower positioning block 209 ensures the consistency of the half-shear depth, avoids the deviation of shear depth caused by the performance change or uneven force of the lower mold rectangular spring 206, and significantly improves the product flatness qualification rate.

[0068] In some of these embodiments, such as Figure 6 and Figure 8 As shown, this application further proposes that the upper mold assembly 100 includes an upper support plate 101, an upper mold base 102 and an upper mold punch 105, wherein the upper mold base 102 is disposed at the bottom of the upper support plate 101, and the bottom of the upper mold base 102 is provided with an upper mold punch 105 corresponding to the lower mold plate 204.

[0069] The upper support plate 101 is a support plate used to support the overall structure of the upper die assembly 100. It can be made of high-strength steel plate and its function is to provide a stable mounting reference surface for the upper die holder and the upper die punch. The upper die holder 102 is an intermediate structure connecting the upper support plate 101 and the upper die punch 105. It can be fixed to the bottom of the upper support plate 101 with bolts and its function is to transmit the punching pressure of the press vertically to the upper die punch 105. The upper die punch 105 is a rigid component that directly performs the shearing action. It can adopt a geometry that matches the cavity of the lower template 204, and its function is to control the half-shear depth through precise alignment with the lower template 204.

[0070] In addition, such as Figure 6 and Figure 8 As shown, this application further proposes an upper die assembly 100 including an upper die equalizing bolt 103, an upper die rectangular spring 104, and a stripper plate 106, wherein: the upper die rectangular spring 104 is sleeved on the outer periphery of the upper die punch 105, and its top and bottom can respectively abut against the upper die base 102 above and the stripper plate 106 below; the stripper plate 106 is set at the bottom of the upper die base 102 through the upper die equalizing bolt 103, and the upper die punch 105 is provided in its inner hole.

[0071] The upper die equal-height bolts 103 refer to multiple bolts of equal length used to connect the upper die base 102 and the stripper plate 106, ensuring that the stripper plate 106 maintains a vertical trajectory during movement. Specifically, standard bolts can be used in conjunction with positioning holes, and skew errors are eliminated through equal-height installation. The upper die rectangular spring 104 refers to a helical spring with a rectangular cross-section, sleeved on the outer periphery of the upper die punch 105, used to provide bidirectional elastic pressure. The stripper plate 106 is a plate-like structure with an inner hole, which forms a clearance fit with the upper die punch 105.

[0072] Specifically, during the stamping process, the upper die rectangular spring 104 generates a reverse force when compressed, causing the stripper plate 106 to continuously press against the surface of the blank. When the upper die punch 105 descends and contacts the product strip 300, the stripper plate 106 forms a uniformly distributed pressing force under the spring pressure of the upper die rectangular spring 104, preventing local warping of the blank. After stamping, during the return stroke of the upper die assembly 100, the restoring force of the upper die rectangular spring 104 pushes the stripper plate 106 to separate the upper die punch 105 from the blank, preventing material adhesion. The upper die equalization bolt 103 constrains the degree of freedom of movement of the stripper plate 106, ensuring that it moves only in the vertical direction, eliminating uneven shear stress caused by lateral offset.

[0073] Combination Figures 4 to 9 As shown, the automotive parts semi-shear die structure provided by this utility model can realize the addition of a semi-shear step before the blanking step, and can perform semi-shear on the product strip 300 with a thickness of 0.8mm, with a semi-shear depth of 0.4mm. The specific principle process is as follows: the press slide moves downward and contacts the product strip 300. When the stripper plate 106 presses the product strip 300 to contact the lower template 204, the stripper plate 106 starts to press the material under the action of the upper die rectangular spring 104. The press slide continues to move downward for one upper die pressing stroke. The upper die punch 105 and the lower template 204 shear the outer periphery of the product material 301. The lower die float 207 moves downward. When it reaches the lower dead point of the press slide, the semi-shear at the connection between the product material 301 and the excess material 302 is completed. When the press slide moves upward by one upper die pressing stroke, the stripper plate 106 detaches from the product, and the lower die float 207 lifts the product strip 300 from the cavity of the lower die plate 204. When it reaches the upper dead point of the press slide, one motion cycle is completed.

[0074] By using this semi-shear die structure to add a semi-shearing step to the product strip to be processed before blanking, the product material with a thickness of 0.8mm can be semi-sheared to a depth of 0.4mm, which can effectively improve the flatness of the product mounting surface, meet the requirements of the product drawing, and can be smoothly produced in the stamping die.

[0075] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0076] Secondly, the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0077] Finally, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A semi-shearing mold structure for automotive parts, characterized in that, The assembly includes an upper mold assembly (100), a lower mold assembly (200), and a product strip (300) disposed on the lower mold assembly (200). The lower mold assembly (204) has a lower mold float (207) movably disposed in the inner cavity of the lower mold plate (204) corresponding to the product strip (300). The bottom of the lower mold float (207) is movably mounted on the lower mold base (203) below by a lower mold equalization bolt (205) and a lower mold rectangular spring (206). When the lower mold float (207) moves down to the dead point position, the horizontal height difference Δh between its top plane and the top plane of the lower mold plate (204) is less than the thickness of the product strip (300).

2. The automotive parts semi-shearing mold structure according to claim 1, characterized in that, When the lower mold float (207) moves down to the dead point position, its top plane is lower than the horizontal height of the top plane of the lower template (204), and the horizontal height difference Δh is 1 / 3-2 / 3 of the thickness of the product strip (300).

3. The automotive parts semi-shearing die structure according to claim 2, characterized in that, When the lower mold float (207) moves down to the dead point position, the horizontal height difference Δh between its top plane and the top plane of the lower template (204) is 1 / 2 of the thickness of the product strip (300).

4. The automotive parts semi-shearing die structure according to claim 1, characterized in that, The top end of the lower mold equal-height bolt (205) is fixedly connected to the bottom of the lower mold float (207), and its lower end is movably inserted into the shaft hole of the lower mold base (203). The top of the first limiting boss (2051) at its bottom end is arranged opposite to the bottom of the second limiting boss (2031) on the inner peripheral wall of the shaft hole of the lower mold base (203), forming the upper dead point position of the lower mold float (207).

5. The automotive parts semi-shearing mold structure according to claim 1, characterized in that, The lower mold rectangular spring (206) is movably sleeved on the upper end of the lower mold equal height bolt (205), and its top is in contact with the bottom of the lower mold float (207), and its top is in contact with the top of the second limiting boss (2031) on the inner circumferential wall of the shaft hole of the lower mold base (203).

6. The automotive parts semi-shearing mold structure according to claim 1, characterized in that, The lower mold assembly (200) includes a lower support plate (201), a lower pad (202), a lower mold base (203), and a lower template (204), wherein: The lower mold base (203) is fixedly installed on the lower support plate (201) by the lower pad (202), and the lower template (204) is fixedly installed on its top. The lower template (204) and the lower mold base (203) are movably provided with the lower mold float (207), the lower mold equal height bolt (205) and the lower mold rectangular spring (206) arranged coaxially.

7. The automotive parts semi-shearing die structure according to claim 6, characterized in that, The lower mold assembly (200) further includes a material support assembly (208) disposed upstream and downstream of the lower mold plate (204), wherein: Each of the material support components (208) includes two material support blocks arranged symmetrically on the left and right. The inner sidewall of the material support block is provided with a limiting groove (2081) for installing the product strip (300), and the material support block is mounted on the lower mold base (203) by a return spring at its bottom.

8. The automotive parts semi-shearing die structure according to claim 6, characterized in that, The lower mold assembly (200) further includes a downward positioning block (209) fixedly disposed between the lower template (204) and the lower mold base (203), wherein: The lower positioning block (209) is sleeved on the outside of the lower mold equal height bolt (205) and the lower mold rectangular spring (206) through its inner hole, and the upper edge of its inner hole protrudes inward from the lower edge of the inner hole of the lower template (204) to form a lower positioning dead point (2091) that is limited and connected to the lower edge of the outer periphery of the lower mold float (207).

9. The automotive parts semi-shearing die structure according to claim 1, characterized in that, The upper die assembly (100) includes an upper support plate (101), an upper die base (102), and an upper die punch (105), wherein: The upper mold base (102) is located at the bottom of the upper support plate (101), and the bottom of the upper mold base is provided with the upper mold punch (105) corresponding to the lower mold plate (204).

10. The automotive parts semi-shearing die structure according to claim 9, characterized in that, The upper mold assembly (100) further includes an upper mold equal-height bolt (103), an upper mold rectangular spring (104), and a stripper plate (106), wherein: The upper die rectangular spring (104) is sleeved on the outer periphery of the upper die punch (105), and its top and bottom can respectively abut against the upper die base (102) above and the stripper plate (106) below; The stripper plate (106) is mounted on the bottom of the upper die base (102) by the upper die equalization bolt (103), and the upper die punch (105) is provided in its inner hole.

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