Gearbox cover plate production punching device

Abstract

This invention discloses a stamping device for producing gearbox cover plates, relating to the field of sheet metal stamping technology. It includes a mold body, a mounting handle, a mounting and positioning assembly, a cutting edge, a guide assembly, and a locking assembly. The mounting handle is located at the upper end of the mold body, and both the mounting and positioning assembly and the locking assembly are located on the mounting handle. The cutting edge is located at the lower end of the mold body, and the guide assembly is located on the outer periphery of the mold body. The cutting edge includes a straight section and a circular arc transition section. Multiple sets of chip removal grooves are formed along the contour of the cutting edge. The chip removal grooves extend obliquely from the cutting edge into the mold body and open at the cutting edge, forming a continuous cutting and chip removal transition surface. The spacing between the chip removal grooves in the circular arc transition section is smaller than the spacing in the straight section. This invention can reduce workpiece burrs and mold wear, thereby improving cross-sectional quality, extending mold life, and increasing processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of sheet metal stamping technology, and in particular to a stamping device for producing gearbox cover plates. Background Technology

[0002] In the sheet metal processing field, CNC punching machines are one of the main pieces of equipment for punching, trimming, and forming sheet metal. CNC punching machines use punching dies mounted on a tool holder to punch sheet metal, capable of punching round holes, square holes, oblong holes, and various irregular contours. For products such as gearbox covers, their contours often include irregular hole features with arc segments and rounded corner transitions, which places high demands on the punching dies.

[0003] Currently, traditional punching dies used for punching arcs and irregularly shaped holes mainly adopt a single cutting edge design. The end of the die is equipped with a punching cutting edge that matches the contour of the workpiece. The cutting edge includes a straight section and a circular transition section. After being ground and shaped, it is installed on the tool holder of a CNC punch press. A blanking hole is provided at the corresponding position of the lower die, through which the waste generated during punching is discharged.

[0004] To address the shortcomings of the existing technologies, some improvements have been proposed. For example, some solutions improve waste removal by incorporating chip removal holes or waste removal structures in the die, while others use ejector pins within the punch to assist in chip removal. However, these existing improvements are mostly aimed at conventional punching or general chip removal scenarios. Their chip removal structures are usually independent of the cutting edge or only used to assist in blanking, failing to fundamentally optimize the cutting and chip removal conditions at curved cutting edges. Specifically, existing technologies that use inclined chip removal grooves along the contour direction on the cutting edge sidewall and densely distribute them at curved corners to synergistically improve cutting stress and chip removal have not yet been reported. Therefore, a more effective systematic solution is still needed to address the fundamental problems of severe burrs, difficult chip removal, and short die life in punching of curved and irregular contours. Summary of the Invention

[0005] In order to at least solve one of the above-mentioned technical problems, the present invention aims to provide a stamping device for producing gearbox cover plates, which reduces workpiece burrs and mold wear, thereby improving cross-sectional quality, extending mold life and improving processing efficiency.

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

[0007] A stamping device for producing a gearbox cover plate includes a mold body, a mounting handle, a mounting and positioning component, a cutting edge, a guide component, and a locking component. The mounting handle is located at the upper end of the mold body, and both the mounting and positioning component and the locking component are located on the mounting handle. The cutting edge is located at the lower end of the mold body, and the guide component is located on the outer periphery of the mold body. The cutting edge includes a straight section and a circular arc transition section. Multiple sets of chip removal grooves are formed on the sidewall of the cutting edge along the contour direction of the cutting edge. The chip removal grooves extend obliquely from the cutting edge into the mold body and open at the cutting edge to form a continuous cutting and chip removal transition surface. The spacing between the chip removal grooves in the circular arc transition section of the cutting edge is smaller than the spacing between the straight sections of the cutting edge.

[0008] Preferably, the mold body is integrally machined from high-hardness alloy tool steel and then heat-treated and quenched; the high-hardness alloy tool steel is Cr12MoV.

[0009] Preferably, the overall contour of the punching edge is an irregular hole shape with rounded corners.

[0010] Preferably, the cross-section of the chip removal groove is a V-shaped groove or a dovetail groove; the chip removal grooves are arranged at intervals along the contour of the punching cutting edge.

[0011] Preferably, the mounting and positioning component includes one or more of a positioning plane, a positioning groove, a positioning hole, or a positioning boss; the guiding component includes a guide groove or a guide surface disposed along the outer periphery of the mold body.

[0012] Preferably, the locking assembly includes one or more of a locking boss, a locking groove, a locking hole, or a locking thread. The locking assembly is disposed on the mounting handle and is used to cooperate with the CNC punch press tool holder to fix the mold.

[0013] Preferably, the cutting edge is integrally formed by the die body, and the chip removal groove is integrally formed by the cutting edge; the depth of the chip removal groove is 10% to 50% of the height of the cutting edge.

[0014] Preferably, the surface of the cutting edge is provided with a wear-resistant coating, which is one of TiN coating, TiCN coating, CrN coating or DLC coating.

[0015] Preferably, the chip removal groove is provided with a lubrication groove extending along the groove body, and the lubrication groove is connected to a lubrication channel provided in the mold body for conveying lubricating medium to the chip removal groove.

[0016] The present invention has the following beneficial effects:

[0017] This invention effectively improves the chip removal performance during punching and enhances the quality of the punched surface. By creating multiple sets of chip removal grooves along the contour of the punching edge on the sidewall, and extending these grooves inclined inwards from the punching edge towards the interior of the die body, a continuous cutting and chip removal transition surface is formed. This allows chips generated during the stamping process to be promptly discharged along the chip removal grooves after cutting, reducing the retention and accumulation of waste chips near the cutting edge. Compared to traditional methods relying on blanking holes or auxiliary waste removal structures, this invention directly optimizes the chip removal path in the cutting edge area, making the cutting and chip removal process more continuous and smooth. This reduces secondary chip compression and repeated cutting, effectively reducing burrs, scratches, and tearing on the workpiece, improving the flatness and dimensional accuracy of the punched surface, and meeting the high-quality processing requirements of irregularly shaped parts such as gearbox covers.

[0018] This invention improves the punching stability of the arc transition region and reduces localized die wear. Based on the stress characteristics of different areas of the punching edge, it employs a differentiated chip removal design for the arc transition section and the straight section. The spacing of the chip removal grooves in the arc transition section is smaller than that in the straight section, resulting in a higher density of chip removal channels in the arc region. Since the arc transition region typically experiences greater local stress during punching and chips tend to accumulate there, this invention increases the chip removal capacity in this region, allowing chips to be discharged promptly. This reduces cutting resistance and frictional heat accumulation in the arc region, lowers the risk of localized edge wear and chipping, improves the uniformity of stress during punching, and maintains a better cutting edge condition for the die over a long period, further extending the die's service life.

[0019] This invention improves the overall strength and wear resistance of the mold. The mold body is integrally machined from high-hardness alloy tool steel and then heat-treated and quenched to enhance its overall hardness, compressive strength, and impact resistance. Simultaneously, the cutting edge is integrally machined with the mold body, avoiding loose connections and positioning errors that may occur with traditional assembly structures, thus improving the overall structural rigidity and stress stability. Furthermore, combining it with wear-resistant coatings such as TiN, TiCN, CrN, or DLC coatings effectively reduces friction and wear during the punching process, improves the wear resistance and anti-adhesion properties of the cutting edge, reduces cutting edge dulling caused by long-term punching, and lowers maintenance frequency and operating costs.

[0020] This invention improves mold installation accuracy and processing stability by employing a combination of a positioning component, a guiding component, and a locking component to achieve rapid positioning, accurate installation, and reliable locking of the mold on the CNC punch press tool holder. The positioning component ensures accurate and consistent installation, the guiding component improves the installation and movement guidance accuracy of the mold, and the locking component ensures the mold remains stable and fixed during continuous stamping, avoiding punching position deviations and processing errors caused by installation deviations or loosening, thus improving the consistency and reliability of continuous processing.

[0021] This invention improves lubrication and reduces cutting resistance by incorporating a lubrication groove extending along the groove body within the chip removal channel. A lubricating medium is continuously supplied to the lubrication groove through a lubrication channel, allowing the lubricating medium to directly act on the cutting edge and chip removal area, creating a stable lubrication environment during the stamping process. The lubricating medium reduces frictional resistance between the workpiece and the cutting edge, decreases heat generation and material adhesion during stamping, improves chip removal efficiency, further reduces cutting edge wear, and enhances the stability and service life of the die during continuous operation.

[0022] This invention improves the overall performance of irregular contour stamping. It organically combines a rounded corner irregular contour punching cutting edge, an inclined chip removal groove, a dense chip removal design in the arc area, an integrated cutting edge structure, high-strength mold material, a wear-resistant coating, a mounting and positioning structure, a guiding structure, a locking structure, and a lubrication structure. These components work together to create a stamping device that combines high-efficiency cutting, high-efficiency chip removal, high-precision guidance, reliable installation, and durable use. The synergistic effect of these technical features not only effectively solves problems such as severe burrs, difficult chip removal, easy wear of the cutting edge, and insufficient processing stability in existing irregular contour punching processes, but also significantly improves the continuous processing efficiency, processing quality, and mold life of complex sheet metal parts such as gearbox cover plates. It has good engineering application value and promising prospects for widespread application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0025] Figure 2 This is a cross-sectional view of the mold body side plate according to an embodiment of the present invention.

[0026] In the figure: 1. Mold body; 2. Mounting handle; 3. Mounting and positioning component; 4. Punching edge; 41. Straight section; 42. Arc transition section; 5. Guide component; 6. Locking component; 7. Chip removal groove; 8. Wear-resistant coating; 9. Lubrication groove; 10. Lubrication channel. Detailed Implementation

[0027] 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.

[0028] like Figures 1 to 2 As shown, a stamping device for producing a gearbox cover plate includes a mold body 1, a mounting handle 2, a mounting and positioning component 3, a cutting edge 4, a guide component 5, and a locking component 6. The mounting handle 2 is located at the upper end of the mold body 1, the mounting and positioning component 3 and the locking component 6 are both located on the mounting handle 2, the cutting edge 4 is located at the lower end of the mold body 1, and the guide component 5 is located on the outer periphery of the mold body 1.

[0029] This section defines the overall structure of the stamping device. The mounting handle 2 connects the die to the tool holder of the CNC punch press; the mounting and positioning assembly 3 ensures the die is always in the same position during installation; the locking assembly 6 ensures the die does not loosen during stamping; and the guiding assembly 5 guides the die to move in a predetermined direction. These structures together form the basis for the die's installation and movement, providing the prerequisite for the cutting edge 4 to complete the stamping action at a precise position.

[0030] The guide component 5 can be set as a guide surface that cooperates with the punch press slide rail, or it can be set as a guide groove on the outer periphery of the mold body 1. Its function is to absorb the lateral force during the stamping process and prevent the cutting edge from deflecting.

[0031] The cutting edge 4 includes a straight section 41 and an arc transition section 42. The sidewall of the cutting edge 4 has multiple sets of chip removal grooves 7 along the contour direction of the cutting edge 4. The chip removal grooves 7 extend obliquely from the cutting edge 4 into the mold body 1 and open at the cutting edge 4 to form a continuous cutting and chip removal transition surface.

[0032] This section defines the structure and layout of the chip removal groove 7. The chip removal groove 7 is located on the side wall of the cutting edge and extends obliquely into the mold, allowing the chips generated after the cutting edge cuts the material during the punching process to be smoothly guided into the mold's internal channel along the oblique groove wall, rather than remaining near the cutting edge. The design of opening at the punching cutting edge 4 ensures direct connection between the cutting edge and the chip removal path, allowing the cutting and chip removal actions to proceed continuously, reducing interference from chips to subsequent cutting.

[0033] The spacing of the chip removal grooves 7 in the arc transition section 42 of the punching edge 4 is smaller than the spacing of the straight section 41 of the punching edge 4.

[0034] This section defines the differentiated distribution characteristics of the chip removal grooves 7. The arc transition section 42 experiences greater stress and more complex material flow during punching, making it easier for chips to accumulate in this area. Reducing the spacing of the chip removal grooves 7 in this region is equivalent to locally increasing the density of the chip removal channels, allowing chips generated in the arc section to be discharged more quickly and reducing their residence time on the cutting edge sidewall. Simultaneously, the denser chip removal grooves 7 divide the cutting edge of the arc section into smaller cutting units, dispersing the cutting force in this region and reducing local stress peaks, thereby reducing the risk of chipping and burr formation.

[0035] like Figures 1 to 2 As shown, the mold body 1 is integrally machined from high-hardness alloy tool steel and then heat-treated and quenched; the high-hardness alloy tool steel is Cr12MoV.

[0036] This preferred solution limits the mold material and processing technology. Cr12MoV possesses high hardness, high wear resistance, and good hardenability. The integral machining process avoids connection gaps and positioning errors in assembled structures, while heat treatment quenching further improves the base material hardness. This solution enables the mold to possess sufficient compressive strength and impact toughness, capable of withstanding repeated loads during stamping, and delaying edge wear and deformation.

[0037] like Figures 1 to 2 As shown, the overall outline of the punching edge 4 is a non-circular hole shape with rounded corners.

[0038] This preferred embodiment clarifies the profile type of the punching edge 4. Rounded corner irregular holes are typical features of parts such as gearbox covers, and their profiles consist of a composite curve of straight lines and arcs. This limitation indicates that the device is specifically designed for this type of irregular profile, ensuring that the differentiated distribution scheme of the chip removal grooves 7 matches the stress characteristics of this type of profile.

[0039] like Figures 1 to 2 As shown, the cross-section of the chip removal groove 7 is a V-shaped groove or a dovetail groove; the chip removal groove 7 is arranged at intervals along the contour of the punching cutting edge 4.

[0040] This preferred design defines the cross-sectional shape and arrangement of the chip removal grooves 7. The V-groove is simple to machine and ensures smooth chip removal, while the dovetail groove has a self-locking angle that helps guide waste chips outwards. The staggered arrangement along the contour ensures that the chip removal channels are evenly distributed throughout the entire circumference of the cutting edge, avoiding blind spots in chip removal.

[0041] For V-grooves or dovetail grooves, the angle between the groove bottom and the groove wall can be set to an acute or obtuse angle that facilitates the sliding out of waste chips. The specific angle can be adjusted according to the thickness and hardness of the punching material to ensure that the waste chips slide off smoothly under gravity or punching thrust.

[0042] like Figures 1 to 2As shown, the mounting and positioning component 3 includes one or more of a positioning plane, a positioning groove, a positioning hole, or a positioning boss; the guiding component 5 includes a guide groove or a guide surface provided along the outer periphery of the mold body 1.

[0043] This preferred embodiment defines the specific implementation of the mounting, positioning, and guiding component 5. The positioning plane provides a reference surface, and the positioning groove and positioning hole cooperate with the corresponding structure on the tool holder to achieve precise positioning. The positioning boss is embedded in the groove of the tool holder to prevent rotation. The guide groove or guide surface cooperates with the press guide rail to ensure the straightness of the die's up and down movement and reduce the impact of runout on the punching accuracy.

[0044] like Figures 1 to 2 As shown, the locking assembly 6 includes one or more of a locking boss, a locking groove, a locking hole, or a locking thread. The locking assembly 6 is disposed on the mounting handle 2 and is used to cooperate with the CNC punch press tool holder to fix the mold.

[0045] This preferred embodiment defines the specific structure of the locking assembly 6. The locking boss or locking groove engages with the jaws on the tool holder for quick clamping, and the locking hole or locking thread is securely fixed via bolt connection. This design ensures that the die does not experience axial movement or circumferential rotation during high-speed continuous stamping, guaranteeing consistency in the cutting position for each stroke.

[0046] like Figures 1 to 2 As shown, the cutting edge 4 is integrally formed by the mold body 1, and the chip removal groove 7 is integrally formed by the cutting edge 4; the depth of the chip removal groove 7 is 10% to 50% of the height of the cutting edge 4.

[0047] This preferred embodiment limits the machining method and groove depth range of the cutting edge and chip removal groove 7. Integrated machining avoids the risks of interface cracks and detachment that may occur with welding or inlay structures, ensuring the continuity of stress transmission when the cutting edge is under load. The groove depth is controlled between 10% and 50% of the cutting edge height; too shallow and the chip removal capacity is insufficient, too deep and the supporting strength of the cutting edge base is weakened. This range ensures smooth chip removal while maintaining the overall rigidity of the cutting edge.

[0048] like Figures 1 to 2 As shown, the surface of the punching edge 4 is provided with a wear-resistant coating 8, which is one of TiN coating, TiCN coating, CrN coating or DLC coating.

[0049] This preferred embodiment specifies the coating material for the cutting edge surface. TiN coatings possess high hardness and good general wear resistance, TiCN coatings have even higher hardness and a lower coefficient of friction, CrN coatings exhibit excellent anti-adhesion properties, and DLC coatings have an extremely low coefficient of friction and a smooth surface. These coatings can form a physical isolation layer at the interface between the cutting edge and the workpiece, reducing frictional heat and adhesive wear, and extending the sharpness retention time of the cutting edge.

[0050] like Figures 1 to 2 As shown, the chip removal groove 7 is provided with a lubrication groove 9 extending along the groove body. The lubrication groove 9 is connected to the lubrication channel 10 provided in the mold body 1, and is used to deliver lubrication medium to the chip removal groove 7.

[0051] This preferred embodiment defines the configuration of the lubrication structure. The lubrication groove 9 extends along the direction of the chip removal groove 7, and the lubrication channel 10 introduces the lubricating medium into the chip removal area from inside the die body 1. During the stamping process, the lubricating medium continuously seeps out through the lubrication groove 9, covering the chip removal groove 7 and the cutting edge surface. On the one hand, this reduces the frictional resistance between the chips and the groove wall, helping the chips to slide out more smoothly; on the other hand, it forms a lubricating film between the cutting edge and the workpiece, reducing cutting force and temperature rise, further reducing the risk of cutting edge wear and workpiece surface scratches.

[0052] The lubrication channel 10 in this design needs to be connected to an external lubrication supply system. A lubrication interface can be provided on the mounting handle 2 to continuously or intermittently supply lubricating medium during the stamping process, achieving automatic lubrication. The lubricating medium can be stamping-specific oil or emulsion, and its flow rate can be adjusted according to the stamping speed and material thickness.

[0053] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A stamping apparatus for producing gearbox cover plates, characterized in that, The mold includes a mold body (1), a mounting handle (2), a mounting and positioning component (3), a cutting edge (4), a guide component (5), and a locking component (6). The mounting handle (2) is located at the upper end of the mold body (1), the mounting and positioning component (3) and the locking component (6) are both located on the mounting handle (2), the cutting edge (4) is located at the lower end of the mold body (1), and the guide component (5) is located on the outer periphery of the mold body (1). The cutting edge (4) includes a straight line. The sidewall of the cutting edge (4) has multiple sets of chip removal grooves (7) along the contour direction of the cutting edge (4). The chip removal grooves (7) extend obliquely from the cutting edge (4) into the mold body (1) and open at the cutting edge (4) to form a continuous cutting and chip removal transition surface. The arrangement spacing of the chip removal grooves (7) in the arc transition section (42) of the cutting edge (4) is smaller than the arrangement spacing of the straight section (41) of the cutting edge (4).

2. The stamping device for producing a gearbox cover plate according to claim 1, characterized in that, The mold body (1) is integrally machined from high-hardness alloy tool steel and then heat-treated and quenched; the high-hardness alloy tool steel is Cr12MoV.

3. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The overall outline of the punching edge (4) is a non-circular hole shape with rounded corners.

4. The stamping device for producing a gearbox cover plate according to claim 1, characterized in that, The cross-section of the chip removal groove (7) is a V-shaped groove or a dovetail groove; the chip removal groove (7) is arranged at intervals along the contour of the punching cutting edge (4).

5. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The mounting and positioning component (3) includes one or more of a positioning plane, a positioning groove, a positioning hole, or a positioning boss; the guiding component (5) includes a guide groove or a guide surface provided along the outer periphery of the mold body (1).

6. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The locking assembly (6) includes one or more of a locking boss, a locking groove, a locking hole, or a locking thread. The locking assembly (6) is disposed on the mounting handle (2) and is used to cooperate with the CNC punch press tool holder to fix the mold.

7. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The cutting edge (4) is integrally formed by the mold body (1), and the chip removal groove (7) is integrally formed by the cutting edge (4); the depth of the chip removal groove (7) is 10% to 50% of the height of the cutting edge (4).

8. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The surface of the cutting edge (4) is provided with a wear-resistant coating (8), which is one of TiN coating, TiCN coating, CrN coating or DLC coating.

9. The stamping apparatus for producing a gearbox cover plate according to claim 1, characterized in that, The chip removal groove (7) is provided with a lubrication groove (9) extending along the groove body. The lubrication groove (9) is connected to the lubrication channel (10) provided in the mold body (1) and is used to deliver lubrication medium to the chip removal groove (7).

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