Forming device and forming method for a two-sided round cornered alloy piece

Abstract

The application discloses a forming device and forming method of a double-side round-corner alloy piece. The material belt is intermittently moved from a first station to a second station, and sequentially passes through a stress groove processing station, a reverse stamping station and a positive stamping station. The stress release, round-corner preforming and product separation can be sequentially completed in the continuous processing process, and the position accuracy and production efficiency between the processing steps are improved. The stress release groove can provide a release space for material deformation in the subsequent stamping process, and reduce the deformation caused by the transmission of stamping force to the surrounding material belt. The reverse stamping makes the material belt form a convex part with a first round corner, thereby preforming the edge shape of one side of the alloy piece. The positive stamping makes the convex part separate from the material belt and form a second round corner. Thus, the double-side round corner can be obtained in the alloy piece forming and separation process, the batch edge and edge collapse are reduced, the forming accuracy and consistency of the alloy piece are improved, the subsequent independent polishing process is saved, and the occupation of equipment and production space is reduced.

Description

Technical Field

[0001] This disclosure relates to the technical field of alloy die forging equipment, specifically to a forming apparatus and method for a double-sided rounded corner alloy part. Background Technology

[0002] Alloy forgings are characterized by high strength, good wear resistance, and high dimensional stability, and are widely used in electronic equipment, precision instruments, and mechanical assembly structures. For example, the magnetic snap-fit ​​sheet on a graphics card typically needs to interlock with other structures on the card, serving functions such as positioning, connection, or magnetic conduction. These alloy parts are usually formed by stamping thin alloy strips, and their contour dimensions, edge shape, and surface quality directly affect assembly accuracy and operational stability. Therefore, high requirements are placed on forming accuracy and edge smoothness.

[0003] Existing alloy parts such as snap-fit ​​magnetic sheets are typically formed from strip material in a single stamping process. During stamping, the punch first compresses the strip, causing plastic deformation, and then the product separates from the strip through shearing action between the punch and the die. Because the stamping pressure on the strip is concentrated near the product contour, one edge of the product is prone to forming a large dent, while the other edge is prone to fracture bands and burrs. Especially when the alloy material has high hardness, the product thickness is small, or the product contour dimensions are precise, the burrs and dents generated during stamping are even more difficult to control, making it difficult to simultaneously form smooth and uniformly sized rounded corners on both surfaces of the product.

[0004] To eliminate burrs formed during stamping, existing technologies typically involve sending the product to separate grinding, polishing, or chamfering equipment for secondary processing after stamping. Alternatively, the product edges can be manually ground. However, separate grinding equipment requires additional production space and adds product transfer, positioning, and clamping processes, resulting in a longer production process and higher equipment investment and production costs. After the product is transferred from the stamping equipment to the grinding equipment, it needs to be repositioned, which can easily lead to positioning errors. Furthermore, the processing force and grinding angle of manual grinding are difficult to maintain consistently, easily resulting in uneven corner radii, excessive localized wear, or burr residue on the product edges, making it difficult to ensure the consistency of batch products. Therefore, existing technologies for processing alloy forgings such as snap-fit ​​magnetic sheets suffer from insufficient precision and excessive space requirements.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure. Summary of the Invention

[0006] The purpose of this disclosure is to provide a forming apparatus and method for double-sided rounded corner alloy parts, which solves the technical problems of insufficient precision and large space occupation in the processing of alloy forging parts such as snap-fit ​​magnetic sheets in the prior art.

[0007] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0008] According to one aspect of this disclosure, a method for forming a double-sided rounded corner alloy part is provided, comprising: A material strip is provided, which is then intermittently moved from the first station to the second station; between the first station and the second station, there are sequentially arranged a stress groove processing station, a back stamping station, and a forward stamping station; Stress relief grooves are machined on the portion of the strip located at the stress groove machining position; The portion of the strip located at the back-pressing station is back-pressed, causing the strip to be pressed to form a protrusion with a first rounded corner; The portion of the strip located at the positive stamping station is positively stamped to separate the protrusion from the strip, resulting in an alloy part with a first rounded corner and a second rounded corner.

[0009] In some embodiments of this disclosure, based on the foregoing scheme, the stress groove machining position includes a first groove machining position and a second groove machining position arranged sequentially along the moving direction; The portion of the stress relief groove located at the stress groove machining position of the material strip includes: A first stress groove is processed on the portion of the material strip located at the first groove processing position. The first stress groove is spaced on the material strip along the moving direction and extends along a first direction perpendicular to the moving direction. A second stress groove is machined on the portion of the material strip located at the second groove processing position. The second stress groove is located between the two first stress grooves and is located on one side of the protrusion in the first direction.

[0010] In some embodiments of this disclosure, based on the foregoing scheme, in a first direction, the strip is processed with a plurality of protrusions at intervals, and the position of the strip corresponding to the processing of the protrusions is a forming position; the groove wall of the first stress groove extends into a first region, and the first region is the region between any two adjacent forming positions in the first direction; The process of machining the first stress groove on the portion of the material strip located at the first groove machining position includes: The material strip is subjected to pressure twice by a pre-set first groove cutter, so that the first stress groove is formed on both sides of the material strip along the moving direction at the forming position.

[0011] In some embodiments of this disclosure, based on the foregoing scheme, the minimum distance between any two adjacent molding positions in the first direction is the first distance, and the groove wall of the first stress groove extends into the first region, so that the distance between the first stress groove and the molding position is the second distance, and the second distance is less than the first distance.

[0012] In some embodiments of this disclosure, based on the foregoing scheme, the first spacing is obtained by using a second spacing, including: A test strip with the same material and thickness as the strip is provided. A test forming position is set on the test strip, and the distance between the test stress groove processed around the test forming position and the test forming position is the second distance. Along a first direction, a plurality of strain measurement positions are determined at intervals between the edge of the test molding position and the test stress groove, and the distance between each strain measurement position and the edge of the test molding position is denoted as x; The test forming position is subjected to the back stamping and the forward stamping in sequence. The dimensional changes of each strain measurement position before and after stamping are obtained, and the equivalent plastic strain ε corresponding to each strain measurement position is obtained based on the dimensional changes. （x） ; Obtain the allowable equivalent plastic strain ε of the test strip. a Within the range greater than 0 and less than the second spacing, it is determined that 2ε is satisfied. （x） ≤ ε a The minimum distance x0; The first spacing D1 is determined according to the following formula: D1 = 2x0; The positions of two adjacent forming positions in the first direction are determined according to the first spacing D1, such that the middle position between the two adjacent forming positions is respectively separated from the edge spacing x0 of the two forming positions.

[0013] In some embodiments of this disclosure, based on the foregoing scheme, the second stress groove extends along the moving direction and the distance between it and the forming position is the second distance.

[0014] In some embodiments of this disclosure, based on the foregoing scheme, a guide hole station is provided between the first station and the stress groove processing station; The process of machining the stress relief groove before the stress relief groove at the stress groove machining position of the material strip also includes: A guide channel is opened for the portion of the material strip located at the guide hole station; The process of machining stress relief grooves on the portion of the strip located at the stress groove machining position, the process of back-pressing the portion of the strip located at the back-pressing station, and the process of forward-pressing the portion of the strip located at the forward-pressing station all include: Insert the guide pin into the guide channel to position the material strip.

[0015] In some embodiments of this disclosure, based on the foregoing scheme, a cutting station is provided between the positive stamping station and the second station; After the portion of the strip located at the positive stamping station is positively stamped, the process further includes: The portion of the material strip located at the cutting station is cut off from the material strip.

[0016] According to one aspect of this disclosure, a forming apparatus for a double-sided rounded corner alloy part is provided, employing the forming method described above, including a lower mold and an upper mold, the upper mold being able to press down relative to the lower mold, the upper mold being sequentially equipped with a first grooving cutter, a second grooving cutter, a back punch, and a forward punch along the moving direction of the material strip; the lower mold is provided with a back punch bottom post corresponding to the position of the first back punch.

[0017] According to one aspect of this disclosure, a double-sided rounded corner alloy part is provided, obtained by the forming method described above, comprising an alloy part having rounded corners on both opposite sides.

[0018] As can be seen from the above technical solutions, the forming apparatus and forming method for the double-sided rounded corner alloy parts in the exemplary embodiments of this disclosure, and the alloy parts obtained based on the above forming apparatus or method, have at least the following advantages and positive effects: The forming apparatus and method for double-sided rounded corner alloy parts disclosed in this application, by intermittently moving the strip from the first station to the second station and sequentially passing through the stress groove processing station, the back stamping station, and the forward stamping station, can sequentially complete stress release, rounded corner pre-forming, and product separation during continuous processing, improving the positional accuracy and production efficiency between each processing step. The stress release groove provides space for material deformation during subsequent stamping, reducing deformation caused by the transfer of stamping pressure to the surrounding strip; the back stamping forms a protrusion with a first rounded corner on the strip, thereby pre-forming the edge shape on one side of the alloy part; the forward stamping separates the protrusion from the strip and forms a second rounded corner. Thus, double-sided rounded corners can be obtained during the forming and separation of the alloy part, reducing burrs and edge collapse, improving the forming accuracy and consistency of the alloy part, and eliminating the need for subsequent independent grinding processes, reducing equipment and production space occupation.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0022] Figure 1 This is a schematic diagram of the overall structure of the forming device for the double-sided rounded corner alloy parts in this embodiment; Figure 2 This is a first exploded structural diagram of the forming apparatus for the double-sided rounded corner alloy part in this embodiment; Figure 3 This is a second exploded structural diagram of the forming apparatus for the double-sided rounded corner alloy part in this embodiment; Figure 4 This is a top view of the forming device for the double-sided rounded corner alloy part in this embodiment; Figure 5 The figure shows a schematic diagram of the cross-sectional structure along point AA; Figure 6 This is a top view of the material strip structure in this embodiment; Figure 7 This is a schematic diagram of the alloy component in this embodiment; Illustrations: 001, First station; 002, Second station; 003, Stress groove machining station; 0031, First groove machining station; 0032, Second groove machining station; 004, Back stamping station; 005, Forward stamping station; 006, Forming station; 007, Hole guiding station; 008, Cutting station; 100. Material strip; 101. Stress relief groove; 1011. First stress groove; 1012. Second stress groove; 110. Protrusion; 111. First fillet; 112. Second fillet; 120. Guide channel; 200, Alloy part; 300, First grooving cutter; 400, Second grooving cutter; 510, Back punch; 520, Back punch bottom; 600, Forward punch; 700, Guide cutter; 800, Cutting cutter. Detailed Implementation

[0023] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0025] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1: Please see Figures 1 to 5 This embodiment provides a forming apparatus for a double-sided rounded corner alloy part. This forming apparatus can be a continuous stamping die, including an upper die and a lower die arranged opposite each other. The upper die can reciprocate downward relative to the lower die under the drive of the stamping equipment, and the strip 100 passes between the upper die and the lower die. A continuous stamping die refers to a die that can set multiple processing positions along the moving direction of the strip 100 in the same die set, and simultaneously perform different processing operations on portions of the strip 100 at different processing positions after the strip 100 moves by a preset step distance each time. Using a continuous stamping die can reduce the errors caused by the transfer and repositioning of the strip 100 between different devices.

[0027] In this embodiment, the strip 100 can be made of stainless steel, iron-nickel alloy, soft magnetic alloy, or other alloy strips capable of plastic deformation. The length direction of the strip 100 is the direction of movement, and the direction perpendicular to the direction of movement and located in the plane of the strip 100 is the first direction. The strip 100 can be intermittently fed by a servo feeder, roller feeder, or clamping feeding mechanism. Intermittent feeding means that the strip 100 moves a preset step distance when the upper and lower dies separate and stops before the upper die presses down, so that the strip 100 remains relatively stationary during each stamping.

[0028] The first station 001 can be understood as the feeding position where the strip 100 enters the continuous stamping die, and the second station 002 can be understood as the exit position where the strip 100 leaves the continuous stamping die after completing the preset processing. Along the movement direction, between the first station 001 and the second station 002, there are sequentially arranged a hole guiding station 007, a stress groove processing station 003, a back stamping station 004, a forward stamping station 005, and a cutting station 008. The stress groove processing station 003 includes a first groove processing station 0031 and a second groove processing station 0032. It can be understood that each station represents the position where the strip 100 receives the corresponding processing, and the distance between each station can be set according to the feeding step distance of the feeding mechanism and the die size.

[0029] like Figure 2 and Figure 3 As shown, the upper mold is sequentially equipped with a guide cutter 700, a first grooving cutter 300, a second grooving cutter 400, a back punch 510, a forward punch 600, and a cutting cutter 800 along the moving direction. The lower mold is equipped with cutting edges, receiving holes, or forming inserts adapted to the above-mentioned cutters, and a back punch bottom post 520 is provided at a position corresponding to the back punch 510. The above-mentioned cutters can be made of cemented carbide, high-speed tool steel, or other materials with sufficient hardness and wear resistance, and can be installed on the upper or lower mold with a detachable insert structure so that they can be replaced individually after the cutting edges wear.

[0030] The guide cutter 700 is used to process the guide channel 120 on the strip 100 at the hole guide station 007. The guide channel 120 is a positioning structure for inserting guide pins and for determining the position of the strip 100 relative to each processing station. It can be a circular guide hole, an oblong guide hole, or a guide groove extending along the movement direction. In one specific embodiment, the strip 100 is provided with multiple sets of guide channels 120 at intervals along the movement direction. When the upper die is pressed down, the guide pin enters the guide channel 120 before the corresponding stamping cutter to correct the cumulative error generated by the feeding mechanism. Then, the first grooving cutter 300, the second grooving cutter 400, the back punch 510, and the forward punch 600 process the strip 100. As a result, the coaxiality and contour position accuracy between the stress relief groove 101, the protrusion 110, and the alloy part 200 can be improved.

[0031] The first grooving tool 300 is used to process the first stress groove 1011 at the first grooving position 0031. The first stress groove 1011 extends along a first direction and is spaced apart on the strip 100 along the moving direction. The first grooving tool 300 may have a straight, curved, or concave cutting edge profile; in Figure 6In the illustrated embodiment, the groove wall of the first stress groove 1011 extends toward the first region between two adjacent forming positions 006 in the first direction, so that the first stress groove 1011 can be disposed close to the outer periphery of the plurality of forming positions 006. The forming position 006 refers to the region on the strip 100 where a protrusion 110 is to be formed and the alloy part 200 is eventually obtained.

[0032] For each preset step distance moved by the strip 100, the first grooving cutter 300 applies a punching pressure to the strip 100. After two consecutive punching strokes at the first grooving processing position 0031, the first grooving cutter 300 successively forms two first stress grooves 1011 on both sides of the forming position 006 along the moving direction. By using the same first grooving cutter 300 to process the two first stress grooves 1011 in two steps, the number of cutters can be reduced, and the preset feeding step distance of the strip 100 can be used to ensure the relative position between the two first stress grooves 1011.

[0033] The second grooving cutter 400 is used to process the second stress groove 1012 at the second grooving processing position 0032. The second stress groove 1012 extends along the moving direction, is located between the two first stress grooves 1011, and is located on one side of the corresponding protrusion 110 or forming position 006 in the first direction. The first stress grooves 1011 and the second stress grooves 1012 together constitute the stress relief groove 101. In one specific embodiment, the first stress grooves 1011 and the second stress grooves 1012 are spaced apart from each other around the forming position 006 and are not completely connected, so that a plastically deformable material frame is formed around the forming position 006, while retaining the continuous material portion connecting the material frame and the rest of the strip 100, to prevent the semi-finished product from detaching from the strip 100 before entering the positive stamping station 005.

[0034] The stress relief groove 101 refers to a groove-shaped structure that blocks or weakens the transmission of stamping stress to the outer strip by partially cutting the strip 100. Its width can be determined by the cutting edge width of the first grooving cutter 300 and the second grooving cutter 400, and its contour can be adapted to the outer periphery of the alloy part 200. For example, when the alloy part 200 is a circular sheet, the groove walls of the first stress groove 1011 and the second stress groove 1012 facing the forming position 006 can adopt an arc-shaped structure adapted to the outer periphery of the forming position 006; when the alloy part 200 is a rectangular or irregularly shaped part, the corresponding groove walls can also adopt a structure combining straight segments and arc transition segments.

[0035] like Figure 5As shown, the ejector pin 510 and the ejector pin 520 cooperate to form a back-pressing structure. Back-pressing refers to applying a pressing force to the strip 100 that is opposite to the direction of subsequent forward pressing or the opposite to the forming action, causing the forming position 006 to first form a protrusion 110 that is not completely separated from the strip 100. The ejector pin 510 can be elastically installed in the upper die and obtain pre-pressure through springs, elastic pads, or pneumatic structures; the ejector pin 520 can be fixed or height-adjustable in the lower die. When the upper die is pressed down, the ejector pin 510 and the ejector pin 520 clamp and press the strip 100, causing the material at the forming position 006 to plastically flow along the back-pressing contour.

[0036] The forming edge of the ejector pin 510 or ejector pin 520 is provided with an arc surface that matches the first fillet 111. When the forming position 006 is pressed to form the protrusion 110, the edge material on one side of the protrusion 110 flows along the arc surface, thereby forming the first fillet 111. The first fillet 111 is an arc transition structure between the first surface of the protrusion 110 and its peripheral surface, and its fillet radius can be determined by the forming arc radius of the ejector pin 510 or ejector pin 520. Compared with the natural collapse corner formed by direct punching, forming the first fillet 111 by extrusion using the arc surface of the die can improve the consistency of the fillet size.

[0037] In one alternative embodiment, the backflush height of the protrusion 110 can be set to be less than the thickness of the strip 100, so that the protrusion 110 obtains the plastic deformation required to form the first fillet 111, while retaining continuous material between the protrusion 110 and the strip 100, so that the semi-finished product after backflushing is still held in the strip 100 and moves with the strip 100 to the forward stamping station 005. It should be understood that the backflush height can also be adjusted according to the material elongation, thickness of the strip 100, and the target radius of the first fillet 111.

[0038] The punching tool 600 is used to punch the already formed protrusion 110 at the punching station 005. Punching refers to extruding and cutting the protrusion 110 along the product stripping direction, separating the protrusion 110 from the strip 100, and forming a second rounded corner 112 on the side opposite to the first rounded corner 111. The lower die forming insert that cooperates with the punching tool 600 can be provided with a forming cavity for accommodating the alloy part 200. The working contour of the punching tool 600 and the contour of the forming cavity are set according to the target shape of the alloy part 200.

[0039] In one alternative embodiment, the working profile dimension of the forming insert used in the forward punching can be set to be smaller than the target profile dimension of the alloy part 200, so that the protrusion 110 enters the forming insert in an interference fit. The edge material of the protrusion 110 flows towards the rounded corner surface after being compressed between the forward punch 600 and the forming insert, thereby compressing the burr near the punching fracture surface and forming a second rounded corner 112, while also reducing the large collapse surface that is easily generated in a single punching operation. The aforementioned working profile dimension can actually be adjusted according to the hardness of the alloy material, the thickness of the strip 100, the die clearance, and the target rounded corner dimension.

[0040] A cutting tool 800 is positioned at cutting station 008 to cut the remaining scrap material into segments after the alloy part 200 separates from the strip 100. The cutting tool 800 can be a straight-edged tool or a non-circularly shaped tool adapted to the contour of the scrap material. Cutting the continuous scrap material into shorter pieces facilitates the discharge of scrap from the continuous stamping die and prevents scrap from accumulating at the second station 002, which would affect the normal feeding of the strip 100.

[0041] Therefore, this embodiment integrates the guide tool 700, the first grooving tool 300, the second grooving tool 400, the back punch 510, the forward punch 600, and the cutting tool 800 into the same continuous stamping die, so that the strip 100 can complete positioning, stress relief, first rounded corner preforming, product separation, second rounded corner forming, and scrap cutting in one continuous feeding process, reducing independent grinding equipment and product transfer processes. At the same time, the stress relief groove 101 is used to control the material flow around the forming position 006, reducing the warping of the outer strip and the irregular deformation of the edge of the alloy part 200.

[0042] Example 2: The forming method for the double-sided rounded corner alloy part in this embodiment is applied to the forming apparatus in Embodiment 1, and includes: S1. Provide a material strip 100, and allow the material strip 100 to move intermittently from the first station 001 to the second station 002; between the first station 001 and the second station 002, there are sequentially arranged a stress groove processing station 003, a back stamping station 004 and a forward stamping station 005; S2. Process stress relief groove 101 on the part of the material strip 100 located at stress groove processing position 003; S3. The portion of the strip 100 located at the back stamping station 004 is back stamped, so that the strip 100 is pressed to form a protrusion 110 with a first rounded corner 111. S4. Perform forward stamping on the portion of the strip 100 located at the forward stamping station 005, causing the protrusion 110 to separate from the strip 100, and obtain an alloy part 200 with a first rounded corner 111 and a second rounded corner 112.

[0043] Specifically, the strip 100 is first fed from the first station 001 between the upper and lower dies, causing it to move intermittently to the second station 002 at a preset step distance. After each feeding stops, the upper die presses down relative to the lower die, allowing portions of the strip 100 at different stations to undergo corresponding processing simultaneously. After the upper die resets, the strip 100 moves again at the preset step distance, thus forming a continuous processing cycle. Based on this, by intermittently moving the strip 100 from the first station 001 to the second station 002, and sequentially passing through the stress groove processing station 003, the back stamping station 004, and the forward stamping station 005, stress release, rounded corner preforming, and product separation can be completed sequentially during continuous processing, improving the positional accuracy and production efficiency between each processing step. The stress relief groove 101 provides space for material deformation during subsequent stamping processes, reducing deformation caused by the transfer of stamping pressure to the surrounding strip 100. Back stamping causes the strip 100 to form a protrusion 110 with a first rounded corner 111, thus pre-forming the edge shape on one side of the alloy part 200. Forward stamping separates the protrusion 110 from the strip 100, forming a second rounded corner 112. Therefore, double-sided rounded corners can be obtained during the forming and separation of the alloy part 200, reducing burrs and edge collapse, improving the forming accuracy and consistency of the alloy part 200, and eliminating the need for subsequent independent grinding processes, thus reducing equipment and production space requirements.

[0044] Specifically, the stress groove machining position 003 includes a first groove machining position 0031 and a second groove machining position 0032 arranged sequentially along the moving direction; Step S2, machining stress relief groove 101 on the portion of the strip 100 located at stress groove machining position 003 includes: S21. Process a first stress groove 1011 on the portion of the material strip 100 located at the first groove processing position 0031. The first stress grooves 1011 are spaced on the material strip 100 along the moving direction and extend along a first direction perpendicular to the moving direction. S22. Process a second stress groove 1012 on the part of the material strip 100 located at the second groove processing position 0032. The second stress groove 1012 is located between the two first stress grooves 1011 and is located on one side of the protrusion 110 in the first direction.

[0045] By sequentially setting the first groove processing position 0031 and the second groove processing position 0032 along the moving direction, the stress relief groove 101 is formed in two processing steps, which can reduce the processing load at the same station and reduce the possibility of the material strip 100 shifting or undergoing local deformation when the grooves in multiple directions are processed simultaneously. The two first stress grooves 1011 extending along the first direction are respectively located on both sides of the protrusion 110 along the moving direction, and are used to cut off the path of the punching force transmitted to the surrounding material strip 100 along the moving direction; the second stress groove 1012 is located between the two first stress grooves 1011 and is set on one side of the protrusion 110 along the first direction, and is used to further cut off the path of the punching force transmitted along the first direction. Therefore, the first stress groove 1011 and the second stress groove 1012 are together arranged around the protrusion 110, forming a stress release area around the protrusion 110 that can undergo local deformation. This restricts the material flow and bulging deformation generated during the back stamping process mainly within this area, reducing the transmission of stamping pressure to adjacent forming positions and the main body of the strip 100. This reduces the possibility of displacement, warping, or dimensional changes caused by mutual pulling between adjacent protrusions 110, improving the forming accuracy and consistency of the protrusion 110 and the alloy part 200. At the same time, the side of the protrusion 110 without the second stress groove 1012 can still maintain connection with the strip 100 through continuous material, allowing the semi-finished product formed by back stamping to be stably transported to the forward stamping station 005 with the strip 100, preventing premature detachment or fall-off of the semi-finished product, and balancing stress release effect and continuous feeding stability.

[0046] Furthermore, in the first direction, the strip 100 is processed with a plurality of protrusions 110 at intervals, and the position of the strip 100 corresponding to the processed protrusions 110 is the forming position 006; the groove wall of the first stress groove 1011 extends into the first region, which is the region between any two adjacent forming positions 006 in the first direction. Step S21, machining the first stress groove 1011 on the portion of the strip 100 located at the first groove machining position 0031 includes: The material strip 100 is subjected to pressure twice by the preset first groove cutting tool 300, so that the material strip 100 forms the first stress groove 1011 on both sides of the forming position 006 along the upward movement direction.

[0047] By applying pressure twice to the strip 100 using the first grooving cutter 300, first stress grooves 1011 are formed on both sides of the same forming position 006 along the moving direction. This allows the same first grooving cutter 300 to complete the processing of the grooves on both sides of the forming position 006, reducing the number of grooving cutters and their installation space in the continuous die, and avoiding the concentration of instantaneous punching load caused by processing two first stress grooves 1011 simultaneously. After the two first stress grooves 1011 are formed, they can respectively block the punching pressure generated by subsequent back punching from being transmitted to both sides of the forming position 006 along the moving direction of the strip 100, giving the material near the forming position 006 a relatively independent deformation space. This reduces the pulling and interference of material flow on adjacent forming positions 006, thereby reducing the possibility of the strip 100 shifting, warping, and local dimensional changes, and improving the forming accuracy of the protrusion 110 and the consistency of continuous processing.

[0048] Based on the above embodiment, the minimum distance between any two adjacent forming positions 006 in the first direction is the first distance D1. The groove wall of the first stress groove 1011 extends towards the first region, making the distance between the first stress groove 1011 and the forming position 006 a second distance D2, which is smaller than the first distance D1. The second stress groove 1012 extends along the moving direction, and its distance from the forming position 006 is also the second distance D2. Specifically, the first spacing D1 is obtained through the second spacing D2, including: S001. Provide a test strip with the same material and thickness as the strip 100, set a test forming position on the test strip, and make the distance between the test stress groove processed around the test forming position and the test forming position a second distance D2. The so-called test forming position refers to an area whose shape, size and stamping conditions are the same as or equivalent to the actual forming position 006, but is used to obtain material deformation data; the so-called test stress groove refers to a groove-shaped structure whose groove shape and processing method are the same as or equivalent to the stress relief groove 101.

[0049] S002. Along the first direction, multiple strain measurement positions are determined at intervals between the edge of the test molding position and the test stress groove, and the distance between each strain measurement position and the edge of the test molding position is denoted as x. The location for strain measurement can be determined by etching a square grid, a circular grid, or laser marking on the surface of the test strip, or by recording surface images before and after stamping using digital image correlation measurement equipment. When using grid measurement, the equivalent plastic strain ε at the corresponding location can be calculated based on the changes in the length, width, and shape of the grid before and after stamping. x When using digital image correlation measurement, the strain distribution along the first direction can be directly obtained by the image processing system.

[0050] S003. Perform reverse stamping and forward stamping on the test forming position in sequence, obtain the dimensional changes of each strain measurement position before and after stamping, and obtain the equivalent plastic strain ε corresponding to each strain measurement position based on the dimensional changes. x ; Equivalent plastic strain is a parameter used to comprehensively characterize the degree of irreversible plastic deformation of a material in different directions. A larger value indicates more significant plastic deformation at the corresponding location. Generally, as the distance x between the strain measurement location and the edge of the test molding site increases, the influence of the molding action on the test strip gradually weakens, and the equivalent plastic strain ε increases. x The corresponding decrease; regarding the equivalent plastic strain ε x The calculation method is well known to those skilled in the art, and will not be elaborated in detail in this embodiment.

[0051] S004. Obtain the allowable equivalent plastic strain ε of the test strip. a Within the range greater than 0 and less than the second spacing D2, it is determined that 2ε is satisfied. x ≤ ε a The minimum distance x0; The first spacing D1 is determined according to the following formula: D1 = 2x0; The positions of two adjacent forming positions 006 in the first direction are determined according to the first spacing D1, such that the middle position between the two adjacent forming positions 006 is separated from the edge of the two forming positions 006 by a distance x0.

[0052] Allowable equivalent plastic strain ε of the test strip a The allowable equivalent plastic strain ε can be determined based on the fracture strain obtained from material tensile tests, the allowable thinning rate, and a preset safety factor, or it can be determined based on existing stamping data for the same material. a It refers to the upper limit of the equivalent plastic strain that a material is allowed to withstand without unacceptable tearing, excessive thinning, or permanent warping.

[0053] That is, within the range greater than 0 and less than the second spacing D2, it is determined that 2ε is satisfied. x ≤ε a The minimum distance x0 is determined, and the first spacing D1 is determined according to D1 = 2x0.

[0054] In the above calculation, the midpoint between two adjacent forming positions 006 in the first direction is x0 away from the edges of the two forming positions 006. Since the two forming positions 006 can receive the same reverse or forward stamping in the same stamping stroke, the midpoint is affected by both forming positions 006. The conservative superimposed strain at this position is represented by 2εx0. Let 2εx0 not exceed the allowable equivalent plastic strain ε. aThis can keep the superimposed strain generated after the two deformation-affected regions overlap within the allowable range of the material.

[0055] From D1 = 2x0 and 0 < x0 < D2, it can be seen that the first spacing D1 is less than twice the second spacing D2. The overlap width of the two deformation-affected regions can be expressed as 2D2 - D1. The strain attenuation laws corresponding to different alloy materials, different strip thicknesses 100, or different protrusion heights 110 may be different. By obtaining x0 through testing and determining D1 accordingly, the spacing between samples can be adjusted according to the actual material properties and forming conditions, without having to use a fixed empirical multiple. Thus, it is possible to reduce the material consumption of strip 100 in the first direction and reduce the risk of excessive strain in the first region.

[0056] After determining the first spacing D1 and the second spacing D2, the first stress groove 1011 and the second stress groove 1012 are machined according to their corresponding positions. The stress relief groove 101 creates a partial disconnect between the material frame around the forming position 006 and the remaining material strips 100. When subsequent back stamping and forward stamping transmit extrusion pressure to the material frame, the material frame can undergo plastic deformation towards the space provided by the stress relief groove 101, reducing the continued transmission of stamping pressure to the outer material strips 100. The first stress groove 1011 and the second stress groove 1012 maintain the second spacing D2 with the forming position 006 in different directions, which is beneficial for the material frame to expand more uniformly around the forming position 006.

[0057] Furthermore, a guide hole station 007 is provided between the first station 001 and the stress groove machining station 003; Step S2, before machining the stress relief groove 101 in the portion of the strip 100 located at the stress groove machining position 003, also includes: S110, A guide channel 120 is opened for the part of the material strip 100 located at the guide hole station 007; The process includes machining a stress relief groove 101 on the portion of the strip 100 located at the stress groove machining position 003, performing back stamping on the portion of the strip 100 located at the back stamping position 004, and performing forward stamping on the portion of the strip 100 located at the forward stamping position 005. Insert the guide pin into the guide channel 120 to position the material strip 100.

[0058] Furthermore, a cutting station 008 is provided between the stamping station 005 and the second station 002; After performing positive stamping on the portion of the strip 100 located at the positive stamping station 005 in step S4, the process also includes: The portion of the material strip 100 located at the cutting station 008 is cut off from the material strip 100.

[0059] To facilitate understanding by those skilled in the art, the preferred implementation method of this embodiment will be described below: like Figure 6 As shown, the strip 100 has two forming positions 006 along the first direction. The minimum distance between any two adjacent forming positions 006 is the first distance D1. The minimum distance between the first stress groove 1011 and the corresponding forming position 006, and the minimum distance between the second stress groove 1012 and the corresponding forming position 006 are the second distance D2. The first distance D1 is used to indicate the tightness of the arrangement of two adjacent forming positions 006, and the second distance D2 is used to indicate the width of the material frame around the forming position 006 that can participate in the stamping deformation.

[0060] In this embodiment, the first spacing D1 is less than twice the second spacing D2, i.e., D1 < 2D2, indicating that the material deformation influence areas corresponding to the two adjacent forming positions 006 partially overlap in the first region. By allowing partial overlap of the deformation influence areas, the spacing between adjacent forming positions 006 can be reduced while ensuring sufficient deformation space for the material, thereby improving the material utilization rate of the strip 100. However, if the first spacing D1 is too small, the plastic strain generated by the two adjacent forming positions 006 during the back stamping and forward stamping processes will be excessively superimposed in the first region, which can easily lead to local thinning, tearing, or warping. Therefore, the first spacing D1 can be obtained in the following way.

[0061] Specifically, a test strip with the same material and thickness as the strip to be processed 100 is provided. A test forming position is set on the test strip, and a test stress groove is machined around the test forming position, such that the distance between the test stress groove and the test forming position is equal to the second distance D2. Along the first direction, multiple strain measurement positions are set at intervals between the edge of the test forming position and the test stress groove, and the distance between each strain measurement position and the edge of the test forming position is denoted as x.

[0062] The test forming positions were subjected to the same back stamping and forward stamping as in actual production. The dimensional changes at each strain measurement location before and after stamping were obtained, and the equivalent plastic strain ε at each location was calculated. x The allowable equivalent plastic strain ε of the test strip. a The allowable equivalent plastic strain ε can be determined based on the fracture strain obtained from material tensile tests, the allowable thinning rate, and a preset safety factor, or it can be determined based on existing stamping data for the same material. a This refers to the upper limit of the equivalent plastic strain that a material is allowed to withstand without unacceptable tearing, excessive thinning, or permanent warping. Within the range greater than 0 and less than the second spacing D2, 2ε is determined to be satisfied. x ≤ε a The minimum distance x0 is determined, and the first spacing D1 is determined according to D1 = 2x0.

[0063] After determining the first spacing D1 and the second spacing D2, the spacing between the guide tool 700, the first grooving tool 300, the second grooving tool 400, the back punch 510, the forward punch 600 and the cutting tool 800, as well as the spacing of the forward punch 600 in the first direction, can be determined using the above parameters.

[0064] After completing the above preparations, processing of the strip 100 begins. The strip 100 is fed from the first station 001 between the upper and lower molds, causing it to move intermittently to the second station 002 according to a preset step distance. After each feeding stops, the upper mold presses down relative to the lower mold, causing portions of the strip 100 at different stations to receive corresponding processing simultaneously. After the upper mold resets, the strip 100 moves again by the preset step distance, thus forming a continuous processing cycle.

[0065] The strip 100 first passes through the hole guide station 007, where the guide cutter 700 punches and forms the guide channel 120 on the strip 100. In subsequent processing, the guide pin is inserted into the guide channel 120, so that the forming position 006 to be processed is aligned with the first grooving cutter 300, the second grooving cutter 400, the back punch 510, and the forward punch 600, respectively.

[0066] After the strip 100 moves to the first groove processing position 0031, the first groove cutting tool 300 applies a first pressure to the strip 100, forming a first stress groove 1011 on one side of the forming position 006 along the moving direction. After the strip 100 continues to move a preset step distance, the first groove cutting tool 300 applies a second pressure to the strip 100, forming another first stress groove 1011 on the other side of the same forming position 006 along the moving direction. Subsequently, the strip 100 enters the second groove processing position 0032, where the second groove cutting tool 400 processes a second stress groove 1012 extending along the moving direction.

[0067] After the stress relief groove 101 is processed, the strip 100 moves to the back-pressing station 004. The back-pressing top post 510 and the back-pressing bottom post 520 jointly press the forming position 006, so that the forming position 006 forms a protrusion 110 relative to the reference plane of the strip 100, and a first rounded corner 111 is formed on one side of the protrusion 110 by using the back-pressing forming arc.

[0068] After the back stamping is completed, the protrusion 110 remains connected to the strip 100 through the uncut material and moves with the strip 100 to the forward stamping station 005. The forward stamping cutter 600 presses the protrusion 110 in the opposite direction to the back stamping action, forcing the edge material of the protrusion 110 into the corresponding forming contour, forming a second rounded corner 112 during the extrusion and punching process, and finally separating the protrusion 110 from the strip 100 to become the alloy part 200.

[0069] After the alloy part 200 is separated, the remaining strip 100 moves to the cutting station 008, where the cutting tool 800 cuts off the waste strip and discharges it from the second station 002.

[0070] Example 3: Please see Figure 7 This embodiment provides a double-sided rounded corner alloy part 200 obtained by the molding apparatus described in Embodiment 1 or the molding method described in Embodiment 2. The alloy part 200 can be a circular sheet structure, including a first surface and a second surface disposed opposite to each other, and a peripheral surface connecting the first surface and the second surface. A first rounded corner 111 is formed between the first surface and the peripheral surface, and a second rounded corner 112 is formed between the second surface and the peripheral surface, thereby giving both sides of the alloy part 200 a smooth transition edge in the thickness direction.

[0071] In other embodiments, the alloy part 200 can also be an elliptical, rectangular, annular, or irregularly shaped sheet structure with a snap-fit ​​portion, as long as the contours of the punch top post 510, punch bottom post 520, punch cutter 600, and stress relief groove 101 are adapted to the target contour of the alloy part 200. The radii of the first fillet 111 and the second fillet 112 can be the same, or they can be set to different values ​​according to the assembly requirements on both sides of the alloy part 200.

[0072] Alloy part 200 can be used as a magnetic strip for graphics card mounting, a shielding sheet for electronic devices, a precision positioning pad, or other alloy sheet parts requiring smooth edges on both sides. The first rounded corner 111 and the second rounded corner 112 reduce scratches on adjacent structures during assembly of alloy part 200 and minimize the impact of sharp burrs on assembly clearances and positioning accuracy. Since both rounded corners are formed in a continuous stamping die, differences in rounded corner dimensions caused by manual grinding are reduced, and the dimensional consistency of batch alloy parts 200 is improved.

[0073] In summary, this application, through the sequential coordination of stress relief groove 101, back stamping, and forward stamping, ensures that the first fillet 111 and the second fillet 112 of the alloy part 200 are formed during the controlled extrusion process before and after product separation; the guide channel 120 and guide pins ensure the positioning of each station; and the first spacing D1 and the second spacing D2 control the arrangement of adjacent forming positions 006 and the area affected by material deformation. These technical features work together to balance the utilization rate of the strip 100, the accuracy of fillet forming, and the stability of feeding during continuous processing.

[0074] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0075] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0076] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for forming a double-sided rounded corner alloy part, characterized in that, include: A material strip is provided, which is then intermittently moved from the first station to the second station; between the first station and the second station, there are sequentially arranged a stress groove processing station, a back stamping station, and a forward stamping station; Stress relief grooves are machined on the portion of the strip located at the stress groove machining position; The portion of the strip located at the back-pressing station is back-pressed, causing the strip to be pressed to form a protrusion with a first rounded corner; The portion of the strip located at the positive stamping station is positively stamped to separate the protrusion from the strip, resulting in an alloy part with a first rounded corner and a second rounded corner.

2. The forming method of a double-sided rounded corner alloy part according to claim 1, characterized in that, The stress groove machining position includes a first groove machining position and a second groove machining position arranged sequentially along the moving direction. The portion of the stress relief groove located at the stress groove machining position of the material strip includes: A first stress groove is processed on the portion of the material strip located at the first groove processing position. The first stress groove is spaced on the material strip along the moving direction and extends along a first direction perpendicular to the moving direction. A second stress groove is machined on the portion of the material strip located at the second groove processing position. The second stress groove is located between the two first stress grooves and is located on one side of the protrusion in the first direction.

3. The forming method of a double-sided rounded corner alloy part according to claim 2, characterized in that, In a first direction, the strip is processed with a plurality of protrusions at intervals, and the position of the strip corresponding to the processing of the protrusions is a forming position; the groove wall of the first stress groove extends into a first region, which is the region between any two adjacent forming positions in the first direction; The process of machining the first stress groove on the portion of the material strip located at the first groove machining position includes: The material strip is subjected to pressure twice by a pre-set first groove cutting tool, so that the material strip forms the first stress groove on both sides of the moving upward direction at the forming position.

4. The forming method of a double-sided rounded corner alloy part according to claim 3, characterized in that, The minimum distance between any two adjacent forming positions in the first direction is the first distance. The groove wall of the first stress groove extends into the first region, and the distance between the first stress groove and the forming position is the second distance, which is smaller than the first distance.

5. The forming method of a double-sided rounded corner alloy part according to claim 4, characterized in that, The first spacing is obtained through the second spacing, including: A test strip with the same material and thickness as the strip is provided. A test forming position is set on the test strip, and the distance between the test stress groove processed around the test forming position and the test forming position is the second distance. Along a first direction, a plurality of strain measurement positions are determined at intervals between the edge of the test molding position and the test stress groove, and the distance between each strain measurement position and the edge of the test molding position is denoted as x; The test forming position is subjected to the back stamping and the forward stamping in sequence. The dimensional changes of each strain measurement position before and after stamping are obtained, and the equivalent plastic strain ε corresponding to each strain measurement position is obtained based on the dimensional changes. x ; Obtain the allowable equivalent plastic strain ε of the test strip. a Within the range greater than 0 and less than the second spacing, it is determined that 2ε is satisfied. x ≤ ε a The minimum distance x0; The first spacing D1 is determined according to the following formula: D1 = 2x0; The positions of two adjacent forming positions in the first direction are determined according to the first spacing D1, such that the middle position between the two adjacent forming positions is respectively separated from the edge spacing x0 of the two forming positions.

6. The forming method of a double-sided rounded corner alloy part according to claim 4, characterized in that, The second stress groove extends along the moving direction and is spaced apart from the forming position by a second spacing.

7. The forming method of a double-sided rounded corner alloy part according to claim 2, characterized in that, A guide hole station is provided between the first station and the stress groove processing station; The process of machining the stress relief groove before the stress relief groove at the stress groove machining position of the material strip also includes: A guide channel is opened for the portion of the material strip located at the guide hole station; The process of machining stress relief grooves on the portion of the strip located at the stress groove machining position, the process of back-pressing the portion of the strip located at the back-pressing station, and the process of forward-pressing the portion of the strip located at the forward-pressing station all include: Insert the guide pin into the guide channel to position the material strip.

8. The forming method of a double-sided rounded corner alloy part according to claim 2, characterized in that, A cutting station is provided between the positive stamping station and the second station; After the portion of the strip located at the positive stamping station is positively stamped, the process further includes: The portion of the material strip located at the cutting station is cut off from the material strip.

9. A forming apparatus for a double-sided rounded corner alloy part, characterized in that, The molding method described in any one of claims 1-8 includes a lower mold and an upper mold. The upper mold can press down relative to the lower mold. The upper mold is sequentially equipped with a first groove cutter, a second groove cutter, a back punch, and a forward punch along the moving direction of the material strip. The lower mold is provided with a back punch bottom post corresponding to the position of the first back punch.

10. A double-sided rounded corner alloy part, characterized in that, Obtained by the molding method according to any one of claims 1-8, including an alloy part, wherein both opposite sides of the alloy part have rounded corners.

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