Precise stamping method for arc size of metal shell

Abstract

The invention discloses a precise stamping method for the arc size of a metal shell, and the method is based on a stamping assembly, and the metal shell comprises a body, linear flanging parts which are bent downwards from the edges of four sides of the body, and corner flanging parts which are bent downwards from four corners of the body, the stamping assembly further comprises a lower base plate and a lower supporting plate installed on the upper surface of the lower base plate, and the outer sides of the four side surfaces of the lower supporting plate are each movably provided with a linear forming male die corresponding to the linear flanging part on the shell. L-shaped forming male dies corresponding to corner flanging parts on the shell are movably arranged on the outer sides of the four corners of the lower supporting plate and located between any two adjacent linear forming male dies. According to the stamping die, the flanging part of the shell is convenient to install, synchronous stamping forming of the flanging part in the whole circumferential direction of the shell is achieved, efficiency is improved, balance, stability and consistency of stamping force are improved, and machining quality is improved.

Description

Technical Field

[0001] The invention relates to a method for accurately stamping arc-shaped dimensions of a metal shell, and belongs to the field of electronic product processing. Background Art

[0002] The processing of stamping parts often requires multiple stamping processes to complete. According to the shape, size, raw materials and other factors of the stamping parts, it can be roughly divided into separation process and forming process. Among them, the forming process is the process of obtaining parts with certain shape, size and precision requirements by plastic deformation of the material without breaking. Bending, stretching, flanging, bulging, shaping, etc. all use forming processes.

[0003] In the prior art, when stamping multiple flanges of a stamped part, one flange is usually stamped in turn, which is inefficient and the force of each stamping is different, which easily affects the processing quality. Summary of the invention

[0004] The purpose of the present invention is to provide a method for precision stamping of arc-shaped dimensions of a metal shell, which is convenient for the installation of the flanged portion of the shell and realizes the synchronous stamping forming of the flanged portion of the shell in the entire circumference, thereby improving the efficiency and the balance, stability and consistency of the stamping force, thereby improving the processing quality.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a method for precision stamping of arc-shaped dimensions of a metal shell, based on a stamping assembly, the metal shell comprising: a body, a straight flange portion bent downward from the edges of the four sides of the body, and a corner flange portion bent downward from the four corners of the body, the stamping assembly further comprising: a lower base plate and a lower support plate installed on the upper surface of the lower base plate, the outer sides of the four side surfaces of the lower support plate are each movably provided with a straight line forming convex die corresponding to the straight line flange portion on the shell, and the outer side of each of the straight line forming convex dies A linear forming die is correspondingly provided, and an L-shaped forming convex die corresponding to the corner flange portion on the shell can be movably provided on the outer side of the four corners of the lower support plate and between any two adjacent linear forming convex dies. An L-shaped forming die is correspondingly provided on the outer side of each L-shaped forming convex die, and the forming dies are fixedly mounted on the lower base plate. Each of the forming convex dies is movably mounted on the lower base plate through at least one slide rail, so that they can each approach the corresponding forming die to form an arc-shaped outer convex surface on the flange portion of the shell; The upper surface of the lower base plate is provided with a plurality of through holes, and the upper ends of a plurality of insert knives that can move in the vertical direction pass through the through holes accordingly, and the upper end of each of the insert knives facing the side surface of the linear forming convex mold has a first inclined surface, and the lower end of each of the side surfaces of the linear forming convex mold facing the lower support plate has a second inclined surface corresponding to the first inclined surface, and the second inclined surface is in sliding contact with the first inclined surface located below it, and the lower parts of the first inclined surface and the second inclined surface extend in a direction away from the lower support plate, and at least one spring in a compressed state is installed between each forming convex mold and the corresponding forming concave mold, and an inclined surface area is formed on the end surface of the L-shaped forming convex mold facing the corner of the lower support plate, and both ends of each of the linear forming convex molds have a driving inclined surface area in sliding contact with the inclined surface area; The stamping method comprises the following steps: Step 1: Place the metal shell on the lower support plate so that the lower surface of the body contacts the upper surface of the lower support plate, and the flange portion is embedded in the gap formed between the forming convex die and the corresponding forming concave die under the action of the spring; Step 2, driving the inserting knife to move upward, during which the first inclined surface of the inserting knife slidingly cooperates with the second inclined surface of the linear forming punch to push the linear forming punch to move horizontally along the slide rail to the outside away from the lower support plate; At the same time, the driving inclined surface areas on any two linear forming convex dies that move outward horizontally push the inclined surface area on the L-shaped forming convex dies between them, so that each L-shaped forming convex dies presses the corner flange part embedded therein along its corresponding slide rail toward the corresponding L-shaped forming concave die to form the required arc-shaped outer convex surface, until the driving inclined surface area of ​​the linear forming convex dies slides out of the inclined surface area on the L-shaped forming convex dies; Step 3: Continue to drive the insert knife upward so that the linear forming punch continues to move outward, while the L-shaped forming punch is no longer moved under force. The linear forming punch squeezes the linear flanging portion embedded therein along the slide rail toward the corresponding linear forming die to form the required arc-shaped outer convex surface.

[0006] The further improved scheme in the above technical scheme is as follows: 1. In the above scheme, the angle formed between the moving direction of each movable L-shaped forming punch and the moving direction of the adjacent straight line forming punch is 45°.

[0007] 2. In the above scheme, the two end faces of the L-shaped forming punch are respectively parallel to the end face of one end of an adjacent straight forming punch, and a notch groove is provided on the end faces at both ends of each of the L-shaped forming punches, one inner side surface of the notch groove is formed as the driving bevel area, and the other inner side surface is parallel to its own end face and can slide in contact with the end face of the L-shaped forming punch.

[0008] 3. In the above solution, each forming convex die and / or each forming concave die is provided with a groove for embedding one end of the spring.

[0009] 4. In the above scheme, the lower end of each of the inserts passes through the through hole on the lower base plate and is connected to the same movable plate arranged directly below the lower base plate, and the lower surface of the movable plate movable in the vertical direction is connected to the piston rod of at least one cylinder.

[0010] 5. In the above solution, a bottom plate is fixedly mounted on the lower surface of the lower base plate, and a movable groove is provided on the upper surface of the bottom plate for the movable plate to be embedded in.

[0011] 6. In the above solution, a bottom base plate is spaced apart below the bottom plate, and the cylinder is fixedly mounted on the upper surface of the bottom base plate.

[0012] 7. In the above solution, the upper surface of the base substrate and the lower surface of the bottom plate are connected by a plurality of support bars.

[0013] 8. In the above solution, the lower support plate is provided with a plurality of avoidance through holes for the upper end of the inserting blade to be embedded.

[0014] 9. In the above scheme, the inserting blade, the through hole on the lower base plate and the avoidance through hole on the lower support plate are all provided with 6.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The arc-shaped precision stamping method of a metal shell of the present invention comprises the following steps: step 1, placing the metal shell on the lower support plate so that the lower surface of the body thereof contacts the upper surface of the lower support plate, and the flange portion thereof is embedded in the gap formed between the forming convex die and the corresponding forming concave die under the action of the spring; step 2, driving the insert knife to move upward, during which the first inclined surface of the insert knife that slides with the second inclined surface on the linear forming convex die pushes the linear forming convex die to move horizontally along the slide rail toward the outer side away from the lower support plate, and at the same time, the driving inclined surface areas on any two linear forming convex dies that move horizontally outward push the inclined surface areas on the L-shaped forming convex die between them, so that each L-shaped forming convex die extrude the corner flange portion embedded therein along its corresponding slide rail toward the corresponding L-shaped forming concave die to form the required The arc-shaped outer convex surface is formed until the driving inclined surface area of ​​the linear forming punch slides out of the inclined surface area on the L-shaped forming punch. Step three, continue to drive the insert knife upward to make the linear forming punch continue to move outward, and the L-shaped forming punch is no longer moved under force. The linear forming punch extrude the linear flanging part embedded therein along the slide rail toward the corresponding linear forming die to form the required arc-shaped outer convex surface, which is convenient for installing the flanging part of the shell between the forming punch and the forming die, and can also drive the linear forming punches in four directions and the L-shaped forming punches at the four corners to move and extrude synchronously toward the corresponding forming die through the one-time upward movement of the insert knife, thereby realizing the synchronous stamping forming of the flanging part of the shell on the entire circumference of the shell to obtain the required arc-shaped outer convex surface, which not only improves the efficiency, but also improves the balance, stability and consistency of the punching force, thereby improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a structural schematic diagram of the arc-shaped precision stamping method of a metal shell of the present invention; Attached Figure 2 For attachment Figure 1 Schematic diagram of the cross section along AA; Attached Figure 3 For attachment Figure 2 The enlarged schematic diagram of point B in the middle; Attached Figure 4 It is a partial structural schematic diagram of the arc-shaped precision stamping method of a metal shell of the present invention; Attached Figure 5 For attachment Figure 4 The enlarged schematic diagram of the center C; Attached Figure 6 It is a schematic diagram of the partial structure disassembly of the arc-shaped precision stamping method of the metal shell of the present invention; Attached Figure 7 It is a schematic diagram of the structure of the shell of the arc-shaped precision stamping method of the metal shell of the present invention.

[0017] In the above drawings: 100, shell; 101, body; 102, straight flange portion; 103, corner flange portion; 1, lower base plate; 2, lower support plate; 31, straight line forming punch; 32, L-shaped forming punch; 41, straight line forming die; 42, L-shaped forming die; 5, through hole; 6, insert knife; 71, first inclined surface; 72, second inclined surface; 8, spring; 9 slide rail; 10, movable plate; 11, cylinder; 12, bottom plate; 121, movable groove; 13, bottom base plate; 14, support bar; 15, avoidance through hole; 18, inclined surface area; 19, driving inclined surface area; 191, notch groove; 20, groove. Implementation

[0018] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0019] Embodiment 1: A method for precision stamping of an arc-shaped metal shell, based on a stamping assembly, wherein the metal shell 100 comprises: a body 101, a straight flange portion 102 bent downward from the edges of the 4 sides of the body 101, and a corner flange portion 103 bent downward from the 4 corners of the body 101, and the stamping assembly further comprises: a lower base plate 1 and a lower support plate 2 mounted on the upper surface of the lower base plate 1, wherein the outer sides of the four side surfaces of the lower support plate 2 are each movably provided with a straight forming convex die 31 corresponding to the straight flange portion 102 on the shell 100, and the outer sides of each of the straight forming convex dies 31 correspond to A linear forming die 41 is provided, and an L-shaped forming die 32 corresponding to the corner flange portion 103 on the shell 100 can be movably provided on the outer side of the four corners of the lower support plate 2 and between any two adjacent linear forming convex dies 31, and an L-shaped forming die 42 is correspondingly provided on the outer side of each L-shaped forming convex die 32, and the forming dies are fixedly installed on the lower base plate 1, and each of the forming convex dies is movably installed on the lower base plate 1 through at least one slide rail 9, so that they can each approach the corresponding forming die to form an arc-shaped outer convex surface on the flange portion of the shell 100; The shell to be punched is mounted on the lower support plate, so that the lower surface of the upper body of the shell fits with the lower support plate and the upper surface of the forming punch, and the flange portion on the shell is embedded in the gap formed by the forming punch and the corresponding forming die under the action of the spring; The upper surface of the lower base plate 1 is provided with a plurality of through holes 5, and the upper ends of a plurality of insert knives 6 that can move in the vertical direction pass through the through holes 5 accordingly. The upper end of each insert knives 6 facing the side surface of the linear forming punch 3 has a first inclined surface 71, and the lower end of each side surface of the linear forming punch 3 facing the lower support plate 2 has a second inclined surface 72 corresponding to the first inclined surface 71, and the second inclined surface 72 is in sliding contact with the first inclined surface 71 located below it, and the lower parts of the first inclined surface 71 and the second inclined surface 72 extend in the direction away from the lower support plate 2. At least one spring 8 in a compressed state is installed between each forming punch and the corresponding forming die. A bevel area 18 is formed on the end surface of the L-shaped forming punch 32 facing the corner of the lower support plate 2, and both ends of each linear forming punch 31 have a driving bevel area 19 in sliding contact with the bevel area 18. The stamping method comprises the following steps: Step 1: Place the metal shell 100 on the lower support plate 2 so that the lower surface of its body 101 contacts the upper surface of the lower support plate 2, and the flange portion thereof is embedded in the gap formed between the forming convex die and the corresponding forming concave die under the action of the spring 8; Step 2: drive the inserting knife 6 to move upward. During this process, the first inclined surface 71 on the inserting knife 6 that is slidably matched with the second inclined surface 72 on the linear forming punch 31 pushes the linear forming punch 31 to move horizontally along the slide rail 9 to the outside away from the lower support plate 2; At the same time, the driving inclined surface areas 19 on any two linear forming convex dies 31 moving horizontally outward push the inclined surface area 18 on the L-shaped forming convex dies 32 located between them, so that each L-shaped forming convex dies 32 squeezes the corner flange portion 103 embedded therein along its corresponding slide rail 9 toward the corresponding L-shaped forming concave die 42 to form the required arc-shaped outer convex surface, until the driving inclined surface area 19 of the linear forming convex dies 31 slides out of the inclined surface area 18 on the L-shaped forming convex dies 32; The cylinder drives the movable plate to move up, and then the movable plate drives multiple inserting knives to move up synchronously with the same stroke. During this process, the first inclined surface of the inserting knife slidingly matched with the second inclined surface on the linear forming punch simultaneously pushes the linear forming punches in four directions upward, and the linear forming punch limited by the slide rail cannot move up, so it can only move horizontally along the slide rail to the outside away from the lower support plate, and the driving inclined surface areas on any two linear forming punches moving outward further push the inclined surface areas on the L-shaped forming punch between them, so that each L-shaped forming punch is synchronously moved outward along its corresponding slide rail toward the direction of the corresponding forming die to extrude the flange portion embedded therein, and the L-shaped forming punch stamps the required arc-shaped outer convex surface on the flange portion of the shell before the linear forming punch. During this process, the driving inclined surface area on the linear forming punch slides relative to the inclined surface area on the L-shaped forming punch until the driving inclined surface area slides out of the inclined surface area; Step 3: Continue to drive the inserting knife 6 upward so that the linear forming punch 31 continues to move outward, while the L-shaped forming punch 32 is no longer moved under force, and the linear forming punch 31 squeezes the linear flange portion 102 embedded therein along the slide rail 9 toward the corresponding linear forming die 41 to form the required arc-shaped outer convex surface; When the driving bevel area slides out of the bevel area, the linear forming punch continues to move outward, and the L-shaped forming punch is no longer moved under force, and the linear forming punch continues to squeeze the flange part embedded therein toward the corresponding forming die, so that the four linear forming punches synchronously realize the stamping of the flange part of the shell to form the required arc-shaped outer convex surface.

[0020] The included angle between the moving direction of each movable L-shaped forming punch 32 and the moving direction of the adjacent linear forming punch 31 is 45°.

[0021] The two end faces of the above-mentioned L-shaped forming punch 32 are respectively parallel to the end face of one end of an adjacent straight forming punch 31. A notch groove 191 is provided on the end faces at both ends of each of the L-shaped forming punches 32. One inner side surface of the notch groove 191 forms the driving bevel area 19, and the other inner side surface is parallel to its own end face and can be in sliding contact with the end face of the L-shaped forming punch 32.

[0022] Each of the above-mentioned forming convex dies is provided with a groove 20 for one end of the spring 8 to be embedded.

[0023] The lower end of each of the above-mentioned inserts 6 passes through the through hole 5 on the lower base plate 1 and is connected to the same movable plate 10 arranged directly below the lower base plate 1. The lower surface of the movable plate 10 that can move in the vertical direction is connected to the piston rod of at least one cylinder 11.

[0024] A bottom plate 12 is fixedly mounted on the lower surface of the lower base plate 1 , and a movable groove 121 is provided on the upper surface of the bottom plate 12 for the movable plate 10 to be inserted into.

[0025] A bottom base plate 13 is disposed below the bottom plate 12 , and the cylinder 11 is fixedly mounted on the upper surface of the bottom base plate 13 .

[0026] The upper surface of the bottom substrate 13 and the lower surface of the bottom plate 12 are connected via a plurality of support bars 14 .

[0027] The lower support plate 2 is provided with a plurality of avoidance through holes 15 for the upper end of the inserting blade 6 to be inserted.

[0028] The inserting blades 6, the through holes 5 on the lower base plate 1 and the avoidance through holes 15 on the lower support plate 2 are all provided in six numbers.

[0029] Embodiment 2: A method for precision stamping of arc-shaped dimensions of a metal shell, based on a stamping assembly, wherein the metal shell 100 comprises: a body 101, a straight flange portion 102 bent downward from the edges of the 4 sides of the body 101, and a corner flange portion 103 bent downward from the 4 corners of the body 101, and the stamping assembly further comprises: a lower base plate 1 and a lower support plate 2 mounted on the upper surface of the lower base plate 1, wherein the outer sides of the four side surfaces of the lower support plate 2 are each movably provided with a straight forming convex die 31 corresponding to the straight flange portion 102 on the shell 100, and the outer sides of each of the straight forming convex dies 31 correspond to A linear forming die 41 is provided, and an L-shaped forming die 32 corresponding to the corner flange portion 103 on the shell 100 can be movably provided on the outer side of the four corners of the lower support plate 2 and between any two adjacent linear forming convex dies 31, and an L-shaped forming die 42 is correspondingly provided on the outer side of each L-shaped forming convex die 32, and the forming dies are fixedly installed on the lower base plate 1, and each of the forming convex dies is movably installed on the lower base plate 1 through at least one slide rail 9, so that they can each approach the corresponding forming die to form an arc-shaped outer convex surface on the flange portion of the shell 100; The upper surface of the lower base plate 1 is provided with a plurality of through holes 5, and the upper ends of a plurality of insert knives 6 that can move in the vertical direction pass through the through holes 5 accordingly. The upper end of each insert knives 6 facing the side surface of the linear forming punch 3 has a first inclined surface 71, and the lower end of each side surface of the linear forming punch 3 facing the lower support plate 2 has a second inclined surface 72 corresponding to the first inclined surface 71, and the second inclined surface 72 is in sliding contact with the first inclined surface 71 located below it, and the lower parts of the first inclined surface 71 and the second inclined surface 72 extend in the direction away from the lower support plate 2. At least one spring 8 in a compressed state is installed between each forming punch and the corresponding forming die. A bevel area 18 is formed on the end surface of the L-shaped forming punch 32 facing the corner of the lower support plate 2, and both ends of each linear forming punch 31 have a driving bevel area 19 in sliding contact with the bevel area 18. In the initial state, the plunger that can move up and down driven by the cylinder is at the lowest end of its stroke. At this time, the forming convex molds in the four directions and at the four corners form a certain gap with the corresponding forming concave molds under the action of the springs, and the second inclined surface on each linear forming convex mold always keeps a close fit with the first inclined surface on the corresponding plunger, and the inclined surface area on each L-shaped forming convex mold is closely fitted with the driving inclined surface area on the corresponding linear forming convex mold; After one stamping is completed, the cylinder drives the inserting knife to move down and reset, and each forming punch is also reset under the action of the spring to keep the second inclined surface on each linear forming punch always in close contact with the first inclined surface on the corresponding inserting knife, and the inclined surface area on each L-shaped forming punch is kept in close contact with the driving inclined surface area on the linear forming punch, and a gap is formed between the forming punch and the corresponding forming die for the flange part on the shell to be embedded; The stamping method comprises the following steps: Step 1: Place the metal shell 100 on the lower support plate 2 so that the lower surface of its body 101 contacts the upper surface of the lower support plate 2, and the flange portion thereof is embedded in the gap formed between the forming convex die and the corresponding forming concave die under the action of the spring 8; Step 2: drive the inserting knife 6 to move upward. During this process, the first inclined surface 71 on the inserting knife 6 that is slidably matched with the second inclined surface 72 on the linear forming punch 31 pushes the linear forming punch 31 to move horizontally along the slide rail 9 to the outside away from the lower support plate 2; At the same time, the driving inclined surface areas 19 on any two linear forming convex dies 31 moving horizontally outward push the inclined surface area 18 on the L-shaped forming convex dies 32 located between them, so that each L-shaped forming convex dies 32 squeezes the corner flange portion 103 embedded therein along its corresponding slide rail 9 toward the corresponding L-shaped forming concave die 42 to form the required arc-shaped outer convex surface, until the driving inclined surface area 19 of the linear forming convex dies 31 slides out of the inclined surface area 18 on the L-shaped forming convex dies 32; Step 3: Continue to drive the inserting knife 6 upward so that the linear forming punch 31 continues to move outward, while the L-shaped forming punch 32 is no longer moved under force, and the linear forming punch 31 squeezes the linear flange portion 102 embedded therein along the slide rail 9 toward the corresponding linear forming die 41 to form the required arc-shaped outer convex surface.

[0030] The two end faces of the above-mentioned L-shaped forming punch 32 are respectively parallel to the end face of one end of an adjacent straight forming punch 31. A notch groove 191 is provided on the end faces at both ends of each of the L-shaped forming punches 32. One inner side surface of the notch groove 191 forms the driving bevel area 19, and the other inner side surface is parallel to its own end face and can be in sliding contact with the end face of the L-shaped forming punch 32.

[0031] Each of the above-mentioned forming convex molds and each of the forming concave molds is provided with a groove 20 for one end of the spring 8 to be embedded.

[0032] The lower end of each of the above-mentioned inserts 6 passes through the through hole 5 on the lower base plate 1 and is connected to the same movable plate 10 arranged directly below the lower base plate 1. The lower surface of the movable plate 10 that can move in the vertical direction is connected to the piston rod of at least one cylinder 11.

[0033] The lower support plate 2 is provided with a plurality of avoidance through holes 15 for the upper end of the inserting blade 6 to be inserted.

[0034] The inserting blades 6, the through holes 5 on the lower base plate 1 and the avoidance through holes 15 on the lower support plate 2 are all provided in six numbers.

[0035] The upper end of the piston rod of each of the six cylinders 11 is connected to the lower surface of the movable plate 10 to drive the movable plate 10 to move in the vertical direction.

[0036] The working principle of the present invention is as follows: In order to meet the needs of aesthetic appearance and subsequent assembly, it is necessary to further process the flanged portion around the notebook shell to obtain a curved convex surface; In the initial state, the plunger that can move up and down driven by the cylinder is at the lowest end of its stroke. At this time, the forming convex molds in the four directions and at the four corners form a certain gap with the corresponding forming concave molds under the action of the springs, and the second inclined surface on each linear forming convex mold always keeps a close fit with the first inclined surface on the corresponding plunger, and the inclined surface area on each L-shaped forming convex mold is closely fitted with the driving inclined surface area on the corresponding linear forming convex mold; The shell to be punched is mounted on the lower support plate, so that the lower surface of the upper body of the shell fits with the lower support plate and the upper surface of the forming punch, and the flange portion on the shell is embedded in the gap formed by the forming punch and the corresponding forming die under the action of the spring; The cylinder drives the movable plate to move up, and then the movable plate drives multiple inserting knives to move up synchronously with the same stroke. During this process, the first inclined surface of the inserting knife slidingly matched with the second inclined surface on the linear forming punch simultaneously pushes the linear forming punches in four directions upward, and the linear forming punch limited by the slide rail cannot move up, so it can only move horizontally along the slide rail to the outside away from the lower support plate, and the driving inclined surface areas on any two linear forming punches moving outward further push the inclined surface areas on the L-shaped forming punch between them, so that each L-shaped forming punch is synchronously moved outward along its corresponding slide rail toward the direction of the corresponding forming die to extrude the flange portion embedded therein, and the L-shaped forming punch stamps the required arc-shaped outer convex surface on the flange portion of the shell before the linear forming punch. During this process, the driving inclined surface area on the linear forming punch slides relative to the inclined surface area on the L-shaped forming punch until the driving inclined surface area slides out of the inclined surface area; When the driving inclined surface area slides out of the inclined surface area, the linear forming punch continues to move outward, and the L-shaped forming punch is no longer moved by force, and the linear forming punch continues to squeeze the flange part embedded therein toward the corresponding forming die, so that the four linear forming punches can simultaneously stamp the flange part of the shell to form the required arc-shaped outer convex surface; After one stamping is completed, the cylinder drives the inserting knife to move down and reset, and each forming punch is also reset under the action of the spring to keep the second inclined surface on each linear forming punch always in close contact with the first inclined surface on the corresponding inserting knife, and the inclined surface area on each L-shaped forming punch is kept in close contact with the driving inclined surface area on the linear forming punch, and a gap is formed between the forming punch and the corresponding forming die for the flange part on the shell to be embedded; Finally, the shell that has completed the stamping operation is removed and the next shell to be stamped is installed, and the cycle continues.

[0037] When the above-mentioned metal shell arc-shaped precision stamping method is adopted, it is convenient to install the flange part of the shell between the forming punch and the forming die, and the straight forming punches in four directions and the L-shaped forming punches at the four corners can be driven to move synchronously and extrude toward the corresponding forming die through one upward movement of the insert cutter, thereby realizing the synchronous stamping and forming of the flange part of the shell on the entire circumference to obtain the required arc-shaped outer convex surface, which not only improves the efficiency, but also improves the balance, stability and consistency of the stamping force, thereby improving the processing quality.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for precision stamping of arc-shaped metal shells, based on a stamping assembly, characterized in that: The metal shell (100) comprises: a body (101), a straight flange portion (102) bent downward from the edges of four sides of the body (101), and a corner flange portion (103) bent downward from four corners of the body (101); the stamping assembly further comprises: a lower base plate (1) and a lower support plate (2) mounted on the upper surface of the lower base plate (1); the outer sides of the four side surfaces of the lower support plate (2) are each movably provided with a straight line forming convex die (31) corresponding to the straight line flange portion (102) on the shell (100); the outer sides of each of the straight line forming convex dies (31) are correspondingly provided with a straight line forming concave die (4 1), an L-shaped forming convex mold (32) corresponding to the corner flange portion (103) on the shell (100) is movably provided on the outer side of the four corners of the lower support plate (2) and between any two adjacent straight line forming convex molds (31), and an L-shaped forming concave mold (42) is correspondingly provided on the outer side of each L-shaped forming convex mold (32), and the forming concave molds are fixedly mounted on the lower base plate (1), and each of the forming convex molds is movably mounted on the lower base plate (1) via at least one slide rail (9), so that they can each approach the corresponding forming concave mold to form an arc-shaped outer convex surface on the flange portion of the shell (100); The upper surface of the lower base plate (1) is provided with a plurality of through holes (5), the upper ends of a plurality of insert knives (6) movable in the vertical direction correspondingly pass through the through holes (5), the upper end of each insert knives (6) facing the side surface of the linear forming convex mold (3) has a first inclined surface (71), and the lower end of each side surface of the linear forming convex mold (3) facing the lower support plate (2) has a second inclined surface (72) corresponding to the first inclined surface (71), and the second inclined surface (72) is aligned with the lower surface of the linear forming convex mold (3) located below the second inclined surface (72). The first inclined surface (71) is in sliding contact with the lower support plate (2), and the lower parts of the first inclined surface (71) and the second inclined surface (72) extend in a direction away from the lower support plate (2); at least one spring (8) in a compressed state is installed between each forming convex mold and the corresponding forming concave mold; a bevel area (18) is formed on the end surface of the L-shaped forming convex mold (32) facing the corner of the lower support plate (2); and both ends of each of the linear forming convex molds (31) have a driving bevel area (19) in sliding contact with the bevel area (18); The stamping method comprises the following steps: Step 1: placing the metal shell (100) on the lower support plate (2) so that the lower surface of its body (101) contacts the upper surface of the lower support plate (2), and so that its flange portion is embedded in the gap formed between the molding convex die and the corresponding molding concave die under the action of the spring (8); Step 2: driving the inserting knife (6) to move upward, during which the first inclined surface (71) on the inserting knife (6) slidably cooperates with the second inclined surface (72) on the linear forming punch (31) to push the linear forming punch (31) to move horizontally along the slide rail (9) to the outside away from the lower support plate (2); At the same time, the driving inclined surface areas (19) on any two linear forming convex dies (31) that move horizontally outward push the inclined surface area (18) on the L-shaped forming convex dies (32) located between them, so that each L-shaped forming convex dies (32) presses the corner flange portion (103) embedded therein along its corresponding slide rail (9) toward the corresponding L-shaped forming concave die (42) to form the required arc-shaped outer convex surface, until the driving inclined surface area (19) of the linear forming convex dies (31) slides out of the inclined surface area (18) on the L-shaped forming convex dies (32); Step 3: Continue to drive the inserting knife (6) upward so that the linear forming punch (31) continues to move outward, while the L-shaped forming punch (32) is no longer moved under force, and the linear forming punch (31) presses the linear flange portion (102) embedded therein along the slide rail (9) toward the corresponding linear forming die (41) to form the required arc-shaped outer convex surface.

2. The method for precision stamping of arc-shaped metal shells according to claim 1, characterized in that: The included angle between the moving direction of each movable L-shaped forming convex die (32) and the moving direction of the adjacent straight line forming convex die (31) is 45°.

3. The method for precision stamping of arc-shaped metal shells according to claim 1 or 2, characterized in that: The two end faces of the L-shaped forming punch (32) are respectively parallel to the end face of one end of an adjacent straight forming punch (31), and a notch groove (191) is provided on the end faces at both ends of each of the L-shaped forming punches (32), one inner side face of the notch groove (191) forms the driving inclined surface area (19), and the other inner side face is parallel to its own end face and can be in sliding contact with the end face of the L-shaped forming punch (32).

4. The method for precision stamping of arc-shaped metal shells according to claim 1, characterized in that: Each forming convex die and / or each forming concave die is provided with a groove (20) for one end of the spring (8) to be embedded.

5. The method for precision stamping of arc-shaped metal shells according to claim 1, characterized in that: The lower end of each of the inserting knives (6) passes through a through hole (5) on the lower base plate (1) and is connected to a same movable plate (10) arranged directly below the lower base plate (1), and the lower surface of the movable plate (10) movable in the vertical direction is connected to the piston rod of at least one cylinder (11).

6. The method for precision stamping of arc-shaped metal shells according to claim 5, characterized in that: A bottom plate (12) is fixedly mounted on the lower surface of the lower base plate (1), and a movable groove (121) is provided on the upper surface of the bottom plate (12) for the movable plate (10) to be embedded.

7. The method for precision stamping of arc-shaped metal shells according to claim 6, characterized in that: A bottom base plate (13) is spaced apart below the bottom plate (12), and the cylinder (11) is fixedly mounted on the upper surface of the bottom base plate (13).

8. The method for precision stamping of arc-shaped metal shells according to claim 7, characterized in that: The upper surface of the bottom substrate (13) and the lower surface of the bottom plate (12) are connected via a plurality of support bars (14).

9. The method for precision stamping of arc-shaped metal shells according to claim 1, characterized in that: The lower support plate (2) is provided with a plurality of avoidance through holes (15) for the upper ends of the inserting blades (6) to be inserted into.

10. The method for precision stamping of arc-shaped metal shells according to claim 1, characterized in that: The inserting blade (6), the through hole (5) on the lower base plate (1), and the avoidance through hole (15) on the lower support plate (2) are all provided in six numbers.

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