Height girdling die and method for precise edge folding of metal shell

Abstract

The invention discloses a height girdling die and method for precise flanging of a metal shell, the girdling die comprises an upper die plate, an upper mounting plate mounted on the lower surface of the upper die plate, a lower die plate and a lower mounting plate mounted on the upper surface of the lower die plate, and the height girdling die and method are used for machining the metal shell. The metal shell further comprises a body, linear flanging parts and corner flanging parts, the linear flanging parts are bent downwards from the edges of the four edges of the body, the corner flanging parts are bent downwards from the four corners of the body, and a left knife edge insert core and a right knife edge insert core are movably arranged on the left side and the right side of the lower base plate respectively. And a corner knife edge insert core is movably arranged on the outer side of each of the four corners of the lower base plate and is positioned between any two adjacent knife edge insert cores. According to the edge cutting device, synchronous edge cutting is carried out on the flanging part in the whole circumferential direction of the shell, efficiency and edge cutting precision are improved, damage of cutting stress to a product can be reduced in the whole process, the edge cutting effect and the consistency of the edge cutting effect are improved, and the machining quality is improved.

Description

Technical Field

[0001] The invention relates to a high-circular cutting method and a mould for the precise folding of a metal shell, and belongs to the field of electronic product processing. Background Art

[0002] The trimming die is a die that is used to trim the edge of the workpiece to be processed, so that the height, diameter and shape of the workpiece meet the requirements, which is convenient for the next step of assembly. The shell of some laptops is made of metal materials through casting. The flange part of the cast shell is prone to burrs, so it is necessary to use a trimming die for trimming.

[0003] When performing trimming processing, the trimming mold of the prior art usually cuts multiple flange parts of the shell in sequence. If multiple flange parts are cut at the same time, the cutting stress generated by the cutting is likely to cause damage to the product, thereby reducing the trimming efficiency and trimming effect. Summary of the invention

[0004] The purpose of the present invention is to provide a highly circular cutting method and a mold for the precise folding of a metal shell. The highly circular cutting method and the mold for the precise folding of a metal shell can realize synchronous trimming of the flanged portion of the shell in the entire circumference, which not only improves the efficiency and the accuracy of trimming, but also can reduce the damage of the cutting stress to the product in the whole process, improve the trimming effect and the consistency of the trimming effect, and improve the processing quality.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a ring cutting mold, comprising: an upper template, an upper mounting plate installed on the lower surface of the upper template, a lower template and a lower mounting plate installed on the upper surface of the lower template, an upper blade plate is installed on the lower surface of the upper mounting plate, a lower release plate is arranged just above the lower mounting plate, a lower pad is installed in the middle of the upper surface, and the lower surface of the lower release plate is connected to the lower mounting plate by a plurality of springs, at least two corners of the lower mounting plate are respectively installed with a guide column, the upper end of the vertically extending guide column passes through the lower release plate and is slidably embedded in a guide sleeve installed on the upper blade plate, and is used for processing a metal shell, and the metal shell further comprises: a main body, a guide column extending from the edges of the four sides of the main body to the guide column. The straight flange portion bent downward and the corner flange portions bent downward from the four corners of the body, the left and right sides of the lower pad are respectively movably provided with a left blade entry and a right blade entry, the front and rear sides of the lower pad are respectively movably provided with a front blade entry and a rear blade entry, and a corner blade entry can be movably provided on the outer side of the four corners of the lower pad and between any two adjacent blade entries, and the left blade entry, the right blade entry, the front blade entry, and the rear blade entry corresponding to the four straight flange portions on the shell can each be parallel to or away from the lower pad, and the angle formed between the moving direction of each corner blade entry corresponding to the corner flange portion on the shell and the moving direction of the adjacent blade entry is 45°; The upper surface of the lower pad is provided with a mounting through hole, the upper end of the inserting knife connected with the lower mounting plate at the lower end passes through the lower stripping plate and is embedded in the mounting through hole, the upper end of the inserting knife has four first inclined surfaces respectively facing the left blade entry, the right blade entry, the front blade entry and the rear blade entry, at least one transfer block movably mounted on the lower pad is provided between each of the first inclined surfaces and the corresponding blade entry, the end face of one end of each of the transfer blocks is fitted with the corresponding blade entry surface, and the lower part of the other end of each of the transfer blocks has a second inclined surface corresponding to the first inclined surface, 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 respectively extend in the direction close to the corresponding blade entry; The L-shaped corner blade entry has a third bevel area and a fourth bevel area on the end surface facing the corner of the lower pad, and both ends of each of the blade entry have a driving bevel area that is in sliding contact with the third bevel area or the fourth bevel area, and the blade of the corner blade entry is located on the outer side of each blade entry with the blade facing away from the lower pad.

[0006] The further improved scheme in the above technical scheme is as follows: 1. In the above scheme, at least two sliding grooves are provided on the lower surface of each of the blade entries, and a mounting through hole is correspondingly provided on the upper surface of the lower release plate and directly below each sliding groove. The lower part of a slide rail arranged perpendicular to the side surface of the lower pad passes through the corresponding mounting through hole and is connected to the lower stop plate arranged below the lower release plate, and the upper part of the slide rail is correspondingly embedded in the sliding groove and slidably cooperates with the sliding groove, so that the left blade entry, the right blade entry, the front blade entry, and the rear blade entry can each approach or move away from the lower pad in parallel.

[0007] 2. In the above scheme, a notch is provided on the end faces of both ends of each of the blade inserts, one inner side face of the notch is formed as the driving slope area, and the other inner side face is parallel to the end face of the blade insert.

[0008] 3. In the above scheme, the two end faces of the corner blade entry are respectively arranged parallel to the end face of the adjacent blade entry.

[0009] 4. In the above solution, the third bevel area and the fourth bevel area are symmetrically arranged with respect to the central axis of the moving direction of the corner blade.

[0010] 5. In the above scheme, a through hole is provided on the lower surface of the upper blade plate and located on the outer sides of the left blade entry, the right blade entry, the front blade entry and the rear blade entry, so that a circumferential blade is formed at the edge of the lower end of the through hole, and an upper cover plate for contacting the upper surface of the shell is embedded in the upper part of the through hole, and a lower cover plate is arranged directly below the upper cover plate, and the lower surface of the lower cover plate whose upper surface is for contacting the lower surface of the shell is installed on the lower pad.

[0011] 6. In the above scheme, when in the mold closing state, the height of the circumferential blade is higher than the height of the corresponding left blade entry, right blade entry, front blade entry, and rear blade entry.

[0012] 7. In the above scheme, the four side surfaces on the upper end of the lower cover plate are provided with a convex portion extending outward, and the convex portion extending to the top of the blade can form an accommodating gap for the flange portion of the shell to be embedded between the inner wall of the through hole on the upper blade plate in the mold closing state.

[0013] 8. In the above scheme, there are four guide columns, which are respectively located at the four corners of the lower mounting plate.

[0014] A method for highly circular cutting of a metal shell precision folding edge is also provided, comprising the following steps: Step 1: In the mold opening state, the lower stripping plate and the lower mounting plate form a certain interval under the action of the spring, and the insert is located at the lowest end relative to the lower pad. At this time, the blade inserts in the four directions are each kept in close contact with the corresponding transfer block under the action of the spring and close to the side surface of the lower pad at the same time. The blade inserts on the four corners are each made to fit the third inclined surface area or the fourth inclined surface area thereof with the driving inclined surface area on the corresponding blade insert under the action of the spring; At this time, the metal shell to be processed is installed on the lower cover plate so that the flanged parts around the metal shell are located outside the left blade entry, the right blade entry, the front blade entry, the rear blade entry and the corner blade entry; Step 2: mold closing. During the mold closing process, the upper blade plate gradually moves downward under the limit of the guide column and the guide sleeve until the lower surface of the upper cover plate contacts the upper surface of the metal shell. The straight flange part and the corner flange part of the metal shell are located between the convex strip part of the lower cover plate and the inner wall of the through hole on the upper blade plate, and between the circumferential blade and the blade entry. Step 3, continue to close the mold, and the lower stripping plate moves in the direction of the lower mounting plate under the action of the mold closing force to squeeze the spring between the lower mounting plate and the lower stripping plate. During this process, the inserter moves up relative to the lower pad, and the first inclined surface on the inserter that slides with the second inclined surface on the transfer block pushes the transfer block upward in four directions at the same time. However, under the restriction of the slide groove and the lower cover plate, the transfer block cannot move upward, so it can only further push the corresponding blade entry to move horizontally away from the outer side of the lower pad. The movement of any two adjacent blade entry further pushes the corner blade entry between them to move toward the circumferential blade, thereby realizing the trimming operation of the corner flanging part of the metal shell; during this process, the driving inclined surface area on the blade entry slides relative to the third inclined surface area or the fourth inclined surface area on the corner blade entry until the driving inclined surface area slides out of the third inclined surface area or the fourth inclined surface area; Step 4: Continue to close the mold. The corner blade insert is no longer moved by force. The left blade insert, the right blade insert, the front blade insert, and the rear blade insert continue to move toward the circumferential blade under the push of the transfer block, thereby realizing the trimming operation of the straight flanging part of the metal shell.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The highly circular cutting method and mold for the precise folding of a metal shell of the present invention drives the insert knife to move up relative to the lower pad through one mold closing, drives the blades of four straight edges to move outward synchronously, and simultaneously drives the blades of four corners to move outward synchronously, thereby realizing synchronous trimming of the flanged portion of the shell from the four corners to the four straight edges in the entire circumference, which not only improves the efficiency and the accuracy of trimming, but also can reduce the damage of the cutting stress to the product in the whole process, improves the trimming effect and the consistency of the trimming effect, and improves the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a structural schematic diagram of the ring cutting die of the present invention; Attached Figure 2 For attachment Figure 1 Schematic diagram of the cross section of AA; Attached Figure 3 For attachment Figure 2 The enlarged schematic diagram of point B in the middle; Attached Figure 4 Schematic diagram of the splitting of the ring cutting die of the present invention Figure 1 ; Attached Figure 5 Schematic diagram of the splitting of the ring cutting die of the present invention Figure 2 ; Attached Figure 6 It is a partial structural schematic diagram of the ring cutting die of the present invention; Attached Figure 7 For attachment Figure 6 The enlarged schematic diagram of the center C; Attached Figure 8 It is a schematic diagram of the knife edge entering the child in step three of the circumcision method of the present invention; Attached Fig. 9 Schematic diagram of the blade entry in step 4 of the circumcision method of the present invention.

[0017] In the above drawings: 100, housing; 101, body; 102, straight flange portion; 103, corner flange portion; 1, lower stripping plate; 2, lower pad; 31, left blade entry; 32, right blade entry; 41, front blade entry; 42, rear blade entry; 5, mounting through hole; 6, inserting knife; 71, first inclined plane; 72, second inclined plane; 8, transfer block; 9, slide groove; 10, lower cover plate; 11, mounting groove; 12, slide rail; 131, sliding fitting Groove; 132, slide rail; 14, mounting through hole; 15, lower stop plate; 16, corner blade entry; 161, third slope area; 162, fourth slope area; 17, drive slope area; 18, notch groove; 21, upper template; 22, upper mounting plate; 23, lower template; 24, lower mounting plate; 25, upper blade plate; 251, circumferential blade; 261, guide column; 262, guide sleeve; 27, upper cover plate; 28, convex strip; 29, through hole. 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 ring cutting mold, comprising: an upper template 21, an upper mounting plate 22 installed on the lower surface of the upper template 21, a lower template 23 and a lower mounting plate 24 installed on the upper surface of the lower template 23, an upper blade plate 25 is installed on the lower surface of the upper mounting plate 22, a lower stripping plate 1 is arranged just above the lower mounting plate 24, a lower pad 2 is installed in the middle of the upper surface, the lower surface of the lower stripping plate 1 is connected to the lower mounting plate 24 by a plurality of springs, at least two corners of the lower mounting plate 24 are respectively installed with a guide column 26, the upper end of the vertically extending guide column 261 passes through the lower stripping plate 1 and is slidably embedded in a guide sleeve 262 installed on the upper blade plate 25, and is used for processing a metal shell 100, the metal shell 100 further comprising: a main body 101, a straight line bent downward from the edge of the 4 sides of the main body 101, The flange portion 102 and the corner flange portion 103 bent downward from the four corners of the body 101, the left and right sides of the lower pad 2 are respectively movably provided with a left blade entry 31 and a right blade entry 32, the front and rear sides of the lower pad 2 are respectively movably provided with a front blade entry 41 and a rear blade entry 42, and a corner blade entry 16 is movably provided on the outer side of the 24 corners of the lower pad and between any two adjacent blade entries, and the left blade entry 31, the right blade entry 32, the front blade entry 41, and the rear blade entry 42 corresponding to the four straight flange portions 102 on the shell 100 can each be parallel to or away from the lower pad 2, and the angle formed between the moving direction of each corner blade entry 16 corresponding to the corner flange portion 103 on the shell 100 and the moving direction of the adjacent blade entry is 45°; The upper surface of the lower pad 2 is provided with a mounting through hole 5, and the upper end of the inserting knife 6 connected to the lower mounting plate 24 at the lower end passes through the lower stripping plate 1 and is embedded in the mounting through hole 5. The upper end of the inserting knife 6 has four first inclined surfaces 71 respectively facing the left blade entry 31, the right blade entry 32, the front blade entry 41 and the rear blade entry 42, and at least one transfer block 8 movably mounted on the lower pad 2 is provided between each of the first inclined surfaces 71 and the corresponding blade entry, and the end face of one end of each of the transfer blocks 8 is fitted with the corresponding blade entry surface, and the lower part of the other end of each transfer block 8 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 toward the direction close to the corresponding blade entry; The L-shaped corner blade entry 16 has a third slope area 161 and a fourth slope area 162 on its end surface facing the corner of the lower pad 2. Both ends of each blade entry have a driving slope area 17 that is in sliding contact with the third slope area 161 or the fourth slope area 162. The blade of the corner blade entry 16 is located on the outer side of each blade entry with the blade facing away from the lower pad 2. In the initial state, the inserter, which can move up and down under the drive of a driving mechanism (such as a cylinder), is located at the lowest end of its stroke. At this time, the blade inserts in the four directions are each kept in close contact with the corresponding transfer block under the action of a spring and are close to the side surface of the lower pad at the same time. The blade inserts on the four corners are each kept in close contact with the driving inclined surface area of ​​the corresponding blade insert under the action of a spring.

[0020] At least two sliding grooves 131 are provided on the lower surface of each of the above-mentioned blade entries, and a corresponding mounting through hole 14 is provided on the upper surface of the lower release plate 1 and directly below each sliding groove 131. The lower part of a slide rail 132 arranged perpendicular to the side surface of the lower pad 2 passes through the corresponding mounting through hole 14 and is connected to the lower stop plate 15 arranged below the lower release plate 1, and the upper part of the slide rail 132 is correspondingly embedded in the sliding groove 131 and slidably cooperates with the sliding groove 131, so that the left blade entry 31, the right blade entry 32, the front blade entry 41, and the rear blade entry 42 can each be parallel to or away from the lower pad 2.

[0021] The cross sections of the sliding groove 13 and the sliding rail 132 are both T-shaped.

[0022] The slide rail 132 is fixedly connected to the lower stop plate 15 by countersunk screws.

[0023] The lower stop plate 15 is fixedly mounted on the lower surface of the lower stripping plate 1 .

[0024] A notch 18 is provided on the end surfaces of both ends of each of the blade inserts, one inner side surface of the notch 18 forms the driving slope area 17, and the other inner side surface is parallel to the end surface of the blade insert.

[0025] The two end faces of the corner blade entry 16 are respectively arranged parallel to the end face of the adjacent blade entry.

[0026] The third bevel area 161 and the fourth bevel area 162 are symmetrically arranged with respect to the central axis of the moving direction of the corner blade insert 16 .

[0027] A through hole is provided on the lower surface of the upper blade plate 25 and located on the outer sides of the left blade entry 31, the right blade entry 32, the front blade entry 41 and the rear blade entry 42, thereby forming a circumferential blade 251 at the edge of the lower end of the through hole, and an upper cover plate 27 for contacting the upper surface of the shell 100 is embedded in the upper part of the through hole, and a lower cover plate 10 is arranged directly below the upper cover plate 27, and the lower surface of the lower cover plate 10 whose upper surface is used to contact the lower surface of the shell 100 is installed on the lower pad 2.

[0028] When in the mold closing state, the height of the circumferential blade 251 is higher than the height of the corresponding left blade entry 31, right blade entry 32, front blade entry 41, and rear blade entry 42.

[0029] The four side surfaces of the upper end of the above-mentioned lower cover plate 10 are each provided with a convex portion 28 extending outward. The convex portion 28 extending to the top of the blade can form an accommodating gap between the inner wall of the through hole on the upper blade plate 25 for the flange portion 102 of the shell 100 to be embedded in the mold state.

[0030] There are four guide posts 261 , which are respectively located at the four corners of the lower mounting plate 24 .

[0031] Embodiment 2: A ring cutting mold, comprising: an upper template 21, an upper mounting plate 22 installed on the lower surface of the upper template 21, a lower template 23 and a lower mounting plate 24 installed on the upper surface of the lower template 23, an upper blade plate 25 is installed on the lower surface of the upper mounting plate 22, a lower stripping plate 1 is arranged just above the lower mounting plate 24, a lower pad 2 is installed in the middle of the upper surface, the lower surface of the lower stripping plate 1 is connected to the lower mounting plate 24 by a plurality of springs, at least two corners of the lower mounting plate 24 are respectively installed with a guide column 26, the upper end of the vertically extending guide column 261 passes through the lower stripping plate 1 and is slidably embedded in a guide sleeve 262 installed on the upper blade plate 25, and is used for processing a metal shell 100, the metal shell 100 further comprising: a main body 101, a straight line bent downward from the edge of 4 sides of the main body 101, The flange portion 102 and the corner flange portion 103 bent downward from the four corners of the body 101, the left and right sides of the lower pad 2 are respectively movably provided with a left blade entry 31 and a right blade entry 32, the front and rear sides of the lower pad 2 are respectively movably provided with a front blade entry 41 and a rear blade entry 42, and a corner blade entry 16 is movably provided on the outer side of the 24 corners of the lower pad and between any two adjacent blade entries, and the left blade entry 31, the right blade entry 32, the front blade entry 41, and the rear blade entry 42 corresponding to the four straight flange portions 102 on the shell 100 can each be parallel to or away from the lower pad 2, and the angle formed between the moving direction of each corner blade entry 16 corresponding to the corner flange portion 103 on the shell 100 and the moving direction of the adjacent blade entry is 45°; The upper surface of the lower pad 2 is provided with a mounting through hole 5, and the upper end of the inserting knife 6 connected to the lower mounting plate 24 at the lower end passes through the lower stripping plate 1 and is embedded in the mounting through hole 5. The upper end of the inserting knife 6 has four first inclined surfaces 71 respectively facing the left blade entry 31, the right blade entry 32, the front blade entry 41 and the rear blade entry 42, and at least one transfer block 8 movably mounted on the lower pad 2 is provided between each of the first inclined surfaces 71 and the corresponding blade entry, and the end face of one end of each of the transfer blocks 8 is fitted with the corresponding blade entry surface, and the lower part of the other end of each transfer block 8 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 toward the direction close to the corresponding blade entry; The L-shaped corner blade entry 16 has a third slope area 161 and a fourth slope area 162 on its end surface facing the corner of the lower pad 2. Both ends of each blade entry have a driving slope area 17 that is in sliding contact with the third slope area 161 or the fourth slope area 162. The blade of the corner blade entry 16 is located on the outer side of each blade entry with the blade facing away from the lower pad 2. The housing to be trimmed is mounted on the lower cover plate so that the flanged portion thereof is located correspondingly on the outer side of the knife edge entry, and at this time, the lower end surface of the flanged portion is lower than the blade on the knife edge entry and is close to the blade; The driving insert knife moves upward to a fixed stroke. During this process, the first inclined surface on the insert knife that slides with the second inclined surface on the transfer block pushes the transfer block upward in four directions at the same time. However, due to the restriction of the slide slot and the lower cover plate, the transfer block cannot move upward, so it can only further push the corresponding blade entry to move horizontally to the outside away from the lower pad. The movement of any two adjacent blade entry pieces further pushes the corner blade entry piece between them to move horizontally outward, thereby realizing the trimming operation at the corner of the flanging portion of the shell. During this process, the driving inclined surface area on the blade entry piece and the third inclined surface area or the fourth inclined surface area on the corner blade entry piece slide relative to each other until the driving inclined surface area slides out of the third inclined surface area or the fourth inclined surface area; Continue to close the mold, the corner blade insert is no longer moved by force, and the left blade insert, the right blade insert, the front blade insert, and the rear blade insert continue to move horizontally outward under the push of the transfer block, thereby realizing the trimming operation on the straight edge of the flanging part of the metal shell.

[0032] A notch 18 is provided on the end surfaces of both ends of each of the blade inserts, one inner side surface of the notch 18 forms the driving slope area 17, and the other inner side surface is parallel to the end surface of the blade insert.

[0033] A through hole is provided on the lower surface of the upper blade plate 25 and located on the outer sides of the left blade entry 31, the right blade entry 32, the front blade entry 41 and the rear blade entry 42, thereby forming a circumferential blade 251 at the edge of the lower end of the through hole, and an upper cover plate 27 for contacting the upper surface of the shell 100 is embedded in the upper part of the through hole, and a lower cover plate 10 is arranged directly below the upper cover plate 27, and the lower surface of the lower cover plate 10 whose upper surface is used to contact the lower surface of the shell 100 is installed on the lower pad 2.

[0034] There are four guide posts 261 , which are respectively located at the four corners of the lower mounting plate 24 .

[0035] There are two mounting through holes 5 , which are spaced apart along the length direction of the bottom pad 2 .

[0036] A blade 6 is embedded and installed in each of the installation through holes 5 , and each of the blades 6 has three first inclined surfaces 71 arranged toward the blade entry.

[0037] The above-mentioned transfer block 8 is a T-shaped transfer block, and the end surface of the long side of each transfer block 8 is in contact with the entry surface of the knife edge.

[0038] The upper surface of the lower pad 2 is provided with a plurality of slide grooves 9 for the transfer block 8 to be embedded in. The upper surface of the transfer block 8 slidably matched with the inner wall of the slide groove 9 is flush with the upper surface of the lower pad 2 .

[0039] The left blade entry 31 , the right blade entry 32 , the front blade entry 41 and the rear blade entry 42 are each installed on the lower stripping plate 1 through at least two slide rails 10 .

[0040] One transfer block 8 is disposed between each of the left blade entry 31 and the right blade entry 32 and the inserting knife 6 , and two transfer blocks 8 are disposed between each of the front blade entry 41 and the rear blade entry 42 and the inserting knife 6 .

[0041] The left blade entry 31, the right blade entry 32, the front blade entry 41, the rear blade entry 42 and each corner blade entry 16 are each provided with a limit block (not shown in the drawings) on their outer sides, and a plurality of springs (not shown in the drawings) are installed between each of the limit blocks and the corresponding blade entry and are arranged at intervals along the length direction of the blade entry. The springs in a compressed state make the left blade entry 31, the right blade entry 32, the front blade entry 41, and the rear blade entry 42 each press-contact with the corresponding transfer block 8, and the third bevel area 161 or the fourth bevel area 162 of each corner blade entry 16 press-contact with the driving bevel area 17 on the corresponding blade entry.

[0042] The left blade entry 31, the right blade entry 32, the front blade entry 41 and the rear blade entry 42 are each provided with a plurality of mounting grooves 11 on the surface opposite to the lower pad 2 for inserting one end of the spring.

[0043] Embodiment 3: A method for highly circular cutting of a metal shell precision folding edge, based on the circular cutting die, comprises the following steps: Step 1: In the mold opening state, the lower stripping plate 1 and the lower mounting plate 24 form a certain interval under the action of the spring, and the inserting knife 6 is located at the lowest end relative to the lower pad 2. At this time, the blade inserts in the four directions are each kept in close contact with the corresponding transfer block 8 under the action of the spring and are close to the side surface of the lower pad 2 at the same time. The blade inserts on the four corners are each made to fit the third inclined surface area 161 or the fourth inclined surface area 162 on the blade insert with the driving inclined surface area 17 on the corresponding blade insert under the action of the spring; At this time, the metal shell 100 to be processed is installed on the lower cover 10 so that the flanged parts around the metal shell 100 are located outside the left blade entry 31, the right blade entry 32, the front blade entry 41, the rear blade entry 42 and the corner blade entry 16; Step 2: mold closing. During the mold closing process, the upper blade plate 25 gradually moves downward to the plate 1 under the limit of the guide column 261 and the guide sleeve 262 until the lower surface of the upper cover plate 27 thereon contacts the upper surface of the metal shell 100. The flange portion of the metal shell 100 is located between the convex strip portion 28 of the lower cover plate 10 and the inner wall of the through hole 29 on the upper blade plate 25, and between the circumferential blade 251 and the blade entry. Step 3, continue to close the mold, the lower stripping plate 1 moves towards the lower mounting plate 24 under the action of the mold closing force to squeeze the spring between the lower mounting plate 24 and the lower stripping plate 1, during this process, the inserting knife 6 moves upward relative to the lower pad 2, and the first inclined surface 71 on the inserting knife 6 that slides with the second inclined surface 72 on the transfer block 8 pushes the transfer block 8 upward in four directions at the same time, and under the restriction of the slide groove 9 and the lower cover plate 10, the transfer block 8 cannot move upward, so it can only further push the corresponding blade entry to move horizontally away from the outer side of the lower pad, and the movement of any two adjacent blade entry will further push the corner blade entry 16 between them to move toward the circumferential blade, thereby realizing the trimming operation of the corner flanging portion 103 of the metal shell 100; during this process, the driving inclined surface area 17 on the blade entry and the third inclined surface area 161 or the fourth inclined surface area 162 on the corner blade entry 16 slide relative to each other until the driving inclined surface area 17 slides out of the third inclined surface area 161 or the fourth inclined surface area 162; Step 4: Continue to close the mold, the corner blade insert 16 is no longer moved by force, and the left blade insert 31, the right blade insert 32, the front blade insert 41, and the rear blade insert 42 continue to move toward the circumferential blade under the push of the transfer block 8, thereby realizing the trimming operation of the straight flange portion 102 of the metal shell 100; After one trimming is completed, the drive insert moves down and resets, and each blade insert and the corresponding transfer block are also reset under the action of the spring, and the blade insert and the corresponding transfer block always keep the surface in contact during the whole process; Finally, the shell that has completed the trimming operation is removed, and the next shell to be trimmed is installed, and the cycle continues.

[0044] The working principle of the present invention is as follows: Burrs are easily formed on the flanged portion of the shell obtained by casting, and the structural dimensions cannot meet the requirements of subsequent assembly. Therefore, it is necessary to perform trimming on the lower portion of the flanged portion formed around the shell, which can not only remove the remaining burrs, but also accurately meet the requirements of the structural dimensions. In the initial state, the insert knife, which can be moved up and down by the driving mechanism (such as a cylinder), is located at the lowest end of its stroke. At this time, the inserts in the four directions are each kept in close contact with the corresponding transmission block under the action of the spring and close to the side surface of the lower pad at the same time. The inserts at the four corners are each made to fit the third inclined surface area or the fourth inclined surface area thereof with the driving inclined surface area on the corresponding insert knife under the action of the spring; The housing to be trimmed is mounted on the lower cover plate so that the flanged portion thereof is located correspondingly on the outer side of the knife edge entry, and at this time, the lower end surface of the flanged portion is lower than the blade on the knife edge entry and is close to the blade; The driving insert knife moves upward to a fixed stroke. During this process, the first inclined surface on the insert knife that slides with the second inclined surface on the transfer block pushes the transfer block upward in four directions at the same time. However, due to the restriction of the slide slot and the lower cover plate, the transfer block cannot move upward, so it can only further push the corresponding blade entry to move horizontally to the outside away from the lower pad. The movement of any two adjacent blade entry pieces further pushes the corner blade entry piece between them to move horizontally outward, thereby realizing the trimming operation at the corner of the flanging portion of the shell. During this process, the driving inclined surface area on the blade entry piece and the third inclined surface area or the fourth inclined surface area on the corner blade entry piece slide relative to each other until the driving inclined surface area slides out of the third inclined surface area or the fourth inclined surface area; The mold is continued to be closed, and the corner blade insert is no longer moved by force, and the left blade insert, the right blade insert, the front blade insert, and the rear blade insert continue to move horizontally outward under the push of the transfer block, thereby realizing the trimming operation of the straight edge of the flanging part of the metal shell; Cut the corners of the flanged part with greater structural strength first, and then cut the straight edges of the flanged part. This can not only improve the smoothness of the cutting and the smoothness of the cut, but also reduce the damage of the product to the cutting stress, and improve the quality of the product after the trimming is completed. After one trimming is completed, the drive insert moves down and resets, and each blade insert and the corresponding transfer block are also reset under the action of the spring, and the blade insert and the corresponding transfer block always keep the surface in contact during the whole process; Finally, the shell that has completed the trimming operation is removed, and the next shell to be trimmed is installed, and the cycle is repeated.

[0045] It should be noted that during the trimming operation, a clamping assembly is required to limit the cover plate. There are mature solutions in the prior art, which will not be described here.

[0046] When the above-mentioned high-circular cutting method and mold for precise folding of metal shells are adopted, the insert cutter is driven to move up relative to the lower pad through one mold closing, and the blades of the four straight edges are driven to move outward synchronously and the four corner blades are driven to move outward at the same time, thereby realizing synchronous trimming of the flanged portion of the shell from the four corners to the four straight edges in the entire circumference, which not only improves the efficiency and trimming accuracy, but also reduces the damage of the cutting stress to the product in the whole process, improves the trimming effect and the consistency of the trimming effect, and improves the processing quality.

[0047] 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 ring cutting die, comprising: An upper template (21), an upper mounting plate (22) mounted on the lower surface of the upper template (21), a lower template (23), and a lower mounting plate (24) mounted on the upper surface of the lower template (23), wherein an upper blade plate (25) is mounted on the lower surface of the upper mounting plate (22), a lower stripping plate (1) is arranged just above the lower mounting plate (24), and a lower pad (2) is mounted in the middle of the upper surface of the lower stripping plate (1), and a plurality of roots are provided between the lower surface of the lower stripping plate (1) and the lower mounting plate (24). The lower mounting plate (24) is connected with a spring, and at least two corners of the lower mounting plate (24) are each equipped with a guide column (26), and the upper end of the vertically extending guide column (261) passes through the lower stripping plate (1) and is slidably embedded in a guide sleeve (262) installed on the upper blade plate (25), characterized in that: it is used for processing a metal shell (100), and the metal shell (100) further comprises: a main body (101), a straight flange bent downward from the edges of four sides of the main body (101) The bottom plate (102) and the bottom plate (103) are bent downward from the four corners of the main body (101), the left and right sides of the bottom plate (2) are respectively movably provided with a left blade entry (31) and a right blade entry (32), the front and rear sides of the bottom plate (2) are respectively movably provided with a front blade entry (41) and a rear blade entry (42), and the outside of the four corners of the bottom plate (2) and between any two adjacent blade entry are movably provided with a corner entry The blade entry (16), the left blade entry (31), the right blade entry (32), the front blade entry (41), and the rear blade entry (42) arranged corresponding to the four straight flange portions (102) on the shell (100) can each move in parallel close to or away from the lower pad (2), and the included angle between the moving direction of each corner blade entry (16) arranged corresponding to the corner flange portion (103) on the shell (100) and the moving direction of the adjacent blade entry is 45°; The upper surface of the lower pad (2) is provided with a mounting through hole (5); the upper end of a knife (6) connected to the lower mounting plate (24) at a lower end passes through the lower release plate (1) and is embedded in the mounting through hole (5); the upper end of the knife (6) has four first inclined surfaces (71) respectively arranged towards the left blade entry (31), the right blade entry (32), the front blade entry (41) and the rear blade entry (42); at least one transfer block (8) movably mounted on the lower pad (2) is arranged between each of the first inclined surfaces (71) and the corresponding blade entry; the end surface of each of the transfer blocks (8) at one end is in contact with the corresponding blade entry surface, and the lower part of each of the other ends has a second inclined surface (72) corresponding to the first inclined surface (71); 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 a direction close to the corresponding blade entry; The corner blade insert (16) arranged in an L-shape has a third inclined surface area (161) and a fourth inclined surface area (162) on its end surface facing the corner of the lower pad (2), and each of the two ends of the blade insert has a driving inclined surface area (17) that is in sliding contact with the third inclined surface area (161) or the fourth inclined surface area (162), and the blade of the corner blade insert (16) is located on the outer side of each blade insert with the blade facing away from the lower pad (2).

2. The circular cutting die according to claim 1, characterized in that: At least two sliding grooves (131) are provided on the lower surface of each of the blade entry pieces, and a mounting through hole (14) is correspondingly provided on the upper surface of the lower release plate (1) and directly below each of the sliding grooves (131). The lower portion of a slide rail (132) arranged perpendicular to the side surface of the lower pad (2) passes through the corresponding mounting through hole (14) and is connected to a lower stop plate (15) arranged below the lower release plate (1), and the upper portion of the slide rail (132) is correspondingly embedded in the sliding groove (131) and slidably cooperates with the sliding groove (131), so that the left blade entry piece (31), the right blade entry piece (32), the front blade entry piece (41), and the rear blade entry piece (42) can each approach or move away from the lower pad (2) in parallel.

3. The circular cutting die according to claim 1, characterized in that: A notch groove (18) is provided on the end surfaces at both ends of each of the blade inserts, one inner side surface of the notch groove (18) forms the driving slope area (17), and the other inner side surface is parallel to the end surface of the blade insert.

4. The circular cutting die according to claim 3, characterized in that: The two end faces of the corner blade entry (16) are respectively arranged parallel to the end face of the adjacent blade entry.

5. The circular cutting die according to claim 1, characterized in that: The third bevel area (161) and the fourth bevel area (162) are symmetrically arranged with respect to the central axis of the moving direction of the corner blade insert (16).

6. The circular cutting die according to claim 1, characterized in that: A through hole is provided on the lower surface of the upper blade plate (25) and located outside the left blade entry (31), the right blade entry (32), the front blade entry (41) and the rear blade entry (42), so that a circumferential blade (251) is formed at the edge of the lower end of the through hole. An upper cover plate (27) for contacting the upper surface of the shell (100) is embedded in the upper part of the through hole. A lower cover plate (10) is provided directly below the upper cover plate (27). The lower surface of the lower cover plate (10) for contacting the lower surface of the shell (100) is installed on the lower pad (2).

7. The circular cutting die according to claim 6, characterized in that: When in the mold closing state, the height of the circumferential blade edge (251) is higher than the height of the corresponding blade edges of the left blade entry (31), the right blade entry (32), the front blade entry (41), and the rear blade entry (42).

8. The circular cutting die according to claim 6, characterized in that: The four side surfaces of the upper end of the lower cover plate (10) each have a convex strip portion (28) extending outwards, and the convex strip portion (28) extending above the blade insert can form an accommodating gap between the inner wall of the through hole on the upper blade plate (25) in the mold closing state for the flange portion (102) of the shell (100) to be embedded.

9. The circular cutting die according to claim 1, characterized in that: Four guide columns (261) are provided, and are respectively located at four corners of the lower mounting plate (24).

10. A method for highly circular cutting of a metal shell precision folding edge, based on the circular cutting die as claimed in claims 1 to 8, comprising the following steps: Step 1: In the mold opening state, the lower stripping plate (1) and the lower mounting plate (24) form a certain interval under the action of the spring, and the inserting knife (6) is located at the lowest end relative to the lower pad (2). At this time, the blade inserts in the four directions are each kept in close contact with the corresponding transfer block (8) under the action of the spring and are close to the side surface of the lower pad (2). The blade inserts at the four corners are each made to fit the third inclined surface area (161) or the fourth inclined surface area (162) thereof with the driving inclined surface area (17) on the corresponding blade insert under the action of the spring; At this time, the metal shell (100) to be processed is mounted on the lower cover plate (10) so that the flanged portions around the metal shell (100) are located outside the left blade entry (31), the right blade entry (32), the front blade entry (41), the rear blade entry (42) and the corner blade entry (16); Step 2, mold closing. During the mold closing process, the upper blade plate (25) gradually moves downward off the plate (1) under the limit of the guide column (261) and the guide sleeve (262) until the lower surface of the upper cover plate (27) above it contacts the upper surface of the metal shell (100), and the flange portion of the metal shell (100) is located between the convex strip portion (28) of the lower cover plate (10) and the inner wall of the through hole (29) on the upper blade plate (25), and is located between the circumferential blade (251) and the blade entry. Step 3: Continue to close the mold. Under the action of the mold closing force, the lower stripping plate (1) moves toward the lower mounting plate (24) to squeeze the spring between the lower mounting plate (24) and the lower stripping plate (1). During this process, the inserting knife (6) moves upward relative to the lower pad (2). The first inclined surface (71) on the inserting knife (6) that slidably cooperates with the second inclined surface (72) on the transfer block (8) pushes the transfer block (8) upward in four directions at the same time. However, under the restriction of the slide groove (9) and the lower cover plate (10), the transfer block (8) cannot move upward, so it can only further push the knife corresponding to it. The cutter moves horizontally toward the outside away from the lower pad, and the movement of any two adjacent cutter cutters further pushes the corner cutter cutter (16) between them to move toward the circumferential cutter edge, thereby achieving a trimming operation on the corner flange portion (103) of the metal shell (100); during this process, the driving bevel area (17) on the cutter cutter and the third bevel area (161) or the fourth bevel area (162) on the corner cutter cutter (16) slide relative to each other until the driving bevel area (17) slides out of the third bevel area (161) or the fourth bevel area (162); Step 4: Continue to close the mold, the corner blade insert (16) is no longer moved by force, and the left blade insert (31), the right blade insert (32), the front blade insert (41), and the rear blade insert (42) continue to move toward the circumferential blade under the push of the transfer block (8), thereby achieving the trimming operation of the straight flanging portion (102) of the metal shell (100).

Images