A cutting die and a cutting method using the same

Abstract

The present invention discloses a cutting die and a cutting method using the same, belonging to the technical field of cutting. The cutting die includes a first die and a second die. The first die is used to carry the workpiece to be cut, and the second die is closed with the first die to cut the workpiece to be cut. The first die includes a base, a first limiting unit and a second limiting unit. The first limiting unit is fixed on the base, and the first limiting unit is provided with a profiling limiting groove recessed in a first direction, and the profiling limiting groove is adapted to the arc-shaped convex portion of the workpiece to be cut; the second limiting unit includes a positioning pin, and the positioning pin can be inserted into the interface of the workpiece to be cut along a second direction. The present invention improves the positioning accuracy of the product, thereby improving the yield rate.

Description

Technical Field

[0001] The present invention relates to the field of cutting, and particularly to a cutting die and a cutting method using the same. Background Art

[0002] For products such as wireless chargers for mobile phones or watches, as Figure 1 and Figure 2 shown, after the injection molded housing of the product is formed, the piece to be cut 100 includes a housing and a trimming edge 103 surrounding the outer periphery of the housing. After forming, the trimming edge 103 is cut off to obtain the housing. In the prior art, the housing includes a curved surface convex portion 101, and the cutting die is provided with a curved surface profiling groove adapted to the curved surface convex portion 101. First, the curved surface convex portion 101 is placed in the curved surface profiling groove for positioning, and then cutting is performed. However, the profiling positioning between the curved surface convex portion 101 and the curved surface profiling groove is inaccurate, resulting in poor cutting, affecting the quality, and reducing the yield rate. Summary of the Invention

[0003] The purpose of the present invention is to provide a cutting die and a cutting method using the same, which can improve the positioning accuracy of the product and the yield rate.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] On the one hand, a cutting die is provided, which includes a first die and a second die. The first die is used to carry the piece to be cut, and the second die is closed with the first die to cut the piece to be cut. The first die includes:

[0006] A base;

[0007] A first limiting unit, fixed on the base, the first limiting unit is provided with a profiling limiting groove recessed in a first direction, and the profiling limiting groove is adapted to the curved surface convex portion of the piece to be cut;

[0008] A second limiting unit, including a positioning pin, and the positioning pin can be inserted into the interface of the piece to be cut along a second direction.

[0009] In some possible implementation manners, the positioning pin includes a plug joint and a step protruding from the plug joint. When the plug joint is inserted into the interface, the step abuts against the end surface of the piece to be cut provided with the interface.

[0010] In some possible implementation manners, the plug joint of the positioning pin is in clearance fit with the interface.

[0011] In some possible embodiments, the second limiting unit includes a guiding component, the guiding component includes a guiding member and a sliding member slidably connected to the guiding member, the guiding member is fixed to the base, and the positioning pin is fixedly arranged on the sliding member.

[0012] In some possible embodiments, the second limiting unit includes an operating member and a locking component, the locking component is fixedly arranged on the base, the positioning pin is fixedly arranged on the operating member, and when the positioning pin is inserted into the interface, the operating member is locked to the locking component.

[0013] In some possible embodiments, the locking component includes:

[0014] A fixing block, fixedly arranged on the base, and the fixing block is provided with a through hole;

[0015] A locking block, provided with a through hole, and the locking block is elastically connected to the fixing block along the length direction of the through hole;

[0016] The operating member passes through the through hole and the through hole, and the operating member is provided with a limiting portion. When the positioning pin is inserted into the interface and the locking block is in a locked state, the operating member is clamped to the locking block through the limiting portion. When the locking block is in an unlocked state, the operating member can move in the through hole and the through hole.

[0017] In some possible embodiments, the second limiting unit further includes a reset member. When the locking component and the operating member are in an unlocked state, the operating member is reset through the reset member.

[0018] In some possible embodiments, it further includes a carrier connected to the first limiting unit. The workpiece to be cut is arranged in the cavity of the carrier. The carrier is provided with a first hollow part communicated with the profiling limiting groove, and the arc-shaped convex part is exposed outside the carrier through the first hollow part.

[0019] In some possible embodiments, the workpiece to be cut includes a cutting edge surrounding the arc-shaped convex part. The cutting edge is provided with a notch communicated with the interface. The cutting die further includes a carrier connected to the first limiting unit. The workpiece to be cut is arranged in the cavity of the carrier. The carrier is provided with a second hollow part. The notch and the second hollow part form an accommodating space, and the positioning pin extends into the accommodating space to move to be inserted into or separated from the interface.

[0020] On the other hand, a cutting method using the above cutting die is provided, including:

[0021] Put the workpiece to be cut into the first die so that the arc-shaped convex part fits with the profiling limiting groove;

[0022] Insert the positioning pin into the interface and finely adjust the workpiece to be cut.

[0023] The second mold is closed with the first mold to cut the workpiece to be cut.

[0024] Advantages of the present invention:

[0025] A cutting mold and a cutting method using the same provided by the present invention first perform rough positioning on the workpiece to be cut by fitting it with a first limiting unit provided on the first mold, and then perform fine positioning on the workpiece to be cut under the action of an insertion force by a second limiting unit to achieve double positioning of rough positioning and fine positioning; by providing a first limiting unit and a second limiting unit on the first mold to perform double positioning on the workpiece to be cut from different directions before cutting, the positioning accuracy is improved, and defective products caused by inaccurate cutting positions are reduced. By providing a positioning pin and a profiling limiting groove, the self-structure of the workpiece to be cut is fully utilized, and the structure of the cutting mold is simplified. Description of the drawings

[0026] Figure 1 It is a schematic diagram before the workpiece to be cut is cut.

[0027] Figure 2 It is a schematic diagram after the workpiece to be cut is cut.

[0028] Figure 3 It is an exploded view of the cutting mold.

[0029] Figure 4 It is a top view of the cutting mold.

[0030] Figure 5 It is a schematic diagram of the second limiting unit.

[0031] Figure 6 It is a schematic diagram when the positioning pin is inserted into the interface.

[0032] Figure 7 It is a cross-sectional view of the second limiting unit at the locking component position.

[0033] Figure 8 It is a schematic diagram of the operating member.

[0034] Figure 9 It is a schematic diagram of the carrier.

[0035] Figure 10 It is a cross-sectional view of the product in the carrier.

[0036] In the figure:

[0037] 100, workpiece to be cut; 101, arc-shaped convex part; 102, interface; 103, cutting edge; 104, notch; 105, positioning hole;

[0038] 1. First mold; 11. Base; 12. First limiting unit; 121. Profiled limiting groove; 13. Second limiting unit; 131. Positioning pin; 1311. Plug connector; 1312. Step; 1313. Connecting block; 132. Guiding component; 1321. Guide; 1322. Sliding part; 133. Operating part; 1331. Limiting part; 1332. Handle; 1333. Operating rod; 134. Locking component; 1341. Fixed block; 1342. Locking block; 13421. Through hole; 1343. Elastic part; 135. Reset part;

[0039] 2. Second mold; 21. Cutting knife;

[0040] 3. Carrier; 31. First hollow part; 32. Second hollow part; 33. Positioning post. Detailed implementation mode

[0041] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected" and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0044] Such as Figure 1 And Figure 2As shown, the workpiece to be cut 100 initially includes an arc-shaped convex portion, an interface 102, and a cut edge 103. This embodiment provides a cutting die, as Figure 3 and Figure 4 shown, which includes a first die 1 and a second die 2. The first die 1 is used to carry the workpiece to be cut 100, and the second die 2 is closed with the first die 1 to cut the workpiece to be cut 100 so as to cut off the cut edge 103. Among them, the first die 1 includes a base 11, a first limiting unit 12, and a second limiting unit 13. The first limiting unit 12 is fixed on the base 11. The first limiting unit 12 is provided with a profiling limiting groove 121 recessed in the first direction, and the profiling limiting groove 121 is adapted to the arc-shaped convex portion 101 of the workpiece to be cut 100; the second limiting unit 13 includes a positioning pin 131, and the positioning pin 131 can be inserted into the interface 102 of the workpiece to be cut 100 along the second direction.

[0045] By arranging the first limiting unit 12 and the second limiting unit 13 on the first die 1 to perform double positioning on the workpiece to be cut 100 from different directions before cutting, the positioning accuracy is improved, and the defective products caused by inaccurate cutting positions are reduced. By arranging the positioning pin 131 and the profiling limiting groove 121, the self-structure of the workpiece to be cut 100 is fully utilized, and the structure of the cutting die is simplified.

[0046] In one embodiment, the first direction is the up-down direction. Arc-shaped convex portions 101 are respectively convexly provided on the upper and lower sides of the workpiece to be cut 100, and the interface 102 is provided on the circumferential surface of the workpiece to be cut 100 and extends inward along the second direction.

[0047] In one embodiment, metal parts such as charging heads and other structures are installed on the interface 102 of the workpiece to be cut 100. By improving the positioning accuracy, it is avoided that the second die 2 cuts the metal charging head when the second die 2 is closed with the first die 1, so as to prevent the cutting tool 21 of the second die 2 from being damaged, improve the service life, and reduce the cost.

[0048] In one embodiment, as Figure 5 and Figure 6 shown, the positioning pin 131 includes a plug joint 1311 and a step 1312 convexly provided on the plug joint 1311. When the plug joint 1311 is inserted into the interface 102, the step 1312 abuts against the end surface of the workpiece to be cut 100 where the interface 102 is provided, which is used to improve the accuracy of the second-direction limit.

[0049] In one embodiment, the plug connector 1311 of the positioning pin 131 is in clearance fit with the interface 102 to facilitate the insertion of the plug connector 1311 into the interface 102; in one embodiment, the interface 102 is a type-c interface 102, and the outer shape of the plug connector 1311 is the same as that of a type-c plug to facilitate mating with the interface 102. The unilateral clearance between the plug connector 1311 and the interface 102 is about 0.03 mm.

[0050] When the workpiece to be cut 100 is placed in the first mold 1, the positioning pin 131 moves in the second direction and inserts into the interface 102. After cutting is completed, the positioning pin 131 moves in the second direction and disengages from the interface 102. In one embodiment, as Figure 5 shown, the second limiting unit 13 includes a guiding component 132. The guiding component 132 includes a guiding member 1321 and a sliding member 1322 slidably connected to the guiding member 1321. The guiding member 1321 is fixed to the base 11, and the positioning pin 131 is fixed to the sliding member 1322, which improves the moving accuracy of the positioning pin 131 and facilitates insertion into the interface 102. Specifically, the guiding member 1321 can be a guide rail, and the sliding member 1322 is a slider, which is not limited.

[0051] In one embodiment, as Figure 5 and Figure 7 shown, the second limiting unit 13 includes an operating member 133 and a locking component 134. The locking component 134 is fixed to the base 11, and the positioning pin 131 is fixed to the operating member 133. When the positioning pin 131 is inserted into the interface 102, the operating member 133 is locked to the locking component 134, thereby realizing the locking of the positioning pin 131 and preventing the workpiece to be cut 100 from moving due to the movement of the positioning pin 131 during the cutting process.

[0052] In one embodiment, as Figure 8 shown, the operating member 133 includes an operating rod 1333. The positioning pin 131 is fixed to the end of the operating rod 1333. Pushing and pulling the operating rod 1333 drives the positioning pin 131 to move in the second direction. The operating member 133 further includes a handle 1332 connected to the operating rod 1333, which facilitates operation.

[0053] In one embodiment, as Figure 5 and Figure 7As shown, the locking assembly 134 includes a fixed block 1341 and a locking block 1342. The fixed block 1341 is fixedly arranged on the base 11, and the fixed block 1341 is provided with a through hole; the locking block 1342 is provided with a through hole 13421, and the locking block 1342 is elastically connected to the fixed block 1341 along one direction of the through hole 13421; the operating member 133 passes through the through hole 13421 and the through hole, and the operating member 133 is provided with a limiting portion 1331. Specifically, the operating member 133 passes through the through hole 13421 and the through hole. The aperture of the through hole 13421 is not less than the outer diameter of the operating rod 1333. The operating rod 1333 is provided with a limiting portion 1331, and the operating rod 1333 can move in the through hole 13421 and the through hole. When the positioning pin 131 is inserted into the interface 102 and the locking block 1342 is in the locked state, the limiting portion 1331 can be limited to the locking block 1342, thereby preventing the operating rod 1333 from moving and improving the positioning reliability of the positioning pin 131. When the locking block 1342 is in the unlocked state, the operating rod 1333 can move in the through hole 13421 and the through hole. By changing the state of the locking block 1342, the free movement or locking of the operating rod 1333 can be realized.

[0054] In one embodiment, the operating member 133 includes an operating rod 1333. The operating rod 1333 is a smooth shaft with a uniform outer diameter dimension. The smooth shaft is circumferentially cut to form an annular groove, and the groove wall of the annular groove forms the limiting portion 1331. When the positioning pin 131 is inserted into the interface 102 and the locking block 1342 is in the locked state, the groove wall on the side close to the positioning pin 131 abuts against the side surface of the locking block 1342. When the locking block 1342 is in the unlocked state, the smooth shaft moves axially in the through hole 13421 and the through hole. In another embodiment, the operating member 133 includes an operating rod 1333. The operating rod 1333 is a shaft with a large outer diameter at one end and a small outer diameter at the other end. The outer diameter of the end close to the positioning pin 131 is larger, and the outer diameter of the end far from the positioning pin 131 is smaller. The shaft is circumferentially cut and a stepped surface is formed on the side close to the large-diameter end. The stepped surface is the limiting portion 1331. When the positioning pin 131 is inserted into the interface 102 and the locking block 1342 is in the locked state, the stepped surface abuts against the side surface of the locking block 1342. When the locking block 1342 is in the unlocked state, the shaft moves axially in the through hole 13421 and the through hole.

[0055] Specifically, the through hole 13421 can be a long hole, and the length direction of the long hole is the same as the telescopic direction of an elastic member 1343 such as a spring. The through hole 13421 can also be a round hole or a hole with other shapes, which is not limited.

[0056] Specifically, such as Figure 7As shown, a locking block 1342 and a fixed block 1341 are connected by an elastic member 1343 such as a spring. Under the elastic force of the elastic member 1343, the inner wall passing through the hole 13421 abuts against the operating lever 1333. By pressing and releasing the locking block 1342, the switching between the unlocked and locked states is achieved.

[0057] In one embodiment, as Figure 5 shown, the second limiting unit 13 further includes a reset member 135 such as a spring. When the locking assembly 134 and the operating member 133 are in the unlocked state, the operating member 133 is reset by the reset member 135, and the operating member 133 drives the positioning pin 131 to automatically reset, reducing manual operation. Specifically, the spring is sleeved on the operating lever 1333, and the two ends respectively abut against the handle 1332 and the fixed block 1341. Pressing the locking block 1342 makes the locking assembly 134 in the unlocked state, and the spring resets, causing the operating lever 1333 to drive the positioning pin 131 to disengage from the interface 102.

[0058] In one embodiment, as Figure 1 、 Figure 3 、 Figure 4 、 Figure 9 and Figure 10 shown, the cutting also includes a carrier 3 connected to the first limiting unit 12. The workpiece to be cut 100 is arranged in the cavity of the carrier 3, which is used to clamp the workpiece to be cut 100 and deforms during the cutting process. The carrier 3 is provided with positioning posts 33, and the workpiece to be cut 100 is provided with positioning holes 105. When the workpiece to be cut 100 is placed on the carrier 3, the positioning posts 33 pass through the positioning holes 105 to achieve rough positioning. In one embodiment, the carrier 3 is provided with a first hollow portion 31 communicating with the profiling limiting groove 121, and the arc-shaped convex portion 101 is exposed from the carrier 3 through the first hollow portion 31 to facilitate the cooperation between the arc-shaped convex portion and the profiling limiting groove 121.

[0059] In one embodiment, as Figure 1 、 Figure 3 、 Figure 4 and Figure 9 shown, the workpiece to be cut 100 includes a cut edge 103 surrounding the arc-shaped convex portion 101. The cut edge 103 is provided with a notch 104 communicating with the interface 102. The carrier 3 is provided with a second hollow portion 32, and the notch 104 and the second hollow portion 32 form a receiving space. The positioning pin 131 extends into the receiving space to move to plug into or disengage from the interface 102, providing a moving space for the movement of the positioning pin 131. In one embodiment, the positioning pin 131 is connected to the sliding member 1322 through a connecting block 1313 to facilitate the positioning pin 131 to extend into the receiving space.

[0060] In one embodiment, as Figure 9As shown, the first hollow portion 31 and the second hollow portion 32 are connected, facilitating the processing of the carrier 3. Further, the carrier 3 includes an upper cover and a lower cover, facilitating the accommodation of the workpiece 100 to be cut into the cavity formed by the upper cover and the lower cover.

[0061] In one embodiment, as Figure 3 shown, a cutting gasket is provided on the end face of the first limiting unit 12 facing the second mold 2. Specifically, the cutting gasket is connected to the top of the first limiting unit 12 by fasteners, and the cutting gasket is provided with a hollow structure to avoid structural interference when the arc-shaped convex portion 101 is installed into the profiling limiting groove 121; when the second mold 2 and the first mold 1 are closed, the cutting knife 21 of the second mold 2 can abut against the cutting gasket, preventing the cutting knife 21 from damaging the second limiting unit 13 during cutting and extending the service life. If the cutting gasket is worn, it can be replaced.

[0062] In one embodiment, the cutting die further includes a guiding unit (not shown in the figure) fixed to the first mold 1. The second mold 2 moves along the guiding unit, improving the closing accuracy of the second mold 2 and the first mold 1, improving the cutting accuracy, and thus improving the product quality. Specifically, the guiding unit can be a optical axis and a linear bearing sleeved on the optical axis. The optical axis is fixed on the base 11, and the second mold 2 is connected to the linear bearing. When closing the mold, the second mold 2 is pushed to move along the optical axis.

[0063] This embodiment provides a cutting method using the above cutting die, including:

[0064] S1. Place the workpiece 100 to be cut into the first mold 1, and make the arc-shaped convex portion fit with the profiling limiting groove 121;

[0065] S2. Insert the positioning pin 131 into the interface 102 and finely adjust the workpiece 100 to be cut;

[0066] S3. The second mold 2 and the first mold 1 are closed to cut the workpiece 100 to be cut.

[0067] First, the workpiece 100 to be cut is made to fit and roughly positioned through the first limiting unit 12 provided on the first mold 1, and then the workpiece 100 to be cut is finely adjusted under the action of the insertion force through the second limiting unit 13 to achieve precise positioning. Through the dual positioning of rough positioning and precise positioning, the positioning accuracy of the workpiece 100 to be cut before cutting is improved. The first mold 1 and the second mold 2 are closed for cutting, improving the yield rate after cutting.

[0068] In one embodiment, the cutting method includes:

[0069] S11: Install the cutting gasket on the top of the first limiting unit 12;

[0070] S12: Set the positioning hole 105 of the workpiece to be cut 100 on the positioning post 33 of the carrier 3 so as to place the workpiece to be cut 100 on the carrier 3;

[0071] S13: Place the carrier 3 on the first limiting unit 12, and make the arc-shaped convex part fit with the profiling limiting groove 121 by pressing the workpiece to be cut 100;

[0072] S14: Push the second limiting member to insert the positioning pin 131 into the interface 102;

[0073] S15: The second mold 2 is closed to cut the workpiece to be cut 100 to form the cut workpiece to be cut 100;

[0074] S16: The mold is opened, and the cut workpiece to be cut 100 is taken out.

[0075] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A cutting die, characterized in that, it includes a first die (1) and a second die (2). The first die (1) is used to carry the workpiece to be cut (100), and the second die (2) is closed with the first die (1) to cut the workpiece to be cut (100). The first die (1) includes: a base (11); a first limiting unit (12), fixed on the base (11). The first limiting unit (12) is provided with a profiling limiting groove (121) recessed in a first direction, and the profiling limiting groove (121) is adapted to the arc-shaped convex part (101) of the workpiece to be cut (100); a second limiting unit (13), including a positioning pin (131), and the positioning pin (131) can be inserted into the interface (102) of the workpiece to be cut (100) along a second direction; the second limiting unit (13) includes an operating member (133) and a locking assembly (134). The locking assembly (134) is fixedly arranged on the base (11), the positioning pin (131) is fixedly arranged on the operating member (133), and when the positioning pin (131) is inserted into the interface (102), the operating member (133) is locked to the locking assembly (134); the locking assembly (134) includes: a fixing block (1341), fixedly arranged on the base (11), and the fixing block (1341) is provided with a through hole; a locking block (1342), provided with a through hole (13421), and the locking block (1342) is elastically connected to the fixing block (1341) along one direction of the through hole (13421); the operating member (133) passes through the through hole (13421) and the through hole. The operating member (133) is provided with a limiting portion (1331). When the positioning pin (131) is inserted into the interface (102) and the locking block (1342) is in a locked state, the operating member (133) is limited by the limiting portion (1331) to the locking block (1342). When the locking block (1342) is in an unlocked state, the operating member (133) can move in the through hole (13421) and the through hole.

2. The cutting die according to claim 1, characterized in that, the positioning pin (131) includes a plug joint (1311) and a step (1312) protruding from the plug joint (1311). When the plug joint (1311) is inserted into the interface (102), the step (1312) abuts against the end face of the workpiece to be cut (100) provided with the interface (102).

3. The cutting die according to claim 1, characterized in that, the plug joint (1311) of the positioning pin (131) has a clearance fit with the interface (102).

4. The cutting die according to claim 1, characterized in that, The second limiting unit (13) includes a guiding component (132), the guiding component (132) includes a guiding member (1321) and a sliding member (1322) slidably connected to the guiding member (1321), the guiding member (1321) is fixed to the base (11), and the positioning pin (131) is fixedly provided on the sliding member (1322).

5. The cutting die according to claim 1, characterized in that the second limiting unit (13) further includes a reset member (135), when the locking component (134) and the operating member (133) are in an unlocked state, the operating member (133) is reset by the reset member (135).

6. The cutting die according to any one of claims 1-5, characterized in that it further includes a carrier (3) connected to the first limiting unit (12), the workpiece to be cut (100) is arranged in the cavity of the carrier (3), the carrier (3) is provided with a first hollow part (31) communicating with the profiling limiting groove (121), and the arc-shaped convex part (101) is exposed outside the carrier (3) through the first hollow part (31).

7. The cutting die according to any one of claims 1-5, characterized in that the workpiece to be cut (100) includes a trimming edge (103) surrounding the arc-shaped convex part (101), the trimming edge (103) is provided with a notch (104) communicating with the interface (102), the cutting die further includes a carrier (3) connected to the first limiting unit (12), the workpiece to be cut (100) is arranged in the cavity of the carrier (3), the carrier (3) is provided with a second hollow part (32), the notch (104) and the second hollow part (32) form an accommodation space, and the positioning pin (131) extends into the accommodation space to move to plug into or disengage from the interface (102).

8. A cutting method using the cutting die according to any one of claims 1-7, characterized in that it includes: placing the workpiece to be cut (100) into the first die (1) so that the arc-shaped convex part fits with the profiling limiting groove (121); inserting the positioning pin (131) into the interface (102) and finely adjusting the workpiece to be cut (100); closing the second die (2) and the first die (1) to cut the workpiece to be cut (100).

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