JP2019055413A - Punch cutting die and workpiece cutting method - Google Patents

Abstract

To provide a punch cutting die capable of cutting off unnecessary parts at both ends of a V-groove without deforming the V-groove, and a workpiece cutting method.SOLUTION: A punch cutting die according to an embodiment of the present invention, which is used to punch a sheet-like workpiece in cooperation with a punch, comprises a die hole which is formed in an upper part of a body, and an inverted V-shaped cross-section protrusion which is formed on a top surface of the body, which is parallel to the top surface and which is extended on a straight line passing through the die hole when seen from above.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a punching die and a workpiece cutting method.

  Conventionally, there is a cutting method using a punch press as a method of forming a V groove on a sheet-like workpiece. This is a method in which a cutting tip is mounted on a punch press and a V-groove is carved on the back surface of the workpiece with the cutting tip. However, if a V-groove having a certain width and depth is to be inserted by this method, there is a problem that the burden on the cutting tip is increased particularly at the start and end of processing.

  In order to avoid this situation, the V-groove width / depth was gradually increased from the start of machining, and the V-groove width / depth was gradually reduced toward the end of machining. (See Patent Document 1).

  However, when the above method is used, the vicinity of both ends of the V-groove to be formed becomes an unnecessary portion whose width and depth are not desired. Therefore, these unnecessary parts are cut, but depending on the cutting method used at this time, the work surface around the V-groove is crushed. And the distortion also arises in the bending part formed by bending the V groove, and the point that the designability as a product is impaired becomes a problem.

Japanese Patent No. 4471248

  Therefore, an object of the present invention is to provide a punching die and a work cutting method that can cut off unnecessary portions at both ends of a V groove without deforming the periphery of the V groove even when a punch press is used.

  A punching die according to an embodiment of the present invention is a punching die that punches a sheet-like workpiece in cooperation with a punch, a die hole formed in an upper portion of a main body, an upper surface of the main body, and an upper surface. And a protrusion having an inverted V-shaped cross section extending in a straight line passing through the die hole when viewed from above.

  In addition, the workpiece cutting method according to the embodiment of the present invention uses the punching die that punches the workpiece in cooperation with the punching die and the punching die, and has a V-groove extending in the first direction formed on the lower surface. A cutting method for forming a cutting groove extending in a second direction across the V-groove with respect to the V-shaped workpiece and extracting a part from the workpiece, wherein the cutting groove intersects the V-groove. A first partial groove including all or a part of the portion, and a second partial groove connected to both ends of the first partial groove. When forming the cutting groove, the second partial groove is formed, After forming the two-part groove, the die hole is aligned with the transverse part and the protrusion is fitted into the V-groove, and the punch is pushed down from the upper surface of the workpiece toward the lower surface of the punch die. The work Bled, and forming the first groove sections.

  A workpiece cutting method according to another embodiment of the present invention uses a punching die in which a die hole is formed in an upper portion of a main body and a punching punch for punching the workpiece in cooperation with the punching die, in a first direction. A cutting method for extracting a part from the workpiece by forming a cutting groove extending in a second direction crossing the V-groove with respect to the sheet-like workpiece having a V-groove extending on the lower surface, The cutting groove is a first partial groove that is a part of a crossing portion with the V groove and is narrower than the width of the V groove in the second direction, and a second portion that is connected to both ends of the first partial groove. When the cut groove is formed, the second partial groove is formed, and after the second partial groove is formed, the die hole is aligned with the transverse portion, and the upper surface of the workpiece with respect to the punching die To the bottom surface Punching the workpiece pushes down the punching punch, and forming the first groove sections.

  ADVANTAGE OF THE INVENTION According to this invention, even when a punch press is used, the punching die which can excise the unnecessary part of both ends of a V groove, and the cutting method of a workpiece | work can be provided, without deforming a V groove.

It is the schematic explaining the cutting method of the workpiece | work which concerns on a comparative example. It is the schematic explaining the cutting method of the workpiece | work which concerns on a comparative example. It is the schematic explaining the cutting method of the workpiece | work which concerns on a comparative example. It is sectional drawing of the punching die which concerns on the 1st Embodiment of this invention. FIG. 2 is a schematic external view of a punching die according to the same embodiment. It is the schematic explaining the cutting method of the workpiece | work concerning the embodiment. It is the schematic explaining the cutting method of the workpiece | work concerning the embodiment. It is the schematic explaining the cutting method of the workpiece | work concerning the embodiment. It is the schematic of the other punching die which concerns on the same embodiment. It is the schematic explaining the cutting method of the workpiece | work which concerns on the 2nd Embodiment of this invention. It is the schematic explaining the cutting method of the workpiece | work concerning the embodiment. It is a schematic outline drawing explaining the cutting method of the workpiece | work concerning the 3rd Embodiment of this invention. It is an outline drawing of the other punching die concerning the embodiment.

  Hereinafter, a punching die and a workpiece cutting method according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
First, a comparative example which is a premise of the first embodiment of the present invention will be described.
When a sheet-like workpiece is bent into an L-shaped cross section, if a V-groove is formed in advance on the back surface (lower surface) of the workpiece, a sharp bent portion can be obtained.
Here, the V-groove can be formed by using a cutting method in which a die having a cutting tip is attached to the punch press and the V-groove is carved on the back surface of the workpiece by the cutting tip. However, if this cutting method is used to form a constant V-groove with a desired width and depth from the start of processing to the end of processing, the wear of the cutting tip at the start and end of processing increases. Shortening the life of the cutting tip is a problem.

  In order to solve this problem, the following cutting method has been proposed. In other words, in this cutting method, the width and depth of the V-groove are gradually increased until the desired width and depth are obtained after the start of machining, and then the V-groove having the desired width and depth is desired. The width and depth of the V groove are gradually reduced just before the end of processing. By doing so, it is possible to suppress wear of the cutting tip at the start of processing and at the end of processing.

However, in the case of the above-described cutting method, the vicinity of both ends of the V-groove becomes an unnecessary portion that does not have the desired width and depth as the V-groove, so that the unnecessary portion needs to be cut.
1 to 3 are schematic views illustrating a workpiece cutting method according to a comparative example. 1 and 2 are views of a workpiece W sandwiched between clamps CL of a punch press as viewed from above.

  When the above-described cutting method for forming the V-groove is used, as shown by a broken line in FIG. 1, the back surface of the workpiece W extends in the X direction (first direction) and has an unnecessary portion G ′ near both ends. A groove G is formed. Therefore, the part P from which the unnecessary portion G ′ is cut out from the workpiece W is extracted according to the outer shape indicated by the one-dot chain line a111 in FIG.

  Here, in the workpiece cutting method according to the comparative example, the workpiece is cut using a punch press equipped with a punching die (not shown) having a rectangular cutting blade. More specifically, as shown in FIG. 2, the workpiece W is placed so that the longitudinal direction of the cutting blade of the punching die is along the outside of the alternate long and short dash line a111, and both ends of each punch hole H and H ′ are slightly overlapped. Punching from the front to the back. Thereby, since the cutting groove T surrounding the outside of the one-dot chain line a111 is formed in the workpiece W, the part P can be extracted from the workpiece W.

  However, in this cutting method, when the punched hole H ′ that crosses the V-groove G is punched, the surface of the workpiece W is crushed around the V-groove G as shown by a one-dot chain line a131 in FIG. . In this case, the bent portion formed by bending the V-groove G is also distorted, which impairs the design of the final product.

Therefore, in this embodiment, the workpiece W is cut using the punching die 200 shown below.
FIG. 4 is a cross-sectional view of the punching die according to this embodiment.
The punching die 200 includes a punching punch 210 and a punching die 250.
The punching punch 210 has a cylindrical punch guide 211 supported by a punch holder of a punch press so as to be movable up and down. The punch guide 211 also functions as a punch plate that presses the workpiece W in cooperation with the punching die 250 at the lower end thereof. At the lower end of the punch guide 211, a through-hole 212 for inserting a cutting blade 214 described later is formed. On the other hand, a flange 217 is formed at the upper end of the punch guide 211. A retainer collar 218 is engaged with the flange 217.

  A punch body 213 is fitted in the punch guide 211 so as to be movable up and down. The punch body 213 includes an integrally formed cutting blade 214, a retaining portion 215, and a head connecting portion 216. The head connecting portion 216 is disposed above the retaining portion 215, and the punch head 220 is screwed to the upper end thereof. The retaining portion 215 has a substantially cylindrical shape having a thickness approximately equal to the inner diameter of the punch guide 211 and is configured not to pass through the through hole 212 of the punch guide 211. The cutting blade 214 is disposed below the retaining portion 215. The cutting blade 214 has a substantially rectangular cross section, and is formed so as to be able to pass through a through hole 212 of the punch guide 211 and a die hole 253 of a punching die 250 described later. In addition, the cross-sectional shape of the cutting blade 214 may be a square or a rectangle, or a rounded corner or the like.

  A stripper spring 221 is fitted between the retainer collar 218 and the punch head 220 and between the head collar 219, whereby the punch body 213 can be raised and lowered with respect to the punch guide 211. . Normally, unlike FIG. 4, the punch body 213 is pulled up.

  The punching die 250 has a die body 251 and an ejector plate 260. As shown in FIG. 4, the die body 251 has a substantially convex cross section having an upper portion 252 and a shoulder portion 257. A die hole 253 through which the cutting blade 214 of the punching punch 210 is inserted is formed on the upper surface of the upper portion 252 of the punching die 250, and a through hole 256 extending from the bottom surface to the die hole 253 is formed at the center of the punching die 250. Has been. The through hole 256 is used for discharging the workpiece K from the waste K.

  Further, a bolt hole 258 extending from the bottom surface to the upper surface of the shoulder portion 257 and a bottomed spring hole 259 opening at the upper surface of the shoulder portion 257 are formed in the shoulder portion 257 of the die body 251.

  On the other hand, the ejector plate 260 is formed in a substantially donut shape having a through hole 261 at the center thereof. The ejector plate 260 is disposed on the shoulder 257 of the die body 251 with the upper portion 252 of the die body 251 inserted through the through hole 261. The ejector plate 260 is fixed to the die body 251 so as to move up and down by strip bolts 262 passing from the bottom of the die body 251 through the bolt holes 258. Further, the ejector plate 260 is normally pushed up by the action of the clamp spring 263 incorporated in the spring hole 259 of the die body 251. The punching die 200 can be securely fixed by sandwiching the workpiece W between the bottom surface of the punch guide 211 and the top surface of the ejector plate 260 by the action of the clamp spring 263.

Furthermore, in the case of this embodiment, the punching die 200 has the following characteristics.
FIG. 5 is a schematic view of a punching die according to the present embodiment. 5A is a top view of the punching die 250, and B in FIG. 5 is a cross-sectional view of the punching die 250 in a normal state. In addition, the D1 direction and D2 direction in FIG. 5 are orthogonal to each other.

  A die hole 253 connected to the through hole 256 is formed on the upper surface of the punching die 250. The die hole 253 is formed in a substantially square shape that can be inserted through the cutting blade 214 of the punching punch 210. In the case of FIG. 5, the die hole 253 is formed in a square shape. Further, on the upper surface of the punching die 250, a set of protrusions 254 disposed with the die hole 253 interposed therebetween is formed in the D1 direction. These protrusions 254 are formed on a straight line that is parallel to the upper surface of the die body 251 and extends in the D1 direction through the die hole 253 when viewed from above. The protrusion 254 is formed in an inverted V-shaped cross section whose ridgeline extends in the D1 direction, and the width w221 and the height h221 in the D2 direction are formed on the back surface (lower surface) of the workpiece W to be processed. It matches the width and height of the V-groove G. In addition, as shown in B in FIG. 5, the protrusion 254 may be formed so as to gradually become lower as the distance from the die hole 253 increases, as necessary.

  Here, the punching die 250 realizes an eject function by the above structure. That is, the ejector plate 260 is normally pushed up with respect to the die body 251. In this case, the protrusion 254 is hidden at a position lower than the upper surface of the ejector plate 260 (see B in FIG. 5). When the ejector plate 260 is pushed down to the die body 251 side, the protrusion 254 appears at a position higher than the upper surface of the ejector plate 260 (see FIG. 4). With this eject function, it is possible to prevent problems such as the protrusion 254 being caught on the work W or being scratched when the work W is moved.

Next, a method for cutting the workpiece W according to the present embodiment will be described.
The cutting method of this embodiment uses a punching die 100 in addition to the punching die 200 shown in FIGS. This punching die 100 has the same structure as that of the punching die 200 except that no protrusion is formed on the punching die. If the die hole of the punching die 100 is made the same as the die hole 253 of the punching die 200, the punching punch 210 can be used as it is.

6 to 8 are schematic views for explaining a workpiece cutting method according to this embodiment.
First, in step S101 shown in FIG. 6, a partial groove T2 (second partial groove) is formed using a punch press equipped with a punching die 100. Here, the partial groove T2 is a groove formed outside the range including the crossing portion with the V groove G indicated by the shaded a232 in the cutting groove T surrounding the outside of the alternate long and short dash line a231. Hereinafter, a portion where the cutting groove T crosses the V groove G may be referred to as a “V groove crossing portion”.

  The partial groove T2 is formed by punching from the front surface to the back surface of the workpiece W so that the longitudinal direction of the cutting blade of the punching die 100 is along the outer side of the alternate long and short dash line a231 and both ends of each punch hole H2 are slightly overlapped. Go. However, in step S101, at least the entire V groove crossing portion a232 is left without being punched.

Subsequently, in step S102 shown in FIG. 7, a partial groove T1 (first partial groove) is formed using a punch press equipped with a punching die 200. Here, the partial groove T1 is a part left in step S101 in the cutting groove T and is a groove including the entire V-groove crossing part. In this step S102, the die hole 253 is aligned with the V-groove crossing portion, and the protrusion 254 is fitted into the V-groove G as shown in FIGS. 7 and 8, and the workpiece W is punched and placed on the die 250. Then, the punching punch 210 is pushed down from the front surface to the back surface of the workpiece W to form a partial groove T1 whose both ends are connected to the partial groove T2. As a result, a cutting groove T composed of the partial grooves T1 and T2 is formed, and the part P having no unnecessary portion G ′ can be extracted from the workpiece W.
The above is the workpiece cutting method according to the present embodiment.

Finally, effects of the punching die 250 and the workpiece W cutting method according to the present embodiment will be described.
As described above, the punching die 200 is used in a state in which the protrusion 254 of the punching die 250 is fitted in the V groove G of the workpiece W. In this case, as shown in FIG. 8, the V-groove G is supported by the protrusion 254, so even if the periphery of the V-groove G is pushed by the cutting blade 214 of the punching punch 210, deformation around the V-groove G is suppressed. be able to. That is, as in the method for cutting the workpiece W according to the present embodiment, the V-crossing portion is formed by leaving only the V-groove crossing portion of the cutting groove T, and then the punching die 200 is used to punch out the V-groove crossing portion. The component P can be extracted without deforming the periphery of the V groove G. As a result, according to the workpiece W cutting method according to the present embodiment, a sharp bent portion without distortion can be obtained as compared with the comparative example.

Next, a modification of the punching die 250 that can be used in the above manufacturing method will be described.
The punching die 250 shown in FIG. 6 is composed of a die body 251 and an ejector plate 260. However, if the eject function is not required, the structure of the punching die can be further simplified.

  FIG. 9 is a schematic view of another punching die according to the present embodiment. 9A is a top view of the punching die 280, and B in FIG. 9 is a cross-sectional view of the punching die 280. In addition, the D1 direction and D2 direction in FIG. 9 are orthogonal to each other.

  The punching die 280 shown in FIG. 9 has a configuration of only a die body 281 that does not have an ejector plate. A die hole 283 connected to the through hole 286 is formed on the upper surface of the die body 281. The die hole 283 is formed so that a cutting blade of a punching punch can be inserted. For example, the die hole 283 is formed in a rectangle whose longitudinal direction is the D2 direction. In addition, a set of protrusions 284 are formed on the upper surface of the die body 281, similarly to the protrusions 254 of the punching die 250, with a die hole 283 interposed therebetween. Thus, since the punching die 280 has a simple structure without an ejector plate, a die hole having a more free size and shape is selected and formed as in the die hole 283 compared to the punching die 250. It becomes possible.

[Second Embodiment]
In the first embodiment, the punching die 200 having the protrusions 254 and the method for cutting the workpiece W using the punching die 200 have been described. On the other hand, in the second embodiment, a workpiece W cutting method that can be executed only by the punching die 100 without the protrusion 254 will be described.

10 and 11 are schematic diagrams for explaining a cutting method for the workpiece W according to the present embodiment.
First, in step S201 shown in FIG. 10, a partial groove T2 (second partial groove) is formed using a punch press equipped with a punching die 100. Here, the partial groove T2 of the present embodiment is a part of the V-groove crossing portion and the Y direction (second direction) as shown in A of FIG. ) Except for a portion narrower than the width w312 of the V-groove G. As in the case of step S101 of the first embodiment, the partial groove T2 is formed so that the longitudinal direction of the cutting blade of the punching die 100 is along the alternate long and short dash line a133, and both ends of each punch hole H2 slightly overlap each other. Punching from the front of W toward the back. However, in step S201, unlike step S101, only a portion having a width w311 narrower than the width w312 of the V groove G in the Y direction is left among the V groove crossing portions as shown in FIG.

Subsequently, in step S202 shown in FIG. 11, the partial groove T1 (first partial groove) is continuously formed by using a punch press equipped with the punching die 100. Here, the partial groove T1 is a portion left in step S201 in the cutting groove T. As a result, a cutting groove T composed of the partial grooves T1 and T2 is formed, and the part P having no unnecessary portion G ′ can be extracted from the workpiece W.
The above is the cutting method of the workpiece W according to the present embodiment.

  In the case of this embodiment, unlike the first embodiment, in the first step S201, only a portion narrower than the width w312 of the V groove G is left among the V groove crossing portions. As a result, in the subsequent step S202, the pressure by the cutting blade 214 can be applied only to the portion where the V groove G is formed, so that deformation around the V groove G can be suppressed as compared with the comparative example.

  Further, in the case of cutting using a punch press, a follow-up seam may occur at an overlapping portion of adjacent punch holes. And this overtaking seam becomes a factor which impairs the beauty of the final product. In this regard, in the case of the present embodiment, if attention is paid to the overtaking seam between the perforation hole H1 and the adjacent perforation hole H2, these oversight seams are the ends of the perforation hole H2 that is punched first, that is, the locations shown in FIG. will occur at p321. However, since these overtaking seam points p321 are bent, they hardly appear in the final appearance of the product. That is, according to this embodiment, the influence on the aesthetics of the product by the overtaking seam can be reduced as compared with the first embodiment.

[Third Embodiment]
In the third embodiment, a modification of the method according to the second embodiment will be described.
FIG. 12 is a schematic diagram illustrating a workpiece cutting method according to the present embodiment.
First, in step S301 (not shown), as in step S201 of the second embodiment, the partial groove T2 is formed using a punch press equipped with a punching die 100. As in the second embodiment, the partial groove T2 is a part of the cutting groove T, and is a groove that is located in the V-groove crossing portion and excludes a portion narrower than the width of the V-groove G in the Y direction.

Subsequently, in step S302 shown in FIG. 12, the partial groove T1 is formed using a punch press equipped with the punching die 200. In step S302, as in step S102 of the first embodiment, the die hole 253 is aligned with the V-groove crossing portion and the protrusion 254 is fitted in the V-groove G, and the workpiece W is punched and placed on the die 250. Then, the workpiece W is punched from the front surface to the back surface of the workpiece W to form the partial groove T1. As a result, a cutting groove T composed of the partial grooves T1 and T2 is formed, and the part P having no unnecessary portion G ′ can be extracted from the workpiece W.
The above is the cutting method of the workpiece W of this embodiment.

  According to the present embodiment, since the V-groove G can be supported by the protrusion 254 of the punching die 200 in step S302, deformation around the V-groove G can be further suppressed as compared with the second embodiment.

  In addition, when there are a plurality of V grooves extending in different directions using the method according to the present embodiment, and these unnecessary portions are to be continuously cut, a plurality of sets of protrusions arranged at different angles with the die hole as a center. You can also use a die with a punch. For example, when it is desired to continuously cut the unnecessary portion G ′ of the two V grooves G extending in the X direction and the unnecessary portion G ′ of the other V groove G extending in the Y direction, the punching die 250 is used instead of the punching die 250. It is convenient to use the punching die 350 shown.

  Like the punching die 250, the punching die 350 has a square die hole 353 formed on the upper surface of the die body 351. The punching die 350 has a protrusion 354 extending in the D1 direction similar to the protrusion 254 of the punching die 250. In addition, the punching die 350 has an inverted V-shaped cross section on a straight line passing through the die hole 353 and extending in the D2 direction. A projection 355 having a shape is provided. That is, the punching die 350 has two sets of protrusions 354 and 355 extending in the D1 direction and the D2 direction perpendicular to each other around the die hole 353.

  For example, when an unnecessary portion of the V-groove extending in the X direction is first deleted, the workpiece W is placed with the die hole 353 of the punching die 350 aligned with the V-groove crossing portion and the projection 354 fitted into the V-groove. In this case, the protruding portion 355 protrudes from the bottom surface of the workpiece W. However, in the case of the method according to this embodiment, the punched holes H2 are already formed on both sides in the Y direction of the V groove crossing portion. The protrusion 354 does not interfere with the back surface of the workpiece W. Subsequently, when an unnecessary portion of another V groove extending in the Y direction is deleted, the die hole 353 of the punching die 350 is aligned with the V groove crossing portion, and the protrusion 355 is fitted into the V groove. Also in this case, since the hole H2 is already formed on both sides in the X direction of the V-groove crossing portion, the protrusion 355 does not interfere with the back surface of the workpiece W. As described above, when it is desired to process a plurality of V grooves extending in the orthogonal direction, the punching die 350 can be used without changing the angle of the workpiece W.

[Others]
As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 100, 200 ... Punching die, 210 ... Punch punch, 211 ... Punch guide, 212 ... Through-hole, 213 ... Punch body, 214 ... Cutting blade, 215 ... Drop Stopping portion, 216... Head connection portion, 217... Flange, 218 .. retainer collar, 219... Punch head collar, 220 .. punch head, 221. , 350 ... punching dies, 251, 281, 351 ... die body, 252 ... upper part, 253, 283, 353 ... die holes, 254, 284, 354, 355 ... projections, 256 ... through hole, 257 ... shoulder, 258 ... bolt hole, 259 ... spring hole, 260 ... ejector plate, 261 ... through 262 ... Strip bolt, 263 ... Clamp spring, CL ... Clamp, G ... V groove, G '... Unnecessary part, H, H', H1, H2 ... Punched hole, P: Parts, T: Cutting grooves, T1, T2: Partial grooves, W: Workpieces.

Claims (7)

A punching die that punches a sheet-like workpiece in cooperation with a punch,
A die hole formed in the upper part of the main body;
A punching die comprising: a protrusion having an inverted V-shaped cross section formed on an upper surface of the main body and extending in a straight line passing through the die hole as viewed from above. The punching die according to claim 1, wherein the protruding portion is lowered as the protrusion is moved away from the die hole. The die hole is rectangular when viewed from above,
The punching die according to claim 1, wherein the protrusion extends in a direction orthogonal to a longitudinal direction of the die hole. The punching die according to any one of claims 1 and 2, wherein the protrusion is formed on a plurality of straight lines that pass through the die hole as viewed from above. A punching die for punching a workpiece in cooperation with the punching die according to any one of claims 1 to 3, and the sheet-like workpiece having a V-groove extending in a first direction formed on a lower surface thereof. On the other hand, a cutting method for forming a cutting groove extending in a second direction crossing the V-groove and extracting a part from the workpiece,
The cutting groove includes a first partial groove including all or a part of a crossing portion with the V groove, and a second partial groove connected to both ends of the first partial groove,
When forming the cutting groove,
Forming the second partial groove;
After the formation of the second partial groove, the die hole is aligned with the transverse portion and the protrusion is fitted into the V groove, and the punching punch is applied to the punching die from the upper surface of the workpiece toward the lower surface. A work cutting method comprising: pressing down and punching the work to form the first partial groove. The work cutting method according to claim 5, wherein the first partial groove is narrower than a width of the V groove in the second direction. Using a punching die in which a die hole is formed in the upper part of the main body and a punching punch for punching the workpiece in cooperation with the punching die, a sheet-like workpiece in which a V-groove extending in the first direction is formed on the lower surface A cutting method for forming a cutting groove extending in a second direction crossing the V-groove and extracting a part from the workpiece,
The cutting groove is a first partial groove that is a part of a crossing portion with the V groove and is narrower than the width of the V groove in the second direction, and a second portion that is connected to both ends of the first partial groove. Including grooves,
When forming the cutting groove,
Forming the second partial groove;
After forming the second partial groove, the die hole is aligned with the transverse portion, the punch is pushed down from the upper surface of the workpiece toward the lower surface of the punching die, and the workpiece is punched. A workpiece cutting method characterized by forming a groove.

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