JP5871230B2 - Tool having a cutting edge part, manufacturing method of a tool having a cutting edge part, and manufacturing method of a tool manufacturing intermediate having a cutting edge part - Google Patents

Description

  The present invention relates to a tool including a cutting edge, a manufacturing method of a tool including a cutting edge, and a manufacturing method of a manufacturing intermediate of a tool including a cutting edge.

  In a tool including a cutting edge portion such as a blade or a needle formed by processing a steel material, it is usually required to increase the hardness of the cutting edge portion. For this reason, high hardness is conventionally performed by quenching the cutting edge. Examples of the quenching method include a method in which the entire steel material is quenched, and then the cut portion is formed by machining. However, in this method, it is necessary to machine a hardened steel material to form the shape of a blade or the like, which is not an efficient method.

  In view of such a situation, the present inventors have proposed a method in which non-patent document 1 selectively laser quenches only the cutting edge after forming the cutting edge by machining the steel material before quenching. . According to this method, a hardened cutting edge can be obtained without machining the hardened steel material. However, if the heat input to the cutting edge is insufficient, the target hardness cannot be obtained, and if the heat input is excessive, the tip of the cutting edge (cutting edge) will melt and become rounded. It must be done strictly.

Keiji OGAWA, Heisaburo NAKAGAWA and Akira OHTSUKA "On-machine Heat Treatment System Using YAG Laser: Laser Hardening of Micro-Cutting Edge" Key Engineering Materials Vols. 447-448 (2010) pp203-207

  However, since the heat capacity of the cut portion is small and the heat capacity or the like changes depending on the shape of the cut portion, it is not easy to set quenching conditions. Such condition setting becomes more difficult as the size of the cutting edge portion such as a fine blade or a needle (pin) becomes smaller and the shape becomes complicated. Moreover, when irradiating a laser beam along a cutting edge part, it is necessary to grasp | ascertain the operation | movement precision of a quenching apparatus beforehand and to correct | amend operation | movement depending on the case. For this reason, it is not easy to perform highly accurate processing by the method disclosed in Non-Patent Document 1.

  A tool having a cutting edge portion according to the present invention includes a cutting edge portion formed by processing a steel material, the cutting edge portion is laser-hardened, and has a higher hardness than the other portions. This portion is characterized in that it has a surface that does not have a quenching oxide film formed by the laser quenching.

  The tool according to the present invention includes a substrate and a blade or a needle protruding from the surface of the substrate, and the cutting edge portion is provided at a tip portion of the blade or the needle, and a base portion of the blade or the needle. It can be set as the structure whose hardness is higher than.

  In addition, even when the cut portion has a cross-sectional shape that is symmetrical with respect to a virtual line that passes through the tip and is substantially perpendicular to the substrate, the hardness distribution is different from each other on both sides of the virtual line. Can do.

  The manufacturing method of the tool provided with the cut-out portion according to the present invention includes a step of preparing a steel material, and laser hardening a region wider than a formation planned region of the cut-out portion of the steel material to form a hardened region in a part of the steel material. A quenching step of machining, and a machining step of machining the steel material in which the quenching region is formed to form the cut portion in the quenching region.

  In the machining step, the steel material is machined to form a substrate and a blade or a needle protruding from the surface of the substrate, and only the tip of the blade or the needle is formed in the quenching region. The tip portion can be provided at the tip portion.

  Further, the shape of the blade viewed from the tip side includes a curved portion, and in the quenching step, the quenching region including a curved portion pattern corresponding to the curved portion is formed, and the curved portion As the radius of curvature of the pattern decreases, the width of the curved pattern can be increased.

  Further, in the machining step, the steel material can be machined by shifting the tip of the cut portion from the center of the quenching region.

  The manufacturing method of the manufacturing intermediate of the tool provided with the cutting edge part according to the present invention includes a step of preparing a steel material, and laser quenching a region wider than a formation planned area of the cutting edge part of the steel material, and a part of the steel material And a step of forming a quenching region.

  According to the present invention, it is possible to obtain a cutting edge portion with increased hardness by a simple method. In addition, it is possible to obtain a cutting edge having a target hardness and hardness distribution with high accuracy.

According to the present invention, since the steel material is machined after laser hardening in a region wider than the region where the steel material's cutting edge is to be formed, the cutting material is formed in the quenching region, and therefore the shape of the cutting material is strictly supported. The quenching is not required, and it is easier to set the quenching conditions than the method of selectively laser quenching the cutting edge. In addition, according to the present invention, since the quenching region is formed only in a part of the steel material, machining is easier than in the case of quenching the entire steel material.
Furthermore, even if the shape of the cutting edge portion is fine or complicated, it is only necessary to form the cutting edge portion in the quenching region, so that the cutting edge having the desired hardness and hardness distribution can be accurately obtained by simple machining. Part can be obtained.

It is a perspective view which shows the fine blade which is the 1st Embodiment of this invention. It is a top view which shows the fine blade which is the 1st Embodiment of this invention. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a figure which shows the manufacturing process of the fine blade which is the 1st Embodiment of this invention. It is a top view which shows the manufacture intermediate body of the fine cutter which is the 1st Embodiment of this invention. It is the B section enlarged view of FIG. It is CC sectional view taken on the line of FIG. It is a figure which shows the modification of the fine blade which is the 1st Embodiment of this invention. It is a figure which shows the other modification of the fine blade which is the 1st Embodiment of this invention. It is a perspective view which shows the pin array which is the 2nd Embodiment of this invention. It is a figure which shows the manufacture intermediate body of the pin array which is the 2nd Embodiment of this invention. It is a figure which shows the modification of the pin array which is the 2nd Embodiment of this invention. It is a top view which shows the manufacture intermediate body which is the 3rd Embodiment of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings.
The drawings referred to in the embodiments are schematically described, and the dimensional ratios of the illustrated components may differ from the actual products. Specific dimensional ratios and the like should be determined in consideration of the following description.
Further, in this specification, the term “substantially equivalent” such as “substantially equivalent” includes not only “equivalent” but also “a state that can be regarded as substantially equivalent”.

  Hereinafter, the fine cutter 10 according to the first embodiment will be described in detail with reference to FIGS. The pin array 30 according to the second embodiment will be described in detail with reference to FIGS. However, application of the present invention is not limited to these embodiments. The present invention can also be applied to, for example, a cutting blade, a ruled blade, a drill bit, and the like.

<First Embodiment>
First, the configuration of the fine blade 10 will be described in detail.
1-3 is a figure which shows the fine cutter 10. FIG. 1 and 2 are a perspective view and a plan view, respectively, showing the fine blade 10, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, showing a state in which the blade 12 is cut along the width direction. In FIG. 3, dots are attached to a portion hardened by laser hardening, and the density of the dots is increased as the hardness is higher.

  1 to 3 includes a substrate 11 and a blade 12 protruding from the substrate surface 11s. The fine blade 10 has, for example, a form in which a substrate 11 and a blade 12 are integrally formed by machining a bulk steel material, but the substrate 11 and the blade 12 are configured as separate members, and the blade 12 is formed on the substrate surface 11s. It may be a joined form. The fine blade 10 is suitable for a die-cutting blade such as a Thomson blade, and can be used for punching paper such as cardboard, a seal, a label, an optical film, and a flexible printed board.

  It is preferable to use tool steel or blade steel for the steel material constituting the fine blade 10. However, a steel material is not limited to this, It can select suitably according to a process target. Examples of steel materials include bearing steel, mechanical structural steel, spring steel, etc. in addition to tool steel and blade steel according to the application classification. Moreover, according to the component classification, carbon steel (ordinary steel), alloy steel (special steel), chromium steel, nickel chromium steel, nickel chromium molybdenum steel, manganese steel and the like can be mentioned. Below, the steel material which is not hardened may be called a base material.

  The fine blade 10 is a substrate-integrated blade in which one ring-shaped blade 12 is provided on one substrate 11 as described above. The substrate 11 has a substantially rectangular shape in plan view, and a blade 12 is erected substantially vertically on a flat substrate surface 11s. That is, the substrate 11 is a support for the blade 12 and has, for example, a reinforcing function for the blade 12. Here, the plan view of the substrate 11 means that the substrate 11 is viewed from directly above the substrate surface 11s (see FIG. 2). The term “plan view” is also used for the blade 12 with the same meaning.

  The blade 12 includes a cutting edge portion 13 that is a cutting edge portion formed by processing a steel material. The blade edge portion 13 is a portion that is strongly pressed against the object to be processed and that requires high hardness. For example, it is a portion where the blade surface 13 f is formed, and is provided at the tip of the blade 12. The blade surface 13f is a surface that intersects the height direction of the blade 12 and is cut obliquely toward the blade edge 13t that is the tip (cut edge) of the blade edge portion 13. The blade edge part 13 illustrated in FIG. 3 has two blade surfaces 13f and is a double-edged blade having a symmetrical cross-sectional shape with the blade edge 13t interposed therebetween.

  In the blade 12, only the blade edge portion 13 is laser-hardened, and portions other than the blade edge portion 13 are not laser-hardened. Further, the substrate 11 is not quenched. The cutting edge portion 13 has a higher hardness than other portions including the root portion 14 of the blade 12. Thereby, while maintaining the toughness of the root portion 14 and suppressing the breakage of the blade 12, it is possible to improve the punching characteristics of the workpiece by increasing the hardness of the blade tip portion 13.

  The blade 12 generally has, for example, a ring shape including a plurality of curved portions 12a, 12b, and 12c having different curvature radii. Here, the curved portion means a portion that is bent when the blade 12 is viewed in plan from the tip (blade tip 13) side (see FIG. 2). Since the planar view shape of the blade 12 corresponds to the punching shape to be processed, it can be appropriately changed according to the target punching shape. For example, a non-ring shape may be sufficient and the complicated shape corresponding to various patterns may be sufficient. A plurality of blades 12 may be provided on the substrate 11.

  The blade edge portion 13 is a double-blade type having a cross-sectional shape that is symmetrical with respect to a virtual line X that passes through the blade edge 13t and is substantially perpendicular to the substrate 11 (substrate surface 11s). In the blade edge portion 13, the angle α formed by the one blade surface 13 f and the imaginary line X and the angle β formed by the other blade surface 13 f and the imaginary line X are substantially the same, for example, the blade edge angle of the blade edge portion 13. (Α + β) is about 20 to 60 °, preferably about 30 to 45 °.

  The cutting edge portion 13 is almost entirely hardened by laser hardening, and the cutting edge 13t has the highest hardness. And it approaches the hardness of a preform | base_material as it progresses to the base part 14 side. Moreover, in the blade edge | tip part 13, hardness distribution is substantially equivalent in the both sides of the virtual line X, for example in the right-and-left blade surface 13f.

  Furthermore, the fine blade 10 has a surface that does not have a quenching oxide film by laser quenching over the entire portion including the blade edge portion 13. This is because the fine blade 10 is formed by machining a steel material after laser-quenching the region where the cutting edge portion 13 is to be formed. In other words, the blade edge portion 13 has a laser quenching trace (usually different in color tone from the base material) but does not have a quenching oxide film. The quenching oxide film is an oxide film formed by laser quenching and is a thick oxide film having a thickness exceeding 0.1 μm. If a hardened oxide film is present on the surface, an interference color may be visible, but the interference color cannot be confirmed with the fine blade 10. However, the fine blade 10 may have a natural oxide film having a thickness of 0.1 μm or less.

Next, the manufacturing method of the fine blade 10 provided with the said structure is explained in full detail.
4-7 is a figure for demonstrating the manufacturing method of the fine blade 10. FIG. FIG. 4 is a diagram illustrating a manufacturing process of the fine blade 10, and FIG. 5 is a plan view illustrating a manufacturing intermediate 20 of the fine blade 10. 6 is an enlarged view of a portion B in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line CC in FIG. 5 and shows a state in which the quenching region 21 is cut along the width direction. 4 to 7, dots are given to the quenching region 21, which is a portion hardened by laser quenching, and in FIG. 7, the higher the hardness is, the higher the dot density is, as in FIG. 3.

  As shown in FIG. 4, the manufacturing process of the fine blade 10 includes a step of preparing a steel material, and laser hardening a region wider than a region where the steel blade edge 13 is to be formed to form a quenched region 21 in a part of the steel material. A quenching step (see FIG. 4A), and a machining step (see FIG. 4B) for machining the steel material in which the quenching region 21 is formed to form the blade edge portion 13 in the quenching region 21. Including. In this way, the fine blade 10 in which only the blade edge portion 13 is laser-quenched can be easily and accurately manufactured (see FIG. 4C).

  In addition, a conventionally well-known method is applicable to the process which prepares steel materials. An appropriate steel material can be prepared according to the intended characteristics, shape, size, and the like of the fine blade 10.

  The quenching step is a step of forming a quenching region 21 in a part of a prepared steel material (hereinafter sometimes referred to as a workpiece) using a laser quenching method. The formed quenching region 21 includes a planned formation region of the cutting edge portion 13 of the workpiece and is wider than the planned formation region.

For the quenching process, for example, a laser quenching apparatus including a laser device that outputs laser light, a machining head, and an XY table that fixes a workpiece can be used. Various devices such as a high-power semiconductor laser device (HDDL), a YAG laser device, and a CO ₂ laser device can be applied to the laser device in accordance with the intended quenching state. Laser light output from the laser device is transmitted to the machining head through an optical fiber, for example. Then, the quenching region 21 is formed by moving at least the machining head or the XY table along the planned formation region of the cutting edge portion 13 of the workpiece.

  The quenching step may be performed in an inert gas atmosphere or in a vacuum, or may be performed in an air atmosphere. The latter is preferred from the viewpoint of process cost reduction. When laser quenching is performed in an air atmosphere, a quenched oxide film (not shown) having a thickness exceeding 0.1 μm is formed on the surface of the workpiece. In addition, it is also preferable to selectively quench the portion by applying a laser absorbent in advance to a region including a portion corresponding to the quenching region 21 on the workpiece surface or by masking a region other than the quenching region 21. .

  As shown in FIG. 5, the manufacturing intermediate body 20 in which the hardening area | region 21 corresponding to the shape of the blade edge | tip part 13 was formed in a part of workpiece | work by the hardening process is obtained. On the surface 20 s of the production intermediate 20, a hardened trace that is thicker than the width of the blade edge portion 13 (blade 12) is formed. Hereinafter, the quenching region 21 (quenching trace) appearing on the surface 20 s is referred to as a quenching pattern 22.

  As shown in FIG. 6, three curved portion patterns 22a, 22b, and 22c are formed in the B portion of the surface 20s. The curved portion patterns 22a and 22b are patterns corresponding to the curved portions 12a and 12b of the blade 12, respectively, and are steeper and have a smaller radius of curvature than the curved portion pattern 22c corresponding to the curved portion 12c. In the quenching step, it is preferable to increase the width of the curved portion pattern as the radius of curvature of the curved portion pattern decreases. That is, the width of the curved pattern 22a, 22b is preferably wider than the width of the curved pattern 22c, and in particular, the inner peripheral side of the curved pattern 22a, 22b is preferably expanded. Thereby, even in the curved portion patterns 22a and 22b that are sharply bent, high-precision processing can be easily performed. For example, although it is difficult to process with a steep curved portion, according to this method, the cutting edge 13t can be processed to a target hardness even if there is a slight deviation in quenching or machining.

  As shown in FIG. 7, the quenching region 21 is formed from the surface 20 s of the manufacturing intermediate 20 to a predetermined depth. The depth (predetermined depth) of the quenching region 21 can be changed as appropriate depending on the size, shape, and the like of the blade edge portion 13, but is preferably a depth that allows the entire blade edge portion 13 to be formed. Moreover, the hardening area | region 21 has hardness distribution in the width direction and the depth direction, and the width direction center P of the hardening area | region 21 which is the center of the irradiation spot of a laser beam becomes the maximum hardness normally. Note that the relationship between the width and depth of the quenching region 21 can be adjusted by controlling the output of laser light, the degree of defocusing, and the like.

  The machining step is a step of forming the blade edge portion 13 by machining the workpiece on which the quenching region 21 is formed, that is, the manufacturing intermediate 20. In this embodiment, the board | substrate 11 and the blade 12 which protrudes from the board | substrate surface 11s of this board | substrate 11 are formed by this process. More specifically, as shown by a dotted line in FIG. 7, the manufacturing intermediate 20 is cut or ground to form the cutting edge 13 in the quenching region 21. The apparatus used for machining can be a conventionally known apparatus, and the processing conditions are not particularly limited. Thereby, the blade 12 in which only the blade edge portion 13 has high hardness by laser quenching can be manufactured. At this time, in the manufacturing intermediate 20, the portions formed on the substrate 11 and the root portion 14 are not hardened, so that cutting or the like is easy.

  In the machining process, the manufacturing intermediate 20 can be continuously processed while being attached to the processing table. Alternatively, it may be stored and transported in the state of the production intermediate 20 and machined, for example, at a place different from the quenching place. The former is preferable from the viewpoint of processing accuracy, but the latter may be preferable from the viewpoint of manufacturing cost. In any case, in order to obtain a double-edged blade edge portion 13 having a substantially uniform hardness distribution on each blade surface 13f and a high hardness of the blade edge 13t, a portion close to the surface 20s in the center P in the width direction of the quenching region 21 is formed. It is preferable to machine the blade edge 13t.

  In addition, the design of the fine blade 10, the production intermediate 20, and the production method thereof can be appropriately changed within a range that does not impair the object of the present invention. An example of design change (modified example) is given below.

FIG. 8 shows blades 100 and 101 having a different cross-sectional shape from the blade 12 shown in FIG. In the figure, dots are given to the portions hardened by laser hardening.
In the above, the double-edged blade 12 is illustrated, but the angles α and β may not be substantially equal. For example, as shown in FIG. 8A, the angle β does not have the other blade surface 13f. It may be a single-edged blade 100 that is zero. Further, as shown in FIG. 8B, a two-stage blade 101 having two blade surfaces 102f and 103f on one side may be used. The blade 101 is a double-edged blade, but it may be a single-edged double blade.

FIG. 9 shows a blade 110 having a hardness distribution different from that of the blade 12 shown in FIG. 3 and a manufacturing intermediate 120 thereof. In the figure, dots are attached to a portion hardened by laser hardening, and the density of the dots is increased as the hardness is higher.
As shown in FIG. 9A, the cutting edge portion 111 of the blade 110 is a double-edged blade whose cross-sectional shape is symmetric with respect to the virtual line X, like the cutting edge portion 13. However, in the cutting edge portion 111, the hardness distribution is different on both sides of the virtual line X. In the cross-sectional shape shown in FIG. 9A, the right portion of the imaginary line X has a larger laser-hardened area than the left portion, and the high hardness region is biased to the right portion. That is, the hardness on one side is higher than the hardness on the other side with respect to the virtual line X passing through the blade edge 111t.

  Thus, in the cutting edge part 111 having a cross-sectional shape symmetrical to the virtual line X, the form in which the high hardness region is biased to one side in the width direction of the cutting edge part 111 is as shown in FIG. It is obtained by laser quenching by shifting the center P in the width direction of the quenching region 21 from the portion that becomes the blade edge 111t in the width direction. Further, it is obtained by machining the manufacturing intermediate 120 while shifting the cutting edge 111t in the width direction from the center P in the width direction of the quenching region 21.

<Second Embodiment>
First, the configuration of the pin array 30 will be described in detail with reference to FIG. In the figure, dots are given to the hardened portion (quenched region 41) by laser hardening. Below, the description which overlaps with description of 1st Embodiment is abbreviate | omitted, and it demonstrates in full detail about a difference.

  A pin array 30 shown in FIG. 10 includes a substrate 31 formed by machining a steel material, and pins 32 that are a plurality of needles protruding from the substrate surface 31s. The plurality of pins 32 have the same shape and the same size, and are regularly arranged on the substrate 31. The pin 32 is gradually narrowed from the root portion 34 toward the pin tip portion 33 that is the cut tip portion, and is thinnest at the pin tip 33t that is the tip (cut tip) of the pin tip portion 33. For example, the pin array 30 can be used for forming a plurality of fine through holes in a processing target.

  In the pin 32, only the pin tip portion 33 is laser-hardened, and portions other than the pin tip portion 33 are not laser-hardened. The pin tip portion 33 has a higher hardness than other portions including the root portion 34. In particular, it is preferable that the pin tip 33t has the highest hardness. Thereby, while maintaining the toughness of the root portion 34 and suppressing the breakage of the pin 32, it is possible to improve the drilling characteristics of the processing target by increasing the hardness of the pin tip portion 33. The pin tip portion 33 is a portion that is strongly pressed against the object to be processed and that requires high hardness. In the present embodiment, the pin tip portion 33 has a range of about 5 mm from the pin tip 33 t.

  The pin 32 has rotational symmetry with an imaginary line passing through the pin tip 33t and substantially perpendicular to the substrate surface 31s as the rotation axis. The pin tip portion 33 has substantially the same hardness distribution over the entire circumference of the virtual line at an equal distance from the pin tip 33t. However, the hardness distribution may be different on both sides of the virtual line of the pin tip portion 33 like the blade tip portion 111.

  In addition, the pin array 30 has the surface which does not have the hardening oxide film by laser hardening over the whole including the pin tip part 33 similarly to the fine blade 10. FIG.

Next, a manufacturing method of the pin array 30 having the above configuration will be described in detail.
FIG. 11 is a plan view showing the production intermediate 40. In the figure, dots are given to the portions hardened by laser hardening.

  As in the case of the fine blade 10, the manufacturing process of the pin array 30 includes a step of preparing a workpiece, and a region wider than a region where the pin tip portion 33 of the workpiece is to be formed is laser-quenched to quench a region 41 of the workpiece. And a machining step of forming the pin tip portion 33 in the quenching region 41 by machining the work on which the quenching region 41 is formed.

  As shown in FIG. 11, the manufacturing intermediate body 40 in which the hardening area | region 41 corresponding to the shape of the pin tip part 33 was formed in a part of workpiece | work by the hardening process is obtained. On the surface 40 s of the manufacturing intermediate 40, a plurality of quenching patterns 42 that are quenching marks thicker than the pin tip portion 33 are formed. Each of the plurality of quenching patterns 42 has a substantially circular or elliptical shape, and is formed in the same number as the number of pins 32. However, the quenching pattern 42 for the pin array 30 is not limited to this. For example, the shape of the quenching pattern 42 may be a polygonal shape such as a triangle or a square, and the quenching pattern 42 is increased in size to be smaller than the number of pins 32. It can also be.

  Subsequently, the substrate 31 and a plurality of pins 32 protruding from the substrate surface 31 s of the substrate 31 are formed by machining the manufacturing intermediate 40, and the pin tip portion 33 is formed in the quenching region 41. In order to obtain a pin tip portion 33 having a substantially equal hardness distribution over the entire circumference of the virtual line at an equal distance from the pin tip 33t and having a high hardness of the pin tip 33t, the pin tip 33t is directly below the center of the quenching pattern 42. It is preferable to perform machining so that the portion close to the surface 40s becomes the pin tip 33t.

FIG. 12 shows a pin array 130 which is one modification of the pin array 30.
The pin array 130 has three types of pins 131, 132, and 133 having substantially the same height and different thicknesses. In the pin array 130, the thickest rows of pins 131 are provided at the center in the longitudinal direction of the substrate 31, and among the three types, rows of pins 132 having an intermediate thickness are provided at both ends in the longitudinal direction of the substrate 31. The thinnest rows of pins 133 are provided between the rows of pins 131 and 132, respectively. The shape of the pin is not limited to a conical shape, and may be a cylindrical or prismatic shape, a cylindrical shape thereof, or a shape in which the pin tips are cut obliquely.

  The pin array 130 can be manufactured by machining the manufacturing intermediate 40, for example. In this case, pins are not formed in some of the quenching regions 41. That is, a plurality of types of final products can be manufactured using the same manufacturing intermediate 40. Alternatively, as in the relationship between the pin array 30 and the manufacturing intermediate 40, a manufacturing intermediate having a quenching region corresponding to the number of pins of the pin array 130 may be separately manufactured.

<Third Embodiment>
In FIG. 13, the top view of the manufacturing intermediate body 50 which has the some quenching area | region 51 is shown.
In the manufacturing intermediate 50, the quenching pattern 52 in the quenching region 51 has a ring shape. Although the size and shape of the quenching pattern 52 can be formed substantially the same, a plurality of variations in size and shape may be provided. For example, a plurality of punches 60 can be manufactured by machining the manufacturing intermediate 50. In this case, it is preferable to form the cutting edge 61 of the punch 60 in the quenching region 51. That is, it is possible to produce a plurality of final products (tools having a cutting edge) from one production intermediate.

  A plurality of final products that can be produced from one production intermediate may have the same size, shape, characteristics, etc., as in the punch 60, or may have different sizes. For example, by changing the cutting mode, the cutting edge portion can be formed in various shapes such as a double-edged type, a single-edged type, and a two-stage type. In addition, blades and needles (final products having different characteristics) having an arbitrary hardness distribution such as blades having different hardness distributions on the left and right of the blade edge can be formed.

  10 fine blade, 11, 31 substrate, 11s, 31s substrate surface, 12 blades, 12a, 12b, 12c curved portion, 13 blade edge portion, 13f blade surface, 13t blade edge, 14, 34 root portion, 20, 40 production intermediate, 20s, 40s Surface, 21, 41 Quenched area, 22, 42 Quenched pattern, 22a, 22b, 22c Curved pattern, 30 pin array, 32 pins, 33 pins tip, 33t pins.

Claims (2)

A method for manufacturing a tool having a cutting edge,
Preparing a steel material;
A quenching step of forming a quenching region in a part of the steel material by laser quenching a region wider than the formation planned region of the cut portion of the steel material,
Machining the steel material in which the quenching region is formed, and a machining step for forming the cut portion in the quenching region;
Only including,
In the machining step, the steel material is machined to form a substrate and a blade protruding from the surface of the substrate, and only the blade edge portion of the blade which is the cutting edge portion is formed in the quenching region. Here, a curved portion is included in the planar view shape of the blade viewed from the blade edge side,
In the quenching step, the quenching region including a curved portion pattern corresponding to the curved portion is formed, and the width of the curved portion pattern is increased as the radius of curvature of the curved portion pattern decreases . The manufacturing method according to claim 1 ,
In the machining step, the steel material is machined by shifting a blade edge that is a tip of the blade edge portion from a center of the quenching region.

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