JP2013111179A - Single-edged cutting tool and method for finishing edge body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently restrain a cut from curving with respect to the cutting direction of a single-edged cutting tool 1 in cutting food while avoiding causing an irregular film 9 to be wrongly formed locally.SOLUTION: The angle α of inclination of a cutting edge 5 with respect to the width direction D of a blade 3 is set at 2 to 5 degrees, an irregular film 9 containing a ceramic as a main component is formed in the outer edge portion of the cutting edge 5 by discharge surface treatment, and the opposite side of the irregular film 9 in the cutting edge 3a of the blade 3 is sharpened.

Description

  The present invention relates to a single-edged blade such as a single-edged knife or a single-edged knife, and a blade finishing method for finishing the blade of the single-edged blade.

  In recent years, various developments have been made on techniques relating to knives, and the inventors of the present application have also developed techniques relating to knives, and applications for the techniques have already been published (see Patent Document 1). And the characteristics of the kitchen knife (double-edged knife and single-edged knife) according to the prior art are as follows.

  In the double-edged knife according to the prior art, an uneven film containing ceramics such as titanium carbide as a main component is formed on the outer edge portion of one of the cutting blades by discharge surface treatment. Moreover, in the single blade knife which concerns on a prior art, the film with an unevenness | corrugation is formed in the outer edge part of the opposite surface (opposite surface) of the cutting blade in a blade by discharge surface treatment. Here, a blade attachment process is usually performed on the opposite side of the coating film with the unevenness at the blade edge (blade edge) of the blade.

JP 2008-25116 A

  By the way, in the double-edged knife according to the prior art, when a discharge surface treatment is applied to the blade (the outer edge of one cutting blade) using a discharge electrode having a total shape that matches the shape of the outer edge of the cutting blade. Since the cutting blade has a so-called three-dimensional curved surface (free curved surface), the distance between the discharge electrode of the total shape and the blade (cutting blade) varies, and the formation defect of the uneven film locally occurs. There is a problem. On the other hand, when the surface of the blade is subjected to discharge surface treatment while moving the rod-shaped discharge electrode relative to the blade along the one cutting blade using the rod-shaped discharge electrode, the formation of an uneven film Although defects do not occur locally, there is a problem that the time for forming an uneven film, in other words, the time for finishing the blade becomes long.

  On the other hand, in the single-edged knife according to the prior art, the blade (the cutting edge of the blade in the blade is used) by using a discharge electrode of a total shape that matches the shape of the outer edge of the opposite surface of the blade in the blade. Even if discharge surface treatment is applied to the opposite surface, the outer edge of the blade's opposite surface is a flat two-dimensional plane, so there is no variation in the distance between the discharge electrode and the blade in the overall shape. The formation defect of the film with no occurs locally. However, as shown in FIG. 10, the edge angle (tip angle) of the blade opens only in one direction with respect to the width direction of the blade (expands), and the degree of opening of the blade edge angle (the degree of spread or opening) (Balance) is biased, and when cutting food such as radishes, there is a problem that the cutting direction of the single-edged knife is likely to be bent (cutting of the single-edged knife) (see examples described later).

  In addition, by setting the blade in the single-edged knife according to the prior art to a position where the blade is twisted with respect to the handle, it is possible to reduce the deviation in the degree of opening of the blade edge angle with respect to the handle, Absent.

  Accordingly, an object of the present invention is to provide a single-edged blade or the like having a novel configuration that can solve the above-described problems.

  According to a first aspect of the present invention, there is provided a single-edged blade comprising a blade having a cutting blade only on one side (a knife body) and a handle provided on the blade, the cutting with respect to the width direction of the blade. An inclination angle of the blade is set to 2 to 5 degrees, and an uneven film containing ceramics as a main component is formed on the outer edge portion of the cutting blade by discharge surface treatment, and the unevenness at the blade edge (blade edge) of the blade The gist is that the blade is treated on the opposite side of the coated film.

  Here, the “single-edged knife” includes a single-edged knife, a single-edged knife, and the like.

  According to the first feature, since the inclination angle of the cutting blade of the blade with respect to the width direction of the blade is set to 2 to 5 degrees, the rigidity of the blade edge of the blade is sufficiently secured. The outer edge of the cutting blade can be made into a flat two-dimensional plane before the discharge surface treatment of the blade.

  Since the uneven film is formed on the outer edge of the cutting blade of the blade, and the blade is treated on the opposite side of the uneven film on the blade edge of the blade, The blade edge angle (tip angle) can be opened (expanded) on both sides of the blade width direction with respect to the width direction of the blade to reduce the deviation of the blade edge angle (the degree of spread or the open balance) of the blade. .

  According to a second aspect of the present invention, there is provided a blade finishing method for finishing a blade of a single-edged blade according to the first feature, a movable block having a support surface, the movable block provided on the movable block, and the blade A movable jig provided with a clamper capable of pressing an opposite surface (opposite surface) of the cutting blade, a first fixed block capable of positioning the movable block at a first reference position, and the first fixed block. And a first fixing jig provided with a blade abutting member capable of abutting the blade edge of the blade, and moving the movable block toward the first fixing jig, A first block positioning step for positioning the movable block at the first reference position of the first fixed block, and the cutting blade is supported on the support surface of the movable block after the first block positioning step is completed. In this state, the blade edge of the blade is abutted against the blade abutting member, so that the entire blade edge of the blade protrudes from the outer edge of the support surface of the movable block. Is positioned with respect to the movable block, and then, by pressing the opposite surface of the blade in the blade with the clamper, the cutting blade is parallel to the support surface of the movable block (the An integrated step of integrating the blade with the movable block in a state where the movable block is located on the same plane as the support surface), and a processing table in the discharge surface treatment apparatus after the integration step is completed. A second fixing jig having a second fixing block that is installed and capable of positioning the movable block at a second reference position is used, and the movable block is moved from the first fixing jig side to the first fixing jig. A second block positioning step of moving the movable block to the second reference position of the second fixed block by moving to the fixing jig side, and an outer edge portion of the cutting blade after the second block positioning step Using a discharge electrode of a total shape matched to the shape of the blade, generating a pulsed discharge between the discharge electrode of the total shape and the outer edge of the cutting blade, and the cutting blade of the blade according to the discharge energy A film forming step for forming the uneven film by welding the constituent material of the discharge electrode or a reaction material thereof on the outer edge of the film, and the uneven film on the blade edge of the blade after the film forming process is completed. The gist of the present invention is that a blade cutting process is performed on the opposite side of the blade.

  Here, in the specification and claims of the present application, the “first reference position” refers to a reference position for positioning the movable block on the first fixed block, and “second reference position”. "Means a reference position for positioning the movable block on the second fixed block.

  According to the second feature, in the state where the cutting blade is supported on the support surface of the movable block, by pressing the opposite surface of the blade to the cutting blade, the cutting blade is supported on the movable block. Parallel to the surface, the outer edge of the cutting blade can be made into a flat two-dimensional plane before the discharge surface treatment of the blade.

  Since the uneven film is formed on the outer edge of the cutting blade, and the blade edge of the blade is subjected to a cutting process by polishing on the opposite side of the uneven film, the blade edge angle of the blade is The blade can be opened on both sides with respect to the width direction of the blade, and the deviation in the degree of opening of the blade edge angle of the blade can be reduced.

  According to the present invention, since the outer edge portion of the cutting blade can be made into a flat two-dimensional plane before the discharge surface treatment of the blade, the shape of the outer edge portion of the cutting blade of the blade Even if the surface of the blade (outer edge portion of the cutting blade) is subjected to a discharge surface treatment using a discharge electrode of a total shape adapted to the distance, the distance between the discharge electrode of the total shape and the blade (the cutting blade) There is no variation, and it is possible to avoid local formation of the irregular film.

  In addition, since it is possible to reduce the deviation in the degree of opening of the blade edge angle of the blade, when cutting into food such as radish by the single-edged knife, the cutting with respect to the cutting direction of the single-edged knife (cut of the single-edged knife) It can be suppressed sufficiently.

Fig.1 (a) is a figure which shows the single blade knife which concerns on 1st Embodiment of this invention, FIG.1 (b) is an expanded sectional view along the IB-IB line in Fig.1 (a). FIG. 2 is an enlarged view of the arrow portion II in FIG. FIG. 3 is a view showing a movable jig, a first fixing jig, and a second fixing jig used in the blade finishing method according to the second embodiment of the present invention. FIG. 4 is a diagram illustrating a first positioning step in the blade finishing method according to the second embodiment of the present invention. FIG. 5 is a view for explaining an integration step in the blade finishing method according to the second embodiment of the present invention. FIG. 6 is a diagram for explaining a second positioning step in the blade finishing method according to the second embodiment of the present invention. FIG. 7 is a diagram for explaining a film forming step in the blade finishing method according to the second embodiment of the present invention. FIG. 8 is a diagram for explaining a blade attaching step in the blade finishing method according to the second embodiment of the present invention. FIG. 9A is a diagram illustrating a state in which the test product is cut using the inventive product, and FIG. 9B is a diagram illustrating a state in which the test product is cut using the comparative product. FIG. 10 is a cross-sectional view of a single-edged knife according to the prior art.

(First embodiment)
1st Embodiment of this invention is described with reference to FIG. 1 (a) (b), FIG. 2, and FIG.

  As shown in FIGS. 1 (a) and 1 (b), a single blade knife 1 according to the first embodiment includes a blade (knife body) 3 made of stainless steel having excellent rust resistance. 3 has the cutting blade 5 only on one side (the front side toward the paper surface in FIG. 1A and the right side in FIG. 1B). Further, the blade 3 is provided with a handle 7 made of plastic or plywood. Note that the blade 3 may be made of steel instead of stainless steel, and the position of the cutting blade 5 is set on the reverse side (the reverse side toward the paper surface in FIG. 1 (a), in FIG. 1 (b)). You may change it to the left side).

  Then, the principal part of the single blade knife 1 which concerns on 1st Embodiment is demonstrated.

  As shown in FIG. 2, the inclination angle α of the cutting blade 5 with respect to the width direction D of the blade 3 is set to 2 to 5 degrees. The reason why the inclination angle α of the cutting blade 5 is set to 2 degrees or more is that when it is set to less than 2 degrees, it is difficult to sufficiently secure the rigidity of the blade edge (blade edge) 3a of the blade 3. It is. The inclination angle α of the cutting blade 5 is set to 5 degrees or less. When the inclination angle α is set to exceed 5 degrees, the cutting blade 5 is supported on a support surface of a movable block, which will be described later. This is because even if the opposite surface (opposite surface) of the cutting blade 5 is pressed, it is difficult to make the outer edge portion of the cutting blade 5 a flat two-dimensional plane.

  As shown in FIGS. 1A and 1B, an uneven film 9 is formed on the outer edge portion of the cutting blade 5 of the blade 3 by discharge surface treatment, and the uneven film 9 is made of titanium. One or a mixture of two or more of carbide (TiC), tungsten carbide (WC), and silicon carbide (SiC) is included as a main component. In other words, as shown in FIG. 7, the uneven film 9 uses a discharge electrode 11 having a total shape that matches the shape of the outer edge of the cutting blade 5, and the total shape is obtained in an electrically insulating working fluid. A pulsed discharge is generated between the discharge electrode 11 and the outer edge portion of the cutting blade 5, and the discharge energy of the discharge electrode 11 is formed on the outer edge portion of the cutting blade 5 or the reaction of this constituent material. It is formed by welding materials.

  Here, the discharge electrode 11 of the overall shape is a compact (heat treatment) formed by compression molding one or two or more of powders of titanium carbide, tungsten carbide, and silicon carbide. The titanium carbide powder or the like is coated with a conductive material or mixed with a conductive powder. The discharge electrode 11 is formed by compression molding a silicon (Si) powder or a titanium (Ti) powder, or a solid body of silicon, instead of a compact formed by compression molding titanium carbide powder or the like. In this case, it is necessary to perform discharge surface treatment in an electrically insulating processing oil containing carbon. Further, the overall discharge electrode 11 may be formed of a molded body formed by slurry, injection molding, thermal spraying, or the like, instead of a molded body formed by compression molding titanium carbide powder or the like. .

  As shown in FIGS. 1A and 1B, the width w of the uneven film 9 is 1 mm or more, and is preferably set to 3 to 5 mm. The reason why the width w of the uneven film 9 is set to 1 mm or more is that the number of times that the blade edge 3a of the blade 3 can be sharpened is reduced when it is set to less than 1 mm.

  The surface roughness (arithmetic mean roughness) Ra of the uneven film 9 is 0.8 μm or more, preferably 1.0 μm or more. The surface roughness Ra of the uneven film 9 is set to be 0.8 μm or more. If the surface roughness Ra is set to be less than 0.8 μm, it is difficult to form a saw-like unevenness on the cutting edge of the single-edged knife 1. Because. The discharge conditions for setting the surface roughness Ra of the uneven film 9 to 0.8 μm or more are the same as the discharge conditions described in Patent Document 1.

  On the opposite side of the blade 3 with the uneven coating 9 on the blade edge 3a, a blade attachment process is applied, and the blade attachment angle β of the blade edge 3a of the blade 3 is 8 to 15 degrees, preferably 10 to 13 degrees. Is set to degrees. The reason why the cutting angle β of the cutting edge 3a of the blade 3 is set to 8 degrees or more is that when it is set to less than 8 degrees, it is difficult to sufficiently secure the rigidity of the cutting edge 3a of the cutting blade 5. It is. The reason why the cutting angle β of the blade edge 3a of the blade 3 is set to 15 degrees or less is that when it is set to exceed 15 degrees, it becomes difficult to maintain a good sharpness of the single-edged knife 1. is there.

  Then, the effect | action and effect of 1st Embodiment of this invention are demonstrated.

  Since the uneven film 9 is formed by the discharge surface treatment, the uneven film 9 becomes a mixed structure of stainless steel, which is the base material of the blade 3, and ceramics such as titanium carbide and tungsten carbide. Even if the wear of a coating 9 progresses, only the stainless steel portion of the mixed structure is worn, and the ceramic portion remains, and the blade edge of the single-edged knife 1 (the tip of the uneven coating 9) is sawn. Is played back. Thereby, the state with a good sharpness of the single blade knife 1 can be maintained, reducing the frequency | count of reshaping of the single blade knife 1.

  Since the inclination angle α of the cutting blade 5 with respect to the width direction D of the blade 3 is set to 2 to 5 degrees, the discharge surface treatment of the blade 3 is performed while sufficiently securing the rigidity of the blade tip 3a of the blade 3. Before, the outer edge part of the cutting blade 5 can be made into a flat two-dimensional plane.

  Since a coating film 9 having unevenness is formed on the outer edge portion of the cutting blade 5 and a cutting process is performed on the opposite side of the coating film 9 having unevenness in the cutting edge 3a of the blade 3, the cutting edge angle (tip) of the cutting blade 3 The angle δ is opened (expanded) on both sides (left and right sides in FIG. 2) with respect to the width direction D of the blade 3, and the degree of opening of the blade edge angle δ of the blade 3 (the degree of expansion or the balance of opening) is biased. Can be reduced.

  Therefore, according to the first embodiment of the present invention, since the outer edge portion of the cutting blade 5 can be made into a flat two-dimensional plane before the discharge surface treatment of the blade 3, Even if the discharge surface treatment is performed on the blade 3 (outer edge portion of the cutting blade 5) using the discharge electrode of the total shape matched to the shape, the discharge electrode 11 and the blade 3 (cutting blade 5) of the total shape It is possible to avoid the occurrence of local defects in the formation of the uneven film 9 with no variation in distance.

  Further, since the deviation in the degree of opening of the blade edge angle δ of the blade 3 can be reduced, the cutting with respect to the cutting direction of the single blade knife 1 (cut of the single blade knife 1) is sufficiently suppressed when cutting into food such as radish. be able to.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. 1A and 1B and FIGS. In the drawings, “FF” is the forward direction, “FR” is the backward direction, “L” is the left direction, “R” is the right direction, “U” is the upward direction, and “D” is the upward direction. , Pointing downward.

  The blade finishing method according to the second embodiment of the present invention is a method for finishing the blade 3 (see FIGS. 1A and 1B) of the single-blade knife 1 according to the first embodiment of the present invention. The first block positioning step, the integration step, the second block positioning step, the film forming step, and the blade attaching step are provided. As shown in FIG. 3, in carrying out the blade finishing method according to the second embodiment of the present invention, the movable jig 13, the first fixed jig 15, And the 2nd fixing jig 17 grade | etc., Is used.

  First, before describing the specific contents of each step in the blade finishing method according to the second embodiment of the present invention, the movable jig 13, the first fixing jig 15, and the second fixing jig 17 A specific configuration will be described.

  As shown in FIGS. 3 and 4, the movable jig 13 includes a movable block 19, and the movable block 19 has a support surface 19 f that supports the cutting blade 5. One side edge 19fa of the support surface 19f has a shape (corresponding shape) matched to the outer edge of the cutting blade 5 (the blade edge 3a of the blade 3). The movable block 19 is provided with a plurality of (three in the embodiment of the present invention) clampers 21 capable of pressing the opposite surface (opposite surface) of the cutting blade 5 in the blade 3. .

  The first fixing jig 15 includes a first fixing block 25 that can be installed on an appropriate external table 23, and the first fixing block 25 has a support surface 25 f that supports the movable block 19. Further, the first fixed block 25 is provided with a butting plate 27 and a pair of butting plates 29 as movable block abutting members. The movable block 19 can be abutted to position the first fixed block 25 at the first reference position (position of the movable block 19 shown in FIG. 4). In other words, the first fixed block 25 can position the movable block 19 at the first reference position of the first fixed block 25. Here, the abutting plate 27 regulates the position of the movable block 19 in the front-rear direction with respect to the first fixed block 25, and the pair of abutting plates 29 are the left and right of the movable block 19 with respect to the first fixed block 25. The position of the direction is regulated.

  As shown in FIGS. 3 and 5, the first fixing block 25 is provided with a butting plate 31 and a pair of butting pins 33 as a knife body abutting member. The abutting pins 33 are used to position the blade 3 with respect to the movable block 19 in a state where the blade edge 3a of the blade 3 protrudes from the one side edge 19fa of the support surface 19f of the movable block 19, respectively. The blade edge 3a can be abutted. Here, the abutting plate 31 regulates the position of the blade 3 in the front-rear direction relative to the movable block 19, and the pair of abutting pins 33 determines the position of the blade 3 in the front-rear direction relative to the movable block 19. It is something to regulate.

  As shown in FIGS. 3 and 6, the second fixing jig 17 includes a second fixing block 37 that can be set on the processing table 35 in the discharge surface treatment apparatus. The second fixing block 37 is a movable block. A U-shaped support surface 37 f that supports the support 19 is provided. The second fixed block 37 is provided with a plurality of abutting plates (abutting 39 and a pair of abutting plates 41) as the second abutting member for the movable block. Each of the plates 41 can abut the movable block 19 to position the second fixed block 37 at the second reference position (position of the movable block 19 shown in FIG. 6). In other words, the second fixed block 37 can position the movable block 19 at the second reference position of the second fixed block 37. Here, the abutting plate 39 regulates the position of the movable block 19 in the front-rear direction with respect to the second fixed block 37, and the pair of abutting plates 41 are the left and right sides of the movable block 19 with respect to the second fixed block 37. The position of the direction is regulated.

  Then, the specific content of each process in the finishing method of the blade which concerns on 2nd Embodiment of this invention is demonstrated.

First Block Positioning Step As shown in FIG. 4, the movable block 19 is moved to the first fixing jig 15 side and abutted against a plurality of abutting plates 27 and 29 as first abutting members for the movable block. Thus, the movable block 19 is positioned at the first reference position of the first fixed block 25 with the support surface 19f of the movable block 19 facing upward.

Integration Step After the end of the first block positioning step, as shown in FIG. 5, the cutting blade 5 is supported on the support surface 19f of the movable block 19, and the cutting edge 3a of the blade 3 is used as a blade body abutting member. The blade 3 is moved to the movable block in a state where the entire blade edge 3a of the blade 3 is projected from the one side edge 19fa of the support surface 19f of the movable block 19 by abutting against the abutting plate 31 and the pair of abutting pins 33. 19 can be positioned. Subsequently, the surface of the blade 3 opposite to the cutting blade 5 is pressed by the plurality of clampers 21 to make the cutting blade 5 parallel to the support surface 19f of the movable block 19 (in other words, support of the movable block 19). The blade 3 is integrated with the movable block 19 in a state where it is positioned on the same plane as the surface 19f.

Second Block Positioning Step After the integration step is completed, the movable block 19 is moved from the first fixed jig 15 side to the second fixed jig 17 side as shown in FIG. The movable block 19 is positioned at the second reference position of the second fixed block 37 with the support surface 19f of the movable block 19 facing downward by abutting against a plurality of abutting plates 39 and 41 as members. Note that after the movable block 19 is positioned at the second reference position of the second fixed block 37, the movable block 19 may be fixed to the second fixed block 37 by appropriate fixing means such as a clamper.

Film formation process (discharge process)
After the end of the second block positioning step, as shown in FIG. 7, the discharge electrode 11 having a total shape matched to the shape of the outer edge portion of the cutting blade 5 is used, and the outer discharge electrode 11 and the outer edge portion of the cutting blade 5 are In a state of being opposed to each other, a pulsed discharge is generated between the discharge electrode 11 of the total shape and the outer edge portion of the cutting blade 5. Thereby, the constituent material of the discharge electrode 11 or its reactive substance can be welded to the outer edge part of the cutting blade 5 by the discharge energy, and the uneven film 9 can be formed.

Blade finishing step After the film forming step is finished, as shown in FIG. 8, a rotating grindstone 43 is used, and the rotating grindstone 43 is rotated around its axis while being relatively close to the blade 3. It is made to contact the other side of the film 9 with the unevenness | corrugation in the blade edge | tip 3a of the body 3. FIG. As a result, it is possible to apply a cutting process to the opposite side of the uneven film 9 on the blade edge 3a of the blade 3 by polishing.

  Thus, the finishing of the blade 3 in the single blade knife 1 is completed.

  Then, the effect | action and effect of 2nd Embodiment of this invention are demonstrated.

  With the cutting blade 5 supported on the support surface 19f of the movable block 19, by pressing the opposite surface of the blade 3 to the cutting blade 5, the cutting blade 5 is made parallel to the support surface 19f of the movable block 19, Before the discharge surface treatment of the blade 3, the outer edge portion of the cutting blade 5 can be made into a flat two-dimensional plane.

  Since the coating film 9 having unevenness is formed on the outer edge portion of the cutting blade 5 and the cutting edge processing of the blade 3 is performed by polishing on the opposite side of the coating film 9 having the unevenness in the cutting edge 3 a of the blade 3, the edge angle of the blade 3 By opening δ on both sides with respect to the width direction D of the blade 3, the deviation in the degree of opening of the blade edge angle δ of the blade 3 can be reduced.

  Therefore, also in the second embodiment of the present invention, the same effects as in the first embodiment of the present invention are exhibited.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect. Further, the scope of rights encompassed by the present invention is not limited to the embodiments of the present invention.

  An embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b).

  The single-edged knife 1 according to the embodiment of the present invention is made as an invention, and the single-edged knife according to the prior art is prototyped as a comparative product. Subsequently, when the test product made of urethane is cut using the invention product and the comparative product, results are obtained as shown in FIGS. 9 (a) and 9 (b). That is, it was confirmed that the cutting with respect to the cutting direction was sufficiently suppressed when the test product was cut with the inventive product as compared with the case where the test product was cut with the comparative product.

α Inclination angle of cutting blade β Cutting angle of blade δ Blade edge angle 1 Single blade knife 3 Blade 3a Cutting edge 5 Cutting blade 7 Handle 9 Uneven coating 11 Total discharge electrode 13 Movable jig 15 First fixing jig 17 Second fixing jig 19 Movable block 19f Support surface 21 Clamper 25 First fixed block 25f Support surface 27 Abutting plate (first abutting member for movable block)
29 Abutting plate (first abutting member for movable block)
31 Abutting plate (abutting member for the knife body)
33 Abutting pin (abutting member for the knife body)
35 processing table 37 second fixed block 37f support surface 39 abutting plate (second abutting member for movable block)
41 Abutting plate (second abutting member for movable block)
43 Rotating whetstone

Claims (5)

In a single-edged blade comprising a blade having a cutting blade only on one side, and a handle provided on the blade,
An angle of inclination of the cutting blade with respect to the width direction of the blade is set to 2 to 5 degrees, and an uneven film containing ceramics as a main component is formed on the outer edge portion of the cutting blade by discharge surface treatment. A single-edged blade, characterized in that a cutting process is applied to the opposite side of the uneven film at the blade tip.   The single-edged blade according to claim 1, wherein a cutting angle of the blade edge of the blade is set to 8 to 15 degrees.   The single-edged cutter according to claim 1 or 2, wherein a surface roughness of the uneven film is set to 0.8 µm or more.   The ceramics according to any one of claims 1 to 3, wherein the ceramic is one or a mixture of two or more of titanium carbide, tungsten carbide, and silicon carbide. Single-edged knife. In the blade finishing method for finishing the blade in the single-edged blade according to claim 1,
A movable jig comprising a movable block having a support surface, a clamper provided on the movable block and capable of pressing the opposite surface of the blade to the cutting blade, and positioning the movable block at a first reference position Using a first fixing jig comprising a first fixing block capable of cutting and a blade abutting member provided on the first fixing block and capable of abutting against the cutting edge of the blade. A first block positioning step of moving to the first fixing jig side and positioning the movable block at the first reference position of the first fixing block;
After completion of the first block positioning step, the cutting blade is supported on the support surface of the movable block, and the blade edge of the blade is abutted against the blade abutting member. With the entire blade edge protruding from the outer edge of the support surface of the movable block, the blade is positioned with respect to the movable block, and subsequently, the clamper causes the opposite surface of the blade to the cutting blade. An integration step of integrating the blade with the movable block in a state where the cutting blade is parallel to the support surface of the movable block by pressing;
After completion of the integration step, a second fixing jig provided with a second fixing block installed on a processing table in the discharge surface treatment apparatus and capable of positioning the movable block at a second reference position is used. A second block positioning step in which the movable block is moved from the first fixed jig side to the second fixed jig side to position the movable block at the second reference position of the second fixed block;
After completion of the second block positioning step, a discharge electrode having a total shape matching the shape of the outer edge portion of the cutting blade is used, and a pulsed discharge is generated between the discharge electrode of the total shape and the outer edge portion of the cutting blade. A film forming step of forming the uneven film by welding the constituent material of the discharge electrode or a reactive substance thereof to the outer edge of the cutting blade of the blade by the discharge energy;
A blade finishing method comprising: a blade attaching step of performing polishing by polishing on the opposite side of the uneven film on the blade edge of the blade after the coating formation step.