JP2012251198A - Implement set for discharge surface treatment, discharge surface treatment method, and edged tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate local defective forming of a film 9, and to omit relative positional correction of a discharge electrode 27 with respect to a kitchen knife body 3.SOLUTION: A movable block 39 is positioned at a first reference position of a first fixed block 45 while a supporting face 39f of the movable block 39 is faced upward. A kitchen knife body 3 is positioned with respect to the movable block 39 while the entire blade edge 7 of the kitchen knife body 3 is projected from one side edge 39fa of the supporting face 39f of the movable block 39. The kitchen knife body 3 is integrated with the movable block 39. The movable block 39 is positioned to the second reference position of a second fixing block 55 while the supporting face 39f of the movable block 39 is faced downward.

Description

  The present invention relates to a discharge surface treatment jig set and the like used when forming a film on the edge of one edge of a blade body in a blade by using a discharge surface treatment apparatus.

  In general, a kitchen knife (an example of a blade) includes a knife body as a blade body and a handle provided integrally with the knife body. Further, the inventor of the present application has already developed a kitchen knife that can maintain a good sharpness (see Patent Document 1). In the kitchen knife according to this prior art, the discharge of the discharge surface treatment apparatus is performed. Using energy, one or a mixture of two or more of titanium carbide (TiC), tungsten carbide (WC), and silicon carbide (SiC) is mainly applied to the edge of the cutting edge on one side (back side) of the kitchen knife body. A coating film is formed as a component.

  When the coating is formed on the edge of the blade edge on one side of the knife body by the discharge surface treatment apparatus, a fixing jig (attachment jig) that can be installed on the treatment table in the discharge surface treatment apparatus is usually used. The fixing jig includes a fixing block having a support surface for supporting the other surface (front surface) of the kitchen knife body, a knife block provided on the fixing block and for positioning the kitchen knife body with respect to the fixing block. A plurality of abutting members that can abut the back portion, and a clamper that is provided on the fixed block and presses the vicinity of the edge of the blade edge on one side of the knife body. And the discharge surface treatment with respect to the edge part of the blade edge | tip of the one side of a kitchen knife main body is normally performed as follows.

  The other surface of the kitchen knife body is supported by the support surface of the fixed block, and the back of the kitchen knife body is abutted against the abutting member, thereby positioning the kitchen knife body with respect to the stationary block. Next, the knife body is fixed (integrated) to the fixed block by pressing the vicinity of the edge of the blade edge on one side of the knife body with the clamper. Then, a pulsed discharge is generated between the discharge electrode and the edge of the knife edge on one side of the knife body with the discharge electrode and the edge of the knife edge of the knife body facing each other in the discharge surface treatment apparatus. Let Thereby, the constituent material of a discharge electrode or its reactive substance can be welded to the edge part of the blade edge | tip of the one side of a knife body with the discharge energy, and a film can be formed.

JP 2008-264116 A

  By the way, during the manufacture of the kitchen knife body, minute undulations (unevenness) may occur along the edge of the blade edge of the kitchen knife body. In such a case, the discharge electrode feed amount is smaller than the maximum undulation amount (maximum unevenness amount) of the knife body, and the discharge surface treatment device coats the edge of the knife edge on one side of the knife body. However, there is a problem that local film formation defects (coating defects) occur and the quality of the film, in other words, the quality of the discharge surface treatment is deteriorated.

  In addition, since the knife body is positioned with respect to the fixed block by abutting the back of the knife body against the abutting member, if the shape of the knife body varies, the position of the blade edge of the knife body relative to the fixture Changes and is no longer constant. In such a case, it is necessary to correct the relative position of the discharge electrode with respect to the knife body, and there is a problem that the work of the discharge surface treatment becomes complicated.

  Accordingly, an object of the present invention is to provide a discharge surface treatment jig set, a discharge surface treatment method, and the like having a novel configuration that can solve the above-described problems.

  The first feature of the present invention is that when a coating (hard coating) is formed on the edge of the blade edge on one side (back side) of the blade body in the blade by the discharge surface treatment device (discharge surface treatment by the discharge surface treatment device). In the discharge surface treatment jig set to be used, a movable block having a support surface for supporting one surface (back surface) of the blade body, and the other side (front side) of the blade body provided on the movable block. A movable jig provided with a clamper that presses the vicinity of the edge of the blade edge, a first fixed block capable of positioning the movable block at a first reference position with the support surface of the movable block facing upward, and the The blade body is positioned with respect to the movable block in a state provided on the first fixed block and the entire cutting edge of the blade body protrudes from one side edge of the support surface of the movable block. A first fixing jig provided with a blade body abutting member capable of abutting the blade edge of the blade body to perform the test, and a treatment table in the discharge surface treatment apparatus, The gist of the invention is that it includes a second fixing jig including a second fixing block capable of positioning the movable block at the second reference position with the support surface facing downward.

  Here, in the specification and claims of the present application, the “blade” means a knife, a knife, scissors and the like. The “first reference position” refers to a reference position for positioning the movable block on the first fixed block, and the “second reference position” refers to the second fixed position. A reference position for positioning on a block.

  The second feature of the present invention is the use of the discharge surface treatment jig set according to the first feature of the present invention, and the cutting edge on one side (back side) of the blade body in the blade by the discharge surface treatment by the discharge surface treatment apparatus. In the discharge surface treatment method for forming a film (hard film) on an edge, the movable block is moved to the first fixed jig side, and the support surface of the movable block is faced upward. A first block positioning step for positioning the blade main body at the first reference position (the first reference position of the first fixed block), and after the first block positioning step, the one side surface of the blade body is moved to the movable position. The entire blade edge of the blade body is moved in front of the movable block by supporting the blade edge of the blade body against the blade body abutting member by supporting the block on the support surface. The blade body is positioned with respect to the movable block in a state of protruding from one side edge of the support surface, and then, the clamper presses the vicinity of the edge of the blade edge on the other side (front side) of the blade body. Thus, after the integration step of integrating the blade body with the movable block and the integration step, the movable block is moved from the first fixed jig side to the second fixed jig side. A second block positioning step of positioning the movable block at the second reference position (the second reference position of the second fixed block) with the support surface of the movable block facing downward; After completion of the block positioning step, the discharge electrode and the blade body are arranged in a state where the discharge electrode in the discharge surface treatment apparatus faces the edge of the blade edge on one side of the blade body. A pulse-shaped discharge is generated between the edge of the blade edge on the side, and the constituent material of the discharge electrode or the reactant thereof is welded to the edge of the blade edge on the one side of the blade body by the discharge energy. The gist of the present invention is to provide film formation (discharge process) for forming a film.

  According to the first feature or the second feature, the movable block has the support surface that supports the surface on one side of the blade body, and the movable block is near the edge of the blade edge on the other side of the blade body. As described above, the one surface of the blade body is supported on the support surface of the movable block, and the blade edge of the blade body on the other side of the blade body is supported by the clamper. The vicinity of the edge can be pressed. Thereby, during the manufacturing process of the blade body, even if a minute undulation (unevenness) occurs along the edge direction of the edge of the blade body, the edge of the blade body on one side of the blade body Before forming the coating, the edge of the blade edge on one side of the blade body can be corrected (corrected) to a flat surface by pressing the plurality of clampers.

  The movable block is provided with the clamper, the first fixed block is provided with the blade body abutting member capable of abutting the blade edge of the blade body, and the movable block is disposed on the second fixed block. Since it can be positioned at the second reference position, as described above, with the entire cutting edge of the blade body protruding from one side edge of the support surface of the movable block, the blade body is moved with respect to the movable block. The blade main body is integrated with the movable block, and the movable block can be positioned at the second reference position of the second fixed block. Thereby, even if the shape of the blade body varies, the position of the blade edge of the blade body relative to the second fixing jig does not change.

  According to the present invention, during the manufacturing process of the blade body, even if the minute undulation is generated along the blade edge direction at the edge of the blade body, the blade edge on one side of the blade body is caused by discharge energy. Before forming the coating on the edge of the blade, the edge of the blade edge on one side of the blade body can be corrected to a flat surface by pressing the plurality of clampers. ), The quality of the coating film, in other words, the quality of the discharge surface treatment can be improved.

  In addition, even if there is variation in the shape of the blade body, the position of the blade edge of the blade body relative to the second fixing jig does not change, so that the relative position correction of the discharge electrode with respect to the knife body can be performed. It becomes unnecessary and the efficiency of the discharge surface treatment can be increased.

FIG. 1 is a view showing a discharge surface treatment jig set according to an embodiment of the present invention. FIG. 2 is a diagram for explaining a part of the first positioning step in the discharge surface treatment method according to the embodiment of the present invention and the discharge surface treatment jig set according to the embodiment of the present invention. It is the figure which looked at a tool and a movable jig from the top. FIG. 3 is a diagram for explaining a part of the integration step in the discharge surface treatment method according to the embodiment of the present invention and the jig set for discharge surface treatment according to the embodiment of the present invention. It is the figure which looked at the movable jig etc. from the top. FIG. 4 is a diagram for explaining a part of the second positioning step in the discharge surface treatment method according to the embodiment of the present invention and the discharge surface treatment jig set according to the embodiment of the present invention. It is the figure which looked at a tool, a movable jig, etc. from the top. FIG. 5 is a diagram for explaining a film forming step in the discharge surface treatment method according to the embodiment of the present invention and a discharge surface treatment apparatus according to the embodiment of the present invention. Fig.6 (a) is a figure which shows the knife of the single blade type which concerns on embodiment of this invention, FIG.6 (b) is an expanded sectional view along VIB-VIB in Fig.6 (a).

  Single-edged knife according to an embodiment of the present invention, discharge surface treatment apparatus according to an embodiment of the present invention, a jig set for discharge surface treatment according to an embodiment of the present invention, and a discharge surface treatment according to an embodiment of the present invention The method and the like will be sequentially described with reference to the drawings. 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.

[Single-edged knife according to an embodiment of the present invention]
As shown in FIGS. 6 (a) and 6 (b), the single-edged knife 1 according to the embodiment of the present invention is a treatment target of the discharge surface treatment method according to the embodiment of the present invention, and has excellent rust resistance. A knife body (blade) 3 as a knife body made of stainless steel is provided, and this knife body 3 has a cutting blade 5 only on the front side. In addition, a coating (hard coating) 9 is formed on the edge of the blade edge (the cutting edge of the cutting blade 5) 7 on the back side (one side) of the knife body 3, and this coating 9 is made of titanium carbide (TiC), It contains any one or a mixture of two or more of tungsten carbide (WC) and silicon carbide (SiC) as a main component. Furthermore, the knife body 3 is provided with a handle 11 made of plastic or plywood. Note that the knife body 3 may be made of steel instead of stainless steel.

[Discharge surface treatment apparatus according to an embodiment of the present invention]
As shown in FIG. 5, the discharge surface treatment apparatus 13 according to the embodiment of the present invention is an apparatus used for carrying out the discharge surface treatment method according to the embodiment of the present invention, and extends in the front-rear direction and the left-right direction. A bed 15 is provided, and the bed 15 is provided with a column 17 extending in the vertical direction. The bed 15 is provided with a movable frame (movable table) 19, which can be moved in the front-rear direction by driving a first servo motor (not shown), and has a second servo. It can be moved in the left-right direction by driving a motor (not shown).

  The movable frame 19 is provided with a processing tank 21 capable of storing an electrically insulating processing fluid (processing oil) S. A processing table 23 is provided in the processing tank 21 and can be moved in the front-rear direction and the left-right direction integrally with the movable frame 19 by driving the first servo motor and the second servo motor.

  The column 17 is provided with a processing head 25, and the processing head 25 is movable in the vertical direction by driving a third servo motor (not shown). The processing head 25 is provided with an electrode holder 29 that is held by the discharge electrode 27. The electrode holder 29 can be moved up and down integrally with the processing head 25 by driving a third servo motor. Here, the discharge electrode 27 is a compact formed by compression molding one or a mixture of two or more of titanium carbide powder, tungsten carbide powder, and silicon carbide powder (molded by heat treatment). The titanium carbide powder or the like is coated with a conductive material or mixed with a conductive powder. Further, the discharge electrode 27 has a shape corresponding to the edge of the blade edge 7 on the back side of the knife 1.

  The discharge electrode 27 may be a compact formed by compression molding silicon (Si) powder or titanium (Ti) powder, or a solid body of silicon, instead of a compact formed by compressing titanium carbide powder or the like. In this case, it is necessary to perform a discharge surface treatment in the electrically insulating working fluid S containing carbon (C). The discharge electrode 27 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.

[Discharge surface treatment jig set according to an embodiment of the present invention]
As shown in FIG. 1, the discharge surface treatment jig set 31 according to the embodiment of the present invention uses the discharge energy of the discharge surface treatment device 13 (see FIG. 5) on the back side of the knife body 3 in the knife 1. It is used when forming the coating 9 (see FIG. 5) on the edge of the blade edge 7, and includes a movable jig 33, a first fixing jig 35, and a second fixing jig 37. And the concrete structure of each jig | tool 33,35,37 in the jig | tool set 31 for discharge surface treatment is as follows.

  As shown in FIGS. 1 and 2, the movable jig 33 includes a movable block 39, and the movable block 39 has a support surface 39 f that supports the back surface (one surface) of the kitchen knife body 3. The one side edge 39fa of the support surface 39f of the movable block 39 has a shape corresponding to the cutting edge 7 of the knife body 3. The movable block 39 is provided with a plurality of (three in the embodiment of the present invention) clampers 41 that press the vicinity of the edge of the cutting edge 7 on the front side (the other side) of the knife body 3.

  The first fixing jig 35 can be installed on an external table 43 disposed outside the discharge surface treatment apparatus 13, and includes a first fixing block 45. The first fixing block 45 is a movable block 39. The support surface 45f for supporting the movable block 39 with the support surface 39f facing upward is provided. Further, the first fixed block 45 is provided with an abutting plate 47 and a pair of abutting plates 49 as movable block abutting members, and the abutting plate 47 and the pair of abutting plates 49 are respectively movable. The movable block 39 can be abutted to be positioned at the first reference position (position of the movable block 39 shown in FIG. 2) of the first fixed block 45 with the support surface 39f of the block 39 facing upward. In other words, the first fixed block 45 can position the movable block 39 at the first reference position of the first fixed block 45 with the support surface 39f of the movable block 39 facing upward. Here, the abutting plate 47 regulates the position of the movable block 39 in the front-rear direction with respect to the first fixed block 45, and the pair of abutting plates 49 are the left and right of the movable block 39 relative to the first fixed block 45. The position of the direction is regulated.

  The first fixed block 45 is provided with an abutment plate 51 and a pair of abutment pins 53 as an abutment member for the kitchen knife body, and the abutment plate 51 and the pair of abutment pins 53 are respectively a knife body 3. The blade edge 7 of the knife body 3 can be abutted to position the knife body 3 with respect to the movable block 39 in a state where the blade edge 7 protrudes from the one side edge 39fa of the movable block support surface 39f. Here, the abutment plate 51 regulates the position in the front-rear direction with respect to the movable block 39, and the pair of abutment pins 53 regulates the position in the front-rear direction with respect to the movable block 39.

  The second fixing jig 37 can be installed on the processing table 23 and includes a second fixing block 55. The second fixing block 55 is movable with the support surface 39f of the movable block 39 facing downward. A U-shaped support surface 55 f that supports the block 39 is provided. The second fixed block 55 is provided with a plurality of abutting plates (abutting 57 and a pair of abutting plates 59) as the second abutting member for the movable block. The plates 59 respectively push the movable block 39 in order to position it at the second reference position (position of the movable block 39 shown in FIG. 3) of the second fixed block 55 with the support surface 39f of the movable block 39 facing downward. It is possible to guess. In other words, the second fixed block 55 can position the movable block 39 at the second reference position of the second fixed block 55 with the support surface 39f of the movable block 39 facing downward. Here, the abutting plate 57 regulates the position of the movable block 39 in the front-rear direction with respect to the second fixed block 55, and the pair of abutting plates 59 is the left and right of the movable block 39 relative to the second fixed block 55. The position of the direction is regulated.

[Discharge Surface Treatment Method According to Embodiment of the Present Invention]
The discharge surface treatment method according to the embodiment of the present invention uses the discharge surface treatment jig set 31 and the discharge surface treatment device 13 (discharge surface treatment by the discharge surface treatment device 13) on the back side of the knife body 3 in the knife 1. This is a method for forming a coating (hard coating) 9 on the edge of the blade edge 7, and includes a first block positioning step, an integration step, a second block positioning step, and a coating forming step. And the concrete content of each process in the discharge surface treatment method which concerns on embodiment of this invention is as follows.

First block positioning step The movable block 39 is moved to the first fixing jig 35 side and supported by a plurality of abutting plates 47 and 49 as first abutting members for the movable block, thereby supporting the movable block 39. The movable block 39 is positioned at the first reference position of the first fixed block 45 with the surface 39f facing upward.

Integration Step After the first block positioning step is finished, the back surface of the knife body 3 is supported on the support surface 39f of the movable block 39, and the cutting edge 7 of the knife body 3 is used as an abutting member 51 as a blade body abutting member. The knife body 3 is positioned with respect to the movable block 39 in a state where the entire cutting edge 7 of the knife body 3 protrudes from the one side edge 39fa of the support surface 39f of the movable block 39 by abutting against the pair of abutting pins 53. can do. Subsequently, the knife body 3 is integrated with the movable block 39 by pressing the vicinity of the edge of the cutting edge 7 on the front side of the knife body 3 with a plurality of clampers 41.

Second block positioning step After completion of the integration step, the movable block 39 is moved from the first fixed jig 35 side to the second fixed jig 37 side, and a plurality of abutments as second abutment members for the movable block By abutting against the plates 57 and 59, the movable block 39 is positioned at the second reference position of the second fixed block 55 with the support surface 39f of the movable block 39 facing downward. Note that after the movable block 39 is positioned at the second reference position of the second fixed block 55, the movable block 39 may be fixed to the second fixed block 55 by appropriate fixing means such as a clamper.

Film formation process (discharge process)
After completion of the second block positioning step, the discharge table 27 and the knife body 3 are moved by moving the processing table 23 in the front-rear direction and the left-right direction integrally with the movable frame 19 by driving the first servo motor and the second servo motor. The edge part of the blade edge | tip 7 of the back side is faced. In addition, an appropriate amount of the processing liquid S is stored in the processing tank 21. Then, a pulsed discharge is generated between the discharge electrode 27 and the edge of the blade edge 7 on the back side of the knife body 3 while the electrode holder 29 is moved downward integrally with the processing head 25 by driving the third servo motor. Is generated. Thereby, the constituent material of the discharge electrode 27 or its reactive substance can be welded to the edge part of the blade edge 7 on the back side of the knife body 3 by the discharge energy to form the coating (hard coating) 9.

  Instead of using the discharge electrode 27 having a shape corresponding to the edge of the cutting edge 7 on the back side of the knife body 3, a rod-shaped discharge electrode (not shown) may be used. It is necessary to move the discharge electrode relative to the knife body 3 in the direction of the cutting edge of the knife body 3. In addition, when generating a pulsed discharge between the discharge electrode 27 and the edge of the cutting edge 7 on the back side of the knife body 3, instead of moving the electrode holder 29 integrally with the processing head 25, The electrode holder 29 may be moved in the left direction integrally with the processing head 25.

  Thus, the discharge surface treatment for the edge portion of the blade edge 7 on the back side of the knife body 3 is completed.

[Operation and Effect of Embodiment of the Present Invention]
Since the movable block 39 has a support surface 39f that supports the back surface of the kitchen knife body 3, and the movable block 39 is provided with a plurality of clampers 41 that press the vicinity of the edge of the cutting edge 7 on the front side of the kitchen knife body 3, As described above, the back surface of the knife body 3 is supported by the support surface 39 f of the movable block 39, and the vicinity of the edge of the cutting edge 7 on the front side of the knife body 3 can be pressed by the plurality of clampers 41. Thereby, during the manufacturing process of the kitchen knife body 3, even if minute undulations (unevenness) occur along the edge direction of the blade edge 7 of the kitchen knife body 3, the cutting edge 7 on the back side of the kitchen knife body 3 by the discharge energy. Before the coating 9 is formed on the edge of the knife, the edge of the blade edge 7 on the back side of the knife body 3 can be corrected (corrected) to a flat surface by pressing the plurality of clampers 41.

  In addition, a plurality of clampers 41 are provided in the movable block 39, and a butting plate 51 and a pair of butting pins 53 as a blade body abutting member capable of abutting the blade edge 7 of the knife body 3 on the first fixed block 45. Since the movable block 39 can be positioned at the second reference position of the second fixed block 55, the entire cutting edge 7 of the knife body 3 is placed on the one side edge 39fa of the support surface 39f of the movable block 39 as described above. The knife main body 3 is positioned with respect to the movable block 39 in a state of protruding from the movable block 39, the knife main body 3 is integrated with the movable block 39, and the movable block 39 is positioned at the second reference position of the second fixed block 55. be able to. Thereby, even if the shape of the knife body 3 varies, the position of the blade edge 7 of the knife body 3 with respect to the second fixing jig 37 (second fixing block 55) does not change.

  Therefore, according to the embodiment of the present invention, during the manufacturing process of the knife body 3, even if a minute undulation is generated along the edge direction of the edge 7 of the knife body 3, the knife body 3 is discharged by the discharge energy. Before the coating 9 is formed on the edge of the blade edge 7 on the back side of the knife, the edge of the blade edge 7 on the back side of the knife body 3 can be corrected to a flat surface by pressing a plurality of clampers 41. It is possible to eliminate the formation failure (coating failure) and improve the quality of the coating film 9, in other words, the quality of the discharge surface treatment.

  Further, even if the shape of the knife body 3 varies, the position of the blade edge 7 of the knife body 3 with respect to the second fixing jig 37 does not change, so that the relative position of the discharge electrode 27 relative to the knife body 3 is corrected. Can be eliminated, and the efficiency of the discharge surface treatment can be improved.

  The present invention is not limited to the description of the above-described embodiment. For example, instead of the knife body 3 in the single-blade type knife 1, the discharge surface treatment is applied to the knife body (not shown) in the double-blade type knife. In addition, the present invention can be implemented in various other modes. Further, the scope of rights encompassed by the present invention extends to the knife such as the kitchen knife 1 having the coating 9 formed on the back edge of the kitchen knife body 3, and is not limited to the embodiment of the present invention. .

1 kitchen knife 3 kitchen knife body 5 cutting edge 7 cutting edge 9 coating (hard coating)
11 Handle 13 Discharge surface treatment device 19 Movable frame 21 Processing tank 23 Processing table 25 Processing head 27 Discharge electrode 29 Electrode holder 31 Discharge surface treatment jig set 33 Movable jig 35 First fixing jig 37 Second fixing jig 39 Movable block 39f Movable block support surface 39fa One side edge 41 of the movable block support surface Clamper 43 External table 45 First fixed block 45f First fixed block support surface 47 Abutting plate (first abutting member for movable block)
49 Abutting plate (first abutting member for movable block)
51 Abutting plate (abutting member for the knife body)
53 pin (abutment member for the knife body)
55 Second fixed block 55f Support surface 57 of second fixed block Abutting plate (second abutting member for movable block)
59 Abutting plate (second abutting member for movable block)

Claims (4)

In the discharge surface treatment jig set used when forming a film on the edge of the blade edge on one side of the blade body in the blade by the discharge surface treatment device,
A movable block having a support surface that supports a surface on one side of the cutter body, and a movable jig provided with the clamper that is provided on the movable block and presses the vicinity of the edge of the blade edge on the other side of the cutter body; ,
A first fixed block capable of positioning the movable block at a first reference position with the support surface of the movable block facing upward; and the movable block provided on the first fixed block and the entire cutting edge of the cutter body. A first fixed body comprising a blade body abutting member capable of abutting the blade edge of the blade body to position the blade body relative to the movable block in a state of projecting from one side edge of the support surface. A jig,
A second fixed block having a second fixed block which can be installed on a processing table in the discharge surface treatment apparatus and which can position the movable block at a second reference position with the support surface of the movable block facing down; And a jig set for discharge surface treatment. The first fixing jig is provided on the first fixed block and abuts the movable block to position the movable block at the first reference position with the support surface of the movable block facing upward. A movable block first abutting member,
The second fixing jig is provided on the second fixed block and abuts the movable block to position the movable block at the second reference position with the support surface of the movable block facing downward. The discharge surface treatment jig set according to claim 1, further comprising a movable block second abutting member. In the discharge surface treatment method for forming a film on the edge portion of the blade edge on one side of the blade body in the blade using the discharge surface treatment jig set according to claim 1,
A first block positioning step of positioning the movable block at the first reference position in a state in which the movable block is moved toward the first fixing jig and the support surface of the movable block faces upward;
After completion of the first block positioning step, by supporting the one surface of the cutter body on the support surface of the movable block, the blade edge of the cutter body is abutted against the blade body abutting member, With the entire cutting edge of the blade body protruding from one side edge of the support surface of the movable block, the blade body is positioned with respect to the movable block, and then the other side of the blade body by the clamper. An integration step of integrating the blade body with the movable block by pressing the vicinity of the edge of the blade edge;
After completion of the integration step, the movable block is moved from the first fixed jig side to the second fixed jig side so that the support surface of the movable block faces downward. A second block positioning step for positioning at the second reference position;
After the end of the second block positioning step, the discharge electrode and the blade edge on one side of the blade body are opposed to each other with the discharge electrode in the discharge surface treatment apparatus facing the edge of the blade edge on one side of the blade body. A pulsed discharge is generated between the edge portion and the constituent material of the discharge electrode or its reactant is welded to the edge portion of the blade edge on one side of the blade body by the discharge energy to form the coating film. A discharge surface treatment method comprising: forming a film.   A blade, wherein a coating is formed on the edge of the blade edge on one side of the blade body by the discharge surface treatment method according to claim 3.

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