JP2014176862A - Polishing blade tool for electrode tip dresser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a polishing amount of an electrode tip.SOLUTION: A polishing blade tool (200), attached to a holder of an electrode tip dresser for polishing an electrode tip, comprises: a first blade (211) for polishing a side face of the electrode tip; and a second blade (221) separated from the first blade for polishing a tip surface of the electrode tip.

Description

  The present invention relates to a polishing blade used in an electrode tip dresser that is an apparatus for polishing an electrode tip for resistance welding.

  The resistance welder has a pair of electrode tips provided above and below the workpiece to be welded (for example, a galvanized steel plate). When resistance welding is performed with a pair of electrode tips sandwiching a workpiece to be welded, a nugget is formed on the workpiece. However, as the resistance welding is performed a plurality of times, the tip of the electrode tip is gradually deformed, and a nugget having a desired shape cannot be formed. Therefore, after performing resistance welding a certain number of times, a polishing operation is performed in which the tip of the electrode tip is polished to form a desired shape.

  The electrode tip dresser is an apparatus for polishing an electrode tip for resistance welding. As a conventional electrode tip dresser, for example, the one described in Patent Document 1 is known. The electrode tip dresser includes a holder, a cutter body (also referred to as “abrasive blade”) attached to the holder, and a rotation driving unit that rotates the holder. The cutter body has two cutting edges on its upper and lower surfaces. When polishing the pair of electrode tips of the resistance welder, first, in a state where the cutter body mounted on the holder is stopped, the pair of electrode tips are brought close to the cutter body and pressed to sandwich the cutter body. The two cutting blades of the cutter body are in a state where they are respectively biting into the pair of electrode tips. Thereafter, when the rotation drive unit rotates the cutter body together with the holder, the two cutting blades of the cutter body polish or cut the tip portions of the two electrode chips to form a desired shape. In other words, in this cutter body, one continuous cutting edge cuts and polishes the tip of one electrode tip.

Japanese Patent No. 3811855

  However, in this conventional electrode tip dresser using the cutter body, the entire tip of one electrode tip is cut and polished with one continuous blade, so that the blade bites into the tip of the electrode tip considerably. When the blade was rotated in this state, the amount of polishing was inevitably increased. In other words, conventionally, the amount of polishing (cutting amount) at the tip of the electrode tip is considerably large, and thus there is a problem that the electrode tip is consumed quickly. Further, when the consumption of the electrode tip proceeds to some extent, it becomes necessary to replace the electrode tip itself. In the above prior art, since the electrode tip is quickly consumed, the electrode tip needs to be replaced frequently, and the efficiency of the welding operation itself is greatly reduced.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms.

(1) According to one aspect of the present invention, there is provided a polishing blade attached to a holder of an electrode tip dresser for polishing an electrode tip. The polishing blade includes a first blade for polishing the side surface of the electrode tip, and a second blade separated from the first blade, and a second blade for polishing the tip surface of the electrode tip. A blade.
According to this polishing blade, since the first blade for polishing the side surface of the electrode tip and the second blade for polishing the tip end surface of the electrode tip are separated from each other, these two blades However, it is possible to perform polishing in a state that does not bite into the tip portion of the electrode tip, and as a result, the amount of polishing can be reduced compared to the conventional case.

(2) In the polishing blade, a receiving surface that receives the tip surface of the electrode tip may be formed at a position adjacent to the second blade of the member on which the second blade is formed.
According to this polishing blade, since the tip surface of the electrode tip is received by the receiving surface of the polishing blade, the polishing can be performed with the first and second blades hardly biting into the tip portion of the electrode tip. Can be further reduced.

(3) In the polishing blade, the receiving surface may have a semicircular shape that receives a half of the tip surface of the electrode tip.
In this polishing blade, the tip surface of the electrode tip can be received more reliably on the receiving surface, so that the polishing amount can be further reduced.

(4) In the polishing blade, the second blade may have an R chamfer shape.
With this polishing blade, the amount of polishing by the second blade can be further reduced.

(5) The polishing blade has a through-hole through which an attachment for attaching the polishing blade to the holder of the electrode tip dresser passes, and a plate-like portion on which the first blade is formed; Assuming a rotating shaft in which the holder and the polishing blade rotate while the polishing blade is attached to the holder, the electrode tip receiving portion is located closer to the rotating shaft than the plate-like portion. And an electrode tip receiving portion having a shape for receiving the tip end surface of the electrode tip and having the second blade formed thereon.
According to this polishing blade, the shape of the plate-like portion on which the first blade is formed and the shape of the electrode tip receiving portion on which the second blade is formed are formed in desired shapes corresponding to the respective functions. be able to.

(6) In the polishing blade, the second blade may extend in a direction inclined with respect to a plane including a cutting edge of the first blade.
According to this polishing blade, it is easy to form the first blade and the second blade in a shape separated from each other.

(7) In the polishing blade, the second blade may extend in a direction perpendicular to a plane including a cutting edge of the first blade.
According to this polishing blade, it is easier to form the first blade and the second blade in a shape separated from each other.

  The present invention can be realized in various forms other than the apparatus. For example, it can be realized in the form of a polishing blade, a polishing blade assembly including a polishing blade and a holder, and an electrode tip dresser including a polishing blade, a holder, and a driving device (rotation drive unit) thereof.

The disassembled perspective view which shows the grinding | polishing blade tool and holder in 1st Embodiment of this invention. The perspective view which expands and shows the polishing blade of 1st Embodiment, and the figure which shows a wire frame display. The top view, the left view, the front view, the right view, and the bottom view of the polishing blade of the first embodiment. The perspective view which shows the polishing blade tool of a comparative example. Explanatory drawing which shows the use condition of the polishing blade of 1st Embodiment, and the polishing blade of a comparative example. The perspective view of the grinding | polishing blade tool as 2nd Embodiment, and the figure which shows the wire frame display of the part of the 2nd blade of 1st Embodiment and 2nd Embodiment. The top view, the left view, the front view, the right view, and the bottom view of the polishing blade of the second embodiment. Explanatory drawing which shows the polishing blade tool of other embodiment, and its use condition.

<First Embodiment>
FIG. 1 is an exploded perspective view showing a polishing blade and a holder in the first embodiment of the present invention. The holder 100 has a cutting tool housing portion 110 for housing the polishing blade tool 200, and a screw hole 120 is formed in the approximate center of the cutting tool housing portion 110. The screw hole 120 is for fixing the polishing blade 200 to the holder 100 using a screw 130 as an attachment tool. The holder 100 is driven by a driving device (not shown) and rotates about the rotation axis C. The rotation direction of the holder 100 is a clockwise direction when the holder 100 is viewed from above.

  In this specification, a direction parallel to the rotation axis C is referred to as “vertical direction”. The vertical direction usually coincides with the vertical direction, but may be a direction slightly inclined from the vertical direction. Of the up and down directions, the direction close to the vertical upward direction is referred to as “upward direction”, and the direction close to the vertical downward direction is referred to as “downward direction”. A direction perpendicular to the vertical direction is referred to as a “horizontal direction”.

  The polishing blade 200 has a first blade 211 for polishing the side surface of the electrode tip used for resistance welding, and a second blade 221 for polishing the tip surface of the electrode tip. It is preferable that the first blade 211 and the second blade 221 are not continuous and are separated from each other. The first blade 211 is formed in the plate-like portion 210 having the through hole 214. The through-hole 214 is for allowing the screw 130 as the attachment tool to pass therethrough. The second blade 221 is formed in the electrode tip receiving portion 220 that receives the tip surface of the electrode tip.

  FIG. 2A is an enlarged perspective view showing the polishing blade 200 of the first embodiment, and FIG. 2B is a wire frame display thereof. Hereinafter, in the polishing blade 200, a portion close to the rotation axis C (portion near the left end in FIG. 2A) is referred to as a “front end portion”, and a portion far from the rotation axis C is referred to as a “rear end portion”. A slit 216 connected to the through hole 214 is formed at the rear end of the polishing blade 200. When a virtual plane passing through the center of the slit 216 is assumed, the polishing blade 200 has a mirror-symmetrical shape up and down with respect to this virtual plane. Accordingly, the first blades 211 are provided on the upper side and the lower side of the plate-like portion 210, respectively. The second blades 221 are also provided at the upper and lower corner portions of the electrode tip receiving portion 220, respectively.

  Receiving surfaces 224 for receiving the tip surfaces of the electrode tips are provided on the upper and lower surfaces of the electrode tip receiving portion 220, respectively (FIG. 2B). The receiving surface 224 preferably has a semicircular shape that receives half of the tip surface of the electrode tip. When the desired shape of the tip surface of the electrode tip is a spherical surface having a predetermined radius, it is preferable that the receiving surface 224 is also formed of a spherical concave surface having the same radius. The “desirable shape of the tip surface of the electrode tip” is a shape after the polishing is completed, and is usually the same as the shape of the tip surface of the electrode tip when not in use.

  3A is a plan view of the polishing blade 200 of the first embodiment, FIG. 3B is a left side view, FIG. 3C is a front view, and FIG. 3D is a right side view. 3 (E) is a bottom view. The plate-like portion 210 has a front surface 10 and a back surface 12. The front surface 10 and the back surface 12 are preferably planes parallel to each other. The surface 10 corresponds to a plane including the cutting edges of the upper and lower two first blades 211. The surface 10 functions as a rake face of the first blade 211. The rake angle of the first blade 211 is an angle between the surface 10 of the plate-like portion 210 and the normal of the side surface of the electrode tip. In this example, the rake angle of the first blade 211 is 0 °. The rake angle of the first blade 211 is preferably a value in the range of −5 ° to + 5 °. Of the side surfaces between the front surface 10 and the back surface 12 of the plate-like portion 210, the side surface 14 adjacent to the first blade 211 functions as a flank of the first blade 211. The clearance angle γ1 (FIG. 2A) of the first blade 211 is an angle formed by the side surface 14 of the plate-like portion 210 and the tangent to the side surface of the electrode tip. In this example, the clearance angle γ1 is 3 °. The clearance angle γ1 of the first blade 211 is preferably a value in the range of 2 ° to 8 °.

  The second blade 221 provided in the electrode tip receiving part 220 is provided in a direction perpendicular to the surface 10 of the plate-like part 210. In other words, the cutting edge of the second blade 221 extends along a direction perpendicular to a plane including the cutting edges of the upper and lower two first blades 211. The tip surface 30 of the electrode tip receiving part 220 functions as a rake face of the second blade 221. The rake angle of the second blade 221 is an angle formed by the tip surface 30 of the electrode tip receiving portion 220 and the normal line of the bottom surface of the electrode tip. In this example, the rake angle of the second blade 221 is 0 °. However, the rake angle of the second blade 221 is preferably a value in the range of −5 ° to + 5 °. The receiving surface 224 of the electrode tip receiving part 220 functions as a flank of the second blade 221. The clearance angle γ2 (FIG. 2A) of the second blade 221 is an angle formed by the tip surface 30 of the electrode tip receiving part 220 and the tangent to the tip surface of the electrode tip. In this example, the clearance angle γ2 is 3 °. It is. The clearance angle γ2 of the second blade 221 is preferably a value in the range of 2 ° to 8 °. When the receiving surface 224 is formed as a spherical concave surface, the clearance angle γ2 of the second blade 221 varies somewhat over the entire second blade 221. However, also in this case, the angle between the tip surface 30 of the electrode tip receiving part 220 and the receiving surface 224 is formed to be an acute angle slightly smaller than 90 ° as a whole so that the receiving surface 224 functions as a flank. It is preferable that As will be described later, the length L2 (FIG. 3A) of the cutting edge of the second blade 221 is preferably set to be equal to the diameter of the tip surface of the electrode tip.

  As a material of the polishing blade 200 of the first embodiment, for example, various materials such as high speed steel, cemented carbide and ceramics can be used. In manufacturing the polishing blade 200, it is possible to use various known manufacturing methods depending on the material.

  As shown in FIG. 3C, the first blade 211 in the first embodiment has an arc shape with a radius R1. This radius R1 is preferably the same as the radius of the spherical side surface of the electrode tip to be polished. Further, the receiving surface 224 of the electrode tip receiving portion 220 is a spherical concave surface having a radius R2. This radius R2 is preferably the same as the radius of the spherical convex surface of the bottom surface of the electrode tip to be polished.

  FIG. 4 is a perspective view showing a polishing blade 300 of a comparative example. The polishing blade 300 of the comparative example is common to the polishing blade 200 of the first embodiment in that it has two blades 311 corresponding to the first blade 211 of the polishing blade 200 of the first embodiment. . However, the polishing blade 300 of the comparative example is different from the polishing blade 200 of the first embodiment in that the second blade 221 and the electrode tip receiving portion 220 are not provided. The polishing blade 300 is the same as the cutter body described in Japanese Patent No. 381855 described in the prior art.

  FIG. 5A is an explanatory diagram illustrating a usage state of the polishing blade 200 of the first embodiment. Here, a state is shown in which the upper electrode tip ET1 and the lower electrode tip ET2 are simultaneously polished by the polishing blade 200 or 300. In this figure, the position when the polishing blade 200 rotates about the rotation axis C is drawn by a broken line. The rotation axis C is on a plane including the cutting edges of the upper and lower first blades 211. The shapes of the upper and lower electrode chips ET1, ET2 are the same. As shown in the lower part of FIG. 5A, a side surface SS and a front end surface BS are provided at the front end of the electrode tip ET2. In this example, the side surface SS of the electrode tip ET2 is a spherical convex surface with a radius R1, and the tip surface BS is a spherical convex surface with a radius R2. The radius R1 of the side surface SS of the electrode tip ET2 is the same as the radius R1 of the first blade 211 of the polishing blade 200 (FIG. 3C). The radius R2 of the tip surface BS of the electrode tip ET2 is the same as the radius R2 of the receiving surface 224 of the polishing blade 200 (FIG. 3C). In a specific example, the radius R1 of the side surface SS of the electrode tip ET2 is about 8 mm, the radius R2 of the tip surface BS of the electrode tip ET2 is about 40 mm, and the diameter of the tip surface BS is about 6 mm. The length L2 of the blade edge of the second blade 221 (FIG. 3A) is set to a length equal to the diameter of the tip surface BS of the electrode tip.

  As shown in FIG. 5A, when the two electrode tips ET1 and ET2 are pressed from above and below the polishing blade 200 to sandwich the polishing blade 200, the tip surfaces BS of the electrode tips ET1 and ET2 are received by the two receiving tips of the polishing blade 200. Received by surface 224. Therefore, the electrode tips ET1 and ET2 are stopped in a state where the first blade 211 and the second blade 221 of the polishing blade 200 hardly bite into the electrode tips ET1 and ET2. When the polishing blade 200 rotates together with the holder 100 (FIG. 1) in this state, the surfaces of the electrode tips ET1 and ET2 are polished, and the tip surface BS and the side surface SS of the electrode tips ET1 and ET2 are polished into desired shapes.

  FIG. 5B is an explanatory diagram showing a usage state of the polishing blade 300 of the comparative example. When the polishing blade 300 is sandwiched between the two electrode tips ET1 and ET2, the blade 311 of the polishing blade 300 stops in a state where the blade 311 has bite into the electrode tips ET1 and ET2 as indicated by broken lines. When the polishing blade 300 is rotated together with the holder 100 (FIG. 1) in this state, the surfaces of the electrode tips ET1 and ET2 are cut by the blade 311 and the tip surface BS and the side surface SS of the electrode tips ET1 and ET2 are polished into desired shapes, respectively. Is done. However, in this comparative example, as can be understood from the initial state of polishing shown in FIG. 5B, the polishing amount of the electrode tip (the thickness at which the surface of the electrode tip is removed by polishing) is the electrode in the first embodiment. It is extremely large compared to the amount of polishing of the chip. For example, in the polishing test using the polishing blade 200 of the first embodiment, the polishing amount at the completion of one polishing was about 0.05 mm, whereas the polishing using the polishing blade 300 of the comparative example was performed. The amount was about 0.15 mm. That is, in the polishing blade 200 of the first embodiment, the polishing can be completed once with a polishing amount of about 1/3 of the polishing blade 300 of the comparative example, and the tip of the electrode tip can be shaped into a desired shape. Is possible.

  In the polishing blade 200 of the first embodiment, one of the reasons that the amount of biting of the first blade 211 and the second blade 221 with respect to the electrode tip is extremely small is that the first blade 211 and the second blade 221 are continuous. It can be considered that it is caused by being separated from each other. That is, when the first blade 211 and the second blade 221 are formed in a shape like one continuous blade, the blade bites into the electrode tip considerably like the polishing blade 300 of the comparative example. It is complicated. On the other hand, if the two blades 211 and 221 are not continuous and separated from each other, the member between the two blades 211 and 221 suppresses the bite of the electrode tip, and the bite amount is reduced. Further, in the polishing blade 200 of the first embodiment, since the receiving surface 224 that receives the tip surface of the electrode tip is provided, the amount of biting of the two blades 211 and the blade 221 with respect to the electrode tip can be further reduced, The amount of polishing can be further reduced.

  Thus, in the polishing blade 200 of the first embodiment, the first blade 211 that polishes the side surface of the electrode tip and the second blade 221 that polishes the tip surface of the electrode tip are not continuous with each other and separated. Therefore, the polishing amount (consumption amount) of the electrode tip in one polishing operation can be reduced as compared with the conventional case. In the first embodiment, since the consumption amount of the electrode tip in one polishing is small, the frequency of replacing the electrode tip can be reduced. For example, in the case of the polishing blade 300 of the comparative example, when it is necessary to replace the electrode tip every 3 to 4 hours, if the polishing blade 200 of the first embodiment is used, about every 3 times (9 to It is sufficient to change the electrode tips every 12 hours). As a result, it is possible to greatly improve the work efficiency at the welding work site.

Second Embodiment
6A is a perspective view of a polishing blade as a second embodiment, and FIGS. 6B and 6C are enlarged views of the second blade of the first embodiment and the second embodiment. It is a wire frame display. 7A is a plan view of the polishing blade 200a of the second embodiment, FIG. 7B is a left side view, FIG. 7C is a front view, and FIG. 7D is a right side view. FIG. 7E is a bottom view. The polishing blade 200a of the second embodiment differs from the polishing blade 200 of the first embodiment in that the second blade 221a of the electrode tip receiving part 220a is chamfered. That is, the second blade 221 of the first embodiment has an acute angle (or substantially right angle) blade edge, whereas the second blade 221a of the second embodiment has two blade edges constituting the blade edge. R chamfering is provided between the surfaces. Note that the polishing blade 200a of the second embodiment can be considered to have a configuration in which a chamfered portion is added to the tip portion of the polishing blade 200 of the first embodiment. As a chamfering shape, C chamfering may be adopted instead of R chamfering.

  As shown in FIG. 6 (B), in the polishing blade 200 of the first embodiment, the cutting edge of the second blade 221 is almost a right angle, so the rotation axis C is the center of the second blade 221 and It exists in the position corresponding also to the edge part of the receiving surface 224. FIG. On the other hand, as shown in FIGS. 6A and 6C, in the polishing blade 200a of the second embodiment, the rotation axis C is at the boundary between the second blade 221a and the receiving surface 224. However, the position of the rotation axis C may be a position moved from these positions in the front-rear direction (the left-right direction in FIGS. 6A to 6C). For example, if the cutting edge of the second blade 221 of the polishing blade 200 of the first embodiment is chamfered, the rotation axis C is located outside (the tip side) from the receiving surface 224 and the second blade 221 is used. It will be located at the end of. In this case, the receiving surface 224 has an area smaller than half of the tip surface BS of the electrode tip (FIG. 5A). However, as in the first and second embodiments, the electrode surface can be received more reliably when the receiving surface 224 has an area for receiving the half of the tip surface of the electrode chip, and the amount of polishing can be reduced. Is more preferable in that it can be further reduced.

  The amount of polishing per polishing in the polishing test using the polishing blade 200a of the second embodiment was about 0.01 mm. This is about 1/5 of about 0.05 mm, which is the polishing amount when the polishing blade 200 of the first embodiment is used, and is about the polishing amount when the polishing blade 300 of the comparative example is used. It was about 1/15 of 0.15 mm. That is, in the polishing blade 200a of the second embodiment, the polishing can be completed once with a polishing amount of about 1/15 of the polishing blade 300 of the comparative example, and the tip of the electrode tip can be shaped into a desired shape. Is possible.

  As described above, also in the polishing blade 200a of the second embodiment, the first blade 211 that polishes the side surface of the electrode tip and the second blade 221a that polishes the tip surface of the electrode tip are not continuous with each other. Since they are separated, the polishing amount (consumption amount) of the electrode tip in one polishing operation can be significantly reduced as compared with the conventional case. Further, in the second embodiment, since the consumption amount of the electrode tip during polishing is extremely small, it is possible to greatly reduce the frequency of replacing the electrode tip. For example, in the case of the polishing blade 300 of the comparative example, when it is necessary to replace the electrode tip every 3 to 4 hours, if the polishing blade 200a of the second embodiment is used, the frequency is once every 1 to 3 days. It is sufficient to replace the electrode tip. As a result, it is possible to greatly improve the work efficiency at the welding work site.

<Other embodiments>
FIGS. 8A to 8C are explanatory views showing polishing blades according to various embodiments and usage states thereof. In these drawings, the lower electrode chip is not shown for convenience of illustration. FIG. 8A is the same as the polishing blade 200a of the second embodiment shown in FIG. Further, the electrode tip ETa of FIG. 8A is the same as the electrode tip ET1 (FIG. 5A) used in the first embodiment. In the electrode tip ET1, the desirable shapes of the side surface SS and the front end surface BS of the tip are both spherical convex surfaces. The shape of the cutting edge of the first blade 211 of the polishing blade 200a of the second embodiment is an arcuate curve that matches the desired shape of the side surface of the electrode tip ETa, and the shape of the electrode tip receiving surface 224 is an electrode. It is a spherical concave surface that matches the desired shape of the tip surface BS of the chip ETa.

  In the embodiment of FIG. 8B, the shape of the electrode tip ETb is different from the first embodiment and the second embodiment. The electrode tip ETb is a surface (that is, a conical surface) in which the desired shape of the side surface SS of the tip portion is chamfered to about 30 ° (ie, a conical surface), and the desired shape of the tip surface BS is a flat surface. The shape of the cutting edge of the first blade 211 of the polishing blade 200b for polishing the electrode tip ETb is a straight line that matches the desired shape of the side surface of the electrode tip ETb, and the shape of the electrode tip receiving surface 224 is the electrode tip. It is a flat circle that matches the desired shape of the tip surface BS of ETb.

  Also in the embodiment of FIG. 8C, the shape of the electrode tip ETc is different from the first embodiment and the second embodiment. The electrode tip ETc is a surface in which the desired shape of the side surface SS of the tip portion is chamfered at about 45 ° (ie, a conical surface), and the desired shape of the tip surface BS is a flat surface. The shape of the cutting edge of the first blade 211 of the polishing blade 200c for polishing the electrode tip ETc is a straight line that matches the desired shape of the side surface of the electrode tip ETc, and the shape of the electrode tip receiving surface 224 is the electrode tip. It is a flat circle that matches the desired shape of the tip surface BS of ETc.

  As can be understood from these various embodiments, the shapes of the first blade 211 and the receiving surface 24 of the polishing blade match the desired shapes of the side surface SS and the tip surface BS at the tip of the electrode tip to be polished. It is preferable to form in a simple shape.

<Modification>
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

・ Modification 1:
In the various embodiments described above, the electrode chip receiving part 220 having the receiving surface 224 for receiving the electrode chip is provided, but the electrode chip receiving part 220 may be omitted. However, even when the electrode tip receiving portion 220 is omitted, the cutting edge of the first blade 211 that polishes the side surface of the electrode tip and the cutting edge of the second blade 221 that polishes the tip surface of the electrode tip are not continuous. It is preferable to form the polishing blades so that they are separated from each other. However, if the electrode chip receiving part 220 having the receiving surface 224 for receiving the electrode chip is provided as in the various embodiments described above, as described with reference to FIGS. 5 (A) and 5 (B), Since the tip surface of the electrode tip can be reliably received by the receiving surface 224, the amount of polishing of the electrode tip can be further reduced.

Modification 2
In the various embodiments described above, the length L2 of the blade edge of the second blade 221 (FIG. 3A) is set to be equal to the diameter of the tip surface of the electrode tip. The length of the cutting edge 221 may be larger or smaller than the diameter of the tip surface BS of the electrode tip. For example, among the second blade 221 (FIG. 2 (A)) of the polishing blade 200 of the first embodiment, the portion most often used for polishing the electrode tip is the front side of the rotating shaft C (FIG. 2 ( This is a cutting edge portion at a portion protruding from the plate-like portion 210 to the near side in A). Therefore, it is possible to omit a part or all of the blade edge portion on the back side of the rotation axis C in the second blade 221. The same applies to other embodiments. However, if the length L2 of the cutting edge of the second blade 221 is set equal to the diameter of the tip surface BS of the electrode tip, it is easy to make a shape that reliably receives the tip surface BS of the electrode tip by the receiving surface 224. There is an advantage.

・ Modification 3:
In the various embodiments described above, the second blade 221 extends along a direction perpendicular to the plane including the cutting edge of the first blade 211 (the surface 10 of the plate-like portion 210). The blade 221 may be inclined from a direction perpendicular to the plane including the cutting edge of the first blade 211. That is, generally, the second blade 221 is inclined with respect to the plane including the cutting edges of the two first blades 211 (that is, the direction intersecting the plane including the cutting edges of the two first blades 211). It is preferable to extend along. By doing so, the direction of the cutting edge of the first blade 211 and the direction of the cutting edge of the second blade 221 do not match, so that these two types of blades 211 and 221 are prevented from excessively biting into the electrode tip. It is possible to reduce the polishing amount per time.

  The present invention is not limited to the above-described embodiments, examples, and modifications, and can be realized with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Front surface 12 ... Back surface 14 ... Side surface 24 ... Receiving surface 30 ... Front end surface 100 ... Holder 110 ... Blade tool accommodating part 120 ... Screw hole 130 ... Screw 200 ... Polishing blade tool 210 ... Plate-shaped part 211 ... First blade 214 ... Through Hole 216 ... Slit 220 ... Electrode tip receiving portion 221 ... Second blade 224 ... Receiving surface 300 ... Polishing blade 311 ... Blade C ... Rotating shaft SS ... Side surface of electrode tip BS ... End surface of electrode tip

Claims (7)

A polishing blade attached to a holder of an electrode tip dresser for polishing an electrode tip,
A first blade for polishing a side surface of the electrode tip;
A second blade separated from the first blade, the second blade for polishing the tip surface of the electrode tip;
A polishing blade comprising: A polishing blade according to claim 1, wherein
A polishing blade, wherein a receiving surface for receiving a tip surface of the electrode tip is formed at a position adjacent to the second blade of a member on which the second blade is formed. A polishing blade according to claim 2, wherein
The receiving blade has a semicircular shape that receives a half of the tip surface of the electrode tip. The polishing blade according to any one of claims 1 to 3,
The second blade has a round chamfered shape. The polishing blade according to any one of claims 1 to 4,
A plate-like portion having a through-hole through which an attachment for attaching the polishing blade to the holder of the electrode tip dresser passes, and wherein the first blade is formed;
Assuming a rotating shaft in which the holder and the polishing blade rotate while the polishing blade is attached to the holder, the electrode tip receiving portion is located closer to the rotating shaft than the plate-like portion. An electrode tip receiving portion having a shape in which the second blade is formed and receiving the tip surface of the electrode tip;
A polishing blade comprising: A polishing blade according to claim 5, wherein
The said 2nd blade is a grinding | polishing blade tool extended in the direction inclined with respect to the plane containing the blade edge | tip of the said 1st blade. The polishing blade according to claim 6, wherein
The said 2nd blade is a polishing blade tool extended in the direction perpendicular | vertical with respect to the plane containing the blade edge | tip of the said 1st blade.

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