JP5814580B2 - Cutting cutter for chip dress - Google Patents

Description

  The present invention relates to a cutting cutter for chip dress used for cutting a tip portion of an electrode tip for spot welding.

  In general, the tip of the electrode tip used for spot welding is worn or worn by a predetermined number of times, or the state deteriorates due to adhesion of an oxide film or the like, so the tip is periodically cut using a tip dress. There is a need.

  For example, Patent Document 1 discloses a cutting cutter for chip dress provided with a rotating body composed of four tip receiving portions that receive the tip portion of an electrode tip. One end of the chip receiving portion is integrally connected at the rotation center of the rotating body, and the other end is separated from each other by 90 ° in the rotation direction of the rotating body, and the rotating body has a cross shape in plan view. Yes. At least one of the tip receiving portions is provided with a cutting edge portion, and by rotating the rotating body with the tip portion center of the electrode tip corresponding to the intersecting portion of the tip receiving portion, The tip of the electrode tip is cut with the cutting blade.

JP 2008-73716 A (paragraphs 0023, 0024, FIGS. 3 to 9)

  By the way, since the cutting blade part of the cutting cutter of patent document 1 has extended only to the rotation center along the electrode tip front-end | tip part, the front-end | tip part center of an electrode tip shifted | deviated with respect to the rotation center of a rotary body unexpectedly. As a result, the center part of the tip of the electrode tip is not partially cut.

  Further, the tip portion of the electrode tip has a gently curved shape, and the central portion thereof is substantially flat. Therefore, when the shape of the cutting edge portion is made to correspond to the tip end portion of the electrode tip as in Patent Document 1, the portion corresponding to the center portion of the tip end portion of the cutting edge portion is compared to the center portion of the tip end portion of the electrode tip. Therefore, only the cutting ability of rubbing and peeling off the central portion of the electrode tip at the time of cutting can be obtained, and the remaining portion of the oxide film or the like becomes larger than other portions.

  This invention is made | formed in view of such a point, The place made into the objective is providing the cutting cutter for chip dresses which can cut especially the center part of an electrode front-end | tip part reliably.

  In order to achieve the above object, the present invention is characterized in that the cutting edge portion extends beyond the rotation center of the rotating body while being inclined so as to be gradually separated from the tip portion of the electrode tip.

  Specifically, a rotating body including a plurality of tip receiving portions that receive the tip end portion of the electrode tip for spot welding and having a cutting edge portion provided in one of the tip receiving portions is provided, and the rotating body is rotated. Thus, the following solution was taken in the cutting cutter for chip dress that cuts the tip of the electrode tip with the cutting edge.

That is, in the first invention, one end of the plurality of chip receiving portions is integrally connected at the rotation center of the rotating body, the other end is separated from each other in the rotation direction of the rotating body, and at least two of the rotating portions are rotating bodies. The center of the tip of the electrode tip corresponds to the connecting portion on the one end side, and the cutting edge portion is provided on the one tip receiving portion facing to each other. The one end side of the cutting blade portion in the extending direction is linearly inclined so as to gradually move away from the tip end portion of the electrode tip received by each tip receiving portion, and the other side of the other end of the other end of the other end of the rotating body. While extending to the tip receiving portion side, the other side from the middle in the extending direction of the cutting edge portion is gently curved so as to correspond to the tip end portion of the electrode tip received by each tip receiving portion . It is characterized by.

  According to a second invention, in the first invention, the cutting edge portions are provided on both ends of the opposite one of the tip receiving portions in the rotation center direction of the rotating body, and are provided on both sides of the rotating body in the rotation center direction. It is characterized in that the tip part of the arranged electrode tip is cut at the same time with the two cutting blade parts.

  According to a third aspect, in the first aspect, the cutting edge portion is provided on one end side in the rotation center direction of the rotating body on the one opposing chip receiving portion side and the other opposing tip receiving portion. The tip of the electrode tip provided on the other side in the rotation center direction of the rotating body on the part side and disposed on both sides in the rotation center direction of the rotating body is cut at the same time with the two cutting blades. It is characterized by.

  According to a fourth invention, in the invention according to any one of the first to third aspects, a guide portion extending along the outer peripheral portion of the tip portion of the electrode tip is formed at an inclination on the other end side of the tip receiving portion. The cutting edge portion extends to an end portion of the guide portion.

  According to a fifth aspect, in the invention according to any one of the first to fourth aspects, the cutting edge portion is subjected to a chromium-based surface treatment.

In a sixth aspect of the invention, in the invention according to any one of the first to fifth aspects, the cutting edge portion is spaced from the tip portion of the electrode tip toward the opposite side of the rotation direction of the rotating body. The clearance angle which inclines linearly is formed, The front surface at the time of rotation of the said cutting-blade part is extended perpendicularly | vertically with respect to the rotation direction, It is characterized by the above-mentioned.

  In the first invention, since the cutting edge extends beyond the rotation center of the rotating body, even if the tip center of the electrode tip is unexpectedly shifted from the rotation center of the rotating body, the center of the tip of the electrode chip The cutting edge portion comes into contact with the portion with certainty, and the center portion of the tip portion of the electrode tip can be cut reliably. In addition, since the periphery of the rotation center of the cutting edge portion is inclined with respect to the central portion of the electrode tip tip, the cutting ability of the cutting cutter with respect to the central portion of the electrode tip tip is increased, and the central portion of the electrode tip tip is reliably secured. Can be cut. In addition, although the protrusion is formed at the center of the tip of the electrode tip after cutting, it disappears by pressurizing the material to be welded at the time of welding, so that the welding is not affected.

  In the second and third inventions, the tip portions of the pair of electrode tips arranged on both sides in the rotation center direction can be cut simultaneously, and the pair of electrode tips can be brought into an appropriate state without lowering the operation rate of the production line.

  In the fourth invention, when the tip of the electrode tip is guided toward the cutting edge by each guide, the cutting edge extends to the guide even if the scrap is attached to the outer peripheral portion of the tip of the electrode tip. Will remove the adhesion of scraps. Therefore, it is possible to prevent variations in the positioning of the electrode tip due to adhesion of the shavings to the electrode tip and to cut the tip of the electrode tip with high accuracy.

  In 5th invention, since the hardness of a cutting-blade part goes up, the lifetime of a cutting-blade part can be extended.

It is a chip dress provided with the cutting cutter which concerns on embodiment of this invention. It is a perspective view of a cutting cutter concerning an embodiment of the present invention. It is a top view of a cutting cutter concerning an embodiment of the present invention. (A) is the sectional view on the AA line of FIG. 2, (b) is the C section enlarged view of (a). FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a side view of the tip side of an electrode tip after cutting with a cutting cutter concerning an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows a tip dress 9 provided with a cutting cutter 1 according to an embodiment of the present invention. The tip dress 9 is for cutting the front end portions 2a of a pair of electrode tips 2 which are fitted into the shank S of the welding gun G and are opposed to each other. The tip dress 9 extends in the horizontal direction and has a flat and substantially rectangular parallelepiped shape. A dress body 3 having a shape and a motor 4 attached to the lower side on one side in the longitudinal direction of the dress body 3 so that the output shaft is directed vertically.

  On the other side in the longitudinal direction of the dress body 3, a through hole 3 a penetrating vertically is formed, and a rotation center 10 a (FIG. 2) is located at a position corresponding to the through hole 3 a inside the dress body 3 in the longitudinal direction. The cutting cutter 1 is rotatably mounted so that it faces up and down (shown in FIG. 5), and rotates counterclockwise X in a plan view through a gear meshing mechanism (not shown) by the rotational drive of the motor 4. It is like that.

  As shown in FIGS. 2 and 3, the cutting cutter 1 includes a rotating body 10 that receives the tip 2 a of the electrode tip 2, and the rotating body 10 has a first plate member 5 that has substantially the same outer shape. And four chip receiving portions 7 formed by assembling the second plate member 6 in a cross shape in plan view, one side of the plate surface of the first plate member 5 and the plate surface of the second plate member 6 The crossing portion of the first plate member 5 and the second plate member 6 is eccentric in plan view so that the line of intersection with the one side becomes the rotation center 10a.

  One end of each of the four chip receiving portions 7 is integrally connected to the rotation center 10a of the rotating body 10 and the other end is separated from each other by 90 ° in the rotation direction of the rotating body 10. Two of the seven are arranged opposite to each other on both sides of the rotation center 10 a of the rotating body 10. A guide portion 7a extending along the outer peripheral portion of the tip portion 2a of the electrode chip 2 is formed on the other end side of each tip receiving portion 7 so as to be inclined, and the guide portion 7a has a cutting blade described later. The tip end side of the electrode tip 2 is guided to the part 8 side.

  As shown in FIG. 4A, the first plate member 5 has a shape in which two chip receiving portions 7 arranged opposite to each other on both sides of the rotation center 10a are integrated, and the first plate member A rectangular assembling hole 5 a for assembling the second plate member 6 is formed in the approximate center of 5.

  A pair of projecting portions 5b projecting outward are projected on both the left and right sides of the first plate member 5. The projecting portions 5b are ring members 1a (shown only in FIG. 1). The rotating body 10 is attached to the cutting cutter 1 by being sandwiched from above and below.

  Further, a pair of curved portions 5c are formed in a concave shape above and below the first plate member 5, and a rotating body in one longitudinal side of each curved portion 5c, that is, one of the chip receiving portions 7 facing each other. 10. Cutting edges extending along the radial direction of the tip 2a so as to correspond to the shape of each tip 2a of the electrode tip 2 arranged on both sides of the rotation body 10 in the direction of the rotation center 10 A pair of portions 8 are provided.

The cutting edge portion 8 is subjected to a chromium-based surface treatment and has a hardness of about HRC = 300, and as shown in FIG. 5, the front surface (first plate member 5) when the cutting edge portion 8 is rotated. One side of the plate surface) extends perpendicularly to the rotation direction, and the so-called rake angle α is not formed (rake angle α = 0 °). Further, the cutting edge 8, so-called clearance angle which progressively inclined to be separated from the tip portion 2a of the electrode tip 2 toward the opposite side of the rotating direction of the rotary member 10 (clockwise in plan view) beta ( The clearance angle β is set to about 5 °.

Then, the one side in the extending direction of the cutting edge 8 is gradually separated from the tip 2a of the electrode tip 2 in the state received by each tip receiving portion 7 , as shown in FIGS. 4 (a) and 4 (b). In this way, it extends while being inclined in a straight line and extends to the other tip receiving portion 7 beyond the rotation center 10a, while the other end side from the midway in the extending direction of the cutting edge portion 8 is the tip receiving portion. While gently curving so as to correspond to the tip 2a of the electrode tip 2 in the state received by the part 7, the other side in the extending direction of the cutting edge 8 extends to the end of the guide 7a.

  As shown in FIG. 4B, the angle θ between the rotation center 10a of the tip 2a of the electrode tip 2 and the cutting edge 8 is set to about 3 °.

  On the other hand, as shown in FIG. 5, the second plate member 6 has substantially the same shape as the first plate member 5, and the left and right sides of the second plate member 6 are the same as the first plate member 5. On both sides, a pair of wide projecting portions 6b are vertically provided, and on the top and bottom of the second plate member 6, a pair of curved portions 6c are formed in a concave shape.

  The second plate member 6 is divided into a first divided body 61 and a second divided body 62 constituting the chip receiving portion 7 at a position substantially in the center in the horizontal direction, and the first divided body 61 and the second divided body 62 are divided. On the split surface side of the split body 62, protrusions 6d and 6e that can be fitted into the assembly hole 5a are provided so as to face each other, and the protrusions 6d and 6e are provided from both sides of the first plate member 5. By fitting into the assembly hole 5a, the second plate member 6 is assembled to the first plate member 5, and the rotating body 10 having a cross shape in a plan view is obtained. The first divided body 61 and the second divided body 62 are assembled so as to sandwich the horizontal center portion of the first plate member 5 corresponding to the portion beyond the rotation center 10a of the cutting blade portion 8 and cut. The center portion in the horizontal direction of the first plate member 5 is not sometimes bent by the load applied to the cutting edge portion 8, so that the center portion of the tip portion 2a of the electrode tip 2 can be reliably cut.

  Then, when the pair of electrode tips 2 are brought close to each other along the rotation center 10a in the rotation state of the rotating body 10, the guide portions 7a guide the tip end side of each electrode tip 2 toward the cutting blade portion 8 side. The cutting blade 8 cuts the outer peripheral portion of each electrode tip tip 2a, and further, the both cutting blades 8 are placed on the respective electrode tip tips 2a in a state where each electrode tip 2 is positioned by the guide portion 7a. The tip 2a is simultaneously cut by contact. In addition, the shavings of the tip 2a of the electrode tip 2 located on the upper side fall downward from between the chip receiving portions 7 so that they do not easily stay above the chip receiving portions 7.

  Next, the cutting of the electrode tip tip 2a by the cutting cutter 1 will be described.

  First, the cutting cutter 1 of the tip dress 9 is rotated by a command from a control panel (not shown). The rotational speed of the cutting cutter 1 is preferably set to about 276 rpm, but other rotational speeds may be set.

  Next, each of the pair of electrode tips 2 is moved to the upper side and the lower side on the other side in the longitudinal direction of the dress body 3, and the center of the tip 2 a of each electrode tip 2 is made to coincide with the rotation center 10 a of the cutting cutter 1.

  Then, the electrode tips 2 are brought close to each other along the rotation center 10a. Then, the guide portion 7a of the rotating cutting cutter 1 guides the tip end side of the electrode tip 2 to the cutting blade portion 8 side, thereby positioning the electrode tip 2. When the tip end of the electrode tip 2 is guided toward the cutting edge portion 8 by the guide portions 7a, the cutting edge portion 8 extending to the guide portion 7a even if the scrap is attached to the outer peripheral portion of the electrode tip end portion 2a. Cuts the outer peripheral portion of the tip portion 2a of the electrode tip and removes the adhesion of shavings. Therefore, it is possible to prevent variation in positioning of the electrode tip 2 due to adhesion of the shavings to the electrode tip 2, and to accurately cut the tip 2a of the electrode tip.

  Thereafter, the cutting blades 8 come into contact with the tip portions 2a of the electrode tips while the cutting cutter 1 is rotated, and the tip portions 2a are simultaneously cut. Then, as shown in FIG. 6, the central portion of the tip portion 2a of the electrode tip is cut by the inclined portion on one side (rotation center 10a side) in the extending direction of the cutting edge portion 8, and a small protrusion 2b is formed at the center of the tip portion 2a. Is formed.

  The protrusion 2b has a protrusion height of about 0.1 to 0.5 mm and does not affect the welding because it disappears due to the pressure applied to the material to be welded during welding.

  Further, the pressing force for bringing the electrode tip tip 2a into contact with the cutting edge 8 is preferably 1.5 kN, and the contact time is preferably set to 1.2 s, but other pressing force and contact time are set. May be.

  As described above, according to the embodiment of the present invention, the cutting edge 8 extends through the rotation center 10 a of the rotating body 10, so that the center axis of the electrode tip 2 is unexpectedly changed to the rotation center 10 a of the rotating body 10. Even if it deviates, the cutting edge portion 8 comes into contact with the center portion of the electrode tip end portion 2a with certainty, and the center portion of the electrode tip end portion 2a can be cut reliably. Moreover, since the periphery of the rotation center 10a of the cutting edge portion 8 is inclined with respect to the central portion of the electrode tip tip portion 2a, the cutting ability of the cutting cutter 1 with respect to the central portion of the electrode tip tip portion 2a increases, and the tip portion of the electrode tip 2a The central part can be cut reliably. Although the protrusion 2b is formed at the center of the tip 2a of the electrode tip after cutting, it does not affect the welding because it disappears due to the pressure applied to the material to be welded during welding.

  In addition, the tip portions 2a of the pair of electrode tips 2 arranged on both sides in the rotation center direction of the rotating body 10 can be cut simultaneously, and the pair of electrode tips 2 can be brought into an appropriate state without lowering the operation rate of the production line.

  Furthermore, since the chrome-based surface treatment is applied to the cutting edge portion 8, the hardness of the cutting edge portion 8 can be increased and the life can be extended.

  In the embodiment of the present invention, a pair of the cutting blade portions 8 is provided on both sides in the rotation center direction of the rotating body 10 in one of the opposed chip receiving portions 7. It may be provided on one end side in the rotation center direction of the rotating body 10 on the side and on the other end side in the rotation center direction of the rotating body 10 on the opposite chip receiving portion 7 side.

  Further, in the embodiment of the present invention, the rotating body 10 includes the four chip receivers 7, but the number of the chip is not limited to four and may be a plurality of chip receivers 7. Preferably it consists of.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a tip dress cutting cutter used for cutting the tip of an electrode tip for spot welding.

DESCRIPTION OF SYMBOLS 1 Cutting cutter 2 Electrode tip 2a Tip part 7 Tip receiving part 7a Guide part 8 Cutting edge part 10 Rotating body 10a Rotation center

Claims (6)

The electrode tip comprises a rotating body that includes a plurality of tip receiving portions that receive the tip of the electrode tip for spot welding, and is provided with a cutting edge in one of the tip receiving portions, and the rotating body is rotated. A cutting cutter for chip dress that cuts the tip of
The plurality of chip receiving portions are integrally connected at one end at the rotation center of the rotating body, the other ends are separated from each other in the rotation direction of the rotating body, and at least two are arranged opposite to both sides of the rotation center of the rotating body. The tip of the electrode tip corresponds to the connecting part on the one end side,
The cutting blade portion is provided on the one of the opposing tip receiving portions, and one side in the extending direction of the cutting blade portion is linearly spaced gradually from the tip end portion of the electrode tip received by each of the tip receiving portions. While extending in the direction of the tip of the tip of the rotating body and extending to the other tip receiving portion while tilting in the shape of the blade, the other side from the midway portion of the cutting blade in the extending direction is received by each tip receiving portion. A cutting cutter for chip dress, which is gently curved so as to correspond to the tip of the electrode tip . It is a cutter for chip dresses according to claim 1,
The cutting edge portions are respectively provided at both ends of the opposing one of the tip receiving portions in the rotation center direction of the rotating body, and the tip ends of the electrode tips disposed on both sides in the rotation center direction of the rotating body are cut into the both cutting edges. A cutting cutter for chip dress, which is designed to cut simultaneously with a blade part. It is a cutter for chip dresses according to claim 1,
The cutting edge portion is provided at one end side in the rotation center direction of the rotating body on the one opposing chip receiving portion side, and the other end in the rotation center direction of the rotating body on the other opposing chip receiving portion side A tip-dressing cutting cutter, characterized in that the tip portions of electrode tips provided on the side and disposed on both sides in the rotational center direction of the rotating body are cut simultaneously by the two cutting blade portions. It is a cutter for chip dresses according to any one of claims 1 to 3,
On the other end side of the tip receiving portion, a guide portion is formed so as to extend along the outer peripheral portion of the tip portion of the electrode tip,
The cutting cutter for chip dresses, wherein the cutting edge portion extends to an end portion of the guide portion. It is a cutter for chip dresses according to any one of claims 1 to 4,
A cutter for chip dress, wherein the cutting edge part is subjected to a chromium-based surface treatment. It is a cutter for chip dresses according to any one of claims 1 to 5,
The cutting edge portion is formed with a clearance angle that is linearly inclined so as to be separated from the tip portion of the electrode tip toward the opposite side of the rotating direction of the rotating body. A cutter for chip dress, characterized in that it extends perpendicular to the direction of rotation.

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