JPWO2016116964A1 - Cutting cutter for chip dress - Google Patents

Abstract

There is provided a cutting cutter for chip dress capable of efficiently performing cutting work by surely rounding chips and preventing them from getting entangled with the apparatus. A cutting plate (4) having a cutting edge (4b) is attached to the holder (3). The cutting plate (4) is attached with a breaker (5) for guiding the chips discharged when the electrode tip (2) is cut to bend in a predetermined direction. The part corresponding to the cutting edge part (4b) of the breaker (5) has a chip guide surface (5e) extending along the extending direction of the cutting edge part (4b) with a predetermined distance D from the cutting edge part (4b). ) Is formed.

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 the adhesion of an oxide film, etc., so the tip is periodically cut using a tip dress. There is a need.

  By the way, the chips generated when cutting the tip of the electrode tip may get entangled in the device when it is cut out, so it is reduced by bending and rounding immediately after being cut out by a part called a breaker. It is performed to avoid tangling.

  For example, a cutting cutter for chip dress disclosed in Patent Document 1 includes a substantially C-shaped holder in a plan view in which a rotation axis extends in the vertical direction. The holder is formed with a notch recess that opens to the outside and extends in the up-down direction and opens at both the upper and lower sides, and an attachment surface that extends along the longitudinal direction of the holder is formed on the inner surface of the notch recess. ing. The upper and lower surfaces of the holder are formed with a pair of curved surface portions that gradually reduce in diameter toward the central portion of the holder, and the shape of each curved surface portion is an electrode chip in which the central axis coincides with the rotation axis of the holder It corresponds to the shape of the tip. A cutting plate having a pair of cutting edge portions corresponding to the shape of each curved surface portion is attached to the attachment surface. Further, a rectangular or circular breaker is attached to the opposite side of the holder in the cutting plate. The breaker is screwed to the mounting surface together with the cutting plate with a screw, and an inclined surface gradually formed on the cutting plate side as the distance from the center of the breaker increases. Then, by rotating the holder while receiving the tip portion of the electrode tip at each of the curved surface portions, the tip portion of the electrode tip was cut by the cutting blade portion of the cutting plate, and was cut out by the cutting blade portion. The chips are bent and rounded along the inclined surface of the breaker.

International Publication No. 2013/061710

  By the way, the shape of the breaker disclosed in Patent Document 1 is rectangular or circular. On the other hand, the cutting blade portion of the cutting plate is curved so as to gradually move away from the breaker. The chip to be machined is bent while contacting only the portion closest to the cutting edge portion on the inclined surface of the breaker. Therefore, when the chip is bent and rounded, the chips come into contact with the inclined surface of the breaker while slid while touching the line, so that the load may be excessively applied to the sliding part and may be separated during bending. There is. If it does so, a chip | tip will be discharged | emitted with big shape, without being small, and there exists a possibility that it may get entangled with an apparatus and stop subsequent cutting work.

  The present invention has been made in view of such a point, and the object of the present invention is for a chip dress that can efficiently perform a cutting operation by surely rounding off chips and preventing them from getting entangled with the apparatus. It is to provide a cutting cutter.

  In order to achieve the above object, the present invention is characterized in that the shape of the breaker is devised.

  Specifically, a rotating body having one or more tip receiving portions for receiving the tip of the electrode tip for spot welding, and attached to the rotating body and extending in a direction intersecting with the rotation axis of the rotating body. When the rotating body is rotated with one or more cutting blade portions and the tip portion of the electrode tip received by the tip receiving portion, the cutting blade portion cuts the tip portion of the electrode tip. A chip dress cutting cutter comprising a cutting plate and a breaker that is attached to the cutting plate and guides the chips discharged when the electrode tip is cut by the cutting plate to bend in a predetermined direction. The solution was taken.

  That is, in the first invention, the portion corresponding to the cutting edge portion of the breaker is provided with one or more chip guides extending along the extending direction of the cutting edge portion at a predetermined interval from the cutting edge portion. A surface is formed.

  In a second invention, in the first invention, two chip receiving portions are provided so as to face opposite sides in the extending direction of the rotation axis of the rotating body, and each chip receiving portion is Each of the cutting edge portions is provided so as to correspond to each of the tip receiving portions, and the inclined guide surface is configured to receive each of the cutting edge portions. Two are provided so as to correspond to the above.

  In 3rd invention, in the 1st or 2nd invention, the said cutting plate is attached to the said rotary body so that the plate | board thickness direction may correspond to the rotation direction of the said rotary body, The said breaker is the said cutting plate The outer peripheral shape of the cutting plate is attached to the opposite side of the rotating body, and the outer peripheral shape thereof is the same as or similar to the outer peripheral shape of the cutting plate.

  In the first invention, since the distance between the cutting blade portion of the cutting plate and the chip guide surface of the breaker is constant, the chips cut out by the cutting blade portion are slid evenly over the entire area of the chip guide surface of the breaker. It can be bent while touching. Therefore, when the chips are bent by the breaker, the load applied to the chips is biased and the chips are separated, thereby preventing the chips from getting entangled with the device without being reduced, thereby making the cutting work efficient. Can be done.

  In the second invention, even in a special process in which welding is performed using two different types of electrode tips, the tip of each electrode tip can be cut with one cutting cutter. It can be a low-cost cutting cutter. Further, only one breaker is prepared to prevent the chips generated from each electrode chip from getting entangled in the apparatus, and it is not necessary to prepare one breaker corresponding to each of two different types of electrode chips. The cost can be kept low by reducing the number of parts.

  In 3rd invention, when a cutting plate and a breaker are attached to a rotary body, a breaker will come to cover the substantially whole region on the opposite side of the rotary body in a cutting plate. Accordingly, the rigidity around the cutting plate in the rotating body is increased, and deformation and breakage of the cutting plate can be prevented even if a large force is unexpectedly applied to the cutting plate during the cutting operation.

It is a perspective view of the cutting cutter which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the cutting cutter which concerns on Embodiment 1 of this invention. It is A arrow directional view of FIG. FIG. 4 is a view corresponding to FIG. 3 according to Embodiment 2 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.
Embodiment 1 of the Invention
1 and 2 show a cutting cutter 1 according to Embodiment 1 of the present invention. This cutting cutter 1 is used, for example, by being attached to a tip dress disclosed in International Publication No. 2013/061710 in order to cut the tip 2a of the electrode tip 2 for spot welding.

  The cutting cutter 1 includes a metal holder 3 (rotary body) having a substantially C shape that is wide in a plan view and a short column shape in the vertical direction, and the holder 3 is driven by rotation of a drive motor (not shown). 3 is rotated around a rotation axis C extending in the vertical direction at the center position 3.

  A cutout recess 31 is formed on one side of the holder 3 in the longitudinal direction and is open outward and extends in the vertical direction and open to both the top and bottom sides. The cutout recess 31 is cut out in a substantially fan shape in plan view. It has a different shape.

  The holder 3 is formed with a pair of curved surface portions 32 (chip receiving portions) that gradually decrease in diameter toward the central portion of the holder 3 so as to face upward and downward, respectively.

  That is, the curved surface portions 32 face opposite to each other in the extending direction of the rotation axis C.

  The shape of the curved surface portion 32 corresponds to the shape of the tip portion 2a of the electrode tip 2 whose center axis coincides with the rotation axis C of the holder 3, and can receive the tip portion 2a. Yes.

  As shown in FIG. 2, an attachment surface 33 extending along the longitudinal direction of the holder 3 is provided on the inner surface of the notch recess 31, and the attachment surface 33 has a substantially triangular shape in a side view. .

  In the center of the mounting surface 33, a fastening hole 33a is formed in which an internal thread is threaded on the inner peripheral surface.

  Further, a block-shaped first positioning projection 34 projects from the mounting surface 33 on the rotation axis C side.

  An upper projecting portion 35 and a lower projecting portion 36 that project outward are formed on the upper edge portion and the lower edge portion on one side in the longitudinal direction of the holder 3, respectively.

  The mounting surface 33 side of the upper overhanging portion 35 protrudes from the mounting surface 33, and the portion constitutes a second positioning projection 35a.

  Further, the mounting surface 33 side of the lower projecting portion 36 also protrudes from the mounting surface 33 so as to correspond to the second positioning projection 35a, and this portion constitutes the third positioning projection 36a. .

  On the other hand, the upper ridge portion 37 and the lower ridge portion that protrude outwardly and extend in the horizontal direction intersecting the longitudinal direction of the holder 3 are formed on the upper edge portion and the lower edge portion on the other side in the longitudinal direction of the holder 3. 38 is formed, and a semicircular recess 37 a that opens outward is formed in the middle of the upper protrusion 37.

  A substantially triangular metal cutting plate 4 for cutting the tip portion 2 a of the electrode tip 2 is attached to the attachment surface 33 in a posture in which the plate thickness direction coincides with the rotation direction of the holder 3. Yes.

  Positioning recesses 4a and 4e each having a shape cut out in a rectangular shape in a side view are formed on the upper and lower portions on one side in the longitudinal direction of the cutting plate 4, respectively.

  On the other hand, cutting edges 4b are formed on the upper edge and the lower edge on the other longitudinal side of the cutting plate 4, and each cutting edge 4b attaches the cutting plate 4 to the attachment surface 33. In the above state, a curved shape corresponding to each curved surface portion 32 is formed.

  A mounting hole 4c is formed through the center of the cutting plate 4, and one end in the longitudinal direction of the cutting plate 4 extends horizontally from the mounting hole 4c on one side in the longitudinal direction of the cutting plate 4. A slit 4d is formed in the opening.

  Then, the other longitudinal end of the cutting plate 4 is directed to the first positioning projection 34, the second positioning projection 35a is fitted into the positioning recess 4a, and the third positioning projection 36a is positioned. By fitting into the recess 4e, the position of the cutting plate 4 with respect to the mounting surface 33 is determined, and the mounting hole 4c corresponds to the fastening hole 33a.

  A breaker 5 having a substantially triangular plate shape is attached to the flat surface on the opposite side of the holder 3 in the cutting plate 4, and the outer peripheral shape of the breaker 5 is the outer peripheral shape of the cutting plate 4 as shown in FIG. And approximate.

  A through hole 5a corresponding to the mounting hole 4c of the cutting plate 4 is formed in the center of the breaker, and a counterbore hole 5b is formed around the through hole 5a.

  Further, on one side in the longitudinal direction of the breaker 5, notch recesses 5c and 5d corresponding to the positioning recesses 4a and 4e of the cutting plate 4 are formed.

  Further, on the other side in the longitudinal direction of the breaker 5 and in a portion corresponding to each of the cutting blade portions 4b, a predetermined distance D is provided from each of the cutting blade portions 4b in the extending direction of the cutting blade portion 4b. A pair of chip guide surfaces 5e extending along the surface is formed.

  Each of the chip guide surfaces 5e is inclined so as to be gradually positioned on the cutting plate 4 side as the distance from the center of the breaker 5 is increased, and the two chip guide surfaces 5e gradually approach the other longitudinal side of the breaker 5. By connecting them, they have a sharp shape.

  The cutting plate 4 and the breaker 5 are attached to the attachment surface 33 with screws 6.

  The screw 6 is a Torx (registered trademark) screw composed of a head 6a and a shaft portion 6b in which a male screw is threaded on the outer peripheral surface, and the surface of the head 6a goes to the opposite side in the tightening direction. It has a gently curved shape that gradually decreases in diameter.

  Then, the cutting plate 4 is addressed to the mounting surface 33 of the holder 3, the breaker 5 is addressed to the flat surface opposite to the holder 3 of the cutting plate 4, and the shaft portion 6 b of the screw 6 is By passing through the through hole 5a of the breaker 5 and the mounting hole 4c of the cutting plate 4 in order and screwing into the fastening hole 33a of the holder 3, the cutting plate 4 and the breaker 5 are fastened to the mounting surface 33 together. It can be attached.

  Further, the holder 3 is moved around the rotation axis C with the cutting plate 4 and the breaker 5 attached to the holder 3 and with the tip 2a of the electrode tip 2 received by the curved surface portion 32. By rotating, the cutting edge 4b of the cutting plate 4 cuts the tip 2a of the electrode tip 2.

  Furthermore, the breaker 5 guides the chips discharged when the tip 2a of the electrode tip 2 is cut by the cutting plate 4 to bend in a predetermined direction (see arrow X1 in FIG. 1).

  Next, the operation | work which cuts the front-end | tip part 2a of the electrode tip 2 with the cutting cutter 1 is demonstrated.

  First, a chip dress drive motor (not shown) is driven to rotate to rotate the cutting cutter 1 mounted on the chip dress around the rotation axis C.

  Next, the electrode tip 2 is moved above and below the cutting cutter 1, and the center axis of both electrode tips 2 is aligned with the rotational axis C of the cutting cutter 1.

  Thereafter, each electrode tip 2 is brought close to each curved surface portion 32 of the holder 3 along the rotation axis C. Then, each curved surface portion 32 receives the tip portion 2a of each electrode tip 2, and each cutting edge portion 4b of the cutting plate 4 contacts the tip portion 2a of each electrode tip 2 to cut the tip portion 2a. . At this time, as shown by an arrow X1 in FIG. 1, the chips cut out by the cutting edge portion 4b are bent by the inclination of the chip guide surface 5e and rounded to a small extent. It is possible to prevent the cutting operation from being stopped.

  Further, since the distance D between the cutting edge portion 4b of the cutting plate 4 and the chip guide surface 5e of the breaker 5 is constant, the chips cut out by the cutting edge portion 4b extend over the entire area of the chip guide surface 5e of the breaker 5. It can be bent while sliding without bias. Therefore, when the chips are bent by the breaker 5, it is possible to avoid that the load applied to the chips is biased and the chips are separated, thereby preventing the chips from becoming entangled with the apparatus without being reduced, thereby making the cutting work efficient. Can be done automatically.

Further, when the cutting plate 4 and the breaker 5 are attached to the holder 3, the breaker 5 covers substantially the entire area of the cutting plate 4 opposite to the holder 3, so that the rigidity around the cutting plate 4 is increased and the cutting is performed. Even if a large force is unexpectedly applied to the cutting plate 4 during operation, the cutting plate 4 can be prevented from being deformed or damaged.
<< Embodiment 2 of the Invention >>
FIG. 4 shows Embodiment 2 of the present invention. In the second embodiment, the shape of the lower curved surface portion 32 is different from that of the first embodiment, and only the partial shapes of the cutting plate 4 and the breaker 5 are different accordingly. Only parts different from the first embodiment will be described in detail.

  In the second embodiment, the tip portions 2a of two different types of electrode tips 2 (hereinafter referred to as electrode tips 2A and 2B) can be cut. The tip 2a of the electrode tip 2A has a shape larger than the diameter of the tip 2a of the electrode tip 2B. The lower curved surface portion 32 of the holder 3 is curved more gently than the upper curved surface portion 32, the lower curved surface portion 32 is the tip 2a of the electrode tip 2A, and the upper curved surface portion 32 is the electrode. The tip 2a of the chip 2B can be received.

  Each cutting edge portion 4b in the cutting plate 4 of the second embodiment has a shape corresponding to each curved surface portion 32 described above.

  Further, each chip guide surface 5e in the breaker 5 of the second embodiment has a shape corresponding to each of the above-described cutting blade portions 4b.

  In addition, the operation | work which cuts the front-end | tip part 2a of the electrode tip 2 with the cutting cutter 1 in Embodiment 2 receives the front-end | tip part 2a of the electrode tip 2 from which a kind differs in the upper curved surface part 32 and the lower curved surface part 32. Since it is the same as that of Embodiment 1 except cutting, detailed description is abbreviate | omitted.

  As described above, according to the second embodiment of the present invention, the tip 2a of each electrode tip 2 is cut by one cutting cutter 1 even in a special process of welding using two different types of electrode tips 2. Therefore, the cutting cutter 1 can be made flexible and at low cost. Further, only one breaker 5 is prepared to prevent the chips generated from each electrode chip 2 from getting entangled in the apparatus, and one breaker 5 corresponding to each of two different types of electrode chips 2 is prepared. It is not necessary to reduce the number of parts and the cost can be reduced.

  In the first and second embodiments of the present invention, the breaker 5 is made of metal, but may be made of resin.

  In the first and second embodiments of the present invention, the screw 6 is a Torx screw. However, the present invention is not limited to this, and other types of screws may be used as long as the cutting plate 4 and the breaker 5 can be fastened to the mounting surface 33 of the holder 3. A screw may be used.

  Further, according to the first and second embodiments of the present invention, the breaker 5 is attached to the cutting plate 4 by screwing the shaft portion 6 b of the screw 6 into the fastening hole 33 a of the holder 3. The breaker 5 may be attached to the cutting plate 4 by screwing the portion 6b to the cutting plate 4, and the shaft portion 6b of the screw 6 is screwed to at least one of the holder 3 and the cutting plate 4 so that the breaker 5 is screwed. What is necessary is just to make it attach to the cutting plate 4. FIG.

  In addition, in Embodiments 1 and 2 of the present invention, the outer peripheral shape of the breaker 5 is approximated to the outer peripheral shape of the cutting plate 4, but the outer peripheral shape of the breaker 5 is made the same as the outer peripheral shape of the cutting plate 4. Good.

  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, 2A, 2B Electrode tip 2a Tip part 3 Holder (rotating body)
4 Cutting plate 5 Breaker 5e Chip guide surface 32 Curved surface part (chip receiving part)

Claims (3)

A rotating body having one or more tip receiving portions for receiving the tip portion of the electrode tip for spot welding;
One or more cutting blades attached to the rotating body and extending in a direction intersecting with the rotational axis of the rotating body, and the tip of the electrode tip is received by the tip receiving part. A cutting plate that cuts the tip of the electrode tip when the rotating body is rotated;
A cutting cutter for chip dress provided with a breaker attached to the cutting plate and guiding the chips discharged when cutting the electrode tip by the cutting plate to bend in a predetermined direction,
The part corresponding to the cutting edge part of the breaker is formed with one or more chip guide surfaces extending along the extending direction of the cutting edge part at a predetermined interval from the cutting edge part. A cutting cutter for chip dress. In the cutting cutter for chip dresses according to claim 1,
Two tip receiving portions are provided so as to face opposite sides in the extending direction of the rotation axis of the rotating body, and each of the tip receiving portions includes two electrode tips having different tip shapes. Configured to receive,
Two of the cutting blade portions are provided so as to correspond to the chip receiving portions,
Two of the inclined guide surfaces are provided so as to correspond to the respective cutting edge portions, and the cutting cutter for chip dresses. In the cutting cutter for chip dresses according to claim 1 or 2,
The cutting plate is attached to the rotating body such that the plate thickness direction coincides with the rotating direction of the rotating body,
The chip dressing cutting cutter, wherein the breaker is attached to the opposite side of the rotating body in the cutting plate, and an outer peripheral shape thereof is the same as or similar to an outer peripheral shape of the cutting plate.

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