JP2010179318A - Multi-spot welding electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-spot welding electrode which is improved in workability without needing the preparation of a large number of multi-spot welding electrodes varied in the pitch of a shank. <P>SOLUTION: With a fitting recess 3a fitted to a fitting projection 2b, each sliding shank 3 is freely slidably mounted on a body 2. In the base of each sliding shank 3, there is formed a screw hole 3b communicating with the fitting recess 3a. A fixing screw 9 is screwed onto each screw hole 3b, with each sliding shank 3 fixed to the body 2. As a result, by merely loosening the fixing screw 9, the pitch of each sliding shank 3 can be varied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-point electrode apparatus capable of spot-welding multiple points simultaneously on an object to be welded.

  2. Description of the Related Art Conventionally, spot welding is widely used as one means for welding metal members, in which a current is passed between electrodes facing each other while a member to be welded is crimped, and the metal is melted and joined by the resistance heat. Recently, for the purpose of increasing the efficiency of welding work, a multi-point electrode apparatus capable of simultaneously welding multiple points as shown in Patent Document 1 has been used.

  As shown in FIG. 6, such a multi-point electrode device 50 has a plurality of shanks 52 attached in parallel to the tip of a block-like fixing member 51, and an electrode 53 attached to the tips of these shanks 52. It is a thing of composition.

JP 2003-80371 A

  Depending on the welding location, in order to avoid interference with the work piece or jig, welding was performed by replacing the multi-point electrode device 50 in which the pitches (separation dimensions) of the plurality of shanks 52 were changed to a spot welder. . However, in such a method, it is necessary to prepare a large number of multi-point electrodes having different pitches of the plurality of shanks 52, and the trouble of replacing the multi-point electrode device 50 with a spot welder occurs. Therefore, workability was getting worse. An object of the present invention is to solve the above-mentioned problems and to provide a multi-point electrode having improved workability without the need to prepare a large number of multi-point electrodes having different shank pitches.

In order to solve the above-mentioned problem, the invention according to claim 1 is such that a plurality of electrodes adjacent in parallel are pressed against a member to be welded, and a current is passed through the electrodes to simultaneously spot weld a plurality of dots. In the multi-point electrode device for
A main body attached to the spot welder;
It consists of a plurality of sliding shanks that attach electrodes to its tip,
A fitting protrusion that is wide in the protruding direction is formed at the tip of the main body,
Each sliding shank base is formed with a fitting recess that opens to the proximal end of the sliding shank in a shape corresponding to the fitting protrusion.
The fitting recess is fitted to the fitting projection, and each sliding shank is slidably attached to the main body,
A screw hole communicating with the fitting recess is formed at the base of each sliding shank,
Each sliding shank is fixed to the main body by a fixing screw screwed into each screw hole.

The invention according to claim 2 is the invention according to claim 1, wherein a sandwiching member is sandwiched between the fitting convex portion and the fitting concave portion at the position where the fixing screw advances,
Each of the sliding shanks is fixed to the main body by pressing the clamping member with a fixing screw.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the main body is composed of a fixing member attached to the spot welder, and a tilting member formed with a fitting convex portion,
Forming a receiving recess at the tip of the fixing member;
At the base end of the tilting member, a mounting portion that is received by the receiving recess is formed,
With the mounting portion received in the receiving recess, the shaft member is inserted into the shaft support hole communicating with the tip of the fixing member and the mounting portion, and the tilting member is tiltably mounted on the fixing member. It is characterized by that.

The invention according to claim 4 is the invention according to claim 3,
The bottom surface of the receiving recess and the base end surface of the mounting portion are arc surfaces having the same radius of curvature, and the bottom surface and the base end surface are brought into close contact with each other,
The inner diameter of the shaft support hole formed in the attachment portion is made larger than the outer diameter of the shaft member, and the tilt member is attached to the fixed member so as to be tiltable.

According to the first aspect of the present invention, a fitting convex portion that is wide in the protruding direction is formed at the tip of the main body, and each sliding shank base has a shape corresponding to the fitting convex portion, and is slid. A fitting recess is formed at the base end of the moving shank, the fitting recess is fitted to the fitting projection, and each sliding shank is slidably attached to the main body. A screw hole communicating with the fitting recess is formed in the base portion of the shank, and each sliding shank is fixed to the main body by a fixing screw screwed into each screw hole.
For this reason, it is possible to change the pitch of a plurality of sliding shanks by simply loosening the fixing screw, and it is not necessary to prepare a large number of multi-point electrode devices with different shank pitches. There is no need to change to a spot welder, and workability is improved.

According to the second aspect of the present invention, a sandwiching member is sandwiched between the fitting convex portion at which the fixing screw advances and each fitting concave portion, and the sandwiching member is pressed with the fixing screw. The sliding shank is fixed to the main body.
For this reason, the fixing screw presses the clamping member, and the fitting convex part is uniformly pressed by the clamping member, so that the sliding shank is securely fixed to the fitting convex part and slides during spot welding. The shank never moves.
In addition, since the fitting convex part is uniformly pressed by the sandwiching member, the fitting convex part and the fitting concave part are in reliable contact, and during the spot welding, the sliding shank is reliably energized and energized. Welding failure due to defects does not occur.
Further, since the clamping member presses the fitting convex portion, the fitting convex portion is not damaged and the sliding shank is not fitted to the fitting convex portion as compared with the structure in which the fixing screw directly presses the fitting convex portion. It is not possible to slide on the part.

According to a third aspect of the present invention, the main body is composed of a fixing member attached to the spot welder and a tilting member formed with a fitting convex portion, and a receiving concave portion is formed as a recess at the tip of the fixing member. A mounting portion that is received in the receiving recess is formed at the base end of the tilting member, and the shaft that communicates the distal end of the fixing member and the mounting portion in a state where the mounting portion is received in the receiving recess. The shaft member is inserted into the hole, and the tilt member is attached to the fixed member so as to be tiltable.
For this reason, even if the surface of the work piece is not completely smooth and has slight irregularities or a curved surface, the tilting member tilts around the shaft member, and a plurality of sliding shanks are formed. It is possible for the electrode attached to the electrode to be in full contact with the surface of the work piece, pressurize the work piece evenly, and prevent the occurrence of poor welding.

According to a fourth aspect of the present invention, the bottom surface of the receiving recess and the base end surface of the mounting portion are arc surfaces having the same radius of curvature, and the bottom surface and the base end surface are brought into close contact with each other. The inner diameter is larger than the outer diameter of the shaft member, and the tilt member is attached to the fixed member so as to be tiltable.
For this reason, even if the tilting member tilts with respect to the fixed member, the bottom surface and the base end surface are completely in contact with each other during welding, and current flows reliably from the fixed member to the tilted member. It is possible to prevent the occurrence of poor welding due to the fact that no current flows.

It is a 3rd page figure of the multi-point electrode device which shows an embodiment of the invention. It is a 3rd view of a fixing member. It is the front view and side view of a tilting member. It is a 3rd page figure of a sliding shank. It is the 3rd page figure and perspective view of an insertion member. It is explanatory drawing of the conventional 2-point hitting.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a trihedral view of a multi-point electrode 20 of the present invention. The multi-point electrode 20 of the present invention is mainly composed of a main body (consisting of a fixing member 1 and a tilting member 2), a plurality of sliding shanks 3, a plurality of electrodes 4, and a plurality of sandwiching members 5. . These fixing member 1, tilting member 2, sliding shank 3, electrode 4, and sandwiching member 5 are made of a copper alloy such as chrome copper or beryllium copper having good conductivity.

  The fixing member 1 is attached to a spot welder. The tilt member 2 is attached to the fixed member 1 so as to be tiltable. The plurality of shanks 3 are slidably attached to the tilting member 2, and an electrode 4 is attached to the tip thereof. Hereinafter, the multi-point electrode device 20 of the present invention will be described in detail.

  FIG. 2 shows an overall view of the fixing member 1, and the fixing member 1 will be described. As shown in FIG. 2, the fixing member 1 includes a block-shaped support portion 1a and a mounting portion 1b protruding from the base end of the support portion 1a. The attachment portion 1b is attached to a spot welder, and current is supplied from the spot welder during welding. A cooling water hole 1c is formed in the attachment portion 1b so as to open to the tip of the attachment portion 1b. The cooling water hole 1c is formed up to the inside of the support portion 1a. Cooling water is supplied from the spot welder to the cooling water hole 1c so that the fixing member 1 is not overheated.

  A receiving recess 1d is formed at the tip of the support portion 1a. The bottom surface 1e of the receiving recess 1d is an arc surface having a circular cross section. Support walls 1f are formed on both sides of the receiving recess 1d (on the front side and the back side in FIG. 2B). A shaft support hole 1g is formed in communication with substantially the center of both support walls 1f.

  The front and side views of the tilting member 2 are shown in FIG. 3, and the tilting member 2 will be described. As shown in FIG. 3, a block-shaped mounting portion 2a and a dovetail-shaped fitting convex portion 2b protruding from the tip surface of the mounting portion 2a are integrally formed. The base end of the attachment portion 2a bulges out in an arc shape. The base end surface 2c of the mounting portion 2a is a circular arc surface having a circular cross section. The radius of curvature of the base end surface 2c is the same as the radius of curvature of the bottom surface 1e of the receiving recess 1d.

  A shaft support hole 2d is formed in communication with the approximate center of the mounting portion 2a. The inner diameter of the shaft support hole 2 d is larger than the inner diameter of the shaft support hole 1 g of the fixing member 1.

  The fitting convex portion 2b is wide in the protruding direction, and both side surfaces of the fitting convex portion 2b are tapered surfaces 2e and 2f. In the embodiment shown in the figure, the tapered surfaces 2e and 2f are flat surfaces, but may be curved surfaces such as circular arc surfaces. In the embodiment shown in the figure, the upper surface of the fitting convex portion 2b is a flat surface, but it may be a curved surface such as an arc surface.

  As shown in FIG. 1, the mounting portion 2a of the tilting member 2 is received in the receiving recess 1d of the fixing member 1 so that the base end surface 2c and the bottom surface 1e are in close contact with each other. The shaft member 7 is inserted into the shaft support hole 2 d of the tilt member 2, and the tilt member 2 is pivotally supported and attached to the fixed member 1. In the embodiment shown in the figure, a hexagonal hole is formed at the base end of the shaft member 7, and a screw thread is threaded at the tip of the shaft member 7, and a nut 8 is fastened to the screw thread. Thus, the shaft member 7 is prevented from falling off the fixing member 1.

  The inner diameter of the shaft support hole 1g is only slightly larger than the outer diameter of the shaft member 7, and there is almost no clearance between the shaft support hole 1g and the shaft member 7, whereas the inner diameter of the shaft support hole 2d is Has a clearance larger than the outer diameter of the shaft member 7. By this clearance, the tilting member 2 can be tilted slightly with respect to the fixed member 1.

  Note that there is almost no clearance between the support wall 1f of the fixing member 1 and the support portion 2a of the tilting member 2, and the movement of the tilting member 2 toward the front side (in FIG. 1B) with respect to the fixing member 1. The tilting member 2 is supported by the fixed member 1.

  FIG. 4 shows a three-sided view of the sliding shank 3, and the sliding shank 3 will be described. At the base of the sliding shank 3, a dovetail-shaped fitting recess 3 a that opens to the base end of the sliding shank 3 is formed. The cross section of the fitting recess 3 a has a shape corresponding to the cross section of the fitting protrusion 2 b formed on the tilting member 2. That is, the fitting recess 3 a is wider toward the distal end side of the sliding shank 3.

  At the base of the sliding shank 3, a screw hole 3b communicating with the fitting recess 3a is formed.

  The tip of the sliding shank 3 is an electrode mounting portion 3c. The electrode attachment portion 3c has an outer diameter that gradually decreases toward the tip side. As shown in FIG. 1, the electrode 4 is attached to the electrode attachment portion 3c.

  The sliding shank 3 is formed with a cooling water passage 3d that opens to the electrode mounting portion 3c. The sliding shank 3 is formed with a cooling water inflow passage 3e that opens to the outer surface of the sliding shank 3 and communicates with the cooling water passage 3d. A cooling water circulation pipe 6 is disposed inside the cooling water flow path 3d. The cooling water flow pipe 6 is attached to the proximal end of the cooling water flow path 3d and extends to the opening of the cooling water flow path 3d. The sliding shank 3 is formed with a cooling water outflow passage 3f that communicates from the outer surface of the sliding shank 3 to the cooling water passage 3d. The cooling water flows from the cooling water inflow passage 3e through the cooling water flow pipe 6 and cools the electrode 4, and then flows outside the cooling water flow pipe 6 (cooling water flow path 3d) from the cooling water outflow path 3f. It is supposed to be discharged.

  As shown in FIG. 1, the fitting recess 3 a of the sliding shank 3 is fitted with the fitting projection 2 b of the tilting member 2. For this reason, the sliding shank 3 is slidable with respect to the tilting member 2 in a direction orthogonal to the pressing direction. In addition, since the fitting convex part 2b is wide toward the protrusion direction, and the fitting recessed part 3a becomes a shape corresponding to the fitting convex part 2b, the sliding shank 3 is the tilting member 2. It is designed not to fall off. In the embodiment shown in FIG. 1, two sliding shanks 3 are slidably attached to the tilting member 2, but three or more sliding shanks 3 may be attached to the tilting member 2. There is no problem. Adjacent sliding shanks 3 protrude from the fitting protrusion 2 in parallel with each other. Moreover, the electrodes 4 attached to the plurality of sliding shanks 3 are adjacent in parallel.

  In the present embodiment, the inserting member 5 is inserted into the side surface 3g of the fitting recess 3a on the side where the screw hole 3b is formed. In other words, the insertion member 5 is inserted between the fitting convex portion 2b and the fitting concave portion 3a at the position where the tip of the fixing screw 9 advances. As shown in FIG. 5, the sandwiching member 5 is formed by bending both ends of a plate-like pressing surface 5 a to form a bent portion 5 b, and has a “U” cross-sectional shape. The pressing surface 5a is in contact with the side surface 3g of the fitting recess 3a. As shown in FIG. 1, since both of the bent portions 5b hold the proximal end side surface of the sliding shank 3, even if the sliding shank 3 is slid, the sandwiching member 5 does not slide. It is designed not to fall off the dynamic shank 3.

  A fixing screw 9 is screwed into the screw hole 3 b of the sliding shank 3. The distal end of the fixing screw 9 presses the pressing surface 5a of the sandwiching member 5, and the pressing surface 5a presses the tapered surface 2e of the fitting convex portion 2b. Due to the reaction force pressed by the fixing screw 9, the opposite side surface 3h of the fitting recess 3a is pressed against the tapered surface 2f of the fitting projection 2b, and the sliding shank 3 is fitted to the fitting projection 2b of the tilting member 2. It is supposed to be fixed to. In this embodiment, since the fixing screw 9 presses the pressing surface 5a having a large area and the tapered surface 2e of the fitting convex portion 2b is uniformly pressed by the pressing surface 5a, the sliding shank 3 is fitted to the fitting convex portion. 2b is securely fixed to the opposite side surface 3h of the fitting recess 3a and the tapered surface 2f of the fitting projection 2b to ensure contact with the sliding shank 3 from the tilting member 2 during welding. Energized.

  In the present embodiment, the pressing surface 5a having a large area presses the tapered surface 2e of the fitting convex portion 2b, so that the fixing screw 9 directly presses the tapered surface 2e of the fitting convex portion 2a. Thus, the fitting convex portion 2b is not damaged. For this reason, the taper surface 2e of the fitting convex part 2b is damaged, and the sliding shank 3 is prevented from sliding on the fitting convex part 2b.

  When the fixing screw 9 is loosened, the pressing to the tapered surface 2e of the fitting convex portion 2b by the pressing surface 5a is released, and the sliding shank 3 can slide with respect to the sliding protrusion 2b. It can be moved to any position on the sliding protrusion 2b. When the fixing screw 9 is tightened again, the sliding shank 3 can be fixed to the sliding protrusion 2b.

  As shown in FIG. 1, a tube fitting 11 is attached to the opening of the cooling water inflow passage 3e. A tube fitting 12 is attached to the opening of the cooling water outflow passage 3f. A tube fitting 12 of one sliding shank 3 and a tube fitting 11 of the other sliding shank 3 are connected by a flexible tube 13. For this reason, the cooling water which cooled the electrode 4 attached to one sliding shank 3 cools the electrode 4 attached to the other sliding shank 3. Since the tube 13 has flexibility, each sliding shank 3 can be moved on the support part 2b.

  When spot welding is performed, the pair of multi-point electrode devices 20 are attached to the spot welder so as to face each other. Then, the electrode 4 facing the member to be welded is pressed and contacted, and a current is passed through the electrode 4 to simultaneously perform spot welding at a plurality of spots.

  In the present invention, since the sliding shank 3 is slidably attached to the tilting member 2, the fixing screw 9 is loosened and the sliding shank 3 is moved relative to the tilting member 2 without replacing the multi-point electrode device itself. By simply moving to a desired position and tightening the fixing screw 9, it becomes possible to avoid interference with the workpiece or jig, and workability is improved. In order to prevent an excessive load from acting on one sliding shank 3 during welding, the horizontal position of one sliding shank 3 and the other sliding shank 3 is set to tilt the tilting member 2. It must be located at an equal distance from the center (that is, the position of the shaft member 7). In the present invention, since all the sliding shanks 3 are slidably attached to the tilting member 2, the horizontal position of the sliding shank 3 can be positioned at an equal distance from the tilting center of the tilting member 2. It is possible.

  In the present embodiment, since the tilting member 2 to which the sliding shank 3 is attached is attached to the fixing member 1 so as to be tiltable, the surface of the workpiece is not a perfect smooth surface, and there are slight irregularities. Even if it is a curved surface, the tilting member 2 tilts about the shaft member 7, and the two electrodes 4 attached to the two sliding shanks 3 are completely on the surface of the workpiece. It is possible to prevent the occurrence of poor welding by contacting and pressurizing the workpieces evenly.

  In the present embodiment, the curvature radius of the bottom surface 1 e formed on the fixing member 1 and the curvature radius of the base end surface 2 c formed on the tilting member 2 are the same. Even when tilted, the bottom surface 1e and the base end surface 2c are completely in close contact with each other during welding, and a current flows reliably from the fixing member 1 to the tilting member 2. For this reason, poor welding due to no current flowing from the fixed member 1 to the tilting member 2 does not occur.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The invention can be changed as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and a multi-point electrode device with such a change is also understood to be included in the technical scope. It must be.

DESCRIPTION OF SYMBOLS 1 Fixing member 1a Support part 1b Mounting part 1c Cooling water hole 1d Receiving recessed part 1e Bottom face 1f Support wall 1g Shaft support hole 2 Tilt member 2a Mounting part 2b Fitting convex part 2c Base end surface 2d Shaft support hole 2e Tapered surface 2f Tapered surface 3 Sliding shank 3a Fitting recess 3b Screw hole 3c Electrode mounting part 3d Cooling water flow path 3e Cooling water inflow path 3f Cooling water outflow path 3g Side surface of fitting recess 3h Side surface opposite to fitting recess 4 Electrode 5 Inserting member 5a Pressing surface 5b bent portion 6 cooling water flow pipe 7 shaft member 8 nut 9 fixing screw 11 tube fitting 12 tube fitting 13 tube 20 multi-point electrode device 50 conventional multi-point electrode device 51 fixing member 52 shank 53 electrode

Claims (4)

In a multi-point electrode apparatus for making a welded member press-contact a plurality of adjacent electrodes in parallel and passing a current to the electrodes to simultaneously spot weld a plurality of spots,
A main body attached to the spot welder;
It consists of a plurality of sliding shanks that attach electrodes to its tip,
A fitting protrusion that is wide in the protruding direction is formed at the tip of the main body,
Each sliding shank base is formed with a fitting recess that opens to the proximal end of the sliding shank in a shape corresponding to the fitting protrusion.
The fitting recess is fitted to the fitting projection, and each sliding shank is slidably attached to the main body,
A screw hole communicating with the fitting recess is formed at the base of each sliding shank,
The multi-point hitting electrode device, wherein each sliding shank is fixed to the main body by a fixing screw screwed into each screw hole. Between the fitting convex part and the fitting concave part at the position where the fixing screw advances, the inserting member is inserted,
2. The multi-point electrode device according to claim 1, wherein each of the sliding shanks is fixed to the main body by pressing the clamping member with a fixing screw. The main body is composed of a fixing member attached to the spot welder and a tilting member on which a fitting convex portion is formed,
Forming a receiving recess at the tip of the fixing member;
At the base end of the tilting member, a mounting portion that is received by the receiving recess is formed,
With the mounting portion received in the receiving recess, the shaft member is inserted into the shaft support hole communicating with the tip of the fixing member and the mounting portion, and the tilting member is tiltably mounted on the fixing member. The multi-point electrode device according to claim 1 or 2, wherein the multi-point electrode device is provided. The bottom surface of the receiving recess and the base end surface of the mounting portion are arc surfaces having the same radius of curvature, and the bottom surface and the base end surface are brought into close contact with each other,
The multi-point hitting electrode device according to claim 3, wherein the inner diameter of the shaft support hole formed in the mounting portion is larger than the outer diameter of the shaft member, and the tilting member is tiltably mounted on the fixed member. .

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