JP2009183996A - Arm structure of welding gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arm structure of a welding gun which is less likely to cause damage to a cooling water pipe and has an excellent cooling function by fixing the cooling water pipe to a hollow portion in an arm made of light alloy. <P>SOLUTION: The arm structure of a welding gun includes welding gun arms 3, 5 made of a light alloy having the hollow portion 13 extended in a longitudinal direction and formed by extrusion. In this arm structure, a pair of U-shaped grooves 17, 18 are provided for inserting and mounting cooling water pipes 15, 16 into a longitudinal inner wall 14 in the hollow portion. Along the grooves 17, 18, small grooves 19, 20 and strip-shaped tongues 21, 22 are formed. The strip-shaped tongues are deformed by caulking to fix the cooling water pipes 15 and 16 on the inner wall of the hollow portion. In some cases, two pairs of U-shaped grooves are provided, and one of the two pairs is used as a spare groove for fixing the cooling water pipes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light alloy welding gun arm whose inside is formed into a cavity in the longitudinal direction by extrusion molding, and relates to a structure for fixing and mounting a cooling water pipe for cooling the arm.

  Conventionally, a light alloy welding gun arm whose inside is formed into a cavity in the longitudinal direction by extrusion molding is a cooling water pipe attached to the arm to cool the arm and electrode. (See, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-277664 (see FIG. 5).

By the way, in the arm of the above conventional example, the cooling water pipe of the arm is arranged in a U-shaped holding groove formed on the outer wall surface of the cavity, and this is simply held by a presser at a plurality of positions. In addition, most of the cooling water pipes are exposed to the outside and the presser by the presser may not work equally.

  Such exposure of the cooling water pipe to the outside leads to damage to the cooling water pipe due to spatter during welding work and damage due to interference with other jigs during movement of the welding gun. However, there is a problem that the cooling water pipe is not sufficiently adhered to the arm, and the efficiency of heat exchange with the arm is reduced.

  The present invention has been made in view of the above-described problems of the prior art. The object of the present invention is to provide a cooling water pipe in a cavity formed in a light alloy arm. An object of the present invention is to provide an arm structure of a welding gun which is fixed and is difficult to damage the cooling water pipe and has an excellent cooling function.

  In claim 2, a cooling water pipe is fixed in a cavity formed in a light alloy arm, and the cooling water pipe is hardly damaged, has an excellent cooling function, and has a maintenance arm structure with good maintenance. It is something to be offered.

  According to the third aspect of the present invention, there is provided an arm structure for a welding gun in which the cooling of the arm is further enhanced by air-cooling the arm.

  In order to achieve the above object, the arm structure of a welding gun according to the present invention is provided with a pair of U-shaped grooves for inserting a cooling water pipe on the inner wall in the longitudinal direction of the cavity and a small groove and a band-like tongue along each groove. A strip is formed, and the band-like tongue piece is caulked and deformed to fix the cooling water pipe to the inner wall of the cavity.

  Further, two pairs of U-shaped grooves into which the cooling water pipe can be inserted are provided on the inner wall in the longitudinal direction of the cavity, and a small groove and a strip-like tongue are formed along each groove, and the inside of the two pairs of U-shaped grooves , The pair of U-shaped groove-side strips are caulked and deformed to fix the cooling water pipe to the inner wall of the cavity, and the other pair of U-shaped grooves are used as preliminary cooling water groove fixing grooves. It is what.

  Further, the cooling fins are formed by providing a plurality of longitudinal continuous grooves on both outer side surfaces of the arm.

  In claim 1, since the cooling water pipe is fixed to the inner wall in the longitudinal direction of the cavity, the cooling water pipe is hardly damaged, and the cooling water pipe placed in the U-shaped groove is fixed by caulking and deforming the belt-like tongue piece. Therefore, the arm structure of the welding gun having an excellent cooling function in which the cooling water pipe is closely and evenly adhered to the arm and heat exchange efficiency with the arm is enhanced.

  According to claim 2, in addition to the above effect, another pair of U-shaped grooves is used as a fixing groove for fixing the cooling water pipe, so that the arm structure of the welding gun with good cooling water pipe maintenance is provided. It is.

  According to the third aspect of the present invention, in addition to the above effects, the cooling fins are formed on both outer side surfaces of the arm, so that the arm structure of the welding gun further enhances the cooling of the arm.

  The arm of the welding gun is made of a light alloy whose inside is formed into a cavity in the longitudinal direction by extrusion molding, and a pair of U-shaped grooves for inserting cooling water pipes are provided on the inside wall in the longitudinal direction of the cavity and each groove A small groove and a strip-like tongue piece are formed along this, and the strip-like tongue piece is caulked and deformed to fix the cooling water pipe to the inner wall of the cavity.

  In addition, the arm of the welding gun is made of a light alloy whose inside is formed into a cavity in the longitudinal direction by extrusion molding, and two pairs of U-shaped grooves into which cooling water pipes can be inserted are provided in the longitudinal inner wall of the cavity. A small groove and a belt-like tongue are formed along each groove, and the cooling water pipe is formed on the inner wall of the cavity by caulking and deforming the belt-like tongue on the side of the pair of U-shaped grooves among the two pairs of U-shaped grooves. The other pair of U-shaped grooves is used as a fixing preliminary groove for the cooling water pipe.

  Furthermore, cooling fins are formed by providing a plurality of longitudinal grooves in both outer side surfaces of the arm.

A first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 1 denotes an X-type welding gun. The welding gun 1 is roughly composed of a fixed arm 3 fixed to the gun bracket 2 and a swinging arm 5 pivoted on the gun bracket 2; Electrode holders 6 and 7 provided on the distal ends of the arms 3 and 5; electrodes 10 and 11 attached from the electrode holders 6 and 7 through shanks 8 and 9; And a pressure driving member 12 connected to each of the rear end sides 3 and 5.

  Each of the arms 3 and 5 is made of a light alloy such as an aluminum material, and the inside is formed in the cavity 13 in the longitudinal direction by extrusion, and the inner wall 14 of the cavity 13 is formed. The cooling water pipes 15 and 16 are fixed to each other.

  FIG. 2 is a detailed view of the arm 3 or the arm 5 shown as a cross-sectional view along the line AA in FIG. 1 (the arm 3 will be described as an example). The process of fixing the cooling water pipes 15 and 16 is shown.

  As described above, the arm 3 is formed with a cavity 13 in the longitudinal direction by extrusion as described above, and a pair of U-shaped grooves 17 and 18 are provided on the inner wall 14 of the cavity 13. Small grooves 19 and 20 and belt-like tongue pieces 21 and 22 are formed along the lines 17 and 18 (see FIG. 2A). Then, cooling water pipes 15 and 16 are respectively inserted into the U-shaped grooves 17 and 18 (see FIG. 2B), and then the band-like tongue pieces 21 and 22 are deformed by caulking toward the cooling water pipes 15 and 16, respectively. The cooling water pipes 15 and 16 are tightly fixed to the inner wall 14 of the cavity 13.

  As shown in FIG. 3, one of the cooling water pipes 15 and 16, for example, the cooling water pipe 15 serves as a cooling water supply pipe, and the other cooling water pipe 16 serves as a cooling water discharge pipe. The supply water supplied to the nipple 23 arranged at the rear end of the arm 3 flows down in the cooling water pipe 15 to cool the arm 3 and is partially branched by the electrode holder 6. The remaining portion is returned to the cooling water pipe 16 from the electrode holder 6 through the shank 8 to cool the electrode 10 and then merges with the part branched by the electrode holder 6 as a return pipe. It is returned to the water pipe 16 and discharged from a nipple 24 arranged at the rear end of the arm 3.

  As described above, since the cooling water pipes 15 and 16 are both fixed to the inner wall 14 in the longitudinal direction of the cavity 13 of the arm 3, the cooling water pipes 15 and 16 are not easily damaged without being exposed to the outside. Since the cooling water pipes 15 and 16 placed in the grooves 17 and 18 are fixed by caulking and deforming the belt-like tongue pieces 21 and 22, the cooling water pipes 15 and 16 are evenly and sufficiently closely attached to the arm 3. As a result, the heat exchange efficiency with the arm 3 is improved and the cooling function is improved.

  4 and 5 show another embodiment of the present invention. In the second embodiment, the cooling water pipes 15 and 16 are applied exclusively for cooling the arm 3, and the cooling water pipes 25 and 26 for cooling the electrode 10 side also form separate flow paths in the arm 3. Yes. Since the remaining configuration is substantially the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIG. 5, the supply water supplied to the nipple 23 arranged at the rear end of the arm 3 flows down in the cooling water pipe 15 to cool the arm 3, and the arm 3 The cooling water pipe 16 is folded back at the front end side of the, and the arm 3 is cooled by the cooling water pipes 15 and 16.

  Then, the cooling water from the cooling water pipe 16 connected to the nipple 24 disposed at the rear end of the arm 3 is connected to the nipple 28 via the hose 27 and flows down to the cooling water pipe 25. The cooling water pipe 25 is provided for cooling the electrode 10 from the electrode holder 6 through the shank 8 through the inside of the cavity 13, and as a return pipe, the cooling water pipe 26 extends from the electrode holder 6 to the inside of the cavity 13 of the arm 3. And is discharged from the rear end of the arm 3.

  Also in this embodiment, since both the cooling water pipes 15 and 16 are fixed to the inner wall 14 in the longitudinal direction of the cavity 13 of the arm 3, the cooling water pipes 15 and 16 are hardly damaged without being exposed to the outside. Since the cooling water pipes 15 and 16 placed in the U-shaped grooves 17 and 18 are fixed by caulking and deforming the belt-like tongue pieces 21 and 22, the cooling water pipes 15 and 16 are evenly adhered to the arm 3. The cooling function is excellent because the heat exchange efficiency with the arm 3 is enhanced.

  FIG. 6 shows an embodiment in claim 2. In this third embodiment, two pairs of U-shaped grooves in the first embodiment are provided, and a small groove and a strip-like tongue are formed along each groove. Of the two pairs of U-shaped grooves, a pair of U-shaped grooves is formed. The belt-like tongue on the groove side is caulked and deformed to fix the cooling water pipe to the inner wall of the cavity, and the other pair of U-shaped grooves serve as preliminary fixing grooves for the cooling water pipe.

  In FIG. 6, 29 and 30 are other pairs of U-shaped grooves, and along these grooves 29 and 30, small grooves 31 and 32 and belt-like tongue pieces 33 and 34 are formed, and the remainder Since the configuration is substantially the same as that of the first embodiment, a part of the description is omitted.

A cavity 13 is formed in the arm 3 in the longitudinal direction by extrusion, and two pairs of U-shaped grooves 17 and 18 and U-shaped grooves 29 and 30 are formed on the inner wall 14 of the cavity 13. Small grooves 19 and 20 and strip-like tongues 21 and 22 are formed along the grooves 17 and 18, and small grooves 31 and 32 and belt-like tongues 33 and 34 are formed along the grooves 29 and 30 ( (See D in FIG. 6). Then, the cooling water pipes 15 and 16 are inserted into the U-shaped grooves 17 and 18 respectively, and then the belt-like tongue pieces 21 and 22 are deformed by caulking the cooling water pipes 15 and 16, respectively. The inner wall 14 of the 13 is closely fixed.
At this time, the other pair of U-shaped grooves 29 and 30 serve as preliminary grooves for fixing the cooling water pipes 15 and 16 (see e in FIG. 6).

  Therefore, when a failure occurs in the cooling water pipes 15 and 16 disposed in the U-shaped grooves 17 and 18, the cooling water pipes 15 and 16 are connected using the other pair of U-shaped grooves 29 and 30. Try to fix.

  As described above, when the holding of the cooling water pipes 15 and 16 is hindered, the cooling water pipes 15 and 16 can be managed without replacing the arm 3, so that the welding gun having good maintenance of the cooling water pipes can be used. -It also has a mud structure.

  2, 4 or 6 shows an embodiment in claim 3. The fourth embodiment is substantially the same as the arm structure in the previous embodiments except that cooling fins 35 and 35 are formed by providing a plurality of longitudinal continuous grooves on both outer surfaces of the arms 3 and 5. The description thereof will be omitted.

  In this way, when the cooling fins 35, 35 are formed by providing a plurality of longitudinal grooves on both outer surfaces of the arms 3, 5, the arms 3, 5 are connected to the cooling water pipes 15, 16, respectively. The cooling of the arms 3 and 5 is further enhanced from the time when the arms 3 and 5 can be cooled by natural ventilation on both outer surfaces of the arms 3 and 5 after cooling from the inside. Arm structure of welding gun.

  In the above embodiment, the X-type welder has been described as the welding apparatus using the arm according to the present invention. However, the arm can be applied to, for example, a C-type welder other than the X-type welder. It can be done.

It is a schematic side view of the welding apparatus according to the present invention. It is the longitudinal cross-sectional view of the arm. It is a schematic explanatory drawing of the piping of the cooling water pipe in the arm. It is a longitudinal cross-sectional view of the arm of another Example. It is a schematic explanatory drawing of the piping of the cooling water pipe in the arm. It is the longitudinal cross-sectional view of the arm of other Example.

Explanation of symbols

3,5 Arm 13 Cavity 14 Inner wall 15,16 Cooling water pipe 17,18 U-shaped groove 19,20 Small groove 21,22 Strip tongue 29,30 Other pair of U-shaped grooves 31,32 Other Pair of small grooves 33, 34 Another pair of strips 35 Cooling fins

Claims (3)

In a light alloy welding gun arm whose inside is formed into a cavity in the longitudinal direction by extrusion molding, a pair of U-shaped grooves for inserting a cooling water pipe are provided on the inside wall in the longitudinal direction of the cavity, and A welding gun arm structure characterized in that a small groove and a belt-like tongue are formed along the belt, and the cooling water pipe is fixed to the inner wall of the cavity by caulking and deforming the belt-like tongue. In a welding alloy arm made of a light alloy whose inside is formed into a cavity in the longitudinal direction by extrusion molding, two U-shaped grooves into which cooling water pipes can be inserted are provided on the inside wall in the longitudinal direction of the cavity, and A small groove and a belt-like tongue are formed along the groove, and the cooling water pipe is fixed to the inner wall of the cavity by caulking and deforming the belt-like tongue on the side of the pair of U-shaped grooves among the two pairs of U-shaped grooves. An arm structure of a welding gun, wherein the other pair of U-shaped grooves is used as a preliminary groove for fixing a cooling water pipe. 3. The arm structure for a welding gun according to claim 1, wherein a cooling fin is formed by providing a plurality of longitudinal grooves in both outer side surfaces of the arm.