JP5582437B2 - Stud welding jig - Google Patents

Description

  The present invention relates to a jig for preventing sparks and molten metal generated during stud welding and at the same time reducing blast and explosion noise.

  Conventionally, a method of performing stud welding using a capacitor discharge welding apparatus composed of a combination of a welding apparatus main body and a welding gun has been widely used in various fields in terms of ease of handling and good workability. . In this type of welding method, an arc is generated by flowing a welding current between a stud attached to a welding gun and a base material, and the stud and the base material are welded. Therefore, it is inevitable that when an arc occurs, sparks and molten metal are scattered, and there is a large blast and sound. These phenomena cause serious problems at work sites such as indoors. In particular, there is a risk of fire when there is a flammable material around the work site, and there is a risk that the worker may be burned by being exposed to sparks when working toward the ceiling.

  In order to solve such a problem, an electrically insulating hollow cylindrical main body that has one end attached to a welding gun and the other end extends to substantially the same plane as the tip of a stud to be welded attached to the welding gun. A stud welding jig is proposed in which a muffler muffler communicating with the inside of a hollow cylindrical main body and a window portion made of a heat-resistant transparent member are provided on the outer peripheral surface of the stud. (See Patent Document 1)

According to this stud welding jig, what is conventionally performed by the open type is a closed type, and a muffler is attached to the closed type to prevent sparks and molten metal from being scattered when an arc occurs. In particular, it was possible to reduce noise generation.
JP-A-5-237660

  Conventionally known stud welding jigs such as those mentioned above may have some effect in terms of preventing sparks and molten metal that are generated when arcs are generated and suppressing noise, but may not be recognized in some cases. Can happen.

  That is, in the stud welding, as described above, a high-voltage welding current is forcibly passed instantaneously between the stud attached to the welding gun and the base material. Then, an arc is generated at the tip of the stud, and the stud and the base material are welded by metal melting occurring at the stud tip. Naturally, the total length of the stud is melted and shortened by the amount of metal melted at the stud tip. The degree of melting differs depending on various conditions such as the thickness of the stud and the shape of the tip.

  By the way, when a hollow cylindrical main body extending to the same plane as the tip of the stud as shown in the patent document is attached to the welding gun, for example, when the length of the hollow cylindrical main body is too long and disturbs, Prone to contact with the base material. Even if an arc is generated at the tip of the stud under such conditions and welding can be performed without scattering sparks due to the action of the hollow cylindrical body, the amount of metal melting is insufficient and pseudo welding is likely to occur. difficult. On the other hand, when the arc is generated with the stud tip protruding from the hollow cylindrical body and there is even a slight gap between the base material and the hollow cylindrical body, even if the stud can be welded to the base material, sparks or melting Neither metal scattering nor blast and sound can be prevented, and the intended effect of the jig cannot be obtained.

  Accordingly, an object of the present invention is to provide a stud welding jig capable of completely solving the problems of sparks, molten metal scattering, blast and explosion caused by stud welding as described above and capable of reliably welding the stud to the base material. There is.

  In order to achieve the above object, a stud welding jig according to the present invention is in a stud welding jig A composed of a hollow cylindrical main body having two upper and lower parts of a and b, and an upper hollow cylindrical shape. The body is made of a heat-resistant and fire-resistant hard material that is formed into a hollow cylindrical body, one end of which can be attached to a welding gun, and a plurality of vent holes are formed in the peripheral wall of the hollow cylindrical body And a breathable filter is affixed to close the vent hole, and the lower hollow cylindrical body is hollow with an elastic material having electrical insulation, heat resistance and fire resistance. It is formed in a cylindrical body so that the other end can be in close contact with the base metal, and the base metal close peripheral edge is held by a hollow cylindrical body that is longer than the surface of the tip of the stud attached to the welding gun. And follow the pressure of the welding gun during welding Hollow cylinder of elastic Te is in the stud welding gun jig, characterized in that the bending and stretching deformation.

  In addition, in the hollow cylindrical main body of the lower layer, there is a stud welding gun jig in which side edge ribs having a wider diameter are formed in the vicinity of the base material close peripheral part than the base part close peripheral part. is there.

  Furthermore, in the hollow cylindrical body peripheral wall portion of the lower hollow cylindrical main body, a stud welding is formed in which a narrowing taper is formed from the position of the side edge rib toward the joining axis direction with the upper hollow cylindrical main body. Located in gun jig.

  In the upper hollow cylindrical main body, it is sufficient to appropriately select a material suitable for the purpose such as a hard material having heat resistance and fire resistance to form a hard hollow cylindrical body. For example, preferable materials include flame retardant resin and aluminum.

  The upper hollow cylindrical body is closed with an upper lid having a hole in the center so that a welding gun can be attached to one end thereof. The upper lid is preferably formed of the same material as that of the upper hollow cylindrical main body. For the joining of the upper lid and the hollow cylindrical main body, screwing or fitting fixing can be selected as appropriate.

Furthermore, in the upper hollow cylindrical main body, a plurality of gas vent holes are provided in the peripheral wall portion of the hollow cylindrical body. It is sufficient for the vent hole to have an area that allows the blast generated by stud welding to be pulled out without much resistance.
The gas vent hole is provided with a breathable filter so as to completely cover and close the gas vent hole of the hollow cylindrical body. This filter needs to have air permeability, and is preferably a film or non-woven fabric having heat resistance, fire resistance and shock absorption. For example, as a preferable material, a protective sheet for a welded spark receiver can be used.

  Next, in the lower hollow cylindrical main body, it is sufficient to appropriately select a material suitable for the purpose from an elastic material having electrical insulation properties, heat resistance and fire resistance, and to form an elastic hollow cylindrical body. . For example, it is molded with a material appropriately selected from materials suitable for the purpose such as a rubber material excellent in moldability and bendability.

  The elastic hollow cylinder is held in the air cylinder longer than the surface of the tip of the stud attached to the welding gun, and the elastic hollow cylinder follows the pressing operation of the welding gun during welding. The body is bent and stretched, and the base material is always kept in close contact with the base material during arc generation. At this time, the pressing force of the welding gun toward the base material is transmitted to the lower elastic hollow cylindrical main body through the upper hard hollow cylindrical main body, and the elastic hollow cylinder follows the pressing pressure of the welding gun. The body part is bent and stretched, and the state where the base material is in close contact with the base material is always maintained. Usually, the object as a jig is achieved in the state of the hollow cylindrical main body composed of the upper and lower layers.

  Furthermore, in the elastic hollow cylindrical body, side edge ribs having a wider diameter than the peripheral edge diameter of the base metal close peripheral edge are formed in the vicinity of the base metal close peripheral edge, thereby The pressing force is bent and stretched in the inner winding direction at the base material intimately peripheral portion by the action of the side edge ribs. When further pressing pressure is applied, the side edge ribs themselves are also bent and stretched and brought into close contact with the base material, and in the case of an elastic hollow cylindrical body, the close contact force with the base material is strengthened.

  Further, in the peripheral wall portion of the elastic hollow cylindrical body, a narrowing taper is formed from the position of the side edge rib toward the joining axial direction with the upper hollow cylindrical main body, thereby pushing the welding gun. The peripheral wall of the hollow cylindrical body is expanded in a convex shape by bending and stretching, and the instantaneous blast generated by the arc is softened by bending and stretching. It is effective that the narrowing taper angle is maintained at an inner angle of about 70 to 85 degrees with respect to the rib plane.

  In the stud welding jig A according to the present invention, a degassing hole provided in the peripheral wall portion of the hard hollow cylindrical body and a filter for closing the hole are attached, and the inside of the hollow cylindrical main body generated during arcing The blast and sound can be effectively discharged out of the housing and substantially reduced.

Particularly, the lower hollow cylindrical main body made of an elastic hollow cylindrical body is configured to be kept longer than the surface of the front end of the stud attached to the welding gun, so that the front end of the stud is a hollow cylindrical body. Without being protruded, the periphery of the stud and the base material to be welded is always completely surrounded, so that the stud can be welded with peace of mind. Then, following the pressing force of the welding gun during welding, the base metal tight peripheral edge is bent and stretched, the side edge rib is bent and stretched, and the tapered hollow cylindrical peripheral wall is also bent and stretched. These interlocking bending and stretching deformations enhance the close contact between the base metal and the base metal, and it consists of two layers, upper and lower, without the occurrence of sparks, molten metal, etc. generated during arcing, blasts and explosions. Various problems such as sparks, molten metal scattering, blast and explosion caused by arc generation are substantially reduced by being retained in the hollow cylindrical body housing and discharged from the vent hole. This is extremely useful and practical for performing a safe welding operation.
Incidentally, it is said that the instantaneous blast at the time of arc generation in stud welding runs at a speed of 20 m / sec with an air amount of 500 cc. The present invention can completely prevent sparks and molten metal from being scattered with this intense blast.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a stud welding jig A of the present invention. FIG. 2 shows a state in which a stud and a welding gun are mounted on the stud welding jig A. As shown in FIGS. 1 and 2, the stud welding jig A is composed of a hollow cylindrical main body composed of upper and lower layers of an upper hollow cylindrical main body and a lower hollow cylindrical main body. Reference numeral 1 denotes a hard aluminum hollow cylindrical body formed of aluminum having heat resistance and fire resistance. One end is closed by an upper lid 5 having a hole 4 in the center so that the welding gun 10 can be mounted. A plurality of gas vent holes 2 are provided in the cylindrical peripheral wall portion of the hard aluminum hollow cylindrical body 1. Then, a heat-resistant, fire-resistant and shock-absorbing fireproof cloth having air permeability is attached as the filter 3 so as to cover and close all the vent holes 2 in the peripheral wall portion. The other end of the portion is mated with one end of the lower portion.

  Different from the hard aluminum hollow cylinder 1 described above, 6 is an elastic silicon rubber hollow cylinder formed of silicon rubber having electrical insulation, heat resistance and fire resistance. The other end 7 of the elastic silicon rubber hollow cylinder 6 can be brought into close contact with the base material B. The elastic silicon rubber hollow cylindrical body 6 is kept longer than the surface of the stud tip 12 of the stud 11 attached to the welding gun 10. As a result, the stud 11 including the stud tip 12 and the welding gun 10 are surrounded by a housing constituted by the hard aluminum hollow cylinder 1 and the elastic silicon rubber hollow cylinder 6.

  FIG. 3 conceptually illustrates a state when the stud 11 is welded to the base material B. At the time of welding, the base material close peripheral edge portion 7 of the elastic hollow cylindrical body 6 is brought into close contact with the base material B by bringing the stud 11 into contact with the base material B with the welding gun 10. Then, following the pressing operation of the welding gun 10, the base material close peripheral edge portion 7 is bent and stretched so as to be wound inwardly. By further pressing operation of the welding gun, the side edge ribs 8 are bent and stretched toward the base material B and brought into close contact with the base material B, and the tightness between the elastic hollow cylindrical body 6 and the base material B is further strengthened. Is done. This series of bending and stretching deformations is due to the action of providing side edge ribs 8 having a wider diameter portion in the vicinity of the base material close peripheral edge portion 7 than the base material close peripheral edge portion 7 in close contact with the base material B. It is.

Further, in the hollow cylindrical body peripheral wall portion 9, a narrowing taper is formed from the position of the side edge rib 8 toward the joining axis direction with the hard hollow cylindrical body 1, so that the pressing pressure of the welding gun is reduced. The hollow cylindrical body peripheral wall portion 9 is expanded in a convex shape by bending and stretching deformation, and the instantaneous blast generated by the arc is received and softened by bending and stretching deformation. The taper angle of narrowing at this time is an inner angle of 77.5 degrees with respect to the plane of the rib.
As a result, the sparks and molten metal scattered at the stud tip 12 and the strong blast and sound do not leak from the base material B, and the elastic silicon rubber hollow cylinder 6 and It passes through the housing of the hard aluminum hollow cylindrical body and is discharged from the gas vent hole 2 to prevent the sparks and molten metal from being aimed at by the jig of the present invention and to reduce the blast and sound.

Side surface sectional drawing which shows one Example of the jig for stud welding by this invention. Side surface sectional drawing which shows the state which mounted | wore the jig | tool for stud welding of this invention with the welding gun. Explanatory sectional drawing which shows notionally the state at the time of a stud being welded to a base material.

A .... Stud welding jig a ... Upper hollow cylinder b ... Lower hollow cylinder 1. Hard hollow cylinder 2. Gas vent hole 3. ··· Filter 4 ························································ 5 Cylindrical peripheral wall 10 ··· Welding gun 11 ··· Stud 12 ··· Stud tip B ··· Base material

Claims (1)

It consists of a hollow cylindrical body consisting of upper and lower two layers
The upper hollow cylindrical body is made of a hard material having heat resistance and fire resistance and is formed into a hollow cylindrical body, one end of which can be attached to a welding gun, and a plurality of peripheral wall portions of the hollow cylindrical body are provided on the peripheral wall portion. It is a part that is equipped with a gas vent hole and a breathable filter is stuck so as to close the gas vent hole. In the lower hollow cylindrical body, electrical insulation and heat resistance It is made of a fire-resistant elastic material in a hollow cylindrical body, and its other end can be in close contact with the base material, and its base material close peripheral edge is longer than the surface of the tip of the stud attached to the welding gun. A stud welding gun jig comprising: a hollow portion formed by bending and stretching an elastic hollow cylindrical body following the pressing force of a welding gun during welding ,
The lower hollow cylindrical main body is characterized in that the side edge rib having a wider diameter than the peripheral edge diameter of the base material intimate peripheral part is a round part formed in the vicinity of the base material intimate peripheral part. Stud welding gun jig.

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