JP3213091U - Nut and bolt welding electrode holder - Google Patents

Abstract

An electrode holder for welding a nut with a projection and a bolt with a projection, and an electrode holder that can be conveniently used even when there are restrictions on the shape of a workpiece, restrictions on a welding location, and the like. A nut welding electrode holder 1 for holding a lower electrode 2 for nut welding includes a shaft member 8 held by a clamp tool 20 on a welding machine body side and an arm member 9 coupled to the shaft member. In a state where the shaft member and the arm member are coupled, the L-shaped shape is formed, and a positioning pin 6 biased upward by the compression spring 5 is accommodated on the distal end side of the arm member. An air passage for supplying pressurized air to the side of the housing recess, and when one of the air passages is selected, the other air passage can be sealed. To. [Selection] Figure 1

Description

  The present invention relates to an electrode holder for welding a nut with a projection and a bolt with a projection, and is an electrode holder that can be used conveniently without being restricted even when there are restrictions on the shape of the workpiece or restrictions on the welding location. Regarding improvement.

Conventionally, in spot welding in which workpieces such as two stacked steel plates are welded, welding is generally performed by sandwiching the workpiece between a pair of electrodes and applying a pressure current. When there is an obstacle on the wire, a technique is known in which an electrode is attached to an L-shaped electrode holder called a so-called L-shaped holder and spot welding is performed while avoiding the obstacle. As an electrode holder, the present applicant eliminates the waste of cutting and processing from a single material, and in order to facilitate production, a technique for manufacturing two materials in combination (for example, Patent Document 1). See).
This technology uses, as two materials, an arm member in which a cooling passage is formed inside and a shaft member that can be attached to a clamp on the main body side of the welder. The electrode is attached to the tip side of the.

Japanese Patent No. 3856383.

  On the other hand, as a technique for welding projection nuts and projection bolts to steel plates, etc., a perforated steel plate and projection nuts and projection bolts are overlapped, both for nuts with positioning pins and for bolts with positioning pipe A technique is also known in which nuts are welded in the same manner as spot welding, and when such a nut with projection is bolt-welded with projection, for example, an obstacle is placed on the extension line of the electrode. In such a case, it would be convenient if an electrode holder such as an L-shaped holder could be used.

  Therefore, the present invention relates to an electrode holder for welding a nut with projection or a bolt with projection, and provides an electrode holder that can be used without being restricted even when there are restrictions on the shape of the workpiece and restrictions on the welding location. The purpose is to do.

  In order to achieve the above object, the present invention provides a nut welding electrode holder for holding an electrode for nut welding, comprising: a shaft member held by a clamp on the welding machine body side; and an arm member coupled to the shaft member. In the state where the shaft member and the arm member are coupled, an L-shaped shape is formed, and a positioning pin urged upward by a compression spring is provided on the distal end side of the arm member, An accommodating recess for accommodating the compression spring is formed, and an air passage for sending pressurized air is provided in communication with the accommodating recess on the side of the accommodating recess, and the positioning pin is provided on the arm member. A through-hole of the electrode held on the distal end side is inserted, and a cooling connection mechanism for cooling the heat generated around the electrode can be connected to the proximal end side of the arm member.

Then, when the nut is placed on the perforated steel plate, the positioning pin that passes through the through hole of the electrode is inserted through the hole of the steel plate, and the upper end of the positioning pin projects toward the hole of the nut, thereby By positioning and energizing the electrode with pressure, the projection part of the nut is melted and welded. Further, in order to remove foreign matters such as spatter and impurities generated during welding, pressurized air is sent to the housing recess through the air passage, and the foreign matter is removed from the housing recess to the outside.
Further, the periphery of the electrode is cooled by a cooling connection mechanism connected to the base end side of the arm member. As such a cooling structure, a structure as shown in Japanese Patent No. 3856383 can be applied.

Further, in the present invention, as the air passages on the side of the housing recess, a pair is provided at opposed positions across the housing recess, and when one of the air passages is selected, the other air passage can be sealed. I made it.
As described above, if a pair of air passages are provided at the opposing positions and any one of the air passages can be arbitrarily selected, it is difficult to receive restrictions on the place of use, and the degree of freedom of use is further increased.

  Further, in the present invention, in the bolt welding electrode holder for holding the electrode for bolt welding, the shaft member is held by the clamp on the welding machine main body side, and the arm member is coupled to the shaft member, In a state where the shaft member and the arm member are coupled, an L-shaped shape is formed, and an accommodation recess for accommodating a part of the lower end side of the electrode is formed on the distal end side of the arm member. In addition, an air passage for sending pressurized air is provided on the side of the housing recess to communicate with the housing recess, and heat generated around the electrode is cooled on the base end side of the arm member. The connection mechanism for cooling was made connectable. Also in this case, as the air passages on the side of the housing recess, a pair is provided at opposite positions across the housing recess, and when one of the air passages is selected, the other air passage can be blocked. Like that.

  With such a configuration, even when there are restrictions on the shape of the workpiece and restrictions on the welding location, it is possible to make it difficult to be restricted.

A nut welding electrode holder for holding an electrode for nut welding, comprising: a shaft member held by a clamp on the welding machine main body side; and an arm member coupled to the shaft member. In the coupled state, an L-shaped shape is formed, and a positioning pin that is biased upward by the compression spring and an accommodation recess for accommodating the compression spring are formed on the distal end side of the arm member. As a result, there is no restriction on the place of use of the electrode holder dedicated to nut welding, and the degree of freedom of use can be increased.
Further, in the bolt welding electrode holder for holding the bolt welding electrode, in a state where the shaft member and the arm member are coupled, the L-shaped shape is formed, and the electrode member is disposed on the distal end side of the arm member. By forming an accommodation recess for accommodating a part of the lower end side, it is possible to eliminate restrictions on the place of use of the electrode holder dedicated for bolt welding and increase the degree of freedom of use.
At this time, it is preferable that the air passage formed on the side of the housing recess is provided in a pair at opposing positions with the housing recess interposed therebetween, so that the degree of freedom in use can be further increased.

It is explanatory drawing of the welding state which shows a part of electrode holder for nut welding in a cross section. It is explanatory drawing of the main-body part of the electrode holder of FIG. 1, (a) is a top view, (b) is a side view. It is explanatory drawing which shows the accommodation state of the compression spring and positioning pin which are assembled | attached in the accommodation recessed part of the main-body part of the electrode holder of FIG. It is explanatory drawing of the welding state which shows a part of electrode holder for bolt welding in a cross section.

  The electrode holder for the nut and bolt welding according to the present invention eliminates the restrictions on the use place of the electrode holder dedicated to nut welding, and can increase the degree of freedom of use. It has been proposed as an improved technique.

First, the case of nut welding will be described.
An outline of nut welding will be described with reference to FIG. 1. On a lower electrode 2 held by an electrode holder 1 dedicated to nut welding, a perforated steel plate W and the like and a nut N having a projection portion p are placed. . At this time, the positioning pin 17 inserted through the through hole of the lower electrode 2 is set so as to pass the hole of the steel plate W and the hole of the nut N, and the nut N is in a state where the projection part p is in contact with the steel plate W. Placed.

  Next, the upper electrode 21 that has been waiting in the upper direction descends, comes into contact with the upper surface of the nut N, and the upper electrode 21 and the lower electrode 2 sandwich the workpiece and pressurize it. At this time, a recess for avoiding interference with the top of the positioning pin 17 is formed on the lower surface of the upper electrode 21.

And in this state, by supplying with electricity between the upper electrode 21 and the lower electrode 2, the projection part p of the nut N will fuse | melt and the nut N and the steel plate W will be welded.
The nut welding electrode holder 1 is configured as a holder for holding the lower electrode 2 as described above.

  As shown in FIGS. 1 and 2, the electrode holder 1 includes a main body 3 combined in an L shape, and a compression spring 5 and a positioning pin incorporated in a housing recess 4 formed on the distal end side of the main body 3. 6, a lower electrode 2 mounted on the upper portion of the housing recess 4, and a cooling connection mechanism 7 connected to the proximal end side of the main body 3. The main body 3 is a clamp on the welding machine side. The shaft member 8 is clamped and held by 20 (FIG. 1), and the arm member 9 is assembled in a substantially perpendicular direction to the shaft member 8.

  That is, the housing recess 4 is formed on the upper surface on the distal end side of the arm member 9, and the taper-like fitting capable of fitting the upper end tapered portion of the shaft member 8 on the lower surface on the proximal end side of the arm member 9. A mating recess 10 is formed, and the upper end of the shaft member 8 is fitted in close contact with the fitting recess 10, and then a countersunk screw 11 is passed through a screw hole formed above the fitting recess 10. The arm member 9 and the shaft member 8 are coupled by screwing to the surface.

  Further, a screw hole n for connecting a cooling connection mechanism 7 described later is formed on the base end side of the arm member 9, and a cooling water passage 12 is dug forward from the screw hole n. The cooling water channel 12 also penetrates the shaft member 8, and its tip extends to the vicinity of the housing recess 4.

The cooling connection mechanism 7 connected to the base end side of the arm member 9 includes a screw pipe portion 7n that can be screwed into the screw hole n of the base end of the arm member 9. The connection mechanism 7 is provided with a cooling water supply port 13x for feeding cooling water and a cooling water drain port 13y for discharging cooled cooling water.
Further, a tube 14 having a diameter smaller than the diameter of the cooling water passage 12 and a length that reaches almost to the back of the cooling water passage 12 is connected to the distal end side of the screw pipe portion 7n.
Then, the cooling water fed from the cooling water supply port 13x passes through the tube 14 and enters the cooling water channel 12 to cool the surroundings, and the cooled cooling water is a gap between the tube 14 and the inner wall of the cooling water channel 12. It is made to flow backward through the cooling water discharge port 13y.

The assembly parts around the accommodation recess 4 on the distal end side of the arm member 9 will be described with reference to FIG.
The housing recess 4 includes an upper large-diameter screw hole and a lower small-diameter spring housing hole. The compression spring 5 is housed in the lower spring housing hole, and a heat insulating effect is provided above the compression spring 5. The positioning pin 6 is placed through a high baking tray 16. Further, when the small diameter screw portion at the lower end portion of the perforated lower electrode 2 is screwed in a state where the compression spring 5, the bake tray 16 and the positioning pin 6 are accommodated in the accommodation recess 4, the compression spring 5 is pressed. Thus, the compression force is exerted, and the positioning pin 6 is urged upward and can be raised and lowered by a predetermined stroke.

  Further, as shown in FIG. 2A, a pair of left and right air passages 18 a and 18 b are formed on the side of the housing recess 4 so as to sandwich the housing recess 4. Has been.

  When the product is shipped, a speed controller terminal (not shown) for supplying pressurized air to one of the pair of left and right air passages 18a and 18b is connected, and the other passage is connected to the other passage. It has a blind lid. The user can use the electrode holder 1 in a state optimal for the place by reattaching the speed controller terminal and the blind cover in an appropriate direction according to the place of use.

In the welding electrode holder 1 as described above, as shown in FIG. 1, the workpiece is sandwiched and pressurized by the upper electrode 21 and the lower electrode 2, and at the same time, from either one of the air passages 18 a and 18 b into the housing recess 4. Energize while feeding pressurized air. Then, the projection part p of the nut N is melted and the nut N and the steel plate W are welded, and foreign matters such as spatter are discharged to the periphery by pressurized air.
At this time, since the possibility of receiving restrictions on the welding location and the shape of the workpiece is suppressed, welding can be effectively performed. Further, since the electrode holder 1 is divided into the shaft member 8 and the arm member 9, the production cost is low and the production is not time-consuming.

Next, the bolt welding electrode holder 25 will be described with reference to FIG.
The electrode holder 25 for bolt welding includes an accommodation recess 4 formed on the distal end side of the arm member 9 and a lower electrode 26 attached to the upper portion of the accommodation recess 4. An insertion hole 26 h for inserting the shaft portion of the bolt B is formed, and a positioning pipe 31 made of an insulating member is fixed to the insertion hole 26 h and communicates with the housing recess 4.
Other mechanisms such as a cooling structure are the same as those of the electrode holder 1 for nut welding.

In the bolt welding electrode holder 25 as described above, when the bolt B having the projection portion p is placed on the perforated steel sheet W or the like, the upper electrode 21 that has been waiting above is lowered, and the bolt B The workpiece is sandwiched between the upper electrode 21 and the lower electrode 26, pressurized, and energized. Then, the projection part p of the bolt B is melted, and the bolt B and the steel plate W are welded.
Also in this case, since the possibility of receiving restrictions on the welding location and the shape of the workpiece is suppressed, welding can be performed effectively.

  In addition, this invention is not limited to the above embodiments. Those having substantially the same configuration as those described in the claims of the utility model registration of the present invention and having the same operational effects belong to the technical scope of the present invention. For example, the bolt that can be applied in the electrode holder 25 for bolt welding is not limited to a bolt formed with a screw on the shaft portion of the bolt B, but a bolt-type pin in which a screw is not formed on the shaft portion. It is also applicable to.

  When welding nuts and bolts with projection parts, the possibility of receiving restrictions on the shape of the workpiece and the place of use is reduced, so that it is expected to be used in a wide range of fields mainly in parts assembly factories.

  DESCRIPTION OF SYMBOLS 1 ... Electrode holder for nut welding, 2 ... Lower electrode for nut welding, 3 ... Main-body part, 4 ... Housing recessed part, 5 ... Compression spring, 6 ... Positioning pin, 7 ... Cooling connection mechanism, 8 ... Shaft member, DESCRIPTION OF SYMBOLS 9 ... Arm member, 18a, 18b ... Air passage, 20 ... Clamp tool, 25 ... Electrode holder for bolt welding, 26 ... Lower electrode for bolt welding

Claims (4)

An electrode holder for nut welding for holding an electrode for nut welding, comprising: a shaft member held by a clamp on the welding machine main body side; and an arm member coupled to the shaft member, the shaft member and the arm member And a positioning pin that is urged upward by a compression spring on the front end side of the arm member, and an accommodation for accommodating the compression spring. A concave portion is formed, and an air passage for feeding pressurized air is provided in communication with the accommodating concave portion on the side of the accommodating concave portion, and the positioning pin is an electrode held on the distal end side of the arm member And a cooling connection mechanism for cooling the heat generated around the electrode is connectable to the base end side of the arm member. Electric Holder. A pair of air passages on the side of the housing recesses are provided at opposite positions across the housing recess, and when one of the air passages is selected, the other side air passage is sealed. The electrode holder for nut welding according to claim 1, characterized in that: An electrode holder for bolt welding for holding an electrode for bolt welding, comprising: a shaft member held by a clamp on the welding machine main body side; and an arm member coupled to the shaft member, the shaft member and the arm member In the state where the two are coupled together, an L-shaped shape is formed, and an accommodation recess for accommodating a part of the lower end side of the electrode is formed on the distal end side of the arm member. On the side of the housing recess, an air passage for sending pressurized air is provided in communication with the housing recess, and on the base end side of the arm member, cooling for cooling the heat generated around the electrode is provided. An electrode holder for bolt welding, wherein the connection mechanism for connection is made connectable. A pair of air passages on the side of the housing recesses are provided at opposite positions across the housing recess, and when one of the air passages is selected, the other side air passage is sealed. The electrode holder for bolt welding according to claim 3, wherein:

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