JPH0811305B2 - Electrode connection structure for resistance welding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection structure of electrodes for a resistance welding machine used in spot welding, projection welding and the like.

[Background technology]

As shown in FIG. 3, the conventional electrode welding structure for the resistance welding machine has an electrode holder 23 having an electrode holding hole 22 communicating with the drainage channel 21, and an electrode holding hole 22 held in the electrode holder 23. An electrode 25 having a water passage hole 24 that is connected to the hole 22, and a water passage pipe 27 that is connected to the water absorption passage 26 provided in the electrode holder 23 and extends from the electrode holding hole 22 into the water passage hole 24. Is.

Inclined wall surfaces 28 are formed on the outer peripheral portion of the electrode 25 and the inner peripheral portion of the electrode holding hole 22, and the electrode 25 is wedge-shaped fitted and held in the electrode holding hole 22.

Cooling water is supplied from the water passage pipe 27 into the water passage hole 24 in the electrode 25 to cool the electrode 25. The cooling water is sealed by the inclined wall surface 28.

It should be noted that the electrode 25 has a width across flat portion 30 that fits with the wrench 29.
(See FIG. 4) are provided.

However, in such a configuration, since the cooling water is sealed by the inclined wall surface 28, water leakage easily occurs.

Since the electrode 25 is strongly pushed into the electrode holding hole 22 to prevent water leakage, the electrode should be
A strong force was required to remove 25 while rotating it (see Fig. 4). Furthermore, the work of stopping the flow of the cooling water is required, and the replacement work is troublesome.

Further, even if the water flow is stopped during the replacement work, the residual water is scattered around, causing electric leakage and the like, which is a safety problem.

[Object of the Invention]

An object of the present invention is to provide a connection structure for electrodes for a resistance welding machine, which is safe because liquid leakage does not occur and leakage of electricity can be prevented, is easy to replace, and has a high cooling effect.

[Disclosure of Invention]

The connection structure of the electrode for the resistance welding machine of the present invention has a current-carrying portion extending from the base end to the tip side and having a built-in heat pipe,
An electrode having a ring portion provided around the current-carrying portion and having a groove formed in the circumferential direction of the outer circumference, and an electrode having an electrode body provided at the tip of the current-carrying portion, and a current-carrying member that contacts the base end of the current-carrying portion. An electrode holder having a contact portion, a cylindrical portion having a hard-ball projecting hole that fits over the ring portion and is aligned with the groove portion, and having a cooling liquid passage therein that passes near the current-carrying contact portion; A hard sphere fitted into the hard sphere projecting hole and capable of being engaged with and disengaged from the groove, and a slide having an inner wall formed with an inclined wall surface that slidably fits on the cylindrical portion and that pushes the hard sphere into the groove. An outer cylinder portion and a spring that biases the slide outer cylinder portion against the electrode holder so that the inclined wall surface pushes the hard sphere.

According to the configuration of the present invention, the cooling liquid passage is provided only in the electrode holder, and since the cooling liquid does not flow into the electrode, liquid leakage does not occur. Since the cooling liquid does not scatter to the surroundings even when the electrodes are replaced, it is possible to prevent the occurrence of electric leakage and is safe. In addition, since the process of preventing liquid leakage (stopping the flow of the cooling liquid, etc.) is not required during the replacement work, the work is simple.

Since an electrode that extends from the base end to the tip side and has a built-in heat pipe is provided, and a cooling liquid path that passes near the current-carrying contact portion that contacts the base end of this electrode is provided in the electrode holder, the heat generated at the tip of the electrode is provided. Is efficiently transmitted to the electrode holder side through the heat pipe and then to the cooling liquid passage. Therefore, the electrode cooling effect is high and the electrode life is long.

Furthermore, by sliding the sliding outer cylinder against the spring, the hard sphere is not pushed by the slanted wall surface, so the hard sphere can move radially outward and away from the groove. It can be removed from the department. Therefore, since the electrode can be easily attached to and detached from the electrode holder, the electrode can be easily replaced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a sectional side view of an embodiment of the present invention, and FIG. 2 is an exploded view thereof. The connection structure of the electrode for the resistance welding machine has a current-carrying portion 9 extending from the base end 2 to the tip 3 side and incorporating the heat pipe 4, and is provided around the current-carrying portion 9 and has a groove portion in the circumferential direction of the outer circumference. An electrode 1 having a ring portion 10 having an electrode 11 and an electrode body 8 provided at the tip of the current-carrying portion 9 and a current-carrying contact portion 6 in contact with the base end 2 of the current-carrying portion 9 are provided in the ring portion 10. Hard-ball projecting hole 17 for aligning the externally fitted groove portion 11
An electrode holder 5 having a cylindrical portion 16 in which a cooling liquid passage 7 passing near the energization contact portion 6 is formed, and a hard ball projecting hole 17
And a slidable wall 15 that is slidably fitted on the cylindrical portion 16 and that pushes the rigid sphere 15 into the groove portion 11 so as to be locked in the groove portion 11. Tube part 13
And a spring 14 for urging the slidable outer cylinder portion 13 against the electrode holder 5 so that the inclined wall surface 18 pushes the hard sphere 15.

In FIG. 1, the electrode 1 comprises an electrode body 8, a current-carrying portion 9 and a ring portion 10. The electrode body 8 is made of a rod-shaped copper alloy or the like, and is provided on the tip 3 side of the electrode 1. The current-carrying part 9 is rod-shaped and is provided on the base end 2 side of the electrode 1 and holds the electrode body 8. The ring portion 10 is fitted onto the energizing portion 9 and has a groove portion 11 in the circumferential direction of the outer circumference. The base end 2 of the electrode 1 has a substantially conical shape.

The heat pipe 4 is arranged on the axis of the current-carrying portion 9 of the electrode 1, one end reaches the base end 2 portion, and the other end extends toward the tip 3 side to reach the vicinity of the electrode body 8. The heat pipe 4 has a structure in which a spiral tube is housed in a closed container on a rod and the working liquid is sealed under reduced pressure, and has a high heat transfer rate between both ends.

The electrode holder 5 is composed of a holder body 12 and a slide outer cylinder portion 13, and has a spring 14 and a hard sphere 15 as a means for holding the electrode 1. The holder body 12 is composed of a base portion 20 and an electrode holding cylinder portion 16. The base portion 20 is a flat plate on which a column portion 21 is erected, and the cooling liquid passage 7 is provided in the column portion 21. A liquid passage pipe 22 is provided in the cooling liquid passage 7. The electrode holding cylinder portion 16 is fitted onto the columnar portion 21 of the base portion 20. The tip of the cylindrical portion 21 of the base portion 20 is exposed in the electrode holding cylindrical portion 16 and is provided with a substantially conical concave current-carrying portion 6 that is in contact with the substantially conical base end 3 of the electrode 1. A plurality of steel ball projecting holes 17 are provided so as to penetrate the side surface of the electrode holding cylinder portion 16 in the radial direction.

The outer slide cylinder portion 13 is fitted onto the electrode holding cylinder portion 16 so as to be movable in the axial direction. The spring 14 is the electrode holder 5
And a slide outer cylinder portion 13 are provided between the slide outer cylinder portion 13 and the slide outer cylinder portion 13 to urge the two in the axial direction. The slide outer cylinder 13 has a spring 14
The steel ball holding space portion 19 of the inclined wall surface 18 which is opened in the urging direction is provided on the inner peripheral portion.

A plurality of steel balls 15 are provided in contact with the inclined wall surface 18 of the steel ball holding space portion 19. The steel ball 15 is pushed by the inclined wall surface 18 of the slide outer cylinder portion 13 pushed by the spring 14 and the steel ball projecting hole 17
It is possible to partially project from the inside into the electrode holding cylinder portion 16. Steel ball 15
Is larger than the diameter of the steel ball projecting hole 17. These protruding steel balls 15 are held by the groove portions 11 provided in the ring portion 10 of the electrode 1. In this way, the force of the spring 14
Is transmitted to the steel ball 15, and the steel ball 15 is pressed against the electrode 1 to hold the electrode 1.

 22 and 23 are objects to be welded. 24 is the opposite electrode.

According to the configuration of this embodiment, the cooling liquid passage 7 is provided only in the electrode holder 5, and since the cooling liquid does not flow into the electrode 1, liquid leakage does not occur. Since the cooling liquid does not scatter to the surroundings even when the electrodes are replaced, it is possible to prevent the occurrence of electric leakage and is safe. In addition, since the liquid leakage prevention process (stopping the flow of the cooling liquid, etc.) is not required at the time of replacement work, the work is simple.

An electrode 1 extending from the base end 2 to the tip 3 side and having a built-in heat pipe 4 was provided, and a cooling liquid passage 7 was provided in the electrode holder 5 passing near the energization contact portion 6 in contact with the base end 2 of the electrode 1. Therefore, the heat generated at the tip 3 of the electrode 1 is efficiently transmitted to the electrode holder 5 side through the heat pipe 4 and then to the cooling liquid passage 7. Therefore, the cooling effect of the electrode 1 is high and the life of the electrode is long.

Furthermore, if the outer slide cylinder portion 13 is moved toward the electrode holder 5 side against the spring 14, a gap is created between the steel ball 15 and the inclined wall surface 18, and the steel ball 15 is inserted into the electrode holding cylinder portion 16. The protrusion of is freely released. Therefore, the replacement work by attaching and detaching the electrode 1 is easier.

Since the base end 2 has a substantially conical shape, the contact area with the current-carrying contact portion 6 is wide, and the power supply is good.

The electrode body 8 of the electrode 1 and the energizing portion 9 may be integrally formed. The ring portion 10 may be included and integrated.

The base portion 20 of the holder body 12 of the electrode holder 5 and the electrode holding cylinder portion 16 may be integrally formed.

The spring 14 may be biased to attract the electrode holder 5 and the slide outer cylinder portion 13. Even in that case,
The inclined wall surface 18 of the steel ball holding space portion 19 of the slide outer cylinder portion 13 is
It may be opened in the biasing direction of the spring 14.

The connection structure of this embodiment can be used for the electric discharge machining electrode and the caulking tool.

〔The invention's effect〕

According to the connection structure of the electrode for the resistance welding machine of the present invention, since the cooling liquid passage is provided only in the electrode holder and the cooling liquid does not flow into the electrode, liquid leakage does not occur. Since the cooling liquid does not scatter to the surroundings even when the electrodes are replaced, it is possible to prevent the occurrence of electric leakage and is safe. In addition, since the process of liquid leakage prevention (stopping the flow of cooling liquid etc.) is not required during replacement work,
The work is simple.

Since an electrode that extends from the base end to the tip side and has a built-in heat pipe is provided, and a cooling liquid path that passes near the current-carrying contact portion that contacts the base end of this electrode is provided in the electrode holder, the heat generated at the tip of the electrode is provided. Is efficiently transmitted to the electrode holder side through the heat pipe and then to the cooling liquid passage. Therefore, the electrode cooling effect is high and the electrode life is long.

Furthermore, by sliding the sliding outer cylinder against the spring, the hard sphere is not pushed by the slanted wall surface, so the hard sphere can move radially outward and away from the groove. It can be removed from the department. Therefore, since the electrode can be easily attached to and detached from the electrode holder, the electrode can be easily replaced.

[Brief description of drawings]

FIG. 1 is a sectional side view of an embodiment of the present invention, FIG. 2 is an exploded view thereof, FIG. 3 is a sectional side view of a conventional electrode welding structure for a resistance welding machine, and FIG. It is a block diagram. 1 ... Electrode, 2 ... Base end, 3 ... Tip, 4 ... Heat pipe, 5 ... Electrode holder, 6 ... Conductive contact part, 7 ... Electrode, 8 ... Electrode body, 9 ... Department, 10 …… Ring department,
11 …… groove part, 13 …… slide outer cylinder part, 14 …… spring, 15 …… hard ball, 16 …… cylindrical part, 17 …… rigid ball projecting hole, 18…
… Sloping wall

Claims (1)

[Claims] 1. A current-carrying portion that extends from a base end to a tip side and has a built-in heat pipe, and a ring portion that is provided around the current-carrying portion and has a groove portion in a circumferential direction of the outer circumference. An electrode having an electrode body provided at the tip of the portion, and a current-carrying portion having a current-carrying contact portion in contact with the base end, and a cylindrical portion having a hard-ball protruding hole that is fitted onto the ring portion and aligns the groove portion. An electrode holder having therein a cooling liquid passage passing near the current-carrying contact portion, a rigid sphere fitted into the rigid sphere projecting hole and capable of being engaged with and disengaged from the groove, and slidably on the cylinder. A slide outer cylinder part having an inclined wall surface formed on the inner surface for externally fitting and pushing the rigid sphere to lock the groove; and a slide outer cylinder part with respect to the electrode holder so that the inclined wall surface pushes the rigid sphere. Connection of electrodes for a resistance welding machine equipped with a spring that biases the Continuation structure.