JPH08174228A - Pressure device for resistance welding - Google Patents

Abstract

PURPOSE: To eliminate piping to the moving part near electrode so as to make cooling possible by arranging communication for water supply paths with each other and water drain paths with each other on the sliding boundary face between inner peripheral face of a pressure cylinder and outer peripheral face of a pressure rod is maintained while a pressure rod is slided. CONSTITUTION: Cooling water is received into a supply port 15A from outside and is filled in an axial direction water supply groove 15C opened to an inner peripheral sliding face 11S of a pressure cylinder 11. The axial direction water supply groove 15C is extended in X axis direction and maintains communication to a traversing direction water supply opening path 19 during stroking of the pressure rod 12. The water filling the water supply groove 15C is caused to flow into a water supply opening path 19, passing through an axial direction water supply path 17 and reaches an inner cavity 13V inside an electrode 13 mounted to the tip of rod 12. The water, which cools the electrode, is caused to flow out to external drain piping through paths of (axial direction drain path 18 in rod 12) → (traversing direction drain opening path 20) → (axial direction drain groove 16C) → (drain neck part 16B) → (drain port 16A).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a water cooling mechanism for a welding electrode of a pressure welding device for resistance welding.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a welding electrode 43 mounted on the tip of a pressure rod 42 that slidably moves in a pressure cylinder 41 supplies electric power to and pressurizes a welding portion. Pressure devices are known. However, the welding electrode 43
It is attached to the pressure rod 42 via a water supply / drainage connector 44 for supplying and discharging cooling water. A water supply port 45 and a drainage port 46 for supplying and discharging cooling water to and from the welding electrode 43 are opened on the outer periphery of the connector 44. The cooling water passes through the internal cavity 43V of the electrode 43 from the water supply port 45 through the water conduit 47, cools it, and then is discharged from the drainage port 46 to the outside.

Since the water supply port 45 and the drainage port 46 move along with the movement of the pressure rod 42 when the pressurizing device is operated, the water supply and drainage port 46 to the water supply port 45 is moved.
Pipes that connect to the outside for drainage from water must be made of a flexible material such as rubber. But,
Pipes made of such materials have a relatively low durability against heat, spatter, etc. generated during welding, and are therefore prone to breakage due to repeated operation, which reduces the reliability of the welding device as a whole. .

Further, since there is a pipe to each of the ports 45 and 46 near the electrode 43, there is a problem that when a plurality of electrodes 43 are arranged, the existence of the pipe itself hinders the arrangement of the electrodes.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention is a resistance welding in which a cooling mechanism is improved so that cooling can be performed without requiring piping to a moving part near an electrode. It is an object of the present invention to provide a pressurizing device for use.

[0006]

In order to achieve the above-mentioned object, a resistance welding pressurizing device of the present invention is an internal water-cooling type welding which is attached to the tip of a pressurizing rod which slides in a pressurizing cylinder. In a resistance welding pressurizing device for supplying electric power and pressurizing a welding portion by means of electrodes for welding, a pressurizing cylinder is penetrated from its outer surface to inner peripheral surface in order to supply and drain cooling water to the electrode An opening on the inner peripheral surface of the pressure cylinder of the water supply channel and the drainage channel and an opening on the outer peripheral surface of the pressure rod of the water supply channel and the drainage channel penetrating the pressure rod from its outer peripheral surface to its tip are added. At the sliding interface between the inner peripheral surface of the pressure cylinder and the outer peripheral surface of the pressure rod, the water supply passage and the drainage passage are arranged to maintain communication with each other with respect to the movement of the pressure rod.

[0007]

The present invention connects the external pipes for water supply and drainage to the outer surface of the pressurizing cylinder, which is a stationary member, rather than the position where the external pipe is connected, not on the pressurizing rod side, which is a sliding member as in the prior art. Since it is sufficient to do so, it is not necessary to limit to a bendable pipe material as in the conventional case, and a material having high durability against heat and spatter during welding can be used. Further, since the pipe can be provided at a position distant from the electrodes, the pipe itself does not interfere with the case where a plurality of electrodes need to be arranged.

Hereinafter, the present invention will be described in more detail with reference to Examples.

[0009]

1 to 3 show a pressure welding device for resistance welding according to the present invention. FIG. 1 is a perspective view showing a main part of the pressurizing device, and FIG. 2 is a cooling water supply port 15A and a drain port 1 of FIG.
6A is a vertical sectional view taken along a line II-II, and FIG. 3 is a horizontal sectional view taken along a line III-III passing through the cooling water ports 15A and 16A in FIG.

The pressure welding device for resistance welding of the present invention shown in the drawing is
A pressure rod 12 is slidably housed in a pressure cylinder 11 having one end fixed to a base 10 for mounting on a support frame (not shown). The welding electrode 1 is attached to the tip of the pressure rod 12 penetrating the central portion of the cylinder cover 11A that seals the other end of the pressure cylinder 11 and protruding to the outside.
3 is installed.

Ports 15A and 16A for water supply and drainage which are opened to the outer peripheral surface 11P of the pressurizing cylinder 11 and can be connected to an external pipe (not shown), and a cylinder shaft on the inner peripheral sliding surface 11S of the pressurizing cylinder 11. Axial grooves 15C and 16C provided as elongated openings extending in the X direction, 15
Neck portions 15B and 16B that laterally connect A and 15C and 16A and 16C, respectively, form water channels 15 and 16 that penetrate from the outer peripheral surface 11P of the pressure cylinder 11 to the inner peripheral sliding surface 11S. Waterway 15 (1
5A, 15B, 15C) and water channel 16 (16A, 16)
B and 16C) have a similar configuration for water supply and drainage, and a pair is provided on the left and right of the cylinder axis X.

Inside the pressure rod 12, a pair of axial water channels 17 and 18 are formed on both sides of the axis X (common to the cylinder axis), one end of each of which is an electrode 13 attached to the tip of the rod 12. Communicates with the internal cavity 13V.
The other ends of the axial water channels 17 and 18 are connected to the outer peripheral sliding surface 12S of the rod 12 by the lateral opening channels 19 and 20, respectively.
Open to these lateral openings 19 and 20
Respectively face and communicate with the axial grooves 15C and 16C opened on the inner peripheral sliding surface 11S of the cylinder 11 described above.

The pressure rod 12 slides with respect to the pressure cylinder 11 at the sliding interface between the outer peripheral sliding surface 12S and the cylinder inner peripheral sliding surface 11S. During this sliding stroke, the lateral openings 19 and 20 of the pressure rod and the axial grooves 15C and 16C of the pressure cylinder are so shaped, dimensioned and positioned that they remain in communication with each other. In this device, water cooling of the electrode 13 is performed as follows.

That is, the cooling water is received in the water supply port 15A from the external water supply pipe (not shown), and the water supply neck portion 15 is supplied.
Through B, the inside of the axial water supply groove 15C that opens to the inner peripheral sliding surface 11S of the pressure cylinder 11 is filled. Axial water supply groove 1
5C extends in the direction of the axis X and maintains the communication with the lateral water supply opening 19 even during the stroke operation of the pressure rod 12, so that the water filling the water supply groove 15C is in the water supply opening 19. To reach the inside of the internal cavity 13V of the electrode 13 attached to the tip of the rod 12 through the axial water supply passage 17. The water that has cooled the electrode 13 is discharged from the cavity 13V [axial drainage channel 18 in the rod 12] → [lateral drainage channel 20] → [axial drainage channel 16C] → [drainage neck 16].
B] → [Drainage port 16A] to flow out to the external drainage pipe.

By supplying and draining water to the cylinder which is the immovable portion in this manner, the electrode mounted on the rod which is the movable portion can be continuously water-cooled during operation. Here, in order to always supply the cooling water to the electrode 13 during the operation of the pressurizing device, the communication between the lateral opening passages 19 and 20 and the axial grooves 15C and 16C must be maintained at all times during the operating of the pressurizing device. There is. However, if the following conditions are satisfied, a substantially effective electrode water cooling action can be secured even if communication is not always maintained during operation.

That is, generally, in one stroke cycle of the pressure rod 12, the time during which the welding portion is actually pressed is rather short, and the rod 12 is not pressed.
It takes much longer to be pulled into the standby position.
In such a situation, if the rod-side lateral openings 19 and 20 and the cylinder-side axial grooves 15C and 16C communicate with each other during the long time at the standby position, respectively, and the electrode 13 can be cooled, the rod 13 can be cooled. In most cases, the cooling action on the electrode 13 is substantially sufficient even if the above-mentioned communication is not maintained for a short period of time when the is protruding and is in the pressing position.

With such a structure in which the communication is maintained only during the standby period, the axial length of the axial grooves 15C and 16C can be shortened, which is advantageous in that the machining is facilitated.

[0018]

As described above, according to the present invention, water is supplied to the outer surface of the pressurizing cylinder, which is an immovable member, rather than the pressurizing rod side, which is a slidable member, at the position where the external pipe is connected. And since it is sufficient to connect the external pipe for drainage,
Unlike the conventional case, it is not necessary to limit to a bendable pipe material, and a material having high durability against heat and spatter during welding can be used. Further, since the pipe can be provided at a position distant from the electrodes, the pipe itself does not interfere with the case where a plurality of electrodes need to be arranged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a pressurizing device according to the present invention.

2 is a schematic view of the cooling water ports 15A and 16 of FIG.
FIG. 2 is a vertical sectional view taken along line II-II passing through A.

FIG. 3 is a view of cooling water ports 15A and 16 of FIG.
FIG. 3 is a horizontal sectional view taken along line III-III passing through A.

FIG. 4 is a sectional view showing a conventional pressure welding device for resistance welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Base for attachment to a support stand (not shown) 11 ... Pressurizing cylinder 11S ... Inner peripheral sliding surface of the pressurizing cylinder 11 P ... Outer peripheral surface of the pressurizing cylinder 11 11A ... Cylinder cover 12 ... Pressurizing rod 13 ... Welding electrode 13V ... Water cooling internal cavity of electrode 13 15 ... Water supply channel 15A ... Water supply port 15B ... Neck 15C ... Axial water supply channel 16 ... Drainage channel 16A ... Drainage port 16B ... Neck 16C ... Axial drainage channel 17 ... axial groove 18 ... axial groove 19 ... lateral opening passage 20 ... lateral opening passage 41 ... pressurizing cylinder 42 ... pressurizing rod 43 ... welding electrode 43V ... internal cavity 44 of electrode 43 ... water supply / drainage connector 45 ... Water supply port 46 ... Drainage port 47 ... Water conduit

Claims (3)

[Claims] 1. A resistance welding pressurizing device for supplying electric power to and pressurizing a welded part by means of an internal water-cooling welding electrode attached to the tip of a pressurizing rod slidable in a pressurizing cylinder. In order to supply and drain cooling water through the pressurizing cylinder, an opening in the inner peripheral surface of the pressurizing cylinder of the water supply channel and drainage path penetrating from the outer surface to the inner peripheral surface of the pressurizing cylinder, and the pressurizing rod at its outer periphery. The opening on the outer peripheral surface of the pressure rod of the water supply channel and the drainage channel penetrating from the surface to the tip end is used to make the pressure rod slide at the sliding interface between the inner peripheral surface of the pressure cylinder and the outer peripheral surface of the pressure rod. A pressure welding device for resistance welding, characterized in that it is arranged so as to maintain communication between the water supply channels and the drainage channels. 2. The pressure welding device for resistance welding according to claim 1, wherein the opening is arranged so as to maintain communication at the sliding interface over the entire range of the sliding movement of the pressing rod. . 3. The opening is arranged so as to maintain communication at the sliding interface only at a standby position in which no power is supplied and no pressure is applied, of the pressing rod sliding stroke. Item 1. A pressure welding device for resistance welding according to item 1.