JPH09168874A - Repair method of spot welding rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable repair near the center point at the tip end of an electrode and to excel in the discharge of chips by cutting through the rotation of plural projections while they are guided on the inclined face at the tip end of an electrode and discharging downward through communicative holes the chips produced in cutting the electrode. SOLUTION: A rotary blade 1 for repair is enclosed by a rotary frame with a bolt screwed into the recessed part in the outer circumferential wall of the rotary blade 1. Then, with the rotary frame rotated in a state where the tip end of an electrode is inserted in the recessed part of the rotary blade 1, the tip end of the electrode is cut by the blade formed on the inclined edge of the projections. In this case, two inclined edges for one projection, namely, four or more inclined edges strike the tip end of the electrode and support it, securing the concentricity against the tip end of the electrode. In addition, the ceiling part of the electrode is cut by the upper edge 3a of the diametrical line and the upper edge 3b of the eccentricity, with the grinding performed for the tip end of the electrode. The chips at the time of grinding fall downward through communicative holes 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The welding method in which two stacked metal plates are sandwiched by two electrode rods that can move back and forth, a large current is passed between the electrode rods, and the metal plates are heated and pressure-welded by resistance heat of the current. Is called spot welding. In this spot welding, when the tip of the electrode rod is worn and deformed,
The shape is shaved to repair. The present invention relates to a rotary blade for repairing a tip of an electrode rod.

[0002]

2. Description of the Related Art The tip of an electrode rod has a truncated cone shape. Therefore, the repair work is performed by cutting the tip of the electrode rod into a truncated cone shape. This cutting uses a flat file,
Often done manually. However, the flattened means is inaccurate and time-consuming. Further, as a means that does not depend on flat files, there is a method in which a frustum-shaped conical recess is provided on both upper and lower surfaces of a short column, and the conical surface is radially cut to form a cutting tool. In this rotary blade for repairing, the tips of the two electrode rods are fitted into the conical recesses of the blade for repairing and rotated while being pressed, whereby the tips of the electrode rods are scraped. However, when using this repairing blade, it is not possible to cut in the vicinity of the center point of the electrode rod tip, and it is difficult to discharge the generated chips, which reduces the sharpness with the generation of chips and shortens the life of the blade. Is inevitable.

[0003]

The present invention is capable of cutting in the vicinity of the center point of the tip of the electrode rod as compared with the above-mentioned conventional rotary blade for repair, is excellent in discharging chips, and has a long life. It is intended to provide a rotary blade for repairing a welding rod.

[0004]

A description will be given with reference to the drawings. A rotary blade 1 for repairing a spot welding rod according to the present invention includes a spot welding electrode rod 9 on both upper and lower surfaces of a short column 1a.
9 The recesses 2 and 2 corresponding to the tips are formed, and the notch 2b in the radial direction is provided on the peripheral wall 2a of the recesses 2 and 2 to form a plurality of protrusions 4, and the diameter passing through the center point Q of the recess bottom surface 2c. A ridge 3 having an eccentric upper edge 3b formed by a shallow groove 6 parallel to the diametric line upper edge 3a is formed on the concave bottom surface 2c on one side and the other on the line upper edge 3a. 2c is provided with a communication hole 5 that connects the upper and lower surfaces.
The shallow groove 6 is communicated with.

As shown in FIGS. 7 and 8, the rotary blade 1 for repair is surrounded by a rotary frame 8 and a bolt 8a is screwed into a recess 1b on the outer peripheral wall of the rotary blade 1. When the rotary frame 8 is rotated in the M or N direction with the tips of the electrode rods 9 and 9 fitted in the recesses 2 and 2 of the rotary blade 1, the blade portions formed on the inclined edges 4a of the protrusions 4 cause the electrode rods to rotate. Cut 9 At this time, at the same time, the ceiling surface of the electrode rod 9 is shaved by the diameter line upper edge 3a and the eccentricity upper edge 3b to scrape off the electrode rod. Chips at the time of cutting fall down through the communication holes 5.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Recesses 2 and 2 corresponding to the tips of spot welding electrode rods 9 and 9 are formed on both upper and lower surfaces of a short column 1a, and a radial cutout 2b is formed on a peripheral wall 2a of the recesses 2 and 2. An eccentric upper edge formed by providing a plurality of protrusions 4 and having a diametrical line upper edge 3a passing through the center point Q of the recess bottom surface 2c as one side and the other side being a shallow groove 6 parallel to the diametrical line upper edge 3a. A ridge 3 having 3b is formed on the bottom surface 2c of the recess, a communication hole 5 connecting the upper and lower surfaces is provided on the notch 2b and the bottom surface 2c of the recess, and the shallow groove 6 is connected to the communication hole 5.

Reference numeral 6 denotes a groove provided for forming the ridge 3, which communicates with the communication hole 5. Reference numeral 1b denotes a concave portion provided in the short column 1a for mounting the rotating frame 8.

[0008]

[Effects of the Invention] Compared to conventional rotary blades for repair, it is possible to cut rods near the center point of the electrode rod tip, excels in chip discharge, and can be used as rotary blades for repairing spot welding rods with long life. .

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a left side view showing an embodiment of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a sectional view taken along line CC of FIG.

FIG. 7 is a view corresponding to FIG. 4 showing a usage state.

FIG. 8 is a view corresponding to FIG. 6 showing a usage state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary knife 1a short column 1b recess 2 concave 2a peripheral wall 2b notch 2c bottom 3 protrusion 3a diameter line upper edge 3b eccentric upper edge 4 protrusion 4a slanted edge 5 communicating hole 6 shallow groove 6a bridge 8 rotating frame 8a bolt 9 Q center point

[Procedure amendment]

[Submission date] December 18, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title of invention Repair method for spot welding rod

[Claims]

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to two stacked metal plates that are sandwiched by two welding rods that can move forward and backward, and a large current is passed between the electrodes.
A welding method in which a metal plate is heated and pressed by resistance heat of an electric current is called spot welding. In this spot welding, when the tip of the electrode is worn and deformed, it is shaved to repair the shape. TECHNICAL FIELD The present invention relates to a repair method for shaving an electrode tip.

[0002]

2. Description of the Related Art The tip of an electrode has a truncated cone shape. Therefore, the repair work is performed by cutting the tip of the electrode into a frusto-conical shape. This cutting is often performed by hand using a flat file. However, the flattened means is inaccurate and time-consuming. Further, as a means that does not depend on flat files, there is a method in which a frustum-shaped conical recess is provided on both upper and lower surfaces of a short column, and the conical surface is radially cut to form a cutting tool. In the repair by the repair rotary blade, the tips of the two electrodes are turned in a state where the tips of the two electrodes are fitted into and pressed against the conical recesses of the repair blade, thereby shaving the tips of the electrodes. However, when using the repair method using this blade, cutting near the center of the electrode tip cannot be performed,
In addition, it is difficult to discharge the generated chips, it is inevitable that the sharpness is reduced with the generation of the chips, and the life of the blade is shortened. Furthermore, there is also a type in which a plate-like blade is inserted into a diametrical slot at right angles in a non-intersecting manner above and below the columnar holder, but since the blade is arranged on the same vertical plane, the electrode The alignment with the tip was poor and the processing accuracy was poor.

[0003]

SUMMARY OF THE INVENTION The present invention is a method for repairing a spot welding rod, which is capable of cutting in the vicinity of the center point of the electrode tip as compared with the above-described conventional rotary blade for repair, and which is also excellent in chip discharge. Is to provide.

[0004]

A description will be given with reference to the drawings. In the spot welding rod repairing method according to the present invention, one side of the short column 1a is provided on the bottom portion 2c of the rotary cutting tool 1 having the recessed portions 2 corresponding to the tips of the spot welding rod electrodes 9 and 9 and the diameter of one side. The bottom of the electrode tip is scraped by the rotation of the narrow protrusions 3 aligned on the line, and the electrodes are rotated by the rotation of the plurality of protrusions 4 formed by the radial cutouts 2b provided on the inclined surface of the recess 2. The tip is inclined while being guided, and the chips generated by the scraping of the upper electrode are discharged to the lower side through the vertical communication hole 5 provided so as to avoid the projection 4 and the ridge 3.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION
The concave portions 2 and 2 corresponding to the tip of the 9 are formed. A ridge 3 having a diametrical line upper edge 3a passing through the center point Q of the bottom portion 2c of the recess as one side and an eccentric upper edge 3b passing through a position deviating from the center point Q on the other side is formed in the bottom portion 2c of the recess.

A radial cutout 2b is formed in the peripheral wall 2a of the recess 2.
Are provided to form a plurality of protrusions 4. A vertical communication hole 5 is provided avoiding the projection 4 and the ridge 3.

Reference numeral 6 denotes a groove provided for forming the ridge 3 and a communication hole 5.
Leads to. Reference numeral 6a denotes a bridge formed in the upper and lower grooves 6, 6 and connecting the ridge 3 and the periphery of the short column 1a, for reinforcing the ridge 3. Reference numeral 1b denotes a recess provided in the peripheral wall 2a of the short column 1a for mounting the rotary frame 8.

As shown in FIGS. 7 and 8, the rotary cutter 1 for repair is surrounded by a rotary frame 8, and bolts 8a are screwed into recesses 1b of the outer peripheral wall of the rotary cutter 1. When the rotary frame 8 is rotated in the M or N direction with the tips of the electrodes 9 and 9 fitted in the recesses 2 and 2 of the rotary blade 1, the tips of the electrodes 9 are formed by the blades formed on the inclined edges 4a of the protrusions 4. Sharpen. At this time, one protrusion 4
Since two inclined edges 4a, 4a, and thus four or more inclined edges contact the tip of the electrode 9 and support the electrode tip, concentric holding to the electrode tip is ensured. Further, the ceiling of the electrode 9 is shaved by the upper edge 3a of the diameter line and the eccentric upper edge 3b, and the tip of the electrode 9 is shaved. Chips at the time of cutting fall down through the communication holes 5.

[0009]

[Effects of the Invention] Compared with the conventional repair method, repairing near the center point of the electrode tip is also possible, discharge of chips is excellent, the centering of the electrode tip is good, machining accuracy is improved, and spot welding with a long service life is achieved. Can be used as a rod repair method.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a rotary blade used for implementing the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a left side view of FIG. 1.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a sectional view taken along line CC of FIG.

FIG. 7 is a view corresponding to FIG. 4 showing a usage state.

FIG. 8 is a view corresponding to FIG. 6 showing a usage state.

[Explanation of Codes] 1 rotary knife 1a short column 1b recess 2 recess 2a peripheral wall 2b notch 2c bottom 3 protrusion 3a diameter line upper edge 3b eccentric upper edge 4 protrusion 4a inclined edge 5 communicating hole 6 groove 6a bridge 8 rotating frame 8a Bolt 9 Electrode Q Center point

Claims (1)

[Claims] 1. A recess (2, 2) corresponding to the tip of a spot welding electrode rod (9, 9) is formed on both upper and lower surfaces of a short column (1a), and a peripheral wall (2a) of the recess (2, 2) is formed. A radial notch (2b) is formed in the groove to form a plurality of protrusions (4), and a diameter line upper edge (3
The eccentric upper edge (3b) formed by the shallow groove (6) whose one side is a) and whose other side is parallel to the upper edge (3a) of the diameter line.
Is formed on the bottom surface (2c) of the recess, and a communication hole (5) connecting the upper and lower surfaces is provided in the notch (2b) and the bottom surface (2c) of the recess, and the communication hole (5) is also formed. A rotary blade for repairing a spot welding rod, wherein the shallow groove (6) is communicated.