JPH0465754B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention utilizes the pressurized operation of a resistance welding machine to convert linear motion into rotational motion, while keeping the tip of the electrode tip attached to the welding machine. This invention relates to a recycling device for cutting and forming.

<Prior Art> Electrode tips for resistance welding machines, especially spot welding machines, have dome-shaped, trapezoidal, and pimple-shaped tips, but these electrode tips cannot weld under pressure. If this continues, the tip will wear out, and when welding plated plates, an alloy layer will be formed on the tip of the electrode tip, causing welding defects.

In this case, with dome-shaped and trapezoidal electrode tips, the surface area of the tip increases as the tip wears out, resulting in a rapid deterioration of the welding condition.On the other hand, with a pimple-shaped electrode tip, the tip has a so-called ``navel'', so even if the tip wears out, the ``navel'' remains. Since there is almost no change in the tip surface area while the tip remains, the welded state is maintained relatively better than other types of tips. However, if the "belly button" disappears, the welding condition will inevitably deteriorate as in the above case.

Conventionally, the electrode tip with a worn tip was removed from the welding machine and cut and shaped using a special machine, or the electrode tip was left attached to the welding machine and reshaped manually using an air motor file. However, with the former, it takes time to attach and remove, and with the pimple type, it is difficult to center the opposing electrode tips when attaching the formed tips to a welding machine. In addition, in the latter case, where the labor is removed by attaching the welding machine to the welding machine, it not only requires skill, but also requires time and effort. In some cases, production may be hindered.

For this purpose, for example, as shown in the tip dresser for resistance welding machines shown in Publication No. 49-12468, two files are installed so that they can slide on slide rods in opposing directions with a spring sandwiched between them. It is known that the slide rod is pressed against the upper and lower electrode tips, respectively, and that the slide rod is driven to rotate together with the two files.

<Problems to be Solved by the Invention> However, in the above-mentioned Japanese Patent Publication Publication No. 2003-11000, since a file having a concave portion matching the shape of the tip of the dome-shaped electrode tip is used, it is difficult to polish the dome-shaped electrode tip. Even if it were possible, it is not possible to efficiently and precisely shape a pimple-shaped electrode chip, which has a relatively complex shape. In addition, in the above-mentioned publication, the two files are configured to be rotated by a worm wheel rotated by an electric motor or the like via a slide rod, so not only does it require separate power, but it also requires a resistance welding machine. Two operations are required: the operation of pinching the file between the upper and lower arms of the device, and the operation of rotating the file with an electric motor or the like via a slide rod.

The present invention provides a pimple-type electrode tip having the above-mentioned advantages, which can be accurately aligned while attached to the welding machine, and can be shaped automatically in a short time and in a relatively small size, without requiring additional power, and with a small force. This invention was devised for the purpose of providing a regeneration device for pimple-shaped electrode chips that can be regenerated.

<Means for solving the problem> The structure of the present invention for achieving the above object is as follows: from both ends of a cylindrical guide member 1 having a female thread 2 formed on its inner surface, to one side of a disc-shaped member 4 having a male thread provided on its outer periphery. A cutter 3, 3' for shaping a pimple-shaped electrode tip is attached to the cutter 3, 3', which has a concave portion 6 in the center that matches the navel diameter of the pimple-shaped electrode tip, and a concave hole 5 with a cutting edge 7 on the surface. A device for reproducing a pimple-shaped electrode chip is characterized in that a male screw is screwed into the female screw and elastically held by sandwiching spring members 9 and 10.

<Operation> The regeneration device of the present invention is placed between the upper and lower pimple-shaped electrode chips of the welding machine, and welding is performed with the tip of the electrode chip in contact with the cutting blade 7 of the pimple-shaped electrode chip shaping cutter 3, 3'. The machine is operated, and the upper and lower electrode chips are closed and pressurized in the same manner as when welding.

As a result, the shaping cutters 3, 3' are held by the spring members 9, 10 and are rotated in one direction by the screwing of the male thread 8 and the female thread 2 while moving toward the center of the guide member 1, thereby applying the pressure. When released, the tips of the upper and lower electrode chips are cut into a pimple shape because they are rotated in the opposite direction while being returned by the elastic force of the spring members 9 and 10, and by repeating this process, the tips are regenerated into a predetermined tip shape.

When molding is complete, stop applying pressure to the electrode tip,
When the gap between the two chips is opened, the rotation of the shaping cutter is stopped, and the shaping by the shaping cutter of the present invention is completed.

<Embodiment> In FIG. 1, reference numeral 1 denotes a cylindrical guide member, and a large lead female thread 2, which is one of the mechanisms for converting linear motion into rotational motion, is carved on the inner surface of the guide member. 3 and 3' are shaping cutters, in the illustrated example, a dovetail-shaped hole 5 is formed on one side of the disc-shaped member 4, and the diameter corresponds to the welding spot in a pimple-shaped electrode tip (not shown) in the center thereof. A recess 6 with a predetermined depth is formed in accordance with the diameter of the navel, and one or more cutting edges 7 are provided radially on the surface of the dome-shaped hole 5, and the outer periphery of the disc-shaped member 4 is provided with the guide member 1. A male thread 8 is formed to be threadedly connected to the female thread 2, and serves as the other part of the mechanism for converting linear motion into rotational motion.

Denoted at 9 and 10 are disc springs, which are disposed on both sides of a spring receiver 11 supported at the center of the female thread 2 of the guide member 1, and hold the shaping cutters 3 and 3', respectively.

The electrode chip regeneration device shown in FIG.
The male screw 8 is inserted into the female screw 2 while sandwiching the disk springs 9 and 10 therebetween, and stoppers 12 are fixed to both ends of the guide member 1 to prevent it from coming off.

When using the above electrode chip regeneration device,
Place the device between electrode tips (not shown) of a welding machine, and insert the tips of the electrode tips into shaping cutters 3, 3'.
While touching the cutting edge 7, the upper and lower electrode tips are closed and pressurized in the same manner as during welding.

As a result, the shaping cutters 3 and 3' are held by the disc springs 9 and 10, respectively, and are rotated in one direction by the conversion mechanism consisting of the male screw 8 and the female screw 2 while moving toward the center of the guide member 1. When the pressure is released, the tips of the upper and lower electrode tips are cut off because they return and rotate in the opposite direction due to the elastic force of the disk springs 9 and 10, and by repeating this process, they are regenerated into a predetermined tip shape, for example, a pimple shape. . When the shaping is completed, the pressure on the electrode tip is stopped and both tips are opened, and the shaping cutter stops rotating and the shaping is completed.

The reproduction device shown in FIG. 2 operates either the upper shaping cutter 3 or the lower shaping cutter 3' in the figure, and includes a guide member 1, a female thread 2,
Shaping cutters 3, 3', male screw 8 and stopper 1
2 is almost the same as that shown in FIG. 1, but there is only one pair of disc springs 13, and the following stop keys 14 and 15 are further provided. That is, the stop keys 14 and 15 connected by the connecting bar 16 move in the radial direction of the guide member 1 along the inside of the upper and lower stoppers 12, respectively, and their tips are connected to the upper shaping cutter 3 or the lower shaping cutter 3. The guide member 1 is configured to be freely retractable into holes 17, 17' formed in the guide member 1 so as to alternately engage with the male threads 8 of the shaping cutter 3' to stop the rotation of the cutter 3 or 3'.

Here, when shaping the upper electrode chip 3, for example, pull out the stop key 14 from the hole 17 using the connecting bar 16 as shown in FIG.
When the cutter 3' is stopped by inserting it into the hole 17' and engaging the tip with the male screw 8 of the shaping cutter 3', the cutter 3' will stop. At this point, as mentioned above, connect the regeneration device shown in Fig. 2 to the electrode tip of the welding machine ( (not shown),
With the tips of the electrode tips in contact with the cutting blades 7 of the shaping cutters 3, 3', the upper and lower electrode tips are closed and pressurized in the same manner as during welding. As a result, the shaping cutter 3 is held by the disc spring 13 and is rotated in one direction by the conversion mechanism consisting of the male screw 8 and the female screw 2 while moving toward the shaping cutter 3', and when the pressure is released, Since it rotates in the opposite direction while returning under the elastic force of the disk spring 13, only the tip of the upper electrode tip is cut off, and by repeating this process, the tip is regenerated into a predetermined tip shape. When shaping the lower electrode chip, use the connecting bar 16 to insert the stop key 15 into the hole 1 in the opposite manner as described above.
7', insert the stop key 14 into the hole 17, and engage the tip with the male screw 8 of the shaping cutter 3.

In the device shown in FIG. 3, instead of the disc spring in the playback device shown in FIGS. It is inserted through several holes 19 drilled around the vicinity and holds the shaping cutters 3, 3' elastically, and the other elements are the same as those shown in FIGS. 1 and 2.

When shaping electrode chips using the electrode chip regeneration device shown in FIG. 3, place the chips between the upper and lower electrode chips of the welding machine in the same way as shown in FIGS. 1 and 2. With the tips touching the cutting blades 7 of the shaping cutters 3, 3', the upper and lower electrode tips are closed and pressurized in the same manner as during welding.

As a result, the shaping cutters 3 and 3' are each twisted and held by the leaf spring 18, and are rotated in one direction by the conversion mechanism consisting of the male thread 8 and the female thread 2 while moving toward the center of the guide member 1. is,
When the pressure is released, the tips of the upper and lower electrode chips are cut because they are rotated in the opposite direction while being returned by the elastic force of the leaf spring 18, and by repeating this process, the tips are shaped into a predetermined tip shape.

<Effects of the Invention> The electrode chip regeneration device of the present invention has a cylindrical guide member 1 having a female thread 2 formed on its inner surface from both ends.
A pimple-shaped electrode chip has a concave part 6 in the center on one side of a disk-shaped member 4 having a male thread on its outer periphery, which matches the navel diameter of the pimple-shaped electrode chip, and a concave hole 5 with a cutting edge 7 on the surface. Since the electrode tip shaping cutters 3 and 3' are elastically held by sandwiching the spring members 9 and 10 while the male screw is screwed into the female screw, centering can be performed while the pimple-shaped electrode tip is attached to the welding machine. It is possible to shape the welding machine accurately, in a short time, and without requiring special power by utilizing the pressure function of the welding machine itself.
It is possible to provide a regeneration device for pimple-shaped electrode chips that can be made simple and compact, easy to handle, and less prone to failure.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the electrode chip regeneration apparatus of the present invention, FIG. 2 is a longitudinal sectional view of another embodiment, and FIG. 3 is a longitudinal sectional view of still another embodiment. 1... Cylindrical guide member, 2... Female thread, 3,
3'... Shaping cutter, 4... Disk-shaped member, 5...
...Dovetail hole, 7...cutting edge, 8...male thread,
9, 10, 13... Disc spring, 14, 15... Stop key, 16... Connection bar, 18... Leaf spring.

Claims (1)

[Scope of Claims] 1. From both ends of a cylindrical guide member 1 having a female thread 2 formed on its inner surface, a recess 6 matching the navel diameter of a pimple-shaped electrode tip is formed in the center on one side of a disk-shaped member 4 having a male thread formed on its outer periphery. Then, the pimple-shaped electrode tip shaping cutters 3, 3', each having a dovetail-shaped hole 5 with a cutting edge 7 on its surface, are screwed into the female threads and the spring members 9, 10 are screwed together. A regeneration device for a pimple-shaped electrode chip characterized by being held elastically by being pinched. 2. The apparatus for regenerating pimple-shaped electrode chips according to claim 1, further comprising means for alternately operating the pimple-shaped electrode chip shaping cutters arranged at both ends of the cylindrical guide member.