JP3189631U - Aluminum panel correction dedicated bit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum panel correction dedicated bit capable of adjusting a welding state of a standing bit by raising a welding direction with a finger and finely adjusting an angle even when the welding state is not adjusted. PROBLEM TO BE SOLVED: To form a leg piece 3A extending from a surface formed by a flat bit body 2A provided with a through hole 5A. The bit 1A is formed of aluminum to have a height at the leg height, and when the width of the leg piece is W and the thickness is T, the width W is 4 to 6 mm and the thickness T is 1.2 to 1.8 mm. Form as. The tip of the bit is melted by arc discharge and welded to the sheet metal surface. A through hole 5A through which a push rod can be inserted is formed as an elongated hole in the bit body 2A. [Selection diagram] Fig. 1

Description

The present invention relates to a bit dedicated to repairing an aluminum panel. For example, in order to recover and repair a dent recess formed on an outer (side) plate of an automobile body formed of an aluminum plate, an arc is used with a bit welding gun. The present invention relates to an aluminum panel correction-dedicated bit suitable for repairing a dent recess in an aluminum panel by welding to the dent recess by discharge.

The outer plate of an automobile body is often recessed due to an external impact. When the outer plate is single, the dent recess can be repaired relatively easily by hitting it with a hammer, a jig or the like. However, when the outer plate is double inside and outside like a front fender part and a door part, it cannot be repaired by hitting. In such a case, a metal ring member (round washer-shaped repair piece) 1C (FIGS. 29 to 31) of a 5-yen coin size is brought into contact with the substantially central portion of the concave portion of the outer plate of the door portion that cannot be disassembled (patents). Document 1, Patent Document 2), the repaired piece is resistance-welded using a welding gun, and the dent is repaired by hooking a rod-shaped member or attachment to the repaired piece and pulling it outward, which is almost the original shape. After recovering the shape, the repair piece is cut and removed by a grinder and then shaped.

The welding gun used for resistance welding of the repair piece is a manual pressurization type, and when the vehicle body outer plate is made of a steel plate, the pressing force of the welding gun is 20 to 30 kg and the welding current is about 1000 to 1500 A. As a result, the welding current flows from the welding transformer via the cable to the welding piece set on the tip of the welding gun and the outer plate, and then flows back to the welding transformer via the cable. It is welded by heat generated by the contact resistance.

However, when using the repair piece (annular member) welded to the sheet metal surface,
(1) When the annular member (repair piece) is welded to a sharp protrusion, the welded portion is close to point contact, so that it is easy to remove the weld during sheet metal work (FIGS. 29 and 30).
(2) In the case where the lead-out location is a deep groove, welding is performed across these locations and the welding area becomes wider, making welding actually impossible (Fig. 31).
(3) If there is a place where you want to heat or strike near the welded annular member, the entire repair piece will be in the way, and you will not be able to secure a space for placing the tool, etc. ,
There are disadvantages such as.

Japanese Utility Model Publication No. 62-27290 JP-A-6-246453

Incidentally, in recent years, an aluminum plate (or an aluminum alloy plate) has been used as a vehicle body outer plate in order to reduce the weight of a structural material (for example, a vehicle body) of an automobile. Aluminum is about twice as strong as mild steel, and when trying to obtain parts with the same strength in strength design, the use of aluminum can reduce the weight to nearly half that of mild steel materials.

Even when plywood is used for the car body outer plate, the pressing force that presses the repair piece against the dent recess of the outer plate with the welding gun is not constant, and there is a problem that welding cannot be performed uniformly, In the vehicle body outer plate using an aluminum plate, the pressing force of the repair piece and the welding current are required to be 3 to 4 times or more as compared with the steel plate, so that the resistance welding method cannot be used for welding.

Furthermore, due to the difference in metal characteristics between aluminum and mild steel, the following problems are inherent in aluminum welding.
(1) Easy to oxidize during heating.
(2) There is an oxide film on the surface of the base material.
(3) poor heat concentration and low melting point,
(4) Easy to melt away,
(5) Easily distorted,
(6) Prone to blow holes.
(7) The tendency of weld cracking is great.
(8) Aluminum is an alloy, and it is necessary to use different filler materials.

For this reason, the appearance of a dedicated bit for repairing an aluminum panel and a welding gun for the bit suitable for restoring and repairing the dent recess formed on the outer plate of the automobile body formed of an aluminum plate is desired. When welding the aluminum bit to the dent recess using a gun,
(1) If the welding area of the aluminum bit tip is too large, a high current value is required, so the bit tip may melt.
(2) On the other hand, if the welding area of the welded tip of the aluminum bit is small, the bit tip will tear off from the outer plate after welding, making it impossible to perform sheet metal work.
(3) The aluminum bit is formed so that it can be used multiple times because the material is expensive.
It is necessary to satisfy at least.

Therefore, due to the physical properties of aluminum, it is extremely difficult to weld thin objects on the body outer plate of an aluminum automobile body with a thickness of about 1 mm. When welding aluminum bits by arc welding, welding to the aluminum plate is very difficult. Requires very advanced technology.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an aluminum panel that can stably perform sheet metal work by stabilizing the welding state of a vehicle body outer sheet formed by an aluminum plate to a sheet metal portion. The purpose is to provide a modification-only bit.

Another object of the present invention is to place the sheet metal work on the outer plate of the automobile body formed of an aluminum plate in an extremely difficult position, such as a groove or a deep groove, in parallel with the drawer portion. The purpose is to provide a special bit for repairing an aluminum panel that can be welded and can efficiently perform sheet metal work.

Another object of the present invention is to provide an aluminum panel correction-dedicated bit capable of performing a knocking operation to the vicinity of a welding point of an automobile body outer plate formed of an aluminum plate.

Another object of the present invention is to provide an aluminum panel correction-dedicated bit that can cut the tip of the bit even when the used bit is welded to an aluminum plate and can be used repeatedly by cutting.

Yet another object of the present invention is to provide a leg piece whose tip is a welded portion, so that the bit can be formed at a leg height and the leg piece and the bit body are twisted. To provide a dedicated bit for repairing an aluminum panel that can be welded easily and in a stable state even when the sheet metal surface is a deep groove or an acute angle line, and that allows sheet metal work to proceed smoothly and efficiently. is there.

Yet another object of the present invention is to provide a special bit for repairing an aluminum panel, which can adjust the welding state of the bit to stand by raising the welding direction with a finger and adjusting the angle even if the welding state is not prepared There is to do.

Means for solving the problem

An aluminum panel correction-dedicated bit according to the present invention is a bit formed by extending a leg piece from a surface formed by a flat bit body having a through hole, and the bit is formed at a leg height with aluminum, When the width of the leg piece is W and the thickness is T, the width W is 4 to 6 mm and the thickness T is 1.2 to 1.8 mm. The tip of the bit is melted by arc discharge and welded to the sheet metal surface. An aluminum bit for correcting an aluminum panel, characterized in that it is possible.

Furthermore, the aluminum bit for correcting an aluminum panel includes a screw part formed by twisting a base end part of the leg piece, and the width direction of the leg piece is positioned in the same direction as the penetration direction of the through hole. The leg piece can be formed so that the tip of the leg piece serves as a welded portion.

The bit is preferably formed in a configuration that can be used repeatedly by cutting the bit tip.

It is preferable that the bit is formed so that the welding state of the standing bit can be adjusted by raising the welding direction of the leg piece with a finger using the welded portion of the leg piece as a fulcrum and finely adjusting the angle.

When welding an aluminum bit to a dent recess using a bit welding gun, the aluminum bit is welded by a method in which aluminum is melted by arc discharge. As mentioned above, aluminum bits are expensive and are required to be used repeatedly. In welding aluminum bits by arc discharge,
(1) If the width of the welded end of the aluminum bit is widened and the welded area is too wide, a high current value is required, and the tip of the aluminum bit is likely to melt.
(2) On the other hand, if the width of the welded end of the aluminum bit is reduced and the welded area is reduced, the current value can be reduced. However, the weld between the aluminum bit and the outer plate is not sufficient, so the bit tip is torn off from the outer plate after welding. It is easy to detach, and if it detaches, it will not be possible to perform sheet metal work.
It is necessary to consider at least (1) and (2).

Furthermore, as a welding condition for melting the bit tip by arc discharge, the bit tip is melted well,
(A) Current value sent when welding,
(I) Timing to pull up aluminum bit during arc discharge by bit welding gun,
(C) Timing to return the bit after arc discharge,
(D) The welded part of the bit has sufficient strength to enable the dent recess to be lifted by the pulling force applied to the bit after welding the bit to the aluminum panel.
(A) to (D) are important.

If the width of the leg piece is less than 4mm, the strength of the aluminum bit will be weak and it will not be possible to pull out the corrected part. On the other hand, if it exceeds 6mm, the bit will be bent to make it easier to pull out the bit when welded. Only the welding is removed. Furthermore, if the leg piece thickness is less than 1.2 mm, the tip is twisted when the welding is released after completion of the sheet metal work, and the next use becomes impossible, and if it exceeds 1.8 mm, the welding to the sheet metal surface is performed. The sticking by becomes worse. Therefore, when the width of the leg piece is W and the thickness is T, it is important that the aluminum bit is formed with a width W of 4 to 6 mm and a thickness T of 1.2 to 1.8 mm as described above. is there.

Action

When welding the bit according to the present invention to the aluminum outer plate, it is preferable to weld using the bit welding gun described in this specification. When welding an aluminum bit, in the bit welding process, with the bit tip in contact with the sheet metal surface before the bit welding, the bit tip is held against the return spring that constitutes the bit guide return mechanism of the bit welding gun. Push in the sheet metal side. In this state, the trigger switch of the bit welding gun is pressed and the bit is pulled up by the solenoid constituting the converter to cause arc discharge to melt the bit tip and the sheet metal surface. At the time of bit welding, the bit is pushed into the sheet metal surface and welded. That is, the bit guide return mechanism set on the left and right sides of the slide core of the bit welding gun pushes the bit into the sheet metal surface as much as the bit melts and shortens during discharge, and the bit and sheet metal surface The bits are securely welded so that the welding position does not change.

It is preferable that the injection gas injected from the first gas supply path and the second supply path formed in the bit welding gun is uniformly injected to the bit.

Effect of device

The present invention is configured as described above and has the following effects.
(1) The welding state of the outer plate of the automobile body formed of the aluminum plate to the sheet metal portion is stable, and an aluminum panel correction dedicated bit capable of reliably performing the sheet metal work is obtained.
(2) Even in places where it is extremely difficult to perform sheet metal work in the sheet metal work of an automobile body outer plate made of an aluminum plate, such as a groove or deep groove, it can be welded in parallel with the drawer part. This makes it possible to obtain an aluminum panel correction-dedicated bit that can efficiently perform sheet metal work.
(3) An aluminum panel correction-dedicated bit that can be knocked to the vicinity of the welding point of the car body outer plate formed of an aluminum plate is obtained.
(4) Because the leg piece is formed at the leg height, the bit tip can be cut even when the used bit is welded to the aluminum plate, and the aluminum panel can be used repeatedly by cutting the bit tip. A dedicated bit is obtained.
(5) By providing a leg piece whose tip is the welded portion and forming the leg piece and the bit body to be twisted, welding can be easily performed even if the sheet metal surface is a deep groove or an acute line. It is possible to obtain a dedicated bit for repairing aluminum panels that can be kept in a stable state and can proceed with sheet metal work smoothly and efficiently.
(6) Even if the welded state is not prepared, the leg pieces are flexible so that the welding direction of the bit can be adjusted by slightly raising the angle by raising the welding direction with your finger. can get.

It is a perspective view which shows the 1st Example of the aluminum panel correction exclusive bit which concerns on this invention. FIG. 2 shows an example of the usage state of the bit shown in FIG. 1, showing a state in which a plurality of bits are welded to an aluminum outer plate of an automobile body, and even if the bit is welded slightly obliquely, it is raised by a finger and finely adjusted. It is a side view which shows that the welding state of the bit of a book can be prepared. It is a perspective view which shows an example of the use condition of the bit shown in FIG. 1, and welds a bit to the corner | angular part of the square pillar of the quarter panel of the motor vehicle body formed with the aluminum plate of the motor vehicle body, and performs sheet metal work. It is a perspective view which shows that the front-end | tip part is cut and can be reused after welding the bit shown in FIG. It is a perspective view which shows the 2nd Example of the aluminum panel correction exclusive bit which concerns on this invention. FIG. 6 shows a front view of the bit shown in FIG. 5. It is a perspective view which shows an example of the use condition of the bit shown in FIG. It is a perspective view which shows the other usage example of the bit shown in FIG. FIG. 9 is a schematic cross-sectional view of FIG. 8. FIG. 6 is a perspective view showing another example of use of the bit shown in FIG. 5. FIG. 11 is a schematic plan view of FIG. 10. FIG. 6 is a perspective view showing another example of use of the bit shown in FIG. 5. It is a perspective view which shows the usage example of the bit of the state of FIG. FIG. 14 is a schematic cross-sectional view of FIG. 13. FIG. 6 is a perspective view showing still another usage example of the bit shown in FIG. 5. FIG. 6 is a perspective view showing still another usage example of the bit shown in FIG. 5. FIG. 6 is a perspective view showing still another usage example of the bit shown in FIG. 5. It is a perspective view which shows the state which attaches the bit shown in FIG. 1 to the bit welding gun suitable for welding the bit which concerns on this invention. It is a disassembled perspective view which shows the component of the bit welding gun shown in FIG. It is a front view which shows the state which attached the bit shown in FIG. 1 to the bit welding gun shown in FIG. It is a side view which shows the state which attached the bit shown in FIG. 1 to the bit welding gun shown in FIG. It is XX cross-section schematic in FIG. It is a perspective view which shows the set state which attached the bit shown in FIG. 1 to the bit welding gun shown in FIG. 18, and was connected to the welding machine. It is a perspective view which shows the state which attached the bit shown in FIG. 1 to the welding machine etc. attached to the bit welding gun shown in FIG. 18, and is attaching the bit to the recessed part of a motor vehicle door, supplying gas. It is a block diagram which shows the structure outline of a welding machine. It is a front view which shows the operation panel which comprises the welding machine. It is the progress figure which shows the operation procedure of the bit welding gun shown in FIG. 18, and is the schematic which looked at the bit welding gun from the side. It is the progress figure which shows the operation procedure of the bit welding gun shown in FIG. 18, and is the schematic which looked at the bit welding gun from the front. The usage example of a prior art is shown. The usage example of a prior art is shown. The usage example of a prior art is shown.

Embodiments of an aluminum panel correction dedicated bit according to the present invention will be described below with reference to the drawings.

1 to 4, an aluminum panel correction-dedicated bit 1A according to the present invention is formed by extending leg pieces 3A from a surface formed by a flat bit body 2A provided with a through hole 5A. This bit 1A is made of aluminum and has a leg height, and when the width of the leg piece is W and the thickness is T, the width W is 4 to 6 mm and the thickness T is 1.2 to 1. .8 mm. Then, the tip of the bit is melted by arc discharge and can be welded to the sheet metal surface 9. The bit body 2A is formed with a through hole 5A through which the push rod 7 can be inserted as a long hole. The tip portion of the leg piece 3A is tapered to form a welded portion.

As described above, welding the aluminum bit 1A to the dent recess 9 using the bit welding gun 10 is performed by melting and welding aluminum by arc discharge. However, since the aluminum bit is expensive, it can be used repeatedly. Desired. And in welding aluminum bits by arc discharge,
(1) If the width of the welded end of the aluminum bit is widened and the welded area is too wide, a high current value is required, and the tip of the aluminum bit is likely to melt.
(2) On the other hand, if the width of the welded end of the aluminum bit is reduced and the welded area is reduced, the current value can be reduced. However, the weld between the aluminum bit and the outer plate is not sufficient, so the bit tip is torn off from the outer plate after welding. It is easy to detach, and if it detaches, it will not be possible to perform sheet metal work.
Therefore, as described above, when the width of the leg piece is W and the thickness is T, it is important that the width W is 4 to 6 mm and the thickness T is 1.2 to 1.8 mm.

Furthermore, as described above, in order to melt the bit tip by arc discharge of the aluminum bit and perform the welding of the bit well, as a welding requirement,
(A) Current value sent when welding,
(I) Timing to pull up the aluminum bit during arc discharge with a bit welding gun,
(C) Timing to return the bit after arc discharge,
(D) The welded part of the bit has sufficient strength to enable the dent recess to be lifted by the pulling force applied to the bit after welding the bit to the aluminum panel.
(A) to (D) are important.

According to the inventor's knowledge, when the width of the leg piece is less than 4 mm, the strength of the aluminum bit is weak and it is not possible to draw out the corrected portion. On the other hand, when it exceeds 6 mm, the bit is pulled out without flexibility when welded. To make it easier, just bend the bit to remove the weld. Furthermore, if the leg piece thickness is less than 1.2 mm, the tip is twisted when the welding is released after completion of the sheet metal work, and the next use becomes impossible, and if it exceeds 1.8 mm, the welding to the sheet metal surface is performed. Since the sticking due to the above becomes worse, when the width of the leg piece is W and the thickness is T, the aluminum bit is formed with the width W of 4 to 6 mm and the thickness T of 1.2 to 1.8 mm as described above. It is important to do.

In this second embodiment, bit 1B is
(1) A bit formed by extending a leg piece 3B from a surface formed by a flat bit body 2B provided with a through hole 5B;
(2) The bit is formed of aluminum with a leg height and the leg piece has a width W and a thickness T, and the width W is 4 to 6 mm and the thickness T is 1.2. Point formed as ~ 1.8mm;
(3) The point that the bit tip is melted by arc discharge and can be welded to the sheet metal surface;
Is the same as in the first embodiment,
(4) The aluminum panel correcting bit 1B includes a screw part 4 formed by twisting a base end part of the leg piece 3B, and the leg piece in the same direction as the penetration direction of the through hole 5B. A point where the width direction of 3B is positioned and the tip of the leg piece 3B is a welded portion;
Is different from the first embodiment.

Next, a suitable example in which the aluminum panel correction-dedicated bits 1A and 1B according to the present invention can sufficiently exhibit their capabilities will be described with reference to FIGS. 1 to 4 and FIGS.

First, as shown in FIG. 2, a plurality of bits 1A are welded to an aluminum outer plate 9 of an automobile body, and even if one bit 1A is welded slightly obliquely, it is raised by a finger to finely adjust the welded state of the plurality of bits. (It is easy to shift from the state of FIG. 2A to the state of FIG. 2B).

FIG. 3 shows that it is easy to perform the sheet metal work by welding the bit 1A to the corner of the corner pillar of the quarter panel of the automobile body formed of the aluminum plate of the automobile body.

FIG. 4 shows that the leg piece of the bit 1A is formed at a leg height and can be used repeatedly by cutting the bit tip.

FIG. 7 shows that the sheet metal surface is pulled up by inserting the push rod 7 into the through hole 5B of the bit 1B and hooking one end hook of the attachment 8 of the sheet metal puller.

FIG. 8 shows that the bit 1B can be welded only to the lower part of the scratch on the sheet metal surface 9 only.

FIG. 9 shows that the bit 1B can be repaired by fusing both sides of the groove with the sheet metal surface 9 welded to the lower part of the groove and pulling the sheet metal surface.

1, 6, 10, and 11, the width L in the short direction of the through holes 5 </ b> A and 5 </ b> B of the bits 1 </ b> A and 1 </ b> B is considerably larger than the diameter of the cross section of the push rod 7 and the push rod 7 can be easily inserted. Indicates.

FIGS. 12 to 14 show that the bit 1B is welded linearly on the line of the sheet metal surface 9 and can be repaired by hitting the root of the welded portion with the line on the sheet metal surface being pulled. Since the bit 1B can be welded linearly in the same direction as the line, the bit does not get in the way in the hammering operation of the bit base portion, and correction is easy.

FIG. 15 shows that two lines can be drawn simultaneously when the two lines on the sheet metal surface to be repaired are far away.

FIG. 16 shows that two lines can be drawn simultaneously when the two lines on the sheet metal surface to be repaired are close to each other.

FIG. 17 shows that it is possible to draw out two sides (a corner portion and a corner portion) of a curved line of the sheet metal surface to be repaired.

Here, a bit welding gun 10 suitable for welding the aluminum panel correction dedicated bit 1 (here, the bit 1A of the first embodiment) according to the present invention will be described with reference to FIGS.

The bit welding gun 10 pulls up and discharges the bit in the bit welding process to melt the bit tip and the sheet metal surface, and returns the bit to the sheet metal surface for welding. The bit guide return mechanism supports the upper and lower sides of the bit with a bit guide so that the welding position between the bit and the sheet metal surface does not change, so that the bit is welded reliably and stably.

The bit welding gun 10 includes a housing 11, a bit holder 20, a bit guide 30, a hollow shaft 40, a set collar 50, a slide core 60, a bit guide return mechanism 70, a slide guide 80, and a coil. A spring 90, a trigger switch 100, a converter 120, a bit lifting interval adjustment knob 170, and a spring pressure adjustment knob 190 are provided.

Among these, the housing 11 includes housing bodies 12A and 12B, grips 13 and 14, hollow cylindrical portions 15 and 16, a trigger switch housing portion 17, a body set screw 18, and a body set nut 19. These structural members are assembled and formed (see FIG. 19).

The bit holder 20 includes a holder main body 21, a holder shaft 22, a holder cover 23, bit holding spring pieces 24A and 24B, and set screws 25A and 25B, and is formed by assembling these constituent members. A bit insertion slot 26 is formed in the bit holder 20, and the bit 1A inserted from the bit insertion slot 26 is held. The bit holder 20 includes a first gas supply path 27 and a second gas supply path 28 that supply the inert gas to be supplied from both side surfaces of the bit toward the tip of the bit. The tip of the holder shaft 22 is inserted into the large diameter portion 42 of the hollow shaft 40 and fixed with a set screw 45. It is preferable that the injection gas injected from the first gas supply path 27 and the second supply path 28 is uniformly injected into the bit.

The bit guide 30 includes a pair of bit guide pieces 31 and 32 disposed on both sides of the bit holder 20 and rubber receivers 33 and 34 provided at the tips of the bit guide pieces 31 and 32.

The hollow shaft 40 includes a small diameter portion 41, a large diameter portion 42, a gas supply path 43 formed by the hollow portion, a screw hole 44 formed in the large diameter portion 42, and a screw engagement with the screw hole 44. And a set screw 45 for fixing the holder shaft 22, a gas inlet 46A and a gas outlet 46B. The proximal end side of the hollow shaft 40 is accommodated in the housing 11, the gas inlet 46 </ b> A is formed on the proximal end side of the hollow shaft, and the gas outlet 46 </ b> B is formed on the distal end side of the hollow shaft. The bit holder 20 is formed on the tip side of the hollow shaft 40, and the gas supply path 43, the first gas supply path 27, and the second gas supply path 28 are connected to the hollow shaft 40 and the bit. It is formed in communication with the holder 20. Thus, gas is guided to the bit holder 20 from the gas outlet 46B. The hollow shaft 40 moves in the housing in conjunction with the converter 120. Reference numeral 47 is a screw for connecting a hollow shaft, 48 is a gas hose, and 49 is a gas hose nipple disposed at the gas inlet 46A.

The set collar 50 includes a color main body 51, a penetrating portion 52, and a set collar fixing screw 53. The set collar 50 is set by being fixed to the outer peripheral wall of the distal end portion of the hollow cylindrical portions 15 and 16 of the housing by the screw 53, and the movement of the slide core 60 and the slide guide 80 toward the bit holder is performed. A restricting stopper is formed.

The slide core 60 includes a core body 61, a penetrating portion 62, insertion holes 63 and 64 through which the base end portion of the bit guide 30 is inserted, and notches 65 and 66 communicating with the insertion holes 63 and 64, A screw hole 67, positioning means 68 for positioning the relative position of the bit held by the bit holder 20 and the tip of the bit guide, and a slide stopper plate 69 are provided. The slide core 60 rotatably supports the bit guide 30, and movement in the bit holder direction is restricted by the set collar 50. The positioning means 68 is formed by a slide set screw that is screwed into the screw hole 67.

The bit guide return mechanism 70 is disposed in the notches 65 and 66 of the slide core 60 and allows the bit guide 30 to be pushed in the direction of the housing. Push back to. For this reason, the bit guide return mechanism 70 includes E-rings 71 and 72 locked in locking grooves formed on the base end side of the guide pieces 31 and 32, and the E-rings 71 and 72 and the insertion The return springs 73 and 74 are interposed between the downward facing step portions formed on the top surfaces of the inner walls of the holes 63 and 64, and the return springs 73 and 74 are formed at the base end portions of the guide pieces 31 and 32. The guide pieces 31 and 32 are urged by winding.

The slide guide 80 is inserted into the hollow cylindrical portions 15 and 16 formed to extend from the housing 11 and guides the slide of the slide core 60.

The coil spring 90 is wound around the slide guide 80, and is positioned between the end walls of the hollow cylindrical portions 15 and 16 of the housing 11 and the top surface of the slide core 60, and the slide core 60 is set in the set collar direction. Energize to.

The trigger switch 100 opens and closes a welding current supplied from a stud welder to a bit held in the bit holder. Reference numeral 105 denotes a switch code.

The converter 120 is operated when a welding current is supplied to the bit 1A held by the bit holder 20 by operating the trigger switch 100, and moves the bit holder 20 in the pull-in direction. The converter 120 includes a solenoid coil portion 121, a solenoid fixing portion 131, solenoid fixing nuts 141 and 142, a solenoid retracting portion 151 formed of a magnetic material, and solenoid connecting screws 161 and 162. . The solenoid coil part 121 is formed with projecting pieces 122 and 123 and a through part 124 and is provided with a solenoid cord 125. The renoid fixing portion 131 is formed with insertion holes 132 and 133 and a female screw portion 134. The solenoid retracting portion 151 includes projecting pieces 152 and 153.

The bit pull-up interval adjustment knob 170 adjusts the pull-up interval of the bit held by the bit holder 20 by moving the bit holder 20 up and down.

The spring 180 is accommodated in a recess formed in the bit pulling interval adjusting knob 170, and when the pulling by the converter 120 is released, the converter 120 is pressed and the position of the bit holder 20 is changed to the converter 121. Push back to the position before retracting.

The spring pressure adjusting knob 190 is screwed with the bit pulling interval adjusting knob 170 and adjusts the spring pressure of the spring 180 according to the depth of the screwing.

Reference numeral 110 is an output terminal, 115 is an output cord, 200 is a welding machine, 230 is a power cord, 250 is ground, 300 is a gas cylinder containing an inert gas, and 301 is a gas pressure regulator.

The welding machine 200 includes an input switching unit 201, an inverter 202, a final output transformer 203, an operation panel 204, a gas opening / closing unit 205, and a signal control unit 206.

The input switching means 201 switches the input voltage by a transformer tap and enables use at 200 to 240V. The inverter 202 raises the electrical frequency, for example, from 50 Hz to 55 KHz, thereby increasing the welding efficiency. The final output transformer 203 exchanges the final output voltage / current, for example, converts 200V to 20V and outputs it, and ensures the welding of bits made of aluminum. The operation panel 204 includes a welding bit selection column 211, an energization time selection column 212, a contact column 213 that is turned on when the bit comes into contact with the correction plate, a start column 214 that lights up the start of welding when the switch 100 is operated, Power field 215 that is lit when the flow is flowing, Adjust field 216 that is lit when the bit holder is being lifted, a set energizing time and a time for lifting the bit holder, and a set value that indicates the material and thickness of the selected welding bit Each display field includes a display field 217, a Memory 218 for storing the setting value of the final work before the main switch is turned off, and an Adjust Time field 219 for selecting a pull-up time. The gas opening / closing means 205 opens and closes an inert gas (for example, argon gas) in the gas cylinder. The signal control means 206 controls the output voltage / current and output time timing, etc., outputs a trigger signal to the inverter 202, and outputs a gas opening / closing signal to the gas opening / closing means 205.

(Operation procedure for welding the bit 1A to the aluminum outer plate 405 of the automobile body)
Here, an operation procedure for welding the bit 1A to the aluminum outer plate 405 of the automobile body using the aluminum bit welding gun 10 will be described with reference to FIGS. 19, 22, 23, 24, 27, and 28. To do.
(1) The aluminum bit welding gun 10 is connected to the welding machine 200 and set in a weldable state.
(2) Insert and set the bit 1A from the bit insertion port 26 of the bit holder 20 [FIG. 28 (a)].
(3) From this set state, the set screw 68 of the slide core 60 is once loosened, and the slide core 60 is moved upward while resisting the guide spring 90, leading to a state in which the bit tip abuts against the aluminum outer plate 450. In this state, the slide fixing screw 68 is tightened [FIG. 27 (a)].
(4) Hold the grips 13 and 14 with one hand, press the spring adjustment knob 190 from above with the other hand, and hold the body of the aluminum bit welding gun so that the tip of the bit makes strong contact with the aluminum outer plate. Push in [FIG. 27 (b)]. In this state, the springs 73 and 74 constituting the bit guide return mechanism 70 are placed in a compressed state.
(5) When the tip of the bit comes into contact with the aluminum outer plate, an inert gas (in this case, argon gas) passes through the two gas supply passages 27 and 28 formed in the bit holder 20 and is evenly injected to both sides of the bit.
(6) Thereafter, when the trigger switch 100 is pressed, the solenoid coil portion 121 constituting the converter 120 is excited, and simultaneously, a welding current flows through the bit 1A.
(7) When the solenoid coil part 121 is excited, the solenoid coil part 121 retracts the lead-in part (electromagnetic valve) 151. Then, the hollow shaft connecting screw 47 with which the flange portion 47A is in contact with the drawing portion 151 also moves (withdrawn) together with the drawing portion 151, and the screw portion of the hollow shaft connecting screw 47 is the short diameter portion of the hollow shaft 40. Since it is screwed to 41, the hollow shaft 40 is also lifted. Since the holder shaft 22 is fixed to the large-diameter portion 42 of the hollow shaft 40 with a set screw 45, the bit 1A set in the bit holder 20 is pulled upward together with the bit holder 20 (raised about 1 mm) [Fig. 27 (c)], an arc is generated between the bit tip and the aluminum outer plate 405 [FIG. 28 (b)], and the oxide film on the aluminum outer plate 405 is removed.
(8) Thereafter, when the capacitor capacity of the welding machine 200 is exhausted, the retracting of the retracting portion 151 by the solenoid coil portion 121 is released, and the bit holder 20 is pushed back toward the aluminum outer plate 405 by the spring force of the return spring 180. The bit 1A is melted and welded to the aluminum outer plate 405 [FIGS. 27 (d) and 28 (c)]. Since the bit guide return mechanism 70 is set on both the left and right sides of the slide core, a return spring 73, which further constitutes the bit guide return mechanism 70 with the bit leading end in contact with the sheet metal surface before the bit welding. 74, because the bit 1A is pushed into the sheet metal side by the amount that is shortened even if the bit 1A melts and becomes shorter during discharge by pushing the bit tip against the sheet metal side against 74, the welding position of the bit and the sheet metal surface The bit can be welded reliably without changing.

1A Aluminum panel correction bit 1B Aluminum panel correction bit 1C Repair piece 2A Bit body 2B Bit body 3A Leg piece 3B Leg piece 4 Screw part 5A Through hole 5B Through hole 7 Push rod 8 Sheet metal puller attachment 9 Sheet metal surface 10 Bit welding Gun 11 Housing 12A Hiding body 12B Housing body 13 Grip 14 Grip 15 Hollow cylindrical portion 16 Hollow cylindrical portion 17 Switch receiving recess 18 Body set screw 19 Body set nut 20 Bit holder 21 Holder body 22 Holder shaft 23 Holder cover 24A Bit Presser spring piece 24B Bit holder spring piece 25A Cover set screw 25B Cover set screw 26 Bit insertion port 27 First gas supply path 28 First gas supply path 30 Bit guide 31 Guide piece 32 Guide piece 33 Rubber 34 Rubber receiver 40 Hollow shaft 41 Small diameter portion 42 Large diameter portion 43 Gas supply path 44 Screw hole 45 Set screw 46A Gas inlet 46B Gas outlet 47 Hollow shaft connection screw 48 Gas hose 49 Gas hose nipple 50 Set collar 51 Color body 52 Through portion 53 Set collar fixing screw 60 Slide core 61 Core body 62 Through hole 63 Insertion hole 64 Insertion hole 65 Notch 66 Notch 67 Screw hole 68 Positioning means 69 Slide stopper plate 70 Bit guide return mechanism 71 E ring 72 E Ring 73 Return spring 74 Return spring 80 Slide guide 90 Slide guide spring 100 Trigger switch 105 Switch cord 110 Power supply output terminal 115 Output cord 120 Transducer 121 Solenoid coil section 122 Projection piece 123 Projection piece 124 Through part 125 Solenoid cord 131 Solenoid fixing part 132 Insertion hole 133 Insertion hole 134 Through part 141 Solenoid fixing nut 142 Solenoid fixing nut 151 Solenoid retracting part 152 Protruding piece 153 Protruding piece 161 Solenoid connecting screw 162 Solenoid connecting screw 170 Bit Pull-up interval adjustment knob 180 Solenoid return spring 190 Spring pressure adjustment knob 230 Power cord 250 Ground 300 Inert gas storage cylinder 301 Gas pressure regulator

Claims (4)

A bit formed by extending a leg piece from a surface formed by a flat metal fitting body provided with a through hole, the bit being formed at a leg height with aluminum, the leg piece having a width W and a thickness T The aluminum panel modification is characterized in that the width W is 4 to 6 mm and the thickness T is 1.2 to 1.8 mm, and the tip of the bit is melted by arc discharge so that it can be welded to the sheet metal surface. Dedicated bit. A screw portion formed by twisting the base end portion of the leg piece; the width direction of the leg piece is positioned in the same direction as the penetrating direction of the through hole; and the tip end of the leg piece is a welded portion The aluminum panel correction-dedicated bit according to claim 1, characterized in that it is formed as described above. 3. The aluminum panel correction-dedicated bit according to claim 1, wherein the bit is formed so that it can be used repeatedly by cutting a bit tip after the bit is welded. 4. The bit is formed such that the welding direction of the bit to be erected can be adjusted by raising the welding direction of the leg piece with a finger using the welded portion of the leg piece as a fulcrum and finely adjusting the angle. The aluminum panel correction-dedicated bit according to any one of claims 1 to 3.

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