JPS58192677A - Working device of metal - Google Patents

Abstract

PURPOSE:To remove a metallic plate quickly from a weld zone without requiring labor and skill, by disposing a hollow electrode rod vertically to the welded part of the metallic plate, generating an arc to melt the circumference of the welded part and sucking the molten metal. CONSTITUTION:When the tip of an electrode rod 5 is pressed to a metallic plate 1 to be worked and compressed air is fed into a cylinder 31, a sliding block 24 retreats a rod 12 and the rod 5 parts from a metallic plate 6, thereby generating an arc between both. When the cylinders 30, 31 are released here, the block 24 starts advance while restraining the rod 12. On the other hand, a suction device is operated to suck the molten part of the plate 1 through the rod 5. The partially welded metallic plate is easily removed by the above-mentioned device, and since the molten metal is sucked away, no spark is generated and the spoiling of the working environment is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal processing device, and more specifically, the present invention relates to a metal processing device, and more specifically, a metal processing device that processes metal partially welded to a metal member by melting Ir.
This device relates to a device for removing a metal member by bisecting it around the periphery of the metal member.

When repairing automotive sheet metal, it is necessary to remove sheet metal that has been spot welded in many areas. To remove this fΦ spot welded metal plate, press a drill vertically against the welded part of the metal plate, press down the drill while rotating it with a motor, and drill down at an appropriate position. was the most common. With this method, it is necessary to drill a center hole or perform centering without slicing. Since the hardness of the welded part increases due to the heat effect during welding, it requires a considerable amount of force to press with a drill, often damaging the lower plate, and requiring time and skill. Furthermore, the blades were worn out rapidly, leading to high costs.

The present invention solves the above-mentioned inconveniences and provides a device that can be removed from a welded part in a short time without requiring much labor or skill on the part of the operator.

That is, in the present invention, a hollow carbon electrode rod is arranged perpendicularly to the metal plate so as to face the periphery of the welded part of the metal plate,
An arc is generated between an electrode rod and a metal plate, and the arc heat melts the area around the welded part of the metal plate, and the molten metal is sucked into the hollow part of the electrode rod as a suction passage. It is.

The device of the present invention includes a hollow rod having an electrode holding part for holding a hollow electrode at its tip, a rod holding mechanism for holding the 07-do so as to be movable back and forth, and urging the rod forward. a sliding block that is biased forward to a fixed position by the elastic body and is movable back and forth; a mechanism for retracting the sliding block with respect to the rod; and a mechanism for retracting the sliding block with respect to the rod; a mechanism for engaging the sliding block with the rod and retracting the sliding block with the rod;
The device includes a mechanism for releasing the engagement of the sliding block with the rod, a suction device that generates a suction force in the hollow portion of the rod, and a conductor that conducts current to the electrode rod via the rod. be.

According to the present invention, the area around the welded part of the metal plate is melted by arc heat, and the molten metal is quickly sucked and removed through the electrode rod that also serves as a suction nozzle, so that the metal plate is welded in a very short time. It is separated from the metal member.

Therefore, the operator does not need to use as much force as in the conventional method using a drill, and the working time is very short.

Further, by adjusting the position of the sliding block relative to the rod, the melting depth of the metal plate can be automatically controlled, so that no skill is required and the lower plate is not damaged. Also, since the molten metal is removed through the electrodes, there are no sparks flying around and no nuisance to the working environment.

The present invention will be explained below using examples.

1 is a metal plate spot-welded to a metal plate 3 by a portion 2; Reference numeral 4 denotes a torch for cutting the metal plate 1 from the metal plate 3 near the welded portion 2. The torch 4 holds a hollow carbon electrode rod 6 at its tip and has an electric conductor 6 for passing current through the electrode rod 6, and the electric conductor 6 is connected to a stop rod of a power supply device 7. On the other hand, the processed metal is connected to the negative terminal of the power supply. The torch 4 is further connected to a control device 8,
A near compressor 9 is connected to the control device.

2 and 3 show the structure of the torch 4. FIG. Reference numeral 10 denotes a case made of synthetic resin, which has an abbreviated shape, and a rear bent portion 11 serves as a handle portion. Reference numeral 12 designates a hollow movable rod that combines hollow members 12a and 12b, and is capable of sliding back and forth on a bearing 13 provided at the front of the case 10 and a bearing 15 provided on a base 14 fixed at the rear of the case. It is installed. The tip of the rod 12 has a chuck 16 for holding the hollow carbon electrode rod 6 on the rod 12.

1 is a guide for pressing the electrode rod 5 perpendicularly to the metal to be processed, and two pins 18 provided at the rear are inserted into the through holes in the front of the case and fixed with screws 19. rod 12
A conductor 6 for passing current to the electrode rod 5 is inserted into the case through a through hole 20 provided on the side surface of the case 1o, and is coupled to the member 12a of the rod 12 by a screw 21.

The conductor 6 is connected to a coaxial cable 22 through which current and compressed air are passed, and a passage 23 through which compressed air is passed is communicated with the hollow part of the rod 12 through a through hole on the rod side. The conductor 6 moves with the trench rod 12, but the through hole 20
The rod 12 can only move within a range of 1 to 3, and also has the role of limiting the amount of movement of the rod 12 in the front and back direction.

At the front part of the 24-piece base 14, it is a sliding block that fits around the outer periphery of the rod 12, and a protrusion 25 provided on the rear upper surface of the sliding block fits into a through hole 27 of a regulation plate 26 fixed to the base 14. Although the protrusion 25 can move back and forth within the movable range within the through hole 27, it is normally urged forward by a spring 28 inserted between the sliding block and the base 14.

A spring 29 inserted between the partition wall of the case and the conductor 6 urges the rod 12 forward.

On the left and right sides of the base 14 are cylinders 30 for engaging the sliding block 24 with the rod 12 and moving the rod 12;
It has a slider 31 for adjusting the position of the sliding block 24 with respect to the rod 12.

The operations of the 7 cylinder 3o and the sliding pro 7 slider 24 will be explained with reference to FIGS. 4 to 6. Piston 32 attached to cylinder 3o
One end' of a link 34 is pivotally supported by a shaft 33 at the end thereof, and the other end of the link 34 is eccentrically supported by the sliding block 24 by a shaft 36. A lock pin 36 is inserted into the block 24, and has a V-shaped groove 37 at its tip that fits into the outer periphery of the rod 12.

The link 34 is normally located at the position indicated by the chain line in FIG. Not yet. Therefore, the rod 12 is in a state where it can freely move back and forth. However, when compressed air is sent into the air chamber 30a of the cylinder 30, the piston 32 moves in the same right direction, the link 34 moves as shown by the solid line in FIG. 4, and the end of the link 34 on the shaft 36 side is locked. pin 36
Press the bottom surface of the As a result, the bottle 36 moves forward and presses the rod 1'2 with the groove 37 at its tip, so that the sliding block 24 and the rod 12 are integrated via the bottle 36 j2. If the piston 32 further moves to the right, the sliding block 24 and rod 12 will move to the right by the amount that the piston 32 has moved. Note that this movement rate is limited to the range in which the protrusion 26 of the sliding block 24 described above can move within the through hole 27 of the regulating plate 26.

Next, when the supply of compressed air to the air chamber 30a of the cylinder is cut off, the force of restraining the rod 12 by the bottle 36 is maintained.
, the sliding block 24 is moved by the forces of the springs 28 and 29.
moves forward. If compressed air is still sent into the air chamber 30b of the cylinder, the locking process operates in the reverse order,
The link 34 returns to the original position indicated by the chain line and is unlocked.

Next, the operation of the sliding block 24 and cylinder 31 will be explained with reference to FIG.

A connecting fitting 39 is fixed to the end of the piston 38 attached to the cylinder 31 by screw fitting.

A bottle 4o is provided on this metal fitting 39 so as to protrude rearward, and a long hole 41 provided in the sliding block 24 is provided.
A bottle 42 that fits into the block protrudes toward the block 24. Since the block 24 is urged forward by the spring 28, it engages with the rear edge of the elongated hole 41.

On the other hand, an adjustment jig 43 is attached to the base 14 by a shaft 44 facing the bin 4o of the metal ring 39, and is connected to an adjustment handle 46 protruding from the outside of the case. The adjustment jig 43 can be rotated by operating the handle 46, and the gap d between its peripheral surface and the bottle 4o can be adjusted in stages. A ball 46 for preventing rotation is pressed against the side surface of the adjustment jig 43 by a spring 47.

When compressed air is sent into the air chamber 31a of the cylinder 31, the piston 38 moves to the right, and thereby the connecting fitting 39
moves the sliding block 24 to the right by the bin 42 until the bin 41 hits the adjustment jig 43. The operation at this time has nothing to do with the locking operation by the cylinder 3°. That is, the cylinder 31 serves to move the sliding block 24 backward by the gap d, regardless of the rod 12 and the cylinder 3o.

Next, FIGS. 2 and 3 will be further explained. A suction device 48 is airtightly coupled to the rear of the base 14. The exhaust passage 48a of this suction device communicates with the hollow part of the rod 12, and compressed air from the conduit 60 is injected at high speed through several orifices 49 provided in the side 9 part toward the υtokesen. , 11 pressure is generated on the rod 12 side, and the molten portion of the punched metal, which will be described later, is sucked using the carbon electric orange rod 6 as a suction nozzle.

In addition to the conduit 6o connected to the suction device 48, the handle 11 has two pipes connected to the air chambers 30a and 30b of the cylinder 30.
Book Conduit 51. / Reed connector 6 connected to the conduit 52 connected to the air chamber 31a of the IJ engine 31 and the operation switch 63
4 has been inserted.

This is a support for 65 coaxial cables 22.

Next, the operation of this device will be explained with reference to FIG.

A hollow carbon electric camellia rod 6 is attached to the tip of the rod 12 by a chuck 16 without being twisted. In this state, sliding block 2
Since the rod 12 is urged forward by the spring 29, the tip of the electrode rod 6 protrudes from the end of the guide 17.

Next, hold the handle 11 in your hand and press the tip of the electrode rod 6 vertically against the metal plate 1 to be processed, so that the tip of the electrode rod 5 is aligned with the tip of the guide 17 (FIG. 7a).

Then, when compressed air is sent into the air chamber 31a of the cylinder 31, the sliding block 24 is moved back by the distance d as described above. In this case, due to the biasing force of the spring 28, the protrusion 25 of the sliding block 24 has retreated by a distance d from the state in which it was in contact with the front edge of the through hole 27 of the regulating plate 26. Next, turn on the power switch. In this state, there is a smoke path with the metal plate 1 with six electrode rods.

When compressed air is sent into the air chamber 30a of the cylinder 30 in this state, the sliding block 24 moves the rod 12 backward.

As a result, the electrode rod 6 separates from the metal plate 6, and an arc is generated between the two (FIG. 7b).

Now, when the cylinder 30.31 is released, the sliding block 24 becomes free with respect to the cylinder 30.31, but
Since the restraining force by the lock bin 36 is not released, the sliding block 24 is moved by the IT spring 2 that restrained the rod 12.
8. Start moving forward with the urging force of 29 (Fig. 7 C)
.

On the other hand, the suction device 48 is operated to suction the melted portion of the metal plate 1 using the electrode rod 6 as a suction nozzle.

The rod 12 is restrained by the sliding block 24 and moves forward by one stroke, but the amount of movement is such that the protrusion 26 of the sliding block 24 hits the front edge of the through hole 27 of the regulating plate 26, that is, the surface of the metal plate 10 The tip of the electrode rod 6 protrudes by a distance d. In other words, d is equivalent to the thickness of the metal plate 1,
When the area around the melt 7i''j part 2 of the metal plate 1 is melted, the electrode rod 5
contacts the lower metal plate 3, and melting does not proceed any further (Fig. 7d).

After that, the power is turned off, and the series of operations from the air chamber 30b of the cylinder 30 onwards are automatically performed by the control 44: position 8 by pressing the switch 63 with the electrode rod 5 pressed against the blanked metal. It will be done. In addition, the cylinder is activated and released by operating the solenoid valve manually. It's a trench, coaxial cable 22.
By appropriately supplying compressed air from the rod 12, deposits in the hollow portion of the rod 12 can be removed.

Next, to explain a specific example, the inner diameter is 6.0ran, the outer diameter is 9.0ran.
Using a carbon type rod with a copper plating layer on the outer surface and a DC drooping characteristic as an external power source, the spot weld of two mild steel plates with a thickness of 0.8 mm was melted at 6 rMl. When carried out, the work was completed in about 1 second with a current of 300A and a voltage of 30V.

In this case, by passing compressed air of 6 to 7 K9/h through the suction device, a negative pressure of about 2000 wnAq was generated, and the molten metal could be almost completely removed.

As described above, according to the present invention, a metal plate partially welded by spot welding or the like can be easily removed. Still, the molten metal is removed by suction, so
No sparks are generated and the work environment is not affected.

[Brief explanation of drawings]

Figure 1 is a diagram of the plot during processing using the device of the present invention, and Figure 2 is
The figure is a plan view with the main parts cut out, Figure 3 is a longitudinal sectional view, Figure 4 is a sectional view showing the relationship between the sliding block and the rod, and Figure 6 is a cross section taken along line v-v' in Figure 4. 6 is a cross-sectional top view of the main part showing the operation of the sliding block, and FIG. 7 is a diagram showing the metal processing process. 1... Corrugated metal, 6... Electric, frame bar,
6...Conductor city body, 7...Power supply, 8...
...Control device, 10e0@...Case, 12 ・0・
・Fist Lot 1.13, 15・00. fist 0. bearing,
24------Sliding block, 26ee... ■Regulation plate, 28, 29... Spring, 30° 31...
・Ro... Cylinder, 32.38 @-@- Piston, 3
4-----・-Link, 36-----・Rock Bi/,
39... Connecting metal fittings, 40... Bin, 4
3... Adjustment jig, 48... Suction device. Name of agent: Patent attorney Toshio Nakao and 1 other person-4
F+9- Figure 6 Figure 7 23! 11 Dear Commissioner of the License Agency, 1' = JG i' 1 Indication of Patent Application No. 74918 of 1988 2 Name of the invention Metal weighting device 3 Modification old. With Shijada...:;''1. (141″) 1006, Oaza Bar, Kadoma City, Jinshanfu, Kadoma City, Scattered Place Names: 4′+: (582) Matsushita Electric Industrial Co., Ltd. 1. and 111 Shun Shimo
Hiko 4 Agent Tsuta 571 Address 6, Matsushita Electric Industrial Co., Ltd., 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Contents of Amendment (1) The scope of claims column of the specification will be corrected as shown in the attached sheet. ( 2) The description from page 3, line 6 to page 4, line 10 of the specification will be corrected as follows: ``The device of the present invention is equipped with an electrode holding part that holds a hollow electrode at its tip. a hollow rod, a rod holding mechanism that holds the rod so that it can move back and forth, and an elastic body that biases the rod forward. a sliding block; a guide piece for determining the reference position of the tip of the electrode rod by bringing its tip into contact with the broken egg 1i group; a mechanism for engaging the sliding block with the rod and causing it to retreat together with the rod; This device includes a mechanism for releasing the engagement relationship between the block and the rod, a suction device that generates suction force in the hollow portion of the rod, and a conductor that conducts current to the electrode rod via the rod. The device of the invention presses the electrode rod against the surface of the workpiece metal using the guide piece as a reference, applies a voltage between the electrode rod and the broken lJ mouth metal, engages the sliding block with the rod, and retreats. By sequentially moving the mechanism for disengaging the sliding block from the rod, the mechanism for releasing the engagement of the sliding block with the rod, and the suction device, it is possible to apply T to the metal under certain conditions. By adding a device that adjusts the distance between the electrode rod and the pressurized metal when an arc occurs, it is possible to adjust the distance between the electrode rod and the pressurized metal and change the arc conditions depending on the metal to be processed. Electrode rod consumption can also be accommodated by χ. (3) Change "Pino 41" in the 9th line (1st line 13) to "P/40".
” I am corrected. (4) “Bearing” and “24
Insert "17...Guide," between 1 and 1. 2. A hollow rod with an electrode holding part that holds a hollow electrode at the tip of the '4''J' + ¥r.?J range, and a rod holding mechanism that holds the rod so that it can move back and forth. an elastic body that biases the rod forward; a mechanism that engages the rod with a sliding block that can be moved forward and backward and is biased forward with both hands by the elastic body, and causes the rod to retreat together with the rod; T on the rod of the sliding block
a mechanism for releasing the engagement relationship, a suction device that generates a suction force in the hollow part of the rod, and a conductor that spreads a current to the electrode rod through the rod (4iii). υn 'T2 * 0

Claims (1)

[Claims] A hollow rod having an electrode holding portion that holds a hollow electrode at its tip, a rod holding mechanism that holds the rod so as to be movable back and forth, an elastic body that urges the rod forward, and an elastic body. a sliding block that can freely move back and forth and is biased forward to a fixed position by a sliding block; a mechanism for retracting the sliding block with respect to the rod; a device for adjusting the amount of retraction of the sliding block; a mechanism for engaging the block with the rod and moving the block back together with the rod; a mechanism for releasing the engagement relationship of the sliding block with the rod; a suction device for generating suction force in the hollow portion of the rod; A metal processing device comprising a conductor through which current is passed to an electrode rod.