JPS6012278A - Cutting method of painted plate - Google Patents

Abstract

PURPOSE:To provide two functions of removing a paint coated film and cutting a painted plate by removing the paint coated film and primer coat of the painted plate with the pilot arc of a plasma cutting machine then cutting the painted plated with the main arc. CONSTITUTION:After a torch PT is approached to a painted plate BD, a contactor CT is opened to put the power source device PG of a plasma cutting machine into an operating condition. A pilot arc is generated from the nozzle of the torch PT to the plate BD to remove the paint coated film and primer coat from the surface of the plate BD. The contactor CT is then closed and the device PG is operated to emit the main arc from the torch PT, thereby cutting the part of the plate BD where the paint coated film and primer coat are removed. Two functions of removing the paint coated film and cutting the plate are thus provided with one kind of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for cutting painted products with coatings and bases.

[Background of the invention]

Conventional equipment for cutting coated products with a paint film and a base material first removes the paint film manually using a grinder, or by spraying a jet of water or sand, and then removes the paint film. The method used was to cut it off. For this reason, a force is applied to the coated product having the coating film and the base material, i.e., the base material, and the base material is fixed, and the coating removal device part of the coated plate cutting device must also be fixed in a manner that can withstand the reaction force. was there.

Furthermore, the method of spraying water or sand has the disadvantage that it requires a large and bulky device for collecting and reusing the water or sand. Furthermore, since the paint film removal device and the cutting device are separate devices, the entire device is large and it is necessary to separate the paint film removal and cutting operations.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an easy-to-operate and efficient method for cutting a painted board, which eliminates the drawbacks of the conventional method and allows immediate cutting after removing the paint film and base of the painted product.

[Summary of the invention]

In the present invention, the main arc current of the plasma cutting machine is released and the coating film and base are removed using only the pilot arc, and then the main arc current of the plasma cutting machine is applied to cut the coated plate. .

[Embodiments of the invention]

FIG. 1 is a system configuration diagram showing the configuration of a painted plate cutting device according to an embodiment of the present invention.

The plasma cutting machine power supply device PG generates high frequency waves using the power of the power supply PWs, and fires a plasma jet from the nozzle tip of the plasma torch PT toward the base material BD. The flow rate of gases such as argon and nitrogen in the gas cylinder GB is adjusted by the plasma cutter power supply PG and sent to the plasma torch PT. The water supply device WP is a water supply and drainage device for cooling the Plasma Arch PT and L Zoo, and the plasma torch PT-69 whose flow rate is adjusted by the plasma cutting machine power supply device PG.
-7L- The cooling water is supplied with water, and the cooling water is returned to the water supply device WP and drained. The contactor CT opens the main arc for plasma cutting flowing between the plasma torch PT of the plasma cutting machine power supply device PG and the base material BD, and the contact part is turned on and off by the switch SW. When the switch SW is turned on, the operating coil of the contactor CT is excited by the power supply PW2, and the contact part of the contactor CT is closed to be in the closed state. Arc from torch to base material BD
Then the base material BD is cut. When the switch SW is opened, the operating coil of the contactor CT is demagnetized and the contact part of the contactor CT is opened to maintain an open state.The plasma torch PT is brought close to the base metal BD and a pilot arc is emitted from the nozzle of the mohrasma torch PT. is fired, but the main arc for cutting the base metal BD does not fly. Therefore, plasma)
- When the plasma cutting machine power supply unit PG is operated with the torch PT close to the base material BD and the contactor cT in an open state, a plasma arc of only a pilot arc flies from the nozzle of the plasma torch PT to the base material BD, and the plasma arc reaches the base material BD. The coating on the surface and the base material such as putty can be removed by heating. In the figure, the power source PW1 of the plasma cutting machine power supply device PG and the power source PWz of the contactor CT are shown as separate power sources, but they may be the same power source. In addition, the contactor CT can also be a non-contact type using semiconductors such as thyristors and transistors instead of a contact type, and if it is housed in the plasma cutting machine power supply PG, the entire device can be made smaller. I can do it.

FIG. 2 is a system configuration diagram showing the configuration of a painted plate cutting device showing another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same products and have the same functions.

The figure shows the removal and cutting of the paint film on the car side outer panel of a railway vehicle using the painted panel cutting device of the present invention. In this case, the outer panel of the vehicle becomes the base material BD. Plasma torch PT is brought close to the outer panel of the vehicle, which is the base material BD, and the contactor C is
When the plasma cutting machine power supply unit PG is operated with the T open circuit, a plasma pilot arc is emitted from the nozzle of the plasma torch PT, and the base material such as the paint film and putty on the vehicle's outer panel is heated and burnt, causing damage from the outer panel surface. removed.

Next, the contactor CT is closed and the plasma cutting machine power supply unit PG is operated to cut the area where the base material such as the paint film and putty on the vehicle outer panel has been removed by firing the main arc from the CH PT. do. Robot Pl: The operation is controlled by the program of the robot controller RC. After removing the paint film on the vehicle's outer skin along the cutting line CL by the plasma pilot arc fired from the nozzle of the plasma torch PT attached to the tip of the robot PR's arm, the main plasma arc removes the paint film again. The outer panel of the vehicle is cut along the cutting line CL. The gas cylinder QB is a cylinder for gases such as argon and nitrogen, and the flow rate is adjusted by the plasma cutter power supply PG to power the plasma torch PT.
supplied to Good results can be obtained by using argon gas when removing the coating and using a mixed gas of argon and nitrogen when cutting. Carriage CA- is a mobile cart with wheels, robots) PR, robot control devices R and C, plasma cutting machine power supply device PG,
Plasma torch PT1 gas cylinder GB and water supply device W
The entire device such as P (not shown) is loaded and moved.

Electric power is supplied to the trolley OA and the entire painted plate cutting device using a cord with an outlet or running wheels. Furthermore, a motorized power generator may be installed on the trolley CA without relying on an external power source.

3 to 6 show the sequence of movement of a plasma torch for coating removal and cutting in accordance with an embodiment of the present invention.

That is, it represents the locus of the nozzle tip when removing and cutting the coating film on the base material BD while emitting a plasma arc from the nozzle tip of the plasma torch PT. In other words, this is the movement trajectory of the robot PR, and is the human power (teaching) of the operation order data to the robot control device RC.

Figure 3 shows the most basic movement sequence. First,
To remove the paint film, move from point Pi (Xi #'Il) to point Px (X2 + '12), and then move to point P2 (Xz
sy2) to point Pg (Xs + 'Is), and from point Ps (Xll #)'a) to point P4 (X
4 + Y4) and point P4 (X4 s )'4
) to the point P l (Xl * yx ) to remove the paint film, and then for cutting, follow the same trajectory as when removing the paint film, that is, point P1 # P2 s Ps * P4
* Circulate with PI and disconnect. This method is effective for removing and cutting thin strips of paint.

Figure 4 shows an effective method for expanding the range of paint film removal, in which the tip of the plasma torch PT is moved up and down (waving) when moving from point P1 to point P2. . When moving from point P2 to point P3, it is also moved left and right, when moving from point P3 to point P4, it is also moved up and down, and when moving from point P4 to point P1, it is also moved left and right.

When the robot PR is operated with waving applied in this way, the width of the coating film removal can be freely selected according to the width of the waving. The figure shows a case where the waving is operated with a chevron-shaped or sawtooth wave, but it may be a sine wave or a rectangular wave, and the key is to have a width in the cutting direction of the tip of the plasma torch PT. All you have to do is add a waving motion in the direction of the movement. Cut at point Pl# P2h
Do not apply waving to the order of P3#P4*P1 and make linear motion.

FIG. 5 is an improved version of the paint film removal method of the method shown in FIG. 4, which allows the paint film to be removed cleanly even at the corners of points PI, P2, Ps, and P4. Point P
This is a method in which the starting points of the plasma torches PT of i to P4 are shifted in advance by the width of the waving.

Figure 6 shows a method of shifting the center line for paint film removal and the center line for cutting.The reference point for paint film removal is set at PI'(X1's'Is'
)*P2'(X2'+'12' L p3/ CX
S'#ys' L p4/(X4'm'14) This point PI-P4 is shifted to points P1' to P4' by software coordinate transformation of the program of the robot control device C. This method has the advantage that the robot PR can be operated easily. Furthermore, when cutting, it is also possible to apply waving to increase the cutting width.

〔Effect of the invention〕

As described above, according to the present invention, the pilot arc of the plasma cutting machine can easily remove the paint film and the base material such as putty, and the main arc can easily cut the material after the paint film has been removed. be able to. In addition, since the present invention uses a method of emitting a plasma jet, no force is generated that presses the base material, so instead of using a method that does not require fixing the base material, it is possible to use a method that sprays water or sand in a jet shape. This has the great advantage of eliminating the need for large-scale equipment to collect water or sand.

The entire device is simple and compact because it has two functions: coating removal and cutting.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing the configuration of a painted plate cutting device according to an embodiment of the present invention. FIG. 2 is a system configuration diagram showing the configuration of a painted plate cutting device according to another embodiment of the present invention. 3
-FIG. 6 shows the movement sequence of a plasma torch for coating removal and cutting according to an embodiment of the present invention. PG...Plasma cutting machine power supply device, PT...Plasma torch, BD...Base material, CT...Contactor, SW...
...Switch, pw, ...power supply, PW2...power supply,
GB...Gas cylinder, WP...Water supply device, PR...
・Robot, RCt4Δ P4 /'J Miotsu diagram

Claims (1)

[Claims] 1. A method for cutting a coated board, which comprises removing the paint film and base of the coated product using a pilot arc of a plasma cutter, and then cutting the coated product using the main arc of the plasma cutter.