JPH0532200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a water jet, and more particularly to a cutting method thereof.

``Prior art'' Conventionally, liquid is injected onto a workpiece to cut out the workpiece, and the cutout is used as a product, or conversely, a hole is drilled in the workpiece as a product. Processing is being carried out. In this case, the product may be damaged, especially if the cutout member is separated from the workpiece and received by the water jet catcher. Further, even when drilling is performed on a workpiece as a product, the cut-off scraps may damage the product depending on the material and the shape of the cutout.

In order to eliminate such drawbacks, conventional methods have involved jetting liquid from a machining head toward a workpiece and moving the machining head and workpiece relatively to form a continuous cutting line. A joint that cuts a workpiece, stops the cutting just before the cutting line connects to the already cut line, and connects the inner and outer parts surrounded by the cutting line at the cutting stopped part. It is being done to form a section.

"Problem to be Solved by the Invention" However, in the conventional processing method, the joint part was formed by stopping the cutting just before the above-mentioned cutting line was continuous with the already cut cutting line. The joint is formed over the entire thickness of the workpiece, and when the plate is particularly thick or the material is stone or glass, the joint part is broken and the inner and outer parts are separated. It became difficult to separate the parts, and there was a risk that the product would be chipped if the joint part was broken.

"Means for Solving the Problem" In view of such circumstances, the present invention has been developed so that when the cutting line reaches a position on the verge of continuation to an already cut cutting line, the processing head and the workpiece are connected while continuing the cutting process. The cutting line is continuous on the front side of the workpiece, and a joint part connecting the inner part and the outer part is formed on the back side. .

"Operation" According to the above processing method, the cutting line is continuous on the front side of the workpiece, and a joint part connecting the inner part and the outer part can be formed on the back side, so that the plate thickness can be reduced. Even if the joint part is thick, the thickness of the joint part can be made small. Therefore, the joint part can be easily broken and the inner part and the outer part can be separated, and the risk of chipping of the product can be reduced. can be reduced. Even if a chip were to occur in the product, the cutting line is continuous on the front side of the workpiece, so the chip will occur on the back side, and depending on the product, it may not be possible to use it as is. It becomes possible to do so.

"Example" The present invention will be described below with reference to the illustrated example.
In FIG. 1, a movable frame 2 is provided on a fixed frame 1 of a water jet so as to be reciprocatable in the X direction, and a processing head 3 is provided on this movable frame 2 so as to be reciprocatable in the Y direction orthogonal to the X direction.

The processing head 3 is movable up and down with respect to the movable frame 2, and can spray liquid supplied from a supply source (not shown) through a high-pressure pipe 4 toward a workpiece 6 from a nozzle 5 at the bottom. I'm starting to be able to do it. At this time, it is of course possible to mix an abrasive material into the liquid.

The fixed frame 1 is provided with a catch 7 that moves in the X direction together with the movable frame 2 at a position directly below the nozzle 5, and this catch 7 has an opening in the Y direction along the moving direction of the processing head 3. The liquid and abrasive material from the nozzle 5 can be collected.

The workpiece 6 is gripped and fixed by a clamper 8 provided on the fixed frame 1, and the control device 9 controls the X of the movable frame 2.
By controlling the movement in this direction and the movement of the processing head 3 in the Y direction, the processing head 3 and the workpiece 6 are moved relative to each other in the X-Y direction, and the nozzle 5 is injected toward the workpiece 6. The workpiece 6 can be cut into a desired shape using the liquid and the abrasive mixed into the liquid.

In the water jet having the above configuration, when manufacturing a round product 12 by cutting it out, for example, as shown in FIG.
Drilling is performed by injecting liquid at a required position a of the workpiece 6, which is the outside of the workpiece 2. Next, processing head 3
After the product 12 and the workpiece 6 are moved relative to each other and the product 12 is cut to the contour portion b, cutting is continued from there along the contour of the product 12 in a counterclockwise direction in FIG.

When the cutting line 13 reaches a position c on the verge of continuing to the already cut cutting line, the relative movement speed between the processing head 3 and the workpiece 6 is increased while the cutting process continues, thereby increasing the relative movement speed of the processing head 3 and the workpiece 6 as shown in FIG. As shown in FIG. 2, the cutting line 13 is continuous on the front side of the workpiece 6, and a joint portion 14 connecting the inner and outer parts of the cutting line 13 is formed on the back side.

The joint portion 14 formed in this way is
Since the dimension in the same direction is smaller than the thickness of the workpiece 6, for example, even if the workpiece 6 is a thick metal, the joint part 14 can be easily broken and the product 1
2 can be extracted.

Further, even if the material of the workpiece 6 is stone or glass, for example, when the joint portion 14 is broken and the product 12 is taken out, the product 12 is less likely to be chipped, and in the unlikely event that the product 12 is chipped. Even if the cutting line 13 is continuous on the front side of the workpiece 6, chips will occur on the back side of the product 12, so some products 12 may be used as is. becomes possible.

Note that the amount of increase in the above-mentioned relative movement speed varies depending on the material, the plate thickness, the required size of the joint portion 14, etc., but on average, the speed is about 8 times the optimum cutting speed. was preferable. The amount of increase in speed may be manually input into the control device 9, but it can be automatically input by inputting the material, plate thickness, size of the joint portion 14, etc. into the control device 9. It is also possible to set the

"Effects of the Invention" As described above, according to the present invention, the cutting line is continuous on the front side of the workpiece, and a joint part connecting the inner part and the outer part can be formed on the back side. Therefore, it is possible to manufacture a joint portion that can be easily broken, and it is possible to reduce the risk of chipping of the product.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view for explaining the cutting method of the present invention, and FIG. 3 is an enlarged sectional view taken along the - line in FIG. 2. 3... Processing head, 6... Workpiece, 5... Nozzle, 9... Control device, 12... Product, 13...
Cutting line, 14...joint part, c...just before position.

Claims (1)

[Claims] 1. Injecting liquid from a machining head toward a workpiece and moving the machining head and workpiece relatively to form a continuous cutting line while cutting the workpiece. Cutting is performed, and the cutting is stopped just before the cutting line connects to the already cut cutting line, and a joint part is formed at the cutting stop part to connect the inner part and the outer part surrounded by the cutting line. In the water jet cutting method, when the cutting line reaches a position on the verge of continuation to the already cut cutting line, increasing the relative movement speed between the processing head and the workpiece while continuing the cutting process, A method for cutting a water jet, characterized in that the cutting line is continuous on the front side of the workpiece, and a joint portion connecting the inner part and the outer part is formed on the back side.