JP2649628B2 - Equipment for processing brittle materials by water jet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a water jet processing apparatus, and more particularly to an improved processing apparatus capable of appropriately cutting a brittle material (mainly glass).

[0002]

2. Description of the Related Art Conventionally, in cutting a brittle material such as glass in a water jet processing apparatus, an abrasive jet in which an abrasive is mixed into ultra-high pressure water is used. And the cutting of brittle materials is similar to the processing of metals, etc.
A water jet is projected onto the cut portion to cut the workpiece at a constant relative moving speed between the work and the nozzle.

[0003] When a brittle material such as glass is cut by the above-described method of cutting at a constant speed, a phenomenon that the glass is broken or chipped at the processing end portion has occurred. As shown in FIG.
It has been found that the water jet 3 is jetted on the surface of the glass 2 and cut off, causing the water jet 3 to be delayed with respect to the relative moving speed of the glass 2 and the nozzle 1. As a result of this delay, before the end of the glass 2 is completely cut, the glass at the cut portion falls by its own weight,
Was sometimes cracked or missing. In addition, 4 in FIG.
Is a cut portion, and 5 is an uncut portion.

[0004]

Therefore, according to the present invention, there is provided a deceleration condition table which is determined so that the feed speed is gradually reduced from just before a processing end portion of a brittle material to finish cutting.
It is an object of the present invention to provide a water jet processing apparatus capable of preventing a brittle material such as glass from cracking or chipping by cutting under processing conditions according to a deceleration condition table.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, a normal processing speed, which is a relative moving speed of a nozzle and a work determined by a material, a plate thickness and a processing surface accuracy of the work, and the processing speed A deceleration condition table that defines a deceleration start position and an end portion processing speed is provided. provide.

[0006]

Embodiments of the present invention will be described below. FIG.
FIG. 1 is a schematic view of an abrasive type water jet processing apparatus used in the present invention.
1, a cutting head 12, a work table 13, an abrasive supply system 14, and a drainage tank 15.
The work is mixed with the abrasive in the work 2 and is sprayed onto the work (material) on the work table 13 by the nozzle 1 to cut the work. The arrows in the figure indicate the flow of water or abrasive.

In FIG. 2, reference numeral 16 denotes an operation panel of the water jet processing apparatus, and 17 denotes the control panel. Operation panel 16
Is provided with a deceleration condition table. The deceleration condition table includes a normal processing speed, which is a relative moving speed between the nozzle and the work, which is determined according to the material, plate thickness, and processing surface accuracy of the work. The deceleration information of the deceleration start position and the end processing speed is determined and displayed.

FIG. 1 shows an embodiment of a deceleration condition table, in which columns of material, plate thickness, processing speed (normal processing speed), end speed (end processing speed), and deceleration start point are arranged in a column from the left. Are provided, and the conditions corresponding to each are described in rows.

First, in the column of material, a row of glass is described as an example of a brittle material, and a row of aluminum and a row of stainless steel are described as examples of other metals. Of course, the characteristic of the deceleration condition table according to the present invention is a portion relating to the brittle material.

There is a row of plate thickness on the right of the row of material. The unit of the number described here is millimeter, and each row of the glass has three sections of 5 mm, 10 mm, and 15 mm. This division is an example, and it goes without saying that there are other examples depending on the type of the water jet processing apparatus used, the material to be processed, and the thickness of the sheet.

There is a row of processing speeds on the right of the row of plate thickness. The unit of the number described here is millimeters (per minute). For example, a row of glass having a thickness of 5 millimeters includes a row of 4500 millimeters per minute and a row of 2000 millimeters per minute. This row of the processing speed indicates the relative moving speed of the nozzle 1 and the glass 2 as the work until the deceleration start point after the piercing (start point perforation) by the water jet.

The reason why the two types of processing speed rows are set according to the plate thickness is due to the difference in processing accuracy of the cut surface, and is not limited to the two types. In addition, a workpiece having a low processing speed is applied to a workpiece that requires high processing accuracy of a cut surface.

On the right side of the column of the processing speed, there is a column of the end portion processing speed. In FIG. 1, it is abbreviated as terminal speed. The unit is millimeters (per minute), the material is glass, and the work having a plate thickness of 5 millimeters is both 200 millimeters (per minute).

A row of the deceleration start position is on the right of the row of the end processing speed. In FIG. 1, a deceleration start point is displayed. If the processing speed is 4500 mm / min for a glass material with a thickness of 5 mm, the deceleration start position is 10 mm before the end of processing, and if the processing speed is 2000 mm / min for the same work, the deceleration start position is It is 5 mm before the processing end.

These deceleration conditions vary depending on the material of the abrasive mixed in the water jet, the supply amount of the abrasive, the jet pressure of the water jet, and the like.
The normal machining speed starts deceleration at the deceleration start position, and the deceleration state until the end of machining is preferably stepless deceleration as shown by a solid line in FIG. 3, but stepped as shown by a dotted line in FIG. The purpose is achieved even with deceleration (three-step deceleration indicated by the dotted line). In FIG. 3, the axis A indicates the relative moving speed of the workpiece and the nozzle, the axis B indicates the cutting distance, and the point C indicates the processing end point.

[0016]

In order to use the apparatus for processing a brittle material by a water jet according to the present invention, an operator needs to
When the material and the thickness are input, the deceleration condition table is called. Processing conditions are determined according to the display of the deceleration condition table, and processing information is input. The control panel 17 changes the relative moving speed of the nozzle and the work according to the input processing conditions, and performs cutting processing of the brittle material.

For example, when a glass material and a plate thickness of 5 mm are input, a deceleration condition table is called. Therefore,
Processing speed 4500 mm (per minute), terminal speed 20
It is assumed that information of 0 mm (per minute) and 10 mm before the deceleration start point is selected and input.

Based on this information, after piercing, the water jet processing apparatus relatively moves the nozzle 1 and the work at a processing speed of 4500 millimeters (per minute), and performs cutting by water jet injection. When the water jet 3 comes 10 mm before the processing end, it recognizes that it is the deceleration starting point, and the terminal speed is reduced to 200 mm per minute.

[0019]

As described above, according to the present invention, a deceleration condition table is provided in which the feed speed is gradually reduced from just before the processing end portion of the brittle material and cutting is completed, and instructions from the deceleration condition table are provided. Therefore, a cutting operation without cracking or chipping can be performed even when brittle materials such as glass are cut.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a deceleration condition table.

FIG. 2 is a schematic diagram showing the entire water jet processing apparatus.

FIG. 3 is an explanatory diagram showing a relative movement speed change between a work and a nozzle.

FIG. 4 is a schematic diagram showing a delay of a water jet unit.

[Explanation of symbols]

 1. . . Nozzle 2. . . Glass 3. . . Water jet 4. . . Cut part 5. . . Uncut part 11. . Ultra high pressure pump 12. . Cutting head 13. . Work table 14. . Abrasive supply system 15. . Drainage tank 16. . Operation panel 17. . control panel

Claims (1)

(57) [Claims] 1. A normal processing speed which is a relative moving speed of a nozzle and a work determined according to a material, a plate thickness and a processing surface accuracy of a work, a deceleration start position of the processing speed and a deceleration which defines a processing speed of an end portion. A processing apparatus for a brittle material by a water jet, comprising a condition table, and a mechanism for changing a relative moving speed between the nozzle and the work according to an instruction from the deceleration condition table