JPH0644598Y2 - Abrasive nozzle head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an abrasive jet nozzle, and relates to an improvement of a nozzle head capable of confirming a movement trajectory of the nozzle.

[Prior Art] A large number of technologies using high-pressure fluid jets for object processing such as cutting have already been put to practical use.

High-pressure fluid jet machining has the features that the machining margin is extremely small, the heat generation during machining is extremely small, the wear of machining tools can be ignored, and the generation of machining chips is extremely small. It is used in a wide range of fields such as machining and electronics. In recent years, abrasive jet processing has been used in which an abrasive is jetted together with water.

Many of the abrasive cutting devices have a computer built in the control device, and are configured to store a target machining shape in advance and move a nozzle in accordance with the memorized machining shape to machine a workpiece.

Conventionally, before processing a work piece, a needle-shaped object is attached to the tip of the nozzle to check the program, the program is executed, and the checking trajectory of the nozzle is traced. A confirmation method was used in which the movement locus was traced in order while being sprayed on.

[Problems to be solved by the invention] In such a situation, although the target machining shape is relatively simple, or a two-dimensional plane does not cause much difficulty in simulating, the target machining shape does not occur. If there are many free curves, complicated shapes with many irregularities, or complicated three-dimensional processing, there is a state where the needle cannot approach the work piece by the method of attaching the needle to the nozzle tip,
It is difficult to confirm the cutting line. In addition, the movement trajectory is blocked by the nozzle and needle, making it difficult to confirm. The workpiece may be damaged or deformed due to dimensional error or programming error.

Therefore, it is necessary to take measures such as extremely reducing the speed and partially modifying the original program.

According to the method of actually ejecting a liquid having a very low pressure, since the liquid is ejected from the nozzle, it is difficult to determine the exact position due to the splash of water, and the working environment is deteriorated.

Therefore, with the spread of the three-dimensional abrasive cutting device, it is desired to improve the accuracy and simplification of the program confirmation work.

[Means for Solving the Problems] As means for solving the above problems, a water nozzle, an abrasive nozzle disposed downstream of the water nozzle, and a water nozzle formed between the water nozzle and the abrasive nozzle are formed. In a nozzle head comprising a mixing chamber and an abrasive supply hole opening to the mixing chamber, an optical fiber inserted from the abrasive supply hole into the abrasive nozzle through the mixing chamber, and an optical fiber engaged with the abrasive supply hole, And an exchangeable hose that can be exchanged, and has a structure in which one end to be inserted into the abrasive nozzle of the optical fiber is formed into a spherical shape and the other end is connected to the light source section.

[Embodiment] The present invention will be described in detail below based on an embodiment.

In the figure, the cutting device 11 shows a manipulator applied to three-dimensional processing. The arm 16 at the tip of the cutting device 11 is configured to be driven three-dimensionally, and a nozzle head 17 can be attached to and detached from the tip of the arm 16 as required.

In the nozzle head 17 attached to the tip of the arm 16 of the present invention, the abrasive supply hole 5 is opened in the mixing chamber 9 formed between the water nozzle 3 and the abrasive nozzle 6, and the mixing chamber is introduced from the abrasive supply hole 5. An optical fiber 18 connected from a light source unit 12 via 9 is attached to the abrasive nozzle 6.

Regarding the program confirmation procedure, the example shows the workpiece
The nozzle head 17 is moved to a desired position so that the light beam projected onto the workpiece 14 is irradiated onto the processed portion of the workpiece 14.

Fine adjustment is performed so that the light beam is projected onto the workpiece 14 at an optimum angle at a desired position. That is, it is effective if the streamline of the fluid ejected from the abrasive nozzle 6 in cutting the workpiece 14 is perpendicular to the workpiece 14.

As for the projection from the optical fiber 18 to the work piece 14, when the light ray is projected at a right angle to the work piece 14, the light ray is transmitted to the work piece 14 in a circular shape. Therefore, the optimum position can be obtained by adjusting so that the light beam is projected on the workpiece 14 in a state as close to a circle as possible.

Next, the optical fiber 18 is removed from the abrasive nozzle 6, and the abrasive pipe 8 is attached to the abrasive supply hole 5. Then, according to the program, nozzle head 17
Moves along the path that is cut by. By the way, in the fluid jetting process, the high-pressure fluid jetted from the abrasive nozzle 6 forms a thread-like streamline immediately after jetting, but gradually diffuses due to air resistance or the like, and finally becomes a droplet. What is supplied to the water jet is the thread-like streamlined portion and the diffusion fluid itself maintains a considerable flow velocity even if it diffuses,
In addition, it is a portion where a thread-shaped streamline segment remains in the center.

In such a range that can be applied to processing such as cutting,
The thickness of the streamline immediately after being ejected from the abrasive nozzle 6 and the thickness of the streamline at a position separated by a predetermined distance from the abrasive nozzle 6 are different, and gradually increase as the distance from the abrasive nozzle 6 increases. There is. That is, the cutting margin tends to increase. However, the optical fiber 18 used as a simulating means in the present invention emits light rays linearly from the end face, and it is difficult to directly simulate the above-mentioned water scattering or streamline expansion. . Therefore, by forming the light emitting end face of the optical fiber 18 into a spherical shape, a lens effect is imparted, and it is intended to simulate the scattering of water or the expansion of streamlines by diffusing light rays, and effectively. It has achieved its purpose.

Therefore, a shape close to the shape of the fluid jet is formed in the light beam,
The program is confirmed by a simulation that is close to the actual one.

After checking the program, remove the optical fiber 18,
When the abrasive pipe 8 is installed in the abrasive supply hole 5, the cutting can be performed immediately.

[Advantages of the Invention] According to the present invention as shown in the above embodiment, the deformation and damage of the workpiece due to the program confirmation can be eliminated, the confirmation speed can be confirmed at the actual speed, and the injection fluid Since you can check the cutting margin by simulating the diffusion state,
This made it possible to perform a simulation that is close to the actual situation, and improved the accuracy and simplification of the program confirmation work.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view showing an example of a cutting device applicable to the present invention. FIG. 2 is a longitudinal sectional view of an embodiment in which an optical fiber is attached to an abrasive nozzle according to the present invention, FIG. 3 is an external view of a conventional nozzle head tip with a needle attached to the tip of the nozzle head, and FIG. FIG. 5 is a detailed view of the tip of the nozzle head, FIG. 5 is a projection state diagram of an inappropriate position for projecting a light beam onto a workpiece, FIG. 6 is a projection state diagram of an optimal position for projecting a light beam onto a workpiece, and FIG. It is a longitudinal cross-sectional view of an abrasive nozzle. 3: Water nozzle 5: Abrasive supply hole 6: Abrasive nozzle 8: Abrasive pipe 9: Mixing chamber 11: Cutting device 12: Light source part 14: Workpiece 16: Arm 17: Nozzle head 18: Optical fiber 19 :needle

Claims (1)

[Scope of utility model registration request] 1. A water nozzle, an abrasive nozzle disposed downstream of the water nozzle, a mixing chamber formed between the water nozzle and the abrasive nozzle, and an abrasive feed hole opening to the mixing chamber. In the nozzle head consisting of, an optical fiber that is inserted into the abrasive nozzle through the mixing chamber from the abrasive supply hole, and an abrasive pipe that engages with the abrasive supply hole and is replaceable with the optical fiber. And an optical fiber, wherein one end of the optical fiber to be inserted into the abrasive nozzle is formed into a spherical shape, and the other end is connected to a light source unit.