JP4132200B2 - Drilling method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for drilling a green body of a sanitary ware, and a drilling device suitable for use in this method.
[0002]
[Prior art]
When manufacturing sanitary ware such as toilet bowls, tanks for storing toilet flushing water, wash basins, hand-washers, etc., products can be obtained through steps such as drying, hanging and firing after molding by slip casting .
[0003]
In order to form a hole in this sanitary ware, a hole is made in the green body. Conventionally, in order to make a hole in this green body molded body, one surface side of the green body molded body is applied to a backing plate, and a cylindrical jig is pressed from the other surface side of the green body molded body to punch a hole. When the hole is an elongated long hole, the green body is cut by a knife to make a hole.
[0004]
[Problems to be solved by the invention]
(1) The method of applying a hole with a jig to one side of the green molded body against the backing plate is to make a hole only in the product or part where the backing plate can be opened on the one side of the green molded body. Can not. (If the jig is pressed without applying the backing plate, the green body will be deformed in the direction of pressing the jig.) For this reason, for example, in a portion having a double shell structure such as an overflow port of a basin. For drilling, this method cannot be applied, and manual operation using a knife is unavoidable, but the work efficiency is remarkably low and labor costs are high.
[0005]
A first object of the present invention is to provide a method and an apparatus capable of efficiently drilling a hole in a green body.
[0006]
{Circle around (2)} Even when the contact plate is used as described above, a large burr is likely to occur at the edge of the hole. The second object of the present invention is to provide a drilling method and apparatus with very few burrs. Moreover, an object of this invention is to provide the drilling method and apparatus which can discharge | emit drilling waste from a jig | tool easily.
[0007]
[Means for Solving the Problems]
The drilling method of the present invention is a method for drilling a green body of a sanitary ware, by bringing a jig having a hollow portion on the front end surface into contact with the green body and applying ultrasonic vibration. In addition, the hole is only decompressed in the cavity of the jig, and the drilling waste is drawn into the cavity .
[0008]
According to this drilling method, the jig can be efficiently drilled by ultrasonically vibrating the jig.
[0009]
In the case of drilling in this way, by reducing the pressure in the cavity of the jig, the drilling waste can be drawn into the cavity and drilling can be performed without using a backing plate. Also, if the inside of the cavity of the jig is depressurized in this way, the inner region is drawn into the cavity from the portion of the green body that the jig hits, so that the green body is being pushed out. A certain part comes to be pressed against the tip of the jig, the cut end of the green body is sharp, and burrs are hardly generated.
[0010]
The punching waste of the green body molded body drawn into the cavity of the jig is easily discharged from the cavity by pressurizing the cavity.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of a drilling device according to an embodiment, and FIG. 2 is an explanatory diagram of a drilling method.
[0012]
This drilling device includes a jig 1 connected to an ultrasonic generator 12 at the tip of a robot arm 2. The jig 1 has a columnar shape, and a circular recessed hole-shaped cavity 3 is provided on the tip surface thereof. The inside of the tube 5 connected to the side surface of the jig 1 communicates with the inside of the hollow portion 3 through the communication hole 4. The tube 5 is connected to a negative pressure port of a venturi negative pressure generator 8 via a three-way joint 6 and a tube 7.
[0013]
The air inlet port of the negative pressure generator 8 is connected to an air tube 11 via a three-way switching valve 9. The switching valve 9 is connected to the three-way joint 6 via a tube 10. By causing the air from the air tube 11 to flow to the negative pressure generator 8 by the three-way switching valve 9, negative pressure is generated in the negative pressure generator 8, and the inside of the cavity 3 can be decompressed via the tubes 7, 5 and the communication hole 4. It is said.
[0014]
By switching the three-way switching valve 9 and allowing air to flow through the tube 10, the inside of the cavity 3 can be pressurized.
[0015]
Note that the ultrasonic generator 12 provided at the distal end of the robot arm 2 is configured to ultrasonically vibrate the jig 1 in the longitudinal direction (left-right direction in FIG. 1). As this ultrasonic generator, one that generates ultrasonic vibration of several KHz to several tens KHz is preferable.
[0016]
In order to make a hole in the green molded body 20 using the thus configured drilling device, the inside of the cavity 3 is depressurized as shown in FIG. Vibrates with sound waves. And the jig | tool 1 is contact | abutted to the green base molded object 20 without using a backing plate, and is advanced slowly. If it does so, the blade edge | tip part of the front-end | tip of the jig | tool 1 will dig smoothly into the green body molded object 20, and the green body molded object 20 will be cut off circularly before long. At this time, the green body 20 in the inner region C from the front end edge of the jig 1 is sucked and drawn into the cavity 3 so that the green body 20 is pressed against the cutting edge of the jig 1. As a result, the green body 20 is cut off smoothly, and no or almost no burrs are generated.
[0017]
When the inside of the cavity 3 is not decompressed as shown in FIG. 2 (b), the green compact 20 is deformed so as to bulge as the jig 1 advances, and the jig 1 is bulged. A large amount of burrs are generated when the green body 20 is pushed out (for this reason, in the case of FIG. 2B, it is necessary to apply a backing plate to the opposite side of the green body 20). . On the other hand, according to the method of the present invention shown in FIG. 2A, the green body 20 in the inner region C is sucked inward in the cavity 3 even at the moment when the jig 1 penetrates the green body 20. Therefore, the corner edge of the hole is extremely sharp and no or little burr is generated.
[0018]
After the jig 1 has penetrated the green body 20, the jig 1 is pulled out from the green body 20, the jig 1 is moved to the drilling waste discharge zone, and then the three-way switching valve 9 is switched to form a cavity. 3 is pressurized. Thereby, drilling waste is discharged from the cavity 3. Thereafter, the tip of the jig 1 is immersed in water (in this case, it is preferable to operate the ultrasonic generator 12), the jig 1 is washed with water, and the process returns to the next drilling step.
[0019]
In the above embodiment, the jig 1 has a cylindrical shape, but it is obvious that other shapes may be used. 3 and 4 show an example, and in FIG. 3, the tip of the jig 30 is a slope. In FIG. 4, the jig 40 has a flat shape, which is suitable for opening the overflow port of the basin. Of course, according to the present invention, holes having various shapes can be formed using jigs having shapes other than these.
[0020]
【The invention's effect】
As described above, according to the drilling method and apparatus of the present invention, it is possible to efficiently drill a green body. In particular, generation of burrs can be prevented by reducing the pressure inside the cavity of the jig. Moreover, drilling waste can be easily discharged by pressurizing the inside of the cavity.
[Brief description of the drawings]
FIG. 1 is a side view of a drilling device according to an embodiment.
FIG. 2 is an explanatory diagram of a drilling method.
FIGS. 3A and 3B are configuration diagrams of a jig used in a drilling apparatus according to another embodiment, wherein FIG. 3A is a side view and FIG. 3B is a front view.
FIG. 4 is a perspective view of a jig used in a drilling device according to still another embodiment.
[Explanation of symbols]
1, 30, 40 Jig 2 Robot arm 3 Cavity 4 Communication hole 5, 7, 10, 11 Tube 8 Negative pressure generator 9 Switching valve 12 Ultrasonic generator

Claims (5)

In the method of drilling in the green body of sanitary ware, drilling is performed by contacting the green body with a jig whose tip side is a cavity and applying ultrasonic vibration ,
A drilling method characterized in that a hole is drawn into the cavity by depressurizing the inside of the cavity of the jig . 2. The drilling method according to claim 1 , wherein after the hole is formed, the inside of the cavity of the jig is pressurized to discharge the drilling waste from the cavity. 3. According to claim 1 or 2, drilling method characterized by applying ultrasonic vibration in a longitudinal direction of the jig. A drilling jig whose tip side is a cavity, an ultrasonic generator for ultrasonically vibrating the jig, and a suction device capable of sucking the inside of the cavity ,
A punching device for a green body of a sanitary ware, comprising a pressurizing device capable of pressurizing the inside of the cavity . 5. The punching device for a green body of a sanitary ware according to claim 4 , wherein the ultrasonic generator vibrates the jig in the longitudinal direction.

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