JPH02109617A - Method and device for machining hole of ceramic material - Google Patents

Abstract

PURPOSE:To carry out the machining of a hole smoothly and favorably by jetting air out of an air jet-out port on the end face through the air passage inside a drill having a straight groove and forcedly discharging chips to the outside. CONSTITUTION:A drill 10 consists of a shank portion 12 and a cemented carbide tip 16 having a cutting edge portion 14 on its end, and a V-shaped straight groove 18 is provided continuously along the axial direction on both while forming an air passage 20 inside. This air passage 20 is opened on the end face of the tip 16 forming an air jet-out port 22. At the time of machining holes by the drill 10, air which is fed through an air feed pipe is jetted out of the end of the drill 10 to discharge the chips of a compact out of the hole by means of the air. Hence, there is no fear of causing a crack to the compact 15 due to the clogging of chips.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method and apparatus for drilling holes in ceramic substrates.

(Conventional technology) When constructing the walls of a building using tiles.

It is necessary to physically fix the tile to the frame so that the tile does not fall off or fall from the frame. Therefore, as shown in FIG.

This was then firmly fixed to the frame using fixing metal fittings, anchor bolts, etc.

By the way, in this case, it is necessary to prevent the male screw member 102 etc. that protrudes from the back side of the tile 100 from coming out from the tile lOO, so as shown in the same figure and FIG. 6, a hole 104 is made on the back side of the tile. At the same time, a side hole 106 with a relatively small diameter and deep depth is opened from the side end surface side of the tile 100, and a retainer 7108 is inserted therein so as to pass through the male thread member 102. , due to the action of the retainer 108,
It was designed to prevent the male threaded member 102 and the like from coming off.

Conventionally, the horizontal holes 10B were drilled in the tile 100 using a drill having a spiral helical blade at the stage of forming a green body formed by press-molding a powder raw material. When holes are drilled into the tile molded body after firing, it takes a very long time to drill one hole, and the drill wears out rapidly.
Since only one or two holes could be made in the molded body, the holes were made in the soft green material before firing.

(Problems to be Solved by the Invention) However, when drilling holes in such a low-strength compact before firing, another difficult problem arises.

In other words, when drilling a small-diameter deep hole from the side end face of a tile molded body, if the drill penetrates into the molded body to a certain depth, the shavings will not be able to be smoothly discharged to the outside through the twisted groove of the drill. It becomes stuck inside the hole. Therefore, if the drill is penetrated deeper in such a state, the area around the hole-machined part of the tile molded object will be distorted and cracks will occur around the hole, or the surface layer of the tile molded object will rise and peel. It occurs.

(Means for Solving the Problems) The invention of the present application was made to solve such problems, and the first solution of the present application relates to a hole machining method, and the gist thereof is as follows. In this method, a drill having an air passage extending in the axial direction inside and having a straight groove in the axial direction such as a cursor shape at a predetermined location on the outer circumferential surface of at least the tip processing portion is rotated and penetrated into the ceramic base material, and at the same time. The air supplied through the air passage is ejected from an air outlet at the tip of the drill, and the air forcibly discharges cuttings to the outside through the straight groove of the drill.

(Operations and effects of the first solution) That is, in the present invention, a drill with a straight groove is used instead of a conventional twisted-edge drill, and air is supplied to the tip surface through an air passage formed inside the drill. Air is ejected from the spout, and the air forces the cuttings to be discharged to the outside of the hole through the straight groove of the drill.

In this way, the shavings are well discharged, and therefore, even when drilling holes in the tile molded body in the green state, distortion due to clogging of shavings does not occur, and therefore cracks due to such distortion will not occur. It becomes possible to perform hole drilling smoothly and efficiently without causing peeling of the surface layer or the like.

This significantly reduces product defect rates and reduces processing time.

The drill with a straight groove in the shape of a 7-shape is the 0 drill, which is used as a gun drill for drilling deep holes in steel and castings.
The present invention is characterized in that a drill having a straight groove of this kind is used for drilling holes in ceramic substrates.
Instead of jetting out high-pressure oil from the opening at the tip of the drill to break up the powder, the present invention jets out air.

(Second Means for Solving the Problems) The second means for solving the problems of the present application relates to a hole machining device suitable for implementing the above method, and its gist is as follows.

(a) (4) It has an air passage extending in the axial direction inside, and has a straight groove in the axial direction, such as a cursor shape, at least at a predetermined location on the outer circumferential surface of the tip processing portion, and has an air outlet on the tip surface. a drill, (o) a holder that rotatably holds the drill; and (c) a holder that rotates the drill and moves the drill along with the holder back and forth in the axial direction by an amount corresponding to the depth of the hole in the ceramic base to be machined. a processing unit comprising:

(b) an air supply means for supplying air into the air passage of the drill; and (c) a position adjustment m that holds the processing unit and adjusts the holding position according to the dimensions of the ceramic base to be processed.
The purpose is to have a mechanism and .

(Operations and effects of the second solution) In the apparatus of the present invention, when the dimensions of the ceramic molded body change, the position adjustment mechanism positions the drill at the appropriate position. You can do JS. For this reason, the drill driving means only needs to move the drill forward and backward in the axial direction by the minimum stroke required to drill a hole. By adjusting the initial position of the drill using the one-position adjustment mechanism, it is possible to respond well to changes in the dimensions of the ceramic molded body.

In addition, since the length of the drill can be reduced to the minimum required length, it is possible to minimize the contact of the drill core when drilling holes.
Hole machining can be performed with high precision.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an example of a drill used in the present invention (formally a type of gun drill), and is composed of a shank portion 12 and a carbide tip 16 having a cutting portion 14 at the tip. These carbide tips16. Shank part 1
2 is provided with 7-shaped straight grooves 18 that are continuous with each other along the axial direction, and an air passage 20 is formed inside the groove. Air passage 20 is chip 1
The air outlet 22 is opened at the tip surface of 6 (Fig. 1(c)).
In addition, in this drill 10, the tip 1
The tip 24 (apex) of the blade portion 14 at 6 is located at a distance of D/3 (D is the diameter) from the outer peripheral surface.

In FIGS. 2 and 3, reference numeral 26 designates the base of a device for drilling holes in a ceramic molded body (here, a green ceramic tile green molded body 15) using the drill 10, and on the A pair of movable tables 28 are arranged parallel to each other. These moving platforms 28 are the rails 3
0 on the base 26, and the motor 3
2 (FIG. 2), it is possible to move the rail 30 in the vertical direction (in reality, horizontal direction) in FIG. 2 by the screw feeding action of the screw shaft 34 rotating.

A pair of holding frames 36 are arranged on the upper surfaces of both ends of these two movable tables 28 so as to face each other. Each holding frame 36 is movable back and forth on a rail 38 disposed along the longitudinal direction of the movable table 28. Further, arms 40 extend from these holding frames 36, and a cylindrical member 42 is fixed to the distal end thereof, and a male threaded shaft 44 is screwed into the female threaded hole of the arm 40. The male threaded shaft 44 is rotated by a handle 46, and the rotation of the male threaded shaft 44 causes the holding frame 36 to be threaded on the rail 38.

Processing units 48 and 50 are held at the upper end and front end of the holding frame 36, respectively. One machining unit 48 is for machining a hole of a predetermined hole diameter and depth (here, the hole diameter is 51φ and the depth is 70 mm) from the side end surface of the ceramic tile green molded body 15. , and the other processing unit 50 cuts a predetermined hole diameter from the back side of the molded body 15.
A hole having a depth (here, a hole diameter of 91 layers and a depth of 15 layers) is machined, and the holes are arranged at an angle of 90 degrees to each other.

As shown in FIG. 4, the processing unit 48 for drilling a hole from the side end surface of the molded body 15 includes a drill 10, a holder 54 that rotatably holds the drill 10, and a rotational drive shaft that rotationally drives the drill 10. 56, and these drills 10. The rotation drive shaft 56 of the holder 541 is moved forward and backward in the axial direction by a predetermined stroke (minimum stroke required for drilling) by a forward and backward drive device 58.

Further, an air supply pipe 60 is connected to the holder 54, and air from the air supply pipe 60 is ejected from its tip through the air passage 20 of the drill IO.

The basic configuration of the additional unit 50 is also the same as that of the processing unit 48, so a detailed explanation will be omitted.

Next, the operation of this device is performed on the ceramic tile green molded body 15.
(Here, the size of the hole is 450 x 450 x 20 IIm) and will be explained along with the procedure for drilling the hole.

First, the molded body 15 is on a separate production line.

As shown in FIG. 3, the suction device 64 is sucked and placed on the table 62 of the processing device, and the suction device 64 retreats.
Next, each drill 10 of the processing units 48 and 50 moves forward by a predetermined stroke and drills a total of four
Drill each hole individually. Note that the drills 10 of the machining units 48 and 50 advance simultaneously, but because the forward stroke of the drill 10 of the machining unit 50 is short (the depth of the hole is shallow), the drill 10 of the other machining unit 48 continues to advance. While I was at it, I finished drilling the holes and retreated. Therefore, both drills 10 do not interfere.

In the device of this example, when each drill IO drills a hole, air sent through the air supply pipe 60 is ejected from the tip of the drill IO, and the shavings of the molded body 15 are discharged to the outside of the hole by the air. be done. Therefore, the molded body 15 will not be cracked due to clogging with shavings.

By the way, the air pressure is 1 kgf/c■2, the rotation speed of the drill is 100 Or p m, and the feed rate of the drill is 0.4.
When drilling a hole of the above size in mm/sec, the machining time was reduced from about 60 seconds/l6 to about 10 mm/sec.
seconds/one hole, and the defect rate was reduced from 30% to 12%.
%.

The device of this example can adjust the position of the drill 10 to an appropriate position by changing the positions of the moving table 28 and the holding frame 36 using the male screw shafts 34 and 44, so the length of the drill lO and the forward/backward stroke can be adjusted. It is possible to set the minimum length and minimum stroke, respectively. For this reason, molding 7
Even if the dimensions of the body 15 change, hole machining can be performed quickly and with high precision without any problems.

Although the embodiments of the present invention have been described in detail above, the present invention can be configured and implemented in other forms and aspects.

For example, the present invention is particularly effective when applied to drilling holes in green compacts, but can also be applied to drilling holes in pre-fired or main fired compacts by using a drill with a processing section made of carbide tips. Applicable.

Furthermore, the present invention can be applied to drilling holes in ceramic bases other than the above-mentioned ceramics, and can be constructed and implemented in various forms and modes without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a drill used in the present invention, and FIGS. 2 and 3 are a plan view and a front view showing an example of the processing apparatus of the present invention. FIG. 4 is a partially cutaway front view showing the configuration of the main parts of the processing unit in the processing device, and FIGS. 5 and 6 are explanatory diagrams for explaining the method of fixing the tiles to the building, respectively. . lO nitrile 15: Green molded body 18 Nistrade groove 20: Air passage 22: Air jet port 3
0, 38: Rail 32: Motor 34, 44
: Male thread shaft 36: Holding frame 46: Handle 4
g, 50: Processing unit 54: Holder 56: Rotating shaft 58 Binary forward/backward drive device 60: Air supply pipe

Claims (2)

[Claims] (1) A drill having an air passage extending in the axial direction and having a straight groove in the axial direction such as a V-shape at a predetermined portion on the outer peripheral surface of at least the tip processing portion is rotated and inserted into the ceramic base; At the same time, the air supplied through the air passage is ejected from an air outlet on the tip face of the drill, and the air forcibly discharges cuttings to the outside through the straight groove of the drill. Method. (2) (a) (a) It has an air passage extending in the axial direction inside, and is provided with an axial straight groove such as an L-shape on at least a predetermined portion on the outer circumferential surface of the tip processing portion, and has an air jet on the tip surface. a drill having an outlet; (b) a holder that rotatably holds the drill; and (c) a shaft that rotates the drill and holds the drill together with the holder by an amount corresponding to the depth of the hole in the ceramic base to be machined. (b) an air supply means for supplying air into the air passage of the drill; and (c) a processing unit that holds the processing unit and provides a drive means for moving the ceramic material to be processed. A hole processing device for a ceramic base, comprising: a position adjustment mechanism that adjusts a holding position according to dimensions;