JPH08118124A - Electrodeposited tool - Google Patents

Abstract

PURPOSE: To improve productivity of a workpiece according to extending life of an electrodeposited tool. CONSTITUTION: Relating to an external diameter D1 of an electrodeposited tool 3, by eccentrically forming an internal diameter D2 by an eccentric amount (e) to contract a core diameter D3 smaller than the internal diameter D2, a flow amount of grinding fluid is ensured simultaneously with eliminating blinding a core, and by arranging a groove 10 in at least one or more parts in the vicinity of a maximum thickness part, discharging a grinding chip and flowing of the grinding fluid are smoothed. Further by providing a chamfer 11 in an edge part of the internal diameter D2 with a center C1 of the external diameter D1 serving as the center, abrasive grain coming off is reduced in a internal peripheral edge part in the vicinity of the maximum thickness part where a grinding load is applied, to attain extending life of the electrodeposited tool 3. In this way, drilling work of layer-built hard/brittle material is continuously performed, to reduce a work cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposition tool used for drilling a hard and brittle material such as a glass plate.

[0002]

2. Description of the Related Art Conventionally, as a drilling method for hard and brittle materials such as glass plates and ceramics, ultrasonic processing using free abrasive grains and processing method using a pipe-shaped tool with electrodeposited diamond grains have been adopted. Has been done. The former is a processing method in which the abrasive grains contained in the grinding fluid cause micro-cracks on the work piece due to the vibration of the tool and finely crush it.The rotation movement of the tool itself is not inevitable. That is, it is possible to process irregular shapes such as square holes. On the other hand, the latter is a processing method in which the grinding liquid is supplied to the processing location from the center of the pipe shape of the tool and the tool itself is rotated at high speed, and is limited to circular drilling. It is well known that each of the above processing methods is selected according to the purpose of the processing.

In recent years, wristwatches have come to the market as analog display clocks, digital display clocks, and even a combination full-face liquid crystal display clock that displays both. Therefore, it is necessary to form a plurality of holes in one liquid crystal cell. Conventionally, a liquid crystal cell was punched from the upper and lower sides of each liquid crystal cell by using an electrodeposition tool having a chamfer on the boundary between the shank and the electrodeposition layer having a smaller diameter than the shank. In addition, a plurality of holes (for example, four holes) have to be drilled, which causes a problem in productivity.

Therefore, an outline of a conventional technique for laminating and punching a plurality of liquid crystal cells by using a pipe-shaped electrodeposition tool in order to increase productivity will be described with reference to the drawings.

FIG. 4A is a plan view of an object to be processed such as a liquid crystal cell, and FIG. 4B is a sectional view taken along line XX thereof. FIG. 5 is a conventional pipe-shaped electrodeposition tool, FIG. 5 (a) is a front view, and FIG. 5 (b) is a plan view of its tip. FIG. 6 is an explanatory diagram of a processed state. FIG. 7 is a partially cutaway sectional view of the tip portion of the electrodeposition tool showing a state where the core is clogged.

In FIG. 5, reference numeral 1 denotes a shank, which has a metal (for example, steel) pipe shape, and 2 denotes an electrodeposition layer of diamond abrasive grains (for example, mesh # 325), which is an electrodeposition tool. The outer diameter and the inner diameter of the tip of the electrodeposited layer 2 of 30 are concentric circles.

In FIGS. 4 and 6, a plurality of workpieces 4 (for example, about eight liquid crystal cells having a thickness t = 0.61 mm) such as liquid crystal cells made of borosilicate glass are stacked, and the upper and lower sides thereof are stacked. Since chipping occurs vertically during processing, the discard plate 5 made of soda glass or the like, which is inexpensive in cost, is used.
Pressing (for example, about 0.7 mm in thickness), the processing jig 6
Fix it tightly in place on the top. Next, the electrodeposition tool 3
While supplying the cutting fluid 7 to the hole 8 at the drilling point through the 0 pipe hole, the electrodeposition tool 30 is rotated at high speed, and the arrow A
Drilling is performed in a predetermined direction at a predetermined speed. When the drilling at one place is completed, a core 90 having a thickness equal to the thickness of the workpiece 4 is produced in a laminated state as shown in FIG. The phenomenon of clogging occurs. In the structure of the electrodeposition tool 30 shown in FIG. 5, by changing the grain size of diamond to be electrodeposited,
It is possible to change processing efficiency and processing quality. For example, if the grain size of diamond is made finer, the processing quality is improved, but the processing efficiency is significantly reduced, so that selection that matches the processing purpose is required. In any case, core clogging is inevitable in the electrodeposition tool 30 having the above structure.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Has the following problems. That is, the electrodeposition tool 3
In the drilling method using 0, a method of supplying the cutting fluid 7 through the pipe hole is adopted, and the core 90 generated in the pipe inner portion 1a corresponds to the number of the workpieces 4 (for example, 8).
Is pushed up and clogs inside the pipe 1a. Therefore 1
Every time the drilling of a part is completed, the electrodeposition tool 30 is removed from the main spindle of the machine, the next drilling is performed after the core 90 is removed, and continuous drilling is impossible, which impedes productivity. To do. Further, in this case, since the core 90 that has entered the inside 1a of the pipe rotates in the same manner as the electrodeposition tool 30, the diamond particles adhering to the inner wall of the pipe of the electrodeposition tool 30 are not ground and gradually move upward. As a result, the diamond grains on the inner wall of the pipe of the electrodeposition tool 30 drop off, and the outer diameter of the core 90 gradually increases. When this phenomenon occurs, the difference between the inner diameter of the pipe of the electrodeposition tool 30 and the outer diameter of the coer 90 becomes extremely small, the flow of the grinding fluid 7 is obstructed, the supply capacity is extremely reduced, and the tip of the electrodeposition tool 30 is reduced. As a result, the tool tip becomes red hot, the life of the electrodeposition tool 30 is remarkably shortened, and a fatal problem that causes a decrease in productivity occurs.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide an electrodeposition tool which eliminates core clogging by drilling a hard and brittle material, has a long life and is excellent in productivity. To do.

[0010]

In order to achieve the above object, the electrodeposition tool according to the present invention is a pipe-shaped electrodeposition tool used for drilling a hard and brittle material such as a glass plate. The inner diameter is eccentric with respect to the outer diameter to form the tip.

Further, the present invention is characterized in that at least one groove is formed in the eccentric tip portion of the pipe-shaped electrodeposition tool.

[0012]

Therefore, in the electrodeposition tool obtained by the present invention, as described above, by eccentricizing the inner diameter with respect to the outer diameter of the electrodeposition tool, the core diameter becomes smaller than the inner diameter, and the grinding fluid It is possible to secure a sufficient flow rate, exhibit a sufficient cooling effect, and discharge the core generated in the inner diameter portion of the pipe after the completion of processing to the outside of the electrodeposition tool by the pressure of the grinding fluid. Also, the eccentric tip of the electrodeposition tool,
By forming at least one groove, grinding debris is discharged, the flow of the grinding fluid is made smooth, and the cooling effect is further ensured.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment will be described below with reference to the drawings. 1, 2 and 3 show an embodiment of the present invention.
1A is a front view showing the tip shape of the electrodeposition tool, FIG. 1B.
Is a plan view of the tip. 2 and 3 are explanatory views of a state before and after processing. In the drawings, the same members as those in the conventional technique are designated by the same reference numerals.

1 to 3, the electrodeposition tool 3 is composed of a shank 1 and an electrodeposition layer 2, and the electrodeposition tool 2 has an inner diameter D2 with respect to the center C1 of the outer diameter D1 of the electrodeposition layer 2. The center C2 is shifted, that is, the eccentricity e is set. The eccentricity amount e is set to an appropriate value as described later according to the processing purpose. By thus eccentricizing the inner diameter D2 with respect to the outer diameter D1 by the eccentric amount e, the tip shape of the electrodeposition layer 3 has a difference in wall thickness, and the machined core diameter D3 and tool inner diameter D2 are different from each other. Naturally, a gap of twice the eccentricity e is secured between them, and the grinding fluid 7 can be sufficiently supplied.

In setting the eccentricity e, the electrodeposition tool 3
When the outer diameter D1 is 2 mm, the inner diameter D2 is about 1.1 mm, and the inner diameter D2 is set to about 60% of the outer diameter D1. Eccentricity e is about 0.15 mm ± 30%, core diameter D
3 is about 0.8 mm, and the core diameter D3 is set to a value of about 70% to 75% with respect to the inner diameter D2.
For example, when the outer diameter D1 is 3 mm, the inner diameter D2 is 1.7 m
m, eccentricity e is 0.23 mm, core diameter D3 is 1.24 m
It will be about m. Further, when the outer diameter D1 is 4 mm, the inner diameter D2
Is about 2.3 mm, the eccentricity e is about 0.31 mm, and the core diameter D3 is about 1.68 mm. Therefore, if a dimension exceeding this is set, the eccentric inner diameter D2 interferes with the outer diameter D1 or an extreme difference occurs in the wall thickness of the pipe, so that it cannot be established as a tool. By properly changing the values of the eccentricity e and the inner diameter D2 of the electrodeposition tool 3 as described above, basic properties such as the discharge property of the core 9 of the electrodeposition tool 3 and the tool life can be determined. become.

Further, a groove 10 is provided at the tip of the electrodeposition layer 2 of the electrodeposition tool 3. In this embodiment, the grooves 10 are arranged at intervals of 90 degrees with respect to the eccentric direction, so that the grooves 10 are arranged in the maximum and minimum portions of the wall thickness of the pipe and in the 90 degree direction with respect to the maximum and minimum portions. Therefore, it becomes possible to disperse the grinding load applied to the maximum thickness portion at the time of drilling. Further, the minimum wall thickness is removed by providing the groove 10, and the strength balance can be maintained.
The groove 10 discharges grinding dust of hard and brittle material, and at the same time,
The flow of the grinding fluid 7 is made smooth to promote the cooling effect of the electrodeposition tool 3. In this embodiment, the groove 10 is provided at four places including the maximum thickness portion, but the present invention is not limited to this, and it is preferable to provide at least one place including the vicinity of the maximum thickness portion. .

A groove 10 provided at the tip of the electrodeposition tool 3
Depth d is set to about 15% of the outer diameter D1 of the electrodeposition tool 3. If the groove 10 is made deeper than this value, the tool strength is lowered and chipping occurs around the machined hole 8 (FIG. 4), which impairs machining quality. Further, if the groove 10 is made shallow, the supply ability of the grinding fluid 7 and the discharge property of the grinding dust are lowered, the cooling of the electrodeposition tool 3 becomes insufficient, and the tool life is shortened.

Further, as shown in FIG. 1B, about 10% of the outer diameter D1, for example, the outer diameter D1 is provided at the edge portion of the inner diameter D2 with the center C1 of the outer diameter D1 of the electrodeposition tool 3 as the center. 2m
By chamfering about 0.2 mm in m, chamfering of the inner peripheral edge portion in the vicinity of the maximum thickness portion where the grinding load is applied reduces the loss of abrasive grains at the edge portion due to the grinding process, and improves the tool life. It can be extended.

Further, as shown in FIG. 1A, the length L of the electrodeposition layer 2 of the electrodeposition tool 3 is set to about half the outer diameter D1. When the length L is set to be long, the inner core D2 is pushed up every time one of the workpieces 4 is machined, as described above, and the laminated core 9 is caught by the diamond abrasive grains. become.

Drilling of a hard and brittle material using the electrodeposition tool 3 constructed as described above will be described. FIG. 2 is an explanatory diagram showing a state at the start of processing and FIG. 3 is a state at the end of processing. 1, FIG. 2 and FIG. 3, it is the same as in the prior art that a workpiece 4 such as a liquid crystal cell is vertically fixed by closely sandwiching a discarding plate 5 to a processing jig 6. The inner diameter D2 is eccentric with respect to the outer diameter D1, and the cutting fluid 7 is processed through the pipe hole of the electrodeposition tool 3 in which the groove 10 is formed at the eccentric tip and the chamfer 11 is formed at the edge of the inner diameter D2. It is supplied to the hole-drilling point of the object 4, and while the electrodeposition tool 3 is rotated at high speed, the hole-drilling is performed at a predetermined speed in the direction of the arrow A, and when the hole-drilling at one point is completed, the workpiece 4 The core 9 having a thickness equal to that of the electrode 9 is generated in a laminated state and pushed up into the pipe of the electrodeposition tool 3, but as described above, by eccentricizing the inner diameter D2 with respect to the outer diameter D1, As a result, the core diameter D3 is reduced, the flow rate of the grinding fluid is secured, and the groove 10 also acts to exert a sufficient cooling effect. Moreover, FIG.
It is possible to discharge the core 9 clogged in the pipe inner diameter portion to the outside of the electrodeposition tool 3 by the pressure of the grinding fluid 7 as shown in FIG. Further, as described above, the groove 10 is formed at the eccentric tip portion of the electrodeposition tool 3 to discharge the grinding dust and smooth the flow of the grinding liquid 7.

The electrodeposition tool 3 is an element other than the normal wear of diamond abrasive grains, and does not deteriorate the tool life, and in a state where the work pieces 4 which are hard and brittle materials are laminated,
Completed drilling at one place, and electrodeposition tool 3
It is possible to return the electrodeposition tool 3 onto the workpiece 4 and continuously perform the next hole drilling without removing the tool from the spindle of the machine.

[0022]

As described above, according to the present invention,
In a full-screen liquid crystal timepiece that displays a combination of analog and digital required by the market, when drilling hard and brittle materials such as liquid crystal cells with multiple holes, eccentric the inner diameter with respect to the outer diameter of the tool used, Furthermore, the electrodeposition tool that forms a groove at the tip obstructs the cooling effect of the grinding fluid caused by core clogging as in the past and eliminates core clogging without shortening the tool life. The waste was discharged well, the cooling effect was improved, and it became possible to significantly extend the life of the electrodeposition tool. Therefore, it becomes possible to continuously perform drilling of laminated hard and brittle materials,
The productivity is improved, and it is possible to process at a low cost, which is a great effect.

[Brief description of drawings]

FIG. 1 is an electrodeposition tool according to an embodiment of the present invention.
FIG. 1A is a front view, and FIG. 1B is a plan view of a tip portion thereof.

FIG. 2 is an explanatory view showing a state before drilling using the electrodeposition tool of FIG.

FIG. 3 is an explanatory diagram showing a state after drilling using the electrodeposition tool of FIG. 1.

FIG. 4A is a plan view of a liquid crystal cell as a workpiece, and FIG. 4B is a sectional view taken along line XX thereof.

5 (a) is a front view and FIG. 5 (b) is a plan view of a tip portion thereof, showing an electrodeposition tool according to a conventional technique.

FIG. 6 is an explanatory view showing a state before drilling using the electrodeposition tool of FIG. 5.

FIG. 7 is a partially cutaway cross-sectional view of an electrodeposition tool showing a state of core clogging.

[Explanation of symbols]

 1 Shank 2 Electroplated layer 3 Electroplated tool 4 Workpiece 5 Discarding plate 7 Grinding liquid 8 Hole 9 Core 10 Groove 11 Chamfering D1 Outer diameter D2 Inner diameter D3 Core diameter d Groove depth e Eccentricity

Claims (2)

[Claims] 1. A pipe-shaped electrodeposition tool used for drilling a hard and brittle material such as a glass plate, wherein an inner diameter is eccentric with respect to an outer diameter of the electrodeposition tool to form a tip portion. An electrodeposition tool. 2. The electrodeposition tool according to claim 1, wherein at least one groove is formed at an eccentric tip portion of the pipe-shaped electrodeposition tool.