JPH05208331A - Grinding device for cutting tool - Google Patents

Abstract

PURPOSE:To perform grinding and electric discharge coat hardening, of the cutting edge face of a cutting tool easily and precisely in the condition of fixing the cutting tool on a table. CONSTITUTION:A table 1 to fix a cutting tool 4, a rotational grinding wheel 5 having the grinding face 5a in parallel with the cutting edge face 4a of the cutting tool, and a rotary coating hardening electrode 6 are provided, and grinding and electric discharge coating hardening of the cutting edge face are processed in the condition of fixing the cutting tool on the table by work feeding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool grinding apparatus.

[0002]

2. Description of the Related Art The cutting edge of a cutting tool such as a drill is
The blade surface is shaped and polished at an angle of 45 ° from the central axis.
Conventionally, it has been necessary to prepare a special jig when using a normal grinder for polishing the cutting edge. Further, in order to impart wear resistance to the cutting edge, a cemented carbide material is subjected to discharge coating treatment. This discharge coating is performed by vibrating a cemented carbide tip such as WC against the blade surface of the drill while separating and vibrating it. A pulse treatment is repeated between the carbide tip and the drill, and the pulse discharge heat melts the tip discharge point of the carbide tip minute by minute, and a coating treatment is performed to dislocation weld to the drill side with a large amount of heat. ing. However, according to this conventional method, the inclination angle of the blade surface, the accuracy of the covering surface, and the like are not good, and the cutting performance deteriorates, making it impossible to perform accurate drilling.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a grinding device capable of easily and precisely grinding a blade surface and hardening an electric discharge coating while a cutting tool is fixed on a table. ..

[0004]

A table for fixing and cutting and feeding a cutting tool, a rotary grindstone having a polishing surface on a surface parallel to the blade surface of the cutting tool fixed on the table, and a table for the parallel surface A rotary coating hardening electrode having an electric discharge surface is provided, and the blade surface is polished and the electric discharge coating is hardened while the cutting tool fixed to the table is processed and fed.

[0005]

According to the present invention, as described above, the rotary grindstone having the polishing surface on the surface parallel to the blade surface of the cutting tool fixed to the table, and the rotary coating hardening electrode having the discharge surface on the parallel surface are provided. Since the cutting tool fixed to the table is processed and fed, the blade surface is polished and the discharge coating is hardened, so that the polishing and the discharge coating of the blade surface can be processed at a required angle with extremely high precision and accuracy. Moreover, both machining processes can be performed while the cutting tool is fixed to the table, which facilitates machining.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. In FIG. 1, 1 is a cross table for X and Y cross feed, 2 is an X-axis feed handle, and 3 is a Y-axis feed handle. Reference numeral 4 denotes a drill fixed to the table 1 in the X-axis direction, which is used to polish the tip blade edge 4a and to cure the electric discharge coating. Reference numeral 5 is a rotary grindstone, and 6 is a rotary coating electrode, which is coaxially provided so as to be rotationally driven by a rotary motor 7. The grinding surface 5a of the rotary grindstone 5 is the blade surface 4a of the drill.
Is provided so as to be inclined at a required angle with respect to the rotation axis so that the discharge surface 6a of the rotation covered electrode 6 is also provided at a required angle with respect to the rotation axis so as to be parallel to the blade surface 4a of the drill. ing.

FIG. 2 is a front view of the rotary grindstone 5 and the rotary coating electrode 6. The polishing surface 5a of the rotary grindstone is provided in a trumpet shape from the center, and the rotary coating electrode 6 is discharged on the outer periphery of the grindstone 5 in a concentric circular trumpet shape. The surface 6a is formed. Grinding wheel polishing surface 5a
Is an ordinary grinding stone in which Dia, CBN, Al ₂ O ₃ , B ₄ C, and other abrasive grains are bonded by a bonding material, and the discharge surface 6 a of the rotary coating electrode is WC, TiB ₂ , B ₄ A cemented carbide chip such as C and 8, a metal powder 9 such as Ni, Mn, and C and a binder resin are mixed and used.

In the above, send the cross table 1,
The edge of the fixed drill 4 is brought close to the grindstone 5. When the table 1 is fed to the X-axis by the feed handle 2, the drill 4 approaches the polishing surface 5a of the grindstone, but when it is fed to a predetermined position and then fed to the Y-axis by another handle 3, the drill 4
The blade surface 4a of 1 comes into contact with the polishing surface 5a of the grindstone. At this time, since the polishing surface 5a of the grindstone is provided so as to be parallel to the blade surface 4a of the drill, the blade surface 4a of the drill is brought into close contact with the polishing surface 5a of the grindstone and precision polishing can be performed at a required angle.

Next, when the predetermined polishing is completed, the handle 2
The table 1 is moved back to the x-axis by means of the drill, and stopped when the tip of the drill 4 is positioned on the discharge surface 6a of the electrode 6, and when the Y-axis is fed by the other handle 3, the blade surface 4a of the drill 4 becomes the electrode discharge surface 6a. Contact. The electrode 6 is rotated by a motor 7, and when the blade surface 4a of the drill maintains a light contact state with the discharge surface 6a, the drill 4 and the electrode 6 vibrate in contact and separation, and a pulse power source (not shown). By further energizing, pulse discharge is repeatedly generated. The polarity of energization may be such that the electrode 6 is a positive electrode or a negative electrode, or may be an alternating current, but the discharge point of the electrode 6 is melted by discharge, and the melted material is transferred and welded to the drill 4 side, and this fine welding By the contact vibration of the electrode 6 and the drill 4 and the repetition of the pulse discharge, a minute amount is sequentially welded to the drill blade surface,
A uniform film is formed on the entire surface. The weld coating formed on the drill blade surface 4a is made of a superhard material such as WC for the discharge electrode 6 and has a high hardness and is surface-treated for wear resistance.

As described above, the blade surface 4a of the drill 4 is continuously polished by the rotary grindstone 5 and the discharge coating hardening treatment by the rotary electrode 6, but the grindstone polishing surface 5a and the electrode discharge surface 6a are drilled. Since it is provided in parallel to the blade surface of No. 4, it can be easily positioned and controlled by the X and Y cross feed control of the cross table 1, and the blade surface 4a of the drill has the grindstone polishing surface 5a and the electrode. Highly accurate processing can be performed by always contacting the discharge surface 6a at a predetermined accurate angle.

Further, the processing of the other blade surface 4a with the center axis of the drill 4 as a boundary is performed by feeding the table 1 in the Y-axis feed direction in the opposite direction to the front direction, and thereby similarly performing precision polishing and coating hardening treatment. be able to. Of course, if the drill 4 fixed to the table 1 is rotatably provided, 180 ° of the drill 4
Other blade surfaces can be processed by the same table feed by rotation.

FIG. 3 shows another embodiment in which an electrode having a different structure is used as the coating-hardening electrode 6, and a fiber or wire 11 is used as a metal mixed with a cemented carbide tip to enhance the electrical conductivity, which is provided along the discharge surface. It is a mixture that is wound and mixed. Similarly, a synthetic resin is used for coupling, and the discharge surface 6b is integrally coupled and fixed.
To form. Thermosetting resin is generally used as the binder resin,
It is also effective to use a graphitized conductive material such as PAN. The carbide tip has a diameter of 0.5 to 1, for example.
mmφ, length about 3 mm WC, TiB ₂ , B ₄ C, M
An n-alloy or the like is used alone or as a mixture, and for example, it is mixed with an amide resin at 45 Vol% and bonded to a substrate.

Of course, as shown in the sectional view of FIG. 4, a cemented carbide chip 13 is implanted in a base material 12 of ceramics, resin, metal or the like, and fixed by welding or brazing. As shown in FIG. A metal plate that is mechanically clamped and fixed can be used.

FIG. 6 shows an embodiment in which a rotating disk-shaped grindstone 51 and a rotating disk-shaped covered electrode 61 are provided. An electrode disk 61 is provided around the grinding wheel disk 51 rotated by a motor 7, and the motor 7 To rotate coaxially. The working surface of each of the disks 51, 61 is provided with its rotation axis inclined so as to be parallel to the tip blade surface of the cutting tool 41 that is fixed to the table and is fed, and the table surface is cross-fed to polish and discharge the blade surface. The hardening process is processed by each grindstone 51 and electrode 61.

The rotation of the grindstone disk 51 and the rotation of the electrode disk 61 may be achieved by rotating the grindstones and electrodes arranged side by side by separate motors without rotating them coaxially by the same motor. Rotational speed control etc. can be controlled independently. Further, the polishing surface of the grindstone and the discharge surface of the electrode may be provided on a surface parallel to the blade surface of the cutting tool even if they are not on the same plane. Further, the control of the table for feeding the cutting tool can be automatically controlled by the motor control, and the table can be fed by the Z axis or the rotation in addition to the X and Y axes.

[0016]

As described above, according to the present invention, a rotary grindstone having a polishing surface on a surface parallel to the blade surface of a cutting tool fixed to a table, and a rotary coating hardened electrode having a discharge surface on the parallel surface. Since the cutting tool fixed to the table is processed and fed, the blade surface is ground and the discharge coating hardening treatment is carried out. It is possible to obtain a cutting tool which has a good cutting tool property and is wear-resistant and has a long life. Further, the polishing and the electric discharge coating hardening treatment can be performed at the same time while the cutting tool is fixed on the table, so that the machining treatment of the blade surface can be performed very easily.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a partial front view of FIG.

FIG. 3 is a partial front view of another embodiment of the present invention.

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is a diagram of another embodiment of the present invention.

FIG. 6 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Table 2, 3 Feeding Handle 4 Drill 4a Blade Edge 5 Grinding Stone 5a Polishing Surface 6 Electrode 6a Discharge Surface 7 Motor 8 Carbide Tip 9 Metal

Claims (1)

[Claims] 1. A table for fixing and cutting and feeding a cutting tool, a rotary grindstone having a polishing surface on a surface parallel to the blade surface of the cutting tool fixed on the table, and a discharge surface on the parallel surface. A grinding tool for a cutting tool, wherein a rotary coating hardening electrode is provided, and a cutting tool fixed to the table is processed and fed so that the blade surface is polished and the discharge coating is hardened.