JPH0641090B2 - Mai blade polishing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for polishing a cutting tip such as a flow-away tip, that is, a Mai blade, and more particularly, to a machine tool spindle of a tool holder that clamps the Mai blade. The present invention relates to a high-precision and easy Mai blade polishing method that is not affected by the mounting error of the.

[Prior Art] Conventionally, the blades used for processing machines such as a slicing machine, a machining center, a lathe, and a drilling machine are those that have been ground and finished by a tool maker and are attached to the processing machine spindle of the processing machine. It was clamped at and was used for cutting the work material.

Also, with a milling cutter that clamps and uses multiple blades, it is difficult to accurately align and fix the blades to the cutter body related to the tool holder, so when high precision cutting is required. After all the blades are clamped to the cutter body, each blade edge is corrected and ground, and then the blade is attached to the spindle of the processing machine.

A conventional cutting tool of this type is disclosed in JP-A-51
There is one described in Japanese Patent Laid-Open No. 107580.

[Problems to be Solved by the Invention] In the above-mentioned conventional technique, even if the blade is polished while being clamped on the tool holder, the error that occurs when the tool holder is attached to the machine tool spindle, that is, the tool holder Due to the mounting error of the Mai-blade caused by the gap between the machine and the spindle of the machine, the cutting edge of the Mai-blade swirls in the radial direction and the end face direction during cutting, No consideration was given to the possibility of chatter marks, and there was a problem that excellent cutting surface roughness could not be obtained.

SUMMARY OF THE INVENTION The present invention aims to improve the above-mentioned problems of the prior art and to propose a highly accurate and easy method of polishing a Maih blade, which is not affected by a Maih blade mounting error. Is.

[Means for Solving Problems] In the configuration of the polishing method for a mai blade according to the present invention for solving the above problems, a mai blade having a land portion at a cutting edge ridge of a front flank is used by a tool holder. Clamping, this tool holder is attached to the main shaft of the processing machine, the main shaft is rotated, and the work material mounted and fixed on the table is cut by the above-mentioned Mai blade. In the method, a polishing grindstone is placed on a table, and the Mai blade is held in the same manner as during cutting, while the main spindle of the machine is rotated in the opposite direction to that during cutting, and the land portion of the Mai blade is ground with the grinding stone. The land portion is polished by pressing to.

More specifically, while holding the tool holder with the Mai blade clamped or the cutting body fixed to the machine body as in the cutting process, polish the land of the cutting edge ridge of the front flank of the Mai blade. It is the one.

[Operation] The Mai blade is attached to the processing machine main body in the same way as during cutting, and the land of the cutting edge ridge of the front flank of the Mai blade is corrected and ground. The land portion can be accurately and easily polished without being damaged. Therefore, the land portion can be accurately brought into contact with the cutting surface of the work material, and deterioration of the surface roughness of the cutting surface can be prevented.

[Examples] Before starting the description of the examples, the basic matters according to the present invention will be described with reference to FIGS.

2 to 4 are for explaining the basic time terms according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part in the tool feeding direction showing a cutting state of a work material by a Mai blade. (II in Figure 3
-II arrow cross-section) Fig. 3 is an enlarged cross-sectional view of an essential part in the cutting direction (cross-section taken along the line III-III in Fig. 2), and Fig. 4 is surface roughness and cutting surface roughness of the land portion of the Mai blade. It is a cutting surface roughness characteristic view which shows the relationship of.

FIG. 2 shows a case where the work material 1 is cut by using the rotating blade 2 with a cutting direction perpendicular to the paper surface and feeding the tool to the right side of the paper surface. In this case, the side clearance angle Θ of the dancer 2 and the feed rate of the dancer 2 influence the roughness of the cutting surface. If the feed rate is reduced, good cutting surface roughness can be obtained, but the cutting efficiency decreases. Therefore, it is common to reduce the lateral clearance angle Θ without changing the feed rate.

However, even if the Mai blade 2 having a small side clearance angle Θ is manufactured, if the Mai blade 2 is clamped by the tool holder and mounted on the machine tool spindle, the above-mentioned Mai blade mounting error occurs. There is a limit to the obtained cut surface roughness.

Therefore, in order to further improve the roughness of the cutting surface, another means must be crossed. Generally, from the viewpoint of tool strength, as shown in FIG. 3, the land edge 2 parallel to the cutting direction is very small at the cutting edge ridge of the front flank 2a of the dancer 2.
b is formed. 2c is a rake face.

According to the experiments by the present inventors (Nishiguchi, Masuda: 1988, Preliminary Collection of Seiki Society Autumn Meeting, pp. 523-524),
As shown in the figure, it is known that the better the surface roughness of the land 2b, the better the cutting surface roughness. Based on the result of this experiment, the land portion 2b of the Mai blade 2 was polished while the Mai blade 2 was held on the processing machine in the same manner as during cutting. That is, the same setup method as in the actual cutting work, that is, the Mai blade 2 is clamped by a tool holder, and this tool holder is chucked and chucked on a chuck of a processing machine spindle of a processing machine such as a milling machine or a machining center. A polishing grindstone is placed on the table of the processing machine, and the mai blade 2 is brought into contact with this grinding wheel, and the mai blade 2 is rotated in a direction opposite to the normal use state to grind the mai blade. During polishing, the Mai blade 2 can be
That is, since the rotation in the opposite direction to that in the cutting process is applied, the edge of the cutting edge is ground extremely sharply.

By polishing the Mai blade 2 in this way, it is possible to eliminate the above-mentioned error in fitting the Mai blade, and to secure a very good cutting surface roughness.

Examples will be described below with reference to the drawings.

FIG. 1 is a plan view showing a main part of a processing machine used for carrying out a polishing method for a mai blade according to a first embodiment of the present invention. In FIG. 1, 7 is a processing machine spindle of this processing machine, 4
Is a chuck of the processing machine spindle 7, 6 is a table of the processing machine, 5 is a polishing grindstone mounted and fixed on the table 6, and 3 is a tool holder which clamps the Mai blade 2.
The tool holder 3 is attached to the processing machine spindle 7 via the chuck 4.

A polishing machine for a dancer according to the first embodiment of the present invention will be described using the processing machine configured as described above.

One piece of Mai blade 2, for example, CBN (cubic boron nitride) Mai blade is clamped by a tool holder 3, and this is used as a processing machine spindle 7.
Attach it to the chuck 4. The polishing grindstone 5 is placed and fixed on the table 6 below the tool holder 3. A polishing load, a rotation direction and a rotation speed of a processing machine spindle, and a polishing time are set in a control device (not shown) of the processing machine.

Here, when the processing machine is turned on, the processing model shaft 7 rotates in the direction opposite to that at the time of cutting at the set rotation speed, and the land portion 2b of the Mai blade 2 is pressed against the polishing grindstone 5 with the set polishing load. Then, the land portion 2b is polished by the polishing grindstone 5, and when the set polishing time has elapsed, the polishing is finished and the processing machine is turned off.
become.

According to the above-described embodiment, the polishing blade in which the Mai blade 2 is attached to the processing machine spindle 7 in the same step as in the actual cutting work and the land portion 2b of the Mai blade 2 is placed and fixed on the table 6 5
Since the polishing is performed by the method, there is an effect that it is possible to provide a highly accurate and easy polishing method for the Maih blade, which is not affected by the error in fitting the Maih blade 2.

Another embodiment will be described below.

FIG. 5 is a partial cross-sectional view showing a polishing grindstone unit used for carrying out a polishing method for a Maih blade according to a second embodiment of the present invention. In FIG. 5, 5 is a grinding wheel, 11 is a fixed block, and 10 is a cutting direction (vertical direction in the figure).
A disc-shaped leaf spring according to an elastic body having elasticity, in which a polishing grindstone 5 is fixed to a central portion of the leaf spring 10,
It is fixed to the fixed block 11 at the peripheral portion.

By mounting and fixing the polishing grindstone unit configured as described above on the table 6 instead of the polishing grindstone 5 in FIG.
It is placed on the table 6 with 0 interposed. The polishing method of the Mai blade is exactly the same as that shown in FIG.

In this embodiment, in addition to the effect of the polishing method of the Mai-blade shown in FIG. 1, even if the Mai-blade 2 is slightly changed in cutting depth, it is absorbed by the elastic deformation of the leaf spring 10. There is an advantage that the load can be kept constant and the surface roughness of the land portion of the Maih blade can be polished with higher accuracy.

Even if a coil spring, air pressure, or the like is used instead of the leaf spring 10, the same effect can be obtained.

FIG. 6 is a partial cross-sectional view showing a polishing grindstone unit used for carrying out a polishing method for a Maih blade according to a third embodiment of the present invention. In FIG. 6, 5'is a rotary disk type grinding wheel, 9 is a motor base, and 8 is a motor. The rotary disk type grinding wheel 5'is fixed to the upper end of the motor shaft of the motor 8, and the motor housing part is provided. It is fixed to the motor base 9.

By mounting and fixing the polishing grindstone unit configured as above on the table 6, the rotary disk type grinding grindstone 5 ′ can be rotated on the table 6. During the polishing of the Mai blade, the rotating disk type polishing grindstone 5'is rotated by the motor 8 in the opposite direction of the machine spindle (that is, in the same direction as the rotation direction of the machine spindle during cutting) during the polishing. Meanwhile, the land portion 2b of the Mai blade 2 is polished.

In this embodiment, by rotating the rotary disk type polishing grindstone 5'in the direction opposite to the main shaft of the processing machine, it is possible to prevent one-side slippage of the rotary disk type polishing grindstone 5'and There is an advantage that the surface roughness can be further highly accurately polished and the life of the polishing grindstone 5'can be extended.

FIG. 7 is a front view showing a main part of a processing machine used for carrying out a polishing method for a mai blade according to a fourth embodiment of the present invention. In FIG. 7, the same parts as those in FIG. 1 are designated by the same reference numerals.

In this embodiment, a plurality of dance blades 2 are clamped on a tool holder 3, and even when a plurality of dance blades are clamped in this way, in the same manner as the embodiment according to FIG. 1,
All Mai blades 2 can be polished at the same time, and the same effect can be obtained.

In addition, in each of the above-mentioned embodiments, the case of polishing the Mai blade for finishing the flat surface has been described, but it can be said that the same effect can be obtained by applying the polishing method of the present invention to the Mai blade for finishing the cylindrical surface. There is no end.

[Advantages of the Invention] As described in detail above, according to the present invention, high precision and easy operation that is not affected by the attachment error of the Mai blade,
It is possible to provide a method for polishing Maihado.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of a processing machine used for carrying out a polishing method for a Maito blade according to a first embodiment of the present invention, and FIGS.
The figure is for explaining the basic matters according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part in the tool feeding direction showing the cutting state of the work material by the Mai blade (of FIG. 3). II-II cross section), FIG. 3 is an enlarged cross-sectional view of a main part in the cutting direction (cross section III-III in FIG. 2), and FIG. 4 is the surface roughness and cutting surface of the land portion of the Mai blade. FIG. 5 and FIG. 6 are cutting surface roughness characteristic diagrams showing the relationship with the roughness, and FIG. 5 and FIG. 6 are portions showing a polishing grindstone unit used for carrying out the polishing method of the Mai blade according to the second and third embodiments of the present invention, respectively. A sectional view and FIG. 7 are front views showing a main part of a processing machine used for carrying out a polishing method of a dancer according to a fourth embodiment of the present invention. 1 ... Work material, 2 ... Mai blade, 2a ... Front flank, 2b ...
… Land part, 3 …… Tool holder, 5 …… Grinding wheel, 5 ′
...... Rotary disk type grinding wheel, 6 …… table, 7 …… machining machine spindle, 8 …… motor, 10 …… plate spring.

Claims (3)

[Claims] 1. A front blade flank having a land edge on a cutting edge ridge is clamped by a tool holder, the tool holder is attached to a main spindle of a processing machine, and the main spindle is rotated to be fixed on a table. In the polishing method of the above-mentioned Mai blade in the processing machine configured to perform the cutting work on the cut work material by the Mai blade, a polishing grindstone is placed on the table, and the Mai blade is held in the same manner as during the cutting processing, A method of polishing a mai blade, wherein the land portion of the mai blade is pressed against the polishing grindstone to polish the land portion while rotating the machine spindle in the opposite direction to that during cutting. 2. The method of polishing a blade according to claim 1, wherein a polishing grindstone is placed on the table with an elastic body having elasticity in the cutting direction interposed therebetween. . 3. A method of polishing a blade according to claim 1, wherein the polishing grindstone is rotated on the table in a direction opposite to the spindle of the processing machine.