JP3271334B2 - Ceramic cutting tool grinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding device for a ceramic cutting tool used for cutting a difficult-to-cut material.

[0002]

2. Description of the Related Art In general, a cutting tool made of cemented carbide is used in a lathe or the like. However, a cutting tool made of cemented carbide cannot cut hard-to-cut materials such as inconel material at a high speed. SiC (silicon carbide) for machined materials
A ceramic cutting tip containing whiskers, that is, a ceramic cutting tool is used.

[0003] The ceramic cutting tool is shown in Figs.
As shown in FIG. 0, the conical surface 2 of the inverted cone 1 is cut into a V-shape to form a tool body 4 having a V-groove receiving surface 3 at a cut portion, and an end face 5 of the tool body 4 is formed. Two positions corresponding to both ends of the corner line 7 in the V-groove receiving surface 3 on the boundary line 6 between the cutting surface 8 and the conical surface 2 are defined as the cutting portions 8.

Then, the V-groove receiving surface 3 of the tool main body 4 is set in the V-groove 10 of the holder 9 shown in FIG. 11, and the end surface 5 of the tool main body 4 is pressed and fixed by a pressing member 11, and The holder 9 is mounted on a turret 12 of a lathe as shown in FIG. 12 and is used for cutting the inner peripheral surface of a cylindrical member 15 made of a difficult-to-cut material, which is held by a clamp 14 on a rotary table 13.

Since the tool body 4 is provided with two cutting portions 8, if one of the cutting portions 8 is worn, the tool body 4 is turned over by 180 degrees and reset on the holder 9, and the other cutting portion 8 is set. 8 is used.

[0006]

However, the above-mentioned conventional ceramic cutting tools have the following problems.

That is, a ceramic cutting tool has a durable limit when two cutting portions 8 are worn, but when cutting hard-to-cut materials, one cutting portion 8 wears out in 3 to 5 minutes. Therefore, a large amount of ceramic cutting tools are consumed, and tens of thousands of ceramic cutting tools are thrown away in a year.

However, since ceramic cutting tools are very expensive compared to cemented carbide cutting tools, it is wasteful to dispose of tens of thousands of ceramic cutting tools per year at the same time as processing products. This also caused the cost to increase.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a ceramic cutting tool grinding apparatus which can be reused even when the ceramic cutting tool has exceeded its service life. is there.

[0010]

According to the present invention, there is provided a grinding apparatus for a ceramic cutting tool according to the present invention, comprising a receiving rod disposed rotatably by a grinding apparatus main body, and an end support rod concentrically rotating with the receiving rod. A ceramic cutting tool grinding device for holding a ceramic cutting tool, wherein the ceramic cutting tool cuts a conical surface of a cone into a V shape and has a V-groove receiving surface at a cut portion. Formed, two positions corresponding to both ends of the corner line on the V-groove receiving surface on the boundary line between the end surface and the conical surface of the tool body as cutting surfaces, and at the center of the corner line of the V-groove receiving surface Forming a positioning recess extending in a direction perpendicular to the corner line, wherein the receiving rod has a V-groove which can be fitted to a V-groove receiving surface of the ceramic cutting tool, and the ceramic-made ceramic inside the V-groove. For positioning of cutting tools A positioning projection that can be fitted to the portion is provided, and the end surface support rod has a support surface that can abut against an end surface of the ceramic cutting tool at an end facing the V groove of the receiving rod, The position adjusting arm freely moves along a guide provided on the grinding device main body, moves toward and away from the receiving rod, and rotates synchronously with the receiving rod by a synchronous drive shaft disposed on the grinding device main body. It is composed.

[0011]

The operation of the present invention is as follows.

In a ceramic cutting tool used for a grinding machine for a ceramic cutting tool, a positioning recess extending in a direction perpendicular to the corner line is formed at the center of the corner line of the V-groove receiving surface of the tool body. In addition, centering during polishing can be easily and accurately performed.

In the ceramic cutting tool grinding device, a V-groove receiving surface formed on the tool body is fitted into the V-groove of the receiving rod such that the positioning concave portion and the positioning convex portion match. Positioning and centering of both, the receiving rod and the end surface support rod are brought close by the grinding device main body and position adjustment arm, and the end surface of the ceramic cutting tool tool body is supported by the support surface of the end surface support rod, and easily. The tool body can be fixed so as not to rotate eccentrically. Further, the receiving rod and the end surface support rod can be synchronously rotated by the synchronous drive shaft.

Therefore, when the tool body is fixed, the receiving rod and the end face support rod are synchronously rotated to apply the grindstone, so that the tool body can be polished and reused even when the tool body exceeds the durable limit. This eliminates the need to dispose of expensive ceramic cutting tools, reduces the machining cost for difficult-to-cut materials, and is expensive and is used only for grinding difficult-to-cut materials. This makes it possible to reuse a ceramic cutting tool that has not been used, and open the way of application to materials other than difficult-to-cut materials.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention.

8 to 10, the conical surface 2 of the inverted cone 1 is cut into a V-shape to form a tool body 4 having a V-groove receiving surface 3 at a cut portion. A ceramic cutting tool is formed as a cutting portion 8 at two positions on a boundary 6 between the end surface 5 of the main body 4 and the conical surface 2 and corresponding to both ends of the corner line 7 on the V-groove receiving surface 3.

As shown in FIGS. 1 to 3, the corner line 7 of the V-groove receiving surface 3 in the ceramic cutting tool is used.
Is formed at the center portion of the positioning recess 16 extending in a direction perpendicular to the corner line 7.

Also, as shown in FIG.
And a position adjusting arm 19 movable along a guide 18 provided on the grinding device main body 17, and a longitudinal direction 2 of the guide 18 is provided between the grinding device main body 17 and the position adjusting arm 19.
A synchronous drive shaft 22 which extends to 0 and is extendable and retractable by a spline fitting portion 21 is disposed therethrough, and sheaves 23 and 24 are attached to both ends of the synchronous drive shaft 22.

Further, as shown in FIGS. 5 to 7, a receiving rod 2 extending in the longitudinal direction 20 and having a V-groove 25 at the tip end capable of being fitted to a V-groove receiving surface of a ceramic cutting tool.
6, the receiving rod 26 is axially rotatably inserted through the grinding device main body 17, and the positioning rod 16 can be fitted into the V-shaped groove 25 of the receiving rod 26 in the positioning recess 16 of the ceramic cutting tool. The projection 27 is provided.

The support surface 28 which can be brought into contact with the end face of the ceramic cutting tool is provided with the V-groove 2 of the receiving rod 26.
An end surface support rod 29 is provided at a distal end portion facing the end support 5, and the end surface support rod 29 is disposed through the position adjusting arm 19 so as to be rotatable concentrically with the receiving rod 26. So that they can approach and separate from each other.

Receiving rod 26 and end face support rod 29
The sheaves 30 and 31 are respectively attached to the rear end portions, and endless belts 32 and 33 are respectively suspended between the respective sheaves 30 and 31 and the corresponding sheaves 23 and 24 at both ends of the synchronous drive shaft 22, respectively. The rotation of the drive shaft 22 causes the receiving rod 26 and the end surface support rod 29 to rotate synchronously.

Further, another sheave 34 is attached to the rear end of the receiving rod 26, and an endless belt 35 which is moved by a drive source (not shown) is wound around the sheave 34.

Reference numeral 36 denotes a disk-shaped grinding stone having a diamond layer 38 formed on the flange 37.

Next, the operation will be described.

The process of cutting a difficult-to-cut material by setting a ceramic cutting tool on a lathe is the same as in FIGS. 11 and 12, and a description thereof will be omitted.

According to the present invention, when the ceramic cutting tool exceeds the service life limit, the cutting tool is polished as follows to reduce the size and make it reusable.

That is, the position adjusting arm 19 is moved along the guide 18 in the direction in which the synchronous drive shaft 22 extends, and the distance between the receiving rod 26 and the end surface support rod 29 is separated.

In this state, the V-groove 25 of the receiving rod 26
The V-groove receiving surface 3 formed on the tool body 4 of the ceramic cutting tool is fitted so that the positioning concave portion 16 and the positioning convex portion 27 coincide with each other to perform positioning and centering of the two. By moving the position adjusting arm 19 along the guide 18 in the direction in which the synchronous drive shaft 22 contracts, the receiving rod 2 is moved.
6 and the end face support rod 29 are brought close to each other, the end face 5 of the tool body 4 of the ceramic cutting tool is supported by the support surface 28 of the end face support rod 29, and the position of the position adjustment arm 19 is fixed by a bolt (not shown) or the like.

When the ceramic cutting tool is held between the receiving rod 26 and the end surface support rod 29 in this manner, the endless belt 35 is moved by a driving source (not shown) to rotate the receiving rod 26. The end surface support rod 29 is synchronously rotated via the sheave 30, the belt 32, the sheave 23, the synchronous drive shaft 22, the sheave 24, the belt 33, and the sheave 31, and the ceramic cutting tool is rotated at a high speed.

When the ceramic cutting tool is rotated at a high speed, the conical surface 2 of the tool body 4 of the ceramic cutting tool is rotated.
Then, the diamond layer 38 formed on the flange 37 portion of the disc-shaped grindstone 36 is applied to the surface, and the tool body 4 of the ceramic cutting tool is polished to reduce the size.

Here, a ceramic cutting tool without the positioning recess 16 is used (a receiving rod 26 without the positioning projection 27).
When the ceramic cutting tool is very hard, the ceramic cutting tool causes only a small eccentric rotation, and the contact between the ceramic cutting tool and the grindstone 36 occurs. In contrast to the unevenness, the grindstone 36 is instantaneously worn and it becomes impossible to grind the ceramic cutting tool. On the other hand, according to the present invention, the V-groove receiving surface 3 in the tool body 4 of the ceramic cutting tool is used. By forming the positioning recess 16 in advance, the ceramic cutting tool can be easily and accurately centered, and even if the ceramic cutting tool is rotated at a high speed for polishing, the ceramic cutting tool can be formed. The eccentric rotation of the tool is prevented, and the tool body 4 can be polished by applying the grindstone 36 stably and uniformly.

Therefore, the conventional ceramic cutting tool shown in FIGS. 8 to 10 cannot be polished.
The ceramic cutting tool of the present invention can be easily polished and reused.

Further, it is not necessary to dispose of an expensive ceramic cutting tool as a disposable one, and it is possible to reduce a machining cost for a difficult-to-cut material.

Further, it is possible to reuse a ceramic cutting tool which has been used only for grinding hard-to-cut materials due to its high cost, and to open the way of application to materials other than hard-to-cut materials. Can be.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0037]

As described above, according to the ceramic cutting tool grinding apparatus of the present invention, even if the tool body exceeds the service life limit, it can be polished and reused, and the expensive ceramic cutting tool can be used. A ceramic cutting tool that has been used only for grinding difficult-to-cut materials due to the high cost, as well as the fact that tools are no longer disposable and the machining cost for difficult-to-cut materials can be reduced. Can be reused, and it is possible to obtain an excellent effect of opening the way of application to materials other than difficult-to-cut materials.

[Brief description of the drawings]

FIG. 1 is a front view of a ceramic cutting tool according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a plan view of a grinding device for a ceramic cutting tool.

FIG. 5 is a diagram showing a state in which a ceramic cutting tool is set between a receiving rod and an end surface support rod.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a view taken along the line VII-VII in FIG. 5;

FIG. 8 is a front view of a conventional example.

FIG. 9 is a view as viewed in the direction of arrows IX-IX in FIG. 8;

FIG. 10 is a perspective view of FIG. 8;

FIG. 11 is a perspective view showing a state where FIG. 8 is set in a holder.

FIG. 12 is a side sectional view showing a state of cutting a difficult-to-cut material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conical body 2 Conical surface 3 V-groove receiving surface 4 Tool main body 5 End surface 6 Boundary line 7 Corner line 8 Cutting surface 16 Positioning concave portion 17 Grinding device main body 19 Position adjustment arm 22 Synchronous drive shaft 25 V-groove 26 Receiving rod 27 Position Protrusion 28 Support surface 29 End support rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B24B 3/34 B23B 27/16

Claims (1)

(57) [Claims] 1. A ceramic cutting tool grinding device for holding a ceramic cutting tool between a receiving rod disposed rotatably by a grinding device main body and an end surface support rod concentrically rotating with the receiving rod. The ceramic cutting tool cuts the conical surface of the cone into a V-shape to form a tool body having a V-groove receiving surface at a cut portion, and on a boundary line between the end surface and the conical surface of the tool body. And two positions corresponding to both ends of the corner line on the V-groove receiving surface are defined as cutting surfaces, and at the center of the corner line of the V-groove receiving surface,
Forming a positioning recess extending in a direction perpendicular to the corner line, wherein the receiving rod has a V in the ceramic cutting tool;
The groove receiving surface has a V-groove that can be fitted therein, and a positioning convex portion that can be fitted into a positioning concave portion of the ceramic cutting tool is provided inside the V-groove. The rod has a support surface at an end facing the V-shaped groove, which can abut against an end surface of the ceramic cutting tool, and the position adjustment arm is freely moved along a guide provided on the grinding device main body. A grinding device for a ceramic cutting tool, wherein the grinding device is configured to move close to and away from a receiving rod, and to rotate synchronously with the receiving rod by a synchronous drive shaft arranged in the grinding device main body.