JP4734698B2 - Mounting structure of tool bar to tool block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for attaching a plate tool to a tool block.
[0002]
[Prior art]
As is well known, a plate bite is used when performing precise grooving (for example, cutting of a ring groove of a piston). In addition, the plate bite is used by being attached to the tool block. This attachment is fixed to the tool block by a clamping force after being fitted in the concave portion in the longitudinal direction of the tool block .
[0003]
[Problems to be solved by the invention]
Therefore , the plate bite is formed with a very small reverse taper in the width direction of the tip part (tapered toward the base opposite to the tip part), and the posture of the plate bite is the progress of the plate bite If they do not coincide with the direction, the side surface of the plate tool comes into contact with the part to be cut more than necessary, and there is a problem that the cutting accuracy is lowered and the life of the plate tool itself is reduced.
[0004]
In addition, a part of the tool block is deformed by the clamping force for mounting the plate bite, and this causes a slight change in the posture of the plate bite, affecting the cutting accuracy.
[0005]
Therefore, the present invention has a technical problem of maintaining and stabilizing the cutting accuracy when cutting with a plate tool.
[0006]
[Means for Solving the Problems]
Technical measures taken to solve the above technical problems are:
In the structure for attaching the cutting tool having a reverse taper surface on both side surfaces and a cutting tool for cutting, and a base tool for supporting the cutting tool to the tool block,
The reverse taper surface of the cutting portion is continuous with a first reverse taper surface having an inclination angle θ1 with respect to the base and a second reverse taper surface having an inclination angle θ2 that is larger than the first reverse taper surface. Have
The plate bite has two long holes in the base, and in the state where the plate bite is sandwiched by liners from both sides of the base , two bolts pass through the liner with respect to each of the long holes. The liner is fixed to the tool block by being inserted .
[0008]
In the above configuration, the following may be adopted.
[0009]
That is, the first reverse taper surface and the second reverse taper surface may change the inclination angle at a predetermined position from the tip portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Specific examples of the present invention will be described with reference to the accompanying drawings.
[0011]
1 and 2, a tool holder or tool block 10 has a stepped portion 12 formed along the longitudinal direction. A plate bit 20 sandwiched between a pair of liners 14 is formed on the stepped portion 12. A pair of bolts 30 are fixed to the side surface of the shoulder 10 a of the tool block 10. A washer 18 is interposed between the head of the bolt 30 and the liner 14.
[0012]
In the mounting structure described above, the stress generated by the tightening force of the bolt 30 acts substantially equally on the shoulder 10a of the tool block 10, so that the position and posture of the plate bite 20 accompanying local deformation of the shoulder 10a. As a result, there is no drop in cutting accuracy due to this.
[0013]
3 to 5 are views showing the plate cutting tool 20 , FIG. 3 is a side view of the plate cutting tool 20 , FIG. 4 is a front view, and FIG. 5 is an enlarged view of a portion A in FIG. As shown in FIG. 3, the plate bite 20 in this example has a full length L and a height H. As shown in FIGS. 4 and 5, the tip portion 22 of the plate bite 20 has a first side surface 22a, a second side surface 22b, a cutting portion 22c, and a base portion 22d, and is shown by the left end side in FIG. By cutting the workpiece (not shown but located on the left side of the cutting portion 22c in FIGS. 4 and 5) with the cutting portion 22c, the workpiece is grooved. The plate byte 20 is formed in a reverse tape tapered surface of angle which the front end portion 22 is different in the direction of the width W. That is, as shown in FIG. 5, the first side surface 22a has a width W from the cutting portion 22c to the predetermined position A toward the base portion 22d with respect to the length axis direction (the axial direction of the total length L). (Reverse taper angle) The first reverse taper surface that gradually narrows at θ1 and the width W from a predetermined position A to the base portion 22d is an angle (reverse taper) with respect to the longitudinal axis direction (the axial direction of the total length L). (Angle) having a second reverse tapered surface that gradually becomes narrower at θ2. Thus, since the inclination angle θ1 is set smaller than the inclination angle θ2 , even if the plate bit 20 is vibrated or curved greatly, the second side surface 22b of the tip 22 of the plate bit 20 is processed by the workpiece. Interference with the surface is eliminated, and the groove shape accuracy is stabilized. Further, the wear of the second side surface 22b of the tip portion 22 of the plate tool 20 is also reduced.
[0014]
In addition, as shown in FIG. 3, if the bolt insertion hole 24 of the plate cutting tool 20 is a long hole, the protruding amount of the plate cutting tool 20 can be adjusted.
[0015]
Although specific examples of the present invention have been described above, the present invention is not intended to be limited to the specific examples described above, and any method / apparatus according to the gist of the present invention may be used.
[0016]
【The invention's effect】
As described above, in the plate-byte, it is formed by reverse tapered surfaces of both ends different angles of the tip, one of the reverse taper angle of the cutting portion (.theta.1), from the inverse taper angle of the base side (.theta.2) Since the side surface (second side surface 22b) having the larger angle (θ2) does not interfere with the processing surface of the workpiece, the processing accuracy is improved and stabilized.
[0017]
In the present invention, the tool bit is screwed to the longitudinal side surface of the tool block, and the tool bit is attached to the tool block via the liner , so that the tightening torque acts uniformly on the longitudinal side surface of the tool block. However, the processing accuracy is not deteriorated due to the position deviation / posture deviation of the tool bit due to the local deformation of the tool block.
[Brief description of the drawings]
FIG. 1 is a plan view showing a structure for attaching a plate tool of the present invention to a tool block.
FIG. 2 is a side view of the structure shown in FIG.
FIG. 3 is a side view of a plate tool of the present invention.
4 is a plan view of the plate tool shown in FIG. 3. FIG.
FIG. 5 is an enlarged view of a part A in FIG.
[Explanation of symbols]
10: Tool block 20: Plate bit 22: Tip end 22a of plate bit: First side, 22b: Second side, 22c: Cutting portion , 22d: Base A: Predetermined position

Claims (1)

In the structure for attaching the cutting tool having a reverse taper surface on both side surfaces and a cutting tool for cutting, and a base tool for supporting the cutting tool to the tool block,
The reverse taper surface of the cutting portion is continuous with a first reverse taper surface having an inclination angle θ1 with respect to the base and a second reverse taper surface having an inclination angle θ2 that is larger than the first reverse taper surface. Have
The plate bite has two long holes in the base, and in the state where the plate bite is sandwiched by liners from both sides of the base , two bolts pass through the liner with respect to each of the long holes. A structure for attaching a cutting tool to a tool block, wherein the structure is inserted and the liner is fixed to the tool block.

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