JPH0141523Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a fine adjustment method that allows the position of the cutting blade to be adjusted, and its installation to be performed without play in adjustment, allowing for accurate and easy positioning. Regarding type cutting tools.

[Conventional technology]

For example, when forming a hole in metal that requires strict dimensional accuracy, a method is adopted in which the rough-machined hole is gradually enlarged in diameter using a cutting tool as shown in FIGS. 7 and 8. This cutting tool has a mounting hole 22 formed at the edge of a tool holder 21, and a tool body 22 having a cutting edge 23 at the tip thereof.
4 is mounted with the cutting blade 23 protruding, and the tool holder 21 is rotated to perform cutting. A holding member 2 is provided at the opening of this mounting hole 22.
5 is fixedly installed, and the tool body 24 is attached to this holding member 25.
An adjustment nut 27 is provided on the outside of the holding member 25 and is screwed onto the outer periphery of the tool body 24. On the other hand, an elastic member (coil spring) 29 is stretched between the inner surface of the holding member 25 and the locking plate 28 at the inner end of the tool body 24, and urges the tool body 24 inward of the mounting hole 22. The adjusting nut 27 is brought into close contact with the outer surface of the holding member 25 to restrict movement of the tool body 24.

Further, a protrusion 30 is provided on the upper surface of the locking plate 28, and a groove 31 is formed in the holding member 25 to fit with the protrusion 30. Due to this fitting, when the adjustment nut 27 is rotated, This prevents the tool body 24 from rotating.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional cutting tools, the anti-rotation mechanism is based on the fitting of the protrusion and the groove, and therefore the tool body cannot be prevented from rotating due to the gap between the fitting. For example, the fifth
FIG. 9 shows the results of measuring the movement of the cutting edge when the adjusting nut 27 is repeatedly rotated by a predetermined angle in the forward and reverse directions as shown in the figure. If the adjusting nut and the tool body rotate together in this manner, the tool body will not move in the axial direction even if the adjusting nut is rotated, resulting in so-called play. Furthermore, the amount of rotation of the adjusting nut 27 and the amount of axial movement of the tool body do not correspond, and therefore, each measurement must be performed in order to accurately position the tool. Moreover, the adjustment work becomes a work that requires intuition and skill. In order to eliminate such play, it is possible to reduce the fitting tolerance, but this requires sophisticated control of dimensional accuracy during manufacturing, making manufacturing difficult and increasing costs.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a tool holder in which a mounting hole is formed, a holding member fixed to the tool holder covering the mounting hole, and a cutout at the outer end. A tool body having a blade attached thereto and mounted in the mounting hole with the cutting edge protruding from the insertion hole of the holding member, and an adjustment nut that is in contact with the outer surface of the holding member and screwed onto the outer periphery of the tool body. and an elastic member stretched between the holding member and the tool body to bias the tool body inward of the mounting hole, and between the elastic member and the holding member, the tool body At least two or more anti-rotation members are provided in sliding contact with the outer wall of the tool body to prevent rotation of the tool body, and the opposing surfaces of the anti-rotation members and the holding member are tapered surfaces that widen toward the inside of the mounting hole. V-shaped grooves extending along the tapered surfaces are formed at mutually opposing positions on the opposing surfaces, and a cylindrical roller member is sandwiched between the pair of opposing V-shaped grooves.

[Effect]

In such fine-adjustment cutting tools, the reaction force of the elastic member is divided by the tapered surface between the holding member and the detent member, and the detent member is pressed against the tool body by force in the direction perpendicular to the axis. At the same time, by inserting the roller member into the V-shaped groove formed in the detent member and the holding member, rotation of the detent member with respect to the holding member is restricted. Therefore, while the tool body is movable in the axial direction relative to the holding member, rotation in the circumferential direction is strictly regulated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a tool holder formed in a disk shape, 2 a mounting hole formed obliquely on the edge thereof, 3 a holding member fixedly installed to cover the mounting hole 2, 4 is a tool body with a cutting blade 5 attached to its outer end; 6 is an adjustment nut 7 provided on the outside of the holding member 3 and screwed onto the outer periphery of the tool body 4; An elastic member (ring-shaped leaf spring) is stretched between the locking plate 8 at the inner end of the main body 4, and 9 indicates two detents provided between the elastic member 7 and the holding member 3. It is a member.

The holding member 3 is welded and fixed to the opening of the mounting hole 2, and the adjustment nut 6 is attached to the outer surface of the holding member 3.
A recess 10 is formed into which the tool body 4 is rotatably fitted, and an insertion hole 11 into which the tool body 4 is inserted is formed in the center.

The tool main body 4 has a mounting portion 4a for a cutting blade (throw-away tip) 5 formed at its outer end, and a locking plate 8 fixedly attached to its inner end by bolts 12. The main shaft portion 4b of the tool body 4 has a cylindrical shape, and a male screw portion 13 into which the adjustment nut 6 is screwed is formed on the outer periphery of the outer end thereof, and a pair of parallel surfaces on the inner end portion. 14, 14 are formed.

As shown in FIGS. 2 and 3, the anti-rotation member 9 has a shape in which the central part of a cone is cut out with a parallel plane including the axis, and its inner surface 9a is slidable on the parallel plane 14 of the tool body 4. A pair are arranged on both sides of the tool body 4 so as to be in contact with each other.

The lower surface 3a of the holding member 3 is formed into a conical shape corresponding to the upper surface 9b of the rotation preventing member 9. A V-shaped groove 15 extending in the ridgeline direction is formed on the upper surface 9b, and a V-shaped groove 16 is similarly formed at an opposing position on the lower surface 3a. A cylindrical roller member 17 is sandwiched between them.

The angle of the cross section of these V-shaped grooves 15 and 16 is such that when the adjusting nut 6 is rotated, the roller member 1 resists the force acting between the upper surface 9b and the lower surface 3a in the direction of displacement.
A value that maintains 7 is required and is set in the range of 60 to 150 degrees. Further, the diameter of the roller member 17 is set so that the opposing surfaces 9b and 3a do not touch each other, as shown in FIG.

The roller member 17 and the V-shaped grooves 15, 16 have good dimensional accuracy and have smooth surfaces, and the parallel surfaces 14, 14 of the tool body 4 and the inner surfaces 9a, 9b of the detent member 9 can also slide smoothly. is formed.

Next, the operation of the fine adjustment type cutting tool configured as described above will be described.

Due to the action of the elastic member 7, the tool body 4 is biased inward of the mounting hole 2, so the adjustment nut 6
is always press-fitted to the holding member 3. Therefore, by rotating the adjustment nut 6, the male threaded portion 13
The tool body 4 is moved in its axial direction by a length corresponding to the pitch.

In this case, a rotational moment is applied to the tool body 4 around the axis, but the parallel surfaces 14, 14 of the tool body 4 are held down by two anti-rotation members 9, 9, 9 is a roller member 17 inserted into the V-shaped grooves 15 and 16, respectively.
Rotation relative to the holding member 3 is suppressed by this action. Therefore, the tool body 4 does not rotate relative to the holding member 3 and the tool holder 1.
The adjustment nut 6 does not rotate when it is rotated. In the present invention, instead of the conventional gap fitting, a detent member 9 having a tapered surface is arranged,
The contact surface between the holding member 3 and the tool body 4 is crimped, but the biasing force for this is made using the elastic member 7 for fixing the tool body 4 in the axial direction, so there is no need to newly provide it. , the biasing force does not need to be particularly strengthened for the anti-rotation effect.

In addition, the apex angle θ of the rotation prevention member 9 (see Fig. 3)
As the angle increases, the pressure between the contact surfaces of the detent member 9 and the tool body 4 increases, while the force that clamps the roller member 17 decreases, so it is necessary to set the angle to balance both. According to the inventors' experience, 20
A sufficient effect can be obtained within the range of ~75 degrees.

In order to confirm the positioning accuracy of the cutting tool of the present invention, a test was conducted using the method shown in FIG. 5 described above, and as shown in FIG. 6, there was almost no runout. In this way, twisting is prevented, so
There is no play in the adjusting nut 6, and the amount of rotation thereof corresponds to the amount of movement of the tool body 4. Therefore, adjusting nut 6
If a scale 6a is attached to the scale 6, the necessary adjustment amount
It can be obtained from a.

Therefore, the adjustment work becomes easy and there is no need to measure the position for confirmation, which improves work efficiency. Moreover, the work does not require skill or intuition.

Furthermore, instead of fitting with a gap, the V-shaped groove 15,
However, since the anti-rotation member 9 is positioned by the line contact of the member 17, the machining accuracy at the time of manufacture is relatively low, and therefore the cost is low and compatibility is high.

[Effect of idea]

As detailed above, the present invention includes a tool holder in which a mounting hole is formed, a holding member fixed to the tool holder covering the mounting hole, and a cutting blade attached to the outer end. a tool body mounted in the mounting hole with its cutting edge protruding from the insertion hole of the holding member; an adjustment nut that is in contact with the outer surface of the holding member and screwed onto the outer periphery of the tool body; and the holding member and an elastic member stretched between the tool body and the tool body to urge the tool body inward of the mounting hole, and an elastic member that slides into contact with the outer wall of the tool body between the elastic member and the holding member. , at least two or more anti-rotation members are provided to prevent rotation of the tool body, and opposing surfaces of the anti-rotation members and the holding member are formed into tapered surfaces that widen toward the inside of the mounting hole; V-shaped grooves extending along the tapered surface are formed at mutually opposing positions on the surface, and the pair of opposing V-grooves
Since the cylindrical roller member is sandwiched between the grooves, the tool body is held by the holding member via the rotation preventing member with rotation in the circumferential direction strictly regulated. Therefore, when the adjusting nut rotates, the tool body does not rotate together, and the tool body can be moved in the axial direction without any play in the adjusting nut. As a result, the amount of movement of the tool body corresponds to the amount of rotation of the adjustment nut, making it possible to accurately and easily adjust the position of the cutting edge, eliminating the need for measuring work or tools for confirmation, and improving work efficiency. The process improves, and the work does not require skill or intuition. Further, the dimensional accuracy of the tool member may be relatively loose, reducing costs and providing high compatibility with other tools. Furthermore, in order to produce the above-mentioned effects, there is no need to newly provide an elastic member, and the structure does not become complicated.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of an embodiment of the present invention.
Figure 2 is a view in the - arrow direction of Figure 1, Figure 3 is an enlarged view of the main part of Figure 1, Figure 4 is a view in the - arrow direction of Figure 3, and Figure 5 is a tool accuracy test method. FIG. 6 is a graph showing the run-out of the cutting edge of the embodiment of the present invention in the method of FIG. 5, FIG. 7 is a sectional view of the main part of the conventional example, and FIG. The arrow view and FIG. 9 are graphs showing the test results of the conventional example. DESCRIPTION OF SYMBOLS 1... Tool holder, 2... Mounting hole, 3... Holding member, 3a... Lower surface, 4... Tool body, 5... Cutting blade, 6... Adjustment nut, 7... Elastic member, 9... …
Anti-rotation member, 9b...Top surface, 11...Insertion hole, 1
5, 16... V-shaped groove, 17... Roller member.

Claims (1)

[Scope of Claim for Utility Model Registration] A tool holder having a mounting hole formed therein, a holding member fixed to the tool holder covering the mounting hole, and a cutting blade attached to the outer end thereof. a tool body installed in the mounting hole with a blade protruding from the insertion hole of the holding member; an adjustment nut that is in contact with the outer surface of the holding member and screwed onto the outer periphery of the tool body; an elastic member stretched between the member and the tool body to urge the tool body inwardly into the mounting hole; At least two anti-rotation members are provided that come into sliding contact and prevent rotation of the tool body, and opposing surfaces of the anti-rotation members and the holding member are formed into tapered surfaces that widen toward the inside of the mounting hole. , V-shaped grooves extending along the tapered surfaces are formed at mutually opposing positions on the opposing surfaces, and a cylindrical roller member is inserted into the pair of opposing V-shaped grooves. Cutting tools.