JP2003117725A - Throwaway reamer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the change of a reamer diameter when making a back taper adjustment in providing a throwaway reamer with a fine adjustment mechanism for the reamer diameter and back taper. SOLUTION: A receiving part 7 counterbored in sector shape is formed at the tip part of a reamer body 2 to enclose a presser piece 6 therein, and a cutting edge tip 5 is formed to be pressure-fixed by clamping the presser piece 6 by a clamp screw 14. The push-out quantity in the outer peripheral direction of the cutting edge tip 5 is determined by an adjusting screw 17. The back face 12 of the presser piece 6 and the sector face of the receiving part 7 are formed as circular curved faces of the same radius R around the outermost diameter point P of a reamer diameter to allow micro rotary movement, and the movement is locked by a locking screw 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type reamer capable of finely adjusting a reamer diameter and a back taper.

[0002]

2. Description of the Related Art When trying to realize a reamer tool used for finishing a hole with a throw-away type tool,
Fine adjustment of the reamer diameter and back taper may be necessary. Japanese Patent Application Laid-Open No. 52-122986 and Japanese Patent Application Laid-Open No. 9-11039 disclose a device having a fine adjustment mechanism. In these, the long side of a rectangular flat plate-shaped cutting edge tip is used as an outer peripheral cutting edge, and the two adjusting screws arranged on the front end side and the rear end side of the reamer are brought into contact with the side surfaces of the cutting edge tip to adjust the adjusting screw. The reamer diameter and the back taper are adjusted by the amount of extrusion of. The adjusted cutting edge tip is clamped and fixed to the reamer body with a pressing piece and a tightening screw.

The cutting edge tip in such a throwaway reamer is first adjusted to a predetermined reamer diameter by an adjusting screw provided at a position close to the tip of the tool, and then by an adjusting screw provided at the rear end. A method of adjusting the back taper is adopted.

[0004]

The problem with the conventional adjusting mechanism as described above is that the reamer diameter adjusted before the back taper changes at the same time as the back taper is adjusted. It means that it costs.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention of claim 1 is the outermost part for determining the reamer diameter at the tip of the reamer body. It is provided with a receiving part that is dented in a fan shape around the radial point, and is provided with locking means for restraining the rotational movement of the cutting blade mounted on this receiving part, and pushes out this cutting blade in the outer peripheral direction. It is characterized in that it is equipped with an adjusting means that can do this.

The reamer diameter is determined by the pushing amount of the cutting blade in the outer peripheral direction. The amount of extrusion is determined by the adjusting means. On the other hand, the back taper is determined by the stationary position of the cutting blade in the rotational direction. To decide this stationary position is
It is a locking means. At this time, the cutting blade is adapted to rotate around the outermost radial point of the reamer diameter, and therefore the position of the outermost radial point does not change due to the adjustment of the back taper.

According to a second aspect of the present invention, the cutting blade body is composed of a cutting blade tip and a pressing piece, and the back surface of the pressing piece is formed in a circular curved surface so as to come into contact with the fan-shaped surface of the receiving portion. Characterize. This is a specific example when the cutting blade tip and the pressing piece are integrally adjusted, and the pressing piece moves while maintaining the position of the outermost radial point of the reamer.

According to a third aspect of the present invention, an adjusting screw is incorporated in the pressing piece. This adjustment screw is an adjustment means that determines the amount of extrusion in the outer peripheral direction,
In particular, it is a means that can be realized even in a throwaway reamer having a small reamer diameter.

According to a fourth aspect of the present invention, a V groove is formed on the upper surface of the cutting blade tip, and the tip of the pressing piece presses the inclined surface of the V groove to fix the cutting blade tip. Even in the present invention in which the cutting blade body is rotated and moved, such a structure provides a pulling action and a pressing action to the cutting blade tip at the same time, and thus is an accurate and strong clamp.

According to a fifth aspect of the present invention, the cutting blade body is composed of a single cutting blade tip whose one side surface is formed into a circular curved surface, and a cartridge having the receiving portion is incorporated in the reamer body. It is characterized in that it is placed so that a circular curved surface abuts on the fan-shaped surface of the cartridge and fixed by screws. This is done by moving the reamer diameter cartridge.
The back taper is a specific example in which it is adjusted by the rotational movement of the cutting blade tip itself.

A sixth aspect of the present invention is characterized in that the cartridge is pushed out in the outer peripheral direction by a wedge piece attached to the back surface of the cartridge. The reamer is suitable for a reamer having a relatively large diameter, and the reamer diameter is adjusted by a wedge piece incorporated using a space with a sufficient margin, so that the movement in the outer peripheral direction can be made uniform.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show a throw-away type reamer 1 according to claims 1 to 4. At the tip of the reamer body 2 in the shape of a round bar,
A blade runout check ring 3 which is a standard for measuring the mounting accuracy of the cutting blade is provided in a protruding manner. Further, guide pads 4 are arranged at a predetermined interval on the outer periphery of the tip end portion so as to come into contact with the processed hole and suppress the vibration and vibration of the cutting edge during cutting.

As shown in FIG. 2, the cutting blade is a cutting blade tip 5.
And a pressing piece 6. Reamer body 2
In the tip corner portion of the cutting edge, there is formed a fan-shaped receiving portion 7 having a radius R centering on the outermost radial point P on the cutting edge tip 5 that determines the reamer diameter. The body is placed. As shown in FIG. 3, the cutting blade tip 5 has a substantially rectangular flat plate shape and a substantially parallelogram cross section.
A chamfering blade 10 acting as a biting angle is obliquely provided at the intersection of the front cutting edge 8 and the outer peripheral cutting edge 9. The outermost diameter point P is
The point of intersection of the chamfering blade 10 and the outer peripheral cutting edge 9 is reached. V-grooves 11 are provided on the upper surface of the chip in parallel with the long sides.

FIG. 4 shows the details of the pressing piece 6, the rear surface 12 of which is the same radius R as the fan-shaped radius R of the receiving portion 7.
Is formed into a circular curved surface. Further, a stepped half-hole shaped fastening groove 13 is provided in the middle of the back surface 12. The pressing piece 6 has a head jaw of a button head type tightening screw 14 that engages with the tightening groove 13 so that the countersink surface 15 of the tightening groove 13 is formed.
It is clamped and fixed by pressing. Between the tightening groove 13 and the tightening screw 14, there is a clearance that allows fine adjustment.

In front of the pressing piece 6, a pressing piece tip 16 is provided.
Is projected. By tightening the tightening screw 14, the inclined surface of the V groove 11 provided on the cutting edge tip 5 is pressed and the tip 16 of the pressing piece is pressed.
By pressing, the pulling force is applied to the cutting edge tip 5 at the same time as the pressing force. As shown in FIG. 5, the movement of the cutting blade tip 5 in the retracting direction is restricted by the tip of the adjusting screw 17 screwed onto the pressing piece 6. The reamer body 2 has a hole 18 penetrating therethrough for inserting a spanner to operate the adjusting screw 17.

A locking wall 19 is provided on the pressing piece 6 so as to project the movement of the cutting blade tip 5 in the longitudinal direction, that is, the axial direction of the tool when the reamer is mounted. As shown in FIG. 6, the pressing piece 6 is a locking screw 1 screwed onto the reamer body 2.
With the head jaw of 9, the rotational movement around the outermost radial point P is locked.

Fine adjustment is performed as follows. First, the tightening screw 14 is temporarily tightened so that the pressing piece 6 presses the cutting edge tip 5 lightly. Next, the adjusting screw 17 is operated to adjust the outermost radial point P so as to be within a predetermined dimensional accuracy,
Determine the reamer diameter. Next, the protrusion amount of the locking screw 20 is adjusted to determine the position of the pressing piece 6 so that the back taper of the outer peripheral cutting edge 9 falls within a predetermined accuracy range. And
When the tightening screw 14 is fully tightened, the mounting of the cutting blade body is completed. The back taper is adjusted by the movement in the direction of rotation about the outermost radial point P. Therefore, the problem of the conventional work such as the deviation of the adjusted reamer diameter that occurs in conjunction with this work is solved, and the adjustment work is performed. You will be able to finish quickly.

Next, FIGS. 7 and 8 show a throw-away type reamer 1 showing an embodiment relating to claims 1 and 5 to 6, in the middle of the reamer body 2 and the cutting blade tip 5. The cartridge 21 is interposed. The cutting blade body is formed of only the cutting blade tip 5, and is fastened and fixed to the cartridge 21 by the fastening screw 22. At this time, the back surface 12 of the cutting blade tip 5 is formed into a curved surface having a radius R, and the cartridge 21 is housed in the receiving portion 7 which has the same radius R and is fan-shaped.

A locking screw 20 is screwed into the cartridge 21, and the flange of the head thereof regulates the amount of the cutting blade tip 3 in the rotating direction. The cutting blade tip 3 is set so as to rotate about the outermost radial point P, and a clearance is provided between the tightening screw 22 and the tip hole for fine adjustment. The cartridge 21 is clamped and fixed by a pressing piece 23 incorporated in the reamer body 2. If the tip of the pressing piece is pressed against the inclined surface of the V groove provided on the upper surface of the cartridge 21, the tightening and fixing will be more firm.

The back surface 26 of the cartridge 21 is an inclined surface, and the wedge piece 2 housed in the square groove provided in the reamer body 2
It is in contact with the wedge surface of No. 4. By operating the left and right screws 25 that are screwed to both the reamer body 2 and the wedge piece 24 with different degrees of freedom, the wedge piece 24 is lifted and lowered, whereby the cartridge 21 moves by the wedge action, and Fine adjustment is possible. As for the adjustment method, as in the first embodiment, the back taper is adjusted after the reamer diameter is adjusted.

According to the present invention, by adopting the mechanism of adjusting the back taper of the outer peripheral cutting edge by the rotational movement about the outermost radial point, the reamer diameter adjusted in advance has an influence when the back taper is adjusted. Since it does not occur, it becomes possible to easily adjust the reamer diameter and the back taper.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, (a) is a front view and (b) is a side view.

FIG. 2 is an enlarged view of the reamer tip portion of FIG. 1 (b).

3A and 3B show the cutting blade tip mounted in FIG. 1, in which FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 shows the pressing piece mounted in FIG. 1, (a) is a front view, (b) is a side view, and (c) is a bottom view.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a side view showing a second embodiment of the present invention.

8 is a front view of FIG. 7. FIG.

[Explanation of symbols] 5 cutting edge chips 6 pressing pieces 7 Receptor 12 back 17 Adjustment screw 20 locking screw 21 cartridges 24 wedge pieces 26 back P outermost diameter point R (circular curved surface) radius

Claims (6)

[Claims] 1. The tip of the reamer main body is provided with a receptacle that is dented in a fan shape around the outermost radial point that determines the reamer diameter, and the rotation of the cutting blade mounted on this receptacle is provided. A throw-away type reamer comprising locking means for restraining movement and adjusting means capable of pushing out the cutting blade in the outer peripheral direction. 2. The cutting blade body is composed of a cutting blade tip and a pressing piece, and the back surface of the pressing piece is formed in a circular curved surface so as to come into contact with the fan-shaped surface of the receiving portion. The throw-away reamer according to claim 1. 3. The throw-away reamer according to claim 1 or 2, wherein an adjusting screw is incorporated in the pressing piece. 4. The V-groove is formed on the upper surface of the cutting blade tip, and the tip of the pressing piece presses the inclined surface of the V groove to fix the cutting blade tip. The throw-away reamer according to claim 3. 5. The cutting blade body is composed of a single cutting blade tip whose one side surface is formed into a circular curved surface, and a cartridge having the receiving portion is incorporated in the reamer body, and the cutting blade tip is a fan-shaped cartridge. The circular curved surface is placed so as to contact the surface, and is fixed by screwing.
Throw-away reamer described in. 6. The throw-away reamer according to claim 1 or 5, wherein the cartridge is pushed out in the outer peripheral direction by a wedge piece mounted on the back surface of the cartridge.