JPH0911039A - Reamer - Google Patents

Abstract

PURPOSE: To secure clamping strength for a cutting edge tip and to increase a projection quantity of an outer circumference side cutting edge. CONSTITUTION: A cutting edge tip 15 is mounted in a mounting seat 3 in a tool main body 2, while a fixing screw 18 is inserted into a through hole 16 in the tip 15 so as to be screwed to the tool main body 2. A regulation screw 20 is screwed into an adjusting hole 19, and a pressing part, 20a in its front end is brought into contact with an inner circumference side face of the cutting edge tip 15. In this way, the fixing screw 18 is elastically deformed when the adjusting screw 20 is inserted, so that a moving quantity of an outer circumference side cutting edge 15b is increased while clamping strength for the tip is increased because of reaction force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reamer capable of adjusting a cutting edge position on an outer peripheral side of a mounted cutting blade tip.

[0002]

2. Description of the Related Art Conventionally, as this type of reamer, there is one as shown in FIGS. 3 to 5, FIG. 3 is a front view of the tip of the reamer, FIG. 4 is a sectional view taken along the line AA of FIG. Is BB in FIG.
It is a line sectional view. The reamer 1 is attached to a mounting seat 3 formed on the outer peripheral side of the tip of the tool body 2, for example, so that a cutting edge tip 4 having a substantially rectangular plate shape has its long side along the rotation axis O of the tool body 2. ing. The cutting edge tip 4 has a ridge line that forms each long side of the upper surface 4a of the cutting edge tip 4 in the mounted state.
b, and the ridgeline forming each short side of the upper surface 4a is attached to the tip side cutting blade 4
It is marked as c and can be used after changing corners. Further, a concave portion 5 having a substantially V-shaped cross section is formed in the central portion of the upper surface 4a along the longitudinal direction.

In the sectional views shown in FIGS. 4 and 5, the tool body 2 has a shape in which a part of a circle is cut out in a substantially flat surface, and its peripheral side surface guides the movement and cutting of the reamer 1. A plurality (two in the figure) of pads 6 are attached in a dispersed manner in the circumferential direction. Further, in the notched portion of the tool body 2, a concave groove 7 is formed along the outer peripheral cutting edge 4b at the center side adjacent to the mounting seat 3. A clamp member 9 that fits in the groove 7 and presses the recess 5 of the cutting blade tip 4 with the clamp portion 9a is provided. The clamp member 9 has a substantially half-moon shape in plan view, and the tool for the clamp member 9 and the groove 7 is provided. In order to firmly fit and fix the main body 2, the tip portion 10 of the headless screw 10
a and the rear end portion 10b are screwed into the clamp member 9 and the screw holes of the tool body 2, respectively. Moreover, the clamp portion 9a is fitted into the upper surface recess 5 of the cutting edge tip 4 in order to increase the clamping force. Further, before and after the screw 10 along the direction of the rotation axis O of the tool body 2, a pair of adjustment holes 12, 12 are drilled up to the side surface 4d of the inner cutting edge 4b of the cutting edge tip 4, respectively. The area (opening side) is threaded. The adjustment holes 12 and 12 are formed along the upper surface of the clamp member 9 (see FIG. 4). This adjustment hole 1
2 and 12, the side surface 4d of the cutting edge tip 4 by moving back and forth
A headless adjusting screw 13, 13 for pushing a small amount is screwed, and a pressing portion 13b for pressing the side surface 4d of the chip 3 with the tip inclined surface 13a is inserted into the tip side thereof.

When the prepared hole is finish-cut by using such a reamer 1 and the outer peripheral side cutting edge 4b is worn by the cutting, the cutting edge 4b is re-polished to be used again for the finish cutting. You can In this case, when the re-polished cutting edge tip 4 is attached to the seating surface 3 which is the original position, the protrusion amount of the outer peripheral side cutting edge 4b with respect to the outer peripheral surface of the tool body 2 is reduced by the amount of wear and re-polishing. ing. Therefore, if the adjusting screws 13 and 13 are pushed in by a small amount, the cutting blade tip 4 projects outward in the radial direction by a small amount against the clamping force of the clamp member 9, and the outer peripheral cutting blade 4b has a predetermined protruding amount. Can be adjusted to. Further, by changing the pushing amount of the pair of adjusting screws 13, 13, the outer peripheral cutting edge 4
A back taper can be attached to b.

[0005]

However, in the reamer 1 having the above-mentioned structure, since the cutting blade tip 4 is pressed and fixed by the clamp member 9, the upper surface 4a of the cutting blade tip 4 is fixed. Since the concave portion 5 on which the clamp portion 9a is seated and pressed is formed, there is a drawback that the chip strength is small. Also, the clamp portion 9a
A large clamping force can be secured by fitting and pressing the concave portion 5 with the concave portion 5, but the outer peripheral side cutting blade 4 by the adjusting screw 13 is correspondingly secured.
There is also a drawback that the amount of movement of b can be kept very small.

In view of the above problems, the present invention provides a reamer capable of reliably fixing the cutting edge tip and allowing the outer peripheral side cutting edge to have a larger radial adjustment amount than the conventional reamer. The purpose is to

[0007]

The reamer according to the present invention comprises:
A cutting blade tip is attached to the mounting seat on the outer peripheral side of the tip of the tool main body, and an adjusting member capable of adjusting the amount of protrusion of the outer peripheral cutting edge of the cutting blade tip is screwed into an adjusting hole of the tool main body so that it can be moved forward and backward. In the reamer whose tip pressing portion is in contact with the inner peripheral side surface of the cutting blade tip, a through hole for a fixing screw is bored in the center of the cutting blade tip, and a fixing screw for inserting the through hole is provided. The cutting blade tip is fixed by being screwed into the tool body. Further, the through hole of the cutting blade tip may be formed with a taper portion having an enlarged diameter at its upper part, and the head portion of the fixing screw may abut on the taper portion. or,
The shaft portion of the fixing screw may be loosely inserted into the through hole of the cutting blade tip, and a washer may be interposed between the head portion of the fixing screw and the cutting blade tip.

[0008]

[Operation] When the cutting blade tip is fixed and the adjusting member is used to adjust the protruding amount of the outer peripheral cutting edge, the fixing screw is pushed and bent, so that the cutting blade can be set to a large protruding amount The clamping force of the cutting edge tip is high due to the reaction force generated by the screw. Further, when the cutting blade tip is fixed, the head portion of the fixing screw is fitted and fixed to the taper portion, and a pressing force and a reaction force by the adjusting member are applied to the head portion. Further, the cutting edge tip is firmly fixed to the tool main body through the washer, and moreover, it can be moved extra by the dimensional difference between the outer diameter of the shaft portion of the fixing screw and the inner diameter of the through hole of the cutting edge tip.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 and 2, but the same or similar parts as those of the above-mentioned conventional art will be designated by the same reference numerals and the description thereof will be omitted. FIG.
Shows a reamer tip portion according to the first embodiment of the present invention, (a) is a front view, and (b) is a sectional view taken along line CC of FIG. In FIG. 1, the tip outer peripheral portion of the tool main body 2 is cut out, for example, from a circular shape in cross section in a fan shape at a substantially right angle, and a wall surface facing the rotation direction is used as a seating surface 3. The substantially rectangular plate-shaped cutting blade tip 15 located on the seating surface 3 has a substantially parallel flat plate shape on the upper and lower surfaces, and the outer peripheral side cutting blade 15b extends along the long side of the upper surface 15a and the tip side along the short side. Cutting edges 15c are provided respectively. Moreover, a through hole 16 for a fixing screw is formed at the center of the upper and lower surfaces, and the upper surface side of the through hole 16 is a tapered portion 16a whose diameter is increased toward the upper surface.
Further, a fixing screw hole 17 is provided on the seating surface 3 of the tool body 2, and a fixing screw 18 inserted in the through hole 16 of the cutting blade tip 15 is screwed into the fixing screw hole 17 to form the cutting blade tip 15. Are fixed to the seating surface 3. The head portion 18a of the fixing screw 18 is fitted in the taper portion 16a.

The cutting edge 1 of the long side on the inner peripheral side of the cutting edge tip 15
A pair of adjustment holes 19 and 19 are formed from the outer peripheral surface of the tool body 2 on the side surface 15d of 5b. These adjustment holes 1
9 and 19 are threaded on the rear end side region, and are formed at positions that are substantially equidistant in the front-rear direction of the rotation axis O with respect to the fixing screw 18 shown in FIG. These adjustment holes 19 and 19 are provided on the upper surface 1 with respect to the cutting edge tip 15.
It is provided in the radial direction by inclining at a predetermined angle in the 5a direction (see FIG. 1 (b)). Then, these adjustment holes 19, 19
Headless adjusting screws 20 and 20 are respectively screwed therein, and a pressing portion 20a is inserted at the tip end side of each adjusting screw 20, and the pressing surface 20b at the tip end faces the chip side surface 15d. It is cut diagonally so that it comes into contact with each other to form a flat surface.

Since this embodiment is constructed as described above, when the outer peripheral side cutting edge 15b of the cutting edge tip 15 is worn by cutting, the cutting edge 15b is re-polished and the tool body 2 is re-ground.
To the seating surface 3 of. Then, the protrusion amount of the outer peripheral side cutting edge 15b with respect to the outer periphery of the tool body is adjusted to be a predetermined amount. That is, when the pair of adjusting screws 20, 20 are pushed into the adjusting holes 19, 19 by a small amount, the cutting blade tip 15 is pushed and the shaft portion of the fixing screw 18 is bent to cut the cutting blade tip 15.
Are easily projected to the outer peripheral side in the radial direction. At this time, the amount of protrusion of the outer peripheral side cutting edge 15b is determined by the bending condition of the fixing screw 18, that is, the amount of elastic deformation, and the amount of movement can be set larger than in the case of using the clamp member in the prior art.
Moreover, with respect to the movement of the cutting blade tip 15 by the adjusting screw 20, a large clamping force for the cutting blade tip 15 can be secured by the reaction force generated by the bending of the fixing screw 18 and applied to the cutting blade tip 15. Moreover, since the cutting blade tip 15 can be formed in a parallel plate shape, it is not necessary to form a recess,
There is also an advantage that the rigidity of the tip is high. Further, a back taper can be provided by changing the pushing amount of the pair of adjusting screws 20, 20.

Next, a second embodiment of the present invention will be described with reference to FIG. 2A is a front view of the tip of the reamer, and FIG. 2B is a sectional view taken along line D-D of FIG. In the figure, cutting edge tip 1
The through hole 22 penetrating the upper and lower surfaces of 5 is formed in a cylindrical shape,
And the inner diameter of the shaft portion 23 is the threaded fixing screw 23.
It is set to be slightly larger than the outer diameter of a. Fixing screw 23
The head portion 23b of the is formed larger than the inner diameter of the through hole 22,
With the cutting edge tip 15 seated on the seating surface 3 of the tool body 2 and screwed and fixed in the screw hole 17 by the fixing screw 23,
Head 23b of fixing screw 23 and upper surface 15 of cutting edge tip 15
A washer 24 is interposed between the washer 24 and a. This washer 24 may be ring-shaped or a spring washer (with a slit).

Since the present embodiment has the above-mentioned structure, the outer diameter of the shaft portion 23a of the fixing screw 23 and the cutting edge tip 1 are
5 has a slight gap between it and the inner diameter of the through hole 22, and the amount of this gap is the amount of radial movement (projection amount) of the cutting edge tip 15 at the time of adjustment more than that of the first embodiment described above. Has the advantage of being large. Moreover, with respect to the fixing of the cutting edge tip 15, it is securely fixed by the fixing screw 23 via the washer. The adjusting screw 20 and the pressing portion 20a
Constitutes an adjusting member, but the adjusting member may be constituted only by an adjusting screw, in which case the adjusting hole is threaded over the entire length.

[0014]

As described above, the reamer according to the present invention is
An adjustment member that can adjust the amount of protrusion of the outer cutting edge of the cutting edge tip is screwed into the adjustment hole of the tool body so that it can advance and retreat, and its tip comes into contact with the inner peripheral side surface of the cutting edge tip. In, the through hole for the fixing screw is bored in the center of the cutting blade tip, the fixing screw that penetrates this hole is screwed into the tool body, and since the cutting blade tip is fixed, it is worn When re-polishing the outer peripheral side cutting edge and reusing it, if the adjustment member is pushed into the adjustment hole in minute increments, the shaft part of the fixing screw is elastically deformed and the cutting edge tip is easily projected to the radial outer peripheral side. ,
The movement amount of the outer peripheral side cutting edge can be set to be larger than that in the case of the clamp using the clamp member in the related art. Moreover, regarding the movement of the cutting blade tip by the adjusting member, the clamping force of the cutting blade tip can be set to be large by the reaction force generated by the elastic deformation of the fixing screw and applied to the cutting blade tip. Moreover, since the cutting edge tip can be formed in a parallel plate shape, there is an advantage that the rigidity of the tip is high. Further, the shaft portion of the fixing screw is loosely inserted into the through hole of the cutting blade tip, and the washer is interposed between the fixing screw head and the cutting blade tip, so that the cutting blade tip maintains the clamping force. It is possible to set a larger amount of protrusion in the radial direction.

[Brief description of the drawings]

1A and 1B show a tip portion of a reamer according to a first embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1B is CC in FIG.
It is a line sectional view.

2A and 2B show a tip portion of a reamer according to a second embodiment of the present invention, in which FIG. 2A is a front view and FIG. 2B is DD of FIG.
It is a line sectional view.

FIG. 3 is a front view of a tip portion of a conventional reamer.

4 is a cross-sectional view of the reamer shown in FIG. 3 taken along the line AA.

5 is a cross-sectional view of the reamer shown in FIG. 3 taken along the line BB.

[Explanation of symbols]

 1 Reamer 2 Tool body 3 Seating surface 15 Cutting edge tip 15b Peripheral cutting edge 16,22 Through hole 18,23 Fixing screw 20 Adjusting screw 20a Pressing part 24 Washer

Claims (3)

[Claims] 1. A cutting blade tip is attached to a mounting seat on the outer peripheral side of the tip of the tool main body, and an adjusting member capable of adjusting the protrusion amount of the outer peripheral cutting edge of the cutting blade tip is capable of advancing and retracting into an adjustment hole of the tool main body. In a reamer that is screwed into the tip of the cutting blade tip and abuts against the inner peripheral side surface of the cutting blade tip, a through hole for a fixing screw is formed in the center of the cutting blade tip. A reamer in which a fixing screw penetrating a hole is screwed into the tool body to fix the cutting edge tip. 2. The through hole of the cutting edge tip is formed with an enlarged taper portion at an upper portion thereof, and the head portion of the fixing screw abuts on the taper portion. Reamer described in. 3. The shank of a fixing screw is loosely inserted into the through hole of the cutting blade tip, and a washer is interposed between the head of the fixing screw and the cutting blade tip. Reamer described.