JP4485120B2 - Reamer drill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reamer drill used like a deep hole cutting.
[0002]
[Prior art]
This type of reamer drill, is prepared by attaching the cutting blade to the tip of the drill head. For the conventional drill, it is not possible to specifically list publicly known documents, but the outer peripheral edge of the cutting edge of the cutting blade is located outside the outer peripheral surface of the drill head and is positioned at the maximum radius from the rotation axis of the drill. Therefore, cutting is performed at the outer peripheral edge, and usually a chip breaker is formed on the drill rotation direction side of the outer peripheral edge of the blade edge, and the counter-rotation of the drill at the outer peripheral edge of the blade edge is performed. A margin portion having the same radius as the radius of the outer peripheral edge of the blade edge portion from the rotation axis is formed on the direction side.
[0003]
[Problems to be solved by the invention]
Reamer drill having the structure described above, since it is adapted to perform cutting of the workpiece only at the outer peripheral edge portion of the cutting edge portion in the rotary shaft sincerely maximum radial position of the drill, its cutting marks macro As a result, it became a peak and valley shape (sawtooth shape), and the finished surface roughness and cylindricity of the workpiece did not increase, and it was very difficult to perform high-precision cutting.
[0004]
In view of the above problems, it is possible to improve the finished surface roughness and the cylinder of the workpiece, providing a reamer drill which can extend the cutting edge stronger becomes in service life Objective.
[0005]
[Means for Solving the Problems]
The invention according to claim 1, in reamer drill comprising attaching the cutting blade to the tip of the drill head, the cutting edge outer circumferential side of the cutting blade 2, the drill D1 be outside from the outer peripheral surface 1a of the drill head 1 A cutting edge 3 extending linearly or arcuately is formed so as to reduce the radius from the rotational axis O in the direction of drill rotation starting from the portion at the maximum radius R position from the rotational axis O as the starting point A. A margin portion 4 having the same radius as the distance from the rotation axis O to the start point A site is formed on the counter-rotating direction side of the drill from the start point A of the cutting edge portion 3. At the end point B, a blade edge portion outer end surface 5 is formed parallel to a line extending in the radial direction from the rotation axis O. Therefore, the first cutting edge corner portion formed at the end point B of the cutting edge portion 3 is formed. The angle α of K1 is approximately 90 °, so that the first cutting edge cord The main cutting is performed at the knurled portion K1, the remaining cutting portion is cut or compressed at the second cutting edge corner portion K2 formed at the starting point A of the cutting edge portion 3, and the second cutting edge is cut at the margin portion 4. The surface to be cut that has been subjected to the cutting action or the crimping action by the blade corner portion K2 has a smooth surface finish.
[0006]
Claim 2 is the reamer drill according to claim 1, characterized in that the formation of the chip breaker 6 in the drill rotation direction from the end point B of the cutting edge 3.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Side view of (A) is 1 showing a main portion of the reamer drill D1 according to the present invention, is an enlarged view of a portion indicated by an arrow b in (B) is its plan view, FIG. 2 in FIG. 1 (B) . In FIG, 1 is a drill head of the reamer drill D1, cutting blade 2 is fixed to the tip of the drill head 1. GP is a drill guide pads fixed to the distal end outer side of the drill head 1, O represents a rotation axis of the reamer drill D1, H indicates the direction of rotation of the reamer drill D1.
[0008]
The cutting blade 2, the outer circumference side of the cutting edge, in FIG. 1 (B), particularly as shown in Figure 2, from the rotation axis O of the reamer drill D1 be outside from the outer peripheral surface 1a of the drill head 1 A cutting edge portion 3 that extends linearly so as to reduce the radius R from the rotation axis O from the starting point A in the drill rotation direction H is formed with the portion at the maximum radius R as the starting point A. the counter-rotating direction side of the reamer drill D1 from the starting point a of the section 3, in which the formation of the margin portions 4 having the same radius R as the distance to the starting point a site from the rotation axis O, the end point of the cutting edge 3 The main cutting is performed by the first cutting edge corner portion K1 formed in B, and the uncut portion is cut or compressed by the second cutting edge corner portion K2 formed at the starting point A of the cutting edge portion 3. I have to. The cutting edge portion 3 is formed in a straight line here, but may be formed in an arc shape.
[0009]
Incidentally, the cutting edge outer end surface 5 located at the end point B of the cutting edge 3 of the cutting blade 2, the radial lines from the rotational axis O of the reamer drill D1, i.e. so as to be positioned substantially parallel to the radial line It is arranged. Therefore, the angle α of the first cutting edge corner portion K1 formed at the end point B of the cutting edge portion 3 is approximately 90 °.
[0010]
In reamer drill D1 of this embodiment, as shown in FIG. 2, the circumferential length of the margin section 4 eta is a 0.2 to 1.2 mm, cutting edge formed on the front side of the margin portions 4 The length δ of 3 is 0.4 mm to 0.5 mm. Further, an angle (cutting edge angle) θ formed by an extension line m connecting both ends of the margin part 4 and an extension line n connecting the start point A and the end point B of the cutting edge part 3 is 30 ′ to 10 °. Further, the facing interval γ of the end point B of the cutting edge portion 3 with respect to the extension line m of the line connecting both ends of the margin portion 4 is set to 0.005 mm to 0.10 mm.
[0011]
Next, the operation of the cutting blade 2 having the above-described cutting edge portion 3 will be described. When cutting the workpiece, the main cutting is performed by the first cutting edge corner portion K1 formed at the end point B of the cutting edge portion 3. In addition, the second cutting edge corner portion K2 formed at the starting point A of the cutting edge portion 3 causes the uncut portion to be cut or compressed. More specifically, First, the first cutting edge corner portion K1 formed at the end point B of the cutting edge portion 3 at a radius smaller than the maximum radius R from the rotation axis O of the drill D1 bites and starts cutting. Cutting (main cutting) is performed up to the starting point A of the cutting edge portion 3 located at the maximum radius R from the rotational axis O, and the cutting surface has peaks and valleys (peaks and valleys like a saw tooth). A form in which valleys are continuous) is generated. However, this peak-and-valley has a smooth surface (burnish face) that has been polished by receiving the cutting action or pressure-bonding action by the second cutting edge corner portion K2 formed at the starting point A of the cutting edge portion 3. As a result, the surface roughness of the surface to be cut becomes very good.
[0012]
Further, in the cutting blade 2, in the counter-rotational direction of the reamer drill D1 from the starting point A of the cutting edge portion 3, a margin portion 4 having the same radius as the distance from the rotational axis O of the reamer drill D1 to the start point A site Since it is formed, the cutting action or the crimping action by the second cutting edge corner portion K2 works effectively at the margin portion 4, the surface to be cut becomes smoother, and the surface roughness becomes even better.
[0013]
Further, according to the cutting blade 2 having such a cutting edge 3, the end point B of the cutting edge portion 3 in the maximum radius R smaller than the radial position from the rotation axis O of the reamer drill D1 as described above The blade edge portion outer end surface 5 is formed in parallel with a line extending in the radial direction from the rotation axis O, and therefore the angle α of the first cutting edge corner portion K1 formed at the end point B of the cutting edge portion 3 is formed. is because mainly performs cutting by the first cutting edge corner portion K1 is approximately 90 °, it becomes difficult crushed cutting edge, i.e. the cutting edge becomes stronger, it is possible to extend the service life.
[0014]
3 shows a reamer drill D2 fitted with cutting blades 2 formed with chip breakers 6 in the drill rotational direction side of the end point B of the cutting edge 3, (A) is a plan view of the reamer drill D2, (B) FIG. 5 is an enlarged view of a portion indicated by an arrow B in (A). Cutting blade 2 attached to the reamer drill D2, as can be seen from FIG. 3 (B), the starting point on the outer circumference side of the cutting edge portion, a portion at the position of maximum radius R from the rotational axis O of the reamer drill D2 from this form the cutting edge 3 extending straight or arc-shaped so as to reduce the radius R from the rotation axis O to the drill rotation direction H as a, reamer drill D2 from the starting point a of the cutting edge 3 contrary to the rotation direction, the rotation axis in terms of forming the margin portions 4 having the same radius R as the distance to the starting point a site from heart O similar to the reamer drill D1, reamer drill from the end point B of the cutting edge portion 3 of the The difference is that the chip breaker 6 is formed on the rotational direction side of D2.
[0015]
Further, similarly to the reamer drill D1 also the action of the cutting blade 2, to perform the main cutting by the first cutting edge corner portion K1 formed in the end point B of the cutting edge 3, the starting point A of the cutting edge 3 The remaining cutting portion is cut or compressed by the formed second cutting edge corner portion K2, but the cutting that has been cut at the first cutting edge corner portion K1 by providing the chip breaker 6 is provided. Since the scrap is curled to a small radius and cut to an appropriate length, the dischargeability of the cutting scrap is improved, which is suitable for a ductile material. The specific action of the cutting edge 3, is the same as the case of the reamer drill D1 described above, a description thereof will be omitted.
[0016]
[0017]
[0018]
[0019]
【The invention's effect】
Reamer drill of the invention according to claim 1, the cutting edge outer circumferential side of the cutting edge, than this drill rotation sites in the rotary shaft sincerely maximum radius positions of the drill be outside from the outer peripheral surface of the drill head as the starting point forming a cutting edge extending linearly or arc shape so as to reduce the radius from the rotation axis direction, the end of the cutting edge portion, lines and flat row extending in the rotation axis sincerely radially And a second cutting edge corner portion formed at the starting point of the cutting edge portion. The second cutting edge corner portion is formed at the first cutting edge corner portion formed at the end point of the cutting edge portion. Since the remaining portion is cut or compressed in step 1, the workpiece is first formed at the end point B of the cutting edge at a radius smaller than the maximum radius from the rotation axis of the drill. The first cutting edge corner bites and starts cutting. Cutting is performed from the rotation axis to the starting point of the cutting edge at the maximum radius, and a peak and valley (a shape in which peaks and valleys are continuous like a saw tooth) is generated on the surface to be cut. However, this peak-and-valley becomes a smooth surface by receiving the cutting action or the pressure-bonding action by the second cutting edge corner portion, whereby the surface roughness of the surface to be cut can be improved.
[0020]
In addition, at the end point of the cutting edge portion at a radial position smaller than the maximum radius from the rotation axis of the drill as described above, the outer edge surface of the cutting edge portion positioned parallel to the line extending in the radial direction from the rotation axis is provided. formed, therefore, from performing main cutting by the first cutting edge corner portion is an angle of the first cutting edge corner portion is approximately 90 °, which is formed at the end of the cutting edge portion, the cutting edge does not easily collapse, That is, the blade edge portion becomes strong and the service life can be extended.
[0021]
Furthermore, according to the reamer drill of the present invention, the drill in the counter rotation direction rear side of the start point of the cutting edge, by forming the margin portion having the same radius as the distance to the starting point from the rotation axis The cutting action or the pressure-bonding action by the second cutting edge corner portion works effectively in the margin portion, the surface to be cut becomes smoother, and the surface roughness becomes even better.
[0022]
According to the reamer drill of the invention according to claim 2, by forming the chip breaker drill rotation direction side of the end point of the cutting edge, curled cutting chips that are cut by the first cutting edge corner portion to the minor radius Since it cuts into a suitable length, the dischargeability of the cutting waste is improved, which is suitable for a ductile material.
[Brief description of the drawings]
1 (A) is a side view showing a main part of the reamer drill according to the present invention, (B) is a plan view thereof.
FIG. 2 is an enlarged view of a portion indicated by an arrow a in FIG.
Figure 3 is a plan view of a reamer drill fitted with a cutting edge that forms the shape of the chip breaker drill rotation direction front end side of the end point of the cutting edge, (B) is an enlarged view of a portion indicated by an arrow B in (A) is there.
[Explanation of symbols]
D1 Reamer drill O Drill rotation axis 1 Drill head 2 Cutting blade 3 Cutting edge A Cutting blade start point B Cutting edge end K1 First cutting edge corner K2 Second cutting edge corner 4 Margin 6 Chip breaker

Claims (2)

In reamer drill comprising attaching the cutting blade to the tip of the drill head, the cutting edge outer circumferential side of the cutting edge, the site located be outside from the outer peripheral surface of the drill head to the maximum radial position from the rotation axis of the drill As a starting point, a cutting blade portion extending linearly or arcuately so as to reduce the radius from the rotation axis in the drill rotating direction is formed, and on the counter-rotating direction side of the drill from the starting point of the cutting blade portion, A margin part having the same radius as the distance from the rotation axis to the starting point portion is formed, and an end surface of the cutting edge part is located at the end point of the cutting edge part in parallel with a line extending in the radial direction from the rotation axis. Therefore, the angle of the first cutting edge corner portion formed at the end point of the cutting edge portion is approximately 90 °, and the main cutting is performed at the first cutting edge corner portion. Second cutting edge corner formed at the start of the part To perform the cutting or compression of uncut portions, in the margin, reamer drill has to be cut surface which receives the cutting action or crimping action of the second cutting edge corner portion K2 to be a smooth surface shape finishing. Reamer drill according to claim 1 formed with the chip breaker in the drill rotation direction from the end point of the cutting edge.

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