JP2004195572A - Reamer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepped reamer superior in chip discharge performance, and superior in work efficiency. <P>SOLUTION: This reamer is formed by installing a cutting edge tip 12 on the outer peripheral side of a reamer body 5. The reamer body 5 forms a stepped constitution having a cutting edge part more than two stages being smallest in a diameter of a tip cutting edge part 6 and largest in a diameter of a cutting edge part 9 position in a place most distant from the tip in the axis O direction. Plural strips of chip discharge grooves 11 extending in the axis O direction from the tip of the reamer body 5 over the respective stages are formed at an interval in the peripheral direction on the outer periphery of these cutting edge parts. The cutting edge tip 12 is arranged by one on the tip outer peripheral side of one groove in these chip discharge grooves 11 in one cutting edge part. The cutting edge tip 12 arranged in the partial cutting edge part among these parts is arranged in the chip discharge groove 11 different from the cutting edge tip 12 arranged in the other cutting edge part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a reamer provided with a cutting edge chip on an outer peripheral side of a chip discharge groove and used for finishing cutting of a hole machining.
[0002]
[Prior art]
Conventionally, as this kind of reamer, the one shown in FIGS. 5 and 6 has been proposed (Patent Document 1). FIG. 5 is a front view of the reamer, and FIG. 6 is a bottom view of FIG. The outer periphery of the reamer main body 1 is notched with one blade groove 2 extending from the tip in a direction along the axis O, and has a reamer blade 3 on the outer peripheral edge thereof. Further, the blade portion of the reamer main body 1 has a stepped configuration in which the diameter of the front end portion is reduced and the rear end side is increased. The step is set to the size of the finishing allowance. Therefore, the cutting blade portion 3 also becomes a two-step cutting blade, and is divided into a leading blade 31 and a finishing blade 32 to be back-fed.
[0003]
Further, the reamer main body 1 is provided with two grooves 4 having the same shape as the blade groove 2 separately from the blade groove 2 and are equally arranged in the circumferential direction together with the blade groove 2. The leading edge 31 is formed on the outer peripheral edge of the groove 4 as well as the leading edge 31 of the blade groove 2 in the portion where the diameter of the tip is small, so that a three-blade configuration is formed as a whole.
[0004]
[Patent Document 1]
JP 2001-113413 A
[Problems to be solved by the invention]
When cutting the prepared hole using such a reamer, since the leading blade is a multi-blade, efficient machining with an increased feed rate is possible. However, there is a problem that the discharge position of the chips generated by the preceding blade and the discharge position of the chips generated by the finishing blade become the same, and it is not possible to realize good chip discharge performance.
Then, in view of such a problem, an object of the present invention is to provide a stepped reamer having excellent chip dischargeability and further excellent processing efficiency.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a reamer in which a cutting blade tip is mounted on an outer peripheral side of a reamer main body, wherein the reamer main body has the smallest diameter of a distal end cutting portion and is farthest from the distal end in the axial direction. A stepped configuration having two or more cutting edge portions having the largest diameter of the cutting edge portion located at the place is provided. A plurality of cutting edge portions extending in the axial direction from the tip of the reamer main body over the respective steps over the outer periphery of each cutting edge portion. The chip discharge grooves of the strip are formed at intervals in the circumferential direction, and in one cutting edge portion, one of the chip discharge chips is provided on the outer periphery of the tip end of one of the chip discharge grooves. The cutting edge chips provided in some of the cutting edge portions are provided in a chip discharge groove different from the cutting edge chips provided in the other cutting edge portions.
According to the reamer according to the present invention, unlike the blade groove 2 in the above-mentioned conventional reamer, since one chip discharge groove is not provided with the cutting edge chips of all the cutting edge portions, such a chip discharge groove is used. Thus, good chip discharge performance can be realized without causing the chips to be clogged.
[0007]
The invention according to claim 2 is characterized in that the cutting edge chips are provided in different chip discharge grooves in the cutting edge portions adjacent in the axial direction.
According to the reamer according to the present invention, the discharge position of the chips generated by the cutting edge chips adjacent in the axial direction is different in the circumferential direction of the reamer main body, and when the chips are discharged, the chips may interfere with each other. Therefore, more excellent chip discharge performance can be realized.
[0008]
According to a third aspect of the present invention, in the reamer according to the first or second aspect, the mounting positions of the cutting blade tips mounted on the respective cutting blade portions are spirally arranged around the axis. And
ADVANTAGE OF THE INVENTION According to the reamer which concerns on this invention, even if it installs in the same chip discharge groove with respect to the circumferential direction of a reamer main body in the cutting edge part separated in the axial direction, the space | interval of these cutting edge chips is ensured large. It can achieve good chip discharge performance, and the cutting edge tip can be arranged in a balanced manner in the circumferential direction of the reamer main body, so that the coaxiality of the processing hole, roundness, straightness of the reamer, etc. It is possible to secure a stable cutting state.
[0009]
According to a fourth aspect of the present invention, in the reamer according to any one of the first to third aspects, the cutting edge tip forms a 0 ° or positive radial rake angle with respect to a wall surface in a rotating direction forming a chip discharge groove. It is characterized by having and being mounted.
According to the reamer according to the present invention, it is possible to improve the biting property of the cutting blade with respect to the work, and to reduce the cutting resistance. High efficiency reamer processing can be realized in combination with the improvement of the dischargeability.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
The reamer of the present embodiment is a reamer in which the cutting edge tip 12 is mounted on the outer peripheral side of the reamer main body 5. The diameter of the tip cutting edge portion 6 is smallest, and The cutting edge 9 located at a distant place has a stepped configuration having four cutting edges with the largest diameter, and this step is set as a finishing allowance. In addition, the outer peripheral portion of the reamer main body 5 extends linearly in parallel with the rotation axis O from the bottom surface 10 of the distal cutting edge portion 6 toward the base end side of the cutting edge portion 9. Once cut off to the outer peripheral side of the reamer main body 5 on the side, a notch is formed on the outer peripheral surface of the reamer main body 5 at the base end of the cutting blade portion 9 to form a chip discharge groove 11. The grooves 11 are formed three at substantially equal intervals in the circumferential direction of the reamer body 5. Therefore, the reamer main body 5 forms a windmill shape with approximately three blades when viewed from the bottom.
[0011]
Further, in the outer peripheral surface 13 between the two chip discharge grooves 11 of the reamer main body 5, a region behind the cutting edge tip 12 in the rotational direction has a peripheral surface 13A whose distance (outer diameter) from the rotation center O is shorter than the cutting blade 12A. Further, a small-width area further behind the adjacent chip discharge groove 11 is a pad surface 13B having an outer diameter larger than the peripheral surface 13A and smaller than the cutting edge 12A.
[0012]
The cutting edge tip 12 is provided with one cutting edge tip 12 on one outer peripheral end of one of the chip discharge grooves 11 in the one cutting edge portion. The chip discharge groove 11 on which the cutting edge portions are attached differs in the circumferential direction of the reamer main body 5 between the cutting edge portions adjacent in the direction of the axis O.
According to the reamer of the present embodiment configured as described above, the cutting edge chip 12 provided on a part of the respective cutting edge portions 6, 7, 8, and 9 is attached to the other cutting edge portion. Since it is provided in the chip discharge groove 11 different from the provided cutting edge chip 12, the cutting chip 12 of all the cutting blade portions 6, 7, 8 and 9 is not provided in one chip discharge groove 11. Therefore, good chip discharge performance can be realized without the chips being clogged in the chip discharge groove 11.
Further, the discharge positions of the chips generated by the cutting blade tips 12 adjacent in the direction of the axis O are different in the circumferential direction of the reamer body 5, and when the chips are discharged, the chips do not interfere with each other, so that the chips are further prevented from interfering with each other. Good chip discharge performance can be realized.
[0013]
Further, the mounting positions of the cutting blade tips 12 mounted on the respective cutting blade portions 6, 7, 8, 9 are spirally arranged around the axis O. That is, in the present embodiment, the chip discharge groove 11 to which the cutting edge chip 12 is attached extends from the cutting edge portion 6 at the front end toward the cutting edge portion 9 at the rear end side in one of the circumferential directions of the reamer main body 5. In particular, one of the circumferential directions is the rear side in the reamer rotation direction during machining.
According to the reamer of the present embodiment configured as described above, even when the cutting edge chip 12 is provided in the same chip discharge groove 11 with respect to the circumferential direction of the reamer main body 5 at the cutting edge portion separated in the direction of the axis O, Since a large interval between the cutting edge chips 12 can be ensured, good chip discharge performance can be realized, and the cutting edge chips 12 can be arranged in a well-balanced manner in the circumferential direction of the reamer main body 5, so that machining holes can be formed. The coaxiality, roundness and straightness of the reamer can be secured, and a stable cutting state can be realized.
[0014]
In one of the chip discharge grooves 11 formed in each cutting edge portion, a cutting edge chip is formed in a concave portion forming a seating surface 12B formed on the outer peripheral side of the front end on a wall surface 11A facing the rotation direction. 12 are respectively fixed by brazing or the like. These cutting blade tips 12 protrude from the reamer body 5 on the outer peripheral side of the distal end, the cutting edge 12A is formed on the side ridge on the outer peripheral side of the distal end, and a positive radial rake angle with respect to the wall surface 11A facing the rotation direction. Is formed. The cutting blade 12A is provided with a back taper along the rotation axis O.
According to the reamer of the present embodiment configured as described above, the cutting edge 12A forms a positive rake angle with respect to the work, so that the cutting edge 12A can improve the biting of the work. In addition, the cutting resistance can be reduced, and in combination with the above-described realization of the excellent chip discharge property, highly efficient reaming can be performed. The radial rake angle may be 0 °.
[0015]
The reamer main body 5 has a stepped configuration having four stages of cutting blades 6, 7, 8, and 9. One cutting blade tip 12 is provided on the outer periphery of the tip of each cutting blade. I have. Further, since the steps formed by the cutting blade portions 6, 7, 8, 9 are set to the finishing allowance, the reamer exchange work in the finishing process, which was required in the ordinary reamer processing, is not required, and the reamer is not required. At the time of replacement, variations in the coaxiality of the mounting reamer before and after replacement due to looseness of the chuck portion and the like can be reduced, so that high-precision reamer processing can also be realized.
[0016]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cutting tips provided on some of the cutting edges are different from the cutting tips provided on the other cutting edges. Since the chip is provided in the discharge groove, the cutting chips of all the cutting portions are not provided in one chip discharge groove. Therefore, good chip discharge performance can be realized without the chips being clogged in the chip discharge groove.
[0017]
According to the second aspect of the invention, the discharge positions of the chips generated by the cutting blade tips adjacent in the axial direction are different in the circumferential direction of the reamer main body, and when the chips are discharged, the chips interfere with each other. Since there is no such problem, it is possible to realize a better chip discharge property.
[0018]
According to the third aspect of the present invention, even when cutting tips are provided in the same chip discharge groove in the reamer main body circumferential direction at the cutting edges separated in the axial direction, a large interval between these cutting tips is secured. It can realize good chip discharge performance, and can arrange the cutting edge tips in the circumferential direction of the reamer body in good balance, so that the coaxiality of the processing hole, roundness, straightness of the reamer, etc. And a stable cutting state can be realized.
[0019]
Further, according to the invention according to claim 4, it is possible to improve the biting property of the cutting blade with respect to the work, and it is possible to reduce the cutting resistance, and the invention according to any one of claims 1 to 3 This makes it possible to realize high-efficiency reamer machining in combination with the improvement in chip dischargeability.
[Brief description of the drawings]
FIG. 1 is a front view showing a reamer according to an embodiment of the present invention.
FIG. 2 is a diagram combining the arrow AA diagram and the DD diagram shown in FIG. 1;
FIG. 3 is a BB view taken in the direction of the arrow shown in FIG. 1;
FIG. 4 is an arrow CC diagram shown in FIG.
FIG. 5 is a front view of a conventional reamer.
FIG. 6 is a bottom view of the reamer shown in FIG. 5;
[Explanation of symbols]
5 Reamer main body 6, 7, 8, 9 Cutting edge portion 10 Bottom end 11 of reamer main body 5 Chip discharge groove 11A Wall surface facing cutting direction forming chip discharge groove 11 Cutting edge O Central axis of reamer main body

Claims (4)

In a reamer in which a cutting edge tip is mounted on the outer peripheral side of the reamer main body, the reamer main body has a tip cutting edge portion having the smallest diameter and a cutting edge portion located farthest from the tip end in the axial direction. It has a stepped configuration having two or more cutting blades with the largest diameter, and a plurality of chip discharge grooves extending in the axial direction from the tip of the reamer body over each step on the outer periphery of these cutting blades. In one cutting edge portion, one cutting edge tip is provided on the outer periphery of the tip of one of these chip discharge grooves. A reamer characterized in that a cutting edge tip provided on a blade portion is provided in a chip discharge groove different from a cutting edge tip provided on another cutting edge portion. The reamer according to claim 1,
A reamer, wherein the cutting edge chips are provided in different chip discharge grooves in the cutting edge portions adjacent in the axial direction. The reamer according to claim 1 or 2,
A reamer, wherein mounting positions of the cutting blade tips mounted on the respective cutting blade portions are spirally arranged around the axis. The reamer according to any one of claims 1 to 3,
A reamer characterized in that the cutting edge tip is mounted with a 0 ° or positive radial rake angle with respect to a wall surface in the direction of rotation forming a chip discharge groove.

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