JP2007160507A - Inner diameter machining tool and work cutting method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner diameter machining tool ensuring two passages of cutting oil or chips, improving discharging performance or circulating performance of these, and preventing the deterioration of the stiffness of a small diameter rod portion. <P>SOLUTION: The small diameter rod portion 3 is provided with a columnar shank 3a, and a cutting edge portion 4 formed at a tip end of the shank. A first end portion of a cutting edge ridge 7 provided on the cutting edge 4 is projected out to the side of the shank 3a. On a peripheral surface on the opposite side to the side to which the first end portion of the cutting edge ridge 7 in the small diameter rod portion 3 is projected, a notch plane surface 8 extending in a longitudinal direction of the small diameter rod portion 3 is formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides an inner diameter composed of an attachment portion to a tool holder and a small-diameter bar-like portion in which a part of a cutting edge ridge provided on the tip end side of a cylindrical shank continuous with the attachment portion is projected to the side of the shank. The present invention relates to a machining tool, particularly to an inner diameter machining tool suitable for extremely small inner diameter machining for OA equipment parts, electronic parts, small diameter bearings and the like.

Conventionally, such an inner diameter machining tool has a narrow gap between the small-diameter rod-shaped portion and the inner wall of the workpiece, so that it is difficult for the cutting oil to be applied to the edge of the cutting edge and it is difficult to discharge the chip. As shown in FIG. 3 (a), a cylindrical shank circumferential surface 31 with a relief groove 32 dug, or as shown in FIG. 3 (b), on the upper side of the shank circumferential surface 34 in the figure. There was a thing of the shape which provided the notch plane 35. FIG.
JP-T-08-504370

  By the way, the inner diameter machining tool cuts a part of the small-diameter rod-like portion so that a passage for cutting oil or chips can be secured in the inner diameter machining. This passage is one end of the cutting edge ridge. The part is integrated with a passage formed on the flank side formed by projecting to the side of the peripheral surface of the shank.

Therefore, there is only one passage that leads to the outside of the workpiece hole during the inner diameter machining, and there is a problem that it is difficult to smoothly circulate the cutting oil and discharge chips.

  Hereinafter, this problem will be described in detail.

  As shown in FIGS. 3 (a) and 3 (b), the passage formed by the relief groove 32 or the notch plane 35 provided in the peripheral surface of the shank of the small-diameter bar-shaped part during the inner diameter machining is a part of the cutting edge. Is integrated with the escape portions 33 and 36, which are generated by protruding to the side of the shank. In this configuration, there is only one entrance and exit for the cutting oil and chips leading to the outside of the workpiece hole.

  As a result, as shown in FIG. 4, when cutting oil is injected into the workpiece hole from the passage (relief portion), at the same time, the tip blade tip portion will be discharged from the passage having only one location together with chips generated during machining. However, there is a problem in that it is not smoothly discharged because it is obstructed by the injected cutting oil.

  Moreover, if it is going to improve the circulation of a cutting oil and the discharge | emission property of a chip, it is necessary to enlarge the escape groove 31 and the notch plane 35, and will reduce the cross-sectional area of a shank greatly. As described above, the shank in which the cross-sectional area of the small-diameter bar-shaped portion is greatly reduced has a problem that rigidity is insufficient and chatter vibration is likely to occur during processing.

  In view of the above-described problems of the prior art, the present invention secures two passages for cutting oil or chips to improve the discharge performance or flowability of these, and does not reduce the rigidity of the small-diameter rod-shaped portion as much as possible. An object is to provide an inner diameter machining tool.

  In order to solve the above problems, the inner diameter machining tool of the present invention is an inner diameter machining tool comprising an attachment portion to a tool holder and a small diameter rod-shaped portion continuous to the attachment portion, and the small diameter rod-shaped portion is A shank provided on the mounting portion side, and a cutting edge portion provided at the tip of the shank, the cutting edge portion being provided with one end projecting to the side of the shank. A ridge and a rake face continuously provided on the cutting edge, and at least the shank of the small-diameter rod-shaped portion is located on a side where one end of the cutting edge is projected. The surface is provided with a cut-out plane extending in the longitudinal direction of the small-diameter bar-shaped portion, and the cutting edge ridge passes through the side of the small-diameter bar-shaped portion where one end of the cutting edge ridge protrudes. The notch plane is formed so as to provide a cutting edge side passage. , On the opposite side to the side where the is protruded to one end of the cutting edge of the small-diameter rod portion, characterized in that the rear side passage chips or cutting oil passes are formed so as to be provided.

  According to this configuration, in the inner diameter processing, two passages of cutting oil or chips can be generated around the shank provided in the small-diameter rod-like portion. Then, either one of the passages can be used as a cutting oil introduction path, and the other can be used as a cutting oil and chip discharge path, thereby enabling smooth cutting oil circulation and chip discharge.

  Further, the rake face is constituted by a plurality of faces, and the first rake face that is continuous with the cutting edge ridge among the plurality of faces is on the side where one end of the cutting edge is projected. It is preferable that chips are discharged in the rear side passage formed on the opposite side.

  Moreover, it is preferable that the said notch plane is formed so that it may cross | intersect at least 1 surface of the rake face which consists of these surfaces.

  The notch plane is preferably formed so as to intersect the first rake face.

  In addition, the first rake face is on the peripheral surface of the cutting edge portion located on the side where the one end portion of the cutting edge is protruded and the side where the one end portion of the cutting edge is protruded. It is preferable that each of them is formed so as to intersect with the peripheral surface of the cutting edge portion located on the opposite side.

  The first rake face has a dimension in the longitudinal direction of an intersecting ridge line with a peripheral surface of the cutting edge located on the side where one end of the cutting edge is protruded, and one end of the cutting edge It is preferable that the length in the longitudinal direction of the intersecting ridge line with the peripheral surface of the cutting edge portion located on the opposite side to the protruding side is substantially the same.

  It is preferable that the first rake face is formed so that the dimension in the longitudinal direction is substantially the same from one end portion to the other end portion of the cutting edge.

  In order to solve the above-described problems, a cutting method for a work material according to the present invention includes a work material in which at least a part of the small-diameter bar-shaped portion of the inner diameter machining tool is rotated with respect to the inner diameter machining tool. A step of inserting into the hole, a step of injecting cutting oil into one of the cutting edge side passage and the back side passage as a cutting oil introduction passage, and the cutting edge to the work material. Cutting the work material by abutting, and discharging the cutting oil and chips as a cutting oil and chip discharge path from the other of the blade edge side passage and the back side passage. It is characterized by that.

  According to this configuration, in the inner diameter processing, two passages of cutting oil or chips can be generated around the shank provided in the small-diameter rod-like portion. Then, either one of the passages can be used as a cutting oil introduction path, and the other can be used as a cutting oil and chip discharge path, thereby enabling smooth cutting oil circulation and chip discharge.

  As described above, the inner diameter machining tool of the present invention can generate two passages of cutting oil or chips around the shank provided in the small-diameter rod-like portion in the inner diameter machining. Then, either one of the passages can be used as a cutting oil introduction path, and the other can be used as a cutting oil and chip discharge path, thereby enabling smooth cutting oil circulation and chip discharge.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 (a) shows a throw-away tip (hereinafter abbreviated as a tip) 1 as an inner diameter machining tool of the present invention, and FIG. 1 (b) is a view in the direction of arrow X in FIG. c) It is AA sectional drawing of the small diameter rod-shaped part 3. FIG.

  As shown in FIG. 1, in the tip 1, a small-diameter bar-like portion 3 is integrally projected from the peripheral surface of a flat plate-like base 2, and a cutting edge portion 4 is provided at the tip of a cylindrical shank 3 a provided in the small-diameter rod-like portion 3. Is provided.

A rake face 6 is formed on the cutting edge portion 4, and one end of a cutting edge ridge 7 provided on the cutting edge portion 4 protrudes to the side of the shank 3 a of the small-diameter bar-shaped portion 3.

  Further, in the small-diameter bar-shaped portion 3, a notch plane 8 extending in the longitudinal direction of the small-diameter rod-shaped portion 3 is formed on the peripheral surface 5 opposite to the side from which one end of the cutting edge ridge 7 is projected.

  With the above-described configuration, the small-diameter rod-like portion 3 can be inserted into the workpiece hole, and the inside of the extremely small-diameter hole can be processed like an earpick.

  The important point in the structure of the tip 1 is that the small-diameter rod-shaped portion 3 has a longitudinal direction on the circumferential surface 5 on the opposite side (back side) with respect to the side from which one end of the cutting edge ridge 7 protrudes. That is, a cut-out plane 8 extending in the direction is formed.

  This point will be described in detail with reference to FIG.

  As shown in FIG. 1 (c), the tip edge 7 protrudes from the peripheral surface 5 of the small-diameter bar-shaped part 3 between the peripheral surface 5 of the small-diameter bar-shaped part 3 of the chip 1 and the inner wall of the work hole. There are provided a passage 9a (hereinafter abbreviated as a blade edge side passage) and a passage 9b (hereinafter abbreviated as a back side passage) formed by a notch plane 8 provided on the back side from the center line C of the cross section. 2A, when the cutting oil is injected into the workpiece hole from the cutting edge side passage 9a, the cutting oil passes through the cutting edge side passage 9a and is generated at the cutting edge. Are simultaneously discharged from the back edge 9b together with chips generated during machining from the cutting edge 7. Since the passages 9a and 9b (circulation path) are located with the small-diameter rod-shaped portion 3 interposed therebetween, the cutting oil and chips are smoothly discharged without being interrupted by the injected cutting oil and discharged to the chips. Is possible. In addition, as shown in FIG.2 (b), when cutting oil is inject | poured in the workpiece | work hole from the said back side, it will become a circulation path opposite to the above.

  The shank 3a of the small-diameter rod-shaped portion 3 has a cylindrical shape. Here, a cross-sectional secondary moment is given as an index representing the rigidity of the shank 3a of the small-diameter rod-shaped portion 3.

  Although the tip 1 has a cut-out plane 8 formed on the peripheral surface 5 of the cylindrical shank 3a, the vertical direction of the cross-section (one end of the cutting edge ridge) is obtained when an approximately perfect elliptical cross-section second moment is used. The direction perpendicular to the direction in which the portion protrudes: the length in the vertical direction in FIG. 1C is 2 s, and the length in the horizontal direction (the direction in which one end of the cutting edge is protruded): FIG. ) In the horizontal direction) is 2t, the second moment of inertia of the ellipse is expressed as π · s3 · t / 4. In other words, the length in the vertical direction is multiplied by the third power and the length in the horizontal direction is multiplied by the first power, contributing to the moment of inertia of the cross section. Increasing the length in the vertical direction increases the length in the horizontal direction. The cross-sectional secondary moment can be made larger than the increase.

  Therefore, by providing the notch plane 8 on the back side and increasing the length in the vertical direction, it is possible to minimize a decrease in the rigidity of the small-diameter bar-shaped portion 3 due to the provision of the notch plane 8. On the other hand, since the decrease in rigidity is small, the amount of notches (notch plane 8) can be increased, so that the flowability or dischargeability of cutting oil or chips can be improved.

  Next, in the cross section perpendicular to the longitudinal direction of the shank 3a, the ratio T2 / T1 of the width T1 in the direction in which one end of the cutting edge ridge 7 projects and the direction T2 perpendicular thereto is 1.0-1. It is preferable to be within the range of 2. If this ratio T2 / T1 is less than 1.0, the discharge of cutting oil and chips may be deteriorated. On the other hand, if it exceeds 1.2, the cross-sectional area of the shank 3a may be reduced and the rigidity may be impaired.

  Similarly, the ratio S / T1 between the width S of the small-diameter bar-shaped portion 3 where the cutting edge ridge 7 protrudes and the width T1 where one end of the cutting edge ridge 7 protrudes to the side of the shank 3a. Is preferably 0.1 to 0.2.

  When this ratio S / T2 is less than 0.1, the discharge of cutting oil and chips may be deteriorated. On the other hand, when the ratio S / T2 is more than 0.2, the cross-sectional area of the shank 3a may be reduced and the rigidity may be impaired.

  Moreover, it is preferable that ratio F / T2 of the width | variety T2 of the direction orthogonal to the direction which protruded the width F of the said notch plane 8 and the one edge part of the said cutting-edge ridge 7 is 0.3-0.7. .

  If this ratio F / T2 is less than 0.3, the discharge of cutting oil and chips may be deteriorated. On the other hand, if it exceeds 0.7, the cross-sectional area of the shank 3a may be reduced and the rigidity may be impaired.

  As mentioned above, although embodiment of this invention was illustrated based on drawing, this invention is not limited to the said embodiment, It cannot be overemphasized that it can be set as arbitrary shapes unless it deviates from the objective of invention.

  For example, in this embodiment, a small-diameter bar-like portion 3 is integrally projected from the peripheral surface of the flat-plate base 2, and a chip provided with the flat-plate base 2 as a fixing portion to a tool holder (not shown) is used. Although explained, the present invention is not limited to this, for example, a cylindrical mounting portion is provided as a fixing portion to the tool holder, and this mounting portion is inserted and fixed in the tool mounting hole of the tool holder provided with the tool mounting hole. The inner diameter machining tool may be used.

(A) is a top view of the chip | tip as an internal diameter processing tool of this invention, (b) is a X arrow directional view of (a), (c) is AA sectional drawing of a small diameter rod-shaped part. It is explanatory drawing of the cutting process using the chip | tip of FIG. It is sectional drawing of the small diameter rod-shaped part of the conventional tool for internal diameter processing. It is explanatory drawing of the cutting using the conventional tool for internal diameter processing of FIG.

Explanation of symbols

1: (Throw away) insert / Inner diameter machining tool 2: Flat base / Tool holder mounting part 3: Small diameter bar 3a: Shank 4: Cutting edge 5: Peripheral surface 6: Rake face 7: Cutting edge 8: Notch flat surface 9a: Cutting edge side passage 9b: Back side passage T1: Width in a direction in which one end portion of the cutting edge is protruded T2: In a direction orthogonal to a direction in which one end portion of the cutting edge is protruded Width S: One end of the cutting edge ridge projects to the side of the shank Width F: Length of the flat surface of the notch C: Center line of the section

Claims (8)

An inner diameter machining tool comprising an attachment part to a tool holder and a small-diameter bar-like part continuous to the attachment part,
The small-diameter rod-shaped portion includes a shank provided on the attachment portion side, and a cutting edge portion provided at the tip of the shank,
The cutting edge portion includes a cutting edge ridge provided with one end projecting to the side of the shank, and a rake face provided continuously to the cutting edge ridge,
At least the shank of the small-diameter bar-shaped part includes a notch plane extending in the longitudinal direction of the small-diameter bar-shaped part on the peripheral surface located on the side where one end of the cutting edge ridge protrudes.
The cutting edge is formed such that a cutting edge or a passage through which cutting oil or cutting oil passes is provided on the side where one end of the cutting edge is protruded in the small-diameter bar-shaped portion,
The notch plane is formed so that a back-side passage through which chips or cutting oil passes is provided on the opposite side to the side where one end of the cutting edge is protruded in the small-diameter bar-shaped portion. An inner diameter machining tool. The rake face is composed of a plurality of faces,
Chips are discharged to the back side passage formed on the opposite side of the first rake face continuous to the cutting edge ridge of the plurality of faces from the side where one end of the cutting edge ridge is projected. The inner diameter machining cutting tool according to claim 1, wherein the inner diameter machining tool is formed as described above.   3. The inner diameter machining tool according to claim 2, wherein the notch plane is formed so as to intersect with at least one of the rake faces composed of the plurality of faces.   4. The inner diameter machining tool according to claim 2, wherein the notch plane is formed so as to intersect the first rake face.   The first rake face is opposite to the peripheral surface of the cutting edge located on the side where one end of the cutting edge is protruded and the side where one end of the cutting edge is protruded. 5. The inner diameter machining tool according to claim 2, wherein the inner diameter machining tool is formed so as to intersect with a peripheral surface of the cutting edge portion located at the center.   The first rake face has a dimension in the longitudinal direction of an intersecting ridge line with a peripheral surface of the cutting edge located on the side where one end of the cutting edge is protruded, and one end of the cutting edge 6. The dimension in the longitudinal direction of the intersecting ridge line with the peripheral surface of the cutting edge portion located on the opposite side to the side from which the protrusion is protruded is substantially the same. Tool for inner diameter machining.   The said 1st rake face is formed so that the dimension in the said longitudinal direction may become substantially the same along the other end part from the one end part of the said cutting-edge ridge. Inner diameter machining tool. Inserting at least a part of the small-diameter bar-shaped portion of the inner diameter machining tool according to any one of claims 1 to 7 into a hole of a work material rotating with respect to the inner diameter machining tool;
A step of injecting cutting oil as a cutting oil introduction path into one of the blade edge side path and the back side path; and
Cutting the work material by bringing the cutting edge into contact with the work material; and
And a step of discharging cutting oil and chips as a discharge path for cutting oil and chips from the other of the blade edge side passage and the back surface side passage.

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