JP2016137546A - Rack cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rack cutter capable of sufficiently supplying cutting oil to a blade edge which is a machining point and a chip generating point, while suppressing a supply volume of the cutting oil.SOLUTION: A rack cutter 1 used for gear-cutting a gear blank includes: a rack tooth 12 having a front surface 12a facing the front side in a cutter feed direction at gear-cutting, and a left tooth surface 12c and a right tooth surface 12d formed on both left and right side parts of the front surface 12a; a pair of left and right cutting blades 13, 14 respectively provided at a corner part formed of the front surface 12a and the left tooth surface 12c and a corner part formed of the front surface 12a and the right tooth surface 12d; and a cutting oil supply member 21 provided on the front surface 12a, and having a plurality of supply passages 21b for supplying the cutting oil flowing therein from the inside of the rack tooth 12a toward blade edges 13c, 14c of the cutting blades 13, 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rack cutter that can supply cutting oil from the inside of a tool toward a cutting edge.

  Conventionally, gear cutting tools such as hobbs and pinion cutters have been used for gear cutting of gear materials. In general, in the gear machining method using such a gear machining tool, the cutting edge of the gear machining tool or the gear material is used for the purpose of cooling the tool and the gear material and improving the chip discharging property. Cutting oil is supplied toward the workpiece.

  In addition to the method of supplying cutting oil from the machine side to the cutting edge and the processed part, the cutting oil is supplied from the inside of the tool toward the cutting edge and the processed part. Is provided. Such a conventional gear machining tool that can supply cutting oil from the inside of the tool is disclosed in, for example, Patent Document 1.

JP-A-8-71835

  However, in the conventional gear machining tool, the cutting oil sprayed from the inside of the tool is supplied to the entire cutting edge, and the supply of the cutting oil is widespread. Thereby, in the conventional gear machining tool, not only the supply amount of cutting oil is increased more than necessary, but also the cutting oil cannot be sufficiently supplied to the cutting edge serving as a processing point and a chip generation point. There is a fear.

  Therefore, the present invention solves the above-described problem, and provides a rack cutter that can sufficiently supply cutting oil to a cutting edge serving as a processing point and a chip generation point while suppressing a supply amount of cutting oil. The purpose is to provide.

The rack cutter according to the first invention for solving the above-mentioned problems is
A rack cutter used for gear cutting gears,
A rack tooth having a front surface facing the front side in the cutter feed direction at the time of gear cutting, and a left tooth surface and a right tooth surface formed on both left and right sides of the front surface;
A pair of left and right cutting edges provided at a corner formed by the front surface and the left tooth surface, and a corner formed by the front surface and the right tooth surface;
A cutting oil supply member provided on the front surface and having a plurality of supply passages for supplying the cutting oil flowing in from the inside of the rack teeth toward the cutting edges of the pair of left and right cutting edges.

The rack cutter according to the second invention for solving the above-mentioned problems is
The supply passage extends radially from the cutting oil supply member toward the cutting edge.

A rack cutter according to a third invention for solving the above-mentioned problems is as follows.
The cutting oil supply member is
Formed at the tip of the supply passage, having a supply hole for supplying cutting oil toward the cutting edge,
The position of the supply hole in the toothpaste direction is set to a position sandwiched between the pair of left and right cutting edges from the left and right sides of the tooth thickness direction.
It is characterized by that.

A rack cutter according to a fourth invention for solving the above-described problems is as follows.
The position in the toothpaste direction of the supply hole is set in accordance with a longitudinal gear cutting use range in the cutting edge.

A rack cutter according to a fifth invention for solving the above-mentioned problem is as follows.
The cutting oil supply member is detachably attached to the front surface of the rack tooth.

  Therefore, according to the rack cutter according to the present invention, by forming a plurality of supply passages in the cutting oil supply member provided on the front surface of the rack teeth, the cutting point and the chip generation point are suppressed while suppressing the supply amount of the cutting oil. The cutting oil can be sufficiently supplied to the cutting edge.

1 is a front perspective view of a rack cutter according to a first embodiment of the present invention. 2A and 2B show details of the rack cutter according to the first embodiment of the present invention, in which FIG. 1A is a front view of the rack cutter, and FIG. 1B is a side view of the rack cutter. It is a principal part enlarged view of the rack cutter which concerns on 1st Example of this invention. It is a principal part enlarged view of the rack cutter which concerns on 2nd Example of this invention. It is a principal part enlarged view of the rack cutter which concerns on 3rd Example of this invention. It is a principal part enlarged view of the rack cutter which concerns on 4th Example of this invention.

  Hereinafter, a rack cutter according to the present invention will be described in detail with reference to the drawings. In addition, the dashed-two dotted line described in the figure has shown the supply direction (flow direction) of the cutting oil.

  First, a first embodiment will be described with reference to FIGS.

  The rack cutter 1 shown in FIGS. 1 to 3 is, for example, a rack-type gear machining tool for cutting gear material into a helical gear, and can be mounted on a gear planar machine. In other words, in the gear planer machine, the gear material that the rack cutter 1 is stationary in the gear cutting process is selected, and the gear material is rotated while the rack cutter 1 is retracted from the gear material in the cutter returning process. ing.

  As shown in FIGS. 1 to 3, the rack cutter 1 includes a cutter body 11, rack teeth 12, cutting edges 13 and 14, and a cutting oil supply member 21.

  The cutter body 11 can be mounted on the gear planar processing machine described above. The rack tooth 12 is a single tooth having the same helix angle as that of the gear material (helical gear) after gear cutting, and includes a front face 12a, a flank face 12b, a left tooth face 12c, and It has a right tooth surface 12d.

  Here, the front surface 12a is a surface that faces the front side of the cutter feeding direction (tooth cutting direction) during gear cutting. Furthermore, the left tooth surface 12c and the right tooth surface 12d are surfaces facing the left tooth surface and the right tooth surface of the gear material (helical gear) at the time of gear cutting, respectively.

  A pair of left and right cutting edges 13 and 14 are detachably attached to the left and right side portions of the front surface 12a of the rack tooth 12 by bolts or the like.

  The cutting edge 13 is for cutting the left tooth surface of the gear material, and is attached to the tip side corner formed by the front surface 12a, the flank surface 12b, and the left tooth surface 12c. The cutting edge 13 is formed with a rake face 13a, a flank face 13b, and a cutting edge 13c.

  The rake face 13a is adjacent to the front face 12a and faces the same direction as the front face 12a. The flank face 13b is adjacent to the left tooth face 12c and is the same as the direction to which the left tooth face 12c faces. Facing the direction. The tip corner formed by the rake face 13a and the flank face 13b constitutes the cutting edge 13c.

  On the other hand, the cutting edge 14 is for cutting the right tooth surface of the gear material, and is attached to the tooth tip side corner formed by the front surface 12a, the flank surface 12b, and the right tooth surface 12d. . The cutting edge 14 has a rake face 14a, a flank face 14b, and a cutting edge 14c.

  The rake face 14a is adjacent to the front face 12a and faces the same direction as the front face 12a. The flank face 14b is adjacent to the right tooth face 12d and is the same as the direction of the right tooth face 12d. Facing the direction. The tip corner formed by the rake face 14a and the flank face 14b constitutes the cutting edge 14c.

  Further, a cutting oil supply member 21 is detachably attached to the front surface 12a of the rack tooth 12 with a bolt or the like. The cutting oil supply member 21 is disposed inside the outer edge portion of the front surface 12a, and has a trapezoidal shape that follows the outline of the front surface 12a having a triangular shape. In the cutting oil supply member 21, a diverting portion 21a and a plurality of supply passages 21b through which cutting oil can flow are formed.

  The flow dividing portion 21 a is an internal space formed in the central portion of the cutting oil supply member 21. The supply passage 21b extends radially from the flow dividing portion 21a toward the cutting edges 13c and 14c of the cutting edges 13 and 14 with the central portion of the flow dividing portion 21a as the center, and the downstream end portion in the cutting oil flow direction A supply hole 21c is opened toward the cutting edges 13c and 14c in the (tip portion). At this time, the position in the toothpaste direction of the supply hole 21c is set to a position sandwiched between the cutting edges 13 and 14 from the left and right sides in the tooth thickness direction.

  On the other hand, a supply passage 11 a through which cutting oil can flow is formed in the cutter body 11, and a supply passage 12 e through which cutting oil can flow is formed in the rack teeth 12. . The supply passage 11a communicates with a cutting oil supply device attached to the gear planar processing machine when the cutter body 11 is mounted on the gear planar processing machine. The supply passage 12e communicates with the supply passage 11a and the branching portion 21a.

  As described above, when the cutting oil supply device is driven, the supply of the cutting oil is started, and the cutting oil fed from the cutting oil supply device is supplied to the supply passage 11a of the cutter body 11 and the supply passage of the rack teeth 12. It flows into the flow dividing part 21a of the cutting oil supply member 21 through 12e.

  Then, the cutting oil that has flowed into the diverting portion 21a is diverted into the respective supply passages 21b and then injected from the respective supply holes 21c. Next, the cutting oil sprayed from each supply hole 21 c is directly supplied to the cutting edges 13 c and 14 c of the cutting edges 13 and 14.

  Therefore, since the cutting oil can be directly supplied only to the cutting edges 13c and 14c, the cutting oil is sufficiently supplied to the cutting edges 13c and 14c serving as machining points and chip generation points while suppressing the supply amount of the cutting oil. Can be supplied to.

  In the first embodiment described above, the cutting oil supply member 21 is employed as a configuration for supplying the cutting oil to the cutting edges 13c, 14c of the cutting blades 13, 14, but this cutting oil supply member 21 is used. Instead, for example, the cutting oil supply members 22 to 24 according to the second to fourth embodiments shown below may be employed.

  First, FIG. 4 shows a cutting oil supply member 22 according to the second embodiment. As shown in FIG. 4, in the cutting oil supply member 22, a flow dividing portion 22 a and a plurality of supply passages 22 b through which cutting oil can flow are formed.

  The flow dividing portion 22 a is an internal space formed in the central portion of the cutting oil supply member 21. Further, the supply passage 22b extends radially from the flow dividing portion 22a toward the cutting edges 13c and 14c of the cutting blades 13 and 14 with the central portion of the flow dividing portion 22a as the center, and the downstream end portion in the cutting oil flow direction A supply hole 22c opens toward the blade edges 13c and 14c at the (tip portion).

  At this time, the tip of the cutting oil supply member 22 extends so as to greatly enter between the cutting edges 13 and 14 in the toothing direction, and the position in the toothing direction of the supply hole 22c provided at the tip is It is set at a position sandwiched between the cutting edges 13 and 14 from the left and right sides in the tooth thickness direction.

  Accordingly, since the supply hole 22c can be made closer to the cutting edges 13 and 14, the directivity of the supply hole 22c with respect to the cutting edges 13c and 14c can be improved. Therefore, the cutting oil can be supplied to the entire length direction of the cutting edges 13c and 14c.

  FIG. 5 shows a cutting oil supply member 23 according to the third embodiment. As shown in FIG. 5, in the cutting oil supply member 23, a flow dividing portion 23 a and a plurality of supply passages 23 b through which the cutting oil can flow are formed.

  The flow dividing portion 23 a is an internal space formed in the central portion of the cutting oil supply member 23. The supply passage 23b extends radially from the flow dividing portion 23a toward the cutting edges 13c and 14c of the cutting edges 13 and 14 with the central portion of the flow dividing portion 23a as the center, and the downstream end portion in the cutting oil flow direction. A supply hole 23c is opened toward the cutting edges 13c and 14c at the (tip portion).

  At this time, the oil passage sectional area of the cutting oil supply passage 23b and the opening sectional area of the supply hole 23c are increased. Thereby, the supply amount of the cutting oil supplied to the blade edges 13c and 14c can be easily increased.

  FIG. 6 shows a cutting oil supply member 24 according to the fourth embodiment. As shown in FIG. 6, in this cutting oil supply member 24, a first supply passage 24a, a flow dividing portion 24b, and a second supply passage 24c through which cutting oil can flow are formed.

  The first supply passage 24 a communicates with the supply passage 12 e of the rack teeth 12. Further, the flow dividing portion 24 b is an internal space formed in the central portion of the cutting oil supply member 24. Further, the second supply passage 24c extends radially from the flow dividing portion 24b toward the cutting edges 13c and 14c of the cutting edges 13 and 14 with the central portion of the flow dividing portion 24b as the center, and the downstream side in the cutting oil flow direction. A supply hole 24d is opened at the end (tip) toward the cutting edges 13c and 14c.

  At this time, the distal end portion of the cutting oil supply member 24 extends so as to largely enter between the cutting blades 13 and 14 in the toothing direction, and the toothing direction position of the supply hole 24c provided in the distal end portion is It is set at a position sandwiched between the cutting edges 13 and 14 from the left and right sides in the tooth thickness direction. Accordingly, the supply hole 24d comes closer to the tooth tip side portion of the cutting blades 13 and 14.

  Therefore, when only the gear tip side portion of the cutting edges 13c and 14c is used, such as when gear material having a small outer diameter or gear material having a small tooth surface is cut, the longitudinal gear cutting at the cutting edges 13c and 14c is performed. Depending on the range of use, the position in the toothpaste direction of the supply hole 24d can be changed. Therefore, even when the cutting edges 13c and 14c are partially used in the longitudinal direction, the cutting oil can be supplied within the partial range.

  In the rack cutter according to the present invention, the cutting oil can be supplied from the inside of the cutter toward the cutting edge, so that it can be used extremely beneficially in improving machining accuracy and tool life and reducing cutting oil consumption. .

DESCRIPTION OF SYMBOLS 1 Rack cutter 11 Cutter main body 12 Rack tooth | gear 12a Front surface 12b Relief surface 12c Left tooth surface 12d Right tooth surface 13, 14 Cutting edge 13a, 14a Rake face 13b, 14b Relief face 13c, 14c Cutting edge 21-24 Cutting oil supply member 21a- 23a, 24b Dividing portions 21b-23b, 24a, 24c Supply passages 21c-23c, 24d Supply holes

Claims (5)

A rack cutter used for gear cutting gears,
A rack tooth having a front surface facing the front side in the cutter feed direction at the time of gear cutting, and a left tooth surface and a right tooth surface formed on both left and right sides of the front surface;
A pair of left and right cutting edges provided at a corner formed by the front surface and the left tooth surface, and a corner formed by the front surface and the right tooth surface;
A cutting oil supply member provided on the front surface, the cutting oil supply member having a plurality of supply passages for supplying the cutting oil flowing in from the inside of the rack teeth toward the cutting edges of the pair of left and right cutting edges. Cutter. The rack cutter according to claim 1, wherein
The rack cutter, wherein the supply passage extends radially from the cutting oil supply member toward the cutting edge. The rack cutter according to claim 1 or 2,
The cutting oil supply member is
Formed at the tip of the supply passage, having a supply hole for supplying cutting oil toward the cutting edge,
The position of the supply hole in the toothpaste direction is set to a position sandwiched between the pair of left and right cutting edges from the left and right sides of the tooth thickness direction.
A rack cutter characterized by that. The rack cutter according to claim 3, wherein
The rack cutter is characterized in that a position in the toothpaste direction of the supply hole is set in accordance with a longitudinal gear cutting use range in the cutting edge. The rack cutter according to any one of claims 1 to 4,
The rack cutter, wherein the cutting oil supply member is detachably attached to the front surface of the rack teeth.

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