JP2019042833A - Skiving processing machine - Google Patents

Abstract

To provide a skiving processing machine that efficiently removes cutting chips of a workpiece from a skiving cutter so that no cutting chip is caught in at a cutting position.SOLUTION: In a skiving processing machine 100 having a gear type skiving cutter 102 held atop of a holder 106, the holder 106 comprises: a center flow passage 120 for allowing a fluid to flow into the holder 106; a branch flow passage 122 for allowing the fluid to flow radially outward from the center flow passage 120; a ring-shaped flow passage 126 for allowing the fluid, having flowed from the branch passage 122, to flow circumferentially; and a plurality of discharge holes 128 for discharging the fluid from the ring-shaped flow passage 126 toward blades 103 of the skiving cutter 102.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a skiving machine.

  Skiving is known as a machining method for turning an internal gear or the like. The skiving process is performed by inclining the rotation axis of the tool with respect to the rotation axis of the workpiece while synchronizing the rotation of the workpiece and the rotation of the tool. This causes a difference between the direction of rotation of the workpiece and the direction of rotation of the tool, causing a "slip" when the tool is caused to interfere with the workpiece. Using this slippage, the interference portion is removed from the workpiece to process the tooth gaps and the like on the workpiece. Such skiving is currently implemented as a function of a multi-tasking machine as well as other turning and drilling processes.

  Skiving is performed while supplying a fluid such as cutting fluid, coolant (coolant), or blower (air) for lubrication, cooling, and removal of chips, as in normal cutting. . These fluids are conventionally supplied from the nozzle of an external device, but in recent skiving machines, they are supplied from a dedicated port in the vicinity of the skiving cutter. For example, in the skiving apparatus described in Patent Document 1, a supply port 35 for supplying a cutting fluid from the tip of the central portion of the skiving cutter 29 is provided.

JP, 2016-215327, A

  However, in the technique described in Patent Document 1, since the cutting fluid is supplied toward the cutting edge of the rake face of the skiving cutter 29, the tool and the work can be efficiently lubricated, but the cutting position of the skiving cutter 29 works There is a possibility that the chip of the thing bites.

  In a cutting tool used in conventional general cutting, only the tip of the cutting tool contacts the workpiece, so there is no contact surface where chips enter. Further, in the case of the conventional gear cutting tool, since the pinion cutter reciprocates along the tooth groove, no chips get in between the tool and the workpiece. However, since the skiving cutter rotates so that the tool and the teeth of the workpiece mesh with each other, chips may be caught between the tool and the workpiece. If chips are caught, the machined surface may be damaged or the cutting position may be deviated to lower the machining accuracy.

  An object of the present invention is to provide a skiving machine in which chips of a workpiece are efficiently removed from a skiving cutter and chips do not bite at a cutting position.

  In order to solve the above problems, a typical configuration of a skiving machine according to the present invention is a skiving machine in which a gear-type skiving cutter is held at the tip of the holder, the holder containing a fluid in the holder A central flow path for flowing, a branch flow path for flowing fluid radially outward from the central flow path, an annular flow path for flowing fluid flowing from the branched flow path in the circumferential direction, and teeth of the skiving cutter from the annular flow path And a plurality of discharge holes for discharging the fluid in the opposite direction.

  According to the above configuration, the chips of the workpiece can be efficiently removed from the teeth of the skiving cutter, and biting of the chips can be prevented. Therefore, it is possible to maintain high skiving accuracy.

  The discharge direction of the plurality of discharge holes may be radially inclined with respect to the axis of the holder along the teeth of the skiving cutter. This configuration enables the fluid to reach the cutting position and efficiently remove chips generated at the cutting position.

  The discharge directions of the plurality of discharge holes may be circumferentially inclined with respect to the axis of the holder along the teeth of the skiving cutter. This configuration also allows the fluid to reach the cutting position and efficiently removes chips generated at the cutting position.

  The plurality of discharge holes may have the same number of discharge holes as the teeth of the skiving cutter. Thereby, biting of chips can be efficiently prevented in each tooth.

  The skiving machine may further include a ring attached to the holder after the branch flow path is formed in the holder, and the annular flow path and the plurality of discharge holes may be formed in the ring. Thereby, the branch flow passage, the annular flow passage, and the discharge hole can be easily formed.

  According to the present invention, it is possible to efficiently remove the chips of the workpiece from the skiving cutter and provide a skiving machine in which the chips do not get caught in the cutting position.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline | summary of the skiving processing machine concerning embodiment of this invention. It is sectional drawing and an exploded view of a tooling part. It is a figure showing the posture at the time of operation of a tooling part.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and the invention is not limited except as otherwise described. In the specification and the drawings, elements having substantially the same functions and configurations will be denoted by the same reference numerals to omit repeated descriptions, and elements not directly related to the present invention may be illustrated or described. Omit.

  FIG. 1 is a schematic view of a skiving machine 100 according to an embodiment of the present invention. FIG. 1A shows the entire skiving machine 100. The skiving machine 100 is a machine tool that skives a workpiece (workpiece 104) by the rotating skiving cutter 102. The skiving cutter 102 is attached to the tool spindle 108 via a holder 106. The workpiece 104 is placed on the workpiece spindle 110 and is processed while being synchronized with the skiving cutter 102 and rotated. The tool spindle 108 can pivot in each direction such as front, rear, up, down, left, and right, and the workpiece spindle 110 can also be moved back and forth.

  FIG. 1B shows the tooling portion 114 at the tip of the tool spindle 108 in an enlarged manner. In the tooling unit 114, the skiving cutter 102 is held at the tip of the holder 106. The skiving cutter 102 is gear-shaped and has teeth on its outer periphery, and is held by the holder 106 using a holding bolt 116. The holder 106 is connected to the tool spindle 108 via the underlying pull stud 118.

  FIG. 2 is a cross-sectional view and an exploded view of the tooling portion 114. As shown in FIG. FIG. 2A is a partial cross section of the tooling portion 114. The holder 106 is a so-called center-through type provided with a central flow passage 120 through which a fluid such as a coolant flows in the center of the inside. The central flow passage 120 is provided at the center of the holder 106 along the axis L1 (rotational axis) of the holder 106 from the pull stud 118 side toward the skiving cutter 102 side.

  As the fluid to be supplied to the central flow passage 120, in addition to the coolant (coolant), various fluids commonly used for lubrication of cutting fluid, blower (air), oil mist, etc., cooling and chip removal are used. Liquids and gases can be used.

  At the tip of the central flow passage 120, a branch flow passage 122 is provided. The branch flow passage 122 is a lateral hole branched from the central flow passage 120 and extends radially outward of the holder 106. The branch flow channel 122 is a flow channel that sends the fluid to an annular flow channel 126 described later, and the number is not limited. However, in the case where a plurality of branch flow channels are provided, it is preferable to arrange them evenly in the circumferential direction.

  The fluid sent from the branch flow channel 122 flows into the annular flow channel 126 formed by the ring 124. The ring 124 is a member formed in an annular shape, and is fitted to the outer periphery on the tip end side of the holder 106. The outer diameter D1 of the ring 124 is set smaller than a root circle D2 formed by the bottom surfaces of the teeth of the skiving cutter 102 so that the ring does not contact the workpiece 104 (see FIG. 1A) during the skiving process. It is considered. The annular channel 126 is annularly formed by the inner recess of the ring 124 and the outer surface of the holder 106, and the fluid flowing from the branch channel 122 flows in the circumferential direction with respect to the axis L1.

  The ring 124 is provided with a plurality of discharge holes 128 from the annular flow path 126 toward the teeth 103 of the skiving cutter 102. The discharge holes 128 extend towards the individual teeth of the skiving cutter 102 to discharge fluid towards the teeth.

  FIG. 2B is a cross-sectional view of the ring 124 and the holder 106 taken along the line A-A. A large number of discharge holes 128 are formed circumferentially along the annular channel 126. With this configuration, by discharging the fluid from the plurality of discharge holes 128 toward the teeth of the skiving cutter 102, chips of the workpiece are efficiently removed from the teeth of the skiving cutter 102, and skiving is performed. It is possible to maintain high accuracy.

  The ejection holes 128 may be provided, for example, in the same number as the teeth of the skiving cutter 102 (the same number as the tooth grooves). Directly discharging the fluid from each discharge hole 128 toward the individual teeth of the skiving cutter 102 makes it possible to prevent chip biting more efficiently.

  FIG. 2C is an exploded view of the tooling portion 114. FIG. As described above, in the present embodiment, the annular flow passage 126 and the discharge hole 128 are provided in the ring 124. The ring 124 is fitted to the tip of the holder 106 and attached to the holder 106 by the spacer 130 and the holding bolt 116 after the skiving cutter 102 is attached. The annular flow passage 126 is formed in a recessed shape on the inner circumferential surface of the annular ring 124, and by attaching the ring 124 to the holder 106, the annular flow passage 126 is configured to be continuous with the branch flow passage 122.

  In the present embodiment, the annular flow path 126 and the plurality of discharge holes 128 are formed in the ring 124 which is a separate member from the holder 106, thereby facilitating the manufacture of the tooling portion 114. However, the ring 124 need not necessarily be provided, and the annular channel 126 and the plurality of discharge holes 128 may be provided in the holder 106 itself.

  Refer back to FIG. 2 (a). The diameter of the skiving cutter 102 gradually increases from the tool spindle side toward the tip (angle α) so as to be divergent (reversely tapered) toward the cutting edge. Therefore, in the present embodiment, the discharge direction of the discharge hole 128 is also inclined at the same angle α with respect to the axis L1 of the holder 106 in the radial direction. That is, the plurality of discharge holes 128 extend from the annular flow passage 126 in a diverging manner. This allows the fluid to flow parallel to the tooth lines, efficiently causing the fluid to reach the cutting position, and efficiently removing the chips generated at the cutting position.

  In the case of a tapered skiving cutter, the plurality of discharge holes 128 may also be inclined so as to be tapered from the annular flow passage 126.

  FIG. 3 is a view showing the attitude of the tooling unit 114 during operation. The skiving cutter 102 is a helical gear type, and the teeth 103 are circumferentially inclined at an angle β with respect to the axis L 1 of the holder 106. This is because, in the skiving process, the skiving cutter 102 is in contact with the workpiece 104 in an oblique posture, and is a configuration for processing an internal gear (teeth 105) along the vertical direction on the workpiece. Therefore, the plurality of discharge holes 128 are also circumferentially inclined at the same angle β with respect to the axis L1 of the holder 106 so that the discharge direction is along the teeth of the skiving cutter 102. With this discharge hole 128, even the helical gear type skiving cutter 102 can discharge the fluid in parallel with the teeth, and the fluid reaches the cutting position and chips generated at the cutting position Can be removed more efficiently.

  As described above, according to the skiving machine 100 according to the present embodiment, the fluid can be discharged from the short distance on the holder 106 side toward the teeth 103 of the skiving cutter 102 in parallel with the teeth. Further, by discharging the fluid to a position other than the rake face of the teeth 103 of the skiving cutter 102, the chips of the workpiece are efficiently removed from the skiving cutter 102, and biting of the chips at the cutting position is achieved. It is possible to prevent skiving processing with high accuracy.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. It is understood.

  For example, in the above embodiment, the number of discharge holes 128 has been described as the same as the number of teeth 103 of the skiving cutter 102, but may be smaller than this. Also, although the direction of the discharge hole 128 is inclined at the angle α in the radial direction along the direction of the teeth 103 of the skiving cutter 102 and inclined at the angle β in the circumferential direction, either one may be used. Also, it does not have to be inclined in either direction.

  The present invention can be applied to a skiving machine.

100 ... Skiving machine, 102 ... Skiving cutter, 103 ... Skiving cutter teeth, 104 ... Workpieces, 105 ... Work teeth, 106 ... Holders, 108 ... Tool spindles, 110 ... Work spindles, 114 ... Tooling section, 116: holding bolt, 118: pull stud, 120: central channel, 122: branch channel, 124: ring, 126: annular channel, 128: discharge hole, 130: spacer, L1: axis of holder, D1: ring OD, D2 ... root circle of skiving cutter, α ... inclination angle in radial direction, β ... inclination angle in circumferential direction

Claims (5)

In a skiving machine in which a gear type skiving cutter is held at the tip of a holder,
The holder is
A central flow path for fluid flow into the holder;
A branch flow channel for flowing fluid radially outward from the central flow channel;
An annular flow passage for flowing the fluid flowing from the branch flow passage in the circumferential direction;
A skiving machine comprising: a plurality of discharge holes discharging fluid from the annular flow channel toward the teeth of the skiving cutter.   The skiving machine according to claim 1, wherein the discharge direction of the plurality of discharge holes is inclined in the radial direction with respect to the axis of the holder along the teeth of the skiving cutter.   3. The skiving according to claim 1, wherein the discharge directions of the plurality of discharge holes are circumferentially inclined with respect to the axis of the holder along the teeth of the skiving cutter. Processing machine.   The skiving machine according to any one of claims 1 to 3, wherein the plurality of discharge holes are formed with the same number of discharge holes as the teeth of the skiving cutter. The holder further comprises a ring attached to the holder after the branch flow channel is formed in the holder,
The skiving machine according to any one of claims 1 to 4, wherein the annular flow passage and the plurality of discharge holes are formed in the ring.

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