Skiving machine

Abstract

To provide a skiving machine which, when processing an inner peripheral surface of a work-piece stop hole by skiving, can suppress adhesion of chips to a processing area and can suitably prevent tool blade chipping and work-piece processing failure.SOLUTION: A skiving machine of the present invention comprises: a gear type cutter 200 which processes an inner peripheral surface 904 of a stop hole of a work-piece 900; and a crescent type duct 140 which is inserted in a gap formed when inserting the cutter 200 into the stop hole of the work-piece 900. The duct 140 is partitioned into two chambers by a partition wall, and two chambers comprise: a suction chamber 142a having a suction port 146 on an exit side of a cutting position of the cutter 200; and a blow-out chamber 142b having a blow-out port 148 on an entry side of the cutting position of the cutter 200.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a skiving machine in which a gear-shaped cutter is held at the tip of a holder. [Background technology]

[0002] Skiving is a well-known machining method for creating gears. Skiving is performed by synchronizing the rotation of the skiving cutter, a cutting tool, with the rotation of the workpiece, which is the object to be machined, while tilting the rotation axis of the skiving cutter (cutter axis) relative to the rotation axis of the workpiece (work axis). This creates a difference between the rotation direction of the workpiece and that of the skiving cutter, causing "slip" when the skiving cutter interferes with the workpiece. This slip is used to remove the interfering parts from the workpiece, and to machine tooth grooves and other features into the workpiece.

[0003] Like normal cutting, skiving is performed while supplying fluids such as coolant (cooling liquid) or air (blower) for lubrication and cooling. Among these, processing performed while supplying air (blower) is called dry processing. For example, Patent Document 1 discloses a dust collector for machine tools as a technology for dry processing, although it is not skiving.

[0004] The dust collector for machine tools in Patent Document 1 includes "a machining tool attached to the spindle of the machine tool, a dust collection cover that surrounds the machining tool and covers the workpiece, capturing dust generated and scattered by the operation of the machining tool, an air suction hole provided in the dust collection cover, and an air suction hose that is connected at one end to the air suction hole and at the other end to an air suction machine, and that guides the dust from the air suction hole to the air suction machine by the suction force of the air suction machine." The dust collector for machine tools in Patent Document 1 is characterized in that "the dust collection cover has a canopy side attached to the spindle and an opening on the opposite canopy side that covers the workpiece, and is shaped so that its inner diameter gradually increases toward the opening." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-126376 Summary of the Invention [Problem to be solved by the invention]

[0006] When skiving internal tooth holes into a workpiece (such as a cylindrical internal gear with a bottom), chips generated during the cutting process tend to accumulate in the internal space of the workpiece. This causes centrifugal force to cause the chips to stick to or get caught in the cutting area, resulting in problems such as chipping of the tool blade and scratches on the tooth surface of the workpiece.

[0007] According to Patent Document 1, flying dust is collected inside a dust collection cover and guided to an air suction device by an air suction hose. However, with this method, depending on the suction performance of the air suction device, the dust density inside the dust collection cover may be higher than when no cover is used. Therefore, chips are still scattered inside the cover. Furthermore, the technology in Patent Document 1 cannot prevent adverse effects such as chip adhesion to the machined area due to the centrifugal force of the workpiece's rotation.

[0008] In view of these problems, the present invention aims to provide a skiving machine that can suppress the adhesion of chips to the processing location when processing the inner surface of a blind hole in a workpiece by skiving, and can effectively prevent chipping of the tool blade and poor processing of the workpiece. [Means for solving the problem]

[0009] In order to solve the above problems, a typical configuration of the skiving machine of the present invention comprises a gear-shaped cutter that processes the inner surface of a stop hole in a workpiece, and a crescent-shaped duct that is inserted into the gap formed when the cutter is inserted into the stop hole in the workpiece, and the duct is divided into two chambers by a partition wall, and the two chambers are a suction chamber having a suction port on the exit side of the cutting position of the cutter, and an outlet chamber having an outlet on the entry side of the cutting position of the cutter.

[0010] The skiving machine may include a duct bracket that supports the duct, and a moving device to which the duct bracket is attached and that moves the duct bracket forward and backward toward the workpiece.

[0011] Alternatively, the skiving machine may include a duct bracket that attaches the duct to the tool spindle that holds the cutter. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a skiving machine that can suppress the adhesion of chips to the processing location when processing the inner surface of a stop hole in a workpiece by skiving, and can effectively prevent chipping of the tool blade and poor processing of the workpiece. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a skiving machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating a schematic example of the positional relationship between a cutter and a workpiece during machining. [Figure 3] FIG. 2 is a diagram illustrating a duct according to the present embodiment. [Figure 4] 5A and 5B are five-view diagrams of the duct of this embodiment. [Figure 5] 10A and 10B are diagrams illustrating a duct mounting structure in a processing machine. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown or described.

[0015] Fig. 1 is a diagram illustrating the schematic configuration of a skiving machine according to this embodiment. The skiving machine (hereinafter referred to as machine 100) of this embodiment shown in Fig. 1 machines a gear by synchronously rotating a workpiece 900 and a gear-shaped cutter 200. As shown in Fig. 1, machine 100 of this embodiment has a workpiece spindle 120, a tool spindle 130, a duct 140, the cutter 200, and a control unit 190 that controls the operations of these components.

[0016] The workpiece 900 is replaceably attached to the workpiece spindle 120, which rotates the attached workpiece 900 around the workpiece axis C. The workpiece spindle 120 of the processing machine 100 is movable in the workpiece axis direction Z, which is the axial direction of the workpiece axis C (the same direction as the Z-axis direction described below).

[0017] Specifically, the workpiece spindle 120 is placed on the fixed bed 110 via a table 122, and a Z-axis drive screw 124 is inserted into the table 122. A Z-axis drive motor 126, which is a drive source for rotating the Z-axis drive screw 124, is connected to the Z-axis drive motor 126. As a result, by driving the Z-axis drive motor 126, the Z-axis drive screw 124 rotates, and the workpiece spindle 120 on the table 122 can be moved in the Z-axis direction (i.e., the workpiece axis direction Z).

[0018] The cutter 200 is replaceably attached to the tool spindle 130, which rotates the attached cutter 200 around the tool axis B. The tool spindle 130 is also movable in the X-axis direction (a direction moving toward and away from the work axis C in a horizontal direction: the front-to-back direction in the drawing) and the Y-axis direction (a direction moving toward and away from the work axis C in a vertical direction: the up-to-down direction in the drawing), and is also rotatable in the A-direction (rotation in a vertical plane parallel to the tool axis B).

[0019] 1, a holder 132 that holds a gear-shaped cutter 200 at its tip is attached to the tool spindle 130. That is, the cutter 200 is attached to the tool spindle 130 via the holder 132.

[0020] Fig. 2 is a diagram illustrating a schematic example of the positional relationship between the cutter 200 and the workpiece 900 during machining. Fig. 2(a) is a cross-sectional view of the cutter 200 and the workpiece 900. Fig. 2(b) is a view of the cutter 200 and the workpiece 900 as seen from the arrow A. Fig. 2(c) is a diagram illustrating a schematic example of the movement of the cutter 200 and the workpiece 900 during machining.

[0021] 1 and 2, in this embodiment, a gear-shaped cutter 200 is used to machine an inner peripheral surface 904 of a blind hole in a workpiece 900. In detail, the workpiece 900 is cylindrical as shown in FIGS. 2(b) and (c), and has a bottom 906 as shown in FIG. 2(a).

[0022] When machining the inner peripheral surface 904 of the workpiece 900 into a gear shape using the cutter 200, the cutter 200 is inserted into a stopper hole in the workpiece 900, and the inner peripheral surface 904 is cut by the cutter 200, as shown in FIGS. 2(a) to 2(c). At this time, if the cutter 200 is simply inserted into the stopper hole in the workpiece 900, a crescent-shaped gap 910 is created between the cutter 200 and the workpiece 900. This causes chips 908 to scatter into the gap 910, resulting in the chips 908 adhering to the machined portion of the inner peripheral surface 904 of the workpiece 900.

[0023] Fig. 3 is a diagram illustrating the duct 140 of this embodiment. Fig. 3(a) is a diagram illustrating a state in which the duct 140 is arranged in Fig. 2(c). Fig. 3(b) is a diagram illustrating a state in which the duct 140 is arranged in Fig. 2(a). Fig. 4 is a five-view diagram of the duct 140 of this embodiment.

[0024] 3(a) and 3(b), in this embodiment, a crescent-shaped duct 140 is inserted into a crescent-shaped gap 910 formed when a cutter 200 is inserted into a stop hole in a workpiece 900. As shown in FIGS. 3 and 4, the duct 140 includes a crescent-shaped main body 142 and a partition wall 144 that divides the main body 142 into two chambers (a suction chamber 142a and a blowing chamber 142b).

[0025] The suction chamber 142a is connected to a suction pump (not shown) via a suction hose 147. A suction port 146 provided in the suction chamber 142a opens to the end face of the crescent-shaped tip, and is located on the exit side of the cutting position of the cutter 200. The blowout chamber 142b is connected to a blower (not shown) via a blower hose 149. A blowout port 148 provided in the blowout chamber 142b opens to the outer peripheral surface of the crescent-shaped tip, and blows air onto an inner peripheral surface 904 of the workpiece 900 on the entry side of the cutting position of the cutter 200.

[0026] According to the above configuration, the gap 910 in the workpiece 900 is filled with the duct 140, which makes it possible to suitably prevent the scattering of chips 908 in the gap 910. Furthermore, by immediately sucking the chips generated at the cutting position of the cutter 200 from the suction port 146 into the suction chamber 142a, the scattering of chips 908 can be more efficiently prevented.

[0027] Furthermore, by blowing air from the air outlet 148, it is possible to remove chips 908 adhering to the inner peripheral surface 904 immediately before cutting. Therefore, according to the processing machine 100 of this embodiment, when processing the inner peripheral surface 904 of the blind hole in the workpiece 900 by skiving, it is possible to suppress the adhesion of chips 908 to the processing location and effectively prevent chipping of the cutter 200 and processing defects in the workpiece 900.

[0028] Figure 5 is a diagram illustrating the mounting structure of the duct 140 in the processing machine 100. Figure 5(a) is a diagram illustrating the mounting structure of the duct 140 in Figure 1. Figure 5(b) is a diagram illustrating another example of the mounting structure of the duct 140.

[0029] 1 and 5(a), the duct 140 is supported by a duct bracket 150. The duct bracket 150 is attached to a moving device 180 such as an air cylinder, and can move toward and away from the workpiece 900. The moving device 180 is installed on a frame 112 provided on the fixed bed 110.

[0030] According to this configuration, the duct bracket 150 can be advanced or retreated toward the workpiece 900 (in the Z-axis direction) by driving the moving device 180. Therefore, the duct 140 can be inserted into or removed from the fastening hole of the workpiece 900.

[0031] In the example shown in Fig. 5(b), the duct 140 is attached to the tool spindle 130 that holds the cutter 200 via a duct bracket 160. With this configuration, the duct 140 operates in conjunction with the tool spindle 130. With this configuration, it is possible to obtain the same effect as the configuration in Fig. 5(a).

[0032] While 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 these examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that these modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0033] The present invention can be used in a skiving machine in which a gear-shaped cutter is held at the tip of a holder. [Explanation of symbols]

[0034] 100...machine, 110...fixed bed, 112...frame, 120...work spindle, 122...table, 124...Z-axis drive screw, 126...Z-axis drive motor, 130...tool spindle, 132...holder, 140...duct, 142...main body, 142a...suction chamber, 142b...blowing chamber, 144...partition wall, 146...suction port, 147...suction hose, 148...blowing port, 149...blower hose, 150...duct bracket, 160...duct bracket, 180...moving device, 190...control unit, 200...cutter, 900...work, 904...inner surface, 906...bottom, 908...chips, 910...gap

Claims

1. a gear-shaped cutter for machining the inner surface of a stop hole in a workpiece; a crescent-shaped duct that is inserted into a gap formed when the cutter is inserted into a stop hole in the workpiece; Equipped with The duct is divided into two chambers by a partition wall, The two chambers are: a suction chamber having a suction port on the cutting position release side of the cutter; an air outlet chamber having an air outlet on the inlet side of the cutting position of the cutter; A skiving machine characterized by:

2. a duct bracket for supporting the duct; The skiving machine according to claim 1, further comprising a moving device to which the duct bracket is attached and which moves the duct bracket toward and away from the workpiece.

3. The skiving machine according to claim 1, further comprising a duct bracket for attaching the duct to a tool spindle that holds the cutter.

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