Built-up type skiving cutter

Abstract

To solve problems that costs for producing a special tooling are required when a special passage, such as a hole or a groove of a coolant, is provided in the tooling (a rotary shaft) for attaching a conventional skiving cutter, and every time a shape of the skiving cutter is changed, a tooling tailored to match with the shape is needed, leading to increase of the number of components prepared.SOLUTION: A built-up skiving cutter 1 of the invention includes: a body component 10 having a cutting edge 15; a processing tooth component 20 having a cutting edge 25; a processing tooth fixing component 30 which fixes the processing tooth component 20; and a tooling 40 having a through hole 41 formed along a rotation axis O and a protruding part 42 fitted in the through hole 11. The body component 10 is fixed to the tooling 40 by using a fixing bolt 50 penetrating through the through hole 11 of the body component 10. A plurality of oil passages 12, 13 are provided extending from the through hole 11 of the body component 10 in an outer peripheral direction are provided in the body component 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an assembly-type skiving cutter for machining gears by cutting. [Background technology]

[0002] Conventional skiving cutters and gear machining jigs using the same are classified into two types: a type that supplies coolant from the machine tool side, and a type that has a function for flowing coolant in the skiving cutter itself. In particular, the type that has a function for flowing coolant in the skiving cutter itself has various forms, such as discharging coolant from a discharge hole in a tooling or fastening jig as disclosed in Patent Documents 1 to 3. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-154443 A [Patent Document 2] JP 2023-007256 A [Patent Document 3] Patent Publication No. 2021-013963 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it was necessary to provide dedicated flow paths such as holes and grooves for the coolant in the tooling, which resulted in the expense of producing the dedicated tooling. In addition, when the shape of the cutter was changed, it was necessary to prepare a corresponding tooling for each cutter shape, which resulted in an increase in the number of parts to be prepared. In addition, when the cutter was used for cutting with a small diameter cutting edge, the chips were continuous from the tooth tip to the tooth base, which caused problems such as chip jamming, poor accuracy of the workpiece, and early wear of the cutter.

[0005] Therefore, an object of the present invention is to provide an assembled skiving cutter that has separate cutting edges for cutting small and large diameter portions of a workpiece, separates chips generated by cutting, and at the same time does not require coolant holes or passages in the tooling, and can be adapted with a single tooling even if the shape of the cutting edges is changed. [Means for solving the problem]

[0006] The assembled skiving cutter of the present invention has an annular main body part having a through hole in the center, a cutting tooth part having cutting edges arranged around the main body part, and a cutting tooth fixing part for fixing the cutting tooth part to the main body part, and the main body part is provided with a first cutting edge (holder cutting edge) for cutting a small diameter part of a workpiece and oil passages formed radially from the through hole toward the outer periphery. This oil passage can also be a first oil passage that leads from the through hole to the cutting tooth part and the cutting tooth fixing part in a cross section parallel to the rotation axis of the assembled skiving cutter.

[0007] The cutting teeth component is provided with a second cutting blade for cutting the large diameter portion of the workpiece. Also, the cutting teeth fixing component may be provided with a second oil passage penetrating from the rotation axis toward the outer periphery of the assembled skiving cutter in a cross-sectional view parallel to the rotation axis of the assembled skiving cutter, so that the opening of the first oil passage and the opening of the second oil passage are in close contact with each other. Furthermore, the main body component may further have a third oil passage formed radially from the through hole toward the outer periphery and longer than the second oil passage. Effect of the Invention

[0008] The assembled skiving cutter of the present invention is provided with a first cutting edge (holder cutting edge) on the main body component that cuts the small diameter portion of the workpiece, and further with a second cutting edge on the machining tooth component that cuts the large diameter portion of the workpiece, allowing the first cutting edge to function as a small diameter cutting edge while at the same time enabling the second cutting edge to be offset at a position different from the first cutting edge, thereby enabling the chips generated by the cutting process to be broken up.

[0009] In addition, by providing oil passages in the main body part that are formed radially from the through hole toward the outer periphery, the cutting edge can be cooled by ejecting coolant supplied from the machine tool from the main body part toward the machining tooth part, thereby eliminating the need to provide coolant holes or passages in the tooling, and achieving the effect of allowing a single tooling to be used even if the shape of the cutting edge is changed. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic cross-sectional view of an assembly-type skiving cutter 1 according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An assembly-type skiving cutter according to one embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a schematic cross-sectional view (along a rotation axis O) of an assembly-type skiving cutter 1 according to one embodiment of the present invention.

[0012] An assembled skiving cutter 1, which is one embodiment of the present invention, is formed from a circular main body part 10 having a through hole 11 in the center, as shown in Figure 1, a cutting tooth part 20 having cutting edges (second cutting edges) 25 arranged around the main body part 10, a cutting tooth fixing part 30 that fixes the cutting tooth part 20 to the main body part 10, and a tooling 40 having a through hole 41 formed along the rotation axis O and a protrusion 42 that fits into the through hole 11 of the main body part 10.

[0013] 1, the outermost periphery of this main body part 10 is provided with a cutting edge (holder cutting edge: first cutting edge) 15 that is not gear-shaped on the circumference, and is fixed in a state where it is inserted into a through hole 41 of a tooling 40 using a fixing bolt 50 that is inserted in a state where it penetrates the through hole 11. Also, the main body part 10 is provided with a plurality of oil passages 12, 13 that are formed radially from the through hole 11 toward the outer periphery of the assembled skiving cutter 1.

[0014] Next, a description will be given of the multiple oil passages 12, 13. As shown in Fig. 1, the oil passages 12, 13 include a first oil passage 12 that leads from the through hole 11 of the main body part 10 to the machining tooth fixing part 30 side in a cross section parallel to the rotation axis O of the assembled skiving cutter 1, and a third oil passage 13 that is formed radially from the through hole 11 of the main body part 10 toward the outer periphery and is longer than the first oil passage 12.

[0015] In addition, the machining tooth fixing part 30 has a second oil passage 31 that penetrates from the rotation axis O of the assembled skiving cutter 1 toward the outer periphery (of the assembled skiving cutter 1) as shown in Figure 1, and the opening of the first oil passage 12 formed in the main body part 10 and the opening of the second oil passage 31 are in close contact with each other.

[0016] As a result, the cooling liquid supplied from the machine tool body flows from the through hole 41 in the tooling 40 to a blind hole 51 provided longitudinally on the shaft of the fixing bolt 50, and communicates with the blind hole 51, and then flows radially (of the fixing bolt 50) through a through hole 52, through the through hole 11 in the main body part 10 and the first oil passage 12 in the main body part 10, and then through the second oil passage 31 in the machining tooth fixing part 30, and is then sprayed directly onto the cutting edge of the machining tooth part 20.

[0017] Furthermore, the cooling liquid supplied from the through hole 11 of the main body part 10 also flows into the third oil passage 13 of the main body part 10 as shown in FIG. 1, and is then sprayed directly toward the workpiece from the discharge hole provided in the main body part 10.

[0018] As described above, the assembled skiving cutter of the present invention has a first cutting edge (holder cutting edge) in the main body component that cuts the small diameter portion of the workpiece, and a second cutting edge in the machining tooth component that cuts the large diameter portion of the workpiece, allowing the first cutting edge to function as a small diameter cutting edge and enabling the second cutting edge to be offset at a position different from the first cutting edge, thereby enabling the chips generated by the cutting process to be broken up.

[0019] At the same time, by providing oil passages in a radial pattern extending from the through hole toward the outer periphery in the main body part, the coolant supplied from the machine tool can be discharged from the main body part toward the machining tooth part, directly cooling the cutting edge (rake face). This means that there is no need to provide coolant holes or passages in the tooling, and the same tooling can be used even if the shape of the cutting edge is changed. [Explanation of symbols]

[0020] 1 Assembled skiving cutter 10 Main body parts 11 Through holes in body parts 12 1st oilway 13 3rd oilway 15 First cutting edge 20 Machined tooth parts 25 Second cutting edge 30 Machining tooth fixing parts 31 2nd oilway 40 Touring 41 Tooling Through Hole 42 Touring protrusions 50 Fixing bolt 51 Blind hole 52 Through hole O Rotation axis

Claims

1. 1. An assembled skiving cutter comprising: an annular main body part having a through hole in the center; a cutting tooth part having cutting edges arranged around the main body part; a cutting tooth fixing part for fixing the cutting tooth part to the main body part; and a tooling having a through hole formed along a rotation axis and a protrusion to be fitted into the through hole of the main body part, wherein the outermost periphery of the main body part has a first cutting edge for cutting a small diameter portion of a workpiece, and the cutting tooth part has a second cutting edge for cutting a large diameter portion of the workpiece, the main body part is fixed to the tooling by a fixing bolt passing through the through hole of the main body part, and the main body part is provided with a plurality of oil passages formed radially from the through hole of the main body part toward the outer periphery.

2. The assembled skiving cutter according to claim 1, characterized in that the oil passage has a first oil passage that leads from a through hole of the main body part to the machining tooth fixing part side in a cross-sectional view parallel to the rotation axis of the assembled skiving cutter.

3. The assembled skiving cutter as described in claim 2, characterized in that the machining tooth fixing part has a second oil passage that penetrates from the rotation axis toward the outer periphery of the assembled skiving cutter in a cross-sectional view parallel to the rotation axis of the assembled skiving cutter, and an opening of the first oil passage and an opening of the second oil passage are in close contact with each other.

4. The assembled skiving cutter according to claim 2 or 3, characterized in that the main body part further has a third oil passage formed radially from the through hole of the main body part toward the outer periphery and longer than the first oil passage.

5. The assembled skiving cutter according to claim 4, characterized in that a blind hole is formed in the shaft of the fixing bolt along the longitudinal direction, and a through hole is formed in the shaft of the fixing bolt along the radial direction of the fixing bolt, communicating with the blind hole.

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