METHOD AND DEVICE FOR DEBURRING A WORKPIECE WITH AN INNER TOOTHING

Abstract

A method for deburring an internally toothed workpiece includes providing a workpiece and a deburring tool. The workpiece has an inner toothing produced by hob peeling, with first and second tooth flanks. The deburring tool has a first cutting plate and a second cutting plate, diametrically opposed to the first cutting plate. The method includes rotating the workpiece in a first rotating direction and deburring the first tooth flanks with the first cutting plate while the deburring tool is not rotating. The method also includes shifting the deburring tool relative to the workpiece such that the first cutting plate and the second cutting plate do not contact the workpiece, rotating the workpiece in a second rotating direction, opposite the first rotating direction, further shifting the deburring tool relative to the workpiece, and deburring the second tooth flanks with the second cutting plate while the deburring tool is not rotating.

Claims

1.-7. (canceled)

8. A method for deburring an internally toothed workpiece, comprising: providing a workpiece having: an axis of symmetry; and an inner toothing produced by hob peeling, the inner toothing comprising first tooth flanks and second tooth flanks; providing a deburring tool having: a center axis; a first cutting plate; and a second cutting plate, diametrically opposed to the first cutting plate with respect to the center axis; aligning the center axis to be parallel to the axis of symmetry; rotating the workpiece in a first rotating direction; deburring the first tooth flanks with the first cutting plate while the deburring tool is not rotating; keeping the center axis parallel to the axis of symmetry and shifting the deburring tool relative to the workpiece such that the first cutting plate and the second cutting plate do not contact the workpiece; rotating the workpiece in a second rotating direction, opposite the first rotating direction; keeping the center axis parallel to the axis of symmetry and further shifting the deburring tool relative to the workpiece; and deburring the second tooth flanks with the second cutting plate while the deburring tool is not rotating.

9. The method of claim 8, wherein: the workpiece comprises an end face; and the end face is deburred by the first cutting plate and the second cutting plate.

10. The method of claim 9, wherein: the workpiece comprises a cavity enclosed by the inner toothing; the deburring tool comprises a shaft; and the shaft remains arranged in the cavity during the entire deburring process.

11. The method of claim 8, further comprising performing an idle stroke of the hob peeling between the deburring the first tooth flanks with the first cutting plate and the deburring the second tooth flanks with the second cutting plate.

12. A tool for deburring an internally toothed workpiece, comprising: a T-shaped base form comprising: a shaft defining a center axis; and a cutting plate holding section aligned transversely to the shaft; and two cutting plates fastened to the cutting plate holding section, the two cutting plates arranged diametrically opposite with respect to the center axis with each cutting plate having a respective cutting edge facing the shaft.

13. The tool of claim 12 wherein an angle formed between the respective cutting edges is at least 165° and at most 178°.

14. The tool of claim 12 wherein the two cutting plates are indexable inserts.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the following, an exemplary embodiment is explained in more detail by means of a drawing. In the figures:

[0024] FIG. 1 shows a sectional view of an internally toothed workpiece,

[0025] FIG. 2 shows the workpiece during a first deburring process performed with a deburring tool,

[0026] FIG. 3 shows the workpiece during a second deburring process performed with the deburring tool,

[0027] FIG. 4 shows a perspective view of the internally toothed workpiece,

[0028] FIG. 5 shows a tooth of the inner toothing of the workpiece.

DETAILED DESCRIPTION

[0029] A workpiece 2, shown in isolation in FIGS. 1 and 4, is machined with a deburring tool 1, also referred to as a tool for short, in a method illustrated in FIGS. 2 and 3.

[0030] The starting point of the machining process is the provisioning of the workpiece 2 in the state shown in FIG. 1, in which an inner toothing of the workpiece 2, i.e., gear, designated 3, is already present. The inner toothing 3 was previously produced by hob peeling in a manner known per se. In addition, the workpiece 2 has an outer toothing 4, which is not machined in the method explained with reference to the figures.

[0031] In the present case, the inner toothing 3 is designed as a helical toothing, the individual teeth of which are designated 5. Each tooth 5 has two flanks 6, 7, i.e., tooth flanks, which adjoin the end faces of the gear 2 designated S1, S2. During hob peeling, the workpiece 2 was machined in the direction from the first end face S1 to the second end face S2. Hob peeling involves roughing in multiple passes followed by finishing in one to two passes. The machining direction BR is marked with an arrow in FIG. 1. At the tool exit WA, i.e., on the second end face S2, hob peeling results in burrs on the edges 8 of the tooth flanks 6, 7 and the tooth bases designated 17.

[0032] The tool 1 used to deburr the teeth 5 describes a T-shape shown in FIGS. 2, 3 and 5, with a shaft 9 and a T-crosspiece 10 adjoining it, which acts as a cutting plate holding section. A constriction 11 can be seen between the shaft 9 and the cutting plate holding section 10. The shaft 9 has a center axis M which, in the arrangements shown in FIGS. 2 and 3, is aligned in parallel to the axis of symmetry of the workpiece 2, designated S. In these arrangements, the shaft 9 is located within the cavity enclosed by the inner toothing 3. Viewed from a holder of the shaft 9, which is not shown, the end face S2 of the workpiece 2 to be machined with the tool 1 thus represents its rear side.

[0033] Two cutting plates 12, 13, namely indexable inserts, are attached to the T-crosspiece 10 of the tool 1 with screws 14. With respect to a plane passing through the center axis M, the cutting plates 12, 13 are designed to be mirror symmetrical to one another. The symmetry also applies to any clamping pieces. Each cutting plate 12, 13 has a cutting edge 15, 16 to be used in the present method. An angle α is formed between each cutting edge 15, 16 and a straight line parallel to the center axis M, as shown in FIG. 5. In the exemplary embodiment, the angle α corresponds to 87.2°. Thus, in the present case, an angle (2×α) of 174.4° is formed between the two cutting edges 15, 16, which are provided for machining the end face of the workpiece 2.

[0034] When deburring the workpiece 2, the cutting edge 15 of the cutting plate 12 is used first, as illustrated in FIG. 2. The workpiece 2 rotates counterclockwise. The tool 1 does not rotate. This process mainly removes the burrs located on tooth flanks 7.

[0035] After completion of this step, an idle stroke of the hob peeling is performed, which is not shown in the figures. The tool 1 is then moved to the position shown in FIG. 3, wherein the angular orientation of the tool 1, relative to the orientation of the T-crosspiece 9, does not change. In the exemplary embodiment shown, this means that the cutting plate 12 is located unchanged above the center axis M and the cutting plate 13 is located unchanged below the center axis M. Of course, the orientation of the axes M, S in space is arbitrary, wherein the axes M, S are always aligned to be parallel to one another during deburring. As an alternative to the arrangement of workpiece 2 and tool 1 shown, a vertical alignment of the axes M, S is possible, for example.

[0036] In the state shown in FIG. 3, the workpiece 2 rotates clockwise, wherein mainly the butts on the tooth flanks 6 are removed. Further machining steps for deburring the workpiece 2, such as brushing, are usually not required. Compared with conventional deburring processes, this ensures particularly rational and at the same time efficient machining.

REFERENCE NUMERALS

[0037] 1 Debarring tool [0038] 2 Workpiece, with an inner toothing [0039] 3 Inner toothing [0040] 4 Outer toothing [0041] 5 Tooth [0042] 6 Tooth flank [0043] 7 Tooth flank [0044] 8 Edge [0045] 9 Shaft [0046] 10 T-crosspiece, cutting plate holding section [0047] 11 Constriction [0048] 12 Cutting plate [0049] 13 Cutting plate [0050] 14 Screw [0051] 15 Cutting edge [0052] 16 Cutting edge [0053] 17 Tooth base [0054] a Angle [0055] BR Machining direction [0056] M Center axis [0057] S Axis of symmetry [0058] S1 End face [0059] S2 End face [0060] WA Tool exit