Pressure shoe with expansion chamber

Abstract

A pressure shoe (1) includes a press surface (2) for directly pressing finishing tape onto a radial circumferential surface (3) of a rotating workpiece section (4) during a finishing process. A plurality of expansion elements (5) is formed in the pressure shoe (1). Each of expansion elements (5) are expandable individually and independently of one another radially while deforming the press surface (2) in a direction of the circumferential surface (3) of the workpiece section (4), so that during the finishing process, the shape of the circumferential surface (3) of the workpiece section can be influenced in a targeted manner via different expansion of the expansion elements (5) distributed over the press surface (2).

Claims

1. A pressure shoe (1), comprising: a press surface (2) for directly pressing finishing tape onto a radial circumferential surface (3) of a rotating workpiece section (4) during a finishing process; a plurality of expansion elements (5) being formed in the pressure shoe (1), wherein each of the plurality of expansion elements (5) are expandable individually and independently of one another radially while deforming the press surface (2) in a direction of the circumferential surface (3) of the workpiece section (4), so that during the finishing process, the shape of the circumferential surface (3) of the workpiece section can be influenced in a targeted manner by different expansion of the expansion elements (5) distributed over the press surface (2), wherein each expansion element is formed by a respective expansion chamber (5), wherein each expansion chamber (5) is connected individually to a line (6) leading out of the pressure shoe (1) and is expandable radially under pressurization of the fluid while deforming the press surface (2) in a direction of the circumferential surface (3) of the workpiece section (4).

2. The pressure shoe (1) according to claim 1, wherein the plurality of expansion elements (5) run parallel to one another in a circumferential direction (7) along the press surface (2) of the pressure shoe (1).

3. The pressure shoe (1) according to claim 1, wherein the plurality of expansion elements (5) run parallel to one another in an axial direction (8) along the press surface (2) of the pressure shoe (1).

4. The pressure shoe (1) according to claim 1, wherein the expansion of the expansion elements (5) in a radial direction (9) is at most 50 m.

5. A method for operating a finishing device with a pressure shoe (1), comprising at least the following steps: providing a pressure shoe (1), comprising: a press surface (2) for directly pressing finishing tape onto a radial circumferential surface (3) of a rotating workpiece section (4) during a finishing process; a plurality of expansion elements (5) being formed in the pressure shoe (1), wherein each of the plurality of expansion elements (5) are expandable individually and independently of one another radially while deforming the press surface (2) in a direction of the circumferential surface (3) of the workpiece section (4), so that during the finishing process, the shape of the circumferential surface (3) of the workpiece section can be influenced in a targeted manner by different expansion of the expansion elements (5) distributed over the press surface (2), wherein each expansion element is formed by a respective expansion chamber (5), wherein each expansion chamber (5) is connected individually to a line (6) leading out of the pressure shoe (1) and is expandable radially under pressurization of the fluid while deforming the press surface (2) in a direction of the circumferential surface (3) of the workpiece section (4); pressing a finishing tape onto the radial circumferential surface (3) of the workpiece section (4) to be processed, using the pressure shoe (1); and expanding at least one of the plurality of expansion elements (5), so that the expansion element (5) deforms the press surface (2) in a radial direction.

6. The method according to claim 5, wherein the expansion of the at least one expansion element (5) is kept constant during the finishing process.

7. The method according to claim 5, wherein the expansion of adjacent expansion elements (5) is different.

8. The method according to claim 5, wherein the expansion of each expansion element (5) is changed in each case during the finishing process.

9. The method according to claim 8, wherein the expansion of each expansion element (5) is changed as a function of the rotational position of the workpiece section (4).

10. The method according to claim 7, wherein the expansion of each expansion element (5) is changed as a function of the relative axial position between pressure shoe (1) and workpiece section (4).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention and the technical field are described in the following on the basis of the figures, wherein it should be pointed out that the figures show preferred embodiments of the invention. In the figures

(2) FIG. 1: schematically shows a pressure shoe and a workpiece section,

(3) FIG. 2: schematically shows the pressure shoe in longitudinal section,

(4) FIG. 3: schematically shows a cross section through expansion chambers of the pressure shoe,

(5) FIG. 4: schematically shows a cross section through a further embodiment of the expansion chambers, and

(6) FIGS. 5 to 8: schematically shows a workpiece section during the finishing process for targeted creation of non-roundness.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

(7) FIG. 1 shows a pressure shoe 1 with a radially inwardly directed press surface 2 with a partial-ring-shaped construction. In the pressure shoe 1, the expansion elements are formed as indicated expansion chambers 5. The expansion chambers 5 are arranged next to one another in the axial direction 8 and run parallel to one another in the circumferential direction 7.

(8) During the finishing process, a finishing tape, which is not shown, is arranged between the press surface 2 and a radial circumferential surface 3 of a workpiece section 4, which is only indicated. During the finishing process, the workpiece section 4 rotates about a rotational axis, whilst the workpiece section 4 and the pressure shoe 1 oscillate relatively to one another in the axial direction 8, wherein the finishing tape, which is not shown, is pressed by the press surface 2 of the pressure shoe 1 onto the radial circumferential surface 3 of the workpiece section 4 for cutting ablation.

(9) It becomes clear from the longitudinal section, illustrated in FIG. 2, through the pressure shoe 1 in the region of an expansion chamber 5, that each expansion chamber 5 is connected to a line 6 leading out of the pressure shoe 1 individually, so that the expansion chambers 5 can be loaded with a fluid independently of one another. If the expansion chamber 5 is loaded with a fluid, then the expansion chamber 5 expands in the radial direction 9 with the section of the press surface 2 assigned to the expansion chamber. As the expansion chambers 5 can expand independently of one another, the profile of the press surface 2 can be adjusted along the axial direction 8, so that the crowning of the workpiece section 4 can be influenced in a targeted manner.

(10) A cross section through two expansion chambers 5 is illustrated in FIG. 3, wherein only the left expansion chamber 5 is loaded with a fluid, so that the expansion chamber 5 is expanded in the radial direction 9.

(11) An alternative design of the expansion chambers 5 is illustrated in FIG. 4. The expansion chambers 5 are formed with a bellows-shaped cross section, so that a larger expansion can be achieved in the radial direction 9. In FIG. 4 also, only the left expansion chamber 5 is loaded with a fluid.

(12) Alternatively, it can also be provided that the expansion chambers 5 run parallel to one another in the axial direction 8 and are arranged next to one another in the circumferential direction 7. In an arrangement of the expansion chambers 5 of this type, the non-roundness of the circumferential surface 3 of the workpiece section 4 to be processed can be influenced in a targeted manner.

(13) The application of force to the circumferential surface 3 of the workpiece section 4 by the expansion chambers 5 of the pressure shoe 1 in such a targeted processing of the non-roundness is illustrated in FIGS. 5 to 8. Here, the workpiece section 4 is oval.

(14) Whilst, in the alignment illustrated in FIG. 5, all expansion chambers 5 are expanded to the maximum extent, the expansion of each individual expansion chamber 5 is adapted to the desired non-roundness during the rotation of the workpiece section 4, wherein F.sub.0 is larger than F.sub.1 and F.sub.1 is larger than F.sub.2. Thus, in FIG. 6, the expansion of the expansion chambers 5 is shown after a rotation through 45, in FIG. 7 after a rotation through 90 and in FIG. 8 after a rotation through 135.

(15) Thus, for example, the expansion of the upper expansion chamber 5 of the right pressure shoe 1 is lowest for a rotation through 45 (FIG. 6) and continues to increase until the rotation angle of 135 (FIG. 8) is reached.

(16) The expansion of the upper expansion chamber 5 of the left pressure shoe 1 is by contrast initially at the maximum for the rotation from 0 to 90 and is reduced slightly until the rotation angle of 135 is reached.

(17) The present invention is connected with the advantage that the shape of a circumferential surface 3 of a workpiece section 4 can be influenced in a targeted manner by a finishing process using the pressure shoe 1.

(18) The specification incorporates by reference the disclosure PCT/EP2016/066123, filed Jul. 7, 2016, and DE 10 2015 008 814.9, filed Jul. 10, 2015.

(19) The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawings, but also encompasses any modifications within the scope of the appended claims.

REFERENCE LIST

(20) 1 Pressure shoe 2 Press surface 3 Circumferential surface 4 Workpiece section 5 Expansion chamber 6 Line 7 Circumferential direction 8 Axial direction 9 Radial direction