GRINDING MACHINE FOR GRINDING OF A PROFILE

Abstract

A grinding machine for grinding of a profile, comprising a machine bed, wherein a machining device is arranged on the machine bed, wherein the machining device comprises a swivel head which carries a first grinding spindle with a first grinding tool, especially with a roughing grinding tool, and a second grinding spindle with a second grinding tool, especially with a finishing grinding tool, wherein a workpiece carrier being a rotary table is arranged on the machine bed. To allow the production of workpieces with a complex geometry in a high precision in an economical manner the invention proposes that the swivel head further carries at least one third grinding spindle with a third grinding tool, wherein the swivel axle of the swivel head is directed horizontally and the axis of rotation of the rotary table is directed vertically.

Claims

1. A grinding machine for grinding of a profile, comprising a machine bed, wherein a machining device is arranged on the machine bed, wherein the machining device comprises a swivel head which carries a first grinding spindle with a first grinding tool, especially with a roughing grinding tool, and a second grinding spindle with a second grinding tool, especially with a finishing grinding tool, wherein a workpiece carrier being a rotary table is arranged on the machine bed, wherein the swivel head further carries at least one third grinding spindle with a third grinding tool, wherein the swivel axle of the swivel head is directed horizontally and the axis of rotation of the rotary table is directed vertically.

2. The grinding machine according to claim 1, wherein the swivel axle of the swivel head and the axis of rotation of the rotary table are arranged in a common plane.

3. The grinding machine according to claim 1, wherein the first grinding tool and the second grinding tool are designed as profile tools for grinding of a non-planar contour and that the third grinding tool is designed as grinding tool for grinding of a cylindrical or planar surface of the workpiece which has to be ground.

4. The grinding machine according to claim 3, wherein the first grinding spindle and the second grinding spindle are designed as rod-shaped or tubular parts with a common longitudinal axis which extend to opposite sides from a centre region of the swivel head.

5. The grinding machine according to claim 4, wherein the axis of rotation of the first grinding tool and the axis of rotation of the second grinding tool are perpendicular to the longitudinal axis.

6. The grinding machine according to claim 4, wherein the third grinding spindle comprises a longitudinal axis which intersects perpendicular the longitudinal axis of the first and second grinding spindle.

7. The grinding machine according to claim 6, wherein the longitudinal axis of the third grinding spindle is the axis of rotation of the third grinding tool.

8. The grinding machine according to claim 7, wherein first grinding spindle, the second grinding spindle and the third grinding spindle form a T-shaped structure.

9. The grinding machine according to claim 5, wherein the swivel head carries furthermore a measuring element.

10. The grinding machine according to claim 9, wherein the first, the second and the third grinding spindle as well as the measuring element form a crosswise structure seen in the direction of the swivel axle of the swivel head.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0021] In the drawing:

[0022] FIG. 1 shows in perspective view a grinding machine and

[0023] FIG. 2 shows in perspective view an enlargement of the workspace of the grinding machine according FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0024] In the figures a grinding machine 1 is shown on which a so-called needle ring of a cycloidal gear (not depicted) is finished in the embodiment. The grinding machine 1 has a machine bed 2 which carries a machining device 3. Furthermore, the grinding machine 1 has a rotary table 9 for the reception of a (not depicted) workpiece. The axis of rotation of the rotary table 9 is arranged vertically.

[0025] The machining device 3 can be moved translational in the direction to or away from the rotary table 9 to bring grinding tools with the workpiece in engagement. The machining device 3 has as an essential part a swivel head 4 which can be pivoted around a swivel axle A; the swivel axle A is oriented horizontally.

[0026] The swivel head 4 comprises, which can be seen best from FIG. 2, three grinding spindles, namely a first grinding spindle 5, a second grinding spindle 7 and a third grinding spindle 10. Each grinding spindle 5, 7, 10 carries respectively a grinding tool 6, 8 and 11. The first grinding tool 6 is a profile grinding wheel for roughing of a profile of the workpiece, the second grinding tool 8 is a profile grinding wheel for finishing of the mentioned profile. The third grinding tool 11 is a grinding wheel by which a cylindrical outer circumference area of the workpiece can be ground.

[0027] As can be seen the axes of rotation C and D of the first and of the second grinding tool 6 and 8 are arranged parallel to another; the two grinding spindles 5 and 7 are designed as tubular grinding arms which carry in their axial end region the respective grinding tools 6, 8. The two grinding arms extend from a centre region M of the swivel head 4 to opposite directions; however they have the same longitudinal axis L.

[0028] The third grinding spindle 10 comprises a longitudinal axis K; at the end of the grinding spindle 10 the third grinding wheel 11 is arranged.

[0029] Furthermore, a measuring element 12 in the form of a measuring key button is arranged at the swivel head 4.

[0030] As results from the figures the three grinding spindle 5, 7 and 10 as well as the measuring element 12 form a crosswise structure, seen in horizontal direction and in the direction of the axis A respectively.

[0031] Thus, the following possibility of machining results:

[0032] At first, a workpiece which is clamped on the rotary table 9 can be cylindrical ground with the grinding wheel 11 at its outer circumference. Correspondingly, of course also a respective machining of an inner circumference area is possible.

[0033] At this machining the swivel head 4 is in the position as be shown in the figures.

[0034] By a subsequent pivoting of the swivel head 4 around 90 the first grinding wheel 6 can be prepared for roughing of the profile (in the single dividing process). Thereby, the profile can be rough machined. After roughing of the profile the swivel head 4 is pivoted by 180 so that the second grinding wheel 8 is brought in the machining position for finishing of the profile.

[0035] After the finishing a measurement by means of the measuring element 12 can occur wherefore the swivel head 4 is pivoted by 180 from the position which is shown in the figures.

[0036] Of course, the order of the machiningwith respect to the round grinding and the profile grindingcan also be done in a different manner.

[0037] The swivel head 4 is designed as precision rotary table which makes it possible that all relevant fine machining operations are carried out in one clamping of the workpiece. A change of the clamping of the workpiece is thus redundant and is the precondition for increasing the machining precision to a high level.

[0038] This is promoted also by the crosswise structure of the mentioned elements at the swivel head 4 which allows an effective and economical production.

[0039] If applicableand this is not specifically depicted in the figuresalso a surface grinding of the face of the workpiece can be carried out in the same clamping on the rotary table 9.

[0040] While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.