DE102016001826B3 - Method and device for processing differential housings - Google Patents

Abstract

The invention relates to a method and a machine tool for internal machining of differential housings (1) with main and transverse bores (2, 3) in a machine tool with a about a rotation axis (9) driven workpiece spindle (4) and with a motor spindle (5) with a Take-up mandrel (6) with the following method steps: a) Automatic picking up of the differential housing (1) by the workpiece spindle (4) by means of a clamping device (7), wherein the axis intersection point (8) of the main and transverse bores (2, 3) is centered to the axis of rotation ( 9) of the workpiece spindle (4), b) positioning at least one tool (10) through a housing opening (16) in the interior of the differential housing (1), c) threading the at least one tool (10) onto the receiving mandrel (6), d) machining of the motor spindle axis (11) concentric counterbore (14) or ball depression (15), wherein the differential housing (1) in step a) in the clamping means (7) in a plane parallel z An axis of the main or transverse bore (2, 3) concentric with the axis of rotation (9) of the motor spindle (4) is arranged in step c) and wherein the differential housing (1 ) is locked in this position in the clamping means (7).

Description

The invention relates to a method and a machine tool for internal machining of differential housings, in particular the countersinking of the main and transverse bores according to the preamble of claim 1 and claim 4. From the DE 103 07 977 B4 a method is known, being positioned for processing the inner sides of the differential housing rotating tools through the side housing openings in the housing interior and threaded onto a cutter mandrel. This is connected at one end with a rotatably driven tool spindle is supported at the other end with a quill.

It is the object of the present invention to provide a simplified method for internal machining of differential housings. It is also an object to provide a device for carrying out the method. This object is achieved by a method according to claim 1 and a machine tool according to claim 4. Advantageous developments are the subject of the dependent claims.

According to an advantageous aspect of the invention, the mandrel for the tools is supported in the bearings of the main or transverse bores. This can be dispensed with a support at the free end of the mandrel. A support sleeve or a counter-pressure spindle can be omitted. To compensate for position inaccuracies Fügelemente are provided in the clamping device.

The invention will be described in more detail below with reference to an exemplary embodiment.

Show it:

1 : A clamping device with differential housing, motor spindle and countersinking tool

2 : the processing of the ball depressions

1 shows a detail of a workpiece spindle 4 with a clamping device 7 in which a differential housing 1 is included. This has a main bore 2 and a transverse bore 3 on. On the left inside of the differential housing is a tool 10 for processing the surface reductions 14 shown. According to the procedure, the tool 10 from a feed device, not shown, through a housing opening 16 inside the differential housing 1 positioned and then on a mandrel 6 threaded. This will be the differential housing 1 initially via joining modules 13 floating in the clamping device 7 recorded and locked after highly accurate positioning. Advantageous is the differential housing 1 with his camps 12 in the main hole 2 on appropriately adjusted centering surfaces on the mandrel 6 fixed. The mandrel 6 is from a motor spindle 5 held, which is fixedly arranged on a machine frame, not shown. To thread the workpiece spindle moves 4 with chip removal 7 , Differential housing 1 and tool 10 along a major axis of the machine coordinate system (X-axis). The joining modules used to compensate for position inaccuracies 13 are able to compensate angular errors or lateral errors to a certain extent and can be locked after the compensation has been completed. For example, you are in the DE 42 07 998 A1 described. After completing the first flattening 14 the workpiece spindle moves 4 to the left, so that also the second counterbore 14 can be processed on the opposite side of the housing. According to an advantageous embodiment of the invention, both the surface reductions 14 as well as the ball lowering 15 be processed in one clamping. Unlike in the presentation in 1 become the differential housings 1 Clamped around a horizontal axis rotated by 90 °, leaving the housing openings 16 to the clamping device 7 or are directed downward. The tools 10 are then placed from the bottom inside the case. After completion of the plan reductions 14 the workpiece spindle moves 4 to the right. She threads the tool 10 again off and the mandrel 6 is removed from the housing interior. Then, the machining direction is turned by rotating the workpiece spindle 4 around a rotation axis 9 changed by 90 ° and the tool 10 for processing the ball depressions 15 threaded. For main and transverse wells 2 . 3 with different diameters are in the motor spindle 5 arbors 6 used with appropriately adjusted centering surfaces.

2 shows the machining of the ball depressions 15 , The movement is analogous to the comments for 1 , By supporting the mandrel directly in the bearings 12 the main and transverse bore 2 . 3 is a high-precision machining of the plan and ball sinks 14 . 15 possible and common in the art counter-pressure spindles or Stützpinolen can be omitted.

LIST OF REFERENCE NUMBERS

1

differential case

2

main bore

3

cross hole

4

Workpiece spindle

5

motor spindle

6

arbor

7

clamping means

8th

Intercept

9

the rotation axis

10

Tool

11

Motor spindle axis

12

camp

13

joining module

14

spot facing

15

ball-cutting

16

housing opening

Claims (6)

Method for internal machining of differential housings ( 1 ) with main and transverse bores ( 2 . 3 ) in a machine tool with one about an axis of rotation ( 9 ) driven workpiece spindle ( 4 ) and with a motor spindle ( 5 ) with a mandrel ( 6 ) with the following process steps: a) automatic picking up of the differential housing ( 1 ) through the workpiece spindle ( 4 ) by means of a tensioning means ( 7 ), where the intercept point ( 8th ) of the main and transverse wells ( 2 . 3 ) centric to the axis of rotation ( 9 ) of the workpiece spindle ( 4 ), b) positioning at least one tool ( 10 ) through a housing opening ( 16 ) inside the differential housing ( 1 ), c) Threading the at least one tool ( 10 ) on the mandrel ( 6 ), d) machining to the motor spindle axis ( 11 ) concentric counterbore ( 14 ) or ball lowering ( 15 ), characterized in that the differential housing ( 1 ) in process step a) in the clamping device ( 7 ) in a plane parallel to the axis of rotation ( 9 ) of the motor spindle ( 4 ) is received in a floating manner, that in method step c) an axis of the main or transverse bore ( 2 . 3 ) concentric with the motor spindle axis ( 11 ) and that the differential housing ( 1 ) in this position in the clamping device ( 7 ) is locked. Method according to claim 1, characterized in that the main or transverse bores ( 2 . 3 ) each with their warehouses ( 12 ) on the mandrel ( 6 ) concentric with the motor spindle axis ( 11 ) to be ordered. Method according to claim 2, wherein both the counterbore ( 14 ) as well as the ball lowering ( 15 ) are processed in one clamping, characterized in that after method step d) the following method steps are carried out: e) removing the tool ( 10 ) and the mandrel ( 6 ) from the differential housing ( 1 ), f) changing the machining direction by turning the workpiece spindle ( 4 ) around the axis of rotation ( 9 g) threading a tool ( 10 ) on the mandrel ( 6 h) Repeat the process step d) Machine tool for internal machining of differential housings ( 1 ) with main and transverse bores ( 2 . 3 ) for carrying out the method according to one of the claims 1 to 3, with a workpiece spindle ( 4 ) for gripping, clamping, transporting, positioning and depositing differential housings ( 1 ), with a clamping device ( 7 ) and a motor spindle ( 5 ) with a mandrel ( 6 ) for threading tools ( 10 ), wherein the workpiece spindle ( 4 ) about a rotation axis ( 9 ) is rotationally driven, characterized in that the tensioning means ( 7 ) at least one joining module ( 13 ) and that the differential housing ( 1 ) in a plane parallel to the axis of rotation ( 9 ) is floating. Machine tool according to claim 4, characterized in that the floating accommodated differential housing ( 1 ) after the compensation of position inaccuracies in the clamping device ( 7 ) is lockable. Machine tool according to claim 5, characterized in that the receiving mandrel ( 6 ) to the diameter of the bearings ( 12 ) in the main or transverse wells ( 2 . 3 ) has adapted centering surfaces.

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