DE102014009526B4 - Tool spindle for fine machining - Google Patents

Abstract

Tool spindle for machining outer and / or inner contours with polar and / or axially arbitrary extending generatrices, with a solid state joint (13) with two legs (15, 16) having tool holder (1), said one leg (15) fixed with the tool holder (1) is connected and the other resiliently movable leg (16) receives a tool (3), wherein the tool cutting edge (14) of the tool (3) engages tangentially to the rotational movement of the workpiece and is deliverable radially to the workpiece, wherein for performing the delivery movement is provided with a translatory drive unit (10), wherein the tool spindle is arranged in a spindle housing (5) and wherein the drive unit (10) is torsionally rigidly connected to the spindle housing (5), characterized in that the drive unit (10) designed as piezotranslator ) allows several feed movements of the tool cutting edge (3) within a 360 ° rotation.

Description

The invention relates to a tool spindle for machining outer and / or inner contours with polar and / or axially arbitrary extending generatrices according to the preamble of claim 1. Aus DE 44 01 496 C2 is a Werkzeugschneidenverstelleinrichtung for processing round, non-circular or non-cylindrical inner or outer contours known. This has a tool holder with a solid-state joint. On the elastic leg of the solid-state joint, a tool is arranged, which is deliverable via a linear drive radially to the workpiece. The drive for the feed movement via a piezo actuator, which is arranged in the center of the tool spindle and is rotated together with this. The movements of the spring-elastic leg are detected by a displacement transducer, which also rotates with the tool spindle. A measuring signal and a control signal transformer pick up the signals from the rotating tool spindle, so that they can be forwarded to the machine control. Within the tool spindle, only a limited space is available. As a result, the maximum power of the piezo actuator is limited, which has a negative effect on the maximum possible adjustment and / or adjustment. The DE 38 28 854 A1 relates to a lathe tool for a precision boring machine. The tool cutting edge is also arranged on a resilient leg of a solid-state joint. As drive a piezoelectric actuator motor is arranged in the interior of the work spindle. To compensate for confounding factors, the infeed motion is controlled by a position control. About the supply of energy, or measuring and control signals to the rotating work spindle nothing is said. The DE 1 920 939 A discloses a drilling apparatus with automatic compensation of tool wear. The bore diameter is measured and compared with a setpoint. In case of deviations, a tool adjustment device is activated in order to compensate for the occurred wear. The tool cutting edge can be adjusted by means of a wedge bar in the radial direction. The wedge bar cooperates with a threaded spindle, which is arranged stationary on the machine frame. The adjustment movements are limited by limit switches.

task

It is the object of the present invention to expand the field of application of a tool spindle for machining outer and / or inner contours with polar and / or axial arbitrarily extending generatrix lines.

solution

This object is achieved with a tool spindle according to claim 1. Advantageous developments are the subject of the dependent claims.

According to an advantageous aspect of the invention, the drive for the feed movement and the associated displacement transducer are taken out of the rotating tool spindle and arranged relative to the spindle housing stationary or rotationally fixed. The linear motion generated by the drive is transmitted via a thrust bearing on a rotating pressure rod, which is passed through a hollow spindle in the spindle motor and is directly connected to a resilient leg of a solid-state hinge in operative connection. Outside the tool spindle is sufficient space available, so that the existing limitations in the prior art omitted. In addition, the transmission of the measurement and control signals is simplified because they no longer have to be tapped off by the rotating spindle shaft. The invention will be described in more detail below with reference to an exemplary embodiment.

1 shows a tool spindle according to the invention partially in section, partly in view

In 1 is a tool spindle with a spindle motor 6 in a spindle housing 5 shown. For attachment to a transport carriage or similar is a flange 12 intended. The spindle motor 6 drives a tool holder via a hollow spindle, not shown 1 so that this around the axis of rotation 2 rotates. Front side is on the tool holder 1 a solid-state joint 13 provided, which is based on a zone of targeted elastic deformation, the pivotal movement of a leg 16 allowed. On the thigh 16 is a tool 3 with a tool cutting edge 14 arranged. This can with a small but precisely adjustable pivoting movement of the elastic leg 16 be delivered radially to a workpiece, not shown. The other thigh 15 of the solid-state joint 13 is fixed to the tool holder 1 connected. The feed motion is from a drive unit 10 causes. This is designed as a piezotranslator and on the tool holder 1 opposite side of the spindle motor 6 arranged. The drive unit 10 is fixed to the housing cover 9 connected, in turn rotatably with the spindle housing 5 is screwed. Via a thrust bearing 7 and the pressure plate 8th can the associated push rod 4 be moved linearly. With this arrangement, the linear movement of the stationary drive unit 10 on the with the tool holder 1 rotating tool 3 transfer. It is advantageous on the drive unit 10 a transducer 11 provided that detects the movements and converts into electrical signals for the machine control. Since the piezotranslator can operate at high clock frequency, even at high speeds of the tool 3 several infeed movements of the tool cutting edge 14 possible within a 360 ° turn. In this way, highly oval, one-sided highly oval or even freely shaped outer and / or inner contours can be processed.

LIST OF REFERENCE NUMBERS

1

toolholder

2

axis of rotation

3

Tool

4

pushrod

5

spindle housing

6

spindle motor

7

thrust

8th

printing plate

9

housing cover

10

drive unit

11

transducer

12

flange

13

Solid joint

14

cutting edge

15

leg

16

leg

Claims (5)

Tool spindle for machining outer and / or inner contours with polar and / or axial arbitrarily extending generatrices, with a solid-state joint ( 13 ) with two legs ( 15 . 16 ) having tool holder ( 1 ), whereby the one leg ( 15 ) firmly with the tool holder ( 1 ) and the other elastically movable leg ( 16 ) a tool ( 3 ), wherein the tool cutting edge ( 14 ) of the tool ( 3 ) acts tangentially to the rotational movement on the workpiece and is deliverable radially to the workpiece, wherein for performing the feed movement, a translatory drive unit ( 10 ) is provided, wherein the tool spindle in a spindle housing ( 5 ) and wherein the drive unit ( 10 ) torsionally rigid with the spindle housing ( 5 ), characterized in that the drive unit designed as a piezo-translator ( 10 ) several feed movements of the tool cutting edge ( 3 ) within a 360 ° turn. Tool spindle according to claim 1, wherein the tool holder ( 1 ) from a spindle motor ( 6 ) around the axis of rotation ( 2 ) is rotated, characterized in that the drive unit ( 10 ) and the tool holder ( 1 ) on opposite sides of the spindle motor ( 6 ) are arranged. Tool spindle according to claim 1 or 2, wherein the drive unit ( 10 ) via a push rod ( 4 ) with the thigh ( 16 ) is in operative connection, characterized in that the spindle motor ( 6 ) is designed as a hollow spindle motor and that the push rod ( 4 ) through the hollow spindle of the spindle motor ( 6 ) is passed. Tool spindle according to one of the claims 1 to 3, characterized in that the drive unit ( 10 ) with a transducer ( 11 ) is in operative connection. Tool spindle according to claim 4, characterized in that the displacement sensor ( 11 ) torsionally stiff within the spindle housing ( 5 ) is arranged.

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