Fineboring machine and process for producing bores with any pola

Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially

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Details

82 13, 82 15, 408714, B23B 4104

Patent

active

051746956

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a fineboring machine and process for producing bores with any polar and/or axial generating line.
Such a boring machine is known from DE 32 45 053 A1. It is possible, using that machine, to produce bores with any polar and/or axial generating line. There, this is achieved by a boring bar divided longitudinally, with different materials bonded with one another, which can be deflected radially relative to the axis of rotation, within a magnetic field applied externally, by the magnetostrictive length change caused by the magnetic field.
For lathes, it is furthermore known from DE 34 46 306 A1, to provide the holder of the tool with an elastically bendable area and to deflect it using a piezoelectric servomotor to produce micromovements for tool operation.
Proceeding from DE 32 45 053 A1, the invention is based on the task of achieving excursion of the tool using a piezoelectric servomotor, without the use of magnetic drives, in safe and structurally simple manner.
Due to the transfer of the driving force proceeding from the servomotor to the deflectable tool holder with a connecting rod, as proposed according to the invention, it is possible to use actuators which cannot be housed within the tool holder holding the boring bar, due to their size.
For exact finishing of the bores according to a precisely defined shape, it is proposed to detect the actual position of the tool during finishing via a measurement device directly or indirectly connected to the tool, and to compare it with the desired reference value pre-set for the servomotor. In case of a deviation between the two values, the control values to be input into the servomotor must be corrected in the direction of a reduction in the deviation found. This correction is achieved by the use of a known position control circuit in the control of the servomotor.
An embodiment is shown in the drawing. The drawing shows
FIG. 1 a longitudinal cross-section through a boring bar connected with the work spindle of a fineboring machine, together with a wiring diagram for the control of the servomotor drive
FIG. 2 a cross-section through the boring bar according to Line II--II in FIG. 1
At the work spindle 1 of a fineboring machine, not shown in greater detail, a boring bar 2 is attached in interchangeable manner. A turning tool 3 is rigidly connected with a tool holder 4. The tool holder 4 can be deflected by spring action, relative to the axis of rotation of the boring rod 2. The tool holder 4 is directly connected with the boring bar 2 only via the stay 5. The tool holder 4 is made of the material of the boring bar 2 and is separated from the latter by electroerosion.
Radial deflection of the tool holder 4 is caused by a piezoelectric servomotor 6 arranged in the work spindle 1. The servomotor 6 transfers its setting movements to a connecting rod 8 arranged in the axis of rotation of the boring bar, to the free end of the tool holder 4, via an intermediate piece 7. The connecting rod 8 attaches to the tool holder 4, or is connected with it, in such a way that during excursion of the tool holder 4, no radial relative movements occur between the latter and the connecting rod 8.
At its end facing the servomotor 6, the connecting rod 8 is mounted in a membrane 9 which runs perpendicular to the drive direction. The membrane 9 can be rigidly connected with the removable boring bar or with the work spindle.
The intermediate piece 7 serves as a measuring device for the value of the operating movements proceeding from the servomotor 6 in each case. For this purpose, the intermediate piece 7 is structured as a path sensor. The function as a path sensor is brought about by the use of an induction coil 10, in that a metal piece 11 which is rigidly connected with the work spindle 1 and can be magnetized engages with the induction coil.
The reference shape of the bore to be produced can be pre-set as an electronic image. From this electronic image, the pulses required for excursion can be applied to the servomotor 6.
Since interference factors proceed

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