Gear cutting – milling – or planing – Gear cutting – Gear chamfering or deburring
Patent
1998-04-03
1999-05-04
Briggs, William
Gear cutting, milling, or planing
Gear cutting
Gear chamfering or deburring
451900, B23F 1910
Patent
active
058996451
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a machine tool for sloping the tooth flanks of a gear, with two flanks being milled simultaneously, with a rotationally driven workpiece holder and with two rotationally driven tool spindles adjustable relative to the workpiece along their axes, with the angular alignment relative to the workpiece axis being adjustable for each to receive a milling cutter, especially a face milling cutter or a one-tooth fly cutter, with the workpiece optionally being rotationally driven cyclically or continuously, the tool spindles being correspondingly displaceable forward and backward axially in synchronization with the workpiece cycle, or rotating, fixed axially, in synchronization with the continuous workpiece rotation, with the workpiece being advanced in the axial direction and with each tool spindle having a carriage associated therewith, said carriage being displaceable by an axial displacement drive.
A machine tool of the this type under discussion is known from DE 41 34 925 C1, with the tool spindles received by a carriage being moved back and forth by means of an oscillator at a very rapid sequence of 1200 or more strokes per minute, in synchronization with the rotation of the workpiece. Continuous adjustment of the tool spindles in the direction of the workpiece in order to produce the slopes is superimposed on this. Accordingly, two separate movements take place along the tool spindle axes, namely the oscillating movement and the actual advance displacement that makes the design of such a machine tool more expensive. This document shows that the workpiece can also be indexed one division at a time when impact milling operation is desired, which corresponds to cyclic operation. In this case also, the actual tool feed would be superimposed on the oscillating movement of the tool spindle.
SUMMARY OF THE INVENTION
It is an object of the invention to develop a machine tool according to the species with a simple construction such that short machining times can be achieved particularly when forming slopes on tooth flanks in a cyclic method and the machine tool can be converted rapidly and easily when changing the machining method.
According to the invention, tool feed during chip removal is determined by the shape of an axial radial cam that is replaceable and is rotationally driven by the axial displacement drive, with the stroke of this cam corresponding to at least the chip removal distance and, with the two flanks of the axial radial cam being located with zero play between sensing rollers of the carriage.
As a result of such a development of The Invention, a machine tool according to the introductory-mentioned type is created that has a simple design and which firstly permits the production of slopes on tooth flanks in known fashion by the rotary method. The axial displacement drive does not operate at this time, so that the tool spindle and workpiece turn in synchronization with the workpiece spindle as it advances. If it is desired to slope the tooth flanks of a gear using the cyclic method, during the chip removal process the tool or tool spindle performs the advance movement. This is accomplished by means of the axial displacement drive, with its rotationally driven axial radial cam, which is easily and rapidly replaceable, determining the amount of tool feed during the chip removal process. No additional feed movement is superimposed as in the prior art. For example, if the stroke produced by the axial radial cam is approximately 5 mm, approximately 240 strokes per minute can be used when producing slopes, in other words a value that cannot be achieved using tool spindle supports that are moved back and forth hydraulically. This high number of strokes therefore produces the shortest machining times in the cyclic process, together with precise machining results. The flanks of the axial radial cam that are located with zero play between the sensing rollers of the carriage produce optimum adjustment and movement of the tool carried by the tool
REFERENCES:
patent: 1960536 (1934-05-01), Haas
patent: 3728902 (1973-04-01), McCaughey
patent: 4726720 (1988-02-01), Lieser
Garschagen Friedrich Albert
Heym Hans-Udo
Briggs William
Farber Martin A.
Wera Werk Hermann Werner GmbH & Co.
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