Process for machining cross pins on lathes

Abstract

Instead of receiving, as hitherto, cross pins (1) in a special chuck of a lathe and machining in each case one pin (2) and subsequently advancing the workpiece cyclically through 90°, according to the invention a supporting surface (18) having a clamping device (19) is provided in the working area, it being possible to place the unmachined part on said supporting surface (18) and to clamp said unmachined part such that, in this first setup, two mutually opposite end faces can already be machined, including centring holes, clamping between locating centres (22) subsequently taking place at said end faces for the machining of the adjoining lateral surfaces. After only one cyclic advance through 90° on this supporting surface (18), the same operation takes place for the second pair of pins, wherein it is even possible for the mutually aligned pins (2) to be machined simultaneously, given appropriate machinery.

Description

technical field [0001] The invention relates to a manufacturing method and a machine suitable for the method of manufacturing cross shafts and similar workpieces, said workpieces having rotationally symmetrical areas, the axes of rotation of which are at an angle to each other, in particular at right angles to each other . Background technique [0002] The concept of "cross axis" in the present invention is only for this type of workpiece. [0003] On such cross shafts, the end regions with respect to the sides and end faces have to be machined, while the central region generally retains the roughness resulting from the original forming process (casting or forging). [0004] In the past, such crosses were machined on a lathe by clamping the cross in a special chuck in such a way that only one journal of the cross protruded from the chuck and, in This journal can be machined while the workpiece is driven in rotation about an axis of rotation. [0005] The cross axis in the...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this method is the longer machining duration, since the four journals have to be machined one after the other

[0007] Another disadvantage is that the required complex special chuck is not only expensive, but also relatively large and space-consuming, and that the weight and size of this special chuck increase disproportionately with the increase of the cross axis, which make the mass driven in rotation very large and, depending on the size of the machine used, may only be able to process relatively small cross axes

[0008] Another disadvantage is that the manipulation of further clocked movements of 90° for each individual journal can lead to clocked movement errors

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