SU106524A1 - Tool post for turning lathe for turning shaft of stepped and shaped profile - Google Patents

Description

The tool holders for the lathe for turning the shafts of the stepped and shaped profiles, which use a non-moving step gauge to control the cross feed of the tool when moving the longitudinal support of the machine, are known.

The peculiarity of the proposed tool holder is the use between the cutter and the stepped ruler of two interacting stepped spring-loaded cams, one of which is articulated with the plunger supporting the cutter and the other with the plunger that is subject to the action of the fixed step ruler when moving the longitudinal slide and serving to switch the first cam .

This embodiment of the tool holder provides the cutter with a rigid support at each machined step.

The described tool holder is shown in FIG. 1 above; in fig. 2 given the scheme of interaction between the links of the toolholder.

The body / is made with three intersecting IM11C slots: in the first one, the plunger 2 is mounted; in the second - the plunger 5 and c. the third - step line 4.

From the end, the plunger 2 has a groove in which the cutter is fastened with screws, and in its lower part an interchangeable cam 5 is fixed. On the working part of the cam, steps are made corresponding to the steps of the product, with which the plunger 2 pressed by the spring 6 rests on the stepped cam of the plunger 3; the plunger 3 in turn is pressed against the spring 7 by means of a roller to the ruler 4.

By turning on the mechanism for displacing the longitudinal caliper, the reztsederl tel is reported to have a longitudinal movement; Since the ruler 4 is fixed by means of a fork 8 of a bracket 9 on the fixed part of the machine, the plunger roller 3 rolls along the side of the ruler. At this time, the cutter grinds the first step of the part; at the moment when the rolls hit on the protrusion of the line 4, the plunger 3 moves

with respect to the plunger, njer 2 until the cam of the piston of the piston 3 proves to be opposite the cavity of the plunger of the cam 2.,

At the moment of depression of the valleys, the plunger 2 under the action of the spring and the cutting force will move to the next cam stage, and the tip of the tool will move to CvfI, the leading stage of the part, and the tool can be retracted or instantly, which is used for small values of half-difference diameters or slow for large steps details.

This cycle will be repeated until the parts are completely machined; The tool holder retraces until the roller of the plunger 2 hits the stop 10 of the ruler 4. At this moment, the plunger 3 under the action of the spring 7 moves to its original position, and the tool holder is ready for machining the new part.

To soften the impact of the plunger, when it returns to its original position (in the case of machining parts with large steps), the shock absorber is activated by pressing the spring //,

In order to eliminate the plunger cam cam Zdar, during the return stroke, a roller 12 is inserted on the working part of the hook 5, which by means of stops delays the return of the plunger a 3 until the cam 5 is completely withdrawn.

Line 4 is not a copy of the contour of the workpiece and serves only to switch the support part of the plunger 3. As a result, for almost the entire length of the machined step, the plunger 2’s support is kept very rigid, and the errors of the ruler and tool holder are not reflected on the tool, which guarantees high precision machined parts.

By changing the inclination of the cam steps 5 and installing additional stops on the ruler 4, it is possible to process the stepped cylinders with the transition to a taper and with the subsequent plunge, as well as other profiles. The steps of one of the cams are made according to the dimensions corresponding to the half-difference of the diameters of the steps of the product.

Subject invention

Claims (1)

1. A tool holder for a lathe for turning a shaft of a stepped and shaped profile using a fixed stepped ruler to control the cross feed of the cutter when moving the longitudinal support of the machine, characterized in that, in order to provide the cutter with a hard support at each machined step, between the cutter and the stepped ruler two interacting stepped spring-loaded cams are used, one of which is articulated with the plunger carrying the cutter and the other with the plunger that is affected by the fixed th line speed when moving machine longitudinal slide and for switching the position of the first cam, 2, the shape of the tool holder according to claim 1, characterized in that the steps of one of the cams are made according to the dimensions corresponding to the half-difference of the diameters of the steps of the product, 3, In the tool holder according to the PP, 1 and 2, use a stop on the stepped ruler to interact at the end of the return stroke of the slide with the plunger that carries the tool to return it to its original position.