SU1013147A1 - Method of machining toothed wheels - Google Patents

Abstract

A METHOD FOR TURNING WHEELS TREATMENT, performed in several passes in conditions of continuous rolling and reciprocating movement of the tool, the number of teeth of which is repeatedly the number of teeth of the gear to be machined, while processing quality, before the last but one pass, the tool is brought into engagement with the gear to be machined after it completes n turns, determined from the ratio n -5 & Li g, - / and / yr gd Zu, - the number of teeth of the tool; Zj - the largest of the number of teeth of the pair and the tool-machined gear; Zy is the smallest number of teeth of a pair of tool-machined gear; The / and / is the integral part of the ratio value.

Description

The invention relates to mechanical engineering and can be used in the manufacture of gear wheels.

A known method of finishing machining of gear wheels is carried out over several passes under conditions of continuous rolling and reciprocating movement of the tool, the number of teeth of which is often the number of teeth of the gear to be machined, with the last pass carried out in the nursing mode 1.

However, this method has an insufficient machining accuracy, since the errors of the tool and its base are transferred to the gear to be machined.

The purpose of the invention is to improve the accuracy of the process of processing.

The goal is achieved by the fact that when machining gears for several passes in conditions of continuous rolling and reciprocating movement of the tool, the number of teeth of which is repeatedly the number of teeth of the wheel being processed, when making the last pass in the nursing mode, before the last but one pass the tool is engaged with the wheel being processed after it has completed n turns, determined from the ratio

0.5

-one,

n ZJ-XM / - 22

where7 is the number of tool teeth;

Z - the largest of the number of teeth of a pair of tools - machined gear;

Zj is the lesser of the number of teeth of a pair of tool-machined gear;

/ and / - target part of the ratio value.

FIG. 1 shows a processing circuit; in fig. 2 is a graph of errors occurring during the zuboobrabotka.

The method is carried out as follows.

The tool 1 (Fig. 1) processes the gear 2, then before the last but one pass, when the tool is taken out of the cutting zone, the gear to be machined performs a certain

the rotational speed calculated from the above relationship, while the kinematic chain of the machine does not open. The tool is then reintroduced into the cutting zone and the final finishing pass is made in the nursing mode.

Example. A gear with a number of teeth z 25 is machined with a tool with a number of teeth Zj, 20.

During processing (section I in Fig. 2), the errors of the instrument and its base are transferred to the product.

In the section TI of FIG. 2, when the tool is removed from the cutting zone, the errors transferred to the product are repeated without change.

During the last finishing pass, carried out after the gear to be machined has completed a certain number of revolutions, the tool is introduced into the cutting zone and its errors are in this case (section III of Fig. 2) out of phase with the previously obtained errors.

As a result of this, the greatest metal removal occurs where the errors resulting from the first passes are maximum 0 and there is practically no removal where these errors are minimal. Thus, an increase in processing accuracy is achieved.

The technical effect of the application of the method arises as a result of an increase in the accuracy of the products without the use of precision equipment, and the productivity is increased due to accelerated movements during idling.

The economic effect resulting from the proposed method of treatment can be evaluated by comparing with gear grinding, which usually achieves similar processing accuracy.

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Claims (1)

METHOD OF PROCESSING OF GEAR WHEELS, performed in several passes under conditions of continuous rolling and reciprocating movement of the tool, the number of teeth of which is not a multiple of the number of teeth of the gear being machined, while the last pass is carried out in the nursing mode, distinguishing On the site And on the site! 1 and C Figure 1 The position of the tool is that, in order to improve the quality of processing, before the penultimate pass, the tool is engaged with the gear being machined after it has made n rotations, determined from the ratio. 0¾. -1 weZ _{M is the} number of teeth of the tool; Zj is the largest of the number of teeth of a pair of tool-machined gear; 7 ₂ - the smaller of the number of teeth of a pair of tool-machined gear; / and / is the integer part of the gear ratio —B * ----.