SU1491680A1 - Method of dimensional pulsed final setting - Google Patents

Abstract

This invention relates to methods for controlling the dimensional setting of a machine or a dimensional control device. The purpose of the invention is to increase the processing accuracy with significant fluctuations in the magnitude of the trend of the process by changing the magnitude of the subsetting pulses and eliminating the expansion of the size variation zone. For this, the sign of the impulse impulse is taken opposite to the sign of deviation from the critical boundary of the part, the last of the lot. The magnitude of the sub adjustment pulse is varied depending on the combination of the signs of the size deviation in the sliding sample. The current value of the pulse is reduced at the minimum number of identical signs and increased at the maximum. 1 hp ff.

Description

This invention relates to methods for controlling the dimensional setting of a machine or a dimensional control device.

The purpose of the invention is to increase the machining accuracy with significant fluctuations in the magnitude of the process trend by changing the magnitude of the impulse retracement and eliminating the expansion of the size spread zone.

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The method is illustrated by an example, where the first line contains the serial numbers of parts, the second is a sequence of digits of parts, in the third - the number of identical characters in the last four (in a sample) of parts, in the fourth - the value of r, -, in the fifth - current impulse a. Correction of the adjustment begins with the fifth part, after each of the first three cycles / A; | AO.

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The sample size (four details) is minimal to provide three possible solutions — reduction of the pulse, its preservation and increase. Increasing the current pulse value by a factor of two with the maximum number of identical characters in the sample equal to four, or reducing this value by a factor of two with the number of the same characters equaling two, effectively influences the changing sub-tuning process without swinging. him. Preserving the magnitude of the impulse with the number of identical signs equal to three, corresponds to a stable process - a constant trend. Additional condition A; It does not affect the process of the absence of a trend, i.e. also don't rock it.

Using the proposed method does not require the development of any special equipment. Virtually all modern automatic machines are equipped with part size measuring instruments and digital control systems, in which it is not difficult to set up a program for implementing the method.

As can be seen from the example, a larger or smaller trend value corresponds to a larger or smaller value of the value of the sub-adjustment impulse. If the trend drops to zero, the adjustment stops, however, the monitoring of the process continues.

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Claims (2)

1. A method of dimensional pulsating adjustment, which consists in applying an impulse A; adjustments in each i-th machining cycle, the sign of which is opposite to the sign of the resulting deviation from the critical limit of the size of the last manufactured part, characterized in that, in order to increase the machining accuracy, impulse A; vary in magnitude depending on the combination of signs of the size deviation in a sliding sample of several parts processed last, with the current value of the pulse decreasing with the minimum number of identical characters in the sample and increasing with the maximum. 2. The method according to claim 1, in which the impulse is changed by the formula 2S BUT, Ai, r; 0 sample size is taken equal to four, ftien 0.5, and the coefficient g is taken equal to R one signs if two are the same; r 1, if the same characters are three, 1 2, if the same characters   four, and with discrete sub-adjustments A ,, take A | and A; BUT Oh if a  about if A;, O g; A 2