RU1826041C - Method for determining the coefficient of chip shrinkage - Google Patents

Abstract

The invention relates to the field of mechanical engineering. The purpose of the invention is to increase the accuracy and expand the range of materials under study and cutting conditions by determining the shrinkage coefficient of not only drain, but also articular and elemental chips. An area is marked with marks on the treated surface of the test sample, and the distance between the marks, which is the geometric parameter of the sample, is measured. The chips are removed from the surface, a section of the chip with marks is revealed, and the length of the specified section on the chips is measured, i.e. determine the geometric parameter of the chip. The coefficient of longitudinal shrinkage of the chips is determined by the formula K B / B, where B is the geometric parameter of the sample, and B the geometric parameter of the chip. During the cutting process, the distance between the marks will change by the value of the longitudinal chip coefficient; therefore, the method allows direct measurement of chip shrinkage in relation to the geometric parameters of the sample and the chip. In this case, the distance between the marks for the sample is chosen to be shorter than the joint length or half the length of the turn of the element or drain chips, which guarantees the continuity of the chips in the surface area of the part including this section, i.e. This method is acceptable for any ductile materials. 3 ill. yo

Description

The invention relates to mechanical engineering, mainly to metal cutting processes, and can be used to optimize cutting conditions and geometric parameters of cutters in a production environment.

The purpose of the invention is to expand the technological capabilities of the method for determining the longitudinal shrinkage coefficient of chips.

This goal is achieved by the fact that on the treated surface of the test specimen mark the area marks, measure the distance between the marks being

the geometrical parameter of the sample, remove the chips from the surface, reveal the chip section, with marks, and measure the length of the specified section on the chip, i.e. determine the geometric parameter of the chip.

The coefficient of longitudinal shrinkage of the chips is determined by the formula

KL-f. DC

where KL is the coefficient of longitudinal shrinkage of the chips;

B is the geometric parameter of the sample;

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Yu

ON

2

R; geometric parameter of the chip.

During the cutting process, the distance between the marks will change by the value of the longitudinal discharge coefficient. therefore, the method allows direct measurement of chip shrinkage in relation to the geometric parameters of the sample and the chip

Taking into account the type of shavings (drain, joint, element), the mark is made on a section shorter than the length of the separated element or joint shavings, or half the length of the turn of the drain shavings, which ensures continuity of shavings in the surface area of the part including this section, i.e. this method of determining the KOS acceptable for any plastic materials, which explains the expansion of technological capabilities. The marking can be performed by various methods: by coating the paint, drawing, by making a groove of insignificant depth,

In addition, since this method directly measures the geometric parameter before and after chip removal (in the prototype, chip length is measured by applying a flexible thread to it), the accuracy of the results is increased.

Geometrical parameters can be measured by any optical instrument for measuring linear values

Compared with the prototype, the measurement accuracy is improved due to the fact that the directly deformed section is measured, and not through the flexible element, which is used to measure the chips and then measure them

In Fig. 1, a workpiece with a groove made on it is shown: in Fig. 2, shavings: in Fig. 3, a chip zone with a groove.

The method is carried out as follows. For example, at least one groove is cut in the workpiece, for example, in the longitudinal direction, its width B is measured, then the workpiece is cut with a depth greater than the groove depth, then sections with grooves are revealed on the removed chip, the groove width is measured on the formed chip Vi is determined by the coefficient of longitudinal shrinkage of the chip as the ratio of the obtained measurement results

v in

To | - in;

where B is the width of the groove on the workpiece (geometric parameter of the sample);

Sun. na.ia width on the chip (geometric parameter of the chip)

Compared with the prototype of the proposed method has the following advantages.

1. Allows you to measure the coefficient of longitudinal shrinkage not only on the drain, but also on the joint and elemental shavings, i.e. provides broader technological capabilities

2. It has less laboriousness, because it is not necessary to measure the length of the chips of a complex (usually) spatial shape, along which a flexible element is laid, and then, when straightened, the length is measured.

3. More accurate, since it allows the use of precision optical instruments for measurement, the measurement process being simplified and the directly deformed chip section being measured.

4. The absence of any additional devices in the cutting zone, work directly with workpieces, the simplicity of calculating KL by the formula, in which there are no parameters other than two linear ones, determine the effectiveness of the method for finding the optimal geometry parameters and elements of the cutting conditions

Claims (1)

The claims A method for determining the longitudinal shrinkage coefficient of chips, which consists in applying tags to a sample, removing chips from it and measuring the geometric parameter of the chip, according to which, taking into account the geometric parameter of the sample, a coefficient is determined, characterized in that, in order to increase accuracy and expanding the nomenclature of the studied materials and cutting conditions by determining the shrinkage coefficient of not only drain, but also articular and elemental chips, as the geometric parameters of the chip and sample the shortest distance between the marks on them, with the distance of the sample is selected smaller jointed lengths or half lengths of coil element or drain chips. I Np i O-q AND Ръг.З