SU1121102A1 - Method of determining chip srinkage factor - Google Patents

Abstract

A METHOD FOR DETERMINING COFFEE SHEET COFFEE, according to which the parameters of the workpiece and chips are measured, and the shrinkage ratio is defined as the ratio of the measured parameters, characterized by cutting and the wavelength of the vibration trace on the chip, the ratio of which determines the shrinkage factor of the chip.

Description

The invention relates to the field of mechanical engineering and can be used to determine the shrinkage rate of chips in laboratory and working conditions.

A known method for determining chip shrinkage ratio consists in measuring the speed of movement taken to measure the workpiece point and the speed of movement of the corresponding chip point and then determining the coefficient of shrinkage as a ratio of these speeds L1j "

The disadvantage of this method is the low accuracy of chip shrinkage determination in conditions of insufficient stability of the AIDS system, which limits its functionality. In real conditions, the cutting process is always accompanied by vibrations that distort the speed of the chips, and the details. Therefore, an error will be introduced in determining the chip shrinkage ratio. In addition, very expensive equipment is needed to measure the speed of movement of the workpiece and chips, which determines the high labor intensity.

The purpose of the invention is to expand the functionality of the method and reduce the laboriousness of determining the chip shrinkage ratio.

The goal is achieved by the method of determining the chip shrinkage ratio, which measure the parameters of the workpiece and the chip, and the shrinkage factor is defined as the ratio of the measured parameters, taking the vibration wavelength on the cutting surface and the depth of the vibration trace on the chip, as parameters the ratio of which determines the coefficient of shrinkage of chips.

The essence of the method is as follows: a chip is taken at a cutter and measured on it is the wavelength of the vibrating wake, then the wavelength of the vibrating wake formed on the cutting surface is measured. For the material and tool materials, the coefficient of chip shrinkage is determined by the formula:

p zag

t p

where - the coefficient of shrinkage of chips,

PJP ,,. - length of the vibration trace on the cutting surface of the workpiece, mm,

p - the length of the vibration trace on the chip, mm.

Example 1. A cylindrical billet with a diameter of 90 mm from steel 12XH4A is machined on a 1K62 machine with a 114K8 cutter with a cutting part geometry, ,, 8 mm; feed, 11 mm / rev; cutting depth t 0.75 mm in the range of cutting speeds 75-280 m / min. After cutting the workpiece for a length sufficient to produce a piece of chips with a Brinel loupe, the wavelength of the vibrating trace on the cutting surface and the chip is measured. Then, the chip shrinkage ratio is determined by the formula. To increase the reliability of the measurement results, it is recommended that the wavelength of the vibration tracks be taken as the arithmetic average of several measurements.

The measurement results are summarized in table 1.

Example 2. A billet with a diameter of 30 mm of alloy HN55BM1FCYU is machined on a 1K62 machine with a VKBM cutter with a cutting part geometry of 5 °; , 5 mm; feed 5 0.11 mm / rev; cutting depth t 0.75 mm in the range of cutting speed m / min. The remaining operations are carried out analogously to example 1.

The measurement results are summarized in table 2.

The proposed method is simple and does not require the cost of manufacturing special tools and the use of expensive instruments. The time spent on the determination of chip shrinkage on the proposed approximately 3-5 minutes, and the prototype 10-15 minutes. Wavelength of a vibration trace, mm, at

Table 1 cutting speed V, m / min

4.8 6.3 7.3 8.2

1.8 2.2 2.5 3.1 2.66 2.86 2.9 2.65 Wavelength of the vibration trace, mm, with

Billet 1.06 1.4

0.8 0.875 Chips

.14,316,7 12

4.75

6.3

6.3 2.6

2.5 2.3

table 2

1.6

1.8

1.5 cutting speeds V, m / min

Claims (1)

METHOD FOR DETERMINING THE CHIP SHRINKING COEFFICIENT, according to which the parameters of the workpiece and shavings are measured, and the shrinkage coefficient is determined as the ratio of the measured parameters, characterized in that, in order to expand the functionality and reduce labor intensity, the wavelength of the vibration trace on the cutting surface is taken as parameters and the wavelength of the vibration trace on the chips, the ratio of which determines the coefficient of shrinkage of the chips.