SU1404894A1 - Method of determining an abrasive wheel wear - Google Patents

Abstract

The invention relates to a measuring technique and can be used in factory laboratories of the metalworking industry. The purpose of the invention is to reduce the complexity of determining the radial wear of abrasive wheels. Wear is determined by rolling two rollers of equal diameter on one soybean, respectively, on worn and unworn circle surfaces. By the magnitude of the misalignment of the mutual arrangement of the rollers, over several revolutions of the circle, the magnitude of its radial, wear is found. 4 il.

Description

The invention relates to a measurement technique, in particular to methods for determining the wear of abrasive wheels, and can be used in factory laboratories of the metalworking industry.

The purpose of the invention is to reduce the laboriousness of determining the average amount of radial wear of an abrasive disc operating under conditions of incomplete contact along the generator of the working surface of the circle with the workpiece when the working surface of the circle after processing remains unworn. ring section by reducing time and number of measurements.

FIG. 1 shows a device implementing the method; in fig. 2 shows section A-A in FIG. one; in fig. 3- section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The device contains two measuring rollers 1 of equal diameter, mounted on the axis 2, the ends of which are fixed in the grooves of the housing 3 with screws 4 At the end of one of the rollers, a arm 5 is fixed parallel to its axis of rotation. Through the hole in this roller with a gap 2-3 mm passes the measuring rod 7, mounted on the end of another roller with the possibility of contact with the flat head 8 of the indicator 6; The housing 3 is mounted on the support 9, located on the axis 10. The ends are later based in the slots of the base 11 and .and: they rest on the springs 12.

The implementation of the method using the proposed device is carried out as follows.

The device is installed on the table of a grinding machine with an abrasive wheel 13 with a worn and unworn (base) surface with a base 11, and the device is brought in before the rollers 1 come in contact with them, which, due to the possibility of turning them together with the housing 3 around the axis 10, self-align on the surface of the circle. Note the indications of the indicator 6, after which the circle is turned by n turns, when rolling the measuring rollers 1 along the circumferences of the abrasive wheel, the roller rolling along the worn area passes a smaller path than the roller

five

0

five

0

five

0

five

0

five

rolling along the unworn area, taken over the measuring base. As a result, there is a mismatch in their relative position, which is used as a parameter by which the wear of the circle is judged. After turning the abrasive wheel at n turns, the indicator reading 6 is again noted. The value of ra-g. the diagonal wear of the wheel is determined by the formula

(A ± C) R J I irTn where A is the difference between the indicator readings

before and after measurement; R is the outer radius of the measuring

rollers;

d is the radius at which the linear position of the rollers is measured relative to each other; C is a permanent device error, determined by preliminary: i experiments by rolling both rollers on an unworn circle and determining a linear mismatch between them. Example. The number of revolutions of the circle p required for the measurement is determined on the basis of preliminary experiments, depending on the required accuracy of determining the wear of the circle.

Determine the wear circle using the proposed device. They make 20 revolutions of a circle (p р p 20). After each i-ro revolution, the indicator readings are recorded and, in acceptance, the wear value V is determined; Then the arithmetic mean value is found.

 | 2 g-1

wear L20 70j20 3.6 microns and its

2. About

variance S2 Z y; -ylV (nnp-1)

 1.2 (20-1) 0.0632 microns. The number of revolutions of the circle n necessary for determining the wear of the circle with a 5% confidence interval Duy probability, 95, is found by the formula t. S

where the value of the criterion t (at, 95 and. P (, p-1 19) is taken equal to 2.09, Thus, for the case under consideration

2.092, 0.0632,

 1z7bgo7o5t iznashiivivma

 s

7. 8

Measuring

a 3 fe "H

 fai one

FIG. 2

eleven

12

8-8

FiL

Claims (1)

isoretum formula The method for determining the wear of an abrasive wheel, which consists in the fact that 5 use the non-wearing part of the wheel as a measuring base, and the wear is determined by the parameter of the worn surface relative to the base, characterized in that, 10 in order to reduce the complexity by reducing the time and number of measurements, simultaneously rolled without. two coaxial rollers of the same diameter, respectively 15 on the worn and unworn sections of the circle, and as a parameter determine the magnitude of the mismatch of the relative position of the rollers.