SU1254320A1 - High-frequency strain-gauge dynamometer for measuring dynamic characteristics of microcutting process - Google Patents

Abstract

The invention can be used in the study of force dependencies during microcutting of single particles and grains. The purpose of the invention is to increase the sensitivity and accuracy of measurements. The sectioned body 1 is rigidly connected with supports 4 which are movable in mutually perpendicular directions, the surfaces of which, which are in contact with the strain gages 5, are filled with friction-relief. The strain gages are pressed against the elastic element 2 at the points of its maximum deformation. Abrasive grain 3 puts risks on the rotating sample 8. The signals of the component cutting forces from the dynamometer are transmitted to the screen of a two-beam storage oscilloscope. To reduce the hysteresis, the elastic element 2 and the case of the dynamometer 1 are made of a monolithic solid piece of steel. 1 il.

Description

I1

The invention relates to the measurement of the dynamic characteristics of processes and can be used in the study of force dependencies during microcutting with single grains, in order to determine the optimal grinding conditions and the correct choice of abrasive tool characteristics and technological parameters of the process.

The purpose of the invention is to increase the sensitivity and accuracy of measurements.

The drawing schematically shows a dynamometer, a general view

The dynamometer consists of a sectioned body 1 with elastic element 2, on which abrasive grain 3 is fixed, and rigid supports 4 "Semiconductor strain gauges 5 are located between elastic element 2 and rigid supports A, on the surface of each support contacting with strain gauge, applied a relief grid with a cell size of not more than 0.05 x 0.05 mm, i.e., the surface is made with a friction relief. The supports 4 are fastened with fingers 6, which are pressed into housing 1. Fingers 6 have threads on which nuts 7 are screwed, In order to reduce the effect of gis Theresis sectional case of the dynamometer and the elastic element are made of one monolithic one-piece piece of steel.

The dynamometer works as follows

The strain gages 5 are applied to the elastic element 2 at the places of its greatest deformation in two mutually

Editor A.Gulko

Compiled by V.Rodin Tehred L.Serdkzhova

Order 4711/45 Circulation .778Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Pr-production and printing company, Uzhgorod, st. Project, 4

perpendicular directions and, rotating the nuts 7 on the fingers 6, press them with rigid supports 4 to the elastic element 2, providing the position of the operating point on the linear portion of the characteristic of the strain gauge in the whole range of measured efforts. The depth of the micro-cut is established, then the disk 9 with the sample 8 is given a rotational motion, and the transducer is received, along the rotating disk. At the same time, abrasive grain 3 puts risks (scratches) on sample 8. The amplified signals constituting the resmgs force from the dynamometer are fed to a two-beam storage oscilloscope screen (for example, C8-9A), synchro- nized in rotation frequency, and a pottograph (not shown). .

Claims (1)

Invention Formula thirty A high-frequency dynamometer for measuring the dynamic characteristics of the micro-cutting process 25, comprising a body, an elastic element with an abrasive grain attached to it, and semiconductor strain gauges mounted on an elastic element, so that 35 40 movable in mutually: multi-perpendicular directions of support are rigidly connected with the body, and strain gages are subject in the direction of the abrasive grain to an elastic element, integral with the body, movable supports, and the surface of each onopi-.i ,. tiring with a strain gauge. made with frictional relief. Corrector. A.Zimokosov