SU911128A1 - Device for measuring surface roughness in the process of machining - Google Patents

Description

(5) DEVICE FOR MEASURING SURFACE ROUGHNESS DURING THE PROCESS

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The invention relates to a measurement technique, namely, to means for controlling surface roughness.

Apparatus for measuring the surface roughness, the content of the reference element, the measuring transducer, the trace mechanism of the measuring transducer and the processing unit of the measurement results f1 3 are known.

These devices are suitable for measuring roughness of only stationary objects and cannot be used to measure roughness during processing. :

It is also known a device for measuring roughness during processing, comprising a support-drive element made in the form of a cylinder with two flanges, a measuring transducer placed in the support-drive element between the flanges, a mechanism for radial movement of the support-drive element and a unit for processing measurement results, In operation, a known device is brought to a controlled surface before interacting with it the flanges of the supporting-driving element, after which the latter, carried away by the forces of friction, goes into rotation. A measuring transducer, located between the flanges, periodically measures the position of the generatrix at random points, and the processing unit of the measurement results extracts a signal characterizing the surface roughness of G 23.

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The disadvantage (ohm of such a device is low measurement performance, because the device gives one measurement result per one turn of the bearing-drive element, and to obtain a statistically reliable rough characteristics, it is necessary to make at least 300 measurements.

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The aim of the invention is to improve the performance of measurements.

The goal is achieved by the fact that the device is equipped with a mechanism for forcing the support-drive element and a control unit for the mechanisms for forcing and radial movement of the support-drive element.

FIG. 1 shows a general view of the device, a partial section; figure 2 is a sequence diagram of the operation of the device.

The device comprises a housing 1. suspended on flat parallel springs 2 and 3; In the housing on the axis there is mounted a supporting-drive element 5 with two flanges (only one flange 6 is visible in the drawing). Inside the drive element is placed the measuring transducer 7, the measuring tip 8 which interacts with a controlled surface. The meter, converter is connected to the processing unit of the measurement results (not shown). The housing of the device 9 is connected to the mechanism 10 of the radial movement of the support-drive element, made, for example, in the form of an electromagnet. The support-drive element 5 of the th 11 is connected to the drive 12 of the forced rotation of this element. Both mechanisms are connected to the control unit 13. The inputs of this block are connected to control contact groups and 15 interacting with a movable stop 16 mounted on a supporting-drive element.

The device works as follows.

Before the operation of the electron, the nitites of both mechanisms of radial movement and forced rotation of the support-drive element are turned on, the housing 1 is retracted to the extreme right position (Fig. 1), and the measuring tip 8 to the uppermost one. The contact group 15 due to the interaction with the movable stop 16 is open, which sends to the control unit 13 a signal about readiness for operation. After giving the signal to start work, press the Start button) the electromagnets of both mechanisms are de-energized (FIG. 2, time point A), which, under the action of the elasticity of the springs

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2 and 3 will cause a radial movement of the housing 1 until the flanges 6 of the support-drive element 5 touch the surface of the test item (time point B). After touching the flanges, the support-drive element 5 begins to be carried away by the forces of friction and comes into rotation with respect to axis 4. At the time the measuring tip 8 passes through the diametrical plane of the part (time point B in figure 2, the device is shown in figure 1 in this position) The transducer 7 will give a signal to the processing unit of the measurement results to calculate the values characterizing the surface roughness. Upon further rotation of the support-drive element 5, as a result of interaction with the movable stop 16, contact group 1 will be closed, which will activate the electromagnet of the mechanism 10 of the radial movement (time T), and after a time t sufficient to detach the flanges from the tested part (moment time D), and the electromagnet of the mechanism 12 of the forced rotation of the support-drive element. At the end of the forced rotation, contact group 15 will be open, which will cause a repeat of the measurement cycle (time E of the previous measurement cycle corresponds to time A for the next).

Adjusting the position of contact groups 1. and 15 and iT time delays

10-12 measurements can be provided / -.

per one turn of the part, which accordingly increases the measurement performance.

Claims (2)

1.Dunin-Barkovsky I.V. Piezopherifilometry and measurement of roughness. M, Mashgiz, 1961, p. 253,261. 2. German Patent No. 2138289, cl. G 01 B 5/28, 1966 (npototype).