SU1249421A1 - Device for thermoelectric checking of local inhomogeneity of metals and alloys - Google Patents

Abstract

The invention relates to a non-1e-drying control of the properties of metals and alloys and can be used to control chill on cast iron, structural and chemical heterogeneity on the surface of the product. The purpose of the invention is to automate and increase measurement performance. The device contains a sensor 1 with a group of hot electrodes 2, one end of which is enclosed in a common heating - TBj ib 3, while others have a common refrigerator 4, a cold electrode made in the form of a replaceable cup 5 with a through hole and guides 6, a folding clamp consisting of a pusher 7, a spring 8, a clamp 9 and a housing 1 O, a switch by the next connection of electrodes and a measuring system. The cold ends of the electrodes of the sensor 1 are connected to the measuring system through the switch 1. To conduct a check on (C (L to 4 CO 4a S

Description

more points than the number of electrodes, rotate the product through an angle ft / ь or 21t / and radians, where n is the number of radians, for

I

The invention relates to non-destructive testing of the properties of metals and alloys and can be used to control chill out on cast iron, structural and chemical heterogeneity on the surface of the product.

The purpose of the invention is to automate and increase productivity of measurements.

The drawing shows a diagram of the proposed device for thermoelectric control of local heterogeneity of metals and alloys,

The device contains a multi-electrode thermoelectric sensor B comprising a group of hot electrodes -2, one ends of which are enclosed in a common heater 3, and others have a common refrigerator 4, a cold electrode made in the form of a replaceable cup 5 with a landing nest for mounting sensor 1 and 6, which are made in accordance with the outer contour of the tested product, a folding clamp consisting of a pusher 7, a spring 8, a clamp 9 and a housing 10, a switch II, a measured signal converter 12, an amplifier 13, a block 14 cf Avneni measured signal with a threshold, block 15 product screening. Between the cold electrode 5 and the pusher 7, there is a device for rotating the product, consisting of the grip 16 of the product, and a turning mechanism 17. The movement mechanisms of the pusher 7 of the pressing grip 16 of the product and the turning mechanism 17 are not shown.

The device works as follows.

To control the batch of items, the device must be prepared. Multi-electrode sensor 1, in which |) the position of hot electrodes

which, at the end of the pusher, set the grip 16 of the product and the swivel mechanism 17. 1 3.p, f-ly, 1 ill.

corresponds to the points of the surface to be controlled, is fixed in the cold electrode 5, filled in the cup with a hole for

passing the hot electrodes 1. In the cold electrode 5, guides 6 are installed, made in accordance with the external circuit of the test product 18. Then the electrical circuit for heating the hot electrodes and water for cooling the cold ends of the sensor 1 electrodes are activated. When the hot electrodes reach the specified temperature

a guide 18 is placed in the guides 6. The controlled surface of the product 18 is aligned with the hot ends of the electrodes of the sensor 1 and is pressed against the electrodes of the pusher

7 clamp which is fixed

a latch 9. The switch 11 alternately connects the electrodes of the sensor 1 to the measuring system. From the switch 11, the signal goes through the converter 12 of the measured signal and the amplifier 13 to the signal comparison unit 14, into which a threshold signal, i.e. experimentally determined

For this batch of products the limit value of thermo-emf. In this block, the measured signal is compared with the threshold signal. Upon receipt of the signal from the comparator unit, the product inspection unit 15 conducts the inspection of the tested products and sends a signal to the switch 11, which returns the circuit to the start-up mode while monitoring the next product.

Product) 8 is rejected if there is a deviation of the structure from the reference at least in one controlled local area. The part of the product with a structure defect can be auto ™

Mathematically marked with a special tool.

In order to control the product at a greater number of points than the number of electrodes, it is applied to rotate the product through an angle П / и or 2ТГ / and radians, where the number of electrodes. After this, it is necessary to remove the pusher 7 from the controlled product 18 after turning on the product control and turn on the gripping drives 16 of the product and the rotary mechanism 17. After turning the product 18 at a predetermined angle, the product grip 16 is removed and the pusher 7 of the clamping device presses product 18 to the hot electrodes of the sensor D followed by quality control of the product.

Claims (1)

Invention Formula 1. Device for thermoelectric control of local heterogeneity of metals and alloys, containing a sensor; with a group of hot elekt12494214 genera made of the same material, one ends of which are enclosed in a common heater, while others have a common refrigerator, cold 5 electrode and measuring system, characterized in that, for the purpose of automation and increasing the measurement performance, the cold electrode is made in the form of 10 cups with a through hole and guides, and a device equipped with a hinged clamp consisting of a pusher, a spring, a lock and a body, and a switch alternately 15 connecting the electrodes, while the cold ends of the electrodes of the datchgas are connected to the measuring system via a switch alternately connecting the electrodes. 202. A device according to Claim 1, characterized in that a pusher and a pivoting mechanism are installed on the pusher bar.