RU2314187C1 - Temperature measuring apparatus used at circular grinding of parts - Google Patents

Abstract

FIELD: thermometry, possibly measuring temperature in working zone at circular grinding of parts.

SUBSTANCE: device includes digital measuring devices and thermocouples connected to them. Electrode of one thermocouple is arranged under flap in zone of cuttings flying away together with abrasive dust. Electrode of other thermocouple is arranged over worked surface of part neat line of its contact with abrasive wheel and it is provided with thermally insulation tube.

EFFECT: simplified design of apparatus due to integrity of abrasive wheel and absence of electric current collectors, enlarged manufacturing possibilities due to monitoring local heating of ground surface and of cuttings with abrasive dust, optimized process of circular grinding.

2 dwg

Description

The invention relates to thermometry, is intended to measure temperatures in the processing zone during round grinding of parts and can be used to optimize grinding processes.

A device for measuring the surface temperature in the processing zone during grinding [1], comprising a grinding abrasive wheel with plate electrodes of thermocouples placed therein, which are connected using conductors, a current collector and a switch to an electronic data processing unit. The electrodes are placed in the slotted grooves of the circle at an angle to the axis of rotation and periodically close through the surface of the workpiece, providing a measurement of the surface temperature during grinding.

The disadvantage of this device is the great difficulty of placing thermocouple electrodes, conductors and current collector in the abrasive wheel, as well as their weakening of the circle and its possible imbalance.

The problem to which the invention is directed, is to simplify the device and expand the capabilities of controlling the change in temperature of local heating of the grinded surface and chips with abrasive dust during processing of the workpiece.

This is achieved by the fact that in the device for measuring temperatures during round grinding of parts containing digital measuring instruments and thermocouples connected to them, the electrode of one thermocouple is located under the visor in the zone of ejection of chips with abrasive dust, and the electrode of another thermocouple is located above the treated surface near the line the contact of the abrasive wheel with the workpiece and has a thermally insulating tube.

The invention is illustrated by drawings.

Figure 1 shows a side view of a device for measuring temperature during grinding of round billets of parts. Figure 2 shows a front view.

The device comprises an electrode 1 of a thermocouple 2, mounted in a sleeve 3 of the holder 4, which is mounted on the casing 5 of the abrasive wheel 6. The electrode is located above the machined surface of the workpiece 7 near the line of its contact with the circle. The position of the sleeve is infinitely adjustable in height and angle. Thermocouple 2 is connected to a digital measuring device 8.

The thermocouple electrode 9 is fixed in two bushings 11 of the holders 12 mounted on the casing 5 and has a protective visor 13 made of a thin copper sheet bent at an acute angle.

The rigidity of the fastening of the visor and the electrode located in it is ensured by the use of two bushings and two holders for their installation. The position of the visor with the electrode can be adjusted relative to the circle and the workpiece by turning the brackets 12 and moving the bushings 11.

The thermocouple 10 is connected to the measuring device 14. The switch 15 allows you to turn off the device 14 and switch the electrode 9 to the device 8 to measure the average temperature in the grinding zone of the workpiece.

Improving the accuracy and speed of measuring the temperature of chips with abrasive dust is achieved by making the electrode 9 extended to the width of the circle due to the connection of two conductors of the thermocouple in a flattened form 10. The use of a protective visor allows not only to protect the electrode from abrasive wear, but also to accumulate heat in the area of chip discharge with abrasive dust.

To improve the accuracy and speed of measuring the temperature of the treated surface of the workpiece and protect the electrode 1 from the action of the cutting fluid, the electrode is equipped with a heat-insulating tube 16 having an oblique cut at the end facing the surface of the workpiece. The tube enters the sleeve 3 and is adjustable in height. The small diameter of the electrode 1 allows you to bring its end close to the line of contact of the circle with the workpiece.

The device operates as follows. During grinding of the workpiece at the position of the switch 15 shown in figures 1 and 2, the current from the electrodes 1 and 9 is supplied to digital measuring instruments. The device 8 shows the change in the heating temperature of the treated part area near the line of contact of the circle with the workpiece, and the device 14 shows the change in temperature of the chips with abrasive dust.

When the thermocouple 10 is switched by the switch 15 to the measuring device 8, the latter shows the average temperature in the grinding zone.

The use of two digital measuring devices in the device allows simultaneous measurement of the temperatures of the treated surface and the ejected chips with abrasive dust. Comparison of the values of these temperatures makes it possible to judge the state of the abrasive wheel.

Simplification of the design of the device is provided due to the fact that it does not violate the integrity of the abrasive wheel and there are no current collectors. This makes it possible to carry out not only laboratory temperature measurements in the zone of circular grinding of parts, but also to use the device in production conditions for indirect monitoring of the condition of the wheel. When using sophisticated digital measuring instruments in the device, it is possible to visualize, record and print out the results of temperature measurements in the grinding zone, as well as to sound an alarm when the temperature exceeds the permissible level.

The temperature measurement in the processing zone during the grinding of parts using the proposed device allows you to expand the ability to control the temperature changes of local heating of the grinding surface and chips with abrasive dust, and due to this, to optimize processes during grinding of parts, as well as diagnosing the condition of the abrasive wheel .

Information sources

1. Copyright certificate of IPC G 01 K 7/02, 13/08. A device for measuring surface temperature during grinding / M.G. Postrigailo, A.A. Klyukin /, SU 1642269 A 1, Decl. 11/15/88, publ. 04/15/91. Bull. No. 14.

Claims (1)

A device for measuring temperatures during circular grinding of parts, containing digital measuring instruments and thermocouples connected to them, characterized in that the electrode of one of the thermocouples is located under the visor in the zone of ejection of chips with abrasive dust, and the other electrode is above the machined surface of the part near its contact line with an abrasive wheel and has a heat-insulating tube.

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