RU104710U1 - DEVICE FOR MEASURING TEMPERATURE IN A CUTTING AREA WHEN TURNING BY THE METHOD OF A NATURAL THERMOCOUPLE - Google Patents

Abstract

A device for measuring temperature in the cutting zone, comprising a part, a rotating center, a cutter, to the rear of the cutting plate of which a conductor is soldered, connected to the measuring device, characterized in that the shaft of the rotating center is elongated and a graphite-lubricated bearing is additionally pressed onto it, and to copper conductors are soldered to the inner ring of the bearing and the part, and a conductor is soldered to the outer fixed ring of the bearing, connecting to a copper plate, to which the conductor is soldered, going to the measuring device.

Description

The invention relates to the field of measuring temperature, in particular, measuring the temperature of cutting during turning. The study of cutting processes involves measuring and fixing various phenomena that occur in the technological system.

A device for measuring temperature in the cutting zone of a natural thermocouple [1], consisting of a workpiece and a cutting tool. In the process of cutting at the contact point of dissimilar materials of the product and the cutter due to heating, an electromotive force (EMF) occurs. In this case, thermoEMF is guided through the workpiece through a copper ring, and then through mercury in the bath, which serves to contact the rotating ring with the wire. In this case, the millivoltmeter will show the thermoEMF voltage, by which it is possible to judge the cutting temperature.

The disadvantage of this device is the complexity of manufacture, as well as the use of mercury, which requires the necessary safety measures for the treatment of harmful substances.

The closest adopted for the prototype is a device for measuring the temperature in the cutting zone with a natural thermocouple [2], containing a cutter to which one of the thermoelectrodes is connected, a measuring device that is connected to the workpiece through a current collector using another thermoelectrode.

The disadvantage of this device is the design complexity and the fact that over time the carbon brushes in contact with the copper sleeve will soon oxidize and the signal will be transmitted with an error.

The aim of the invention is to simplify and apply the design of the device for measuring temperature in the cutting zone during turning.

A device for measuring the temperature in the cutting zone, containing a part, a rotating center, a cutter, a conductor connecting to the measuring device is soldered to the back of the cutting insert, characterized in that the shaft of the rotating center is elongated and a graphite lubricated bearing is pressed onto it, copper conductors are soldered to the inner ring of the bearing and the part, and a conductor connecting to the copper plate to which the conductor is soldered is soldered to the outer stationary ring of the bearing, and leading to the measuring device.

Most of the phenomena occurring in the cutting zone are random and very fleeting. To study such processes and phenomena, it is necessary to carry out current control of the parameters of the cutting process with high accuracy. The contact through the bearing with coal lubricant has a high transmittance of thermoEMF due to the low resistance R = 0.1 Ohm. Therefore, to more accurately measure the temperature in the cutting zone, a natural thermocouple design was developed.

Figure 1 shows a General view of the device.

A device for measuring the temperature in the cutting zone during turning by a natural thermocouple method contains a rotating center 1, the shaft of which is made with an elongated front part. On the elongated front of the shaft, of the rotating center 1, a closed bearing 2 is pressed in. Grade 6-50206KSh GOST 8338-57. To transmit a signal through a rolling body system, a grease clogged in the bearing 2 is thoroughly washed with kerosene and graphite grease is clogged in its place. In order to protect the bearing 2 from external influences, as well as to remove contacts from the stationary outer ring of the bearing, a housing 3 is made to which a copper plate 4 is screwed. A copper conductor 5 is soldered to the plate 4 from the outer stationary ring of the bearing 2 and a conductor 6 connected to the contact measuring device 7. A copper sleeve 8 with contact 9 is pressed onto the elongated front part of the shaft 1, to which the conductor 10 is soldered from the inner ring of the additional bearing 2 and the conductor 11 to the workpiece 12. The solder wire 11 to the workpiece 12 is obtained the first part of the natural thermocouple.

The second part of the thermocouple is made directly from a turning feed cutter 13 with the material of the cutting part T5K10 (GOST 18868-73). A conductor 14 connecting the cutter 13 and the contact of the measuring device 7 is soldered to the back of the cutting insert of the cutter 7. By connecting the parts of the natural thermocouple, we obtain a design for measuring the temperature in the cutting zone when turning by the natural thermocouple method.

The principle of operation of this design is that the thermoEMF signal transmission from the rotating part 12 through the conductors 11, 10 is transmitted to the inner ring of the additional bearing 2, which serves as the signal transmission part from the rotating part 12. Then, through graphite lubricant, which improves the transmission of the bearing 2 signal, the signal enters the already stationary outer ring of the bearing 2 and through the conductor 5 soldered to the plate 4, it directly enters the measuring device 7 through the conductor 6.

The proposed installation is used for research when measuring temperatures in the cutting zone during turning.

Information sources

1. Wulf A.M. Metal Cutting: A Textbook for Engineering universities. - M.: Mechanical Engineering, 1973

2. Granovsky G.I., Granovsky V.G. Metal Cutting: A Textbook for Engineering and instrumentation. specialist. universities. - M .: Higher. school., 1985. - 304 p., ill. (prototype).

Claims (1)

A device for measuring the temperature in the cutting zone, containing a part, a rotating center, a cutter, a conductor connecting to the measuring device is soldered to the back of the cutting insert, characterized in that the shaft of the rotating center is elongated and a bearing with graphite lubricant is pressed onto it, copper conductors are soldered to the inner ring of the bearing and parts, and a conductor is connected to the outer stationary ring of the bearing, connecting to the copper plate to which the conductor is soldered, id gnaw on the measuring device.