CN103737436A - Cutting temperature measurement system based on optical fiber sensing - Google Patents

Abstract

The invention discloses a cutting temperature measurement system based on optical fiber sensing, which is characterized in that it comprises a dark box (9) with an opening (91) and a black box (9) that can extend from the opening (91) into the inside of the dark box (9). Spindle head (5), the end of the spindle head (5) is detachably installed with a tool (8), and a hose (7) is fixedly installed on the spindle head (5), and the hose (7) An optical fiber temperature sensor (1) is arranged in the middle, one end of the optical fiber temperature sensor (1) protrudes from one end of the hose (7) close to the cutter (8), and the other end of the optical fiber temperature sensor (1) Protrude from the other end of the hose (7) and connect with the photoelectric conversion circuit (2), the photoelectric conversion circuit (2) is connected with the data acquisition module (3), and the data acquisition module (3) is connected with the Computer (4) is connected. The invention has the advantages of simple structure, reliable performance and high measurement precision.

Description

A Cutting Temperature Measurement System Based on Optical Fiber Sensing

technical field

The invention relates to a temperature measurement system, in particular to a cutting temperature measurement system based on optical fiber sensing.

Background technique

At present, with the needs of modern large-scale production, the cutting speed in machining is required to be faster and faster. However, too fast cutting speed will inevitably generate higher temperatures on the tool and workpiece, and temperature changes will inevitably cause cutting Error, the error caused by temperature change accounts for an increasing proportion of the overall error of machining, and has become one of the main obstacles to further improve machining accuracy. However, the current theoretical research on cutting temperature is still far behind the practical application. Therefore, the study of cutting temperature in high-speed cutting has theoretical value and practical significance.

So far, the measurement methods of cutting temperature generally include contact measurement method, non-contact measurement method and indirect measurement method. Among them, the contact measurement method mainly uses thermocouple measurement. Because its temperature measurement device has the advantages of simple structure and convenient measurement, it has become a widely used and mature method at home and abroad. However, in the long-term use, it is found that the contact measurement method still has certain limitations. The specific performance is that the thermocouple can only measure the point temperature and the average temperature. At the same time, it also has slow response speed and low accuracy. Even defects and problems that are difficult to bury, therefore, limit the use of tactile measurement methods. Non-contact measurement methods mainly include infrared thermal imager method, radiation pyrometer method, infrared photography method, etc. This non-contact measurement method has the advantages of intuitiveness, simplicity, and remote monitoring when measuring temperature. However, it is limited to measuring workpieces, The temperature of the tool surface, and there are defects and problems such as expensive, difficult to determine the emissivity of the material, slow measurement response, poor precision, etc. Therefore, it is difficult to accurately obtain the cutting temperature field by this non-contact measurement method.

Because of its strong anti-interference ability, good insulation, good high temperature resistance and other advantages, optical fiber can be applied to the development of various sensors. Compared with traditional temperature measurement methods, optical fiber temperature measurement has many advantages such as anti-electromagnetic interference, corrosion resistance, good explosion-proof performance, small size, light weight, bendable, high sensitivity, long service life, long transmission distance, and convenient maintenance. The rapid development of optical fiber technology provides very favorable conditions for the application of non-contact temperature measurement in production. Many temperature measurement problems that cannot be solved by thermocouples and conventional infrared thermometers can be solved by fiber optic temperature measurement technology. Especially in the field of high temperature measurement, fiber optic temperature measurement technology has increasingly shown strong vitality. In the application of optical fiber temperature measurement, as early as 1984, the Institute of Automation of the Ministry of Metallurgy (No. 102) began to study the temperature tester based on the colorimetric method. The SW-I colorimetric optical fiber thermometer was developed by the institute. After doing a lot of experiments and theoretical analysis, a fiber-optic infrared colorimetric pyrometer was developed, both of which can meet the design performance indicators. The First Aeronautical Academy of the Chinese Air Force has developed a colorimetric thermometer, which uses pyroelectric detectors to realize online real-time measurement of the flame temperature. Shenyang University of Technology has applied optical fiber temperature measurement technology to detect the temperature in the process of plasma heating and cutting. However, at present, the optical fiber temperature measurement technology has not been applied to the machining process of machine tool cutting at home and abroad. Therefore, there is no research data on the application of optical fiber temperature measurement technology to the temperature measurement of machine tool cutting.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cutting temperature measurement system based on optical fiber sensing with simple structure, reliable performance and high measurement accuracy.

In order to solve the above technical problems, the present invention provides a cutting temperature measurement system based on optical fiber sensing, which includes a dark box with an opening and a spindle head that can extend into the inside of the dark box from the opening, and the end of the spindle head can be A tool is disassembled and installed, and a hose is fixedly installed on the spindle head. An optical fiber temperature sensor is arranged in the hose, and one end of the optical fiber temperature sensor protrudes from one end of the hose and is close to the tool. The other end of the optical fiber temperature sensor protrudes from the other end of the hose and is connected with a photoelectric conversion circuit, the photoelectric conversion circuit is connected with a data acquisition module, and the data acquisition module is connected with a computer.

The flexible pipe is fixedly installed on the main shaft head through a clamp.

A shock-absorbing layer is arranged between the clip and the spindle head.

A heat insulation layer is arranged on the inner wall of the dark box.

Compared with the prior art, the beneficial effects of the present invention are: since the cutting temperature measurement system based on optical fiber sensing of the present invention includes fewer components, the measurement system is simplified and additional devices are reduced, so the measurement is more accurate. Stable, the obtained measurement results are more accurate and reliable.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of dark box shown in Fig. 1;

Fig. 3 is a schematic structural view of the hoop shown in Fig. 1;

In the figure: opening 91, black box 9, spindle head 5, cutter 8, hose 7, optical fiber temperature sensor 1, photoelectric conversion circuit 2, data acquisition module 3, computer 4, heat insulation layer 11, workpiece 12, locking mechanism 13 , Flange hole 15, damping layer 14.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail: a kind of cutting temperature measurement system based on optical fiber sensing, comprises the dark box 9 that a top wall has opening 91, and the top of this dark box 9 is provided with can from opening 91 The spindle head 5 extending into the inside of the dark box 9 is detachably mounted with a tool 8 for cutting workpieces near the end of the dark box 9 , and a clamp that can be fastened to the spindle head 5 is set on the spindle head 5 6. A hose 7 is fixedly installed on the clamp 6, and an optical fiber temperature sensor 1 is arranged in the hose 7. One end of the optical fiber temperature sensor 1 protrudes from the end of the hose 7 and is close to the tool 8. The fiber optic temperature sensor 1 The other end protrudes from the other end of the hose 7 and is connected to the photoelectric conversion circuit 2 , the photoelectric conversion circuit 2 is connected to the data acquisition module 3 , and the data acquisition module 3 is connected to the computer 4 .

It should be further explained that: the optical fiber temperature sensor 1 is installed in the hose 7, which not only can reliably locate the optical fiber temperature sensor 1, but also facilitates the adjustment of the position of the optical fiber temperature sensor 1. As shown in Figure 2, a layer of heat insulation layer 11 is provided on the inner wall of the dark box 9. In practical applications, the material rigidity of the heat insulation layer 11 is required to be relatively large and should not be too thick, and the outer surface in contact with the workpiece should have a larger thickness. coefficient of friction, so that the heat insulation layer 11 can effectively ensure the clamping reliability of the workpiece 12 and reduce the heat loss during the measurement process; and the dark box 9 is made of non-transparent flexible metal material, which can ensure the temperature measurement environment Conducted in a relatively dark room environment, it can not only make the test environment not be affected by external light, but also ensure the integrity of the measurement signal. As shown in Figure 3, the clamp 6 is a non-closed ring structure, and a locking mechanism 13 is provided at both ends, and the locking mechanism 13 can be a hole that is arranged at the two ends to cooperate with the bolt. A flange hole 15 for fixing the hose 7 is provided on the clamp 6, and a shock-absorbing layer 14 is pasted on the surface of the clamp 6 in contact with the spindle head 5, which can reduce the pressure of the machine tool during processing. The impact of vibration on the temperature measurement accuracy of the fiber optic sensor 1.

During use, the workpiece 12 is placed in the dark box 9, and fixed by the vise 10, and the cutting tool 8 goes deep into the dark box 9 to cut the workpiece 12. During the cutting process, the optical fiber sensor 1 close to the cutting tool 8 completes temperature measurement, and will measure The optical signal is transmitted to the computer 4 through the photoelectric conversion circuit 2 and the data acquisition module 3 in turn for holding and processing. In order to achieve higher measurement quality, the position of the optical fiber temperature sensor 1 can be changed by adjusting the hose 7, and the end face normal direction of the optical fiber temperature sensor 1 is perpendicular to the cutting direction of the tool 8, thereby increasing the temperature sensing area of the optical fiber. At the same time, during the cutting process, the moving direction of the optical fiber temperature sensor 1 is parallel to the cutting direction of the tool 8, and moves synchronously with the tool 8, so as to achieve the purpose of follow-up measurement.

The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.

Claims (4)

1. A cutting temperature measurement system based on optical fiber sensing, characterized in that it includes a dark box (9) with an opening (91) and a spindle head that can extend into the dark box (9) from the opening (91) (5), a tool (8) is detachably installed on the end of the spindle head (5), a hose (7) is fixedly installed on the spindle head (5), and the hose (7) is set There is an optical fiber temperature sensor (1), one end of the optical fiber temperature sensor (1) protrudes from one end of the hose (7) close to the cutter (8), and the other end of the optical fiber temperature sensor (1) extends from the The other end of the hose (7) protrudes and is connected to the photoelectric conversion circuit (2), the photoelectric conversion circuit (2) is connected to the data acquisition module (3), and the data acquisition module (3) is connected to the computer ( 4) Connected. 2. The cutting temperature measurement system according to claim 1, characterized in that: the hose (7) is fixedly installed on the spindle head (5) through a clamp (6). 3. The cutting temperature measurement system according to claim 2, characterized in that: a damping layer (14) is arranged between the clamp (6) and the spindle head (5). 4. The cutting temperature measurement system according to any one of claims 1-3, characterized in that: a heat insulation layer (11) is provided on the inner wall of the dark box (9).

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