Workpiece carburizing process for adjusting interference image system by introducing gas

Abstract

The invention relates to the technical field of heat treatment, in particular to a workpiece carburizing process for introducing gas to adjust an interference image system, which comprises a carburizing furnace, and two opposite glass windows are arranged on two opposite side walls of the carburizing furnace; the interferometer system is provided with a beam splitter and a reflecting mirror, and a light path between the beam splitter and the reflecting mirror penetrates through the two glass windows; the interferometer system further comprises an interference light path stroke difference fine tuning system. The interference light path stroke difference fine tuning system comprises a glass container for accommodating sulfur hexafluoride, two ends of the glass container are flat and transparent, and the glass container is arranged on a light path between the beam splitter and the reflector; the interference light path stroke difference fine adjustment system further comprises an air pump for adjusting the air pressure in the glass container, and the air pump is connected with a sulfur hexafluoride gas source; the acetylene concentration change can be measured more accurately, the acetylene concentration controlled by the gas adding system and the gas exchange system is more accurate, the acetylene gas composition in the carburizing furnace is more stable, and the workpiece carburizing quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat treatment, and particularly to carburizing of workpieces. Background Art

[0002] Carburizing the workpiece can enhance the wear resistance, fatigue resistance and high-temperature resistance of the workpiece handle. After carburizing, a hardened carbide layer is formed on the surface of the workpiece, which can reduce wear and crack generation, thereby extending the service life of the workpiece.

[0003] Maintaining the geometric accuracy of the workpiece during the carburizing process is a highly challenging task. Carburizing itself is a high-temperature and long-cycle process. Carburizing continuously consumes gas, and the gas composition in the carburizing furnace changes, which will lead to a decline in the quality of workpiece carburizing. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the specification of this application, to avoid obscuring the purpose of this part, the abstract and the title of the invention. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the problems existing in the above-mentioned prior art, the present invention is proposed.

[0006] To solve the above technical problems, the present invention provides the following technical solutions; A workpiece carburizing process introducing a gas regulation interference image system, including a carburizing furnace. A workpiece clamping tooling is arranged in the inner cavity of the carburizing furnace. The carburizing furnace has a gas addition system for adding acetylene and a gas exchange system; Two opposite glass windows are arranged on two opposite side walls of the carburizing furnace; It further includes an interferometer system. The interferometer system has a beam splitter and a reflector. The optical path between the beam splitter and the reflector passes through the two glass windows; The interferometer system further includes an interference optical path travel difference fine-tuning system; The interference optical path travel difference fine-tuning system includes a glass container containing sulfur hexafluoride. Both ends of the glass container are flat and transparent. The glass container is arranged on the optical path of the optical path between the beam splitter and the reflector; The interference optical path travel difference fine-tuning system further includes an air pump for adjusting the air pressure in the glass container. The air pump is connected to a sulfur hexafluoride gas source; In the carburizing process: S1: After the acetylene in the carburizing furnace is maintained at the standard carburizing temperature and concentration, the interferometer system is calibrated using the acetylene at the standard carburizing temperature and concentration; Adjust the sulfur hexafluoride gas pressure in the glass container through an air pump, and utilize the physical property that the speed of light in air is greater than that in sulfur hexafluoride to precisely adjust the optical path difference and obtain a standard interference image. S2: When the workpiece in the tooling is carburized in the carburizing furnace, the interferometer system detects the gas in the carburizing furnace through the glass window to obtain the actual interference image. Since acetylene will be continuously consumed to generate waste gas during the carburizing process, the actual interference image changes due to the change in the gas composition in the carburizing furnace. The ventilation system discharges part of the gas with changed composition, and the gas addition system adds acetylene to increase the acetylene concentration, adjusting the actual interference image to be approximately the standard interference image, thus completing the adjustment of the acetylene concentration in the carburizing furnace.

[0007] In the above design, first, by setting the tooling, the shape of the workpiece during the carburizing process is ensured to be stable, thereby improving the quality of the workpiece carburizing.

[0008] During the carburizing process, the ventilation system can discharge part of the gas with changed composition in the carburizing furnace, and the gas addition system can add acetylene to increase the acetylene concentration, ensuring the stability of the acetylene concentration in the internal cavity carburizing atmosphere of the carburizing furnace. Thereby improving the quality of the workpiece carburizing.

[0009] The glass window adopts a window made of sapphire glass. The window made of sapphire glass can withstand the high temperature inside the carburizing furnace.

[0010] The refractive index of air is about 1.0003, and the speed of light in air is generally taken as 3×10 8 m / s.

[0011] The refractive index of light for sulfur hexafluoride (SF6) in the gaseous state is approximately 1.00087 at 25°C (298K), which is a commonly used typical value. At this time, the speed of light is about 2.9987×10 8 m / s. The actual value will vary slightly due to pressure, purity, and specific temperature, and in a fixed container, the higher the sulfur hexafluoride concentration, the higher the refractive index and the slower the speed of light.

[0012] After the gas concentration of sulfur hexafluoride is increased by 10 times, the refractive index of light is about 1.0087, and the speed of light is 2.973×10 8 m / s. The difference in the speed of light from the normal state is 0.0257×10 8 m / s. If the distance between the two ends of the glass container is 10 cm, then it is equivalent to the displacement of the mirror by 0.39 mm. It can achieve the adjustment of a large gas concentration, and a small adjustment of the optical path difference between the beam splitter and the mirror. Furthermore, a high-precision adjustment of the optical path difference is formed.

[0013] When the acetylene in the carburizing furnace changes in concentration, after the interferometer system compares the actual interference image with the standard interference image, it can more accurately measure the change in acetylene concentration. The acetylene concentration controlled by the gas addition system and the air exchange system is more precise, the gas composition of acetylene in the carburizing furnace is more stable, and the quality of workpiece carburizing is further improved.

[0014] Preferably, the side wall of the glass container is provided with a gas supply port and a gas release port. The gas supply port is connected to the outlet of the air pump, and the suction port of the air pump is connected to the inner cavity of the sulfur hexafluoride gas source. It further includes a pressure sensor, and the sensing head of the pressure sensor is arranged in the glass container. A pressure relief valve is arranged in the gas release port, and the gas release port is connected to a gas recovery system. Through the air pump and the pressure relief valve, the concentration of sulfur hexafluoride gas in the glass container can be adjusted. The pressure sensor measures the air pressure and calculates the concentration of sulfur hexafluoride gas in the glass container, thereby improving the control accuracy of the change in the gas concentration in the glass container. The gas recovery device can recover sulfur hexafluoride to save costs.

[0015] Preferably, the fine-tuning system for the optical path travel difference of the interferometer further includes a temperature control system for controlling the temperature of sulfur hexafluoride in the glass container; the temperature control system includes a semiconductor refrigeration sheet wrapped outside the glass container; the temperature control system further includes an infrared thermal sensor, and the infrared thermal sensor is arranged on the oblique side of one end of the glass container far from the carburizing furnace at both ends of the glass container, and the sensing end of the infrared thermal sensor points to the inner cavity of the glass container. The concentration of sulfur hexafluoride is obtained by measuring the air pressure with a pressure sensor, and the air pressure change of the glass container will vary with the temperature change. After the concentration of the glass container increases, the temperature will increase. According to the temperature measured by the infrared thermal sensor, the temperature of the glass container can be reduced through the semiconductor refrigeration sheet, and the temperature of the glass container can be adjusted to maintain the temperature of sulfur hexafluoride in the glass container constant, improving the measurement accuracy of the pressure sensor, thereby improving the accuracy of the concentration adjustment of sulfur hexafluoride gas and making the measurement accuracy of the interferometer system higher.

[0016] Preferably, the temperature control system further includes a heat insulation layer wrapped outside the glass container, and the heat insulation layer wraps the semiconductor refrigeration sheet; the heat insulation layer avoids both ends of the glass container; the glass at both ends of the glass container adopts vacuum heat insulation glass. The heat insulation layer reduces the influence of the external temperature on the temperature change of the glass container, reduces the temperature fluctuation of the glass container, and improves the accuracy of the concentration adjustment of sulfur hexafluoride gas.

[0017] Furthermore, the temperature control system further includes a heating wire, and the heating wire is wound around the side wall of the glass container, and the heat insulation layer wraps the heating wire. The heating wire can increase the temperature of the glass container, heat the glass container according to the temperature measured by the infrared thermal sensor, and maintain the temperature of sulfur hexafluoride in the glass container constant.

[0018] Preferably, the cross-sectional area of the inner cavity of the glass container is greater than 4 square centimeters; the length of the inner cavity of the glass container is not less than 10 centimeters. By providing a glass tube with a larger volume, more gas is required to change the gas concentration in the glass container. This allows for the use of an air pump with not very high precision to achieve precise adjustment of the gas concentration.

[0019] Preferably, the two ends of the glass container are perpendicular to the split laser between the beam splitter and the mirror. This ensures the accuracy of the measurement of the interferometer system.

[0020] Preferably, the glass window is a circular glass window, and the area of the glass window is less than 12 square centimeters. Reducing the size of the glass window can reduce the heat dissipation of the carburizing furnace from the glass window.

[0021] Preferably, a support frame for the support tooling is provided in the inner cavity of the carburizing furnace. A positioning groove is provided on the support frame, and the tooling is fitted in the positioning groove; the tooling has two open sides, and the two open sides are arranged opposite to each other; the optical path between the beam splitter and the mirror passes through the two open sides of the tooling. This ensures that the interferometer system can measure the acetylene concentration at the tooling in the positioning groove, ensuring that the acetylene concentration presented in the actual interference image is the acetylene concentration near the workpiece. The adjustment of the acetylene concentration is more precise, improving the quality of workpiece carburizing.

[0022] Preferably, a circulation fan is also provided in the carburizing furnace, and the air outlet of the circulation fan faces the open side of the tooling. This ensures that the gas diffuses from the tooling, ensuring that the acetylene concentration presented in the actual interference image is more precise and improving the quality of workpiece carburizing.

[0023] Preferably, the workpiece has a workpiece handle. The tooling is provided with a lower abutting block, a downward pressing mechanism, and a clamping mechanism; the lower abutting block abuts below the workpiece handle, the downward pressing mechanism presses one end of the workpiece handle in the tooling, the clamping mechanism clamps the other end of the workpiece handle in the tooling, and the lower abutting block is arranged between the downward pressing mechanism and the clamping mechanism. This facilitates the positioning of the workpiece handle, reduces the carburizing deformation of the workpiece handle, and improves the carburizing quality.

[0024] Preferably, the carburizing furnace is provided with an air compressor system for adjusting the air pressure in the carburizing furnace. The air compressor system maintains the constancy of the air pressure in the carburizing furnace, improving the quality of workpiece carburizing.

[0025] In summary, the present invention has the following beneficial effects: By providing the tooling, the gas addition system, and the air exchange system, the stability of the acetylene concentration in the carburizing atmosphere inside the carburizing furnace during the carburizing process is ensured, thereby improving the carburizing quality.

[0026] By setting up an interferometer system, the glass container of the interference optical path travel difference fine-tuning system can, after adjusting the gas concentration of sulfur hexafluoride, achieve the adjustment of a relatively large gas concentration and a relatively small adjustment optical path difference between the beam splitter and the mirror. Therefore, the adjustment accuracy is greatly improved, and the standard interference image is imaged more precisely. After comparing the actual interference image with the standard interference image, the change in the concentration of acetylene is obtained more precisely, and the gas addition system and the gas exchange system can control the acetylene concentration more accurately, greatly improving the quality of workpiece carburization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them: Figure 1 FIG. is a schematic structural diagram of a workpiece carburization process of an introduced gas-adjusting interference image system of the present invention; Figure 2 FIG. is an external structural diagram of a workpiece carburization process of an introduced gas-adjusting interference image system of the present invention; Figure 3 FIG. is a schematic diagram of the actual application structure of a workpiece carburization process of an introduced gas-adjusting interference image system of the present invention.

[0028] In the figure, 1 is a carburizing furnace; 11 is a glass window; 12 is a support frame; 121 is a positioning groove; 13 is a circulation fan; 2 is a tooling; 3 is a beam splitter; 4 is a mirror; 5 is a glass container; 6 is an air pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the above objects, features, and advantages of the present invention more understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the drawings of the specification.

[0030] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0031] Secondly, the present invention will be described in detail in conjunction with the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general scale, and the schematic diagrams are only examples, and they should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0032] Next, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures or characteristics that may be included in less than one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or selectively exclusive embodiments from other embodiments.

[0033] Embodiment 1, referring to Figures 1 - 3 , a workpiece carburizing process introducing a gas-regulated interference image system, including a carburizing furnace 1, wherein a tooling 2 for clamping a workpiece is arranged in the inner cavity of the carburizing furnace 1, the carburizing furnace 1 is provided with a gas addition system for adding acetylene, and a gas exchange system.

[0034] A tooling 2 for clamping a workpiece is arranged in the inner cavity of the carburizing furnace 1; The carburizing furnace 1 is provided with a gas addition system for adding acetylene, and a gas exchange system; Two opposite glass windows 11 are arranged on two opposite side walls of the carburizing furnace 1; It further includes an interferometer system, the interferometer system has a beam splitter 3 and a mirror 4, and the optical path between the beam splitter 3 and the mirror 4 passes through the two glass windows 11; The interferometer system further includes an interference optical path travel difference fine-tuning system; The interference optical path travel difference fine-tuning system includes a glass container 5 containing sulfur hexafluoride, both ends of the glass container 5 are flat and transparent, and the glass container 5 is arranged on the optical path between the beam splitter 3 and the mirror 4; The interference optical path travel difference fine-tuning system further includes an air pump 6 for adjusting the air pressure in the glass container 5, and the air pump 6 is connected to a sulfur hexafluoride gas source; In the carburizing process: S1: After the acetylene in the carburizing furnace 1 is maintained at the standard carburizing temperature and concentration, the interferometer system is calibrated with the acetylene at the standard carburizing temperature and concentration; The air pressure of sulfur hexafluoride in the glass container 5 is adjusted by the air pump 6, and by using the physical property that the speed of light in air is greater than that in sulfur hexafluoride, the optical path difference is precisely adjusted to obtain a standard interference image; S2: When the workpiece in the tooling 2 is carburized in the carburizing furnace 1, the interferometer system detects the gas in the carburizing furnace 1 through the glass window 11 to obtain an actual interference image. Since the acetylene will continuously consume and generate waste gas during the carburizing process, the actual interference image changes due to the change of the gas composition in the carburizing furnace 1. The gas exchange system discharges some of the gas with changed composition, and the gas addition system adds acetylene to increase the acetylene concentration, and adjusts the actual interference image to be approximately the standard interference image, thus completing the adjustment of the acetylene concentration in the carburizing furnace 1.

[0035] In the above design, first, by setting the tooling 2, the shape of the workpiece during the carburizing process is ensured to be stable, thereby improving the quality of the workpiece carburizing.

[0036] During the carburizing process, the gas exchange system can discharge part of the gas with changing composition in the carburizing furnace 1, and the gas addition system can add acetylene to increase the acetylene concentration, ensuring the stability of the acetylene concentration in the internal cavity of the carburizing furnace 1. Thus, the quality of workpiece carburizing is improved.

[0037] The glass window 11 is a window made of sapphire glass. The window made of sapphire glass can withstand the high temperature inside the carburizing furnace 1.

[0038] The refractive index of air is about 1.0003, and the speed of light in air is generally taken as 3×10 8 m / s.

[0039] The refractive index of light in sulfur hexafluoride (SF6) in the gaseous state is about 1.00087 at 25°C (298K), which is a commonly used typical value. At this time, the speed of light is about 2.9987×10 8 m / s. The actual value will vary slightly due to pressure, purity, and specific temperature. And in a fixed container, the higher the concentration of sulfur hexafluoride, the higher the refractive index and the slower the speed of light.

[0040] After the gas concentration of sulfur hexafluoride is increased by 10 times, the refractive index of light is about 1.0087, and the speed of light is 2.973×10 8 m / s. The difference in the speed of light from the normal state is 0.0257×10 8 m / s. If the distance between the two ends of the glass container 5 is 10 cm, then it is equivalent to the displacement of the mirror 4 by 0.39 mm. It can achieve a large adjustment of the gas concentration and a small adjustment of the optical path difference between the beam splitter 3 and the mirror 4. Furthermore, a high-precision adjustment of the optical path difference is formed.

[0041] When the acetylene in the carburizing furnace 1 changes in concentration, after the interferometer system compares the actual interference image with the standard interference image, it can more accurately measure the change in the acetylene concentration. The acetylene concentration controlled by the gas addition system and the gas exchange system is more precise, and the gas composition of acetylene in the carburizing furnace 1 is more stable, further improving the quality of workpiece carburizing.

[0042] The side wall of the glass container 5 is provided with a gas supply port and a gas discharge port. The gas supply port is connected to the outlet of the air pump 6, and the inlet of the air pump 6 is connected to the internal cavity of the sulfur hexafluoride gas source; it also includes a pressure sensor, and the sensing head of the pressure sensor is arranged in the glass container 5; a pressure relief valve is arranged in the gas discharge port, and the gas discharge port is connected to a gas recovery system. Through the air pump 6 and the pressure relief valve, the concentration of sulfur hexafluoride gas in the glass container 5 is adjusted. The pressure sensor measures the air pressure and calculates the concentration of sulfur hexafluoride gas in the glass container 5, thereby improving the control accuracy of the change in the gas concentration in the glass container 5. The gas recovery device can recover sulfur hexafluoride to save costs.

[0043] The interference optical path path difference fine-tuning system further includes a temperature control system for controlling the temperature of sulfur hexafluoride in the glass container 5; the temperature control system includes a semiconductor refrigerating sheet wrapped outside the glass container 5; the temperature control system further includes an infrared thermal sensor, and the infrared thermal sensor is arranged on the oblique side of one end of the two ends of the glass container 5 away from the carburizing furnace 1, and the sensing end of the infrared thermal sensor points to the inner cavity of the glass container 5. The sulfur hexafluoride concentration is obtained by measuring the air pressure with a pressure sensor, and the air pressure change of the glass container 5 will vary with the temperature change. After the concentration of the glass container 5 increases, the temperature will increase. According to the temperature measured by the infrared thermal sensor, the temperature of the glass container 5 can be reduced by the semiconductor refrigerating sheet, and the temperature of the glass container 5 is adjusted to maintain the temperature of sulfur hexafluoride in the glass container 5 constant, improve the measurement accuracy of the pressure sensor, thereby improving the accuracy of the sulfur hexafluoride gas concentration adjustment, and making the measurement accuracy of the interferometer system higher. The heat insulation layer reduces the influence of the external temperature on the temperature change of the glass container 5 and reduces the temperature fluctuation of the glass container 5.

[0044] Preferably, the temperature control system further includes a heat insulation layer wrapped outside the glass container 5, and the heat insulation layer wraps the semiconductor refrigerating sheet; the heat insulation layer avoids both ends of the glass container 5; the glass at both ends of the glass container 5 adopts vacuum insulating glass. The heat insulation layer reduces the influence of the external temperature on the temperature change of the glass container 5, reduces the temperature fluctuation of the glass container 5, and improves the accuracy of the sulfur hexafluoride gas concentration adjustment.

[0045] The heat insulation layer adopts a heat insulation layer of glass fiber cotton.

[0046] Furthermore, the temperature control system further includes a heating wire, and the heating wire is wound around the side wall of the glass container 5, and the heat insulation layer wraps the heating wire. The heating wire can increase the temperature of the glass container 5, heat the glass container 5 according to the temperature measured by the infrared thermal sensor, and maintain the temperature of sulfur hexafluoride in the glass container 5 constant.

[0047] The cross-sectional area of the inner cavity of the glass container 5 is greater than 4 square centimeters; the inner cavity length of the glass container 5 is not less than 10 centimeters. By setting a glass tube with a larger volume, more gas can change the gas concentration in the glass container 5. It is allowed to be equipped with a gas pump 6 with not very high precision to achieve precise gas concentration adjustment.

[0048] Both ends of the glass container 5 are perpendicular to the split laser between the beam splitter 3 and the mirror 4. Ensure the measurement accuracy of the interferometer system.

[0049] During use, after maintaining acetylene in the carburizing furnace 1 at the standard carburizing temperature and concentration, the interferometer system is turned on. The optical path between the beam splitter 3 and the mirror 4 passes through two glass windows 11 of the carburizing furnace 1. First, the distance between the mirror 4 and the beam splitter 3 is adjusted to preliminarily calibrate the interference image. Then, the air pressure of sulfur hexafluoride in the glass container 5 is adjusted by the air pump 6 to precisely adjust the optical path difference and obtain a standard interference image. Then, the workpiece is placed in the carburizing furnace 1 for carburizing. During the constant-temperature carburizing process, the interferometer system detects the gas in the carburizing furnace 1 through the glass windows 11 to obtain the actual interference image. After the actual interference image changes from the standard interference image, the gas exchange system discharges some gases with changed components, and the gas addition system adds acetylene to increase the acetylene concentration, and adjusts the actual interference image to be approximately the standard interference image, completing the adjustment of the acetylene concentration in the carburizing furnace 1.

[0050] The air pressure sensor measures the air pressure and calculates the sulfur hexafluoride gas concentration in the glass container 5. According to the temperature measured by the infrared thermal sensor, the temperature of the glass container 5 can be reduced by the semiconductor refrigeration sheet, and the temperature of the glass container 5 can be increased by the heating wire, which cooperate to keep the temperature of sulfur hexafluoride in the glass container 5 constant. The heat insulation layer and the vacuum heat insulation glass prevent the influence of external temperature changes on the temperature change of sulfur hexafluoride in the glass container 5. The gas recovery device can recover sulfur hexafluoride to save costs.

[0051] Example 2, refer to Figure 1 and Figure 2 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment.

[0052] The glass window 11 adopts a circular glass window 11, and the area of the glass window 11 is less than 12 square centimeters. The size of the glass window 11 is reduced, thereby reducing the heat dissipation of the carburizing furnace 1 from the glass window 11.

[0053] A support frame 12 for supporting the tooling 2 is provided in the inner cavity of the carburizing furnace 1. A positioning groove 121 is provided on the support frame 12, and the tooling 2 is cooperatively arranged in the positioning groove 121; the tooling 2 is provided with two open sides, and the two open sides are arranged opposite to each other; the optical path between the beam splitter 3 and the mirror 4 passes through the two open sides of the tooling 2. Ensure that the interferometer system can measure the acetylene concentration at the tooling 2 in the positioning groove 121, and ensure that the acetylene concentration presented by the actual interference image is the acetylene concentration near the workpiece. The adjustment of the acetylene concentration is more accurate, improving the quality of workpiece carburizing.

[0054] A circulation fan 13 is further provided in the carburizing furnace 1, and the air outlet of the circulation fan 13 faces the open side of the tooling 2. Ensure that the gas diffuses from the tooling 2, ensure that the acetylene concentration presented by the actual interference image is more accurate, and improve the quality of workpiece carburizing.

[0055] The workpiece has a workpiece handle, and the tooling 2 is provided with a lower abutting block, a downward pressing mechanism and a clamping mechanism; the lower abutting block abuts below the workpiece handle, the downward pressing mechanism presses one end of the workpiece handle in the tooling 2, the clamping mechanism clamps the other end of the workpiece handle in the tooling 2, and the lower abutting block is arranged between the downward pressing mechanism and the clamping mechanism. This facilitates the positioning of the workpiece handle, reduces the carburizing deformation of the workpiece handle, and improves the carburizing quality.

[0056] The carburizing furnace 1 is equipped with an air compressor system for adjusting the air pressure in the carburizing furnace 1. The air compressor system maintains the constancy of the air pressure in the carburizing furnace 1 and improves the carburizing quality of the workpiece.

[0057] During use, the circular glass window 11 has a minimized area to reduce the heat dissipation of the carburizing furnace 1 from the glass window 11. The support frame 12 determines the position of the tooling 2 through the positioning groove 121, and also determines the position of the workpiece in the carburizing furnace 1. The optical path between the beam splitter 3 and the mirror 4 passes through the two open sides of the tooling 2. The air outlet of the circulation fan 13 faces the open side of the tooling 2, ensuring that the interferometer system can measure the acetylene concentration at the tooling 2 in the positioning groove 121, and ensuring that the acetylene concentration presented in the actual interference image is the acetylene concentration near the workpiece. The adjustment of the acetylene concentration is more accurate, improving the carburizing quality of the workpiece.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A workpiece carburizing process using a gas-regulated interference imaging system, comprising a carburizing furnace (1), wherein a tool (2) for holding the workpiece is arranged in an inner cavity of the carburizing furnace (1), the carburizing furnace (1) having a gas adding system for adding acetylene, and a gas exchange system, characterized in that: Two opposite glass windows (11) are arranged on two opposite side walls of the carburizing furnace (1); Also included is an interferometer system, the interferometer system having a beam splitter (3) and a reflector (4), wherein the optical path between the beam splitter (3) and the reflector (4) passes through two glass windows (11); The interferometer system also includes an interference optical path travel difference fine-tuning system; The interference optical path travel difference fine-tuning system comprises a glass container (5) containing sulfur hexafluoride, wherein both ends of the glass container (5) are flat and transparent, and the glass container (5) is arranged on the optical path between the beam splitter (3) and the reflector (4); The interference optical path travel difference fine-tuning system also includes an air pump (6) for adjusting the air pressure in the glass container (5), and the air pump (6) is connected to a sulfur hexafluoride gas source; In the carburizing process: S1: After the acetylene in the carburizing furnace (1) is maintained at a standard carburizing temperature and concentration, the interferometer system is calibrated using the acetylene at the standard carburizing temperature and concentration; The sulfur hexafluoride gas pressure in the glass container (5) is adjusted by an air pump (6), and the optical path difference is precisely adjusted by utilizing the physical property that the speed of light in air is greater than the speed in sulfur hexafluoride to obtain a standard interference image; S2: When the workpiece in the tooling (2) is carburized in the carburizing furnace (1), the interferometer system detects the gas in the carburizing furnace (1) through the glass window (11) to obtain an actual interference image. The actual interference image changes because acetylene is continuously consumed during the carburizing process to generate waste gas, and the gas composition in the carburizing furnace (1) changes. The ventilation system discharges part of the gas with changed composition, and the gas adding system adds acetylene to increase the acetylene concentration, so as to adjust the actual interference image to a near standard interference image, thereby completing the adjustment of the acetylene concentration in the carburizing furnace (1).

2. The workpiece carburizing process for introducing a gas to adjust an interference image system according to claim 1, characterized in that: The side wall of the glass container (5) is provided with an air supply port and an air discharge port, the air supply port is connected to the air outlet of the air pump (6), and the air intake port of the air pump (6) is connected to the inner cavity of the sulfur hexafluoride gas source; It also includes an air pressure sensor, wherein the sensing head of the air pressure sensor is arranged in the glass container (5); A pressure relief valve is arranged in the gas relief port, and the gas relief port is connected to a gas recovery system.

3. The carburizing process of the workpiece for introducing a gas to adjust an interference image system according to claim 1, characterized in that: The interference optical path travel difference fine-tuning system also includes a temperature control system for controlling the temperature of sulfur hexafluoride in the glass container (5); The temperature control system includes a semiconductor refrigeration sheet wrapped outside the glass container (5); The temperature control system further comprises an infrared heat sensor, which is arranged at an oblique side of one of the two ends of the glass container (5) that is away from the carburizing furnace (1), and the sensing end of the infrared heat sensor points to the inner cavity of the glass container (5).

4. The workpiece carburizing process for introducing a gas to adjust an interference image system according to claim 3, characterized in that: The temperature control system further comprises a heat insulation layer wrapped around the glass container (5), wherein the heat insulation layer wraps around the semiconductor refrigeration sheet; The heat insulation layer avoids both ends of the glass container (5); The glass at both ends of the glass container (5) is vacuum insulation glass.

5. The carburizing process of a workpiece for introducing a gas to adjust an interference image system according to claim 1, characterized in that: The inner cavity cross-sectional area of the glass container (5) is greater than 4 square centimeters; The inner cavity length of the glass container (5) is not less than 10 cm.

6. The workpiece carburizing process for introducing a gas to adjust an interference image system according to claim 1, characterized in that: The split laser beam between the two ends of the glass container (5) and the beam splitter (3) and the mirror (4) is perpendicular.

7. The workpiece carburizing process for introducing a gas to regulate an interference image system according to claim 1, characterized in that: The glass window (11) is a circular glass window (11), and the area of the glass window (11) is less than 12 square centimeters.

8. The workpiece carburizing process for introducing a gas to regulate an interference image system according to claim 1, characterized in that: A support frame (12) for supporting the tooling (2) is provided in the inner cavity of the carburizing furnace (1). A positioning groove (121) is provided on the support frame (12), and the tooling (2) is fitted in the positioning groove (121); The tooling (2) is provided with two open sides, and the two open sides are arranged opposite to each other; The optical path between the beam splitter (3) and the mirror (4) passes through the two open sides of the tooling (2).

9. The carburizing process of the workpiece for introducing a gas to adjust an interference image system according to claim 8, characterized in that: A circulation fan (13) is further provided in the carburizing furnace (1), and the air outlet of the circulation fan (13) faces the open side of the tooling (2).

10. The workpiece carburizing process for introducing a gas to adjust an interference image system according to claim 1, characterized in that: The carburizing furnace (1) is equipped with an air compressor system for adjusting the air pressure in the carburizing furnace (1).

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