A heat treatment process for improving the hardness of medical metal parts

Abstract

The present invention relates to a heat treatment process for improving the hardness of medical metal parts applied in the field of heat treatment, comprising the following steps: S1. pretreatment, S2. carburizing, S3. quenching, S4. low-temperature tempering, S5. post-treatment, and S6. inspection. By adopting the above-mentioned balanced temperature sensing component and the heat treatment intelligent temperature control system, the temperature data of the medical metal parts can be monitored in real time during the carburizing treatment of the medical metal parts, so as to achieve the effect of intelligent temperature control. On the one hand, it can avoid the problem of excessive carbon concentration caused by excessive temperature fluctuation or excessive temperature during the heating process. On the other hand, it can also effectively avoid the problem of too low carbon concentration caused by too low temperature. Therefore, while ensuring the efficiency of the carburizing treatment of the medical metal parts and promoting economic benefits, it can also ensure the carburizing quality and uniformity of the medical metal parts, improve the yield rate, and reduce the heat treatment cost.

Description

Technical Field

[0001] The invention relates to a heat treatment process, and in particular to a heat treatment process applied in the field of heat treatment to improve the hardness of medical metal parts. Background Art

[0002] The basic process of carburizing and quenching includes placing low-carbon steel or low-alloy steel workpieces in a carbon-containing environment and keeping them at a certain temperature for a sufficient time to allow carbon atoms to penetrate into the surface of the steel parts, thereby obtaining high surface hardness and wear resistance, while the core still maintains its original toughness and plasticity. This process not only improves the surface properties of the material, but also helps to extend the service life of the equipment and reduce maintenance costs.

[0003] Among medical metal parts, carburizing and quenching are mainly used for those parts that need to contact human tissue or blood for a long time, such as scalpels, bone saw blades and various puncture needles. These instruments will be subject to varying degrees of friction and wear during use, so they need to have sufficient hardness and wear resistance to ensure their functionality and safety.

[0004] Carburizing quality is one of the key factors to ensure the success of the heat treatment process of medical metal parts. If the carburizing concentration is too high, too low or the uniformity is poor, it will directly cause the subsequent medical metal parts to be scrapped. The main factor affecting these problems is the temperature during the carburizing process. Therefore, how to improve the carburizing quality of medical metal parts and reduce their scrap rate through temperature control is one of the problems that need to be solved urgently. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to improve the carburizing quality of medical metal parts and reduce the scrap rate thereof by temperature control.

[0006] In order to solve the above problems, the present invention provides a heat treatment process for improving the hardness of medical metal parts. The heat treatment process is designed with a heat treatment device, a heat treatment controller arranged on the heat treatment device, a carburizing and quenching box and a movable bottom plate, a heat treatment intelligent temperature control system carried in the heat treatment controller, and a balanced temperature sensing component respectively installed on the front and rear inner walls of the carburizing and quenching box and matched with the heat treatment intelligent temperature control system, and the balanced temperature sensing component is located close to the movable bottom plate.

[0007] The specific steps include:

[0008] S1. Pretreatment: pretreatment of the parts to be processed;

[0009] S2. Carburizing, carburizing the pretreated parts;

[0010] S21. The pretreated parts are placed on a movable bottom plate, and then the heat treatment equipment drives the movable bottom plate to be transferred to the lower end of the carburizing and quenching box;

[0011] S22. The heat treatment intelligent temperature control system controls the carburizing and quenching box to start the heating effect;

[0012] S23. The balanced temperature sensing component collects the temperature rise data in the carburizing and quenching box, and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently controls the temperature rise rate of the carburizing and quenching box according to the received temperature rise data;

[0013] S24. After the temperature in the carburizing quenching box rises to 900°C to 950°C, a carburizing treatment is performed so that carbon atoms penetrate into the surface layer of the pretreated part;

[0014] S25. The temperature-balanced sensing component collects the temperature maintenance data in the carburizing and quenching box, and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently controls the temperature balance of the carburizing and quenching box according to the received temperature maintenance data;

[0015] S3. Quenching, rapid cooling of carburized parts;

[0016] S4. Low temperature tempering: low temperature tempering of quenched parts between 150℃ and 250℃;

[0017] S5. Post-processing: post-processing the low temperature tempered parts to make them meet the precise size and surface requirements;

[0018] S6. Inspection: quality inspection of the parts after post-processing.

[0019] In the above-mentioned heat treatment process for improving the hardness of medical metal parts, the temperature data of the medical metal parts can be monitored in real time during the carburizing process, so as to achieve the effect of intelligent temperature control. While ensuring the efficiency of the carburizing treatment of the medical metal parts and promoting economic benefits, it can also ensure the carburizing quality and uniformity of the medical metal parts and improve the yield.

[0020] As a supplement to the present application, the balanced temperature sensing component includes a balanced temperature sensing strip embedded in the inner wall of the carburizing and quenching box, a temperature sensing cavity is opened in the balanced temperature sensing strip, the left and right inner walls of the temperature sensing cavity are fixedly connected with temperature sensing deformation strips, the two temperature sensing deformation strips are fixedly connected with distance sensing contacts at their respective ends, the temperature sensing deformation strips are filled with thermal expansion fillers, and the inner wall of the temperature sensing deformation strip on the side away from the distance sensing contact is fixedly connected with a distance sensing sheet that cooperates with the distance sensing contact.

[0021] As a supplement to the present application, the heat treatment intelligent temperature control system includes an intelligent temperature control data processing unit, the input end of the intelligent temperature control data processing unit is connected to a temperature rise timing unit, a distance acquisition unit and a distance difference unit, and the output end of the intelligent temperature control data processing unit is connected to an intelligent temperature control unit and a carburizing control unit;

[0022] The input end of the temperature rise timing unit is connected to the timer signal set in the heat treatment equipment, the input end of the distance acquisition unit is connected to the distance sensor signal, the input end of the distance difference unit is connected to the distance acquisition unit signal, the input end of the intelligent temperature control unit is connected to the electric heating structure signal set in the carburizing quenching box, and the input end of the carburizing regulation unit is connected to the carburizing structure signal installed at the rear end of the heat treatment equipment.

[0023] As a further improvement of the present application, the input end of the intelligent temperature control data processing unit is also connected to a temperature rise trigger unit, and the input end of the temperature rise trigger unit is connected to a distance sensing contact signal.

[0024] As a further improvement of the present application, a triggering column is fixedly connected to the inner wall of the temperature-sensitive deformation strip on the side away from the distance sensing contact block, a linkage column is fixedly connected to the inner wall of the temperature-sensitive deformation strip on the side close to the distance sensing contact block, and an auxiliary elastic part is fixedly connected between the left and right inner walls of the temperature-sensitive deformation strip and is sleeved between the triggering column and the linkage column.

[0025] As a further improvement and supplement to the present application, the input end of the intelligent temperature control data processing unit is also connected to an imbalance trigger unit, and the input end of the imbalance trigger unit is connected to the trigger column signal.

[0026] As a further improvement of the present application, the output end of the intelligent temperature control data processing unit is also connected to a filler content control unit, the output end of the filler content control unit is connected to a filler pump signal arranged at the rear end of the heat treatment equipment, the output end of the filler pump is connected to the temperature-sensitive deformation strip through a high-temperature resistant pipe, and the input end of the filler pump is connected to a filler storage signal arranged at the rear end of the heat treatment equipment.

[0027] As another improvement of the present application, the output end of the intelligent temperature control data processing unit is also connected to an abnormal alarm unit and a temperature control data output unit, the output end of the abnormal alarm unit is connected to an alarm signal set on the heat treatment equipment, and the output end of the temperature control data output unit is connected to a data interface signal set on the heat treatment controller.

[0028] In summary, by balancing the setting of temperature sensing components and heat treatment intelligent temperature control system, the temperature data of medical metal parts can be monitored in real time during carburizing treatment, so as to achieve the effect of intelligent temperature control. On the one hand, it can avoid the problem of excessive carbon concentration caused by excessive temperature fluctuations or excessive temperature during the heating process. On the other hand, it can also effectively avoid the problem of low carbon concentration caused by too low temperature. Therefore, it can ensure the efficiency of carburizing treatment of medical metal parts, promote economic benefits, and at the same time ensure the carburizing quality and uniformity of medical metal parts, improve the yield and reduce the cost of heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a heat treatment process flow chart for the first and second embodiments of the present application;

[0030] Figure 2 Axonometric diagram of the heat treatment equipment of the first and second embodiments of the present application;

[0031] Figure 3 This is a control logic diagram of the heat treatment intelligent temperature control system of the first and second embodiments of the present application;

[0032] Figure 4 This is an axonometric cross-sectional view of the carburizing and quenching box and the balanced temperature sensing component when not in operation according to the first and second embodiments of the present application;

[0033] Figure 5 This is a front cross-sectional view of the carburizing and quenching box and the balanced temperature sensing component when not in operation according to the first and second embodiments of the present application;

[0034] Figure 6 This is a front cross-sectional view of the balanced temperature sensing component when not in operation according to the first and second embodiments of the present application;

[0035] Figure 7 It is an axonometric cross-sectional view of a carburizing quenching box and a balanced temperature sensing component during carburizing treatment in the first and second embodiments of the present application;

[0036] Figure 8 This is a front cross-sectional view of a carburizing quenching box and a balanced temperature sensing component during carburizing treatment in the first and second embodiments of the present application;

[0037] Fig. 9 This is a front cross-sectional view of a balanced temperature sensing component during carburizing treatment in the first and second embodiments of the present application;

[0038] Fig.10 This is a state diagram of the balanced temperature sensing component and the distance sensing contact block of the first and second embodiments of the present application when cooperating to sense the temperature balance in the carburizing and quenching box;

[0039] Fig.11This is a state diagram of the first and second embodiments of the present application when the balanced temperature sensing component and the triggering column cooperate to sense abnormal temperature in the carburizing and quenching box.

[0040] Description of the numbers in the figure:

[0041] 1 heat treatment equipment, 11 heat treatment controller, 12 carburizing and quenching box, 2 moving bottom plate, 3 balanced temperature sensing component, 31 balanced temperature sensing strip, 32 temperature sensing cavity, 33 temperature sensing deformation strip, 34 thermal expansion filler, 4 distance sensing contact block, 41 distance sensing sheet, 5 triggering column, 51 linkage column, 52 auxiliary elastic part. DETAILED DESCRIPTION

[0042] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0043] The first implementation method:

[0044] Figure 1 - Fig.11 The heat treatment process for improving the hardness of medical metal parts is shown. The heat treatment process is designed with a heat treatment device 1, a heat treatment controller 11 arranged on the heat treatment device 1, a carburizing and quenching box 12 and a movable bottom plate 2, a heat treatment intelligent temperature control system carried in the heat treatment controller 11, and a balanced temperature sensing component 3 respectively installed on the front and rear inner walls of the carburizing and quenching box 12 and cooperating with the heat treatment intelligent temperature control system, and the balanced temperature sensing component 3 is located close to the movable bottom plate 2.

[0045] The specific steps include:

[0046] S1. Pretreatment: pretreatment of the parts to be treated, such as cleaning and removing surface impurities to ensure the uniformity and efficiency of the carburizing process, or solution treatment to optimize its internal structure;

[0047] S2. Carburizing, carburizing the pretreated parts;

[0048] S21. The pretreated parts are placed on the movable base plate 2, and then the heat treatment equipment 1 drives the movable base plate 2 to be transferred to the lower end of the carburizing and quenching box 12;

[0049] S22. Heat treatment intelligent temperature control system controls the carburizing quenching box 12 to open the heating effect;

[0050] S23. The balanced temperature sensing component 3 collects the temperature rise data in the carburizing and quenching box 12, and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently controls the temperature rise rate of the carburizing and quenching box 12 according to the received temperature rise data; ensuring the uniformity of temperature rise and the effect of low fluctuation during the temperature rise process.

[0051] S24. After the temperature in the carburizing quenching box 12 rises to 900°C to 950°C, carburizing is performed so that carbon atoms penetrate into the surface of the pretreated part;

[0052] S25. The temperature balance sensing component 3 collects the temperature maintenance data in the carburizing and quenching box 12, and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently regulates the temperature balance of the carburizing and quenching box 12 according to the received temperature maintenance data; ensures the temperature balance during the carburizing process, avoids the influence of too high or too low temperature on the carburizing process, and improves the carburizing quality while ensuring the uniformity of the carburized layer

[0053] The key to this step is to control the temperature and time to achieve the ideal carbon content and carburized layer depth. The carburized layer thickness is generally 0.8-1.2mm to obtain the best performance.

[0054] S3. Quenching, which is the rapid cooling of carburized parts. It can be done by quenching or water quenching to obtain high surface hardness and wear resistance;

[0055] During the quenching process, the microstructure of the part undergoes a phase change to form a hard and brittle martensite structure. This step requires precise control of the cooling rate and temperature to avoid excessive deformation or cracking of the part;

[0056] S4. Low temperature tempering: low temperature tempering of quenched parts between 150℃ and 250℃;

[0057] To reduce the internal stress caused by quenching and improve the toughness of the parts, this process helps to stabilize the size and performance of the parts while maintaining high hardness and wear resistance;

[0058] S5. Post-processing: Post-process the parts after low-temperature tempering to make them meet the precise size and surface requirements. The parts may need to be finely ground or otherwise machined to meet the precise size and surface requirements.

[0059] S6. Inspection: Perform quality inspection on the parts after post-processing, such as hardness test, metallographic analysis and other methods to inspect the carburizing and quenching effect, to ensure that the medical device parts meet the expected performance standards. By balancing the temperature sensing component 3 and the intelligent temperature control system for heat treatment, the temperature data of the medical metal parts can be monitored in real time during the carburizing process, so as to achieve the effect of intelligent temperature control. On the one hand, it can avoid the problem of excessive carbon concentration caused by excessive temperature fluctuations or excessive temperature during the heating process. On the other hand, it can also effectively avoid the problem of low carbon concentration caused by too low temperature, thereby ensuring the efficiency of carburizing treatment of medical metal parts, promoting economic benefits, and at the same time, it can also ensure the carburizing quality and uniformity of medical metal parts, improve the yield rate, and reduce the cost of heat treatment.

[0060] Second implementation method:

[0061] Figure 1 - Fig.11 The heat treatment process for improving the hardness of medical metal parts is shown. The balanced temperature sensing component 3 includes a balanced temperature sensing strip 31 embedded in the inner wall of the carburizing and quenching box 12. A temperature sensing cavity 32 is provided in the balanced temperature sensing strip 31. The left and right inner walls of the temperature sensing cavity 32 are fixedly connected with temperature sensing deformation strips 33. The two temperature sensing deformation strips 33 are fixedly connected with a distance sensing contact block 4 at one end thereof. The temperature sensing deformation strips 33 are filled with a thermal expansion filler 34. The thermal expansion filler 34 uses an inert gas with a thermal expansion effect, such as helium. The temperature sensing deformation strips 33 A distance sensing sheet 41 cooperating with the distance sensing contact block 4 is fixedly connected to the inner wall on the side away from the distance sensing contact block 4. Through the cooperation of the temperature-sensitive deformation strip 33 and the thermal expansion filler 34, synchronous temperature change can be achieved during the heating and carburizing treatment of the carburizing quenching box 12. Combined with the distance sensing between the distance sensing contact block 4 and the distance sensing sheet 41, it can effectively assist in judging the uniformity and rate of temperature rise in the carburizing quenching box 12, and effectively realize multi-directional detection and data collection of temperature data.

[0062] Figure 3 The heat treatment intelligent temperature control system includes an intelligent temperature control data processing unit, the input end of the intelligent temperature control data processing unit is connected to a temperature rise timing unit, a distance acquisition unit and a distance difference unit, and the output end of the intelligent temperature control data processing unit is connected to an intelligent temperature control unit and a carburizing control unit;

[0063] The input end of the temperature rise timing unit is connected to the timer signal arranged in the heat treatment equipment 1, the input end of the distance acquisition unit is connected to the distance sensor 41 signal, the input end of the distance difference unit is connected to the distance acquisition unit signal, the input end of the intelligent temperature control unit is connected to the electric heating structure signal arranged in the carburizing quenching box 12, and the input end of the carburizing regulation unit is connected to the carburizing structure signal installed at the rear end of the heat treatment equipment 1. Through the setting of the intelligent temperature control data processing unit, the temperature in the carburizing quenching box 12 can be intelligently controlled according to the temperature change data it receives, effectively avoiding the occurrence of excessive temperature fluctuations, too high temperature or too low temperature, ensuring the uniformity of the temperature inside the carburizing quenching box 12, and then effectively ensuring the uniformity and carburizing concentration of the carburizing layer of medical metal parts, ensuring the heat treatment quality of medical metal parts, and improving the yield rate.

[0064] It should be noted that the electric heating structure and the carburizing structure are both existing technologies, which are directly quoted here without making any changes to their structures and principles. The electric heating structure can be a structure with electric heating wire auxiliary heating, a hot air auxiliary heating structure, etc., and the carburizing structure can adopt a gas carburizing structure, etc. The technicians in this field can select and set it according to their needs, so it will not be elaborated here.

[0065] Figure 3 and Fig. 9 It is shown that the input end of the intelligent temperature control data processing unit is also connected to a temperature rise trigger unit, and the input end of the temperature rise trigger unit is connected to the signal of the distance sensing contact block 4. The setting of the temperature rise trigger unit can effectively assist the intelligent temperature control data processing unit to determine the temperature rise node, thereby realizing the data feedback function of the temperature control, further verifying the temperature control data, and ensuring the effectiveness of the intelligent temperature control.

[0066] Figure 4 - Fig.11 It is shown that a triggering column 5 is fixedly connected to the inner wall of the temperature-sensitive deformation strip 33 on the side away from the distance sensing contact block 4, a linkage column 51 is fixedly connected to the inner wall of the temperature-sensitive deformation strip 33 on the side close to the distance sensing contact block 4, and an auxiliary elastic member 52 is fixedly connected between the left and right inner walls of the temperature-sensitive deformation strip 33 and is sleeved between the triggering column 5 and the linkage column 51. The setting of the triggering column 5 and the linkage column 51 can trigger the carburizing quenching box 12 when the temperature uniformity is unbalanced due to abnormal temperature control, so that the intelligent temperature control data processing unit can collect abnormal conditions, adjust the temperature control data in time, and ensure the safety of temperature control during the carburizing process of medical metal parts.

[0067] Figure 3 and Fig.11 It is shown that the input end of the intelligent temperature control data processing unit is also connected to an imbalance trigger unit, and the input end of the imbalance trigger unit is connected to the trigger column 5 signal. The setting of the imbalance trigger unit can collect and feedback the trigger data of the trigger column 5 and the linkage column 51, thereby improving the efficiency of abnormal data collection and judgment. On the one hand, it can increase the data verification effect, and on the other hand, through the triggering of the imbalance data, the intelligent temperature control data processing unit can adjust the temperature control data of the carburizing quenching box 12 in time, thereby ensuring the effectiveness of temperature control and regulation, improving the efficiency of its abnormal response, and reducing the impact of temperature imbalance on the carburizing quality of medical metal parts.

[0068] Figure 3It is shown that the output end of the intelligent temperature control data processing unit is also connected to a filler content control unit, and the output end of the filler content control unit is connected to the filler pump signal arranged at the rear end of the heat treatment equipment 1, and the output end of the filler pump is connected to the temperature-sensitive deformation strip 33 through a high-temperature resistant pipeline, and the input end of the filler pump is connected to the filler storage signal arranged at the rear end of the heat treatment equipment 1. The setting of the filler content control unit can effectively realize the content of the thermal expansion filler 34 filled in the temperature-sensitive deformation strip 33 according to the temperature control data, thereby ensuring the effectiveness of the trigger data generated by the distance sensing contact block 4 driven by the thermal expansion of the thermal expansion filler 34, and the consistency with the temperature control node, thereby ensuring the data reliability of the temperature rise trigger unit and improving the accuracy and effectiveness of data monitoring.

[0069] Figure 3 It is shown that the output end of the intelligent temperature control data processing unit is also connected to an abnormal alarm unit and a temperature control data output unit. The output end of the abnormal alarm unit is connected to the alarm signal set on the heat treatment equipment 1, and the output end of the temperature control data output unit is connected to the data interface signal set on the heat treatment controller 11. When the temperature control continues to be abnormal, the abnormal alarm signal can be transmitted through the abnormal alarm unit, which is convenient for the staff to check the heat treatment equipment 1 in time, process the abnormal data, take effective improvement measures, and reduce the losses caused by the abnormality. In addition, the setting of the temperature control data output unit can effectively output the data of the entire temperature control process, which is convenient for the staff to improve the heat treatment process according to the temperature control data, and promote the continuous development of heat treatment technology for medical metal parts.

[0070] Figure 1 - Fig.11 It is shown that before the heat treatment equipment 1 starts working, the staff adjusts the temperature control parameters in the intelligent temperature control data processing unit through the heat treatment controller 11, and sets the temperature rise data, temperature rise gradient, temperature rise time, carburizing temperature, carburizing temperature fluctuation range and carburizing time. Then, the intelligent temperature control data processing unit first sends a control instruction to the filler content control unit according to the received heat treatment data, so that the filler content control unit starts the filler pump, and extracts the thermal expansion filler 34 in the filler storage through the filler pump and transports it to the temperature-sensitive deformation strip 33, so as to maintain the consistency and stability of the content of the thermal expansion filler 34 in the temperature-sensitive deformation strip 33, so that the subsequent intelligent temperature control data processing unit can judge and subsequently control the temperature control state in the carburizing quenching box 12 according to the data generated by the thermal expansion deformation of the temperature-sensitive deformation strip 33, so as to ensure the accuracy and effectiveness of the intelligent temperature control.

[0071] During the heat treatment process of the medical metal parts by the heat treatment equipment 1, the medical metal parts are placed on the movable bottom plate 2. As the transmission device on the heat treatment controller 11 moves to the bottom of the carburizing and quenching box 12, the intelligent temperature control data processing unit controls the start of the intelligent temperature control unit according to the heat treatment temperature control parameters set by the staff, starts the electric heating structure, and drives the internal temperature of the carburizing and quenching box 12 to continuously increase. After the intelligent temperature control unit is started, the timer starts timing, and the temperature rise data in the carburizing and quenching box 12 is timed and counted, and then the timing data is transmitted to the intelligent control through the temperature rise timing unit. The temperature data processing unit is configured to process the temperature data of the carburizing and quenching box 12, and as the temperature in the carburizing and quenching box 12 continues to rise, the thermal expansion filler 34 will expand and deform as the temperature rises, thereby causing the temperature-sensitive deformation strip 33 to increase in volume and deform. Under the guidance of the temperature-sensing cavity 32, the two temperature-sensitive deformation strips 33 located in the same balanced temperature-sensitive strip 31 deform and move closer to each other, causing the two distance sensing contacts 4 to gradually approach each other, and the distance sensing contacts 4 to gradually move away from the distance sensing sheet 41, and then the distance sensing sheet 41 transmits the distance change data to the distance acquisition unit, and the distance acquisition unit transmits the distance data to the respective The distance difference unit and the intelligent temperature control data processing unit, the intelligent temperature control data processing unit judges the temperature rise fluctuation and the temperature data at this time according to the mean value of the distance data and the timing data, and then when the temperature rise fluctuation is too large, that is, the temperature rise gradient is large, the intelligent temperature control unit sends a temperature control instruction in time, so that the intelligent temperature control unit controls the electric heating structure and controls its heating power, so as to achieve the regulation of the temperature rise fluctuation. At the same time, the distance difference unit judges the temperature difference of the distance data transmitted by the two distance sensing sheets 41 in the same balanced temperature sensing strip 31, and then performs temperature control on the same carburizing The temperature difference data generated by the two balanced temperature sensing strips 31 in the quenching box 12 are calculated, and then the data is transmitted to the intelligent temperature control data processing unit, which judges the uniformity of temperature rise in the carburizing quenching box 12 at this time. When it is judged that there is an error in the temperature in the carburizing quenching box 12, a comprehensive judgment is made based on the temperature difference data and the temperature fluctuation data. The electric heating structure on different surfaces of the carburizing quenching box 12 is regulated by the intelligent temperature control unit, so as to achieve the effect of balancing the temperature in the carburizing quenching box 12, ensure the uniformity of temperature rise in various parts of the medical metal parts, and ensure the subsequent carburizing quality.

[0072] Then, in the continuous heating process, the two distance sensing contacts 4 located in the same balanced temperature sensing strip 31, when the thermal expansion filler 34 acts on the temperature sensing deformation strip 33 to produce thermal expansion volume deformation, produce abutment contact, and then transmit the data generated by the abutment contact to the temperature rising trigger unit, and the temperature rising trigger unit transmits the trigger signal to the intelligent temperature control data processing unit. The intelligent temperature control data processing unit determines that the temperature rising in the carburizing quenching box 12 is completed according to the trigger signal, technical data and distance data, and determines the temperature rising uniformity in the carburizing quenching box 12 according to the temperature difference data. When it is determined that the temperature has reached the carburizing temperature and the uniformity meets the requirements, the intelligent temperature control data processing unit The temperature control data processing unit can send a temperature control instruction to the intelligent temperature control unit to maintain the temperature, and at the same time send a carburizing instruction to the carburizing control unit, so that the carburizing control unit controls the carburizing structure to perform carburizing treatment on the medical metal parts. At this time, the temperature-sensitive deformation strip 33 in the balanced temperature-sensitive strip 31 maintains an expanded deformation effect, so that the two distance sensing contacts 4 maintain abutment effect, causing the distance sensing sheet 41 to transmit stable distance data to the distance acquisition unit, and the distance difference unit inputs the temperature difference balance data to the intelligent temperature control data processing unit through the calculation of the distance difference. Therefore, the temperature data in the carburizing quenching box 12 at this time meets the carburizing requirements;

[0073] During the carburizing process, if the two temperature sensing chambers 32 in the same balanced temperature sensing strip 31 have inconsistent volume expansion, the two distance sensing sheets 41 will transmit distance data of different values ​​to the distance acquisition unit. The distance acquisition unit will transmit the distance data to the intelligent temperature control data processing unit and the distance difference unit respectively. The distance difference unit will judge the temperature difference data at this time based on the distance difference data. The intelligent temperature control data processing unit will judge that the carburizing quenching box 12 is in a temperature uneven state based on the temperature difference data and the distance data. Then the intelligent temperature control data processing unit will judge the data received from the temperature rise trigger unit. If the temperature rise trigger unit continues to send a trigger signal to the intelligent temperature control data processing unit at this time, it will be judged that the carburizing temperature in the carburizing quenching box 12 is uneven and exceeds the upper limit value. It is necessary to transmit cooling and uniform temperature control adjustment instructions to the intelligent temperature control unit so that the intelligent temperature control unit can reduce the temperature. The power of the electric heating structure at a high position is used to ensure temperature uniformity and balance, avoid excessive temperature fluctuations, or increase in carburizing concentration caused by excessive carburizing temperature. If the temperature increase trigger unit no longer sends a trigger signal to the intelligent temperature control data processing unit at this time, it is judged that the carburizing temperature in the carburizing quenching box 12 is uneven and exceeds the lower limit value, and it is necessary to transmit a temperature increase and uniformity temperature control adjustment instruction to the intelligent temperature control unit, so that the intelligent temperature control unit controls to increase the power of the electric heating structure at a lower temperature position to ensure temperature uniformity and balance, avoid excessive temperature fluctuations, or decrease in carburizing concentration caused by excessive carburizing temperature, and then the uniformity and balance of the carburizing temperature can be ensured by dynamically balancing the carburizing temperature, thereby improving the carburizing quality and uniformity of medical metal parts, thereby improving the heat treatment quality of medical metal parts, improving the yield rate, and promoting the economic benefits of their heat treatment;

[0074] In the process of dynamic balance regulation of the carburizing temperature in the carburizing quenching box 12 by the intelligent temperature control data processing unit, the triggering column 5 and the linkage column 51 located in the same temperature-sensitive deformation strip 33 come into contact with each other, triggering the imbalance triggering unit. The imbalance triggering unit transmits the imbalance data to the intelligent temperature control data processing unit. The intelligent temperature control data processing unit determines the validity of the imbalance data at this time according to the timing data transmitted by the temperature rising timing unit, the distance data transmitted by the distance acquisition unit, and the temperature difference data transmitted by the distance difference unit, and then determines whether the carburizing quenching box 12 is in high temperature imbalance or low temperature imbalance through the signal data of whether the distance sensing contact block 4 transmitted by the temperature rising triggering unit is triggered, and then Based on the temperature difference data and the imbalance data, a temperature control and regulation instruction is issued to the intelligent temperature control unit. While the intelligent temperature control unit controls the temperature control of the electric heating structure, the intelligent temperature control data processing unit also transmits abnormal data to the abnormal alarm unit, so that the abnormal alarm unit activates the alarm to remind the staff that the temperature control in the carburizing and quenching box 12 is abnormal at this time. Then the staff inspects and maintains the heat treatment equipment 1, and controls the change of temperature data in the carburizing and quenching box 12 according to the intelligent temperature control unit, judges the effectiveness of the temperature control improvement under the abnormal state, and then takes remedial measures in time to avoid damage to medical metal parts and damage to the heat treatment equipment 1 caused by continuous temperature imbalance, thereby ensuring safety during the heat treatment process.

[0075] During the process of carburizing medical metal parts by heat treatment equipment 1, the intelligent temperature control data processing unit will also transmit the full data of its temperature control process to the temperature control data output unit, so that the temperature control data output unit transmits the full temperature control data to the PC connected to it through the data interface, so that the staff can continuously improve the heat treatment process through the analysis of the full temperature control data, while ensuring the heat treatment efficiency of medical metal parts by heat treatment equipment 1, promote its heat treatment quality, improve the yield rate, and promote the economic benefits of heat treatment of medical metal parts.

[0076] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A heat treatment process for improving the hardness of medical metal parts, characterized in that: The heat treatment process design comprises a heat treatment device (1), a heat treatment controller (11) arranged on the heat treatment device (1), a carburizing and quenching box (12) and a movable bottom plate (2), a heat treatment intelligent temperature control system mounted in the heat treatment controller (11), and a balanced temperature sensing component (3) respectively installed on the front and rear inner walls of the carburizing and quenching box (12) and cooperating with the heat treatment intelligent temperature control system, wherein the balanced temperature sensing component (3) is located on a side close to the movable bottom plate (2); The specific steps include: S1. Pretreatment: pretreatment of the parts to be processed; S2. Carburizing, carburizing the pretreated parts; S21. The pretreated parts are placed on the movable bottom plate (2), and then the heat treatment equipment (1) drives the movable bottom plate (2) to be transferred to the lower end of the carburizing and quenching box (12); S22. The heat treatment intelligent temperature control system controls the carburizing quenching box (12) to start the heating effect; S23. The balanced temperature sensing component (3) collects the temperature rise data in the carburizing and quenching box (12), and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently controls the temperature rise rate of the carburizing and quenching box (12) according to the received temperature rise data; S24. After the temperature in the carburizing quenching box (12) rises to 900°C to 950°C, a carburizing treatment is performed so that carbon atoms penetrate into the surface layer of the pretreated part; S25. The temperature-balanced sensing component (3) collects the temperature maintenance data in the carburizing and quenching box (12), and then transmits it to the heat treatment intelligent temperature control system. The heat treatment intelligent temperature control system intelligently controls the temperature balance of the carburizing and quenching box (12) according to the received temperature maintenance data; S3. Quenching, rapid cooling of carburized parts; S4. Low temperature tempering, low temperature tempering of the quenched parts between 150°C and 250°C; S5. Post-processing: post-processing the low temperature tempered parts to make them meet the precise size and surface requirements; S6. Inspection: quality inspection of the parts after post-processing; The balanced temperature sensing component (3) comprises a balanced temperature sensing strip (31) embedded in the inner wall of the carburizing and quenching box (12), a temperature sensing cavity (32) is provided in the balanced temperature sensing strip (31), both left and right inner walls of the temperature sensing cavity (32) are fixedly connected with temperature sensing deformation strips (33), the two ends of the two temperature sensing deformation strips (33) close to each other are fixedly connected with a distance sensing contact block (4), the temperature sensing deformation strips (33) are filled with thermal expansion fillers (34), and the inner wall of the temperature sensing deformation strip (33) away from the distance sensing contact block (4) is fixedly connected with a distance sensing sheet (41) matching with the distance sensing contact block (4); The heat treatment intelligent temperature control system includes an intelligent temperature control data processing unit, the input end of the intelligent temperature control data processing unit is connected to a temperature rise timing unit, a distance acquisition unit and a distance difference unit, and the output end of the intelligent temperature control data processing unit is connected to an intelligent temperature control unit and a carburizing control unit; The input end of the temperature rise timing unit is connected to the timer signal arranged in the heat treatment equipment (1), the input end of the distance acquisition unit is connected to the distance sensing sheet (41) signal, the input end of the distance difference unit is connected to the distance acquisition unit signal, the input end of the intelligent temperature control unit is connected to the electric heating structure signal arranged in the carburizing quenching box (12), and the input end of the carburizing control unit is connected to the carburizing structure signal installed at the rear end of the heat treatment equipment (1).

2. A heat treatment process for improving the hardness of medical metal parts according to claim 1, characterized in that: The input end of the intelligent temperature control data processing unit is also connected to a temperature rise trigger unit, and the input end of the temperature rise trigger unit is connected to a distance sensing contact block (4) signal.

3. The heat treatment process for improving the hardness of medical metal parts according to claim 1, characterized in that: The inner wall of the temperature-sensitive deformation strip (33) on the side away from the distance sensing contact block (4) is fixedly connected to a triggering support column (5), the inner wall of the temperature-sensitive deformation strip (33) on the side close to the distance sensing contact block (4) is fixedly connected to a linkage support column (51), and an auxiliary elastic member (52) sleeved between the triggering support column (5) and the linkage support column (51) is fixedly connected between the left and right inner walls of the temperature-sensitive deformation strip (33).

4. A heat treatment process for improving the hardness of medical metal parts according to claim 3, characterized in that: The input end of the intelligent temperature control data processing unit is also connected to an imbalance trigger unit, and the input end of the imbalance trigger unit is connected to a trigger column (5) signal.

5. The heat treatment process for improving the hardness of medical metal parts according to claim 1, characterized in that: The output end of the intelligent temperature control data processing unit is also connected to a filler content control unit, the output end of the filler content control unit is connected to a filler pump signal arranged at the rear end of the heat treatment equipment (1), the output end of the filler pump is connected to the temperature-sensitive deformation strip (33) through a high-temperature resistant pipeline, and the input end of the filler pump is connected to a filler storage signal arranged at the rear end of the heat treatment equipment (1).

6. The heat treatment process for improving the hardness of medical metal parts according to claim 1, characterized in that: The output end of the intelligent temperature control data processing unit is also connected to an abnormal alarm unit and a temperature control data output unit, the output end of the abnormal alarm unit is connected to an alarm signal provided on the heat treatment equipment (1), and the output end of the temperature control data output unit is connected to a data interface signal provided on the heat treatment controller (11).

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