Silver brazing temperature control device for PDC (polycrystalline diamond compact) drill bit

Abstract

The invention discloses a silver brazing temperature control device for a PDC (Polycrystalline Diamond Compact) drill bit. The silver brazing temperature control device comprises a base plate, a lower frame, a sliding table component, a driving component, an indexing head component, a superaudio frequency induction heating system, a closed-loop temperature control system and a foot switch. The sliding table assembly achieves X-axis position adjustment, Y-axis position adjustment and Z-axis position adjustment, the indexing head assembly achieves rotation and inclination angle adjustment through the chuck assembly and the inclination angle mechanism, and multi-axis positioning is formed. The ultrasonic frequency induction heating system adopts a profiling red copper pipe induction coil to locally heat the PDC composite sheet. The closed-loop temperature control system controls the welding temperature to be 690-700 DEG C, the temperature control precision to be + / -5 DEG C and the response time to be smaller than or equal to 10 ms in real time through an infrared thermometer, a signal system transmitting box and a single chip microcomputer, multi-point temperature measurement is supported, and heating is controlled to be started and stopped through a foot switch. A closed-loop temperature control system and superaudio frequency induction heating are combined, local real-time heating of the PDC is achieved, the welding temperature is accurately controlled, the welding quality and efficiency are improved, and the method is suitable for the complex geometry and impact resistance requirements of a coal mine PDC drill bit.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine drill production, and relates to a temperature control device for silver brazing of PDC composite bit. Background Art

[0002] Polycrystalline Diamond Compact (PDC) bits are widely used in coal mines, geological exploration, oil and gas extraction and other fields due to their high hardness, wear resistance and excellent cutting performance. In the manufacturing process of PDC bits, silver brazing technology is the key process for connecting PDC composite bits and bit matrixes, and its welding quality directly affects the performance and service life of the bits. Silver brazing requires precise temperature range (usually 690°C to 700°C) to ensure that the filler metal melts fully and forms a strong metallurgical bond, while avoiding thermal damage to the composite bit or deterioration of the matrix material properties caused by excessive temperature. However, due to the thermal sensitivity of PDC composite bits and the complexity of bit structures, traditional brazing processes face many challenges in temperature control, positioning accuracy and automation level.

[0003] Currently, silver brazing of PDC composite bits mainly adopts manual oxyacetylene gas welding process, and the welding is completed by heating the composite bit and the matrix with the gas welding flame. However, this process has several deficiencies. First, the temperature of the gas welding flame is difficult to control precisely. Operators judge the heating temperature only by observing the flame color with the naked eye, and it is impossible to accurately master the ideal range of 690°C to 700°C, which is very easy to exceed 720°C, resulting in graphitization of the working part of the composite bit, losing cutting and wear resistance, and causing rejects. Second, manual gas welding completely depends on the experience and skills of operators. Workers need to continuously operate the welding torch manually, with high labor intensity, and the preheating time of the bit body is long, which is easy to cause matrix cracking due to uneven heating, and the processing efficiency is low. Third, it is difficult to ensure the welding quality of the composite bit with manual flame heating, with large temperature fluctuations, poor welding consistency and high reject rate. In addition, there are many types of large-diameter drill tools. Manual gas welding is inconvenient to operate when dealing with bits of different specifications, and there are certain safety hazards in flame operation, such as the risk of gas leakage or high-temperature burns. Finally, during drilling in complex alternating strata and hard rock strata, PDC composite bits often have problems such as tooth loss, chip breakage and premature wear of the outer circle of the bit body, resulting in a significant reduction in the bit life. Research shows that selecting a suitable silver brazing heating process technology can significantly improve the bonding strength of the composite bit and the durability of the bit, but manual gas welding is difficult to meet this requirement.

[0004] In some improved existing technologies, induction heating equipment combined with an infrared thermometer is used for PDC bit brazing, and a fuzzy control system is adopted in part of the process to achieve closed-loop temperature regulation. The fuzzy control system processes the temperature deviation through fuzzy algorithms and empirical rules to generate control instructions for adjusting the heating power. However, fuzzy control has obvious limitations. Its temperature control accuracy is usually not clearly quantified, and there may be fluctuations of ±10°C or more, making it difficult to stably control within the range of 690°C to 700°C. In addition, the fuzzy algorithm requires defining complex fuzzy sets and rule bases, with a long processing time and a slow response speed (possibly exceeding 10 milliseconds), which is not conducive to rapid temperature regulation. Moreover, existing induction heating mostly adopts an intermediate-frequency overall heating scheme, where the entire bit body and composite inserts are heated integrally by a heating furnace. The in-furnace heating method is difficult to accurately control the local welding temperature, and it is also difficult to control the temperature fluctuation during the welding process, while having a high energy consumption.

[0005] For the special requirements of coal mine PDC bits, the deficiencies of traditional processes are particularly prominent. Coal mine bits need to have higher impact resistance and more complex geometric structures to adapt to complex alternating strata and hard rock strata, while manual gas welding and fuzzy control systems are difficult to meet these requirements. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to solve the above problems and provide a temperature control device for silver brazing of PDC composite insert bits, which can effectively avoid thermal damage to PDC composite inserts caused by temperature fluctuations.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A temperature control device for silver brazing of PDC composite insert bits includes a base plate, a lower frame, a slide table assembly, a drive assembly, a dividing head component, a super audio frequency induction heating system, a closed-loop temperature control system, and a foot switch;

[0009] Among them, the base plate is fixed on the lower frame to form the support foundation of the device;

[0010] The dividing head component is arranged on the slide table assembly. The slide table assembly is installed on the base plate and is connected to the drive assembly. Driven by the drive assembly, the X, Y, and Z axis position adjustment of the dividing head component is realized;

[0011] The dividing head component includes a chuck assembly and an inclination mechanism. The chuck assembly is used for clamping and fixing the PDC composite insert bit; the chuck assembly is rotatably arranged on the inclination mechanism, and the inclination mechanism is connected to the slide table assembly. By rotating the chuck assembly and adjusting the inclination mechanism, the rotation angle and inclination angle adjustment of the PDC composite insert bit are realized;

[0012] The positioning and rotation of the PDC composite bit in three-dimensional space are realized through the sliding table assembly and the dividing head component;

[0013] The ultra-audio-frequency induction heating system includes an ultra-audio-frequency induction heating device and an induction coil aligned with the PDC composite, which is used for locally inductively heating the PDC composite;

[0014] The closed-loop temperature control system includes an infrared thermometer, a signal system transmitter box, a temperature control display box, and a single-chip microcomputer control system. The infrared thermometer is installed on an adjustable bracket and is used to detect the welding temperature on the surface of the PDC composite in real time and convert the temperature signal into an electrical signal. The signal system transmitter box receives the electrical signal and transmits it to the temperature control display box. The temperature control display box compares the temperature value corresponding to the electrical signal with the preset temperature range through the single-chip microcomputer control system. When the temperature is lower than 690°C, the output voltage of the ultra-audio-frequency induction heating system is increased. When the temperature reaches 700°C, the output voltage is decreased to form a closed-loop temperature regulation loop; the temperature control accuracy of the closed-loop temperature control system is ±5°C, and the system response time ≤ 10 milliseconds;

[0015] The foot switch is electrically connected to the ultra-audio-frequency induction heating system and is used to control the start and stop of the welding heating.

[0016] Furthermore, the inclination mechanism includes two fixing plates hinged at one end through a hinge. The chuck assembly is provided on one of the fixing plates, and the other fixing plate is fixed on the sliding table assembly; the other ends of the two fixing plates are rotatably connected with a long sliding table lead screw to form a triangular support structure. The included angle between the two fixing plates is adjusted through the long sliding table lead screw, thereby changing the inclination angle of the chuck assembly.

[0017] Furthermore, the sliding table assembly includes a sliding table for installing the dividing head component and three guide rails respectively located in the X, Y, and Z-axis directions. The three guide rails are driven by a lead screw mechanism to realize the X, Y, and Z-axis movement of the sliding table.

[0018] Furthermore, the sliding table includes an upper support plate and a lower support plate; the inclination mechanism is fixedly arranged on the upper support plate. The upper support plate and the lower support plate are slidably matched through a Y-direction guide rail. The lower support plate is slidably arranged on the lower sliding table through an X-direction guide rail; a vertical column seat is provided on the base plate, and the lower sliding table is slidably matched with the column seat through a Z-direction guide rail.

[0019] Furthermore, the temperature control display box includes a display and an intelligent measurement and control instrument. The display is used to display the welding temperature of the PDC composite in real time, and the intelligent measurement and control instrument is used to set the upper temperature limit value and generate a control signal to the single-chip microcomputer control system.

[0020] Furthermore, there are one or more infrared thermometers for detecting the surface temperature of a single or multiple PDC composite sheets, and the angle and height can be adjusted in the horizontal and vertical directions through the adjustable bracket.

[0021] Furthermore, the signal system transmitting box includes a signal receiving circuit and a transmission circuit, the signal receiving circuit is used to receive the electrical signal of the infrared thermometer, and the transmission circuit is used to transmit the electrical signal to the temperature control display box.

[0022] Furthermore, the ultrasonic induction heating system adopts GP60E ultrasonic induction heating equipment, which supports closed-loop temperature control in the range of 400°C to 1200°C.

[0023] Furthermore, the induction coil is made of a copper tube, and its shape and structure are designed in a contoured manner according to the geometric characteristics of the PDC composite sheet, maintaining a spacing of 10 to 15 mm from the PDC composite sheet to ensure that the heating part is parallel or equidistant to the cutting sheet groove, and the current flows in the adjacent turns of the induction coil in the same direction.

[0024] Furthermore, the driving assembly includes a speed regulating motor and a pulley. The speed regulating motor is connected to the slide assembly through the pulley and the belt to drive the slide assembly to adjust the position of the X, Y and Z axes.

[0025] The beneficial effects of the present invention are:

[0026] The present invention combines a closed-loop temperature control system with supersonic induction heating to achieve local real-time heating of the PDC composite sheet, accurately control the welding temperature, and ensure welding quality. The specific advantages are as follows:

[0027] 1. High-precision temperature control to prevent graphitization of composite sheets

[0028] The present invention adopts a closed-loop temperature control system, uses an infrared thermometer to detect the surface temperature of the PDC composite sheet in real time, and converts the temperature signal into an electrical signal, which is transmitted to the temperature control display box through the signal system transmitter box. The single-chip control system is based on a direct comparison algorithm, and compares the temperature value with the preset range (690°C to 700°C) in real time. When the temperature is lower than 690°C, the output voltage of the supersonic induction heating system is increased, and when the temperature reaches 700°C, the output voltage is reduced, achieving a temperature control accuracy of ±5°C and a fast response of ≤10 milliseconds. It can effectively avoid the graphitization of the working part of the composite sheet caused by temperature fluctuations, ensure the cutting and wear resistance of polycrystalline diamond, and reduce the scrap rate.

[0029] 2. Multi-point temperature measurement to adapt to complex drill bit structure

[0030] The closed-loop temperature control system supports one or more infrared thermometers, which can detect the surface temperature of single or multiple PDC compacts simultaneously, and can adjust the angle and height in the horizontal and vertical directions through an adjustable bracket to meet the multi-point temperature measurement requirements of complex drill bit structures. It can monitor the temperature distribution of multiple welding points in real time, ensure uniform heating of each compact, improve the consistency of welding quality, and is especially suitable for the complex geometric structure of coal mine PDC drill bits.

[0031] 3. Local heating to improve uniformity and energy efficiency

[0032] The present invention adopts a superaudio induction heating system, equipped with a GP60E superaudio induction heating device and a profiled copper tube induction coil. The induction coil is designed according to the geometric characteristics of the PDC compact, maintaining a distance of 10 - 15 mm from the compact, ensuring that the heating part is parallel or equidistant from the cutting insert groove, and the current flow direction between adjacent turns is the same, realizing precise local heating. Compared with medium-frequency overall heating (heating the entire drill bit body through a heating furnace, with uneven temperature distribution, prone to causing overheating of the compact and thermal stress in the matrix), the local heating solution of the present invention focuses on heating the welding area, avoiding heating of non-welding parts of the matrix, significantly improving the heating uniformity, reducing the energy consumption and the risk of thermal damage, and enhancing the bonding strength of the compact.

[0033] 4. Multi-axis positioning to meet complex positioning requirements

[0034] Through the slide table assembly and the dividing head component, the present invention realizes the multi-axis positioning function of the PDC compact drill bit. The slide table assembly supports the adjustment of the X, Y, and Z axis positions, equipped with X, Y, and Z direction guide rails and lead screw mechanisms to ensure the precise movement of the drill bit in three-dimensional space. The dividing head component includes a chuck assembly and an inclination mechanism. The chuck assembly realizes the adjustment of the rotation angle of the drill bit, and the inclination mechanism forms a triangular support structure through hinges and long slide table lead screws to adjust the included angle of the fixed plate to change the inclination angle. The multi-axis positioning system of the present invention can flexibly adapt to the complex geometric structure of coal mine PDC drill bits, reduce manual adjustment, and improve the positioning accuracy and operation efficiency.

[0035] 5. Safety and stability

[0036] The present invention adopts superaudio induction heating and closed-loop temperature control, replacing the open-flame operation of manual gas welding, eliminating safety hazards such as gas leakage and high-temperature burns. The profiled induction coil and multi-point temperature measurement ensure the stability of the heating process, reducing the risk of matrix cracking caused by uneven temperature. Compared with manual gas welding (with high safety hazards) and medium-frequency overall heating (with thermal stress risks) in the background technology, the present invention improves the safety of the welding process and the stability of equipment operation.

[0037] Other advantages, objects, and features of the present invention will be set forth in part in the following description, and in part will be obvious to those skilled in the art upon examination of the following, or may be learned from the practice of the present invention. The objects and other advantages of the present invention may be realized and obtained by the following description of the specification. Brief Description of the Drawings

[0038] In order to make the objects, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings. Among them:

[0039] Figure 1 It is the rear view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0040] Figure 2 It is the right view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0041] Figure 3 It is the front view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0042] Figure 4 It is the top view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0043] Figure 5 It is the left view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0044] Figure 6 It is the axonometric view of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0045] Figure 7 It is the schematic diagram of the closed-loop heating principle of the silver brazing temperature control device for the PDC composite bit in the present invention.

[0046] Reference numerals: 1 - lead screw stopper; 2 - first slide rail; 3 - speed regulating motor; 4 - bearing cover; 5 - bearing block; 6 - first slider; 7 - slide table lead screw; 8 - second slide rail; 9 - adjusting pad; 10 - button box; 11 - temperature control display box; 12 - second slider; 13 - first guide bar; 14 - motor mounting plate; 15 - column base; 16 - connecting seat; 17 - lead screw seat; 18 - slide table lead screw; 19 - rib plate; 20 - hinge; 21 - upper support plate; 22 - lower support plate; 23 - proximity switch; 24 - first button; 25 - second button; 26 - 8M pulley; 27 - long slide table lead screw; 28 - display; 29 - T-shaped lead screw and T-shaped nut block; 30 - top plate; 31 - induction block; 32 - inner spacer ring; 33 - outer spacer ring; 34 - emergency stop button; 35 - button plate; 36 - speed regulator; 37 - 20 lead screw nut; 38 - 20 lead screw nut block; 39 - signal system transmitter box; 40 - lower slide table; 41 - second guide bar; 42 - third slider; 43 - 20 ball screw; 44 - infrared thermometer; 45 - dividing head component; 46 - fourth slider; 47 - angle iron; 48 - guide bar; 49 - base plate; 50 - lower frame; 51 - foot cup; 52 - foot switch; 53 - first connecting plate; 55 - second connecting plate; 56 - 5M pulley; 57 - fifth slider; 58 - 5M pulley; 59 - sixth slider; 60 - motor base; 61 - 8M pulley; 62 - speed regulating motor; 63 - rear cover; 64 - seventh slider; 65 - eighth slider 65; 66 - temperature control box; 68 - adjustable bracket; 69 - PDC composite bit; 70 - PDC composite sheet; 71 - induction coil; 72 - T-slot support plate; 73 - table top panel. Detailed implementation manners

[0047] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0048] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as limitations on the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0049] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0050] Please refer to Figures 1 to 7 , which is a temperature control device for silver brazing of PDC composite bit, including a base plate 49, a lower frame 50, a slide table assembly, a driving assembly, a dividing head component 45, a super audio frequency induction heating system, a closed-loop temperature control system and a foot switch 52.

[0051] Among them, the base plate 49 is fixed on the lower frame 50 to form the support foundation of the device; a foot cup 51 is installed at the bottom of the lower frame 50 for adjusting the horizontal stability of the device.

[0052] The dividing head component 45 is arranged on the slide table assembly. The slide table assembly is installed above the base plate 49 and is connected to the driving assembly. Driven by the driving assembly, the X, Y, and Z axis position adjustments of the dividing head component 45 are realized; the dividing head component includes a chuck assembly and an inclination mechanism. The chuck assembly is used for clamping and fixing the PDC composite bit 69; the chuck assembly is rotatably arranged on the inclination mechanism, and the inclination mechanism is connected to the slide table assembly. By rotating the chuck assembly and adjusting the inclination mechanism, the rotation angle and inclination angle of the PDC composite bit are adjusted; the positioning and rotation of the PDC composite bit in three-dimensional space are realized through the slide table assembly and the dividing head component;

[0053] The super audio frequency induction heating system includes a super audio frequency induction heating device and an induction coil 71 corresponding to the PDC composite sheet 70, and is used for locally inductively heating the PDC composite sheet 70;

[0054] The closed-loop temperature control system includes an infrared thermometer 44, a signal system transmitter box 39, a temperature control display box 11, and a single-chip microcomputer control system. The infrared thermometer 44 is installed on an adjustable bracket 68, and the adjustable bracket 68 is installed on one side of the column base 15, which is used to detect the welding temperature on the surface of the PDC composite sheet in real time and convert the temperature signal into an electrical signal. The signal system transmitter box receives the electrical signal and transmits it to the temperature control display box 11. The temperature control display box 11 compares the temperature value corresponding to the electrical signal with the preset temperature range through the single-chip microcomputer control system. When the temperature is lower than 690 °C, the output voltage of the ultra-audio frequency induction heating system is increased, and when the temperature reaches 700 °C, the output voltage is decreased to form a closed-loop temperature regulation loop. The temperature control accuracy of the closed-loop temperature control system is ±5 °C, and the system response time ≤ 10 milliseconds;

[0055] The foot switch 52 is electrically connected to the ultra-audio frequency induction heating system and is used to control the start and stop of the welding heating.

[0056] Among them, the inclination mechanism includes two fixed plates hinged at one end through a hinge 20. A chuck assembly is arranged on one of the fixed plates, and the chuck assembly is driven by a slide screw 18 to achieve angular rotation. The other fixed plate is fixed on the slide table assembly. The other ends of the two fixed plates are rotatably connected with a long slide screw 27 to form a triangular support structure. The included angle between the two fixed plates is adjusted by the long slide screw 27, thereby changing the inclination angle of the chuck assembly.

[0057] Among them, the slide table assembly includes a slide table for installing the dividing head component and three guide rails in the X, Y, and Z axis directions respectively. The three guide rails are driven by a screw mechanism to achieve the movement of the slide table in the X, Y, and Z axes. The slide table includes an upper support plate 21 and a lower support plate 22. The inclination mechanism is fixedly installed on the T-shaped groove support plate 72 on the upper support plate 21. The upper support plate 21 and the lower support plate 22 are slidably matched through a Y-direction guide rail. The Y-direction guide rail is driven by a slide screw 7. The lower support plate 22 is installed on the table panel 73, and the table panel 73 is slidably arranged on the lower slide table 40 through an X-direction guide rail. A vertical column base 15 is arranged on the base plate, and a Z-direction guide rail is installed on the column base. The two sides of the lower slide table are respectively slidably connected to the Z-direction guide rail through a first connecting plate and a second connecting plate.

[0058] The X-direction guide rail includes two parallel guide rails 48, which are respectively composed of a first slide rail 2, a second slide rail 8, a first slider 6, a second slider 12, a third slider 42, and a fourth slider 46. The first slider 6, the second slider 12, the third slider 42, and the fourth slider 46 are respectively installed at the four corners of the bottom of the lower support plate 22, and slide with the first slide rail 2 and the second slide rail 8. The screw mechanism driving the X-direction guide rail includes 20 ball screws 43, 20 screw nut seats 38, 20 screw nuts 37, a speed regulating motor 3, a bearing cover 4, a bearing seat 5, a 5M pulley 56, a 5M pulley 58, and a screw stopper 1; the bearing seat 5 is located at the first The guide rail 2 is between the guide rail 2 and the second guide rail 8, and is fixed on the lower slide; the guide screw nut seat 38 is fixedly mounted on the lower support plate 22, and the guide screw nut 37 is mounted in the guide screw nut seat 38 and is sleeved on the guide screw 43; the guide screw 43 is rotatably mounted on the bearing seat 5 and sealed by the bearing cover 4, and the inner spacer 32 and the outer spacer 33 are installed on the bearing cover 4; the end of the guide screw 43 is connected to the belt and the speed regulating motor 3 through the 5M pulley 56 and the 5M pulley 58, and the speed regulating motor 3 is fixedly mounted on the side of the lower slide 40 through the motor mounting plate 14, and the movement of the X-direction guide rail is realized by the speed regulating motor 3. An angle iron 47 is installed on the side of the lower support plate 22, and the angle iron 47 is installed with a sensing block 31 through an adjusting pad 9, and a proximity switch 23 is installed on the side of the lower slide 40, and the movement limit limit in the X direction is realized by the proximity switch 23 and the sensing block 31.

[0059] The Z guide rail includes a first guide rail 13 and a second guide rail 41 installed in parallel on both sides of the column seat. The two sides of the slide 40 are connected to the first connecting plate 53 and the second connecting plate 55 respectively. The first connecting plate 53 and the second connecting plate 55 are respectively installed with a fifth slider 57, a sixth slider 59, a seventh slider 64, and an eighth slider 65. The fifth slider 57, the sixth slider 59, the seventh slider 64, and the eighth slider 65 are slidably matched with the first guide rail 13 and the second guide rail 41; the Z guide rail drives Z The screw mechanism of the guide rail is driven by a speed regulating motor 62 and an 8M pulley 61. The speed regulating motor 62 is fixedly mounted on the top plate 30 of the column seat 15 through a motor seat 60. One end of the T-type screw and T-type nut seat 29 is mounted on the connecting seat 16 through a screw seat 17, and the other end is connected to the lower slide 40 through a rib plate 19. The speed regulating motor 62 cooperates with the belt through the 8M pulley 26 and the 8M pulley 61 to connect the T-type screw and the T-nut seat 29, thereby driving the screw mechanism, thereby realizing movement in the Z direction.

[0060] The top 30 and the back cover 63 form an electrical cabinet beside the column seat 15. A temperature control box 66 is installed on the top of the electrical cabinet, and a signal system transmitting box 39 is installed on the side. A button box 10 is installed on the side of the lower slide 40. A button board 35 is installed in the button box 10. The button board is equipped with a first button 24, a second button 25, a speed regulator 36, and an emergency stop button 34.

[0061] Among them, the temperature control display box 11 includes a display 28 and an intelligent measurement and control instrument. The display 28 is used to display the welding temperature of the PDC composite sheet in real time, and the intelligent measurement and control instrument is used to set the upper limit value of the temperature and generate a control signal to the single-chip microcomputer control system.

[0062] Among them, there is one or more infrared thermometers 44, which are used to detect the surface temperature of single or multiple PDC composite sheets, and the angle and height can be adjusted in the horizontal and vertical directions through an adjustable bracket.

[0063] Among them, the signal system transmitting box includes a signal receiving circuit and a transmission circuit. The signal receiving circuit is used to receive the electrical signal of the infrared thermometer, and the transmission circuit is used to transmit the electrical signal to the temperature control display box 11.

[0064] Among them, the ultra-audio frequency induction heating system uses a GP60E ultra-audio frequency induction heating device, which supports closed-loop temperature control in the range of 400°C to 1200°C.

[0065] Among them, the induction coil 71 is made of copper tubing, and its shape and structure are designed according to the geometric characteristics of the PDC composite sheet 70, maintaining a distance of 10-15 mm from the PDC composite sheet to ensure that the heating part is parallel or equidistant from the cutting blade groove, and the current flow direction between adjacent turns of the induction coil is the same.

[0066] Among them, the drive assembly includes multiple speed-regulating motors and belt pulleys. The speed-regulating motors are speed-controlled through a speed regulator and are driven by the belt pulleys through a belt to drive the slide table assembly to adjust the positions of the X, Y, and Z axes.

[0067] The foot switch 52 is electrically connected to the ultra-audio frequency induction heating system. The operator controls the start and stop of heating by stepping on the foot, and the switch response time ≤ 50 ms.

[0068] The operation process is as follows:

[0069] (1) Fix the PDC composite sheet drill bit on the chuck assembly, adjust the inclination mechanism and the rotation angle of the chuck, and set the initial welding position.

[0070] (2) Adjust the slide table assembly through the drive assembly to align the PDC composite sheet with the induction coil and control the distance to 10 mm.

[0071] (3) Set the temperature range of 690°C - 700°C in the temperature control display box 11, start the foot switch, and the GP60E device starts local heating.

[0072] (4) The infrared thermometer detects the temperature of the composite sheet in real time. The signal is transmitted to the temperature control display box 11 through the transmitting box, and the single-chip microcomputer adjusts the output voltage according to the temperature feedback to keep the temperature stable.

[0073] After welding is completed, turn off the foot switch, remove the drill bit, complete the single-piece welding, and repeat the steps to process multiple composite pieces.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not 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 present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A PDC composite drill bit silver brazing temperature control device, characterized in that: It includes a base plate, a lower frame, a slide assembly, a drive assembly, a dividing head component, a super-frequency induction heating system, a closed-loop temperature control system and a foot switch; Wherein, the base plate is fixed on the lower frame to form the supporting foundation of the device; The indexing head component is arranged on the slide assembly, the slide assembly is mounted on the base plate and connected to the driving assembly, and driven by the driving assembly, the X, Y, and Z three-axis position adjustment of the indexing head component is realized; The indexing head component includes a chuck assembly and an inclination mechanism, wherein the chuck assembly is used to clamp and fix the PDC composite drill bit; the chuck assembly is rotatably arranged on the inclination mechanism, and the inclination mechanism is connected to the slide assembly, and the rotation angle and inclination angle of the PDC composite drill bit can be adjusted by rotating the chuck assembly and adjusting the inclination mechanism; The positioning and rotation of the PDC composite drill bit in three-dimensional space are achieved through the slide assembly and the indexing head component; The supersonic frequency induction heating system comprises a supersonic frequency induction heating device and an induction coil aligned with the PDC composite sheet, and is used for performing local induction heating on the PDC composite sheet; The closed-loop temperature control system includes an infrared thermometer, a signal system transmitter box, a temperature control display box and a single-chip control system. The infrared thermometer is installed on an adjustable bracket to detect the welding temperature of the surface of the PDC composite sheet in real time and convert the temperature signal into an electrical signal. The signal system transmitter box receives the electrical signal and transmits it to the temperature control display box. The temperature control display box compares the temperature value corresponding to the electrical signal with the preset temperature range through the single-chip control system. When the temperature is lower than 690°C, the output voltage of the super-audio induction heating system is increased, and when the temperature reaches 700°C, the output voltage is reduced to form a closed-loop temperature regulation loop; the closed-loop temperature control system has a temperature control accuracy of ±5°C and a system response time of ≤10 milliseconds; The foot switch is electrically connected to the ultrasonic induction heating system and is used to control the start and stop of welding heating.

2. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The inclination mechanism includes two fixed plates hinged at one end by a hinge, wherein the chuck assembly is provided on one of the fixed plates, and the other fixed plate is fixed on the slide assembly; the other ends of the two fixed plates are rotatably connected to a long slide screw to form a triangular support structure, and the angle between the two fixed plates is adjusted by the long slide screw to change the inclination angle of the chuck assembly.

3. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The slide assembly includes a slide for mounting the dividing head component and three guide rails respectively located in the X, Y and Z axis directions. The three guide rails are driven by a lead screw mechanism to realize the X, Y and Z axis movement of the slide.

4. The PDC composite drill bit silver brazing temperature control device according to claim 3, characterized in that: The slide comprises an upper support plate and a lower support plate; the inclination mechanism is fixedly arranged on the upper support plate, the upper support plate and the lower support plate are slidably matched via a Y guide rail, and the lower support plate is slidably arranged on the lower slide via an X guide rail; a vertically arranged column seat is provided on the base plate, and the lower slide slide is slidably matched with the column seat via a Z guide rail.

5. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The temperature control display box includes a display and an intelligent measurement and control instrument. The display is used to display the welding temperature of the PDC composite sheet in real time. The intelligent measurement and control instrument is used to set the upper temperature limit and generate a control signal to the single-chip control system.

6. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: There are one or more infrared thermometers, which are used to detect the surface temperature of a single or multiple PDC composite sheets, and the angle and height adjustment in the horizontal and vertical directions can be achieved through the adjustable bracket.

7. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The signal system transmitting box includes a signal receiving circuit and a transmission circuit. The signal receiving circuit is used to receive the electrical signal of the infrared thermometer, and the transmission circuit is used to transmit the electrical signal to the temperature control display box.

8. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The supersonic frequency induction heating system adopts GP60E supersonic frequency induction heating equipment, which supports closed-loop temperature control in the range of 400°C to 1200°C.

9. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The induction coil is made of copper tube, and its shape and structure are designed according to the geometric characteristics of PDC composite sheet, maintaining a spacing of 10 to 15 mm with the PDC composite sheet to ensure that the heating part is parallel or equidistant to the cutting sheet groove, and the current flow direction between adjacent turns of the induction coil is consistent.

10. The PDC composite drill bit silver brazing temperature control device according to claim 1, characterized in that: The driving assembly includes a speed regulating motor and a pulley. The speed regulating motor is connected to the slide assembly through the pulley and the belt to drive the slide assembly to adjust the position of the X, Y and Z axes.

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