Hot cutting equipment and method for polytetrafluoroethylene sealing ring

Abstract

The invention discloses hot cutting equipment and method for a polytetrafluoroethylene sealing ring. The hot cutting equipment comprises a rack, a horizontal cutting assembly, an upper cutting assembly and a lower cutting assembly, and the rack is provided with a positioning piece used for positioning the sealing ring to be machined; the horizontal cutting assembly is used for horizontally cutting the opening section of the sealing ring to be machined from outside to inside and cutting the opening section of the sealing ring into a horizontal cutting face, and the horizontal cutting face divides the opening section into an upper part and a lower part. The upper cutting assembly is used for cutting one side of the opening section of the sealing ring to be machined from bottom to top, and the upper cutting assembly stops cutting to the horizontal cutting face; the downward cutting assembly is used for cutting the other side of the opening section of the sealing ring to be machined from top to bottom and stops cutting to the horizontal cutting face. The sealing ring production device has the effect of improving the sealing ring production efficiency.

Description

Technical Field

[0001] The present application relates to the field of sealing ring processing equipment, and in particular to a heat cutting device and method for a polytetrafluoroethylene sealing ring. Background Art

[0002] Polytetrafluoroethylene sealing ring is a plastic product. Compared with rubber, plastic has lower elasticity and higher strength. Plastic can withstand high pressure while rubber cannot. Therefore, in high-pressure dynamic sealing occasions such as automobile air pumps, rubber sealing rings cannot be used as sliding seals, but plastic sealing rings must be used. However, plastic sealing rings have low elasticity, and it is difficult to install a sealing ring without an opening into the groove of the piston. The conventional method is to cut off the annular plastic sealing ring without an opening at one position to form two ends, and then machine matching arm-shaped openings at the two ends of the sealing ring. Finally, the arms are overlapped to form a closed-loop sealing ring. The section where the two arms of the sealing ring overlap is called the opening section of the sealing ring. The shape feature of the arm-shaped opening is that both ends of the sealing ring are reserved with embedded grooves and protruding embedded blocks. The two ends of the disconnected sealing ring are completely closed by overlapping the embedded grooves and the embedded blocks, such as Figure 1 shown.

[0003] In the related art, the processing method of the arm with chip cutting is adopted. The process of processing the arm with chip cutting is complicated. The usual method is to first use a compound turning and milling machine to process one side of the opening, and then turn to the machining center to mill the other side of the opening. The main problem is that the turning and milling method of the arm with chip cutting is slow, and this kind of processing with chip cutting will leave burrs on the arm, and the arm needs to be trimmed, which has low production efficiency. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to improve the production efficiency of polytetrafluoroethylene sealing rings, the present application provides a polytetrafluoroethylene sealing ring hot cutting device and method.

[0005] The present application provides a polytetrafluoroethylene sealing ring heat cutting device and method using the following technical solutions: A hot cutting device for polytetrafluoroethylene sealing rings, comprising: A frame, wherein the frame is provided with a positioning member for positioning the sealing ring to be processed; The horizontal cutting component is used to horizontally cut the opening section of the sealing ring to be processed from the outside to the inside, and cut the opening section of the sealing ring to form a horizontal cutting surface, and the horizontal cutting surface divides the opening section into two parts, an upper part and an lower part; An upper cutting assembly is used to cut one side of the opening section of the sealing ring to be processed from bottom to top, and the upper cutting assembly stops cutting when it reaches a horizontal cutting surface; The lower cutting component is used to cut the other side of the opening section of the sealing ring to be processed from top to bottom, and the lower cutting component stops cutting when it reaches the horizontal cutting surface.

[0006] By adopting the above technical scheme, the positioning parts on the frame ensure that the sealing ring to be processed is stably fixed to avoid displacement during the processing; the flat cutting component horizontally cuts the opening section from the outside to the inside, and accurately divides it into two parts with equal thickness, effectively improving the subsequent processing accuracy; the upper cutting component and the lower cutting component cut the two sides of the opening section from the upper and lower directions respectively. Since the cutting positions of the upper cutting component and the lower cutting component in the opening section of the sealing ring both fall on the horizontal cutting surface formed by the flat cutting component, the cutting positions of the upper cutting component and the lower cutting component can be accurately connected at the horizontal cutting surface formed by the flat cutting component, thereby achieving the purpose of disconnecting the annular sealing ring and forming arm-shaped openings at both ends of the sealing ring. No additional trimming process is required, chip-free processing is realized, and the burr problem caused by traditional turning and milling processing is avoided, which significantly improves production efficiency and product quality.

[0007] Preferably, the positioning member includes a positioning seat and a positioning column arranged in the positioning seat, the outer peripheral surface of the positioning column and the inner wall of the positioning seat form a limiting cavity adapted to the sealing ring, and the positioning seat is provided with an entry opening for the flat cutting component to enter and exit.

[0008] By adopting the above technical solution, the positioning seat and the positioning column cooperate to form a limiting cavity, ensuring the accurate positioning of the sealing ring to be processed during the processing, and avoiding the processing error caused by the offset of the sealing ring position. At the same time, the inlet on the positioning seat provides an inlet and outlet channel for the flat cutting component, ensuring that the flat cutting component can smoothly reach the opening section of the sealing ring for horizontal cutting operation, thereby improving cutting accuracy and work efficiency.

[0009] Preferably, the positioning seat is provided with an air hole located at the bottom of the limiting cavity, and the air hole is connected to an external air source and is used to blow the processed sealing ring out of the limiting cavity.

[0010] By adopting the above technical solution, the sealing ring can be automatically blown out of the limiting cavity by airflow after processing is completed, avoiding the inefficiency and possible product damage caused by manual material removal, and improving the degree of production automation and work efficiency.

[0011] Preferably, the frame includes a vertical plate, a fixed seat arranged at the front of the vertical plate, and a horizontal plate arranged at the back of the vertical plate, the positioning piece is arranged on the upper surface of the fixed seat, the lower cutting component is arranged on the upper part of the vertical plate, the upper cutting component is arranged on the lower part of the vertical plate, and the fixed seat is provided with an upper cutting opening for the upper cutting component to pass upward; the horizontal cutting component is arranged on the back of the vertical plate, and the vertical plate is provided with a horizontal cutting opening for the horizontal cutting component to pass horizontally.

[0012] By adopting the above technical solution, efficient and precise processing of the opening section of the polytetrafluoroethylene sealing ring is achieved. The frame structure is reasonably designed, and the combination of the vertical plate, the fixed seat and the horizontal plate ensures the overall stability of the equipment, while providing a reasonable layout space for each cutting component. The positioning piece is arranged on the upper surface of the fixed seat to facilitate the clamping and positioning of the sealing ring to be processed. The lower cutting component is arranged on the upper part of the vertical plate, and the upper cutting component is arranged on the lower part of the vertical plate, which cooperates with the upper cutting opening on the fixed seat and the flat cutting opening on the vertical plate, so that each cutting action can be carried out in an orderly manner without interfering with each other. This structural arrangement effectively improves the space utilization rate of the equipment, reduces the risk of interference between components, and thus improves the processing efficiency and accuracy.

[0013] Preferably, the lower cutting assembly includes a lower cutting slide plate vertically slidably connected to the frame, a lower cutting knife connected to the lower cutting slide plate, and a lower cutting drive member for driving the lower cutting slide plate to slide up and down. The side of the lower cutting slide plate is provided with an induction assembly, and the frame is provided with a magnetic assembly. The magnetic assembly is located on the travel path of the induction assembly and is used to adjust and control the lower cutting stroke of the lower cutting assembly.

[0014] By adopting the above technical solution, precise control of the down-cutting stroke of the down-cutting component is achieved. Specifically, the vertical sliding connection between the down-cutting slide and the frame cooperates with the down-cutting drive to ensure that the down-cutting knife can stably perform the cutting action; at the same time, the non-contact working principle (such as a magnetic proximity switch or a Hall effect sensor) of the proximity switch mechanism is formed by the induction component (sensor) and the magnetic component (magnet). When the slide moves down and the induction component enters the magnetic field range of the magnet, the sensor triggers a signal and the control system immediately stops the movement of the slide. Through the synergistic effect of the induction component and the magnetic component, the down-cutting stroke can be accurately adjusted within the preset range to avoid the problem of over-cutting or under-cutting, thereby effectively improving the cutting accuracy and product quality. This design significantly improves the working reliability and processing efficiency of the equipment.

[0015] Preferably, a pressure plate located above the positioning member is provided at the bottom of the lower cutting slide, an elastic member is provided between the pressure plate and the lower cutting slide, and the pressure plate is used to press the sealing ring to be processed.

[0016] By adopting the above technical solution, the pressure plate, under the action of the elastic member, presses the sealing ring to be processed, thereby preventing the sealing ring from shifting during the cutting process, thereby improving the cutting accuracy and further improving the processing stability.

[0017] Preferably, both the pressing plate and the positioning column are provided with a lower cutting guide groove along the travel direction of the lower cutting knife.

[0018] By adopting the above technical solution, the lower cutting guide grooves on the pressure plate and the positioning column can provide accurate guidance for the movement of the lower cutter, ensuring that the lower cutter moves along the predetermined trajectory during the cutting process to avoid cutting deviation. At the same time, this structure helps to improve cutting accuracy and reduce the product defect rate caused by tool offset, thereby improving the overall processing quality and efficiency.

[0019] Preferably, a heating component and a heat detection component are provided in the fixing seat, the heating component is used to heat the area contacted by the sealing ring to be processed, and the heat detection component is used to keep the area contacted by the sealing ring to be processed at a constant temperature.

[0020] By adopting the above technical solution, the heating component can heat the area that is in contact with the sealing ring to be processed, making the material easier to cut, reducing the resistance during the cutting process, and improving the quality and flatness of the incision. At the same time, the thermal probe component ensures that the area maintains a constant temperature to avoid deformation or damage of the material due to overheating, thereby ensuring processing accuracy and product quality. Among them, the effect of setting up the heating component is to soften the material to optimize the cutting conditions; the effect of setting up the thermal probe component is to stabilize the temperature control environment to prevent changes in material properties.

[0021] A method for hot cutting a polytetrafluoroethylene sealing ring, using a hot cutting device for a polytetrafluoroethylene sealing ring, comprises the following steps: S1: Calibrate the cutter positions of the upper cutting component, the lower cutting component and the flat cutting component, and then fix the sealing ring to be processed at the positioning piece; S2: Start the flat cutting component, which horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring. The horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts with equal thickness; S3: Start the upper cutting component and the lower cutting component. The upper cutting component cuts one side of the opening section of the sealing ring to be processed from bottom to top. The cutter of the upper cutting component stops after cutting upward to the horizontal cutting surface. The lower cutting component cuts the other side of the opening section of the sealing ring to be processed from top to bottom. The cutter of the lower cutting component stops after cutting downward to the horizontal cutting surface. The sealing ring cutting process is completed.

[0022] By adopting the above technical solution, the processing efficiency and quality of polytetrafluoroethylene sealing rings can be significantly improved. The flat cutting component horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, forming a horizontal cutting surface and dividing the opening section into two parts of equal thickness, ensuring the consistency of subsequent cutting on both sides, improving processing accuracy and reducing material waste. The upper cutting component cuts one side of the opening section from bottom to top, and the lower cutting component cuts the other side of the opening section from top to bottom. The cutting depth of both is half the thickness of the sealing ring, and they are precisely docked at the horizontal cutting surface, avoiding the burr problem caused by traditional chip processing methods. No additional trimming process is required, which effectively improves production efficiency. The entire cutting process is based on the principle of chipless hot cutting, which simplifies the process flow and reduces the complexity of operation. At the same time, it ensures the dimensional accuracy of the arm part, greatly reduces the defective rate, and meets high-quality production needs.

[0023] Preferably, in the tool calibration step of S1, the cutters of the upper cutting component, the lower cutting component and the flat cutting component are calibrated using a tool calibration standard part, and a tool calibration groove compatible with the cutters of the upper cutting component, the lower cutting component and the flat cutting component is provided at the tool calibration position of the tool calibration standard part. During the tool calibration, the tool calibration standard part is fixed at the positioning part, and then the flat cutting component, the upper cutting component and the lower cutting component are started in sequence. When the cutters of the flat cutting component, the upper cutting component and the lower cutting component can pass through the corresponding tool grooves, the tool calibration step is completed.

[0024] By adopting the above technical solution, accurate calibration of the upper cutting component, the lower cutting component and the flat cutting component is achieved. By matching the tool setting groove on the tool setting standard part with the position of each cutter, the accuracy and consistency of the cutter in the subsequent processing process are ensured, and the increase in product defective rate due to cutter position deviation is effectively avoided. At the same time, this method simplifies the tool setting process, improves the efficiency of equipment debugging, and further improves the overall production efficiency and product quality stability. Among them, the introduction of tool setting standard parts for calibration in step S1 significantly enhances the positioning accuracy of the cutter, laying the foundation for subsequent efficient and high-quality hot cutting of sealing rings.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the flat cutting component, the upper cutting component and the lower cutting component, chipless processing is achieved, avoiding the problem of burr residue in traditional turning and milling processing, reducing the subsequent trimming process, and significantly improving production efficiency; 2. The flat cutting component first cuts the opening section of the sealing ring into two parts of equal thickness, and then the upper cutting component and the lower cutting component are accurately cut from both sides to the same horizontal plane, ensuring the high consistency of the arm structure, effectively improving the dimensional accuracy and reducing the defective product rate; 3. The overall design of the equipment is compact and reasonable. The coordinated operation of various components simplifies the processing process, greatly shortens the processing time, and solves the problem of slow speed caused by traditional multi-device switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a sealing ring produced by a chip-forming method in the prior art.

[0027] Figure 2 It is a schematic structural diagram of a sealing ring produced by a hot cutting device of a polytetrafluoroethylene sealing ring in an embodiment of the present application using a chipless processing method.

[0028] Figure 3 It is a plan view of a sealing ring produced by a hot cutting device for a polytetrafluoroethylene sealing ring in an embodiment of the present application using a chipless processing method.

[0029] Figure 4 It is a schematic diagram of the cutting action of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the overall structure of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of the main structure of a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0032] Figure 7 It is a structural schematic diagram of a frame in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0033] Figure 8 It is a structural schematic diagram of a positioning member in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0034] Fig. 9 It is a structural schematic diagram of a lower cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0035] Fig.10 It is a structural schematic diagram of an upper cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0036] Fig.11 It is a structural schematic diagram of a flat cutting component in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0037] Fig.12 It is a structural schematic diagram of a lower cutter in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0038] Fig.13It is a structural schematic diagram of a tool setting standard part in a hot cutting device for a polytetrafluoroethylene sealing ring according to an embodiment of the present application.

[0039] Description of the accompanying drawings: 1, frame; 11, vertical plate; 111, flat cutting opening; 12, fixed seat; 121, upper cutting opening; 122, guide hole; 123, heating component; 124, insulation strip; 13, horizontal plate; 14, top plate; 15, slide rail; 16, flat cutting guide groove seat; 2, lower cutting component; 21, lower cutting drive member; 22, lower cutting slide plate; 23, lower cutting knife; 24, fixed block; 25, pressure plate; 26, guide column; 27, limit column; 28, Elastic part; 3. Upper cutting assembly; 31. Upper cutting drive member; 32. Upper cutting slide; 33. Upper cutting knife; 4. Horizontal cutting assembly; 41. Horizontal cutting drive member; 42. Horizontal cutting slide; 43. Horizontal cutting knife; 5. Positioning member; 51. Positioning seat; 511. Feeding edge; 512. Limiting cavity; 52. Positioning column; 6. Upper cutting guide groove; 7. Lower cutting guide groove; 8. Induction assembly; 9. Magnetic assembly; 10. Tool setting standard part; 101. Tool setting groove; 102. Threaded hole. DETAILED DESCRIPTION

[0040] The embodiment of the present application discloses a heat cutting device for polytetrafluoroethylene sealing rings, which is used for performing chip-free heat cutting processing on polytetrafluoroethylene sealing rings.

[0041] Figure 1 What is shown is a sealing ring processed by conventional chip processing method. Both ends of the sealing ring are reserved with embedded grooves and protruding embedded blocks, that is, forming an arm-shaped opening. The two ends of the sealing ring are completely closed by embedding and overlapping between the embedded grooves and the embedded blocks. The section where the two arms of the sealing ring overlap is called the opening section of the sealing ring.

[0042] Figures 2 to 4 What is shown is a sealing ring that is processed without chips using the hot cutting equipment for polytetrafluoroethylene sealing rings adopted in this application. The main principle is to stably sleeve the annular sealing ring on the outer periphery of the positioning column 52, and then the flat cutter 43 horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring. The horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts of equal thickness. The upper cutter 33 cuts one side of the opening section of the sealing ring to be processed from bottom to top, and the cutting depth of the upper cutter 33 is half of the thickness of the sealing ring, that is, the cutter of the upper cutting component 3 stops after cutting upwards to the horizontal cutting surface. The lower cutting component 2 cuts the other side of the opening section of the sealing ring to be processed from top to bottom, and the cutting depth of the lower cutting component 2 is half of the thickness of the sealing ring, that is, the cutter of the lower cutting component 2 stops after cutting downwards to the horizontal cutting surface. Thus, the sealing ring is cut out as follows. Figure 1 The arm-shaped opening shown.

[0043] Reference Figure 5 and Figure 6 Specifically, the hot cutting equipment of the polytetrafluoroethylene sealing ring includes a frame 1, a flat cutting component 4, an upper cutting component 3 and a lower cutting component 2. The frame 1 serves as an overall supporting structure for carrying the remaining components. The flat cutting component 4 is responsible for precise cutting in the horizontal direction. The upper cutting component 3 is mainly used for vertical cutting operations on the bottom of the opening end of the sealing ring, and the lower cutting component 2 is mainly used for vertical cutting operations on the top of the sealing ring. The components work together to effectively cut the opening section of the sealing ring.

[0044] Reference Figure 6 and Figure 7 The frame 1 includes a vertical plate 11 installed vertically on the workbench, a fixed seat 12 fixed horizontally at the front of the vertical plate 11, and a horizontal plate 13 fixed horizontally at the back of the vertical plate 11. Among them, a positioning member 5 is installed on the upper surface of the fixed seat 12 for positioning the sealing ring to be processed, and the positioning member 5 is close to the vertical plate 11. The lower cutting component 2 is arranged on the upper part of the vertical plate, the upper cutting component 3 is arranged on the lower part of the vertical plate 11, and the fixed seat 12 is located between the lower cutting component 2 and the upper cutting component 3. In addition, the fixed seat 12 is provided with an upper cutting opening 121 for the upper cutting component 3 to pass upward. The horizontal cutting component 4 is arranged on the back of the vertical plate 11, and the vertical plate 11 is provided with a horizontal cutting opening 111 for the horizontal cutting component 4 to pass horizontally. Each cutting action can be carried out in an orderly manner without interfering with each other. This structural arrangement effectively improves the space utilization rate of the equipment, reduces the risk of interference between components, and thus improves the processing efficiency and accuracy.

[0045] In this embodiment, the positioning member 5 includes a positioning seat 51 and a positioning column 52 fixed in the positioning seat 51. The outer peripheral surface of the positioning column 52 and the inner wall of the positioning seat 51 form a limiting cavity 512 adapted to the sealing ring. The sealing ring to be processed is set on the outer periphery of the positioning column 52. The positioning seat 51 plays a supporting role for the sealing ring to be processed, ensuring the accurate positioning of the sealing ring to be processed during the processing process, and avoiding processing errors caused by the offset of the sealing ring position. In addition, a side of the positioning seat 51 close to the flat cutting opening 111 is provided with an inlet 511 for the flat cutting component 4 to enter and exit, ensuring that the flat cutting component 4 can smoothly reach the opening section of the sealing ring for horizontal cutting operations.

[0046] Reference Figure 7 and Figure 8 In this embodiment, the positioning seat 51 is provided with a plurality of air holes, which are located at the bottom of the limiting cavity 512 and are spaced apart along the direction of the limiting cavity 512. By connecting the air holes to an external air source, the sealing ring can be automatically blown out of the limiting cavity 512 by air flow after the sealing ring is processed, thereby avoiding the inefficiency and possible product damage caused by manual material removal, and improving the degree of production automation and work efficiency.

[0047] In this embodiment, the fixing seat 12 is embedded with a heating component 123 and a thermal detection component. The heating component 123 is specifically a heating tube, which is arranged around the side of the limiting cavity 512. The heating component 123 can also be an electric heating wire or a microwave heating module, the purpose of which is to perform local heating and softening treatment on the contact area of ​​the sealing ring to be processed, so as to facilitate the subsequent cutting process to be smoother. The thermal detection component usually adopts a thermal detection needle, or a thermal detection system composed of a temperature sensor array, which can monitor the actual temperature value of the contact area of ​​the sealing ring to be processed in real time and maintain a constant state within the set range through a negative feedback mechanism to prevent overheating from causing deformation and damage of the material. These two components work closely together to ensure that the entire cutting process is always under the best working conditions.

[0048] In addition, the fixing base 12 is embedded with a heat insulation strip 124 . The heat insulation strip 124 is distributed outside the heating element 123 to prevent heat from being dissipated to the outer portion of the fixing base 12 .

[0049] Reference Figure 7 and Fig. 9 In this embodiment, the lower cutting assembly 2 includes a lower cutting slide 22 vertically slidably connected to the front of the vertical plate 11, a lower cutting knife 23 installed on the lower cutting slide 22, and a lower cutting drive 21 for driving the lower cutting slide 22 to slide up and down. The lower cutting slide 22 achieves stable sliding under the guidance of the vertical slide rail 15 on the front of the vertical plate 11. A top plate 14 for fixing the lower cutting drive 21 is installed on the top of the vertical plate 11. The lower cutting drive 21 is specifically a vertically downward electric push rod. The driving head of the lower cutting drive 21 is fixed on the surface of the lower cutting slide 22, thereby providing power for the lower cutting slide 22 to slide up and down. In addition, the lower cutting slide 22 and the lower cutting knife 23 are fixed by a fixing block 24 to improve the stability of the lower cutting knife 23.

[0050] In order to improve the movement stability of the lower cutting slide 22, a plurality of guide posts 26 are vertically fixed to the bottom of the lower cutting slide 22, and the fixing seat 12 is provided with guide holes 122 cooperating with the guide posts 26, so that the lower cutting slide 22 slides on a vertical line.

[0051] In this embodiment, a pressing plate 25 located directly above the positioning column 52 is installed at the bottom of the lower cutting slide 22. The pressing plate 25 is used to press the sealing ring to be processed. The bottom of the pressing plate 25 is recessed with a groove adapted to the top of the positioning column 52, so as to facilitate the insertion and matching with the top of the positioning column 52 during the pressing process, so as to facilitate the pressing plate 25 to complete the pressing action. Specifically, the pressing plate 25 is slidably matched with the lower cutting slide 22 through a plurality of vertical guide rods, and an elastic member 28 is installed between the pressing plate 25 and the lower cutting slide 22. The elastic member 28 is specifically a spring, and the spring is sleeved on the outer periphery of the guide rod. When the lower cutting component 2 is cutting the opening section of the sealing ring to be processed, the lower cutting driving member 21 drives the lower cutting slide 22 to move downward, and drives the pressure plate 25 to move downward. The pressure plate 25 first covers the upper surface of the sealing ring to be processed, and then the lower cutting slide 22 continues to move downward. Under the compression of the elastic member 28, the pressure plate 25 presses the sealing ring to be processed. At this time, the lower cutting knife 23 starts to cut the sealing ring to be processed.

[0052] In order to improve the stability of the lower cutter 23 during the lower cutting process, the side of the pressing plate 25 and the positioning column 52 close to the vertical plate 11 are both provided with a lower cutting guide groove 7 along the travel direction of the lower cutter 23. The lower cutting guide groove 7 can provide precise guidance for the travel of the lower cutter 23, ensuring that the lower cutter 23 moves along a predetermined trajectory during the cutting process to avoid cutting deviation. It should be noted that before and after the lower cutting assembly 2 performs the lower cutting work, the lower cutter 23 is always in the lower cutting guide groove 7 of the pressing plate 25. When the pressing plate 25 is pressed on the surface of the sealing ring to be processed, the lower end of the lower cutter 23 begins to enter the lower cutting guide groove 7 on the surface of the positioning column 52, and the whole process is completed under the guidance of the lower cutting guide groove 7, thereby improving the cutting accuracy of the lower cutter 23.

[0053] In this embodiment, in order to accurately control the cutting depth of the lower cutting component 2, a sensing component 8 is installed on the side of the lower cutting slide 22. In addition, a magnetic component 9 is fixed on the front of the vertical plate 11. The magnetic component 9 is located on the travel path of the sensing component 8 and is used to adjust and control the lower cutting stroke of the lower cutting component 2. The sensing component 8 (sensor) and the magnetic component 9 (magnet) are used to form a non-contact working principle of the proximity switch mechanism (such as a magnetic proximity switch or a Hall effect sensor). When the slide moves downward and the sensing component 8 enters the magnetic field range of the magnet, the sensor triggers a signal and the control system immediately stops the movement of the slide. Through the synergistic effect of the sensing component 8 and the magnetic component 9, the lower cutting stroke can be accurately adjusted within a preset range to avoid the problem of over-cutting or under-cutting, thereby effectively improving the cutting accuracy and product quality.

[0054] In addition, a limiting column 27 is vertically fixed at the bottom of the lower cutting slide 22. When the limiting column 27 reaches the surface of the fixed seat 12, the cutting depth of the lower cutting knife 23 is exactly half the thickness of the sealing ring. In the meantime, the limiting column 27 forces the lower cutting slide 22 to stop moving downward, thereby preventing the lower cutting knife 23 from cutting too deeply when the induction component 8 and the magnetic component 9 fail.

[0055] Reference Fig.10 and Fig.11 In this embodiment, the upper cutting component 3 includes an upper cutting drive 31, an upper cutting slide 32 and an upper cutting knife 33, and the horizontal cutting component 4 includes a horizontal cutting drive 41, a horizontal cutting slide 42 and a horizontal cutting knife 43. The structural components and working principles of the upper cutting component 3 and the horizontal cutting component 4 are substantially the same as those of the lower cutting component 2, including components that can accurately control the cutting depth, such as a limit column 27, a sensing component 8 and a magnetic component 9, etc. The main difference lies in the cutting direction.

[0056] In order to improve the cutting stability of the upper cutter 33, an upper cutting guide groove 6 is opened on the positioning seat 51 and the positioning column 52 on one side close to the feed port 511. The top of the upper cutting guide groove 6 of the positioning seat 51 is connected to the feed port 511, and the upper cutter 33 is finally in the upper cutting guide groove 6 to improve the cutting accuracy of the upper cutter 33.

[0057] In order to improve the cutting stability of the flat cutter 43, a flat cut guide groove seat 16 is installed at the connection between the upper cutting opening 121 of the fixed seat 12 and the flat cut opening 111 of the vertical plate 11. The flat cut guide groove seat 16 is T-shaped as a whole and slides with the fixed block 24 of the flat cutter 43, thereby improving the cutting accuracy of the lower cutter 23.

[0058] In this embodiment, the cut to be processed by the flat cutter 43 is a straight line, and the structure of the cutter is simple and easy to process. However, the cut to be processed by the upper cutter 33 and the lower cutter 23 is a curve, and the structure of the cutter is complex and difficult to process. This case proposes a solution to the processing and fastening structure of the upper and lower cutters.

[0059] Take the following cutter 23 as an example. Fig.12 As shown. The two sides of the lower cutter 23 are set at an angle of 1°. By using wire cutting and grinding the cutting edge, the cutter of the desired shape can be obtained. The fixing block 24 of the lower cutter 23 is also processed by wire cutting to form two tapered holes with a side angle of 1° to fit the lower cutter 23. Then a pad is used as an axial limiter and fixed to the fixing block 24, and the position of the lower cutter 23 will be tightened to prevent it from loosening.

[0060] The embodiment of the present application also discloses a method for hot cutting of a polytetrafluoroethylene sealing ring, using a hot cutting device for a polytetrafluoroethylene sealing ring, comprising the following steps: S1: Calibrate the cutter positions of the upper cutting component 3, the lower cutting component 2 and the flat cutting component 4. In the cutter calibration step, the cutter of the upper cutting component 3, the lower cutting component 2 and the flat cutting component 4 is calibrated by using the cutter standard part 10. The cutter position of the cutter standard part 10 is provided with a cutter groove 101 adapted to the cutter of the upper cutting component 3, the lower cutting component 2 and the flat cutting component 4. During the cutter calibration, the cutter standard part 10 is fixed at the positioning part 5, and then the flat cutting component 4, the upper cutting component 3 and the lower cutting component 2 are started successively. When the cutters of the flat cutting component 4, the upper cutting component 3 and the lower cutting component 2 can pass through the corresponding cutter grooves, the cutter calibration step is completed. Then tighten the cutter to ensure that the position of the cutter is accurate and not biased. The cutter standard part 10 is provided with a threaded hole 102 for convenient pick-up and placement operations.

[0061] The semi-finished sealing ring to be processed is turned out by a lathe, and then placed in an oven for heating to soften the sealing ring, and then the softened sealing ring to be processed is placed in the limiting cavity 512 at the positioning member 5, so as to realize the positioning of the sealing ring to be processed. The heating member at the fixing seat 12 heats the contact area of ​​the sealing ring to maintain a constant temperature.

[0062] S2: Start the flat cutting component 4, the flat cutting knife 43 of the flat cutting component 4 horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring, and the horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts with equal thickness.

[0063] S3: Start the upper cutting component 3 and the lower cutting component 2. The upper cutting knife 33 of the upper cutting component 3 cuts one side of the bottom of the opening section of the sealing ring to be processed from bottom to top. The upper cutting knife 33 of the upper cutting component 3 stops after cutting upward to the horizontal cutting surface. The lower cutting component 2 cuts the other side of the opening section of the sealing ring to be processed from top to bottom. The cutting knife of the lower cutting component 2 stops after cutting downward to the horizontal cutting surface, thereby cutting the annular sealing ring at the opening section and forming an arm opening. The sealing ring processing is completed. The upper cutting component 3 and the lower cutting component 2 can be started successively or simultaneously.

[0064] This processing method realizes chip-free processing, and the cutting part will not produce burrs, eliminating the trimming process. The cutting surface of the product fits tightly, the sealing effect is good, the processing accuracy required for the fitting surface is reduced, and the product quality is improved. The production defect rate is reduced. It also greatly increases the processing speed of the product and improves production efficiency.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A thermal cutting device for polytetrafluoroethylene sealing rings, characterized in that: include: A frame (1), wherein the frame (1) is provided with a positioning member (5) for positioning a sealing ring to be processed; A horizontal cutting component (4) is used to horizontally cut the opening section of the sealing ring to be processed from the outside to the inside, and cut the opening section of the sealing ring to form a horizontal cutting surface, and the horizontal cutting surface divides the opening section into two upper and lower parts; An upper cutting component (3) is used to cut from bottom to top one side of the opening section of the sealing ring to be processed, and the upper cutting component (3) stops cutting when it reaches a horizontal cutting surface; The lower cutting component (2) is used to cut from top to bottom the other side of the opening section of the sealing ring to be processed, and the lower cutting component (2) stops cutting at a horizontal cutting surface.

2. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 1, characterized in that: The positioning member (5) comprises a positioning seat (51) and a positioning column (52) arranged in the positioning seat (51); the outer peripheral surface of the positioning column (52) and the inner wall of the positioning seat (51) form a limiting cavity (512) adapted to the sealing ring; the positioning seat (51) is provided with an entry opening (511) through which the flat cutting component (4) can enter and exit.

3. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 2, characterized in that: The positioning seat (51) is provided with an air hole located at the bottom of the limiting cavity (512); the air hole is connected to an external air source and is used to blow the processed sealing ring out of the limiting cavity (512).

4. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 1, characterized in that: The frame (1) comprises a vertical plate (11), a fixing seat (12) arranged at the front of the vertical plate (11), and a horizontal plate (13) arranged at the back of the vertical plate (11); the positioning member (5) is arranged on the upper surface of the fixing seat (12); the lower cutting component (2) is arranged at the upper part of the vertical plate; the upper cutting component (3) is arranged at the lower part of the vertical plate (11); and the fixing seat (12) is provided with an upper cutting opening (121) through which the upper cutting component (3) can pass upward; the horizontal cutting component (4) is arranged at the back of the vertical plate (11); and the vertical plate (11) is provided with a horizontal cutting opening (111) through which the horizontal cutting component (4) can pass horizontally.

5. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 2, characterized in that: The lower cutting component (2) comprises a lower cutting slide plate (22) vertically slidably connected to the frame (1), a lower cutting knife (23) connected to the lower cutting slide plate (22), and a lower cutting driving member (21) for driving the lower cutting slide plate (22) to slide up and down. The lower cutting slide plate (22) is provided with a sensing component (8) on the side. The frame (1) is provided with a magnetic component (9). The magnetic component (9) is located on the travel path of the sensing component (8) and is used to adjust and control the lower cutting stroke of the lower cutting component (2).

6. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 5, characterized in that: A pressing plate (25) located above the positioning member (5) is provided at the bottom of the lower cutting slide plate (22), an elastic member (28) is provided between the pressing plate (25) and the lower cutting slide plate (22), and the pressing plate (25) is used to press the sealing ring to be processed.

7. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 6, characterized in that: Both the pressing plate (25) and the positioning column (52) are provided with a lower cutting guide groove (7) along the travel direction of the lower cutting knife (23).

8. The hot cutting device for polytetrafluoroethylene sealing ring according to claim 4, characterized in that: A heating component (123) and a heat detection component are arranged in the fixing seat (12); the heating component (123) is used to heat the area contacted by the sealing ring to be processed; and the heat detection component is used to keep the area contacted by the sealing ring to be processed at a constant temperature.

9. A method for hot cutting of a polytetrafluoroethylene sealing ring, using a hot cutting device for a polytetrafluoroethylene sealing ring as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1: calibrating the cutting positions of the upper cutting component (3), the lower cutting component (2) and the flat cutting component (4), and then fixing the sealing ring to be processed at the positioning member (5); S2: starting the horizontal cutting component (4), the horizontal cutting component (4) horizontally cuts the opening section of the sealing ring to be processed from the outside to the inside, and forms a horizontal cutting surface at the opening section of the sealing ring, the horizontal cutting surface cuts the opening section of the sealing ring to be processed into two upper and lower parts with equal thickness; S3: The upper cutting component (3) and the lower cutting component (2) are started, the upper cutting component (3) cuts one side of the opening section of the sealing ring to be processed from bottom to top, and the cutting knife of the upper cutting component (3) stops after cutting upward to the horizontal cutting surface; the lower cutting component (2) cuts the other side of the opening section of the sealing ring to be processed from top to bottom, and the cutting knife of the lower cutting component (2) stops after cutting downward to the horizontal cutting surface, and the sealing ring cutting process is completed.

10. A method for hot cutting a polytetrafluoroethylene sealing ring according to claim 9, characterized in that: In the tool calibration step of S1, a tool calibration standard part (10) is used to calibrate the cutters of the upper cutting component (3), the lower cutting component (2) and the flat cutting component (4). A tool calibration groove (101) matching the cutters of the upper cutting component (3), the lower cutting component (2) and the flat cutting component (4) is provided at the tool calibration position of the tool calibration standard part (10). During the tool calibration, the tool calibration standard part (10) is fixed at the positioning part (5), and then the flat cutting component (4), the upper cutting component (3) and the lower cutting component (2) are started in sequence. When the cutters of the flat cutting component (4), the upper cutting component (3) and the lower cutting component (2) can pass through the corresponding tool grooves, the tool calibration step is completed.

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