A hot cutting tool set and hot cutting method for automobile rubber parts

Abstract

The application discloses a hot cutting knife group and a hot cutting method for automobile rubber parts, and relates to the field of rubber part cutting, which comprises a frame, a vertically-liftable hot cutting knife installed in the frame, a pressure-bearing box located below the hot cutting knife and internally connected with a pricking strip through sliding, the pricking strip being located directly below the blade of the hot cutting knife and being provided with needle-shaped structures for pricking rubber parts at intervals along the length direction, the pricking strip having pricked the hot cutting knife to be cut position of the rubber part before the hot cutting knife contacts the rubber part, and the pricking strip and the hot cutting knife not interfering with each other. Compared with the prior art, the application effectively reduces the resistance of the hot cutting knife during the cutting of butyl damping rubber sheets, enables the butyl damping rubber sheets to be cut more easily, shortens the contact time of the hot cutting knife and the butyl rubber layer, and thus avoids the problems of glue overflow and adhesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rubber part cutting, in particular to a hot cutting knife set and hot cutting method for automobile rubber parts. BACKGROUND

[0002] Butyl damping rubber sheet is a viscoelastic polymer composite material made of butyl rubber (IIR) as the main material, usually with an aluminum foil, non-woven fabric or plastic film as a constraint layer, mainly used for damping, noise reduction, sound insulation and heat insulation of automobile parts. After the production process of butyl damping rubber sheet, such as batching, mixing, kneading, extrusion, compounding and stamping, it needs to be cut to the appropriate size by cutting equipment for subsequent packaging and storage processes.

[0003] The existing cutting equipment for butyl damping rubber sheet uses cold cutting tools, which uses a cylinder or other pushing assembly to control the intermittent movement of the cutting tool to cut the butyl damping rubber sheet. Some cutting equipment uses a PID controller and a thermocouple to control the temperature of the cutting tool to keep it at 150-180℃ when cutting the butyl damping rubber sheet. At this temperature, the butyl rubber has the best viscoelasticity, allowing for fast cutting of the butyl damping rubber sheet and quick recovery of the cut butyl damping rubber sheet.

[0004] A butyl rubber damping sheet semi-cutting device with precise forming is disclosed in Chinese Patent No. CN214489276U, which includes a base, a fixed frame, a top seat and a punching die. The fixed frame is fixedly installed on the upper surface of the base, and the top seat is fixedly installed on the top end of the fixed frame. The punching die is located above the base and is slidably connected with the fixed frame. The lower end of the top seat is provided with a reciprocating cylinder, which is located directly above the punching die. The extension end of the reciprocating cylinder is fixedly connected with a pressing plate, and the reciprocating cylinder contacts the top end of the punching die through the pressing plate.

[0005] For the above-mentioned related technology, the existing hot cutting knife needs to cut the aluminum foil, non-woven fabric or plastic film constraint layer on the surface of the butyl damping rubber sheet first. During the cutting of the constraint layer, the heat of the hot cutting knife is transferred to the butyl rubber layer, causing the butyl rubber to soften and deform under pressure. The hot cutting knife then cuts through the constraint layer and cuts the softened and deformed butyl rubber layer. Finally, the bottommost anti-sticking layer needs to be cut off to complete the cutting of the butyl damping rubber sheet. During the cutting process, the hot cutting knife is resisted by the composite layers of the butyl damping rubber sheet, prolonging the time it stays in the butyl rubber layer, which can easily cause overflow and adhesion problems at the cut edge of the butyl damping rubber sheet. In summary, the existing hot cutting knife set for automobile rubber parts can easily cause overflow and adhesion problems when cutting butyl damping rubber sheet. SUMMARY

[0006] Based on this, the purpose of the present application is to provide a hot cutting knife group and hot cutting method for automobile rubber parts to solve the technical problem that the existing hot cutting knife group for automobile rubber parts is prone to overflow and adhesion when cutting butyl damping rubber sheet.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solution: a hot cutting knife group for automobile rubber parts, comprising a frame, a hot cutting knife capable of vertical lifting is installed in the frame, a pressure box is located below the hot cutting knife, and a thorn strip is slidably connected inside the pressure box, the thorn strip is located directly below the blade of the hot cutting knife, and the needle-shaped structure for piercing the rubber part is arranged along the length direction, before the hot cutting knife contacts the rubber part, the thorn strip has already pierced the hot cutting knife cutting position of the rubber part, and the thorn strip and the hot cutting knife do not interfere with each other.

[0008] By adopting the above technical solution, before the hot cutting knife contacts the butyl damping rubber sheet to be cut, the needle-shaped structure arranged along the length direction of the thorn strip is used to pierce the butyl damping rubber sheet, and then the blade of the hot cutting knife coincides with the direction of the pierced hole to cut the butyl damping rubber sheet, compared with the prior art, the resistance of the hot cutting knife in the process of cutting the butyl damping rubber sheet is effectively reduced, the butyl damping rubber sheet can be cut more easily, the contact time of the hot cutting knife and the butyl rubber layer is shortened, and the problems of overflow and adhesion are avoided.

[0009] The present application is further provided that the two sides of the hot cutting knife are fixedly connected with fixed boxes, and the two fixed boxes are slidably connected with pressure boxes in the vertical direction on the side away from each other.

[0010] As a preferred, the pressure box is used to press the rubber part to be cut.

[0011] The present application is further provided that the two sides of the thorn strip are connected with guide strips, the second guide groove for the guide strip to slide is arranged in the vertical direction in the pressure box, the exhaust channel is arranged below each needle-shaped structure of the thorn strip, the cross membrane valve is installed in the exhaust channel, and the exhaust groove communicating with the exhaust channel is arranged on the two sides of the needle-shaped structure of the thorn strip.

[0012] As a preferred, the gas pressure is used to lift the thorn strip.

[0013] The present application is further provided that the end of at least one pressure box is connected with a downward gas delivery pipe, the gas delivery pipe is upwardly extended and connected with a gas interface, the plug-in interface is arranged at the position corresponding to the gas delivery pipe at the end of the pressure box, the plug-in interface is connected with the gas guide pipe in the inside of the pressure box, and the gas guide pipe is connected with the space below the thorn strip through the gas guide port.

[0014] As a preferred, the gas is delivered to the space below the thorn strip through the gas delivery pipe.

[0015] The heat cutter is fixedly connected with a downward pressing strip at both ends, and the bottom end of the pressing strip contacts the two ends of the pricking strip before the heat cutter contacts the rubber part.

[0016] As preferred, the pricking strip is pressed down by the pressing strip.

[0017] The fixed box is provided with a first guide groove in the vertical direction, the pressing box is provided with a protruding part towards the first guide groove, and a tension spring is arranged between the protruding part and the bottom end of the first guide groove.

[0018] As preferred, the elastic force of the tension spring further improves the pressing stability of the pressing box on the rubber part.

[0019] When the pricking strip moves upwards to contact the top end of the second guide groove, the needle-shaped structure on the pricking strip has already pricked the rubber part, and the pressing strip does not contact the pricking strip.

[0020] As preferred, the pricking strip and the heat cutter are prevented from interfering with each other.

[0021] The diameter of the insertion port is greater than the bottom end of the gas conveying pipe, and the insertion port is internally provided with a gas-tight part in contact with the outer wall of the gas conveying pipe, the bottom end of the gas conveying pipe is provided with a one-way valve, and the insertion port is internally mounted with a ejector pin for ejecting the one-way valve.

[0022] As preferred, the gas is prevented from being wasted before the gas conveying pipe is inserted into the insertion port.

[0023] The frame is rotatably connected with a protection plate at both sides, and the bottom end of the protection plate is higher than the top end of the pressure-bearing box.

[0024] As preferred, the protection plate is used to improve the safety of the heat cutter assembly.

[0025] A heat cutting method for an automobile rubber part, the blade temperature of the heat cutter is higher than 180℃ and lower than 190℃.

[0026] By adopting the above technical scheme, the appropriate heat cutting temperature is selected according to the rubber part with different thickness.

[0027] In summary, the present application mainly has the following advantages:

[0028] The application installs the capable-to-motion stab strip on the cutting position of the hot cutter, and the needle-shaped structure arranged along the length direction of the stab strip is used to perforate the butyl damping rubber sheet before the hot cutter contacts the butyl damping rubber sheet to be cut, then the blade of the hot cutter is coincided with the direction of the perforation arrangement to cut the butyl damping rubber sheet, compared with the prior art, the resistance of the hot cutter in the cutting process of the butyl damping rubber sheet is effectively reduced, the butyl damping rubber sheet can be more easily cut, the contact time of the hot cutter and the butyl damping rubber sheet is shortened, and the problems of overflow and adhesion are avoided.

[0029] The application drives the stab strip to rise by high-pressure gas, and the gas guide channel is arranged on each needle-shaped structure of the stab strip, the needle-shaped structure of the stab strip always faces the cutting seam during the cutting process of the butyl damping rubber sheet by the hot cutter, the gas flow from the gas guide channel can cool and radiate the butyl rubber at the cutting seam, the cut is quickly cooled, and the problems of overflow and adhesion are further avoided.

[0030] The application connects the fixed box to the two sides of the hot cutter, and the pressure box is connected to the fixed box in the vertical direction, the gas guide assembly arranged at the end of the pressure box is used to realize the functions of pressing the butyl damping rubber sheet and connecting the gas source for the rising of the stab strip during the descending process of the hot cutter, so that the perforation of the butyl damping rubber sheet is quickly realized, and the cutting of the butyl damping rubber sheet by the hot cutter is facilitated.

[0031] The application drives the stab strip to rise by high-pressure gas, and the gas guide channel is arranged on each needle-shaped structure of the stab strip, the needle-shaped structure of the stab strip always faces the cutting seam during the cutting process of the butyl damping rubber sheet by the hot cutter, the gas flow from the gas guide channel can cool and radiate the butyl rubber at the cutting seam, the cut is quickly cooled, and the problems of overflow and adhesion are further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a working state perspective view of the application.

[0033] Figure 2 It is a protective plate opened state perspective view of the application.

[0034] Figure 3 It is an internal structure perspective view of the application in the state that the cutter does not descend.

[0035] Figure 4 It is an internal structure plan view of the application in the state that the cutter does not descend.

[0036] Figure 5 It is an internal structure perspective view of the application in the state that the cutter does not descend. Figure 4 It is an enlarged view of A in the application.

[0037] Figure 6 It is an internal structure perspective view of the application in the state that the pressure box presses the rubber to be cut during the descending process of the cutter.

[0038] Figure 7 It is an internal structure perspective view of the application in the state that the cutter does not descend.Figure 6 Detail view of the middle B.

[0039] Figure 8 Internal structure plan view of the state of the cutter of the present invention pressing the rubber piece to be cut.

[0040] Figure 9 Internal structure perspective view of the state of the cutter of the present invention pressing the rubber piece to be cut. Figure 8 Detail view of the middle C.

[0041] Figure 10 Internal structure plan view of the state of the cutter of the present invention cutting the rubber piece.

[0042] Figure 11 Internal structure perspective view of the state of the cutter of the present invention cutting the rubber piece. Figure 10 Detail view of the middle D.

[0043] Figure 12 Internal structure plan view of the state of the cutter of the present invention cutting the rubber piece.

[0044] Figure 13 Internal structure perspective view of the state of the cutter of the present invention cutting the rubber piece. Figure 12 Detail view of the middle E.

[0045] Figure 14 Internal structure perspective view of the state of the cutter of the present invention cutting the rubber piece.

[0046] Figure 15 Internal structure perspective view of the state of the cutter of the present invention cutting the rubber piece. Figure 14 Detail view of the middle F.

[0047] Figure 16 Internal structure perspective view of the state of the rubber piece after being punctured by the puncture bar of the present invention.

[0048] Figure 17 Internal structure perspective view of the puncture bar of the present invention.

[0049] Figure 18 Internal structure perspective view of the puncture bar of the present invention from another angle.

[0050] Figure 19 Schematic view of the state of the butyl damping rubber sheet being cut by the hot cutter of the prior art, without cutting the constraint layer.

[0051] BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 1, frame; 101, sliding groove; 2, telescopic rod; 3, hot cutter; 4, fixed box; 401, first guide groove; 5, pressing box; 501, pressing piece; 6, pressure bearing box; 601, air guide pipe; 602, air guide port; 603, second guide groove; 7, air connection port; 8, air conveying pipe; 9, plug-in port; 10, pricking strip; 1001, guide strip; 1002, exhaust passage; 1003, exhaust groove; 1004, cross diaphragm valve; 11, pressing strip; 12, film body; 13, conveying line; 14, protective plate; 15, case. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0054] The embodiments of the present application will be described below according to the overall structure of the present application.

[0055] First embodiment:

[0056] A hot cutter set for an automobile rubber part, please refer to Figures 1-19 , comprising a frame 1, specifically, the frame 1 is installed at the top end of a case 15, the case 15 is internally provided with components such as an air compressor and a compressed gas tank, and the frame 1 is internally provided with a hot cutter 3 capable of vertical lifting, specifically, the heating principle of the hot cutter 3 is not improved in the present application, and therefore the heating principle is not described in detail.

[0057] Specifically, the automobile rubber part in the present application is specifically a butyl damping film, that is, a film body 12, which is specifically composed of an aluminum film layer as a surface layer, a butyl rubber layer as a middle layer, and an anti-sticking layer as a bottom layer. In other unpublished embodiments, various rubber-containing films suitable for hot cutting can also be selected.

[0058] Further comprising a pressure bearing box 6, the bottom surface of the pressure bearing box 6 contacts the top surface of a conveying line 13 for butyl damping film production, specifically, the two ends of the bottom surface of the pressure bearing box 6 respectively contact the frames on both sides of the conveying line 13, the bottom surface of the pressure bearing box 6 does not directly contact the conveying belt, thereby avoiding unnecessary wear caused by friction between the pressure bearing box 6 and the conveying belt, the pressure bearing box 6 is located below the hot cutter 3 and internally slidably connected with a pricking strip 10, specifically, the pressure bearing box 6 is slidably connected in a sliding groove 101 of the frame 1.

[0059] Furthermore, the barbs 10 are located directly below the blade of the hot cutting blade 3, and are spaced along the length direction with needle-like structures for piercing the rubber part. Specifically, the spacing of the needle-like structures is adaptively adjusted according to the butyl damping rubber covered with a constraint layer of different thickness and material. In this embodiment, the specific spacing of the needle-like structures on the barbs 10 is 10mm. Before the hot cutting blade 3 contacts the rubber part, the barbs 10 have already pierced the position of the hot cutting blade 3 to be cut on the rubber part. The barbs 10 and the hot cutting blade 3 will not interfere with each other. In other undisclosed embodiments, the blade of the hot cutting blade 3 can also protrude downward at the position corresponding to the needle-like structure on the barbs 10, which can more easily cut through the constraint layer of the butyl damping rubber sheet, but will increase the manufacturing difficulty of the hot cutting blade 3.

[0060] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-7 Both sides of the hot cutting blade 3 are fixedly connected to a fixing box 4. The two fixing boxes 4 are slidably connected to a pressure box 5 in the vertical direction on the side that is far away from each other. The pressure box 5 is used to press the rubber part to be cut. Specifically, the bottom end of the pressure box 5 is also fixedly connected to a pressure plate 501. The two pressure plates 501 extend towards each other without interfering with the hot cutting blade 3 and the barbed strip 10, so as to better press the butyl damping film and avoid it from being deformed during the cutting process.

[0061] Furthermore, the side wall of the fixing box 4 is provided with a first guide groove 401 in the vertical direction, and the pressure box 5 is provided with a protrusion facing the first guide groove 401. A tension spring is provided between the protrusion and the bottom end of the first guide groove 401. The elastic force of the tension spring is used to further improve the pressing stability of the pressure box 5 on the rubber part. Specifically, when the pressure plate 501 at the bottom end of the pressure box 5 contacts the butyl damping film, the pressure box 5 cannot continue to descend. As the height of the fixing box 4 continues to decrease, the tension spring between the pressure box 5 and the fixing box 4 is gradually stretched. The elastic force generated by the stretching of the tension spring can be applied to the surface of the butyl damping film through the pressure box 5 to further press the butyl damping film. Similarly, in other undisclosed embodiments, a compression spring can be provided between the protrusion of the pressure box 5 and the top end of the first guide groove 401.

[0062] For details regarding the above embodiments, please refer to [link / reference]. Figures 5-6 , Figures 14-15 Both ends of the hot cutting blade 3 are fixedly connected with downward-facing pressure strips 11. Before the hot cutting blade 3 contacts the rubber part, the bottom end of the pressure strip 11 has already contacted both ends of the barbed strip 10. The pressure strip 11 is used to press down the barbed strip 10. Before the hot cutting blade 3 contacts the needle-like structure on the barbed strip 10, the pressure strip 11 will first contact both ends of the barbed strip 10, thereby avoiding mutual interference between the barbed strip 10 and the hot cutting blade 3 during the process of cutting the butyl damping film by lowering the height of the hot cutting blade 3.

[0063] A hot cutting method of automobile rubber parts, when the rubber part to be cut is a butyl damping rubber sheet, and the thickness is 2.5mm, the blade temperature of the hot cutter 3 is 182℃.

[0064] Second embodiment:

[0065] A hot cutter group of automobile rubber parts, please refer to Figures 1-19 On the basis of the first embodiment, different from the first embodiment is that the two sides of the strip 10 are connected with the guide strip 1001, and the second guide groove 603 for the guide strip 1001 to slide is arranged in the vertical direction in the pressure box 6. Specifically, when the bottom end of the guide strip 1001 contacts the bottom end of the second guide groove 603, the needle-shaped structure on the strip 10 is lower than the top surface of the pressure box 6, and the bottom surface of the strip 10 is higher than the height of the air inlet 602.

[0066] Further, the strip 10 is provided with an exhaust passage 1002 below each needle-shaped structure, and a cross membrane valve 1004 is installed in the exhaust passage 1002. Specifically, under the premise that the air pressure is sufficient, the cross membrane valve 1004 will open the air passage, and the two sides of the needle-shaped structure on the strip 10 are provided with an exhaust groove 1003 communicating with the exhaust passage 1002. The strip 10 is lifted by air pressure, and after the strip 10 rises to the highest point, the gas input into the pressure box 6 by the gas inlet pipe 8 will blow to the cut seam of the butyl damping rubber sheet through the exhaust passage 1002 and the exhaust groove 1003.

[0067] In the above embodiment, specifically, please refer to Figures 1-5 , Figures 10-11 The end of at least one pressure box 5 is connected with a downward gas inlet pipe 8, the gas inlet pipe 8 extends upward and is communicated with a gas interface 7, specifically, the gas interface 7 is used to connect a high-pressure gas tank located in the case 15 through a gas inlet hose, and the end of the pressure box 6 corresponds to the position of the gas inlet pipe 8, and a plug interface 9 is arranged correspondingly, the plug interface 9 is communicated with a gas guide pipe 601 located in the inside of the pressure box 6, the gas guide pipe 601 is communicated with the space below the strip 10 through the air inlet 602, and the gas is input into the space below the strip 10 by the gas inlet pipe 8.

[0068] Specifically, when the strip 10 moves upward to the top end of the guide strip 1001 contacting the second guide groove 603, the needle-shaped structure on the strip 10 has been pierced through the rubber part, and the pressing strip 11 does not contact the strip 10, avoiding the interference between the strip 10 and the hot cutter 3.

[0069] Further, the diameter of the plug-in interface 9 is larger than the bottom end of the gas delivery pipe 8, and is internally provided with an air-tight member in contact with the outer wall of the gas delivery pipe 8. In the embodiment, the air-tight member is specifically an O-shaped rubber ring, the bottom end of the gas delivery pipe 8 penetrates the inner ring of the O-shaped rubber ring, and in the process of continuing to be inserted downward, the O-shaped rubber ring is pressed tightly between the inner wall of the plug-in interface 9 and the outer wall of the gas delivery pipe 8, thereby forming an effective air-tightness. The bottom end of the gas delivery pipe 8 is provided with a one-way valve, and the plug-in interface 9 is internally provided with a thimble for opening the one-way valve. Before the gas delivery pipe 8 is inserted into the plug-in interface 9, the one-way valve of the gas delivery pipe 8 avoids gas waste. Specifically, the one-way valve at the bottom end of the gas delivery pipe 8 is similar to the structure of a valve core, and the thimble at the plug-in interface 9 can push the one-way valve of the gas delivery pipe 8 to realize the air flow of the gas delivery pipe 8 into the pressure-bearing box 6.

[0070] In the above embodiment, specifically, please refer to Figures 1-2 , both sides of the frame 1 are rotationally connected with the protective plate 14. Specifically, the protective plate 14 is a frame structure connected with a transparent plate at the middle part, which plays a protective role while facilitating workers to observe the state of the cutting seam. The bottom end of the protective plate 14 is higher than the top end of the pressure-bearing box 6. Specifically, there is still space between the top end of the protective plate 14 and the top end of the pressure-bearing box 6 for the butyl damping rubber sheet to pass through, so as to avoid the butyl damping rubber sheet from being scratched by the protective plate 14 during the conveying process. The protective plate 14 is used to improve the safety of the hot cutter assembly.

[0071] A hot cutting method of an automobile rubber part, when the rubber part to be cut is specifically a butyl damping rubber sheet and the thickness is 6mm, the temperature of the blade of the hot cutter 3 is 190℃.

[0072] In specific work, the pressure-bearing box 6 is placed on the conveying line 13, and the butyl damping rubber sheet conveyed on the conveying line 13 passes around the top end of the pressure-bearing box 6. When the butyl damping rubber sheet needs to be cut, the telescopic rod 2 is elongated to lower the height of the hot cutter 3 and move towards the butyl damping rubber sheet.

[0073] The pressing piece 501 at the bottom end of the pressing box 5 contacts the butyl damping rubber sheet and presses it tightly on the surface of the pressure-bearing box 6. The bottom end of the gas delivery pipe 8 provided at the end of the pressing box 5 is inserted into the plug-in interface 9 to deliver gas into the gas guide pipe 601 in the pressure-bearing box 6. The high-pressure gas flows along the gas guide pipe 601 and flows out from the plurality of gas guide openings 602. The gas flows to the lower side of the prong 10. Due to the increased air pressure below the prong 10, the prong 10 is pushed to slide upward. The needle-shaped structure on the prong 10 pierces the butyl damping rubber sheet to form a dotted line composed of perforations on the butyl damping rubber sheet. When the prong 10 stops moving upward, due to the continuous increase of the air pressure below, the gas input into the pressure-bearing box 6 from the gas delivery pipe 8 can be discharged along the exhaust passage 1002 after the pressure exceeds the pressure that can be closed by the cross membrane valve 1004.

[0074] With the continuous lowering of the height of the hot cutter 3, the pressing strips 11 connected to the two ends of the hot cutter 3 contact the two ends of the pricking strip 10, and the hot cutter 3 continues to move downward to cut the butyl damping rubber sheet. When cutting the butyl damping rubber sheet, the resistance of the hot cutter 3 is obviously reduced because the corresponding position of the hot cutter 3 is provided with a perforation. In addition, the gas blown upward by the exhaust passage 1002 and the exhaust groove 1003 can accurately achieve the cooling of the cutting seam, effectively avoiding the problems of glue overflow or adhesion of the hot cutter 3 when cutting the butyl damping rubber sheet.

[0075] Although the embodiments of the present application have been shown and described, the specific embodiments are merely illustrative of the present application, and are not intended to limit the present application. The specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification, as long as they are within the scope of the claims of the present application.

Claims

1. A hot knife assembly for cutting an automotive rubber part, the hot knife assembly comprising: The utility model relates to a hot cutting knife set for automobile rubber parts, which comprises a frame, a hot cutting knife capable of vertical lifting installed in the frame, a pressure box located below the hot cutting knife, a stab strip slidably connected inside the pressure box, the stab strip being located directly below the blade of the hot cutting knife and being provided with needle-shaped structures for piercing rubber parts at intervals along the length direction, the stab strip having pierced the position to be cut by the hot cutting knife of the rubber part before the hot cutting knife contacts the rubber part, the stab strip and the hot cutting knife not interfering with each other, two fixed boxes fixedly connected to the two sides of the hot cutting knife, two pressure boxes slidably connected to the sides away from each other of the two fixed boxes along the vertical direction, an exhaust passage provided below each needle-shaped structure of the stab strip, a cross diaphragm valve installed in the exhaust passage, an exhaust groove communicating with the exhaust passage provided on the two sides of the needle-shaped structure of the stab strip, a guide strip connected to the two sides of the stab strip, a second guide groove provided in the pressure box along the vertical direction for the guide strip to slide, a gas delivery pipe connected to the end of at least one pressure box and extending upward to communicate with a gas connection port, a plug-in port provided at the end of the pressure box corresponding to the position of the gas delivery pipe, a gas guide pipe communicating with the space below the stab strip through a gas guide port, a pressing strip fixedly connected to the two ends of the hot cutting knife and facing downward, the bottom end of the pressing strip having contacted the two ends of the stab strip before the hot cutting knife contacts the rubber part, the needle-shaped structure of the stab strip having pierced the rubber part when the stab strip moves upward to the top end of the second guide groove where the guide strip contacts the second guide groove, the diameter of the plug-in port being larger than the bottom end of the gas delivery pipe, the plug-in port being provided with an air-tight member inside and contacting the outer wall of the gas delivery pipe, the bottom end of the gas delivery pipe being provided with a one-way valve, and a thimble installed in the plug-in port for pushing open the one-way valve. The side wall of the fixed box is provided with a first guide groove along the vertical direction, the pressure box is provided with a protruding part towards the first guide groove, and a tension spring is arranged between the protruding part and the bottom end of the first guide groove. The frame is rotatably connected with a protective plate on both sides, and the bottom end of the protective plate is higher than the top end of the pressure box.

2. The hot knife cutting assembly for automotive rubber parts of claim 1, wherein: The hot cutting knife of the hot cutting knife set for automobile rubber parts according to any one of claims 1-3 has a blade temperature higher than 180℃ and lower than 190℃.

3. The hot knife cutting assembly for automotive rubber parts of claim 1, wherein: ​ 4. A method of hot cutting of an automotive rubber part, characterized in that ​

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