A continuous molding pipe mold for automobile muffler exhaust straight pipe and a straight pipe processing method based on the mold

Abstract

The present invention discloses a continuous mold for automobile muffler exhaust straight pipes, including an upper mold assembly and a lower mold assembly on a machine body, characterized in that: the machine body is provided with a punching assembly, a guiding assembly, a curling assembly and a cutting assembly in sequence from the feed end to the discharge end, and the punching assembly, the curling assembly and the cutting assembly are arranged in sequence based on the upper mold assembly and the lower mold assembly, and the punching, curling and cutting processes are completed in one time based on the upper and lower movements of the upper and lower mold assemblies. The device can realize the punching, cutting, guiding, curling and cutting processes in one time by the upper and lower movements of the upper and lower mold assemblies; the continuous processing of the materials can be continuous, and finally a straight automobile muffler exhaust straight pipe is formed, and each process and feature is combined in a set of continuous molds, so as to achieve the purpose of reducing the production process and the production cost generated by human resources and other links and improving the efficiency. The processing method based on the mold is simple, practical and effective.

Description

Technical Field

[0001] The invention relates to the technical field of automobile accessories, in particular to a continuous molding pipe mold for automobile muffler exhaust straight pipes. Background Art

[0002] With the rapid development of the economy, cars have gradually become popular in people's daily lives. my country's automobile industry is facing a rare opportunity to upgrade and transform from big to strong. In this environment, how to consolidate the production base of automobile parts, enhance technological innovation capabilities, reduce production costs and enhance competitiveness are important issues facing Chinese automobile manufacturers.

[0003] Automobile muffler pipe is one of the important spare parts of automobiles, which plays the role of silencing and reducing noise, bringing comfort to the driver and other passengers in the car. The traditional stamping production process of automobile muffler exhaust system pipe products includes punching, pre-rolling, and rolling. Each process is processed separately. The equipment, mold and personnel costs are relatively high in the stamping production process of parts. Therefore, we propose a continuous molding mold for automobile muffler exhaust straight pipes and a processing method based on this mold. Summary of the invention

[0004] The object of the present invention is to provide a continuous molding die for automobile muffler exhaust straight pipes, comprising an upper mold assembly and a lower mold assembly on a machine body, and characterized in that: the machine body is provided with a punching assembly, a guiding assembly, a curling assembly and a cutting assembly in sequence from the feed end to the discharge end, and the punching assembly, the curling assembly and the cutting assembly are arranged in sequence based on the upper mold assembly and the lower mold assembly, and the punching, curling and cutting processes are completed in one up and down movement of the upper mold assembly and the lower mold assembly.

[0005] The lower die assembly comprises a lower supporting plate, a pad and a lower die base, a plurality of pads are fixedly mounted on the upper surface of the lower supporting plate, a lower die base is fixedly mounted on the top of the pad, and a lower pad is fixedly mounted above the lower die base at positions corresponding to the punching assembly, the guide assembly and the curling assembly;

[0006] The upper die assembly comprises an upper die seat and an upper pad, and the upper pad is installed on the lower surface of the upper die seat at the positions corresponding to the punching assembly, the guide assembly and the rolling die assembly.

[0007] The punching assembly includes a punching punch and a cutting punch, which are respectively fixedly mounted on the upper die seat. The punching assembly also includes a floating block, which is fixedly mounted on the lower pad. A stripping plate is provided on the upper die assembly corresponding to the floating block, and the stripping plate is fixedly mounted below the upper pad.

[0008] There are two cutting punches, which are respectively arranged at the two ends of the central axis of the plate. A spacing position is arranged between the two cutting punches, so that a continuous material of the plate material is formed after cutting.

[0009] The upper pad plate and the stripping plate are provided with reserved holes corresponding to the punching punch and the cutting punch, so as to facilitate the punching punch and the cutting punch to move up and down.

[0010] The guide assembly includes a guide pin, which is fixedly mounted on a lower pad of the lower die assembly.

[0011] The rolling component includes a round core rod, an upper die and a lower die corresponding to the upper and lower semicircles, the upper die and the lower die are respectively arranged on the upper pad of the upper die assembly and the lower pad of the lower die assembly corresponding to the position of the rolling component, and the round core rod is arranged between the upper die and the lower die.

[0012] Floating mechanisms for supporting the sheet material are provided on both sides of the corresponding rolling components. The floating mechanisms on both sides include a support column, a positioning pin, a supporting block, and an ejector pin. The ejector pin is a spring-loaded retractable ejector pin. One end of the supporting block is hinged on the support column through an axle pin, and the middle end is connected to the top of the ejector pin. The positioning pin is fixedly connected to the support column and is arranged directly above the supporting block when the support column is in a horizontal state. The ejector pin is fixedly connected to the lower pad through a spring, and the ejector pin drives one end of the supporting block to move up and down along the axle pin through spring compression. The support column is fixedly mounted on the lower pad through bolts.

[0013] The cutting assembly comprises a slitting mechanism, a circular tubular fixing structure and a cutting mandrel.

[0014] The slitting mechanism includes a slitting knife, a side push block, a slider, a backing plate and an inclined wedge. The backing plate is fixedly mounted on the upper die seat. A slide groove is transversely arranged on one side of the upper die seat corresponding to the backing plate. The slide groove is installed with a slider. The middle side end of the slider is fixedly connected to the side push block. The slider is connected with a slider spring in the slide groove to protect the slider from driving the side push block to move too much to the right side. The inclined wedge is arranged on the lower die seat corresponding to the slider directly below the lower die seat, and the slider is pushed to move to the right by the inclined wedge. The lower side end of the slider is provided with a corresponding matching wedge position.

[0015] The circular tubular fixed structure comprises a semicircular upper recess fixedly connected to the upper die seat, and a semicircular lower recess fixedly connected to the lower die seat. A telescopic spring is arranged in the middle of the semicircular upper recess, and the spatial variation of the upper and lower thickness of the semicircular upper recess is achieved by the telescopic spring. A transverse through hole is arranged at the position corresponding to the side push block, and a longitudinal through hole communicating with the transverse through hole is arranged corresponding to the transverse through hole. The longitudinal through hole is provided with the above-mentioned slitting knife, and the slitting knife is driven to move up and down by the movement of the side push block;

[0016] The cutting mandrel is an extension of the round mandrel, and a cutout hole is provided at a position just below the slitting knife.

[0017] The upper die moves downward, and the inclined wedge contacts the slider that moves downward with the upper die. Under the action of the support plate, the slider is pushed to the right by the inclined wedge. The slider spring contracts and pushes the side push block to move to the right. During the rightward movement of the side push block, it contacts the slitting knife installed in the upper recess of the semicircle, and the slitting knife moves downward under the action of the inclined edge. The slitting knife passes through the upper recess of the semicircle and extends to the bottom, and cuts off the position where the pipe product is connected with the cutting mandrel.

[0018] The contact drive between the side push block and the slitting knife is still an oblique wedge matching structure;

[0019] The slitting knife has a 7-shaped connecting head and an upper die seat correspondingly provided with 7-shaped slots to form a sliding connection structure.

[0020] The cutting mandrel is provided with a waste groove, and the slitting knife passes through the upper recess of the semicircle and extends to the bottom, cuts off the position where the pipe product is connected with the cutting mandrel, and pushes the waste into the waste groove in the cutting mandrel. The compressed air connected to the outside is introduced into the air hole to blow the waste falling in the waste groove out of the mandrel.

[0021] A straight pipe processing method based on the above-mentioned pipe making mold is characterized by:

[0022] The following steps are involved:

[0023] S1. Select a plate of a certain width, use the conveying structure to convey it to the feed end, and then enter the punching assembly position, the guiding assembly position, the curling assembly position and the cutting assembly position in sequence;

[0024] S2. The punching punch and the cutting punch of the punching assembly complete the punching of the sheet and the positioning of the intermediate band spacing, and complete the positioning of the sheet and the intermediate band spacing and the forming of the continuous material;

[0025] The punching positioning of the plate is completed by the guiding component;

[0026] The perforated sheet material is rolled in sections by the rolling assembly;

[0027] The cutting assembly completes the final slitting of the coiled material;

[0028] The work of each component is completed by the upper and lower mold assembly moving up and down at one time, completing the punching, cutting, guiding, curling and cutting processes at one time;

[0029] The discharge end outputs a tubular automobile muffler exhaust straight pipe with holes;

[0030] Output in a continuous delivery manner.

[0031] For example, if there are step requirements on some pipe fittings, the continuous mold can first produce them in a straight tube state, and then use the expansion or shrinking process to achieve the forming of the pipe step. Therefore, the continuous mold can still be used for continuous pipe production and processing.

[0032] The beneficial effects of the present invention are as follows: the device can realize the upper and lower movements of the upper die assembly and the lower die assembly at one time, and complete the punching, cutting, guiding, curling, and cutting processes at one time; the continuous plate material is directly processed by connection, and finally a straight tube-shaped automobile muffler exhaust straight pipe is formed, which has the advantages of high processing efficiency and low cost, and can realize the continuous molding and stamping production of straight pipe parts, and combine various processes and characteristics on a set of continuous dies to realize the function of continuous stamping production of inner tube curling. Thereby achieving the purpose of reducing the production costs generated by production processes and human resources and improving benefits.

[0033] The processing method based on the mold is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an overall schematic diagram of the structural layout of the present invention.

[0035] Figure 2 It is a structural side view of the present invention.

[0036] Figure 3 This is a three-dimensional structural reference diagram of the present invention (upper and lower modules are opened).

[0037] Figure 4 It is a schematic diagram of the principle of the rolling station in the present invention.

[0038] Figure 5 It is a schematic diagram of the structure of the rolling component in the present invention (including the floating material mechanism).

[0039] Figure 6 It is a structural schematic diagram of the slitting mechanism in the present invention.

[0040] Figure 7 It is a schematic diagram of the connection structure between the slitting knife and the upper die base in the present invention.

[0041] Figure 8 It is a schematic diagram of forming a pipe product based on the structure of the present invention.

[0042] In the figure: 1-body, 2-floating block, 3-punching punch, 4-cutting punch, 5-guide pin, 6-rolling mandrel, 7-slitting mechanism, 8-support column, 9-positioning pin, 10-support block, 11-punching assembly, 12-guide assembly, 13-rolling assembly, 14-cutting assembly, 141-upper die, 142-semicircle upper recess, 15-thrust pin, 16-lower die, 161-lower recess, 1 7-lower support plate, 18-foot pad, 19-lower die base, 20-upper die base, 21-upper pad, 22-stripping plate, 23-lower pad, 26-slitting knife, 27-side push block, 28-slider, 29-back plate, 30-wedge, 31-cutting core rod, 32-waste groove, 33-cut hole, 34-slider spring, 36-telescopic spring, 25-plate, 251-molding pipe, 252-connecting material. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 8 A continuous molding die for a straight muffler exhaust pipe of an automobile comprises an upper die assembly and a lower die assembly on a body 1. The body 1 is provided with a punching assembly 11, a guiding assembly 12, a curling assembly 13 and a cutting assembly 14 in sequence from a feeding end to a discharging end. The punching assembly 11, the curling assembly 13 and the cutting assembly 14 are arranged in sequence based on an upper die assembly and a lower die assembly. The punching, curling and cutting processes are completed in one up and down movement of the upper die assembly and the lower die assembly.

[0045] The lower die assembly includes a lower support plate 17, a pad 18 and a lower die base 19. A plurality of pads 18 are fixedly mounted on the upper surface of the lower support plate 17. The lower die base 19 is fixedly mounted on the top of the pad 18. A lower pad 23 is fixedly mounted above the lower die base 19 at positions corresponding to the punching assembly, the guide assembly and the curling assembly.

[0046] The upper die assembly comprises an upper die base 20 and an upper pad 21 . The upper pad 21 is installed on the lower surface of the upper die base 20 at the positions corresponding to the punching assembly, the guide assembly and the rolling die assembly.

[0047] The punching assembly 11 includes a punching punch 3 and a cutting punch 4, which are respectively fixedly mounted on an upper die seat 20. The punching assembly 11 also includes a floating block 2, which is fixedly mounted on a lower pad 23. A stripping plate 22 is provided on the upper die assembly corresponding to the floating block 2, and the stripping plate 22 is fixedly mounted below the upper pad 21.

[0048] There are two cutting punches 4, which are respectively arranged at the two ends of the central axis of the plate, and a spacing position is arranged between the two cutting punches 4. After cutting, a continuous material of the plate material is formed.

[0049] The upper pad 21 and the stripping plate 22 are provided with reserved holes corresponding to the punching punch 3 and the cutting punch 4, so as to facilitate the punching punch 3 and the cutting punch 4 to move upward and downward.

[0050] The guide assembly 12 includes a guide pin 5, which is fixedly mounted on a lower pad 23 of the lower die assembly.

[0051] The punching holes can be changed to different positions according to actual needs, and the guide pins can also be changed accordingly. Figure 1 and Figure 2 The punch holes and guide pins shown are not in the same position. Figure 1 The number of the guide pins 5 is two groups, and the spacing between the two groups of guide pins 5 is twice the spacing between adjacent punching holes on the raw material.

[0052] The rolling assembly 13 includes a round core rod 6, an upper die 141 and a lower die 16 corresponding to the upper and lower semicircles, the upper die 141 and the lower die 16 are respectively arranged on the upper pad 21 of the upper die assembly and the lower pad 23 of the lower die assembly corresponding to the position of the rolling assembly 13, and the round core rod 6 is arranged between the upper die 141 and the lower die 16. A compression spring is arranged at the lower end of the round core rod 6 and connected to the lower die seat 19, so that the pressing plate 25 can be deformed into a round tube as the upper die assembly moves downward and the die 141 and the lower die 16 cooperate, that is, as the upper die assembly moves downward and is compressed with the increased pressure, the plate 25 is first changed into an inverted U shape by the round core rod 6, and then deformed by the lower die as the downward pressure continues to be applied, forming a round tube 251.

[0053] The lower mold assembly of the machine body 1 is provided with floating material mechanisms for supporting the sheet materials on both sides corresponding to the rolling assembly 13. The floating material mechanisms on both sides include a support column 8, a positioning pin 9, a support block 10, and an ejector 15. The ejector is a spring-loaded retractable ejector. One end of the support block 10 is hinged on the support column 8 through an axle pin, and the middle end is connected to the top of the ejector. The positioning pin 9 is fixedly connected to the support column 8 and is arranged directly above the support block 10 when the support column 8 is in a horizontal state. The ejector is fixedly connected to the lower pad 23 through a spring. The ejector 15 drives one end of the support block 10 to move up and down along the axle pin through spring compression. The support column 8 is fixedly mounted on the lower pad 23 by bolts.

[0054] The cutting assembly 14 includes a slitting mechanism 7 , a cylindrical fixing structure and a cutting mandrel 31 .

[0055] The slitting mechanism 7 includes a slitting knife 26, a side push block 27, a slider 28, a support plate 29 and an oblique wedge 30. The support plate 29 is fixedly mounted on the upper die seat 20. A slide groove is transversely arranged on one side of the upper die seat 20 corresponding to the support plate 29. The slide groove is provided with a slide block 28. The middle side end of the slide block 28 is fixedly connected to the side push block 27. The slide block 28 is connected with a slide block spring 34 in the slide groove to prevent the slide block 28 from moving too far to the right side. The oblique wedge 30 is arranged on the lower die seat 19 corresponding to the slide block 28, and the slide block 28 is pushed to move to the right by the oblique wedge 30. The lower side end of the slide block 28 is provided with a corresponding matching wedge position.

[0056] The circular tubular fixed structure includes a semicircular upper recess 142 fixedly connected to the upper die seat 20, and a semicircular lower recess 161 fixedly connected to the lower die seat 19. A telescopic spring is provided in the middle of the semicircular upper recess 142, and the telescopic spring 36 is used to achieve the spatial change of the upper and lower thickness of the semicircular upper recess 142. A transverse through hole is provided at the position corresponding to the side push block 27, and a longitudinal through hole communicating with the transverse through hole is provided. The longitudinal through hole is provided with the above-mentioned slitting knife 26, and the slitting knife 26 is driven by the movement of the side push block 27 to move up and down;

[0057] The cutting mandrel 31 is an extension of the round mandrel 6, and a cutout hole is provided at a position just below the slitting knife 26;

[0058] The upper die moves downward, and the inclined wedge 30 contacts the slider 28 that moves downward with the upper die. Under the action of the support plate 29, the slider 28 is pushed to the right by the inclined wedge 30. The slider spring 34 contracts and pushes the side push block 27 to move to the right. During the rightward movement of the side push block 27, the slitting knife 26 installed in the semicircular upper recess 142 is contacted, and the slitting knife 26 moves downward under the action of the bevel. The slitting knife 26 passes through the semicircular upper recess 142 and extends to the bottom, and cuts off the position where the pipe product is connected with the cutting mandrel 31.

[0059] The contact drive between the side push block 27 and the slitting knife 26 is still an oblique wedge matching structure;

[0060] The slitting knife 26 has a 7-shaped connector and an upper die seat that is provided with a 7-shaped slot to form a sliding connection structure.

[0061] The cutting mandrel 31 is provided with a waste groove 32, and the slitting knife 26 passes through the semicircular upper recess 142 and extends to the bottom, cuts off the position where the pipe product is connected with the cutting mandrel 31, and pushes the waste into the waste groove 32 in the cutting mandrel 31. The compressed air connected to the outside is introduced into the air hole to blow the waste falling in the waste groove out of the mandrel.

[0062] The slitting position of the pipe is the end face of the pipe. When rolling, the length of the rolling die must not be less than the end face of the pipe to ensure the effective rolling of the pipe. Therefore, the slitting position of this proposed scheme needs to be set inside the rolling die. Through the mandrel structure, the waste needs to be discharged from the middle of the mandrel. A cutter is added to the rolling die to complete the rolling and slitting at one time.

[0063] A straight pipe processing method based on the above-mentioned pipe making mold is characterized by:

[0064] The following steps are involved:

[0065] S1. Select a sheet of a certain width 25, use a conveying structure to convey it into the feed end, and enter the punching assembly position, the guide assembly position, the curling assembly position and the cutting assembly position in sequence;

[0066] S2. The punching punch and the cutting punch of the punching assembly complete the punching of the sheet and the positioning of the intermediate spacer; the punching of the sheet and the positioning of the intermediate spacer and the continuous material 252 are formed;

[0067] The punching positioning of the plate is completed by the guiding component;

[0068] The perforated sheet material is rolled in sections by the rolling assembly;

[0069] The cutting assembly completes the final slitting of the coiled material;

[0070] The work of each component is completed by the upper and lower mold assembly moving up and down at one time, completing the punching, cutting, guiding, curling and cutting processes at one time;

[0071] The discharge end outputs a tubular automobile muffler exhaust straight pipe 251 with holes;

[0072] Output in a continuous delivery manner.

[0073] For example, if there are step requirements on some pipe fittings, the continuous mold can first produce them in a straight tube state, and then use the expansion or shrinking process to achieve the forming of the pipe step. Therefore, the continuous mold can still be used for continuous pipe production and processing.

[0074] Specific work process:

[0075] During the return stroke of the punching machine, the upper die assembly moves upward, and the raw material continues to move forward along the machine body 1. When the raw material runs to the punching assembly 11, the first and third holes in the raw material coincide with the guide pin 5, and then the punching machine is turned on. The punching machine drives the guide pin 5 of the upper die assembly downward to enter the punching hole to detect the feeding step length. At the same time, the punching assembly repeats its work to perform punching operations on the raw material and remove waste materials. At this time, the guide assembly can obtain a semi-finished sheet of the required length of the pipe fitting product, and the connecting material belt is retained in the middle of the semi-finished sheet to assist the feeding of the semi-finished sheet;

[0076] During operation, the upper die assembly moves downward, the upper die seat contacts the raw material, the support block 10 holds up the raw material, the upper die moves downward, and under the action of the round core rod 6, the semi-finished material is attached to the round core rod 6 to form an inverted U-shaped structure. During the deformation process of the semi-finished material, both ends of the material press down the support block 10, the support block 10 rotates around the fixing pin of the support block 10, and then the support block 10 compresses the ejector pin 15, and the ejector pin 15 compresses the spring until the semi-finished material is separated from the support block 10, and the upper die continues to move downward, so that the support block 10 is further pressed downward by the upper die, until the upper die, together with the round core rod 6 and the inverted semi-finished material, enters the cavity of the lower concave die 16, thereby realizing the curling process of the semi-finished material;

[0077] The upper die seat and the round core rod 6 are reset, and the rolled product is taken out from the round core rod 6. Under the action of the ejector pin 15 and the spring, the support block 10 rotates in the opposite direction and bounces up to achieve reset. Then the next semi-finished product enters the rolling component 13, and the above actions are repeated to achieve the rolling process again.

[0078] When the pipe product moves into the cutting assembly 14, the upper die of the upper die assembly moves downward, and the semicircular upper recess 142 of the upper die assembly fits the cutting mandrel 31 and the pipe product attached to the mandrel and continues to move downward until it fits the lower recess 161. The spring of the semicircular upper recess 142 begins to compress, and the thickness space of the semicircular upper recess 142 begins to shrink.

[0079] Continuing downward, the inclined wedge 30 contacts the slider 28 that comes with the upper die downward, and the slider 28 is pushed to the right by the inclined wedge 30 under the action of the support plate 29. The slider spring 34 contracts and pushes the side push block 27 to move to the right. The side push block 27 contacts the slitting knife 26 installed in the semicircular upper recess 142 during the rightward movement, and the slitting knife 26 moves downward under the action of the bevel. The slitting knife 26 passes through the semicircular upper recess 142 and extends to the bottom, and cuts off the position of the pipe product connected with the cutting mandrel 31. Then the upper die assembly returns, and the slitting knife 26 is separated from the cutting mandrel 31. The spring of the semicircular upper recess 142 restores the increased thickness space again, so that the slitting knife 26 returns to the inside of the through hole of the semicircular upper recess 142, and the inclined wedge 30 and the slider 28 are reset at the same time. The formed automobile muffler exhaust straight pipe is discharged.

[0080] At the same time, the waste material is pushed into the waste material groove in the cutting mandrel 31, and the waste material groove is provided with an air hole. The compressed air connected to the outside is introduced into the air hole to blow the waste material falling in the waste material groove out of the mandrel.

[0081] The beneficial effects of the present invention are: the device can realize the upper and lower movements of the upper die assembly and the lower die assembly at one time, and complete the punching, cutting, guiding, curling, and cutting processes at one time; the continuous plate material is directly processed by connection, and finally a straight pipe-shaped automobile muffler exhaust straight pipe is formed for discharge, which has the advantages of high processing efficiency and low cost, and can realize the continuous molding and stamping production of straight pipe parts, and combine various processes and characteristics on a set of continuous dies to realize the function of continuous stamping production of inner tube curling. Thereby achieving the purpose of reducing the production costs generated by production processes and human resources and improving benefits.

[0082] The processing method based on the mold is simple and practical.

[0083] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0085] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A continuous molding die for automobile muffler exhaust straight pipes, comprising an upper mold assembly and a lower mold assembly on a machine body (1), characterized in that: The machine body (1) is provided with a punching assembly (11), a guiding assembly (12), a curling assembly (13) and a cutting assembly (14) in sequence from the feeding end to the discharging end. The punching assembly (11), the curling assembly (13) and the cutting assembly (14) are arranged in sequence based on the upper die assembly and the lower die assembly. The punching, curling and cutting processes are completed once the upper die assembly and the lower die assembly move up and down. The lower die assembly comprises a lower support plate (17), a pad (18) and a lower die seat (19). A plurality of pads (18) are fixedly mounted on the upper surface of the lower support plate (17). The lower die seat (19) is fixedly mounted on the top of the pad (18). A lower pad (23) is fixedly mounted above the lower die seat (19) at positions corresponding to the punching assembly, the guiding assembly and the curling assembly. The upper die assembly comprises an upper die seat (20) and an upper pad (21); the upper pad (21) is installed on the lower surface of the upper die seat (20) at positions corresponding to the punching assembly, the guide assembly and the curling assembly; The cutting assembly (14) comprises a cutting mechanism (7), a cylindrical fixing structure and a cutting mandrel (31); The slitting mechanism (7) comprises a slitting knife (26), a side push block (27), a slider (28), a backing plate (29) and an inclined wedge (30), wherein the backing plate (29) is fixedly mounted on the upper die base (20), a sliding groove is transversely arranged on one side of the upper die base (20) corresponding to the backing plate (29), the sliding groove is provided with the slider (28), the middle side end of the slider (28) is fixedly connected to the side push block (27), the slider (28) is connected to a slider spring (34) in the sliding groove, and the inclined wedge (30) is arranged on the lower die base (19) directly below the slider (28), and the slider (28) is pushed to move to the right by the inclined wedge (30); The circular tubular fixed structure comprises a semicircular upper recess (142) fixedly connected to the upper die seat (20), and a semicircular lower recess (161) fixedly connected to the lower die seat (19); a telescopic spring (36) is provided in the middle of the semicircular upper recess (142); the telescopic spring (36) is used to achieve spatial variation in the thickness of the semicircular upper recess (142) from top to bottom; a transverse through hole is provided at the position corresponding to the side push block (27); and a longitudinal through hole communicating with the transverse through hole is provided at the longitudinal through hole; the slitting knife (26) is provided in the longitudinal through hole; the slitting knife (26) is driven by the movement of the side push block (27) to move up and down; The guide assembly (12) comprises a guide pin (5), and the guide pin (5) is fixedly mounted on a lower pad (23) of the lower die assembly; The rolling component (13) comprises a round core rod (6), an upper concave die (141) and a lower concave die (16) corresponding to the upper and lower semicircles, the upper concave die (141) and the lower concave die (16) being respectively arranged on an upper pad (21) of an upper die component and a lower pad (23) of a lower die component at positions corresponding to the rolling component (13), and the round core rod (6) being arranged between the upper concave die (141) and the lower concave die (16); The cutting mandrel (31) is an extension of the round mandrel (6), and is provided with a cutout hole (33) at a position directly below the corresponding slitting knife (26).

2. The automobile muffler exhaust straight pipe continuous molding die according to claim 1 is characterized in that: The punching assembly (11) comprises a punching punch (3) and a cutting punch (4), wherein the punching punch (3) and the cutting punch (4) are respectively fixedly mounted on an upper die base (20), and the punching assembly (11) further comprises a floating block (2), wherein the floating block (2) is fixedly mounted on a lower pad (23), and a stripping plate (22) is provided on the upper die assembly corresponding to the floating block (2), wherein the stripping plate (22) is fixedly mounted below the upper pad (21); There are two cutting punches (4), which are respectively arranged at the two ends of the central axis of the plate, and a spacing position is provided between the two cutting punches (4).

3. The automobile muffler exhaust straight pipe continuous molding die according to claim 2 is characterized in that: Floating mechanisms for supporting the sheet material are provided on both sides of the corresponding rolling assembly (13). The floating mechanisms on both sides include a support column (8), a positioning pin (9), a support block (10), and an ejector pin (15). The ejector pin is a spring-loaded retractable ejector pin. One end of the support block (10) is hinged to the support column (8) via an axle pin, and the middle end is connected to the top of the ejector pin. The positioning pin (9) is fixedly connected to the support column (8) and is arranged directly above the support block (10) when the support column (8) is in a horizontal state. The ejector pin is fixedly connected to the lower pad (23) via a spring. The ejector pin (15) drives one end of the support block (10) to move up and down along the axle pin through spring compression. The support column (8) is fixedly mounted on the lower pad (23) via bolts.

4. The automobile muffler exhaust straight pipe continuous molding die according to claim 3 is characterized in that: The cutting mandrel (31) is provided with a waste groove (32), and the slitting knife (26) passes through the semicircular upper recess (142) and extends to the bottom to cut off the position where the pipe product is connected with the cutting mandrel (31), and pushes the waste into the waste groove (32) in the cutting mandrel (31).

5. A method for processing a continuous molding pipe mold for an automobile muffler exhaust straight pipe according to any one of claims 1 to 3, characterized in that: The following steps are involved: Select a certain width of plate, use the conveying structure to convey it to the feeding end, and then enter the punching assembly position, the guiding assembly position, the rolling assembly position and the cutting assembly position in sequence; The punching punch and cutting punch of the punching assembly complete the punching of the plate and the positioning, cutting and connecting of the intermediate strip intervals; The punching positioning of the plate is completed by the guiding assembly; The perforated sheet material is rolled in sections by the rolling assembly; The cutting assembly completes the final slitting of the coiled material.

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