CN113427787A - Fluid transmission component and manufacturing method thereof - Google Patents

Fluid transmission component and manufacturing method thereof Download PDF

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Publication number
CN113427787A
CN113427787A CN202110890262.XA CN202110890262A CN113427787A CN 113427787 A CN113427787 A CN 113427787A CN 202110890262 A CN202110890262 A CN 202110890262A CN 113427787 A CN113427787 A CN 113427787A
Authority
CN
China
Prior art keywords
fluid transfer
transfer member
manufacturing
pipe
shaped pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110890262.XA
Other languages
Chinese (zh)
Inventor
梁其锦
张红帅
王夏忠
于坤
李圣明
张瑞
李洋赞
严青
张玉国
李雪娜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Chinaust Automotive Plastics Corp ltd
Original Assignee
Shanghai Chinaust Automotive Plastics Corp ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Chinaust Automotive Plastics Corp ltd filed Critical Shanghai Chinaust Automotive Plastics Corp ltd
Priority to CN202110890262.XA priority Critical patent/CN113427787A/en
Publication of CN113427787A publication Critical patent/CN113427787A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0065—Heat treatment
    • B29C63/0069—Heat treatment of tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/26—Lining or sheathing of internal surfaces
    • B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0029—Cold deforming of thermoplastics material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/14—Joints for pipes of different diameters or cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Abstract

The application discloses a fluid transmission component and a manufacturing method thereof, wherein the manufacturing method of the fluid transmission component comprises the following steps: s1; preheating a circular tube to a softening temperature; s2; after the round tube is softened, internally sleeving a protective lining core with a round section shape on the softened round tube; s3; extruding said circular tube with said protective core therein through a preformed die to form said circular tube into a fluid transfer member; s4; cooling the fluid transfer member for a predetermined time.

Description

Fluid transmission component and manufacturing method thereof
Technical Field
The present invention relates to a fluid transfer system, and more particularly to a fluid transfer member and a method of making the same.
Background
With the continuous advancement of technology, there is a need in many fields for a piping structure that can direct a fluid from one location to another. However, in some machine facilities or some devices, the restriction on the space requirement is high, the space left for arranging the pipes is quite narrow, and the space for arranging the pipes may be irregular. Most of the tubes used to conduct fluids are circular in cross-sectional shape. If such a pipe member having a circular cross-sectional shape is disposed in such an environment having a high space requirement, there is a high possibility that the piping cannot be installed in such a space due to a space limitation for disposing the piping.
Because the fluid has a high requirement on the sealing degree when passing through the pipeline and the connecting joint, in order to ensure that the pipeline and the connecting joint have good sealing property and can be well fixed with each other, the existing pipeline adopts a pipe with a circular cross section because the end part of the pipe with the circular cross section has high symmetry degree.
However, once the cross-sectional shape of the conduit is not circular, it presents not only challenges in the fabrication of the pipe, but also difficulties in the connection between the pipe and the pipe. More importantly, if the end of the pipe is irregular in shape, the sealing effect of the pipe and the coupling joint is affected.
In addition, the section shape of the pipeline is gradually changed from a regular circle to an irregular shape, the tooling die with the circular section is not suitable any more, and even the forming mechanism is changed correspondingly, because in the whole forming process, the circular pipe with the circular section needs the whole 360-degree space to be balanced by adsorption force, the circular pipe can be shaped, the adsorption force required by each point of the special-shaped pipe is different, the forming mechanism of the circular pipe only can damage the shape of the special-shaped pipe, therefore, when the section shape of the pipeline is irregular, the forming mechanism of the pipeline is changed, and the traditional extrusion process is not suitable any more.
Disclosure of Invention
It is an advantage of the present invention to provide a fluid transfer member and method of making the same, wherein the fluid transfer member fabrication method can be adapted to fabricate tubes having non-circular cross-sections.
To achieve at least one of the above advantages, the present invention provides a method for manufacturing a fluid transfer member, comprising the steps of:
s1; preheating a circular tube to a softening temperature;
s2; after the round tube is softened, internally sleeving a protective lining core with a round section shape on the softened round tube;
s3; extruding said circular tube with said protective core therein through a preformed die to form said circular tube into a fluid transfer member;
s4; cooling the fluid transfer member for a predetermined time.
According to an embodiment of the invention, in the step S1, the round tube is preheated to 70 to 150 ℃ for 10 to 30 min. .
According to an embodiment of the present invention, after the step S3 and before the step S4, the method of manufacturing the fluid transfer member further includes the steps of:
s5; and continuously heating the extruded circular pipe sleeved with the lining core to a preset temperature, and keeping the temperature for a preset time to wait for the circular pipe sleeved with the lining core to be thermoformed.
According to an embodiment of the present invention, in the step S5, the heating temperature is 140 to 200 ℃, and the holding time is 10 to 35 min.
According to an embodiment of the present invention, the method of manufacturing the fluid transfer member further comprises the steps of:
s6; and pulling out the lining core.
According to an embodiment of the present invention, the method of manufacturing the fluid transfer member includes a special pipe, wherein the special pipe has a special pipe portion having at least a part of a non-circular cross-sectional shape.
According to an embodiment of the present invention, a direction in which a longest straight line passing through a center of a sectional view in the sectional view of the shaped pipe portion is located defines a width direction, a direction perpendicular to the width direction in the sectional view of the shaped pipe portion defines a height direction, and a maximum width of the shaped pipe portion in the width direction is larger than or equal to a maximum height of the shaped pipe portion in the height direction.
According to an embodiment of the present invention, the pipe profile has at least one extending pipe portion, and the extending directions of the pipe profile and the extending pipe portion of the pipe profile are collinear.
According to an embodiment of the present invention, the pipe profile has at least one extending pipe portion, and the extending directions of the pipe profile and the extending pipe portion of the pipe profile are not collinear.
According to an embodiment of the present invention, the cross-sectional shape of the extension pipe portion is a circular shape or a cross-sectional shape formed by a bellows.
Drawings
FIG. 1A illustrates a perspective view of one embodiment of a fluid transport member of the present invention.
Fig. 1B shows a perspective view of a second embodiment of a fluid transfer member according to the present invention.
Fig. 1C shows a perspective view of a third embodiment of a fluid transfer member according to the present invention.
Fig. 1D shows a cross-sectional view of a fourth embodiment of a fluid transfer member according to the present invention.
Fig. 2A shows a perspective view of the fluid transfer member of the present invention including a third embodiment.
Fig. 2B shows a perspective view of a second embodiment of a fluid transfer member incorporating a third embodiment of the present invention.
Fig. 3 shows an exploded view of a second embodiment of the fluid transfer member of the present invention.
Fig. 4 shows a flow chart of a method of making a fluid transport member according to the present invention.
Detailed Description
The following examples are given by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1A to 3, a fluid transfer member for a vehicle according to a preferred embodiment of the present invention will be described in detail below, wherein the fluid transfer member for a vehicle includes at least one profiled pipe 10. The cross-sectional shape of at least a part of the special pipe 10 is implemented as a non-circular special pipe portion. The profile tube 10 forms a flow guiding channel 101.
The shaped tube portion 11 is integrally formed by integral molding. As shown in fig. 1B, the sectional shape of the shaped pipe portion 11 is implemented as an ellipse. The sectional shape of the modified tube portion 11 may also be implemented as a shape formed by two U-shaped butt joints as shown in fig. 1C or a shape in which four right-angled portions of a rectangle have chamfers as shown in fig. 1D.
For example, the shaped tube portion 11 may have a sectional shape implemented as an ellipse, a sectional shape implemented as a shape formed by two U-shaped butt joints as shown in fig. 1C, and a sectional shape with chamfers at the corners of a rectangle as shown in fig. 1D.
The direction in which the longest straight line passing through the center of the sectional view in the sectional view of the shaped tube portion 11 is located defines a width direction X, and the direction perpendicular to the width direction X in the sectional view of the shaped tube portion 11 defines a height direction Y. The maximum width of the shaped pipe portion 11 in the width direction X is larger than the maximum height of the shaped pipe portion 11 in the height direction Y.
With such a design, when the space where the piping is arranged is irregular, it is possible to make the special pipe 10 be installed in the space where the piping is arranged by adjusting the spatial position of the special pipe 10 in the space.
The special pipe 10 further has at least one extension pipe portion 12, wherein the special pipe portion 11 and the extension pipe portion 12 together form the guide passage 101. In one embodiment, the extension tube portion 12 is implemented as a circular tube portion, wherein the cross-sectional shape of the circular tube portion is circular. The extension pipe portion 12 may also be implemented as a bellows such that the sectional shape of the extension pipe portion 12 is implemented as a shape formed by the section of the bellows. The special-shaped pipe part 11 and the round pipe part jointly define the flow guide channel 101 for communicating with other pipe bodies.
Preferably, the extension directions of the shaped pipe portion 11 and the extension pipe portion 12 of the shaped pipe 10 are collinear. In one embodiment, the extension directions of the shaped pipe portion 11 and the extension pipe portion 12 of the shaped pipe 10 are not collinear. This makes it possible to selectively install the profile tube 10 in an environment where there is a limit to the piping arrangement space, depending on the cross-sectional width and the cross-sectional height of the profile tube 10.
In a modified embodiment, the cross-sectional shape of the extension pipe portion 12 of the special pipe 10 is a non-circular shape different from the cross-sectional shape of the special pipe portion 11. For example, the cross-sectional shape of the extension pipe portion 12 is implemented as one of an oval shape, a shape in which two U-shapes are butted as shown in fig. 1C, and the like.
Referring to fig. 2A, 2B and 3, further, the fluid delivery system for a vehicle further includes at least one pipe connector 20, the pipe connector 20 having a shaped pipe interface 21 and a pipe body interface 22, the shaped pipe interface 21 forming an interface channel 2101. The tube body interface 22 forms a diversion channel 2201, wherein the diversion channel 2201 is communicated with the interface channel 2101. The shaped pipe abutting portion 21 of the shaped pipe abutting portion 21 is sealably abutted to the shaped pipe portion 11 of the shaped pipe 10 so that the abutting passage 2101 is sealingly communicated with the flow guide passage 101 of the shaped pipe 10.
It is worth mentioning that the cross-sectional shape of the interface channel 2101 of the profile tube interface 21 is arranged similar to the cross-sectional shape of the flow guide channel 101 of the profile tube 10. Preferably, the cross-sectional size of the docking channel 2101 is slightly larger than the cross-sectional size of the flow guide channel 101 of the profile tube 10, so that when the profile tube 10 is connected to the pipe connector 20, the end of the profile tube 10 can be inserted into the docking channel 2101 of the profile tube docking portion 21 by means of cold-plugging, thereby achieving a sealed connection with the pipe connector 20. Of course, in one embodiment, the cross-sectional dimension of the docking channel 2101 is slightly smaller than the cross-sectional dimension of the channel of the profile tube 10 to enable the tube connector 20 to be inserted into the channel of the profile tube 10 to dock the tube connector 20 with the profile tube 10.
Preferably, the profile tube 10 is embodied in a plastic material. More preferably, the profile tube 10 is sealingly butted against the pipe joint 20 by welding. The pipe joint 20 is implemented to be made of a metal material or a plastic material.
In one embodiment, the shaped pipe portion 11 of the shaped pipe 10 is hermetically communicated with the shaped pipe abutting portion 21 of the pipe joint 20 by one selected from ultrasonic welding and laser welding, so that the passage of the shaped pipe 10 is hermetically communicated with the abutting passage 2101 of the shaped pipe abutting portion 21.
In one embodiment, the cross-sectional shape of the diversion channel 2201 of the pipe body interface 22 can also be implemented similar to the cross-sectional shape of the profile pipe 10. With this arrangement, the pipe joint 20 will be able to be used to connect two of the profile pipes 10.
In another embodiment, the cross-sectional shape of the diversion channel 2201 of the pipe body docking portion 22 is also implemented as a circle, so that the profile pipe 10 can be docked with a round pipe with a circular cross-sectional shape through the pipe joint 20. In other words, the pipe joint 20 can be used to butt two different types of pipes. Thus, when limited by the installation space, fluid can be conducted by using the profile tube 10, and when not limited by the space, fluid can be conducted through the pipe joint 20 and the round tube.
It is worth mentioning that the angle between the extension direction of the docking channel 2101 and the extension direction of the diverting channel 2201 is set to be greater than 0 degrees and less than or equal to 180 degrees, so that the pipe connector 20 can be used to connect the special pipe 10 with other pipes in different directions.
It should also be noted that, when the cross-sectional shape of the diversion channel 2201 of the pipe body docking portion 22 is also implemented as a circle, the outer wall of the pipe body docking portion 22 is provided with a plug structure so that the pipe body docking portion 22 can be connected to other pipe bodies by plug connection. For example, the outer wall of the pipe body abutting part 22 may be provided with annular protrusions at intervals to form the bamboo-like insertion structure, so that the pipe body abutting part 22 can be oppositely abutted with other deformable plastic pipes in an insertion manner.
Preferably, an angle between an extending direction of the docking channel 2101 and an extending direction of the diverting channel 2201 is set to 90 degrees. With such a design, the pipe connector 20 can butt the special pipe 10 against another pipe body whose extending direction is 90 degrees to the special pipe 10, so that the flowing direction of the fluid is changed.
Referring to fig. 4, according to another aspect of the present invention, there is also provided a method of manufacturing a fluid transfer member, comprising the steps of:
s1; preheating a circular tube to a softening temperature;
s2; after the round tube is softened, internally sleeving a protective lining core with a round section shape on the softened round tube;
s3; extruding said circular tube with said protective core therein through a preformed die to form said circular tube into a fluid transfer member;
s4; cooling the fluid transfer member for a predetermined time.
Preferably, in the step S1, the round tube is preheated to 70 to 150 ℃ for 10 to 30 min. It is worth mentioning that if the preheating temperature and time are not sufficient, the round tube may crack and fail to be pressed in place during the subsequent pressing of the round tube by the press die.
Further, the preformed die may be capable of forming an extrusion channel that matches the fluid transport member formation, wherein the extrusion channel is non-circular in cross-sectional shape.
After the step S3 and before the step S4, the method of making the fluid transfer member further comprises the steps of:
s5; and continuously heating the extruded circular pipe sleeved with the lining core to a preset temperature, and keeping the temperature for a preset time to wait for the circular pipe sleeved with the lining core to be thermoformed. Preferably, in the step S5, the heating temperature is 140 to 200 ℃, and the holding time is 10 to 35min, so that the round tube can be deformed after being softened. If the heating time or temperature is not reached, the external dimension of the flat pipe cannot reach the required dimension, or the flat pipe can continuously recover the original shape before being flattened and change in trend, namely rebound.
It is worth mentioning that the method for manufacturing the fluid transfer member further comprises the following steps:
s6; and pulling out the lining core.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (10)

1. A method of making a fluid transport member, comprising the steps of:
s1; preheating a circular tube to a softening temperature;
s2; after the round tube is softened, internally sleeving a protective lining core with a round section shape on the softened round tube;
s3; extruding said circular tube with said protective core therein through a preformed die to form said circular tube into a fluid transfer member;
s4; cooling the fluid transfer member for a predetermined time.
2. The method of manufacturing a fluid transmission member according to claim 1, wherein in the step S1, the round tube is preheated to 70 to 150 ℃ for 10 to 30 min. .
3. The method of manufacturing a fluid transfer member of claim 1, wherein after the step S3 and before the step S4, the method of manufacturing a fluid transfer member further comprises the steps of:
s5; and continuously heating the extruded circular pipe sleeved with the lining core to a preset temperature, and keeping the temperature for a preset time to wait for the circular pipe sleeved with the lining core to be thermoformed.
4. The method of claim 3, wherein the heating is performed at 140-200 ℃ for 10-35 min in step S5.
5. The method of manufacturing a fluid transfer member of claims 1 to 4, further comprising the steps of:
s6; and pulling out the lining core.
6. The method of manufacturing a fluid transfer member according to claims 1 to 4, wherein the method of manufacturing a fluid transfer member includes a shaped pipe having a non-circular shaped pipe portion at least a part of which is in a cross-sectional shape.
7. The method of manufacturing a fluid transfer member according to claim 6, wherein a direction in which a longest straight line passing through a center of a sectional view in the sectional view of the shaped pipe portion is located defines a width direction, a direction perpendicular to the width direction in the sectional view of the shaped pipe portion defines a height direction, and a maximum width of the shaped pipe portion in the width direction is greater than or equal to a maximum height of the shaped pipe portion in the height direction.
8. The method of manufacturing a fluid transfer member according to claim 6, wherein the shaped pipe has at least one extended pipe portion, and the extending direction of the shaped portion and the extended pipe portion of the shaped pipe are collinear.
9. The method of manufacturing a fluid transfer member according to claim 6, wherein the shaped pipe has at least one extended pipe portion, and the extending directions of the shaped portion and the extended pipe portion of the shaped pipe are not collinear.
10. A fluid transfer member made by the method of making any one of the fluid transfer members 1-9.
CN202110890262.XA 2021-08-04 2021-08-04 Fluid transmission component and manufacturing method thereof Pending CN113427787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110890262.XA CN113427787A (en) 2021-08-04 2021-08-04 Fluid transmission component and manufacturing method thereof

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Application Number Priority Date Filing Date Title
CN202110890262.XA CN113427787A (en) 2021-08-04 2021-08-04 Fluid transmission component and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN113427787A true CN113427787A (en) 2021-09-24

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Application Number Title Priority Date Filing Date
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855336A (en) * 2016-04-01 2016-08-17 武汉理工大学 Thermal forming method for aluminum alloy car-body special-shaped variable-section pipe structural members
CN110509532A (en) * 2019-06-17 2019-11-29 长春亚大汽车零件制造有限公司 A kind of nylon tube flattens molding machine and flattens forming method
CN111451309A (en) * 2020-04-15 2020-07-28 钢铁研究总院 Hot extrusion die for special-shaped square pipe and hot extrusion integral forming method
CN111633964A (en) * 2020-06-11 2020-09-08 东华大学 Forming device and forming method for thermoplastic special-shaped pipe
CN213082279U (en) * 2020-07-28 2021-04-30 大连联合高分子材料有限公司 Heat-shrinkable tube with oval cross section formed by extrusion and extrusion machine head die thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855336A (en) * 2016-04-01 2016-08-17 武汉理工大学 Thermal forming method for aluminum alloy car-body special-shaped variable-section pipe structural members
CN110509532A (en) * 2019-06-17 2019-11-29 长春亚大汽车零件制造有限公司 A kind of nylon tube flattens molding machine and flattens forming method
CN111451309A (en) * 2020-04-15 2020-07-28 钢铁研究总院 Hot extrusion die for special-shaped square pipe and hot extrusion integral forming method
CN111633964A (en) * 2020-06-11 2020-09-08 东华大学 Forming device and forming method for thermoplastic special-shaped pipe
CN213082279U (en) * 2020-07-28 2021-04-30 大连联合高分子材料有限公司 Heat-shrinkable tube with oval cross section formed by extrusion and extrusion machine head die thereof

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