CN110756631B - Elbow core mold for elbow with variable section perimeter and elbow device - Google Patents

Elbow core mold for elbow with variable section perimeter and elbow device Download PDF

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Publication number
CN110756631B
CN110756631B CN201911152269.0A CN201911152269A CN110756631B CN 110756631 B CN110756631 B CN 110756631B CN 201911152269 A CN201911152269 A CN 201911152269A CN 110756631 B CN110756631 B CN 110756631B
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Prior art keywords
mandrel
elbow
core
pipe
balls
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CN110756631A (en
Inventor
童军
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Baolong Anhui Auto Parts Co ltd
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Baolong Anhui Auto Parts Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00Bending tubes using mandrels or the like
    • B21D9/01Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • B21D9/03Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00Bending tubes using mandrels or the like
    • B21D9/16Auxiliary equipment, e.g. machines for filling tubes with sand

Abstract

The invention discloses a bent pipe core mould for a bent pipe with a variable section perimeter, which comprises a core rod for supporting a thick pipe section and a plurality of core balls for supporting the bent pipe section, wherein the first core ball is connected with one end of the core rod, the other core balls are sequentially connected in the direction far away from the core rod, and two adjacent core balls are hinged through a hinge shaft arranged along the radial direction of the core rod. Through the elbow core mold with the optimized design, in the process of bending the pipe, the pipe wall is supported in the pipe body, and the core balls rotate in sequence along with the bending of the pipe body, so that the pipe wall is attached to the core ball, and the pipe wall is well supported. The invention also discloses a pipe bending device for bending the pipe with the variable section perimeter.

Description

Elbow core mold for elbow with variable section perimeter and elbow device
Technical Field
The invention relates to the technical field of pipe fitting processing, in particular to a bent pipe core mold and a bent pipe device for a bent pipe with a variable section perimeter.
Background
The high strength, light weight, high safety and high cost performance of parts are urgent needs of the rapid development of the automobile industry at present, and the light weight structure and the flexibility of processing technology are one of the general trends of the development of modern advanced manufacturing technology. More and more products welded by a plurality of sheet metal parts are changed into closed pipe fittings with complex single-piece sections. Due to the limitation of the automobile installation space environment, the pipe fitting structure is more and more complex, the reducing bent pipe and even the pipe fittings with different sections need to be processed, the processing of the pipe fittings is difficult, and the processing quality and the processing precision are particularly critical.
In the machining of the reducing elbow pipe requiring bending at the reducing position, because the reducing section between the large pipe diameter and the small pipe diameter of the pipe fitting has a bend and the reducing position has an oval cross section, when the pipe fitting after reducing is bent, because the bend angle is located at the reducing position, the pipe wall is easily affected by the surface stress of the pipe fitting, and the pipe wall has the defects of folds, collapse and the like during bending, the core mold needs to be inserted into the pipe body during bending, and the inner support is performed at the bending position. However, the conventional core rod adopts a rigid structural member of an integral structure, so that the core rod is poor in fitting property with a pipe wall during pipe bending and cannot achieve a supporting effect, and the pipe fitting is difficult to demould from the inside of the bent pipe after being bent, so that the size of the pipe fitting in the pipe bending process is unstable, the quality is uncontrollable, and the mass production cannot be met.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides a pipe bending core mold and a pipe bending device for bending a pipe with a variable section perimeter.
The elbow mandrel comprises a thin pipe section, an elbow section and a thick pipe section, the elbow mandrel comprises a mandrel for supporting the thick pipe section and a plurality of mandrel balls for supporting the elbow section, the first mandrel ball is connected with one end of the mandrel, the other mandrel balls are sequentially connected in the direction far away from the mandrel, and two adjacent mandrel balls are hinged through a hinge shaft arranged along the radial direction of the mandrel.
Preferably, the outer wall of the core ball is provided with an annular supporting surface arranged around the extension direction of the core rod, and the annular supporting surface is an elliptic cylindrical surface with the long axis arranged parallel to the hinge shaft.
Preferably, the core balls have the same minor axis length and the major axis length gradually decreases in a direction away from the core rod, and the core rod has a circular cross section and a diameter equal to the major axis of the adjacent core ball.
Preferably, the distance between the annular support surfaces of two adjacent core balls is gradually reduced.
Preferably, an elastic supporting piece is arranged between two adjacent core balls, and two ends of the elastic supporting piece are respectively connected with the two adjacent core balls.
Preferably, the elastic support member includes a plurality of elastic bodies respectively located at both sides of the hinge shaft.
Preferably, the positioning core is used for supporting the thin pipe section, and the positioning core is positioned on one side, away from the core rod, of all the core balls and is connected with the last core ball.
Preferably, the outer wall of the core ball is provided with an annular support surface arranged around the extension direction of the core rod, the annular support surface is an elliptic cylindrical surface with a long axis arranged parallel to the hinge axis, and the positioning core has a circular cross section and a diameter equal to the length of a short axis of an adjacent core ball.
According to the elbow mandrel for the elbow with the variable cross-section perimeter, the elbow mandrel comprises a mandrel and a plurality of mandrel balls, the mandrel is used for supporting the thick pipe section, the mandrel is used for supporting the elbow section, the first mandrel ball is connected with one end of the mandrel, other mandrel balls are sequentially connected in the direction away from the mandrel, and two adjacent mandrel balls are hinged through a hinge shaft arranged along the radial direction of the mandrel. Through the elbow core mold with the optimized design, in the process of bending the pipe, the pipe wall is supported in the pipe body, and the core balls rotate in sequence along with the bending of the pipe body, so that the pipe wall is attached to the core ball, and the pipe wall is well supported.
The invention also provides a pipe bending device for bending the pipe with the variable cross-section perimeter, which comprises the pipe bending mandrel.
Preferably, the pipe bending machine further comprises a die pushing driving mechanism, wherein the die pushing driving mechanism is connected with the core rod and used for pushing the pipe bending die to feed towards the core ball direction during pipe bending.
In the present invention, the technical effect of the proposed elbow device for bending the elbow with the variable cross-section perimeter is similar to that of the elbow mandrel, and therefore, the description is omitted.
Drawings
Fig. 1 is a schematic structural diagram of a curved pipe with a variable cross-section and a variable circumference according to the present invention.
FIG. 2 is a schematic representation of a configuration of an elbow mandrel for a variable cross-sectional circumference elbow according to the present invention.
FIG. 3 is another schematic diagram of an alternative construction of an elbow mandrel for a variable cross-sectional circumference elbow according to the present invention.
FIG. 4 is a schematic diagram of a single core ball of an elbow mandrel for a variable cross-sectional circumference elbow according to the present invention.
FIG. 5 is a schematic view of a bend mandrel bend according to the present invention for use with bends having varying cross-sectional perimeters.
Fig. 6 is a schematic structural diagram of a pipe bending apparatus for a pipe bending with a variable cross-sectional circumference according to the present invention.
Detailed Description
Fig. 1 to 6 are schematic structural views of a cross-sectional circumference-variable elbow according to the present invention, fig. 1 is a schematic structural view of an elbow mandrel for a cross-sectional circumference-variable elbow according to the present invention, fig. 2 is a schematic structural view of an elbow mandrel for a cross-sectional circumference-variable elbow according to the present invention, fig. 3 is a schematic structural view of another elbow mandrel for a cross-sectional circumference-variable elbow according to the present invention, fig. 4 is a schematic structural view of a single core ball of an elbow mandrel for a cross-sectional circumference-variable elbow according to the present invention, fig. 5 is a schematic structural view of an elbow mandrel for a cross-sectional circumference-variable elbow according to the present invention, and fig. 6 is a schematic structural view of an elbow apparatus for a cross-sectional circumference-variable elbow according to the present invention.
Referring to fig. 2 to 5, the present invention provides a core mold for a curved pipe with a variable cross-sectional circumference, the curved pipe with a variable cross-sectional circumference includes a thin pipe segment 101, a curved pipe segment 102 and a thick pipe segment 103, wherein the core mold includes a core rod 21 for supporting the thick pipe segment 103 and a plurality of core balls 22 for supporting the curved pipe segment 102, a first core ball 22 is connected to one end of the core rod 21, and the other core balls 22 are sequentially connected in a direction away from the core rod 21, and two adjacent core balls 22 are hinged by a hinge shaft disposed in a radial direction of the core rod 21.
To describe in detail the specific operation of the elbow plug for an elbow with a varying cross-sectional perimeter length according to this embodiment, the present embodiment also proposes an elbow device including the elbow plug described above with reference to fig. 6.
In a specific design manner of the tube bending device of this embodiment, the tube bending device further includes a die pushing driving mechanism, and the die pushing driving mechanism is connected to the core rod 21 and used for pushing the tube bending die to feed toward the core ball 22 during tube bending.
In an embodiment of the elbow device of the present embodiment, the elbow device further includes: the device comprises a mounting seat, a turning assembly and a clamping assembly;
the bending component comprises a wheel die 41 and a clamping die 42, the wheel die 41 is rotatably mounted on the mounting seat through the rotating shaft, the side wall of the wheel die 41 is provided with a first clamping surface and a bent pipe forming surface which are circumferentially arranged, the clamping die 42 is mounted on the wheel die 41, the clamping die 42 is positioned on one side, away from the rotating shaft, of the first clamping surface, one side, facing the first clamping surface, of the clamping die 42 is provided with a second clamping surface matched with the first clamping surface, and the first clamping surface and the second clamping surface jointly enclose a first clamping cavity for clamping the thick pipe section 103;
the clamping assembly comprises a guide die 51, the guide die 51 is installed on the installation base 3 and located on one side of the clamping die 42, the guide die 51 is located on the elbow forming surface far away from one side of the rotating shaft and one side of the guide die 51 facing the elbow forming surface is provided with a pipe wall supporting surface.
In the specific pipe bending process of the pipe bending mandrel and the pipe bending device for bending pipes with variable cross-section and perimeter, the thin tube section of the expanded tube body is clamped by the first clamping surface and the second clamping surface on the wheel die and the clamping die, so that the bent pipe section is positioned at one side of the first clamping surface, which is close to the forming surface of the bent pipe, the front end of the core ball is inserted into the bent pipe section from one end of the thick pipe section, the articulated shaft is vertically arranged, the core rod is positioned in the thick pipe section, when the bent pipe is bent, the clamping die rotates along with the wheel die to drive the thin tube section to rotate, the guide die supports the outer wall of the bent tube section through the tube wall supporting surface to bend the bent tube section under the action of the bent tube forming surface, meanwhile, the mold pushing driving mechanism pushes the core mold to feed towards the direction of the thin pipe section from one end of the thick pipe section, the hinged structures of the core balls rotate along with the bending of the pipe fitting, the outer walls of the core balls are attached to the inner wall of the bent pipe section, and the side wall of the bent pipe section is well supported.
In this embodiment, a bending pipe core mold and a bending pipe apparatus for bending a pipe with a variable cross-sectional circumference are provided, the bending pipe core mold includes a mandrel for supporting the thick pipe section and a plurality of core balls for supporting the bent pipe section, a first core ball is connected to one end of the mandrel, and the other core balls are sequentially connected in a direction away from the mandrel, and two adjacent core balls are hinged by a hinge shaft disposed along a radial direction of the mandrel. Through the elbow mandrel and the elbow device which are optimally designed, in the process of elbow, the pipe wall is supported in the pipe body, and the mandrel balls rotate in sequence along with the bending of the pipe body, so that the pipe wall is ensured to be attached to the pipe wall, and the pipe wall is well supported.
Because the pipe diameter shape of the pipe body is changed in a flat shape in the pipe bending process, in order to improve the fit between the core ball and the inner wall of the pipe bending section in the pipe bending process, in the specific implementation mode of the core die, the outer wall of the core ball 22 is provided with an annular supporting surface which is arranged around the extension direction of the core rod 21, the annular supporting surface is an elliptic cylindrical surface with a long axis parallel to the hinge shaft, and the long axis of the core ball is vertically arranged in the supporting process.
In a more specific design, the core balls 22 have the same minor axis length and the major axis length gradually decreases in a direction away from the core rod 21, and the core rod 21 has a circular cross section and a diameter equal to the major axis of the adjacent core ball 22; in another embodiment, the distance between the annular bearing surfaces of two adjacent core balls 22 is gradually decreased. Due to the reducing structure of the elbow section, the supporting surfaces and the intervals of the core balls are optimally designed, so that the balance of the supporting force of different positions on the side wall of the elbow section is ensured, the possible damage caused by different surface stresses at different positions due to the reducing of the elbow section is made up, and the demolding of the core mold after the elbow is facilitated.
In order to ensure the matching and positioning precision of the core mold and the pipe body in the pipe bending process, in other specific embodiments, the pipe bending machine further comprises a positioning core 23 for supporting the thin pipe section 101, wherein the positioning core 23 is positioned on one side of all the core balls 22 away from the core rod 21 and is connected with the last core ball 22; during processing, the positioning core is inserted into the thin pipe section to realize positioning of the front end of the bent pipe section, so that relative displacement between the core ball and the pipe wall of the bent pipe section is prevented during pipe bending, and the supporting effect of each core ball on the corresponding pipe wall is ensured.
In a specific design of the positioning core, the outer wall of the core ball 22 is provided with an annular supporting surface arranged around the extension direction of the core rod 21, the annular supporting surface is an elliptic cylindrical surface with a long axis arranged parallel to the hinge axis, and the positioning core 23 has a circular cross section and a diameter equal to the length of a short axis of the adjacent core ball 22, so that the core die is conveniently released from the pipe body after the bending is finished.
In other specific design manners, an elastic supporting member is arranged between two adjacent core balls 22, and two ends of the elastic supporting member are respectively connected with the two adjacent core balls 22; the supporting spring realizes reverse elastic support for rotation between adjacent core balls during bending, and the annular supporting surface provides stable support for the pipe wall of the bent pipe section during bending, so that the bent pipe supporting effect is further improved.
Further, the elastic support member includes a plurality of elastic bodies 24, and the plurality of elastic bodies 24 are respectively located at both sides of the hinge shaft.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. An elbow mandrel for an elbow with a variable cross-section circumference, the elbow with a variable cross-section circumference comprises a thin pipe segment (101), a bent pipe segment (102) and a thick pipe segment (103), the elbow mandrel comprises a mandrel (21) for supporting the thick pipe segment (103) and a plurality of mandrel balls (22) for supporting the bent pipe segment (102), a first mandrel ball (22) is connected with one end of the mandrel (21), other mandrel balls (22) are sequentially connected in a direction away from the mandrel (21), and two adjacent mandrel balls (22) are hinged through a hinge shaft arranged along the radial direction of the mandrel (21);
the outer wall of the core ball (22) is provided with an annular supporting surface arranged around the extension direction of the core rod (21), and the annular supporting surface is an elliptic cylindrical surface with the long axis arranged parallel to the hinge shaft;
the distance between the annular supporting surfaces of two adjacent core balls (22) is gradually reduced;
an elastic supporting piece is arranged between two adjacent core balls (22), and two ends of the elastic supporting piece are respectively connected with the two adjacent core balls (22).
2. The elbow mandrel for a variable cross-sectional circumference elbow as claimed in claim 1 wherein the plurality of mandrel balls (22) have equal minor axis lengths and progressively decreasing major axis lengths in a direction away from the mandrel (21), the mandrel (21) having a circular cross-section and a diameter equal to the major axis of an adjacent mandrel ball (22).
3. The elbow mandrel for a variable cross-sectional perimeter elbow as claimed in claim 1 wherein the resilient support member comprises a plurality of resilient bodies (24), the plurality of resilient bodies (24) being located on either side of the hinge axis.
4. The elbow mandrel for a variable cross-sectional circumference elbow according to claim 1, further comprising a positioning core (23) for supporting the thin pipe segment (101), the positioning core (23) being located on a side of all of the core balls (22) remote from the mandrel (21) and connected to a last core ball (22).
5. An elbow mandrel for curved pipes with varying cross-sectional perimeters according to claim 4, characterized in that the outer wall of the mandrel ball (22) is provided with an annular support surface arranged around the extension of the mandrel (21), said annular support surface being an elliptic cylinder with its major axis arranged parallel to the hinge axis, the positioning core (23) having a circular cross-section and a diameter equal to the length of the minor axis of the adjacent mandrel ball (22).
6. An elbow assembly for an elbow having a varying cross-sectional circumference, comprising the elbow mandrel of any of claims 1-5.
7. The pipe bending apparatus for pipe bending with varying cross-sectional perimeter according to claim 6, further comprising a die-pushing driving mechanism connected to the mandrel (21) for pushing the pipe bending die to advance toward the mandrel ball (22) during pipe bending.
CN201911152269.0A 2019-11-22 2019-11-22 Elbow core mold for elbow with variable section perimeter and elbow device Active CN110756631B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911152269.0A CN110756631B (en) 2019-11-22 2019-11-22 Elbow core mold for elbow with variable section perimeter and elbow device

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Application Number Priority Date Filing Date Title
CN201911152269.0A CN110756631B (en) 2019-11-22 2019-11-22 Elbow core mold for elbow with variable section perimeter and elbow device

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CN110756631A CN110756631A (en) 2020-02-07
CN110756631B true CN110756631B (en) 2021-06-22

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86103963A (en) * 1985-07-17 1987-01-14 株式会社小池制作所 The plug of rectangular tube
JP2001105034A (en) * 1999-10-12 2001-04-17 Mitsubishi Heavy Ind Ltd Pipe bender
EP1488867A1 (en) * 2003-06-19 2004-12-22 Kabushiki Kaisha Opton Mandrel for bending
CN101049618A (en) * 2007-05-11 2007-10-10 上海白云汽车制管有限公司 Method and equipment for machining bent pipe with small R
CN102015141A (en) * 2008-05-06 2011-04-13 蒂森克虏伯钢铁欧洲股份公司 Supporting core for producing hollow profiled elements
CN104289570A (en) * 2014-09-25 2015-01-21 浙江工业大学 Elastic core bar for bent pipe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86103963A (en) * 1985-07-17 1987-01-14 株式会社小池制作所 The plug of rectangular tube
JP2001105034A (en) * 1999-10-12 2001-04-17 Mitsubishi Heavy Ind Ltd Pipe bender
EP1488867A1 (en) * 2003-06-19 2004-12-22 Kabushiki Kaisha Opton Mandrel for bending
CN101049618A (en) * 2007-05-11 2007-10-10 上海白云汽车制管有限公司 Method and equipment for machining bent pipe with small R
CN102015141A (en) * 2008-05-06 2011-04-13 蒂森克虏伯钢铁欧洲股份公司 Supporting core for producing hollow profiled elements
CN104289570A (en) * 2014-09-25 2015-01-21 浙江工业大学 Elastic core bar for bent pipe

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