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A method and device for three-dimensional hot bending forming of polymer pipe fittings

A three-dimensional, high-polymer technology, applied in the field of three-dimensional hot-bending forming methods and devices for high-polymer pipe fittings, can solve the problems of small size range, unstable quality, limited bending angle and bending surface of bent pipe fittings, etc. , to achieve the effects of controlling surface quality and cross-sectional shape, reducing process costs, and wide range of bending angles

Active Publication Date: 2020-12-25
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that in the existing method, the size range of bent pipe fittings is small, the quality after hot bending is unstable, and the bending angle and bending surface are limited. A three-dimensional hot bending of polymer pipe fittings is provided. Molding method and device

Method used

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  • A method and device for three-dimensional hot bending forming of polymer pipe fittings
  • A method and device for three-dimensional hot bending forming of polymer pipe fittings
  • A method and device for three-dimensional hot bending forming of polymer pipe fittings

Examples

Experimental program
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Effect test

Embodiment 1

[0055]Using the method of this example to perform three-dimensional bending molding of polyetheretherketone pipe fittings with an outer diameter of 12mm and a wall thickness of 1mm, the bending radius is required to be 50mm, the bending angles are 20° and 50° respectively, and the straight line between two adjacent elbows The segment length is 10 cm. For pipe fittings with an inner diameter of ≤10mm, no soft core mold is required in the bending process. Such as figure 1 As shown, the hot bending mold device includes a space corner assembly 1, a soft polyurethane core mold 2, an anti-wrinkle mold 3, a bending mold 4, a polyetheretherketone tube 5, a heating rod 6, a clamping mold 7, and an auxiliary clamping mold 8.

[0056] (11) heat treatment

[0057] Place the polyether ether ketone straight pipe to be bent in an oil pool at 120°C, soak for 30 minutes, take out clean water and wash it.

[0058] (12) Bend the first elbow with a bending angle of 20°

[0059] First, use the...

Embodiment 2

[0065] Using the method of this embodiment to perform three-dimensional bending molding of polyetheretherketone pipe fittings with an outer diameter of 25mm and a wall thickness of 1.5mm, the bending radius is required to be 100mm, and the bending angles are 50° and 90° respectively. The straight line length is 10cm. The internal supporting soft mandrel of the pipe fitting is a polyurethane elastic soft mandrel, and the outer diameter of the soft mandrel is 21.80-21.96mm.

[0066] (11) heat treatment

[0067] Put the polyether ether ketone fittings in an oil pool at 130°C, soak for 75 minutes, take out the water and wash them.

[0068] (12) Bend the first elbow with a bending angle of 50°

[0069] First, heat the temperature of each mold with heating rod 6: anti-wrinkle mold 120°C, auxiliary clamping mold 120°C, bending mold 115°C, clamping mold 102°C;

[0070] Then pass the polyether ether ketone straight pipe 5 to be bent through the soft mandrel 2 and place it in the gro...

Embodiment 3

[0075] Using the method of this embodiment to carry out three-dimensional bending molding of polyetheretherketone pipe fittings with an outer diameter of 38mm and a wall thickness of 1.5mm, the bending radius is required to be 152mm, and the bending angles are 20° and 50° respectively. The straight line length is 10cm. The internal supporting soft mandrel of the pipe fitting is a polyurethane elastic soft mandrel with an outer diameter of 34.80-34.96 mm.

[0076] (11) heat treatment

[0077] Put the polyether ether ketone pipe fittings in an oil pool at 140°C, soak for 120 minutes, take out clean water and wash them.

[0078] (12) Bend the first elbow with a bending angle of 20°

[0079] First, use the heating rod 6 to heat the temperature of each mold: the anti-wrinkle mold is 125°C, the auxiliary clamping mold is 130°C, the bending mold is 120°C, and the clamping mold is 125°C;

[0080] Then pass the polyether ether ketone straight pipe 5 to be bent through the soft mandr...

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Abstract

The invention discloses a high molecular pipe fitting space three-dimensional hot bending forming method and apparatus. The molecular pipe fitting space three-dimensional hot bending forming method comprises the following steps: (1) heat treatment is conducted; (2) a first bending head is bent, specifically, all modules are heated, a to-be-bent high molecular straight pipe penetrates through a soft mandrel, the to-be-bent high molecular straight pipe is heated, the high molecular straight pipe moves forward so that a heating section can be arranged inside a groove of a bending die, a clamping-auxiliary die and a clamping die get close to the die to clamp a pipe fitting, the clamping die rotates around the bending die at a certain speed, and at the same time the clamping-auxiliary die moveswith the clamping die, when the high molecular pipe is bent to a certain angle, the clamping die stops rotating, the clamping die and the clamping-auxiliary die are released in sequence, and the bending head is cooled; (3) the next bending head is bent; the high molecular straight pipe is rotated to a certain angle, and bending is conducted according to the step (2); and (4) the step (3) is repeated until space three-dimensional bending of multiple bending heads is completed. According to the molecular pipe fitting space three-dimensional hot bending forming method, space continuous bending of the multiple bending heads of the large-size high molecular pipe fitting can be quickly realized, design and machining of flexible moulds are omitted, and the technology cost is efficiently lowered.

Description

technical field [0001] The invention belongs to the technical field of polymer pipe fitting processing, and in particular relates to a method and device for three-dimensional thermal bending of a polymer pipe fitting. Background technique [0002] Polymer engineering plastics have excellent impact toughness, wear resistance, high melting point and heat resistance, good solvent resistance and chemical corrosion resistance, and excellent comprehensive performance. The formed pipelines are widely used in automobiles, air conditioners and other industries Wide range of applications. At present, most polymer pipe fittings are formed by injection molding to form various pipelines. This method has to design complex injection molds, which is not only expensive, but also has a long production cycle, and is only applicable to simple pipelines. Limited by the complexity of the mold and the extremely high process cost, it is difficult for injection molding to realize three-dimensional ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C53/08B29C53/80B29C53/82B29C53/84
CPCB29C53/083B29C53/80B29C53/82B29C53/84
Inventor 陈奇海倪祖国方良超施廷光霍绍新姚芮
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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