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A method and device for forming a continuous multi-wave pipe with large cross-section difference

A cross-section and continuous technology, which is applied in the field of forming and installation of continuous multi-wave pipe fittings with large cross-section difference, can solve the problems of waveform quality control accuracy, forming process parameter window and forming efficiency cannot meet the requirements, etc. The effect of increasing the process window and improving the accuracy

Active Publication Date: 2020-11-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem that the waveform quality control accuracy, forming process parameter window and forming efficiency cannot meet the requirements when the existing internal high-pressure method and forming device form a super-large cross-section difference continuous multi-wave pipe fitting, and proposes a super-large cross-section difference continuous multi-wave pipe fitting. Forming method and device for pipe fittings

Method used

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  • A method and device for forming a continuous multi-wave pipe with large cross-section difference
  • A method and device for forming a continuous multi-wave pipe with large cross-section difference
  • A method and device for forming a continuous multi-wave pipe with large cross-section difference

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specific Embodiment approach 1

[0046] Specific Embodiment 1: In conjunction with Fig. 3, 6-8, the forming method and device of a continuous multi-wave pipe with super large cross-section difference in this embodiment are realized according to the following steps:

[0047] Step 1. Set the cross-sectional circle of the largest diameter corresponding to each waveform of the target pipe fitting as the parting surface A, that is, divide the whole mold into parts that can pass along the axial direction of the tube blank 4 / cavity 14, that is, the central axis of the entire forming device. Some cuboid detachable modules 12 that slide to realize closure and separation; for the convenience of mold opening and pick-up, another parting surface B is set along a certain plane perpendicular to the parting surface determined above and crossing the central axis. The waveform is evenly divided into four parts, that is, each detachable module 12 is divided into an upper module and a lower module, thereby setting the shape and ...

specific Embodiment approach 2

[0059] Specific implementation mode two: combination Figure 4 , 6-8 illustrate that in step 2, the length of the corresponding tube blank 4 for producing beneficial wrinkle storage material is determined according to each waveform. If the shapes and sizes of each waveform are different, the corresponding initial mold clearance values ​​are also different. same. In step seven, set a reasonable sequential axial feed sequence according to the relative size of the waveform, remove the gap blocks 13 pre-placed in the mold gap in sequence, and perform axial feed at an appropriate speed under pressure-holding conditions, respectively. Until all the molds are completely fit left and right. Other steps and parameters are the same as in the first embodiment.

[0060] The beneficial effect of this embodiment is: in the process of axial feeding, the forming sequence is designed according to the degree of difficulty of forming each waveform. Friction transmission has the greatest influ...

specific Embodiment approach 3

[0061] Specific implementation mode three: combination Figure 5 , 6-8 show that in step 5, if the wave pitch of the target continuous multi-wave pipe with large cross-section difference is small, the difference in the transmission effect of the friction force between the gaps between the modules during axial feeding is not significant. At this time, use After the gap block 13 determines the initial mold gap everywhere, it can be removed. During the axial feeding process, the gaps between several modules are simultaneously reduced until the left and right sides of the detachable modules 12 are completely attached. Other steps and parameters are the same as in the first embodiment.

[0062] The beneficial effect of this embodiment is: when the cross-sectional difference of each wave peak is about 100%, if the size of the tube blank is small and the number of waves is small, the force distribution of the axial feed of each mold can be considered to be relatively uniform. The tr...

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Abstract

The invention belongs to the field of material processing, and provides a method and a device for forming a continuous multi-wave pipe fitting with a large cross-section difference. The forming method is based on the theory of internal high pressure forming, adopts the idea of ​​"preparing beneficial wrinkles", and divides the forming process into four stages: assembly pre-tightening, pre-forming, axial feeding and final forming. Under the reasonable cooperation of axial force and internal pressure, "bulging-compression deformation" occurs, obtaining "beneficial wrinkles" that can be flattened by increasing internal pressure, effectively improving forming stability and part wall thickness uniformity . The forming device is composed of four parts: a pressure sealing unit, an axial feeding unit, a forming unit and a high pressure source unit. Blocks, guide plates, high-pressure pipes and high-pressure source devices simplify the structure of the forming device and improve the stability of waveform quality precision control and forming efficiency.

Description

technical field [0001] The invention relates to a forming method and device for a super-large section difference continuous multi-wave pipe fitting, in particular to a forming method and a device for realizing a super-large cross-section difference continuous multi-wave pipe fitting using fluid high pressure forming technology. Background technique [0002] In the fields of aerospace, civil automobile and petroleum industry, there is a class of continuous multi-wave pipe fittings with a circular cross-section and a large cross-section difference. This type of component is often used in places where fluids are stored and transported, heat compensation or displacement compensation is required, and energy absorption, shock absorption, noise reduction and sealing are realized. alloy and titanium alloy. In order to meet the service performance of pipe fittings under various conditions, it is usually required that its shape and dimension accuracy, wall thickness distribution, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D15/10B21D15/06C21D9/08C21D8/10
CPCB21D15/06B21D15/10C21D8/10C21D9/08
Inventor 苑世剑胡馨予何祝斌林艳丽
Owner HARBIN INST OF TECH
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