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Internal high pressure forming die and method of elbow T-branch pipe

A technology for internal high-pressure forming and tee pipes, which is applied in the field of high-pressure forming molds for tee pipes. It can solve problems such as thickening of the bottom of tee pipes, achieve uniform wall thickness, increase forming limit, and reduce compressive stress.

Active Publication Date: 2014-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that there is no storage bin at the bottom of the main cavity of the existing internal high-pressure forming mold, the bottom of the formed tee pipe is seriously thickened due to compression deformation, and a high-pressure elbow tee pipe is proposed. Forming die and method

Method used

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  • Internal high pressure forming die and method of elbow T-branch pipe
  • Internal high pressure forming die and method of elbow T-branch pipe
  • Internal high pressure forming die and method of elbow T-branch pipe

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specific Embodiment approach 1

[0036] Specific implementation mode one: combine figure 1 , Figure 6 and Figure 8 Describe this embodiment, this embodiment comprises lower die 1, upper die 2, first punch 3, second punch 4 and intermediate punch 5, upper die 2 and lower die 1 are fastened and set, upper die 2 and lower die A main cavity 8 is arranged between the molds 1, the first punch 3 is set at one end of the main cavity 8, the second punch 4 is set at the other end of the main cavity 8, and the inside of the first punch 3 is provided with a Liquid hole 6, one end of the liquid injection hole 6 communicates with the main cavity 8, the other end of the liquid injection hole 6 is connected with the hydraulic system, the top of the main cavity 8 is provided with a branch cavity 9, and the main cavity 8 is connected to the branch type The cavities 9 communicate with each other, the intermediate punch 5 is arranged in the branch cavity 9, and the bottom of the main cavity 8 is provided with two storage bin...

specific Embodiment approach 2

[0037] Specific implementation mode two: combination Figure 1 to Figure 10 Describe this implementation mode, this implementation mode is realized through the following steps:

[0038] Step 1. Determine the diameter D of the main cavity 8 according to the diameter of the tube blank 10: the diameter D of the main cavity 8 is equal to the diameter of the tube blank 10, see figure 1 and Figure 4 ;

[0039] Step 2: Determine the diameter and depth of the storage bin 7 according to the diameter D of the main cavity 8: the diameter of the storage bin 7 is d c , the depth of storage bin 7 is h c ,See image 3 , the specific calculation formula is as follows:

[0040] d c ≤ ( π + α 2 π ) D or d c ≤ ...

specific Embodiment approach 3

[0049] Specific implementation mode three: combination figure 1 and figure 2 Describe this embodiment, in this embodiment, when the bending angle α=0° of the pipe blank 10 in step 2, the diameter d of the storage bin 7 is calculated according to formula 1 c ≤0.5D, the depth of storage bin 7 is calculated according to formula 2 as h c ≤0.5D. Other steps are the same as in the second embodiment.

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Abstract

The invention discloses an internal high pressure forming die and method of an elbow T-branch pipe, relates to an internal high pressure forming die and method of a T-branch pipe, and aims to solve the problems that the bottom of a main cavity of an existing internal high pressure forming die is not provided with storage bins, and therefore the bottom of the formed T-branch pipe is compressed, deformed, and then seriously thickened. The die is characterized in that a branch pipe cavity communicated with a main cavity is formed in the top of the main cavity, and two storage bins are arranged at the bottom of the main cavity. The method includes the steps that firstly, the diameter D of the main cavity is determined; secondly, the diameter and the depth of the storage bins are determined; thirdly, a pipe blank is placed in a cavity of a lower die; fourthly, the two ends of the pipe blank are sealed through a first punch and a second punch; fifthly, internal pressure is injected; sixthly, the first punch and the second punch move towards the middle through external force for feed supplement, and extruded materials flow into the storage bins and the branch pipe cavity after the pipe fitting blank bulges; seventhly, the die is opened, and a part is taken out; eighthly, the process section of the part is cut off, and then bent and formed elbow T-branch pipe is obtained. The internal high pressure forming die and method are used for forming of the T-branch pipe.

Description

technical field [0001] The invention relates to a high-pressure forming die and method for a three-way pipe, in particular to a high-pressure forming die and method for an elbow three-way pipe. Background technique [0002] The internal high-pressure forming tee is integrally formed, and the internal high-pressure forming tee avoids deformation during welding and unreliability of the weld seam, and improves the dimensional accuracy, strength and stiffness of the parts, especially the fatigue strength. It can improve the gas flow characteristics in the pipe fittings, and the structural shape design is more flexible and optimized. The internal high-pressure forming process of the tee pipe requires the combined action of the axial punch, the intermediate punch and the internal pressure, and a reasonable forming interval must be passed to form a qualified tee part. First put the tube blank into the lower mold, after closing the upper mold, fill the tube with liquid, seal it wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/047B21D26/037
Inventor 刘钢苑世剑彭俊阳
Owner HARBIN INST OF TECH
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