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Hot extrusion die and hot extrusion overall forming method of special-shaped square pipe

A hot extrusion die and integral forming technology, applied in metal extrusion dies, forming tools, metal extrusion and other directions, can solve the problem of inability to prepare special-shaped square tubes, solve the problem of metal filling and avoid high temperature ferrite. The effect of the formation and surface quality of the

Active Publication Date: 2020-07-28
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above analysis, the embodiment of the present invention aims to provide a hot extrusion die for special-shaped square tubes and a hot extrusion integral forming method to solve the problem of not being able to use the hot extrusion integral forming method to prepare special-shaped square tubes in the prior art. question

Method used

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  • Hot extrusion die and hot extrusion overall forming method of special-shaped square pipe
  • Hot extrusion die and hot extrusion overall forming method of special-shaped square pipe
  • Hot extrusion die and hot extrusion overall forming method of special-shaped square pipe

Examples

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Effect test

Embodiment 1

[0042] This embodiment provides a hot extrusion die for special-shaped square tubes, such as figure 1 , Figure 3-5 As shown, it includes a mold cavity cover 1 with a special-shaped cavity, and a hot-extruded mandrel 2 is arranged inside the mold cavity cover 1, and the area between the mold cavity cover 1 and the hot-extruded mandrel 2 forms a mold cavity hole of a special-shaped square tube ; There is a first extrusion diversion hole and a second low-pressure diversion hole below the mold cavity hole of the special-shaped square tube; The location of the center of the truncated face.

[0043] Specifically, the hot extrusion die provided by the present invention is used to extrude a special-shaped square tube. The hot extrusion die includes a mold cavity cover 1 with a special-shaped cavity inside, and the shape of the special-shaped cavity constitutes the external shape of the special-shaped square tube; The mandrel 2 is fixed inside the cavity cover 1, and the shape of th...

Embodiment 2

[0062] This embodiment provides a method for integral forming of a special-shaped square tube by hot extrusion, which includes the following steps:

[0063] Step 1, heating the blank and expanding the hole;

[0064] Step 2. Carry out a second heat treatment to the blank after the hole is expanded;

[0065] Step 3, using a special-shaped square tube hot extrusion die to hot extrude the billet;

[0066] Step 4. Air-cool the hot-extruded special-shaped square tube to room temperature, and inspect the surface quality and mechanical properties of the special-shaped square tube.

[0067] It should be noted that the step 1 of the hot extrusion integral forming method for special-shaped square tubes of the present invention also includes blank preparation, and the specific process of blank preparation is as follows:

[0068] Surface turning, sawing, grinding, and prefabricated holes are carried out on the forged round steel. The process requirements: after turning the outer surface ...

Embodiment 3

[0084] This example uses the special-shaped square tube hot extrusion die provided in Example 1 and the special-shaped square tube hot extrusion integral molding method provided in Example 2 to prepare a special-shaped square tube. The specific steps are as follows:

[0085] Step 1, heating the blank and expanding the hole;

[0086] Firstly, the billet is machined, the process is: surface turning, sawing, turning and grinding, and prefabricated holes on the forged round steel with the grade S45000. The process requirements: after turning the outer surface of the round steel, the surface is smooth and free of defects. Roughness ≤ 3.2μm, the end surface of the blank after sawing is turned and ground, the cutting slope of the two end surfaces is ≤ 2mm, the outer diameter of the blank after processing The length is 900-1000mm, and a prefabricated hole is made on one of the end faces. The hole is located at the center of the end face circle. The diameter of the bell mouth is 235mm...

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Abstract

The invention relates to a hot extrusion die and a hot extrusion overall forming method of a special-shaped square pipe, and belongs to the fields of an extrusion forming technology and a special-shaped material manufacturing technology. The problem that in the prior art, the special-shaped square pipe cannot be prepared with a hot extrusion overall forming method is solved. The hot extrusion overall forming method of the special-shaped square pipe includes the steps that 1, a blank is heated and broached; 2, the broached blank is heated at a second time; 3, the blank is subjected to hot extrusion through the hot extrusion die of the special-shaped square pipe; and 4, the special-shaped square pipe obtained after hot extrusion forming is air-cooled to room temperature, and the surface quality and the mechanical performance of the special-shaped square pipe are checked. The prepared special-shaped square pipe is good in surface quality and high in dimensional precision, all performanceindexes meet the design requirements through physical and chemical analysis and mechanical performance testing, and the overall quality meets the industrial use requirements.

Description

technical field [0001] The invention relates to the fields of extrusion molding technology and special-shaped material manufacturing technology, in particular to a hot extrusion die for a special-shaped square tube and a hot extrusion integral molding method. Background technique [0002] Special-shaped square tube is a special profile, which is used in aviation, aerospace, ships and other fields. Because of its streamlined shape, it is a good load-bearing structure. [0003] In China, the forming method of this special-shaped square tube generally adopts the method of welding after splicing. However, there are no reports in the literature on the production of special-shaped square tubes by integral molding by hot extrusion. [0004] Since the hot extrusion overall forming method can be formed at one time and guarantee the performance and size requirements, but this forming method also has difficulties. Any problem in the heating process, tool and mold design, lubrication e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C31/00B21C23/08B21C23/21B21C29/00B21D41/02B21D37/16
CPCB21C25/02B21C31/00B21C23/085B21C23/217B21C29/003B21D41/02B21D37/16
Inventor 刘振宝胡家齐王晓辉梁剑雄孙永庆厉勇王长军杨志勇苏杰宁静高玉光高杰侯冲刘富强张爱亮叶丙义
Owner CENT IRON & STEEL RES INST
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