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Small-diameter hollow blank transverse rolling precision forming method of mandril control

A hollow billet and cross wedge rolling technology, which is applied to engine components, cylinders, mechanical equipment, etc., can solve the problems of large machining allowance, high scrap rate, and poor quality of target products, and achieve the goal of expanding the scope of application and improving production efficiency Effect

Inactive Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With mandrelless rolling, the quality of the inner hole can only be improved by optimizing the mold, but there are still defects, which means that the target product quality is poor when the hollow billet is rolled without mandrel, the machining allowance is large, and the scrap rate is high

Method used

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  • Small-diameter hollow blank transverse rolling precision forming method of mandril control
  • Small-diameter hollow blank transverse rolling precision forming method of mandril control
  • Small-diameter hollow blank transverse rolling precision forming method of mandril control

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 , figure 2 , image 3 Shown is an example of precise forming of a small-diameter hollow billet cross-wedge rolling controlled by a mandrel.

[0034] Install the mold with forming angle α=35° and widening angle β=5° on the cross-wedge rolling mill, and adjust the corresponding positional relationship of the cross-wedge rolling mill. The mold diagram is as follows figure 1 As shown, the hollow bar with a diameter of Ф20mm and a length of 120mm is heated to 1100°C by an electromagnetic induction furnace, and then a heat-treated mandrel is loaded into it, and the feeding device is placed between the upper and lower molds to start the rolling mill. After the roll rotates one revolution, it is obtained as image 3 The hollow billet (length L = 125mm, outer diameter D = 10.5mm, inner diameter d = 4.6mm, uniform wall thickness) is shown, and the precise forming of the hollow billet cross wedge rolling billet has been completed so far.

Embodiment 2

[0036] With forming angle α=32 °, the mold ( figure 1 As shown) installed on the cross wedge rolling mill, adjust the corresponding positional relationship of the cross wedge rolling mill, heat the hollow valve bar with a diameter of Ф18mm and a length of 90mm through an electromagnetic induction furnace to 1000°C, and then put it into the mandrel after heat treatment , put the feeding device between the upper and lower molds, start the rolling mill, and get the following after the roll rotates one week Figure 4 The hollow blank that meets the requirements is shown (length L=116mm, outer diameter D=11mm, inner diameter d=3.2mm, uniform wall thickness).

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Abstract

The invention belongs to the technical field of the metal plastic forming, and specifically provides a small-diameter hollow blank transverse rolling precision forming method of mandril control. The method comprises the following processes: 1) according to the drawing, manufacturing a transverse rolling mould, and installing the mould on a transverse rolling mill; 2) cutting the to-be-processed hollow blank according to the process requirement, heating to 900-1150 DEG C of the rolling temperature in a heating furnace, inserting the mandril, and conveying the heated hollow blank into the transverse rolling mould on the transverse rolling mill through a push device and rolling. The mandril has the function of optimizing the inner hole in the rolling. Compared with the traditional hollow component processing technology, the method is capable of reducing the cost, improving the production rate, and bringing the obvious economic benefit.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular provides a precise forming method of a small-diameter hollow billet cross wedge rolling controlled by a mandrel. Background technique [0002] With the development of automobile lightweight, thin-walled and hollow parts are one of the ways to realize automobile lightweight, and the forming process of hollow shaft parts has also received extensive attention. [0003] In the existing hollow cross wedge rolling process, when the inner hole size of the target product is large, most of them adopt the rolling method with mandrel. The target product is small in size and is rolled without a mandrel. With mandrelless rolling, the quality of the inner hole can only be improved by optimizing the mold, but there are still defects, which means that the target product quality is poor, the machining allowance is large, and the scrap rate is high when the hollow billet is rolled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H1/18
Inventor 刘晋平纪宏超苏屏闫向哲王宝雨郑振华胡正寰
Owner UNIV OF SCI & TECH BEIJING
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