Radial rolling process for ring product that can control strain distribution of ring product

Patent metadata

Field	Value
Publication number	US-10173256-B2
Application number	US-201615180257-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Sep 23, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The invention provides a radial ring rolling process for controlling strain distribution of a ring product. In the process, a ring blank is rolled by a main roll and a mandrel that are driven to rotate, while a gap between the main roll and the mandrel continuously decreases in the radial direction of the ring blank. The process includes (A) according to dimensions of the ring product and expected strain, a rolling ratio is firstly determined, dimensions of the ring blank is calculated based on the rolling ratio and the dimensions of the ring product; (B) a rotation speed curve of the mandrel is determined based on the rotation and the radial feeding speeds of the main roll; (C) the ring blank is rolled according to the rotation and radial feeding speeds of the main roll and the calculated rotation speed of mandrel in step (B).

First claim

What is claimed is:

1. A radial rolling process for a ring product that controls a strain distribution of the ring product, wherein in the radial rolling process, a ring blank is rolled by a main roll and a mandrel that are driven to rotate, to carry out the radial rolling process, the radial rolling process comprising the following steps:
(A) according to dimensions of the ring product and an expected strain, a rolling ratio λ is firstly determined, and dimensions of the ring blank are calculated based on the rolling ratio λ and the dimensions of the ring product;
(B) a rotation speed curve of the mandrel is determined based on a rotation speed of the main roll and a radial feeding speed of the main roll, so as to determine a feeding speed of the main roll and a rotation speed of the mandrel for a given constant rotation speed of the main roll, comprising:
firstly, a main roll feeding per revolution of the ring blank is calculated based on a rolling force capacity of a rolling mill used in the radial rolling process and a material yield strength of the ring blank;
secondly, the feeding speed of the main roll is calculated based on its feeding per revolution of the ring blank and its rotation speed;
thirdly, the rotation speed of the mandrel is calculated based on the rotation speed of the main roll and the feeding speed of the main roll; and
(C) the ring blank is rolled according to the rotation and radial feeding speeds of the main roll and the calculated rotation speed of the mandrel in step (B).

2. The radial rolling process for the ring product that controls the strain distribution of the ring product according to claim 1 , wherein the dimensions of the ring blank is calculated as below,
(A) firstly, selecting the rolling ratio λ according to a material plasticity, for a hot rolling process, whose temperature is higher than its austenitizing temperature, taking a value of λ=1.5-3, for a cold rolling process, whose temperature is near room temperature, taking a value of λ=1.3-1.6; and
(B) according to the dimensions of the ring product, the dimensions of the ring blank are calculated by the formula of

{

D
=

1
2

⁡

[

λ
⁡

(

D
0

+

d
0

)

+

(

D
0

-

d
0

)

λ

]

d
=

1
2

⁡

[

λ
⁡

(

D
0

+

d
0

)

-

(

D
0

-

d
0

)

λ

]

(
1
)

wherein D,d are outer and inner diameters of the ring product respectively, D 0 ,d 0 are outer and inner diameters of the ring blank respectively.

3. The radial rolling process for the ring product that controls the strain distribution of the ring product according to claim 1 , wherein the rotation speed of the mandrel is calculated as below,
(A) for the rolling mill, the feeding per revolution of the ring blank is calculated by the formula of

Δ
⁢

⁢

h
p

=

Assignees

• Univ Wuhan Tech

Inventors

• Lan Jian
• Hua Lin
• Qian Dongsheng
• Mao Huajie
• Feng Shaogui

Classifications

• B21H1/06 Primary

  rings of restricted axial length (extending closed shapes of metal bands by simultaneous rolling at two or more zones B21B5/00) · CPC title