Combined ring rolling method for spherical valve body

Patent metadata

Field	Value
Publication number	US-9919390-B2
Application number	US-201514859160-A
Country	US
Kind code	B2
Filing date	Sep 18, 2015
Priority date	Sep 24, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

This invention relates to a combined ring rolling method for spherical valve body, which has the following procedures: 1) design for ring blank by computing ring blank volume and selecting reasonable rolling ratio according to the dimensions of forged ring; 2) design for rolling gap which includes the shapes and dimensions of working surfaces of main roll, mandrel and passive rolls according to the dimensions of ring blank and forged ring, the stable deformation condition of combined ring rolling and structure requirement of rolling equipment; 3) rolling forming with three stages of surface cross rolling, ring rolling and shaping by controlling of feeding speed of main roll and working positions of passive rolls. This invention has the technical economical advantages of low consumptions of energy and materials, high productivity and low production cost.

First claim

What is claimed is:

1. A combined ring rolling method for manufacturing a spherical valve body, comprising the following steps:
1) designing a ring blank by providing a ring blank section as a rectangular section having a size designed as following steps:
i) determining a volume V 0 of the ring blank, wherein a forged ring volume V is calculated using the following equation

V
=

π
⁢

⁢

BR
2

-

π
⁢

B
4

12

-

π
⁢

⁢

Br
2

,

 wherein R, B and r are respectively spherical radius, height and inner radius of the forged ring, and r is an half value of the forged ring inner diameter d; wherein a oxidation loss coefficient α is in a range of 3% to 5%; and wherein the ring blank volume V 0 is designed as V 0 =(1+α)V;
ii) determining a rolling ratio by providing a rolling ratio k=s 0 /s, wherein s 0 is a section area of the ring blank and s is a section area of the forged ring; wherein the ring blank section area s 0 is calculated as s 0 =(R 0 −r 0 )B 0 , wherein R 0 , B 0 and r 0 are respectively outer radius, height and inner radius of the ring blank, and R 0 is an half value of the ring blank outer diameter D 0 , r 0 is an half value of the ring blank inner diameter d 0 ; wherein the forged ring section area s is calculated as

s
=

R
2

⁢

⁢
arcsin
⁢

B

2
⁢
R

-

0.5
⁢

⁢
B
⁢

R
2

-

0.25
⁢

⁢

B
2

+

B
⁡

(

R
2

-

0.25
⁢

⁢

B
2

-
r

)

;

 wherein a valve of k is in a range of 1.2 to 3; and
iii) determining the ring blank size, wherein the ring blank height B 0 =B; wherein the ring blank inner radius r 0 can be is designed as

r
0

=

V
0

2
⁢
π
⁢

⁢
ks

-

ks

2
⁢

B
0

;

and
wherein the ring blank outer radius R 0 can be is designed as

R
0

=

V
0

2
⁢
π
⁢

⁢
ks

+

ks

2
⁢

B
0

;

2) designing a rolling gap by a combined ring rolling process including two stages of surface cross rolling and general ring rolling; wherein during the surface cross rolling stage, the rolling gap is made up of working surfaces of a main roll and two passive rolls; wherein during the general ring rolling stage, the rolling gap is made up of working surfaces of the main roll and a mandrel; wherein the working surfaces of the main roll, the mandrel, and the two passive rolls are respectively designed as follows:
I) determining the working surface of the main roll, wherein the main roll is adopted as a closed structure, and the working surface of the main roll is designed as a spherical surface; wherein a spherical radius of the main roll R m =R; wherein a height of the working surface of the main roll B m =B+ζ 1 mm, wherein a valve of ζ

Assignees

• Univ Wuhan Tech
• Wuhan Univeristy Of Tech

Inventors

• Hua Lin
• Qian Dongsheng
• Deng Jiadong
• Wang Xiaokai

Classifications

• B23P15/001 Primary

  valves or valve housings (welding B23K; valve housings per se F16K) · CPC title

• B21H1/06

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

• Y10T29/49405

  Valve or choke making · CPC title

• B21H7/00

  Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B21G3/30) · CPC title

• B21H1/12

  rings for ball or roller bearings · CPC title