Reducer is used for pipe diameter changes in a pipe. Usually adopted for reducing the forming process of pressing, expanding to suppress or reducing and expanding, to certain specifications of the reducer and stamping can be applied.
A. reducing/expanding forming reducing forming technology of reducer is will be equal and reducer big end diameter of tube rounds into the forming mould, pass along the axial direction of tube billet, shrink along the cavity movement and metal forming. According to the size of the reducer, divided into the one of pressing or more press forming. Below for reducing the forming ofconcentric reducer.
Forming hole diameter is less than reducer big end diameter of the tube billet, used in die forming along the tube billet diameter hole enlargement. Hole enlargement technology mainly to solve the reducer in the variable diameter is larger not easily by reducing forming, sometimes according to the requirements of the materials and products forming, expanding and reducing method of combination.
In the process of reducing or expanding deformation, according to different materials and variable diameter, determination by cold pressing and hot pressing. Under normal circumstances, as far as possible by cold pressing, but the multiple variable diameter and cause serious work hardening of the thick or alloy steel, wall thickness of materials appropriate USES hot pressing.
In addition to the use of steel tube as raw material to produce reducer, the part of the specifications of the reducer can also be used steel plate stamping forming technology is adopted to improve the production. Drawing die shapes used by reference to reducing tube surface size design, use after blanking punching die, stamping steel stretch forming.
The stress distribution and deformation characteristics:
1) the inner pressure function similarly hereinafter heart reducer an area about the size of the pressure difference between the bending moment caused by big end is relatively open, small end relative shrinkage phenomenon;
2)inner pressure under the action of eccentric reducer central eccentric side inside the big end surface and eccentric side to the outer ring stress is the largest.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)