No.59 Institute of China Ordnance Industry

Southwest Technology and Engineering Research Institute

Harbin Institute of Technology at Weihai

Hong Zhan

Qiang Chen

Yuanyuan Wan

Zhihui Xing

Yanbin Wang

Gaozhan Zhao

Jianquan Tao

Zhiwei Huang

Ming Li

Maochuan Wang

Shuxin Chai

Gang Chen

Dayu Shu

Lin Xiang

Yunliang Xiang

Yan Tang

Xiaohui Lin

Xiaosong Li

Xusheng Chang

Hongming Zhang

A fine blanking device and method for forming a friction plate with friction material layers. The fine blanking device includes an upper die, a lower die, a guide mechanism, a punch and a counter punch. Upper and lower blank holders are respectively provided at outer circumferences of the punch and the counter punch. The upper and lower blank holders are respectively provided with a buffer mechanism. Friction material powders are sintered on both sides of the base sheet. The friction material layers are trimmed and planished by hot pressing. The base sheet with the friction material layers is fixed by the upper blank holder and the lower blank holder. A tooth profile with an absolute shear fractural surface is formed. The fixing indentation of the V-shaped structure of the friction material layers is cut off for obtaining a finished friction plate product with the friction material layers.

Fine blanking method and device for forming friction plates with friction material layers

The application provides a plaster casting mold fabrication method for a complicated structure aluminum alloy casting with a large inner cavity and a thin wall, in which, a wax pattern is cleaned with a mixture; closed blind cavity and large plane unbeneficial to plaster mold-filling of the wax pattern are used to exhaust air by using vent holes and waterproof-breathable membranes in cooperation with each other; under pressure difference, plaster powder and mixed aqueous solution are vertically splashed and mixed in a mixing tank to reduce dust discharge; asynchronous mixing and grouting can be realized by left and right mixing tanks in an upper tank of a vacuum tank. The present application can effectively remove the surface parting agent, increase the wettability of the plaster paste and the wax pattern surface, and improve the surface finish of the casting mold.

Plaster casting mold fabrication method for a complicated structure aluminum alloy casting with a large inner cavity and a thin wall

A method for vacuum smelting and variable pressure solidification forming aluminum alloy piece with ultra-thin wall and high gas tightness is provided, in which an induction heating furnace is set in a vacuum tank, a quartz crucible with thickness of 5&#x2dc;8 mm is used; a preheated aluminum alloy ingot is placed in the crucible, side doors of the tank is closed, and a vacuuming processing is performed for the tank; the melt is filled from the bottom layer of the casting; when the melt reaches to the top, the main valve and the air-release valve are turned on until the inside and outside pressures are consistent, and then the casting is taken out. The requirement of high air tightness for vacuum tank is reduced, and aluminum alloy casting with high quality can be obtained at lower cost.

Method for vacuum smelting and variable pressure solidification forming aluminum alloy piece with ultra-thin wall and high gas tightness

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Chongqing, China

Hong Zhan