Korea Institute of Science and Technology

Yonsei University

Yoon-Bae Kim

Kwang-Koo Jee

Jun-Hyun Han

Do-Hyung Kim

Jang-Won Kim

Hyun-Kwang Seok

Ji-Young Byun

Heon-Phil Ha

Dow-Bin Hyun

Shin-Jung Yoo

The present invention relates to a method for manufacturing a Fe&#x2014;Si alloy powder. A method for manufacturing a Fe&#x2014;Si alloy powder includes: providing a mixture of an AlOpowder, an active agent powder, a Si powder, and a Fe powder; heating the mixture with a temperature of 700&#xb0; C. to 1200&#xb0; C. in the hydrogen atomosphere; magnetically separating a Fe-containing material from the mixture; and separating a Fe&#x2014;Si alloy powder by soaking the Fe-containing material in an alkali solution. In the heating of the mixture, the Si powder is deposited on the surface of the Fe powder and diffused into the Fe powder.

Method for manufacturing Fe&#x2014;Si alloy powders

A method for enhancing an initial tension by changing a wound direction of a coil spring. A large and precise initial tension is provided to the coil spring. An actuator having an excellent function is prepared by using a shape memory alloy. Each shape of the coil spring at high and low temperatures can be controlled by a flexible shape memory effect.

Method to provide initial tension for coil spring and its application

A new shrink fitting method including deformation is disclosed, in which a high bonding force can be obtained without accurate mechanical process such as forming an insertion body having an outer diameter greater than an inner diameter of an object for receiving the insertion body. The shrink fitting method comprises preparing a pipe and a rod material whose inner and outer diameters are different from each other; bonding the pipe and the rod material to each other in a state that the pipe or the rod material is deformed by heating; deforming the pipe to allow the inner diameter of the pipe to be equal to the outer diameter of the rod material; and cooling the bonded pipe and rod material. The shrink fitting method can be widely used for various mechanical parts.

Shrink fitting method including deformation

Growing community of inventors

Seoul, South Korea

Yoon-Bae Kim