Study on processing of shaped spinneret orifices and their effects on spinning;

Machining principle for non-cylinder pin hole of piston based on giant magnetostrictive material;

Boring a oval piston pine hole(OPPH) at rotating speed of 3 000 r/min,a boring bar must work with feed frequency of 100Hz.

Research on boring mechanism for piston noncircular pin hole;

The paper analyses the necessity for piston in modern auto to adopt noncircular pin hole.

The paper presented a new way for piston noncircular pin hole boring which uses a piezodriven displacement mechanism.

Being aimed at the difficult problem ofmachining micro shaped holes, the key technology of mi-cro--EDM system is analyzed, and the circuit topology oftraditional RC pulse generator of controlled transistor ismodified, a new micro pulse generator is designed and re-searched.

According to the complex structure of the shaped hole in a disc of an aircraft engine and the characteristic of the thermal-resistant Nickel-based alloy which is difficult to be machined, the processing tests had been done with the different combination of drilling, milling and grinding process, selection of the new coated cutter and corresponding cutting parameters.

Therefore,it's important to master its design gist of irregular hole.