CAD/CAE application in centering EDM machine design
The centering EDM machine can be completed online centering hole processing. Traveling by the high speed line feed mechanism, low speed line feed mechanism, rotating body, lifting body, auto body for baseball, Swing components, such as buffer baffle. The advantage of this approach is: a small device, processing consistency, and efficient processing, process automation, and effective in the elimination round billet rolling wear puncher into a capillary formed by the iron handle. In order to design the machine, the CAD/CAE technology, basing on the conception of global structure, dwelling on selecting motor, 3D modeling with solidworks, dynamic simulation with cosmosmotion, and analysis the key parts using finite element method were presented.
Development of new material and heat treatment for tools ensuring high performance in hot seamless tube rolling
Abstract A new technology has been developed to improve the life of tools used for high temperature steel rolling in seamless tube manufacturing. It is a joint technology combining a new chemical composition and a special heat treatment. The new steel tool material has high Cr, C, and Ni contents compared with those of the conventional tools in order to increase the volume fraction of carbide which increases wear resistance. Through the new heat treatment, the macroscopic distribution pattern of eutectic carbide changes from meshlike to granular form increasing resistance against crack propagation. The validity of the results in the laboratory has been verified on the production line.
Development and Optimization of Carbide-Reinforced Tools and Application to Hot Rolling of Stainless Steel
A new design philosophy was tried out on a carbide-reinforced tool for hot working of stainless steel. The carbide particle in the microstucture of the new tool was selected so as to meet the relatively large optimum size. Attention has been focused. in the conventional tool, on the enlargement of the area fraction of fine carbide particles on the surface. The tool was made by a plasma transferred arc process, and it was found in the laboratory that an optimum mixture ratio of NbC and AISI316L powder realizes the best performance against wear and galling. It was also found that coating of the new tool material on the mother metal of moderate strength, toughness, and ductility ensures the longevity of the tool. The new tool was subjected to hot rolling of a stainless-steel seamless tube by a plug mill to verify the high performance.