· High rigidity frame design, using high quality steel plate welding， after eliminating internal stress processing, improve the stability and reliability of the accuracy of the whole machine. · The machine adopts high alloy steel, single crankshaft, a working center. crank and connecting rod support structure， and optimizes the design. · In order to ensure the relative stability of machine operation the design method of symmetrical two balancer devices is adopted. E-mail: [email protected]