HM series adopts the same specification of double cylinder host, equipped with dual-machine linkage synchronous device, double-machine linkage bending machine can process special workpieces, especially for urban construction, automobile manufacturing, highway streetlamp poles, power poles and other special workpieces processing and manufacturing, two machines can be used alone, can be double-machine linkage, optional workbench with liquid compensation,eliminate the compensation on both sides of the bend, eliminate the deflection deformation on both sides of the bending.