To enable many processing materials to be press heated at once by a method wherein a plurality of pipe receivers are fixed to an inside of a two- divided type heating furnace, pipes of heat-resistant steel are installed in them, a bottom part of a hydraulic cylinder is fixed to a rear end of a frame and a lid pressing member is fixed at a front end with a rotating section.

Six circumferential heat-resistant steel pipe receivers 3 of steel are arranged at two locations in a two-divided heating furnace F. Heat-resistant steel pipes 5 are mounted in them and a stainless steel bellows 12 and a rod-part water-cooled type hydraulic cylinder 16 are set at a rear part of it. A flange section at a front part is water-cooled, an O-ring 28 is fixed to it, a hinge-type lid 11 is set and they are fixed by two handles 30. Then, a lid pressing member 20 having a cross-shaped one hinge is mounted at a front surface of the frame 19 with a shape steel. Even if a strength of the pipe 5 is decreased during its hot processing operation, the intermediate part of it pushed by the pipe receiver 3, so that the processing materials of several blocks may not bent even if they are pushed by the hydraulic cylinder 16.