Patent ID: 7766072
Filing Date: 2010-08-03
Classification: B22D,B29C

Abstract:
1. A molding machine injecting a melt into a cavity defined by a clamped fixed mold and a moving mold, comprising: a fixed mold plate holding said fixed mold, a moving mold plate holding said moving mold and moveable in a mold open and close direction with respect to said fixed mold plate, a plurality of tie bars each having a coupled part coupling with one of said fixed mold plate and said moving mold plate and a tie bar drive piston accommodated at the other of said fixed mold plate and said moving mold plate and generating clamping force, a plurality of coupling parts provided at said one of said fixed mold plate and said moving mold plate and able to be coupled with or released from the coupled parts of said plurality of tie bars, a plurality of clamping cylinders provided at said other of said fixed mold plate and said moving mold plate and having cylinder chambers accommodating said plurality of tie bar drive pistons and at least two working fluid feed ports feeding working fluid generating the clamping force into said cylinder chambers, an injection system injecting the melt into said cavity after the completion of clamping by said clamping cylinders, position sensors detecting positions of said plurality of tie bar drive pistons in the mold open and close direction with respect to said other of said fixed mold plate and said moving mold plate, and a burr detector detecting the occurrence of a burr according to whether or not displacement amounts of said plurality of tie bar drive pistons detected by said position sensors for a period from the start of the injection by said injection system to the completion of the injection are within predetermined permissible ranges.