PURPOSE: To improve dimensional accuracy in the stage of piercing a blank material with a skew roll piercer and producing a hollow blank pipe by measuring the size and shape prior to piercing of a plug to be used for piercing at every piercing and adjusting the preparatory plan for the piercer adapted to the plug in accordance with the result of the measurement.
CONSTITUTION: A measurement device 2 for the size and shape of a plug is disposed in the standby position of a piercer 1 and measures the size and shape of a plug 12 prior to piercing at very piercing. The signal of the result thereof is transmitted to an arithmetic device 3. The relational equation determined beforehand by experiment or the like to determine the relation between the actually measured size of the plug 12 and various preparatory settings of the piercer 1 is stored in the device 3. The device 3 performs the adjustment for the preparatory plane of the piercer 1 adapted to the characteristic in accordance with the measured result.
NISHIKAWA KOUICHIROU
JPS55106611A | 1980-08-15 | |||
JP57122711B |