Title:
PARISON THICKNESS CONTROL METHOD IN BLOW MOLDING MACHINE
Document Type and Number:
Japanese Patent JP3035145
Kind Code:
B2
Abstract:
PURPOSE: To produce a profile automatically and properly by a method wherein a position of an inflection point for a height of a product and a moving quantity of a die necessary for controlling the thickness at the point are computed and a spline interpolation is performed for the point so as to produce a profile having a thickness of a parison.
CONSTITUTION: An extruding device 11 rotates a ball screw 3 by a servomotor 1 through a cup ring 2, adjusts up-and-down movement of a die 4 so as to adjust a clearance between the die and a core 5, and changes a thickness of a parison. The servomotor 1 is controlled by a servo controller 7 through a servo amplifier 6. In this case, to a setting/displaying device 9 equipped with a monitoring double-face 10, a height, an outer diameter, and a thickness of a product are inputted. By a programmable controller 8, a position of an inflection point with respect to the height and a moving quantity of the core 5 or the die 4 necessary for controlling the thickness at the point are computed, and a spline interpolation or linear interpolation is performed for the point so as to produce a profile having the thickness of the parison.
Inventors:
Mikio Uchiyama
Application Number:
JP2167494A
Publication Date:
April 17, 2000
Filing Date:
February 21, 1994
Export Citation:
Assignee:
Tahara Co., Ltd.
International Classes:
B29C49/04; B29C49/78; B29L22/00; (IPC1-7): B29C49/78; B29C49/04
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)