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US 5,108,672 AGranted
Apparatus for and method of controlling temperature in plastic compression molding machine
AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorsYosuke Sasaki, Noboru Harashima, Kazuhiro Mimura
Life of this patent
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Abstract
The temperatures of structural members of a plastic compression molding machine are controlled so that the socket-and-spigot gap between the dies is maintained at a constant size or so that changes in the socket-and-spigot gap between the dies is maintained below an allowable limit. Working oil for the lift cylinder is passed through passages in at least the bolster, the slide, and the frame. A temperature controller can include heat exchangers and/or flow-rate control valves to control the temperature and/or flow rate of the portion of the working oil to be circulated through the respective structural member.
Claims23
A method of controlling an operating temperature of a bolster, a slide, and a frame in a plastic compression molding machine containing structural members including said bolseter, said slide, and said frame, said bolster and said slide being attached to said frame;
- each of said structural members having size and thermal expansion coefficients;
- said bolster being connected to a stationary die;
- said slide being connected to a movable die;
- said slide being connected to a lift cylinder for driving said movable die towards said stationary die to form a shut height gap between said dies;
- said slide having at least one liquid passage provided therein;
- said bolster having at least one liquid passage provided therein;
- said frame having at least one liquid passage provided therein;
- said molding machine having circulating means for supplying working oil from a working oil tank to said lift cylinder and for passing working oil from said lift cylinder to said working oil tank;
- which method comprises the steps of:
- calculating, from the sizes and thermal expansion coefficients of said bolster, said slide and said frame a value of said operating temperature which maintains the shut height gap between the dies of said machine below a predetermined allowable limit value;
- circulating a portion of the working oil from said working oil tank at a first flow rate through said at least one liquid passage of said bolster;
- circulating a portion of the working oil from said working oil tank at a second flow rate through said at least one liquid passage of said slide;
- circulating a portion of the working oil from said working oil tank at a third flow rate through said at least one liquid passage of said frame;
- and
- controlling at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said bolster and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said bolster, at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said slide and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said slide, and at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said frame and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said frame.
12 more elements
A plastic compression molding machine which comprises:
- structural members including a bolster, a slide, and a frame, said bolster and said slide being attached to said frame a stationary die supported by said bolster;
- a movable die supported by said slide;
- a lift cylinder connected to said slide, said lift cylinder being for driving the movable die towards the stationary die;
- said bolster having at least one liquid passage provided therein;
- said slide having at least one liquid passage provided therein;
- said frame having at least one liquid passage provided therein;
- a working oil tank;
- circulating means for supplying working oil from said working oil tank to said at least one liquid passage of said bolster, to said at least one liquid passage of said slide, and to said at least one liquid passage of said frame;
- and temperature control means for controlling at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said bolster and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said bolster, for controlling at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said slide and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said slide, and for controlling at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said frame and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said frame.
6 more elements
A plastic compression molding machine which comprises:
- structural members including a bolster, a slide, and a frame, said bolster and said slide being attached to said frame;
- a stationary die supported by said bolster;
- a movable die supported by said slide;
- a lift cylinder connected to said slide, said lift cylinder being for driving the movable die towards the stationary die;
- said bolster having at least one liquid passage provided therein;
- said slide having at least one liquid passage provided therein;
- said frame having at least one liquid passage provided therein;
- a working oil tank;
- circulating means for supplying working oil from said working oil tank to said at least one liquid passage of said bolster, to said at least one liquid passage of said slide, and to said at least one liquid passage of said frame;
- a first temperature sensor for sensing a temperature of said bolster and producing a first signal representative of the thus sensed temperature of said bolster;
- a second temperature sensor for sensing a temperature of said slide and producing a second signal representative of the thus sensed temperature of said slide;
- a third temperature sensor for sensing a temperature of said frame and producing a third signal representative of the thus sensed temperature of said frame;
- and temperature control means for controlling, responsive to said first signal, at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said bolster and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said bolster, and for controlling, responsive to said second signal, at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said slide and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said slide, and for controlling, responsive to said third signal, at least one of the temperature of the portion of the working oil circulating through said at least one liquid passage of said frame and the flow rate of the portion of the working oil circulating through said at least one liquid passage of said frame.
10 more elements
Dependencies are inferred from the claim text.