Control method of pressure-holding process in injection molding machine
A technology of an injection molding machine and a control method, which is applied in the field of pressure maintaining process control in an injection molding machine, can solve problems such as overtravel or fluctuation, poor forming, gate blockage, etc., and achieve the effect of improving quality
Inactive Publication Date: 2016-08-17
TOYO MACH & METAL CO LTD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Also, if the decompression is too fast, excessive overtravel or fluctuation will occur after reaching the specified pressure, which may cause molding failure or gate clogging.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0057] Below, through figure 1 ~ Fig. 8, illustrate the embodiment of the present invention. Of course, it goes without saying that the present invention can be easily applied to configurations other than those described in the embodiments within a range that does not deviate from the gist of the invention.
[0058] figure 1 It is a front view showing the injection unit 2 configured in the injection molding machine 1. As shown in this figure, the injection unit 2 is configured with a hopper 3 into which granular raw materials, namely resin (pellets), are fed; A cylinder-shaped heating cylinder 4 for granular resin; a screw 5 that measures molten resin that is supplied into the heating cylinder 4 and plasticized by heat; a device that injects and fills the measured molten resin into the cavity of a mold The injection nozzle 6 at the front end of the heating cylinder 4; when kneading the molten resin in the heating cylinder 4, etc., the metering motor 8 as a driving source tha...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
Provided is a method of controlling a pressure-maintaining step for an injection-molding machine capable of molding a high quality molded body, pressure control in a pressure maintaining step executed after an injection step being performed with high precision. A control method in an injection molding machine in which there are performed an injection-filling step for advancing a screw and injecting molten resin to fill a die cavity and a pressure maintaining step for retracting the screw and reducing the pressure, wherein a switch is made to the pressure maintaining step after injection filling has concluded in the injection filling step, the screw is rapidly retracted by reducing a primary pressure through pressure control in a primary pressure maintaining step which is the initial stage after the switch to the pressure maintaining step has been made, and pressure reduction is controlled so that the reduced primary pressure reaches in a short time a set pressure for a secondary pressure maintaining step performed after the primary pressure maintaining step.
Description
technical field [0001] The present invention relates to a pressure control method in the pressure holding process immediately after injecting and filling molten resin into a cavity of a mold, and relates to a method capable of controlling with high precision the generation of thin materials such as light guide plates used in forming liquid crystal panels and other display panels. Method for controlling the residual stress in the packing process of an injection molding machine. Background technique [0002] In recent years, relatively small-sized liquid crystal displays have adopted light guide plates that uniformly surface-emit light. When molding such a thin plate such as a light guide plate, or in precision molding that requires high-precision molding, in order to eliminate the residual stress that occurs after filling the cavity with molten resin, it is required to transfer from a high-pressure state to Rapid decompression in a low pressure state, for example, when the d...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/77B29C45/50
CPCB29C45/77B29C2945/76006B29C2945/76384
Inventor 西崎贵政
Owner TOYO MACH & METAL CO LTD