Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1995-03-06
2000-05-23
Ludlow, Jan
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
425145, 425150, B29C 4314, B29C 4358
Patent
active
06066276&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for editing and setting an injection speed corresponding to the position of an injection screw in an injection molding machine by a display screen and a data input device.
BACKGROUND ART
Conventionally known is an injection molding machine which is designed so that an overall screw movement section is divided into a plurality of subsections, an injection speed is set for each screw movement subsection; and injection operation is controlled to equalize the screw moving speed for each screw movement subsection to the injection speed for each subsection. However, the conventional injection molding machine has a problem in that the screw moving speed within equally divided sections remains constant regardless of the screw position, so that the injection speed changes by stages like a Gauss function, and thus it is hard for the speed to be changed smoothly.
In order for the injection speed to be changed smoothly by setting injection speeds by stages, it is necessary first to divide the screw movement section into considerably smaller subsections and then to assign different injection speeds individually to a number of smaller screw movement subsections obtained by the division, which is an extremely time-consuming task.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an injection speed editing/setting method for an injection molding machine, capable of easily and securely carrying out setting operation which is required for smooth injection speed changing.
In order to achieve the above object, according to one aspect of the present invention, (a) coordinates having two rectangular axes are displayed on a screen, one of the axes representing the position of a screw, the other representing the injection speed; (b) a section from a first screw position to a second screw position, out of an overall movement section of the screw, is defined as a first injection stage; (c) a first injection speed corresponding to the first screw position and a second injection speed corresponding to the second screw position are determined individually; (d) a point representing the relation of the first injection speed and the first screw position and a point representing the relation of the second injection speed and the second screw position are displayed as a starting point and an end point of the first injection stage, respectively, on the rectangular coordinates; (e) a line connecting the starting point and the end point of the first injection stage displayed on the screen is then selected out of a straight line and an arcuate curved line, a straight line connecting the starting point and the end point of the first injection stage is displayed if the straight line is selected, and data for a screw position and corresponding injection speed for giving an intermediate point between the starting point and the end point are inputted, whereby the inputted intermediate point is displayed on the coordinates, and a circular-arc curve connecting the starting point, an intermediate point and the end point are displayed on the coordinates when the circular-arc line is selected; (f) a second injection stage subsequent to the first injection stage, out of the overall movement section of the screw, is defined as a section from the second screw position to a third screw position; (g) the same processings as (c), (d) and (e) are successively executed, thereafter, for the second injection stage and the subsequent injection stages, and the processing for the final injection stage is finished; and (h) the resulting relations of the injection speeds and various screw positions within the overall screw movement section are set and stored in a storage device of a control device of an injection molding machine.
The first screw position and the second screw position of aforesaid (b), as well as the first injection speed and the second injection speed of aforesaid (c), relating to the first injection stage, and the similar screw positions and injection speeds rel
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Inoue Kouzo
Kamiguchi Masao
Neko Noriaki
Fanuc Ltd.
Ludlow Jan
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