Mold clamping device and method of controlling mold clamping
A mold clamping device and mold clamping force technology, which is applied in the field of mold clamping device and mold clamping control, can solve problems such as mold clamping force overshoot, mold clamping force maintenance, and mold life shortening
Inactive Publication Date: 2010-08-18
SUMITOMO HEAVY IND LTD
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Problems solved by technology
In this way, when a current larger than the rated current is initially supplied to start mold clamping, there is a problem that if the supply current I is not properly controlled, not only the mold clamping force cannot be maintained at the target mold clamping force until the allowable time tp The force is within the allowable error range, and the overshoot of the clamping force occurs
In addition, the magnetic flux generated by the electromagnet is distributed, and it is difficult to control its behavior
[0015] It is also clear from the above characteristics of the electromagnet that it is difficult to fundamentally control the mold clamping force obtained by the electromagnet.
Therefore, even when there is a requirement to maintain the target mold clamping force within the allowable time, it is very difficult to avoid the above-mentioned overshoot, and excessive mold clamping force is applied to the mold for a long time.
As a result, the life of the die is shortened
Method used
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[0082] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Among them, in this embodiment, for the mold clamping device, the moving direction of the movable platen when the mold is closed is set as the front, and the moving direction of the movable platen when the mold is opened is set as the rear. The moving direction of the screw during measurement is described as the front, and the moving direction of the screw during measurement is described as the rear.
[0083] figure 2 It is a figure which shows the state at the time of mold closing of the mold apparatus and mold clamping apparatus in embodiment of this invention, image 3 It is a figure which shows the state at the time of mold opening of the mold apparatus and mold clamping apparatus in embodiment of this invention.
[0084] In the figure, 10 is the mold clamping device; Fr is the frame of the injection molding machine; Gd is two guides as the first guide me...
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A mold clamping device for applying mold clamping force by using an electromagnet has a mold clamping force detection section for detecting the mold clamping force, a supply current calculation section for calculating the value of an electric current supplied to the electromagnet, the calculation being based on an error between a target mold clamping force and the value of the mold clamping force detected by the mold clamping force detection section, and a limit section for suppressing the electric current value calculated by the supply current calculation section to a predetermined pattern. The mold clamping device can appropriately control mold clamping force obtained by the electromagnet.
Description
technical field [0001] The invention relates to a mold clamping device and a mold clamping control method. Background technique [0002] Conventionally, in an injection molding machine, a resin is injected from an injection nozzle of an injection device, filled into a cavity space between a fixed mold and a movable mold, and cured to obtain a molded product. In addition, a mold clamping device is provided for moving the movable mold relative to the above-mentioned fixed mold to perform mold closing, mold clamping, and mold opening. [0003] Among the mold clamping devices, there are hydraulic mold clamping devices driven by supplying oil to hydraulic cylinders and electric mold clamping devices driven by electric motors. However, the electric mold clamping devices have high controllability. , does not pollute the surroundings, and has high energy efficiency, so it is used more. In this case, the ball screw is driven to rotate to generate a thrust force, and the thrust forc...
Claims
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IPC IPC(8): B29C45/66B22D17/26B29C33/22B29C45/76
CPCB29C45/64B29C45/7653B29C2045/664B29C45/1751B29C2945/76234B22D17/26B29C2045/645B29C2945/76869B29C2945/76505B29C2945/76709B29C2945/76391B29C2945/76013B22D17/32
Inventor 森田洋加藤敦山本泰三柴田达也
Owner SUMITOMO HEAVY IND LTD