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US 12,679,015 B2Granted
Injection molding machine for foam molding and method for controlling injection molding machine
AssigneeThe Japan Steel Works, Ltd.
InventorsAkihiro Naito, Takuya Yufu
Life of this patent
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Abstract
An injection molding machine includes a heating cylinder having a gas inlet, a screw, a gas cylinder, a pressure reducing valve configured to reduce a primary pressure of a gas from the gas cylinder to a secondary pressure, a gas supply portion configured to supply the gas at the secondary pressure to the gas inlet, an injection material pressure detection device configured to detect an injection material pressure in a vicinity of the gas inlet, and a controller. The controller is configured to detect an abnormality by comparing the injection material pressure with the secondary pressure.
Claims18
An injection molding machine comprising:
- a heating cylinder having a gas inlet;
- a screw drivable in the heating cylinder;
- a gas supply configured to supply a gas to the gas inlet;
- an injection material pressure detector provided in a vicinity of the gas inlet of the heating cylinder;
- and
- a controller,
- wherein an inside of the heating cylinder is divided into a plurality of sections according to a shape of the screw, and includes, from upstream to downstream, a first compression and metering section in which an injection material is melted and compressed, a starvation section in which a pressure of the molten injection material decreases, and a second compression and metering section, and wherein the injection material pressure detector are provided in the starvation section,
- wherein the gas supply includes:
- a gas supply source configured to supply a gas;
- and
- a pressure adjustment regulator configured to reduce and adjust a primary pressure of a gas from the gas supply source to a secondary pressure,
- wherein the gas supply is configured to supply the gas at the secondary pressure to the gas inlet, and
- wherein the controller is configured to detect an abnormality based on whether an injection material pressure detected by the injection material pressure detector is within a normal pressure range, the normal pressure range greater than a value that is obtained by subtracting a second threshold from the secondary pressure and being less than a value that is obtained by adding a first threshold to the secondary pressure, the first threshold being larger than 0.1 MPa, and the second threshold being larger than 0.1 MPa.
10 more elements
An injection molding machine comprising:
- a heating cylinder having a gas inlet;
- a screw drivable in the heating cylinder;
- a gas supply configured to supply a gas to the gas inlet;
- an injection material pressure detector provided in a vicinity of the gas inlet of the heating cylinder;
- and
- a controller,
- wherein the gas supply includes:
- a gas supply source configured to supply a gas;
- and
- a pressure adjustment regulator configured to adjust a primary pressure of a gas from the gas supply source to a secondary pressure,
- wherein the gas supply is configured to supply the gas at the secondary pressure to the gas inlet, and
- wherein the controller is configured to detect an abnormality by comparing an injection material pressure detected by the injection material pressure detector with the secondary pressure,
- wherein the injection molding machine further comprises an injection material detector configured to confirm a supply of an injection material to the heating cylinder, and
- wherein in a case where the injection material is interrupted and an injection material shortage is detected, the controller executes molding cycle stop processing.
11 more elements
An injection molding machine comprising:
- a heating cylinder having a gas inlet;
- a screw drivable in the heating cylinder;
- a gas supply configured to supply a gas to the gas inlet;
- an injection material pressure detector provided in a vicinity of the gas inlet of the heating cylinder;
- and
- a controller,
- wherein the gas supply includes:
- a gas supply source configured to supply a gas;
- and
- a pressure adjustment regulator configured to adjust a primary pressure of a gas from the gas supply source to a secondary pressure,
- wherein the gas supply is configured to supply the gas at the secondary pressure to the gas inlet, and
- wherein the controller is configured to:
- detect an abnormality by comparing an injection material pressure detected by the injection material pressure detector with the secondary pressure;
- detect an abnormality of the injection material pressure based on relationship between a normal pressure range and a predetermined condition, the normal pressure range being a normal pressure range of the injection material pressure;
- and
- based on detecting the abnormality of the injection material pressure, perform supply amount reduction control including reducing a supply amount of an injection material by controlling a feeder, and
- wherein a molding cycle stop processing is processing of waiting for completion of a molding cycle being executed and stopping the molding cycle.
14 more elements
Dependencies are inferred from the claim text.