A technique for providing assistance in setting the time to increase the clamping force is provided. A control device of an injection molding machine includes a clamping control part and a monitoring part. The clamping control part is configured to change, in a filling step of filling the inside of a mold device with a molding material during clamping, a set value of clamping force from a first set value to a second set value that is larger than the first set value, at a predetermined pressurizing timing in the middle of the filling step. The monitoring part is configured to monitor changes in the actual value of the clamping force due to changes in the set value of the clamping force.

A memory assembly (800), comprising: a storage media (802) tangibly embodying executable commands configured to direct a molding-system controller (114) to send a command signal to the first accumulator-control valve (106) and the first actuator control valve (110), the command signal configured to request: (i) the first accumulator-control valve (106) to permit flow of hydraulic fluid from the first accumulator assembly (108) to the first actuator assembly (112), and (ii) the first actuator control valve (110) to permit flow of hydraulic fluid from the first pump assembly (104) to the first actuator assembly (112) for the case where the molding-system controller (114) determines that the first actuator assembly (112) requires the flow from both the first pump assembly (104) and the first accumulator assembly (108) during a portion of a molding cycle.

The present invention enables injection by an injection device to be carried out in an early stage while obviating nozzle touch, and shortens the molding cycle of an injection stretch blow molding machine. In the present invention, an injection device 20, which is designed to perform injection when a value counted up by a timer reaches a set count value, is linked and fixed to a hot runner device 19 of an injection stretch blow molding machine 1. The count start point of the timer is set to: a stage in which a rotating plate rotates; a stage in which the rotating plate is made to stop rotating and is non-rotatably fixed; or a stage in which mold clamping of an upper mold and a lower mold begins.

A molding injection pressure Pi with which a parting opening Lm is formed between a movable mold 2m and a fixed mold 2c during injection-filling and which allows formation of a good molded article is obtained and set in advance. A molding clamping force Pc that allows formation of a good molded article is obtained and set in advance. During production, a mold clamping device Mc is clamped with the molding clamping force Pc, and an injection device Mi to apply the molding injection pressure Pi as a limit pressure Ps is driven to injection-fill a mold 2 with resin R. A parting opening detector 3 that detects the parting opening Lm is provided. During production, reset control is executed to reset the parting opening detector 3 to zero if reset timing tr set in advance has come at least on condition that given preparation for injection is completed after clamping. The reset timing is set in a range covering a given period Zs before injection start time and the given period Zs after the injection start time.

An injection molding method of a resin molded article closes a first die and a second die by a predetermined clamping force, conducts pressure holding and cooling after filling a cavity formed between the first die and the second die with a molten resin, and opens the first die and the second die. The injection molding method conducts clamping, filling, pressure holding, and cooling for the first die and the second die by a clamping force previously specified on the basis of a sample with which pressure in the cavity during a cooling process indicates a minimum and which is specified from samples of clamping forces.

A distortion sensor is provided on each of a plurality of tie bars and the extension amount of each tie bar is detected by the distortion sensor thereof, whereby a mold clamping force actually applied to a mold is measured. This measurement specifies the part of the mold that first opens and obtains a minimum mold clamping force that does not open the mold in that part. The minimum mold clamping force thus obtained is the minimum mold clamping force that does not open the mold without being influenced by factors such as the shape and the arrangement of a cavity in the mold and the mold clamping force balance of a mold clamping part of an injection molding machine.

This injection molding method uses an injection molding machine for two-material molding, which comprises a first mold part that is provided with a cavity and a second mold part that is provided with a cavity and is arranged in tandem with the first mold part. This injection molding method comprises: a first molding step wherein a material is injected into the cavity of the first mold part and the material in the cavity is compressed; and a second molding step wherein a material is injected into the cavity of the second mold part. A pressure, which is generated in the second mold part by injecting the material into the cavity in the second molding step, acts on the first mold part, and a compressive force is applied to the material in the cavity in the first molding step.

A control device for controlling an injection molding machine includes a mold device having a fixed mold and a movable mold; a mold clamping device to open and close the fixed and movable molds; and an injection device to inject a molding material into the mold device; and circuitry to acquire an allowable amount between the fixed and movable molds for preventing discharge of the injected molding material from the mold device, and acquire a gap size for discharging a gas between the fixed and movable molds, and adjust a mold clamping force of the mold clamping device such that a value obtained based on an opening size between the fixed and movable molds generated by injection of the molding material and the gap size satisfies a condition according to the allowable amount when the molding material is injected into the mold device closed by the mold clamping device.

An injection molding machine includes a mold clamping device configured to clamp a mold, an injection device configured to inject an injection material, and a plurality of air drive devices including at least two of: an air-driven clamper device mounted on the mold clamping device and configured to clamp and unclamp a mold; an air-driven platen drop preventing device configured to prevent a platen of the mold clamping device from dropping; and an air-driven shut-off nozzle device adapted to be provided in the injection device. At least two air valves configured to supply air to the air drive devices are provided at a same location, which is an air equipment mounting portion.

An injection molding machine includes: a mold clamping device including: a movable platen having a movable mold and a fixed platen having a fixed mold; and a toggle mechanism that moves the movable platen such that a mold device opens and closes, and disposes the movable platen in a mold clamping position; an injection device that injects molding material into cavity space between the movable mold in the mold clamping position and the fixed mold; and a control device that controls the mold clamping and injection devices. A cleaning process is performed, while the movable platen is at a burr-forming position and farther away from the fixed mold than at the mold clamping position, and the injection device injects the molding material into the mold device to mold an article with burrs. A toggle factor at the burr-forming position is a magnification factor of 1 or greater.