Gate-cut and ejection control apparatus and control method for an injection molding machine

A gate-cut and ejection control method which is intended for use in an injection molding machine, wherein melted substance is injected into metallic molds by an injection cylinder at a single or multiple stages of speed and pressure set by electromagnetic flow control means and electromagnetic pressure control means and one or more than one ejector pin are operated by a hydraulic ejector unit to carry out a gate cut in said metallic molds and ejection of a product from said metallic molds, said gate-cut and ejection control method being characterised in that:

• after filling said melted substance into said metallic molds, said hydraulic ejector unit is supplied with said speed and said pressure set by said electromagnetic flow control means and said electromagnetic pressure control means so that said hydraulic ejector unit is operated at said speed and said pressure for carrying out a gate cut.

A gate-cut and ejection control method which is intended for use in an injection molding machine wherein one or more than one ejector pin is operated by an ejector member of an electric mechanism for carrying out gate cut in metallic molds and product ejection from said metallic molds, said method being characterised in that:

• said ejector member is operated at a comparatively high speed for gate cut and at a comparatively low speed for product ejection from said metallic molds.

A gate-cut and ejection control method which is intended for use in an injection molding machine wherein one or more than one ejector pin is operated by an ejector member of an electric mechanism for carrying out a gate cut in metallic molds and a product ejection from said metallic molds, said method being characterised in that:

• a gate cut is carried out by switching off error detecting means which cuts off a drive source if a difference between a target position and an actual position of an ejector member for operating said ejector pins exceeds a predetermined allowance;
• and
• a product ejection is carried out by switching on said error detecting means.

A gate-cut and ejection control apparatus which is intended for use in an injection molding machine wherein one or more than one ejector pin are operated by an ejector unit to carry out a gate cut in metallic molds and ejection of a product from the metallic molds,

• said gate-cut and ejection control apparatus being characterised by means for setting an ejector unit operation speed for a gate cut provided separately from means for setting an ejector unit operation speed for a product ejection.

A gate-cut and ejection control apparatus which is intended for use in an injection molding machine wherein melted substance is injected into metallic molds by an injection cylinder at a single or multiple stages of speed and pressure see by electromagnetic flow control means and electromagnetic pressure control means, and one or more than one ejector pin are operated by a hydraulic ejector unit to carry out a gate cut in said metallic molds and ejection of a product from said metallic molds, said gate-cut and ejection control apparatus being characterised by comprising:

• means provided for supplying said hydraulic ejector unit with the speed and the pressure set by said electromagnetic flow control means and said electromagnetic pressure control means after filling said melted substance into said metallic molds so that said hydraulic ejector unit is operated at said speed and said pressure for carrying out a gate cut.

A gate-cut and ejection control apparatus which is intended for use in an injection molding machine wherein one or more than one ejector pin is operated by an ejector member of an electric mechanism for carrying out gate cut in metallic molds and product ejection from said metallic molds, said apparatus being characterised by comprising:

• error detecting means which cuts off the drive source when a predetermined allowance is exceeded by a difference between an actual position and a target position set for said ejector member for operating said ejector pin;
• and
• error control means which switches off said error detecting means when a gate cut is to be carried out, and switches on said error detecting means when a product ejection is to be carried out.

In an injection molding machine having a metallic mold, having a gate-cut and ejection control apparatus with an ejector unit with at least one ejector pin to carry out a gate-cut in said metallic mold and ejection of a product from said metallic mold, wherein the improvement comprises said gate-cut and ejection control apparatus being characterized by means for setting an ejector unit operation speed for a gate-cut provided separately from means for setting an ejector unit operation speed for product ejection.