Provided are a control device and a control method for an injection molding machine that carries out a punching step with high reliability. A control device for an injection molding machine, the control device being equipped with: a mold opening/closing unit that integrally moves a fixed mold and a moving mold of a mold of the injection molding machine in the opening direction from a state where the mold is closed, thereby creating a gap between the fixed mold and a mounting plate; an insertion member control unit for inserting an insertion member into the gap; an assessment unit for assessing whether the insertion member has been inserted into the gap; and a push control unit for pushing out a punching pin when the insertion member has been assessed to have been inserted into the gap.

A method is provided to fabricate an injection molded piece with a weakened portion in an injection molding system having a cavity defined by a fixed mold part and a moveable mold part. The method comprises injecting raw material in a liquid state into the cavity to form the injection molded piece; moving a weakening insert into the injection molded piece from a first surface of the injection molded piece; injecting a gas to the first surface of the injection molded piece with a controlled pressure, wherein moving the weakening insert into the injection molded piece and injecting the gas are performed while the injection molded piece is in the liquid state.

A water pump has a pump housing 2 having therein a pump chamber 3; a drive shaft 7 rotatably supported in the pump housing 2; a pulley 5 having a flange wall 5a fixed to one end portion of the drive shaft 7, the pulley 5 being formed integrally with the drive shaft 7 with synthetic resin material containing glass fiber material 25; and an impeller 8 secured to the other end portion of the drive shaft 7 so as to be able to rotate integrally with the drive shaft 7, the impeller 8 being accommodated in the pump chamber 3. Six penetration holes 23 are formed at the flange wall 5a, and the glass fiber material 25 existing around the penetration hole 23 is oriented at random. With this, decrease in strength of the pulley can be suppressed.

A resin injection molding method uses a mold having a cavity and a hole-forming columnar body. The hole-forming columnar body is movable in an axial direction while extending through the cavity, and includes a first diameter portion having a first diameter, a second diameter portion having a diameter greater than the first diameter, and a tapered portion having a diameter gradually increasing from the first diameter portion toward the second diameter portion. The method includes moving the hole-forming columnar body in the axial direction such that at least one of the first diameter portion or the tapered portion is positioned in the cavity, injecting the molten resin to fill the cavity, maintaining an inside of the cavity under pressure, moving the hole-forming columnar body in the axial direction such that the second diameter portion is positioned in the cavity, and solidifying the injected filling molten resin.

This molding method involves: a first step in which a perforation pin (2) is made to protrude into a cavity (13) in a mold (1); a second step in which a molten resin (16) is injected to fill the cavity (13) so as to envelop the protruding part of the perforation pin (2); a third step in which, in a state in which the resin (16) is in an uncured state, the perforation pin (2) is made to protrude further; and a fourth step in which the resin (16) is cured to obtain a molded resin article.

A method is provided to fabricate an injection molded piece with a weakened portion in an injection molding system having a cavity defined by a fixed mold part and a moveable mold part. The method comprises injecting raw material in a liquid state into the cavity to form the injection molded piece; moving a weakening insert into the injection molded piece from a first surface of the injection molded piece; injecting a gas to the first surface of the injection molded piece with a controlled pressure, wherein moving the weakening insert into the injection molded piece and injecting the gas are performed while the injection molded piece is in the liquid state.

A resin injection molding method uses a mold having a cavity and a hole-forming columnar body. The hole-forming columnar body is movable in an axial direction while extending through the cavity, and includes a first diameter portion having a first diameter, a second diameter portion having a diameter greater than the first diameter, and a tapered portion having a diameter gradually increasing from the first diameter portion toward the second diameter portion. The method includes moving the hole-forming columnar body in the axial direction such that at least one of the first diameter portion or the tapered portion is positioned in the cavity, injecting the molten resin to fill the cavity, maintaining an inside of the cavity under pressure, moving the hole-forming columnar body in the axial direction such that the second diameter portion is positioned in the cavity, and solidifying the injected filling molten resin.

A water pump has a pump housing (2) having therein a pump chamber (3); a drive shaft (7) rotatably supported in the pump housing (2); a pulley (5) having a flange wall (5a) fixed to one end portion of the drive shaft (7), the pulley (5) being formed integrally with the drive shaft (7) with synthetic resin material containing glass fiber material (25); and an impeller (8) secured to the other end portion of the drive shaft (7) so as to be able to rotate integrally with the drive shaft (7), the impeller (8) being accommodated in the pump chamber (3). Six penetration holes (23) are formed at the flange wall (5a), and the glass fiber material (25) existing around the penetration hole (23) is oriented at random. With this, decrease in strength of the pulley (5) can be suppressed.

A two-stages hydraulic booster device for mold functional components includes a first hydraulic control one-way valve serially connected between the solenoid directional control valve and the pumping chamber of the supercharger via a first oil passage; a second hydraulic control one-way valve serially connected between the solenoid directional control valve and the pressure accumulating chamber of the supercharger via a second oil passage. The solenoid directional control valve simultaneously supplying oil to the first and second hydraulic control one-way valves via the first and second oil passages, respectively, and the pressure for opening the second hydraulic control one-way valve is larger than that of the first hydraulic control one-way valve, thereby moving the back pressure formed in the first oil passage to open the second hydraulic control one-way valve to drive the piston to transform the low pressure oil into high pressure oil to move the mold functional components.

A method for producing a component from a fiber-reinforced thermoplastic material referred to as an organometallic sheet, and which includes an arrangement of fibers embedded in a matrix of a thermoplastic material. To produce the component, the organometallic sheet is thermally shaped and then placed into an injection mold. A mold for carrying out a method for producing a component from a fiber-reinforced thermoplastic material is also provided.