Apparatus for controlled injection of a molten material under pressure
AssigneeUbe Industries, Ltd.
InventorsUeno Toyoaki, Takayama Seizo, Hashimoto Kiyoshi, Uchida Masashi
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Abstract
A method of injecting a molten material such as molten metal or plasticizing resin under pressure and an apparatus performing the same wherein the piston speed of a cylinder for injecting the molten material is made to decrease before the mold cavity is filled up to the full with the molten material, thereby peak pressure generated in the molten material filled up to the full being eliminated and further pressure vibration occurred in a pressurized oil being obviated.
Claims18
A variable speed, liquid driven injection cylinder having first and second chambers with an inlet port coupled to said first chamber and an outlet port coupled to said second chamber, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said chambers, said injection cylinder further having (i) a piston head and an associated piston rod slidably disposed therein such that said piston rod extends out of said cylinder adjacent said second chamber, said piston head having an opening at one end thereof in axial alignment with a cavity located in said piston rod, said piston rod having a port adjacent said piston head;
- and (ii) a hollow tube coupled to said cylinder and disposed through said opening in said piston head and into said cavity and said piston rod, said hollow tube having a check valve at one end thereof and at least one port adjacent the other end, said piston head configured to selectively block said ports on said hollow tube as said piston rod slides out of said cylinder, whereby after said first and second chambers are filled with liquid, as further liquid is caused to enter said first chamber through said inlet port, liquid in said second chamber is initially prevented from exiting out of said outlet port and is caused to flow along a path through said port on said piston rod, each of said ports on said hollow tube, selectively through said check valve and into said first chamber, as the amount of liquid in said first chamber increases, said piston rod is caused to move out of said cylinder and whereby as the piston rod is caused to move out of said cylinder, each of said ports on said hollow tube are selectively blocked off by said piston head such that said liquid in said second chamber is prevented from traveling to said first chamber and is caused to flow out of said outlet port.
An injection apparatus for use in an injection molding system comprising an injection cylinder having an inlet port and an outlet port adapted to selectively permit the flow of a liquid into and out of said cylinder, said injection cylinder further having first and second ends with a piston slidably disposed therein and extending out of said first end thereof, and a hollow tube coupled to said piston and extending out of said second end of said injection cylinder, said hollow tube having at least one port and said piston having blocking means for blocking off each said port on said hollow tube as said piston slides in said cylinder whereby as liquid is caused to flow into said injection cylinder through said inlet port, said piston is caused to slide in said cylinder said liquid being initially permitted to flow through each said port on said hollow tube and is then prevented therefrom as each said port engages said blocking means.
An injection apparatus for use in an injection molding system comprising an injection cylinder having a first end with an outlet port and a second end with an inlet port, said inlet and outlet ports adapted to selectively permit the flow of a liquid into and out of said injection cylinder, said injection cylinder further having a piston slidably disposed in a cavity formed in said injection cylinder and extending outwardly from said first end thereof, a casing coupled to said injection cylinder and having a slidable rod member disposed in a cavity formed in said casing and extending outwardly therefrom, said rod member and said piston being coupled together, said casing further having a passage joining said cavity in said casing with said cavity in said injection cylinder such that when a liquid is injected into said injection cylinder adjacent said second end thereof, said piston is caused to slide in said injection cylinder which, in turn, causes said rod member in said casing to slide in said casing.
An injection cylinder for injecting a molten material into a mold comprising
- a. an elongated, hollow injection cylinder having a first and second end with a first port adjacent the first end thereof and a second port adjacent the second end thereof, said first and second ports adapted to selectively permit the flow of a liquid into and out of said injection clyinder,
- b. a piston and associated piston rod slideably disposed in said injection cylinder and extending out of first end thereof, said piston and rod forming an elongated cavity opening into said injection cylinder, said piston and rod further having at least one port adjacent the end disposed within said injection cylinder;
- c. a hollow tube coupled to said second end of said injection cylinder and slideably extending into said cavity in said piston and piston rod, said tube having at least one port adjacent the end extending into said cavity and a valve at the opposite end of said tube;
- d. throttling means coupled to said injection cylinder adjacent said first and second ports for controlling the flow of said liquid into and out of said injection cylinder.
An injection apparatus for use in an injection molding system comprising an injection cylinder having first and second cavities formed therein and having an outlet port adjacent a first end and an inlet port adjacent a second end of said injection cylinder, said injection cylinder further having a piston slideably disposed in said cavity and extending out of said first end of said injection cylinder, a hollow tube formed integrally with said piston and extending toward said second end of said injection cylinder and into said second cavity, said tube having at least one port adjacent said second end of said injection cylinder, a passage joining said second cavity in said injection cylinder with said first cavity, a check valve disposed in said passageway so as to regulate the flow of said liquid in said injection cylinder, and means disposed in said injection cylinder for selectively blocking said ports on said tube as said tube slides in a predetermined direction in said injection cylinder.
Dependencies are inferred from the claim text.