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US 12,172,352 B2Granted
Screw for injection molding machine, injection device, and injection molding machine
AssigneeThe Japan Steel Works, Ltd.
InventorsYugo Kashiwabara, Takuya Yufu, Kazuma Nakagawa
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Abstract
A stepped flight is formed on a screw of an injection molding machine. The stepped flight is a flight in which a step-shaped step portion is formed on a top portion thereof. The top portion of the flight includes a large diameter portion on an upstream side and a land portion on a downstream side. When a gap ratio m of a gap H1 between the land portion and a bore of the heating cylinder to a gap H2 between the large diameter portion and the bore is defined as H1/H2, the gap ratio m is selected to be 2.3≤m≤6.4.
Claims12
An apparatus comprising:
- a cylinder having a bore;
- and
- a screw that is insertable into the bore of the cylinder, the screw comprising:
- a flight,
- wherein a step-shaped step portion is formed on a top portion of the flight of a part of the screw, and the flight on which the step-shaped step portion is formed is a stepped flight;
- wherein the stepped flight includes a large diameter portion on an upstream side and a land portion on a downstream side, and
- wherein a gap ratio m=H1/H2 is 2.3 or more and 4.33 or less,
- wherein gap H1 is the distance between the land portion and the bore,
- wherein gap H2 is the distance between the large diameter portion and the bore,
- wherein for a flight width B1 in a direction perpendicular to a lead angle and a width B2 of the land portion in the stepped flight, the width B2 is 0.5 times or more and 0.95 times or less of the width B1, and
- wherein the flight width B1 and the width B2 of the land portion in the stepped flight are directed from downstream to upstream of the screw.
8 more elements
An injection device, comprising:
- a heating cylinder having a bore;
- and
- a screw,
- wherein in the screw, a step-shaped step portion is formed on a top portion of a flight of a part of the screw, the flight of a part of the screw is formed to be a stepped flight,
- wherein the stepped flight includes a large diameter portion on an upstream side and a land portion on a downstream side, and
- wherein a gap ratio m=H1/H2 is 2.3 or more and 4.33 or less,
- wherein gap H1 is the distance between the land portion and the bore,
- wherein gap H2 is the distance between the large diameter portion and the bore,
- wherein for a flight width B1 in a direction perpendicular to a lead angle and a width B2 of the land portion in the stepped flight, the width B2 is 0.5 times or more and 0.95 times or less of the width B1, and
- wherein the flight width B1 and the width B2 of the land portion in the stepped flight are directed from downstream to upstream of the screw.
7 more elements
An injection molding machine comprising:
- A mold clamping device configured to clamp a mold, the mold clamping device including a fixed plate, a moveable plate, a mold clamping house, and a mold clamping mechanism formed of a toggle mechanism, the mold including a movable-side mould provided on the fixed plate and a fixed-side mold provided on the moveable plate, and the mold clamping mechanism being driven to clamp the fixed-side mold and the movable-side mold;
- and
- an injection device including a heating cylinder having a bore and a screw, the injection device being configured to inject an injection material into the mold,
- wherein a step-shaped step portion is formed on a top portion of a flight of a part of a screw to be a stepped flight,
- wherein the stepped flight includes a large diameter portion on an upstream side and a land portion on a downstream side, and
- wherein a gap ratio m=H1/H2 is 2.3 or more and 4.33 or less,
- wherein gap H1 is between the land portion and the bore;
- wherein gap H2 is the distance between the large diameter portion and the bore,
- wherein for a flight width B1 in a direction perpendicular to a lead angle and a width B2 of the land portion in the stepped flight, the width B2 is 0.5 times or more and 0.95 times or less of the width B1, and
- wherein the flight width B1 and the width B2 of the land portion in the stepped flight are directed from downstream to upstream of the screw.
7 more elements
Dependencies are inferred from the claim text.