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US 11,433,586 B2Granted
Injection mold and manufacturing method
AssigneeKonica Minolta, Inc.
InventorTakahiro Mizukane
Life of this patent
Estimating the term…
Abstract
At a temperature at the time of molding, an end surface of an ejector pin in a sliding direction is as high as or higher than an upper surface of an upper surface portion of a mold body, the upper surface being adjacent to a cavity on the ejector pin side.
Claims8
An injection mold comprising:
- a mold body that includes a fixed-side member and a movable-side member and in which a cavity is formed;
- and an ejector pin,
- wherein said mold body and said ejector pin have linear expansion coefficients different from each other,
- at a temperature at a time of molding,
- an end surface of said ejector pin on said cavity side in a sliding direction is as high as or higher than an adjacent surface of said movable-side member, said adjacent surface being adjacent to said cavity,
- the injection mold further comprises:
- a support member that supports said mold body and has the same linear expansion coefficient as the linear expansion coefficient of said ejector pin;
- and
- a spacer that is provided below said ejector pin, adjusts a height of said end surface of said ejector pin, and has the same linear expansion coefficient as the linear expansion coefficient of said ejector pin,
- wherein a thickness t of said spacer is:
- t≥L1×(A−B)×(Tm−Ta),
- where a temperature at a time of mold assembly is Ta, the temperature at the time of molding is Tm, the linear expansion coefficient of said mold body is A, the linear expansion coefficient of each of said ejector pin, said support member, and said spacer is B, a length of said ejector pin at the temperature at the time of mold assembly in a region where the linear expansion coefficient differs between said ejector pin and said mold body in said sliding direction is L1, and a length of said ejector pin at the temperature at the time of mold assembly in a region where the linear expansion coefficient coincides between said ejector pin and said support member in said sliding direction is L2.
9 more elements
An injection mold comprising:
- a mold body that includes a fixed-side member and a movable-side member and in which a cavity is formed;
- and an ejector pin,
- wherein said mold body and said ejector pin have linear expansion coefficients different from each other,
- at a temperature at a time of molding,
- an end surface of said ejector pin on said cavity side in a sliding direction is as high as or higher than an adjacent surface of said movable-side member, said adjacent surface being adjacent to said cavity,
- the injection mold further comprises a support member that supports said mold body and has the same linear expansion coefficient as the linear expansion coefficient of said ejector pin, and
- a length L of said ejector pin at a temperature at a time of mold assembly is:
- L≥L1+L2+L1×(A−B)×(Tm−Ta),
- where the temperature at the time of mold assembly is Ta, the temperature at the time of molding is Tm, the linear expansion coefficient of said mold body is A, the linear expansion coefficient of each of said ejector pin and said support member is B, a length of said ejector pin at the temperature at the time of mold assembly in a region where the linear expansion coefficient differs between said ejector pin and said mold body in said sliding direction is L1, and a length of said ejector pin at the temperature at the time of mold assembly in a region where the linear expansion coefficient coincides between said ejector pin and said support member in said sliding direction is L2.
6 more elements
Dependencies are inferred from the claim text.