US 5,704,411 AGranted

Method and system for heating ingot for metal injection molding

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsAtsushi Suzuki, Kazuya Sakamoto, Shinji Kazama, Nobumasa Hamazoe, Masayoshi Kai

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Abstract

A method for heating a metal ingot for a injection molding comprising steps of finding out a time in advance relating to the time required for heating up to a set temperature in a test by using a thermocouple and a timer in a test furnace, of heating the ingot to the set temperature by heating it for that period of time in an actual furnace and of measuring a temperature at that time by a radiation thermometer to reserve the temperature based on the measurement. Further, it comprises steps of detecting an oxygen concentration within an atmosphere of the heating chamber after evacuating the heating chamber of the metal ingot to fill with an inert gas and of controlling power fed to an induction heating coil to heat the metal ingot when the detected oxygen concentration within the atmosphere is below a predetermined value.

Claims2

Dependent claims

A method for heating an ingot for injection molding by heating the ingot while measuring a temperature thereof by a radiation thermometer,

said method comprising the steps of:
placing the ingot in a test furnace which is a same type of furnace as an actual furnace, and using a thermocouple as a first means for measuring a temperature of the ingot, and heating the ingot for a heating time t1 that ends when a measured value of said thermocouple reaches a set value;
placing said ingot in said actual furnace which is equipped with a radiation thermometer as a second means for measuring a temperature of the ingot, and heating the ingot to obtain a measured value T1 of said radiation thermometer when the ingot has been heated for a time equal to the heating time t1;
and continuing heating of said ingot by targeting the temperature T1 of said radiation thermometer as a temperature to be controlled, wherein the ingot is crushed to feed to a screw of an injection molding machine.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 08/621,839Filed 22 Mar 1996
Priority: JP 7-06319622 Mar 1995
Granted: 6 Jan 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C22B 9/003
General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals: by induction
B22D 2/006
Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass: for the temperature of the molten metal
B22D 17/30
Accessories: Details: accessories for supplying molten metal, e.g. in rations
B22D 17/32
Accessories: Details: controlling equipment

Family

No related US applications are recorded in the indexed filing history.

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