Body frame, and production process and apparatus thereof

Details Body frame, and production process and apparatus thereof Body frame, and production process and apparatus thereof

1990-03-23

1991-06-11

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164135, 164306, B22D 1804, B22D 1806

Patent

active

050224565

ABSTRACT:
A body frame for a motor bicycle includes a main frame, a head tube provided at a front end of the main frame and down tubes extending rearward from the main frame. The main frame, head tube and down tubes are cast with a light alloy into an integral form of a hollow and thin-wall structure. A production process of the body frame, wherein an integrally-formed core, which is formed into a shape similar to that of the body frame, is hollow and has good permability. A molten metal is charged into the mold and a vacuum is applied to the interior of the core. The molten metal is charged into a cavity defined between the core and the molding surface of the mold by a low-pressure casting method, and the molten metal is solidified so as to cast the body frame. A production apparatus of the body frame includes a liftable cope fitted to a vertical casting machine, a fixed drag, and slidable molds disposed in combination with the cope and being capable of horizontally sliding in a state that the cope is released from the drag. A body frame having both properties of light weight and high stiffness, and a production process and apparatus thereof is provided wherein casting defects and to provide a high-precision cast article, is provided.

REFERENCES:
patent: 2448632 (1948-09-01), Smith
patent: 4727922 (1988-03-01), Nakano
patent: 4824351 (1989-04-01), Ramsey

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