Extrusion dies

Details Extrusion dies Extrusion dies

1992-10-01

1994-08-30

Bushey, Charles S.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

425467, 425468, B29C 4700

Patent

active

053421892

ABSTRACT:
An insert type extrusion die is presented for making small parts for use in electrical, automotive and other industries for manufacturing small component parts. The application of the invented die is illustrated for making multi-cavity flat aluminum tubes, which are used for small heat exchanger components, in automotive air-conditioners, condensors and radiators. The insert die is composed of a male die section having a protrusion part and a female die section having a die cavity is held detachably in a die holder. The male section is a roughly rectangular plate-shaped component, and has an integrally formed twist prevention region which is inserted into the receiver groove of the female section which is integrally formed thereon. The protrusion part defines the cavity shape of the multi-cavity flat tube, and the female section has the die cavity of the required cross sectional shape to define the outer shape of the tube. Because the male section is made as a small independent part, the male section is not only replaceable readily, but the extrusion pressure is low because the port area can be made large compared with the insert dies of the conventional type. The invented insert die is therefore durable and retains the original mechanical precision of a new die during its long service life. The cost of manufacturing the insert die is low because the male section is simple shaped and can be fabricated by such precision fabrication techniques as electric discharge machining.

REFERENCES:
patent: 353681 (1886-12-01), Hurlbut
patent: 1725959 (1929-08-01), Heath
patent: 3227103 (1966-01-01), Schafer
patent: 3255487 (1966-06-01), Nieuwenhuysen
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patent: 3778217 (1973-12-01), Bustamante et al.
patent: 3923444 (1975-12-01), Esper et al.
patent: 4113411 (1978-09-01), Terragni
patent: 4668176 (1987-05-01), Zeibig et al.
patent: 4820146 (1989-04-01), Inoue et al.
patent: 5061163 (1991-10-01), Kennedy

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