US 5,342,189 A · Extrusion dies

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.

Claims30

Dependent claims

An insert type extrusion die comprising a plate-shaped male section coupled with a cylinder shaped female section held detachably in a die holder, for extruding a billet which is extruded by entering a die cavity from an entry-side to an exit-side of said die, said male section having a protrusion part, and said female section having a die cavity into which said protrusion part of said male section is insertingly disposed:

wherein said protrusion part of said male section is formed integrally with a male section main body and with an alignment part for aligning and locking the position of said male section with respect to said female section;
and
said female section includes said die cavity disposed on a billet chamber for holding an extrusion billet;
an exit region disposed at the exit-side of said die cavity and communicating therewith;
and a receiving groove for aligning and holding said male alignment part of said male section;
said male section further including a support region extending from said alignment part and in a direction from said entry-side toward said exit-side such that when said receiving groove receives said male alignment part, said support region extends into said female section immediately adjacent to a wall of said female section, whereby said male alignment part and said support region prevent relative movement between said male section and said female section.

3 more elements

An extrusion die insert to be detachably held by a die holder, said extrusion die insert comprising:

a female die of a generally cylindrical shape having opposite end surfaces and including a die cavity formed therein so as to open into one of said end surfaces and a discharge passageway communicated with said die cavity and opening into the other of said end surfaces, said female die including a fitting recess having a generally channel-shaped cross-section formed in said one end surface thereof;
and
a male die of a generally plate shape having opposite faces and an end face joining said opposite faces, said male die having a protrusion part formed on said end face, said opposite faces and said end face having portions defining a fitting portion, said male die being associated with said female die with said protrusion part being fitted in said die cavity and with said fitting portion being fitted in said fitting recess;
wherein said female die has an axis and includes a cross-shaped recess formed in said one end surface thereof and having first and second grooves intersecting each other at said axis, said first groove defining a billet chamber of a generally rectangular-shaped cross-section while said second groove serves as said fitting recess.

1 more element

Dependencies are inferred from the claim text.

Extrusion dies

Life of this patent

Extrusion dies

Life of this patent

Abstract

Claims30