Method of loading billet in the indirect extruding press

Abstract

A method of loading billet in the indirect extruding press for an alignment of the billet in which, after the billet (10) is held between the dummy block (11) at the side of the extruding stem (4) and the surface of the dies (6) of the dies stem (3), the container (1) is moved toward the side of the billet (10), thereby preventing the blockage of the billet and enabling the obtaining of pipes of a good roundness precision and a reduction in the thickness deflecting ratio of the pipes.

Description

Claims

1. A method of loading a billet in an indirect extruding press including a container movable along a direction of a central axis thereof, said container being fitted to a casing and having a container sleeve disposed therewithin, a die stem fixed to an end platen disposed at one side of said container, a die having a die surface and being provided at an end of said die stem opposite said end platen, an extruding stem disposed at the other side of said container opposite said die stem and movable along said axial direction of said container, respective central axes of said container sleeve, said die stem and said extruding stem being coaxial, a dummy block slidably insertable within and fitting said container sleeve, said dummy block being provided at one end thereof with a connecting portion for connecting said dummy block with a connecting end of said extruding stem, and a billet loader for supporting a billet to be loaded and said dummy block, said billet loader being movable in a direction transverse to said central axial direction of said container and disposed at said other side of said container, the method comprising the steps of:

moving said container toward and onto said die stem so that said die surface of said die is brought flush with an end of said container sleeve closest to said extruding stem;

supporting a billet to be loaded and said dummy block on said billet loader, said dummy block being located closest to said extruding stem with said connecting portion of said dummy block located closest to said end of said extruding stem, said billet being supported at a higher level than said dummy block so as to make respective central axes of said billet and said dummy block coaxial;

moving said billet loader into and within said indirect extruding press and opposite said die stem such that said central axes of said billet and dummy block supported thereupon are made coaxial with said central axis of said container sleeve and extruding stem;

moving said extruding stem toward said die stem to bring said connecting end of said extruding stem into connecting contact with said connecting portion of said dummy block;

further moving said extruding stem, having said dummy block connected therewith, toward said die stem until said billet is held with its central axis maintained coaxial with that of said container sleeve and between said die surface of said die on said die stem and said dummy block connected with said extruding stem, without said billet entering said container sleeve;

withdrawing said billet loader from said indirect extruding press; and

moving said container towards said extruding stem so as to load said billet and said dummy block into said container sleeve therewithin.

2. A method of loading a billet in an indirect extruding press including a container movable along a direction of a central axis thereof, said container being fitted to a casing and having a container sleeve disposed therewithin, a die stem fixed to an end platen disposed at one side of said container, a die having a die surface and being provided at an end of said die stem opposite said end platen, an extruding stem disposed at the other side of said container opposite said die stem and movable along said axial direction of said container, respective central axes of said container sleeve, said die stem and said extruding stem being coaxial, a dummy block slidably insertable within and fitting said container sleeve, and a billet loader for supporting a billet to be loaded and said dummy block, said billet loader being movable in a direction transverse to said central axial direction of said container and disposed at said other side of said container, the method comprising the steps of:

measuring the length of a billet to be loaded;

moving said container toward and onto said die stem so that said die surface of said die is brought flush with an end of said container sleeve closest to said extruding stem;

supporting said billet to be loaded and said dummy block on said billet loader, said dummy block being located closest to said extruding stem, said billet being supported at a higher level than said dummy block so as to make respective central axes of said billet and said dummy block coaxial;

moving said billet loader into and within said indirect extruding press and opposite said die stem such that said central axes of said billet and dummy block supported thereupon are made coaxial with said central axis of said container sleeve;

moving said extruding stem toward said die stem until a distance between said extruding stem and said die surface of said die on said die stem is equal to said measured length of said billet to be loaded and the length of said dummy block, so that said billet and dummy block are held with their said central axes maintained coaxial with that of said container sleeve and between said die surface of said die and said extruding stem with said dummy block being held to said billet by said extruding stem, and without said billet entering said container sleeve;

withdrawing said billet loader from said indirect extruding press; and

moving said container towards said extruding stem so as to load said billet and said dummy block into said container sleeve therewithin.

3. A method of loading a billet into an indirect extruding press in accordance with either claim 2 or 1, wherein said container is moved towards said extruding stem so as to load said billet and said dummy block into said container sleeve without contact occurring between said billet and said container sleeve.