Title of Invention

"METHODS FOR THE COLD EXTRUSION OF METALLIC ELEMENTS WITH DEAD OR THROUGH HOLES AND PLANT FOR CARRYING OUT SAID METHODS."

Abstract Cold extrusion procedures for obtaining metal elements such as for example bushings, nuts or other elements with dead or through holes, screws, standard and special shape extruded or pressed products, etc. on a machining centre comprising a series of hydraulic presses connected to each other with an automatic movement system. The final drilling or shearing of the elements is advantageously carried out by a dedicated drilling or shearing unit, working at high speed, which can consist of a vertical mechanical press. The use of the plant comprising several hydraulic presses together with the rapid drilling or shearing unit makes it possible to achieve a high level of productivity (FUGURE 4)
Full Text "METHOD FOR THE COLD EXTRUSION ON HYDRAULIC PRESSES OF METALLIC ELEMENTS SUCH AS BUSHES, NUTS OR OTHER ITEMS WITH DEAD OR THROUGH HOLES, SCREWS, STANDARD- OR SPECIAL SHAPED EXTRUDED OR PRESSED ITEMS, AND PLANT FOR CARRYING OUT SAID METHODS"
TECHNICAL FIELD
The present invention concerns procedures for the cold extrusion on hydraulic presses of metal elements.
More specifically, the present invention refers to cold extrusion procedures for the production of metal elements such as for example bushings, nuts or other elements with dead or through holes, screws, standard and special shape extruded or pressed products, etc.
These cold extrusion procedures can be carried out by means of a plant comprising a series of hydraulic presses connected to each other with an automatic movement system and the resulting products generally consist of bushings, nuts or other elements with dead or through holes, screws, standard and special shape extruded or pressed products, etc. made from steel, regardless of the type and resistance class of the steel, or from other metal materials (aluminium, copper, brass) with an external diameter indicatively greater than 30 mm.
The present invention can be applied in the mechanical industry sector for the production of medium-high quantity batches.
BACKGROUND ART
It is known that the production of tubular metal elements such as, for example, bushings substantially takes plaice according to four possible procedures:






We claim:
1. Method for the cold processing of tubular metal elements or other elements with dead or through holes, nuts, having a diameter greater than 30 mm, comprising the following machining stages:
setting up and preparation of a blank (10) in rolls or bars of full metal material;
straightening, in the case of a blank in rolls, and cutting of the metal material (10)
into pieces of a determined length;
pressing in sequence achieved by passing these pieces sequentially through a
plurality of work stations (31) of a work centre consisting of several hydraulic
presses in order to obtain a blank element presenting one dead hole or a blank
element presenting two longitudinally opposite dead holes (19) separated by a
central transverse section (20);
in the case of the blank element presenting the two longitudinally opposite dead
holes the through drilling of the blank by removal of this central traverse section
(20).
2. Method for the cold processing of metal elements such as standard and special shape extruded or pressed screws, having a diameter greater than 30 mm, comprising the following machining stages:
setting up and preparation of a blank (10) in rolls or bars of full metal material; straightening, in the case of a blank in rolls, and cutting of this metal material (10) into pieces of a determined length;
pressing in sequence achieved by passing these pieces sequentially through a plurality of work stations (31) of a multi-hydraulic-press plant in order to obtain a finished element (20) with or without swarf or waste.
3. Method as claimed in any one of the claims 1 and 2, in which the setting up and preparation of the full blank (10) differs according to the metal material used.
4. Method as claimed in claim 3, carried out on material consisting of stainless steel, wherein the stainless steel is initially treated by solution annealing and pickled in a balanced solution of sulphuric acid, hydrofluoric acid, potassium permanganate and hydrogen peroxide, and subsequently washed repeatedly by means of immersion in a salting tank in order to facilitate the pressing.
5. Method as claimed in claim 3, carried out on material consisting of low-alloy steel, wherein the said material is pickled in sulphuric acid and subsequently washed in a phosphating tank in which, by chemical reaction, a layer of zinc phosphate is created on the surface of the piece, then immersed in a sodium stearate tank where, again by chemical reaction, a thin layer of zinc stearate forms on top of the previous layer of zinc phosphate.
6. Method as claimed in claim 2, wherein the products undergo shearing, for example for hexagonal-head screws, can be carried out by means of a mechanical press.
7. Method as claimed in any one of the claims from 2 to 6, carried out on starting material in the form of rolls, in which the previously washed metal material is straightened by loading it on a wire-straightening unit designed to unroll the skein.
8. Method as claimed in any one of the claims from 2 to 6, carried out on starting material in the form of bars, in which these bars are loaded in bundles in a bar sectioning plant and in which the bars are presented at the cutting station in a synchronised way according to the needs of the machining centre consisting of the hydraulic presses.
9. Method as claimed in claim 7, in which the free end of the roll is pulled through a first set of rollers and then through a system of opposite rollers designed to straighten the wire and transfer it to a cutting unit.
10. Method as claimed in any one of the claims 8 and 9, in which the material is cut into pieces of a predetermined length, advantageously by various possible procedures such as for example mechanical or hydraulic processes by means of one or mobile blades or by a circular saw.
11. Method as claimed in any one of the preceding claims, wherein the plant or machining centre (30) consists of a series of hydraulic presses of various sizes and power levels (31-34) connected by a transfer unit designed to move the pieces (10) being machined.
12. Method as claimed in claim 11, wherein the transfer unit consists of a series of gripper units (40-44) powered by an appropriate source of energy.
13. Method as claimed in any one of the preceding claims, wherein the drilling or shearing is carried out by a special unit consisting of a vertical press.
14. Method as claimed in claim 13, wherein the vertical press consists of a mechanical press.
15. Method as claimed in any one of the preceding claims wherein that the functioning and synchronisation of the individual presses and of the transfer unit are controlled by a PLC or a microprocessor.
16. Plant for the implementation of a procedure as claimed in any one of the preceding claims, wherein it comprises a series of hydraulic presses adjacent to each other, designed to carry out a successive series of pressing operations on pieces to be machined which are transferred from one press to another by means of appropriate automated manipulators.
17. Plant as claimed in claim 16, wherein it also comprises a drilling or shearing station.
18. Plant as claimed in claim 17, wherein the drilling or shearing station consists of a vertical mechanical press.

Documents:

1943-DELNP-2004-Abstract (24-11-2009).pdf

1943-DELNP-2004-Claims (24-11-2009).pdf

1943-DELNP-2004-Claims-(01-03-2011).pdf

1943-DELNP-2004-Correspondence-Others (24-11-2009).pdf

1943-DELNP-2004-Correspondence-Others-(01-03-2011).pdf

1943-DELNP-2004-Description (Complete) (24-11-2009).pdf

1943-DELNP-2004-Description (Complete)-(01-03-2011).pdf

1943-DELNP-2004-Form-1-(01-03-2011).pdf

1943-DELNP-2004-Form-2-(01-03-2011).pdf

1943-DELNP-2004-Form-3 (24-11-2009).pdf


Patent Number 247572
Indian Patent Application Number 1943/DELNP/2004
PG Journal Number 17/2011
Publication Date 29-Apr-2011
Grant Date 21-Apr-2011
Date of Filing 06-Jun-2004
Name of Patentee AMAFA SERVICE SRL,
Applicant Address VIA LAZZARETI, 2/A, I-42100 REGGIOEMILIA, ITALY.
Inventors:
# Inventor's Name Inventor's Address
1 VESCOVINI ALESSANDRO, VIA DEI BAGNI, 26, 1-34074 MONFAL-CONE, ITALY.
PCT International Classification Number B21K1/68
PCT International Application Number PCT/IT03/00106
PCT International Filing date 2003-02-26
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 VR2002A000118 2002-11-12 Italy