RU2291024C2 - Method for producing fastening nuts for automobile wheels - Google Patents

Abstract

FIELD: plastic working of metals, possibly manufacture of fastening parts.

SUBSTANCE: method comprises steps of cutting off measured -length blank; upsetting it and forming outer polygon; forming cone outer working surface and simultaneously chamfering transition portion between polygon and nut end; then forming opening for thread at basing blank according to cone surface formed beforehand. Stainless steel of martensite-ferrite class containing carbon, chrome, nickel, silicon, manganese, iron is used as blank material at next relation of ingredients, mass %: carbon, 0.11 - 0.17; chrome, 0.14 - 0.40; nickel, 1.5 - 3.0; silicon, no more than 0.8; manganese, no more than 0.8' iron, the balance. Outer surface of nut is subjected to electrochemical polishing.

EFFECT: increased wear resistance, improved quality of nuts operating in aggressive media.

2 cl, 2 dwg

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of fasteners.

HIGH-STRENGTH STAINLESS STEEL AND PRODUCT PERFORMED FROM IT ARE Known (RF Patent No. 2061781, IPC С 22 С 38/40, 06/10/1996). These inventions relate to the field of metallurgy, in particular to the composition of stainless chromium-nickel steel of high strength and ductility, as well as to the product made from it, and can be used in the manufacture of cold-rolled tape, strip, sheet, high-strength wire and ropes, springs, medical instruments , cutting tools, fasteners, structural parts, etc.

A SELF-LOCKING ANCHOR NUT OF TITANIUM ALLOYS (RF patent No. 2164630, IPC F 16B 37/00, 37/04, 37/06, 03/27/2001) is also known, which contains a support sole made of titanium alloys and equipped with a main hole a hexagonal shape and rivet holes, and a housing located in the main hole with a support flange and an overflange part in the form of a hexagon, the ribs of which are axially deformed to the stop in the sole.

Known for HIGH STRENGTH STAINLESS STEEL AND PRODUCT PERFORMED FROM IT (RF patent No. 94023194, IPC C 22 C 38/40, 04/10/1996). These inventions relate to compositions of stainless chromium-nickel steels of high strength and ductility, as well as to products made from them, and can be used in the manufacture of cold-rolled tape, strip, sheet, high-strength wire and ropes, springs, medical instruments, cutting tools, fasteners, structural details, etc. Steel contains, wt.%: Carbon 0.15-0.45, chromium 12.0-16.5, nickel 3.0-5.0, iron and impurities - the rest. High-strength corrosion-resistant products are made of steel of the specified composition. The invention provides corrosion-resistant steel and products from it.

Known METHOD FOR PRODUCING A WHEEL NUT (RF Patent No. 2209703, IPC 21 K 1/70, 08/10/2003). The method includes the following operations: cutting a measured workpiece, draft, extruding a preliminary hole for threading, preliminary and final formation of the outer working surface of the cone polyhedron. This technical solution can be considered as a prototype to the declared.

The technical task is to increase the wear resistance and quality of the products obtained, operated in aggressive environments.

To solve the problem in a known method of manufacturing fastening nuts for automobile wheels, including cutting a measured billet, forming an external polyhedron, then producing a conical outer working surface with simultaneous chamfering at the transition from the polyhedron, forming a hole for a thread based on a conical external working surface and tapping, in accordance with the invention, the martensitic-ferritic class stainless steel is used as the workpiece material CA, containing carbon, chromium, nickel, silicon, manganese, iron in the following ratio, wt.%:

Carbon - 0.11-0.17

Chrome - 0.14-0.40

Nickel - 1.5-3.0

Silicon - not more than 0.8

Manganese - not more than 0.8

Iron - Else

the formation of the outer polyhedron is carried out by draft of the workpiece, and the chamfer is formed at the transition from the polyhedron to the end.

In addition, electrochemical polishing of the outer surface of the nut is performed.

The invention is illustrated by graphic materials, where figure 1 shows a nut, figure 2 is the same side view.

Positions marked: 1 - body, 2 - outer polyhedron, 3 - conical outer working surface, 4 - hole for threading, 5 - chamfer, 6 - end face, 7 - thread.

A method of manufacturing fastening nuts for automobile wheels consists in cutting a measured workpiece, stamping it with a draft to form an external polyhedron 2, subsequent machining of the conical outer working surface 3, forming a hole 4 for threading, machining the conical surface with simultaneous chamfering 5 at the transition of the polyhedron 2 to the end face 6, after which the thread 7 is cut. Stainless steel of a martensite-ferrite valve is used as the workpiece material sa.

Next, the outer surface of the nut is processed using electrochemical polishing.

Claims (2)

1. A method of manufacturing fastening nuts for automobile wheels, including a cut off of a measured blank, forming an external polyhedron, then producing a conical outer working surface with simultaneous chamfering at the transition from the polyhedron, forming a hole for a thread based on a conical external working surface, and threading, characterized the fact that the billet material is stainless steel of the martensitic-ferritic class containing carbon, chromium, nickel, silicon, manganese C, iron in the following ratio of components, wt.%: Carbon 0.11-0.17 Chromium 0.14-0.40 Nickel 1.5-3.0 Silicon No more than 0.8 Manganese No more than 0.8 Iron Rest the formation of the outer polyhedron is carried out by draft of the workpiece, and the chamfer is formed at the transition from the polyhedron to the end. 2. The method according to claim 1, characterized in that they produce electrochemical polishing of the outer surface of the nut.

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