EP0028985A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method for making fasteners by drawing a cold wire or rod
Assignee: Union Carbide Corp
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Filing: 1980-11-07
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Granted: —
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Expires: 2000-11-07
Abstract
Abstract The invention deals with a method for making fasteners by drawing a cold wire or rod. <??>The method aocording to the invention for making a fastener having a head and a shank horn wire or rod consisting essentially of AISI 200 or 300 series stainless steel comprises the following steps: (a) cooling the wire or rod to a temperature of less than about minus 75 DEG C; (b) drawing the cold wire or rod through a die at a strain sufficient to provide a tensile strength for the wire or rod in the range of about 517 MPa to about 1,104 MPa, the strain and the die size being such that the area of the wire or rod will be reduced by at least about 3 percent; and (c) dividing the wire or rod into slugs and cold heading each slug to provide the fastener.
Inventors
- 👤 William Alphonse Kilinskas
- 👤 Ronald Joseph Selines
- 👤 Jaak Stefaan Van Den Sype
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 07:53
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/10; C21D8/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
1 A method for making a fastener having a head and a shank from wire or rod consisting essentially of AISI 200 or 300 series stainless steel comprising the following steps: (a) cooling the wire or rod to a temperature of less than about minus 75°C; (b) drawing the cold wire or rod through a die at a strain sufficient to provide a tensile strength for the wire or rod in the range of about 517 MPa to about 1,104 MPathe strain and the die size being such that the area of the wire or rod will be reduced by at least about 3 percent; and (c) dividing the wire or rod into slugs and cold heading each slug to provide the fastener.
Claim 2
Dependent Claim
123 words
1 A method for making a fastener having a head and a shank from wire or rod consisting essentially of AISI 200 or 300 series stainless steel comprising the following steps: (a) cooling the wire or rod to a temperature of less than about minus 75°C; (b) drawing the cold wire or rod through a die at a strain sufficient to provide a tensile strength for the wire or rod in the range of about 517 MPa to about 1,104 MPathe strain and the die size being such that the area of the wire or rod will be reduced by at least about 3 percent; and (c) dividing the wire or rod into slugs and cold heading each slug to provide the fastener.
Claim 3
Dependent Claim
71 words
The method defined in claim 1 wherein the initial Md 30 temperature of the wire or rod is in the range of about minus 50°C to about 50°C and the initial tensile strength of the wire or rod is in the range of about 485 MPa to about 863 MPa,and the tensile strength provided in step (b) is higher than the tensile strength of the wire or rod entering step (b).
Claim 4
Dependent Claim
15 words
The method defined in claim 1 wherein the initial wire or rod is cold drawn.
Claim 5
Dependent Claim
12 words
The method defined in claim 1 wherein the initial wire is annealed.
Claim 6
Dependent Claim
50 words
The method defined in claim 1 wherein in step (b): (i) the reduction in area of the wire or rod is in the range of about 3 to about 25 percent; and (ii) the tensile strength after such reduction is in the range of about 621 to about 1,104 MPa.
Claim 7
Dependent Claim
26 words
The method defined in claim 1 wherein, after step (c), the fastener is aged at a temperature in the range of about 400°C to about 450°C.
Claim 8
Dependent Claim
18 words
The method defined in claim 1 wherein the temperature in step (a) is less than about minus 100°C.
Claim 9
Dependent Claim
81 words
The method defined in claim 1 wherein the wire or rod used in step (a) is made from wire or rod drawn at a temperature in the range of about 20°C to about 200°C to provide a reduction in area of about 5 percent to about 30 percent and a tensile strength of about 517MPa to about 863 MPa, and the tensile strength provided in step (b) is higher than the tensile strength of the wire or rod entering step (b).
Claim 10
Dependent Claim
19 words
The method defined in claim 1 wherein the wire or rod consists essentially of AISI 300 series stainless steel.
References Cited (Backward Citations)
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