CA2620735A1 - Method for cold forging high strength fastener with austenitic 300 series material - Google Patents
Method for cold forging high strength fastener with austenitic 300 series material Download PDFInfo
- Publication number
- CA2620735A1 CA2620735A1 CA 2620735 CA2620735A CA2620735A1 CA 2620735 A1 CA2620735 A1 CA 2620735A1 CA 2620735 CA2620735 CA 2620735 CA 2620735 A CA2620735 A CA 2620735A CA 2620735 A1 CA2620735 A1 CA 2620735A1
- Authority
- CA
- Canada
- Prior art keywords
- austenitic
- fastener
- cold forging
- high strength
- shank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract 11
- 238000010273 cold forging Methods 0.000 title claims abstract 6
- 239000000463 material Substances 0.000 title claims abstract 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract 6
- 238000005260 corrosion Methods 0.000 claims abstract 3
- 230000007797 corrosion Effects 0.000 claims abstract 3
- 238000005553 drilling Methods 0.000 claims abstract 3
- 239000003086 colorant Substances 0.000 claims 1
- 238000005242 forging Methods 0.000 claims 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 230000002087 whitening effect Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Forging (AREA)
Abstract
The present invention pertains to a method for cold forging high strength fastener with austenitic 300 series material comprising the procedures of initially preparing a raw austenitic shaft and then proceeding through a cold forging method to reduce its diameter for thereafter generating a preliminary shank, which can undertake above 1/2 force more than the raw shaft; further passing through the following formations of the head, the drilling portion and threads in sequence to build an integral fastener. Thus, the entire cold forging facilitates to fabricate the fastener with high strength and hardness by lower manufacturing cost and with effective corrosion resistance, so as to firmly drill the fastener into objects and increase the screwing security.
Claims (3)
1. A method for cold forging high strength fastener with austenitic 300 series material comprising the steps of:
a preparation for preparing a raw austenitic 300 series shaft having a first diameter, which is initially squeezed by cold forging for reducing above 15% of said first diameter and hence generating a preliminary shank with a second diameter smaller than said first diameter, thus said shank undertaking above 1/2 force greater than said raw shaft;
a head formation for forming a screw head at one end of said shank;
a drill point formation for forging a drilling portion at the other end of said shank, opposite to said screw head; and a thread formation for continuously rolling a plurality of screw threads between said head and said drilling portion, hence an integral fastener is accomplished.
a preparation for preparing a raw austenitic 300 series shaft having a first diameter, which is initially squeezed by cold forging for reducing above 15% of said first diameter and hence generating a preliminary shank with a second diameter smaller than said first diameter, thus said shank undertaking above 1/2 force greater than said raw shaft;
a head formation for forming a screw head at one end of said shank;
a drill point formation for forging a drilling portion at the other end of said shank, opposite to said screw head; and a thread formation for continuously rolling a plurality of screw threads between said head and said drilling portion, hence an integral fastener is accomplished.
2. The method as claimed in claimed 1, wherein, a procedure of whitening is subsequently proceeding after said procedure of thread formation for retrieving primary colors of raw austenitic 300 series materials.
3. The method as claimed in claimed 1, wherein, a procedure of corrosion resistance is subsequently proceeding after said procedure of thread formation in order to coat with a rust-resistant layer on an outer surface of said integral fastener for corrosion protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2620735A CA2620735C (en) | 2008-02-08 | 2008-02-08 | Method for cold forging high strength fastener with austenitic 300 series material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2620735A CA2620735C (en) | 2008-02-08 | 2008-02-08 | Method for cold forging high strength fastener with austenitic 300 series material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2620735A1 true CA2620735A1 (en) | 2009-08-08 |
| CA2620735C CA2620735C (en) | 2012-03-06 |
Family
ID=40940190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2620735A Active CA2620735C (en) | 2008-02-08 | 2008-02-08 | Method for cold forging high strength fastener with austenitic 300 series material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2620735C (en) |
-
2008
- 2008-02-08 CA CA2620735A patent/CA2620735C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CA2620735C (en) | 2012-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |