Magnesium-based alloy screw and producing method thereof
a technology of magnesium-based alloy and screw, which is applied in the direction of screw, forging/pressing/hammering apparatus, handling devices, etc., can solve the problems of poor ductility, poor plastic workability at room temperature, and inability to forge such as screw work at room temperature, so as to increase the life of working tools, excellent productivity, and excellent strength
Inactive Publication Date: 2012-11-01
SUMITOMO ELECTRIC IND LTD
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- Description
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AI Technical Summary
Benefits of technology
This approach enables the production of magnesium-based alloy screws with excellent tensile strength and productivity at lower temperatures, extending tool lifetimes and reducing production costs, while maintaining or exceeding the strength of conventionally produced screws.
Problems solved by technology
However, since Mg and its alloy have hexagonal close-packed lattice (hcp) structure, they have poor ductility and their plastic workability is extremely poor at room temperature.
For example, when general metal material is used, production of screw is carried out at room temperature, but when magnesium-based alloy is used, forging such as screw working can not be carried out at room temperature.
Method used
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Effect test
text example 1-2
[0053]Similar tests were carried out using magnesium-based alloys having different compositions. That is, after extruded materials were subjected to drawing, drawn materials subjected to thermal treatment were subjected to head working at various temperatures using the same forging apparatus (screw blank for M2 and screw blank for M6 were produced). Compositions of magnesium-based alloys used for the test will be shown below.
[0054]A magnesium-based alloy containing Al: 1.2% by mass, Zn: 0.4% by mass, Mn: 0.3% by mass, and balance comprising Mg and impurities (material corresponding to ASTM AZ10)
[0055]A magnesium-based alloy containing Al: 6.4% by mass, Zn: 1.0% by mass, Mn: 0.28% by mass, and balance comprising Mg and impurities (material corresponding to ASTM AZ61)
[0056]A magnesium-based alloy containing Al: 9.0% by mass, Zn: 0.7% by mass, Mn: 0.1% by mass, and balance comprising Mg and impurities (material corresponding to ASTM AZ91)
[0057]A magnesium-based alloy containing Al: 1.9...
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Abstract
An alloy screw producing method includes a head forging step in which a head working for forming a head portion of a screw on a wire made of magnesium-based alloy obtained by drawing is carried out by warm working to produce a screw blank, and a thread rolling step in which thread rolling for forming screw thread on the screw blank is carried out by warm working to produce a screw. The head working in the head forging step is carried out using holding die which fixes the wire and a punch which forms a head portion of the screw. The holding die and the punch are heated, in which at least the holding die are heated to 140° C. or higher and 250° C. or lower.
Description
TECHNICAL FIELD[0001]The present invention relates to a screw made of magnesium-based alloy and a producing method thereof.BACKGROUND ART[0002]The magnesium-based alloy is lighter than aluminum in weight, and has more excellent specific strength and specific rigidity as compared with steel or aluminum and thus, the magnesium-based alloy is widely used for aircraft parts, automobile parts, bodies of various electrical products and the like.[0003]However, since Mg and its alloy have hexagonal close-packed lattice (hcp) structure, they have poor ductility and their plastic workability is extremely poor at room temperature. For example, when general metal material is used, production of screw is carried out at room temperature, but when magnesium-based alloy is used, forging such as screw working can not be carried out at room temperature.[0004]The workability of the magnesium-based alloy is largely varied depending upon the temperature. Severe plastic working such as screw working can ...
Claims
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IPC IPC(8): B21H3/02B21H3/06B21J1/06B21J5/00B21K1/46B21K27/06C22C23/02C22F1/00C22F1/06F16B33/00F16B35/00
CPCB21H3/06B21J1/06B21K1/46C22C23/02F16B35/00C22C23/06C22F1/06F16B33/00C22C23/04B21J5/00B21K1/56
Inventor OISHI, YUKIHIROKAWABE, NOZOMUHASHIMOTO, KENZABUROFUKUDA, KENJI
Owner SUMITOMO ELECTRIC IND LTD