Joints and connections – Molded joint – Fusion bond – e.g. – weld – etc.
Patent
1992-05-14
1995-07-11
Walsh, Donald P.
Joints and connections
Molded joint
Fusion bond, e.g., weld, etc.
403404, 403179, 228222, 2191171, 351 41, 428660, 428680, B25G 334, F16B 1100
Patent
active
054315069
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
TECHNICAL FIELD
This invention relates to the properties of bonded metals including forming a nickel-titanium alloy and its manufacturing method. More particularly, it relates to a new bonded metal property formed by incorporating a forming material alloy composed with shape memory, or super-elastic property, which is very difficult to bond, onto a nickel base alloy matterial promptly and correctly on the required portion. This invention also prescribes its manufacturing method. Thus, the invention can provide a wide range of the uses for this nickel-titanium alloy equipped with shape memory or super-elastic alloy material, through which good quality bonded products, for examples, eyeglasses frames, can be obtained.
BACKGROUND ART
Currently, nickel-titanium alloy, composed by the fixed proportion of nickel and titanium at the molecular ratio of 1:1 or approximate, has been confirmed to have special nature and properties. This alloy as a new compound material has been attracting public attention in every industrial field. For instance, a certain kind of nickel-titanium alloy, in which a superior memory effect can be obtained through heat treatment, has been developed for such various uses in the medical field as bone-connecting parts in orthopedics, operation clip for aneurism and so on. Also it has application in other practical fields such as automatic regulating apparatus for air conditioners, automatic window operation apparatus for green house and/or isothermal houses. The antennae of space ships and so on. Other nickel-titanium alloys are equipped with a super-elastic property chemically attained and are quite light weight. These have been used as the core materials in clothings such as wire for orthodontics and in eyeglasses frame. This alloy is expected to have wide usefullness throughout the industrial world.
In prior art, however, the shape memory of nickel and titanium alloys or super-elastic property has been of inferior quality for metallic bonding. In order to bond such nickel-titanium alloys onto small areas, especially for eyeglasses, mechanical connection by use of a rivet or a screw has been necessary, or the use of additional metal plating to allow for bonding must be performed prior to the application of the brazing method.
The rivet or screw method has the following defects: the rivetting or screwing work is troublesome and inefficient; the connecting parts are easy to turn round on the axis of the rivet or screw; and the bonding areas cannot be made smaller than the size of the rivet or screw axis.
The brazing method, on the other hand, has a defect that the durability of bonding is poor. External impact damages it because durability is dependent upon the adherence caused by the plating stratum.
There is another prior art method to bond this nickel-titanium alloy by way of the normal melt welding method. It has been found that the heat supply of melt welding affected change in the original nature of the alloy. It lost the pecularity of shape memory and super-elasticity, and at the same time the welded portions became easily oxidized and thus not durable. Accordingly, this method cannot be considered as a practical method.
All the defects mentioned above naturally restrict the scope of nickel-titanium alloy utility. With regard to eyeglasses, for example, each part is required to be made in a small size. The bonding area of each part is necessarily small, and it is quite difficult to obtain the satisfactory durability by use of prior arts as has been explained. This is the main reason that eyeglasses made of nickel-titanium alloy are not successful on the present market.
In view of these circumstances, the present inventor has developed a novel technology for bonding nickel-titanium alloy equipped with shape memory and super-elasticity onto other different forming metal materials.
SUMMARY OF THE INVENTION
The object of this invention is to present a new method of bonding of nickel-titanium alloys onto other materials of similar or dissimilar quality
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Chi Anthony R.
Furukawa Electric Co. Ltd.
Masunaga Menlo Park Co., Ltd.
Snider Ronald R.
Walsh Donald P.
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