JPH0768597B2 - Non-magnetic spring material and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a spring material that is non-magnetic and has excellent spring properties, and a method for manufacturing the spring material.

[Technical background of the invention and its problems]

In the presence of a magnetic field, including magnetic recording related equipment, a high-strength spring that is non-magnetic and has excellent nematicity is often required. For example, in the manufacture of a magnetic head, the core (1), the winding coil (3), the terminal (5), the resin portion (6), the core holder (7) in the casing process of the magnetic head as shown in FIG. The magnetic head pressing spring (2) is used to fix the magnetic head composed of the above) to the shield case (4) and to maintain the dimensional accuracy.

Phosphor bronze and beryllium copper have been used for this magnetic head presser spring, but recently, as the performance of magnetic heads has advanced, manufacturing technology has become more difficult. A material having a high spring property has been required for the purpose of improving accuracy. From this point of view, beryllium copper can be said to be a good material, but there is a demand for improvement in that beryllium vapor, beryllium oxide, etc., which are harmful to the human body, are produced in the production process, and the production process is complicated.

Ni-Si-Cu based alloys and Ti-Cu based alloys have been recently developed as alloys having a high spring property equivalent to beryllium copper, but these alloys were not sufficient.

[Purpose of the present invention]

The present invention has been made in view of the above, and an object thereof is to provide a non-magnetic spring material having a spring property equal to or higher than that of beryllium copper, and a manufacturing method thereof.

[Outline of Invention]

The present inventors have a weight percentage of manganese of 5% or more and 35% or more.
Less than, nickel 5% to less than 35%, first element group and second
A method that contains 0.001 to 20% of any one element contained in the element group in a total amount of one or two or more, and the rest is cold treated after solution treatment, and further subjected to aging treatment It was found for the first time that the high spring property equivalent to beryllium copper can be obtained by applying.

First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, zinc, tin, zirconium, niobium, molybdenum, hafnium,
Tantalum, tungsten The total content of the elements of the first element group is in the range of 0.01 to 15%.

Second element group Carbon, nitrogen, magnesium, phosphorus, sulfur, calcium, gallium, selenium, yttrium,
Rare earth element, silver, indium, tellurium, lead Note that the total content of the elements of the second element group is 0.001 to 5%.

That is, the spring property has been conventionally judged only by the spring limit value (or tensile strength). However, the present inventors have for the first time found that the spring property has not only the spring limit value but also a permanent strain against a stress equal to or higher than the spring limit value. It has been found that the high spring property can be obtained only when the characteristics of both of them (the spring limit value and the permanent set against the displacement above the spring limit value) are satisfied. For example, Cu
-When examining the Ni-Sn alloy and Cu-Ti alloy,
The spring limit is certainly as high as beryllium copper. However, the permanent strain biased to the displacement above the spring limit is much larger than that of beryllium copper. Therefore, the elasticity is not necessarily good. As shown in this example as well, the spring limit value and the permanent strain for a displacement equal to or more than the spring limit value are not related to each other and are independent of each other. Therefore, unless both properties are intentionally obtained, it does not mean that a high spring property is obtained. Beryllium-copper is a material that satisfies both of these characteristics, but it was difficult to develop a comparable material.

Therefore, the inventors of the present application conducted various research and experiments to obtain a spring material having a high spring limit value and a small permanent set with respect to a displacement of the spring limit value or more. As a result, when the method of the present invention was applied to the alloy of the present invention, For the first time, a spring material having good properties of both, that is, a spring material having a spring limit value of 100 kg / mm ² or more and having a small permanent set against a displacement exceeding the spring limit value was obtained.

Here, a non-magnetic spring material according to the present invention and a method for manufacturing the same will be described. First, the reasons for limiting the composition of the non-magnetic spring material will be described. Manganese is an element necessary to secure the spring strength. When the amount is 5% or more, it is easy to obtain the spring strength equal to or higher than that of conventional beryllium copper, and 35% or less is sufficient. This range was set because it is easy to obtain elongation and is difficult to break when a displacement exceeding the spring limit value is applied to the spring, and the permanent set is small. It is preferably 8 to 20%, more preferably 10 to 15%. By limiting the range in this way, the permanent set with respect to the stress equal to or higher than the spring limit value becomes remarkably small, and a spring material equal to or more than beryllium-copper can be obtained more easily. Nickel forms a compound with manganese and precipitates in the alloy substrate. It is an element necessary for improving the spring strength, and if the amount is 5% or more, sufficient spring strength is easily obtained, and 35% or less. In that case, sufficient elongation is likely to be obtained, and it is difficult for the spring to break when a stress exceeding the spring limit value is applied to the spring, and the permanent set is small, so this range was made.
It is preferably 8 to 20%, more preferably 10 to 15%. By limiting the range in this way, the permanent set for displacement above the spring limit value becomes smaller, as in manganese,
Beryllium-copper equivalent or better spring material can be obtained more easily.

The elements of the first element group and the second element group are important elements in the present invention. If these elements are too small, precipitation sufficient to secure spring strength will not occur, and although elongation is large, the spring limit value is low and desired properties cannot be obtained. In addition, although a desired spring strength can be sufficiently obtained by containing a large amount of these elements, elongation becomes small, and when a displacement exceeding the spring limit value is applied, breakage easily occurs and permanent set increases. Therefore, in consideration of these things, the total content of the elements of the first element group is 0.01 to 15%, preferably 0.02 to 13%, more preferably 0.05 to 10%, and the total content of the elements of the second element group. Quantity is
0.001 to 5%, preferably 0.005 to 4%, more preferably 0.
01-3% is good. The total content of the elements contained in the first element group and the second element group is preferably 0.001 to 20%.

Next, the manufacturing method will be described. First, solution treatment is performed to homogenize the alloy components and to impart a uniform spring strength in the subsequent aging treatment. It is necessary that the temperature is 700 ° C or higher, preferably 800 ° C or higher. However, even if the temperature is raised, the effect becomes small, and the temperature is set to 1000 ° C. or less from the viewpoint of causing coarsening of crystal grains, but it is preferably 850 to 950 ° C.

Next is cold working. This cold working is important for manufacturing the spring material according to the present invention, for example, a magnetic head holding spring, and if cold working is not performed, the material is too soft when forming into a spring shape. Because it is a so-called waistless state,
The cold working rate must be at least 10% because it is difficult to handle when forming it into a spring shape, it is not industrial due to long aging treatment time, and sufficient spring strength cannot be obtained. However, 30% or more is desirable, but excessive cold working raises the hardness of the material and makes it easier to damage the press die during spring forming, and cracks tend to occur in the bent part, so it is practically 80%. Below, preferably
70% or less is good.

Next is an aging treatment. This aging treatment is an important heat treatment for giving the spring strength of the spring material according to the present invention, and it is necessary to treat a temperature of 350 ° C. or more, but it exceeds 500 ° C. This range is set because aging treatment at temperature results in overaging, but industrially preferably 380 ° C to 480 ° C, more preferably 430 ° C to 470 ° C.

By the way, the spring material of the present invention may be any component as long as elasticity is required, for example, a magnetic head pressing spring,
Connectors and spectacle parts are particularly preferred.

〔The invention's effect〕

The alloy having the components shown in Table 1 was subjected to the manufacturing method shown in Table 1 to prepare a plate having a plate thickness of 0.25 mm, a width of 10.0 mm and a plate length of 100 mm. Both ends of this plate are supported with a space of 12 mm, and a load is applied from above until the displacement of the central part becomes 3 mm. After maintaining for 5 seconds in this state, when a load was applied, the permanent strain generated in the central portion at that time was measured. The results are shown in Table 1.

As can be seen from these results, the alloy of the present invention has a high spring limit value and a small permanent set with respect to a certain displacement on the spring limit value, and thus it can be said that the alloy of the present invention has extremely excellent spring property (high spring property). Further, when the spring property of the present invention was actually mounted as a magnetic head pressing spring and the life, easiness of handling and reliability were measured, it could be confirmed that it was equivalent to or better than the beryllium-copper alloy.

The spring material of the present invention manufactured by the above manufacturing method has an extremely excellent spring property, and thus is suitable as a spring material for electronic parts, magnetic parts and the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a magnetic head.
Is a core, (2) is a magnetic head pressing spring, (3) is a winding coil, (4) is a shield case, (5) is a terminal, (6).
Is a resin, and (7) is a core holder.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Noriaki Yagi Inventor Noriaki Yagi 8 Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock company Toshiba Yokohama metal factory (56) Reference JP-A-50-17318 (JP, A) JP 52-136828 (JP, A) JP-A-56-51545 (JP, A)

Claims (6)

[Claims] 1. A weight percentage of manganese 5% or more and less than 35%, nickel 5% or more and less than 35%, and one or more of any one of the elements included in the following first element group and second element group in total. A non-magnetic spring material containing 0.001 to 20%, the balance being substantially copper, having a spring limit value of 100 kg / mm ² or more and having a small permanent set against a displacement exceeding the spring limit value. (Note) First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, zinc, soot, zirconium, niobium, molybdenum, hafnium,
Tantalum, tungsten The total content of the elements of the first element group is in the range of 0.01 to 15%. Second element group Carbon, nitrogen, magnesium, phosphorus, sulfur, calcium, gallium, selenium, yttrium,
Rare earth element, silver, indium, tellurium, lead Note that the total content of the elements of the second element group is 0.001 to 5%. 2. The non-magnetic spring material according to claim 1, wherein the spring material is for a magnetic head. 3. A weight percentage of manganese 5% or more and less than 35%, nickel 5% or more and less than 35%, and one or more of any one of the elements included in the following first element group and second element group in total. An alloy containing 0.001 to 20%, the balance being substantially copper, subjected to solution treatment, cold working, and then aging treatment. Spring limit value is 100 kg / mm ² or more and spring limit value. A method for manufacturing a non-magnetic spring material having a high spring property, which is characterized by having a small permanent set with respect to the above displacement. (Note) First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, zinc, tin, zirconium, niobium, molybdenum, hafnium,
Tantalum, tungsten The total content of the elements of the first element group is in the range of 0.01 to 15%. Second element group Carbon, nitrogen, magnesium, phosphorus, sulfur, calcium, gallium, selenium, yttrium,
Rare earth element, silver, indium, tellurium, lead Note that the total content of the elements of the second element group is 0.001 to 5%. 4. The method for producing a non-magnetic spring material according to claim 3, wherein the solution treatment is performed at 700 ° C. to 1000 ° C. 5. The method for manufacturing a non-magnetic spring material according to claim 3, wherein the cold working is performed at a working rate of 10% or more. 6. The method for producing a non-magnetic spring material according to claim 3, wherein the aging treatment is performed at 350 ° C. to 500 ° C.