JPS62202038A - Nonmagnetic spring material and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [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 same.

(Technical background of the invention and its problems) High-strength springs that are non-magnetic and have excellent spring properties are often required in the presence of magnetic fields, including in magnetic recording-related equipment.For example, in the manufacture of magnetic heads, In the magnetic head casing process, as shown in Figure 1, a core (1), a winding coil (3), a terminal (5), a resin part (6), and a core holder (7) are assembled.
), etc., to the shield case (4), and a magnetic head presser spring (2) is used to maintain dimensional accuracy.

Up until now, phosphor bronze and beryllium copper have been used for this magnetic head retainer spring, but as the performance of magnetic heads has improved recently, manufacturing technology has become even more difficult. For the purpose of improving dimensional accuracy, products with high springiness are required. From this point of view, beryllium copper can be said to be a good material, but its manufacturing process generates beryllium vapor and beryllium oxide that are harmful to the human body, and the manufacturing process is complicated, so improvements are desired.

Further, although Ni-St-Cu alloys and Ti-cu alloys have recently been developed as alloys having high spring properties equivalent to beryllium copper, these alloys have not been sufficient.

(Object of the present invention) The present invention has been made in view of the above, and an object of the present invention is to provide a non-magnetic spring material having spring properties equal to or superior to that of beryllium copper, and a method for manufacturing the same. I'll go.

(Summary of the Invention) The inventors of the present application have found that manganese is 5 to 35% by weight,
5-35% nickel and a total of 0.0% of one or more elements contained in the first element group and/or the second element group. High spring properties equivalent to beryllium steel can be obtained by applying a method in which an alloy containing 0.001 to 20% and the remainder is substantially copper is subjected to solution heat immersion processing and then subjected to aging treatment. I discovered this for the first time.

First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, arsenic, zinc, tin, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten The total content of elements in the first element group is 0. .01~15%
The range shall be .

Second element group carbon, nitrogen, magnesium, beryllium,
The total content of elements in the second element group such as phosphorus, sulfur, calcium, gallium, selenium, yttrium, rare earth elements, silver, indium, tellurium, and lead is 0.001 to 5%.
range.

In other words, springiness has conventionally been judged only by the spring limit value (or tensile strength), but for the first time, the inventors of the present invention have determined that spring properties include not only the spring limit value but also permanent deformation due to stress exceeding the spring limit value. It has been found that high springiness can only be achieved when both of these characteristics (the spring limit value and the permanent strain for displacements greater than the spring limit value) are satisfied.

For example, when considering Cu-Ni-5n alloys and Cu-Ti alloys, the spring limit value is certainly as high as that of beryllium copper. However, the permanent strain for displacements exceeding the spring limit is much larger than that of beryllium copper. Therefore, the springiness is not necessarily good. As shown in this example, the spring limit value and the permanent strain for a displacement greater than the spring limit value are not related to each other and are independent from each other.

Therefore, unless you intentionally obtain a material with good properties on both sides, it does not mean that you have obtained a product with high springiness. Beryllium-copper is a material that satisfies both of these characteristics, but it has been difficult to develop anything comparable to this.

Therefore, the inventors of the present application have conducted various research and experiments in order to develop a spring material that has a high spring limit value and has a small permanent deformation when the displacement exceeds the spring limit value. It was only when this method was applied that a spring material with good both properties, that is, a spring material with high springiness, was obtained.

Here, a non-magnetic spring material and a manufacturing method thereof according to the present invention will be explained. First, the reasons for limiting the composition of the non-magnetic spring material will be described. Manganese is an element necessary to ensure spring strength, and if its content is 5% or more, it is easy to obtain spring strength equal to or higher than that of conventional beryllium copper, and if it is 35% or less, it is sufficient. This range was selected because it is easy to obtain elongation, it is difficult to break when a displacement exceeding the spring limit value is applied to the spring, and the permanent deformation is small.

Preferably 8 to 20%, more preferably 10 to 15%
% is good. By limiting the range in this manner, the permanent strain caused by stress exceeding the spring limit value becomes significantly small, and it becomes easier to obtain a spring material -B having a beryllium-copper content or higher. Nickel forms a compound with manganese and precipitates in the alloy base, and is an element necessary to improve the spring strength.If the content of nickel is 5% or more, sufficient spring strength can be easily obtained.
% or less, it is easy to obtain sufficient elongation, it is difficult to break when a stress exceeding the spring limit value is applied to the spring, and permanent deformation is small, so this range was selected. Preferably 8
~20%, more preferably 10~15%. By limiting the range in this way, like manganese, the permanent strain caused by a displacement exceeding the spring limit value becomes even smaller, and it becomes easier to obtain a spring material having a beryllium-copper content or higher.

The elements of the first element group and the second element group are important elements in the present invention. If the content of these elements is too low, the spring strength cannot be ensured, and although the elongation is large, the spring limit value is low and the desired characteristics cannot be obtained. Furthermore, although the content of a large amount of these elements sufficiently increases the desired spring strength, the elongation becomes small, and when a displacement exceeding the spring limit value is applied, the spring becomes prone to breakage and permanent deformation becomes large. Therefore, taking these things into consideration, the total content of the elements of the first element group is 0.01 to 15%, preferably 0.02 to 1.
3%, more preferably 0.05-10%, the total content of elements of the second element group is 0.001-5%, preferably 0.
．． 0.005 to 4%, more preferably 0.01 to 3%.

Note that the total content of the elements included in the first element group and the second element group is preferably 0.001 to 20%.

next! ! ! I will explain how to decide. First is solution treatment, which homogenizes the alloy components and imparts uniform spring strength in the subsequent aging treatment, which requires a temperature of at least 700°C, preferably 800°C or higher. However, even if the temperature is raised, the effect becomes smaller and the crystal grains become coarser.
Although the temperature is set to 0°C or lower, it is preferably 850 to 950°C.

Next is cold working. This cold working is important for manufacturing spring materials according to the present invention, such as magnetic head presser springs. If cold working is not performed, the material will be too soft when formed into a spring shape. Because I am in a so-called weak state,
The cold working rate must be at least 10% because it is difficult to handle when forming into a spring shape, the aging treatment takes a long time and is not industrially practical, and sufficient spring strength cannot be obtained. The desired value is 30% or more, but in practice, it is 80% because excessive cold working increases the hardness of the material, making it easier to damage the press mold during spring forming, and making it easier for cracks to appear in the bent part. It is preferably 70% or less.

Next is aging treatment, which is an important heat treatment for imparting spring strength to the spring material according to the present invention, and is heated to 350°C.
Although it is necessary to treat at a temperature higher than 500°C, aging treatment at a temperature exceeding 500°C will result in overaging, so this range was set, but industrially desirable is 380°C to 480°C.
The temperature is preferably 430°C to 470°C.

By the way, the spring material of the present invention may be any part that requires elasticity, such as a magnetic head holding spring,
Particularly preferred are connectors and eyeglass parts.

[Embodiment of the invention] An alloy having the components shown in Table 1 was subjected to the manufacturing method shown in Table 1 to produce a plate having a thickness of 0.25 m, a width of 10.0 m, and a plate length of 1.
A 00al plate was created. This plate is supported at both ends with a spacing of 12 #f, and a load is applied from above until the displacement at the center reaches 31 Mt. After maintaining this state for 5 seconds, remove the load.
The permanent strain that occurred in the center at that time was measured. The results are listed 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 strain for a certain displacement above the spring limit value, so it can be said that it has extremely excellent spring properties (high spring properties). Furthermore, when the spring properties of the present invention were actually implemented as a magnetic head holding spring and its lifespan, ease of handling, and reliability were measured, it was confirmed that the spring properties were equivalent to or better than beryllium-copper alloys.

〔Effect of the invention〕

The spring material of the present invention manufactured by the above manufacturing method has extremely excellent spring properties and is therefore suitable as a spring material for electronic parts, magnetic parts, etc.

(Margin below)

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an example of a magnetic head, and in the figure (1)
is the core, (2) is the magnetic head holding spring, (3) is the winding coil, (4) is the shield case, (5) is the terminal, (6)
is a resin, and (7) is a core holder. Agent Patent Attorney Noriyuki Chika Yukio Yuyama Figure 1

Claims (1)

[Claims] 1. Manganese 5-35%, nickel 5% by weight
~35%, with a total of 0.0 of one or more elements contained in the first element group and/or second element group below.
A non-magnetic spring material having high spring properties, containing 01 to 20% of copper, and the remainder being substantially copper. (Note) First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, arsenic, zinc, tin, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten Total content of elements in the first element group The amount is 0.01-15%
The range shall be . Second element group carbon, nitrogen, magnesium, beryllium,
The total content of the second element group, including phosphorus, sulfur, calcium, gallium, selenium, yttrium, rare earth elements, silver, indium, tellurium, and lead, is in the range of 0.001 to 5%. 2. The non-magnetic spring material according to claim 1, which has a spring limit value of 100 kg/mm^2 or more and has a small permanent strain with respect to a displacement greater than the spring limit value. 3. The non-magnetic spring material according to claim 1, wherein the spring material is used for a magnetic head. 4. Manganese 5-35%, nickel 5% by weight
~35%, with a total of 0.001 of one or more elements contained in the first element group and/or second element group
Production of a non-magnetic spring material with high spring properties characterized by subjecting an alloy containing up to 20% of copper, the remainder of which is substantially copper, to cold working after solution treatment, and further subjecting to aging treatment. Method. First element group Aluminum, silicon, titanium, vanadium, chromium, iron, cobalt, germanium, arsenic, zinc, tin, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten The total content of elements in the first element group is 0. .01~15%
The range shall be . Second element group carbon, nitrogen, magnesium, beryllium,
The total content of the elements of the second element group, including phosphorus, sulfur, calcium, manganese, selenium, yttrium, rare earth elements, silver, indium, tellurium, and lead, is in the range of 0.001 to 5%. 5. The method for manufacturing a non-magnetic spring material according to claim 4, wherein the solution treatment is carried out at a temperature of 700°C to 1000°C. 6. The method for manufacturing a non-magnetic spring material according to claim 4, wherein the cold working is performed at a working rate of 10% or more. 7. The method for manufacturing a non-magnetic spring material according to claim 4, wherein the aging treatment is carried out at 350°C to 500°C.