JP2945112B2 - Vibration absorbing spring alloy, spring member using the same, and electronic device using the spring member - Google Patents

Description

The present invention relates to a vibration absorbing spring alloy, a spring member using the same, and an electronic device using the spring member.

2. Description of the Related Art Conventionally, in a double-sided magnetic head of an electronic device, for example, a floppy disk drive, a carriage 10 is equipped with an S0 head 12 as shown in FIG.
It is configured to move linearly in the radial direction of.
One end of the head arm 13 is attached to the carriage 10, and the other end supports the S1 head 14. In this case, each of the heads 12, 14 is connected to the carriage 10 or the head arm 1 via a leaf spring member called a gimbal 11, respectively.
It is supported by. The heads 12 and 14 come into contact with each other in such a manner as to sandwich the recording medium 15 from above and below, and perform read / write operations.

As shown in FIG. 2, the gimbal 11 is made of a plate having a slit 21 formed therein, and has a central portion 22 on which a slider, which is the main body of the magnetic head, is placed. This gimbal
Numeral 11 is adapted to rotate freely with each of the X axis and the Y axis shown in FIG. 2 as a rotation axis. When the magnetic head comes into contact with the recording medium, the magnetic head moves. It is a member used so that it can follow.

FIG. 3 is a perspective view showing a configuration of a magnetic head support mechanism in the hard disk drive. The magnetic head support mechanism includes a bracket 30, a load spring 31, and a gimbal 32 for mounting on a carriage (not shown).
The gimbal 32 supports the magnetic head 33.

The material for these gimbals 11 and 32 is SUS30
Four series alloys are used.

However, since the conventional gimbal or load spring has a single leaf spring structure, a force generated when the magnetic head comes into contact with the recording medium acts on the magnetic head, which may cause large vibration. If the vibration is large, the contact state between each head supported by the gimbal of the magnetic head and the recording medium is deteriorated, and there has been a problem that the reading / writing operation by the magnetic head becomes unstable.

In order to solve such a problem, there is a method of attaching an elastic body (damper material) such as a rubber member to each member for absorbing vibration such as a gimbal or a load spring. However, in this method, an operation of attaching the damper material to each member occurs, and there has been a problem that the manufacturing process is complicated.

It is also considered to use various vibration absorbing alloys for vibration absorption, such as 13Cr-3Al-Fe alloy, which have been conventionally developed in order to omit the work of attaching the elastic body. In such applications where repetitive vibrations are applied and spring characteristics are required, the conventional vibration-absorbing alloys described above do not have sufficient spring characteristics at present.

(Problems to be Solved by the Invention) As described above, in a spring member such as a gimbal used for a magnetic head, a method of attaching an elastic body to a gimbal for absorbing vibration causes a problem that a manufacturing process becomes complicated, and However, the conventional vibration-absorbing alloy has a problem of insufficient spring characteristics, and a material having both the spring characteristics and the vibration absorbing effect has not been found.

Accordingly, an object of the present invention is to provide a vibration absorbing spring alloy having both a spring characteristic and a vibration absorbing effect.

[Structure of the Invention] (Means and Actions for Solving the Problems) The vibration-absorbing spring alloy of the present invention has a weight percentage of Cr of 5 to 30% and Ni of 0.1 to 1
0%, with the balance being substantially Fe, and in terms of the properties of the alloy, one or more of Vickers hardness of Hv 200 or more, tensile strength of 60 kg / mm ² or more, and fatigue strength of 20 kg / mm ² or more It is an alloy that satisfies two or more kinds of properties, and is an alloy consisting of 5 to 30% of Cr, 0.1 to 10% of Ni, 10% or less of Al with the balance being substantially Fe in terms of weight%, and hardness in the properties of the alloy. Has Vickers hardness of Hv200 or more and tensile strength of 60 kg / mm
^It is characterized by satisfying one or more kinds of characteristics of ² or more and fatigue strength of 20 kg / mm ² or more. Further, at least one or more selected from Ti, Zr, V, Nb, Ta, Mo, W, Mn, Co, Cu, C, N, Si, Sn, Sb, Pb and a rare earth element is 20% by weight in total. The following may be added.

The above-described vibration-absorbing spring alloy of the present invention has high hardness and mechanical strength, and has sufficient characteristics even in applications where repeated stress is applied. That is, the alloy has both mechanical strength and vibration absorption as a spring alloy.

 First, the alloy composition of the present invention will be described below.

Cr is an element that improves the vibration absorption effect, corrosion resistance and mechanical strength.If the amount is too small, the effect of addition is small, and if the amount is too large, the workability is reduced. 30% by weight. Preferably it is 8 to 20% by weight, more preferably 10 to 15% by weight.

Ni is an element that improves hardness, corrosion resistance and mechanical strength.If the amount is too small, the effect of addition is small,
Conversely, if the amount is too large, the effect of absorbing vibration is reduced, so the amount was set to 0.1 to 10% by weight. Preferably 0.5 to 8
%, More preferably 1 to 5% by weight.

Further, by adding Al to the Fe-Cr-Ni alloy, it is possible to further improve the vibration absorbing effect while maintaining the hardness, which is more preferable. However, if the amount of Al is too large, the workability is reduced. Therefore, the preferable amount is 10% by weight or less. A more preferred amount is 0.
5 to 5% by weight.

Further, in order to improve the hardness of the Fe-Cr-Ni alloy or Fe-Cr-Ni-Al alloy, Ti, Zr, V, Nb, Ta, Mo, W, Mn, C
It is also possible to add at least one selected from the group consisting of o, Cu, C, N, Si, Sn, Sb, Pb and rare earth elements in a total amount of 20% by weight or less. However, if the amounts of these elements are too large, the vibration absorbing effect is reduced and the workability is also reduced. Therefore, the amount is set to 20% by weight or less.

The present invention provides an alloy having the above composition, and further has at least one of Vickers hardness of Hv 200 or more, tensile strength of 60 kg / mm ² or more, and fatigue strength of 20 kg / mm ² or more in properties. The characteristics of are satisfied.

In the present invention, if the hardness is too low, deformation is likely to occur when processing parts such as gimbals and road springs, and the process becomes complicated. Therefore, the hardness is set at Vickers hardness of Hv 200 or more. Preferably it is Hv350 or more.

Also, if the tensile strength is too low, it is brittle, and cracks are likely to occur during processing or use.
60 kg / mm ² or more. It is preferably at least 70 kg / mm ² , more preferably at least 80 kg / mm ² .

Further, if the fatigue strength is too low, the properties against repetitive stress when used as a spring alloy are insufficient, and it is not possible to have excellent properties as a spring alloy. Therefore, the fatigue strength was set to 20 kg / mm ² or more. It is preferably at least 25 kg / mm ² .

In the present invention, it can be easily understood that an alloy that satisfies all of the above characteristics is most preferable.

From the composition of the present invention described above, an alloy having the mechanical strength defined by the present invention and having both vibration damping properties can be obtained by the following production method.

That is, an alloy in the composition range of the present invention is melted and cast by a conventional method to obtain an ingot. The ingot is rolled by a conventional method to obtain a predetermined plate. First, the obtained plate material is heated and held at 400 to 1200 ° C. for 1 second to 100 hours.
The preferable heating and holding time at this time is 1 per 1 mm of the heat-treated material.
min or more. The cooling rate after heating and holding is 300 ° C
By lowering the cooling rate to not more than / min, that is, it is possible to obtain a spring alloy having the characteristics of the present invention. If the cooling rate is too fast, sufficient vibration absorption characteristics cannot be obtained, and mechanical strength cannot be easily obtained. The preferred cooling rate is 200 ° C./min or less.

The vibration damping spring alloy of the present invention is used for various spring members used for small storage devices such as a floppy disk device or a hard disk device. Among them, particularly, the fatigue strength is further improved because the recording medium rotates at a higher speed. It exerts an excellent effect when used in a hard disk device that requires a. In addition, the present invention is not limited to these applications, and can be applied to applications that require spring characteristics and vibration absorption, for example, a spring component used in a pickup section of a compact disc.

Example An alloy having an alloy composition shown in Table 1 was melted and cast by a conventional method to obtain an ingot having a diameter of 100 mm and a length of 300 mm. The obtained ingot was cast and cold-rolled by a conventional method to obtain a sheet material having a sheet thickness of 1 mm. The obtained sheet material was subjected to the heat treatment shown in Table 1 to obtain a sample of the present invention. For comparison, a 13Cr-3Al-Fe alloy as a conventional vibration absorbing alloy and an SUS304 alloy conventionally used as a gimbal were used as comparative samples.

The Vickers hardness (Hv) of the obtained sample is specified by JIS Z 2244, the tensile strength is specified by JIS Z 2241, and the fatigue strength is specified by JIS Z 2275. 10 ⁷ times or more repetitive vibrations with shown in table 1 was measured as a stress when wanted, such broken when added in swing, in order to measure the vibration absorbing effect, in Figure 2 the thickness 50μm Make the gimbal shown
The vibration decay time of the S0 head 12 when the carriage 10 was vibrated when incorporated in the floppy disk device shown in the figure was measured. The results are shown in Table 1 together with the vibration damping time of SUS304 being 100.

As described above, the present invention has a higher hardness than conventional spring alloys, does not cause sagging or deformation, can provide stable spring characteristics, and has an excellent vibration absorbing effect. doing.

Therefore, when the alloy of the present invention is used in, for example, a mechanism for supporting a magnetic head, it becomes possible to absorb the vibration generated when the magnetic head comes into contact with the recording medium. Therefore, the state of contact between the magnetic head and the recording medium does not decrease, and a stable read / write operation can always be repeated.

Furthermore, since the spring characteristics and the vibration absorbing effect are obtained with a single alloy, a complicated manufacturing process of attaching a dynamic damper for vibration absorption to each member is unnecessary, and the efficiency of the assembly process of various devices is improved. This is extremely useful industrially.

[Effects of the Invention] As described above, the present invention has excellent mechanical strength, can always obtain stable spring characteristics, and has an excellent vibration absorbing effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing the structure of a carriage mechanism of a double-sided magnetic head in a floppy disk drive, FIG. 2 is a plan view showing the structure of a gimbal, and FIG. FIG. 3 is a perspective view illustrating a configuration of a head support mechanism. 10 ... Carriage, 11,32 ... Gimbal 12 ... SO head, 13 ... Head arm 14 ... S1 head, 15 ... Recording medium 30 ... Hardware, 31 ... Load spring 33 ... Magnetic head

Claims (8)

(57) [Claims] 1. An alloy comprising 5 to 30% of Cr, 0.1 to 10% of Ni and the balance being substantially Fe in terms of% by weight. The alloy has a hardness of Hv 200 or more in Vickers hardness and a tensile strength of 60 kg / mm ^Two
Any one or more of fatigue strength of 20kg / mm ² or more
A vibration-absorbing spring alloy characterized by satisfying more than one kind of characteristics. (2) Cr 5-30%, Ni 0.1-10%, Ti, Zr, V,
At least one selected from the group consisting of Nb, Ta, Mo, W, Mn, Co, Cu, C, N, Si, Sn, Sb, Pb and rare earth elements, in a total amount of 20% or less;
The balance is an alloy substantially composed of Fe, and the hardness of the alloy is Hv200 or more in Vickers hardness, and the tensile strength is 60 k.
A vibration-absorbing spring alloy characterized by satisfying at least one property of g / mm ² or more and fatigue strength of 20 kg / mm ² or more. 3. An alloy composed of 5 to 30% of Cr, 0.1 to 10% of Ni, 10% or less of Al and substantially the balance of Fe in terms of% by weight, and the hardness of the alloy is Hv 200 or more in terms of Vickers hardness and tensile strength. There 60 kg / mm ² or more, any fatigue strength 20 kg / mm ² or more 1
A vibration absorbing spring alloy characterized by satisfying at least one kind or two or more kinds of properties. 4. Cr 5-30%, Ni 0.1-10%, Al 10% or less, Ti, Zr, V, Nb, Ta, Mo, W, Mn, Co, Cu, C, N, Si, by weight% At least one selected from Sn, Sb, Pb and rare earth elements in total
20% or less, with the balance substantially consisting of Fe alloy, and hardness Hv200 or more in Vickers hardness in the characteristics of the alloy, the tensile strength of 60 kg / mm ² or more, fatigue strength 20 kg / mm ² or more of any one Or a vibration absorbing spring alloy characterized by satisfying two or more kinds of characteristics. 5. A spring member using the vibration absorbing spring alloy according to any one of claims 1 to 4. 6. An electronic device using the spring member according to claim 5. 7. The electronic device according to claim 6, wherein the electronic device is a floppy disk device. 8. The electronic device according to claim 6, wherein the electronic device is a hard disk device.