JPS5830384B2 - Free-cutting high permeability alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses Ni+ Cr+ Ca and Fe as main components, and further contains Mo p W t V , N as subcomponents.
b #TajMnp Ges Tly Al+ St
This invention relates to a free-cutting, high-permeability alloy comprising one or more of the following elements: y Cot Cutpb and P, and a small amount of impurities.

The present inventors previously disclosed in Japanese Unexamined Patent Publication No. 49-117319 a material consisting of Ni, Fe, and Cr containing 35 to 55 Ni, or with this as the main component and further as a subcomponent, Moy We Vt Nb t Ta * Mny
Gem Tis Al* An alloy consisting of one or more of Si, Co, and Cu and a small amount of impurities is an excellent magnetic alloy that is easy to form and has high permeability. Disclosed.

This alloy is used not only as a magnetic material for magnetic heads, but also as a magnetic material for magnetic heads.
It is also used as a magnetic material for general electromagnetic equipment,
Since it contains a large amount of Ni, it has the disadvantage of being sticky and difficult to cut.

As a result of numerous studies to improve the machinability of such an alloy, the present inventors have found that the main components are 35-55% Ni, 5-16% Cr, and the balance Fe, and further sub-components include Mo4% or less, W6% or less, and v4. % or less, Nb 2% or less, Ta 6%
Below, Mn 6% or less, 1Ge 4% or less, Ti 4%
Hereinafter, an alloy consisting of a total of 0.01 to 6% of any one or two or more of A14% or less, Si 4% or less, Co 6% or less, and Cu6φ or less, and a small amount of impurity, CaO, 01 ~0.3% or CaO,0-1~
It has been found that by adding 0.3% and PbO3% or less and/or PO03φ or less, machinability can be significantly improved without impairing moldability and magnetic properties.

That is, the present invention provides a free-cutting high magnetic permeability alloy that has an initial magnetic permeability of 500 or more and a maximum magnetic permeability of 3000 or more, and is easy to forge and form. It is suitable as a magnetic material for electromagnetic equipment.

In addition, a more preferable alloy of the present invention is Ni37-50%
, Cr8~15φ and the balance Fe are the main components, and the subcomponents are M0 3% or less, W 5% or less, ■ 3% or less, Nb 2% or less, Ta 5 or less, Mn 5% or less, G
An alloy consisting of a total of 0.01 to 6 of any one or more of E3% or less, Ti3% or less, A73% or less, Si3% or less, Co5% or less, and Cu5% or less, and a small amount of impurities. Ca O, 01-0.3% or Ca
It consists of adding 0.01 to 0.3%, Pb 0.3% or less, and/or PO3 multigroup or less.

To make the alloy of the present invention, first Ni35~55φ, Cr
5-16%, Ca1l ~0.3% and balance Fe,
Furthermore, Mo 4φ or less, W6φ or less, ■4% or less, Nb
2% or less, Ta 6% or less, Mn 6 or less, Ge 4% or less, Ti 4% or less, A14% or less, Si 4% or less, C0
6% or less, Cu 6% or less, pbo.

Melt an appropriate amount of one or more types of 3 or less and PO03φ or less in total of o, oi to 6 in a suitable melting furnace in air, preferably in a non-oxidizing atmosphere or in vacuum. After that, add a small amount (1 or less) of mankan, silicon, aluminum, titanium, calcium alloy, magnesium alloy, and other deoxidizing agents and desulfurizing agents to remove as much impurity as possible and obtain a compositionally uniform molten alloy. .

Next, this is poured into a mold of an appropriate shape and size to obtain a sound ingot, which is then subjected to forming processes such as forging, rolling, and swaging at room temperature or high temperature to obtain the desired shape, such as thickness. Obtain a thin plate with a diameter of 0.3 mm or a round bar with a diameter of 15 mm.

When measuring magnetic properties, an annular plate with an outer diameter of 45 plates and an inner diameter of 33 mm is punched out from the above-mentioned thin plate, and the plate is heated at a temperature higher than the recrystallization temperature, that is, 600°C, in hydrogen or other suitable non-oxidizing atmosphere, or in vacuum. After heating at a temperature below the melting point above, it is cooled.

The magnetic properties and machinability of various alloys produced by the method described above are shown in Table 1 below.

The magnetic properties in Table 1 show the properties when the alloy was heated at 1100° C. for 2 hours in a hydrogen atmosphere and then cooled in a furnace.

In addition, the cutting test in Table 1 was conducted using a round bar with a diameter of 15mm in hydrogen at 70°C.
After heating at 0°C for 1 hour, cut depth 0.5 mm, feed rate 0.10xg/rev, using Tungaloy S-2 cutting tool.
The results are shown when cutting was performed at a cutting speed of 100 m/min.

The alloys in Table 1 are high-purity metals Cr, vatWp
Mn, V, Nb, Ti + AAt Si +
Ca, P, etc. were used, but even if economically advantageous commercially available ferroalloys and calcium alloys are used instead, metal elements can be used as long as sufficient deoxidation and desulfurization are performed during melting. Almost the same high permeability and machinability as in the conventional case are obtained.

As mentioned above, the alloy of the present invention has excellent machinability, so it is suitable as a magnetic material for electromagnetic equipment that requires cutting, and its excellent magnetic properties make it suitable for use as a magnetic material for general electromagnetic equipment. It is also very suitable as a material.

Furthermore, since the alloy of the present invention containing a large amount of Cr has excellent corrosion resistance, it is suitable as a magnetic material for electromagnetic equipment that requires corrosion resistance.

Next, in the present invention, the composition of the alloy is 35 to 55% Ni, C
The reason why r is limited to 5 to 16% is that magnetic permeability deteriorates outside the composition range, and the reason why it is limited to Ca0.01 to 0.3 is that if it is less than 0.01%, machinability is poor, and if it is more than 0.3%. This is because the magnetic permeability deteriorates.

Furthermore, Ge and Ti 4% or less, Mn,
The reason why Co and Cu are limited to 6% or less is that forging and workability are good within that composition range, whereas machinability and magnetic permeability deteriorate above this range.Nb2% or less, MO and V
The reason why the composition is limited to 4% or less and a content of W and Ta6 is that if the composition exceeds this range, the magnetic permeability deteriorates and a predetermined value cannot be obtained.

In addition, Pb and Po were limited to 3% or less at 0.3
This is because the magnetic permeability deteriorates significantly above this value.

As is clear from Table 1, the alloy of the present invention has fairly high magnetic permeability within its composition range, excellent machinability, and good workability; however, outside this composition range,
The magnetic permeability and machinability deteriorate, and machining becomes difficult, making it unsuitable as a free-machining high permeability alloy.

Claims (1)

[Claims] 1 Main components in weight ratio: 35 to 55% Ni, Cr5
~16%, CaO, 01~0.3% and balance Fe, and as subcomponents Mo4% or less, W6% or less, ■4%
Below, Nb 2% or less, Ta 6% or less, Mn6φ or less, Ge 4% or less, Ti 4I% or less, Al 4 or less,
Si 4% or less, Co 6% or less, Cu 6% or less, Pb
Any one or two of 0.3 or less and PO13φ or less
A free-cutting high magnetic permeability alloy characterized by having an initial magnetic permeability of 500 or more and a maximum magnetic permeability of 3000 or more, consisting of a total of 0.01 to 6% of carbon atoms and a small amount of impurities.