JPH0283149A - Magnetic metal or alloy thin strip, surface polishing method thereof and polishing device - Google Patents

Abstract

PURPOSE:To reduce an iron loss by providing a scratch in the width direction of a metal alloy thin strip. CONSTITUTION:In case of polishing an alloy thin strip, the thin strip 1 wound on a thin strip reel is imparted with a constant tension by a tension controller 22, brought into contact with the peripheral face upper part of a rotating grindstone 31 in the opposite direction to the moving direction of the face to be polished of the thin strip, that is in the left direction 52, along the transfer pass 4 thereof, and the back face 1a thereof is polished. In succession it is brought into contact with the peripheral face lower part of the grindstone 32 rotated in the opposite direction to the moving direction of the face to be polished of the thin strip, i.e., the right direction 53, the surface 1b thereof is polished and it is wound on a winding reel 42. Thus, the scratch in the width direction is formed over the whole body in the length direction of the thin strip 1 and the iron loss thereof is reduced.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a magnetic metal or alloy ribbon used as a magnetic core material for transformers, choke coils, noise filters, etc. used in the high frequency range of several 10 kllz to several Mllz. The present invention relates to a surface polishing method and a surface processing device.

[Prior art] In general, iron loss at high frequencies is dominated by eddy current loss, but when plate thickness d1 and domain width 2L, 2L>d is satisfied, and the magnetic flux density B1 in the operating state is the saturation magnetic flux density. There is a relationship Sl between 33 <<B! When lS holds true, the iron loss P is given by the following equation (R, H
,Pry and C,P,Bean:JAP,29
(1958) 532. ) PL / f 紫a + (π
d B, ) 2x1.63x2LX f/6ρ ・
d...(1) where ρ: density, f: frequency 〇 Amorphous alloy ribbons etc. manufactured by liquid super-quenching method have a thin plate thickness of 50 to 10 μm, and 2L>d The conditions are fully satisfied.

As is clear from equation (1), it is effective to make the magnetic domains finer in order to reduce the high frequency iron loss PL of the magnetic ribbon.

[Problems to be Solved by the Invention] In order to refine the magnetic domains as described above, (a) heat treatment in an oblique magnetic field, (b) introduction of scratches, (lX) introduction of partial crystallization, and (d) low magnetostriction. , (e) Measures such as particle dispersion have been attempted.

Among the above measures, (b) In the case of introducing scratch, R,
F. Krause and P. Werner (l.
EEE, Trans, Mag, MAG-17 (1981
), 268B) has been reported to significantly reduce eddy current loss.

The technical problem of the present invention is to develop the principle of the scratch method described above (b) and to provide a technique that allows it to function more efficiently.

[Means for Solving the Problems] According to the present invention, it is made of a material containing an elongated magnetic metal or an alloy, and is characterized by having scratches caused by polishing in the width direction over the entire length direction. A magnetic metal or alloy ribbon is obtained.

According to the present invention, while moving a long ribbon containing a metal or alloy in the longitudinal direction, the surface of the ribbon is brought into contact with the circumferential surface of a cylindrical grindstone rotating in a direction opposite to the direction of movement of the ribbon. In the surface polishing device for a magnetic metal or alloy ribbon, which has a cylindrical grindstone for polishing, the cylindrical grindstone has an inclined surface cut off obliquely with respect to the end surface, and this inclined surface has a W- D tan θ≧W (where θ is the inclination angle of the end face of the grinding wheel, and a surface polishing device for alloy ribbon can be obtained.

In the metal or alloy ribbon surface polishing apparatus of the present invention,
It has a supply section that supplies a long ribbon containing a metal or alloy under constant tension, a polishing section that polishes the ribbon, and a winding section that winds up the ribbon polished by the polishing section. Preferably, the polishing section includes a first grindstone for polishing the back surface of the ribbon and a second grindstone for polishing the front surface of the ribbon.

[Function] In the metal or metal ribbon surface polishing apparatus of the present invention,
A thin ribbon containing an elongated metal or alloy is supplied with a constant tension by the supply section and moves in the longitudinal direction. The cylindrical grindstone polishes the front and back surfaces of the 20-thin strip while contacting them in opposite directions in the moving direction. In other words, a cylindrical grindstone has a polishing surface with a width that is not similar to that of -W-D, for example, W-D Lanθ≧ω (where θ is the inclination angle of the end face of the grindstone, W is the width of the grindstone, D is the diameter of the grindstone, and ω is the width of the ribbon. A metal alloy ribbon is polished in a direction intersecting its longitudinal direction by having a grindstone or the like that satisfies the relationship (represented by .). In addition, by providing a pair of cylindrical grindstones for polishing the front and back sides, and using one of the grindstones as the first grindstone for grinding the back side of the ribbon and the other grindstone as the second grindstone for polishing the front side of the ribbon. The ribbon can be polished in the longitudinal direction and in a direction transverse to this longitudinal direction. In this way, the polished ribbon is wound up by the winding section.

[Example code] Embodiments of the present invention will be described with reference to the drawings.

9. FIG. 1 is a side view showing a magnetic metal or alloy ribbon polishing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view of the magnetic metal or alloy ribbon polishing apparatus of FIG. 1.

In these figures, the ribbon polishing device polishes a long ribbon 1.
The present invention is constructed by providing a supply section 20 that supplies the ribbon 1, a polishing section 30 that polishes the ribbon 1, and a winding section 40 that winds up the polished ribbon 1. The ribbon supply section 20 is
A ribbon reel 21 containing the ribbon to be polished, a tension controller 22, a ribbon reel 21 having one end thereof, the other end connected to the tension controller 22, and rotatable on bearings 24 and 25. It has a supported rotating shaft 26. The tension controller 22 adjusts the tension of the ribbon 1 supplied from the ribbon reel to a constant tension by pressing its side against the other end of the rotating shaft. Tension adjustment is performed by a tension adjustment spring 23.

The polishing section 30 is provided with a roll-shaped grindstone I (31) for polishing the back surface 1a of the ribbon, and a roll-shaped grindstone 1 (31) for polishing the front surface 1b of the supplied ribbon. It has a grindstone n (32).

The grindstone 31 is rotated by a shaft 33 and a drive motor 35 connected via a gear box 34 in a direction opposite to the direction in which the surface of the ribbon to be polished is moved.

The shaft 33 is mounted on the base 3 to which the drive motor is attached.
It is supported by bearings 37a and 37b provided at 6. The grindstone 32, like the grindstone 31, has a shaft 33' and a drive motor 3 connected via a gear box 34'.
Rotated by 5'.

The shaft 33' is supported by bearings 37a and 37b provided on the base 36' to which the drive motor is attached.

The take-up unit 40 rotates a take-up reel 42 which is attached to a drive shaft 41a of a take-up motor 41, and the polished ribbon is taken up at a predetermined speed.

FIG. 3(a) is a sectional view taken along line A-8 in FIG.
It shows 0.

In this figure, the main unit is fixed to a stand 51, and the drive motor 35 and bearings 37a and 37 are attached to a stand 36.
b is fixed. A grinding wheel I is fixed to one end of the shaft 11 by a fixing plate 39, and the other end is connected to a motor drive shaft via a gear box 34. The moving ribbon l is pressed against the circumferential surface of the grindstone 1 by a roll 38.

FIG. 3(b) is a diagram showing the shape of the grindstone. As shown in this figure, the grindstone according to the embodiment has a cylindrical shape in which both end faces do not have 11 rows. When the inclination angle of the end face of the grindstone is θ, the width of the grindstone is W1, the diameter of the grindstone is D1, and the width of the ribbon is ω, the relationship W=DLan θ≧ω is satisfied.

When this grindstone is rotated about its axis, the inclined end face draws a sinusoidal curve in the W direction at a period that matches the rotation period of this grindstone.

When an alloy ribbon is polished by the metal or alloy ribbon polishing apparatus according to the embodiment, the ribbon 1 wound around the ribbon reel is given a fixed tension by the tension controller 22, and the ribbon 1 is conveyed. Along the path 4, the grinding wheel I rotates in the opposite direction to the moving direction of the polished surface of the ribbon, that is, in the left direction 52, and the upper circumferential surface of the grinding wheel I is brought into contact with the upper surface of the grinding wheel I to polish the back surface 1a, and then the polished surface of the ribbon is moved. The grinding wheel H rotates in the opposite direction, that is, in the right direction 53, and the surface 2a is polished by contacting the upper circumferential surface of the grinding wheel H, which is then wound onto the take-up reel 42. If frictional heat is applied to the surface of the alloy ribbon during polishing, etc. , it may warp into a cylindrical shape. In this case, warping can be prevented by sufficiently cooling the alloy ribbon by lengthening the conveyance path 4 or providing a cooling device for the alloy ribbon in the conveyance path 4.

FIG. 4 is a diagram showing a comparison of surface polishing conditions by combinations of grindstones I and (2) actually used. As is clear from this figure, the appearance of surface scratches can be freely changed by combining the front and rear grindstones.

The roughness of the polished surface can be adjusted by the type of grindstone, and the pitch of scratches in the width direction of the plate can be adjusted by appropriately changing the rotation speed of the grindstone and the moving speed of the ribbon. The grain size of the grindstone should be fine, and the maximum roughness for finishing should preferably be 2 to 3 μm.6 The amount of polishing is 1 μm per polishing.By repeating this polishing several times, the thickness is gradually reduced.

Table 1. Implementation Condition Table 2 CO-based and Fe-based amorphous alloys were polished under the conditions shown in Table 1, and the roughness of the finished surfaces was examined.

The final finished plate thickness could be up to about 10 μm. The results are shown in Table 2.

FIG. 5 is a diagram showing the dependence of the iron loss P on the frequency f when scratches are made in the longitudinal and width directions of a CO-based amorphous alloy ribbon using the surface polishing apparatus according to the embodiment of the present invention. be.

In this figure, a solid line 11 including O indicates the state when scratched in the longitudinal direction, a solid line 12 indicated by . is the state when scratched in the width direction, and a solid line 13 indicated by X indicates the state before scratching. .

As is clear from the figure, the state before scratching (solid line 13) and the state when scratching in the direction of the first child (solid line 1)
In case 1), there is almost no difference, but the solid line 12 where scratches are made in the width direction and Pt are significantly reduced. This characteristic becomes especially significant in high frequency bands.

Regarding the grindstone used in the polishing device according to the embodiment of the present invention, which has a surface that is not perpendicular to the rotational axis of the grindstone, the non-perpendicular surface can be compensated with a resin block to maintain a disk shape with both end surfaces parallel to each other. .

[Effects of the Invention] As described above, according to the present invention, scratches can be provided on the front and back surfaces of a magnetic metal or alloy ribbon in the width direction and longitudinal direction as necessary.

Further, by providing scratches in the width direction of the metal alloy ribbon, iron loss can be reduced, which is extremely useful industrially.

[Brief explanation of the drawing]

Figure 1 is a side view showing a magnetic metal or alloy ribbon polishing apparatus according to an embodiment of the present invention, and Figure 2 is a side view of the magnetic metal or alloy ribbon polishing apparatus shown in Figure 1. Figure 3 (a) is the first
3(b) is a diagram for explaining the shape of the grindstone in FIG. 3(a), and FIG. 4 is a magnetic metal or alloy ribbon polishing according to an embodiment of the present invention. Equipment grindstone I and grindstone■
FIG. 5 is a diagram schematically showing the combination type and the surface condition of the ribbon after grinding. FIG. , is a diagram showing the relationship with iron loss. In the figure, 1 is a magnetic metal or alloy ribbon, 1a is the back side of the ribbon,
1b is the surface of the ribbon, 4 is a conveyance path, 20 is a supply section, 21 is a ribbon reel, 22 is a tension controller, 23 is a tension adjustment spring,
24 and 25 are bearings, 26 is a rotating shaft, 30 is a center part,
31 is a grindstone I, 32 is a grindstone (2), 33 and 33' are shafts, 34 and 34' are gear boxes, 35 and 35' are drive motors, 36 and 36' are mounting stands, and 37a. 37b, 37a' and 37b' are bearings, 38 and 38
' is a roll for holding down, 39 and 39' are fixed plates, 40
41 is a take-up motor, 41a is a drive shaft, 42 is a take-up reel, 51 is a stand for attaching to the main body, and 52 and 53 are arrows indicating the direction of rotation. Figure 3(b)

Claims (1)

[Claims] 1. A magnetic metal or alloy ribbon made of a material containing a long magnetic metal or alloy, characterized by having scratches caused by polishing in the width direction over the entire length direction. . 2. A method for surface polishing a magnetic metal or alloy ribbon, in which the surface of the ribbon is polished by bringing it into contact with a grindstone while moving the long ribbon containing the metal or alloy in the longitudinal direction. A method for polishing the surface of a magnetic metal or alloy ribbon, characterized in that polishing is performed by moving the ribbon relatively in a direction intersecting the longitudinal direction of the ribbon. 3. A cylindrical grinder that polishes a long ribbon containing a metal or alloy by bringing the surface of the ribbon in contact with the circumferential surface of a cylindrical grindstone that rotates in the opposite direction to the direction of movement of the ribbon. In a surface polishing device for magnetic metal or alloy ribbon having a grinding wheel,
The cylindrical grindstone has an inclined surface cut off obliquely with respect to the end surface, and the inclined surface satisfies W=Dtanθ≧ω.
(However, ω is the inclination angle of the end face of the grinding wheel, W is the width of the grinding wheel, D is the diameter of the grinding wheel, and ω is the width of the ribbon). .