DE1287709B - - Google Patents

Description

1 2

The invention relates to a method of manufacturing the magnetic tape to be treated one for use with elevated material 30 is located. The driving roller 25 and the AufTemperaturen suitable ferromagnetic tape, winding roll 26 pull the tape material over a Cut tape or layer core. Variety of castors 11 through a series of

From the German patent specification 399 167 is already 5 baths, which are marked with 12 to 19. The one method for producing subdivided magnetic-magnetic tape material 30 is first known in a core. This process is followed by the degreasing bath 12 in order to remove any traces of oil from the production of individual sheets or grease. The container 13, into which the set magnetic core uses a binding agent, magnetic strip material next enters, is a welding or sintering of the water spray system to spray the degreasing solution from metal sheets even at temperatures such as those at the end of the strip. Subsequent to the spray annealing the magnetic cores are necessary, prevented. In addition, the tape is fed into the container 14, which contains this binding agent, which can consist of glass, porcelain or a pickling solution to remove any similar substances, is used in this case to contain oxides adhering to the surface of the tape and processes during the annealing for melting 15 serves to etch the surface. There is a row brought and flows around the individual sheet metal parts. of suitable pickling solutions, such as. B. HCl, H ₂ SO ₄ , After cooling, the individual parts of the magnet - solutions of these two acids and solutions of the core are mechanically fixed by the binding agent - H ₃ PO ₄ . After the pickling treatment, the magnesia is held together. tables led tape material in the container 15, where

However, this known method has the 20 a second water spraying of the tape to the elimination disadvantage, that the pickling solution is made to prevent welding. The container 16 placed between the individual layers of the core contains a nickel bath for plating the magne-substances when handling the core table tape. This is between the electrodes 32 can move easily, so that they are not brought together and a thin layer of nickel Form hanging layer more and in places 25 deposited on it. The transformer 31 direct contact with the adjacent sheet metal layers supplies the necessary electrical current for this takes place. When annealing a core, the cladding process welds.

then the sheet metal layers in these places. This is after the deposition of the nickel layer

the magnetic properties of the core of the tape in the container 17 are reassigned with water but deteriorated considerably. 30 hosed. This is followed by a neutralization bath 18,

The present invention avoids these in the any acid residues from the foregoing disadvantages. The treatment undergone by the process according to the invention can be neutralized. As a neutralizing agent suitable for use at elevated temperatures, a ferromagnetic tape, 0.02% aqueous solution of Na ₂ CO ₃ , suitable for temperatures, can be used here. In the container 19, the tape is then passed through the thoroughly cleaned ferromagnetic tape or an acetone bath in order to first remove traces of water from the sheet metal, a thin, inorganic, glass-like, tape surface. Dry fans 33 stickable and electrically insulating substance accelerate the evaporation of the acetone. Then it is melted and that then the band passes the last roller to get the core wound over the insulated band or sheet metal or 40 drive roller 25 to get to the take-up roller 26, is layered, whereupon the core for annealing in motor 27 and disks 28 and 29 these drive an oven inserted and mechanically in the manner of last rollers.

is loaded that the individual tape or sheet metal layers. The nickel obtained by this process lie tightly on top of one another, so that the core subsequently consists of a very thin layer of precipitate Tension-free annealed, at the same time the vitreous 45 nickel. This is therefore particularly desirable Substance for bonding the adjacent strip or as a separating layer between the silicon-iron sheet metal layers brought to soften and that closing straps and the casing is used. In absence lent the core to solidify the vitreous substance of this separating layer, FeO can enter the glass cladding and thus diffuse in order to fix the adjacent sheet metal layers and their composition is cooled down to damage will. Change a 5 ° way through these procedural steps.

obtained tape core can then be converted into C-shaped A b b. 1 shows a possible arrangement of

Core halves are cut. Baths to create a clean and dry,

For a better understanding of the invention, reference is made to a nickel-deposited magnet the following description and the drawings of the rear tape material. But others can too instructed. It shows ~~ 55 combinations that are also used for

A b b. 1 schematically, the pretreatment of this desired purpose are very suitable.
Surface of an iron-silicon sheet metal strip for the After this surface treatment, the

Method according to the invention, magnetic tape material with a thin, liquid,

Fig. 2 also schematically provided a device glass-like cladding. A suitable one for the subsequent cladding of the pretreated device for carrying out this process step Tape with a vitreous substance, is in A b b. 2 shown. The magnetic tape

A b b. 3 a perspective section through material 30 is taken from a supply roll 40 and a glued cutting tape core, fed to a trough 43 via the guide roller 41.

A b b. 4 is an enlarged sectional view of a plurality of The guide roller 42 is in the trough liquid under sheet metal layers of the core according to Fig. 3, which is immersed according to the 65. The trough liquid consists of a suspen invention by the vitreous substance together sion of vitreous particles in a suitable are glued. organic carriers, such as. B. amyl acetate or

In A b b. 1 means 10 a decoiler, on isopropyl alcohol. In this one becomes the magnetic

Provide tape material with a thin covering, the thickness of which depends on the speed with which the tape material is pulled through the trough liquid, or by the consistency of the solution. Superfluous The suspension drips back into the binder trough, as the tape is led out vertically from the binder solution will.

The belt 30 ascends through a set of infrared dry lamps 44 which carry the suspension dries to a loosely adhering layer of powder. The tape prepared in this way then passes the Tube furnace 45 with its heating elements 46, in which the powdery coating becomes a thin coherent Coating is melted, which covers the entire surface of the tape. It must it should be noted that the device is constructed in such a way that the belt surface as long as it does carries loosely adhering powder, has no contact points with other parts. The glassy Casing quickly solidifies as it emerges from the tube furnace, and the tape passes a series of Castors 47 and the drive roller 51, which pull the magnetic tape down to move from the Roll 52 to be included. The last two rollers are driven by the motor 53 over the discs 56 and 55 driven.

Although in the foregoing the immersion technique was highlighted as a possibility for wrapping the tape it can also be seen that the suspension is moved by suitable rollers or by a Spray technology can be applied.

In practicing the method of the invention, the nature of the glass must be taken into account. It is well known that the viscosity of a glass continuously decreases as the temperature increases because the glass does not have an accurate melting point. This viscosity-temperature relationship of a glass depends on its special composition. At room temperature, the glasses that are used in this process according to the invention are completely rigid and have viscosities of 10 ¹⁷ poise and higher. In order to achieve the desired thin, homogeneous, molten glass insulation coating on the surface of the tape, the glass particles must be heated to a liquid consistency, which is characterized by a viscosity of approximately 5000 poise. After the core has been wound, the annealing of the core and the simultaneous gluing of the wound sheet metal layers are carried out at a softening point of the glass of approximately 825 ° C. At this temperature the glass has a plastic condition which corresponds to a viscosity of approximately 10 poise. At this viscosity, the glass melts and binds the individual sheet metal layers together when they are in close contact. The glass-bonded cores of this invention therefore have a maximum application temperature which is as high as the temperature of the deformation point of the glass (corresponding to about 10 ¹¹ to 10 ^ia poise). At the deformation point, the glass-bonded core loses its internal strength, which can destroy the core.

The choice of glass depends on the use temperature and the annealing temperature required for the core is needed from. Glasses in which the glass formers contain at least one of the oxides of silicon, boron or phosphorus can be used in this process if they suit the application and Correspond to annealing temperatures. Mixtures of these glass formers can also be used. There is countless combinations of glass components that produce satisfactory results in this process. With regard to higher operating temperatures, the requirements are more stringent, so that the number of recommended glass compositions is restricted. In the examples for the inventive Procedure given is that as

ίο Cladding material used glass from adapted Composition that makes it particularly suitable for treating magnetic tape material. In particular, the softening point of the glass is chosen so that it is in the same temperature range in which the stress-relieving annealing of the magnetic tape also takes place. However, it is not necessary condition for all applications. For example, the softening point of the glass are significantly lower than the required annealing temperature

ao rature of the magnetic core, however, have such cores a relatively low temperature limit in use. The upper temperature limit is thereby given that the glass must have a viscosity at the temperature of the stress relief annealing which is sufficient to allow the glass to adhere to the metal band, but it is not yet so low that the Glass runs down from the metal strip in a thin liquid.

The following concentration information for the

Glass compositions have been found to be particularly suitable for silicon-iron magnetic material. she are listed in Table I.

Table I.

Composition of the glass cladding
in percent by weight

Composition Preferably area composition 36.00 to 54.65 41.92 5.05 to 18.00 11.70 2.00 to 7.35 4.88 3.65 to 18.00 17.55 7.00 to 30.45 6.82 0.00 to 10.00 -. 0.00 to 5.00 4.88 0.00 to 20.90 9.75 0.00 to 4.05 - 0.00 to 1.35 - 0.50 to 1.00 0.50 0.50 to 1.00 0.50 0.50 to 1.50 1.50

SiO ₂ .
B ₂ O ₃ .

AI ₂ Oj

Na ₂ O
K ₂ O.

CaO.

CaF ₂

BaO.

ZnO.
ZrO ₂

MnO,

NiO ..

CoO.

In this composition, the boron oxide content can be reduced to 2% or less.

Potassium oxide can be substituted for sodium oxide.

Manganese, nickel and cobalt oxides may be absent.

Other glass compositions are also suitable

Bräuchlich, glasses that are up to 15% ZrO ₂ and 15 have ° / ₀ TiO _2, can on the basis of the above information is also used 6a.

For the preparation of the glass slurry, the glass was wet in a ball mill for 54 hours ground. After milling, the millbase was passed through a 400 mesh screen to remove coarser particles. The average particle size after sieving was around 1.5 μm.

To allow the glassy particles in suspension. Such a wound and in two parts 61

hold, it is common to have a suspension stabilized and 62 cut core 60 is shown in Fig. 3,

add sator to the slurry. Such one where the cut surfaces 63 are as flat and smooth as possible

Suspension stabilizer is not designed to run after one, so after assembling

Prior art proposal, e.g. B. the 5 of the core halves the window 64 without noticeable

Boric acid ester of 2-methyl-2,4-pentanediol, which is also formed in an air gap.

commonly referred to as trihexylene glycol biborate In A b b. 4 are shown in an enlarged view. Section of two bonded tape layers 100 and 101 of a. The throughput speed of the magnetic core produced according to the invention is shown. Each sheet metal strip through the front of the strip layers shown in Fig. 2 is surrounded with a molten glass direction for cladding the pretreated strip. The glass layer 104 represents that with the vitreous substance was about 0.9 to 1.5 m glass covering on the outer band layer 100. Per minute. The thickness of the molten glass The intermediate layer 106 glues the tape layers 100 sheathing on the magnetic sheet metal tape and 101 to one another in an insulating manner. The glass layer 108 in the order of about 2.5 to 25 μm or 15 insulates the edges of the windings. Which are more in Fig. 4. visible metal surfaces at the same time indicate the cutting

The temperature in the furnace was about 850 to the surface of the core.

950 ⁰ C. This temperature depends on the velocity nuclei, which in accordance with this working

The speed with which the strip runs through, and it depends on how they were manufactured, were further dependent on the strip cross-section at temperatures. A higher temperature-ao up to 600 ⁰ C without adversely affecting the adhesive effect

temperature is aged at higher belt speed or at or when the dimensional stability is reached,

larger band cross-section applied. In the furnace transformer cores were in compliance

softens the glass and flows together and produced with this invention and on them the

melts into a bubble-free, homogeneous casing. Core losses are determined. For this purpose, refer to the following of the magnetic tape. 25 examples pointed out.

The tape material encased by this process

is of remarkable flexibility, which is in complete contrast to the otherwise brittle behavior of the

Glass stands. As the starting material for the wound cores, the extreme flexibility of the glass-clad 3 ° was also used with simply oriented silicon steel sheet

Tape enables the cores to be at room temperature - 3.5 ° / ₀ silicon and a thickness of 0.05, 0.10 and

temperature can be wound without the adhesive 0.30 mm. The sheet metal surfaces were clean; the

Strength of the glass cladding on the sheet metal destroyed. Sheet metal was cut into strips about 25 and 57 mm wide

will. Therefore, it can be cut up at room temperature for that. The magnetic tape was through a Wrapping of the cores conventionally, sent with a great deal of 35 series of baths, in which

speed machines are used. followed by degreasing, pickling and precipitation

Such machines can have a core made of a nickel layer on the tape.

Size with a variety of turns of tape in very The composition of the glass cladding of the

few, z. B. wrap in 2 or 3 minutes. Kernes was the following:

It can be seen that the winding of the cores 4 °

Introduces stresses in the magnetic material and sheath, given in percent by weight

that these tensions must be removed. Furthermore SiO ₂ 42.49

the adjacent sheet metal layers of the core must B ₂ O ₃ 2.44

glue together to give the core its final Al ₂ O ₃ 3.63

To give shape. It was found that a after 45 Na ₂ O 21.75

the above process, with a glass K ₂ O 0.02

clad core provided with a certain TiO ₂ 9.11

Annealing temperature in a single process step ZrO ₂ 12.33

could be both relaxed and glued. BaO 5.38

To do this, the pre-fabricated core became 5 ° CaO 0.01

placed in a furnace and attached to the intended ZnO 2.85

Interface weighted to one

Contact between the adjacent tape layers to ensure the magnetic tape was in a device. The core was then heated to a temperature according to A b b. 2 heated with a glass casing temperature of about 700 to 900 ^{0 C.} Provided in some 55 of the above composition. For this purpose, the felling, the annealing temperature can be higher, e.g. B. The tape is first sent through a container that is 1000 ⁰ C; the temperature used depends on what a slurry of glass particles contained. The magnetic material from this treatment slurry was dried on the belt so is subjected. Grain-oriented silicon-iron that the glass particles in powder form adhered to the tape, annealed at 835 ° C. for 3 hours with good results. Subsequently, the tape was to be through a. In general, an annealing time of 1 to furnace with a temperature of 915 ° C is sent. Applied at hours. This treatment is at this temperature, the glass particles melted sufficiently to relax the material and to put them together and thereby formed a thin, equal-bonding of the adjacent strip layers of the core-shaped glass cladding of the magnetic sheet by melting the glass cladding. The speed at which the tape passed through the slurry and the furnace was about 1.2 m per sufficient strength to allow the core to be cut in minutes. The wrapped and cooled tape was wound into a supply roll using conventional equipment without peeling. After that were

from this tape wound magnetic cores using appropriate mandrels on conventional winding machines. The cores were left on the mandrel to ensure the dimensional accuracy of the window and core dimensions. The dimensions of the core window were either 22.2 × 57.2 mm ² with a winding thickness of 9.5 mm or 25.4 × 76.2 mm ² with a winding thickness of 25.4 mm. When winding the cores, some additional layers were applied.

The cores were then stacked in an oven in such a way that a steady load rested on the future interfaces of the core. A gas with the composition 90% N ₂ and 10 ° / ₀ H _{2 was then introduced} into the furnace and the cores were annealed at 825 ° C.

The glow time was 3 hours; the fixed cores were then removed from the oven, allowed to cool, and the mandrels still stuck in the cores are ejected by means of hydraulic presses.

The cores were clamped between approximately 1.5 mm thick steel plates and using a cutting disc cut up. The cut surfaces of the core were made on the diamond wheel of a surface grinder polished. The surfaces of the core were then etched to remove abrasive burrs remove.

The core halves were cut to the appropriate size by removing the excess outer and inner windings exactly to the desired window dimension and winding thickness. The core halves were carefully aligned and combined into a core after a coil was pulled over one leg of the core. The entire core was kept in a functional order by a folded steel band. Subsequently, the core losses were determined at room temperature after aging for 250 and 500 hours at 400 ⁰ C. Other cores were aged at 600 ⁰ C. The cores had relatively low core losses both before and after aging.

A core series was made in accordance with the invention and contributed to core losses Checked room temperature, which resulted before and after aging. The results are in Table II reproduced. Three symbols are used in each of Table II to identify the C-shaped core samples used. The marking consists of a number (1 and 2), a letter (L, H and A) and a number (1 to 8). The numbers in front of the letter indicate the core size as follows:

number 1

The cores have a band width of 25.4 mm, a window of 22.2 × 57.2 mm ² and a winding thickness of 9.5 mm;

number 2

The cores have a band width of 57.2 mm, a window with 25.4 x 76.2 mm ² and a winding thickness of 25.4 mm.

The letters indicate the band thickness of the steel band used for the core.

Letter L = 0.05mm,
Letter H = 0.10 mm,
Letter A = 0.30 mm.

A two-digit combination of the above symbols indicates the core type. The numbers 1 to 8, which follow the letters indicate the sample number. For example, the combination means 2H4 the fourth sample of the core type 2 H, which is the core with the larger dimensions and a tape thickness of Corresponds to 0.10 mm.

Table II Core losses in watts per kilogram at 15 kg, 400 ^° C. aging temperature

treatment

ILl 1L2 2Ll 2L2 IHl 1H2 2Hl 2H2 IAl 1A2 2A5 19.1 16.5 14.7 18.0 21.3 19.1 20.6 17.6 1.71 1.71 1.80 23.1 18.7 18.7 20.2 21.3 20.4 25.7 24.4 1.73 1.71 - 24.2 19.8 19.5 21.3 21.7 20.4 26.4 26.4 1.84 1.73 - 22.6 19.1 19.1 20.2 22.4 21.5 25.1 22.8 1.93 1.91

Before aging,
measured at room temperature

After 250 hours of aging
measured at 400 ^° C

After 500 hours of aging,
measured at 400 ^° C

Measured after aging,
at room temperature

The cores of the L and Η series were tested at 400 Hz, the cores of the Α series at 60 Hz.

The reject limit for the evaluation of cores bonded with organic resins is generally considered to be a core loss of 22 W per kilogram for the "H" type, while a reject limit of 1.98 W per kilogram applies to cores of the "A" type. The table above can therefore be seen to apply. It can therefore be seen from the above table that the cores according to the invention have satisfactorily low core losses before aging at room temperature, and that furthermore, after aging for 250 hours at 400 ^° C., all "A" cores and still some "H" cores have their core losses are within allowable limits. Furthermore, the number of cores which exceeds the reject limit has not increased ^{after aging at 400 ° C. for 500 hours.} However, it should not be forgotten here that cores which are bonded with organic resins cannot be subjected to such tests, since they would be destroyed at these test temperatures, and that therefore reliable measurements cannot be obtained.

909 504/1502

Another important aspect of this invention is that for the casing The glass used has a lower coefficient of thermal expansion than the metal. So if that Glass-clad metal cools from the annealing temperatures, the metal contracts more strongly than that Glass. The metal is therefore under tensile stress, while the glass is under compressive stress is located. However, it is known that when magnetic sheets are under tensile stress, the magnetostriction of the sheet decreases. As is well known, the magnetostriction for the Humming the transformer cores is responsible is by reducing the magnetostriction the noise level of the transformer is reduced by means of the glass cladding.

The inventive method simplifies the production of magnetic cores considerably in that instead of insulating the sheets with magnesium phosphate powders and with organic resins Glass cladding occurs; further also in that a single annealing treatment is possible while at Cores bonded with organic resins, the stress relief annealing and the aging treatment must be done separately.

The method according to the invention can be applied to any metallic strip material, both for oriented and for non-oriented material. The method of the invention was aluminum-sheet tapes iron applied with 12% aluminum and 3.5 ° / ₀ silicon-iron sheet metal strips also on, and also on strips of soft magnetic cobalt-iron alloys containing 27 and 35 ° / ₀ Cobalt. The cores were made from metal sheets that were 0.05, 0.10, 0.13, 0.20 and 0.30 mm thick. C-cores were made with widths of 9.5, 22.2 and 57.2 mm. In the same way, toroidal tape cores and cores stacked from stamped parts were produced, in which the stamped parts were obtained from sheet metal clad with glass.

Claims (4)

Patent claims: 1. Method of making one suitable for use at elevated temperatures ferromagnetic tape, cut tape or layer core, characterized in that that on the thoroughly cleaned ferromagnetic strip or sheet a thin one inorganic, vitreous, adhesive and electrically insulating substance is melted and that The core is then wound or layered from this insulated strip or sheet metal, whereupon the core is placed in a furnace for annealing and is mechanically loaded in that way is that the individual tape or sheet metal layers lie tightly on top of each other that then the Core annealed stress-free, at the same time the vitreous substance for bonding the neighboring ones Brought band or sheet metal layers to soften and that finally the core to solidify the vitreous substance and thus cooled to fix the adjacent sheet metal layers and optionally cut into C-shaped core halves. 2. The method according to claim 1, characterized in that when using iron-silicon sheets Before the glass-like cladding is applied, a very thin layer of nickel is applied to the iron-silicon sheet as a separating layer will. 3. The method according to claims 1 and 2, characterized in that the glass-like casing is applied in a thickness of 0.002 to 0.025 mm. 4. Process according to claims 1 to 3, characterized in that the annealing of the cores produced from the strip or sheet metal provided with the glass-like cladding is carried out at temperatures of 700 to 1000 ^° C. for a period of 1 to 4 hours. 1 sheet of drawings