JPH0687570A - Bobbin holder - Google Patents

Abstract

PURPOSE:To improve characteristic frequency and reduce moment of inertia while improving surface hardness and reducing the coefficient of friction so as to enable super-high speed rotation by covering the surface of a body, formed of carbon fiber reinforced compound material, with a ceramic or metal flame- sprayed coat. CONSTITUTION:The surface of a body 1 made of carbon fiber reinforced compound material is covered with a ceramic or metal flame-sprayed coat 3. At this time, it is desirable to form a bond-coating layer 2 including a filler with complex unevenness between the body 1 and the flame-sprayed coat 3. Since the body 1 is formed of carbon fiber reinforced compound material, the characteristic frequency is improved, and moment of inertia is reduced. Also since the surface of the body 1 is covered with the ceramic or metal flame-sprayed coat 3, surface hardness is high, and the coefficient of friction is reduced so as to be fit for high speed rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin holder for a high-speed winder mainly used in the textile industry.

[0002]

2. Description of the Related Art Conventionally, most bobbin holders of winding machines used for winding fibers are made of steel.

However, in recent years, the winding speed of fibers tends to be remarkably increased, and conventional winding machines cannot cope with various points. In particular, there is a remarkable increase in the spinning speed of polyester fibers, and there has been a demand for one capable of winding up to a maximum of about 10,000 m / min as a speed of a winding machine. The most bottleneck in the conventional technique for achieving such speeding up is the limit of the natural frequency derived from the material of the bobbin holder. That is, since the conventional bobbin holder is made of steel, it is no longer possible to increase the specific elastic modulus that determines the value of the natural frequency, and therefore it becomes unusable due to resonance at the time of operation at high speed. It is the current situation.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and improves the natural frequency and the moment of inertia, as well as the surface hardness and the friction coefficient to achieve ultra-high speed rotation. The purpose is to provide a bobbin holder made possible.

[0005]

That is, according to the present invention, as shown in FIG. 1, a bobbin holder in which the surface of a main body 1 made of a carbon fiber reinforced composite material is coated with a thermal spray coating 3 of ceramic or metal, preferably a main body. 1 and the thermal spray coating 3,
It is a bobbin holder in which a bond coat layer 2 containing a filler having complicated irregularities is interposed.

In the bobbin holder of the present invention, the main body is made of the carbon fiber composite material, so that the specific elastic modulus can be remarkably increased as compared with that made of metal.

That is, since the lateral natural frequency which is a problem here is proportional to the specific elastic modulus as shown in the following equation, it is convenient to use the carbon fiber reinforced composite material having a high elastic modulus and a small specific gravity.

F = α (ZIg / A) ^1/2 formula f: natural frequency (Hz) α: coefficient determined by supporting conditions (mm ^-2 ) Z: specific elastic modulus (mm) I: cross section of pipe 2 Next coefficient (mm ⁴ ) A: Cross-sectional area (mm ² ) The table below shows metallic materials and carbon fiber reinforced composite materials (CFR).
The specific elastic modulus of P) shows how the specific elastic modulus of the carbon fiber reinforced composite material is high.

[Material] [Specific elastic modulus (mm)] Steel 2.67 × 10 ⁹ aluminum 2.59 × 10 ⁹ CFRP ^{9 to} 29 × 10 ⁹ The axial specific elastic modulus of CFRP is the ratio of steel or aluminum. The value is preferably higher than the elastic modulus, but the value is not particularly limited. Further, the type of carbon fiber and the type of matrix resin used are not limited, and the manufacturing method of the CFRP main body is not particularly limited, and filament winding, sheet wrapping, and other methods can be used.

By using the CFRP as described above, it is possible to improve the natural frequency and reduce the moment of inertia during rotation, but it is impossible to actually use the CFRP alone as a bobbin holder. Is. That is, since the surface of the bobbin holder is rubbed by the metal bobbin parts, high hardness is required, and the conventional steel bobbin holder has been used with its surface plated with chrome. In addition, since multiple bobbins such as 2 to 8 bobs are taken up in winding, it is necessary to apply a uniform axial force to all bobbins. Therefore, even if the coefficient of friction with bobbins is at least the conventional bobbins. It is necessary to make it chrome plated as well as the holder. In order to satisfy such requirements, in the present invention, a ceramic or metal spray coating is coated on the surface.

Plasma spraying is an excellent method for spraying a ceramic or metal on the surface of the CFRP body, but the surface of the CFRP body is melted because the spraying temperature is so high that the CFRP surface is not exposed. Spraying may not be possible if the treatment is left as it is. Even if thermal spraying is possible, a large tensile stress may be generated in the thermal spray coating due to centrifugal force during use because it is used at an extremely high speed, and the thermal spray coating may be destroyed. In order to solve such a problem, the action of dissipating heat on the CFRP surface during thermal spraying between the CFRP layer and the thermal spray coating,
It is desirable to interpose a bond coat layer having a function of imparting strong adhesion between CFRP and ceramic or metal.

As a bond coat material having such an action, there is a bond coat NS-2 manufactured by Mitsubishi Rayon Co., Ltd.
6 or NSU-26 exhibits excellent performance. That is, since these bond coat materials contain a filler composed of fine Ni particles having complicated irregularities, they have particularly good thermal conductivity and can be sprayed without melting the CFRP surface. Further, since a myriad of irregularities are formed on the surface of the bond coat, it exerts a very strong anchoring effect and imparts a strong adhesion strength. Therefore, even when rotating at an ultra-high speed, the distortion due to the deformation of the ceramic or metal is almost influenced by the distortion of CFRP, so that the destruction of the ceramic or metal does not occur.

As for the material of the thermal spray coating that covers the surface, high hardness and low friction coefficient are required as described above.
Alumina type,
Alumina / titania-based, titania-based, chromia-based, zirconia-based, or carbide-based materials such as tungsten carbide or tungsten-cobalt and alloys such as nickel, chromium and tungsten are effective.

In particular, among these, the chemical formula Al ₂ O ₃ .4
Those represented by 0TiO ₂ , Al ₂ O ₃ , WC · Co, Cr ₂ O _{3 and the} like are particularly preferable.

[0015]

EXAMPLES The present invention will be described in more detail based on the following examples.

Example 1 In this example, a length of 940 mm, an inner diameter of 69 mm, and an outer diameter of 8
Maximum speed of 25,000 rp for winding 0 mm polyester
I made a super high speed bobbin holder of m.

First, carbon fiber is sequentially wound on a steel mandrel at a winding angle of 90 °, ± 10 °, 90 °, ± 10 ° while being impregnated with an epoxy resin using a filament winder, and after curing, the mandrel is used. It was demolded and cut into a predetermined size to manufacture a blank tube. Next, after bonding the boss to the inner diameter of the raw tube, finishing of the inner diameter of the boss and polishing of the outer diameter of CFRP were performed. Next, bond coat NS-26 manufactured by Mitsubishi Rayon Co., Ltd.
Was coated with a coating machine having a thickness of 0.1 mm, and its surface was subjected to ceramic spraying by a plasma spraying method.

Alumina / titania (Al ₂ O ₃ .40 TiO ₂ ) was used as the material of the ceramic. The thickness of the ceramic sprayed coating at this time was 0.4 mm, but this was polished to a thickness of 0.25 mm. Finally, the dynamic balance was adjusted to obtain the final bobbin holder.

The elastic modulus of the carbon fiber E = 4600
High-elasticity carbon fiber Pyrofil (registered trademark) HS40 manufactured by Mitsubishi Rayon Co., Ltd. having a weight of 0 kg / mm ² was used.

The dimensions and physical properties of the finished CFRP body were as follows.

The inner diameter of 69 mm, an outer diameter of 79.3mm, length 940mm axial elastic modulus 20900kg / mm ² circumferentially elastic modulus 4000 kg / mm ² axially specific modulus 13.2 × 10 ⁹ mm circumferentially specific modulus 2.53 × 10 ⁹ mm The natural frequency of this bobbin holder is 580 from the tip.
When I received a mm boss with a boss and did a dry run, it was 3
The speed was 0000 rpm, which was very high, and was sufficiently practical.

When the surface hardness of this alumina-titania was measured by a micro Vickers, it was H _V = 760, which was very high.

Further, the coefficient of friction with the mating metal (tough lam treatment on aluminum) was smaller than that of the chrome-plated products currently used in the market, and exhibited good performance.

The total weight of the bobbin base material, the bond coat, and the ceramic is 2.08 kg, which is 1 / 4.5 compared to 9.5 kg when the conventional steel is used.
The power required for rotation can be reduced as follows.

[0025]

According to the present invention constructed as described above,
Since the main body is made of carbon fiber composite material, the natural frequency is improved and the moment of inertia is reduced, and the surface of the main body is coated with a ceramic or metal spray coating, so the surface hardness is Provided is a bobbin holder suitable for high-speed rotation having a high friction coefficient and a low friction coefficient.

[Brief description of drawings]

FIG. 1 is a sectional view of a bobbin holder according to the present invention.

[Explanation of symbols]

 1 Main body of CFRP bobbin holder 2 Bobbin coat layer 3 Ceramic sprayed coating 4 Bearing boss

Claims (2)

[Claims] 1. A bobbin holder characterized in that the surface of a main body made of a carbon fiber reinforced composite material is coated with a ceramic or metal spray coating. 2. The bobbin holder according to claim 1, wherein a bond coat layer containing a filler having complicated irregularities is interposed between the main body and the thermal spray coating.