JPH0643648B2 - Ring for spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a ring for a spinning machine, which has excellent wear resistance, corrosion resistance, and sliding characteristics.

<Problems to be Solved by Conventional Method and Invention> In the conventional spinning ring, steel or iron-based sintered parts are generally used after being subjected to surface hardening treatment such as carburizing and quenching treatment.

However, under the harsh operating conditions in today's spinning factories, conventional spinning rings lack wear resistance, causing early wear, causing the traveler to run unstable and causing frequent yarn breakage,
There were many fluffs, and there was a drawback that the traveler was seized and scattered early and the life of the ring was shortened.

In addition, when spinning flame-retardant fibers such as polyvinyl chloride fiber, vinylidene chloride fiber, modacrylic fiber, etc., the spinning ring rusts and disturbs the tune, so a method of applying metal plating to the surface of the spinning ring is also adopted. However, this method has a drawback that the plating peels off and rusts when the traveler travels.

Further, from the viewpoint of spinning efficiency, there is a demand to increase the number of rotations of the spindle, but the conventional spinning ring is used at a spindle rotation speed of about 12,000 to 15,000 rpm. However, there was a drawback that seizure, yarn breakage, etc. became remarkable and could not be put to practical use.

<Means for Solving the Problems> With respect to the above problems, the inventors of the present invention have diligently studied for the purpose of obtaining a ring for a spinning machine having excellent wear resistance, corrosion resistance, and sliding characteristics, and as a result, contact with at least a traveler. When the surface of the spinning ring is made of silicon carbide ceramics having specific physical properties, it is possible to achieve the above object and dramatically improve the high-speed sliding characteristics of the traveler, and to achieve a high spindle rotational speed. They have found the present invention and completed the present invention.

That is, the present invention relates to a spinning machine in which at least the surface in contact with the traveler is made of silicon carbide ceramics having a porosity of 0.5% by volume to 15% by volume and an average pore diameter of 0.3 µm to 3.0 µm. To provide a ring for use.

Hereinafter, the present invention will be described in more detail.

The spinning ring to be the subject of the present invention is not particularly limited as long as it is usually applied for spinning, for example, a single flange ring, a vertical ring,
Examples include a conical ring.

These are, at least, a flange portion of a ring for a spinning machine made of a carbon steel or an iron-based sintered product known in the art, which is in contact with a traveler, is formed of a silicon carbide ceramic molded body, and is fitted with a body portion,
Alternatively, although formed by bonding, a molded body obtained by integrally molding a spinning ring with silicon carbide ceramics and firing it may be used from the viewpoint that there is no fear of peeling during continuous long-term use.

The silicon carbide-based ceramics that constitutes at least the portion of the spinning ring that contacts the traveler has a porosity of about 0.5% to 15% by volume, preferably about 1% to about 10% by volume.
And having an average pore diameter of about 0.3 μm to 3.0 μm, preferably about 0.4 μm to about 2.0 μm.

If the porosity is less than about 0.5%, the effect of preventing metal adhesion is insufficient, and if it exceeds about 15%, the steric hindrance against the sliding of the traveler becomes large and the sliding When the characteristics deteriorate and the pore size is smaller than about 0.3 μm, the adhesion of metal increases and the friction coefficient increases, while when it exceeds about 3.0 μm, it is a obstacle to the sliding of the traveler. After all, friction increases.

The silicon carbide-based ceramics used in the present invention have an average particle size of about 0.3 μm to about 5.0 μm, preferably about 0.4 μm.
The content of free carbon is about 0.6 to about 5.0% by weight, preferably about 0.6 to about 4.5% by weight, and Ra is about 0.03 μm or more. About 0.50
It is desirable to have a surface roughness of less than μm, preferably about 0.08 μm to 0.30 μm.

When the size of the free carbon particles of the silicon carbide ceramics is outside the above range, the friction coefficient tends to increase, and when the free carbon content is less than the above range, the effect of preventing metal adhesion is insufficient. On the other hand, if the number increases, steric hindrance tends to increase with respect to the sliding of the traveler.

The ring surface roughness can be adjusted by polishing the surface of the silicon carbide sintered body by a known method such as buffing or barrel polishing when forming the ring.

When the surface roughness of the silicon carbide sintered body forming the ring is less than about 0.03 μm, metal adhesion and the like increase and the coefficient of friction increases, while when it exceeds about 0.5 μm. , The physical resistance to sliding becomes large.

The method for producing a silicon carbide sintered body applied to the present invention is not particularly limited as long as it is a method capable of forming a silicon carbide surface satisfying the above surface characteristics, but as a sintering aid for silicon carbide powder, boron is used. Alternatively, the boron compound as boron is about 0.02% by weight to about 0.3% by weight, preferably about 0.02% by weight.
05% to about 0.13% by weight, 2% to 10% by weight, preferably about 4% by weight of carbon or a carbon-containing substance as carbon.
Wt% to about 8 wt% is added and molded and then pressureless sintered,
A method of obtaining a sintered body having a sintered density of 2.9 g / cm ³ or more and a crystal grain size of less than about 10 μm is adopted.

The silicon carbide sintered body obtained by the above-mentioned method is preferable because it exhibits excellent mechanical strength, corrosion resistance and thermal conductivity.

The silicon carbide sintered body is an equiaxed crystal as a crystal structure constituting the sintered body, depending on the raw material powder used and the firing conditions of the molded body.
Alternatively, although there exist non-equiaxed crystals or mixed crystals thereof, those having any crystal form may be used in the present invention.

It is not clear why the spinning ring composed of silicon carbide ceramics having specific physical properties at least on the surface in contact with the traveler of the present invention shows excellent sliding characteristics, but it is not clear that silicon carbide has high hardness. In addition to the properties that silicon carbide originally has, such as the fact that it has no surface deterioration because it has, and has excellent heat dissipation compared to oxide ceramics and silicon nitride,
Specific pores present on the surface of ceramics are incorporated with carbon or carbide generated by carbonization of fibers during spinning to promote sliding of the traveler and ring, and in general, free carbon having a graphite type crystal structure is remarkable. It is presumed that it improves the sliding characteristics.

<Effects of the Present Invention> The spinning ring having a surface which comes into contact with at least the traveler made of the silicon carbide based ceramics of the present invention described in detail above, in particular, the silicon carbide based ceramic having specific pores on the surface is made of a conventional material. It has excellent corrosion resistance and wear resistance as compared with spinning rings, and can dramatically improve sliding characteristics at high speed, and its industrial value is extremely great.

<Example> The present invention will be described in more detail based on the following examples, but the examples show one embodiment of the present invention, and the present invention is not limited thereto.

Preparation method of samples 1 to 18 30 to 35 g of coal tar pitch (carbon yield 45%) was dissolved in 30 g of quinoline, and then ion-exchanged water and polyvinyl alcohol (PVA205 manufactured by Kuraray Co., Ltd.).
0.5% by weight of solid was added and mixed so as to be uniformly dispersed to obtain 600 g of a coal tar pitch dispersion.

To this dispersion was added 300 g of α-type silicon carbide powder having a BET specific surface area of 10 m ² / g (manufactured by Lonza Co., Switzerland) having a silicon carbide content of 97% by weight and 0.4 g of boron carbide passing through a 1200 mesh sieve, and mixed. The particles were spray dried at 180 ° C. to obtain SiC granules having an average particle size of 50 μm.

The granules are molded into a ring shape by a mechanical press at about 1.5 ton / cm ² , and the sintering temperature condition is 200 to 2200.
A silicon carbide ceramic ring material was obtained by changing the temperature in the range of ° C and sintering.

The material thus obtained was processed and polished to produce a spinning ring material (1) having the physical properties shown in Table 1 and adhered to the chest (2) to form the spinning ring (3) shown in FIG. .

The surface roughness is measured according to JIS B 0601-1982.
In accordance with the above, it was performed under the following conditions.

Surface roughness measurement condition: SURFCODER SE-30D cut off 0.8 mm, measuring speed 0.3 mm / sec, measuring magnification 1000 times, measuring length 2.5 mm, sample 19: aluminum oxide for ceramics A uniform slurry was prepared by adding 300 g of powder (AKP-20 manufactured by Sumitomo Chemical Co., Ltd.) to 300 g of ion-exchanged water containing 0.1% of a dispersant (SN-5020 manufactured by San Nopco) at a fixed weight ratio. Obtained.

Polyvinyl alcohol (Kuraray PVA2
Alumina granules with an average particle size of 50 μm were obtained by adding 1.0% of 05) in solid weight ratio and performing a spray dry treatment.

The granules thus obtained were subjected to mechanical press molding as in Samples 1 to 18 and sintered at 1600 ° C. for 2 hours in an air column to obtain an alumina ring material. This material was processed and polished to obtain a spinning ring sample having the physical properties shown in Table 1.

Preparation Method of Sample 20 300 g of partially stabilized zirconia powder for ceramics (HSY-3 manufactured by Daiichi Rare Elements Co., Ltd.) was added to 240 g of ion-exchanged water to which a dispersant was added at 0.2% by solid weight ratio, and mixed. A uniform slurry was obtained. 0.8% by weight of polyvinyl alcohol was added to this slurry and the mixture was spray-dried to obtain zirconia granules having an average particle diameter of 50 μm.

The granules thus obtained were subjected to mechanical press molding in the same manner as in Sample 20 and sintered in air at 1500 ° C. for 2 hours to obtain a zirconia ring material. This ring material was also treated in the same manner as in Samples 1 to 18 to obtain a ring sample for a spinning machine having the physical properties shown in Table 1.

Preparation method of sample 21 Steel material processed into a ring shape for spinning machine was treated with Ticl ₄ , H ₂ ,
A titanium carbonitride layer having a thickness of 15 μm is formed on the surface contacting the traveler by a chemical vapor deposition (CVD) method at 800 ° C. in a gas atmosphere containing CH ₄ and N ₂ as a main component, and a titanium nitride layer having a thickness of 3 μm is further formed on the surface. Multiple layers of layers were formed.

Next, this ring was subjected to quenching treatment and then the surface was polished to form a spinning ring having the physical properties shown in Table 1.

Manufacturing method of sample 22 The same processed steel material as that used for manufacturing sample 21 was sic
A silicon carbide layer having a thickness of 20 μm was formed on the surface in contact with the traveler by the CVD method in a gas atmosphere mainly containing l ₄ and CH ₄ .

Next, this ring was subjected to quenching treatment and then the surface was polished to form a spinning ring having the physical properties shown in Table 1.

Spinning application example Spinning test was performed under the following conditions using the spinning rings of Samples 1 to 22 obtained by the above method, and the highest spindle that does not cause troubles such as abrasion, yarn breakage, and fluff during traveling of the traveler. The number of rotations was measured and compared. The results are shown in Table 1.

Test conditions Ring inner diameter 41mm Flange width 3.2mm Trovera TM MS / hf Spindle speed 15000-24000 rpm Lift 7 inch Fiber cotton comb 40'S The physical properties in the examples were measured by the following methods.

-Measurement method of amount of loose carbon (α) The amount of loose carbon was calculated by CO ₂ conversion by the combustion method at 850 ° C.

-Measurement of sintered density (FD) It was determined by the alkylmedes method.

-Calculation of porosity Porosity (%) = (1-FD x α / 2.22-FD x (1-α) /3.21) x100 α: wt% FD: g / cm ³ -Average pore size and average carbon particles Calculation method of diameter Let areas of pores and carbon particles occupy a polished surface of a certain size be Sp and Sc, respectively.

Further, the number of pores and the number of carbon particles existing on the polished surface are Np and Nc, respectively.

At this time, the average diameter of the pores and the carbon particles is calculated by the following formula.

Average pore size = (6 / π x Sp / Np) Average carbon particle size = (6 / π x Sc / Nc)

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a spinning machine ring used in an example of the present invention, showing (1) spinning machine ring material, (2) body section, and (3) spinning machine ring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Fujii 5-1 Sokai-cho, Niihama-shi, Ehime Sumitomo Chemical Co., Ltd. (56) Reference JP-A-60-2719 (JP, A) -64169 (JP, U)

Claims (1)

[Claims] 1. A surface contacting at least a traveler has a porosity of 0.5% by volume to 15% by volume and an average pore diameter of 0.
A ring for a spinning machine, which is made of silicon carbide ceramics and has pores of 3 μm to 3.0 μm.