JPS5925641B2 - Ceramic thread guiding roller and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic thread guide roller, and more particularly to a ceramic thread guide roller that is lightweight, compact, and capable of high speed rotation, and a method for manufacturing the same.

Conventionally known ceramic thread guiding rollers are mainly made by cutting a thick disc-shaped ceramic material to form a center hole and especially a thread guiding groove on the outer periphery and then firing it. Further, cutting processing has the disadvantage that it is difficult to finish a fragile ceramic base thinly, and it takes a long processing time.

Therefore, a ceramic yarn guide roller 15 that is thin, lightweight, and can be mass-produced with high precision is expected. The present invention aims to eliminate the above-mentioned drawbacks and meet its expectations. The present invention will be described below based on the drawings.

The present invention is a novel ceramic yarn characterized in that a plurality of disc-shaped green sheets having concentric center holes are joined at the center thereof, 20 peripheral edges are expanded at a predetermined angle to form a yarn guide groove, and then fired. The present invention provides a yarn guiding roller and also provides a novel method for manufacturing this yarn guiding roller. The term "green sheet" as used herein refers to a thin plate with a thickness of about to several millimeters, usually made by adding a known binder to a ceramic material such as alumina or tetania.

A plurality of disks are made using this green sheet, and concentric center holes are formed in the disks, usually forming a set of two disks.
The center 30 of this set of disks and the periphery of the center hole 2 are joined except for the peripheral edge 3, and then the peripheral edge is expanded and opened at a certain angle to form a yarn guiding groove 4. Thereafter, it is fired to a predetermined temperature to obtain a ceramic thread guiding roller. Here, the outer diameter of the disk is usually about 20 trtmφ, and the diameter of the 35 thread guide groove is 10
-φ is practical and easy to manufacture, but the size is not limited in the present invention, and even smaller ones can be manufactured according to the present invention.

This disc can be formed from the green sheet alone or as a hair, as can the central hole, and can be formed separately or simultaneously with the central hole. Further, according to the present invention, the disk or the center hole can be formed in a hair state after selectively joining the corresponding central joint portion 5 leaving the corresponding peripheral portion. In this case, it is also possible to form the disk and the center hole simultaneously by punching or the like. This is preferable in order to maintain centering accuracy. A pair of disks having concentric central holes joined together in the center in this manner is joined by bonding with a binder, thermocompression bonding, or a combination thereof. As the binder, for example, a known organic solvent such as butelcarbitol or a diluted solution of a known organic adhesive can be used. When joining by thermocompression bonding, the joint is crimped under heat using a heated plate, and preferably a coating made of heat-resistant synthetic resin, rubber, etc. is inserted between the non-bonded sheets at the peripheral edge of the disc to eliminate unnecessary Prevents undesirable bonding. As this type of heat-resistant material, silicone-based or fluorine-based resins are preferred. The disks joined at the center are then rotatably supported through the shaft through the center hole and opened at a desired angle using a wedge or spatula-like object to form a thread guide groove.

At this time, make a small R (0.3 to 0.5 R) in the center part 6 of the thread guiding groove.
) naturally belongs to the present invention. The opening angle of the peripheral portion may normally be about 15 degrees, but the present invention is not particularly limited to this angle. It is also preferable that the tip edge of the peripheral edge be appropriately rounded. Thereafter, the green sheet disk given the given external shape is fired by a known method.

During firing, in order to maintain the disk-like shape, it is preferable to pass a heat-resistant round rod such as an MO or SiC rod through the center hole and hold and fire it in a furnace. Furthermore, the thread guide roller according to the invention can be manufactured with great precision, so that the centering of the central hole is also very precise.

As a result, it is very easy to install a bearing in the center hole of the yarn guiding roller according to the invention. The attachment can be done with adhesive, and since the centering can be performed accurately, it is possible to manufacture a ceramic thread guiding roller with an extremely low coefficient of dynamic friction suitable for high-speed rotation. As the bearing here, all known shaft friction reduction mechanisms can be used. Examples of the present invention are shown below.

Example 1 A120397%, SiO22%, CaO, MgO each 1
A butyral resin diluted with trichlorethylene was added as a binder to the finely pulverized raw material having a composition of 50% to form a slurry, and a green sheet with a thickness of 1.5 rfrm was produced by the doctor blade method.

A donut-shaped disk with an inner diameter of 6φ and an outer diameter of 26φ is punched out from this green sheet, butelcarbitol is applied to the center side of the joint part with a diameter of 16゛φ, and the green sheet disks are joined with the center hole as a concentric circle and applied to a mini lathe. The bonded disk was set and rotated while thermocompression bonding was applied to the bonded portion. The pressure in this case is number! /CrA~several 10 Kf/Cd and the pressure plate temperature is 100±
Thermocompression bonding was performed at 10° C. for several seconds. Thereafter, a wedge with a rounded tip and an opening of 15 pressure is pushed into the gap at the unjoined peripheral edge of the disc while rotating the disc, until it gradually reaches the end of the joint and reaches a predetermined depth, at the center of the thread guide groove. A thread guide groove was formed by forming a 0.5R in the section and widening the peripheral edge. Then M
It was fired in a hydrogen furnace under a reducing atmosphere while supporting O through the center hole. As a result, thread guiding rollers as shown in FIGS. 1 to 3 were obtained. Example 2 By the same method as in Example 1, a bearing was attached to the center hole of a yarn guiding roller manufactured with a yarn guiding groove diameter of 10φ and bonded with adhesive to obtain a yarn guiding roller as shown in FIG. .

The measurement results of the dynamic friction coefficient are shown in FIG. The yarn used was measured using Tetron 150-30 and Tension 201. As described in detail above, according to the present invention, it is possible to provide a ceramic yarn guide roller that is extremely small and lightweight and has good precision, and also provides a simple manufacturing method. The ceramic yarn guide roller is applicable to natural and synthetic yarns, metal wires or fibers, and other inorganic fibers.

In particular, by installing a bearing, a ceramic yarn guide roller with an extremely low coefficient of dynamic friction is provided, and it has the advantage that it can be advantageously used for high-speed or fine fibers.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of an embodiment of a thread guide roller according to the present invention. 1 is a green sheet substrate, 2 is a center hole, 3 is a peripheral part, 4
5 indicates a thread guide groove, 5 indicates a joint portion, and 6 indicates a center portion of the thread guide groove. FIG. 2 shows a cross section taken along line AA in FIG. FIG. 3 shows a partially enlarged cross-section 1 near the center portion 6 of the thread guiding groove in FIG. 1. FIG. 4 shows an embodiment in which a bearing is arranged in the center hole. r...Bearing. FIG. 5 shows the relationship between the coefficient of dynamic friction and yarn speed in one embodiment of the present invention when a bearing is installed, in comparison with a conventional one.

Claims (1)

[Scope of Claims] 1. A ceramic yarn guide roller made of fired inorganic material, formed by joining a plurality of disc-shaped green sheets having concentric center holes at their centers and expanding their peripheral edges at a predetermined angle. A ceramic thread guiding roller characterized by having thread guiding grooves. 2. Forming a plurality of green sheets into a disc shape, forming a center hole concentric with the disc, and joining the green sheets at the center of the disc, and then forming the disc. A method for manufacturing a ceramic thread guide roller, which comprises expanding the peripheral edge to form a thread guide groove, and firing. 3. The method of manufacturing a ceramic thread guide roller according to claim 2, wherein the green sheet is formed into a disk shape having a concentric center hole and then the center portion of the disk is joined. 4. Claim 2, characterized in that after the green sheet is joined at a desired center of the disk, the green sheet is formed into a disk shape having a center hole forming concentric circles.
A method for manufacturing a ceramic thread guiding roller as described in 2. 5. The method for manufacturing a ceramic thread guide roller according to claim 2, wherein the green sheets are joined by thermocompression bonding, adhesive bonding, or a combination thereof.