JPH0941230A - Disk for frictional false twisting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject disk good in moving balance and product accuracy by installing a frictional material around a core made from a resin and inserting a shaft for rotation into the hole part of a core metal. SOLUTION: This disk for a frictional false twisting is provided by molding a core made from a resin 12 as one unit around a core metal 11 having a hole part 13 capable of being inserted with a shaft for the rotation of the frictional false twisting device and attaching a frictional material 16 around the core made from the resin by anchoring to the hole part 12c of the core part. An irregular contraction in molding is prevented, a post processing is not required and troubles caused by a distortion is not generated even by working for a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction false twisting disc (hereinafter, also referred to as a friction disc) attached to a rotary shaft of a friction false twisting device.

[0002]

2. Description of the Related Art A friction disc of this type is usually rotatably fitted onto three rotary shafts 2 of a false false twisting device 1 and attached by a fastening metal fitting 3, as shown in FIG. . Then, the yarn 4 is provisionally twisted by being run so as to come into contact with the outer peripheral surface of each friction disk 20 attached to the three rotary shafts 2 with a predetermined pressure.

Upper and lower friction disks 20, 20
Are close to each other with a small gap therebetween, and are required to constantly contact the yarn 4 with a predetermined frictional force, so that high molding accuracy is required. Further, such a friction false twisting device 1
Since many are driven by the belt 5 or the like, it is required to reduce the weight of the friction disc 20.

By the way, the conventional friction disk 2
As shown in FIG. 9, No. 0 is constituted by providing a resin-made friction material 22 around a resin-made core material 21 and has the following problems.

(1) Molding accuracy is poor.

As the core material 21, it is necessary to form a relatively thick core portion 24 having a hole portion 23 for inserting the rotary shaft 2 and an outer peripheral portion 25 for fixing the friction material 22. As described above, since the core material 21 is designed to have an uneven wall thickness due to the shape limitation, the core material 21 is easily deformed due to shrinkage during molding and the dimensional stability is poor.

Further, as described above, since the disk 20 rotates at a high speed, if the accuracy is poor or the wall thickness is uneven, the dynamic balance is poor. In particular, although the core portion 24 is formed with a large set thickness, the hole portion 23 does not become a perfect circle,
Therefore, the linearity of the hole 23 is poor and the dimensional accuracy of fitting the friction false twisting device 1 with the rotating shaft 2 is low.

(2) The deformation is large.

As shown in FIG.
It is used by stacking four stages, and is fixed to the rotary shaft 2 by being clamped by a clamp 3 such as a screw. Therefore, the resin core material 21 is likely to be compressed and deformed, and the height of the disk 20 is slightly deviated, so that the gap between the disks 20 and 20 cannot be controlled and the quality of the false twisted yarn 4 is deteriorated. .
In addition, there is a tendency for troubles such as deviation in accuracy due to creep deformation during long-term use and loosening of fixing.

(3) Problems in post-processing.

In order to correct the processing shrinkage and distortion of the core material 21, it is necessary to machine the core material 21 after molding and re-create its accuracy. Therefore, there are the following problems.

It is necessary to secure the accuracy of the hole 23 and the side surface of the core portion 24 that comes into contact when the disks are stacked, but it is necessary to re-grab the work (disk) once in the processing, and therefore stable accuracy is ensured. Was difficult.

Also, the core portion 24 may be deformed or scratched due to chucking during processing. Further, the core material 21
After the friction material 22 is attached to the outer peripheral portion 25, when the friction material 22 is ground to secure the accuracy and the frictional force of the surface that is responsible for the grip, the chucking is performed in the same manner as above. The core portion 24 will be deformed or damaged.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to improve the dynamic balance of a rotating body and to improve product accuracy. It is to provide a false twist disc. Another object of the present invention is to provide a friction false twisting disk which can reduce defects during processing and can reduce processing cost. Still another object of the present invention is to
It is an object of the present invention to provide a friction false twisting disk that can improve dimensional stability during long-term use.

[0015]

DISCLOSURE OF THE INVENTION A friction false twisting disk of the present invention comprises a core metal having a hole into which a rotary shaft of a friction false twisting device can be inserted, and a resin integrally molded around the core metal. It has a core and a friction material provided around the core, thereby achieving the above object.

Hereinafter, the operation will be described.

Since the rotary shaft is inserted in the hole portion of the core of the disk and a large number of disks are superposed on each other in the core portion, the roundness of the hole portion and the perpendicularity between the hole portion and the end surface of the core are determined. , The parallelism of both end faces of the core requires extremely high precision, and pressure is applied to the core when it is fixed.Therefore, it is necessary to fabricate the core with a material that is resistant to pressure deformation and creep deformation and is lightweight. To be done.

Since no resin material satisfying these conditions has hitherto been found, a cored bar which is the center of the core is formed of a metal such as an aluminum alloy, and the resinous material is insert-molded on this cored bar to form a core. As a result, it is possible to satisfy the above conditions while achieving weight reduction.

It is conceivable to form the core metal and the core portion entirely of metal, but this is disadvantageous in terms of weight reduction and has the following drawbacks.

Molding is difficult because of the complicated shape. The heavy weight makes it difficult to maintain dynamic balance. Adhesion to the friction material such as urethane attached to the outer periphery of the core is low,
It may come off when rotating at high speed. Therefore, it is necessary to perform an adhesive treatment. For each of the above reasons, the cost increases.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Friction false twisting disk 10 of the present invention.
As shown in FIG. 1, a core metal 11 having a hole 13 into which the rotary shaft 2 of the friction false twisting device 1 can be inserted, a resin core 12 integrally molded around the core metal 11, And a friction material 16 provided around the core 12.

The cored bar 11 is made of a relatively lightweight metal such as an aluminum alloy. As shown in FIG. 3, the cored bar 11 is formed in a substantially cylindrical shape having a hole 13 in the center thereof, and a groove portion 15 which is long in the circumferential direction is formed on the outer peripheral portion of the cylindrical body 14. Both end openings of 14 are chamfered.

The cored bar 11 can be manufactured, for example, by chucking a tubular body once and then processing the end surface of the tubular body 14 and the inner surface of the hole 13 in that state. This makes it possible to keep the distance between both end surfaces of the tubular body 14 constant and to ensure the right angle and accuracy between the end surface of the tubular body 14 and the inner surface of the hole 13.

As shown in FIG. 2, the core 12 is formed of a synthetic resin material by integral molding with the core metal 11. For example, PET (polyethylene terephthalate),
PBT (polybutylene terephthalate), PC (polycarbonate), POM (polyacetal), PA (polyamide), PPS (polyphenylene sulfide), and resins in which each resin is reinforced with glass fiber or the like can be used.

The base portion 12a of the core 12 is fitted in the groove portion 15 of the core metal 11 to widen the contact area between the core 12 and the core metal 11 and to roughen the surface of the core metal 11 in the groove portion 15. By doing so, the core 12 rotates integrally with the core metal 11. Further, ring-shaped reinforcing ribs 12b are provided on the front and back surfaces of the core 12 so as to reduce the weight of the core 12 and at the same time provide reinforcement. Further, a large number of holes 12c are formed on the outer peripheral portion of the core 12. The friction material 16 is integrally formed on the outer peripheral portion of the core 12 and is engaged with the hole 12c of the core 12.

As the friction material 16, for example, polyurethane, CR (chloroprene), NBR (nitrile butadiene rubber), H-NBR (hydrogen-substituted nitrile butadiene rubber), polyester elastomer, polyvinyl chloride and the like can be used. .

As shown in FIG. 8, the friction disk 10 thus constructed is rotatably fitted onto the three rotary shafts 2 of the friction false twisting device 1 and attached by the tightening fitting 3. . The yarn 4 is provisionally twisted by being run so as to come into contact with the outer peripheral surface of each friction disc attached to the three rotary shafts 2.

[0028]

EXAMPLES The present invention will be specifically described below based on examples.

(Example) A cylinder is made of an amminium alloy, the cylinder is chucked once, and the end face and the hole of the cylinder are machined together.
Was produced. The distance L ₁₀ between the end faces of the cylindrical body 14 of the core metal
9 mm, outer diameter L ₅ is 21 mm, hole diameter L ₄ is 12 mm
Met.

Next, the core metal 11 was set in a mold, and polybutylene terephthalate was cast to mold the core integrally with the core metal 11 as shown in FIG. The dimensions shown in FIG. 2 were as follows.

L ₁ = 50 mm, L ₂ = 40 mm, L ₃ = 23 mm, L ₄ =
12mm, L ₅ = 21mm, L ₆ = 35mm, L ₇ = 3mm, L ₈ = 2mm, L
_{9 = 7mm, L 10 = 9mm} , L 11 = 1mm.

Next, polyurethane was integrally molded on the outer peripheral portion of the core 12 to form a friction material 16 to obtain a disk 10 as shown in FIG.

Comparative Example A core material was molded from polybutylene terephthalate and then processed to obtain the core material shown in FIG. Next, polyurethane was integrally molded on the outer periphery of the core material to form a friction material, and the disk 20 shown in FIG. 9 was obtained. In the figure, the dimensions of the disk 20 were as follows.

L ₂₁ = 58 mm, L ₂₂ = 38 mm, L ₂₃ = 12 mm, L
₂₄ = 51.4 mm, L ₂₅ = 1.94 mm, L ₂₆ = 9.

Next, the following evaluations were carried out using the obtained disks of Examples and Comparative Examples.

(1) Dimensional accuracy error of core part The errors in the parallelism of the end surface of the core, the squareness of the hole and the end surface, the end surface width, and the undulation of the outer periphery of the disk were measured.

The end face parallelism of the core portion is measured by measuring the distance L between both end faces of the core portion shown in FIG. 4, and the perpendicularity between the hole portion and the end face is shown by the inner surface a of the hole portion shown in FIG. The end face width was measured by measuring the interval L, and the outer peripheral undulation was represented by the maximum width X on the front and back surfaces of the core, as shown in FIG. . The number of measurements n was 20, respectively. Table 1 shows the results.

[0038]

[Table 1]

(2) Table 2 shows the results of the dynamic balance of the disk core.

The number of measurements n was 20.

[0041]

[Table 2]

(3) Cylindricity of Holes As shown in FIG. 6, the diameters of both ends (A, C) and the center (B) of the holes 13, 23 in the axial direction are measured,
The variation was measured. The number of measurements n was 20, respectively. The results are shown in Table 3.

[0043]

[Table 3]

(4) As shown in FIG. 7, four disks were passed through the rotary shaft and tightened with nuts 6, and the amount of deformation H between the upper and lower disks at each torque was measured. The number of measurements n is 1
And The results are shown in Table 4.

[0045]

[Table 4]

[0046]

According to the friction false twisting disk of the present invention,
By providing a metal cored bar in the center of the core, which was the cause of uneven wall thickness, it becomes possible to design products with uniform wall thickness, eliminating distorted molding shrinkage, improving molding accuracy, and post-processing. You no longer need to do. For the same reason, the dynamic balance has improved and balancing is no longer necessary.

Further, since the accuracy of the core hole is improved,
The fitting accuracy with the machine shaft has also been improved, and the amount of unbalance on the machine has been greatly reduced.

Since the compressive deformation of the core metal is so small as to be negligible, the positional relationship of the core is not disturbed even when the screw is strongly tightened when the disk is fixed.

Since the creep deformation of the cored bar was also negligible, there was no problem of screw loosening or troubles due to deformation during use.

Even when polishing is performed after the friction material is provided on the outer peripheral portion of the core, the accuracy of the hole and the end surface is high, and the deformation due to chucking is small, so that the processing accuracy is improved.

[Brief description of drawings]

FIG. 1 is a plan view of a friction false twist disc according to an embodiment of the present invention.

FIG. 2 is a partially cutaway sectional view of a core metal and a core of the disk shown in FIG.

FIG. 3 is a partially cutaway sectional view of a cored bar of the disk shown in FIG.

FIG. 4 is a schematic diagram showing a state in which the end surface parallelism of the core portion of the disk is measured.

FIG. 5 is a schematic view showing a state in which the outer peripheral waviness of the core portion of the disk is measured.

FIG. 6 is a schematic view showing a state of measuring the cylindricity of the hole of the disc.

FIG. 7 is a schematic diagram showing a state in which the amount of overlapping compression deformation of a disk is measured.

FIG. 8 is a perspective view showing a state in which a disc is attached to the friction false twisting device.

FIG. 9 is a sectional view of a conventional friction disc.

[Explanation of symbols]

 1 Friction False Twisting Device 2 Rotating Shaft 3 Tightening Fitting 4 Thread 5 Belt 10 Friction Disc 11 Core Bar 12 Core 13 Hole 14 Cylindrical Body 15 Groove 16 Friction Material

Claims (1)

[Claims] 1. A cored bar having a hole into which a rotary shaft of a friction false twisting device can be inserted, a resin core integrally formed around the cored bar, and a friction material provided around the core. A disk for friction false twist having ,.