JPH059818A - Metallic traveler for spinning frame - Google Patents

Abstract

PURPOSE:To obtain the subject traveler having high abrasion resistance and durability and free from generation of fluffs by forming a prescribed traveler circle with a high-speed steel wire made of a specific matrix metal and applying a plated layer of carbon-containing chromium on the circle at a yarnpassing part contacting with yarn. CONSTITUTION:A prescribed traveler circle 1 is formed from a high-speed steel wire 2 made of a matrix metal containing 0.7-0.9% C, 3.5-4.5% Cr, 10-22% W and 0.8-2.3% V. A chromium plated layer 4 containing 2-4% carbon 3 is formed on at least the yarn-contacting part of the yarn-path of the circle 1 and successively heat-treated in a non-oxidizing atmosphere at 600 deg.C for 1hr to obtain the objective metallic traveler for spinning frame having a hardness Hv of the matrix metal of >=700, that of the plated layer of >=1,500, remarkably improved abrasion resistance of the yarn-passing part to eliminate the abrasion troubles with yarn, enabling long stable continuous operation and having long life.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal traveler for a spinning machine, which has improved wear resistance and durability of a yarn passing portion of a traveler used in a spinning machine, a twisting machine and the like.

[0002]

2. Description of the Related Art Conventionally, in metal travelers for spinning machines,
Abrasion resistance of the yarn passing portion is required under operating conditions in which the yarn passes through the yarn passing portion at a high speed or under operating conditions in which the yarn contains a special additive. Therefore, in order to improve this wear resistance,
A chrome-plated or satin chrome-plated traveler is used as a hardening treatment on the surface of the thread passing portion.

However, the hardness of conventional chrome plating and satin chrome plating is about Hv 1000 to 1200, and due to the speeding up of operating conditions and the specialization of the spun yarn, the conventional traveler will experience early wear of the yarn passing portion. However, there is a problem in that the yarn quality is deteriorated, the yarn is fluffed or broken, and stable spinning cannot be obtained, the life is shortened, and the trouble of exchanging the traveler is increased.

Further, similar to the above, the friction at the contact portion with the ring becomes severe, and accordingly, the base material is required to have higher wear resistance.

[0005]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present invention responds to speeding up of operating conditions and specialization of spun yarns, and wear resistance of the yarn passage portion of a metal traveler. And the wear resistance of the base metal is also improved.

[0006]

In the metal traveler for a spinning machine of the present invention, the base metal is C: 0.7 to 0.9%, Cr: 3.5 to 4.
5%, W: 10-22%, V: 0.8-2.3%, and the like, a predetermined traveler circle is formed using a high-speed steel wire rod, and at least in the yarn passing portion that comes into contact with the yarn, 2 to 2 carbons
By providing a chromium plating layer containing 4%, heat treatment is performed to obtain a metal traveler for a spinning machine in which the hardness of the base metal is Hv 700 or more and the hardness of the chromium plating layer is Hv 1500 or more.

[0007]

EXAMPLES An example of the present invention will be described in detail below.

FIG. 1 is a partially cutaway front view of a metal traveler for a spinning machine showing an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view of the same. As shown in the figure, a high-speed steel wire rod is used to form a vertical traveler or a horizontal traveler formed into a required circle shape 1.

The above traveler was oil-quenched at 1290 ° C., then polished, and then chromium-plated under the following chromic acid-oxalic acid bath (oxalic acid bath) and electrodeposition conditions. As shown, a chromium plating layer 4 containing a carbon compound 3 having a thickness of 30 μm on the surface of the high speed steel base material 2
To form.

The chromium-plated traveler was subsequently subjected to heat treatment at 600 ° C. for 1 hour in a non-oxidizing atmosphere to form the metal traveler for a spinning machine of the present invention.

Plating conditions Bath composition Chromic acid 200 g / l Oxalic acid 640 g / l Ammonium sulfate 75 g / l Electrodeposition conditions Current density 20 A / dm ² Bath temperature 60 ° C. PH 2

When chrome plating is performed with the above bath composition, the hardness after plating is about Hv1000 to 1200, which is not different from the conventional chrome plating (surgent bath). However, by subjecting this to a heat treatment at 500 to 650 ° C., carbon in the plating layer can obtain a plating hardness of Hv1500 or higher due to the formation of chromium carbide, but in the conventional chromium plating using the Sargent bath, Hv60
Softens to 0 or less.

When chromium plating is applied to an ordinary hard steel wire with the above-mentioned oxalic acid bath composition, the hardness of the plating layer becomes Hv 1500 or more by heat treatment at 500 to 650 ° C., but the hardness of the base metal is opposite. It is softened to Hv 500 or less, and the wear resistance of the base material is significantly deteriorated. On the other hand, in the present invention, the hardness of the base material is ensured by utilizing the secondary hardening by quenching the high speed steel and then performing the heat treatment at 600 ° C.

The content ratio of carbon contained in the chromium plating layer of the metal traveler obtained in the above example is 3.5%, the hardness of the plating layer after heat treatment is Hv1850, and the hardness of the base metal is Hv8.
It was 30.

The content of carbon contained in the chromium plating layer is preferably in the range of 2 to 4%, and if it is less than 2%, the desired hardness cannot be obtained even if heat treatment is performed, and
If it exceeds 4%, the plating layer becomes brittle, which is not preferable.

The metal traveler for a spinning machine (A) of the present invention obtained in the above example, the metal traveler for a spinning machine (B) subjected to the conventional Sargent bath hard chrome plating treatment, and the conventional hard steel wire rod. Using the metal traveler (C) as a comparative example, which was subjected to oxalic acid bath chromium plating according to the present invention and heat-treated at 600 ° C., a spinning test was carried out under the spinning conditions shown below.

Spinning conditions Thread: Polyester filament 40 denier ring: Vertical sintered ring STSn 140 mmφ Traveler: Vertical SSB No. 33 Spindle speed: 10000 r.p.m.

As a result of the above spinning test, in the conventional metal traveler (B) for spinning machine, the yarn passing portion was worn in 2 to 3 hours, white powder was generated and yarn fluffs increased, and the fiber was flawed and spinning was difficult. In contrast, the metal traveler for spinning machine (A) of the present invention is 2
Even after 0 hours of operation, no wear occurred, and the contact area with the ring had worn plating, but the base material had a high hardness, and there was little wear and it had excellent wear resistance. confirmed.

In Comparative Example (C), wear of the yarn passing portion did not occur even after 20 hours of operation, but since the base material hardness at the contact portion with the ring was low, there was much wear and scattering of the traveler occurred.

[0020]

Since the product of the present invention has the above-mentioned structure, the hardness of the chromium plating layer can be as high as Hv 1500 or more, and the base material hardness can be also as high as Hv 700 or more, and the abrasion resistance of the thread passing portion can be improved. Remarkably improved, wear due to yarn is eliminated, and no fluff or white powder is generated. Also, the wear resistance with the ring is improved. Therefore, the invention has an excellent effect that damage to the yarn is eliminated, stable continuous operation can be performed for a long time, and the life of the traveler can be extended.

[Brief description of drawings]

FIG. 1 is a front view of a metal traveler for a spinning machine of the present invention.

FIG. 2 is a partially enlarged sectional structure diagram of the metal traveler for a spinning machine of the present invention.

[Explanation of symbols]

 1 Circle shape 2 High speed steel base material 3 Carbon compound 4 Chromium plating layer

Claims (1)

Claims: 1. The base metal is C: 0.7 to 0.9%, Cr: 3.
A predetermined traveler circle is formed by using a high-speed steel wire rod containing 5 to 4.5%, W: 10 to 22%, and V: 0.8 to 2.3%, and comes into contact with at least the thread of the circle. A chrome plating layer containing 2 to 4% of carbon is provided in the thread passing portion, the hardness of the base metal is Hv 700 or more, and the hardness of the chrome plating layer is Hv 1500 or more. Metal traveler for spinning machines.