JPS62116722A - Traveller for spinning machine - Google Patents

Abstract

PURPOSE:To produce a traveller for a spinning machine which satisfactorily withstands high-speed rotation by subjecting an extra-low carbon high-nickel steel to a soln. heat treatment then forming the traveller and subjecting the traveller to an aging treatment. CONSTITUTION:The extra-low carbon high-nickel steel (maraging steel) is held for about 1hr at about 800-850 deg.C and is then quickly cooled (soln. heat treatment). The steel is drawn and molded to the shape of the traveller and is then heated up to about 450-520 deg.C. The traveller is held at said temp. for about 1hr and is thus aged. The traveller having about 50 HRC hardness is thus obtd. and the traveller for the spinning machine having about 300hr life even under the high speed rotation of about >=20,000rpm spindle speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a traveler for a spinning machine used in a ring spinning machine, a ring twisting machine, etc.

(Prior Art) In recent years, speeding up of spinning machines such as ring spinning machines and ring twisting machines has been sought to improve productivity. and,
Traveler wear becomes an important issue as speed increases.

Conventionally, carbon tool steel (LJIS G-4401SK material) is commonly used as a material for a traveler for a spinning machine. There is not much of a problem when the spindle rotation of the spinning machine is relatively slow, but if the spindle rotation speed is 2000
If the Orpm is exceeded, problems such as wear will occur,
I've become unable to cope.

As shown in FIG. 6, winding tension W1 of yarn Y, balloon tension T, and centrifugal force C are applied to spinning machine traveler 1 during winding operation, and the resultant force acts as contact pressure with ring 2. do. Further, the sliding speed between the traveler 1 and the ring 2 is determined by the rotation speed of the spindle and the ring diameter. Frictional heat is generated between the ring and the traveler due to this contact pressure and sliding speed.

And conventional carbon tools! In the case of a traveler made of M (SK material), due to the frictional heat between the ring and the traveler, the traveler temperature rises as the spindle rotation speed increases, as shown in Figure 5, and the spindle rotation speed reaches 2000 O.
When the rpm exceeds 400°C, the temperature reaches 600°C when the spindle rotation speed is 2500 rpm. Further, the hardness of the carbon tool WA (SKI) decreases as the temperature rises, and when the temperature exceeds 300°C, the hardness decreases rapidly, and at 6°0°C, the hardness becomes less than Rockwell hardness HR040.

(Problem to be solved by the invention) In general, wear due to sliding friction occurs when the hardness of the steel material is HRC40.
It progresses rapidly below. In the conventional traveler, the rotational speed of the spindle was adjusted under the current operating conditions (120
00-18000rpm) which is much faster than 2000rpm
When used at 0 to 2500 Orpm, the temperature of the traveler reaches as high as 600°C, its hardness becomes HRC40 or less, and wear rapidly progresses. In addition, in conventional travelers made of SK material, an oxide film is easily formed and peeled off easily, so that wear progresses rapidly due to repeated formation and peeling of the oxide film, especially at high temperatures. Therefore, the spindle rotation speed is 2500
When it comes to Orpm, there is a problem that the useful life of the traveler is only a few hours at most, and it cannot be used regularly.

Therefore, when the spindle rotates at a high speed of 20,000 rpm or more, there is a desire for a traveler in which the hardness of the traveler does not decrease even when the temperature rises.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, this invention uses ultra-low carbon high nickel steel (Maraging! Form into the shape of the rear traveler,
Thereafter, by post-processing such as aging, a traveler for a spinning machine that can sufficiently withstand high-speed rotation was obtained.

In addition, a traveler that can sufficiently withstand high-speed rotation was obtained in the same manner as described above, using maraging stainless steel made of ultra-low carbon high nickel steel containing chromium as the material.

(Function) During the spinning operation, the traveler 1 slides on the ring 2, and frictional heat is generated between the traveler 1 and the ring 2. When the spindle rotates at high speed, for example at 25,000 rpm, the temperature of the traveler 1 may reach 600°C due to frictional heat with the ring 2. However, when using the traveler of the present invention, the temperature of the traveler reaches 600°C. However, the hardness is maintained at t-IRC40 or higher (Fig. 2). In addition, as shown in Figure 4, maraging steel (Material B) has significantly superior oxidation resistance at high temperatures compared to 5KD61, which has better oxidation resistance than the conventional traveler material SKI. Abrasion due to repeated formation and peeling of oxide film is extremely low.

Therefore, even when the spindle rotates at a high speed of 25,000 rpm and the temperature of the traveler becomes high, unlike conventional products, there is no sudden increase in wear and the product can be used satisfactorily.

Maraging steel has a martensitic structure with a Rockwell hardness of around HRC30 through solution treatment, and in that state it has excellent cold workability and can be easily formed into a traveler shape. Then, the hardness can be increased to HRC40 or higher by aging treatment. As shown in FIG. 3, the hardness after aging reaches its maximum when the aging temperature is 450°C to 520°C, and the hardness decreases when aging is performed at lower or higher temperatures. After the traveler is aged at the optimum age hardening temperature, it is maintained at a higher temperature during high speed rotation of the spindle (2500 rpm), resulting in overaging. but,
As shown in FIG. 3, the hardness of maraging steel is maintained at around RC45 even after overaging.

(Example 1) Nickel content 18% by weight, cobalt content 7-8.5
% by weight, molybdenum content 5% by weight, titanium content 0.
3-0.5% by weight, aluminum content 0.05-0.
After holding the maraging steel (material A) with a composition of 15% by weight and the balance iron at 800-850°C for 1 hour,
It was rapidly cooled (solution treatment). Next, material A was expanded and contracted into a predetermined cross-sectional shape of a traveler, and after being further molded into the shape of a traveler, it was heated to 450 to 520°C and kept at that humidity for 1 hour to perform an aging treatment. Hardness after aging treatment is HR050
It was before and after.

FIG. 1 shows the results of a test using the traveler formed as described above and a conventional traveler made of SK5 material at various spindle rotational speeds. With conventional travelers, when the spindle rotation speed exceeds 15,000rl)m, the lifespan rapidly shortens.
In the case of 500 Orpm, the service life is only a few hours at most.
It cannot be used regularly. However, the traveler according to the invention has a spindle rotation speed of 25000 rpm.
It has a lifespan of about 300 hours even when rotating at high speed.
It can be used for regular use.

(Example 2) Nickel content 18% by weight, cobalt content 9% by weight,
Molybdenum content 5% by weight, titanium content 0.6% by weight
, a maraging steel (material B) with an aluminum content of 0.1% by weight and a balance of iron composition of 800-850%
After being held at ℃ for 1 hour, it was rapidly cooled (solid solution treatment). Next, the material 8 was drawn into a predetermined cross-sectional shape of a traveler, and after being roughly formed into the shape of a traveler, it was heated to 450 to 520°C and maintained at that temperature for 1 hour to perform an aging treatment. The hardness after the treatment was around HRC56.

The traveler made of this material B also has almost the same wear resistance as the traveler made of material A in the above example, and has a service life of about 300 hours even when the spindle rotates at a high speed of 25,000 rpm, which is sufficient for regular use. It can be provided to

It should be noted that the present invention is not limited to the above embodiments, and instead of maraging steel, maraging stainless steel, which is an extremely low carbon high nickel steel containing chromium, may be used as the material of the traveler. As a maraging stainless steel, the content of component elements (mold assembly %) is 4% nickel, 13% chromium, 12% cobalt, and 5% molybdenum.
%, the remaining is mostly iron, and the material has a composition with aluminum and titanium differentials, and is subjected to solid solution treatment at 950°C and rapidly cooled to air temperature. The material thus obtained is drawn, then formed into a traveler shape, and aged at 520 to 530° for 4 hours. In this way, 1-IRc becomes 45-50.

In addition, as a post-treatment after solution treatment, after performing aging treatment, the traveler surface is further hardened by performing nickel plating, chromium plating, soft nitriding treatment, or nitriding treatment as surface treatment, and the It is possible to extend the service life of Alternatively, the aged material may be used, or the material may be subjected to the above-mentioned surface treatment and then subjected to molybdenum disulfide treatment. When molybdenum disulfide treatment is applied, the frictional resistance between the traveler and the ring becomes smaller, making it possible to significantly extend the life of the traveler.

Effects of the Invention As detailed above, according to the present invention, even when the spindle rotates at a high speed of 25,000 rf), the hardness of the traveler is maintained at HRC40 or higher, and since it is difficult to oxidize, wear is reduced, and it can be used for a long time. It has an excellent effect of being able to withstand use.

[Brief explanation of drawings]

Figure 1 is a diagram showing the relationship between spindle rotation speed and traveler life, Figure 2 is a diagram showing the relationship between traveler material temperature and hardness, and Figure 3 is a diagram showing the relationship between aging temperature and hardness of maraging steel. A diagram showing the relationship, Figure 4 is a diagram showing the oxidation resistance test results of the material, and Figure 5 shows the relationship between the spindle rotation speed and the temperature and hardness of the traveler when using a traveler made of carbon tool steel (SK material). FIG. 6 is a sectional view of a main part showing the force applied to the traveler during winding operation. Traveler 1, Ring 2゜Patent Applicant: Toyoda Automatic Loom Works Co., Ltd. Manager: Patent Attorney On 1) Hironobu Figure 1 Spindle rotation speed (x1♂rpm) Figure 3 Aging temperature (°C) 9 hours Figure 4 Heating Time (hr) Figure 5

Claims (1)

[Claims] 1. A traveler for a spinning machine, which is made of ultra-low carbon high nickel steel (maraging steel) and is subjected to solution treatment and post-treatment. 2. The traveler for a spinning machine according to claim 1, wherein the post-treatment is an aging treatment. 3. The traveler for a spinning machine according to claim 1, wherein the post-treatment is an aging treatment followed by a surface treatment. 4. The traveler for a spinning machine according to claim 3, wherein the surface treatment is plating treatment. 5. The traveler for a spinning machine according to claim 3, wherein the surface treatment is soft nitriding or nitriding treatment. 6. The traveler for a spinning machine according to claim 1, wherein the post-treatment is an aging treatment followed by a surface treatment and a molybdenum disulfide treatment. 7. A traveler for a spinning machine, which is made of maraging stainless steel made by adding chromium to ultra-low carbon high nickel steel, and is characterized by being subjected to solution treatment and post-treatment. 8. The traveler for a spinning machine according to claim 7, wherein the post-treatment is an aging treatment. 9. The traveler for a spinning machine according to claim 7, wherein the post-treatment is an aging treatment followed by a surface treatment. 10. The traveler for a spinning machine according to claim 7, wherein the post-treatment is an aging treatment followed by a surface treatment and a molybdenum disulfide treatment.