JPH0730484B2 - Metal Traveler for Spinning Machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a metal traveler for a spinning machine used in a spinning machine, a twisting machine, and the like.

[Prior art and problems to be solved]

Conventionally, metal travelers for spinning machines are generally made of hard steel wire rods, formed into various shapes such as horizontal type, vertical type, conical type, hardened by quenching and tempering, and subjected to surface treatment such as nickel plating and chrome plating. It is used according to the intended use.

By the way, in the recent spinning industry, which requires severe spinning conditions such as high production and high-speed spinning, and improved operational efficiency,
From the viewpoint of stable operation and economy, it has excellent wear resistance, long life,
Moreover, there is a need for a traveler that has less traveler burnt and less yarn breakage and yarn fluffing.

However, the traveler made of the conventional hard steel wire has insufficient wear resistance and heat resistance during high-speed operation, so that traveler burning occurs, the hardness decreases, and there is a problem in terms of life.

The object of the present invention was made in view of the above-mentioned conventional problems. Under the severe spinning conditions of high production and high-speed spinning, there are few yarn breakages and yarn fluffs, and the toughness, abrasion resistance and heat resistance are low. It is to provide a metal traveler for a spinning machine which is excellent in durability and has a long life.

[Means for Solving the Problems]

To achieve the above object, the metal traveler for a spinning machine of the present invention has C: 0.95 to 1.10% by weight, Cr: 0.20 to 0.50% by weight, V:
0.05 to 0.15 wt% Si: 0.15 to 0.25 wt%, Mn: 0.25 to 0.35
By forming an alloy steel wire rod containing 50% by weight into a predetermined traveler shape, and then subjecting it to quenching and tempering treatment, a martensite structure in which spheroidized Cr and V double carbides are dispersed is formed, and the product hardness is improved. Form Hv650-750.

By the way, among the constituent elements of the metal traveler for spinning machines, C is an element effective in enhancing the quenching and tempering hardness and improving the wear resistance. The higher the carbon content, the more effective it is, but if the content is less than 0.90% by weight, the The effect of wear resistance decreases, and if it exceeds 1.20% by weight, hardenability is decreased and retained austenite is increased, so that uneven hardness and a decrease in hardness are apt to occur, which is harmful.
The optimum range is from 1.10% by weight.

Further, Cr is a carbide forming element and is an element effective for improving wear resistance and heat resistance. If this Cr content is less than 0.20% by weight, there is no effect, and if it exceeds 1.60% by weight, heat resistance is improved, but not only plastic workability and toughness are significantly reduced, but also the toughness required as a traveler is imparted. Therefore, a high temperature tempering process is required, and therefore the hardness of the traveler base is greatly reduced, and the desired abrasion resistance cannot be improved, which is not preferable. The optimum Cr content is 0.20 to 0.50% by weight.

Next, V is a carbide-forming element similar to Cr, which is an element effective in improving wear resistance and heat resistance and is also effective in improving toughness, but when the V content is less than 0.05% by weight, it has no effect. , 0.
If it exceeds 50% by weight, heat resistance is improved, but plastic workability and toughness are deteriorated, which is not preferable. The above V is optimally 0.05 to 0.15% by weight.

Furthermore, Si is added for the purpose of deoxidizing, and Mn
Is an element effective for improving hardenability for the purpose of deoxidizing and desulfurizing. The content of Si and Mn is preferably 0.35% by weight or less, optimally 0.15 to 0.25% by weight for Si and 0.25 to 0.35% by weight for Mn.

〔Example〕

An embodiment of the metal traveler for a spinning machine of the present invention will be described below with reference to the drawings.

C: 0.99% by weight, Cr: 0.26% by weight, V: 0.09% by weight, Si: 0.21
%, Mn: 0.30% by weight, the balance being Fe and the alloy steel wire rod containing impurities normally contained (P, S, Cu, Ni, etc.) as a material, a traveler shape of a predetermined shape, for example, a horizontal traveler (1) ( Fig. 1 (a)), conical traveler (2)
(Figure (b)), vertical traveler (3) (Figure (c)), etc., and after quenching (quenching temperature 830 to 880 ° C), tempering (tempering temperature 250 to 350 ° C) Forms a martensite structure in which spheroidized double carbides of Cr and V are dispersed, and
The desired spinning metal traveler having a hardness of Hv 650-750 was formed.

The following test was performed using the product A of the present invention according to the above-mentioned examples and the conventional products B and C of the travelers for comparison tests.

Conventional product B is made of C: 1.0 wt% carbon steel wire without Cr, V, and conventional product C is C: 1.0 wt%, Cr: 0.50
A weight% alloy steel wire rod was used as a raw material, and was formed into the same traveler shape as the product A of the present invention, and then heat treated.

(Test Conditions) yarn: Cotton combed yarn 40 ^'s ring: 3.2MmF, inner diameter 45mmφ traveler: YS-2 / hf 9/0 spindle speed: 18,000 rpm Test Time: 50 hr the spun after the test, and the present invention product A When comparing the wear reductions of the conventional products B and C, the product of the present invention was 2.5 mg, whereas the conventional products B and C were 5.0 mg and 3.5 mg, respectively, and the product A of the present invention was Compared with C, the weight loss was reduced by 50% and 30%, respectively, and a significant improvement in life was observed (see Fig. 2).

The change in hardness before and after the test was obtained as shown in FIG. As is clear from FIG. 3, the decrease in hardness before and after the test was Hv50 for the product A of the present invention, whereas it was Hv200, Hv150 for the conventional products B and C.
Compared with the conventional products B and C, the hardness reduction range is Hv15.
It was proved to be excellent in plastic deformation resistance and thermal softening resistance, with less 0, Hv100. That is, the product of the present invention improves the plastic deformation resistance and the thermal softening resistance in the martensite structure in which the spheroidized double carbides of Cr and V are dispersed, and contributes to the improvement of the wear resistance.

In addition, Figure 4 shows high-speed spinning (for example, spindle speed
17,000 to 20,000 rpm), the relationship between the friction heat temperature of the traveler and the product hardness caused by the friction between the ring and the traveler,
4 shows the test results of the product A of the present invention and the products B and C of the present invention, which were performed by using a heating temperature (soaking at a constant temperature) instead of the friction heat temperature. As is clear from this figure, it was found that the product of the present invention was superior in heat softening resistance to the conventional product.

By the way, in general, a member having higher plastic deformation resistance and thermal softening resistance tends to have lower toughness, and the same applies to travelers.

In the case of a traveler, if the desired toughness is not obtained, it tends to break during use, and conversely, if the rigidity is insufficient, it tends to stretch and scatter.
Will be defective. Fig. 5 shows the correlation between the high temperature hardness (substitute characteristic of thermal softening resistance) and the toughness of travelers with different Cr and V contents. That is, FIG. 5 shows that C: 1.0 wt%, Cr
The V and V contents are as shown in the table below. For the six types of horizontal travelers described above, the hardness of the product and the opening allowance processed under the same processing conditions (when the opening C of the horizontal traveler (1) in Fig. 1 (a) is expanded, the traveler does not fold or return) 2 is a graph comparing the correlation of the opening margin of, ie, the toughness substitute value of the traveler).

In the figure, the opening margin of 3 mm or less is likely to be broken, and the opening margin of 7 mm or more is likely to be stretched and scattered. However, the lower and upper limits of this range differ somewhat depending on the type and shape of the traveler.

As is clear from FIG. 5, the metal traveler for spinning machine of the present invention (Samples 5 and 6) has desired high temperature hardness and toughness,
It was found that the wear resistance was greatly improved.

〔The invention's effect〕

The metal traveler for a spinning machine according to the present invention has high temperature hardness and toughness, has significantly improved wear resistance, and is capable of high production, stable operation at high speed spinning, and relatively low cost. It has an effect.

[Brief description of drawings]

1 (a), (b), and (c) are front views of the metal traveler for a spinning machine of the present invention, and FIG. 2 is a graph showing a comparison of the average wear reduction of the product A of the present invention and the conventional products B and C. Fig. 3 is a graph showing a comparison in hardness decrease between the product of the present invention and the conventional product before and after the test, Fig. 4 is a comparison diagram of heating temperature and hardness of the product of the present invention and the conventional product, and Fig. 5 is Cr. FIG. 5 is a comparative relationship diagram of the opening margin and hardness of travelers having different V contents.

Claims (1)

[Claims] 1. C: 0.95 to 1.10% by weight, Cr: 0.20 to 0.50% by weight, V: 0.05 to 0.15% by weight, Si: 0.15 to 0.25% by weight, Mn: 0.
By forming an alloy steel wire rod containing 25 to 0.35 wt% into a predetermined traveler shape, and subjecting it to quenching and tempering,
A metal traveler for a spinning machine, which has a martensite structure in which spheroidized double carbides of Cr and V are dispersed and has a product hardness of Hv 650 to 750.