JPS6059328B2 - ring for spinning machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring for a spinning machine, which is made of an alloy steel containing at least one type of Al-Cr and subjected to a surface hardening treatment.

Conventional rings for spinning machines are generally made of low carbon steel, and are subjected to carburizing and quenching as a surface hardening process.

However, under the harsh operating conditions of today's spinning mills,
The carburizing and quenching treatment lacks wear resistance against the traveler, resulting in insufficient longevity, and since quenching is performed at high temperatures, heat treatment distortion occurs and the spinning is disturbed. .

In addition, some rings for spinning machines made of nitrided alloy steel are used, but the Fe-N nitrogen compound layer formed on the surface is brittle and easily peels off, so the compound layer falls off in the early stages of use. The traveling surface of the traveler becomes rough and the traveler cannot run smoothly, resulting in a shortened lifespan of the traveler and the ring.

In order to eliminate the drawbacks of the conventional rings for spinning machines, the present invention incorporates at least one nitride-forming alloying element such as A10.2 to 2.0% and Cr 0.2 to 26.0%. The present invention provides a ring for a spinning machine which has high wear resistance and low distortion by subjecting the alloy steel containing the carbon dioxide to soft nitriding or nitriding treatment and forming the surface layer with a nitrogen diffusion layer.

The spinning machine ring of the present invention will be described below based on examples.

Example 1 A10.7-1.2%, Cr1.3-1.7%, M00
．． After cutting a material containing 15 to 0.35% and performing gas nitriding treatment under the following conditions, polishing treatments such as para-polishing and barrel polishing are performed to remove the Fe-N compound layer formed on the outermost surface. Then, the surface layer is formed with a nitrogen diffusion layer to constitute the spinning machine ring of the present invention.

1) Temperature and time Gas nitriding treatment was performed at 525° C. for 6 hours, followed by furnace cooling.

(2) Atmosphere The atmosphere for nitriding is NH.

In a gas atmosphere, the degree of dissociation is preferably 30%. The spinning machine ring of the present invention contains Al and Cr, which are alloying elements that form stable nitrides, as described above, and the brittle compound layer a, which is the outermost layer of the conventional nitride ring, as shown in FIG. After removal, a nitrogen diffusion layer is formed on the outermost surface layer as shown in FIG. 1A.

The compound layer on the ring surface may be removed by polishing at least the traveler running surface of the inner surface of the ring flange.

Further, although nitrided steel containing N-Cr is shown in the examples, it is sufficient to contain one or more of these.

Al is preferably 0.2 to 2.0%; if it is less than 0.2%, the required hardness cannot be obtained, and if it exceeds 2.0%, nitrogen diffusion will be significantly slowed down and embrittlement will be significant. Yes. Cr is 0.2~
26.0% is good; if it is less than 0.2%, the required hardness cannot be obtained, and if it is more than 26.0%, the hardening depth becomes shallow and the necessary wear resistance cannot be obtained. Also, Al-Cr
In addition to at least one type of titanium nitride containing Ti, wear resistance is further improved.

Furthermore, in addition to one or more types of Al-Cr, V-Mn/Si
．． M.O. After performing soft nitriding or nitriding treatment such as gas soft nitriding, gas nitriding, salt bath nitriding, ion nitriding, etc. on alloy steel containing one or more types of Nl, etc., the outermost compound layer is removed. By doing so, the surface layer has Hv85O~130
A ring for a spinning machine having a nitrogen diffusion layer with a significantly high hardness of 0 can be obtained.

Since the spinning machine ring of Example 1 has the above configuration, the second
As shown in the cross-sectional hardness distribution curve in the figure, ring A for spinning machines of the present invention shows a significantly higher hardness distribution than ring C for spinning machines made of conventional low carbon steel carburized and quenched, and almost as hard as conventional nitrided ring B. Maintains constant surface hardness. Fig. 3 shows a comparative diagram of distortion in the ring inner diameter when the ring inner diameter is 45Tm, and the ring A for spinning machines of the present invention has a heat treatment distortion because the nitriding temperature is lower than the conventional carburizing and quenching temperature of 800 to 950°C. becomes significantly smaller.

FIG. 4 is a curve diagram of operating time and wear loss when a practical test was conducted using ring A for a spinning machine according to the present invention, and the test was conducted under the following test conditions.

Test conditions Ring inner diameter: 45mm Flange width: 3.2mm Fiber: Rayon Bright 40''S Spindle rotation speed: 14000r'●p●m From Travelani 0S310 Fig. 4, ring C for spinning machine with conventional carburizing and quenching. In comparison, it can be seen that ring A for spinning machines of the present invention has a wear loss of about 112, and its life is about twice as long.

In addition, compared to the conventional nitrided ring B, the ring A for spinning machines of the present invention has less wear loss in the initial stage of use, and the overall wear loss is about 50% less, and has good initial compatibility with the traveler. It can be seen that a stable traveler running surface is formed in the initial stage of use.

Example 2 C0.34%, All. 24%, Crl. 3%, M.O.O.
．． A ring for a spinning machine according to the present invention is constructed by cutting nitriding steel having a composition of 17% and subjecting it to ion nitriding under the following conditions to form a nitrogen diffusion layer on the surface layer.

In this embodiment as well, the conformability of the ring is improved by performing the polishing treatment after the nitriding treatment. (1) Temperature and time: 500° C. x 4 hours (2) Atmosphere A mixed gas consisting of 5% N2l and 85% H2 was used as the atmosphere, and the pressure was 7T0rr.

Since the spinning machine ring of the present invention is ion-nitrided under the above conditions, a brittle Fe-N compound layer is formed on the surface, and the surface layer forms a nitrogen diffusion layer, resulting in a cross-sectional hardness similar to that of Example 1. A ring for spinning machines with good distribution and structure, good conformability, and good wear resistance can be obtained.

As mentioned above, the ring for a spinning machine of the present invention is AIO. 2-2.
0%, CrO. After performing soft nitriding or nitriding treatment on alloy steel containing at least one type of 2 to 26.0%, the compound layer generated on the steel surface is removed, or nitriding is performed under conditions that do not generate a compound layer. treatment to form a nitrogen diffusion layer on the surface layer, and since there is no brittle Fe-N compound layer on the surface, the traveler fits well from the beginning of use, and the surface hardness is high and wear resistant. This invention has excellent effects such as significantly extending the service life, and furthermore, since the ring is less distorted by heat treatment, the traveling of the traveler is stable and the spinning quality is significantly improved.

[Brief explanation of drawings]

Figure 1 A. B is an enlarged view of the surface of a spinning machine ring and a conventional nitrided ring, each showing an embodiment of the present invention, FIG. 2 is a cross-sectional hardness distribution curve diagram, FIG. 3 is a comparison diagram of the strain amount of the inner diameter of the ring, and FIG. 4 is a ring operating time-wear loss curve diagram.

Claims (1)

[Claims] 1 Alloy steel containing at least one kind of 0.2 to 2.0% Al and 0.2 to 26.0% Cr is subjected to soft nitriding or nitriding treatment, and the surface layer is formed with a nitrogen diffusion layer. A spinning machine ring featuring: