JPH03199433A - Ring for spinning frame - Google Patents

Abstract

PURPOSE:To obtain the subject ring enabling continuous operation owing to excellent abrasion resistance at high rotational speed and suitable for high-speed fine spinning by covering a sliding face of a traveler with a surface layer having spheroidized carbon protruded on the surface and forming a specific alloy plating layer on the surface of the surface layer. CONSTITUTION:An alloy steel containing 0.9-26% of chromium is formed in a ring-form and subjected to cementation and hardening to coat at least the sliding face of a traveler with a surface layer having a carbon content of 1.5-5% and containing spheroidized carbide 2 protruded on the surface. The surface layer is coated successively with layers having successively decreasing carbon contents and finally a nickel-phosphorus alloy plating layer 3 having a coating film hardness of Hv800-1100 is formed on the top of the surface layer to obtain the objective ring. The protrusions of the carbide can be formed e.g. by immersing the cemented and hardened ring in hydrochloric acid having a concentration of 20% to corrode the iron matrix 1 on the surface layer part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ring for a spinning machine that exhibits excellent performance in high-speed spinning.

[Prior Art and Problems to be Solved by the Invention] Conventional rings for spinning machines are generally made of low carbon steel, and are subjected to carburizing and quenching as a surface hardening process. but,
In the above ring, the spindle rotation speed is 20.000 r
, p, m or more (current high speed rotation is 17,000 r,
p, m, -18,000r, p, m,), due to the increase in frictional resistance between the ring and the traveler and the rapid rise in frictional heat, the traveler seizes up early and scatters, making continuous operation impossible. was there.

For this reason, alloy steels containing chromium are subjected to quenching or carburizing, but this has not yet solved the above problems.

The object of the present invention is to solve the above-mentioned problems and provide a ring for a spinning machine that has improved wear resistance during high-speed rotation and is capable of continuous operation.

[Means to solve the problem]

The present invention uses alloy steel containing 0.9 to 26% chromium to form a predetermined ring shape, and at least the sliding surface of the traveler has a carbon content of 1.5 to 5% by carburizing and quenching.
A protruding surface layer of spheroidal carbide is provided on the surface, a layer in which the amount of carbon decreases sequentially is formed following the surface layer, and a nickel-phosphorus alloy coating layer having a coating hardness of Hv800 to 1100 is further formed on the surface of the surface layer. The present invention provides a ring for a spinning machine, in which the amount of spheroidized carbide on the surface layer of the ring for a spinning machine is 30 to 90% in terms of area ratio, or the center line average roughness Ra of the traveler sliding surface is 0.25. ．． m or less, or the thickness of the nickel-phosphorus alloy coating layer is 2 to 1
The present invention provides a spinning machine ring of Q4.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

High carbon chromium bearing w4 containing Cr: 1.5%, C: 1%
After cutting (SUJ-2) and forming it into a predetermined ring shape, gas carburization was performed at 8800 cx for 15 hours, and 850°
After quenching in oil at temperature C, subzero treatment is performed at -50°C, and then tempering is performed at 200'C for 3 hours. Next, the surface layer of the iron substrate is eroded by immersion in 20% hydrochloric acid to cause carbon and compounds (2) to protrude from the surface of the iron substrate (1) as shown in Figure 1, and then nickel and phosphorus are added. Alloy coating is performed, and the surface is coated with a nickel-phosphorus alloy plating layer (3
) to form.

Next, the ring is heat-treated at about 400° C. for about 1 hour in a heat-treating furnace to form a spinning machine ring having a surface coating hardness of 800 to 1100 Hv.

More preferably, the flange surface on which the traveler contacts and slides is polished to form a ring for a spinning machine that has a smooth surface with a center line average roughness of 0.257 J or less and has carbide and nickel-phosphorus alloy plating coexisting. 3. In the above embodiment, the thickness of the nickel-phosphorus alloy coating layer (3) is preferably 2 to IO/R1.

Note that, instead of the above-mentioned sub-zero treatment, secondary hardening may be performed at 840°C. In addition, the carburizing temperature is 930°C
The temperature below is desirable. If the temperature is higher than 930°C, the base material will become coarse and large lumpy carbides will precipitate along the grain boundaries, causing cracks to occur while the traveler is running, making it easy to wear.

As shown in FIG. 2, the ring for spinning machines of the present invention has a carbon content of 1.5 to 5°6 in the surface layer of at least 0.05 mm, and the carbon content decreases successively from the surface layer.

In addition, the surface structure is a maltefuzite structure in which spherical carbides are dispersed.

Furthermore, the amount of dispersed carbide is 0.05 m below the surface layer.
The area ratio of carbides in the area up to m2 should be 30 to 90%, preferably about 40 to 70%.If the amount is too low, the wear resistance effect will be small, and if the amount is too high, the toughness will deteriorate, resulting in peeling and cracking. It is easy to cause this.

In addition, the carbon content of the surface layer up to about 0.05 mm is 1
．． A suitable range is 5 to 5%, preferably 2 to 4%. Note that if it is less than 1.5%, the amount of carbide is small and the effects on wear resistance and fatigue resistance are small. Moreover, if the carbon content is high, carbide precipitation will be too large, resulting in poor toughness.

Further, the Cr content of the material is preferably 0.9 to 26%, and 0.9% to 26%.
If it is less than 9%, it is difficult for the carbide to become spheroidized and precipitate in a network shape, resulting in poor wear resistance and fatigue resistance. If it is more than 26%, carburizing takes time and the material cost becomes expensive.

As a method for protruding the carbide, a chemical method such as that used in the embodiments of the present invention is effective, or a mechanical method such as John deblasting may be used.

The thickness of the alloy plating layer was set to 5 to 10 μm, but if it is smaller than 5 μm, the effect of the alloy plating will not be fully exhibited, causing early wear and seizure of the traveler, and the thickness will be 10/10 μm.
If it exceeds Jl, it will cause surface roughness and peeling of the coating.

Furthermore, when the surface roughness of the traveler contacting part of the ring for a spinning machine of the present invention is polished to a center line average roughness Ra of 0.25 un or less, the wear of the traveler is reduced as shown in Fig. 3, even under high-speed conditions. The life of the traveler is long and stable spinning can be maintained for a long time.

The conditions for measuring the center line average roughness are as follows: using a stylus with tip R = 2/@, cant-off value λc - 0.25 mm, measurement length L = 0.8 mm, drive speed 0.1 mm/
It is designated as S.

Next, the spinning machine ring (4) of the present invention and the conventional spinning machine ring (B) obtained by carburizing and quenching alloy steel containing chromium.
A comparative test was conducted using the following conditions:

Thread: Ester/cotton 45'S Ring: 3.2mmF 41mmuX57.5
mm$mm spatula: ys-2/hrl110 Nikkermenki product) Spindle rotation speed: 16,000r,
p, m - 30,00 Or, p, m Figure 4 shows the frictional resistance index of the traveler and ring at each spindle rotation speed under the above spinning conditions.

Spindle rotation is 16.000r, p, m -18.

000 r, p, and m, there is no significant difference between the ring of the present invention (4) and the conventional ring (I3), and no significant increase in the frictional resistance index is observed.

When the spindle rotation speed exceeds l 8.00 Or, p, m, the frictional resistance index of the conventional ring [F]) begins to rise, but the ring (4) of the present invention does so gradually. 2 more
At 0.000 r, p, m or more, the frictional resistance index of the conventional ring begins to rise rapidly. OQ Q r,p
, m or more, seizure and wear of the traveler progress, making continuous spinning impossible.

On the other hand, the ring (4) of the present invention has a spindle rotation speed of 24.000 r, p, m and 30.000 r, p, m.
No sudden increase was observed even in the high speed range of
There is almost no wear on the traveler even at 0,000 r/pm.
Continuous spinning became possible.

〔Effect of the invention〕

As described above, the present invention forms a coexistence of carbide and nickel-phosphorus alloy plating, and also increases the hardness of the alloy plating by Hv.
80 (1 to 1100, and further the surface roughness is R・0.
Since it is formed to be less than 25, the spindle rotation speed is 2.
It has good adaptability even at ultra-high speeds of 4.00 Or, p, m or higher, enables stable continuous operation, prevents traveler burn, and extends the life of the traveler.

Furthermore, by polishing, hard particles are exposed on the surface that contacts the traveler, which improves the wear resistance of the ring and extends its lifespan.

Furthermore, since heat treatment is performed after plating, this invention has excellent effects such as no peeling of the plating layer.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part of a ring for a spinning machine according to an embodiment of the present invention on the sliding surface with a traveler, Fig. 2 is a curve diagram showing the relationship between depth from the ring surface and carbon concentration, Fig. 3 4 is a curve diagram showing the relationship between traveler wear amount and surface roughness, and FIG. 4 is a curve diagram showing the relationship between spindle rotation speed and frictional resistance index. (1)・・・Iron base (2)・・・・・・
・Carbide (3)・・・Ninkel-phosphorus alloy coating layer 1 Figure 0, J O, 20, 30, 40, 50, 6 surface areas; Figure O3l z 3 Medium+15' average group -v (Rαμ added) Figure spindle (r.p,...]

Claims (4)

[Claims] (1) A predetermined ring shape is formed using alloy steel containing 0.9 to 26% chromium, and at least the sliding surface of the traveler is carburized and quenched to have a carbon content of 1.5 to 5%, and a spherical shape is formed. A surface layer in which the carbonized carbide protrudes on the surface is provided, a layer in which the amount of carbon gradually decreases is formed following the surface layer, and a nickel-phosphorus alloy plating layer having a coating hardness of Hv800 to 1100 is further formed on the surface of the surface layer. A ring for spinning machines that is characterized by its shape. (2) The amount of spheroidized carbides in the surface layer is 3 in terms of area ratio.
The ring for a spinning machine according to claim 1, which has a content of 0 to 90%. (3) Center line average roughness Ra of traveler sliding surface is 0.2
The ring for a spinning machine according to claim 1 or 2, which has a diameter of 5 μm or less. (4) The thickness of the nickel-phosphorus alloy plating layer is 2 to 10
The ring for a spinning machine according to claim 1, 2 or 3, which has a diameter of μm.