JPS6328921A - Ring for spinning - Google Patents

Abstract

PURPOSE:To obtain the titled ring having little generation of wavy abrasion, etc., and excellent durability owing to fine metal carbide formed in the hardened surface layer, by forming a ring from a low-carbon chromium molybdenum steel and subjecting the ring to gas-carbonitriding and hardening treatments. CONSTITUTION:A ring stock is formed by machining a steel containing 0.1-0.3(wt)% C, 0.8-1.5% Cr and 0.1-0.3% Mo. The ring is subjected to gas- carbonitriding treatment to attain an effective carbonization depth of 0.5-1mm and hardened to form fine metal carbide particles in the hardened surface layer of the ring. Usually, the product is further subjected to a surface-treatment to obtain the objective ring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a spinning ring, particularly to a spinning ring suitable for spinning thick yarn and the like.

(Prior Art) Conventionally, various measures have been taken to improve the wear resistance of spinning rings. Generally, a method is adopted in which case-hardened steel is used, and after cutting and forming, a carburizing treatment is performed, and a predetermined hardness is imparted by quenching and tempering.

A method of quenching and tempering after cutting and forming has also been proposed.

(Problems to be Solved by the Invention) However, sufficient wear resistance cannot be obtained by any of the methods, and a ring having even more durability is desired. Particularly when spinning medium and large counts, the centrifugal force applied to the traveler becomes large, and this causes peeling of the high hardness layer, wavy wear, or waviness wear on the traveler running surface of the ring (however, wavy wear refers to small-pitch This results in uneven wear (undulating wear refers to wear with a large pitch), etc.

This causes problems such as yarn breakage, fluctuations in spinning force, and yarn fluff, making it impossible to perform stable spinning over a long period of time.

(Means for Solving the Problems) As a result of experiments, the present inventor discovered that durability can be increased by making the metal structure finer, and has arrived at the present invention.

That is, in the present invention, C: 0.1 to 0.3% by weight, Cr: 0
．． 8, a ring material was formed by cutting, gas carbonitriding treatment and quenching treatment were performed, and fine metal carbide was formed in the surface hardening layer.

(Function) According to the experimental results, compared to rings made of conventional case-hardened steel and case-hardened, and rings made of high-carbon chromium steel and zero-quenched, wavy wear etc. were reduced and durability was increased. .

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a process diagram showing the procedure for manufacturing a spinning ring of the present invention. C:O as material.

1-03% by weight, Cr: 0.8-1.5% by weight, MO:
Steel containing 1 to 0.3% by weight of O, such as low carbon chromium molybdenum W48CM415.

First, a required ring material is formed from this material by cutting, and then gas carbonitriding treatment is performed. In this case, the effective carburizing depth is approximately 0.5 to 1. It is preferable to be about 0.0 mm.

Then, quenching (approximately 830° C.) and tempering (approximately 170° C.) are performed. However, during hardening, tempering may be omitted by hot quenching.

Thereafter, surface treatment is performed to finish the surface to a desired roughness (for example, about 3 μm).

S in FIG. 1 is a hardened surface layer formed on the outer surface of ring A. This surface hardening layer S is made of chromium carbide,
As molybdenum carbides are dispersed in martensite, these carbides become ultra-fine carbides due to the characteristics of chromium-molybdenum steel, and fine martensite is also formed by carbonitriding the matrix martensite. .

FIG. 2 and subsequent figures show a comparison between the ring A according to the present invention and a conventional ring. However, B is after case hardening steel is gas carburized.
The ordinary ring C which has been quenched and tempered is made of high carbon chromium bearing steel (SUJ 2 ), which is cut and then subjected to a predetermined quenching and tempering treatment.

FIG. 2 is a procedure for a ring durability test, and FIG. 3 is a view taken along the line X--X in FIG. 2. In this durability test, we conducted a severe test in order to quickly find out the test results, so collars 2 and 3 were attached to the top and bottom of the spindle blade L, and four travelers TI-T4 were fitted to the measuring ring. Loosely attach four spun yarns 5t-94 between the upper and lower collars 2.3. The above traveler Tl~ is applied to these threads S1~S4.
T4 is engaged, a ballooning is formed by the rotation of the spindle blade I, and the wear status of the ring is measured. In the figure, 4 indicates a warb attached to the spindle blade 1,
A suitable drive belt (not shown) is engaged.

The test procedure is as follows.

Spindle rotation speed 14,000 rpm Spun yarn 10 count cotton traveler
O827゜Ring shape (nominal dimension) 3
．． 2x 46x 57.5 Test time 70 hours (However, as mentioned above, this is a severe test, and according to a comparative test, 70 hours
The time test corresponds to more than 11,000 hours of normal use.

Next, FIG. 4 shows the results of a 70-hour durability test.

Ring A of the present invention also suffered some waviness a, but
Its maximum abrasion value a3 was 6μ. On the other hand, ring B made of case-hardened steel causes waviness wear, the maximum value of which is 1.
It reached 0μ. Furthermore, wavy wear b36 occurred on this ring B. Also, bearing steel ring C has a large amount of waviness wear.
Its maximum value C6 reaches 14 μ, and a large number of wavy wear c
3 also occurred.

Observing this state, after 70 hours,
Not only the bearing steel ring C but also the case hardened steel ring B has a large running resistance of the traveler and has a large number of thread breakages, so that the ring needs to be replaced.

There are various possible causes for the occurrence of waviness and wavy wear in the conventional case-hardened steel rings, etc., but one of them is the size of the crystal grains of martensite and various metal carbides that form the surface hardening layer. considered to be a thing. In the spinning ring of the present invention, each crystal is miniaturized, and it is considered to be resistant to sliding wear.

(Effects) As described above, the present invention uses low carbon chromium molybdenum steel as the ring material and performs gas carbonitriding treatment, so that ultrafine chromium carbide and molybdenum carbide are generated in the surface layer. Furthermore, the martensite in the matrix can be made into a fine structure by performing nitriding treatment in conjunction with carburizing, so that the surface hardness is uniform, reducing the occurrence of wavy wear and waviness wear, and increasing durability. It has the effect of

[Brief explanation of the drawing]

Figure 1 is a process diagram showing the manufacturing procedure for the ring of the present invention, Figure 2 is
The figure is an explanatory diagram of the ring durability test procedure, Figure 3 is a view taken along the X-X line in Figure 2, and Figure 4 is a roughness measurement graph of the traveler sliding surface after a 70-hour durability test. . A is a spinning ring of the present invention. Applicant Nippon Spindle Manufacturing Co., Ltd. Agent Patent Attorney Oka 1) Hide Kazu Figure 1

Claims (1)

[Claims] (1) C: 0.1-0.3% by weight, Cr: 0.8-1.
Using steel containing 5% by weight and 0.1 to 0.3% by weight of Mo, a ring material is formed by cutting, followed by gas carbonitriding and quenching to form fine metal carbides in the hardened surface layer. A spinning ring characterized by: