JPH05302223A - Production of spinning ring - Google Patents

Abstract

PURPOSE:To provide the spinning ring adaptable to the high-speed revolution of spindles, capable of significantly extending traveler working life, also of improving drawbacks in the conventional salt bath process. CONSTITUTION:As a ring material, a special steel containing >=0.8wt.% of carbon or a case-hardened steel with the carbon content of its surface brought to >=0.8wt.% through carburizing treatment is used. This material is made to react in a reactor fed with a chloride as reaction promoter where Al2O3 powder and vanadium powder are fluidized with an inert gas, to form a vanadium carbide layer 5-15mum depth with a hardness of >=2500HV on the ring material followed by quenching and annealing to bring the mechanical strength inside the ring to 800-900HV, and the area to be contacted with travelers is put to abrasive finishing, thus bringing the surface coarseness to <=0.5mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning ring, and more particularly to a method of manufacturing a spinning ring suitable for high speed rotation of a spindle.

[0002]

2. Description of the Related Art Conventionally, various methods have been tried to impart high hardness and wear resistance to a spinning ring. Generally, a method of obtaining a predetermined hardness by quenching and tempering treatment after carbonitriding treatment using case-hardening steel or non-oxidative quenching and tempering treatment using high carbon chromium bearing steel is also adopted. As another treatment, a method of forming a diffusion layer of metal carbide on the ring surface in a salt bath has been attempted.

[0003]

However, the number of rotations of the spindle is 15,000 to 18, regardless of which method is used.
The limit is 000 rpm, and if the number of spindle revolutions is increased beyond that, the ring wears prematurely and there are many yarn breaks, which is not suitable for practical use. Especially, the spindle speed is 17,000
When it is used at 0 rpm to 18,000 rpm, the life of the traveler is short at about 10 to 14 days, which is a factor of increasing running cost.

On the other hand, the method of forming the diffusion layer of the metal carbide in the salt bath requires a step of washing the salt adhering to the ring after the treatment, and since the salt bath is repeatedly used, the salt Due to deterioration of the ring quality due to deterioration, and when the ring is placed in the salt bath, the temperature of the salt bath will drop considerably and the reheating of the salt bath furnace will cause a preheating step to preheat the ring. Therefore, the production efficiency was low.

The present invention has been made in view of the above-mentioned points, and it is suitable for high-speed rotation of a spindle, greatly extends the life of the traveler, and manufactures a spinning ring which improves the drawbacks of the conventional salt bath method. The purpose is to provide a method.

[0006]

In order to achieve the above object, the present invention is configured as follows.

That is, in the method for producing a spinning ring of the present invention, a special steel containing 0.8% or more of carbon is used as a ring material to form a predetermined ring shape. Alternatively, case-hardening steel is used to form a predetermined ring shape, which is carburized to have a carbon content on the surface of 0.8% or more.

Next, the ring material is fluidized with an Al ₂ O ₃ powder and a vanadium powder with an inert gas, and a chloride is supplied as a reaction accelerator in a reaction apparatus at about 850 ° C. to 1 ° C.
By heating at a temperature of 000 ° C. for a predetermined time, a vanadium carbide layer having a depth of 5 to 15 μm and a hardness of 2500 H _V or more is formed on the surface of the ring material.

Furthermore, the internal strength in contact with the carbide layer by performing a quenching and tempering process for the adhesion strength of the surface carbides improve the 800~900H _V.

Then, the contact surface with the traveler is polished so that the surface roughness is 0.5 μ or less.

[0011]

According to the above structure, the vanadium carbide layer formed by the chemical reaction between vanadium and carbon of the ring material has a super hardness. Moreover, since the vanadium carbide layer is formed by using the fluidized bed, the washing step and the preheating step as in the case of using a salt bath are unnecessary, and the quality variation is reduced. Further, since the vanadium carbide layer has a thickness of 5 to 15 μm, there is no fear of peeling of the carbide layer. Furthermore, the surface hardness of the vanadium carbide layer is 2
And 500H _V or more, and, since the surface roughness was less 0.5μ by polished, it is possible to greatly reduce the frictional resistance index of the traveler.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a manufacturing process of an embodiment of the present invention.

FIG. 1A shows the case where special steel is used as the material, and FIG. 1B shows the case where case hardening steel is used as the material.

When a special steel containing 0.8% or more of carbon (SK material, SKS material, SKD material, SUJ material, etc.) is used as the material, it is formed by turning into a predetermined shape.

Case hardening steel (S15C, SCM41)
5, SNCM415, etc.), carburizing is performed after turning and forming into a predetermined shape.

These turning and carburizing treatments are the same as known methods.

Next, the above ring material is mixed with Al ₂ O ₃ powder 7
Vanadium powder such as 5-80% and ferrovanadium 2
0 to 25% is fluidized with an inert gas such as argon, and placed in a reaction apparatus supplied with 1 to 2% of chloride such as ammonium chloride as a reaction accelerator, and the temperature is about 850 ° C to 1000 ° C.
Heating at a temperature of ℃ for a predetermined time, for example, 0.5-2 hours,
Vanadium is diffused and permeated on the surface of the ring material to form a vanadium carbide layer.

The carbide layer which is produced by chemical reaction between the carbon and vanadium in this case the ring surface and exceeds the ultrahard 2500H _V. Moreover, since the fluidized bed is used in the diffusion permeation treatment, it is possible to form a vanadium carbide layer having a uniform thickness on the entire surface even if the ring material has a relatively complicated shape.

Therefore, since the Al ₂ O ₃ powder and the ferrovanadium powder are subjected to the fluidized bed treatment with the argon gas as compared with the conventional salt bath treatment, the preheating process is also performed due to the reheating characteristics of the fluidized bed (reheating is very fast). It is not necessary and the processing time is short.
/ 2 to 1/3), the salt bath washing step as a post-treatment can be omitted, and the variation in quality is reduced due to the gas reaction.

The thickness of the vanadium carbide layer can be adjusted appropriately depending on the processing conditions such as temperature and time.
It is optimal and preferably set to 15 μ. When the thickness is more than that, the adhesion between the material (base material) and the vanadium carbide is inferior, and there is a risk of peeling. On the other hand, if the thickness is less than that, it is worn early against the repeated load of the traveler and is inferior in durability.

[0022] then the ring material was subjected to quenching and tempering the carburized portion of the hardness (base material hardness immediately below the vanadium carbide layer in the case of special steel) to 800~900H _V. Thereby, the occurrence of depression of the vanadium carbide layer on the surface can be prevented. Moreover, the adhesion of the carbide layer is further improved and becomes good.

Thereafter, the contact portion with the traveler is finished to a mirror surface of 0.5 μ or less by polishing finish. By doing so, a ring having a surface hardness of 2500 H _V or more and a fine surface roughness can be obtained, so that the frictional resistance index with the traveler can be greatly reduced, the initial familiarity is improved, and the traveler life is also improved. It can be extended significantly.

FIG. 2 is an enlarged vertical sectional view of the spinning ring manufactured by the above method. FIG. 2A shows the spinning ring 1 made of special steel, and FIG.
Is a spinning ring 2 formed of case-hardening steel.

In these figures, 3 is a core portion, 4 is a carburized layer, and 5 is a vanadium carbide layer.

FIG. 3 is a microscopic photograph of a cross section, in which the carburized layer 4 has fine needle-like martensite formed by quenching. The core portion 3 in FIG. 2A is about 800 to 850H.
A hardened structure of _V is formed.

FIG. 4 shows the hardness distribution of the cross section. However,
The vertical axis represents Vickers hardness (H _V ) and the horizontal axis represents the depth (mm) from the surface. In the figure, A is a case-hardening steel-made spinning ring of the present invention, B is a special steel-made spinning ring of the present invention, and C is a conventional spinning ring. Surface hardness of the spinning ring A of the present invention is about 3000H _V, the hardened the underlying is about 800~850H _V. In addition, spinning ring B
The surface hardness of about 3200H _V, the hardened the underlying about 8
It is a 50~900H _V.

FIG. 5 shows the ring-traveler frictional resistance index in the early stage of spinning. However, the spinning conditions are as shown in Table 1 below.

[0029]

[Table 1]

The conventional product C is a normal ring whose traveler contact surface is roughened. As is clear from the figure, the spinning ring A of the present invention has a very small frictional resistance index as compared with the conventional product C, and the conventional product takes a considerable time to stabilize, but the present invention ring immediately stabilizes. ..

FIG. 6 is a graph of measurement results showing the relationship between the spindle rotation speed and the yarn breakage count. However, the spinning conditions are as shown in Table 2 below.

[0032]

[Table 2]

The conventional product C has a spindle speed of 18,000.
When it exceeds 0 rpm, the number of yarn breaks increases rapidly. Therefore, it cannot be used at any further rotation.

On the other hand, the spinning ring A of the present invention is
The number of yarn breakages hardly increases up to around 25,000 rpm. And the number of thread breaks is also small.

Table 4 below shows the amount of traveler wear when spinning was carried out under the spinning conditions shown in Table 3 below.

[0036]

[Table 3]

[0037]

[Table 4]

According to this, since the ring (A) of the present invention reduces the frictional resistance with the traveler as described above, the wear amount of the traveler is about 1/3 to that of the conventional general ring (B).
It becomes 1/4 and the life of the traveler can be greatly improved.

[0039]

According to the present invention, a vanadium carbide layer is formed on the surface, and the contact surface with the traveler is polished to give a mirror-finished surface roughness of 0.5 μ or less. The property is good, the frictional tension with the traveler does not fluctuate at ultra-high speed rotation, the number of yarn breaks is reduced, and it has abrasion resistance. Since the vanadium carbide layer has a thickness of 5 to 15 μm and is subjected to quenching and tempering treatment,
Adhesion of the layer is kept good, there is no risk of peeling, and because the material itself has the required hardness, the adhesion with the vanadium carbide layer is good and the hardness of the ring base material directly under the carbide layer is increased. The vanadium carbide layer does not sink. Therefore, abnormal wear does not occur on the traveler contact surface. Therefore, the number of rotations of the spindle exceeds 18,000 rpm, which has been the limit of the past, and 2
Spinning can be performed stably even at 5,000 rpm, the life of the traveler is significantly improved, and the cost of spinning can be greatly reduced.

Further, as compared with the conventional method of producing a metal carbide by a salt bath, since a fluidized bed is used, post-treatment such as washing and a preheating step can be omitted, and variations in the carbide layer are reduced, so that the production efficiency is greatly improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a manufacturing process of the present invention.

FIG. 2 is an enlarged vertical sectional view of a spinning ring manufactured by the method of the present invention.

FIG. 3 is a microscopic photograph of a cross section.

FIG. 4 is a diagram showing a hardness distribution of a cross section.

FIG. 5 is a view showing a ring-traveler frictional resistance index in an early stage of spinning.

FIG. 6 is a diagram showing the relationship between the spindle rotation speed and the yarn breakage number.

[Explanation of symbols]

 1, 2 Spinning ring 4 Carburized layer 5 Vanadium carbide layer

Claims (2)

[Claims] 1. A ring material made of special steel containing 0.8% or more of carbon is fluidized with Al ₂ O ₃ powder and vanadium powder with an inert gas and chloride is supplied as a reaction accelerator. In the reaction apparatus, the ring material is heated at a temperature of about 850 ° C. to 1000 ° C. for a predetermined time to a depth of 5 to 1 on the surface of the ring material.
Forming a vanadium carbide layer above hardness 2500H _V at 5 [mu], then quenching, is subjected to tempering hardness immediately below the carbide and 800～900H _V, subsequently, following surface roughness 0.5μ the contact surface between the traveler A method for producing a spinning ring, which comprises subjecting the ring to polishing. 2. A ring material formed of case-hardening steel is carburized in advance so that the surface carbon content is 0.8% or more. The ring material is made of Al ₂ O ₃ powder and vanadium powder. In a reactor in which chloride was supplied as a reaction accelerator by fluidizing with an active gas, the ring material surface was heated at a temperature of about 850 ° C. to 1000 ° C. for a predetermined time to a depth of 5 to 15 μ.
In forming the vanadium carbide layer above hardness 2500H _V, then quenching, is subjected to tempering hardness immediately below the carbide and 800～900H _V, subsequently, the surface roughness 0.5μ following the contact surface between the traveler A method for manufacturing a spinning ring, which comprises performing a polishing process.