JPS5924210B2 - Manufacturing method of spindle blade for spinning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a spinning spindle blade.

Originally, the above-mentioned spindle blade was manufactured using high-carbon bearing steel, which was rough-machined, then quenched and tempered to obtain a specified hardness, and then polished to the specified dimensions. The insert is coated with hard chrome plating to prevent rust.

However, in this case, distortion occurs due to the internal stress of martensitic transformation that accompanies the quenching process, resulting in the bending. Therefore, it is necessary to take a large amount of polishing allowance, which requires a large number of processing steps, and hard chrome plating simply increases the price. In addition, there are disadvantages such as hydrogen embrittlement and pollution problems caused by dichromium wastewater.

Further, nitriding treatment as another means of obtaining a hardened surface layer is known as a heat treatment method that causes very little distortion due to internal stress.

However, in the nitriding process, the hardness of the core is determined by the heat treatment before nitriding, and in order to give the core the required hardness, it is necessary to increase the hardness before nitriding.

However, this has the disadvantage of significantly reducing machinability and nitriding properties, and is therefore self-limited. Therefore, even if a good nitrided layer is applied to the surface, the nitrided layer is extremely thin and lacks sufficient fatigue strength due to lack of internal hardness. There are disadvantages such as not being able to obtain

The present invention uses age-hardening nitriding steel that has the property of increasing hardness as the nitriding temperature is maintained by heating and holding at 900 to 1100 degrees for a predetermined time as a liquefaction treatment and then nitriding. , an object of the present invention is to provide a manufacturing method that reduces man-hours by applying ion nitriding treatment that has a high nitriding rate and causes extremely little deformation, and that also provides a new spindle blade that has excellent performance that cannot be obtained with conventional methods. The present invention will be specifically explained below.

FIG. 1 shows the steps of the manufacturing method of the present invention.
In the rough processing step, age-hardening nitriding steel of appropriate dimensions is rough-processed by cutting or forging, and then subjected to solution treatment.

The solution treatment conditions will of course vary depending on the material, etc., but the main components of the age-hardening cyclization steel used in this experiment are as follows.

This nitriding steel is held at 1000 degrees C0±100 degrees C for about 1 hour, and then air cooled or slowly cooled.

Through this treatment, chromium, molybdenum, and vanadium each precipitate as carbides and harden.

However, in this state, the Vickers hardness is approximately 350, which allows sufficient cutting.

The solution-treated rough material is cut and polished to a predetermined finished size.

(Finishing Process) Next, a surface hardening treatment is performed by nitriding the material in an ionized gas, so-called ion nitriding.

The ion nitriding is carried out at 550 degrees Celsius to 570 degrees Celsius for about 3 hours and then air cooled.

The hardened material is then polished using a puff or the like.

FIG. 2 shows the cross-sectional hardness distribution curve of the spindle blade completed through the above steps.

As shown in the figure, up to about 0.0.1 mm from the surface is a corrosion-resistant nitride layer with a micro Vickers (100,9) hardness of about 1000, and from about 0.017 Wffl to 0 from the surface.
．． Up to 27ML, approximately 500 to 1000 nitrogen diffusion layers,
The core part 0.2mm or more from the surface has a hardness of about 50% due to age hardening.
0 was obtained.

In addition, in order to compare the quality of rust prevention with conventional hard chrome plating, a salt water spray test (test conditions were JIS, Z
5% I-IJ chloride aqueous solution according to No. 2371, 35
When C) was carried out, the following results were obtained.

In other words, the ion-nitrided surface has much more rust-preventing power than the current hard chrome-plated product, and therefore, the ion-nitrided spindle blade does not require hard chrome plating or other anti-rust treatment. found.

FIG. 3 shows an enlarged cross-sectional photograph of a spindle blade completed by the method of the present invention.

The photo is a 400x enlarged photo etched with the etchant Nital, and clearly shows that the white part on the surface is a nitrided layer, and the core part is granular as a carbide crystal.

According to the method of the present invention, no distortion occurs due to heat treatment, and therefore, there is no need for grinding after heat treatment as in the conventional method, and the surface has high bearing performance and has various properties such as seizure resistance, abrasion resistance, and melting resistance. In addition to having the required hardness inside,
It also has high toughness and fatigue strength, and has better rust prevention than conventional hard chrome plating, making it possible to omit the plating process. When using a spinning spindle that requires fewer processing steps than the number of man-hours, there is less vibration and the spindle can rotate quietly at high speeds, making it possible to use spinning machines,
It has many excellent effects, such as being able to improve the production efficiency of yarn twisting machines, etc., and being able to provide excellent spindle blades at low cost.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of the manufacturing method of the present invention, FIG. 2 is a cross-sectional hardness distribution curve of a spindle blade produced by the method of the present invention, and FIG. 3 is an enlarged cross-sectional photograph of the same spindle blade.

Claims (1)

[Claims] 1 Using age-hardening steel for nitriding, there is a rough processing process such as cutting or forging, a solution treatment process for solutionizing the material components by heating, and a finishing process for cutting and polishing to the required finished dimensions. The spindle blade is subjected to a nitriding process and a polishing process using a puff, etc., and the surface of the spindle blade is given the required hardness with wear resistance and contact resistance by the nitrided layer, and the core is given hardness by aging treatment. A method for manufacturing a spindle blade for spinning, characterized by: