JP2017088989A - Cleaning method of iron-based component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method of an iron-based component capable of preventing generation of rust due to a droplet on a surface where the droplet containing hardening oil is adhered to the surface of an iron-based component after cleaning.SOLUTION: An iron-based component is cleaned by using a cleaning liquid with a surfactant added at 0.1 to 0.5 mass%, desirable 0.2 mass% after conducting a hardening treatment of the iron-based component by using a hardening oil. As the surfactant, using a surfactant containing no alkali metal component such as Ca, Na, Mg or K is desired.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for cleaning iron parts. More specifically, the present invention relates to a method for cleaning an iron-based component that has been subjected to a quenching process using a quenching oil.

  A sintered part obtained by molding and sintering an iron-based powder material is subjected to a sizing treatment as necessary and then subjected to a treatment for increasing the strength. As such a treatment, a heat treatment is widely performed in which a sintered part is quenched and then tempered.

  Quenching is performed by heating the sintered part to a high temperature of, for example, about 870 ° C., and then immersing the heated sintered part in quenching oil and cooling the oil. The oil-cooled sintered part is tempered by being heated to a temperature of about 200 ° C., for example.

  When the oil-cooled sintered parts are tempered as they are, the quenching oil adhering to the sintered parts burns and soot is generated, and the soot adheres to the sintered parts and impairs the appearance. The sintered parts subjected to the above are washed with hot water or water. The sintered parts are cleaned by immersing the sintered parts in hot water or water filled in the washing tank and swinging the sintered parts, or by blowing bubbles to the sintered parts (bubbling). Has been done.

  However, when the sintered part is pulled up from the washing tank after washing, water droplets w in which a cleaning liquid (hot water or water) and quenching oil are mixed may adhere to the sintered part (see FIG. 3). The quenching oil released from the surface of the sintered part by the above-described peristalsis or bubbling rises to the surface of the cleaning liquid made of hot water or water in the cleaning tank. The quenching oil floating on the liquid level is removed from the tank by overflowing it, but the quenching oil that cannot be completely removed and remains on the liquid level is mixed with the cleaning liquid to form water droplets w that are pulled up from the tank. It will stick.

  When the water droplets w containing oil remain on the surface of the sintered part, the components of the cleaning liquid are condensed in the contour shape of the water droplets w, that is, in the ring shape, in the tempering process. The hot water or water (tap water or industrial water) that is the cleaning liquid contains chlorine, but since the chlorine in the condensed cleaning liquid components activates the reaction between iron and oxygen, ring-shaped rust is formed on the sintered parts. (Refer to the inside of the circle in FIG. 4).

  The present invention has been made in view of such circumstances, and prevents water droplets containing quenching oil from adhering to the surface of the iron-based parts after cleaning and preventing rust caused by the water droplets from being generated on the surface. An object of the present invention is to provide a method for cleaning an iron-based component that can be performed.

A method for cleaning an iron-based component according to one aspect of the present invention is a cleaning method for cleaning the iron-based component after performing a quenching treatment of the iron-based component using a quenching oil,
The iron-based component is cleaned using a cleaning solution to which 0.1 to 0.5% by mass of a surfactant is added.

  According to the said invention, it can prevent that the water droplet containing hardening oil adheres to the surface of the iron-type components after washing | cleaning, and the rust resulting from the said water droplet generate | occur | produces on the said surface.

It is explanatory drawing of one Embodiment of the washing | cleaning method of this invention. It is a photograph which shows a part of surface of the sintered component pulled up from the washing tank in the washing | cleaning method which concerns on one Embodiment of this invention. It is a photograph which shows the water droplet which generate | occur | produced on the surface of the iron-type components in the conventional cleaning method. It is a photograph which shows the ring-shaped rust which generate | occur | produced on the surface of the iron-type components resulting from the water droplet.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.
A method for cleaning an iron-based component according to one embodiment of the present invention (hereinafter, also simply referred to as “cleaning method”),
(1) A cleaning method for cleaning an iron-based component after quenching the iron-based component using quenching oil,
The iron-based component is cleaned using a cleaning solution to which 0.1 to 0.5% by mass of a surfactant is added.

In the cleaning method according to this aspect, the iron-based parts after quenching are cleaned using a cleaning liquid to which a predetermined amount of a surfactant is added. Since the surfactant is added, the separation of the quenching oil adhering to the surface of the iron-based part from the surface is promoted, and the separated quenching oil is dispersed by the surfactant and contains a cleaning liquid. It collects at the edge or corner of the tank. For this reason, the amount of oil that floats near the center of the liquid level in the cleaning tank is reduced. Furthermore, the addition of a surfactant increases the wettability, so when pulling up an iron-based part from the cleaning tank, the iron-based part is totally and uniformly wetted, and conventional water droplets are exposed to the surface of the iron-based part. There is nothing that can be done. For this reason, ring-shaped spots (cleaning liquid components condensed by drying) due to water droplets are not generated, and as a result, the chlorine in the condensed cleaning liquid components activates the reaction between iron and oxygen and rings into sintered parts. Generation of rust in the shape can be prevented.
In addition, when the addition amount of the surfactant is less than 0.1% by mass, the effect of the surfactant described above is small, and water droplets may remain on the surface of the iron-based component, while the addition amount of the surfactant If it exceeds 0.5 mass%, soot may be generated due to the surfactant during tempering and may adhere to iron-based parts.

(2) In the cleaning method of (1) above, it is desirable that the amount of the surfactant added is 0.2% by mass. In this case, water droplets mixed with quenching oil can be effectively prevented from adhering to the surface of the sintered part, and ring-shaped rust can be prevented from occurring in the sintered part.

(3) In the cleaning method of (1) or (2), the surfactant is preferably a surfactant that does not substantially contain a metal component. In this case, the residue resulting from the metal component after tempering can be prevented from remaining on the surface of the iron-based component.

(4) In the cleaning methods of (1) to (3) above, the iron-based component can be a sintered component obtained by molding and sintering an iron-based powder material.

[Details of the embodiment of the present invention]
Hereinafter, the cleaning method of the present invention will be described in detail. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included.

  In the cleaning method according to the present embodiment, a compact or green compact obtained by forming an iron-based powder material into a desired shape using a powder molding apparatus is heated to obtain a sintered part, and sizing is performed as necessary. This is a cleaning method performed after quenching the sintered part.

  The quenching process is performed by heating the sintered part to a high temperature of, for example, about 870 ° C., and then immersing the heated sintered part in quenching oil and cooling the oil.

  Quenching oil is attached to the surface of the oil-cooled sintered part. If the attached quenching oil is left as it is and the sintered part is tempered, the quenching oil attached to the sintered part burns and soot is generated. Then, since the soot adheres to the sintered parts and impairs the appearance, the sintered parts subjected to the quenching treatment are washed with hot water or water (tap water or industrial water). In tap water or industrial water, chlorine for disinfection remains.

  As shown in FIG. 1, the washing is performed by immersing the oil-cooled sintered part 3 in a washing tank 2 filled with a washing liquid 1 made of hot water or water, and the sintered part 3 in this state is moved by a peristaltic mechanism (FIG. 1). (Not shown), or by blowing bubbles to the sintered part 3 (bubbling). Air bubbles may be sprayed on the sintered part 3 while the sintered part 3 is being oscillated. The peristaltic movement is performed, for example, for about 2 minutes, and the bubbling is performed, for example, for about 2 minutes.

  In the present embodiment, 0.1 to 0.5 mass% of a surfactant is added to the cleaning liquid 1. By adding the surfactant, it is possible to accelerate the quenching oil adhering to the surface of the sintered part 3 from detaching from the surface. Further, the separated quenching oil is dispersed by the surfactant and accumulates at the edge or corner 2a of the cleaning tank 2. The quenching oil 4 gathered at the edge or corner 2a can be moved into the waste liquid collecting section 5 disposed adjacent to the cleaning tank 2 by overflowing the cleaning liquid 1 in the cleaning tank 2. . Thereby, the amount of oil in the vicinity of the center of the liquid surface 2b of the cleaning tank 2 can be reduced.

  In addition, since the wettability of the cleaning liquid is increased by adding the surfactant, the sintered part 3 is as shown in FIG. 2 when the sintered part 3 is pulled up from the cleaning tank 1 after the cleaning process is completed. In general, water droplets that are uniformly and wet and mixed with quenching oil as in the prior art are not formed on the surface of the sintered part 3. For this reason, there is no ring-shaped stain (cleaning liquid component condensed by drying) due to water droplets, and as a result, the chlorine in the condensed cleaning liquid component activates the reaction between iron and oxygen to the sintered part 3. Generation of ring-shaped rust can be prevented.

  As the surfactant, for example, Cylestrite W-1M (trade name; manufactured by Cylest Co., Ltd.) and the like can be used. Although not particularly limited in the present invention, Ca, Na, Mg, K, etc. It is desirable to use a surfactant that does not contain an alkaline metal component. By using a surfactant that does not contain a metal component, it is possible to prevent residues resulting from the metal component from remaining on the surface of the sintered part 3 after tempering.

  The addition amount of the surfactant is in the range of 0.1 to 0.5% by mass. When the addition amount of the surfactant is less than 0.1% by mass, the effect of the surfactant described above is small, and water droplets may remain on the surface of the sintered part 3, while the addition amount of the surfactant is If it exceeds 0.5 mass%, soot may be generated due to the surfactant during tempering and may adhere to the sintered part 3. Within the above-mentioned range, the addition amount of the surfactant is desirably 0.2% by mass, and when this amount is such that water droplets mixed with quenching oil adhere to the sintered part 3. It can prevent effectively, and it can prevent that ring-shaped rust generate | occur | produces in the said sintered component 3. FIG.

[Other variations]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.
For example, in the embodiment described above, a sintered part produced from an iron-based powder material is subjected to a quenching treatment using a quenching oil and then cleaned, but the cleaning method of the present invention is an iron-based material other than a sintered part. It can be applied to all parts. For iron-based parts other than sintered parts that are quenched with quenching oil, adding 0.1-0.5% by mass of surfactant to the cleaning liquid will add water droplets to the surface of the iron-based parts. It is possible to prevent the ring-shaped rust due to the occurrence.

  Further, in the above-described embodiment, the cleaning method is described for the quenching oil used at the time of quenching. However, when sizing treatment is performed using sizing oil, the sizing oil adheres to the surface of the sintered part. In other words, the surfactant can exert the same effect on the sizing oil as on the quenching oil. Therefore, the cleaning method of the present invention can also be applied to sintered parts to which sizing oil is attached together with quenching oil.

1: Cleaning liquid 2: Cleaning tank 2a: Edge or corner 2b: Liquid surface 3: Sintered parts 4: Quenching oil 5: Waste liquid recovery part w: Water droplet

Claims (4)

A cleaning method for cleaning an iron-based part after quenching the iron-based part using quenching oil,
A method for cleaning an iron-based component, wherein the iron-based component is cleaned using a cleaning liquid to which 0.1 to 0.5% by mass of a surfactant is added.   The method for cleaning an iron-based component according to claim 1, wherein the addition amount of the surfactant is 0.2% by mass.   The method for cleaning an iron-based component according to claim 1 or 2, wherein the surfactant is a surfactant that does not substantially contain a metal component. The method of cleaning an iron-based component according to any one of claims 1 to 3, wherein the iron-based component is a sintered component obtained by molding and sintering an iron-based powder material.