CN117378127A - Rotor, rotary apparatus using the same, and method of producing the same - Google Patents

Abstract

The rotor (10) of the disclosed technology has the following features. The rotor (10) includes: a rotating central part (14) made of magnesium alloy, formed with an anodized coating, and chemically synthesized; and a rotating peripheral part (15) made of titanium alloy or CFRP. The rotating central part (14) and the rotating peripheral part (15) are of fitting size, and the Vickers hardness of the anodized coating is 300 [Hv] or more.

Description

Rotor, rotating equipment using the rotor, and method of producing the rotor

Technical field

The disclosed technology relates to a rotor and a rotating equipment using the rotor.

Background technique

Technology that integrates metal and resin is required in a wide range of fields, including manufacturing parts for industrial equipment. Various combinations of metal and resin can be considered. As an example, a combination of magnesium alloy and CFRP is considered.

For example, Patent Document 1 discloses a technology in which CFRP is bonded to a magnesium alloy using an epoxy adhesive to produce a composite of magnesium alloy and CFRP. More specifically, the technology related to Patent Document 1 includes a chemical synthesis treatment step of immersing a magnesium alloy component in an aqueous solution containing permanganate to form ultrafine unevenness on the surface.

Prior technical documents

patent documents

Patent Document 1: International Publication Number: WO2008/133096

Contents of the invention

Invent the problem to be solved

There is also a demand to integrate magnesium alloy and CFRP into rotors that constitute rotating equipment. However, when the technology disclosed in Patent Document 1 is applied to a rotor, there is a problem that the strength of the surface layer of the portion subjected to the chemical synthesis process decreases, and in this state, the rotor cannot be used for high-speed rotating equipment.

The purpose of this disclosed technology is to solve the above-mentioned problems and provide a rotor manufactured by integrating magnesium alloy and CFRP and a rotating equipment including the rotor.

Solutions for solving problems

The rotor according to the disclosed technology has the following characteristics. The rotor includes: a rotating central part made of magnesium alloy, formed with an anodized coating and chemically synthesized; and a rotating peripheral part made of titanium alloy or CFRP, the rotating central part and the rotating peripheral part is the fitting size, and the Vickers hardness of the anodized coating is 300 [Hv] or more.

Effect of the invention

The rotor of the disclosed technology is equipped with an anodized coating having a Vickers hardness of 300 [Hv] or more. Therefore, the coating applied to the magnesium alloy does not cause cracks to reduce the strength of the surface layer. The disclosed technology using an anodized coating realizes a rotor integrating magnesium alloy and CFRP, and provides a rotating equipment equipped with the rotor.

Description of the drawings

FIG. 1 is a central cross-sectional view of the rotating equipment according to Embodiment 1 when viewed from the right side.

FIG. 2 is a front view and a rear view of the rotating device shown in FIG. 1 after deformation.

3 is a second central cross-sectional view of the rotating equipment according to Embodiment 1 when viewed from the right side.

FIG. 4 is a front view and a rear view of the rotating device shown in FIG. 3 after deformation.

FIG. 5 is a deformed front view and a rear view of the rotating device shown in FIG. 1 .

Detailed ways

Embodiment 1

FIG. 1 is a central cross-sectional view of the rotating equipment 100 according to Embodiment 1 when viewed from the right side. As shown in FIG. 1 , the rotating device 100 includes a rotor 10 and a stator 20 . In addition, the rotating device 100 is covered with an outer housing 30 (not shown). The rotor 10 includes an iron core 11 , a magnet 12 , a shaft portion 13 , a rotating central portion 14 , a rotating peripheral portion 15 , and a fastening member 16 .

The rotating central portion 14 of the rotor 10 is made of magnesium alloy material. The magnesium alloy material used for the rotating central part 14 may be cast or extruded. Specifically, the magnesium alloy material may be any one of AZ31, AZ61, AZ91D, ZK10, ZK60, AZX612, WE43, EV31, AE41A, WE54A, AMX602, AZX912, and Mg-Zn-Y series alloys. Magnesium alloy materials can be either O materials or H24 materials when classified by quality. In addition, in order to obtain strength properties, magnesium alloy materials can be subjected to T5 heat treatment, T6 heat treatment or other heat treatments or processing treatments.

When rotating equipment 100 is used in aircraft, rail cars, and other transportation vehicles, it is important not to burn. The magnesium alloy material used in the present disclosed technology may be added with Ca or rare earths in order to exhibit flame retardancy. Examples of flame-retardant magnesium alloy materials include AZX612, AZX912, WE43, and EV31.

The rotating center portion 14 of the rotor 10 is provided with an anodized coating for magnesium. The Vickers hardness of the anodized coating of the rotating center portion 14 is preferably 300 [Hv] or more. The anodized coating provided on the rotating central portion 14 may be a coating produced by a conventional HAE method, or may be a PEO (Plasma Electrolytic Oxidation) coating. The method of forming an anodized coating on the rotating central part 14 may be a method of producing a PEO coating from a liquid using sodium silicate, sodium phosphate, ammonium phosphate, sodium aluminate or ammonium salt, or may be plasma electrolytic deposition. coating technology. When the rotating center portion 14 is subjected to the anodizing treatment, the fluorine treatment may be performed in parallel.

The main reason why a coating with a Vickers hardness of 300 [Hv] or more is required is to prevent damage during the assembly process of the rotor 10 and to prevent damage that may occur to the rotating equipment 100 during operation. Although the upper limit of the hardness of the coating is not limited in specifications, it can be said to be 2000 [Hv] or less due to limitations of the manufacturing method. Generally, even if the anodized coating is a PEO-based coating with low porosity, porosity actually exists. From the viewpoint of preventing cracks in the coating reaching the base even if there is a certain degree of variation in coating thickness and coating hardness, the hardness of the anodized coating of the rotating center portion 14 is preferably 1700 [Hv] or less, and more preferably 1400 [Hv] below.

From the viewpoint of corrosion resistance, the thickness of the anodized coating on the rotation center portion 14 is preferably 5 [μm] or more, and for greater reliability, it is more preferably 10 [μm] or more. The upper limit of coating thickness depends on the alloy material and processing method, but generally it is approximately 40 [μm]. When the coating thickness exceeds the upper limit, the coating will rupture. Therefore, the thickness of the anodized coating of the rotation center portion 14 is preferably 30 [μm] or less, and more preferably 25 [μm] or less.

The rotating center portion 14 according to the disclosed technology is subjected to a chemical synthesis process after the anodized film is formed. The chemical synthesis treatment is performed in order to form a chemical synthesis treatment film and prevent the base body of the rotating central portion 14 made of magnesium alloy material from cracking.

In addition, although it is not essential, heat treatment may be performed on the rotating center portion 14 after the anodized film is formed and before the chemical synthesis treatment is performed. The heat treatment may be performed, for example, about 5 to 100 times of a heating and cooling cycle from 180 [°C] to -65 [°C].

Considering the environment in which rotating equipment 100 is typically used, the largest cause of corrosion is salt. This is called salt damage, but the chloride ions in the salt cause magnesium alloys to corrode. Therefore, in order to protect against corrosion based on chloride ions, it is preferable that the chemical synthesis treatment performed on the rotating central portion 14 is accompanied by a reaction based on fluoride ions.

It is also conceivable to use chromic acid for the chemical synthesis treatment performed on the rotating center portion 14 . However, from the viewpoint of environmental restrictions, the chemical synthesis treatment preferably does not contain chromic acid. For example, zirconium using fluoride may be used for the chemical synthesis treatment performed on the rotating center portion 14 . To give a specific example, in the chemical synthesis treatment, a treatment liquid in which an ammonium fluorozirconate salt is dissolved and the pH is adjusted to a range of 2.5 to 4.5 can be used. A chemical synthesis process using fluoride is used to form a fluorinated surface layer on the metal. The fluorinated surface layer that is a chemically synthesized treatment film is also called a fluorinated coating. The advantage of this method is that it can be easily inspected using fluorescent X-rays after the chemical synthesis process. Chemical synthesis treatment can either replace zirconium and form a coating with atoms such as Mo, V, Ti, etc. that can eutectoid with zirconium, or it can eutectoid with silicon compounds. In addition, phosphoric acid or organic acid may be added together with the chemical synthesis treatment.

The required functions of the chemically synthesized film are to provide corrosion resistance and to prevent the coating from becoming a weak boundary layer. From the above point of view, the film thickness of the chemical synthesis treatment film is actually about 15 [nm] or more and less than 1 [μm]. The film thickness of the chemical synthesis treatment film of the rotation center portion 14 of the disclosed technology is preferably 30 to 500 [nm]. Here, the thickness of the coating is ideally measured by cross-sectional observation using a transmission electron microscope. However, the thickness of the coating can also be estimated as the SiO ₂ converted film thickness when sputtering is performed using a spectroscopic method such as XPS.

The rotation peripheral portion 15 of the rotor 10 of the present disclosed technology is made of carbon fiber reinforced plastic (hereinafter referred to as "CFRP"). The carbon fibers constituting CFRP may be PAN carbon fibers or pitch carbon fibers. The form of carbon fiber can be any of unidirectional materials, cloth, short fibers, non-woven fabrics, etc. From the viewpoint of versatility and performance stability, the rotation peripheral portion 15 of the present disclosed technology preferably uses carbon fibers such as PAN-based continuous fibers.

Examples of resins used as the matrix of CFRP include thermoplastic resins such as polypropylene and polyamide, and thermosetting resins such as epoxy resin, phenolic resin, and unsaturated polyester resin. Considering the adhesion and mechanical properties to carbon fiber, epoxy resin is suitable.

Examples of CFRP forming methods include stamping forming, autoclave forming, and sheet winding. In either molding method, the matrix resin composition is subjected to pressure and cured by heat.

In addition, the CFRP molding method can also use a range transfer molding technology called the RTM method. The RTM method is the following method: carbon fiber substrates such as carbon fiber fabric are cut, laminated, and shaped to make a preform, the preform is placed in a mold, the mold is closed, and resin is injected and impregnated into the preform. After solidifying, open the mold and take out the molded product.

The rotating peripheral part 15 may also be made of titanium alloy instead of CFRP.

The dimensions of the shaft portion 13 and the rotational center portion 14, and the rotational center portion 14 and the rotational peripheral portion 15 are determined by fitting (see FIG. 1). The fitting part can also be tapered. As shown in FIG. 1 , the rotating central part 14 and the rotating peripheral part 15 may be fastened by a fastening member 16 . The fastening members 16 may be bolts and nuts, for example. In addition, although not shown in the figure, stainless steel bolts may be used to fasten the iron core 11 and the rotating central portion 14 .

FIG. 2 is a deformed front view and a rear view of the rotating device 100 shown in FIG. 1 . The right side of Figure 2 is a front view, and the left side of Figure 2 is a rear view. As shown in FIG. 2 , the shaft portion 13 and the rotating central portion 14 , and the rotating central portion 14 and the rotating peripheral portion 15 respectively adopt a structure in which a key is inserted into a keyway (hereinafter referred to as a "keyway structure"). Keys can be chamfered so that stress is not concentrated in the corners.

After the rotation central part 14 and the rotation peripheral part 15 are integrated, they may be painted in order to improve corrosion resistance. In addition, when there is a gap between the rotation central portion 14 and the rotation peripheral portion 15, the gap may be filled with a resin having low viscosity adhesiveness after integration.

FIG. 3 is a second central cross-sectional view of the rotating equipment 100 according to Embodiment 1 when viewed from the right side. FIG. 4 is a deformed front view and a rear view of the rotating device 100 shown in FIG. 3 .

The right side of Figure 4 is a front view, and the left side of Figure 4 is a rear view. The rotating equipment 100 shown in FIGS. 3 and 4 is provided with a rotating central portion 14B with a shaft made of a magnesium alloy material instead of the shaft portion 13 and the rotating central portion 14 . The rotor 10 of the disclosed technology may be configured to include a rotating center portion 14B with a shaft.

FIG. 5 is a deformed front view and a rear view of the rotating device 100 shown in FIG. 1 . The right side of Figure 5 is a front view, and the left side of Figure 5 is a rear view. As shown in FIG. 5 , the shapes of the keys and keyways used in the present disclosure may also have curved surfaces. The shape, size and number of keyway structures can be determined based on appropriate design.

If the rotor 10 of the present disclosure technology is summarized from the viewpoint of the production method, the process includes: a step of forming an anodized coating with a Vickers hardness of 300 [Hv] or more on the rotating central portion 14 made of magnesium alloy; The steps of subjecting the rotating central portion 14 having an anodized coating to chemical synthesis treatment; and the step of fitting the rotating central portion 14 to the rotating peripheral portion 15 .

As described above, since the rotor 10 of Embodiment 1 is provided with an anodized coating having a Vickers hardness of 300 [Hv] or more, the coating applied to the magnesium alloy does not cause cracks or decrease in the strength of the surface layer. As a result, the rotor 10 of the disclosed technology can achieve a weight reduction of more than 20% compared with a conventional titanium alloy rotor.

Possibility of industrial use

The rotor of the disclosed technology can be applied to rotating equipment and has industrial applicability.

Explanation of reference signs

10 rotor, 11 iron core, 12 magnet, 13 shaft, 14 rotating central part, 15 rotating peripheral part, 16 fastening member, 20 stator, 30 outer frame, 40 bearing, 100 rotating equipment.

Claims (4)

1. A rotor is characterized in that,

the rotor includes:

the rotary center part is formed by magnesium alloy, is formed with an anodic oxide film and is subjected to chemical synthesis treatment; and

the rotating peripheral part is composed of titanium alloy or CFRP,

the rotation center portion and the rotation peripheral portion are of a fitting size,

the anodic oxide film has a Vickers hardness of 300[ Hv ] or more.

2. The rotor of claim 1, wherein the rotor comprises a plurality of rotor blades,

the chemical synthesis treatment forms a fluorinated surface layer on the magnesium alloy.

3. A method for producing a rotor is characterized in that,

the production method of the rotor comprises the following steps:

forming an anodic oxide film having a Vickers hardness of 300[ Hv ] or more in a rotation center portion composed of a magnesium alloy;

a step of performing chemical synthesis treatment on the rotation center portion on which the anodic oxide film is formed; and

and a step of fitting the rotation center portion to the rotation peripheral portion.

4. A rotary apparatus, characterized in that,

the rotating device is provided with: a rotor according to claim 1 or 2, or a rotor based on the production method of claim 3.