JP2009293094A5

JP2009293094A5 -

Info

Publication number: JP2009293094A5
Application number: JP2008149454A
Authority: JP
Filing date: 2008-06-06
Publication date: 2011-10-27
Anticipated expiration: 2028-06-06

Description

本発明は、高シリコン−アルミニウム合金からなる基材の少なくとも一部の表面が陽極酸化皮膜によって被覆された金属部品を製造するための製造方法に関するものである。 The present invention relates to a manufacturing method for manufacturing a metal part in which at least a part of the surface of a substrate made of a high silicon-aluminum alloy is coated with an anodized film.

本発明の目的は、高シリコン−アルミニウム合金からなる基材の表面を、表面平滑性に優れるため例えばロータの軸端等の相手部材に対する攻撃性を有しない上、耐摩耗性にも優れた陽極酸化皮膜で被覆して、前記各特性に優れた金属部品を製造するための製造方法を提供することにある。 An object of the present invention, high silicon - the surface of an aluminum alloy or Ranaru substrate, on no aggressiveness against a mating member such as a shaft end for excellent surface smoothness example rotor, excellent wear resistance Another object of the present invention is to provide a production method for producing a metal part excellent in each of the above characteristics by coating with an anodic oxide film.

したがって本発明は、高シリコン−アルミニウム合金からなる基材の少なくとも一部の表面を陽極酸化処理して、前記表面が陽極酸化皮膜で被覆された金属部品を製造するための製造方法であって、前記基材を陽極として、陰極と共に電解液に浸漬した状態で、
(1) 前記両極間に与える電流の電流密度を０Ａ／ｄｍ^２から毎分０．３５Ａ／ｄｍ^２以下の割合で増加させる第一工程と、
(2) 電流密度が所定値に達した時点以降、前記所定の電流密度を維持しながら陽極酸化処理を続ける第二工程と、
を経て、前記表面を陽極酸化皮膜で被覆することを特徴とするものである（請求項１）。 Therefore, the present invention is a manufacturing method for manufacturing a metal part in which at least a part of the surface of a substrate made of a high silicon-aluminum alloy is anodized, and the surface is coated with an anodized film, With the base material as an anode, immersed in an electrolyte together with the cathode,
(1) a first step of increasing the current density of the current applied between the ^two electrodes from 0 A / dm ^{2 at} a rate of 0.35 A / dm ² or less per minute;
(2) a second step of continuing the anodizing process while maintaining the predetermined current density after the current density reaches a predetermined value;
Then, the surface is coated with an anodized film (claim 1).

筐体９は、前記各部を有する形状に複数の分割体によって構成されている。すなわち筐体９は、分割面１０で分割可能なフロントハウジング（分割体）１１およびリヤハウジング（分割体）１を有している。フロントハウジング１１は、分割面１０から凹入させて作動室６を備えている。フロントハウジング１１とリヤハウジング１は、分割面１０に設けたシール１２によってシールされている。フロントハウジング１１とリヤハウジング１とは、フロントハウジング１１に設けたネジ孔１３に、リヤハウジング１に設けた通孔１４を通してボルト１５をねじ込むことで互いに固定されている。 The housing 9 is constituted by a plurality of divided bodies in a shape having the above-described parts. That is, the housing 9 includes a front housing (divided body) 11 and a rear housing (divided body) 1 that can be divided by the dividing surface 10. The front housing 11 has a working chamber 6 by recessed from split surface 10. The front housing 11 and the rear housing 1 are sealed by a seal 12 provided on the dividing surface 10. The front housing 11 and the rear housing 1 are fixed to each other by screwing a bolt 15 into a screw hole 13 provided in the front housing 11 through a through hole 14 provided in the rear housing 1.

リヤハウジング１は、本発明の金属部品の製造方法によって製造される。すなわち、リヤハウジング１とフロントハウジング１１は、オイルポンプ２を軽量化すると共に、特にオイルポンプの高圧化（例えば８ＭＰａ→１５ＭＰａ）に対応して歪みを防止するべく強度を高めるために、例えばシリコンを１〜２５質量％、特に１０〜２０質量％程度の割合で含む高シリコン−アルミニウム合金によって形成される。またロータ３の軸端、すなわちロータ本体３６の側面、およびベーン３８の側縁に対向し、前記両部が摺接されるリヤハウジング１の対向面２５は、その耐摩耗性を高めるべく図示しない陽極酸化皮膜によって被覆される。 The rear housing 1 is manufactured by the metal component manufacturing method of the present invention. That is, the rear housing 1 and the front housing 11, together with the weight of the oil pump 2, in particular for increasing the strength in order to prevent distortion in response to the high pressure of the oil pump (e.g. 8 MPa → 15 MPa), for example, a silicon It is formed of a high silicon-aluminum alloy containing 1 to 25% by mass, particularly about 10 to 20% by mass. Further, the opposed surface 25 of the rear housing 1 facing the shaft end of the rotor 3, that is, the side surface of the rotor main body 36 and the side edge of the vane 38 and in which the both portions are slidably contacted is not shown in order to improve the wear resistance. It is covered with an anodized film.

本発明の金属部品の製造方法は、以上で説明した図の例におけるオイルポンプ２のリヤハウジング１の製造には限定されず、高シリコン−アルミニウム合金の少なくとも一部の表面が陽極酸化皮膜で被覆される種々の金属部品の製造方法に適用することができる。その際、陽極酸化皮膜の表面の十点平均粗さや厚み、硬さ等は、その金属部品において求められる好適な範囲に設定することができる。その他、本発明の要旨を逸脱しない範囲で種々の変更を施すことができる。 The manufacturing method of the metal part of the present invention is not limited to the manufacturing of the rear housing 1 of the oil pump 2 in the example of the drawings described above, and at least a part of the surface of the high silicon-aluminum alloy is coated with an anodized film. The present invention can be applied to various metal part manufacturing methods. At that time, the ten-point average roughness, thickness, hardness, etc. of the surface of the anodized film can be set within a suitable range required for the metal part. In addition, various changes can be made without departing from the scope of the present invention.

Claims

A manufacturing method for manufacturing a metal part in which at least a part of a surface of a substrate made of a high silicon-aluminum alloy is anodized, and the surface is coated with an anodized film, the substrate being an anode In the state immersed in the electrolyte together with the cathode,
(1) a first step of increasing the current density of the current applied between the ^two electrodes from 0 A / dm ^{2 at} a rate of 0.35 A / dm ² or less per minute;
(2) a second step of continuing the anodizing process while maintaining the predetermined current density after the current density reaches a predetermined value;
Then, the surface is coated with an anodized film, and the method for producing a metal part is characterized in that:

The method of manufacturing a metal part according to claim 1, wherein in the first step, the current density is increased at a rate of 0.15 A / dm ² or more per minute.

In the second step, current density 0.8 A / dm ² or more, a manufacturing method of a metal part according to claim 1 or 2 is maintained at a predetermined value of 1.2A / dm ² or less.

A metal part is disposed in a shape having a working chamber, a suction passage and a discharge passage communicating with the working chamber, and a plurality of divided bodies, and is rotatably disposed around the shaft in the working chamber. A rear housing of an oil pump having a rotor for sucking oil through a suction passage and rotating through the discharge passage as it rotates, facing the working chamber of the divided body constituting the housing and facing the shaft end of the rotor The method of manufacturing a metal part according to any one of claims 1 to 3, wherein at least a surface of the rear housing facing the shaft end of the rotor is covered with an anodized film.