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KR-20260063591-A - Al-Si EUTECTIC ALLOY COMPOSITION FOR SCROLL MEMBER, SCROLL MEMBER FOR SCROLL COMPRESSOR USING THE SAME AND METHOD FOR MANUFACTURING SCROLL MEMBERS

KR20260063591AKR 20260063591 AKR20260063591 AKR 20260063591AKR-20260063591-A

Abstract

The present invention relates to an Al-Si eutectic alloy suitable for use in a scroll member of a scroll compressor, a scroll member using the same, and a method for manufacturing the scroll member.

Inventors

  • 임규철
  • 강승구
  • 장재식
  • 강민식
  • 추인길
  • 박정우
  • 윤경기

Assignees

  • 동서페더럴모굴 주식회사
  • 유성기업 주식회사

Dates

Publication Date
20260507
Application Date
20241030

Claims (7)

  1. Al-Si eutectic alloy for a scroll member comprising 11.0 to 13.0 wt% Si, 3.0 to 3.8 wt% Cu, 0.5 to 1.0 wt% Mg, 2.0 to 2.7 wt% Ni and the remainder Al.
  2. In paragraph 1, The above aluminum alloy for a scroll member is an Al-Si eutectic alloy for a scroll member further comprising Fe in an amount greater than 0 wt% and less than or equal to 0.5 wt%, Mn in an amount greater than 0 wt% and less than or equal to 0.2 wt%, Ti in an amount of 0 to 0.2 wt%, and Zn in an amount of 0 to 0.2 wt%.
  3. In paragraph 2, The above aluminum alloy for the scroll member is an Al-Si eutectic alloy for the scroll member having a weight ratio of Mn to Fe of 0.2 or more.
  4. A scroll member for a scroll compressor comprising an Al-Si eutectic alloy for a scroll member according to claim 1.
  5. In paragraph 4, The above scroll member is a scroll member for a scroll compressor selected from the group consisting of linear scrolls and fixed scrolls.
  6. a) A step of preparing a molten metal by mixing and melting raw materials for manufacturing an Al-Si process alloy for scroll members; b) a step of adding a grain refinement agent to the molten metal; c) A step of adding a primary Si refinement agent to the molten metal; d) A step of degassing the above molten metal; e) a step of casting by injecting the molten metal from step d) into a mold for a scroll member; f) Step of removing the cast product; g) a step of water-cooling the extracted casting; and h) A step of post-processing the cooled casting to complete it as a scroll member; A method for manufacturing a scroll member for a scroll compressor comprising
  7. In paragraph 6, The above step h) h-1) Step of cutting the riser of the cooled casting; h-2) A step of heat-treating the casting obtained from step h-1) at a temperature of 400 to 500℃ for 0.5 to 2 hours; h-3) a step of heat-treating the casting obtained from step h-2) at a temperature of 200 to 250°C for 3 to 6 hours; and h-4) A step of completing a scroll member by machining the casting obtained from the above h-3) step; A method for manufacturing a scroll member for a scroll compressor comprising

Description

Al-Si EUTECTIC ALLOY COMPOSITION FOR SCROLL MEMBER, SCROLL MEMBER FOR SCROLL COMPRESSOR USING THE SAME AND METHOD FOR MANUFACTURING SCROLL MEMBERS The present invention relates to an aluminum alloy composition for a scroll member having characteristics such as dimensional stability, low thermal expansion, and wear resistance suitable for use as a scroll member of a scroll-type compressor, a scroll member for a scroll compressor manufactured using the same, and a method for manufacturing the scroll member. Vehicles that use a motor as a driving force, such as electric vehicles or hydrogen fuel cell vehicles, have characteristics such as requiring quieter auxiliary parts compared to internal combustion engine-driven vehicles and possessing individual power performance, as they have smaller inherent noise sources. Scroll-type compressors, which are quiet and highly efficient, are adopted as electric compressors for automotive air conditioning, and a conventional scroll compressor consists of a fixed scroll, a slewing scroll, a motor shaft, a motor, a case, etc. In a scroll-type compressor, two or more compression chambers are formed in which the volumes formed by the wrap portions and flange portions of the fixed scroll and the rotating scroll change continuously by the mutual rotational movement of the fixed scroll and the rotating scroll, and the volume of these compression chambers decreases as it approaches the center of the scroll so that the compressed gas can be discharged to the outside through the discharge port located at the center of the fixed scroll after the gas is compressed. The fixed scroll is largely composed of a flange and a lap section having an involute shape perpendicular to it, and the slewing scroll is largely composed of a boss section (assembled with the motor shaft) formed perpendicular to the flange and a lap section having an involute shape formed perpendicular to the opposite flange; in order to provide smooth air conditioning during compressor operation, there must be no gas leakage, wear, or damage to the scroll. Therefore, fixed scrolls and slewing scrolls must maintain precise dimensions at all times, before, after, and during operation. To this end, fixed scrolls and slewing scrolls are required to possess characteristics such as low thermal expansion to counteract scroll expansion caused by heat generated from gas compression and mechanical friction, wear resistance to prevent wear losses due to mutual friction, machinability suitable for precision machining, and lightweighting to reduce the moment of inertia generated during operation and improve vehicle mounting capabilities. U.S. Patent No. 9133844 relates to a scroll member, a method of manufacturing the same, a compression mechanism, and a scroll compressor, wherein the manufacturing method comprises a casting step and a cutting step, wherein an iron casting including a helical portion is formed in the casting step, and the iron casting obtained in the casting step is cut in the cutting step to obtain the final shape of the scroll member. The iron casting may include a fixed portion having a first axial thickness and an outer portion having a second axial thickness greater than the first axial thickness prior to the cutting step. The dimensions of a designated portion of the helical portion may be larger before the cutting step is performed than after the cutting step is performed, and the designated portion is preferably positioned toward the outer periphery of the helical portion. Korean Registered Patent No. 1807799 relates to an Al-Si cast alloy and a method for manufacturing the same, and discloses a technology for reducing manufacturing costs comprising the steps of: providing an Al-Si cast alloy having an Fe content in the range of 0.2 wt% to 1.0 wt% and containing a β phase (Al 5 FeSi) in the matrix; mechanically processing the Al-Si cast alloy to refine the β phase (Al 5 FeSi); and aging the mechanically processed Al-Si cast alloy at a temperature range of 150°C to 200°C. However, the above technologies do not disclose a new aluminum-based alloy composition, a scroll member using the same, or a method for manufacturing the same, which improves the dimensional stability of a scroll member including a fixed scroll and a rotating scroll, possesses low thermal expansion, has excellent physical properties such as wear resistance, and simplifies the manufacturing process to improve manufacturing efficiency and reduce manufacturing costs. The present invention is intended to solve these problems. After conducting numerous experiments and research, the inventors of the present invention have completed the present invention, which resolves the aforementioned problems. Figure 1 is a schematic diagram showing examples of a rotating scroll and a stationary scroll, which are components of a scroll compressor, and their respective shapes. Figure 2 is a photograph showing the damaged state of a scroll according to a comparat