Piston for internal combustion engine and method of manufacturing the same
An internal combustion engine, piston technology, applied in the direction of engine components, machines/engines, pistons, etc., can solve the debris manageability (manageability damage, unsatisfactory surface roughness of the oil ring groove portion, insufficient machinability) Satisfaction, etc., to achieve the effect of excellent chip manageability, small surface roughness, excellent wear resistance
Inactive Publication Date: 2006-11-29
RESONAC HOLDINGS CORPORATION
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Problems solved by technology
However, although the forging material is suitable for forging a thin, long part such as a skirt, the machinability of the material is not satisfactory due to the finer metallographic structure of the forging material
Chip manageability is compromised, resulting in lower productivity, for example because chips are produced in a continuous form rather than in pieces during machining
In addition, the surface roughness of the oil ring groove portion of a final piston product after machining is not satisfactory
Method used
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example 1 and 2
[0087] Alloy 1, shown in Table 1, has a solidus temperature of -549°C by figure 2 The shown apparatus was subjected to unidirectional solidification casting to thereby form an ingot (outer diameter: 77 mm, thickness: 30 mm) used as a forging material (Example 1). For Alloy 1 shown in Table 1 with a solidus temperature of -528°C by figure 2 The shown apparatus performs unidirectional solidification casting to thereby form an ingot (outer diameter: 110 mm, thickness: 30 mm) used as a forging material (Example 2). Casting conditions are shown in Table 2. In each of examples 1 and 2, in image 3 K-type thermocouples were placed at the positions of the molds shown to measure the cooling rate of the ingot during solidification.
[0088] Each of the above forged materials was homogenized at 490°C for 8 hours, and then used Figure 5 The shown forging device forges a piston preform by hot forging. The forging material is placed in the forging die of the forging equipment so that ...
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Abstract
A forged piston for an internal combustion engine formed from an aluminum alloy containing silicon in an amount of 6 to 25 mass%, includes an oil ring groove section (12) and a skirt section (13). The ratio (A / B) of the average size (A) of eutection silicon grains contained in the oil ring groove section to the average size (B) of eutection silicon grains contained in the frontal end portion (18) of the skirt section is at least 1.5. The average size (A) is at least 4 [micro]m. With the configuration such that the average size (B) is small and that the average size (A) is large, the skirt section exhibits excellent forgeability and the oil ring groove section exhibits reliable mechanical workability and improved wear resistance.
Description
[0001] Cross References to Related Applications [0002] This application claims the filing date benefit of Provisional Application No. 60 / 308,110, filed July 30, 2001, under 35 U.S.C. §119(e)(1). technical field [0003] The invention relates to a forged piston for an internal combustion engine made of an aluminum-silicon alloy and to a method for producing the piston. Background technique [0004] Typically, pistons for internal combustion engines are produced by metal (permanent) mold casting. First, molten aluminum alloy is poured into a mold to thereby mold the aluminum into a piston preform. The formed preform is then subjected to the desired heat treatment, eg, intentional aging, and then the desired machining to produce a finished product. [0005] Recently, in some cases, pistons for internal combustion engines are produced by forging. Continuous casting of molten aluminum-silicon alloy to thereby form a billet for extrusion; heat treatment (homogenization treatm...
Claims
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IPC IPC(8): F02F3/00F16J1/01B22D21/04B22D27/04C22C21/02C22F1/00C22F1/043
Inventor 柳本茂福田政志佐藤正广
Owner RESONAC HOLDINGS CORPORATION