The purpose of this paper is to investigate the influences on mechanical properties of two-stroke cycle motor pistons manufactured by casting, conventional forging and powder forging, through the comparison of characteristics, merits and disadvantages of each forming technology. For each forming tec...
The purpose of this paper is to investigate the influences on mechanical properties of two-stroke cycle motor pistons manufactured by casting, conventional forging and powder forging, through the comparison of characteristics, merits and disadvantages of each forming technology. For each forming technology, the optimal process parameters were determined through the experiments for several conditions, and microstructure, hardness, tensile strength and elongation of pistons are compared and analyzed. In conventional forging process, material temperature was $460^{\circ}C$ and the die temperature was $210^{\circ}C$ for the Al 4032. The optimal condition was found as solution treatment under $520^{\circ}C$ for 5 hours, quenching with $23^{\circ}C$ water, and aging under $190^{\circ}C$ for 5 hours. In powder forging process, the proper composition of material was determined and optimal sintering conditions were examined. From the experiment, 1.5% of Si contents on the total weight, $580^{\circ}C$ of sintering temperature, and 25 minutes of sintering time were determined as the optimal process condition. For the optimal condition, the pistons had 76.4~78.3 [HRB] of hardness, and 500 [MPa] of tensile strength after T6 heat treatment.
The purpose of this paper is to investigate the influences on mechanical properties of two-stroke cycle motor pistons manufactured by casting, conventional forging and powder forging, through the comparison of characteristics, merits and disadvantages of each forming technology. For each forming technology, the optimal process parameters were determined through the experiments for several conditions, and microstructure, hardness, tensile strength and elongation of pistons are compared and analyzed. In conventional forging process, material temperature was $460^{\circ}C$ and the die temperature was $210^{\circ}C$ for the Al 4032. The optimal condition was found as solution treatment under $520^{\circ}C$ for 5 hours, quenching with $23^{\circ}C$ water, and aging under $190^{\circ}C$ for 5 hours. In powder forging process, the proper composition of material was determined and optimal sintering conditions were examined. From the experiment, 1.5% of Si contents on the total weight, $580^{\circ}C$ of sintering temperature, and 25 minutes of sintering time were determined as the optimal process condition. For the optimal condition, the pistons had 76.4~78.3 [HRB] of hardness, and 500 [MPa] of tensile strength after T6 heat treatment.
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가설 설정
(2) Powder forging can improve tensile strength about 2 times more than that of casting piston. For elongation, however, conventional forging is the most effective forming technology.
In Fig. 3 (c), pores existed in sintered preform are crashed and the structure become minute and dense. Eutectic around grain boundary and precipitation hardened structures are observed.
제안 방법
Before the forging process, the experiment for visco-plasticity was performed with laminated black and white plasticine to investigate the workability and internal material flow. As lubricant, talc powder was used to separate material from die easily.
The purpose of this paper is to investigate the influences on mechanical properties of two-stroke cycle motor pistons manufactured by casting, conventional forging and powder forging, through the comparison of characteristics, merits and disadvantages of each forming technology. For each forming technology, the optimal process parameters were determined through the experiments for several conditions, and microstructure, hardness, tensile strength and elongation of pistons are compared and analyzed. To verity the theoretical result, we have carried o experiments using model material and FE-simulations using DEFORM/3D.
The FEM simulation by DEFORM/3D, one of mostly used software in analysis of metal forming, was carried out. The relative density test[KS standard D 0033] and ring compression test were carried out in order to estimate the relative density and friction coefficient of the preform.
The purpose of this paper is to investigate the influences on mechanical properties of two-stroke cycle motor pistons manufactured by casting, conventional forging and powder forging, through the comparison of characteristics, merits and disadvantages of each forming technology. For each forming technology, the optimal process parameters were determined through the experiments for several conditions, and microstructure, hardness, tensile strength and elongation of pistons are compared and analyzed.
The FEM simulation by DEFORM/3D, one of mostly used software in analysis of metal forming, was carried out. The relative density test[KS standard D 0033] and ring compression test were carried out in order to estimate the relative density and friction coefficient of the preform. The relative density of 0.
In the present study, pistons were manufactured by conventional forging and powder forging technology. To investigate the influences on mechanical properties by each piston forming technologies, microstructure, harness, tensile strength and elongation of the pistons casted, conventionally forged, and powder forged were compared. By the experiment for visio-plasticity with laminated black and white plasticine, the workability and internal material flow during conventional forging were investigated.
대상 데이터
The majority of powder used in experiments is Alumix-123(Al4.5Cu-0.5Mg-0.7Si) manufactured from ECKART, in Germany. The average size of powder is 200mesh and theoretical density is 2.
이론/모형
Casting piston used in the experiment was manufactured by gravity casting technology. This has been commercialized in industries.
참고문헌 (11)
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