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SGCI(Spheroidal Graphite Cast Iron), CVGCI(CV Graphite Cast Iron) and FGCI(Flake Graphite Cast Iron) having different contents of Mn(0.25%∼0.85%) and Ni(0.3%∼1.2%) were produced, respectively. The thermal expansion and thermal conductivity of the cast iron were investigated in the temperature range of 50℃∼300℃. As the graphite nodularity of the cast iron increases, thermal expansion coefficient increases, thermal conductivity and electrical conductivity to thermal conductivity ratio decrease. The thermal expansion coefficient of the cast iron increases with increasing Mn content and decreases with increasing Ni content. The thermal conductivity of the cast iron decreases with increasing Mn and Ni contents.
Hypoeutectic Al-9%Si and Al-4.5%Cu alloys were casted in four kinds of ingot case materials with different thermal conductivity, and the solidification phenomenon was investigated by measuring shrinkage cavity, centerline feeding resistance, cooling rate of melt, temperature gradient of ingot cases and interdendritic arm spacings. The ingot case materials studied were flake graphite cast iron(FGCI), CV graphite cast iron(CVGCI), spheroidal graphite cast iron(SGCI) and FGCI/CVGCI/SGCI from the bottom side of an in got case. An ingot case composed of FGC/CVGCI/SGCI showed less shrinkage cavity and centerline feeding resistance than those of either FGCI, or CVGCI or SGCI. The cooling rate of melt was a bout 1.5℃/sec faster at the sideline than at the centerline of the melt. The secondary dendritic arm spacing was measured to be inversely proportional to the cooling rate of the melt.
Purpose: This paper compares the effectiveness of typical selective assembly criteria and suggests the most promising one. Based on the result of a computer simulation, the key issues of selective assembly are examined and the best criterion is recommended from the effectiveness perspective. Methods: Using JAVA program, production of ten thousand units for each pair of components are simulated for selective assembly of the two types. And the number of mismatching and the fraction nonconforming for each criterion are determined. Results: The best match criterion appeared to be most promising from the perspectives of both mismatching and nonconforming problems. Its effectiveness appears to be also good even when the precision of one component is different from that of the other. Conclusion: For designing an optimal method for selective assembly, the best match criterion is recommendable as the base criterion.
The purpose of metal working(1) laboratories of a technical high school curriculum is to prepare the student efficient work performance in the field of foundry engineering. In order to achieve this purpose, a teaching guide book should be written by the teacher in actual charge of the course under consideration, needs of local industry, practice -equipment of schools and students pre-condition. In this study, the process of development of metal working (1) laboratory is investigated and a teaching guide book for melting operation of cast iron was developed. When a teaching guide book is developed, the following items are necessary to be taken into account: 1) Setting up practice-plan, job analysis of the section should be done and the operations plan to be developed step by step. 2) Student arrangement for each job should be planned. 3) The teacher should provides the subject-library with work-standard and require prelimihome work about each job. 4) The teacher should prepare audio-visual aid to as to understand the relationship between theory and practice. 5) A teaching guide book includes ⅰ) preliminary home-work relative to each operation, ⅱ) the point of observation and recording form, ⅲ) the point of discussion after practice, ⅳ) the evaluation standard.
Bainite spheroidal graphite cast iron specimens of 0∼0.054wt % residual Mg were casted into a green sand mold, 25 mm thickness Y-block. The microstuctures of the castings were studied for mechanical properties and abrasion characteristics. The results obtained from this study are summerized as follows: 1) Under the present expermental conditions, the relation between the abrasion speed and the abraded amount are; 0.5m/sec for 1^st abrasive wear and 2.38m/sec for 2^nd abrasive wear. 2) Increasing the residual Mg, the first abrasion speed for 2nd abrasive wear moved to the low abrasion speed. 3) The maximum amount of abraded material during 2^nd abrasive wear decreases with the increasing residual Mg content, and moves to the high abrasion speed as the residual Mg is increased over 0.042 wt %. 4) The amount of abraded materials increases with the decreasing residual Mg at abrasion speed 2.38 m/sec and with the increasing residual Mg at abrasion speed 0.62∼1.14 m/sec. 5) Increasing the abrasion speed, abrasion mechanisms are as follows; ⓐ 1^st abrasive wear ⓑ 1^st corrosive wear ⓒ 2^nd abrasive wear ⓓ 2^nd corrosive wear. But, Under the present expermental condition the adhesive wear mechanism didn't appear.