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 Wysłany: Wto 2:46, 11 Sty 2011 Temat postu: ugg prezzo Pressure crystallization process in the |
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Pressure crystallization process in the aluminum alloy of Investment Casting
Pieces. Crystal store located Fen 1 Schematic diagram of the pressure casting Casting in sprue is often the role of both riser, straight gate diameter Pat-standardized, and its size is 0 ~ 50m [I1. R3 poured through the sprue of the casting for the feeding. The size of the general flow r3 a more simple and convenient method of heat to determine the pitch ratio of r3 in diameter by pouring hot pitch circle diameter and the relationship between D KD d based on production experience from a general to take K = 0.4 ~ 0 .9, will be able to meet the requirements. But t using pressure crystallization process, the casting of hot section and other parts often appear at the settlement or the concentration of shrinkage fins, these defects tend to increase with the applied pressure and severe. I plant to two pieces of Tao, for example, plus the relationship between pressure and casting defects in Table 2. Table 2 plus the relationship between pressure and casting defect concentration of shrinkage of the parts of chassis are in the middle or lower part of the casting, shell, including reduced depression focus on the root of the gate. Be seen from Table 2,[link widoczny dla zalogowanych], with the external pressure increases, the degree of the two corresponding casting serious defects, resulting in scrapped castings. WU Jin Zhang,[link widoczny dla zalogowanych], Beijing (100039) 26 aluminum alloy castings in general there are different levels of porosity - pinhole. Casting pinholes exist in accordance with the number and diameter were divided into fifty levels. Four pinhole seriously deteriorated following the mechanical casting resin t should be scrapped. Casting pinhole (continued on page 25) cast soil. ,, 4 Si Indian population slightly stream size. Can easily cancel one phase or two-phase capacity. (6) in the upper, middle, and lower part of the sensor, the set of three thermocouples, test the furnace temperature in the ministries, as a part of the iron crucible temperature exceeds the Curie point, through the temperature control device, automatic compensation capacitance, so that each part of the sensor close to the pure resistance load operation (7) back to the way the stove is set in operation the two operations. Its operation, the total signal power from the switch on the furnace the first piles. So. Operation of the signal power from the regulator,[link widoczny dla zalogowanych], but also to the commissioning and maintenance of great convenience and safety. 5 foreign-frequency coreless induction furnace melting furnace of the main properties of magnesium alloys compared (Table 2) Table 2 Frequency Coreless Induction domestic magnesium melting furnace seen from Table 2 Performance comparison: a look who developed iron crucible phase-frequency coreless induction melting furnace of the indicators of magnesium than the original BBC in] 976 b. of the products manufactured The three-phase induction furnace is made of magnesium alloy melting, asked for the requirements of moments. Were in their tests, melting time is only 20min, then baked. The three-phase line current to meet the basic balance, make the iron hot crucible of local deformation. Improve the life of the crucible, the crucible has been their age ≥ 500 times} On the other hand the power network and workshop equipment can be shared with other devices do not need to solve the equilibrium, the cost can be reduced. 6 Conclusion Our company is supporting the production of Santana gearbox shell, shell covered magnesium alloy die castings,[link widoczny dla zalogowanych], metal components demanding. Above this frequency furnace to meet the requirements. Were made by the developed three-phase iron crucible frequency coreless induction furnace and stove manufactured BBC. Iron crucible geometry outside. None of the other common. In the development, the practical calculation is based on electromagnetic theory. Electrical parameters calculation, and the debugging is very close. Root smoothly. We believe that on this basis. Can design capacity of other non-core three-phase iron-frequency crucible induction furnace. (Editor: Yuan Zhenguo) (Continued from page 26) level and the decline of the gas content is shown in Table 3 3 aluminum castings, the pinhole porosity level and the number of the relationship between the diameter can be seen from Table 3, the following rough conclusions If the pinhole within the level of casting from 4 to 2 standard. The sum should be reduced stomatal diameter of about 90,8; if the casting from the original pinhole 3 to phase 2 standards, the diameter of the pores should be reduced by the sum of about 76.5. That, when the casting mold under pressure. With the increase of applied pressure, the casting pinhole level increased. Dense castings, and casting a corresponding reduction of the volume of gas. So. Solidification, this partial reduction of the volume of liquid metal must be sufficient to supplement in order to obtain dense castings, it will lead to reduced fin orange or depression, the fin holes and other casting defects. Therefore, the usual design of gating system no longer applies. Must fully consider the ways of feeding. Students in my shell casting plant for the fall, the original design of the gating system is a straight gate and cross the gate within the gate by the heat of the casting at the feeding section, the use of pressure during crystallization process. The gate at the root of the phenomenon of severe depression reduction, improved pouring system is set up, including the gate at the top of the riser volume is large enough, with a full complement of fin capacity, plus when the pressure reaches 0.5MP chu. The gate will not appear at the root of the phenomenon of reduced depression, has been casting a dense,[link widoczny dla zalogowanych], pinhole up to 2 level. (Editor: Zhang Zhenbin) 25
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