ugg stivali Furan resin sand high temperature yiel

Furan resin sand high temperature yield method of assessment and improvement measures

Line) and dynamic load conditions, the stress-strain curve. Because the sample is thinner, easier to heat through; and the use of single-sided heating, and thus closer to actual production conditions. The instrument uses a high precision while sensors and computer data acquisition and processing system, the sampling time for the 001S, can accurately measure changes in output and displacement. I trapped a high-temperature compressive strength of different sand l l2 one plus a cut-off system, pressure sensor din j3-displacement sensor; 4 - Sample 5, a heating furnace; 6 - Change into the device; 7 - 8, a base temperature controller} Phoenix printing system volume and temperature performance of the sand testing apparatus 2 Received Date :2000-1023 Hui ashamed by I: beam, as the military (1965 a), M t help the North people. Engineer, Master. t-based \It reflects the nature of sand as follows: (1) large negative deformation, indicating a large thermal expansion of the sand. When the mold in the case of bound,[link widoczny dla zalogowanych], static expansion of capacity, will increase the resistance to solidification shrinkage. (2) is large deformation,[link widoczny dla zalogowanych], indicating that the apparent softening of sand and large plastic deformation. That is, the greater the amount of fracture variant,[link widoczny dla zalogowanych], the yield of the sand the better the resistance to solidification shrinkage is also smaller. (3) high temperature lasting time,[link widoczny dla zalogowanych], the specimen started to break off from the heat experienced by time. High temperature lasting for a long time, indicating that the thermal decomposition of binder slow, slow sand strength loss. When the solidification cooling sand still in high intensity state, the casting is also prone to hot cracking. (4) the smaller the bending strength of high temperature and high temperature strength loss sooner, the better tendency to reduce the hot tearing of castings. The results shown in Figure 3,4 shows that the yield of the three sand in the following decreasing order; sodium silicate sand of a polypropylene resin, a furan resin sand sand. This conclusion is the actual casting and production results, and proved that the yield of testing and evaluation method is feasible. 3 to improve the yield of furan resin sand measures to reduce the resin by adding 3.1 volume of resin added volume on the sand of the subordination of some significant impact. Figure 5 shows that addition of less resin, reducing the overall strength of sand, not only improved the yield of the sand, but also by the curing agent can reduce the sulfur content with a person, which helps to reduce the hot tearing tendency of steel castings . Time per ≤ 0) _ 【leek-shaped coral m) (a) high temperature strain time curve (b) high temperature stress-strain curves of Figure 5 with different amount of resin added impact on the yield of 3.2 by adding appendages Figure 6 shows Different Additives on the sand high temperature resistance of concessions. The results showed that the three additions to furan resin sand can improve the yield of high-temperature, appendages PsK the best. Table 1 shows the feeding appendages of furosemide room temperature tensile strength of resin sand. Three kinds of attachments are less strong effect on the sand, the role of technical powder less strong than the obvious, PSK strong role in attachment by small, high-temperature yield the best. Appendages has been able to improve the yield of furan resin sand, one sand down the overall strength of the second is attachment occurs at a lower temperature of soft (a) high temperature strain time curve (b) high temperature stress-strain curves Circle 6 Different Additives on the amount of yield of furan resin sand of l-o. 8 cover bad technique powder -2.1 ,3-o. Qu, animal husbandry, SK, 4 of a cabinet without additional add-Yun Xiang a different meal for furosemide ■ Tree chu tensile strength of ordinary sand with 3.3 shell, shell core shell structure mentioned here, shell core, does not mean phenolic resin coated sand - hot shell method,[link widoczny dla zalogowanych], but to furan resin sand core made of hollow shell structure, casting dredge emptied the local approach is also taken. Figure 7 shows the shell of furan resin sand, shell core structure diagram. Shell-like structure by type (core), not only can save sand, and to ensure that the metal heat acting on the sand, the resin film decomposition, after solidification mold (core) of the residual strength decreases, reducing the ability to hinder the shrinkage by The reduction of hot tearing tendency of the casting. Figure 7, the amount of sand to improve the yield of zinc type, a hollow core diagram of a sand Mao; 2 - good local neutral sand casting F4 F3-5 to a sand sugar demand will slow down China's analysis of Cypriot copper and aluminum were considered. As economic growth and infrastructure investment and human reason, in the medium to long term China will continue to maintain its important role in the importing country base. This year, China has emerged in the base metals consumption growth in the two deposited. 】 {『Of Cyprus believes that this year China is expected to increase imports of aluminum, is expected before the end of Bute, it is possible more than 550,000 tons (300,000 tons in 1999.) Buried in 2001 imports may put about '5 tons. (Lu from the \
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