久碰久摸久看视频在线观看,欧美精品久久久久久久自慰,亚洲AV无码一区二区三区国产,狠狠躁天天躁中文字幕_秦皇岛揭潘影视文化发展有限公司

The advantages of cast iron and cast steel structures are good manufacturability, easy to obtain complex shapes of inner and outer contours, and have good strength, rigidity, vibration resistance, stability and reliability. The disadvantage is that the cycle is long, the energy consumption is high, and the single-piece manufacturing cost is high.

Cast aluminum is a kind of pure aluminum or aluminum alloy ingot prepared according to the standard composition ratio, and then artificially heated to turn it into an aluminum alloy liquid or molten state, and then through a professional mold or corresponding process, the aluminum liquid or molten aluminum A process in which the alloy is poured into the cavity and cooled to form an aluminum part of the required shape. Taking into account factors such as economy and functionality, the current casting material generally uses cast aluminum material ZL104, which is conducive to reducing weight. Adding a large amount of lead to the casting greatly reduces the rigidity of the bottom plate and the surface quality will also be damaged, so aluminum alloy material It must be calibrated and tested in accordance with the elements specified by the national standard, so pay attention to when purchasing.

When designing the cast aluminum bottom plate structure, attention should be paid to the layout of the reinforcement ribs and the reasonable allocation of related dimensions. The ribs greater than 10mm/less than 20mm are more suitable. Too thick ribs may cause loose structure and lower strength; when the ribs are too thin, they may easily produce a whole Deformed. Process control is very important when aluminum alloy casting, especially the treatment of the working surface. The working surface should be placed at the bottom of the sand mold, and cold iron should be placed in the sand pit to obtain a dense internal structure (local cooling will speed up the formation of the structure accelerate). The design of the pouring riser needs to consider the metal flow direction, angle, gate size and other factors. The pouring riser should also pay attention to the feeding requirements while considering the metal flow direction.