Category:heavy

Question:
who knows - how the vacuum casting going on? Can say a specific point?

Answer:
vacuum sealed in a vacuum casting technology is based on the modeling technology developed, the technology can be used to produce very complex shapes, the thickness of very thin castings, so that no casting shrinkage and the shrinkage phenomenon, At present, more highly advanced and very promising technology in the aviation field, with the use of computer-assisted simulation technology to predict the production of casting defects can greatly save time, reduce production costs, increase casting productivity.

vacuum casting can be divided into the following:
1 Vacuum Suction
will be placed in closed shell container, out-type shell of air, so that the negative pressure-type shell to a certain extent, leading to inhalation of liquid metal cavities . When the casting solidified within the runner, the removal of negative pressure, so that sprue metal solidified inside a solvent flow back to the pool. The advantage is to improve the alloy liquid filling capacity, suction casting castings minimum wall thickness of up to O. 2mm area of up to 300mm2, while reducing pores, slag and other defects. Applicable to small-scale production of thin and fine precision castings, cast steel (including stainless steel) pieces of particularly appropriate where.
2 Vacuum low pressure die casting
low vacuum pressure casting method is the process of filling the vacuum on the mold, filling packing exhausted so that a constant pressure in the crystallization of casting solidification, casting full feeding, thus casting organizations compact, the mechanical performance. More at home and abroad will be applied to Al, Mg alloy castings precision forming.
3 Vacuum Pressure Vacuum Pressure Casting Process Casting
mainly by controlling the cast and the degree of vacuum inside the crucible and the mold and the metal surface of the differential pressure to control the degree of filling velocity, so that metal filling lakes ares benefit. Especially suitable for production of complex thin-walled castings.
4 Vacuum Casting Vacuum Casting
able to produce sophisticated, complex, close to the final shape of the product components, may from time to process the direct use of little or no processing, is suitable for large-volume industrial production, domestic and foreign applications for future the prospects for a very wide range of casting method, its heat and mass transfer of theoretical research and simulation software development are important.
vacuum casting technology not only for metal materials, but also widely used in plastics, rubber, resins and other industries.

Answer:
vacuum casting, is to make the mold to maintain the vacuum, and then injected into molds where molten iron, aluminum and water, copper, water, etc. This will enable the liquid to prevent oxidation of the metal casting and forming of the slab there is no bubble trachoma and other defects.

Answer:
in the gold industry in general have such a

Chinese:谁能告诉我 ？？？

类别: 重工业

问题:
有谁知道－－真空浇注是怎么回事？能说的具体点吗？

回答:
真空浇注技术是在真空密封造型技术基础上发展起来的，该技术可用于生产形状非常复杂、厚度非常薄的铸件，使铸件无缩孔及缩松现象，是目前较先进又非常具有发展前途的技术，在航空领域，配合使用计算机技术进行辅助模拟，预测铸造缺陷的产生，能大幅度节约时间，降低生产费用，提高铸件的生产效率。

真空浇注可分为以下几种：
1 真空吸铸
将型壳置于密闭的容器内，抽出型壳内空气，使型壳内造成一定的负压，导致金属液吸入型腔。当铸件的内浇道凝固后，去除负压，令直浇道内未凝固的金属液流回溶池中。其优点是提高了合金液的充型能力，吸铸铸件的最小壁厚可达O．2mm的面积可达300mm2，同时减少气孔、夹渣等缺陷。适用于生产薄而精细的小型精铸件，铸钢(含不锈钢)件尤宜。
2 真空低压铸造
真空低压铸造法是在加压充型的过程中对铸型抽真空，充型完后保压使铸件在恒定压力下结晶凝固，铸件得到充分补缩，因而铸件组织致密，力学性能提高。目前国内外多将其应用于Al，Mg合金铸件的精密成形。
3 真空差压铸造
真空差压铸造工艺主要是通过控制铸型和坩埚内的真空度及铸型与金属液面的差压度来控制充型速度，从而使金属湖顷利充型。尤适于生产复杂薄壁铸件。
4 真空熔模精密铸造
真空熔模精密铸造能生产精密、复杂、接近于零件{zh1}形状的产品，可不加工或很少加工就直接使用，适合于大批量工业生产，是今后国内外应用前景非常广泛的铸造方法，其热质传递理论研究和模拟计算软件开发都有重要意义。
真空浇注技术不仅用于金属材料上，还广泛应用于塑胶，橡胶，树脂等行业。

回答:
真空浇注，就是使模具保持真空，然后往模具里注入铁水、铝水、铜水等等，这样使浇注的金属液体避免氧化和成型的铸坯中没有气泡、砂眼等缺陷。

回答:
在金子行业中一般有这些的