Stainless Steel Casting To Avoid Contamination
When we use stainless steel castings, we often appear when the anodic oxide film stained with white spots. The reason for this situation is because the stainless steel castings loose, high porosity, containing a variety of metal and non-metallic impurities, so the quality of the oxide film is often more difficult.
So to avoid the pollution of stainless steel casting method:
1, high voltage and high current density impact method. That is, in the early stages of oxidation of stainless steel castings on the use of high-voltage shock, so that the part has been oxidized by electric shock and then connected into pieces.
2, surface grinding method. This method is to fill the aluminum grinding has been filled with the oxide part of the gap, so that the resulting gap together, as the role of the bridge.
3, the surface shot peening method. This method is to use a round hammer beating the gap, by tapping to close, can be achieved into the film for the purpose. We have to choose according to the degree of contamination of stainless steel casting corresponding to the corresponding method
Two types of sand used in the treatment of stainless steel castings
Baozhu sand is artificial sand, the performance is better, more durable, but the price is four to five times higher than ordinary sand, one-time investment costs will be relatively large, but long-term use because of his low loss rate, regardless of the cost or Casting quality is better than ordinary casting sand.
Stainless steel casting production is the key part of the sand treatment part, as the name suggests is to deal with dry sand, choose these sand itself is less dust, the effect will naturally be good, especially the pearl sand, and even if there is no sand processing, artificial sand Dust, then it is relatively more convenient point. Stainless steel castings commonly used dry sand is generally washed quartz sand, sea sand, and sapphire sand, the size is generally 20 to 40 mesh, mainly based on its degree of fire resistance, that is, silicon content can not be less than 95%, then from him Of the permeability of the choice, the first two kinds of sand for the general casting, more economical.
Stainless steel castings appear sand and trachoma solution
In addition to improper sand, if the equipment used before there is not completely clean, or in the casting process of stainless steel casting, due to the pouring of the temperature is too high, molten iron scouring the wall of the sand, there will be sand and The problem of trachoma. At first, due to the requirements of this area is not strict, does not affect the use, so all manufacturers do not pay attention to such a problem, some manufacturers in order to alleviate this problem, usually is to use paint to solve, but because of this process More difficult, so it will lead to casting out of the castings will exist sand and trachoma phenomenon, greatly reducing the quality of the casting.
In order to solve the castings appear sand and trachoma problem? After continuous research found that, as long as the use of special casting paint for the inner wall of the clean-up, you can greatly reduce the sand and trachoma problems, but also to improve the yield of castings also have a great effect.