Sand casting is one of the most common methods for producing castings in many industries - machine tool industry, the automotive industry, and much more. This method is widely used in single, serial and mass production.
Sand Casting Technology
Sand casting technology is not difficult. This method of casting is used for the manufacture of castings and parts of gray iron, low carbon steel alloys. Sometimes, sand casting is used to process non-ferrous metals - aluminum, copper, etc.
Choosing such casting in Sand Technologist at Sand Casting Manufacturers must understand that the quality of the finished parts will be quite low. This is primarily due to the fact that the use of such technology cannot guarantee that foreign inclusions will not fall into the liquid alloy.
During sand casting, gas formation occurs very rapidly; especially this process manifests itself during casting into wet molds. It is permissible to use this form of casting to obtain parts with complex geometry. But a number of restrictions on the receipt of such blanks impose the fact that the removal of the finished casting is associated with certain difficulties.
Sand casting can produce blanks up to hundreds of tons in weight. Thus, beds for metal-cutting equipment, body parts, etc. are produced. Meanwhile, the accuracy of the workpieces produced is below 14 kvalitet, in addition, shells and foreign inclusions can be found on the surface of cast parts. That is why those surfaces that will be in contact with other parts are always machined.
Foundry Models
Models for this form of sand casting must withstand quite a lot of pressure that occurs when the flask is filled with casting mold with earth. That is why for the manufacture of molds used metal, solid wood. All materials that are permissible to use for the manufacture of molds are allowed to combine.
That is, they can be assembled on threaded joints, glue, etc. To remove pores on wooden parts of models, they are carefully treated with abrasive sandpaper.
Then, it is coated with varnish. In the Sand Casting Manufacturers, it is necessary to take into account the fact that it is necessary to withstand the angles of inclination of vertical planes. The presence of these corners will subsequently facilitate removal of the finished casting from the mold.
One of the key factors determining the quality of the casting performance is the properties of the sand (earth) used to produce the casting tooling. Practice shows that the finer and cleaner the sand, the higher the quality of the casting will be.
Sand Casting Assembly
After the casting tool has been produced, it is prepared for pouring the melt. Working surfaces must be lubricated with a special compound that facilitates the free removal of the finished casting. After the preparation of the working surfaces, the installation of the casting rods is carried out.