A: Development trend: (1) Equipment serialization and complete set. (2) Large equipment. (3) Integrated process or semi-continuous mining process. The main factors affecting the open pit mining process are: (1) Natural conditions of the deposit. Including: mineral rock properties, ore body burial conditions and burial depth, topography, geographical location, climate, hydrology and engineering geology. (2) Equipment to choose from. The following factors are included: 1 The equipment of each link should be matched in type and specification as much as possible; 2 The complete set of equipment should be selected, and the equipment type should be uniform. The equipment type in the same link should be as uniform as possible; 3 equipment parts supply and maintenance are reliable; 4 auxiliary equipment should be matched with main equipment; 5 personnel training is guaranteed; 6 equipment source is reliable. (3) The equipment can meet the production scale and the requirements for ore quality (selection and mining). (4) consider the sources of funding the purchase of equipment. (5) Consider environmental protection requirements. (6) Consider the economic and technical conditions around the mining area. Selection principle: (1) Technically feasible. (2) Economically reasonable. (3) Meet the mining scale and ore quality requirements.
Sand Casting, also known as sand molded casting, is a metal casting process characterized by using sand as Sand casting, The term "sand casting" can also refer to an object produced via the sand casting process. Sand castings are produced in specialized factories called foundries. Over 70% of all metal castings are produced via a sand casting process.
Sand casting is relatively cheap and sufficiently refractory even for steel foundry use. In addition to the sand, a suitable bonding agent (usually clay) is mixed or occurs with the sand. The mixture is moistened, typically with water, but sometimes with other substances, to develop strength and plasticity of the clay and to make the aggregate suitable for molding. The sand is typically contained in a system of frames or mold boxes known as a flask. The mold cavities and gate system are created by compacting the sand around models, or patterns, or carved directly into the sand.
Basic process
There are six steps in this process:
1.Place a pattern in sand to create a mold.
2.Incorporate the pattern and sand in a gating system.
3.Remove the pattern.
4.Fill the mold cavity with molten metal.
5.Allow the metal to cool.
6.Break away the sand mold and remove the casting.
Sand Casting
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