These problems of Dalian castings mainly include the lack of specialized logistics management organization in production logistics, unreasonable production logistics layout planning, low efficiency of production material handling, etc. In view of these outstanding problems, corresponding improvement measures are designed respectively. Firstly, aiming at the confusion of production logistics management in the casting workshop of H company, a special production logistics management center is established, and the corresponding responsibilities are designed; In view of the unreasonable production logistics layout planning,
Combined with the characteristics of manufacturing types, the design is improved from the systematic production layout planning; Aiming at the problem of material handling, advanced handling tools are introduced to improve the handling efficiency. During the cooling and solidification process of castings, due to the liquid shrinkage and solidification shrinkage of alloys, holes often appear in the solidification place of castings. Holes with large volume and relatively concentrated volume are called shrinkage cavities; Small and scattered holes are called shrinkage cavities.
The shape of the shrinkage cavity is irregular, the surface is rough, and the developed dendrite terminals can be seen, so it can be clearly distinguished from the pores. The hot cracking tendency of stainless steel precision casting flat ingot is high, and the temperature of stainless steel precision casting is relatively low, generally 680~735 ℃ stainless steel parts casting. It is relatively convenient to remove dust by artificial cool sand. Its commonly used dry sand is generally washed quartz sand, sea sand, and pearl sand.
For the dry section of alloy steel castings, due to the high temperature during operation, the central lubrication station is used to transfer lubricating oil to various bearings for lubrication and heat dissipation. The grease lubrication points at the wet end are often inspected and injected and replaced manually on a regular basis. Therefore, the lubrication system often refers to the central lubrication station of the dry section, as well as all transmission and oil supply pipelines and oil injection devices.
Low pressure casting, a casting method in which liquid metal is filled into a mold and solidified into a casting under the action of low pressure gas. Low pressure casting was mainly used in the production of aluminum alloy castings at the beginning, and then it was further expanded to produce copper castings, iron castings and steel castings with high melting point. Generally, the casting fillet radius is 0.2-0.4 times of the wall thickness, which can be found out from relevant standards. The fillet radius of the same casting shall be the same or close as possible.
