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How to determine the casting surface of precision casting

Edit:Xiangyang Liqiang Machinery Co., Ltd.UpDate:2020-05-21

During pouring, the common parts of castings in metal mold casting endanger the quality of precision castings, the precision of specifications, and the difficulty coefficient of modeling design and processing technology.

Selection criteria for pouring parts:

1. The key production processing surface or key production processing surface of precision castings is facing down or located on the side: When pouring, the vapor in the metal material liquid, slag and sand in the metal mold will increase, which may cause the casting Defects such as air vents, weld bumps, sand holes, etc. appear on the upper end of the casting, while the lower part of the casting has a higher probability of defects.

a. For the pouring part of the CNC lathe body, the slide rail should face down to ensure the quality of the key tunneling face. The quality requirement of the circle is relatively high, and the vertical pouring plan is selected, so that the circle top is on the side, and the quality and quantity are evenly balanced.

2. The large plan view of the precision casting is poured downward or obliquely: Because the hot metal material liquid has obvious radiant heat to the upper end of the metal mold during pouring, the sand mold on the top of the wall swells, arches and even cracks, making the large plan view appear Shortcomings such as sand and sand holes. Downward or oblique pouring of the large plan can prevent welding defects in the production of the large plan.

3. The thick wall of the precision casting is facing downwards, standing on its side or skewed: In order to avoid the disadvantages of cold isolation and failure to pour due to the thick wall position of the casting, the thick wall with a large total area should be placed under the casting, or make it On the outer wall or skewed area.

4. Most of the thickness of precision castings should be placed on the top or on the side of the clinical diagnosis surface. The key purpose is to facilitate the placement of gates in thick areas for feeding.

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