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精密铸造浇注面的确定方法
[作者:aowl] [日期:19-04-01] [浏览次数:] [来源:]

浇注时铸件在铸型中所处的位置影响精密铸件质量•●、尺寸精度•●、造型工艺难度。 The position of castings in casting in casting is influenced by the quality of precision casting, precision of dimension and difficulty of molding process. 浇注位置的选择原则: Selection principle of casting position: 1.精密铸件的重要加工面或主要加工面朝下或位于侧面:浇注时,金属液中得气体•●、熔渣及铸型中得砂粒会上浮,有可能使铸件的上部出现气孔•●、夹渣•●、砂眼等缺陷,而铸件下部出现缺陷的可能性下,组织较致密。 1. The importance of precision casting machining surface or main facing, or in profile: casting, metal liquid to gas, slag and cast in sand will rise, may make the upper part of the casting defects such as porosity, slag inclusion, sand holes, and the possibility of casting defects under, the organization is relatively dense. a.机床床身的浇注位置,应将导轨面朝下,以保证该重要工作面的质量。其圆周面的质量要求较高,采用立浇方案,可使圆周面处于侧面,保证质量均匀一致。 A. The placement position of the lathe bed shall be facing down to ensure the quality of the important work surface. The quality of the circumference surface is higher, and the vertical pouring scheme can be used to make the circumference of the circle side and ensure uniform quality. 2.精密铸件的大平面朝下或倾斜浇注:由于浇注时炽热的金属液对铸型的上部有强烈的热辐射,引起顶面砂型膨胀拱起甚至开裂,使大平面出现夹砂•●、砂眼等缺陷。大平面朝下或采用倾斜浇注的方法可避免大平面的生产铸造缺陷。 2. Precision casting of large plane down or tilt pouring: because when pouring hot metal on the top of the mold has a strong thermal radiation, top surface caused by sand arch and even crack expansion, the big flat sand inclusion, sand holes and other defects. The method of large plane facing down or inclined pouring can avoid the production casting defect of large plane. 3.精密铸件的薄壁朝下•●、侧立或倾斜:为防止铸件的薄壁部位产生冷隔•●、浇不到缺陷,应将面积较大的薄壁置于铸件的下部,或使其处于侧壁或倾斜位置。 3. Precision casting of thin wall, side vertical or inclined down: to prevent thin wall part of the casting cold-lap, casting defects, the thin wall with larger area should be placed in the bottom of the casting, or make it in the wall or tilted position. 4.精密铸件的厚大部分应放在顶部或在分型面的侧面主要目的是便于在厚处安放冒口进行补缩。 4. The thickness of the precision castings should be placed on the top or on the side of the fractal side to facilitate the filling of the riser at the thickness.

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