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我厂生产的BJO_2-51-6(5.5KW)机座,是一个关键铸件,废品率较高(在11～28％之间波动),严重地影响了生产计划的完成。经过改进工艺后,废品率大大下降。一、5.5KW电机座的特点和要求: 1.铸件外形尺寸316×324mm,壁厚不均匀,最厚24mm,最薄3mm。材质HT25-47。 2.形状较复杂,技术要求高。要经8kg/cm~2的水压试验,保压1分钟。机加工表面,特别是防爆面,不允许有肉眼可见的孔洞缺陷。非加工表面要求光滑无砂眼、气孔等缺陷。二、改进前的铸造工艺(见图1)
The BJO_2-51-6 (5.5KW) frame produced by our factory is a key casting with a high reject rate (fluctuating between 11% and 28%), which seriously affected the completion of the production plan. After the improvement process, the rejection rate dropped significantly. A, 5.5KW Motor Block characteristics and requirements: 1. Casting dimensions 316 × 324mm, uneven wall thickness, the thickest 24mm, the thinnest 3mm. Material HT25-47. 2 more complex shape, high technical requirements. To 8kg / cm ~ 2 hydrostatic test, holding pressure 1 minute. Machined surfaces, especially explosion-proof surfaces, do not allow visible hole defects. Non-machined surface requires smooth, no blisters, pores and other defects. Second, to improve the casting process before (see Figure 1)