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工作垫板是机械压力机中的一个较大的厚铸件。以J23-100吨压力机为例,铸件尺寸为1080×710×116,重量660公斤,材质HT20-40,硬度HB170～240;加工后,上下平面不得有气孔、砂眼、疏松等铸造缺陷(见图1)。该铸件的壁厚大,加工面要求严格。我们采用粘土砂干型配以冷铁铸造,由于缺乏浇注厚大件的经验,铸件经常出现气孔、砂眼、夹砂、料硬等铸造缺陷,废品率为20～40％,有时甚至达到60％,严重影响了生产任务的完成。我们先后采用过如图2、图3所示的四种工艺方案。第一种:底面放冷铁压边浇口,第二种:底面放冷铁浇口经过
The work pad is a large thick cast in a mechanical press. Take J23-100 ton press as an example, the casting size is 1080 × 710 × 116, the weight is 660kg, the material is HT20-40 and the hardness is HB170 ~ 240. After processing, there should be no casting defects such as pores, figure 1). The wall thickness of the castings, demanding processing surface. Due to the lack of experience in casting heavy pieces, castings often have casting defects such as blowholes, blisters, sand, and hard materials. The rejection rate is 20-40%, sometimes even 60% , Seriously affected the completion of production tasks. We have adopted as shown in Figure 2, Figure 4 shows the four kinds of process options. The first: the bottom of the cold iron pressure side gate, the second: the bottom of the chilled iron gate