过去车间中对型砂的使用极混乱,当时型砂是由造型工自配自用,单凭手和眼判别型砂是否适用,加上当时采用的原砂不符合铸件的要求;因此,有许多因型砂质量不好而引起的废品无从查起,也有许多老师傅配的砂虽能保证质量,但由于没有记录,这些经验也不能推广。 In the past, the use of sand in the workshop was very chaotic. At that time, the sand was self-made by the model workers. Whether the sand was discriminated by hand or by eye was appropriate. In addition, the original sand used at that time did not meet the requirements of the castings. Therefore, Bad waste can not be detected, but many of the chefs can guarantee the quality of sand, but because of the lack of records, these experiences can not be promoted.