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粘砂,又称结砂、吃砂。是常见的铸造缺陷之一。粘砂不严重时一般不至于使铸件报废,但却给生产带来许多麻烦。 1.增大了铸件的清理工作量。 2.铸件加工面上的粘砂,增加了切削加工工时,加速刀具磨损,严重时能打坏刀具。 3.铸件内腔与润滑面连接的非加工面上的粘砂,如空气锤缸体后缸、油压机五孔内腔等,当存有残留砂粒时,整台机器在使用过程中,由于砂粒的脱落,将会带来严重后果。 4.非加工面上的粘砂,影响了铸件与整台机器的外观。 5.粘砂较严重时将使铸件报废。粘砂是高温金属液与型芯表面相互作用的结果,是一个复杂的物理与物理化学过程,其形成机理至今还没有弄清楚。不过我们在生产实践中可以看
Sticky sand, also known as sand, eat sand. It is one of the common casting defects. When the sticky sand is not serious, castings are generally not scrapped but bring a lot of trouble to the production. 1. Increased the amount of cleaning work castings. 2. Casting process surface of the sticky sand, an increase of cutting working hours, accelerated tool wear and tear, can severely damage the tool. 3. Casting cavity and lubrication surface connected to the non-processing surface of the sticky sand, such as air cylinder cylinder, hydraulic five-hole cavity, etc., when there is residual sand, the entire machine in use, the sand Off, will have serious consequences. 4. Non-processing surface of the sticky sand, affecting the castings and the appearance of the entire machine. 5 sticky sand will make the casting more serious scrapped. Sticky sand is the result of the interaction between the hot metal and the core surface. It is a complex physical and physical chemical process, and its formation mechanism has not yet been clarified. But we can see in production practice