Abstract
This article discusses the issues concerning the quality of casting surface with a small unit weight manufactured on the Disamatic automatic casting lines in a flaskless mould with a vertical parting line. The research was conducted in manufacturing conditions in one of the casting facilities in the country. The identification of casting defects for a monthly manufacturing cycle was made and agreed that the main causes of scrap casting are defects on the raw surface: lumps of moulding sand which after removal form cavities and draws as well as defects of gas origin such as blowholes. There are also defects of form namely short runs. In the later part of the work, the research results of the properties of moulding sand were presented and casting defects were selected the occurrence of which is connected with the quality of moulding sands.
Highlights
Moisture content test results were close to the optimal value, approx. 3% the worrying result is themoisture content of the return mass, which is too low
Coal dust added to the moulding sands ensures the smoothness of the casting surface and prevents scorching of the mass into the casting
The requirements for coal dust are included in the PN-91 / H-11008 and present the following contents: water
Summary
Moisture content test results were close to the optimal value, approx. 3% the worrying result is themoisture content of the return mass, which is too low. Blowhole lumps of moulding sand which after removal form cavities Shows the averaged contents of active clay and coal dust in the moulding sand in the subsequent production days of Detal.
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