The presented work is aimed to deal with the influence of changes in the value of negative (relative) pressure maintained in the die cavity of pressure die casting machine on the surface quality of pressure castings. The examinations were held by means of the modified Vertacast pressure die casting machine equipped with a vacuum system. Castings were produced for the parameters selected on the basis of previous experiments, i.e. for the plunger velocity in the second stage of injection at the level of 4 m/s, the pouring temperature of the alloy equal to 640°C, and the die temperature of 150°C. The examinations were carried on for three selected values of negative gauge pressure: - 0.03, - 0.05, and - 0.07 MPa. The quality of casting was evaluated by comparing the results of the surface roughness measurements performed for randomly selected castings. The surface roughness was measured by means of Hommel Tester T1000. After a series of measurements it was found that the smoothest surface is exhibited by castings produced at negative gauge pressure value of - 0.07 MPa.
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机译：提出的工作旨在解决在压铸机的模腔中保持的负（相对）压力值变化对压铸件表面质量的影响。通过配备真空系统的改进型Vertacast压铸机进行检查。根据先前实验选择的参数生产铸件，例如，第二阶段注射速度为4 m / s，合金的浇铸温度等于640°C和模具温度150℃。对负表压的三个选定值进行了检查：-0.03，-0.05和-0.07 MPa。通过比较随机选择的铸件的表面粗糙度测量结果来评估铸件的质量。表面粗糙度通过Hommel Tester T1000测量。经过一系列测量，发现在负表压值为-0.07 MPa的情况下生产的铸件表现出最光滑的表面。
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