A pressing cake-rubbing method was proposed for geometric feature of rough surface,and the construction and application of press rubbing device were introduced.With this method,the physical properties and rubbing accuracy of 5 kinds of ultra-light clay with different preset times were tested.The results show that optional rubbing accuracy can be obtained when the clay is opened and preset for about 2h.The plastic settlement value is more suitable than the moisture content to evaluate the clay physical properties for the interface roughness rubbing accuracy control.When the plastic settlement value is not less than 1.5 mm,the average error of the corresponding point is less than 0.3 mm.The rebound deformation value has little effect on rubbing accuracy.At the same time,measures such as increasing pressing pressure,second press and knead and attaching rigid backboard were taken to study the influence of rubbing accuracy.The results show that the pressing pressure should not be less than 50N,second press and knead can improve rubbing accuracy.When using freshly opened clay,high accuracy immediate demoulding can be realized by using rigid backboard,and the average error of corresponding points is less than 0.12mm.
concrete surfaceroughnesspressing cake-rubbing methodultra-light clayaverage error of corresponding point
维普
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