Numerical Control of Machining Parts from Aluminum Alloys with Sticking Minimization

Резюме

To implement a lot of technological processes in the manufacturing of aircraft parts from aluminum alloys, it is necessary to move the tool at a high speed. High requirements for accuracy and manufacturing quality aircraft parts are provided with application of CNC systems with adaptive control algorithms, in which due the mutual influence of the process parameters provided by the parameters of quality and accuracy. Among a number of factors adversely affecting the quality of high speed machining of aluminum alloys in the paper questions influence Look-ahead system distortion predetermined (set up) cutting parameters on the formation conditions of the sticking material to the tool. The paper deals with high-speed machining without the use of a cooling lubricant (coolant). The paper provides a qualitative description of the heat generation variation in the cutting zone. It is concluded that it is necessary to cutting speed variation when feed variating. An experimental investigation of the cutting parameters for the appearance of the effect of the processed material sticking on the tool for alloy 1933 has been carried out. Areas of an unfavorable (negative) combination of parameters leading to the sticking of the material to the tool have been identified. The method of cutting modes adaptation to contour feed rate variation on curvilinear areas of a processing trajectory is proposed. The analysis of variation in cutting parameters with the partial deceleration of the spindle simultaneously with the deceleration of feed when moving along the path is carried out. The possibility of excluding the sticking of the processed material to the tool when variation the rotation speed by 20…30% is shown. The proposed method is implemented in the CNC system and used for manufacturing of “Antonov” company airplane parts.