空间曲面电火花线切割CAD/CAM系统

为解决高速走丝电火花线切割机床加工空间曲面的难题,实现大锥度空间复杂曲面零件的加工,以空间曲面数学模型和数控模型为基础,开发了一种计算机辅助设计/计算机辅助制造(Computer aided design/computer aided manufacturing,CAD/CAM)系统.其硬件系统以研制的数控转摆摆工作台为核心装置,并与现有高速走丝电火花线切割机床结合,组成空间曲面线切割加工系统.其软件系统可以根据上下导线的参数方程进行分析计算,建立空间曲面的三维模型,自动生成NC加工代码,进行加工仿真和空间曲面零件的加工.利用本系统进行典型空间复杂曲面零件的加工试验,结果表明加工结果与仿真结果基本相似.此外,还分析数控模型以及回摆间隙角对加工误差的影响.这些工作为解决高速走丝电火花线切割加工空间曲面的难题打下基础.

CAD/CAM SYSTEM FOR SPATIAL CURVED SURFACE IN WIRE CUT ELECTRONIC DISCHARGE MACHINING

In order to solve the difficult problems of machining spatial curved surface parts in wire cut electronic discharge machining(WEDM), to get high tapered spatial complicated curved surface parts, an CAD/CAM system based on the mathematical models and numerical control(NC) models of spatial surface are developed. The NC turning and two sways table is the key part of system hardware, which can be com- posed of the spatial surface machining system with the normal WEDM with high speed (WEDM-HS). The system software can establish the 3D model by analyzing and calculating the equation of the upper and lower leads, and get the NC machin- ing code automatically according to the model, then test it by machining simulation, and machining. Machining experiment of machining typical spatial complicated curved surface parts have done and the machining samples are like the simulation ones basically. Besides, the influence of the machining error by the NC model and the clearance angle of the sway back are analyzed. All these works provide an effective approach for us to resolve the problems of cutting spatial curved surface parts by WEDM-HS.