摆线铣开槽加工切削力分析

Cutting force investigation of trochoidal milling in slotting

针对摆线铣开槽加工工艺,建立了从刀具接触工件到完成切削整个过程刀具与工件的接触角模型.在接触角模型的基础上利用微元法建立了立铣刀切削力模型,开展切削实验获取了切削力系数,并通过对比预测值与实测值,验证了切削力模型的正确性.最后对比分析了摆线铣和行切法在效率、主轴转速、切深相同的条件下,加工相同尺寸的槽,刀具的受力情况.结果表明:采用摆线铣加工方式,刀具和工件的平均接触角以及刀具所受的切削力都要明显小于行切法.所以使用摆线铣方式,加工过程更为稳定,刀具寿命更长,从而可以采用更高的进给和更大的切深来提高加工效率.

This paper focuses on the trochoidal milling in slotting,and establishes the contact angle model between the tool and the workpiece,which includes a complete process from the tool con⁃tacting the workpiece to the completion of the cutting.On the basis of the contact angle model,an end mill cutting force model is established using the micro-element method.Then,cutting experi⁃ments are carried out to obtain the cutting force coefficient,and the correctness of the cutting force model is verified by comparing the measured value with the predicted value.Finally,under the same efficiency,spindle speed,and depth of cut,the forces on tool when cutting slots of the same size using the choidal milling and row cutting methods are analyzes and compared.The results show that with the trochoidal milling method,the average contact angle between the tool and the work⁃piece and the cutting force on the tool are significantly smaller than those of the row cutting method.Therefore,using the trochoidal milling method,the machining process will be more stable and the tool life will be will be longer,therefore improving the machining efficiency by a higher feed and a larger depth of cut.