At present, CAD system is mainly used to design car parts, and the design of parts is completed through reverse engineering and various experiments. CAM software is used to process the messy appearance of mold. However, how to ensure the accuracy of design and processing depends on NC machining, In the following, the author analyzes the relationship between the application of five axis machining center in die processing and the quality of car die.

1对深腔模具的加工

1. Processing of deep cavity mold

轿车模具制作的进程傍边，加工深腔模具时如运用五轴加工，要想完结有必要加长刀柄和刀具，但是运用五轴加工加工比较深与比较陡的型腔时，要想给模具加工发明较好的工艺条件能够经过工件或主轴头的附加回转和摇摆，能够使刀具长度得到适当地缩短，然后杜绝刀具同刀杆以及型腔壁之间发作碰撞现象的发作，削减加工时刀具的抖动与破损，刀具的运用寿命得到延伸，模具的外表质量和加工功率也大大进步。

The process of car mold making is close to the side. If the five axis machining center is used to process the deep cavity mold, it is necessary to lengthen the tool handle and tool to finish. However, when the five axis machining center is used to process the deep and steep cavity, it is necessary to invent better process conditions for mold processing, which can pass through the additional rotation and swing of the workpiece or spindle head, It can appropriately shorten the length of the tool, prevent the occurrence of collision between the tool, the tool bar and the cavity wall, reduce the vibration and damage of the tool during processing, extend the service life of the tool, and greatly improve the appearance quality and processing power of the die.

2模具侧壁的加工

2 processing of die side wall

对模具侧壁的加工，运用五轴加工刀具长度要比侧壁深度大，也是由侧壁深度来决议刀具长度的，若增加刀具的长度，其强度会显着下降，若刀具长度高于3倍径让刀现象便会发作，工件的质量将难以确保。如运用五轴加工对模具的侧壁加工，能运用主轴或是工件的摇摆，使刀具与模具侧壁呈现出笔直的状况，铣模具侧壁时能够运用平面铣刀，这样能够进步工件质量并延伸刀具的运用寿命。

For the processing of the side wall of the die, the tool length of the five axis machining center is larger than the side wall depth, and the tool length is also determined by the side wall depth. If the tool length is increased, its strength will decrease significantly. If the tool length is higher than 3 times the diameter, the tool yield phenomenon will occur, and the quality of the workpiece will be difficult to ensure. If the five axis machining center is used to process the side wall of the die, the swing of the spindle or workpiece can be used to make the tool and the side wall of the die appear straight. When milling the side wall of the die, the plane milling cutter can be used, which can improve the quality of the workpiece and extend the service life of the tool.

3模具较平的曲面加工

3. Machining of flat curved surface of die

对模具较平的曲面加工时，五轴加工需用球刀精铣，获取好的外表质量，而这种情况下需求增加刀路，但球头刀刀具的旋转线速简直为零，在模具加工时刀具损害的程度较大，刀具的运用寿命会缩短，而模具外表质量也会变差。运用五轴加工加工较平的曲面，能够在工件上把刀具上成必定的视点再进行工件的加工，这样能够增加工件与球头刀间的相对线速，不但能够使刀具的运用寿命得到进步，工件外表质量也会大幅进步。

When machining the flat surface of the die, the five axis machining center needs ball cutter finish milling to obtain good appearance quality. In this case, the tool path needs to be increased, but the central rotation linear speed of the ball head cutter is almost zero. During die machining, the degree of tool damage is large, the service life of the cutter will be shortened, and the appearance quality of the die will become worse. Using the five axis machining center to process a flat surface can make the tool into a certain point of view on the workpiece and then process the workpiece. In this way, the relative linear speed between the workpiece and the ball head cutter can be increased, which can not only improve the service life of the tool, but also greatly improve the appearance quality of the workpiece.

4对模具无方向变化直线的铣削

4 milling of straight lines without direction change of die

要想铣削没有方向变化的一条直线，只需刀尖划条直线便可，若是方向需求改动，刀尖划条曲线便可，刀具刀尖方向被改动，这时再想要直线，就要给这条曲线以有必要的补偿，运用五轴加工这点是极其重要的。控制系统若未考虑到刀具的长度，刀具是环绕轴来旋转的，刀具的刀尖不能够固定，极有可能会移出当时的工作方位，但是在五轴加工的系统中具有五轴控制功能，在加工模具的操作中，运用五轴控制系统尽管刀具的方向被改动，但其刀尖的方位是能够坚持不变的，这个进程中xyz轴有必要的补偿运动一起也被自动核算进去，此时加工精度显着进步。

If you want to mill a straight line without direction change, you only need to draw a straight line at the tool tip. If the direction needs to be changed, you can draw a curve at the tool tip, and the tool tip direction is changed. At this time, if you want a straight line again, you need to make necessary compensation for this curve. It is extremely important to use the five axis machining center. If the control system does not consider the length of the tool, the tool rotates around the axis center, and the tool tip cannot be fixed, it is very likely to move out of the current working direction. However, the five axis control function is provided in the system of the five axis machining center. In the operation of the machining die, the five axis control system is used, although the direction of the tool is changed, However, the orientation of the tool tip can remain unchanged. In this process, the necessary compensation motion of XYZ axis is also automatically calculated. At this time, the machining accuracy is significantly improved.