第11-12次课Numerical control of Production Equipment生产设备的数字化控制.pptVIP

Instead, the machine tool axes are referenced to the location of the fixture by using a target point or set of target points on the work or fixture. 取而代之的是，通过使用工件或者夹具上一个目标点或多个目标点来进行机床坐标轴和夹具的定位。 7)Cutter length compensation. This is similar to the preceding feature but applies to tool length and diameter. 刀具长度补偿：这类似于前面的特征，但是应用于刀具长度和直径。 In older-style controls, the cutter dimensions had to be set very precisely in order to agree with the tool path defined in the part program. 在旧式控制中，刀具尺寸必须被设定的非常精确，以满足工件程序中设定的刀具路径。 Other methods for ensuring accurate tool path definition have been incorporated into newer CNC controls. 确保刀具路径精确度的其他方法已经被应用到新式的CNC控制中。 One method involves manually entering the actual tool dimensions into the MCU. 一种方法是向MCU中手工输入实际的刀具尺寸。 These actual dimensions may differ from those originally programmed. Compensations are then automatically made in the computed tool path. 这些实际刀具尺寸可能与原始程序中的不一致。进而，在计算的刀具路径中进行自动补偿。 Another more recent innovation is use a tool length sensor built into the machine. 另外一种必威体育精装版的方法是使用一个安装在机床上和刀具长度相等的传感器。 In this method, the cutter is mounted in the spindle and brought into contact with the sensor to measure its length. This measured value is then used to correct the programmed tool path. 在这个方法中，刀具安装在旋转轴上并带着和传感器接触来测量其长度。测量值接下来被用于修正编制好的刀具路径。 8)Diagnostics. Many modern CNC machines possess an on-line diagnostics capability which monitors certain aspects of the machine tool and MUC operation to detect malfunctions or signs of impending malfunctions. 诊断。许多现代化的CNC设备都具有在线诊断功能，用来监视机床某些特定方面和MCU运行过程，以检测失灵和即将失灵的信号。 When a malfunctions is detected, or measurements indicate that a breakdown is about to occur, a message is displayed on the controllers CRT monitor. 当一个失灵被检测到，或者测量值表明故障即将发生，信息机会显示在控制器的CRT显示器上。 Depending on the seriousness of the malfunction, the system can be stopped or maintenance can be stopped or maintenance can be scheduled for a nonproduction shift. 根据故障的严重程度，系统可以停止或者维修可以停止，或者维修可以被编排到非生产部分。 Another use of the diag