Machine Tool Term Explanation Summary (3)
CNC auxiliary function: M function - the function used to command the auxiliary operation of the machine, that is, the command to control the on and off of the machine tool and its auxiliary devices. Such as opening and stopping the cooling pump; the spindle is reversing, stopping; the program is finished, etc. It consists of two digits after M, and there are 100 kinds (M00～M99). There are modal (continued) instructions and non-modal instructions. Previous page next page
CNC tool management function: Manages tool geometry and tool life. The machining center should have this function. The tool geometry refers to the radius and length of the tool. These parameters are used for the tool compensation function. The tool life refers to the time life. When the time life of a tool expires, the CNC system will prompt the user to replace it. In addition, the CNC system has a T function, ie tool number management function, which is used to identify the tool in the magazine and automatically select the machining tool.
CNC compensation function: tool radius and length compensation function--This function can realize the program according to the contour of the part to control the tool center trajectory, and the tool radius or length of the tool when the tool is worn or replaced (tool radius change) Make the corresponding compensation. This function is implemented by the G command. Transmission chain error, backlash error compensation function--pitch error compensation, the pitch error and backlash can be measured in advance, and then input into the corresponding storage unit of the CNC device as required. The random error generated by the external interference of the CNC can be modernized. Advanced artificial intelligence, expert systems and other methods to build models and implement intelligent compensation, this is the direction of CNC technology development. Intelligent compensation function - such as the error caused by thermal deformation, the device will automatically compensate in the corresponding place.
CNC man-machine dialogue function: equipped with monochrome or color CRT in the CNC device, the characters and graphics can be displayed by software to facilitate the user's operation and use. In the CNC device, such functions include: menu structure operation interface; Editing environment for part program; system and machine parameters, status, display of fault information, query or modify screen.
CNC self-diagnosis function: system's own fault diagnosis and fault location function. The general CNC system has more or less self-diagnosis functions, especially modern CNC systems. These self-diagnosis functions are mainly implemented by software. The CNC system with this function can quickly identify the type and location of the fault after the fault occurs and reduce the downtime. Usually different CNC devices have different diagnostic programs, which can be included in the system program, check during system operation, or as a service program, diagnose before the system is running or after the fault is stopped, find the faulty part. Some CNC devices can perform remote communication diagnosis.
CNC communication function: The function of information exchange between the CNC device and the outside world. Usually, the CNC system has an RS232C interface, which can communicate with the upper computer, transmit the part processing program, and some also have a DNC interface to facilitate direct numerical control. The higher-end system can also be connected with the MAP (Manufacturing Automation Protocol). To meet the requirements of large manufacturing system integration such as FMS, CIMS, IMS.
F command: Specify (composite) the feed speed command, with a number of digits after F, such as F150, F3500, etc. The number represents the actual composite speed value. It is a modal command, the unit is: mm/min (metric) or nch/min (imperial), depending on the programming unit selected by the user. If it is a metric unit, the above two instructions respectively represent: F=150mm/min; F = 3500 mm / min.
S command (cutting speed): Specify the spindle speed command, with a number of digits after S, such as S500, S3500, etc. The number indicates the actual spindle speed value. It is a modal command in r/min. The above two instructions respectively indicate the spindle speed: 500r/min; 3500r/min.
T, D command: specify the tool number and tool length, radius compensation storage register number command, by T, D followed by two digits, such as T11, D02 and so on. The numbers indicate the stored tool number and tool length in the library, and the radius compensation storage register number. The above two instructions respectively indicate that the subsequent machining will select the No. 11 tool in the tool magazine and use the value in the D02 register to compensate.