High speed cnc vertical milling machine, I believe everyone will not be too unfamiliar. Simply put, it is a highly automated processing equipment that can automatically change processing tools. When the workpiece is processed on it, high-precision processing of multiple processes such as milling, drilling, boring, reaming, and tapping can be completed in one clamping.
Moreover, the completion of these processing contents is automatically completed by the control device of the machine tool by executing the processing program of the workpiece. Basically, there is no need for actual control by front-line processing personnel during processing. The advantage of this is that it can greatly ease the labor intensity of front-line processing personnel. More importantly, because the entire processing of the workpiece is automatically completed on the high speed cnc vertical milling machine, this can greatly reduce the number of front-line processing personnel. This is also in line with the current trend of machining transformation from labor-intensive to technology-intensive.
Through the above introduction, it is not difficult to see that the focus of the high speed cnc vertical milling machine is the preparation of the workpiece processing program, which is the basis of the entire processing. Today, the author briefly introduces the method of correcting the program origin in the CNC programming of the Yixi vertical machining center with many years of experience in first-line processing. I hope it will be of some use to everyone.
We know that high speed cnc vertical milling machine workpiece processing is carried out in accordance with the machining origin position and program requirements determined after the workpiece is clamped. The machining origin is also called the program origin, which refers to the position of the corresponding programming origin in the machine coordinate system after the workpiece is clamped. The processing coordinate system refers to the coordinate system established based on the determined processing origin. However, once the workpiece coordinate system is established, it remains valid until it is replaced by a new workpiece coordinate system. Therefore, the origin of the workpiece coordinate system should be selected as far as possible to meet the conditions of simple programming, less size conversion, and small machining errors caused. In general, the origin of the rhino program should be selected on the datum of dimensioning or positioning.
Generally speaking, the origin of the program can be determined by auxiliary tools to find the origin of the workpiece. Commonly used auxiliary tools include edge finder, tool setting block, dial indicator, etc. Among them, there are two types of edge finder, mechanical type and electronic contact type. Specifically, let's take a look at the common method of correcting the origin of the program:
1. The method of Z coordinate correction
Generally, for the Z axis alignment of high speed cnc vertical milling machine, the tool setting block is often used to measure the Z coordinate value of the tool. The alignment steps are:
First, adjust the CNC numerical control system to manual mode, switch the screen to the display state of the machine coordinates; then place a tool setting block on the workpiece, and use the tool setting block to test plug with the tool end or tip. Through the repeated adjustment of the machine tool spindle in the Z direction, the tool setting block is in contact with the tool end face or the tool tip, and this point is the program origin in the Z direction. However, you must be careful during the alignment process to prevent the tool from colliding with the tool setting block. This is to input the Z coordinate value of the machine coordinate displayed on the screen into the CNC numerical control system.
Second, the method of XY coordinate correction
In the high speed cnc vertical milling machine numerical control processing, the XY plane can be calibrated by the dial indicator and the edge finder to calibrate the origin of the program. However, they are used in different occasions. For details, see the following, Use the edge finder to find the origin of the program
When the geometry of the workpiece is rectangular or rotating, we generally use a centrifugal edge finder to find the origin of the program. The alignment steps are
First, enter the following program in the semi-automatic (MDI) mode: S600M03; then run the program to rotate the edge finder, generally choose the speed of 600r/min; then enter the high speed cnc vertical milling machine CNC numerical control system into manual operation Mode, and switch the screen to the mechanical coordinate display state; find the corresponding coordinate values of the workpiece low point and high point through manual pulse, and then input it into the CNC numerical control system; the Y axis coordinate is the same as the method of determining the X axis. 2. Use a dial indicator to find the origin of the program.
Use the dial indicator to find the program origin suitable for the workpiece with a geometric shape of revolution, and use the dial indicator to make the spindle axis of the vertical machining center coaxial with the workpiece axis. The specific steps are as follows:
First, manually lower the spindle of the machine tool to near the upper surface of the workpiece, and attach the magnetic gauge holder to the end surface of the spindle. Adjust the dial indicator head to be perpendicular to the cylindrical surface of the workpiece; then perform independent alignment on the X-axis or Y-axis. By rotating the main shaft, the dial indicator rotates around the workpiece between the minimum diameter and the maximum diameter. By repeatedly adjusting the worktable to make the pointer of the dial indicator at the same position at the two points, the X-axis alignment is completed. In the same way, perform the Y-axis alignment, and then enter the corresponding coordinate values of the XY-axis into the CNC numerical control system of the vertical machining center.
