The focus of the vertical milling center 1165 lies in the preparation of the workpiece processing program, which is the basis of the entire processing. As a milling machine with an operating system, the machining center cannot do without programming. Today, the editor will briefly introduce the method of aligning the program origin during the programming of the vertical machining center. Please collect it quickly. Machining center 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 program should be selected on the datum or positioning datum of the dimension. 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 program origin of a small vertical machining center:
1. The method of aligning the Z coordinate of the machining center
Generally, for the alignment of the Z axis of the machining center, the tool 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 mechanical coordinates; then place a tool calibration block on the workpiece, and use the tool calibration block to test the end face or tip of the tool. Stuffed. Through 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 CNC machining of the machining center, you can use the dial indicator and edge finder to calibrate the program origin of the XY plane. However, they are used in different occasions, let's take a look:
1. The machining center uses 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 as follows: First, enter the following program in the semi-automatic (MDI) mode: S600M03; then run the program to rotate the edge finder, generally select the number of revolutions to be 600r/min; then enter the CNC numerical control system of the machining center. 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 coordinate of the Y axis is the same as the method of determining the X axis.
2. The machining center uses a dial indicator to calibrate 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 machining center coaxial with the workpiece axis. The specific operation steps are: First, manually set the machine spindle Lower to near the upper surface of the workpiece, attach the magnetic gauge base to the end surface of the spindle, adjust the dial gauge head so that it is perpendicular to the cylindrical surface of the work piece; then independently align 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 dial indicator pointers have the same positions 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 machining center.
