How does the CNC machining center work on the knife?
Generally speaking,there are usually two coordinate systems:one is the mechanical coordinate system;the other is the workpiece coordinate system,also called the program coordinate system.There is a fixed reference point in the machine coordinate system of the machine(assumed to be(X,Z).The purpose of this reference point is mainly to give the machine itself a position,because no matter where the tool holder stays after each power-on.The system sets the current position to(0,0),which will inevitably cause the reference to be non-uniform,so the first step of each boot is the reference point return(some called the zero return),that is,by determining(X,Z)to determine the origin(0,0).
For the convenience of calculation and programming,we usually set the program origin to the center of rotation of the right end of the workpiece,and try to make the programming reference coincide with the design and assembly basis.The machine coordinate system is the only reference for the machine tool,so you must figure out the position of the program origin in the machine coordinate system.This is usually done during the next tool setting process.
Second,the knife method
1.Trial cutting method The knife cutting method is the most common method of tool setting in practice.The following takes the GSK CNC system lathe as an example to introduce the specific operation method.
After the workpiece and the tool are clamped,the spindle is driven to rotate,and the tool holder is moved to the workpiece to test a section of the outer circle.Then keep the X coordinate unchanged and move the Z axis tool away from the workpiece to measure the diameter of the outer circle of the segment.Input it into the tool length in the corresponding tool parameter,the system will automatically subtract the diameter of the outer circle of the test cut from the current X coordinate of the tool,that is,the position of the origin of the workpiece coordinate system X.
Then move the tool to test the end face of the workpiece,and input Z0 in the tool width of the corresponding tool parameter.The system will automatically subtract the value of the Z coordinate of the tool from the value just entered,that is,the position of the Z coordinate of the workpiece coordinate system.
For example,the 2#cutter holder measures the outer diameter X asΦ50.78mm;then the X-axis tool input:“X50.78 measurement”.When the tool has an end face of 0,the Z value of the program origin when cutting the tool is 0.0.Save(50.78,0.0)to X and Z in the tool length of 2#tool parameter,and use T0202 in the program to successfully establish the workpiece coordinate system.
In fact,finding the position of the workpiece origin in the machine coordinate system is not to find the actual position of the point,but to find the position of the tool holder when the tool tip point reaches(0,0).In this way,the standard knife is generally not used for the knife,and all the tools of the knife to be used need to be aligned before processing.