How does the tool tip arc affect the turning milling composite processing and how to handle it
Turning milling compound machining is a high-tech method for machining hardware parts. It can process various types of materials, including 316 and 304 stainless steel, carbon steel, alloy steel, aluminum alloy, zinc alloy, titanium alloy, copper, iron, plastic, acrylic acid, POM, uhwm and other raw materials, and can be processed into square and round complex structural parts. During the use of CNC lathe, in order to reduce the surface roughness of the workpiece to be processed, slow down tool wear, and improve tool life, the turning tool tip is usually ground into an arc shape, and the arc radius is generally 0.4~1.6mm. CNC lathes (G41, G42) with tool tip radius compensation function are used. As long as the processing program is directly programmed according to the workpiece size, the tool tip arc will not cause processing errors; NC lathes without this function will be affected by the tool tip arc during machining. In serious cases, the workpiece will be scrapped due to out of tolerance
The Method of Eliminating Machining Error of CNC Lathe.
1. Change the programming size: adjust the tool tip path during programming, so that the actual machining contour of the arc tool tip is consistent with the ideal contour
2. With the tool point arc center as the tool location, the programming steps are as follows: draw a sketch of the workpiece → draw the arc path of the tool point according to the arc radius r of the tool point and the size of the workpiece → calculate the characteristic point of the arc center path → program. In this process, it is troublesome to draw the center track of the tool tip arc and calculate its characteristic points. If the cutting machine uses the isometric drawing function and point coordinate query function of CAD software to complete this work, it will be very convenient. In addition, when using this method to process, the operator should pay attention to the following two points: 1) Check whether the R value of the tool tip arc radius used is consistent with the R value in the program; 2) In the process of tool setting for turning milling composite processing, the value of R should be considered, that is, if the tool compensation values obtained through tool setting are x (x axis) and y (Z axis), the actual tool compensation values that should be entered are x-2r and y-r.