Some errors that need to be avoided in automatic lathe machining

With the development of processing and manufacturing, more and more parts are processed by automatic lathes. Automatic lathe machining is a kind of high-efficiency and high-precision equipment, which can process rotating parts such as shafts and disc sleeves. Carry out grooving, drilling, expanding, reaming and other work. The CNC lathe is controlled by software, which can ensure the key to the normal operation of the CNC machine tool. Once a certain parameter is lost or changed by mistake, it is easy to make some functions of the machine tool unable to be realized or the system to be chaotic or even paralyzed.

(1) Programming error: It is mainly the interpolation error generated by the numerical control system during numerical control programming, mainly due to the use of straight line segments or arc segments to avoid the contour of the part. This is an important factor affecting the machining accuracy of parts. It can be solved by increasing the number of interpolation nodes, but it will increase the programming workload.

(2) Tool nose arc error: When cutting inner holes, external causes or end faces, the tool nose arc does not affect its size and shape, but when machining tapered surfaces or arcs, it is affected by the tool nose arc, resulting in overcut or less cut. This error can be eliminated by measuring the radius of the tool nose arc and using the tool radius compensation function.

(3) Measurement error: It is mainly affected by the measurement accuracy of the measuring tool and the operation method of the measurer, resulting in inaccurate measured dimensions. This error can be compensated.

(4) Tool setting error: This error is mainly generated in the tool setting process. When the tool moves to the starting point position, it is affected by the feed adjustment ratio value of the operating system. The solution is to reasonably select the feed adjustment ratio, especially when the tool is close to the starting point position, use the feed adjustment to the small gear to accurately position the tool at the starting point position.

(5) System error of machine tool: the shape and position tolerance caused by the influence of the machine body, this tolerance is generally not adjustable; the repeated positioning error generated by the servo unit and the driving device is mainly affected by the system by the pulse equivalent size, uniformity and transmission route of the machine tool; These error quantities are small and stable and should only be considered during machining.