Techniques for using economical CNC machine tools

At present, economical automatic CNC machine tools are widely used. Its price is low, the numerical control system is more reliable, in the use to overcome the shortcomings, play the advantages, can achieve better economic benefits. Automatic machine tool equipment will be used in the use of several skills introduced to you for reference.

First, the installation of tools

The system software of economical CNC lathes usually has tool compensation function. In order to facilitate the test cutting and determine the relative position of the tool, after the compensation program of the tool is programmed, all the tool tips on the rotary tool holder are still required to be basically in the same position, and slightly higher than the center of the spindle. In order to quickly clamp the tools needed to process the same part, you can follow the steps below.

(a) Input such a program to the control system - after the tool holder is longitudinally retreated a length, the rotary tool holder is turned around a station and then longitudinally fed the length of the retreat to return to the original position.

(2) Hold a center on a three-jaw chuck.

(3) With the point or manual method, the rotary tool holder is in a position where the first tool can be installed, and the tool is installed as required, so that the tip of the tool coincides with the tip of the top, slightly higher than 0.2 ~ 0.5mm.

(4) Start the system, so that the tool holder runs according to the input program, and then after installation, the next tool can be installed one by one.

2. Axial positioning of parts

When processing parts in batches, the program and the origin need not be changed, but the parts are required to be in the same position each time. This can be done precisely in the following ways.

(1) A taper plug is installed in the spindle taper hole, and the center of the taper plug is provided with an adjustable screw.

(2) Each time the workpiece and the screw close. This ensures that the same part is held in the same position.

(3) Adjust the length of the screw to adapt to the position required by different parts.

Third, smart programming, avoid stepping out of step

We know that the starting torque of the stepper motor is small, and the rated torque is gradually reached after the speed increases. If we program the stepper motor to enter (or soon) strong cutting when it is just started, then the motor torque may be less than the cutting torque and "out of step", resulting in unqualified or scrapped machining parts. The repeated use of such a process, due to the "out of step", the position of the origin will also change, so that the processed batch parts are unqualified or scrapped. Therefore, the starting characteristics of the stepper motor should be considered when programming, and the tool should enter the cutting state after the stepper motor reaches the rated speed. According to our experience, let the tool holder run no load after 6mm and then enter the cutting, there has been no "out-of-step" phenomenon.

Fourth, clever programming, to avoid tool wear error

We know that a newly ground tool, just began to process parts, the wear of the tool is irregular and faster, after processing small batches of parts, it enters a stable state, so when processing parts with new tools, the processed parts should be checked one by one. For small and medium-sized shaft parts, it takes about 4-5 pieces to enter the stable state of the tool. At this time, the wear of the tool is basically proportional to the number of parts processed. As long as the program is clever and the compensation amount of the tool is added, the quality of the batch machining parts can be guaranteed.

When the economical CNC lathe is used reasonably to process parts with higher precision, the quality is ensured, the efficiency is improved, the labor intensity of workers is reduced, and good economic benefits are achieved.