Axis workpieces encounter problems such as accuracy and surface roughness that are not required during the turning process. Analyze according to the specific process at the time of turning.
First, the reason why the dimensional accuracy can not meet the requirements and its solution 1) Because the operator is not careful, the child is making mistakes, or the dial is wrong and improper use, so when measuring, be careful and correct use of the dial is It is very important that the dials of the various types of lathes are different for the middle handle dial. Each small dial can be calculated by the following formula:
Scale to one car turning distance = drag screw distance / dial total number of lines (mm)
After knowing the scale value of each grid, please pay attention to the gap between the screw and the nut. Sometimes the dial rotates, but the cutter does not necessarily move. After the gap is turned, the cutter will move. Therefore, when using the scale, if the scale has turned too far, it is absolutely not allowed to reverse only a few squares, but to reverse the rotation and then realign the scale.
2) Before the measuring tool itself has an error or is not used, it must be carefully checked and adjusted before use.
3) Due to changes in temperature, the size of the workpiece is changed. During cutting, the chips are deformed, and the molecules of the chips move to each other, and they generate friction when moving to generate a large amount of heat. In addition, due to the friction between the chips and the front of the turning tool, the friction behind the turning tool and the surface of the workpiece also generates heat, which directly affects the tool and the workpiece. Of course, the highest heat is swarf (about 75%), followed by turning tools (about 20%) and workpieces (about 4%, and 1% in the air). When the workpiece is heated, the diameter increases (about 0.01 to 0.05 mm, the cast iron change is larger than the steel), and the diameter shrinks after cooling, resulting in waste. Therefore, it is not possible to measure when the workpiece temperature is high. If it is necessary to measure the amount, it is necessary to pour enough cutting fluid during turning to prevent the temperature of the workpiece from rising; secondly, to separate the coarse and fine cars.
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