General method of obtaining workpiece accuracy for custom CNC machining
Machining accuracy refers to the actual geometric parameters (size, shape, position) of the machined part that are consistent with the ideal geometric parameters required by the drawing. The greater the fit, the better the machining accuracy.
A, how to determine the dimensional accuracy of the part
1、Trial cutting method
That is, first cut a small part of the working table, measure the size of the trial cut, adjust the position of the cutting edge of the tool and the workpiece according to the working conditions, and then cut. Cutting and measuring usually takes 2 to 3 times.
The test-cut method is very accurate and does not require complex equipment, but this method is time-consuming (must be adjusted, tested, measured and calculated several times), inefficient and must be operated manually. The quality is not stable according to the technical strength and accuracy of the measuring instrument. Therefore, it is used only for single-piece and small batch production.
The test-cut method is also often used in conjunction with other methods.
2、Adjustment method
Adjust in advance the exact relative position of machine tools, fixtures, tools and workpieces to ensure the dimensional accuracy of the workpiece. This is an adjustment method, because the size is adjusted in advance, the processing does not require cutting, the size is automatically taken out, the part batch processing unchanged. For example, when using the milling machine fixer, the pair of tool blocks to determine the position of the tool. The essence of the precision CNC machining adjustment method is to apply the machine tool and fixture fixed range equipment or tooling equipment, so that the machine tool and fixture to a certain level of accuracy, a processing. The tool feed is also a cutting method that goes along with the dial. The method must first determine the scale in the dial according to the test cut method. Precision five gold machining in mass production, often use a certain category in the diameter, samples, templates and other tooling equipment to adjust.
This adjustment method has better processing accuracy and stability, precision parts processing plant production efficiency is higher. Does not require machine tools, but the requirements of the machine tool regulator is high. Commonly used in mass production and mass production.
