The development history of CNC precision machinery lathe processing

1. Machining principle error

The principle error of CNC precision machining is the error caused by the use of an approximate machining motion or an approximate tool profile. It is called processing principle error. As long as the principle error is within the allowable range, this processing method is still feasible.

2. The geometric error of the machine tool

The manufacturing error, installation error and wear of the machine tool directly affect the machining accuracy of the workpiece. The main ones are the rotary motion of the machine tool spindle, the linear motion of the machine tool guide rail and the error of the machine tool transmission chain.

3. Manufacturing error and wear of the tool

The manufacturing error, installation error and wear of the tool processed by CNC precision machining all affect the machining accuracy of the workpiece. During the cutting process of the tool, the cutting edge and the cutter face have strong friction with the workpiece and chips, which causes the tool to wear. When the tool wear reaches a certain value, the surface roughness value of the workpiece increases, the color and shape of the chips change, and there is vibration. Tool wear will directly affect cutting productivity, machining quality and cost.

4. Fixture error

The fixture error of CNC precision machining includes positioning error, clamping error, fixture installation error and tool setting error. These errors are mainly related to the manufacturing and assembly accuracy of the fixture.

CNC machining accuracy cannot be perfect, as long as the error is controlled within a certain range, it is insignificant.

5. Positioning error

The positioning error mainly includes the reference misalignment error and the inaccurate error of positioning pair manufacturing. When processing the workpiece on the machine tool, several geometric elements on the workpiece must be selected as the positioning datum during processing. ) does not coincide, a reference misalignment error will occur. The positioning surface of the workpiece and the positioning element of the fixture together form the positioning pair. The large position change of the workpiece caused by the inaccurate manufacturing of the positioning pair and the matching gap between the positioning pairs is called positioning. Sub-manufacturing inaccuracy errors. The inaccurate manufacturing error of the positioning pair will only occur when the adjustment method is used for processing, and will not occur in the trial cutting method.

6. Adjustment error

In each process of machining, it is always necessary to adjust the process system in one way or another. Adjustment errors arise because the adjustment is impossible to be accurate. In the process system, the mutual positional accuracy of the workpiece and the tool on the machine tool is guaranteed by adjusting the machine tool, tool, fixture or workpiece. When the original precision of machine tools, tools, fixtures and workpiece blanks all meet the process requirements without considering dynamic factors, the adjustment error plays a decisive role in the machining error.

7. Measurement error

When the part is measured during or after processing, the measurement accuracy is directly affected by the measurement method, the accuracy of the measuring tool, the workpiece and the subjective and objective factors.

The above seven machining errors can be avoided to a certain extent, so operators who need to perform machining can be more careful and careful about the six machining processes that are likely to cause machining errors. After testing and verification of all aspects, the machining operation is carried out, so that the influence of machining errors can be better reduced.

In the process of CNC precision machining cooperation, the material can be negotiated, the price can be negotiated, the processing method can be negotiated, the delivery time can be negotiated, and the content of after-sales service can also be negotiated, but the payment method cannot be negotiated. , Only after the advance payment is in place, our mechanical parts processing factory can arrange production, otherwise we will not consider cooperation.

This is not our exclusive terms, but the code of conduct for the entire Shenzhen precision machining industry. Under the existing cooperation method, after many precision parts and components are delivered to customers, there are several cases of late payment each month. Our after-sales service team often needs to undertake the work of recovering accounts payable, which is extremely miserable. .