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7 Big Deviation In CNC Machining Mechanical Parts

wallpapers Industry 2020-02-22 PDF Format
In the modern era, the current CNC machining cannot escape the fate of a hundred industries. There will also be some errors in the machining process, mainly the following seven major errors:

1. Error of machining principle

The principle error of CNC machining is the error caused by the use of approximate machining movement methods or approximate tool contours. Because there is an error in the machining principle, it is called a machining principle error. As long as the principle error is within the allowable range, this machining method is still feasible.

2. Geometric error of machine tool

The manufacturing error, installation error and wear of the machine tool directly affect the machining accuracy of the workpiece. Among them 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 cutting tools

Manufacturing errors, installation errors, and wear during use of CNC-machined tools all affect the machining accuracy of the workpiece. During the cutting process of the tool, the cutting edge, the cutting surface and the workpiece and the chip produce strong friction, which makes the tool wear. When the tool wear reaches a certain value, the surface roughness value of the workpiece increases, the color and shape of the chip change, and it is accompanied by vibration. Tool wear will directly affect cutting productivity, machining quality and cost.

4. Fixture error

CNC machining fixture errors include positioning errors, clamping errors, fixture installation errors, and tool setting errors. 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 will not matter. Tool manufacturing errors and wear.

5.Positioning error

Positioning errors mainly include reference misalignment errors and inaccurate positioning manufacturing errors. When prototyping machining a workpiece on a machine tool, several geometric elements on the workpiece must be selected as the positioning reference during machining. If the selected positioning reference and design reference (the reference used to determine the size and position of a surface on the part drawing) ) If they do not overlap, a reference misalignment error will occur. The workpiece positioning surface and the fixture positioning element together form a positioning pair. Due to the inaccurate manufacturing of the positioning pair and the gap between the positioning pairs, the larger position variation of the workpiece is called positioning. Inaccurate manufacturing errors. The inaccuracy of the positioning sub-manufacturing will only occur when the adjustment method is used for machining and will not occur during the trial cutting method.

6.Adjustment error

In each step of machining, the process system must be adjusted in one way or another. Since adjustment is impossible to be accurate, adjustment errors occur. In the process system, the mutual position accuracy of the workpiece and tool on the machine tool is ensured by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of the machine tools, tools, fixtures, and workpiece blanks meets the process requirements without considering dynamic factors, adjustment errors play a decisive role in machining errors.

7.Measurement error

When cnc machine shop measured during or after machining, the measurement accuracy, the accuracy of the measuring tool, and the workpiece and subjective and objective factors directly affect the measurement accuracy.
The above seven machining errors can be avoided to a certain extent. Therefore, the operators who need to perform machining can perform more careful inspection and verification of the six machining processes that are likely to cause machining errors during machining Then carry out machining operations, so that the impact of machining errors can be better reduced.
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