What Causes Errors in CNC Machining

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What Causes Errors in CNC Machining

What Causes Errors in CNC Machining
What Causes Errors in CNC Machining

Precision plays an extraordinary role in the CNC Machining process, especially now that many precision parts require extremely high precision in CNC machining. However, there will be many errors in the CNC machining process. If these errors cannot be dealt with in a timely and effective manner, it is obvious that the CNC processed products will not meet the standards. Today, 3QMachining will analyze the causes of errors in CNC machining for everyone, so as to help you quickly find out the cause and solve the error problem.

CNC Machining positioning error

The reference point does not overlap the deviation

The standard used to confirm a certain surface layer specification and specific location on the part drawing is called the design concept standard. The standard used in the process flow chart to confirm the specifications and specific positions of the processed surface layer of the process flow is called the process flow standard. When carrying out finishing machining on steel parts on CNC Machining processing, it is necessary to select a number of basic geometrical elements on the steel parts as precise positioning datum during finishing. If the precise positioning datum used does not overlap with the design plan datum, it will cause The standard does not overlap the deviation.

CNC machining accurately locates the deviation of inaccurate production and manufacturing

The components on the fixture are difficult to be produced with absolute accuracy according to the basic specifications, and their actual specifications (or specific positions) are allowed to vary within the dimensional tolerance range of the distinguished specifications. The precise positioning surface of the workpiece processed by the CNC Machining and the precise positioning components of the tooling and fixture form a precise positioning pair. In view of the inaccurate production and manufacturing of the precise positioning pair and the mutual cooperation gap between the precise positioning pair, the steel parts have a large specific position change. Inaccurate and error-free deviations are manufactured for precise positioning.

The geometric deviation of CNC machining tools

All CNC tools will inevitably be worn out during the turning operation, which will result in changes in the specifications and appearance of the steel parts. Reasonably use of tool materials and adopt new wear-resistant tool materials, scientific and reasonable use of the main geometric parameters and cutting parameters of the CNC tool, properly select of coolant, etc., can greatly reduce the damage of the CNC tool. Compensation equipment can also be used to compensate for the wear of CNC tool when necessary.

Spindle deviation of CNC Machining processing

Spindle bearing rotation deviation refers to the amount of change of the actual rotation centerline of the spindle bearing at a moment relative to its average rotation centerline. The key reasons that cause the axial rotation deviation of the main shaft bearing are: the parallelism deviation of several journals of the main shaft bearing, the deviation of the rolling bearing itself, the deviation of the parallelism in the middle of the rolling bearing, and the winding of the main shaft. Appropriately improve the manufacturing precision of spindle bearings and shells processed by CNC Machining, adopt high-precision rolling bearings, improve the precision of assembly process of spindle bearing parts processed by CNC Machining, carry out a stable balance of high-speed spindle bearing parts, and carry out roller bearings etc., can improve the rotation precision of the CNC lathe spindle.

Adjustment deviation

In each process of CNC machining, various adjustments must be completed to the machining process operating system. Because the adjustment is not absolutely accurate, it causes an adjustment deviation. In the machining process operating system, the specific position accuracy between the workpiece and the CNC tool on the machine tool on the lathe is guaranteed by adjusting the CNC Machining, tools, fixtures or workpieces. When the original accuracy of CNC Machining, tools, fixtures, workpieces, etc., all meet the process requirements and without considering dynamic factors, the influence of adjustment errors will play a decisive role in the CNC Machining accuracy.

Deviation of transmission gear

The transmission system deviation of CNC machining transmission gear refers to the deviation of the relative movement of the first and last two-wheel transmission system components in the connecting transmission gear. The deviation of the transmission system is the deviation caused by the manufacturing and assembly processes of the important links in the transmission gear, and the error caused by the wear during the application operation process.

CNC machining high-speed rail accessories
Author: Mose Li

Author: Mose Li

Director of Project Engineering at 3Q Machining

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