Products Description
Machining accuracy refers to the degree to which the actual geometric parameters (size, shape, and position) of a Milling Precision Part conform to its ideal geometric parameters after machining. In precision mechanical parts machining, errors are unavoidable, but they must be within acceptable limits. Error analysis helps to understand the basic laws governing these changes, allowing for corresponding measures to reduce machining errors and improve machining accuracy.
Causes of Errors
Spindle Rotation Error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle at any given moment relative to its average rotation axis, which directly affects the final accuracy of Metal CNC Machined Parts. The main causes of spindle radial rotation error include: coaxiality errors of several spindle journals, various errors in the bearings themselves, coaxiality errors between bearings, and spindle deflection.
Guide Rail Error. The guide rail is the reference for determining the relative positional relationship of various machine tool components and also the reference for machine tool movement. Uneven wear and installation quality of the guide rail are also important factors causing guide rail errors in the production of Custom CNC Milled Parts.
Transmission Chain Error. Transmission chain error refers to the error in the relative motion between the transmission elements at both ends of an internally connected transmission chain. Transmission error is caused by manufacturing and assembly errors in each component of the transmission chain, as well as wear during use, all of which influence the quality of Custom Milled Parts.
Tool Geometric Error. Any tool inevitably wears during cutting, causing changes in the workpiece's size and shape, especially when machining Precision CNC Milling Parts.
Positioning Error. One type is the datum non-coincidence error. The datum used to determine the size and position of a surface on a part drawing is called the design datum. The datum used to determine the size and position of the machined surface on the process drawing is called the process datum. When machining a workpiece on a machine tool, several geometric elements on the workpiece must be selected as positioning datums for Metal CNC Machined Parts. If the selected positioning datum does not coincide with the design datum, a datum non-coincidence error will occur. Secondly, inaccurate manufacturing errors in positioning pairs.
Errors caused by deformation under stress in the process system. One type is workpiece stiffness. In a machining system, if the workpiece's rigidity is relatively low compared to the machine tool, cutting tool, and fixture, the deformation caused by insufficient rigidity under cutting forces will significantly impact machining accuracy of Custom CNC Milled Parts. Secondly, there's the issue of cutting tool rigidity. External turning tools have high rigidity in the direction normal to the machined surface, and their deformation is negligible. However, when boring small-diameter internal holes, the tool holder's rigidity is very poor, and its deformation under stress greatly affects the hole's machining accuracy. Thirdly, machine tool component rigidity. Machine tool components consist of many parts, and there's currently no suitable and simple method for calculating their rigidity; experimental methods are still the primary means of determining it.
Errors caused by thermal deformation of the machining system. Thermal deformation of the machining system has a significant impact on machining accuracy, especially in the machining of Custom Milled Parts and large components. Machining errors caused by thermal deformation can sometimes account for up to 50% of the total workpiece error.
Adjustment errors. In each machining operation, adjustments to the machining system are always necessary. Since adjustments cannot be absolutely accurate, adjustment errors occur. In a machining system, the positional accuracy of the workpiece and cutting tool on a machine tool is ensured by adjusting the machine tool, cutting tool, fixture, or workpiece. When the original accuracy of the machine tool, cutting tool, fixture, and workpiece blank all meet the process requirements, and dynamic factors are not considered, the influence of adjustment error plays a decisive role in the machining accuracy of Precision CNC Milling Parts.
Measurement Error. When measuring OEM Milling Parts during or after machining, the measurement method, the accuracy of the measuring tools, the workpiece, and subjective and objective factors all directly affect the measurement accuracy.
Frequently Asked Questions
Q: What is machining precision?
A: Machining precision refers to the degree to which the actual dimensions, shape, position, and ideal parameters of CNC Machining Precision Parts match, with errors controlled within the allowable range.
Q: How are transmission chain errors generated? What are their effects?
A: Caused by manufacturing, assembly, and wear of transmission components; disrupting the relative motion of the transmission and reducing the machining quality of CNC Machining Turning Parts.
Q: Factors affecting measurement errors?
A: Measurement methods, gauge accuracy, workpiece condition, and subjective and objective environmental factors all contribute to measurement deviations in CNC Milling Metal Parts.
contact us
Based on a deep understanding and systematic solution to the causes of the above machining errors, our Milling Precision Parts implement high-precision machining standards throughout the entire chain, from machine tool selection and process design to inspection and release. This effectively controls dimensional and positional errors within stringent tolerances, perfectly adapting to the performance requirements of various high-end equipment for precision components, providing customers with stable and reliable core component solutions. If you have any needs for custom milling parts, prototyping, or batch processing, please feel free to contact us with your drawings and technical requirements. We will provide you with a one-stop processing solution that offers high precision and low error.
