Principles and Applications of CNC Machining for High-Precision Parts
Release date:
2022-06-14
Principles and Applications of CNC Machining for High-Precision Parts The process flow for machining high-precision parts is governed by extremely stringent specifications. Failure to adhere to these guidelines can result in dimensional deviations that exceed tolerance limits, necessitating rework or even scrapping the raw material, thereby significantly increasing manufacturing costs. Therefore, today we will discuss the key requirements for machining high-precision components, which can help you enhance productivity.
Patterns and Applications of High-Precision Part Machining in CNC Manufacturing
What are the key principles for CNC machining high-precision parts?
The process flow for high-precision part machining is governed by stringent specifications; failure to adhere to these can result in workpiece deviations exceeding dimensional tolerances, necessitating rework or even scrapping the raw material, thereby significantly increasing manufacturing costs. Therefore, today we’ll discuss the guidelines for machining high‑precision parts, which can help you boost productivity.
First, at the regulatory level, manufacturing must strictly adhere to the dimensional tolerances specified in the engineering drawings. Although, in practice, the dimensions of components produced by the company may not be identical to those on the drawings, as long as the actual dimensions fall within the dimensional tolerance limits defined by the relevant technical standards, the parts are considered conforming and may be used as intended.
The allocation of machining sequences for high-precision CNC parts should be determined based on the part’s geometry, the condition of the blank, and the need for accurate positioning and clamping. Crucially, the product and workpiece must not be damaged; operations in higher‑level processes must not compromise the dimensional accuracy or clamping requirements of subsequent operations. Furthermore, the machining strategies for common‑use and high‑precision components that intersect across multiple stages must also be carefully evaluated.
The process involves adding internal features and internal walls, followed by external design and machining. By employing identical precision positioning and clamping methods or the same tooling and machining strategies, development can be integrated to minimize the frequency of repeated precision repositioning, tool changes, and pin adjustments. For multiple operations performed on the same machine, priority should be given to those processes that impose the least damage to the workpiece’s rigidity.
CNC machining technology has been widely adopted.
Compared with manual machining by manufacturers, manual processing offers significant advantages, such as the precision and usability of parts produced on CNC machine tools. CNC machines can fabricate complex components that are impossible to achieve through manual methods, leading to the widespread adoption of CNC technology. Today, most machining shops are equipped with CNC capabilities. Typical CNC machining processes include CNC machining centers, CNC turning centers, and wire EDM (electrical discharge machining). Specialized tooling developed for CNC machining centers is referred to as CNC machine tools or CNC machining management systems. A CNC lathe used for cutting operations within a CNC machining center is called a CNC turning center. While G‑code for CNC machining can be written manually, in practice machining shops typically employ CAM (computer-aided manufacturing) software to automatically import CAD (computer-aided design) files and generate G‑code programs for operating CNC machines. In machining center operations, the definition of machining paths generally follows the following standards:
1. It must ensure the dimensional accuracy and surface roughness of the machined parts.
II. Shorten the processing line, reduce idle scheduling time, and improve processing efficiency.
3. Simplify the computational effort of numerical methods and streamline the process flow as much as possible.
4. For certain reusable program procedures, application blocks should be used.
Alright, that’s all for today—let’s save the rest for the next episode. See you then!
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