A Brief Discussion on CNC Machining "style=" font size: 18px; text-decoration: underline; Process analysis and planning of CNC machining

Programming process analysis and planning mainly include three major parts: processing object and processing area planning, processing process route planning, and processing process and processing method planning.

1. Planning of processing objects and processing areas

Dividing the processing object (workpiece) into different areas and using appropriate (different) processing techniques and methods for processing is aimed at improving processing efficiency and surface quality.

There are several common types of partitioned machining: (1) When the machining surface shape of the workpiece varies greatly, it is necessary to perform partitioned machining. (2) When there is a significant difference in the required precision and surface roughness for surface processing. (3) When there is a significant difference in size between different areas of the processed surface.

2. Planning of processing technology route

When designing the CNC process route, priority should be given to arranging the machining sequence, which should be comprehensively considered based on the structure of the parts, the shape of the blank, and the requirements for positioning, installation, and clamping of the workpiece. It generally needs to follow the following rules: the processing of the previous process cannot affect the positioning and clamping of the subsequent process

The machining process should start with rough machining and then finish machining, with machining allowance decreasing from large to small

First perform inner cavity processing, then proceed with outer contour processing

Minimize the number of tool changes and repeated positioning and clamping of workpieces as much as possible

3. Determination of processing technology and cutting methods

Tool selection: Choose appropriate tools for different machining processes and machining areas.

Selection of tool path form: A reasonable tool path trajectory can better ensure the quality and efficiency of machining.

Error control: Determine the error links and error control parameters related to programming.

Residual height control: Based on comprehensive considerations such as tool parameters, machining parameters, and machining surface requirements, strive to improve machining efficiency as much as possible.

Cutting process control: cutting quantity control, machining allowance control, advance and retreat tool control, cooling control, etc

Safety control: including safe height, avoidance zone, interference check, etc.

Process analysis planning is a flexible part of numerical control programming, which is influenced by multiple factors such as machine tools, cutting tools, and material properties. At the same time, it tests the programmers' grasp of experience, and the eternal pursuit of programmers is to successfully complete production under the premise of efficiency and safety.