Four elements to effectively improve the machining accuracy of CNC prototype models

During the proofing process of CNC prototype models, some prototype models have very high requirements for machining accuracy. So how can the prototype factory improve the machining accuracy of CNC prototype models? To improve the accuracy of CNC prototype processing, we must first understand the factors related to accuracy.

1. Choose the appropriate machining tool and tool holder structure

The reasonable use and selection of cutting tools will be an important factor affecting the quality of CNC machining. In high-speed machining, coated carbide will replace most of the front-end steel tools, including simple tools such as reamers, ball-end knives and boring cutters, and will be used in most conventional machining areas. In rough machining, we usually choose large diameter tools for machining. In order to save costs and reduce the difficulty of tool manufacturing, we will use machine-clamped carbide blades to remove chips as much as possible for rough machining; high speed is used for semi-finish machining. The high-speed feed blade tool makes the semi-finishing process faster; in the finishing process, try to use high-precision round-head mirror blades on the carbide tool holder to ensure the strength of the tool and the tool holder for correct processing. Processing. While maintaining accuracy, it saves the cost of choosing all-alloy tools. In processing, we also need to pay attention to the fillet radius of the inner contour on the finished part must be greater than or equal to the tool radius. Use a tool with a radius smaller than the corner fillet radius for circular interpolation or oblique interpolation. Processing, which can avoid over-cutting caused by linear interpolation and ensure the quality of mold finishing. In processing, we also need to pay attention to the fillet radius of the inner contour on the finished part must be greater than or equal to the tool radius. Use a tool with a radius smaller than the corner fillet radius for circular interpolation or oblique interpolation. Processing, which can avoid over-cutting caused by linear interpolation and ensure the quality of mold finishing. In processing, we also need to pay attention to the fillet radius of the inner contour on the finished part must be greater than or equal to the tool radius. Use a tool with a radius smaller than the corner fillet radius for circular interpolation or oblique interpolation. Processing, which can avoid over-cutting caused by linear interpolation and ensure the quality of mold finishing.

2. Reasonable CNC machining plan

In high-speed and high-precision machining, the design importance of the numerical control process plan has been mentioned to a higher position. The entire process must be controlled. Any error will seriously affect the quality of the mold, so the process plan will affect the processing quality. Play a decisive role. The CNC machining process design can be regarded as the state control of the system process plan from the part blank to the part forming.

A good process plan is more difficult in the entire design process, and can only be obtained after continuous practice summary and modification. The amount of information to be considered in the design process is very large, and the relationship between the information is extremely intricate, and programming must be used to ensure the actual work experience of the designer. Therefore, the design quality of the process plan mainly depends on the experience and level of the technicians.

3. Scientific management and maintenance

The positioning accuracy of CNC machine tools is an important accuracy that is different from ordinary machine tools. Together with the geometric accuracy of the machine tool, it has an important impact on the cutting accuracy of the machine tool, especially the hole pitch error in hole machining. CNC machine tools can judge their machining accuracy based on their achievable positioning accuracy. Therefore, detecting and compensating the positioning accuracy of CNC machine tools is a necessary way to ensure machining quality. In addition, due to wear, as the movement pair gap gradually increases, the reverse deviation will also increase. Therefore, it is necessary to regularly measure and compensate the reverse deviation of each coordinate axis of the machine tool.

4. Use better CNC processing equipment

In CNC processing, the processing accuracy of the mold is related to the equipment. The better the processing equipment, the higher the processing accuracy. So choosing a better CNC equipment is a straightforward method. In order to meet the customer's demand for higher processing accuracy, all CNC equipment was replaced with better CNC equipment, which achieved the highest precision of 0.02mm on the hardware.