What is the relationship between the machining accuracy of the mould in CNC machining center？

In the process of machining mold, the machining center has higher and higher requirements for accuracy and surface machining quality. To ensure the machining quality of the mold, we should consider the selection of machine tool, tool handle, tool, machining scheme, program generation, operator requirements, etc.

1. Select high-precision and high-speed machining center
With the improvement of product design requirements and the development of high-speed and high-precision machining technology, the quality of die NC machining is greatly improved, the machining speed of the die is significantly increased, the machining process is reduced, the production cycle and clamping times of die are shortened, and sometimes the time-consuming fitter repair work can be eliminated. The high-speed and high-precision machining of mold has gradually become one of the essential contents of the technological transformation of mold production enterprises. The high-speed CNC machining center will inevitably replace traditional low-speed machining, and the development of mold manufacturing technology will also bring us a richer product experience. CNC machining part

 

2. Adopt appropriate handle structure
Using high-speed and high-precision machining centers will also drive the renewal of relevant process equipment. In particular, the influence of the tool on NC machining quality and tool handle will become prominent. In the rotary tool machining system, the chuck is closely connected with the machine tool (or its combination) to ensure the realization of tool machining performance. Generally, there are two interfaces between the machine tool and the tool shank: the HSK hollow tool shank and the BT tool shank. The taper of the interface between the spindle and the taper shank of the BT tool holder is 24:7. The traditional low-speed machining is suitable for use in this kind of tool holder connection mode. Because the BT tool holder and the machine tool spindle are only taper fit, the taper fit clearance will increase under high-speed centrifugal force, thus affecting the quality of NC machining. Generally, when the spindle speed exceeds 16000 rpm, we must use an HSK hollow handle. The HSK toolbar positioning structure is over-positioning, which provides a standard connection with the machine tool. Under the action of machine tool tension, it can ensure that the short cone and end face of the ttoolbaraisclosely matched with the machine tool. plastic part

 

3. Select the appropriate cutting tool
The reasonable use and selection of cutting tools will be an important factor affecting the quality of NC machining. Cemented carbide tools are more and more widely used. In high-speed machining, coating cemented carbide will replace most steel cutting tools, including reamers, ball cutters, dull cutters, and other simple tools. Coating cemented carbide will be essential in high-speed machining tool materials and can be applied to most conventional machining fields. aluminum part
In general, we know that we will select large-diameter cutters for machining in rough machining. To save cost and reduce the manufacturing difficulty of cutters, we will use machine-clamped carbide blades to make rough machining as much as possible to remove chips; in semi-fine machining, we will use high-speed and high feed inserts to make semi-fine machining move faster; in fine machining, we will try to use high-precision round head mirror blades as hard as possible. The quality alloy cutter bar ensures the strength of the cutter and the cutter bar, saving the expensive cost of selecting the whole alloy cutter while maintaining the machining accuracy. In the process of machining, we also need to pay attention to the fact that the radius of the inner contour fillet on the finished part must be greater than or equal to the tool's radius. The tool with a radius less than the corner's radius shall be selected for machining by arc interpolation or diagonal interpolation to avoid the over-cutting phenomenon caused by linear interpolation and ensure the quality of die finishing.

 

4. CNC process plan
In high-speed and high-precision machining, the importance of the design of the NC process plan has been raised to a higher position. The whole process of machining must be controlled. Any mistake will seriously impact the mold's quality so that the process plan will play a decisive role in the machining quality. If you want to learn UG programming, you can add a small editing center qq1139746274 (WeChat same number) to the NC machining process design, which can be considered as the state control of a system process plan from part blank to part machining and forming room. A good process plan is complex and requires development during the entire design process. It needs to be obtained after continuous practice summary and modification. In the design process, a lot of information should be considered, and the relationship between information is highly complex, which must be guaranteed by the actual work experience of the program designer. Therefore, the design quality of the process plan mainly depends on the knowledge and level of technical personnel.

Generally, a complete NC machining process planning includes the following contents:

1) selection of CNC machine tools.
2) selection of processing method.
3) determine the clamping method of parts and select the clamps.
4) positioning method.
5) inspection requirements and methods.
6) select the tool.
7) error control and tolerance control in machining.
8) define the numerical control process.
9) numerical control sequence.
10) selection of cutting parameters.
11) prepare a numerical control process program list.

 

5. CAM software

Good software can also improve the quality and efficiency of mold processing, such as Unigraphics and Cimiamtron, which are excellent mold processing software, mainly two kinds of software rich and practical different processing strategies, which are widely used in NC milling programming, machining programming, WEDM programming, and so on. The quality and efficiency of NC machining are greatly improved by complementing each other. High. If you want to learn UG programming, you can add qq1139746274 (WeChat with the same number) cimarron to remove the rough machining in the offset area and add the screw function, which will make the actual cutting more stable, eliminating the sudden change of feed direction between adjacent tool paths, reduce the acceleration and deceleration of cutting feed, maintain a more stable cutting load, extend the tool life, and play a vital role in the machine tool. Good protection.
Software is only a tool—an excellent programmer with rich experience and theoretical knowledge in field machining. At the same time, the NC program designer's proficiency in software functions is the decisive factor in molding NC machining. It plays a vital role in the quality and efficiency of NC machining. Therefore, a perfect training system for programmers should be established. First of all, designers should practice for some time in the CNC operation post, and only after passing the strict operation examination can they carry out the design training of the CNC program. To ensure the quality of NC machining, it is necessary to have a good NC program.

 

6. Operator
The machining center operator is the executor of NC machining, and their control of NC machining quality is undeniable. They know the real-time status of machine tools, tool handles, tools, processing technology, software, and cutting parameters of processing tasks. Their operations have the most direct impact on NC processing. Therefore, the skill and responsibility of the machining center operators are also the key factors to improve the quality of NC processing.
Conclusion: Although hardware equipment such as the machining center is essential, talent is the decisive factor affecting the quality of NC machining because the professional ethics, skill level, and post-responsibility of programmers and machine operators determine how effective various advanced equipment can be. We must pay attention to all processing aspects, especially human factors, sot NC machining center mold can be processed more widely.

 

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