Introduction
CNC machining center is a machine tool that uses computer numerical control computer as the basic control platform, uses digital programs as the processing technology and uses a variety of cutting tools and cutting tools to machine and process complex parts, to realize automatic machining. Nowadays, with the development of science and technology, CNC machining centers have become a necessary process in the production process of production and manufacturing enterprises. It can process various materials, such as high hardness materials, heat resistant materials and alloy materials. This paper mainly introduces the machining process of CNC machining center.
Overview
CNC machining center is a numerically controlled machine tool capable of continuous processing of various multi-dimensional profiles on a workpiece in a variety of orientations. Compared with ordinary machine tools, CNC machining centers occupy an leading position both in terms of process accuracy and cost. The quality, accuracy and efficiency of the machined parts are far superior to those of conventional machine tools.
Process sequence
The machining processes of CNC machining centers can be classified into different states according to the process requirements. Generally, the machining process consists of nine steps: programming, workpiece setting, setting up fixtures and tools, selecting the circular arc knife, straight knife machining, dynamic machining and static machining, processing verification, post-processing treatment and finishing.
1. Programming: this step is the most essential of the entire machining process. In the programming stage, we must use professional computing software and master the design software. This requires us to have professional programming background, which not only requires us to understand the geometric data of the workpiece, but also requires us to understand the contour of the parts, and the connected relationships among various machining data, which can form a complete numerical control programming.
2. Workpiece setting: in this step, the workpiece should be treated properly according to the machining requirements. The workpiece should be put into the worktable, fixed and checked in position, and the center point of the workpiece should be marked.
3 . Fixture and tool setting: According to the machining requirements and the surface of the parts, special fixtures and tools should be selected and set properly to ensure the accuracy of the machined surface and the stability of the clamping.
4. Select circular arc knife: before the machining of parts, the right rotary knife should be chosen according to the surface shape of parts. During the knife selection process, the motion characteristics of the rotary knife should be taken into consideration.
5. Straight knife machining: When the knife is selected, we should pay attention to the parameters of the cutting depth, feed speed and spindle speed. The selected cutting tool should be mounted on the machine tool, and the necessary machining area should be calibrated.
6. Dynamic machining: It refers to the machining of parts that require higher machining accuracy and are difficult to clamp with ordinary fixtures. The dynamic machining process includes three stages: automatic tool setting, automatic tightening of the tool and automatic cutting.
7. Static machining: Static machining typically refers to the machining of parts that can be clamped with ordinary fixtures. The cutting process is basically the same as straight knife machining, except that more attention must be paid to the clamping force.
8. Processing verification: this step is mainly for verification of the accuracy of the workpiece after machining, including measuring the machining size of the workpiece, measuring the profile and other relatively complicated verification.
9. Post-processing treatment and finishing: After the verification of the machined parts is passed, it needs to be treated properly according to the requirements, such as polishing, rust removal and passivation.
Conclusion
In summary, these are the nine steps of machining process of CNC machining center. To sum up, it can be said that the automation and intelligence of CNC machining center is an inevitable trend for the development of modern machine tool industry. The development of CNC machine tools has improved the manufacturing ability of enterprises and has been widely recognized and accepted.
