Application of CNC Lathe in Multilevel Throttle Valve Processing of Control Valve
**Abstract:** This paper discusses the programming and challenges involved in machining multi-stage throttle stems of control valves using a CNC lathe. With the rapid development of numerical control technology, CNC machine tools have become widely used in the machinery manufacturing industry. These machines offer multi-axis linkage capabilities, making it possible to process complex curves and surfaces that are difficult or impossible for conventional lathes to handle. The multi-stage throttling control valve produced by our company enjoys a significant market share due to its stable performance and accurate regulation. However, its multi-stage throttle stem has a complex shape, making it challenging to machine. Traditional single-board lathes require time-consuming manual programming with binary code, which is error-prone and inefficient. In contrast, CNC lathe programming allows for quick and precise generation of machining programs, ensuring high-precision results.
This article presents an example of programming a multi-stage throttle valve using the CK0620 CNC lathe, which uses a dual 8031 system as its main control unit. The program involves calculating the coordinates of the throttle stem based on the data provided in Table 1. The X and Z values represent the dimensions of the throttle stem at different stages, while H indicates the travel distance. To simplify programming, incremental coordinates are used, where U represents the X-axis movement and W represents the Z-axis movement. After calculation, the machining coordinates (Table 2) are derived from the original data through rounding and adjustment.
The program structure includes cycle instructions such as G22 and G80, allowing repeated processing of specific sections of the throttle stem. The first stage features an arc transition, while subsequent stages follow similar patterns but require slight adjustments. Each section is programmed separately to ensure accuracy and smooth surface finish. The use of cycle commands reduces program length, improves readability, and minimizes errors. Additionally, the program can be adjusted during the machining process to meet tolerance requirements, ensuring the final part meets design specifications.
In conclusion, CNC lathe machining significantly improves the accuracy, repeatability, and consistency of multi-stage throttle stems. It reduces human error, enhances efficiency, and ensures that even complex curved surfaces are machined with precision. This makes CNC technology essential for modern manufacturing processes, especially in the production of high-performance control valves.
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