In recent years, the rate of numerical control of mechanical manufacturing equipment has increased rapidly. The use of CNC machine tools such as full-function CNC lathes, CNC vertical lathes, vertical machining centers, and horizontal machining centers has become increasingly popular. Compared with ordinary machine tools, CNC machine tools have many significant process features and programming skills, such as the ability to fully tap the performance characteristics of CNC machine tools, flexible applications, in the process and programming to break the conventional, unconventional processing technology and programming methods, can be Significantly increase production efficiency and product quality, reduce tool consumption, and greatly reduce processing costs.
In the long-term application of CNC machine tools, Dongfeng Liuzhou Automobile Co., Ltd., through continuous exploration and practice, has created a set of textbooks, numerical control machine tool application materials and machine tool programming data that are not relevant to the process technology and programming. Rule processing technology and programming methods make the functions of CNC machine tools fully utilized, which not only improves production efficiency and product quality, but also reduces tool consumption. The following describes some of Dongfeng Liuzhou Automobile Co., Ltd. through the practice to explore the way to break the traditional processing technology and traditional programming, and share with readers.
statement of problem
Compared with traditional ordinary machine tools and special machine tools, CNC machine tools have the advantages of flexible processing parts and being suitable for small batch processing of many types of parts. At the same time, CNC machine tools have the advantages of high accuracy of shape and position, and easy implementation of one-man multi-machine operation. However, in the mass production of parts, compared with special machine tools such as multi-position drilling machines, vertical-horizontal combined boring machines, and multi-axis lathes, it will reveal that the process is too concentrated, the production efficiency is low, the production tact time is long, and the tool High consumption costs (usually imported tools such as Sandvik Coromant, Mitsubishi and Walter, etc.) and high processing cost are disadvantages. Therefore, with the wide application of numerical control machine tools in mass production of parts, the production efficiency is improved and the beat is reduced. Time, reduced tool consumption, and reduced parts processing costs have become urgent problems for users.
solution
It is understood that, due to the long-term application of traditional machine tool processing technology, users often can not get rid of the traditional process constraints in the application of CNC machine tools, or in the preparation of the processing program by the use of cyclic programs (such as boring cycle program G85 and G87 Constraints of the G94, G94 and G90, and the use of a single fixed spindle speed and feed rate for programming the same part of the part (eg, end face, bore or outer circle, etc.) . In the roughing and semi-finishing, under the premise of equipment, tools and fixtures have been determined, the spindle speed, feed amount and cutting depth are often restricted by the tool. If the tool is easy to chip, it is often used to reduce the spindle speed, reduce The method of feeding or depth of cut to solve, but also brings negative effects of reduced productivity and increased processing costs.
Dongfeng Liuzhou Automobile Co., Ltd. has, after nearly 15 years of practice and exploration using CNC machine tools, gradually freed itself from the constraints of traditional processing techniques and processing programming methods and found a way to effectively increase production efficiency and reduce processing costs. According to the different types of parts, the classification according to the shape of the processing site can be divided into the typical types listed in the table. In the processing of the parts, the line speed, feed, and the equipment, tools, and fixtures have been determined. The amount and cutting depth are the main variables that affect the production efficiency, tool durability, surface roughness and dimensional accuracy. Therefore, the use of unconventional processing techniques and programming methods to solve the relationship between them can increase production efficiency. Reduce processing costs and introduce them to the intuitive reading of the current list.
The effect of processing different types of parts using unconventional programming methods
In summary, the key technology of unconventional machining processes and programming methods is mainly to break the constraints of traditional machining processes that use fixed line speeds and feedrates (because of conventional spindle speeds and feedrates for conventional machine tools and special machine tools). It is generally not possible to change the size during the cutting process.) In the cutting process, regardless of cutting any part, it is possible to change the spindle speed or the feed amount as desired. However, in practical applications, the feed amount should be changed during the roughing and semi-finishing of the same part of the cutting process, and the feed amount should not be changed during the finishing process because the feed size changes, and the size of the processing size will be affected. influences. In production, spindle speed or feed changes need to be used flexibly.
Wear-resistant welding rods
After beneficial exploration and experimentation, Dongfeng Liuzhou Automobile Co., Ltd. combined the advantages of CNC machine tools in realizing the promotion and application of CNC machine tools, making full use of the advantages of constant-speed machining of CNC machine tools, rapid and flexible shifting of spindle speed and feedrate, and cutting capacity Adapted to the requirements of the cutting performance of the blade under different cutting conditions, the processing methods of unconventional and unconventional processing procedures are used to achieve the best effect of production efficiency and tool durability, thereby reducing the production cost.
