On the requirements of CAM software for high-speed

Talking about the requirements of CAM software for high-speed machining I

cam means computer-aided manufacturing, that is, using such "software" with good machine tools and tool systems to process suitable parts at high speed and efficiency. Using good C may produce interaction, and am actually requires higher quality of people than using good so-called CAD (Computer Aided Design). When using CAD software, it is only necessary to have a personal computer. For cam, the operator needs not only computer knowledge, but also process knowledge and processing experience, to understand the performance of the processing machine, the requirements of clamping parts, measurement and detection, and tool performance... For CAD system, once the design is wrong (refers to before being submitted for processing and manufacturing), It can be completely reversed or some partial modifications and adjustments can be made, and only time will be lost; For cam, if errors occur during processing, it will not only lose time, but also scrap the blank, damage the tool system and even the machine tool. Therefore, the world's famous CAM software providers represented by British Delcam company have been committed to the research of efficient processing and safety of cam system. A really good CAM software not only needs "easy to learn and use" from the perspective of computer application and "multiple processing strategies" from the perspective of production and processing process requirements, but also has various "collision interference and predictive inspection" functions from the perspective of safety, so that when a part processing tool has not been started, the whole "processing system" - here includes machine tools, cutters, clamping, processing tool paths, blanks Detection device, etc. - 1. Polysulfone is a transparent solid material of Hupu in a completely "consistent" state, so as to ensure that the processed parts meet the requirements

the software of mechanical cam involves all aspects of processing and manufacturing. From the machine tool, check whether the oil filling joints and fasteners are loose, such as turning, milling, electric spark, laser processing, etc; In terms of processing types, there are finished parts processing and mold processing; In terms of technology, there are rough, semi fine and fine machining. A cam software can never cover all the above requirements. In the following, the author hopes to discuss how an excellent NC programming cam system should "match" the functions of high-speed machine tools and tool systems, so that it can "maximize" the processing efficiency from the perspective of "the requirements of high-speed machining for CAM software". That is "how to choose the best (high-speed milling) CAM software"

first review the definition of "high speed machining":/p>

high speed machining does not use higher spindle speed and faster machine feed to process the original tool path

high speed machining is a small cutting constant load and fast tool walking

high speed machining is to give full play to the cutting efficiency of high-speed machine tools and cutting tools

secondly, it is analyzed from the characteristics of high-speed machining:

high-speed machining requires a very high cutting line speed of the tool tip, mainly from the spindle speed and tool size

high speed machining requires more processing procedures, that is, the depth of each cutting is relatively shallow,

high speed machining can directly process quenched materials

high speed machining requires constant machine load/constant material removal rate

sharp corner movement should be avoided during high-speed machining

then compare the traditional methods in terms of processing procedures:

taking the processing of molds as an example, high-speed machining generally requires only five processes, namely blank quenching, rough machining, finishing, ultra finishing and local polishing; Traditional machining requires more than 8 processes, namely blank annealing, rough machining, semi finishing, quenching, electrode machining, electrical machining, local finishing and manual polishing. As far as finishing is concerned, although a very small cutting depth is adopted, the speed of material removal during high-speed machining should be more than 4 times that of traditional machining, which improves the processing speed and saves the time of fitter manual grinding, and the improvement of workpiece surface processing quality also saves the time of polishing, spark and other processes

let's look at what factors will affect high-speed machining from another perspective. The first is the "carrier" of high-speed machining - machine tools. The effect of high-speed machine tool processing mainly depends on the processing performance of the machine tool itself, including the rigidity, balance and internal accuracy of the machine tool. According to different processing requirements, it is necessary to appropriately select the size of the machine tool processing site, the CNC system with high-speed and pretreatment capacity (looking forward), the machine tool spindle that ensures low-speed, high torque and high-speed cutting force, the driving device of coordinate axis, guide rail design, cooling processing technology and precision position measurement technology, etc., and also according to the volume, hardness, geometry and chip removal of the workpiece to be processed, Properly select the number of machining shafts, so that the machine tool has always maintained excellent dynamic performance and stability during the machining process. Even if the number of machine tools required to process a part is the same in the same workshop, the corresponding machine tools should still be selected for processing according to different needs

there are also many articles on the selection of cutting tools in high-speed machining. Generally speaking, the acceleration of the tool and the tool holder should reach more than 3G, the radial runout of the tool should be less than 0.015 mm, and the length of the tool should not be greater than 4 times the tool diameter. According to the actual statistics of sandivk, a famous Swedish tool supplier, when using the titanium carbonitride coated integral cemented carbide end mill (58 HRC) for high-speed machining milling, the linear speed of the tool during rough machining is about 100 meters per minute, while the linear speed during finishing and ultra finishing exceeds 280 meters per minute. In this way, there are high requirements for the material of the tool (including hardness, toughness, red hardness (maintaining cutting performance at high temperature)), the shape of the tool (including chip removal performance, surface accuracy, dynamic balance, etc.) and the service life of the tool

with "high-tech" machine tools (high spindle speed and high feed rate) and high-speed tool systems, people should pay more attention to the processing methods or processes used in high-speed machining to ensure the surface quality of parts and reduce processing time. For example, for the machining of free-form surfaces, it is necessary to ensure continuous movement for as long as possible, so as to carry out high-speed machining on the whole track; For the milling of flat surface parts, a special rough/finish machining strategy is required, which can complete the feeding from the blank and use the coordinate plane to ensure the positioning of the 5-axis machining surface; For aviation workers