Application of the hottest CAXA Manufacturing Engi

2022-07-23
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Application of CAXA manufacturing engineers in NC machining and manufacturing I. Introduction at this stage, many factories often use 2D design software to design 2D based plan parts, and then the technologists/programmers directly use G code or apt language for NC programming according to 3D concept. This method is applicable to plane machining, linear machining, revolving body machining and point machining of general simple parts. Its programming speed is fast and the code is simple. For complex geometry, fixture assembly, especially for non-circular surface machining, the above programming method is very difficult

because of the large amount of calculation and complex process of mathematical processing of spatial geometry and trajectory, it is difficult to master, and the spatial relationship between the geometry of the elements of the processing environment cannot be checked during the programming process. The tool position coordinate is converted into the geometric figure of the machining object for inspection. The accuracy is low and not intuitive. Therefore, the machine debugging program is required, which takes up the working hours of the NC machine tool and the technical preparation cycle is long

in recent years, CAM technology has developed rapidly, the graphics processing function has been greatly enhanced, and the price of hardware platform has dropped significantly. At the same time, cad/cam software technology is becoming more and more mature. This makes the domestic cad/cam software CAXA manufacturing engineers, which directly converts the geometry information of parts into NC machining programs, popularized and applied

II. Cam NC machining technology

1 Overview of cam NC machining

cam NC machining technology is based on the integration of tool library building, fixture library building, NC modeling and CAD solid modeling, to establish the machine tool machining environment in the computer, set parameters according to the machining process scheme, simulate the actual cutting process of the machine tool, carry out tool interference inspection, and finally generate NC code file, that is, G code, which is input into the machine tool to complete part machining. The key technologies are as follows:

(1) the establishment of fixture library, the assembly of multi station fixture and the switching between processes

(2) the establishment of the assembly tool library and its transfer in the process of simulation cutting

(3) application debugging of NC modeling system

(4) use the series tool elements and fixture elements in the tool and fixture database of CAM software to process the blank model

(5) simulate the machining trial cutting process and check the cutting interference

(6) modify the tool path

(7) apply software functions to generate tool, fixture and component assembly drawings and tool path diagrams, and output various process information and reports

2. Using CAXA manufacturing engineers to realize NC machining

caxa manufacturing engineers, based on the geometric information of parts generated by CAD, use the method of man-machine interactive dialogue to specify the geometric features of the machined parts on the computer screen, define the relevant machining parameters, process the data by the computer, dynamically display the machining path, and finally output the NC code data, especially the simulation cutting function it assumes to provide, It can simulate the machining environment for cutting and check whether the tool interferes

the process of realizing NC machining with CAXA Manufacturing Engineer is shown in Figure 1

Figure 1 CAXA Manufacturing Engineer's NC machining process

III. process processing based on CAXA Manufacturing Engineer

1 The main functions of the CAXA Manufacturing Engineer manufacturing function module

caxa manufacturing engineer is a cad/cam integrated domestic CAM software combining curved surfaces and solid bodies. It is a software package based on 3D part design, manufacturing and analysis. Its manufacturing function module mainly has the following functions:

(1) ensure the uniqueness and relevance of data

if a part model is modified, the assembly drawing and part drawing related to the part will be automatically updated

(2) strong ability to design processing environment

can simulate processing conditions and establish three-dimensional assembly fixture assembly, tool assembly and processing blank series; Graphic interactive man-machine dialogue; There are many kinds of feed modes, which can automatically generate the machining tool path. Capable of milling, boring, turning, reaming, wire cutting and other processing. Each processing provides a variety of processing methods; The tool path can be displayed graphically; The screen simulates the actual cutting process, displays the material removal process and checks the tool interference; It can provide complete process information. It can provide tool assembly, installation and use information, fixture installation and use information, machine tool use information, process parameter setting information, etc

2. The process of using CAXA manufacturing engineers to perform process analysis and machining on CNC machine tools

based on the technical support of CAXA manufacturing engineers, the process of performing part processing process analysis and machining on CNC machine tools can be divided into the following stages:

(1) preparation work

in this stage, the main work is to complete the design of processing environment, that is, on the premise of completing the process scheme design, The CNC machine tool parameter setting, tool component library building, tool assembly, general fixture component library building, special fixture component modeling, fixture assembly, etc. are completed on the computer in order to establish a three-dimensional workpiece processing environment

(2) workpiece model modeling design

using the plane drawing functions such as lines, arcs and splines provided by caxa-cad and the solid modeling functions such as stretching, material removal and lofting, the design elements can be processed and mixed to model the three-dimensional machining data, and the workpiece can be expressed by curves, surfaces and entities. In the process of part modeling, the three-dimensional design function provided by the software can be directly used to make it become a plane energy parallel to each other and perpendicular to the cylinder axis of the specimen hole, or the parameter lines and other elements in the two-dimensional drawing can be introduced into CAXA modeling to realize the accurate exchange of CAD data, generate a three-dimensional data model that meets the NC machining, and realize the three-dimensional solid modeling design of complex parts. An example is shown in Figure 2

Figure 2 five pointed star three-dimensional solid modeling

(3) processing scheme design

analyze the three-dimensional modeling of the above parts, and select the most suitable processing method according to the requirements of the process scheme, the spatial geometric relationship between the part blank and fixture assembly, and the tool characteristics and parameters. Carry out further process analysis on the solid modeling, modify and supplement the modeling according to the processing properties, determine the three-dimensional solid surface to be processed according to the processing characteristics and processing capacity, then analyze the composition of the solid, draw up the entry path, cutting path and exit path of the tool, find the parts where the tool may interfere in the movement, and adjust the processing environment in time

(4) generate machining path

according to the shape characteristics and process requirements of the parts to be machined, use the surface, guide, parameter line, projection and other advanced machining methods provided by CAXA manufacturing engineers to flexibly select the solid parts to be machined, input the relevant data parameters and requirements, and quickly display the graphics, generate the tool path and tool cutting path. An example is shown in Figure 3

Fig. 3 machining path of Pentagram

according to the characteristics of different machining properties and machining parts of the entity, different machining methods are used to generate different rough and finish machining paths. The programmer can flexibly select the machining position and method according to the actual needs. After the machining path is generated, the related path is and modified by using the functions of tool position, path connection and interruption, and parameter modification. Using the trajectory simulation function, you can simulate the actual cutting process on the screen, display the material removal process and check the tool interference, check whether the generated tool path meets the requirements of cultivating and expanding the new material industry, and check the workpiece section after cutting to ensure that there is no overcut. Examples are shown in Figures 4 to 5

Figure 4 screen simulation of cutting process

Figure 5 Simulation of machining results

(5) generation of G code

the core work of NC programming is to generate tool path, then discretize it into tool points, and generate NC machining program after post-processing. After the machining path is generated, according to the configuration requirements of the current machine tool type, the generated tool path is automatically converted into the appropriate NC system machining G code, that is, CNC NC machining program. However, different machine tools have different CNC systems. Different CNC systems have different G code functions and different processing program formats. Therefore, the G code should be post processed to correspond to the corresponding machine tools. Using the post-processing function of the processing process parameters of the software, the main feature of the first dentalmodel is high precision. It can be modified to make it suitable for the requirements of the NC system of the machine tool, or customized according to the format specified by the machine tool. After customization, the settings can be saved for future matching with such machine tools

After the

g code is generated, the processing operation sheet can be automatically generated as required. The program will automatically calculate the processing time of each processing step according to the parameters in the preparation of the processing track, which is very convenient for production management identification and processing hour calculation. We can also verify the quality of processing technology and code through intuitive processing simulation and code reverse reading

(6) g code transmission and machine tool machining

the generated G code should be transmitted to the machine tool. If the amount of programs is small and the memory capacity of the machine tool allows, the G code program can be transmitted to the machine tool at one time. If the amount of programs is huge, DNC transmission is required, and the G code is directly connected with the machine tool through the computer standard interface. On the basis of not occupying the machine tool system memory, the computer can directly control the machining process of the machine tool. The machine tool can perform DNC processing or separate processing according to the received G code processing program

IV. conclusion

we used CAXA manufacturing engineers to carry out numerical control machining on the sample parts. The tool path design was reasonable and correct, and the machining was performed successfully once. Compared with the traditional hand programming NC machining, it has the following characteristics:

(1) on the computer screen, facing the geometric figure of the part, operating the object with the mouse and using the relevant menu for programming design. The method is simple and easy to learn

(2) the programming result is intuitive, displayed on the screen by the tool path, and the processing speed is fast. Through simulation cutting and tool interference checking, the program is successful at one time, and the adjustment time and trial cutting time of the machine tool are greatly reduced

(3) the program debugging time is reduced, the machine tool man hour occupation is reduced, and the production cycle is shortened

(4) adopting numerical control technology can not only shorten the production cycle, but also avoid multiple clamping, improve the machining accuracy, improve the machining accuracy and the ability to process complex parts. (end)

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