COMPUTER-ASSISTED PART PROGRAMMING



In the more complicated PTP jobs and contouring applications, manual part programming becomes an extremely tedious task and subject to errors. In these instances, it is much more appropriate to use the high-speed digital computer to assist in the part programming process. Many part programming language systems have been developed to perform automatically most of the calculations. In computer-assisted part programming, the machining instructions are written English-like statements of the NC programming language. These statements are processed by the computer to prepare the tape. The computer automatically punches the tape in the proper tape format for the particular machine. You can get the best essay on this particular topic and what you need to do is to contact qualified writers for this purpose.

THE PART PROGRAMMER’S JOB

The part programmer’s responsibility in computer-assisted part programming consists of:
·         Defining the work-part geometry.
·         Specifying the operation sequence and tool path

DEFINING THE WORK-PART GEOMETRY

No matter how complicated the work-part may appear, it is composed of basic geometric elements, points, straight lines, planes, circles, cylinders, and other mathematically defined surfaces. It is the part programmer’s task to identify the elements out of which the part is composed. Each geometric element must be identified and the dimensions and location of the element explicitly defined.

SPECIFYING THE OPERATION SEQUENCE AND TOOL PATH

After defining the work-part geometry, the programmer must next construct the path that the cutter will follow to machine the part. It involves a detailed step-by-step sequence of cutter moves. The moves are made along with the geometry elements, which have already been defined. The programmer can use various motion commands to create these movements. You will learn more about the CAPP from papers that you will read or buy from the Research paper writing service.

THE COMPUTER’S JOB

The computer’s job in computer-assisted part programming consists of the following:
  • ·         Input translation
  • ·         Arithmetic calculations
  • ·         Cutter offset computation
  • ·         Postprocessor

Input Translation: The part programmer enters the program written in APT or another language. The input translation component converts the coded instructions into computer-usable form for further processing. Arithmetic Calculations: It is a set of subroutines for solving the mathematics required to generate the part surface and generate tool-path. The arithmetic calculations are performed on the PROFIL file. It frees the programmer from the time-consuming and error-prone geometry and trigonometry calculations. The output of this module is CLFILE. Cutter offset computation: The second task of the part programmer is to construct the tool path. 

However, the actual tool path is different from the part outline. The actual tool path is achieved by offsetting the path from the desired part surface equal to the radius of the cutter.
Post-Processor: NC machine systems are different, they have different features and capabilities. High-level programming languages are not intended for only one machine tool type. They are designed to be general-purpose. The final task of the computer in computer-assisted part programming is post-processing, in which the CLFILE file is converted into low-level code that can be interpreted by the NC controller.

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