数控机床英文文献和翻译 Development of ISO14649 Compliant CNC Milling Machine
Operated by STEP-NC in XML Format
ABSTRACT
G-code, another name of ISO6983, has been a popular commanding language for operating machine tools. This G-
code, however, limits the usage of today's fast evolving high-performance hardware. For intelligent machines, the
communications between machine and CAD/CAM departments become important, but the loss of information during
generating G-code makes the production department isolated. The new standard for operating machine tools, named
STEP-NC is just about to be standardized as ISO14649. As this new standard stores CAD/CAM information as well as
operation commands of CNC machines, and this characteristic makes this machine able to exchange information with
other departments. In this research, the new CNC machine operated by STEP-NC was built and tested. Unlike other
prototypes of STEP-NC milling machines, this system uses the STEP-NC file in XML file form as data input. This
machine loads information from XML file and deals with XML file structure. It is possible for this machine to exchange
information to other databases using XML. The STEP-NC milling machines in this research loads information from the
XML file, makes tool paths for two5D features with information of STEP-NC, and machines automatically without
making G-code. All software is programmed with Visual C++, and the milling machine is built with table milling
machine, step motors, and motion control board for PC that can be directly controlled by Visual C++ commands. All
software and hardware modules are independent from each other; it allows convenient substitution and expansion of the 本文来自优'文)论'文`网，毕业论文 www.youerw.com 加7位QQ324~9114找原文
milling machine. Example 1 in ISO14649-11 having the full geometry and machining information and example 2 having
only the geometry and tool information were used to test the automatic machining capability of this system.
Key Words : STEP-NC, XML, PC, milling machine, open architecture, tool path
1. Introduction
Various packages of software adapted to the
hardware of high performance are developed and used
widely in production departments. However, in the
machining department, operation commands of ISO6983
called G-code that was standardized in the early days of
NC machine development is still used, and all operation
software and interface are customized to this standard.
This standard only describes the motions of tools and
miscellaneous commands for the machines, so following
problems arise from using G-code.
z Long command lines of simple geometry
z Unintuitive commands - commands are written in
single alphabets and two digit numbers
z Difficult exchange of information between
departments due to the lack of G-code information -
isolated machining department due to lost CAD and
CAM data
z Difficult updates and reusability of the command
lines - update commands of G-code are different
among NC machines companies.
To overcome these problems and use new abilities of 3501
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