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CAM CAM

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									CAM CAM
CAM (computer Aided Manufacturing, Computer Aided Manufacturing): Using
computers to control production equipment management and operation of the process.
It is part of the process input and process line content, output is the trajectory of
machining tool (cutter location) and the NC program.
CAM (computer Aided Manufacturing, Computer Aided Manufacturing) is the core of
computer numerical control (CNC for short) is the computer manufacturing process
used in the process or system.
1952 Massachusetts Institute of Technology first developed into a CNC milling
machine. NC is characterized by a perforated paper tape by the encoding program
instructions to control the machine. Since then the development of a series of CNC
machine tools, including known as the "processing center"
multi-function machine tools, automatic tool change from the tool library, and
automatically switch the working position, to complete a continuous sharp, drilling,
dumplings, tapping and other multi-channel process These are controlled by the
operation of program instructions, program instructions can be changed as long as the
change process, CNC machining flexibility, such as "flexible."
Processing establishment not only need a lot of labor, and error-prone, the first CAM
is computer aided machining parts programming. Massachusetts Institute of
Technology Research and Development in 1950, CNC machining parts programming
language, APT, which is similar to the high-level language FORTRAN. Enhanced
geometric definition of tool movement and other statements, application of APT to
make programming simple. This computer-assisted programming is batch. CAM
systems generally have data transformation and process automation both functions.
The scope of CAM, including computer numerical control, computer-aided process
design. In addition to application of CNC machine tools, it also widely used to control
other devices, such as punching machines, flame or plasma arc cutting, laser beam
processing, automatic drawing instrument, welding machines, assembly machines,
inspection machines, automatic knitting machine, such as embroidery and tailoring, as
in all the appropriate industry base Jinchu CAM CAM system is graded by computer
control and management structures in many aspects of the manufacturing process, its
objective is to develop an integrated information network to monitor a wide
interrelated areas of manufacturing operations and overall management strategy based
on a control of each operation.
From the perspective of automation, CNC machining is a process automation process,
machining center is a part or all of the parts machining process automation, computer
direct control and flexible manufacturing system is the completion of a family of parts
or different ethnic components of the automated process, The computer-aided
manufacturing of computers into the manufacturing process of such a general concept.
A large-scale computer-aided manufacturing system is a hierarchical structure of
computer network, which consists of two or three computer, the central computer
control of the situation, to provide processed information, the main work of a
computer management, and subordinates computer workstation or mini-computer and
orders and monitor, computer workstation or mini-computers to bear a single process
control or management. The composition of computer-aided manufacturing system
can be divided into two aspects of hardware and software: hardware have CNC
machine tools, machining centers, transportation equipment, handling equipment,
storage devices, detection devices, and computer software have a database, computer
aided process planning, Computer-aided numerical control programming, computer
aided tooling design, computer aided production planning and scheduling, computer
aided quality control. So far, computer-aided manufacturing (CAM, Computer Aided
Manufacturing) has two narrow and broad concepts. CAM refers to a narrow concept
from product design to manufacturing production between all preparatory activities,
which include CAPP, NC programming, time quota calculations, production planning,
project development and other resource requirements. This is the narrow concept of
the original CAM system. Today, CAM's narrow concept even further
reduced to a synonym for NC programming. CAPP has been as a specialized
subsystem, and the calculation of fixed working hours, production planning, resource
requirements planning of development is allocated to the MRP Ⅱ / ERP system to
complete. CAM, including the contents of the broad concept is much more narrow
definition of CAM in addition to the above-mentioned all content contained, it also
includes manufacturing and logistics activities of all relevant processes (machining,
assembly, testing, storage, transport) of surveillance , control and management.
CNC numerical control machine tool control system is part of its spare parts
according to drawing information input, process and process parameters, according to
the way human-computer interaction generated NC program, and then by electric
pulses, and then driven by the servo drive system for machine tool parts the
corresponding movement. Figure 3-4-2 Schematic diagram of the NC system function.
Conventional CNC machine tools (NC), the part of the processing information is
stored on tape in the NC, NC by photoelectric paper tape reader to read the
information on the process control machine tool. Later development of the computer
numerical control (CNC), function was greatly improved, can be a one-time
processing all the information read into computer memory, thus avoiding the frequent
start-up readers. More advanced CNC machine tools can even remove the optical
reader, directly in the computer programming, or directly to receive information from
CAPP, automatic programming. The latter CNC machine tool is a computer integrated
manufacturing system infrastructure. Modern CNC system often has the following
features: (1) Multi-axis coordinated control; (2) location of the tool compensation; (3)
fault diagnosis; (4) online programming; (5) processing, parallel programming
operations; (6) Processing simulation; (7) tool management and monitoring; (8) on
line.
CNC Programming General There are four ways: (1) manual programming; (2) CNC
programming; (3) CAD / CAM system programming; (4) automatic programming.
CNC machining in accordance with pre-programmed procedures, processing of parts
being automatically processed. We line machining process, process parameters, tool
trajectories, displacement, cutting parameters (spindle rpm, feed rate, volume, fed
knife, etc.) and auxiliary functions (ATC, spindle forward and backward, cutting fluid
opening and closing, etc.), in accordance with the provisions of CNC machine tools
and procedures for the instruction code format of processing into a single, then this
procedure a single content recorded in the control medium (such as perforated paper
tape, tape, disk, magnetic bubble memory ) and then input to CNC machine tools
CNC device, which commands machining parts. This analysis from the parts diagram
to control the media made the whole process is called NC program preparation. CNC
machining parts with common difference is automatically controlled machine tools
machining parts in accordance with procedures, and general machine tools to the
people to operate, only if we control the machine movement to change the program
can achieve the purpose of processing of different parts. Therefore, the CNC machine
tools suitable for processing small quantities and complexity of the high accuracy the
shape of the parts as CNC machining parts in accordance with procedures,
programming, staffing a good program then, input to the numerical control device to
command the machine tools.

								
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