implementation plan.
DNC network technology application. Develop a practical management software communication interface.
Reliability CNC test and improvement. According to the requirements of reliability growth, test, record and analyze, provide sufficient and reliable data support for domestic CNC machine tools and CNC system improvement.
The large CNC machining production line has 2 large horizontal CNC milling machines, 1 vertical CNC milling machine, 1 horizontal machining center, 1 gantry machining center and 2 vertical horizontal conversion machining centers. Among the CNC systems, the domestic CNC system accounts for more than 50%. The DNC network delivers CNC machining programs generated by CAD/CAM; it has production scheduling management functions. The information is distributed using a multiplexer.
The production line realizes the automation, intelligence, network and real-time of the DNC production mode through network connection. The networking project includes a Windows98 PC, a taemc320T serial communicator from Taiwan M0XA, a GAT5 shielded twisted pair cable for cable, and a FC232 long-line driver at both ends to solve long-distance transmission reliability problems, using 232 ports and 7 CNCs. The device implements half-duplex communication. The network can transmit the NC code generated by the CAM software to the numerical control device, and can also transfer the used program of the numerical control device to the PC for backup or for another device; the PC hard disk is provided for each device. The folder is stored in the corresponding directory of the NC program used by the machine and the one to be used, so that the call can be transferred at any time. The PC, C32T communication serial port and long-line driver are placed centrally in the central control room. In order to avoid electromagnetic interference, the cable is threaded through the galvanized pipe. The longest transmission distance can reach 12km. The transmission software uses CAM built-in communication software and Each system comes with transmission software, and the software network diagram is as shown.
Equipment, Equipment, Equipment, Equipment During the operation of the production line, we carried out reliability tests on six sets of four equipments using different numerical control systems, and filled in the reliability test report in detail. In the reliability test, a total of 12 general faults occurred, and 2 major faults were accumulated. The average fault-free running time MTBF>500h. In addition to detailed records, we will report to the relevant departments and analyze the reasons in time. The development of improvement measures has greatly improved the manufacturing level of CNC machine tools and shortened the machine tool assembly cycle.
When the company is investing in the DNC production line, it first determines the processing technology of the workpiece to be processed and processes it according to the process route. Optimize the process of the processing object system, combined with CAD/CAM technology application, optimize the workpiece according to the group technology, determine the process plan and implementation countermeasures, make the processing technology scientific and reasonable, processing precision, quality stability, processing efficiency Significantly increased, reducing production costs.
The application of DNC network technology realizes the network processing, control and management of CNC machine tools, automation and flexibility. The development of the production line successfully solved the technical key of our company's machine tool production, filled the blank of the large-scale CNC machining production line of the machine tool industry, and successfully passed the national acceptance in December 2000.
Third, the existing problems and prospects In the case of market changes, product structure adjustment, and shortage of funds, the company has tested the main functions of the book from the self-catering Huakangkang 桦 机 book book book book book book book book book book book book book book book book book book book book book book book book book book book book book book book book
The Cummins engine's PT fuel system is usually tested with special inspection equipment, which often results in: 1 high equipment costs; 2 the removal of the PT system from the engine not only affects production, but also causes new failures due to disassembly and assembly; 3 Diesel engine is not working properly. It is not only the failure of the fuel system, but also the fault diagnosis is wrong, resulting in unnecessary loss. Under this premise, we designed a portable Cummins engine tester.
1. The actual power, speed and temperature of the engine can be measured; 2. Engine PT system parameter measurement and intake pressure fluctuation test; 3. The cylinder compression pressure is measured by the starting voltage drop.
It has a coupling itself (since the photoelectric encoder shaft cannot withstand radial and axial forces), the front end of the coupling is designed with a fork shaft coupled to the engine counter to obtain the engine speed signal.
Type) pressure, PT pump outlet pressure, oil pressure, etc. The sensor has an amplifier and the output voltage signal is DC 1-5V. The output linearity is very good. Connect directly to the PT pump outlet, intake manifold (plus damping), etc.
Maximum speed 5000r/min Output voltage 0.4-5.0V Drive voltage 4.75-13.2V Output pulse rise and fall time 1.0/1S Speed ​​sensor Pressure sensor amplifier Pressure sensor Voltage sensor amplifier Isolated voltage divider Serial communication computer One printer table 2KYB-4 Type pressure converter main parameters output voltage signal 1-5V accuracy 5% power supply 12 ~ 15V pressure overload 150% structure block diagram We selected 51 single-chip microcomputer (CPU is 8031) for development, A / D conversion interface (0809) for analog signal processing, Used to measure voltage, pressure (PT pump pressure, ambient pressure, intake pipe pressure, etc.), temperature (environment, part surface, exhaust temperature, etc.), digital quantity is sent directly to 8031; measured, stored and displayed under program control, Then send the measurement result from the serial communication port to the printer, or send the computer to save the data and draw the curve. For the convenience of use, the equipment power supply adopts the AC 220V or DC 12V and the development of the industry. The research and development of the CNC machining production line of the machine tool has completed the national key scientific and technological research project, but there are still some areas that need improvement. The system state collection 'replenishment is perfect, the transmission software is unified, the computer production management system needs to be improved, and the DNC network needs further expansion.
We will further strengthen the construction of digital network engineering supporting the production line; on the basis of the establishment of CNC special-shaped box parts production line and small and medium-sized shaft sleeve CNC workshop, the integration of modeling, processing, measurement and robot operation will be realized. 4M system, realize rapid manufacturing, rapid measurement, rapid modeling and operation; continue to improve processing production line and DNC network technology, solve existing problems; explore the development direction of CIMS.
1. Measure the cylinder pressure using the starting voltage drop. Since the starter current is proportional to the cylinder pressure, and the starter start current is proportional to the voltage drop of the battery at startup, the large battery voltage drop indicates that the cylinder is at the end of compression; otherwise, the engine power is measured using none. Load accelerating dynamometer method, the inherent coefficient of BP A engine A - the time required for the engine to rise to the rated speed by n, ("takes lOOOr/min") when the throttle is fully open (the time unit is 8) When determining the intrinsic coefficient, first select a new engine, and measure the rated power (as the P value of the formula 1) indicated on the nameplate to determine the A value of the model.
For example, the NH-220-CI diesel engine used in the D-80 bulldozer has a rated power of 132 kW. Under no load, when the engine speed is increased from lr/min to the rated speed of 1850 r/min, it is measured as Ae=0554s. Then /1 = 73.1. Set the 4 value in the test program. When At is measured for the same model engine, the actual power of the engine can be measured by the tester.
3. Since the Cummins engine is equipped with a PT system, the speed sensor and pressure transmission
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