It is necessary to introduce some faults of CNC machine tools, analyze the causes and propose the measures to be taken.

Min Key Word CNC Machine Tool Troubleshooting Method Several CNC machine tools owned by our institute are often faulty due to frequent student use and improper operation. Now we introduce several common faults and their causes in combination with practical experience. .

The geometrical angle of the tool used for the high surface roughness of the machined part is unreasonable; 8 the tool material has poor thermosetting properties.

The size of the part is not stable. The bearing at both ends of the ball screw causes the lead screw to move.

When the part processing size is slightly out of tolerance parameter setting, the gap compensation value setting is inaccurate; the pin on the connecting sleeve for connecting the lead screw and the motor shaft is loose.

If the electric tool holder does not rotate, the programming is inaccurate; if the programming is correct and the control circuit is normal, the interface is short-circuited and the fuse is blown.

The electric tool holder is repeatedly positioned inaccurately. There is iron filings or debris between the electric tool holder and the base, and the tool holder is not positioned properly. 2 The nut in the electric tool holder signaling device is loose, causing the brush to be misaligned.

Once the above-mentioned faults occur, you can gradually find the cause and take corresponding measures. For example, the wear on both ends of the lead screw causes the lead screw to sway, resulting in unstable axial radial dimension of the part, and measures for adjusting or replacing the end bearing of the screw can be taken.

The address of the communication address 2210 in Xuzhou City, Jiangsu Province is that there is too much carbon deposit in the supercharger to destroy the rotor balance of the turbo compressor. The compressor casing and the turbine casing can be removed, and the carbon can be removed by a plastic scraper or a brush.

The turbine shell is deformed by collision and repaired or replaced as appropriate.

8 Due to excessive wear of the fully floating bearing, the bearing should be replaced.

The supercharger surges. The main reason is that the air filter is too dirty and blocked, and the intake pipe and the compressor outlet passage are too fouled to block the intake air. If the air flow rate is lower than a certain value, the above components should be inspected and cleaned. At present, these turbocharged high-power diesel engines are equipped with two turbochargers, sharing a common intake manifold. If a cylinder stops working, the turbocharger connected to the cylinder has reduced turbine energy and decreases the speed, but the compressor outlet is open. The back pressure to the intake manifold will not change, which will cause the supercharger to surge. The cause of the cylinder stop should be found and eliminated.

Leaking oil inside the supercharger causes excessive oil consumption. Whether the oil leaks from the turbine or from the compressor, the diesel exhaust will emit blue smoke and even drip oil from the exhaust pipe. Remove the supercharger, check whether the oil return passage of the middle casing is blocked, whether the pipeline is deformed, whether the elastic seal ring loses elasticity or wear exceeds the limit, and the oil seal is damaged. In addition, check if the engine oil is excessively added, if the idle running time is too long, etc., until it is excluded.

Compressor impeller and turbine wheel are damaged. The reason is that there are impurities in the exhaust system, the flange clamp or bolt of the supercharger is loose, the turbine shell is damaged, the journal bearing is worn, the dust is accumulated in the compressor casing, and the carbon deposit behind the turbine impeller is excessive. The shell becomes dirty, the oil filter is clogged, and so on. Disassemble the maintenance booster, remove all impurities, and replace damaged parts.

Editor-in-Chief of Changsha Railway Institute. Construction and principle of internal combustion engines. China Railway Publishing House author unit Tie Shi Bureau Department of Power Equipment Division Communication Address 39, Qingzhou Road, Suizhou City, Hubei Province, 441,300

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