enerally refers to the injection molding machine or system reduce or loss the function what it should be. The injection molding machine’s function reflects machine’s valve and Level of assurance during the plastic injection molding processing. In the modern production of injection molding machine, as because of injection molding machine’s complicated structure, high requirements of automation, hydraulic, electronic control and mechanical contact is very close, so injection molding machine failure, even a partial failure, will result in the injection molding machine shutdown. Injection molding machine failures directly affect the quantity and quality of products. A.Injection molding machine failure are varied. B.Analysis and troubleshooting procedures injection molding machine failure. In order to do the fast troubleshooting injection molding machine, to ensure the efficient, effective, must follow certain procedures, this procedure is as follows: Analysis of the symptoms with the maintain of the spot a. Get some information from the operator 1. What failed? Under what circumstances did it happen? When did it happen? 2. Injection molding machine has already started running for how long? 3. Whether there is any anomaly before the failure? What sound or light alarm signals? Without smoke or smell? Whether the misuse? 4. Control system operation is normal? Whether there are any changes in operating procedures? In operation, whether there are special problems or unusual? b. Observe the whole situation, the operating parameters 1. Whether the apparent anomaly? Parts without jamming or damage? Whether hydraulic system loose or leak? Wire without rupture, abrasion or burn? 2. Injection molding machine operating parameters change? Is there any significant interference signal? Is there are any inidication singnal of damage? c. Check the monitor indicating device 1. Check that if all readings are normal, including pressure gauges and other instruments readings, oil level situation. 2. Check if the filter, alarm and interlock devices, motor output or display is correctly. d. Check the condition of intermittent, history lasting condition, fast forward or slow into the circumstances to see whether in these circumstances affect the output or it may cause damage or other hazards. Check the injection molding machine (including parts, components and circuits) a.By sensory inspection (to continue in-depth observation of the process) 1.view: if plug or socket is exception, the motor or the pump is functioning properly, the control to adjust the correct position, with or without signs of arcing or burning, fuses quality, liquid leaks, if the lubricating oil is going smoothly and so on. 2.touch: vibration of injection molding machine, temperature of the components and the tubing, the state of mechanical movement. 3.Listen: If there is any special noise. 4.smell: If there is any special smell of burning- 5.checking: The mechanical components postion and shape, the paramters changes, the circuit exception checking. b.Evaluation of test results Whether the assessment of fault diagnosis is correct, whether has found the clues of failure or all test results are the same. Determination of fault location Recognition system to determine the structure and test method Search from the injection molding machine manual to find which structure of the injection molding machine, check from the manual to see that by using which kind of testing to get performance parameters. And the testing should under what operating conditions. If there is the operating permit need to be applied because of the safety measures. System detects Use most suitable detect to the system structure. In the appropriate test points, if the results based on input and feedback or performance standards with the normal compared to identify suspicious locations repair or replacement 1. Repair Find the cause of the malfunction, repair faults for injection molding machine to take preventive measures; check the relevant parts, to prevent trouble spreading. 2. Replacement The correct replacement parts assembly debugging, and attention to the relevant parts. Replaced parts for repair or scrapped. Performance testing 1. Start injection molding machine After the start assembling parts injection molding machine commissioning, first manually and then no-load and load determination. 2. Adjust the rate of load change from low to high, the load from small to big, the system pressure can not exceed 140kg/cm2, determination of the required standards performance. 3. To expand the scope of performance tests Necessary, gradually expanding from the local to the system performance test range. Note that the health of non-fault zone system. If performance is delivered to meet requirements, such as not meeting the requirement is to re-determine the fault position. record and feedback 1. Collection of valuable information and data, such as injection molding machine failure time, failure phenomena, downtime, repair time, repair replacement parts, repair results, the problem to be solved, settlement costs, according to the requirements kept on file . 2. Statistical Analysis Regular analysis of injection molding machines used to record, analyze downtime, revision notes directory, looking for the key measures to reduce the maintenance work, study the failure mechanism, suggest improvements. 3. According to the procedure of the fault reported to the competent department of the feedback, and feedback to the injection molding machine manufacturing units.