Tag Archive Mold maintenance mode

Mold maintenance mode

Management of mold field use

  1. Dispatchers should go through relevant procedures according to the corresponding management system when collecting and returning the molds, and be responsible for the whole process of the molds from receiving to returning.
  2. The die should be processed according to the stamping process and the corresponding tonnage of punch press. The mold should be adjusted and installed by the mold adjuster, and ensure that the leakage is smooth, the spring top is normal, the feeding is convenient, the stroke is reasonable, and the production can be started after the qualified sample is tested.
  3. The punch operator shall strictly follow the operation procedures. If any abnormal phenomenon is found in the production process, it should be reported in time, and the production can be carried out after troubleshooting. In case of mold damage caused by barbaric operation, the responsible person shall fill in the mold accident liability sheet and give certain punishment.
  4. In case of die waste fracture, guide plate guide deformation, die and punch damage caused by pressing and bending die stuffy, it is necessary to trace the responsibility of the adjuster.
  5. The usage of the mould shall be clear during the shift handover of day shift and night shift. The successor shall be responsible for the accident after the handover.
  6. After the completion of the production task, the dispatcher shall be informed in time to handle the warehouse return procedures. The production site should not keep the mold without production instructions or complete the batch task. If the mould is lost, the responsibility of the final receiver will be traced.

Purpose of mold maintenance system

  1. Master the history of the mold 2. Maintain the mold in time after mold production 3. Improve the service life of the mold 4. Ensure the quality of the mold and smooth production

Mold maintenance mode mold maintenance is divided into four modes

  1. Preventive inspection: take every 15 days as a cycle to check the mold status directly on the production machine, and record the results in the “mold preventive inspection record form”. This part of the inspection is in the charge of the mold group, assisted by the injection molding department.
  2. General maintenance (A-level maintenance): it refers to the general maintenance items of the mold during the daily mold test and trial production, which are responsible and recorded by the production department.
  3. Regular quantitative maintenance (B-level maintenance): when the mold has not been used for more than one year or has accumulated more than 50000 beer each time, detailed inspection shall be carried out, and the inspection results shall be recorded in the “mold maintenance inspection record form”. The production department is responsible for and records.
  4. Mold maintenance (C-level maintenance): when the injection molding material has serious appearance problems or the mold is damaged, the parts need to be replaced or repaired.

The motor does not run;

Switching power supply (± 15V) transformer TL and power switch tube v69 are abnormally hot.

This is a typical case of syndrome, and there may be some causal relationship between the faults, so we need to deal with the faults in sequence, otherwise we may get twice the result with half the effort, or even cause the fault area to expand. Through the analysis, we make the following maintenance order: switching power supply one > under voltage light > motor running. Firstly, check the power supply board. After measuring the 150V DC voltage of the main circuit and disconnecting the ± 15V load, we know that the fault is inside the switching power supply board. In the check of the power supply board, we find that the voltage of the 10V regulator V32 is only 9.5v. From this, we can find the cause of the fault: the current limiting resistance rl85 of V32 becomes larger. After replacing rl85, the ± 15V power board and “under voltage” lamp returned to normal, but the motor still did not run. It can be seen that the above flashing lights and hot components are caused by rl85 variation, and there is another reason for the motor not running. According to the usual inspection method, it can be detected step by step, but due to experience, we only did a simple transformation and steering test, and found that the reverse operation was normal, so we quickly found out the cause of the fault: the integrated block N5 (tl084) of the commutation circuit failed, and everything was normal after replacing N5

  1. PC interface method

Because the signal transmission and control between each unit (except driver) of NC machine tool and NC system are realized through PC interface (1 / O), many faults will be reflected through PC interface signal. We can diagnose various complex machine tool faults or judge whether the fault is in NC system or in machine tool electrical by consulting 1 / O signal of PC machine tool side. The method is very simple, that is, it is required to be familiar with the current state and normal state of all PC (machine side) interface signals (or make a table). During diagnosis, check and compare the current state and normal state of all PC (machine side) interface signals one by one to find out the faulty interface signals, and then find out the fault causes according to the external logic relationship of the signals. When you are familiar with the PC interface signal, the application of this PC interface comparison method is very simple and fast, and avoids the complicated ladder program.

  1. Recovery of abnormal data in Siemens 3GG system

The grinder s45-6 of Switzerland is equipped with Siemens 3GG system, which is a dual n C dual PLC structure. The system has a strong self diagnosis function. When a fault occurs, it can quickly diagnose and repair the fault with the help of the screen prompt. However, if the system cannot be started, and the PLC is in the stop state, the screen is not bright, then the self diagnosis function of the system will not play a role, leading to the difficulty of diagnosis. If the battery voltage is lower than 2.7V, the battery must be replaced; if the NC or PLC hardware is damaged, the circuit board needs to be replaced; if the 24 V power supply of the machine tool is lower than 21 V, the power supply circuit and load need to be checked.

But we encounter more faults, the reason is not the hardware fault, but the machine data abnormal such as soft fault. The reasons are complex, such as power grid interference, electromagnetic wave interference, battery failure, operation error and so on, which may cause the loss or confusion of machine data, so that the system can not start.