Fifteen suggestionsthe maintenancemaintenance of injection moulds
2018-06-12 07:12:49
First, select the appropriate molding equipment and determine the reasonable process conditions. If the injection machine is too small, it can not meet the requirements, too big and is a waste of energy, and it will damage the mold or template because of the improper adjustment of the mould force and reduce the efficiency at the same time. When the injection machine is selected, the maximum injection amount, the effective distance of the drawing rod, the mold installation size on the template, the maximum die thickness, the minimum die thickness, the template stroke, the ejection way, the ejection stroke, the injection pressure, the clamping force and so on are checked. The reasonable determination of the process conditions is also one of the correct use of the content of the mold, the clamping force is too big, the injection pressure is too high, the injection rate is too fast, the mold temperature too high will cause damage to the mold service life. Two, after the mold is loaded with the injection machine, the mould should be operated first. Observe whether the operation of each part is flexible, whether there are abnormal phenomena, the top out of the stroke, the opening of the stroke is in place, whether the mode is close and the plate screw is tightened. Three. When the mould is used, keep normal temperature and work at normal temperature, it can extend the service life of the mould. Four, the sliding parts on the mold, such as the guide column, the back needle, the push rod, the core and so on, should be observed at any time, the time check, the timely scrubbing and filling the grease, especially when the temperature is high in the summer, at least two times per class, so as to ensure the flexible movement of these sliders and prevent the tight and astringent death. Five, each lock before the mold, should be paid attention to, the cavity is clean, absolutely no residual products, or any other foreign objects, the cleaning is strictly prohibited to use hard tools, in order to prevent the surface of the wound cavity. Six, the surface of the cavity surface has special requirements, the surface roughness Ra less than or equal to 0.2cm, absolutely can not use hand or cotton wipes, compressed air blowing, or advanced napkins and advanced skimmed cotton dipped in alcohol gently wipe. Seven, the surface of the cavity should be cleaned regularly. The injection mold often decomposes the low molecular compound corrosion mold cavity during the molding process, which makes the bright cavity surface gradually become dark and dull and reduces the quality of the products. Therefore, regular scrubbing is needed, and the scrubbing can be dried in time after scrubbing with alcohols or ketones. Eight, when the operation is left to be temporarily shut down, the mold should be closed, and the mold cavity and core should not be exposed in order to prevent the accidental damage. The stopping time is expected to exceed 24 hours. Rust oil or mold release agent should be sprayed on the surface of the cavity and core, especially in wet areas and rainy seasons. The water vapor in the air will reduce the surface quality of the mold cavity and reduce the surface quality of the products. When the mold is used again, the oil on the mold should be removed and cleaned before it can be used. The cleaning compressed air, which is required by the mirror, is blown dry with hot air after drying. Otherwise, it will exudate in molding and make the products defective. Nine. After the machine is temporarily stopped, turn on the machine. After opening the mold, check whether the position of the slider is moving or not. In short, we must be cautious and not careless before starting. Ten, in order to prolong the service life of the cooling water channel, when the die is disused, the water in the cooling channel should be removed immediately with compressed air, and a small amount of oil is put into the mouth of the nozzle, and then the compressed air is blown, so that all the cooling pipes have a layer of antirust oil. Eleven, work carefully to check the working state of the control components, prevent the auxiliary system from abnormal, heating, and the maintenance of the control system is particularly important for the hot runner mold. At the end of each production cycle, the rod heater, the belt heater, the thermocouple are measured by the European mother and compared with the technical specifications of the mold to ensure the good function. At the same time, the control loop may be tested by an ammeter installed in the loop. The oil in the hydraulic cylinder of core pulling is emptied as far as possible, and the oil seal is sealed, so as to avoid the leakage of hydraulic oil in the course of storage and transportation or to pollute the surrounding environment. Twelve, in the production heard the mold sound or other unusual circumstances, should immediately stop the inspection. The mould maintenance personnel should carry out circuit inspection to the normal running mould in the workshop, and find that abnormal phenomena should be dealt with in time. Thirteen, in the handover shift, the operator should detail the application of the mould in addition to handover and production process. Fourteen. When the production quantity of the mould is finished, the mould should be coated with antirust agent in the mold cavity to replace the other mold. The mould its accessories should be sent to the mold maintenance staff, and the final mold production products are attached to the maintenance staff together. In addition, it should also be sent to a list of mold use, in detail how the mold is on the machine tool, and how many quantities of products are produced in a certain day and a day of a year, and now the mold is good. If the mold has a problem, it is necessary to fill in the mold on the use list, put forward the specific requirements for modification and improvement, and give the untreated samples to the depository, leaving the mould workers to repair the mold for reference. Fifteen, we should set up a mold library, set up special personnel management, and set up mold files, if possible, to carry out computer management of the mold. The mold library should choose the place where the moisture is small, the temperature should be kept below 70%. If the humidity exceeds 70%, the mold is easy to rust, the mold should be stored on the shelf, and the corrosion prevention and dust prevention should be paid attention to. Mark the need to repair or complete repairs and maintenance.
