Fifteen Recommendations for the Maintenance of Injection Mold

- Oct 10, 2019-

Injection molds are more complex and precise in structure than other molds, and require higher requirements for operation and maintenance of products. Therefore, during the entire production process, the use of positive solutions and careful maintenance and maintenance will maintain normal production in enterprises and improve their efficiency. Is of great importance.
Fifteen Recommendations for the Maintenance of Injection Mold
First, select the appropriate molding equipment and determine the reasonable process conditions. If the injection molding machine is too small, it can not meet the requirements. Too large is a waste of energy, and it will damage the mold or template due to improper molding force adjustment. At the same time, it reduces efficiency.
When selecting the injection machine, the maximum injection volume, effective distance of the pull rod, the mold installation size on the template, the maximum mold thickness, the minimum mold thickness, the template stroke, the top out mode, the top out stroke, the injection pressure, the mold force, etc.. Verification, Use only after full request. The reasonable determination of the process conditions is also one of the contents of the correct use of the mold. The locking force is too large, the injection pressure is too high, the injection rate is too fast, and the mold temperature is too high.
Second, after the mold is installed on the injection machine, the empty mold operation must be carried out first. Observe the flexibility of the operation of its various parts, whether there are abnormal phenomena, top trip, whether the opening trip is in place, whether the die time pattern surface is in strict alignment, and whether the plate screw is tightened.
Third, when the mold is used, it is necessary to maintain a normal temperature and work at a normal temperature, which can extend the life of the mold.
Fourth, sliding parts on the mold, such as guide posts, paper clips, push rods, type cores, etc., should be observed at any time, regularly checked, timely scrubbed and greased, especially when the summer temperature is high, each shift is added at least twice. In order to ensure that these sliding pieces are flexible in motion, to prevent tight bite death.
5, each time before the mold, should pay attention to whether the type of cavity is clean, absolutely not left with residual products, or any other foreign matter, when cleaning, it is strictly forbidden to use hard tools to prevent touching the cavity surface.
Sixth, the mold with special requirements on the surface of the cavity, the surface roughness Ra is less than or equal to 0.2 cm, and it must not be rubbed with hand or cotton wire, blown with compressed air, or gently rubbed with alcohol with advanced napkin paper and advanced skim cotton.
Seventh, the surface of the cavity should be cleaned regularly. During the molding process, the injection mold often decomposes low-molecular compounds and corrodes the mold cavity, making the shiny cavity surface gradually dim and reducing the quality of the product. Therefore, it needs regular scrubbing. Scrub can be used alcohol or ketone preparation after scrubbing to dry in time.
When the operation needs to be temporarily shut down, the mold should be closed, and the mold cavity and core should not be exposed to prevent accidental damage. The downtime is expected to exceed 24 hours. Rust-resistant oil or demoulding agent should be sprayed on the surface of the cavity and core. Especially in wet areas and rainy seasons, the time is shorter and rust-proof.
Water vapor in the air will reduce the surface quality of the cavity and the surface quality of the product will decrease. When the mold is used again, the oil on the mold should be removed and can be used only after cleaning. After the cleaning compressed air required by the mirror is dried, it will be dried with hot air, otherwise it will seep out during the molding and cause defects in the product.
9, temporary stop after the boot, after opening the mold should check whether the slider limit is moved, no abnormal found can be mold. In short, must be careful before booting, not careless.
In order to extend the service life of the cooling water channel, when the mold is out of service, the water in the cooling water channel should be immediately cleared with compressed air, put a small amount of oil into the mouth of the mouth, and then blown with compressed air to provide all cooling pipelines with a layer of anti-rust oil layer.
Eleven, during the work carefully check the working status of each control component, strictly prevent abnormal auxiliary system, heating, control system maintenance is particularly important for the heat flow mold. At the end of each production cycle, rod heaters, belt heaters, and thermocouples should be measured using ohms and compared with the technical specifications of the mold to ensure its function is intact. At the same time, the control loop may pass the meter test installed in the loop. The oil in the hydraulic cylinder used for pumping core is emptied as far as possible, and the nozzle is sealed so as not to leak or pollute the surrounding environment during storage and transportation.
If you hear any noise from the mould or any other abnormal situation during production, you should stop work and check immediately. Mold maintenance personnel to the normal operation of the mold in the workshop to conduct a tour inspection, found abnormal phenomena, should be timely handled.
13. In addition to the handover of production and the crucial key records of the process, the operator must also explain in detail the use of the mold.
When the mold completes the production quantity of the products, when the machine is to replace other molds, the mold cavity shall be coated with rust inhibitors, the mold accessories shall be sent to the mold maintenance staff, and the final model production qualified products shall be sent to the maintenance staff as samples. In addition, should also send a mold use list, fill out in detail the mold on which machine tools, from a certain year or a certain date, a total number of products produced, the mold is now good. If the die has a problem, what is the problem of filling in the die on the use list, put forward the specific requirements for modification and improvement, and hand over an unprocessed sample to the custodian for reference when the mold repair die.
Should set up a mold library, set up a person to manage, and establish a mold file, if possible, to implement computer management of the mold. The mold library should choose a place where the moisture is small and ventilated. The temperature should be kept below 70 %. If the humidity exceeds 70 %, the mold can easily rust. The mold should be stored on the shelf, pay attention to corrosion prevention, dust prevention, etc.. To mark the need to repair or complete repair, maintenance.