联系方式

联系电话:0574-65332902 
邮箱:nhsheji@nbnenghai.com 
传真:0574-65332900 

Die Maintenance

发布日期:2015-04-07

Storage and management of injection mold
Injection mold a limited life span, table, but the correct use can greatly extend its life. These methods may be maintenance, storage, management classification.
                Different mold materials can be molded part number
        Material
     Formable number
      Remark
       Zinc Alloy
       100100
      Casting
        Aluminum
       100100
      Casting
        Aluminum
    100100-200000
     Die Casting
       Beryllium copper
    250000-500000
     Surface hardening
       Steel
    500000-1000000
 
 
 
 
In order to make the molds can be used as soon as possible, we must look to meet the requirements of storage and precautions.
1) Each mold during storage should be and a molded element and its own mold cards together, and there is space for easy handling.
2) Only available ready, complete, clean mold can be stored. Meanwhile reservoir forming member (usually a production process of the final molded plastic parts) and writing a card number of the file number and the mold, the mold is to be uniquely identified.
 
 
Mold card information should be written on all mold injection molding equipment required, including:
⑴ mold design;
⑵ size molds and molded parts;
⑶ die mounting means;
⑷ suitable for the production of injection molding machines;
⑸ injection amount (injection volume);
⑹ suitable plastic;
⑺ material pretreatment requirements;
⑻ mold temperature and heat control media (water, oil, etc.);
⑼ cycle time;
⑽ injection pressure, the system pressure, dynamic pressure source;
⑾ injection speed;
⑿ screw speed;
⒀ cylinder device;
⒁ maintenance intervals;
⒂ number of plastic parts production.
This information can be expanded according to the specific needs of the plant, most of this information, such as injection machinery installation, you can not record on the card, and can be stored in an external data medium, before production began to read into a computer.
 
If you move out of storage at the die immediately available, then you need to read fast mold adjustment is complete, without the need for more work to assemble and clean. Each mold should be kept separate unit, that can not be shared with other parts of the mold. Lending or borrowing of parts or components are often lost, or were occupied in arranging the rest of the mold when, if this happens then the consequences are incalculable and would waste production time.
 
Cleaning work will delay production time, it should be completed in a time, it is necessary to mold a special management and storage, clean, especially around the environment with special requirements. Wet room can cause mold corrosion, rust Once the mold, repair will be very time consuming and expensive, and often can not be repaired. Therefore, the mold should be stored at a constant temperature, dehumidification place, not all require this, but it is worth it.
 
Storage space for extracting mold is also very important, especially depending on the vehicle (such as forklifts) used in the factory and maneuvering space.
 
After the end of the work, the mold will be used again if possible, it should be returned to the storage place. Its production of the last part can prove its current state, must carefully examine their dimensional stability, confirm the status of the mold surface, the sealing of the horizontal mold parting surface (may be a flash in the parting surface) and the top of the operation state agencies. If you do not find defects, maintenance work can be performed in accordance with the general method mentioned below.
 
1. The cooling circuit Maintenance
Cold heat medium passage must be thoroughly cleaned to remove scale, rust and sludge, since these deposits reduced media path, to measure a flow rate is one method of checking the system. Pressure control valve is installed between the mold and the media path, and set up a pressure differential, flow rate for each of the detection should be the same. Comparative data measured after the completion of the production can provide some information about the channel is blocked.
 
To clean, wash with detergent often within the hot and cold media channels, mechanical cleaning sediment because of the geometry of the channels can not be carried out, there are many manufacturers offer special cleaning agents and cleaning equipment.
 
Nipple, brackets, bolts and intake pipes and other parts of the mold should also check out the extent of damage, decide whether you need to replace, to ensure they are fixed on the mold. Before storing the mold with compressed air drainage, and drying with hot air cooling system.
 
2. The management and maintenance of the mold surface
At the end of production, the mold must be carefully cleared inside plastic residue, irrespective of the type of the work and the mold material. Proposal with soap and water to remove residual materials and other deposition, after carefully drying the mold. Before storing water and also remove invasive rust condensed material left, according to the degree of chemical attack, you can use abrasives or polishing agents to eliminate rust. Cleaning work also includes clearing the mold moving parts residual lubricant.
 
3 management and maintenance of heating and control systems
This work is particularly important for hot runner mold. During production, are applied ohm meter to check the heat carrier, heater and thermocouple and compared with the contents of the mold on the card, but also to ensure the circuit is connected and working properly insulated leading wire splint.
 
4 sliding rail management and maintenance
In the mold parts rails require special cleanup and must be free of lubricants resin and acid; tightness of the hydraulic slide cores need to check the hydraulic cylinder.
 
5 gating system management and maintenance
First check the nozzle contact area, in the operation of the load is very high here, and then check the other belongs to a special nozzle mold. Pouring temperature controlled injection system does not have a release every time, depending on whether it is necessary plastic molding process, working with a wide range of plastic washing gating system until the end of production.
 
6. Management before storage
At each end of the maintenance work, the mold should be carefully dried and lightly coated with creosote, which is especially important for the movable parts such as pusher assembly, slider, lifter. If the long storage time, use greaseproof paper wrapped mold. In the case of non-compliance with the storage conditions, and the use of oil-paper parcel grease mold is especially important. For all observations and maintenance work should be written in the mold mold card.