10 factors influencing the quality of injection mold
Mold manufacturing is a complex process, from the design, processing, assembly, debugging and other steps to the actual use, in the whole life cycle, the factors that affect the quality of the mold mainly have the following 10 aspects.
1. Mold steel
Steel is the decisive factor of mold quality, choosing reasonable steel is the most important.The criteria for choosing steel are:
Iv injection material requirements
Different plastics should choose different steel, such as high polish requirements, corrosion resistance requirements, and so on;
(2) the price
Steel performance is good enough, not the more expensive the better;Considering the cost factor of the mold, the steel of the mold should be selected and the corresponding material of the mold life to avoid unnecessary waste.Generally, the life of P20 material is about 300,000;Material of 2738 is at 500,000 no problem, h13/2344 is usually above 80-1 million, can choose according to the circumstance;
Surface finish
Mold surface treatment is also very important.Nitriding can enhance the surface hardness of steel and prolong the die life effectively.Electroplating can effectively modify die steel, and electroplating can be used to enhance and improve properties of some plastic parts requiring high brightness and corrosion resistance.
2. Structural design
Mature mold structure takes into account not only product material properties, shrinkage rate, molding temperature, elastic tensile deformation coefficient, but also cooling water channel, opening and closing speed.Reasonable die structure can effectively prolong die life and ensure the smooth production of die, improve efficiency and reduce cost.
3. Mold processing
He that would do well to his work must have his tools first.The arrangement of die process is very important. Reasonable process arrangement can accelerate production cycle, shorten processing time and save cost effectively.And more importantly accurate and reasonable processing can guarantee the die in the production process stability and prolong the life.Some machining errors will lead to die welding, no matter how good the welding, the die is a loss;In addition, poor processing may also affect the mold action, reduce the mold life, resulting in the mold in the production process of cracking or even break.
4. Standard parts
What determines the capacity of the bucket is the lowest bar.We all understand this, but we often don't notice it when we do it.Mold is the same, although standard parts do not directly participate in molding, but control the entire mold operation.Good standard parts should be able to wear, hard enough, high precision, not deformation.The price difference of standard parts of different brands is very big, so do not kill the mold blindly, kill to kill to kill, your mold straight from Mercedes down to the public.
5. Collision (flying mould)
To touch is the mold locksmith's experience, the seemingly simple work is the most technical it is a comprehensive work.
6. Polishing/leather striations
Mold polishing is the last step of mold manufacturing.Polishing is directly reflected in the plastic parts, so this is the most face-saving work.Polishing can also help and complement the action of the mold, especially for stripping very meaningful.Often some die production is not smooth because of the lighting is not in place, resistance is too large, stripper difficult, even white, crack, and so on.
7. Mold assembly
Mold assembly is just like the assembly machine, every part, every screw can not be wrong, otherwise the consequences will be quite serious, light lead to product defects, affect production, heavy thoroughly damage the mold, resulting in scrap.So the assembly work must be very meticulous.In the process of assembly, pay attention to mold cleaning, especially the waterways, screw holes, and be sure to clean the iron inside.
Hot or cold
This actually has the least impact on the quality of the molds, as the hot runner is usually designated by the customer, especially for some big customers.Foreign well-known brands are very good in both quality and after-sales service, so there are generally no problems in quality.It's just that some of the heat channels in the country vary greatly in quality.Individual small businesses compete for price advantage in order to save costs, and they can easily go wrong with unreliable heating and transmission parts.The main problems of the cold runner are how to ensure the balance of injection molding, gate size, injection molding pressure and so on.
9. Cooling water channel
Anyone who has experience with molds knows how important cooling is to a mold.As prices and wages rise, it is impossible to imagine a profit without reducing the one-second injection cycle in mass production.However, as the production cycle is accelerated, the mold temperature will rise. If the mold is not effectively controlled, it will be too hot to form, and even result in the mold deformation failure and scrapping.Therefore, good waterway design is particularly important, including waterway arrangement density, diameter, mutual link and so on.
10. Mold maintenance
Mold maintenance is mainly in the production process of maintenance and maintenance.Molds, like cars, can be scrapped if they are not used for a long time without maintenance.Therefore, the mold should be fully maintained after each use, especially the rust prevention of the molding part and the rust prevention of the main moving parts.As the mold is to receive water during production, it may sleep on the mold during installation or disassembly, so make sure that the mold is dry, and then apply a layer of oil to protect it