Mold manufacturing process is a complex process, from design, processing, assembling and debugging steps, finally can really be put into use, in the entire life cycle, the influencing factors on the quality of the mold has the following 10 aspects:
Steel is the decisive factor of mold quality, choosing reasonable steel is the top priority.
The standard for selecting steel is:
① Requirements for injection molding materials
Different types of plastic should use different types of steel, such as high polishing requirements, corrosion resistance and so on.
② The price
It can be ok if the steel performance can meet the requirements, not the more expensive the better;
Considering the cost factor of the mold, the mold steel should be selected corresponding to the die life to avoid unnecessary waste.
③ Heat treatment.
The surface treatment of the mold is also very important.
Nitrification – can enhance the surface hardness of steel and prolong die life.
Electroplating – can be effectively modified for mold steel, and some plastic materials which requiring high brightness and corrosion resistance can strengthen and improve the performance of steel by electroplating.
The mature mold structure not only takes into account the material properties of the product — shrinkage, forming temperature, elastic tensile deformation coefficient, etc., but also takes into account the speed of cooling water, opening and closing modes speed.
Reasonable mold structure can effectively prolong die life and ensure smooth production of mold. Improve efficiency and reduce costs.
A handy tool makes a handy man.
It is particularly important to arrange the mold process. Reasonable process arrangement can speed up production cycle, shorten processing time and save cost effectively.
Moreover, it is more important that precise and reasonable processing can ensure the stability and prolong life of the mold in the production process.
The processing error can cause the mold to burn welding, no matter how good is the welding, it is a kind of loss to the mold;
Besides, it can also affect the mold movement, reduce die life, and cause the mold to break even in the production process.
The one that determines the capacity of a bucket is the lowest.
This is understandable, but it is often overlooked when you do it.
The mold is the same, the standard parts are not directly involved in shaping, but control the whole mold operation.
Good standard parts should be able to wear resistant, hard enough, high precision, not easy deformation.
Different brands have a wide spread of standard parts, so do not just kill the price, otherwise your mold quality will be serious affected.
Dies arrange is against the experience of the tool fitter, the seemingly simple work is the most technical work.
The complex mold is mainly count on this skills.
The flat die is the simplest, as long as there is no flying edge on the fractal surface will be ok.
Like auto parts die is very troublesome, not only the fractal plane is more irregular, and often include multiple sliders, top block.
Meanwhile, it can improve the other problems by mold arrangement.
So it’s a comprehensive work.
The polishing of the mold is the last part of the mold making.
The polishing is directly reflected on the plastic parts, so it is the most “outlook” work.
Polishing can also help the mold action, especially for the demold.
Often some die production is not smooth because of the polish is not in place, the resistance is too big, which cause demold hard, even stress mark and top end crack, etc.
Die assembly like to assemble the machine and every parts, each screw can’t go wrong, otherwise the consequences will be severe, at best it will led to the product defects, affect production, or damage the mold completely, and causing scrap.
So the assembly must be very meticulous.
Special attention should be paid to the cleaning of the mold in the process of assembly, especially the water path, screw holes, must be blown clean of iron, otherwise the customer will be very angry.
Hot Runner or Cold Runner
This actually has the least impact on mold quality, because the hot runner is generally designated by customers, especially for big customers.
Whether in quality or after-sales service of foreign famous brand, they all did very well, so quality is generally not a problem.
It’s just that some of the heat runners in China are of very different quality.
In order to fight for the advantage of the price, individual small businesses always save the cost, and use some unreliable heating and transmission accessories, which are easy to cause problems.
The main problem of cold runner is how to ensure the balance of injection molding, the size of injection mouth, the injection pressure and so on.
Anyone with experience in the mold knows how important cooling is to a mold.
Because of the increase in prices and human wages, the producers will get a huge amount of profit by reducing the injection cycle for mass production.
But at the same time will causes the mold temperature to rise, if not effectively control will make the mold not be formed, or even lead to mold deformation and be scrapped.
Therefore, excellent waterway design is particularly important, including the distribution density, diameter, and links among the waterways.
Mold maintenance is mainly refer to the maintenance in the production process.
It is like a car, if you don’t use it for a long time and don’t carry out maintenance, it will be scraped.
Therefore, every time the mold is used, it should be fully maintained, especially the rust of the forming part and the anti-rust of the main moving parts.
Because the mold is connected to the water during the production process, the water may be dropped on the mold during installation or disassembly, so make sure the mold is dry, and then brush a layer of oil to protect it.