First of all, a basic question, what is the cost of the mold, a friend can answer me without thinking: the mold cost is the mold material fee + processing fee + tax. Of course, there is also a labor fee. We can think that the labor fee is included in the processing fee, and of course the design fee.
Rational design of products
I believe that many people will not agree with me. Whether the design of the product is reasonable or not, how could it be the biggest factor affecting the cost of the mold. Let's take a look. The first foot, I kicked the ball to our OEM. But everyone thinks about it. If the product design is unreasonable, it is a disaster for the mold company. It is a disaster.
Therefore, a product designer should know as much as possible about the knowledge of the mold, so that the designed product is as suitable as possible for the mold engineering, and do not increase the difficulty and cost of the mold. Under the premise of meeting the assembly of the vehicle, maintaining good communication with the mold department is the most effective and direct measure to reduce the cost of the mold. There is also a philosophical question of productivity and production relations. Some product engineers believe that the cost of mold is a matter for your mold company and has nothing to do with me. However, if the production relationship is recombined, the injection molding company and the mold company are one, what will happen? In fact, this is a social trend. The companies that are operating better now are the combination of injection molding companies and mold companies. Almost all companies that exist by making molds can hardly survive. Therefore, if the product design is unreasonable, it will directly increase the cost of the mold.
Product design change
Mold companies often encounter such a situation. In a certain project, the mold has just been designed, the mold frame has just been ordered back, and the customer's change notice will come. If it is a small change, it will not affect the overall structure of the mold. It doesn't matter, sometimes it's more serious, because the shape of the product changes, the mechanism needs to be added to the mold, and even the mold base must be reordered. This cost has increased. So try to minimize design changes. Now there are a lot of rapid prototyping methods. Before the mold is made, the 3D will be used to make the whole vehicle assembly, and the 3D of the product can be corrected in time to minimize the cost increase caused by the product design change.
Is the mold design perfect?
1. Rationality and processability of mold design
In general mold companies, there must be old and experienced designers in the design team, as well as young engineers who have just come out of school. We can't ask young engineers to design high-level molds independently when they first come to the company. Experienced mold engineers, if the mold structure produced by closed doors, can not be perfect, there will definitely be some unconsidered details. One of the most important and effective methods is the collective review. There are now many simulation methods, such as mold flow analysis, mold structure dynamic analysis, trial products and design 3D comparison analysis, which can minimize the cost increase caused by the irrational mold design.
2, design waste
If the mold user knows that as long as the mold produces 500 samples, it is used to develop the market, but if we design according to the mold with a life of 300,000 molds, this cost will be large, which is a waste of design.
Minimize the number of molds in the mold
Many mold companies calculate the processing cost of the mold, and calculate the processing fee based on the number of days after the mold receives the order and the product is qualified. If the mold has been tested several times, it cannot be delivered, except for the penalty according to the contract. The more days the mold is in the factory, the more processing costs. Of course, the cost of the test mode is also very considerable. Therefore, multiple or uncontrollable test mode times is a large blind spot for mold cost control.
Let's analyze the reasons for the many times the mold is tested:
1. The mold design has not undergone sufficient collective review, and the mold structure is unreasonable, so that the mold has to undergo many improvements after the test, so that the mold cost exceeds the budget.
If you have made several improvements, you can get it. It is fortunate. There are many cases that are unsatisfactory. Even if the mold is to be scrapped and reworked, the cost cannot be controlled. There are also some cases where the mold design is very good, but the processing of the mold is not in place, which makes the number of trials increase without any reason, directly increasing the cost of the mold. There is no objection to this problem, so many mold companies have increased their investment in measuring equipment.
If you have made several improvements, you can do it. That is fortunate, there are many cases that are unsatisfactory, and even the mold has to be scrapped.
2. The model is not selected for the best molding process and the model of the injection molding machine. The mold is well done, but the injection molded product is not ideal. The number of trials is increased without any reason, which directly increases the cost of the mold. This is a common problem in some small mold factories.
3, the physical properties of plastics are not fully understood, and even the shrinkage rate is not accurate, such a situation has occurred from time to time. Therefore, before designing the mold, it is necessary to understand the physical properties of the plastic, in order to effectively reduce the number of trials.
Mold materials and standard parts procurement
Choose a stable, reputable supplier. It is a pity that if the mold is out of order due to cheapness and sloppy purchases. This situation is actually a lot. Although it is possible to hold the supplier accountable, the biggest loss is the mold company and the mold user.
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