With the continuous improvement of the level of mold manufacturing and mold workers’ skill in China, more and more European and American companies have dropped their purchase orders to Chinese plastic mold factories. The continuous deepening of information exchanges between the two sides has greatly promoted the development of China’s mold industry.
For those buyers who often purchase in China, it is simple to deal with China’s mold and injection molding suppliers. But for those who first came into contact with this mold industry, it was a very troublesome thing, especially in dealing with China’s mold factories outside of thousands of miles.
Language and technical communication constitute two significant obstacles.
For many people who bought customized plastic parts in China for the first time, they were completely unfamiliar with this industry.
Also, this industry is technology-intensive, the quotation requires suppliers and buyers to have a good interaction.
The most important is how the buyers express their ideas to the suppliers.
It is precisely at this point that many buyers do not know how to handle it. They often ask the supplier for a price from the very beginning. In fact, the price given by the supplier at this stage is very inaccurate. I will introduce the preparation process before the quotation of molds and molded parts so that buyers can have a clear understanding.
The manufacture of injection-molded parts is a very complicated process. The first is the manufacture of molds, followed by the injection molding and second operation of injection-molded parts, which involves the transfer of a lot of information.
The top priority is how the buyer expresses his product requirements clearly to the supplier.
In many cases, suppliers are required to quote only in the case of a hand-drawn drawing. Sometimes there is no requirement for plastic materials.
Buyers just mentioned adjectives like “soft “and “hard” to describe the stuff he wants.
In fact, this is incorrect.
4 Steps for plastic mold quotation:
#Consult with experts
The correct way is to find an injection molding engineer or mold engineer around you to consult with them. This early investment is necessary, and this investment will be paid-off in the future.
Of course, I would be happy to provide you with this service, but at this time, it is challenging for me to quote you also.
You should find a very experienced engineer and tell him, face to face, what you think, the requirements for the product, the quantity requirements, the assembly requirements, and so on.
He will give you good advice based on your actual situation. During this period, he will tell you which plastic material to choose, how to design the product, how to assemble, and how to arrange the reasonable quantity.
After the above is completed, the 3D drawing design of the product can be performed. You can tell the design engineer your requirements in great detail. They will make the appropriate design according to your needs.
After the preliminary design is completed, you should do rapid prototyping at this stage to check whether your design intent has been achieved for new developments or changes to the old product.
Rapid prototyping allows inspection of the appearance, assembly, and strength of a designed product. Modify the problematic design and make a new 3D printing. Repeat this process until the final 3d printing meets the requirements.
This cost is relatively small, with short time, and it can avoid costly and time-consuming mold changes later. In China, generally speaking, the cost of a small 3D printing is about 50 to 60 US dollars. This step may save you thousands of dollars later.
After this stage, you can give your potential suppliers a chance to quote the changed design. My article on this topic is very detailed about how to deal with Chinese suppliers.Get A Quotation
How to copy existing products
Of course, if you just want to copy existing products at this stage, you can send the product directly to the supplier and tell them your specific requirements. Fees can be deducted after the transaction.
If you have only one sample and inconvenient to send it, you can take a picture of the sample. According to the three-view standard, you show suppliers a sample photo. Mark the position and size of the undercut, dents, and holes in each direction on the picture.
In the photo, the size of the product is identified in detail, i.e. the length, width, and height. In theory, the six sides of the product must be photographed. The more detailed photograph is, the better it is.
These plastic materials usually appear in the form of a triangle.
In the end, you still have to send this sample to your final supplier to facilitate their design.
4 main points related to plastic mold and injection part price
The number of purchases dramatically determines the price of the product and the plastic mold. As long as the product is only 10,000, do not put forward a requirement of 500,000, because 10,000 shoots required mold steel, mold design, and processing methods are entirely different from the 500,000 requirements.
If the number of products is 10,000, the four-cavity mold can meet the requirements. If it is 500,000, the mold will require 10, 12 cavities or higher. the more the number of cavities is, the higher standards of the steel material and processing requirements will be, this will lead to a significant increase in the material cost and processing cost of the mold. The considerable quantity shares these costs. If the quantity is small, then the cost sharing of each product will be high.
I have encountered a case where there is an ABS molded product. The annual demand is 1500 sets. It is internally threaded and needs to be unscrewing. If you need a full-automatic unscrewing mold, the cost will be high, and if the thread is made into an insert, The cost of the mold is only about 2/3 of the fully automatic mold cost, and the increase in injection molding cost is only small.
In general, dark-colored products need lower prices than light-colored products. Because in some cases, the regrind material can be used, if it is a white or transparent product, the regrind material is difficult to use, which will increase the supplier’s raw material costs.
Frequently, the runner material and the new material have the same effects.
The barrel of the injection molding machine is sometimes not so clean, so sometimes other colors will mix in. If the product requires transparency or white, this product is defective. If it is a dark color or even black, it cannot be seen. This product is a good product.
As we all know, the processing cost of a loose tolerance plastic part is much lower than that of the tight one. Molds with tight tolerances have very stringent requirements for processing and mold steel and even require unique injection molding process.
In general terms, the plastic we choose should be conventional plastics, not engineering plastics. Nylon66 flare-retardent grade “v0” price is more than four times the conventional PP plastic. The cost of the ordinary ABS is 1.5 times the price of PP.
If it is mass production, the cost difference is great.
Some plastics are corrosive, so there is a higher demand for the steel of the mold. This will also increase the manufacturing cost of the mold. There are also higher requirements for mold maintenance. The price of the steel s136 level is more than five times that of the steel p20 price.
Among the three methods mentioned above（autocad files, samples photograph and samples）, sending supplier samples directly is the best method. By this way, the molder can clearly know the structure of the product and can also find out the structure of the previous mold. Research on off-the-shelf samples can avoid many detours in molds building and injection molding products.
In short, before the quotation, the more the supplier knows your requirements and the specific structure of the product, the better it is.so that the accuracy of the quotation can be guaranteed to the greatest degree. At the same time, it ensures the smooth progress of the project.