Most guys will compete on an apples to apples basis, but quotes must be detailed for many to see the problems and the spreadsheets done for the purchaser to see the differentials.
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As a Chinese moldmaker,I have talked about this topic with one of my American partners, yes,he found the cost in China has raised those year, while he told me that the quality and effcient has improve as well .while, anyway, it's a problem for our cooperation, then we discuss how to low the cost ,so we discuss the molds, as Chinese standard and skillful technical to build the molds is really a big discount(eg, an USD8000 mold ,in Chinese standard would be USD4000-5000),because Chinese product is always share a good reputation ,yes,we focus on the product ,the shrinkage,the surface artistic and other factors ,then we make a nearly USD20,000 deal. Which it's helpful for Chinese and USA partners .Of course, it suits the small parts and the quantity should be make sure big enough, anyway, Chinese factory should living on the products.
If you are a seller, do you know what are the customer's mostly concern aspects on selecting an injection mold maker in China? If you are a buyer, how do you select a reliable mold maker in China? As to the Chinese partners ,yes,most of the American firms have parter firms in China, while as you said ,the partner cost will be increased much especially,because both of them are growing at the same time ,so the American firms will turn to the new parters,that's why they will get so many introduction emails every day. Hope this comments would help all to understanding Chinese factories and try your best to be patience to commuction with them ,then you will found you get exceed your expection.
Part size, and cycle time are also crucial to determining material delivery methods. I have found using different materials for tooling components will also decrease cycle times by as much as 40%. There is alot to be said with the initial mold CAD design pertaining to cost of components, the mold build and cycle time saved. Many customers wont spent the extra revenue on the proper manifold system, heat pipes, or even AmpCo inserts. To best determine what is best for the overall performance of the mold and production of parts, you should consult a full service tooling supplier.
You use a material dryer to present the material to the cylinder at the same temperature even if it does not need drying. A good unit will take into account dew point etc. You use as small a hopper as practical and regulate only a few minutes of production in to the hopper. If a medical part it will be in a clean room with atmosphere controls if not the foregoing will minimise any changes and should be good practice in any serious moulding shop. I have controlled colour discrepancies this way.
Collect the data and make sure there is correlation of the variables (i.e., change in ambient air temp and humidity) and weld line strength before mold making process or mold changes or else you may be 'chasing your tail'. There is one assumption here as well and that is an unanswered question: Did, at one point in time, the weld line strength ever meet or exceeded the requirement? If it never has, then try everything.
I have worked with flow simulations for last 20 years and I agree with John about the methodology to follow. However, the flow simulation will not give the full information and it has its own limitations. They will certainly give you the trends and sometimes exact answers. Again I am saying that the correct answer would depend on correct situation and Don should now give some more information. I personally feel that a member who starts a discussion should be actively involved and should provide inputs from time to time.
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