As to the cost breakdown, in fact ,if all the material and standard are the same, Chinese offer will lower for sure ,because we have about 200 workers in a factory,while in Americam most of the company just about 20 workers , our labour cost is of course lower .As to the shipping cost and custom cost ,in fact , we always note this ,so we have our own Hongkong forward to save the cost,however,good communication is very important in this procedure.
Производитель пресс-форм для литья под давлением является лидером среди производителей пресс-форм. Наша основная цель – создание продукции высочайшего качества. Injection Mold Manufacturer — американская компания по производству пресс-форм для литья под давлением, расположенная в Лос-Анджелесе. Наша компания занимается проектированием и изготовлением пресс-форм. Основными видами продукции являются литье пластмасс под давлением, литьевые детали и литьевые формы на заказ.
Our company quoted building a tool 2 weeks ago and our price was $32,000 when the China price came in they were only $4,000 less (this was specifying that they use the same quality components as us). By the time you add on shipping you jump another $2,000-$3,000. In addition to the shipping you have time delays in communication, proper communication, hoping they do everything correct, shipping time, etc, etc… The inherent costs are ridiculous. Companies do not consider this, they simply look at mold cost to mold cost. It doesn’t make sense and I am glad that some are finally figuring that out.
I’ve been in the custom plastic parts business for 39 years, consequently have worked with and/or around all the popular brands of IMM’s. Your specific criteria is: “the best general purpose machine for the buck” and “tonnage range is 100 to 1000 tons”. This was the exact criteria I had when I decided to start my own molding business 15 years ago. We chose Nissei and have never regretted it. We have 1 all electric and 10 Hydraulics. One note the Hydraulics are much cleaner because they do not have the toggle clamp movement, which need constant lubrication. Also the Hydraulics are very precise and extremely robust. The next press we will purchase will be the Nissei Hybrid….An incredible machine!
Run progressive short-shots, using same injection speed/profile as if you were filling the cavities, that way, shear heating effects will be comparable. Note differences in fill patterns. Another suggestion is to hire a thermal imaging camera. That way, you can see what mould surface temperatures are just after ejection and also part surfaces on ejection. This might give other clues. A third suggestion is to do oven reversion tests. A bit tricky with the sharp melting point associated with nylons, but you should see what stress patterns and relative levels have been introduced into the part during moulding. Pity we can’t directly review images. If there’s consistently a difference, there WILL be rational explanations. With the limited information given and no knowledge of the part geometry, tool design (cooling channels), coolant temperature, melt temperature, fill pressure, holding pressure and time, etc., we must resort to conjecture.