Month: October 2016

How to Do China Aluminium Die Casting Moldmaking

diecasting

Die casting and the use of an aluminium mold for plastic injection contributes majority to the production of a large number of metal parts and components. Moldmaking or the incorporation of an aluminium mold plays a major part in giving shape and structure of the final product. The die casting process forces the molten metal into molds and hence requires a mold with an exact specification in order to achieve the desired product in accurate size. The use of an Aluminium mold for plastic injection process has already made a huge success in achieving the target of manufacturing the plastic parts and components according to the client’s requirement with accuracy. So, in this blog let’s just discuss what are those factors which can affect China Aluminium Die Casting Moldmaking.

Draft

Draft is the degree to which the mold can be tapered. For ejecting the casting from the die, a precise and accurate draft is needed for smoothing the process, but this doesn’t hold true always as draft is not constant and varies according to the angle of the wall that can play a major role in China aluminum die casting moldmaking. Mold geometry can be less influential on draft. Similarly inner walls can also shrink and require more drafting than outer walls.

Fillets

During moldmaking there occurs angled and sharp surfaces which can be smoothened by fillets that have a concave junction which can support these angled surfaces. If there are many sharp corners arises during casting then they can be a hindrance for the molds and can increase the risk of production errors, that’s why many molds use fillets to have rounded edges.

Parting Line

To connect different sections of mold, parting line is used. If the parting line becomes dispositions or attains deformity because of a lot of strain then the material can come out through the gap between the mold pieces and can lead to bad moldmaking and wastage of material.

These are some of the most important factors while doing moldmaking but there are some other similar factors which should also be taken good care of while moldmaking process.

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How to Choose Low Pressure Molding Machine

How to Choose Low Pressure Molding Machine

Low pressure structural foam injection molding is a gentle injection molding process which makes use of polyamide or polyolefin hot melt adhesives that is designed as a feasible solution for sealing printed circuit boards, batteries and connectors and provides relief for cables. Now the key to the process is the consideration of raw materials and the specialized molding equipment used. It is always wise to talk to the supplier before doing the low pressure molding process regarding in-depth specifications for the machine. Well! There are some other factors which are necessary for deciding for machines and are discussed in brief below.

Mold

The mold should be fitted in the clamping area and this is determined by the spacing on the machine restricting mold fitting and removal. The height and depth of the mold should be accommodated well in the stroke of the clamp and there should be a sufficient opening in the stroke for ejecting the plastic component. For free fall ejection, daylight between platens must be greater than mold height and twice the depth of the component to be ejected.

Clamping Unit

The clamping unit should supply locking force so that mold stays tight during low pressure structural foam injection molding process, otherwise, the mold will be broken into parts and the molten material will splash out along the mold split line. Most of the times thin wall sections and deep draw depths require 3-4 tons per square inch, whereas thick wall sections and shallow draw depths require 2 tons per square inch. For calculating the locking force during low pressure molding these values can be multiplied by the projected area of the component.

Injection Unit

The injection unit is important in low pressure structural foam injection molding and must be capable of supplying component shot weight. The total shot weight should not go beyond the 90% of the injection capacity of the machine otherwise, there will be damage. Usually, the injection capacities are written in grams and whenever any other material needs to be processed, then that component shot weight should be recalculated using that material’s specific gravity.

To get more information kindly go through our web – http://www.china-casting.biz/structural-foam-injection-molding.html