Injection Mould Construction

A molding according to the function of each of its parts can be divided into four sections 1. Introductory part of the plastic nozzle into the cavity cavity 2. penunjuang system (support system) 3. demolding system 4. heat transfer system

Mold Base Standard Part

In the manufacture of injection mold, mold base is an integral part, mold maker can make your own mold base or buy a standard mold base, the system of the mold base can be adjusted with the construction standards required, both for the two plate and three plate, stripper plate ejectors, hot runner and mold base for a screw, when the entire standard mold base is not there to meet the new final step is to make a special mold base.

Injection Mould Classification

classification or types of mold injection very depend on what we need to make the plastic parts, because every parts have specific and unique design. when design molds we must see what the influencing factor like geometry, number of cavities, ejection principle, plastic material and shape of part.

Injection Mold Cooling

This section is the most important part of the overall mold cylcle time, because in one cycle time, the process of heat exchange to spend about 70-80% of the total cycle time, thus setting the optimal heat transfer system will greatly affect the quality and cycle time of a product.

Undercut System : Cam, Angular, Lift Cavity, Loose core

cavity and core, and its derivatives when there are undercut on product, design and construction of a good core cavity and in accordance with the requirement could increase the life of tooling itself, reduce material consumption, reduce dependence on maintenance inserts, and can reduce the cost of making the mold so the mold cost per products also declined.

Monday, August 31, 2009

Stripper Ejector Construction (step by step mold design) part 4

on the step below we design bolts position to hold the cavity insert to top plate of mold base, i use M10, or you can use other bolts base on your strength calculation and available market, there are various bolts type available on the market, i prefer use socket head screw in mold design, see link below for reference about this type of bolts
http://www.engineersedge.com/iso_socket_head_screw.htm

Picture below shown Socket Cap Head Screw.























picture below shown cavity main insert and bolts position, i attach the bolts in 4 side symmetrically,



for easy machining process, don't forget this little tips but very important when designing mold, at corner side of pocket make sure you make Radius or half circle, so pocket can be process use in MC easily. i use half circle type in each corner.



Chamfer in Insert
to prevent accident when assembly process, safety reason and easy assembly of mold we need to make little chamfer in each edge of mold, with chamfer it also became guidance when assembly the cavity insert to mold base. see picture below for detail picture, i use C5 in symmetric chamfer and 3-10 in asymmetric chamfer.