----------------------------------------------------------------------------------------
6 Rules in Injection Molding DesignsInjection molding is the most common process of producing plastic objects. Since plastics are known to be a very economical material due to its versatility, they are used in a wide range of applications.
The process of injection molding involves taking the plastic granules or pellets and heating these until it is melted. Once melted, the plastics are forced into a mold, where it will be cooled into the desired size and shape. The plastic part is then ejected from the mold. The process is repeated until the required quantity is been met.
In terms of injection molding designs, many experts have given their opinions as to what designs should be followed. However, the rules in designing injection moldings can be summed up in just six guidelines.
1) Make use of uniform wall thickness for the entire part – Ensuring this can minimize the sinking, residual stress and warping. It can also improve the mold fills and enhance cycle time.
2) Use the least wall thickness – In determining the wall thickness, make sure it is compliant with your materials, desired process and product design. This is important because it can ensure shorter cycle times, minimum shot weight and rapid cooling of plastics. Thus, it could save money for part costs.
3) Use ample radius for all corners – Stress usually concentrates in plastics as they cool down when the parts have sharp corners. If this happens, the plastics tend to shrink, crack or break out. To prevent this from happening, make sure you use generous radius every time corners occur.
4) Make use of gussets in improving part stiffness during bending – Ensuring this can prevent using thick sections to achieve the same part. Thus, it saves on material and cycle time costs.
5) Minimize undercuts – Be aware that undercuts for sidewalls add extra costs. The standard movement of your tools is usually in an open and close motion. With undercuts, it moves differently, thus adding complexity to your tools.
6) Drafting is important – The parts should be designed so that it can eject from your tools with a reduced cycle time and without damages to your product. Since plastic shrinks when it cools down, ejecting it without draft can make the plastic prone to stress. Drafting before production can prevent product defects and other issues before your part designs are completed. This can ultimately save your time and costs.
Remember that even professional engineers can commit errors in the part specifications and designs. By following these six guidelines, you will ensure that the result you want will be achieved and your molds can be produced without paying extra costs.
----------------------------------------------------------------------------------------
|
|
|
Username:
apollo
Profile:
Mozaics by this user:
|
|
