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The mould designer is frequently confronted with a confronted design that incorporates a recess or projection which prevents the simple removal of the moulding from the mould.The component designer,while endeavouring to produce in line of draw component designs,has often to include a recess or a projection to perform a particular function or to satisfy an artisitic requirement.A moulding which has a recess or projection is termed an undercut moulding.The mould design for this type of component is inevitably more complex than for the in line of draw component,as it necessitates the removal of that part of the impression which forms the undercut prior to ejection.
The final stage which must be undertaken when designing an injection mould is that of checking the completer drawing. During this most important stage the design is scrutinized in a critical manner with the objects of discovering and correcting errors which may have occurred. The errors may be in design, or in drawing or in dimensioning.
When the drawing is complete, the draughtsman has the unique opportunity of being able to re-examine the overall design to ensure that the inpidual features combine to form a workable and efficient mould unit.
For the mould draughtsman, the process of checking is essential to ensure that errors incorporated in the drawing are not produced in the manufactured mould. Naturally if an error remains undetected, and if the mould is manufactured to specification, considerable expense and delay will be incurred in making the necessary corrections. It is sound practice to have the mould drawing checked by an independent design(a checker) who, not having been connected with the design previously, will be able to check the drawing quite impartially. However, the fact that a drawing is subsequently scrutinized by a checker must not prevent the draughtsman from checking the design thoroughly himself.
当设计塑料模具时，通常初学者经历的主要是应该从哪里下手以及应该采取的一般步骤是什么。本课内容包括介绍性的指导，使读者能够遵循确定的步骤来上掌握设计模具的方法。
实际上，模具制图通常包括三个视图，即：动模的俯视图、定模的俯视图及动定模的俯视图。这个总装配图应该包含足够的信息，以使绘图员可以画出每一个模具零件的详细图纸。然而，对于初学者，只画两个视图就够了，通常选择的这两个视图时动模部分的俯视图和整个模具的俯视图。