What are the parts of an injection mold?

The mould consists of two primary components, the injection mould (A plate) and the ejector mould (B plate). These components are also referred to as moulder and mouldmaker.

What is the core side of a mold?

Sometimes called the “core,” it is the half of the mold where ejectors, side-action cams and other complex components are located. On a cosmetic part, the B-side usually creates the inside of the part.

What is cavity in plastic mold?

The mold may feature either one cavity or multiple cavities, each of which can be used to create a single part. As such, a single-cavity mold produces one product per cycle, while a multi-cavity mold produces more than one. Next is injection, in which plastic is melted down and inserted into the mold.

How long do injection molds last?

So in essence, a production cycle directly correlates to the number of parts an injection mold will be able to produce in its lifetime. The SPI (Society of the Plastics Industry) classifies injection molds based on their life expectancy: Class 101 – Life expectancy of +1,000,000 cycles.

What is clamping force in injection molding?

Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold.

What is bolster in mould?

So what is a Bolster? The bolster plates are a means to enable Tool to be fitted to the injection moulding machine. Below is a diagram of how a injection mould tool is laid out.

What is the function of gates in injection molds?

The “gate” is the opening in a mold through which the molten plastic is injected into the final part. It is the boundary between part and scrap. The location, size, and shape of the gate can have a significant effect on everything from the structural integrity to the visual appearance of a finished piece.

Which side should plastic injection from core or cavity?

Tooling design. Since it can be very difficult to take out the product from the Cavity side because of no ejecting mechanism, a tooling needs to be designed in a way that the product is always being hold at the Core side after open. To do so, the Cavity side is generally smooth whereas the Core side is relatively rough …

What is sleeve ejection?

The function of an ejector sleeve in a mold is to eject either an entire finish molded piece part or apply ejection force to some portion of the molded piece part to assist with part ejection, in combination with other ejection features designed into the mold.

What is a lifter in injection mold?

The lifter is mainly used to form the internal undercuts of a molded plastic part, and at the same time it also offers ejection function. The mechanism features a simple structure but poor rigidity and a short travel distance. The typical structure is shown as below: Most injection mold company usually apply the lifter structure as shown.

What is the purpose of a slider and lifter in moldmaking?

Answer Wiki. Sliders and lifters are an essential part of the mold assembly as they allow to form the undercuts in the product. The topics covered are as follows. Creating a Slider for the openings in the side wall of the reference part. Creating a Lifter for the openings in the side wall of the reference part. How to reference pattern a volume.

How much can lifter rod be shortened during mold close?

In most cases, the lifter rod or shank will be shortened by 0.002-0.003 in. to accommodate these clearances and make sure the lifter is down tight during mold close. In one case where I refurbished a mold with new lifters, the parts produced had a clip detail that was out of spec by 0.007 in.

What is an internal core lifter used for?

An additional mold piece that is used to form an internal undercut that cannot be accessed from the side of the part. Unlike a side-core, an internal core lifter enters the mold along the parting direction, not through the side, and is actuated by the ejection system.