How do you find the angle of a lifter?

One degree will travel approximately 0.017 over one inch, so with 4 inches of ejector stroke available, one degree will travel 0.068 inch (4 x . 017). Simply multiply 0.068 by any number to calculate at what angle the lifter must be. In this case, the lifter would be placed at nine degrees (9 x .

What are the plastic part design guidelines for injection molding?

Here are 8 important factors to consider to meet your plastic part design goals for a successful production process.

  • Material Considerations.
  • Radius.
  • Wall Thickness.
  • Gate Location.
  • Draft.
  • Inclusion of Ribs.
  • Mold Shrinkage.
  • Special Features.

What is mold lifter?

1. 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. Most injection mold company usually apply the lifter structure as shown . The lifter employs the 8407 steel with a hardness of up to HRC50-52.

What is side action in injection molding?

The purpose of side actions is to enable undercut geometry; in other words, to mold parts that could not otherwise be made in a straight-pull mold. In straight-pull injection molding, the A-side and B-side of the mold open and the completed part can be removed by pulling it straight out of either side.

What is an undercut in injection molding?

Undercuts are those features in an injection-molded part that prevent its ejection from the mold. With straight-pull molds such as the ones used by Protolabs, these are any protrusions, holes, cavities, or recessed areas in the part where alignment is not perpendicular to the mold’s parting line.

How do you determine the thickness of a plastic part?

The wall thickness of the plastic parts is determined by the requirements of the plastic parts, which include the strength, quality cost, electrical performance, dimensional stability and assembly requirements. The general wall thickness has its experience value.

What is the difference between elastic design and plastic design?

Plastic design is known to be a displacement-based method in which a pre-selected target drift is used along with yield mechanisms as a part of the design criteria. On the other hand, elastic designs are usually based on the conventional force based limit state method.

What is an occluded undercut?

Faces that are not visible from below the part or parting line. Occluded undercut. Faces that are not visible from above or below the part. Straddle undercut. Faces that draft in both directions.

What is lifter in tooling?

A lifter is a component that travels with the ejection stroke and moves on an angle to slide/pull cavity steel away from undercuts or details not in die draw where slides or other mechanics are not an option. There are other names for this component, as well as design variations.

Which side should plastic inject from core or cavity?

As the plastic cools, the part would shrink away from the A-side of the mold and shrink onto the core in the B-side. As the mold opens, the glass will release from the A-Side, and stay in the B-side, where it can be pushed off from the core by the ejector system.

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 grade of plastic is used in injection molding?

The rest of the mold gets made of the steel grade suited to the type of plastic getting injection molded. The lifter type mold does incur added cost to the mold. This is the cost of design complexity and the added cost of materials.

What are the requirements for the lifter?

The travel angle of the lifter should not be more than 11 degrees. Except for plane surface profiles. There needs to be a 5mm flat surface on the side of the mold where the melt flows from. The head must also be larger than 1mm. This holds the lifter in place allowing it to resist the injection pressure.

How does an injection molding machine work?

As the demand for plastic products has grown, so has the complexity of the designs. The plastic in pellet or granular forms passes through the barrel. They get mixed and melted by the screw then injected into the mold. The mold is an important feature in the injection molding machine.