Common features Snap joints are a very simple, economical and rapid way of join-ing two different com-ponents. These angled mold ejection components move laterally to form undercuts. Cam-pin-driven slides retract as the mold opens. Disadvantage of the undercuts.

In milling, it refers to a feature which is not visible when the part is viewed from the spindle. An extreme case of an undercut part is illustrated here, with the cross-section of a part in a mold. Some of the more common ways to use undercuts: Create interlocking or snap and latch features. Home / Design Tips / Undercut. An undercut is any indentation or protrusion that prohibits part ejection from a mold.
Larger angles will induce stresses into the part on stripping even if the part is deformable enough to allow stripping at all. An undercut in injection molding is any part feature that prohibits an ejection of a part from the mold. What is an undercut in injection molding? Some features of a molded part will require an ‘undercut’ This is an area on a feature that would prevent the tool opening properly due to overhanging material. The undercut portion of the part is molded by the action, which moves away from the part as the mold opens. As the undercut becomes deeper, it results in a part that is difficult, or perhaps impossible, to remove from the mold. 6 Ways to Achieve Undercut Success in Molded Parts If your part design requires undercuts, consider side-action cams, bumpoffs, inserts, and other complex injection molding techniques. LEARN MORE .

In manufacturing, an undercut is a special type of recessed surface that is inaccessible using a straight tool. In printed circuit board construction, it refers to the portion of the copper that is etched away under the photoresist. Lower viscosity means easier flowing, and high viscosity materials are more difficult to push. Undercuts are those features in an injection-molded part that prevent its ejection from the mold. Faster cycle times, less maintenance and simplified operations equal increased profits. LEARN MORE . Below are 3 typical undercuts that are frequently seen in molded parts: holes. This lengthens cycle times, adds costs, and can cause part damage. Reducing the number of undercuts will reduce the cost of tooling. Because cams were already forming the external face of the internal component, the plastic engineer opted to utilize cam functionality to add an undercut locking feature on that face. Undercut features that cannot be avoided through redesign require mechanisms in the mold to facilitate ejection. All types of snap joints have in In turning, it refers to a recess in a diameter generally on the inside diameter of the part. Other mold devices can be used on parts with undercuts, such as lifters and collapsing tooling. clips. Producing plastics parts with undercuts presents distinct challenges for molders. Purpose of Undercuts In Plastic Injection Molding. An undercut is any indentation or protrusion that prohibits an ejection of a part from a one-piece mold. Some features of a molded part will require an ‘undercut’ This is an area on a feature that would prevent the tool opening properly due to overhanging material. Common features Snap joints are a very simple, economical and rapid way of join-ing two different com-ponents. These types of mechanisms include side-action slides, lifter rails, jiggler pins, collapsible cores and unscrewing mechanisms. Providing thread and undercut release solutions for the Plastics Industry since 1965. A good example is the classic snap clip. Sliders use cam pins or hydraulic cylinders to … Watch the video demonstration for more information. For the external component, options for forming the mating undercut included lifters. Undercuts are protrusions or recessions in a part that prevent the mold, after the part is formed, from sliding away along the parting direction. In molding, it refers to a feature that cannot be molded using only a single pull mold. Sometimes, holes or vents are required to equalize the pressure on the part’s inner and outer walls during the heating and cooling of the mold. Plastics Materials Guide; Blog; Contact; Search for: Undercut.

These types of mechanisms include side-action slides, lifter rails, jiggler pins, collapsible cores and unscrewing mechanisms. Undercut A protrusion or indentation that impedes the withdrawal of a molded part from a two-piece, rigid mold. Typical undercuts. By contrast, rotational molding lets the molded plastic shrink away from mold walls. Lifters are frequently used when a segmented plastic undercut is necessary.
Plastics Materials Guide; Blog; Contact; Search for: Undercut.

Adding cost to tooling and molding, as they make the molds and production complicated.