“How can we mold more parts on the same equipment in less time and lower our costs?” is a standard question whose common answers include reduce cycle time and/or improve mold yield efficiency. Surface treatments have been part of this solution and in the last 10 years a new family of coatings—DLC (diamond like carbon)—has [...]
a most-commonly-used ejector unit only play the role as ejecting tools. Sometimes, mandrils can also partake in the molding of plastic parts according to the needs thereof. Such mandrils can then be made into the same shape as certain part of the plastic parts or just as core. […]
the first principle of designing ejector unit is the action point of the ejection force shall be near the core as much as possible since the plastic parts would enclasp the core when contracting.
the second principle of designing ejector unit is the ejection force shall be imposed upon the section of the plastic parts with the largest rigidity and intensity. […]
the third principle of designing ejector unit is the ejection position shall be set in the plastic parts or at the position with the least influence over the appearance of the plastic parts, thus ensuring the sound appearance of the parts.
the fourth principle of designing ejector unit is in case the ejection position shall be on the base level of the plastic parts for use or assembly, […]
shallow side concave of plastic parts requires small core-pulling distance, yet when the molding area of side concave is large, a large core-pulling force is thereby needed, therefore, tilted lifter mechanism can be adopted for side parting and core-pulling. […]
When the slide is set on the fixed mold, […]
Pull the active core out from the molding position to a place not interfering ejection of the plastic parts, and the distance moved by the active core or slide is called core-pulling distance. Generally, core-pulling distance equals to the depth of side hole plus a safety distance of 2—3mm. A core-pulling mechanism for pulling a slide [...]
the flanks of plastic parts are usually provided with holes or flutes, under such cases, side-direction forming cores must be employed to form plastic parts. […]