Meusburger now offers the E 3270 inclined ejection unit for easy demoulding, which the company says is a cost-effective and ready-for-use alternative to currently available ejectors for inclined ejection units.
For easier demoulding of internal undercuts in plastic parts, ejectors for inclined ejection units may be used instead of slide units. The new E 3270 inclined ejection unit from high-precision standard parts manufacturer, Meusburger, offers a cost-effective and ready-for-use alternative to the existing ejectors for inclined ejection units on the market. Its part geometry is created with an eroding block, which allows for maximum design flexibility, the company notes. Furthermore, the DLC coating of the ejector rod ensures minimal wear, good sliding properties and a long service life.
The unit essentially consists of three parts with a simple functional principle — a rectangular block for eroding that comes in various sizes, which is machined by wire EDM as per the undercut. The block is mounted into a groove using an ejector rod fastened in the ejector set. The ejector rod slides along the ejector rod guiding unit, which is screwed and flushed to the back of the intermediate or cavity plate. Thanks to the rectangular design, the guiding unit has an optimal contact surface. Simultaneously, static indeterminacy and self-stress of the lateral guiding unit is thereby prevented. If the ejector set is moved forward, the machined block for eroding slides along the groove and releases the undercut in the plastic part. The inclined ejection unit is available in eight different sizes and strokes, ranging from 4-8 mm with a maximum angle of 10°.
The DLC coating of the ejector rod has a material grade 1.2767 to ensure optimal sliding friction between the ejector rod and eroding block as well as between the ejector rod and the matching guiding unit made of tin bronze. The eroding block is supplied in material grade 1.2343 ESR with a hardness of 54-2 HRC. Thanks to the hot-work steel in ESR grade, polishing is also possible.
According to Meusburger, four ejectors can be produced from one E 3272 block for eroding of the inclined ejection unit. The block is offered in four sizes. The contour of the guiding unit and possible batch processing during wire EDM ensure short machining times. The angle of the ejector that is optimal to the application can be selected, meaning that the stroke can be adapted exactly to the design. This is particularly advantageous if the space for the ejector is limited or when a difficult geometry on the plastic part exists. The thickness of the block for eroding is already ground and ready-for-use but it can be re-grounded to any thickness from 7-20 mm.
The CAD data for the E 3270 Inclined ejection unit is also available for download. Furthermore, installation spaces can be generated immediately, which saves time during the design process. The inclined ejection unit as well as the block for eroding are available from stock.