PRODUCT DESCRIPTION:
• For moulding plastic parts requiring internal threads, undercuts, cut-outs etc.
• After cooling, the mould opens and the ejector plate assembly moves forward as far as the stop. This causes the core sleeve to move away from the centre pin and the positive collapsed sleeve to engage, which ensures that all segments have collapsed. However, the moulded part remains or hangs until the stripper plate is moved forward to eject the components.
• D-M-E's “know-how” is in the design and manufacture of these simple in operation and complex in technology mechanisms. The goals of the mechanism being easily mounted in the injection mold, with trouble-free operation and a long life have been achieved.
KEY FEATURES / ADVANTAGES:
• They allow the action of releasing an internal notch to take place simultaneously with the ejection, immediately after cooling.
• This helps to achieve a shorter injection cycle.
• Simplified mould construction. Reduced overall dimensions.
• Shortening the time for designing and making the tool.
• Custom cores with size requirements that fall outside of the standard Collapsible Core and MiniCore ranges are available. In addition, finished cores with machined, EDM’d, or ground details can be supplied.
Options and working principle:
• CC -Collapsible core Standard
The standard CC hearts consist of a central stem surrounded by a double core sleeve of sequentially collapsing segments. The forward movement of the sleeve releases the segments from the central stem support, segments 1 laterally release segments 2, and all segments retract to release the undercuts of the article.
• CCM -Collapsible core Mini
MiniCores broaden the applications of collapsible core moulds to parts as small as 10,80 mm. Due to the smaller diameters involved, these MiniCores employ three larger collapsing segments combined with three narrow, non-collapsing blades which are part of the center pin. As a result, the internal undercut geometry is not 360 degrees around but instead interrupted in three places. The 3-blade design allows for more collapse which means a deeper undercut feature can be released.
In addition to threads, other configurations such as dimples, cut-outs or protrusions beyond the capabilities of unscrewing moulds can be successfully moulded.
• Description of components:
1. Collapsible Core
Mat.: 1.2363 - Hardness: 54-57 HRC
Designed to collapse independently when the center pin is withdrawn.
The fit between segments is controlled to permit flash-free moulding.
2. Center Pin
Mat.: 1.2436 - Hardness: 60 -62 HRC
Serves to expand the segments of the Collapsible Core to their moulding position.
The pin must protrude beyond the face of the collapsing core segments, and it must have a radius around its top edge to operate properly.
3. Positive Collapse Sleeve
Mat.: 1.3505- Hardness: 54-57 HRC
Designed to function if the Collapsible Core should fail to collapse independently. In normal operation, the PC Sleeve is not functioning. It is essential to have such a unit for maximum safety and reliability in automatic and semi-automatic operation.
The Collapsible Cores now range from 18 mm to 107 mm, for the outer diameters with the corresponding inner diameter ranging from 16 mm to 85 mm. The effective collapse ranges from 1.1 mm to 4,2 mm per side at the tip of the Core, depending on the diameter of the Core.
MiniCores broaden the applications of collapsible core moulds to parts as small as 10,80 mm. Due to the smaller diameters involved, these MiniCores employ three larger collapsing segments combined with three narrow, non-collapsing blades which are part of the center pin. As a result, the internal undercut geometry is not 360 degrees around but instead interrupted in three places. The 3-blade design allows for more collapse which means a deeper undercut feature can be released.
• Оperation:
Catalog information HERE
KRASCO