Mould base for plastic injection moulding.
It is the production tooling that holds the moulds used to produce plastic parts in injection moulding. In its simplest configuration it consists of:
- a stationary plate to which the front half of the mould is attached (typically the cavity)
- a moveable plate which carry the other half of the mould (core)
- a support and guidance system for the moveable plate (typically 4 cylindrical pins)
More complex parts are formed using more complex moulds, which may have movable sections called slides.
Ejector plates, attached to an hydraulic piston, operates the ejection pins that separates the moulded part after cooling.
For mould bases with solid shapes or when good mechanical qualities are required, 1.2311 steel can be used. 1.2311 is characterized by high hardness (30-32 HRC), excellent hardening penetration, good workability and optimum suitability to etching.
From series 446 upwards, starting from thickness 76, steel 1.2738 is also available. 1.2738 keeps the mechanical core characteristics unaltered and is therefore suitable for large thicknesses.
When requirements are less demanding, as with interchangeable dies, 1.1730 steel can be utilized.
For cavity plates, a stress relieving heat treatment is performed to raw steel bars after they are cut to size.
Every operation of shaping, drilling, boring, machining and grinding is carried out exclusively with CNC machines.
- grind finish surfaces
- squareness 0,01 mm over 100 mm length
- planarity 0,005mm over 100 mm length
- pins interax 0,005mm
tight tolerances allow perfect interchangeability of the plates.
Plates sides (typically grinded), can be upon request left machined and prepared with a 25 mm height reference groove all along the perimeter to be used for alignment (feature available from series 396 up).