Tool Steel Selection Guidelines for High Volume Injection Moulding Tooling Baseline Fabrication
High-volume injection moulding baseline tooling demands martensitic stainless or pre-hardened steels matched to polymer abrasiveness and cycle volume.
ISO 4957
Meaning
Global requirements for tool steels define the delivery conditions and technical properties for alloyed steels used in machining and moulding. Standard iso 4957 specifies the chemical ranges and hardness levels for cold-work and hot-work steels. These provide the primary reference for toolmakers when ordering material for injection mould bases and cavities.
Steel Specification
Classification of steels by their alloy content allows designers to select the most appropriate grade for a specific resin or production volume. The standard iso 4957 includes grades such as 1.2311 and 1.2344 which are common in the plastics industry.
Thermal Treatment
Heat treatment protocols found in the annexes of the document provide guidance on achieving the desired Rockwell hardness for a tool. Correct hardening ensures the mould can withstand the compressive forces of the clamp without deformation. A moulder relying on these specifications expects a predictable response from the steel when subjected to vacuum hardening or tempering cycles.
Grade Classification
Distinction between various steel groups helps in managing the trade-off between wear resistance and toughness. Cold-work steels provide high surface hardness for long-life tools, while hot-work steels offer better resistance to thermal shock. Selecting the wrong grade from the list can lead to premature tool failure or increased maintenance costs during the life of the project.