Injection Mold Qualification Protocol and Tooling Steel Selection Criteria
Tool steel selection and scientific qualification protocols dictate mold life, cycle efficiency, and dimensional capability under continuous production.
Rockwell Hardness
Meaning
Resistance of a material to permanent indentation is measured by applying a specific load through a diamond cone or a steel ball indenter. This measurement, known as rockwell hardness, provides a quick and non-destructive method to assess the strength and heat treatment of a metal alloy. Operators use different scales depending on the material thickness and composition.
Measurement Scale
Standard scales are defined by combinations of loads and indenters used in laboratories. The HRC scale uses a diamond cone for hardened steels, whereas softer metals are measured with a steel ball.
Indentation Procedure
Application of a minor load starts the test sequence to establish a baseline depth. The major load is then applied and held for a specified dwell time before being released. Measuring the difference in indentation depth allows the instrument to calculate the final hardness value.
Material Performance
Consistently high hardness values indicate that the component has undergone successful thermal processing. Low hardness suggests that the material was not heated to the proper temperature or was cooled too slowly. This measurement establishes a critical quality check before components are released to the production line, preventing premature failures in service and ensuring that each batch meets structural specifications.