Parting Line Steel Preload Calculation for Multi Cavity Injection Moulds
Calculate multi cavity parting line preload by balancing machine clamp force against internal hydraulic separation force to maintain positive shut-off land sealing stress.
T1 Tool Qualification
Meaning
Initial sampling phases mark the first time a new mould is run in a production press to produce parts. Reaching t1 tool qualification involves checking the basic function of the mould and ensuring that it can produce a full part without crashing. These parts are usually not dimensionally perfect and are used to identify the need for steel changes or cooling adjustments.
This step is the bridge between tool construction and mass production.
Sample Evaluation
Inspecting the first shots from the mould reveals defects like shorts, flash or burn marks. During t1 tool qualification, the focus is on the mechanical operation of the slides, ejectors and hot runner. These samples provide the engineering team with a physical part to compare against the original design intent.
Dimension Check
Measuring the parts from the first run identifies where the steel needs to be removed to meet the final specifications. Most tools are built steel safe, meaning the cavities are slightly smaller than needed to allow for final tuning after t1 tool qualification. This approach prevents the need for expensive welding to add metal back to the tool.
Corrective Action
Documenting every issue found during the trial creates a roadmap for the tool shop. Once the t1 tool qualification is complete, the mould returns to the bench for final polishing and fitment. Successful completion of this phase moves the project closer to the final approval.