Moulds for technical parts

High-precision tooling for your high-value parts

The Injection moulds for technical parts meeting the most complex requirements: under-cut geometries, tight tolerances, integration of mechanical functions (clips, hinges, threads), critical appearance areas, or high mechanical stresses. They incorporate advanced features such as drawers, mobile cores, specific ejectors, conformal cooling and differentiated thermal systems.

At Hybster, we design and supply technical moulds for demanding sectors: electronics, automotive, mobility, lighting, medical, EV charging. Our integrated approach guarantees an optimal balance between complexity, reliability and unit production cost.

What is a technical part mould?

A mould for a technical part is distinguished from a standard mould by its ability to reproduce geometries that cannot be demoulded with a simple two-plate mould. Typical features:

• Mechanical movements side cores, sliding cores, jaws to form undercuts, through holes or external threads.
• Multi-stage ejection Combining cylindrical, flat, blade, and sleeve ejectors for deformation-free demoulding.
• Advanced thermal regulation conformal cooling (channels following the mould geometry manufactured by additive manufacturing), differentiated hot/cold zones.
• Overmoulded metal inserts integration of brass threads, electrical contacts, metal shafts directly into the component.
• Tight dimensional tolerances DIN 16742 TG3 precision or higher for critical assembly functions.

When to opt for a technical mould?

• Undercut part impossible to demould with simple axial demoulding.
• Integration of mechanical functions External threads, fastening clips, plastic hinges.
• Overmoulding of metal inserts or of previously injected parts (process bi-material"bi-injection 2K.
• High mechanical stress structural parts to avoid weld lines sequential injection critiques.
• Cycle time critique for high-volume production: conformal cooling for a 20–40% improvement.

To understand the manufacturing constraints for technical plastic injection moulded parts, consult our dedicated article: Plastic injection of technical parts. For parts combining rigid and flexible elements, see our two-component moulds (2K injection).

The available technical devices

Drawers and movable cores

The side and moving cores allow for external or internal undercuts to be created: side openings, external threads, dovetail forms. Activated mechanically (cams) or hydraulically, they retract before ejection to release the part.

Conformal cooling

Le conformal cooling consiste à intégrer des canaux de refroidissement dans la géométrie de la pièce elle-même. Cooling which follow the geometry of the impression, manufactured by Direct Metal Laser Sintering (DMLS). Benefits: reduced cycle time (20–40%), improved part flatness, reduced internal stresses. Applicable to critical mould cavities only (hot spots or areas that are difficult to cool).

insert moulding

The mould incorporates a precise positioning device for metal inserts (brass threads, pins, contacts, captive nuts). The insert is placed manually or by robot before injection, and then the polymer is moulded around it to create an inseparable assembly.

Sequential injection (cascade)

For large parts (bonnets, dashboards), several injection points are opened/closed at precise moments to control the flow and eliminate weld lines. Requires a system with hot runner with shut-off nozzles.

Preferred materials for technical parts

• Fibre-reinforced polyamides (PA6-GF, PA66-GF) : rigidity, high mechanical strength. See our catalogue PA.
• POM (acetal) Dimensional accuracy, low coefficient of friction, ideal for gears.
• PBT, PET-GF excellent dimensional stability, electrical insulation.
• PC/ABS, PC Shock resistance, rigidity, possible transparency.
• PEEK, PSU High-performance materials for medical, aerospace, and high-temperature applications.

Our approach to your technical moulds

Deep dive into DFM

Detailed analysis of your technical part: mouldability feasibility, functional ergonomics, rheological simulation to anticipate weld lines and warpage. This is the most critical step for the successful creation of a technical mould.

2. Detailed Conception

Integration of mechanical devices (drawers, cores, ejection), the thermal system (conformal cooling if applicable), and the power supply (hot channels (very large series). Choice of steels according to constraints (1.2767, 1.2316, H13).

3. Manufacturing by specialist partners

Technical moulds require experienced mould makers for complex movements. Hybster selects its partners according to complexity (France, Eastern Europe, or China for certain projects) with systematic technical monitoring.

4. Extended focus

Technical moulds require a longer setting-up period (2-5 days in the press) to optimise all parameters: cavity balancing, movement synchronisation, part finishing. Hybster oversees this critical phase.

Indicative costs and timescales

• 1-2 side slider technical mould £15,000 to £35,000, 8 to 14 weeks.
• Multi-cavity mould (4-8 impressions) with drawers £35,000 to £80,000, 12 to 18 weeks.
• Technical mould with conformal cooling additional cost of €5,000 to €15,000 for DMLS printed insert.
• Insert overmoulding mould €25,000 to €70,000 depending on complexity and automation.

To go further

• Supplementary article: Plastic injection of technical parts.
• Two-component injection moulding 2K two-component injection moulding.
• Full offer: Hybster plastic injection moulds.
• For large series: hot runner mould.