Venting Parts Plastic Injection Molding

Plastic injection molding for venting parts

Venting and blower housings are large parts with many holes, bosses and openings. Every hole is an obstacle the melt has to flow around, which creates weld lines and makes the cavity harder to fill than a plain housing of the same size. We mold these parts in ABS for venting equipment manufacturers in Europe and America.

Planning before steel

For a large venting part, two forecasts decide whether the project succeeds:

• Filling forecast – where to gate, how many gates, where weld lines will fall and whether they will be weak or visible.
• Cost forecast – press size, cycle time and resin usage, because large parts make every second and every gram expensive.

Most venting parts are produced in lower volumes, so we also design the mold to keep tooling cost reasonable.

Tooling details

• Single cavity in 738H steel, a pre-hardened steel suited to large ABS cavities and good polishing.
• LKM standard mold base, cold runner.
• Venting and cooling designed for the long flow paths of a large housing.

We mold large ABS housings on our 250–400 T presses and check flatness and hole positions at T1, since these decide whether the housing assembles with the fan and motor.

How a project like this works

• Tell us what you need – the mold only, molded parts, or both, and your estimated annual volume.
• Send drawings – STEP, IGES, STL, DWG or PDF, or a sample. We sign off moldability in a DFM review.
• Quotation – tooling price, part price and a schedule, with steel, cavities and runner proposed.
• Mold design approval – you approve the 3D mold design before steel is cut.
• T1 samples + FAI report – production or mold shipment starts after your approval.

Shipping molds and parts

• Molds are cleaned, rust-protected, marked and checked against a shipment checklist: cooling circuits, sprue, locating ring, ejection and support pillars.
• Molds ship with drawings, a spare-parts list and the T1 process sheet.
• Parts are packed to your packing instruction and inspected before shipment.
• We ship to customers in Europe, the USA and Asia.

After-sales

Our after-sales team supports mold maintenance and modifications remotely and can supply spare inserts. Contact customerservice@precisemoulds.com.