Ingeniørkontekst
A moldable gear is more than a tooth form placed on a hub. The web, hub, gate, wall transitions and ejection strategy influence the finished tooth geometry.
Uniform sections and balanced geometry help cooling, while abrupt thick-to-thin transitions can create sink or differential shrinkage. Tooth tips and roots also need to release from the tool without damage.
Gear teeth themselves may be thin while the hub is relatively heavy. That thickness contrast is a classic source of uneven cooling. A webbed or cored hub can sometimes improve molding balance, but the redesign must still carry torque from the bore to the teeth. DFM should therefore connect flow and cooling recommendations to the mechanical load path instead of treating them as separate objectives.
Hva tegningen skal formidle
Review tooth geometry together with hub diameter, web thickness, bore features, gate location, parting line and the expected shrinkage of the selected resin.
Legg disse inndataene på den kontrollerte tegningen, spesifikasjonen eller vedlegget til tilbudsspørsmålet der det er mulig. Å holde dem unna uformelle meldingstråder gjør det enklere å håndtere leverandørsammenligninger og senere revisjoner.
Risikovurdering
Late changes to hub or wall geometry can move the process window after the gear tooth design was already frozen.
Prøveaksept
Inspect first samples for both gear characteristics and molded-part effects such as runout or distortion.
For Plastic Gear Design for Injection Molding, close the DFM loop by updating the controlled CAD/drawing and sample plan. A recommendation that never reaches the released revision cannot be inspected consistently in production.
Fra designgjennomgang til tilbudsspørsmål
Before requesting a price for plastic gear design for injection molding, identify the current drawing revision, production quantity, material constraint and the feature that most strongly affects function. Ask the supplier to flag any deviation from those inputs in the quotation so technical alternatives stay visible.
Praktisk designgjennomgang for denne avgjørelsen
Material selection should connect the polymer to the function and manufacturing route. Review temperature, moisture, chemicals, stiffness, wear pair, dimensional stability and exact grade requirements. A material that performs well in isolation can still be a poor choice when the mating surface or inspection condition is different.
Registrer forutsetningene på tegningen eller i tilbudsforespørselen slik at leverandøren kan bekrefte dem før tilbudet gis. Når en verdi er ukjent, identifiser den som en åpen konstruksjonsvare i stedet for å kopiere et generisk katalognummer som kanskje ikke samsvarer med monteringen.
Verifiseringsark
- Service temperature
- Moisture / chemical exposure
- Load and stiffness need
- Wear pair / lubrication
- Dimensional-stability priority
- Exact grade or approved substitution limits
Bruk den første prøven til å lukke disse punktene med både dimensjonsdokumentasjon og relevant funksjonskontroll. Eventuelle aksepterte avvik bør fanges opp i den kontrollerte revisjonen før gjentatt produksjon.
