Injection‑Molding Machine
Injection‑Molding Machine
Multiple domestic manufacturers for bidding. Free publication. Price to be negotiated between winning bidder and buyer.
Information required for inquiry posting:
- New or used; 2. Machine type requirement (hydraulic, servo‑hydraulic hybrid, all‑electric); 3. Clamping force tonnage; 4. Shot volume; 5. Screw type; 6. Brand scope requirement; 7. Purchase quantity
表格
| Type | Power Source | Core Advantages | Main Limitations | Ideal Application Fields |
|---|---|---|---|---|
| Hydraulic Injection‑Molding Machine | Hydraulic cylinders & hydraulic pump | High clamping force (100‑4000+ tons); suitable for large & complex parts; mature proven technology; lower initial investment; robust construction. | High energy consumption; relatively limited precision & speed; risk of hydraulic‑oil leakage. | Automotive bumpers, instrument panels, large pallets, home‑appliance housings and other large or deep‑cavity articles. |
| All‑Electric Injection‑Molding Machine | AC servo‑motor driven | Ultra‑high precision & repeatability; 30‑70 % energy‑saving vs hydraulic; oil‑free for clean‑room use; low noise and fast response. | High upfront investment; limited clamping force by motor power; not for extra‑large components. | Medical devices (syringes, infusion vials), precision electronics (phone connectors, SIM sockets), optical lenses. |
| Hybrid Injection‑Molding Machine | Servo‑motor plus hydraulic system | Combines merits of both: energy‑saving performance of electric type together with high clamping‑force of hydraulic type; balanced performance & adaptability. | Relatively complex structure; higher technical requirements for maintenance; medium‑to‑high initial cost. | Automotive components and high‑end consumer electronics (e.g. phone housings) requiring both precision and high output force. |
Classification by layout: space and mold compatibility
‑ Horizontal injection‑molding machine: Most widely‑used configuration. Injection unit and clamping unit arranged horizontally. Low centre‑of‑gravity, stable operation. Parts can drop automatically after ejection, easy for full‑auto production; convenient feeding and maintenance. Suitable for most products especially medium‑&‑large‑size articles; crane required for mold mounting.
‑ Vertical injection‑molding machine: Injection and clamping axes vertical. Footprint approx. half of horizontal machines. Mold faces upward; very convenient for accurate insert loading, ideal for parts with metal inserts (plugs, electronic connectors). Parts seldom drop automatically upon ejection; mostly small‑size machines below 60 g shot weight.
‑ Angle / special‑structure injection‑molding machine: Injection direction lies on same plane as mold parting surface. Intermediate layout between vertical and horizontal. Well‑suited for side‑gate molds or flat parts where gate marks on product centre are forbidden. Variants include multi‑station rotary presses for high‑volume articles such as shoe soles, and C‑frame machines dedicated to power plugs.
Core Technical Specifications: Key Selection Indicators
Clamping Force (ton, t): Primary parameter of machine size, representing maximum force resisting mold opening driven by molten plastic. Range: 5 t to over 4000 t. Calculation reference: Required clamping force (t) = projected area on parting surface (cm²) × plastic pressure coefficient (t/cm²). Reserve 10‑20 % safety margin.
Shot Volume (g or cm³): Maximum plastic volume injected in air‑shot condition. Recommended total part weight including sprue & runner shall occupy 25‑75 % of machine shot capacity for stable plasticizing and molding quality.
Clamping Unit & Platen Dimensions: Determine whether target mold can be installed and demolded. ‑ Tie‑bar clearance (mm): Maximum mold footprint width & length. ‑ Maximum mold opening stroke (mm): Sum of maximum mold thickness and opening travel. ‑ Mold opening travel (mm): Sufficient clearance for smooth part ejection.
Clamping‑mechanism type (hidden parameter affecting mold service‑life & precision): ‑ Toggle‑type: Fast motion, low energy consumption, mainstream design; clamping‑force not easily measured directly. ‑ Direct‑pressure type: Uniform platen stress, long mold service‑life, precise clamping‑force control; slower response and higher energy consumption. ‑ Two‑plate / composite direct‑pressure: Combines above advantages, compact structure, long stroke for large deep‑cavity parts; lowest cycle speed.
Selection Guidelines
Follow clear logic for injection‑molding‑machine selection:
Determine machine type by product requirements: All‑electric preferred for precision electronic parts; hydraulic for large automotive components; hybrid for mixed requirements. Vertical machine is preferred when frequent insert loading is needed.
Check dimensional compatibility against mold drawings: Verify tie‑bar clearance, platen size and opening travel to guarantee mold mounting and proper mold‑opening movement.
Calculate required clamping force based on material and projected part area.
**Select proper shot volume according to total part weight to ensure full filling.
Participation Process
Manufacturers: Contact supplier service for supply registration.
Buyers: Click group‑purchase or contact procurement service to submit requirements. The platform filters suppliers from database or releases bidding based on aggregated demands. Buyers select competitive suppliers and sign sales contracts.
