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Address:
West side of National Highway 106, Shimengqiao Town, Renqiu City, Hebei Province
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Southeast Asia Series Sprocket HACHI-1
Southeast Asia Series Sprocket HACHI-1
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- Product Description
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Product Introduction
Materials
- Small sprocket (drive): 1045, 1023, 20CrMnTi, 20Cr (carburized and quenched, HRC 45–60)
- Large driven sprocket: 45# steel, Q235 (quenched and tempered, HRC 28–32; or through-hardened, HRC 45–55)
Our company’s manufacturing processes are mainly divided into two types: stamping and forging.
I. Stamping
- Blanking: Roll forming/steel plate shearing and blanking
- Precision punching/blanking of gear teeth: precision die + press, producing tooth profile, center hole, and weight-reduction holes in a single stroke.
- Leveling: Ensure flatness
- Deburring and chamfering
- Heat Treatment: Through-hardening/Quenching and Tempering (large gears), Carburizing and Quenching (small gears)
- Surface Strengthening: Shot Peening (to Enhance Fatigue Strength), Phosphating/Black Oxide Coating/Paint Baking
- Inspection: tooth profile, hardness, and concentricity (≤0.05 mm)
II. Forging + Machining (High Precision, High Strength, High-End/Heavy-Duty)
- Cutting: Cutting round steel bars
- Forging: Heating (1000–1200°C) → Upsetting → Forging in a Die → Punching → Normalizing (Stress Relief)
- Rough machining: turning end faces, external cylinders, and internal bores.
- Gear Tooth Machining: Hobbing/Shaping (Accuracy IT6–7)
- Finishing: Precision turning, reaming, and keyway milling
- Heat Treatment: Local Tooth Surface Quenching and Tempering (HRC 45–62)
- Post-processing: gear grinding, shot peening, and rust prevention
- Inspection: tooth pitch, runout, hardness,
III. Key Points for Critical Processes
- Gear tooth accuracy: hobbing > shaping > stamping; stamping can achieve Ra 1.6, while hobbing can achieve Ra 0.8.
- Heat Treatment: Carburizing and quenching for the small sprocket (hard surface, tough core); normalizing and tempering followed by tooth-surface quenching for the large sprocket.
- Surface Strengthening: Shot Peening (grain refinement, fatigue resistance); PVD Coating (TiN, service life increased by 3–5 times)
- Quality Control: Accumulated pitch error ≤ 0.03 mm; Hardness HRC 56–62; Concentricity ≤ 0.05 mm
IV. Process Comparison
- Stamping: low cost, high efficiency; suitable for small to medium batch production and general-purpose vehicle models.
- Forging: high strength, high precision; suitable for heavy-duty, high-end, and custom applications.
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Phone/WhatsApp
Address
West side of National Highway 106, Shimengqiao Town, Renqiu City, Hebei Province