Auto Spare Parts Front Brake Disc(Rotor) for OE#569077/13502826/13586854/13585826/13512340

• Being a world leading professional brake parts manufacturer, Winhere produces more than 55 million units of brake discs and 10 million sets of brake pads annually for OEM and IAM. 

• 96%+ car parc coverage of brake discs and brake pads from A to Z for both passenger cars and commercial vehicles. 

• IATF16949, ISO14001, ISO45001, ECE R90, CNAS certificated. 

• National Green Manufacturer and China’s Champion Enterprise awarded by M.I.I.T. and C.F.I.E. 

• National Standard of “Brake Disc for Automobile” GB/T 34422-2017 is led by National Quality Supervision and Inspection Center for automobile parts, Winhere is the responsible drafting company for this national standard.

Casting Stage

1. Raw Material Melting & Composition Control

   High‑carbon grey cast iron (G3000 / GG15HC) is adopted. Strict chemical‑composition control for carbon, silicon, manganese, sulfur and phosphorus elements. Adjust carbon‑equivalent value to achieve required mechanical properties: hardness, tensile strength and thermal‑fatigue resistance. Raw material incoming inspection is carried out for every batch.

2. Mold Casting

   Sand‑casting production line forms brake disc blanks. The internal ventilation vanes of ventilated discs are formed by pre‑placed sand cores. Precise core positioning is critical: mis‑alignment will cause uneven vane thickness, unbalanced weight and poor heat dissipation. After casting, rough blanks go through shake‑out, riser cutting and stress‑relief annealing to eliminate internal casting stress, preventing later‑stage deformation.

Machining Stage (CNC Turning & Grinding)

1. Rough Turning

   
   

   Blank is clamped on CNC lathe. Remove casting skin and excess material; rough‑machine outer diameter, inner bore, mounting hat face and thickness reserve allowance for finish processing.

2. Finish Turning

   Precision turning of mounting surface, center bore, wheel bolt holes and screw holes. Guarantees concentricity of hub hole, flatness of mounting face and position tolerance of bolt holes, to realize OE‑level bolt‑on fit.

3. Friction‑Surface Grinding

   Double‑surface grinding for two braking faces. Tightly controls total thickness variation(TTV) and lateral run‑out. This step directly avoids brake pulsation, steering‑wheel shudder and uneven pad wear.

Post‑process & Surface Treatment

1. Deburring & Cleaning

   Remove sharp burrs on holes and edges; clean metal chips from internal ventilation channels. Residual metal chips inside vanes will trigger dynamic‑balance failure and abnormal noise.

2. Anti‑rust Treatment (Only for hat & non‑friction zone)

   Options: anti‑rust oil, spray paint, electrophoretic coating, zinc‑rich dust coating.

Manufacturing note: Friction surfaces are fully masked during coating. Paint/oil contamination on friction surfaces is strictly forbidden, otherwise it leads to fading braking performance. Multiple finished colors available: gray(as‑cast), black, bare‑metal silver, golden coating.

Quality Control In‑line & Final Inspection

1. Dimension Inspection: Outer diameter, total thickness, center bore, PCD bolt‑hole dimension measured per batch.

2. Dynamic Balance Testing: Each ventilated disc passes dynamic‑balance correction. Ventilated rotors have complex inner‑vane structure; unbalance weight will cause high‑speed brake vibration.

3. Hardness Test: Spot‑check hardness of friction surface to ensure stable friction property. Too‑low hardness causes fast wear; over‑high hardness leads to brake noise.

4. Visual check: Inspect for casting defects: shrinkage cavity, porosity, crack, sand inclusion. Defective blanks are eliminated before finishing.

Packaging Process

Qualified units can be packed as individual inner box, export carton, pallet stacking or bulk packing according to customer order. For sea‑going containers, moisture‑proof measures are added to protect discs from salt‑spray corrosion in long‑distance ocean transit.

Production‑level Differentiator

• Stress‑relief annealing for cast blanks, reduces deformation risk under repeated high‑temperature braking. Many low‑cost manufacturers skip this procedure.

• Strict sand‑core positioning for ventilated‑vane geometry, uniform air‑channel dimension for consistent heat dissipation.

• Double‑surface grinding instead of only turning friction faces.

• 100% dynamic‑balance inspection for ventilated brake discs.

• Full traceability for raw‑material batches.

• 100% critical dimensions, runout and DTV inspection 

• Material physical and chemical inspection

• Test shear strength, compressibility, density, flatness and parallelism 

• Test performance and noise/NVH