Explosion Proof Motor End Cover Processing Technology Resin Sand Mold End Cover Casting High Precision Bearing Chamber T

This case demonstrates the complete processing flow of explosion-proof motor sealed end covers, covering from casting blanks to precision machining. As a key component of explosion-proof motors, the processing quality directly impacts the motor's explosion-proof performance and sealing reliability. Through resin sand molding, precision turning, and flameproof surface treatment, the end cover complies with GB 3836 explosion-proof standards.

1. Casting Process Resin sand molding is used: 60-mesh desert scrubbed sand with 1.0%-1.2% furan resin and 0.4%-0.7% toluenesulfonic acid curing agent. After core assembly, bottom pouring rain-type casting is adopted, with electric furnace melting of iron liquid (cast iron/cast aluminum可选). Blanks are cleaned and anti-corrosion coated.
2. Turning Process
   • Rough Machining: Rough milling of end faces and base foot surfaces with a boring mill; rough turning of bearing chamber planes and inner holes on a vertical lathe using end cover inner holes for positioning.
   • Drilling: Drilling of end face holes and threaded holes with specialized jigs to ensure hole position accuracy.
   • Finish Machining: Finish turning of bearing chambers (accuracy ±0.02mm) and finish milling of end faces; strict control of bearing chamber depth and flatness.
   
3. Flameproof Surface Treatment Flameproof surfaces (e.g., end cover and motor body junction) allow minor defects (diameter <0.5mm, depth <1mm) but require hole spacing ≥3mm. Fire-resistant coating is applied post-machining to protect against damage.
4. Quality Control
   • Blank Inspection: Check for sand holes and porosity per "Explosion-Proof Motor Casting Dimensional Standards".
   • Precision Inspection: Measured with depth gauges, bearing chamber thickness gauges, etc..
   • Explosion-Proof Tests: Include air tightness tests (pressure ≥1.5x working pressure) and flameproof shell pressure tests.

• Challenge 1: Insufficient Bearing Chamber Accuracy→Solved by two-stage turning (rough/finish) on vertical lathes with unified positioning benchmarks.
• Challenge 2: Poor Flameproof Surface Sealing→Add high-quality gaskets (asbestos/rubber) with controlled compression for elasticity.
• Challenge 3: Inefficient Heat Dissipation→Optional water cooling ring structure with heat conduction plates for heat分流.

This processing technology has been applied to end covers for explosion-proof motors in petrochemical inspection robots and coal mine rescue robots, meeting Ex d IIB T4 certification and适应 -40°C extreme cold environments.

Custom processing based on client drawings, with material selection (cast iron/cast aluminum/stainless steel), cooling solutions (natural/water cooling), and explosion-proof grade customization (e.g., Ex d IIC T6).

Provide process design consultation, explosion-proof certification guidance, and batch production quality tracking. Short processing cycles and significant cost optimization for large-scale production.