Ball Mill Large Gear Ring Cast Steel Tooth Surface Fine Grinding Customization

Technical Requirements
1) Surface hardening pretreatment is normalizing, with a hardness of HB210-250. Mechanical properties are: ultimate strength Rb690MPa, yield strength Rs490MPa, elongation D511%, reduction of area W25%, and impact toughness Ak30J. Gear teeth are induction hardened to a hardness of HRC50-55, with an effective hardened layer depth of 3-5mm.
2) Ultrasonic flaw detection is performed throughout the gear, and internal quality must meet the Class II requirements specified in GB7233-87. Magnetic particle inspection is also performed on the gear teeth and transition fillets, and quality must meet the Class II requirements specified in GB/T9444-88.

Gear Ring Manufacturing Process
2.1 Blanks
Steel casting blanks are provided by the factory and manufactured in accordance with GB11352-89. Castings are molded, melted, poured, boxed, cleaned, and trimmed according to the casting process requirements. During inspection and acceptance, the steel castings are inspected according to the drawings and technical requirements. Once qualified according to JB/T6402-92, they are released to the next process.
2.2 Rough Machining: Marking and machining allowances are performed according to the drawing requirements, followed by alignment, connection, machining of internal and external circumferences, milling of mating surfaces, and drilling.
2.3 Flaw Detection: Ultrasonic flaw detection is performed throughout the entire casting. Internal quality should meet the Class II requirements specified in GB7233-87.
2.4 Normalizing Pretreatment: Pairs of half ring gears are normalized and tempered to provide a good microstructure for subsequent surface hardening. The half ring gears are inspected for post-heat treatment deformation according to the drawing requirements. 2.5 Final Inspection
First, after medium-frequency quenching and tempering, check the hardness of each tooth groove of the ring gear to ensure it meets the drawing requirements. Second, check whether the maximum outer diameter (D6944) has increased. If the deformation is 3mm, mechanical correction is required until it meets the requirements. Third, perform a magnetic particle inspection on the gear teeth and transition fillets. The quality should meet the second level requirements specified in GB/T9444-88. Finally, conduct a final inspection according to the drawings and technical requirements.

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