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Product Details:
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| Features: | High Carrying Capacity And Smooth Operation | Product Name: | Small Gear, Big Ring |
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| Material: | GS42CrMo4 Alloy Cast Steel | Elongation: | D511% |
| Yield Limit: | Rs490MPa | Hardness: | HB210~250 |
| Impact Toughness Value: | Ak30J | Suitable: | Cement, Electric Power, Metallurgy, Chemical |
| Classification: | Mill Girth Gear | Warranty: | 12 Months |
| High Light: | Cast Steel Big Mill Girth Gear,GS42CrMo4 Big Mill Girth Gear,GS42CrMo4 Girth Gear Ring |
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GS42CrMo4 Alloy Cast Steel Big Mill Girth Gear Ring Tooth Ring Of Mill Girth Gear
1. Manufacturing process of big tooth ring for mill girth gear
(1) Blank
The steel casting blank is provided by the heavy casting and forging Plant of CITIC Heavy Industry Machinery Co., LTD. It is implemented in accordance with gb11352-89 standard. Molding, smelting, pouring, box beating, cleaning and dressing castings according to casting process requirements; During the inspection and acceptance, the cast steel blank shall be checked according to the drawings and technical requirements, and the process shall be put down after passing the acceptance according to JB/T6402-92 standard.
(2) Rough machining
Draw lines according to the requirements of the drawings and set aside processing allowance, alignment, connection, processing inner and outer circle, milling joint surface, drilling and other processes.
(3) Agent injury
Ultrasonic inspection shall be carried out on the whole, and the internal quality shall meet the secondary requirements of GB7233-87 standard.
(4) Normalizing pretreatment
The half ring is normalized and tempered in pairs to provide good microstructure for subsequent surface quenching. And according to the requirements of the drawings to check the deformation of half gear ring after heat treatment.
(5) Machining
The first two half ring with high strength bolt connection into a whole ring, according to the requirements of the drawings processing of the whole ring circle and upper and lower end, and then according to the drawings and machining requirements for milling teeth.
(6) Eliminate machining stress
The integral ring is annealed to eliminate stress.
(7) Surface quenching of integral gear ring
Tooth surface medium frequency induction quenching along the tooth groove, hardness HRC50~55, effective hardening layer depth 3~5mm.
(8) Final inspection
Firstly, test whether the hardness of each groove of the gear ring after intermediate frequency quenching and tempering meets the requirements of the drawing; Secondly, detect whether the size of the maximum outer diameter D6944 is too large, such as the deformation of 3mm, need mechanical correction until qualified; Thirdly, for magnetic particle inspection of gear teeth and transition fillet, the quality should meet the secondary requirements stipulated in GB/T9444-88 standard; Finally, according to the drawings and technical requirements for the final inspection.
2. Product parameters of big ring for mill girth gear
| The big gear ring |
⑴GS42CrMo4 alloy cast steel (enterprise standard) HB 220 ~ 240 The half structure, Y type plate. (3) oblique tooth. (4) Reasonable sealing and alignment structure. |
⑴ Outside refining of molten steel furnace (argon blowing and R-H vacuum treatment). (2) The special cold mold sand hanging technology is adopted to ensure the density of casting and tooth. (3) Normalizing treatment (proprietary technology) to ensure tooth surface hardness. (4) After rough hobbing, release aging, repair the joint surface, and then fine rolling ⑸ homemade hob precision hobbing. |
⑴ Mechanical properties and chemical composition of casting blank (internal control standard). (2)The ultrasonic crack detection after rough machining. ⑶ half finishing, finishing ultrasonic inspection and magnetic particle inspection. (4) Tooth surface magnetic particle inspection, hardness inspection. ⑸ Check tolerance of tooth profile. ⑹ No-load test of general assembly before delivery, check the meshing accuracy of large and small gears. |
Contact Person: Mr. David
Tel: 86-18637916126
