Large Casting Steel Involute Gear Ring Spur Mill Girth Gear For Mining Machine

spur gear, helical gear, internal spur gear, ring gear, straight/spiral bevel gear, hypoid gear,

crown wheel & pinion, gear shaft, worm gear & worm shaft, spline shaft & bushing, etc.

Steel: C45, 40Cr <AISI/SAE 5140>, 42CrMo <AISI 4140/4142>, 20CrMnTi, 20CrNiMo <AISI/SAE 8620>, ect.

Aluminum Alloy: 2024, 7075, etc. <we advise these instead of 6061/6063>

Brass, Bronze, Aluminum Bronze, etc.

POM Plastic, MC901 Nylon, etc.

blank turning

tooth hobbing, broaching, milling, shaping, etc.

bore honing

tooth shaving, tooth grinding

tooth induction quenching, vacuum quenching, etc. for 45-50HRC;

carburizing for 56-62 HRC;

nitriding, carbon-nitriding for gears required abrision resistant;

processing

measure

processing

equipment

1

prepare

1. Material: high quality cast steel

2. Formulate reasonable casting process and ensure casting quality by means of computer simulation of solidification

3. Formulate reasonable smelting process to ensure the chemical composition of casting

4. Formulate reasonable heat treatment process to ensure

Verify the mechanical properties of the casting

2

modelling

1. Strictly control the quality of type (core) sand, ensure the strength and control of water

2. Sand tamping, inclined surface polishing, paint brush twice

3. Place the pouring riser and cold iron according to the process requirements

4. Clean and bake as required

cavity

sand mixer

Check the quality of type (core) sand and surface sand

2. Check the cavity size

Check the baking time

3

Smelting casting

1. Choose low S.P pig iron, select scrap steel, auxiliary materials and alloy of baking furnace according to process

2. According to special process smelting, make steel

S.P hazardous elements meet internal control standards

3. The finished molten steel is treated with argon blowing in the ladle and R-H vacuum circulation degassing to make the molten steel composition uniform, harmful oxygen (H, O) reduction, uniform temperature, increase the fluidity of molten steel, so as to ensure good liquid replenishing of the casting and prevent the casting from porosity and other defects

Strictly control casting temperature and casting speed according to the provisions

50 t furnace

R-h vacuum circulation degassing equipment for ladle argon blowing device

1. Furnace materials must meet the technological requirements

2. Control feeding temperature, feeding quantity, pure boiling time, steel temperature

3. The direct reading spectrometer is used to quickly detect the chemical composition in front of the furnace to ensure that the equipment is in the best state during melting and the chemical composition of the finished product meets the requirements during pouring

4. Check the parameters of argon blowing and R-H vacuum treatment

5. Check the starting temperature and

Pouring time

Direct reading spectrometer

The physical and chemical equipment

4

Cleaning and heat treatment

1. The internal heat preservation time of casting mold shall not be less than the process requirements

2. Sand falling, shot blasting, cutting and pouring risers meet the technological requirements

3. Strictly carry out the blank heat treatment

To ensure the uniformity of furnace temperature and refine the original structure of casting

50t

Inert falling sand machine and

8.5 ×12m

Heat treatment furnace

1. Check the furnace temperature record

2. The sample is heat-treated with the casting in the same furnace, and the mechanical properties are sent to be checked immediately

3. Check the surface quality of the blank

Quantity, geometric dimension and machining allowance

The physical and chemical equipment

5

1. Reserve allowance for rough machining according to technological provisions

Artificial aging treatment

Vertical lathe

8.5 ×12m

Heat treatment furnace

Check the size

Visual inspection for defects ultrasonic inspection

Ultrasonic

Testing