Characteristics and processing process of spiral bevel gears

A spiral bevel gear is a mechanical transmission part that can drive smoothly according to a certain transmission ratio. It is widely used in oil field petrochemical machinery and various industrial and machine tool applications. The general names are: spiral bevel gear, spiral bevel gear, spiral bevel gear, arc bevel gear, spiral bevel gear, etc.

 

spiral bevel gears

 

The gear of the spiral bevel gear is conical, like an umbrella, and has many advantages such as high transmission efficiency, stable transmission ratio, low noise, and long service life.

Among various types of mechanical transmission structures, spiral bevel gears have the highest transmission efficiency and have great economic benefits for various types of transmissions, especially high-power transmissions. Moreover, the space required for transmission parts to transmit the same torque is larger than that required for belt and chain transmissions. The space is much smaller.

The tooth line of spiral bevel gears is curved, so the manufacturing process is more difficult than that of straight bevel gears. Next, we will introduce the processing process of spiral bevel gears.

The processing of spiral bevel gears must first use high-quality alloy steel materials. It is best to purchase high-quality materials directly from the material manufacturers and then conduct professional forging to improve the tightness of the material structure. The machined workpiece is held in a fixture and the edges of the workpiece are inset by using cutter blades with cutting heads extending radially outwards. These insets create a convex profile on the gear teeth. The workpiece is kept motionless during the cutting process, while the milling cutter processes the surface of the gear in a straight line through the cam, essentially parallel to its root line, so that a straight tooth base can be produced, while the movement of the cutter and the cutter The combination of blade shapes produces the desired bevel tooth shape. What needs to be done after milling the teeth is to pair the rolling inspection machine, and then remove the burrs; after the burrs are removed, they need to be heat treated. After the heat treatment, the teeth are ground; some bevel gears with higher precision requirements also need to be ground. Tooth processing, after these several processes, the spiral bevel gear is processed.

 

1. Rough machining of the teeth of the spiral bevel gear blank

 

Use a high-precision CNC lathe to process the front and rear cones of the spiral bevel gear blank;

 

2. Rough milling teeth

 

Use a spiral bevel gear milling machine to rough mill the teeth of the turned spiral bevel gear blank, mesh and colour, control the length and height of the meshing surface, and leave a machining allowance for the tooth thickness;

 

2. Let the knife reach the edge for processing

 

After completing the rough machining of the teeth, continue to process the tooth root of the spiral bevel gear blank on the spiral bevel gear milling machine to bring the cutter angle to the finished size;

4. Heat treatment of spiral bevel gear

 

Carburizing and quenching heat treatment is performed on the semi-finished spiral bevel gear; the carburizing and quenching heat treatment include the following steps:

 

a. Cleaning before entering the furnace

 

Immerse the heat treatment basket containing the semi-finished products of the spiral bevel gear into the cleaning pool to clean the spiral bevel gear and remove residual dirt on the surface of the spiral bevel gear;

 

b. Carburizing treatment

 

Place the heat treatment basket that has been cleaned before entering the furnace into the carburizing furnace as a whole, and control the temperature of the carburizing furnace to perform step heating and insulation;

 

c. Isothermal quenching treatment

 

Place the entire heat treatment basket that has completed carburization treatment into the cooling oil pool for isothermal quenching and cooling;

 

d. Cleaning after quenching

 

Immerse the heat treatment basket that has completed the quenching treatment into the cleaning pool to clean the spiral bevel gear and remove residual oil stains on the surface of the spiral bevel gear;

5. The ring gear is ground on the internal hole grinding machine to ensure that the ring gear runout is ≤0.05mm; the shaft teeth are ground on the cylindrical grinding machine to ensure that the outer circle runout is ≤0.02mm;

 

6. Hard scraping tooth surface processing:

 

Install the semi-finished spiral bevel gear that has been finished with the mounting shaft or mounting hole on the spiral bevel gear milling machine for milling and hard tooth surface processing, while retaining the amount of grinding processing;

 

7. Hard tooth surface grinding:

 

Install the semi-finished spiral bevel gear with hardened tooth surface milling on a bevel gear grinding machine to grind the tooth surface to the finished product size, improve the surface precision of the tooth surface, and eliminate meshing marks;

 

8. Finished product inspection.

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