What Is a Gear Hobber?

Gear hobbing machine is the most widely used machine tool in gear processing machine tools. It can cut straight and helical cylindrical gears, and can also process worm gears, sprockets and so on. A gear processing machine for machining straight, helical and herringbone spur gears and worm gears using a hob in accordance with the development method. This machine tool can also process various special toothed workpieces such as splines and sprockets when using special hobs. The machining accuracy of ordinary gear hobbing machines is grade 7 ~ 6 (JB179-83), and the precision of gear hobbing machines is grade 4 ~ 3. The maximum processing diameter is 15 meters.

(1) Cylindrical helical gears and worm gears are produced in small batches and in single pieces, and spline shafts with a certain parameter range can also be rolled.

(2) Easy adjustment, with automatic parking mechanism

(3) It has a reliable safety device and an automatic lubrication gear hobbing machine. It is the most widely used machine tool in gear processing machines. It can cut straight and helical cylindrical gears, and it can also process worm and sprocket wheels. Wait.

The hobbing machine is divided into vertical and horizontal according to the layout. Large and medium gear hobbing machines are mostly vertical, small gear hobbing machines

Efficient hobbing machines appeared after the 1960s, mainly using carbide hobs for high-speed and high-feed hobbing

It is mainly used to process bevel gear teeth such as straight teeth, helical teeth, and extended trochoidal teeth.

Straight bevel gear gear planer uses paired planer blades to produce coarse and fine-cut straight bevel gear machine tools according to the development method. There are machine tools that can also plan helical bevel gears, which are most widely used in small batch production.

The double-cutter straight-bevel gear milling machine uses two staggered milling cutters to mill the left and right tooth surfaces of the same cogging according to the development method. The production efficiency is high and it is suitable for batch production. Due to the relative movement of the milling cutter head and the workpiece in the toothless length direction, the bottom of the cogged groove is arc-shaped, and the tooth width of the processing module is limited. This machine tool can also be equipped with automatic loading and unloading devices to achieve single machine automation.

A large-diameter broaching cutter head of a straight tooth bevel gear broaching machine rotates once, and a cogging machine is cut out from the solid wheel blank by the forming method. Its bevel gear cutting machine tool has the highest productivity. Due to the complexity of the tool and the high price, each workpiece requires a special cutter head, which is only suitable for mass production. Machine tools are generally equipped with automatic loading and unloading devices.

Spiral bevel gear milling machine uses arc bevel gear milling cutters to roughen and finish the curved bevel gear hypoid gear machine according to the forming method. There are variants such as precision cutting machine and roughing machine gear drawing machine.

Spiral bevel gear grinding machine is used to grind hardened arc bevel gears to improve the accuracy and smoothness of the machine. Its structure is similar to that of bevel gear milling machines, but it uses a grinding wheel instead of a milling cutter and is equipped with a dressing wheel It can also grind hypoid gears.

The extended epicycloid bevel gear milling machine uses an extended epicycloid bevel gear milling cutter head, or a double-blade combined end face milling cutter head, which continuously divides the teeth according to the development method. During tooth cutting, the workpieces of the milling table of the cradle are continuously rotated, and the workpiece is reciprocated once by the cradle as the feed motion. The continuous rotation of the milling cutter workpiece allows the workpiece to obtain a continuous index of a certain number of teeth, and forms a tooth length curve. The additional movement of the cradle to rotate the workpiece is combined to produce a generating movement, so that the workpiece obtains a tooth profile.

The taper hob for quasi-involute bevel gear milling machine is used to continuously index the gear cutting machine according to the development method. When cutting teeth, the taper hob first cuts with the large end and then cuts with its smaller diameter. In order to ensure the same cutting speed throughout the cutting process, the machine tool relies on the stepless speed change device to control the hob speed to cut the teeth. For continuous rotary motion, machining a workpiece, the rocking table reciprocates once. The rotation of the work piece of the cradle generates a generating movement through the differential mechanism, so that the work piece obtains a tooth profile curve with a constant height along the tooth length. ^[3]

Rolling gear parameter introduction

Type: Hobbing machine

Model: Y3180

Processing accuracy level: 8

Maximum machining teeth: 250 Maximum machining modulus: M10

Power of main motor: 3 (kw)

Processing diameter range: 800 (mm)

Weight: 6800 (kg)

Power type: mechanical transmission