Processing methods and precision characteristics of different types of small module gears

The machining methods and precision characteristics of different types of small modulus gears are described as follows, for reference and understanding.

XNUMX. Shaping

1. Types of processed products:

All kinds of straight teeth, helical teeth, herringbone teeth,Internal gear,rack.

2. Processing accuracy:

Grade 6, tooth surface roughness Ra0.8μm.

3. Machine tool equipment:

Small modulus gear shaper.

4. Processing features:

a. Generating principle, processing tooth profile with gear shaper.

b. It can process some things that can't be processed by hobbing and millinggear, Such as double gears, internal gears, etc.

Second, shaving

1. Types of processed products:

Straight and helical teeth.

2. Processing accuracy:

Grade 5, tooth surface roughness Ra0.4μm.

3. Machine tool equipment:

Shaving machine.

4. Processing features:

a. The tooth shape is processed by the free meshing motion of the gear shaving cutter and the workpiece without backlash.

b. Finish machining the tooth profile after gear hobbing and gear shaping.

Three, grinding teeth

1. Types of processed products:

Straight and helical teeth.

2. Processing accuracy:

Grade 3, tooth surface roughness Ra0.4μm.

3. Machine tool equipment:

Gear grinding machine.

4. Processing features:

a. Grind the gear tooth profile with the forming wheel according to the profiling method or the generative method.

b. It can process hardened gears with high tooth profile accuracy.

Four, hobbing

1. Types of processed products:

Various spur and helical gears.

2. Processing accuracy:

Grade 4, tooth surface roughness Ra0.8μm.

3. Machine tool equipment:

Various small modulus gear hobbing machines.

4. Processing features:

a. Hobbing and cutting with a forming hob, continuous cutting, high productivity.

b. The hardness of the workpiece material does not exceed 35HRC.

c. Rollable involute gear z>=14.Correct the cycloid gear z>=7.

d. The minimum modulus hob m=0.05mm.

Five, forming gear hobbing

1. Types of processed products:

Various spur and helical gears.

2. Processing accuracy:

Grade 6, tooth surface roughness Ra1.0μm.

3. Machine tool equipment:

Various small modulus gear hobbing machines.

4. Processing features:

a. It belongs to profiling, continuous cutting, and high productivity.

b. The hardness of the workpiece material does not exceed 30HRC.

c. Various tooth shapes can be processed, and undercutting will not occur when z<=14.

d. Tool life is lower than gear hobbing.

Six, grinding teeth

1. Types of processed products:

Straight teeth.

2. Processing accuracy:

Grade 7, tooth surface roughness Ra0.04μm.

3. Machine tool equipment:

Gear grinding machine.

4. Processing features:

a. Grinding wheel meshes with the workpiece. Adding abrasive in the tooth working surface, grinding the tooth surface, can process hardened hard tooth surface.

b. Correct the gear error and reduce the tooth surface roughness, but the tooth profile error cannot be eliminated.

Seven, pull the tooth (push the tooth)

1. Types of processed products:

Internal gear and rack.

2. Processing accuracy:

Grade 7, tooth surface roughness Ra1.25μm.

3. Machine tool equipment:

A broaching machine is used for broaching and a press machine is available for pushing.

4. Processing features:

a. The tooth profile can be pulled out on a special machine tool at one time.

b. There are forming broaching, tooth-by-tooth broaching, same tooth profile broaching and contour tooth broaching.

Eight, honing

1. Types of processed products:

Straight and helical teeth.

2. Processing accuracy:

Grade 6, tooth surface roughness Ra0.4μm.

3. Machine tool equipment:

Honing machine.

4. Processing features:

a. Honing the hardened gear with a honing wheel.

b. It can calibrate gear accuracy, reduce tooth surface roughness, and improve gear meshing performance.

Nine, punching teeth

1. Types of processed products:

Sheet-shaped internal and external gears.

2. Processing accuracy:

Ordinary blanking, grade 8, tooth surface roughness Ra0.16μm; full blanking, grade 7, tooth surface roughness Ra1.0μm.

3. Machine tool equipment:

Precision punch.

4. Processing features:

a. The tooth profile is processed on the punching machine with a punching die, which has high production efficiency.

b. The hardness of the sheet material is not more than 25HRC.

c. Gears with various tooth shapes can be processed, with a minimum modulus of 0.15mm.

XNUMX. Polished teeth

1. Types of processed products:

Straight teeth.

2. Processing accuracy:

Grade 7, tooth surface roughness Ra0.1μm.

3. Machine tool equipment:

Gear-throwing machine.

4. Processing features:

a. The polishing wheel is made of wood or soft material, and it can mesh with the workpiece freely to reduce the roughness of the tooth working surface.

b. If the accuracy of the tooth profile cannot be improved, the error of the tooth profile will increase.

The above descriptions of the different types of small module gear processing methods and accuracy characteristics include but are not limited to, welcome to add if there are any deficiencies.