What are the advantages and disadvantages of gear shaping and hobbing? ! !

Advantages and disadvantages of gear shaping and gear hobbing: Compared with gear hobbing, gear shaping has higher accuracy and lower machining efficiency.

The combination is not strong. Cracking, peeling and shedding of putty are mainly caused by the weak bond between putty and grass-roots unit. For example, the base is not cleaned or handled properly, the template isolation agent, oil stain, inorganic acid and organic acid on the base are not completely removed, and the caustic soda aqueous solution is not brushed clean (used to remove oil stains on the wall).

If no binder is used or the content of putty formula emulsion is improper, the bonding strength between putty and base will be reduced. The experimental data show that the bond strength can be improved by 5-9 kg/cm2 after the base is treated, and the bond performance between mortar and base can be improved by adding emulsion, and the bond strength can be improved by 4-7 kg/cm2.

Gear forming movement:

(1) cutting motion The gear shaper cutter reciprocates up and down.

(2) The gear shaper cutter should keep a correct meshing relationship with the workpiece. When the gear shaper cutter moves back and forth once, the arc length of the workpiece rotating relative to the cutter on the indexing circle is the circumferential feed during machining, so the meshing process between the cutter and the workpiece is also the circumferential feed process.

(3) The gear shaper cutter should have radial feed fr to gradually cut to the full tooth depth.

(4) When the cutter moves up and down, the downward direction is the cutting stroke. In order to prevent the cutter from scratching the machined tooth surface and reduce the wear of the cutter teeth, when the gear shaper cutter moves upward, the workbench drives the workpiece to exit the cutting area for a certain distance (radial direction). When the gear shaper cutter works, the workbench will return to its original position.

Refer to the above content: Baidu Encyclopedia-Gear Insertion