64． How to choose the bond surface roughness parameter value Ra?
Answer: The bonding form is a key, and when moving along the hub groove, Ra is 0.2-0.5μm.
The bonding form is a key, and the Ra is 0.2-0.4μm when moving along the axis groove.
The bonding form is a bond, and the fixed position, Ra is 1.6μm.
The combination form is a shaft groove. Where it moves along the hub groove, Ra is 1.6μm.
The combination form is an axis groove, and when moving along the axis groove, Ra is 0.4-0.8μm.
The combination form is a shaft groove, and the fixed position, Ra is 1.6μm.
The combination form is a hub groove, and when moving along the hub groove, Ra is 0.4-0.8μm.
The combination form is a hub groove. Where it moves along the shaft groove, Ra is 1.0μm.
The combination form is hub groove, and the fixed position, Ra is 1.6-3.2μm.
Note: The non-working surface Ra is 6.3μm.
65． How to choose the surface roughness parameter value Ra of rectangular spline?
Answer: Internal spline, at the outer diameter, Ra is 6.3μm.
Internal spline, inner diameter, Ra is 0.8μm.
Internal spline, key side, Ra is 3.2μm.
External spline, at the outer diameter, Ra is 3.2μm.
External spline, inner diameter, Ra is 0.8μm.
External spline, key side, Ra is 0.8μm.
66． How to choose the gear surface roughness parameter value Ra?
Answer: When the part is the tooth surface and the accuracy level is level 5, Ra is 0.2-0.4μm.
When the tooth surface accuracy level is level 6, Ra is 0.4μm.
When the tooth surface accuracy level is level 7, Ra is 0.4-0.8μm.
When the tooth surface accuracy level is 8, Ra is 1.6μm.
When the tooth surface accuracy level is level 9, Ra is 3.2μm.
When the tooth surface accuracy level is level 10, Ra is 6.3μm.
When the part is an outer circle and the accuracy level is level 5, Ra is 0.8-1.6μm.
When the part is an outer circle and the accuracy level is level 6, Ra is 1.6-3.2μm.
When the part is an outer circle and the accuracy level is level 7, Ra is 1.6-3.2μm.
When the part is an outer circle and the accuracy level is level 8, Ra is 1.6-3.2μm.
When the part is an outer circle and the accuracy level is level 9, Ra is 3.2-6.3μm.
When the part is an outer circle and the accuracy level is level 10, Ra is 3.2-6.3μm.
When the end face accuracy level is level 5, Ra is 0.4-0.8μm.
When the end face accuracy level is level 6, Ra is 0.4-0.8μm.
When the end face accuracy level is level 7, Ra is 0.8-3.2μm.
When the end face accuracy level is level 8, Ra is 0.8-3.2μm.
When the end face accuracy level is level 9, Ra is 3.2-6.3μm.
When the end face accuracy level is level 10, Ra is 3.2-6.3μm.
- How to choose the surface roughness parameter value Ra of worm gear?
Answer: When the worm part is the tooth surface and the accuracy level is level 5, Ra is 0.2μm.
When the worm part is a tooth surface with an accuracy level of 6, Ra is 0.4 μm.
When the worm part is a tooth surface with an accuracy level of 7, Ra is 0.4 μm.
When the worm part is a tooth surface with an accuracy level of 8, Ra is 0.8 μm.
When the worm part is a tooth surface with an accuracy level of 9, Ra is 1.6 μm.
When the worm part is the tooth tip and the accuracy level is level 5, Ra is 0.2μm.
When the worm part is the tooth tip and the accuracy level is level 6, Ra is 0.4μm.
When the worm part is the tooth tip and the accuracy level is level 7, Ra is 0.4μm.
When the worm part is the tooth tip and the accuracy level is level 8, Ra is 0.8μm.
When the worm part is the tooth tip and the accuracy level is level 9, Ra is 1.6 μm.
Note: The worm part is the tooth root, and Ra is 6.3μm.
When the worm gear part is a tooth surface with an accuracy level of 5, Ra is 0.4 μm.
When the tooth surface accuracy level of the worm gear is level 6, Ra is 0.4μm.
When the worm gear part is a tooth surface with an accuracy level of 7, Ra is 0.8 μm.
When the worm gear part is a tooth surface with an accuracy level of 8, Ra is 1.6 μm.
When the worm gear part is a tooth surface with an accuracy level of 9, Ra is 3.2 μm.
Note: The worm gear part is the tooth root, and Ra is 3.2μm.
- How to choose the sprocket surface roughness parameter value Ra?
Answer: When the working surface precision of the sprocket teeth is average, Ra is 1.6-3.2μm.
When the working surface of the sprocket teeth has high precision, Ra is 0.8-1.6μm.
When the tooth base is of average accuracy, Ra is 3.2μm.
When the location is the tooth base with high accuracy, Ra is 1.6μm.
When the tooth top accuracy is average, Ra is 1.6-3.2μm.
When the part is a tooth tip with high precision, Ra is 1.6-6.3μm.
- How to choose the pulley surface roughness parameter value Ra?
Answer: When the part is the working surface of the pulley and the pulley diameter is ≤ 120mm, Ra is 0.8μm.
The location is the working surface of the pulley. When the pulley diameter is ≤ 300mm, Ra is 1.6μm.
When the pulley diameter is greater than 300mm on the working surface of the pulley, Ra is 3.2μm.
- How to choose the surface roughness parameter value Ra of hydraulic components?
Answer: The location is the piston pump crank, the piston, Ra is 1.6-0.8μm.
The parts are connecting rod journal, bearing bush, and center journal. Ra is 0.4μm.
The location is the outer cylindrical surface of the piston. At the side surface, Ra is 0.8μm.
The parts are the connecting rod hole of the piston pump, the cylinder barrel, the slide valve bushing, the plunger, and the piston. Ra is 0.8-0.4μm.
The parts are slide valve, high-pressure pump plunger valve, and valve seat, Ra is 0.2-0.1μm.
- How to choose the surface roughness parameter value Ra of the mating surface of the sliding bearing?
Answer: The location is shaft tolerance level IT7-IT9, Ra is 0.2-3.2μm.
The location is the shaft tolerance level IT11-IT12, Ra is 1.6-3.2μm.
The location is hole tolerance level IT7-IT9, Ra is 0.4-1.6μm.
The location is hole tolerance level IT11-IT12, Ra is 1.6-3.2μm.
- How to choose the conical combined surface roughness parameter value Ra?
Answer: The location is the sealing joint of the outer cone surface, Ra is ≤0.1μm.
The location is the centering joint of the outer cone surface, Ra is ≤0.2μm.
The location is other joints on the outer cone surface, Ra is ≤1.6-3.2μm.
The location is the sealing joint of the inner cone surface, Ra is ≤0.2μm.
The location is the centering joint of the inner cone surface, Ra is ≤0.8μm.
The location is other joints on the inner cone surface, Ra is ≤1.6-3.2μm.
