Processing methods of gear
There are two types of involute gear processing methods. One is the profiling method, which uses a forming milling cutter to mill out the tooth groove of the gear, which is "imitating the shape". The other is Fan Cheng Fa (Zhan Cheng Fa).
(1) Hobbing machine gear hobbing: can process helical gears with less than 8 modules
(2) Milling machine milling teeth: can process straight racks
(3) Slotting machine gear shaping: internal teeth can be processed
(4) Cold beater gearing: can be processed without chips
(5) Gear shaper: can process large gears with 16 modules
(6) Precision cast gears: cheap pinions can be processed in large quantities
(7) Gear grinding machine: gears on precision mother machines can be processed
(8) Casting teeth of the die-casting machine: most non-ferrous metal gears are processed
(9) Gear shaving machine: a metal cutting machine for gear finishing
Failure form
1. Tooth surface wear
For open gear transmission or closed gear transmission containing dirty lubricating oil, due to the relative sliding between the meshing tooth surfaces, some harder abrasive particles enter the friction surface, which changes the tooth profile and increases the backlash. As a result, excessive thinning of the gear causes tooth breakage. Under normal circumstances, only when the lubricating oil is mixed with abrasive particles, the tooth surface abrasive particles will wear out during operation.
2. Tooth surface gluing
For high-speed and heavy-duty gear transmissions, due to the large friction between the tooth surfaces and the high relative speed, the temperature in the meshing area is too high. Once the lubrication conditions are poor, the oil film between the tooth surfaces will disappear, making the metal of the two teeth The surfaces are in direct contact, so mutual bonding occurs. When the two tooth surfaces continue to move relative to each other, the harder tooth surface tears part of the material on the softer tooth surface along the sliding direction to form grooves.
3. Fatigue pitting
When the two meshing gear teeth contact each other, the force and reaction force between the tooth surfaces cause contact stress on the two working surfaces. Since the position of the meshing point is changed and the gear moves periodically, the contact stress is According to the pulsation cycle. Under the action of this alternating contact stress on the tooth surface for a long time, small cracks will appear at the knife mark of the tooth surface. As time goes by, this crack gradually expands on the surface layer laterally. After the crack forms a ring, the wheel The surface of the tooth produces a small area of spalling and forms some fatigue pits.
4. Broken gear teeth
In operation engineering, a gear that bears a load is like a cantilever. When the periodic stress of the root of the gear exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. It will happen when the remaining part cannot bear the transmission load. Tooth broken phenomenon. Gears may also cause tooth breakage due to severe impact, unbalanced load, and uneven material during work.
5. Plastic deformation of tooth surface
Under impact load or heavy load, the tooth surface is prone to local plastic deformation, which deforms the curved surface of the involute tooth profile.
Lubrication characteristics
The movement of a pair of reducer gears is completed by a pair of tooth surface meshing movement. The relative movement of a pair of smooth tooth surfaces also includes rolling and sliding. For the gear that transmits power, the force and force of the gear should be studied. Deformation. Need to apply the knowledge of mechanics. There is lubricating oil between the two tooth surfaces of the gear, and the knowledge of fluid mechanics is involved. If the surface film formed by the interaction between the lubricant and the gear surface is studied, knowledge of physics and chemistry is required. Therefore, under the condition of lubricant, the existence of lubricant must be considered in order to truly and comprehensively reflect the kinematics and dynamics of gear transmission. The gear design of Jiren Lubricant is a more comprehensive and perfect gear design.
Luoyang Yujie Industry &Trade Co.Ltd located in Luoyang City, one of the main heavy industrial bases in China. We specialize in the production of bearings, nonstandard machinery parts, machine tools. For the bearings, we can offer cross roller bearing, slewing bearing, YRT bearing, thin section bearing, ball screw bearing, deep groove ball bearing, etc. For the nonstandard machine parts, we can produce gears, shafts, sprockets, molds, rollers, pulley, mining machine parts, etc as per customer drawing and requirements. For the machine tools, we offer CNC vertical machine center, CNC horizontal lathe, CNC gantry boring and milling machine, CNC floor type boring, and milling machine.
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Luoyang Yujie Industry & Trade Co., Ltd.
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