Whether the gear shaping process is roughing or finishing
Whether the gear shaping process is roughing or finishing
The tooth gear shaping process belongs to the generation method. It and the tooth grinding process are used for gear finishing. The tooth gear shaping process can improve the tooth shape accuracy and tooth direction accuracy, and reduce the roughness of the tooth surface. It needs to be carried out on a special gear gear shaping machine.
1.Gear gear shaping processing:
1. The axis of the gear shaping cutter and the axis of the workpiece include an angle of β, so that the gear shaping cutter and the workpiece can be properly meshed.
2. During gear shaping processing, the workpiece is driven by the gear shaping cutter to rotate.
3. The speed of the contact point A between the gear shaping cutter and the workpiece can be decomposed into the tangential speed and the gear shaping speed.
4. The tangential speed drives the workpiece to rotate, and the gear shaping speed makes the tooth flank of the gear slide along the tooth flank of the gear shaping cutter, cutting off extremely thin chips from the tooth surface of the workpiece.
5. In the process of gear shaping, the gear shaping knife sometimes rotates forward and sometimes reversely, which can shave both sides of the workpiece.
Second, the characteristics of gear gear shaping:
1. The gear shaping cutter drives the workpiece to rotate, and the two form a free meshing motion of the helical gear without backlash. The productivity of tooth gear shaping processing is high. It generally only takes 2 to 4 minutes to process a medium-sized gear. Compared with grinding, the productivity can be increased by more than 10 times.
2. The tooth gear shaping is a free meshing generating process, and the machine tool has no generating motion transmission chain, so the structure of the machine tool is simple and the adjustment of the machine tool is easy. Different from inserting and hobbing.
3. When the hardness of the gear before gear shaping is in the range of 22-32HRC, the gear shaping cutter has a good ability to correct errors. If the gear material is uneven, contains too much impurities or has too much toughness, it will cause the gear shaping cutter to slip or bite.
4. Tooth gear shaping is a finishing method of tooth shape, so the gears before gear shaping should have higher precision. Usually, the precision after gear shaping can only be one level higher than that before gear shaping.
5. The size of the gear shaping allowance has a great influence on the gear shaping quality and productivity.
6. When gear shaping teeth, in order to reduce the load on the tooth top of the gear shaping cutter and avoid the tip of the cutter from breaking, dig out a piece at the heel of the tooth before gear shaping.
7. It is also very important to reasonably determine the cutting amount and correct operation.
8. The machining accuracy of tooth gear shaping is generally 6 to 7 grades, and the surface roughness Ra is 0.8 to 0.4 μm, which is used for the finishing of unquenched gears.
3. The movement of gear gear shaping:
1. Cutting motion: The relative sliding between the knife and the workpiece, and the relative sliding speed is the cutting speed.
2. Longitudinal feed speed (bidirectional).
3. Radial feed movement: In order to ensure the gap-free meshing between the tool and the workpiece, and to ensure the working pressure between the tooth surfaces, the worktable should be radially fed after each double stroke.
Fourth, the application of gear shaping:
1. gear shaping the teeth cannot correct the tooth separation error. The tooth shape before gear shaping is mostly processed by hobbing.
2. The gear shaping gear is widely used in the finishing of unquenched straight or helical cylindrical gears (below HRc35), the precision can reach 7~6 grades, and the surface roughness Ra value can reach 08~04μm.
3. The design and manufacture of the gear shaping cutter are troublesome and the price is high, so it is suitable for the occasion of mass production.
The tooth gear shaping process belongs to the generation method. It and the tooth grinding process are used for gear finishing. The tooth gear shaping process can improve the tooth shape accuracy and tooth direction accuracy, and reduce the roughness of the tooth surface. It needs to be carried out on a special gear gear shaping machine.
1.Gear gear shaping processing:
1. The axis of the gear shaping cutter and the axis of the workpiece include an angle of β, so that the gear shaping cutter and the workpiece can be properly meshed.
2. During gear shaping processing, the workpiece is driven by the gear shaping cutter to rotate.
3. The speed of the contact point A between the gear shaping cutter and the workpiece can be decomposed into the tangential speed and the gear shaping speed.
4. The tangential speed drives the workpiece to rotate, and the gear shaping speed makes the tooth flank of the gear slide along the tooth flank of the gear shaping cutter, cutting off extremely thin chips from the tooth surface of the workpiece.
5. In the process of gear shaping, the gear shaping knife sometimes rotates forward and sometimes reversely, which can shave both sides of the workpiece.
Second, the characteristics of gear gear shaping:
1. The gear shaping cutter drives the workpiece to rotate, and the two form a free meshing motion of the helical gear without backlash. The productivity of tooth gear shaping processing is high. It generally only takes 2 to 4 minutes to process a medium-sized gear. Compared with grinding, the productivity can be increased by more than 10 times.
2. The tooth gear shaping is a free meshing generating process, and the machine tool has no generating motion transmission chain, so the structure of the machine tool is simple and the adjustment of the machine tool is easy. Different from inserting and hobbing.
3. When the hardness of the gear before gear shaping is in the range of 22-32HRC, the gear shaping cutter has a good ability to correct errors. If the gear material is uneven, contains too much impurities or has too much toughness, it will cause the gear shaping cutter to slip or bite.
4. Tooth gear shaping is a finishing method of tooth shape, so the gears before gear shaping should have higher precision. Usually, the precision after gear shaping can only be one level higher than that before gear shaping.
5. The size of the gear shaping allowance has a great influence on the gear shaping quality and productivity.
6. When gear shaping teeth, in order to reduce the load on the tooth top of the gear shaping cutter and avoid the tip of the cutter from breaking, dig out a piece at the heel of the tooth before gear shaping.
7. It is also very important to reasonably determine the cutting amount and correct operation.
8. The machining accuracy of tooth gear shaping is generally 6 to 7 grades, and the surface roughness Ra is 0.8 to 0.4 μm, which is used for the finishing of unquenched gears.
3. The movement of gear gear shaping:
1. Cutting motion: The relative sliding between the knife and the workpiece, and the relative sliding speed is the cutting speed.
2. Longitudinal feed speed (bidirectional).
3. Radial feed movement: In order to ensure the gap-free meshing between the tool and the workpiece, and to ensure the working pressure between the tooth surfaces, the worktable should be radially fed after each double stroke.
Fourth, the application of gear shaping:
1. gear shaping the teeth cannot correct the tooth separation error. The tooth shape before gear shaping is mostly processed by hobbing.
2. The gear shaping gear is widely used in the finishing of unquenched straight or helical cylindrical gears (below HRc35), the precision can reach 7~6 grades, and the surface roughness Ra value can reach 08~04μm.
3. The design and manufacture of the gear shaping cutter are troublesome and the price is high, so it is suitable for the occasion of mass production.
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