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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>What are the methods for improving the shaft gear hobbing? What are the methods for progressive shaft gear hobbing?
The shaft gear is the most important part in the gearbox; the unevenness of the machining accuracy directly affects the overall quality of the gearbox. At present, the gear tooth processing method we choose is the hobbing and shaving method. It must be made by rolling and shaving. High-precision gears; it is necessary to make the level of rolling and shaving to the best. The accuracy of shaving is largely dependent on the accuracy of saddle hobbing; therefore, some errors in hobbing must be strictly controlled; High-quality gears. Hobbing is a common method of gear processing; on high-precision hobbing machines; fine hobs are used; can produce 45-level precision gears. On normal-stage hobbing machines; with normal precision hobs; Only 8 precision gear teeth can be machined. The accuracy of the gear shaft gear tooth is 877; and the hobbing process is based on the two intermediate holes and the end face; therefore, the error of the hobbing is analyzed. And the way to improve machining accuracy is very important. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The accuracy of hobbing machining is mainly related to the motion accuracy, stationarity accuracy and touch precision. The hobbing machining top controls the common normal length and the ring gear diameter to ensure the motion accuracy; it uses the control tooth shape error and the base error. To ensure the accuracy of the operation; to correct the touch accuracy by manipulating the tooth orientation error. The following several types of error causes that are easy to be presented in the hobbing process are analyzed:
Ring gear radial runout error (ie a few bites of pain)
The ring gear radial runout refers to the gear rotation range; the probe is in the tooth groove or on the gear teeth; the double-sided touch with the tooth height middle; the maximum change of the probe relative to the tooth axis. It is also the gear ring gear. The pain relative to the middle line of the shaft; this kind of pain is caused by the parts of the device; the two intermediate holes of the part do not coincide with the reverse intermediate device of the workbench or the error is too large, or the top and top holes are poorly made. The positioning surface is not well touched to form a partial pain; therefore, the ring diameter jump should be analyzed from the above edge.
Common normal length error (ie, painful movement)
Hobbing is the processing of gears by the principle of development; the gear transmission chain from the tool to the tooth blank is connected with the accuracy of the movement according to the certain transmission ratio. However, these transmission chains are composed of a series of transmission components.
Their fabrication and device errors must be concentrated on the end parts of the transmission chain during the transmission movement; the relative motion non-uniformity occurs; affecting the machining accuracy of the gear teeth. The change of the common normal length reflects the uneven distribution of gear teeth. The biggest error; this error is mainly caused by the uneven rotation precision of the worm gear table of the hobbing machine; the circular guide rail wear of the hobbing machine workbench, the indexing worm wheel and the circular guide of the worktable are formed by different axes; If the tooth surface is severely bumped or the wheel is too loose or too tight, it will affect the change of the common normal line.
Tooth profile error profile error refers to the normal spacing between the two slanted tooth profiles (involute) profiles that accommodate the actual tooth profile. It is impossible to achieve complete machining during the machining process. Correct involute profile; there are always various errors; then affect the smoothness of the transmission. The base circle of the gear is a specific parameter that determines the involute profile; if the base circle is erroneous during the hobbing process; There must be errors in the shape. The radius of the base circle R=
Hob movement speed / work table reverse angular speed xcosao (ao is the original tooth angle of the hob); in the hobbing process, the involute tooth shape is mainly based on the fixed speed ratio between the hob and the tooth blank. It is obvious; the tooth shape error is mainly the hob tooth shape error resolution; the hob sharpening quality is not good enough to present the tooth shape error. The radial runout and axial turbulence of the hob together in the device (ie Device errors also have an effect on the tooth profile error. Common tooth shape errors are asymmetrical, tooth angle errors (tooth tip change or thickening), cycle errors, etc.
Tooth direction error analysis The tooth orientation error is on the indexing cylindrical surface; in the range of the full tooth width; the two end faces of the tooth-tooth line that represent the actual tooth line are spaced. The primary cause of the tooth-to-path error is the machine tool and the tool holder. The straight feed direction is offset from the part axis; or the middle of the upper tailstock tip is inconsistent with the reverse phase of the workbench; when the helical bevel gear is rolled; the differential hanging wheel calculation error is large; the differential drive chain gear making and adjustment error is too Large. Other fixtures and tooth blanks, devices, and low adjustment accuracy can also cause misalignment.
Tooth surface roughness analysis of the tooth surface roughness is usually good, there are usually several appearances: hairline, caries, fish phosphorus, tear.
The main reasons for the difference in tooth surface roughness are as follows: the lack of rigidity of the machine tool, the tool and the workpiece system, the large gap, the relative orientation of the hob and the workpiece, the improper cutting of the hob, the uneven material of the parts, and the selection of cutting parameters. Not suitable.
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What are the methods for progressive shaft gear hobbing?
Source: China Bearing Network Time: 2013-08-05