The reverse of the precision of the hobbing machine
The reverse of the accuracy of the hobbing machine's gear transmission chain (Huangshi College, Hubei Huangshi 435 (1) 3) is the goal of summer water quality or accuracy range. The target precision of the hobbing gear and the gearing of the hobbing machine and the transmission accuracy of each transmission pair are established and can be carried out. Reverse and accuracy check.
The effect of eccentricity on the radius of the me base circle Under normal operating conditions, the accuracy of the hobbing process depends on the accuracy of the hobbing machine. In the design process of the hobbing machine, the precision design is based on the target accuracy or accuracy range of the hobbing gear. For the designer, it is necessary to inversely determine the transmission accuracy of the vane chain according to the target accuracy of the determined hobbing gear. At the time of verification, it is also determined whether the transmission accuracy formed by the modified hobbing machine is in accordance with the target accuracy.
Therefore, it is necessary to establish a through relationship between the target accuracy of the hobbing gear and the transmission accuracy of the hobbing machine and the drive pair of the fan chain, and provide a criterion for the accuracy check of the modified hobbing machine.
1 The relationship between the change of the common normal length of the hobbing gear and the eccentricity of the hobbing machine In the chain of the gear hobbing machine, the error of each transmission component includes the radial and axial runout of the transmission member, the tooth profile error of the gear and the worm wheel, the weekly error and the circumference. The cumulative error of the section and the half-angle error of lead screw, nut and worm, lead error and lead accumulation error will affect the transmission precision of the transmission chain, and will be reflected as the relative rotation angle error between the hob spindle and the table. This error causes the cyclical angular velocity of the hob spindle and the machine table to change periodically, and the relative position of the meshing node of the tooth blank and the hob moves continuously, resulting in the actual base circle radius of the hobbing gear constantly changing, and the range of change is as Show.
((1)+A(1)) The maximum value of the relative angular velocity of the hob spindle and the table. When the relative angular velocity of the hob spindle and the table is the smallest (Aw), the meshing node rises and the radius of the base circle of the hobbing gear becomes larger. The maximum value is equivalent to the gear base circle offsetting the center of rotation at the time of machining. The equivalent eccentricity value is the actual base circle radius of the gear. When the rbmin changes, the common normal length of the hobbing gear is also Wmm and Wmax. Change between. The calculation of the length of the common normal line of the involute spur gear 2 and the A9s should satisfy the error A, A and A - respectively, the rotational angular velocity error of the hob spindle and the table respectively will be distributed between the first and the second.
According to the number of the constituent rings in the A-knife and the A-station, the size of the influence of the formation accuracy of the fan-forming chain and the difficulty level of the manufacture of each component, or the average angle of the error is a vector, and the total angular error should be The sum of the vectors of the sub-vectors. In the case where the vector direction is unknown, the root mean square value may be taken.
The total rotation angle error of the hob spindle is the total rotation angle error of the table. Therefore, the error between the hob spindle and the table angular velocity can be determined. The error of the hob spindle and the table angular velocity must satisfy the following conditions as the allowable error of the rotational angular velocity of the table.
Here, the angular velocity allowable error can be determined according to the following formula = After the error is allowed to be distributed by the averaging method, it is necessary to make an adjustment according to the actual situation 1 but the transmission accuracy formed after the adjustment should be checked and the cover description Zhejiang Jiaxue Group bookmark0 Sino-US joint venture Zhejiang Huafeng Micro Motor Co., Ltd. productmark1 series product code main indicators and characteristics YY" gear reduction type, output 0.55 (1) r / min available for selection YY" T gear reduction electronic speed control type, speed range 901400 /minYY"Z gear linear motor, linear speed 1050mm/s stroke 1005WmmDGB electric roller rod Y60 65mm, output power 30W/, length 255900mm, line speed 425mm/min range for SC-A electronic stepless speed controller can be supplied with series motor Output power / 100110200220 Three-phase: 380 code description: YY - Asynchronous motor" One gear reduction T-electronic speed Z-linear motor reducer motor Maximum use torque table Chairman and general manager Chen Ziwen Address: Huzhou City, Zhejiang Province Zhili Economic Open Zone, Zip Code: 13002 Electrical Hanging: 3937 Fax: (0572) 3188140 Shanghai Area General Agent Address: Shanghai Wanping No. 736 South Road Tel: 021 so that Aw Knife and Taiwan do not exceed and respectively. According to this, the following can be used to take the rest of the same method to determine the same.
At this point, we can initially determine the transmission accuracy of each transmission pair according to the common normal deviation of the hobbing gear, and check whether the transmission accuracy of the fan chain meets its target requirements after adjusting the transmission accuracy of each transmission pair.
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