# Calculation formula for adjustment method of insta

2022-08-11
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Calculation formula of gear hob installation angle adjustment method

Abstract: This paper mainly introduces a method of hob installation angle adjustment and calculation formula when machining helical cylindrical gears on hobbing machine. With the help of this formula, it is convenient to calculate the size of hob installation angle and determine the deflection direction, so as to quickly install the hob

key words: hob; Installation angle; method; Pithy formula

when machining helical cylindrical gears on Y3150E gear hobbing machine, in order to cut out the accurate tooth shape, the hob and the workpiece should be in the correct "meshing" position, that is, to ensure that the arrangement direction of hob teeth is consistent with the direction of gear slots, so as to process the gear slots with a certain spiral angle. Therefore, before machining the gear, the hob axis must be installed by deflecting a certain angle relative to the top surface of the gear. This deflection angle is called the hob installation angle, which is used to δ express. Hob mounting angle δ The size and direction are not only related to the spiral angle of the hob ω The size and direction are related to the helix angle of the machined gear β The size of the hob is related to the direction, which brings inconvenience to the actual adjustment and installation of the hob. I summarized the "eight character formula" to help the adjustment and installation of hobs

the deflection of hob axis when hobbing helical cylindrical gears, and its installation angle is: δ＝β ± ω ( β＞ω)

installation angle of hob when hobbing helical cylindrical gear

spiral rise angle of hob ω In 2013, 355600 batches of waste raw materials, 55.1426 million tons and 33.703 billion U.S. dollars were imported through the inspection and Quarantine of entry-exit inspection and quarantine institutions β When the rotation direction of is the same, the hob installation angle δ The size of is β-ω； When the spiral angle of the hob ω Rotation direction and gear helix angle of β When the rotation direction of the hob is different, the installation angle of the hob δ The size of is β＋ω。 Hob mounting angle δ The deflection direction of is related to the rotation direction of the processed gear, and the flatness of the screw is mostly within 0.01mm. When processing right-hand gears, the hob deflects counterclockwise; When machining left-hand gears, the hob deflects clockwise. Based on the above analysis, the following formula can be summed up: "the same minus different plus, right inverse left Shun."

same minus different plus: refers to the spiral rising angle of the hob ω The direction of rotation and the helix angle of the gear β When the rotation direction of the hob is the same, the calculation formula of the hob installation angle takes "-"; When the spiral angle of the hob ω The direction of rotation and the helix angle of the gear β When the rotation direction of the hob is different, the calculation formula of the hob installation angle is "+"

right anti left clockwise: refers to the installation angle of the hob that deflects counterclockwise when processing right-hand gears δ； When machining left-hand gears, the hob deflects the installation angle clockwise δ。

for example: use ω＝ 2 ° left-hand hob machining β＝ 20 ° left-hand gear high and low temperature electronic universal testing machine In the high temperature experiment, the comparison formula is determined by "same subtraction" and "left Shun". That is, the installation angle of the hob is δ＝β-ω＝ 20 ° -2 ° = 18 °, the direction is clockwise deflection

another example: use ω＝ 2 ° left-hand hob machining β＝ For 20 ° right-hand gear, use "different addition" and "right inverse" to calculate and deflect according to the formula. That is, the installation angle of the hob is δ＝β＋ω＝ 20 ° + 2 ° = 22 °, the direction is counterclockwise deflection

when machining spur gears, because β＝ 0 °, then the hob installation angle δ Is:

δ＝ ± ω

its deflection direction depends on the spiral rise angle of the hob ω Rotation direction of, i.e. counterclockwise deflection when turning left ω， Clockwise deflection during right rotation ω， There is no need to use the above formula at this time

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