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刖m Pangang Group Chengdu Seamless Steel Tube Co., Ltd. The fifth line of the milk tube factory in the finishing area of ​​the online equipment pipe saw is introduced from the US CMI company. The saw is mainly used for cutting, cutting, intermediate cutting, fixed length and indeterminate cutting of steel pipes. The headstock is the core part of the tube saw. In order to ensure its normal operation, it is planned to make spare parts for localization. The saw blade is mounted on the main shaft of the saw headstock, and is driven by a pair of pulleys and a multi-stage gear pair in the casing.
The lifting of the saw blade is controlled by the lifting screw at the end of the spindle head.
1 Main parameters of the headstock and gear transmission characteristics The main parameters of the headstock are as follows: the main motor is a DC variable speed motor, the power is 90kW, 159, the gear pair has 4 levels, the reduction ratio is 22.123, and the total reduction ratio is 69.888; Deng Xiao ( 1966-), male, Jiangxi, senior engineer, has long been engaged in the design of seamless steel pipe equipment.
The maximum width of the pipe is 820mm, and the diameter of the pan 1 is interrupted due to the sawing operation, and vibration is generated when the saw is inserted. In addition, the vibration of the transmission system makes the saw blade extremely vulnerable. This requires the minimum vibration of the headstock during operation and the smaller the flank clearance of the transmission gear pair. In theory, it is better to achieve the so-called "backlash-free transmission". In this regard, in the localized design of the spindle headstock, thickened gears are used for all gears in order to achieve a "backlash-free transmission" approximately.
2 Introduction to thickening gears The full name of thickening gears is variable-tooth thick involute gears. Its geometrical feature is that the tooth profile has different displacement coefficients on different end sections of a gear. When machining with a rack tool, the indexing plane of the rack intersects the axis of the gear to be cut into an S angle, which is the tooth inclination of the thickened gear. The other relative motion of the rack tool and the gear is the same as for a normal cylindrical gear. At the intersection of the tool indexing plane and the processing section plane, the indexing line of the rack tool is tangent to the indexing circle 32 of the gear, so the tooth profile at the end section of the indexing circle is standard (zero variation) The tooth profile of the gear, which is called the intermediate section.
The displacement coefficient on the side of the middle section of the thickened gear is positive, and its value is gradually increased from zero, which is called the big end; the other side is a negative displacement coefficient, and its value is gradually reduced from zero, which is called For the little end. The displacement coefficient of the thickened gear is linearly changed in the tooth width direction, and the addendum circle and the root circle are conical, and the pitch circle and the pitch circle at the time of meshing are still cylindrical. Due to the simultaneous presence of the S angle and the /8 angle, the tooth profiles on both sides of the tooth on the end section of the gear are asymmetrical. From the big end of the gear, the left flank is indicated by the angle L, and the right flank is indicated by the angle R. See 2. When installing a thickened gear, the big end and the small end of the large gear are required to be small with the small gear. The end and the big end are engaged to form two cones which are similarly complementary, so the transmission has the following characteristics: the backlash of the gear pair is adjusted by changing the axial relative positions of the two gears, and the backlash-free transmission is approximately achieved. When assembling, adjust the flank clearance to a small value, adjust the tooth gap again after a period of idle operation, and adjust it repeatedly.
(3) The tooth profile height coefficient A of the rack end face, (4) the radial clearance coefficient of the rack end face Ct normal radial clearance coefficient.
3 The calculation formula of the relevant parameters According to w, the relevant parameters of the rack tool for thickening gear can be calculated according to the following formula.
(1) Rack cutter tooth profile angle a, (L, K) 8-index plane tooth line inclination angle.
(6) The gear end displacement coefficient is positive and the small end is negative).
Deng Xiaopo: The design of the thickened gear of the headstock of the pipe saw is simplified. In this paper, the tooth profile of the geometric intermediate section of a pair of meshing gears is considered to be zero displacement. Thus, the relationship between the two tooth profiles of any one of the pair of meshing gears in the axial direction is highly displaced, that is, the absolute values ​​of the two tooth profiles are equal and opposite.
Gear indexing scalar thickness S tooth tip circle radius r. Root circle radius n indexing The pitch P is the relationship between dS and the axial adjustment amount (ie, the distance from the intermediate section). The same applies to the big end of the pinion. Similarly, the relationship between the tooth inclination angle of the large gear and the amount of change in the tooth thickness and the amount of axial adjustment can also be expressed by the above formula, that is, the flank clearance y required by a pair of gear pairs or If the normal or tangential clearance) and the axial adjustment amount have been determined, the tooth inclination angle s required for the thickening gear of the machining table spiral angle can be obtained. Specifically, the main shaft gear box of the tube saw, the gear pair of each stage The parameters of axial adjustment, center distance, number of teeth, modulus, helix angle, tooth width and other parameters are as close as possible to the original imported headstock, and the tooth thickness of each section of the gear is checked by the indexing circular chord tooth thickness, mainly big end and small. End and middle section.
4 Introduction to the calculation program of the geometric parameters of thickened gears The main headbox has 4 gear pairs with 8 gears. The geometric parameters, inspection dimensions and tolerances of the 24 sections of the big end, small end and intermediate section are calculated. The calculation of the displacement helical gear is very complicated. The author uses the QBa-sic language to compile the calculation program of the geometric parameters of the thickened gear. See the block diagram. Computer calculation is simple and fast, and the calculation results are consistent with the results of manual sampling calculation, which proves the correctness of the program.
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