Reconstructing hobbing machine to realize straight bevel gear hobbing
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Therefore, the machine bookmark0 sells straight lacquer lacquer processing bookmark1 Ding Jingmin (2) overflow valve 5 card dead in the open position or low pressure regulation, adjustment, cleaning, more author Tonglian: Zhuzhou Electric Locomotive Factory Motor Branch Equipment Department Hunan Zhuzhou City changed the valve; when the Tianxin equipment was repaired, the straight bevel gear was often replaced, but the bevel gear was machined on a special machine gear machine. However, the general manufacturer does not have this equipment, and usually uses the forming method on the milling machine. The precision and surface roughness are difficult to meet the requirements; sometimes the forming modulus milling cutter that is milled by the forming method is not complete, so that the processing of the bevel gear cannot be performed at all. .
To this end, combined with equipment overhaul, the technical transformation of the ordinary old Y38-1 gear hobbing machine using numerical control technology, under the premise of not affecting the original performance, can realize the hobbing processing of straight bevel gears, and solve the bevel gears in equipment maintenance. Processing problems.
First, the hobbing machine hobbing bevel gear principle is the rotation speed of the gear hob, which is the vertical feed speed of the gear hob, which is the rotation speed of the workpiece, 〃::: is the radial feed speed of the workpiece.
1. Radial feed stepper motor 2. Gearbox 3. Workbench 4. Workpiece 5. Hob 6. Hob slide 7. Vertical feed stepper motor When rolling cylindrical spur gear, hob, The rotary motion of the workpiece, the vertical feed motion of the tool holder, and the radial feed motion of the table, the radial feed motion is manual on the ordinary gear hobbing machine (such as Y38-1, Y3150E, etc.). The rotation of the hob and the rotation of the workpiece must conform to the developmental motion relationship, that is: the number of k-rolling heads is 8. The ejection cylinder has no ejector or the ejection force is insufficient. 3DT does not operate or the reversing valve 4 is stuck, the maintenance circuit, The section line of the electromagnet and the z-piece tooth-cone spur gear is a diagonal line. This slant line can pass the vertical feed motion (y coordinate) of the hob and the horizontal movement U coordinate of the workpiece (workbench) during the hobbing process. The combination is formed to achieve the pitch angle requirement of the workpiece, which is the principle of rolling the straight bevel gear on the hobbing machine.
From the principle of rolling bevel gear, the vertical feed motion of the hob and the radial feed motion of the workpiece must conform to a certain transmission relationship. However, the radial feed of the Y38-1 hobbing machine table is adjusted by turning the screw by hand, and linkage with the vertical tool cannot be realized. Therefore, in order to machine the bevel gear, numerical control technology can be applied to realize the linkage between the vertical feed motion of the tool and the radial feed motion of the workpiece, making it a two-coordinate simple CNC gear hobbing machine.
Second, the CNC hardware part of the CNC system of the gear hobbing machine, considering the strong anti-interference ability of the MCS-51 single-chip microcomputer, the performance price ratio is high, and the 8031 ​​CPU of the series is selected as the central processing machine of the numerical control system. Two pieces of 2732EPROM are connected externally, one is used as the memory of the monitoring program, one is the processing program for storing the workpiece, and then a piece of 6264RAM is selected as the intermediate data for storing the debugging program and running the program.
Considering the system expansion, in order to unify the programming address, the decoder is used to address the extended chip. This function is selected using a 74U138 decoder. In addition, 8155 and 8255 are selected as the input and output extensions of the system respectively, and the input of the keyboard (system control panel) and the output of the single chip microcomputer are respectively accepted. The hardware block diagram is as shown in the figure. It also damages the cylinder seal ring and replaces the seal ring. The ejector cylinder itself is mechanically stuck and overhauled.
The hot-rolled rolling work rolls are made up of bookmark2 â–¡ Zhi Zhiyun Zhao Ling leaf rolling mill, 9 different types of vertical rolls, work rolls and support rolls. Rolls account for a considerable proportion of production costs. In order to ensure the normal working layer thickness of the production, the service life can be increased by 25%, and the accumulated unit consumption is reduced for four consecutive years, achieving the purpose of reducing costs.
The whole software adopts modular design. The software system includes main module, subroutine module, cross-border alarm emergency stop processing module, timed maintenance display buffer data module, keyboard and display timing scan management module.
The basic motion of the slewing straight bevel gear is the same as that of the slewing cylindrical spur gear, but in order to keep the vertical feed (y direction) and the radial feed (direction) interlocked, in the numerical control transformation, the opposite direction and the y direction are adopted. The motor drives the ball (or sliding) screw drive and the mechanical part is modified accordingly.
Disengage the vertical pass system of the Y38-1 hob from the main motor drive chain, so that the gear with the number of teeth on the XXI axis is in the neutral position (the clutch is disengaged), and the 110BF003 stepper motor is directly connected to the coupling. The XXI axis is driven, and the vertical feed is carried out by the original 5/30 worm gear pair and the 10mm sliding screw nut pair to drive the tool holder (the manual feed can be adjusted at the same time).
In order to ensure the vertical feed accuracy, the original screw nut pair and the worm gear pair are refined and replaced to eliminate the gap.
Workpiece (workbench) radial feed (direction) For the radial feed system, remove the original radial feed manual mechanism and the sliding screw, and use the 110BF003 stepper motor (step angle lstep) to drive through the first gear pair The ball screw nut pair (pitch L = 10mm) drives the table to achieve radial feed. The ball screw nut pair adopts a double nut thread clearance method to eliminate the reverse idle motion and the thread clearance to improve the positioning accuracy.
The first-stage gear pair transmission adopts a double-plate thin gear misalignment adjustment method to eliminate the gear transmission gap and improve the driving precision. The ball screw support method adopts a single row tapered roller support structure that increases the support rigidity. In addition, the radial feed system retains the feed adjustment pulse frequency of the manual adjustment feed function/the relationship with the machining cone angle A of the bevel gear. The amount of cutting of the hobbing machine is the vertical feed amount per revolution of the workpiece and the radial feed amount S ( Based on mm/r), the vertical feed (y-direction) and radial (a:-direction) feed rate SM (mm/min) of the microcomputer are obtained by the feed pulse frequency/.
In order to realize the vertical feed system and the radial feed system as required, the cone angle V (the angle between the bevel gear section cone and the large end face, which is not the taper angle A of the bevel gear) satisfies: where Af is vertical Number of worm heads, number of worm gears, screw pitch and number of stepper motor pulses in the feed system.
According to the taper angle of the bevel gear machining; T, in the case of selection (mm/step), in order to ensure that tgA' must be realized by the software of /y and /; in order to process the bevel gear that meets the requirements.
In theory, straight bevel gears can be machined for any gear ratio, but are limited by the structure of the hobbing machine. This modified machine tool only improves the performance of the original machine tool and expands the application surface. In the case where the machine's own motion limit allows, even if the pitch angle is large, there is no difficulty in programming by programming. After the transformation, we processed a bevel gear of the T16 horizontal boring machine: modulus 2, number of teeth 25, pressure angle 20., material 40Cr, pitch angle 26°34'. Machining with a modulus of 2, measured, The accuracy reaches 7 and it runs smoothly after installation.
-1 hobbing machine for numerical control technology transformation, which makes the original machine tool use range expand, improve the technical performance of the machine tool, and the effect is remarkable, which is a good way to transform the old hobbing machine. W01.08-14 set BB and Xiong H2001
