Gear transmission is widely used, the requirements for gear manufacturing quality are getting higher and higher, and the demand is increasing. The drum gear can improve the meshing condition of the gear, make the tooth load distribution even, improve the bending strength of the gear, and reduce the transmission noise. ,Extended service life. Compared with the straight-toothed coupling, the crown-shaped gear coupling has the advantages of high bearing capacity, long service life, low maintenance cost and high mechanical efficiency, and is widely used in cranes and the like. The ordinary gear hobbing machine does not have the function of processing the drum gear. Some hobbing machines can realize the drum gear processing function by adding the contour plate and manually shaking the machine tool column. However, this method has poor column feeding sensitivity and high workpiece tooth surface roughness. The drawbacks of the profile plate and the laborious operation are particularly complicated. The adjustment of the machine tool is complicated, the adjustment period is long, the product adaptability is poor, and the processing quality is low, which seriously restricts the production of the drum gear.

This topic comes from the actual demand of the production of drum gears by the production enterprises. According to the recent development of numerical control technology, especially the open motion controller, the CNC technology transformation of the Y3150E gear hobbing machine of a certain factory should be carried out at the request of a factory. Successfully developed a CNC hobbing system based on the HUSTCNC-H3X open motion controller and used it for actual production. The modified CNC gear hobbing machine has simple adjustment and stable and reliable mechanical performance, which greatly improves the processing quality and processing precision of the drum gear and greatly improves the production efficiency.

1 hobbing machine processing principle 1.1 hobbing machine transmission chain analysis hobbing machine should have the following transmission chain: main motion transmission chain, exhibition motion transmission chain, vertical feed motion transmission chain, axial motion transmission chain, radial feed motion transmission chain. The working motion of the hobbing machine is: (1) Main motion: The main motion is the rotary motion of the hob.

(2) Exhibition movement: the rotation of the hob and the workpiece, the servo motor drives the rotation of the hob and the workpiece respectively, and the servo motor moves according to the control command, strictly ensuring that the hob and the workpiece are synchronized. The program has large investment, high cost, high requirements for real-time control of motion controllers, and difficult control software programming.

(3) Vertical feed motion: The vertical feed motion is a continuous feed motion of the hob along the axial direction of the workpiece to cut the tooth shape over the entire tooth width. The axial feed is modified to be driven by the servo motor M1. The speed of the M1 can be adjusted to obtain the required feed rate. The modification principle is as shown.

(4) Radial feed: the workpiece is fed radially to the direction of the hob, and the vertical feed motion and the radial feed are combined to machine the drum gear. The horizontal radial feed is modified to be driven by the servo motor M2, and the hob is moved tangentially by the worm pair and the screw pair, and the required tangential feed speed can be obtained by adjusting the servo motor speed.

Due to the requirements of the factory and subject to cost constraints, the exhibition movement retained the original gear shifting chain of the ordinary gear hobbing machine, and two servo motors were used for CNC transformation.

1.2 Overall design scheme According to the forming principle of the drum gear, comprehensive consideration is given to the following requirements of the follow-up and rapidity of the mechanical feed system in the hobbing and the cost of the transformation. On the basis of retaining the original gear gear of the ordinary gear hobbing machine, according to the numerical control theory In the principle of circular interpolation of two coordinate axes, the vertical feed motion of the tool holder and the horizontal radial feed are numerically controlled and modified to realize the drum gear processing. According to the calculation of workpiece precision and cutting force, referring to the drag mode of CNC hobbing machine at home and abroad, the semi-closed loop servo system driven by servo motor is adopted.

Machining the drum gear on the CNC gear hobbing machine, according to its workpiece drawing parameters, fixture size, hob parameters, process requirements, determine the position of each axis, XY two coordinates linkage, using circular interpolation method, the processing is symmetrical to the workpiece tooth width, belt Circular drum spur and helical gears. Numerical calculation and adjustment principle.

2 In the case of mechanical part transformation, in order to reduce the cost, the numerical control shaft number is reduced as appropriate, and the original mechanical gear hobbing machine is less modified. The drum gears of different sizes can be processed by parameterized setting, and the operation is simple and convenient.

The feed X-axis and Y-axis are respectively controlled by the servo motor through the numerical control system. The feed system of the CNC machine tool should meet the basic requirements of no gap, low friction and high rigidity. The mechanical transformation that needs to be completed mainly includes the sliding screw to have The ball screw with pre-tightening and anti-backlash function, the worm-worm gear pair is changed to double-lead involute worm pair. Increase the axial adjustment link, the sliding bearing () is changed to the rolling bearing, remove the vertical feed drive chain and adjust the hanging wheel mechanism. The numerical control of the XY axis of the tool holder makes the movement precision of the machine tool greatly improved, the machine tool is more flexible, the adjustment is more convenient, and the labor intensity of the worker is greatly reduced.

3 control software design scheme 3.1 control system scheme development This scheme is an open CNC system using Taiwan multi-axis motion controller HUSTCNC-H3X. The core is an open multi-axis motion control card with PC104 bus and its own high-speed DSP chip. It forms a multi-processor structure with the embedded PC host. The card has its own DSP chip for real-time high-speed interpolation and calculation functions. Space straight line and circular interpolation greatly reduce the burden on the host. It also provides a program buffer. The motion control card communicates with the computer through the PC104 bus. On the one hand, the data collected from each control axis is sent to the host for calculation. On the one hand, the motion control commands generated by the host computer based on the process and the mathematical model are further processed and sent to the servo drives of the respective axes to complete the motion control of each axis, and the qualified parts satisfying the process requirements are processed.

3.2 Control software design method The system control software is developed in C language under pure DOS. The openness, single task, accurate clock interrupt management and good stability of DOS system provide reliable guarantee for industrial production. The entire software system adopts modular design, which includes three parts: main program module, subprogram module and processing program module. See Figure 3 for the LCD panel and buttons of the controller. See Figure 4 for the single-segment operation interface. The system initialization includes the loading of the self-made small Chinese character font, the initialization of the display graphic mode, and the setting of the filter parameters of the controller. The function of the system diagnostic module is to monitor the motion state of each controlled axis, such as: whether there is any motion error overrun in each axis, servo alarm, motion completion, limit switch action, etc. The real-time control module is implemented by the interrupt service program. It reads each axis position in each clock interrupt period, and calculates a new motion control command to be interpreted and executed according to the processing requirements of the processing object.

4 hardware circuit The transformation plan discussed in this paper uses open motion control card to drive each axis motor, get rid of the restrictions of foreign imports, give full play to the advantages of software and hardware on the PC platform, enrich and improve the development environment. The hardware circuit consists of peripherals, signal conversion circuits and auxiliary circuits to form a complete simple CNC system, which completes a series of functions such as input and processing, display and motor drive.

The hardware control part of the gear hobbing system and some electrical schematics are shown.

5 Conclusion This design has been successfully applied to the transformation of medium hobbing machines. The invention solves the problem of hobbing processing of the drum gear better, and the processed tooth surface of the drum gear has high quality. For different drum gear products, according to the parts drawing parameters and the hob parameter engineering requirements, determine the position of each axis, and simply input the corresponding G54 workpiece coordinate system and other parameters, and flexibly and quickly adapt to the changes of the machined parts. , processing a variety of drum gear. Therefore, the design has the characteristics of strong product adaptability, good processing quality and high production efficiency, and has the advantages of low transformation cost, short modification period, convenient operation and the like.

(1) The numerical control transformation of the gear hobbing machine greatly improves the gear processing capability and processing efficiency and improves the operation performance.

(2) Effectively improve the machining accuracy and efficiency of the workpiece after the NC transformation. The machine tool is easy to operate, the processing efficiency is high, the processing quality is stable, and the effect is good.

(3) The machine tool can be programmed according to the characteristics of the machined parts, and various forms of block cycle machining programs can be performed, and the NC machining of the drum gear can be realized by programming.

(4) The related technical transformation can be promoted on gear machine tools, which has broad technical prospects and significant economic benefits.

(5) If the machining capacity of the gear hobbing machine needs to be further improved, a separate servo motor control can be applied to the other feed shafts and the angle A axis of the hob cutter head to carry out a comprehensive numerical control transformation. It is technically not difficult but costly, and users have to make trade-offs based on demand and cost.

(Finish)

CDEA

Cocamide DEA, or cocamide diethanolamine, is a diethanolamide made by reacting the mixture of fatty acids from coconut oils with diethanolamine.
Characteristics:
1.Excellent decontamination, wetting, dispersion, anti-hard water, and antistatic performances.
2.Perfect thickening, foaming, foam-stabilizing and derusting abilities.
3.Compounded with other anionic surfactants, such as LABSA, the foaming ability will be obviously improved, and foam is more affluent, stable, and long-standing. The washing effect is also enhanced.
Application:
1.Added in shampoo and hand washing, it can not only stabilize foam and thicken the liquid,
but also will reduce the irritation to the skin.
2.For it can soften fiber textile, it is especially suitable for washing animal fiber, such as hair and thread, etc.
3.Its applications are in liquid Detergent, shampoo, dishware detergent, liquid soap, fiber
modifier, wool cleanser and metal rinse, etc.
4.Also used in electric plating, shoe polish and printing ink, etc.

CDEA,Coconut Diethanolamide CDEA,CDEA For Washing Hand,Cocamide DEA 6501

Yucheng Jinhe Industrial Co.,Ltd , https://www.hntitaniumdioxide.com