Design and Calculation of 6 Spring High-efficiency Opener Zhang Shian Guo Huizhen Huang Jingyuan 21. Department of Mechanical Engineering, Changde Teachers College, Changde, Hunan 415003, China; 2. School of Mechanical Engineering, Tsinghua University, Beijing 184 Cylindrical spiral compression spring is the basic part of the machinery industry, widely It is used in electric locomotive mining equipment, automobile and motorcycle tractors, etc., and in the production process, some processing methods and equipments still have shortcomings, which seriously affect the spring production and processing capacity and quality. For example, after the spring is heat-treated, due to the precision and operation of the winding equipment itself, and the deformation after heat treatment, the existence of the spring error seriously affects the mechanical properties of the spring. In the current production, most manufacturers arrange the shaping process, which is all backward or even manual operation and shaping on the shaping machine. The existing shaping equipment uses a belt-driven crank slider mechanism, and the shaping punch is directly and slippery. The block is fixed and the degree of mechanization is low. It is necessary to manually hold the spring to shape each pitch. The other defect is the low precision of machining. The spring is placed under the inclined punching surface of the shaping punch to improve the efficiency and quality of the spring production. People are looking forward to a kind of shaping equipment with efficient efficiency, convenient operation and high processing precision.
1 The analysis of the motion scheme of the opener shows that the wire is moved along the spiral when the spring is wound. Based on this analysis, the author proposes a new scheme for spring shaping machining. The workpiece spring rotates around its own axis, and the open joint member opener wheel moves axially relative to the spring, thereby continuously and uniformly shaping the spring pitch to the paper requirement. . Exercise Plan 1. With this exercise program, it takes only 20 seconds to process a spring and the production efficiency is increased by 56 times. The proposal of this exercise program breaks through the frame of the existing plastic equipment, and the practice proves that the plan is correct and reasonable.
2 The main transmission structure of the opener is correct and reasonable. The motion plan is realized by the practical transmission structure. The rotation of the spring is the main motion to be guaranteed by the machine. There are many ways to realize the rotation of the spring, but considering the structural characteristics of the spring itself and the convenience of processing, the roller that is synchronously rotated in the same direction is selected, and the spring 1 is rotated by the friction transmission; on the other hand, the open wheel is supported by the large gap. The shaft is matched. When the open-end wheel is pressed twice by the fixed-pressure wedge spring, the spring rotation will inevitably produce the relative rotation and axial movement of the open-end wheel and the spring by the friction between the spring and the open-end wheel, thereby completing Relative spiral rotation required for processing. Friction roller transmission scheme 2.
In order to improve the Jiading of the opening machine. Range, and ensure that the spring is always wedged when the open wheel is machined. The open wheel uses a self-locking screw drive to control the upper and lower positions of the open wheel relative to the spring. Transmission scheme 3 The upper and lower adjustments of the open-end wheel are controlled by the travel switch, and the downward direction increases the pitch; the upward line and the pitch decrease. For high-precision springs, it is difficult to control the pitch accuracy of the stroke switch. Therefore, the machine is also equipped with a manual fine adjustment mechanism. That is, the parallel screw-shaped mechanism is used at the lower end of the two screw rods, and the two lead screws are manually rotated synchronously, thereby realizing the upper and lower fine adjustment of the open-end wheel. In order to realize the spring processing of different outer diameters, the two friction series drive the friction wheel transmission and the spiral transmission several kinds of common mechanical transmissions in the horizontal direction to complete the processing of the spring pitch trimming, and realize the efficient and reliable continuous processing operation, and the processing quality is also Significantly improved.
3 The main design of the opener is to calculate the friction between the friction roller and the spring. The friction between the two friction rollers and the spring is known as the friction force FINfi1 provided by the two friction rollers. The pressure between the spring and the friction roller is the spring and the friction roller. The coefficient of friction between. Among them, the open-end wheel is 6 , which is the angle between the friction roller and the center of the spring and the vertical line is the pressure of the open-end wheel pair spring.
It can be seen from 41 that the open-end wheel is affected by the reaction force of two adjacent springs and the reaction force of the support shaft; it can be decomposed into the axial component force and the radial component force, and the difference is; 2 is the magazine pitch at the unloading The amount of recovery afterwards, in the range of A2=l3Omm, is related to the size of the spring material and is determined on site by machining. After obtaining the 艮, the 艮 value can be obtained, and the eye position is the open wedge angle.
At this point, we can find the ruler from the 3rd formula, and find the household by the 4th formula; from the above formula, we can know that the work is determined by the processing needs, the pressure is the open wheel, the angle is determined and changes with the change of the enthalpy, and the friction roller and the workpiece The friction between the two is related to the 艮. When the knuckle is manufactured, the relative position between the two friction rollers is adjusted during use, and the center distance between the two wheels is changed, thereby changing 0 to obtain different factory values, and also by replacing different wedges. The corner opener turns to change the factory value.
Observing the shaping process of the machine, the workpiece can be regarded as an intermediate friction wheel, which is driven by the friction roller and drives the opening wheel to rotate by friction, so that the open wheel and the workpiece move relative to each other.
Take the open-end wheel for the analysis of the separator.
The rolling friction coefficient 节=,5 between the pitch wheel and its support shaft is the same as the diameter of the contact between the open wheel and the workpiece.
According to the friction wheel transmission condition, there is a friction coefficient between the workpiece and the opening wheel; the rest of the code is the same as above.
5 is the calculation formula of the corpse, and 8 is the friction transmission condition check type. When the formula 8 cannot be satisfied, other parameters such as 3 can be changed without changing the conditions, only, etc., so that the equation 8 is satisfied.
After the nectar is determined, the main motor power can be determined from the roller speed.
3.2 Cycloid design The calculation of the compact pressure is the working load of the Cycloid drive. Due to space limitations, the design calculation is omitted.
4 Conclusion The use of an open machine instead of the existing shaping machine. It can greatly improve the processing capacity and processing quality of the equipment, and it is convenient and reliable. For the processing of large and medium-sized compression springs, the effect is more significant. 0 In the machining, the workpieces that are inconveniently chucked or driven by the mandrel can be borrowed from the machining method of the machine and driven by friction wheels.
In the design, there is a breakthrough in the processing principle and method from the traditional shaping machine. The intermittent processing is continuous processing, and the manual operation is the axial movement of the mechanical action. The design of the machine is reasonable and worthy of promotion in professional manufacturers.
The structure is simple and easy to adjust.
The friction wheel drive used in this machine, the slewing drive gear drive belt drive, etc. can be combined into teaching, as the design of the relevant chapters, can enhance the practicality of teaching.
Reference text, Shen Yongsheng. Mechanical family theory tutorial. Beijing, China University Press, 1999.
12 Yi Yihuai. Mechanical design, thief. Beijing Education Consulting, 997.
13 Zhang Yinghui. reed. Beijing Machine Industry Press. 982 4 Shen Leian. Liu Xiangfeng. Mechanical Design Foundation Beijing, China University Press Yi Qidi teaching and research work. There are many articles on the skin.
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