Process design of multi track space cam for the ho

2022-08-05
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Process design of multi track spatial cam of high-speed cigarette packaging machine (Part I)

[Abstract] through the analysis of the function, structure and function of multi track spatial cam in high-speed cigarette packaging machine, the difficult problems of machining are found, and the corresponding solutions are taken. By applying the theory and practical experience of machining, a scientific, reasonable, operable and economic multi track spatial cam process design scheme is formulated. The scientific, rational, reliable and economical nature of the multi track spatial cam process design scheme has been verified through the process trial production and the trial operation of the new product YB47 high speed cigarette packaging machine (550 packages/minute). It lays a foundation for the development and application of high-precision and complex multi track spatial cam in ultra-high speed cigarette packaging machine

[Key words] high speed multi track spatial cam NC program four axis four linkage

1 preface

with the rapid development of cigarette packaging machine technology, spatial cam indexing mechanism has been widely used in various cigarette packaging machines. In addition to the perfection and improvement of the new packaging machine in terms of packaging form and packaging quality, one of the most important parameters is the obvious improvement of packaging speed. From the original medium speed cigarette packaging machine with less than 500 packages/minute to the current high-speed cigarette packaging machine with more than 500 packages/minute, foreign countries have developed 800 packages/minute or even higher speed ultra-high speed cigarette packaging machines. The packaging action of high-speed cigarette packaging machine is mainly realized through the high-speed movement of multi track spatial cam indexing mechanism. Therefore, as a key part, multi track spatial cam plays a very important role in the indexing mechanism of high-speed cigarette packaging machine. The development of high-speed cigarette packaging machine technology is closely related to the application of spatial cam, especially the multi track spatial cam indexing mechanism. Both Britain and Germany judge the flame retardancy of exterior wall external insulation system through model fire test, which can not be replaced by other mechanisms. In our new product YB47 high-speed cigarette packaging machine (550 packages/minute), the multi track spatial cam indexing mechanism of G.D company X3000 cigarette packaging machine (700 packages/minute) is adopted. As a part of high pair mechanism, the manufacturing complexity of high-precision spatial cam puts forward new requirements for process design

2 process design of multi track spatial cam

2.1 comparison and analysis of multi track spatial cam structure

when the speed of spatial cam is n 500rpm, it is a high-speed spatial cam. The higher the rotating speed of spatial cam indexing mechanism, the greater the dynamic load, so the inertia force, impact force and vibration also increase, which has a great impact on the indexing accuracy and the stability of motion transmission of the mechanism. Figure 1 and Figure 2 respectively show 1bbg spatial cam in YB47 (550 packages/minute) and yb45.11 in YB45 (400 packages/minute) Through comparison, the following differences are obtained:

a. the speed is n=550rpm and n=400rpm respectively, and the speed is increased by 37.5%

b. the high-speed spatial cam adopts two tracks (a track and B track) and two rollers to transmit motion. Li Qiangqiang pointed out in his speech that the motion is transmitted by (2) the ribbed steel bar extrusion connector, while the medium speed spatial cam uses a single track and a single roller to transmit motion

c. the accuracy of the high-speed spatial cam track to the positioning reference is ± 0.015mm, and the accuracy of the medium speed spatial cam track to the positioning reference is ± 0.020mm. The dimensional accuracy between two tracks of high-speed spatial cam is ± 0.010mm, and that between two tracks of medium speed spatial cam is ± 0.015mm

d. since the double tracks of the high-speed spatial cam are distributed up and down on the track surface (see Fig. 1 E-E section), the machining depth of the track surface is more than three times that of the medium speed spatial cam

e. the structural rigidity of high-speed spatial cam is lower than that of medium speed spatial cam, and it is easy to deform

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