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Last:Cam and groove coupling basic dimensions and design requirements of the importance of design Next:The introduction about thecurveof cam and groove coupling and the considerations of designing
The selection about the movement principle of cam and groove coupling
Cam and groove coupling regular exercise choice or design , involving many factors . In addition to the work required to meet the specific requirements of machinery , it should also make the cam and groove coupling mechanism has good dynamic characteristics , while also considering the design of cam and groove coupling profiles ease of processing, these factors are often mutual restraint . Therefore, when selecting or designing sports law , must prioritize according to applications , working conditions , considering . Here are some common law of motion for occasions :
First, the constant , in many cases the movement of the work to meet the requirements cam and groove coupling of pushing mechanism , but in the presence of rigid impact position of the start and end of the trip cam and groove coupling , the movement characteristic is the worst curves, etc. speed movement of rarely used alone , and does not apply to , and high speed .
Second, the acceleration and deceleration movement of such a continuous velocity curve , all curves in the maximum acceleration value is the smallest, but the beginning of the stroke of the driven member , and to terminate the acceleration changes from positive to negative acceleration intermediate position limited acceleration value of the mutation will lead to flexible impact , and therefore can not in the high-speed occasions.
Third , the cosine acceleration motion acceleration mutation eliminates mid-stroke position , and easy processing and calculation , the movement can be obtained in reasonably follower when the speed . But this law of motion is used up - stop - back - stop motion , at the start and end of travel position remains flexible due to the impact of the acceleration mutations . When this rule is used up - back - up type movement , then the acceleration curve continuously , no flexible impact .
Fourth, the sine acceleration motion for l - stop - back - stop motion , cam and groove coupling at the start and end positions stroke acceleration no mutation , and thus no impact on flexibility , help organizations running smoothly . But it is used up - stop - back - stop motion , pushing away at the connection point with the return of jerk from a limited positive to negative , and thus the acceleration curve is not continuous . This curve machining accuracy requirements than other curves. Sinusoidal acceleration motion is widely used in medium-speed cam and groove coupling mechanism , but not suitable for high-speed applications.
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