A general framework for geometry design of indexing cam mechanism

Chang, Zongyu; Changmi, Xu; Pan, Tongqing; Wang, Lei; Zhang, Xichao

doi:10.1016/j.mechmachtheory.2009.05.010

Cited by 24 publications

(10 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained equation is still needed to verify whether there is a theoretical solution. According to the above principles, this article has put forward an original cam milling method as shown in Figure 7: First is to use the cutter whose diameter is slightly smaller than the follower roller's as the rough machining cutter 12 and to choose the bilateral cutter path as the milling route to form the cam's prototype. This procedure will form a slightly thicker cam ridge than the target one, and the redundant part is the finishing machining allowance in the next step.…”

Section: Milling Methodsmentioning

confidence: 99%

“…Axis shifting error. When surface flatten method 12 is used to design a trajectory of a follower, it overlooked an issue: the follower rollers' central axis will shift from its original place during the cam's rotation process (Figure 3). Point C is not always in plane XOZ in an index cycle but will twice penetrate the plane.…”

Section: Error Analysismentioning

confidence: 99%

“…The directional movement vector is in cutter's orthogonal plane. So the goal is to find a set of points that in a series of cutter's orthogonal plane by equations (11), (12), and (14).…”

Section: Unilateral Cutter Path Trajectory Equation Derivationmentioning

confidence: 99%

See 2 more Smart Citations

Research on cylindrical indexing cam’s unilateral machining

Chen

Zhang

et al. 2015

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The cylindrical cam ridge of the indexer is a spatial curved surface, which is difficult to design and machine. The cylindrical cam has some defects after machining because conventional machining methods have inaccuracies. This article aims at proposing a precise way to machine an indexing cam, using basic motion analysis and analytic geometry approach. Analytical methodology is first applied in the cam's motion analysis, to obtain an error-free cam follower's trajectory formula, and then separate the continuous trajectory curve by thousandth resolution, to create a three-dimensional discrete trajectory curve. Planar formulae and spherical formulae can be built on the loci. Based on the machine principle, the cutting cutter's position and orientation will be taken into account. This article calculates the formula set as presented previously and obtains the ultimate cutter path coordinate value. The new error-free cutter path trajectory is called the unilateral machining trajectory. The earned results will compile into numerical control processing schedule. This processing methodology gives a convenient and precision way to manufacture a cylindrical indexing cam. Experimental results are also well supported.

show abstract

Section: Milling Methodsmentioning

confidence: 99%

Section: Error Analysismentioning

confidence: 99%

See 1 more Smart Citation

Research on cylindrical indexing cam’s unilateral machining

Chen

Zhang

et al. 2015

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…Intermittent motion mechanisms are widely used in mechanical engineering [1][2][3][4][5][6]. The most widespread practical application they received in semiautomatic and automatic machinery, instruments, watches, projectors, ordinance machine tools, as well as in printing, packaging, transfer lines, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental kinematic analysis of an intermittent motion planetary mechanism with elliptical gears

Prikhodko¹

2020

J. meas. eng.

View full text Add to dashboard Cite

Intermittent motion mechanisms are widely used in semiautomatic and automatic machinery. Currently, the most common are mechanisms with a one-way coupling or mechanisms of variable structure. The intermittent movement in these mechanisms is provided by breaking the kinematic chain, so their use is undesirable in high-speed machines. The paper presents and analyzes kinematics of planetary transmission with elliptical gears, which performs intermittent motion of output link without interruption of kinematic chain. A kinematic model of the mechanism is constructed, and there are obtained equations for determining the velocity analogue of the output link of the planetary gear. An experimental verification of the adequacy of the developed mathematical model was carried out on the example of studying the position function of the mechanism. The measurement errors were estimated using statistical methods. Using the chi-squared test, the hypothesis of a normal distribution of measurement errors was verified, and confidence interval was determined.

show abstract

“…Erdman [7] gave reviews of many studies on the cam mechanisms. The four applied approaches to the derivation of cam surfaces are based on the offset surface method [8][9][10], the screw theory [11][12][13], the envelope theory [14][15][16] and the conjugate theory [17][18][19][20][21]. Among them, the method based on the conjugate theory and the offset surface method are mainly applied.…”

Section: Introductionmentioning

confidence: 99%