Cam Design and Manufacturing Handbook

Norton, Robert L.

doi:10.1115/1.1723467

Cited by 137 publications

(246 citation statements)

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“…Also, the distance on the expansion surface in accordance with prime cylinder, which corresponds to the expansion length of the arc B 2 A 2 , is obviously longer than D 0 , and the error is proportional to the distance between the trace point and the axis of cylindrical cam. Thus, the expansion method introduced in Shi and Wu 11 and Norton 12 would generate errors, and therefore, it is not suitable for calculating radius of curvature of the planar expansion pitch curve.…”

Section: Existed Errors In Commonly Used Methodsmentioning

confidence: 99%

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Radius of curvature analysis of oscillating follower cylindrical cam’s expansion pitch curve

Chen

Tang

2015

Advances in Mechanical Engineering

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The currently used method to calculate radius of curvature of a cylindrical cam's planar expansion pitch curve produces errors. Therefore, there is an urgent need to find an accurate method for cylindrical cam design. This research utilizes the three-dimensional expansion curve coordinates of the follower's motion track and establishes the planar expansion pitch curve equation with the consideration of deviation angle, which can be easily used to analyze and design an oscillating follower cylindrical cam. The deduced equation of radius of curvature is based on motion law of the mechanism and prime cylinder radius of the cam. The relation curve between minimum radius of curvature and prime cylinder radius, which takes into consideration that planar expansion pitch curve varies with prime cylinder radius in the event of certain motion law, is described by MATLAB, and specific minimum radius of prime cylinder is generated for each allowable radius of curvature according to the relation curve. Thus, geometric parameters of a cylindrical cam can be designed. The feasibility of our methodology is validated with a specific example.

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Section: Existed Errors In Commonly Used Methodsmentioning

confidence: 99%

“…If expanded according to Shi and Wu 11 and Norton, 12 the obtained system equations of coordinates of planar expansion pitch curve are…”

Section: An Example For Design Using This Newly Developed Methodsmentioning

confidence: 99%

Radius of curvature analysis of oscillating follower cylindrical cam’s expansion pitch curve

Chen

Tang

2015

Advances in Mechanical Engineering

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“…The contact problem of cylinders with parallel axes or of a flat elastic body with a "lying" cylinder is very common in practical engineering applications, in particular in mechanical elements such as roller bearings, gears and cams [1,2]. In contrast to the Hertz-like contacts of bodies with curvature in two directions which in engineering mechanics are called "point contacts", the contact of two parallel cylinders is denoted as a "line contact".…”

Section: Introductionmentioning

confidence: 99%

Normal Line Contact of Finite-Length Cylinders

Li¹,

Popov²

2017

FU Mech Eng

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Abstract. In this paper, the normal contact problem between an elastic half-space and a cylindrical body with the axis parallel to the surface of the half-space is solved numerically by using the Boundary Element Method (BEM). The numerical solution is approximated with an analytical equation motivated by an existing asymptotic solution of the corresponding problem. The resulting empirical equation is validated by an extensive parameter study. Based on this solution, we calculate the equivalent MDR-profile, which reproduces the solution exactly in the framework of the Method of Dimensionality Reduction (MDR). This MDR-profile contains in a condensed and easy-to-use form all the necessary information about the found solution and can be exploited for the solution of other related problems (as contact with viscoelastic bodies, tangential contact problem, and adhesive contact problem.)The analytical approximation reproduces numerical results with high precision provided the ratio of length and radius of the cylinder are larger than 5. For thin disks (small length-to-radius ratio), the results are not exact but acceptable for engineering applications.

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“…Due to the advantages of compact structure, high load capacity, high reliability, low noise and low vibration, globoidal cam mechanisms, are widely used in many types of automatic machinery such as machine tool changer, automatic assembly lines, medicine machines, paper processing machines and packing machines [1]. So globoidal cam mechanisms have already become the most popular and precise intermittent device at present.…”

Section: Introductionmentioning

confidence: 99%

Model and Simulation of Globoidal Cam Mechanisms with Oscillating and Dual Stopping Followers

2017

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Abstract. Globoidal cam mechanisms with oscillating and dual stopping followers are necessary to accomplish the rise-dwell-fall-dwell periodic motion.The trajectory surface of roller axis of oscillating globoidal cam mechanism is the offset surface of working surface of the cam, and its mathematical model is relatively simple. According to the spatial geometric relationship, the coordinate equation of trajectory surface of roller axis is derived and the original angle positions for dual stopping followers are analyzed. As a result, the three-dimension (3D) model of globoidal cam mechanism with oscillating and dual stopping followers is generated based on the offset surface method based on the UG software. Finally, the dynamic model is realized using Adams software, and through the dynamic simulation, the oscillating angle displacement, angular velocity and angular acceleration of the double-stop swinging cam mechanism are studied. According to the simulation results, it can be concluded that the input speed of globoidal cam mechanism is an important factor that affects the output performance of the mechanism. Through the above research, it can provide some reference for the design of spatial cam mechanism.

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Cam Design and Manufacturing Handbook

Cited by 137 publications

References 0 publications

Radius of curvature analysis of oscillating follower cylindrical cam’s expansion pitch curve

Radius of curvature analysis of oscillating follower cylindrical cam’s expansion pitch curve

Normal Line Contact of Finite-Length Cylinders

Model and Simulation of Globoidal Cam Mechanisms with Oscillating and Dual Stopping Followers

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