Indexing Cam Mechanism Research Articles

Design of a novel coaxial cam-linkage indexing mechanism

This paper presents an approach for designing a novel coaxial indexing mechanism composed of conjugate cams and parallelogram linkage. Compared with the conventional indexing cam mechanisms, the mechanism has a more compact mechanical structure thanks to the coaxial input/output shaft arrangement, and produces higher number of stops at the same speed of input shaft. Firstly, on the basis of systematically describing the working principle of the mechanism, the conjugate cam profiles, curvature radius of cam profiles and meshing equation between the cam and roller are established. Then, the main factors affecting the geometric characteristic and the force transmission performance of the mechanism are analyzed. The dimensional synthesis of this mechanism is further researched. Finally, prototypes are developed and experiment is performed to verify the feasibility of the mechanism. The research provides a train of new thoughts for the mechanical design of indexing mechanisms.

Research on Computer Aided Design and Machining of Equipment Globoidal Cam

The Globoidal Indexing Cam Mechanism (Globoidal Indexing Cam Mechanism) is composed of a space cam with a ridge and a turntable with rollers equally divided radially. In this paper, a program for reversing the law of motion of the globular indexing cam mechanism is developed, which realizes the computer-aided design and computer-aided processing of the globular indexing cam, and expounds the method of solving the motion law of the driven disc with the idea of reverse design, using UG twice the development tool UG/Open API realizes the parametric modeling of the globular indexing cam, and introduces the process of using the UG software to process the globular indexing cam surface.

General expression of pressure angle and principal curvature of globoidal indexing cam mechanism

Given the lack of general mathematical model for the parameters of the globoidal indexing cam (GIC) mechanism, a method of modeling the contour for the GIC based on the unified mathematical expression is proposed by applying the envelope theory and the matrix transformation of the homogeneous coordinates. Taking the globoidal cams with cylindrical, conical, and hyperbolic meshing turret-rollers as the research object, a unified mathematical model of profile model for the GIC is derived. On this foundation, the general analytic expression of pressure angle and principal curvature is further obtained, which provides a theoretical basis for the precise design and manufacture of the GIC and provides a mathematical basis for the fatigue strength analysis of the GIC material.

Design of a novel coaxial eccentric indexing cam mechanism

A novel coaxial eccentric indexing cam mechanism (CEC) is proposed for high-speed automatic machineries. In comparison with the conventional indexing cam mechanisms such as parallel, globoidal, cylindrical cam mechanisms as well as the Geneva mechanism, the merits of this novel mechanism are: (1) more compact structure and (2) higher indexing rate. The structure and transmission principle of the mechanism are introduced and the cam profiles are formulated with an emphasis to derive two design criteria. The influences of the geometric parameters on the kinematic performance of the mechanism are also discussed through significant numerical analyses. Finally, the dynamic performance of a virtual prototype is analyzed with the aid of SolidWorks, and the physical prototype is manufactured to verify the validity of this design.

The Influence of Installation Error on the Motion of Spatial Cam Mechanism and Its Simulation

In this paper, taking the camber indexing cam mechanism as an example, the mathematical model of the space cam mechanism motion is established. The influence law of the installation error on the meshing line deviation and the angular displacement error of the cam mechanism is examined. And then the effective suggestion for the error control is proposed.

Modeling and NC Programming of the Cylindrical Indexing Cam Based on Pro/E and UG

To build the cylindrical indexing cam virtual prototype model precisely, the cylindrical indexing cam mechanism has been studied. Based on equation of theoretical contour of cylindrical indexing cam, use the three-dimensional software Pro/E’s powerful parametric modeling segment to design and precisely model the cylindrical indexing cam in a certain automatic production line. Then import the model in UG NX three-dimensional software. Use its NC module to process machining simulation and the programming of CNC machining on the cylindrical indexing cam.Therefor, it has improved the processing quality and efficiency of cylindrical indexing cam. And provided the useful methods and design ideas for further study of cylindrical indexing cam design and manufacturing.

Theoretical and experimental research on dynamics of the inner displaced indexing cam mechanism

According to the demand of high speed and large indexing in automatic machine, a novel inner displaced cam mechanism is presented and researched on dynamics. Multi-degree of freedom dynamics model taking transverse and torsional vibration of input and output shafts into account is established by using lumped parameter method for the mechanism. The natural frequency of the mechanism and the dynamic respond is solved. Based on sensitivity analysis method, the influence of the parameters to the first-order natural frequency is analyzed. The input shaft and the shunt shaft diameters are considered to have more impact on the 1st order natural frequency than the other parameters. Finally, the mode test is carried out to obtain the natural frequencies of the prototype so that the feasibility of the dynamic model is verified.

Research on Design Reuse System of Parallel Indexing Cam Mechanism Based on Knowledge

Design experience using parallel indexing cam mechanism, combined with theoretical knowledge engineering and design reuse, and based knowledge of parallel indexing cam mechanism design reuse systems were researched. Construct a flow chart system, studies the key technology knowledge base, inference engine and other systems to UG for the development platform, the development of a knowledge-based parallel indexing cam mechanism design reuse systems, and through examples of the system can greatly improve the design efficiency.

Design of the Globoidal Cam Mechanism Based on MATLAB and CATIA

Working profile of Globoidal indexing cam is a complex surface. 2D mechanical drawing is difficult to describe it clearly. With the development of computer technology, the 3D design software such as CATIA, Pro-E, Solidworks, UG/NX, the solid and surface function of them make productions more excellent. Globoidal indexing cam profile equations firstly was studied, the geometric size of the globoidal indexing cam mechanism was calculate, and then use MATLAB to calculate the globoidal indexing cam contour surface 3D coordinates of points, finally completed the three-dimensional modeling of globoidal indexing cam in CATIA.

Parametric Design and Kinematics Simulation of the Roller Gear Indexing Cam Mechanism

The working profile of the roller gear indexing cam is sophisticated space curved surface. It is difficult to get the 3D model with conventional cartography. In this paper, a parameter molding method of the roller gear indexing cam based on VB and UG is provided. A system is compiled.The Simulation and Kinematics Analysis of the roller gear indexing cam mechanism can be done after the parameters are completely set. It hopes that the flaw and other problem in design can be found though this simulation and kinematics analysis, which is facilitate the designer to improve the design in time.

The Influence of Overlap Coefficient on Contact Behavior of Globoidal Indexing Cam Mechanism

An method was proposed to derive the formula of the overlap coefficient and the influence of main parameters on overlap coefficient were also discussed; The load distribution is deduced and the rule of contact load varying with overlap coefficient was revealed; The results indicate that the increasing overlap coefficient can extend the time of rollers engaging, reducing the contact load of globoidal indexing cam mechanism and altering the load distribution.

The Parametric Design and Simulation for Globoidal Indexing Cam Mechanism

Globoidal indexing cam mechanism is the spatial indexing mechanism of high speed, high precision and widely used in modern machine and automatic production line.But the working profile of the globoidal indexing cam mechanism is not fair for the space curved surface and it is difficult to model. The traditional design method requires a great deal of calculation, and the design process is complexed, we have to repeat the entire design process when changing any parameters, lead to low design efficiency and poor universality. To solve above disadvantages, this paper used the space meshing principle and space coordinate transformation method, based on 3 d modeling software Pro/ENGINEER, using vc + + and Pro/toolkit for secondary development, realize the parametric modelling of globoidal indexing cam mechanism, and the simulation and analysis of the generated cam mechanism.

Stress Analysis for Globoidal Indexing Cam Mechanism with Steel Ball

This paper presents stress analysis for globoidal indexing cam mechanism with steel ball, and stress model of each component is established. Globoidal indexing cam mechanism with steel ball is made up of globoidal cam, indexing plate and steel ball. The mechanism can realize approximate rolling transmission. Stress is analyzed for globoidal cam, indexing plate and steel ball at dell and indexing period respectively. According to rotary transform tensor theory stress in different coordinate system is obtained to build static equilibrium equations for steel ball conveniently. Axial force, radial force and peripheral force for globoidal cam and indexing plate are reached.

Design and analysis of indexing cam mechanism with parallel axes

The indexing cam mechanism is one of the most crucial mechanisms in automated machinery. This study proposes a simple yet comprehensive method for the design and analysis of an indexing cam mechanism with parallel axes. In the proposed approach, an analytical description of the driving cam profile is obtained using coordinate transformation and conjugate surface theory. Formulae are then derived for the pressure angle of the indexing cam mechanism and the principal curvatures of the driving cam. Finally, the kinematic characteristics of the indexing cam mechanism are analyzed. The validity of the proposed design methodology is verified by machining an indexing cam on a 3-axis CNC machine. The results confirm that the proposed methodology enables the design and manufacturing tasks to be successfully integrated, thereby making possible a flexible, automatic, cost efficient and controllable production process.

Application Research on a Curved CAM Surface Reconstruction Method

Globular indexing CAM mechanism is a good indexing mechanism. As the working curve of CAM contour surface is no extending curved surface, there is certain difficulty to design processing. It is new kinds of design method that reverse engineering apply in rapid modeling of curved CAM. In this way, designer can complete curve of CAM reverse modeling, and the rationality of the model is verified. At the same time, it also can reverse modeling and the subsequent development of other products to provide a reference.

Design of Globoidal Indexing Cam Mechanism CAD System

With globoidal indexing cam mechanism as the object of study, this paper introduces its operating principle, analyzes and calculates its main motion parameters. On the basis of theoretical study, the paper using structured program design method and Visual Basic 6.0 as developing tool analyzes main function modules, such as system parameters input, law of motion, kinematics analysis and pressure angle check, etc. The paper develops globoidal indexing cam mechanism CAD system in simple operation and describes application method of the system and design examples.

Microstructure and Wear Properties Analysis of TiAlN Film Deposited on Cam Profile Using Ion Sputtering

In this study ion beam sputtering deposition was used as a new surface formation technology for strengthening cam surface during the manufacturing process of indexing cam mechanism. Phase exchanging deformation can be avoided in this manufacturing process. Compared to surface quenching processes, the shape accuracy and dimension accuracy can be improved using this method. The microstructure and properties of TiAlN composite film deposited on the profile surface of a cam (made of AISI 1045 steel) by ion beam sputtering deposition were discussed. The microstructural characterizations were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is shown that the fundamental Bragg peak of {111} in TiAlN coatings increased with a bias voltage reduction. The grain size is about 1 μm. The friction coefficient was tested by a rotating wear tester at different loads and speeds. The minimum friction coefficient can be achieved at 0.187.

Selection of B-Spline Degree on Optimal Design of Mechanism

The degree is an important parameter for B-spline. In this paper, as one example of optimal design in mechanism, the optimal design of the cam curve to control the residual vibration of the follower output for an indexing cam mechanism is taken and the effect of the degree of the B-spline to describe the cam curve on the optimization performance is discussed by obtained results.

Geometrical Feature Analysis of the Movement of the New Type of Double-Hemisphere Rolling Gear Globoidal Cam Indexing Mechanism

A novel kind of double-hemisphere rolling gear globoidal indexing cam mechanism was proposed，which can satisfy high speed and precision motion requirement. Fundamental principle and meshing characteristics were studied based on conjugate surface principle. Pure rolling of the transmision mechanism was applicated in engineering，and combination property was improved.

Research and Application on a Multi Head Conjugate Disc Indexing Cam Mechanism

In order to realize the technical performance of high speed, high precision, high stability and high reliability for conjugated indexing mechanism with periodic intermittent rotary motion, a two cams structure has been designed, and its geometry size and profile curve was carefully determined. Also the calculation formula of the contour curve for CAM was deduced. Research achievement has been applied to new equipment of enterprise development, the working performance is stable and reliable, the production efficiency raised by 30% compared to the domestic industry. The mechanism has characteristics of simplified structure, improved transmission performance and low cost.