Design and research of rigorous machine mechanisms

Contents

Contents

Introduction

1. Machine Drive Mechanism Synthesis and Analysis and Gear Design

1.1 Determination of the total gear ratio of the machine drive and each of its stages separately

1.2 Selection of number of gear teeth of drive mechanism wheels

1.3 Calculation of initial circle radii of gears, selection

scale factor of length (draw the mechanism diagram

drive)

1.4 Determination of rotation speed of each gear wheel

1.5 Geometric calculation of gear pair whose teeth are required

filter and check its quality indicators

1.6 Calculation of machine engagement of smaller wheel (draw)

2. Kinematic investigation and power analysis of lever mechanism

2.1 Determination of the freedom stages of the mechanism, structural formula of the mechanism

2.2 Construction of mechanism plans and motion cyclogram

2.3 Calculation of speed plans

2.4 Creation of acceleration plans for zero and specified position of the mechanism

2.5 Calculation of forces acting on the mechanism links

2.6 Force analysis by force plan method

2.7 Method of Professor N.E. Zhukovsky

3. Synthesis of cam mechanism

3.1 Construction of kinematic diagrams and determination of scale factors

3.2 Determination of minimum radius of cam and construction of its profile

Conclusion

List of literature

Project Description

Course work: 38 p., 6 Fig., 19 Table, 8 sources of literature.

Work Object:

Strict machine consists of gear planetary drive, main link and additional cam mechanism.

From the electric motor through a gear mechanism consisting of gears 1-6 and carrier H, rotation is transmitted to the main shaft 7, on which the gear 6 and the crank 8 are rigidly fixed. From the crank 8 through the links 9, 10, 11 of the link mechanism, the movement is transferred to the slider 12 which performs the clamping. Motion is transmitted from wheel 6 by means of gears 13,14 to cam mechanism shaft to cam 15. The roller 16 and the pusher 17 feed the blank under the slide 12 of the machine. Spring 18 is required to provide contact between roller 16 and cam 15.

Purpose of work:

Acquisition of practical skills of engineering solution of problems of synthesis and analysis of mechanisms of a particular machine according to specified indicators on the basis of graphoanalytic methods of research.

In course work, the purpose of the machine as a whole and each mechanism separately is established. The working process performed by the machine is studied and described, the relationship in the interaction between the mechanisms of the machine is revealed.

In the graphic part there are made drawings of synthesis of engagement of the specified gear mechanism, kinematic examination of the lever mechanism, as well as synthesis of the cam mechanism. Diagrams of specific sliding of teeth, analogue of accelerations, speed and movement of the pusher are built; plans of speeds, forces and accelerations for the lever mechanism.

GEARS, GEAR RATIO, SPECIFIC SLIDING, CRANK, TORQUE, SPEED PLAN, BALANCING MOMENT, GRAPHICAL INTEGRATION, PHASE ANGLE, CAM PROFILE.

Introduction

Engineering is the main and leading industry, without the proper development of which it is impossible to develop other industries, increase labor productivity, free a person from heavy monotonous physical work. Therefore, more time should be devoted to the study of the theory of machines and mechanisms in higher educational institutions.

The course project considers the issues of the structure of synthesis, kinematics, dynamics, regulation and settlement of gear and cam mechanisms.

The first section of the course project considers the gear drive of the mechanism for kinematic research. Gear ratios selected for number of wheel teeth are calculated.

Scale factor of length is selected, kinematic diagram and speed plans of reduction gear are drawn. Geometrical dimensions of wheel pair are calculated, involute engagement drawing is made.

The section of the second course project considers the kinematics of the mechanism, plans for speeds and accelerations are built. Forces acting on links of mechanism are determined, load schemes of structural groups of Assur are drawn up and reactions in kinematic pairs of mechanism are determined.

On the basis of the graphoanalytic method, diagrams of movement of the cam mechanism follower are built, its main dimensions are determined and a cam washer is drawn. Drawing of actual pressure angle diagram in cam mechanism is executed.

Conclusion

In this course project on the theory of machines and mechanisms, an analysis of the lever mechanism was carried out; structural analysis examined and found the features of the structure of the mechanism - the degree of mobility, the input link, Assur groups that are part of the mechanism, the class of the mechanism; sequence-defining kinematic and dynamic studies.

The gearing synthesis was made: the gearing parameters were calculated, the gearing pattern of one gearing was built, a planetary mechanism was built with calculations of its linear and angular speeds by graphical and analytical methods with a permissible error of no more than 5%.

In the third part, an analysis of the cam mechanism was performed, graphs of accelerations, speeds and angle of rotation of the pusher were built. Kinematic diagram of cam mechanism is drawn.

Синтез зубчатого механизма.cdw

Синтез кулачкового механизма.cdw

Кинематческий анализ механизма.cdw