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Structural optimum design method for relieving cam

A technology of optimizing design and cam, applied in the direction of design optimization/simulation, calculation, special data processing application, etc., can solve the problems of vibration and noise of shovel mechanism and reduce the machining accuracy of workpiece.

Inactive Publication Date: 2017-07-14
NORTHEASTERN UNIV
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Problems solved by technology

This will bring vibration and noise to the shoveling mechanism and directly reduce the machining accuracy of the workpiece

Method used

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  • Structural optimum design method for relieving cam
  • Structural optimum design method for relieving cam
  • Structural optimum design method for relieving cam

Examples

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example 1

[0100] Example 1: Three-lift cam design

[0101] In this example, the three-lift H-type shovel tooth cam is used as the optimal design object. Such as Figure 8 As shown, the follower of the three-lift H-type shovel cam has three rising strokes in one revolution cycle. Different from the traditional single-lift shovel cam, the working profile of the three-lift shovel cam is rotationally symmetrical, and its geometric center coincides with the center of rotation. At high speeds, the tri-lift cams have less spindle load. The design constraints of the three-lift H-type shovel cam are listed in Table 3, in which the cam theoretical profile curvature, pressure angle distribution, initial displacement of the follower and the value range of the offset ensure the rationality of the design solution.

[0102] Table 3 Design constraints of the three-lift shovel cam

[0103]

[0104] The optimal design model of the three-lift H-type shovel cam is established by formula (11), and th...

example 2

[0110] Example 2: Four-lift cam design

[0111] In this example, the four-lift H-type shovel tooth cam is used as the optimal design object. Such as Figure 12 The cam shown has four follower strokes. Similar to the three-lift cam, the working profile of the four-lift cam is rotationally symmetrical, its geometric center coincides with the center of rotation, and the inertial force is small in high-speed situations. A four-lift cam performs four feed movements per revolution. The design constraints of the four-lift shovel cam are listed in Table 6. The value ranges of cam theoretical profile curvature, pressure angle, follower initial displacement and offset ensure the rationality of the design solution. The area of ​​the four-lift cam is larger than that of the three-lift cam. Under the condition of a certain size of the shoveling mechanism, the upper limit of the initial displacement of the follower in the four-lift scheme is slightly lower.

[0112] Table 6 Design param...

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Abstract

The present invention provides a structural optimum design method for a relieving cam, and belongs to the technical field of mechanical design. The method specifically comprises: (1) according to a design requirement, determining a basic design parameter and a constraint condition of a relieving cam; (2) giving an H-type follower motion law curve equation; (3) determining a theoretical profile parameter equation of the cam, a working profile parameter equation, a tool center trajectory parameter equation and a cam area calculation formula, and further determining calculation formulas of a theoretical profile curvature and a pressure angle; (4) establishing an optimum design mathematical model of a H-type relieving cam; and (5) constructing an augmented objective function, and solving a cam structural optimum design problem by using a polynomial variation particle swarm optimization method. The structural optimum design method for the H-type relieving cam provided by the present invention has the characteristics of a simple calculation process and high adaptability, and provides a new idea for design and performance research of the cam of the shovel mechanism.

Description

technical field [0001] The invention belongs to the technical field of mechanical structure design, and in particular relates to a structural optimization design method of a shoveling cam in a shoveling mechanism. Background technique [0002] The document "Flores P.A Computational Approach for Cam Size Optimization of Disc Cam‐Follower Mechanisms With Translating Roller Followers[J]. Journal of Mechanisms Robotics, 2013,5(4):041010–041010." The mathematical model of the optimal design problem of the moving roller follower cam constrained by the allowable pressure angle and the minimum curvature radius is solved by using the built-in function fmincon of MATLAB, and good design results are obtained. However, the mathematical model given by Flores does not limit the allowable range of pressure angle and curvature, which may affect the rationality of the design results. [0003] The basic working principle of the shovel tooth cam is as follows: figure 1 shown. The rake face ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 张义民梁松胡鹏
Owner NORTHEASTERN UNIV
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