CN113010970B - Cam design method based on CREO three-dimensional software - Google Patents
Cam design method based on CREO three-dimensional software Download PDFInfo
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- CN113010970B CN113010970B CN201911327842.7A CN201911327842A CN113010970B CN 113010970 B CN113010970 B CN 113010970B CN 201911327842 A CN201911327842 A CN 201911327842A CN 113010970 B CN113010970 B CN 113010970B
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Abstract
The invention relates to a cam design method based on CREO three-dimensional software, which is used for designing the contour of a cam and is characterized by comprising the following steps: s1, establishing and verifying a model, S2, determining driving parameters; s3, determining contour line construction points; s4, acquiring coordinates of the contour line construction points; s5, determining the contour line of the required cam. By means of CREO three-dimensional software, a three-dimensional dynamic simulation model is built for the cam mechanism, and by adopting reverse thinking, according to the motion requirement of an executing piece, the wheel Guo Xian of a required cam is determined efficiently and quickly by simulating the relative motion between the executing piece model and the cam model. The cam design method greatly shortens the design period of the cam, greatly reduces the working strength of designers and the requirements of cam mechanism designs on the service capacity of the designers, realizes the requirements of completing the cam designs in a short time, and improves the correctness of the cam designs.
Description
Technical Field
The invention relates to the field of mechanical design, in particular to a cam design method based on CREO three-dimensional software.
Background
In the conventional cam design, firstly, a phase diagram of an executing piece of the cam mechanism, a base circle radius Rb, a maximum movement distance h of a driven piece (a maximum swing amplitude psi m of a swing driven piece), cam angles corresponding to a push-out period, namely a push-out angle phi and a return leg phi ', and a far repose angle phi s and a near repose angle phi' are determined according to design requirements. Then, a proper follower motion law equation is selected according to the dynamics requirement of the mechanism, so that a mathematical function relation s=s (phi) (phi=phi) between an actuator displacement variable s (a swing follower angular displacement variable phi) and a cam angle variable phi is determined. In practical industrial application, the calculation step delta phi=0.5° or 1 ° of the cam angle variable phi is generally taken, that is, the value of the actuator displacement variable s or ψ is required to be calculated in one period when the cam angle variable phi=0 °, 0.5 °, 1 ° … … ° is calculated, so that the cam can be designed by calculating the coordinates of the theoretical profile of the cam by using the calculation formulas (refer to "cam mechanism design and application innovation") for different cam mechanisms.
For simple plane cam direct motion mechanisms, it is not difficult to find the cam coordinate values, but for complex cam mechanisms, especially cam mechanisms with transmission components between the cam and the actuator, space cam swing actuator mechanisms, eccentric plane cam actuator mechanisms and the like, the mathematical function relation s=s (phi) (psi=ψ (phi)) between the actuator displacement variable s (swing actuator angular displacement variable ψ) and the cam angle variable φ is determined according to the motion law equation, and the calculation amount and the calculation difficulty are very large for the designer, and the accuracy requirements in the calculation process are extremely high, so that the design period of the machine cannot be satisfied by performing cam design according to the conventional method.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a cam design method based on CREO three-dimensional software, which can effectively reduce the difficulty of cam design, shorten the design time, and improve the correctness of cam design.
In order to achieve the above object, the present invention provides a cam designing method based on three-dimensional software of CREO, for designing a profile of a cam, characterized in that: the method comprises the following steps:
s1, model establishment and verification: s11, selecting a proper executing piece and a transmission assembly for connecting the executing piece and the cam according to design requirements, and constructing a cam mechanism together with the cam, wherein the transmission assembly comprises a follower in direct contact with the cam, and the follower is in sliding contact or rolling contact with the cam; s12, establishing a three-dimensional dynamics simulation model of the cam mechanism by using CREO three-dimensional software, wherein the cam model adopts an existing cam model or a cylinder model, and verifying whether the motion simulation of the cam mechanism three-dimensional dynamics simulation model is correct or not in an application-mechanism environment in the CREO software;
s2, determining driving parameters:
determining a phase diagram of the executing piece, a maximum movement distance h of the executing piece, a cam base circle radius Rb, a push angle phi and a return pin phi ', a far repose angle phi s and a near repose angle phi s' according to design requirements; selecting a proper motion law equation, solving a motion variable d of an executive component corresponding to a cam rotation angle phi of the cam in one period of cam rotation, and determining the step length
Obtaining N+1 group phi-d data, < + >>
Wherein, the motion variable d is a linear displacement variable s when the executing piece is a linear motion piece, and the motion variable d is an angular displacement variable ψ when the executing piece is a swinging piece;
s3, determining contour line construction points:
in the environment of an application program-mechanism in CREO software, a Cartesian coordinate system is added at the rotation center of a cam model, a contour line construction point is taken on a follower model, the contour line construction point is the rolling center point of the follower model when the follower model and the cam model are in rolling contact, and the contour line construction point is the sliding contact point between the follower model and the cam model when the follower model and the cam model are in sliding contact;
s4, acquiring coordinates of the contour line construction points:
s41, releasing motion constraint of a cam model and a driven member model in the three-dimensional dynamics simulation model; s42, taking the N+1 group phi-d data obtained in the step S2 as driving data for driving the execution part model to move, and setting the rotation speed of the cam model to be 1 so as to enable the execution part model and the cam model to move simultaneously; s43, measuring X, Y coordinate values of contour line construction points of the follower model relative to a Cartesian coordinate system on the cam model in the process of rotating the cam model for one circle by using a measuring tool of CREO three-dimensional software;
s5, determining the contour line of the required cam:
based on the X, Y coordinate values obtained in S43, a closed curve is obtained, and a desired cam contour line is determined based on the closed curve.
Further, in the step S11, the cam model is similar to the required cam profile.
Further, the follower is a roller in rolling contact with the cam.
Further, in the step S12, in the environment of "application-mechanism" in the CREO software, a servo motor is added to the cam model to drive the cam model to rotate, so as to verify whether the motion simulation model of the cam mechanism is correct.
Further, in the step S2, the step ΔΦ=0.5°.
Further, in the step S2, n+1 groups of phi-d data are edited into PTS files, in the step S42, a servo motor is added to the cam model, the motor speed is set to be 1, a servo motor is added to the actuator model, the PTS files in the step S2 are used as driving data of the servo motor added to the actuator model, and the two servo motors operate simultaneously.
In the step S5, the X, Y coordinate values obtained in the step S43 are first exported to the EXECL file, edited into the PTS file required for modeling the cam in the CREO software, imported into the part modeling module of the CREO software, and then the closed curve is generated according to the coordinates of the points.
Further, the cam is a space cam, the step S4 further includes measuring a Z coordinate value of a contour line construction point of the follower model relative to a cartesian coordinate system on the cam model during one rotation of the cam by using a measuring tool of the CREO three-dimensional software, and in the step S5, a closed curve of the space is obtained according to the X, Y and Z values obtained in the step S4.
As described above, the cam design method according to the present invention has the following advantageous effects:
by means of CREO three-dimensional software, a three-dimensional dynamic simulation model is built for the cam mechanism, and by adopting reverse thinking, according to the motion requirement of an executing piece, the wheel Guo Xian of a required cam is determined efficiently and quickly by simulating the relative motion between the executing piece model and the cam model. According to the cam design method, the design period of the cam is greatly shortened, on the premise of the existing cam mechanism three-dimensional model, a new cam model can be designed according to different movement requirements of an executing piece in one hour, the working strength of a designer and the requirements of the cam mechanism design on the service capacity of the designer are greatly reduced, the requirements of completing the cam design in a short time are met, meanwhile, the cam mechanism can be subjected to kinematic simulation in the design process, and the accuracy of the cam design is improved.
Drawings
Fig. 1 is a schematic structural view of a three-dimensional dynamic simulation model of a cam mechanism in the present invention.
Fig. 2 is a schematic phase diagram of the actuator.
Fig. 3 is a schematic diagram of a cartesian coordinate system established in a cam model.
Fig. 4 is a graph of X, Y coordinate values of contour construction points on a cam model.
Fig. 5 is a closed curve schematic.
Description of element reference numerals
1. Cam model
2. Roller model
3. Swing rod assembly model
4. Connecting rod model
5. Block model
6. Execution part model
7. Closed curve
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the invention, and the relative changes or modifications are not to be construed as essential to the scope of the invention.
Referring to fig. 1 to 5, the present invention provides a cam designing method based on three-dimensional software of CREO, for designing a profile of a cam, comprising the steps of S1 to S5:
s1, model establishment and verification:
and S11, selecting a proper executing piece and a transmission assembly for connecting the executing piece and the cam according to design requirements, and constructing a cam mechanism together with the cam, wherein the transmission assembly comprises a driven piece which is in direct contact with the cam, and the driven piece is in sliding contact or rolling contact with the cam.
In this embodiment, referring to fig. 1, taking the cam mechanism given in fig. 1 as an example, the executing element is a push rod, the driven element in the driving element is a roller, the driving element further includes a swing rod assembly, a connecting rod and a block, and the cam drives the executing element to move linearly through the driving element when rotating.
S12, establishing a three-dimensional dynamics simulation model of the cam mechanism by using CREO three-dimensional software, wherein the cam model 1 adopts an existing cam model or a cylinder model, and verifying whether the motion simulation of the cam mechanism three-dimensional dynamics simulation model is correct or not in an application-mechanism environment in the CREO software.
Referring to fig. 1, fig. 1 is a three-dimensional dynamics simulation model which is built in the CREO software according to a cam mechanism, and in this embodiment, the three-dimensional dynamics simulation model specifically includes a cam model 1, an executing part model 6, and a transmission assembly model, where the transmission assembly model includes a roller model 2, a swing rod assembly model 3, a link model 4, and a block model 5. The cam model 1 can be any existing cam model or can be replaced by a cylinder, and the purpose of the cam model is mainly to verify a three-dimensional dynamics simulation model, preferably, in the embodiment, the cam model 1 is similar to the outline of the cam to be designed. After the three-dimensional dynamics simulation model is created, whether the motion of the three-dimensional dynamics simulation model is correct needs to be verified, namely whether the associated motion among the cam model 1, the executing part model 6 and the transmission assembly model is correct or not is verified, and whether the associated motion accords with the actual motion of the cam mechanism or not. Specifically, in the environment of an application program-mechanism in CREO software, the cam model 1 is used as a driving part, a servo motor can be added on the cam model 1, the cam model 1 is driven to rotate by the servo motor, the cam model 1 drives the roller model 2 to move, and finally the executing part model 6 is driven to move, so that whether the whole motion simulation model is correct or not is verified.
The creation and verification of the motion simulation model of the cam mechanism can be performed by itself, and the detailed description thereof will not be provided herein.
S2, determining driving parameters:
determining a phase diagram of the executing piece, a maximum movement distance h of the executing piece, a cam base circle radius Rb, a push angle phi and a return pin phi ', a far repose angle phi s and a near repose angle phi s' according to design requirements; selecting a proper motion law equation, solving a motion variable d of an executive component corresponding to a cam rotation angle phi of the cam in one period of cam rotation, and determining the step length
Obtaining N+1 group phi-d data, < + >>
Wherein, the motion variable d is a linear displacement variable s when the actuating element is a linear motion element, and the motion variable d is an angular displacement variable ψ when the actuating element is a swinging element.
The method for calculating the motion variable d of the executing member corresponding to the cam rotation angle phi in one period of cam rotation according to the motion law equation can refer to the related design manual, and is not repeated here. In this embodiment, referring to fig. 1 and 2, the actuator is a push rod, and the motion variable d is a linear displacement variable s, and the step ΔΦ=0.5°, so as to obtain 721 sets of Φ -s data. Then, 721 sets of phi-S data can be edited into PTS files for use in the subsequent S3 step as driving data for the servo motor added to the actuator model 6.
S3, determining contour line construction points:
in the environment of an application program-mechanism in CREO software, a Cartesian coordinate system is added at the rotation center of the cam model 1, a contour line construction point is taken on the driven member model, the contour line construction point is the rolling center point of the driven member model when the driven member model and the cam model 1 are in rolling contact, and the contour line construction point is the sliding contact point between the driven member model and the cam model 1 when the driven member model and the cam model 1 are in sliding contact.
Referring to fig. 3, the X-Y plane in the cartesian coordinate system is parallel to the end face of the cam pattern 1. Because two movement forms exist between the follower and the cam, one is sliding contact, namely, the follower directly slides relatively on the cam in the cam movement process, and the contour line construction point is the sliding contact point between the follower model and the cam model 1; the other is rolling contact, see fig. 1, in this embodiment, the follower is a roller, and the roller rotates when the cam rotates, so the contour line construction point is the rolling center point of the follower model.
S4, acquiring coordinates of the contour line construction points:
s41, releasing motion constraint of a cam model 1 and a driven member model in the three-dimensional dynamics simulation model; wherein the motion constraints of the drive assembly model and the implement model remain. The purpose of this step is to separate the movements of the cam model 1 and the follower model from each other, the transmission assembly model and the actuator model 6 still remaining in a correlated movement.
S42, taking the N+1 group phi-d data obtained in the step S2 as driving data for driving the actuator model 6 to move, setting the rotation speed of the cam model 1 to be 1, and enabling the actuator model 6 and the cam model 1 to move simultaneously. Since the CREO software system needs to select the modeling template in the first step of modeling, the units used by the model are already set when the template is selected, so that the units of the movement speeds of the cam model 1 and the actuator model 6 correspondingly keep consistent.
Specifically, in the present embodiment, the rotation of the cam pattern 1 is driven by adding a servo motor, and the motor rotation speed is set to 1. The PTS file of 721 groups of phi-S data edited in the step S2 is used as driving data of the servo motor to drive the push rod model to linearly move by adding a servo motor to the push rod model (namely the executing part model 6), and the curve shown in the figure 2 is the motion curve of the push rod model in one period actually required, so that the mechanism analysis operation is carried out on the three-dimensional dynamic simulation model of the cam mechanism. This step must be noted that the motor added to the cam pattern 1 and the servo motor added to the push rod pattern must be operated simultaneously, while the servo motor speed on the cam pattern 1 must be set to 1.
S43, measuring X, Y coordinate values of the contour line construction points of the follower model relative to the Cartesian coordinate system on the cam model 1 during one rotation of the cam model 1 by using a measuring tool of CREO three-dimensional software.
Specifically, in this embodiment, in the three-dimensional CREO software, after a cartesian coordinate system is added to the rotation center of the cam model 1, a "measurement definition" is established, wherein the "name" is a user-defined "position" option selected from the "type", the "point" or the "motion axis" is the center point of the roller model 2, the "coordinate system" is the cartesian coordinate system established by selecting the rotation center of the cam model 1, the "X component" is selected from the "component", and then an operation of "measurement definition" is performed according to the above-mentioned settings, except that the "Y component" is selected from the "component".
The three-dimensional dynamic simulation model of the cam mechanism is operated once (namely, the cam model 1 rotates for one circle and synchronously reciprocates for one period), so that data of an X component and a Y component in one period can be obtained, and the obtained X component and Y component are measured to obtain the needed X, Y coordinate values, see fig. 4.
S5, determining the contour line of the required cam:
based on the X, Y coordinate values obtained in S43, a closed curve 7 is obtained, and a desired cam contour line is determined based on the closed curve 7. Specifically, the X, Y coordinate value data obtained in step S4 may be exported to an EXECL file, edited into a PTS file required for modeling of a cam in the CREO software, imported in a part modeling module of the CREO software through a "point" command, and then a closed curve 7 is generated with these point coordinates, see fig. 5.
And then, a newly designed cam three-dimensional model is established on the basis of the closed curve 7, so that the whole cam design can be completed. At this time, according to the movement situation between the follower model and the cam model 1, (1) when the follower model and the cam model 1 are in rolling contact, in particular, in this embodiment, the rolling contact is between the roller model 2 and the cam model 1, the contour line construction point is the center point of the roller model 2, at this time, the closed curve 7 is obtained as the theoretical contour line of the required cam, at this time, the actual contour line of the cam can be determined according to the radius of the roller model 2; (2) When the follower model and the cam model 1 are in sliding contact, the contour line construction point is the sliding contact point between the follower model and the cam model 1, and the closed curve 7 is the actual contour line of the required cam.
The required planar cam can be obtained through the steps S1 to S5.
The cam design method of the present invention may also be used for designing a space cam, and is different from a design plane cam in that in step S4, a measurement tool using three-dimensional CREO software is further included to measure a Z coordinate value of a contour line construction point of a follower model relative to a cartesian coordinate system on the cam during one rotation of the cam, the Z coordinate is obtained in the same manner as the X, Y coordinate value, and in step S5, a closed curve 7 of the space is obtained according to X, Y and Z values obtained in S4.
According to the cam design method, reverse thinking is adopted, so that the design period of the cam is greatly shortened, a new cam model 1 can be designed in one hour according to different movement requirements of an executing piece on the premise of an existing cam mechanism three-dimensional model, the working strength of a designer and the requirements of the cam mechanism design on the service capacity of the designer are greatly reduced, the requirements of completing the cam design in a short time are met, meanwhile, the cam mechanism can be subjected to kinematic simulation in the design process, and the accuracy of the cam design is improved.
In summary, the invention effectively overcomes the defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. A cam design method based on CREO three-dimensional software is used for designing the contour of a cam and is characterized in that: the method comprises the following steps:
s1, model establishment and verification:
s11, selecting a proper executing piece and a transmission assembly for connecting the executing piece and the cam according to design requirements, and constructing a cam mechanism together with the cam, wherein the transmission assembly comprises a follower in direct contact with the cam, and the follower is in sliding contact or rolling contact with the cam;
s12, establishing a three-dimensional dynamics simulation model of the cam mechanism by using CREO three-dimensional software, wherein the cam model (1) adopts an existing cam model or a cylinder model, and verifying whether the motion simulation of the cam mechanism three-dimensional dynamics simulation model is correct or not in an application-mechanism environment in the CREO software;
s2, determining driving parameters:
determining execution according to design requirementsPhase diagram of the element, maximum movement distance h of the actuator, cam base radius Rb, push angle Φ and return leg Φ ', far angle of repose Φs and near angle of repose Φs'; selecting a proper motion law equation, solving a motion variable d of an executive component corresponding to a cam rotation angle phi of the cam in one period of cam rotation, and determining the step length
Obtaining N+1 group phi-d data, < + >>
Wherein, the motion variable d is a linear displacement variable s when the executing piece is a linear motion piece, and the motion variable d is an angular displacement variable ψ when the executing piece is a swinging piece;
s3, determining contour line construction points:
in the environment of an application program-mechanism in CREO software, a Cartesian coordinate system is added at the rotation center of a cam model (1), a contour line construction point is taken on a driven member model, when the driven member model and the cam model (1) are in rolling contact, the contour line construction point is the rolling center point of the driven member model, and when the driven member model and the cam model (1) are in sliding contact, the contour line construction point is the sliding contact point between the driven member model and the cam model (1);
s4, acquiring coordinates of the contour line construction points:
s41, releasing motion constraints of a cam model (1) and a driven member model in the three-dimensional dynamics simulation model;
s42, taking the N+1 groups of phi-d data obtained in the step S2 as driving data for driving the executive component model (6) to move, setting the rotation speed of the cam model (1) as 1, and enabling the executive component model (6) and the cam model (1) to move simultaneously;
s43, measuring X, Y coordinate values of contour line construction points of the follower model relative to a Cartesian coordinate system on the cam model (1) in the process of rotating the cam model (1) for one circle by using a measuring tool of CREO three-dimensional software;
s5, determining the contour line of the required cam:
a closed curve (7) is obtained from the X, Y coordinate values obtained in S43, and a desired cam contour line is determined from the closed curve (7).
2. The cam design method according to claim 1, characterized in that: in the step S11, the cam model (1) is similar to the required cam outline.
3. The cam design method according to claim 1, characterized in that: the follower is a roller and is in rolling contact with the cam.
4. The cam design method according to claim 1, characterized in that: in the step S12, under the environment of an application program-mechanism in CREO software, a servo motor is added to the cam model (1) to drive the cam model (1) to rotate, so that whether the motion simulation model of the cam mechanism is correct or not is verified.
5. The cam design method according to claim 1, characterized in that: in the step S2, the step length
6. The cam design method according to claim 1, characterized in that: in the step S2, N+1 groups of phi-d data are edited into PTS files, in the step S42, a servo motor is added to the cam model (1) and the motor speed is set to be 1, a servo motor is added to the executive model (6), the PTS files in the step S2 are used as driving data of the servo motor added to the executive model (6), and the two servo motors operate simultaneously.
7. The cam design method according to claim 1, characterized in that: in the step S5, the X, Y coordinate values obtained in the step S43 are firstly exported to an EXECL file, edited into PTS files required for modeling of the cam in the CREO software, imported into a part modeling module of the CREO software, and then a closed curve (7) is generated by the point coordinates.
8. The cam design method according to claim 1, characterized in that: the cam is a space cam, the step S4 further comprises the step of measuring Z coordinate values of contour line construction points of the follower model relative to a Cartesian coordinate system on the cam model (1) in the process of rotating the cam by using a measuring tool of CREO three-dimensional software, and the step S5 is used for obtaining a space closed curve (7) according to X, Y and Z values obtained in the step S4.
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| WO2017000396A1 (en) * | 2015-06-30 | 2017-01-05 | 中国空间技术研究院 | Truss antenna reflector deployment dynamics modelling method based on multi-body analysis test |
| CN107633152A (en) * | 2017-10-27 | 2018-01-26 | 天津百利机械装备集团有限公司中央研究院 | Ferguson cam mechanism Kinematics Simulation method based on Creo, ADAMS environment |
| CN109359348A (en) * | 2018-09-26 | 2019-02-19 | 北京工业大学 | A kind of Globoidal Indexing Cam Mechanism transmission accuracy analysis method based on parametric modeling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000396A1 (en) * | 2015-06-30 | 2017-01-05 | 中国空间技术研究院 | Truss antenna reflector deployment dynamics modelling method based on multi-body analysis test |
| CN107633152A (en) * | 2017-10-27 | 2018-01-26 | 天津百利机械装备集团有限公司中央研究院 | Ferguson cam mechanism Kinematics Simulation method based on Creo, ADAMS environment |
| CN109359348A (en) * | 2018-09-26 | 2019-02-19 | 北京工业大学 | A kind of Globoidal Indexing Cam Mechanism transmission accuracy analysis method based on parametric modeling |
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