CN113361041A - Cam mechanism motion analysis simulation system based on UG - Google Patents
Cam mechanism motion analysis simulation system based on UG Download PDFInfo
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- CN113361041A CN113361041A CN202110691440.6A CN202110691440A CN113361041A CN 113361041 A CN113361041 A CN 113361041A CN 202110691440 A CN202110691440 A CN 202110691440A CN 113361041 A CN113361041 A CN 113361041A
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Abstract
The invention relates to a cam mechanism motion analysis simulation system based on UG, which is characterized in that UG software is taken as a platform, a straight-moving push rod cylindrical cam mechanism is taken as an example, UG expressions and regular curve commands are used for obtaining a profile curve of a cylindrical cam, so that an accurate cam profile modeling is obtained, then three-dimensional dynamics simulation is carried out, the displacement, the speed and the acceleration of the push rod are analyzed, the cam curve is designed by a polynomial fitting method on the premise of keeping key points determined by an original cam mechanism for realizing functions, the conductibility and the continuity of the cam curve at the key points are improved, and the problems of impact, abrasion, fatigue damage, noise and the like in the operation of the cam mechanism are effectively solved.
Description
Technical Field
The invention relates to the technical field of cam mechanism motion analysis, in particular to a cam mechanism motion analysis simulation system based on UG.
Background
The cam mechanism can almost complete various speed changing movements, can adjust the speed as required, and has high precision and low cost, so the cam mechanism is still applied to many occasions in modern machinery. There are many ways to improve the accuracy of the cam mechanism in operation, and the design of the cam curve is the most important and efficient of these. The traditional research method for the cam curve is to combine some commonly used motion curves at present to meet the actual motion requirements of the cam, and a plurality of commonly used standard cam curves are formed, but the combined motion curve is not continuous at a high-order derivative, and as the operation speed of the cam mechanism is continuously improved, the old cam curve cannot meet the requirements of the dynamics characteristics under the condition of meeting the requirements of the kinematics characteristics;
at present, the continuity of a cam curve can be effectively improved by a polynomial design method, but when the cam curve is designed by using a polynomial, the situation that the local displacement control condition is too much is often met, the polynomial power is too high by using a polynomial interpolation method and is not beneficial to processing, and the polynomial power can be effectively controlled by using a polynomial fitting method.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a cam mechanism motion analysis simulation system based on UG to solve the above-mentioned technical problems.
In order to achieve the purpose, the invention is realized by the following technical scheme: the cam mechanism motion analysis simulation system based on UG is characterized in that UG software is used as a platform, a linear motion push rod cylindrical cam mechanism is used as an example, UG expressions and regular curve commands are used for obtaining a profile curve of a cylindrical cam, so that an accurate cam profile modeling is obtained, then three-dimensional dynamics simulation is carried out, and push rod displacement, speed and acceleration are analyzed to optimize and design the mechanism;
the method comprises the following specific steps:
the method comprises the following steps: setting the size of a space cam to construct a three-dimensional model and setting the three-dimensional models of a roller 7, a push rod and a rack, namely setting the rack as a first fixed connecting rod, setting the space cam as a second connecting rod, setting the roller 7 as a third connecting rod and setting the push rod as a fourth connecting rod;
step two: the first connecting rod selects the circumference of the camshaft, three steps of ' selecting a second connecting rod (cam), ' specifying an origin (circle center), ' specifying an orientation (normal of the plane where the circle is located) are completed, and the second connecting rod selects the rack; completing the addition of a rotating pair; similarly, the roller 7 is connected with the push rod by a rotating pair, and the push rod is connected with a rack sliding pair;
step two: selecting an insertion part, a kinematic pair and a sliding block, wherein the first connecting rod selects the circumference of one end of a push rod, three steps of ' selecting a connecting rod (push rod), ' specifying an origin (circle center), ' specifying a direction (normal of a plane where a circle is located) are completed, and the second connecting rod selects a rack; finishing the addition of the sliding pair;
step three: defining that the motion of the motion driving space cam mechanism is uniform-speed driving; the rotating pair of the space cam is set as a driving part, and the initial speed is set to be 1-10 degrees.
Step four: add collision selection insert, connector, 3D collision, enter numerical values in the 3D collision dialog. Selecting a roller 7 and a cam in the contact body respectively, and adding collision between the roller and the cam;
step five: when motion simulation UG is used for motion simulation, 2 parameters of time and steps are required to be input, the resolving time of the space cam mechanism is set to be 0.5s-1.2s, and the steps are 60-120;
step six: the motion model is newly built, the motion of the push rod needs to be calculated, and the UG-based motion simulation of the space cam mechanism is realized.
Further, in the first step, converting the space cam curve parameter equation into an equation according with UG regulation by converting the space cam curve parameter equation into the equation according with UG regulation and manually inputting the equation into the expression, wherein X is 50cosq Y, 50sinq Z, 50sinq + h00 degrees and q degrees are less than or equal to 360 degrees; and generating a cam profile curve from the regular curve.
Further, in the first step, the radius r0 of the cam base circle is 50 mm; eccentricity e is 10 mm; follower stroke s is 26 mm.
Furthermore, in the fifth step, a rotating pair of the space cam is used as a driving piece, and the initial speed is set to be 6 degrees.
Further, when the motion simulation UG is performed in the step five, 2 parameters of time and number of steps need to be input, the calculation time of the space cam mechanism is set to 1.1s, and the number of steps is 101.
In summary, the invention provides a cam mechanism motion analysis simulation system based on UG, which only adopts straight lines to connect key points during cam curve and uses rounding design method at the connection to overcome the defects, and designs the cam curve by polynomial fitting method on the premise of keeping the key points determined for realizing the function of the original cam mechanism, thereby improving the conductibility and continuity of the cam curve at the key points, and effectively solving the problems of impact, abrasion, fatigue damage, noise, etc. during the operation of the cam mechanism.
Drawings
FIG. 1 is a schematic view of the cam configuration of the present invention;
FIG. 2 is a parameter schematic of a cam curve equation of the present invention;
FIG. 3 is a schematic view of the cam of the present invention in uniform motion;
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the invention is a cam 5 mechanism motion analysis simulation system based on UG, which is characterized in that UG software is taken as a platform, a straight push rod cylindrical cam 5 mechanism is taken as an example, and a UG expression and a regular curve command are used to obtain a profile curve of a cylindrical cam 5, so as to obtain an accurate cam 5 profile modeling, then three-dimensional dynamics simulation is performed, and push rod displacement, speed and acceleration are analyzed to optimize the design of the mechanism;
the method comprises the following specific steps:
the method comprises the following steps: setting the size of a space cam 5 to construct a three-dimensional model and setting the three-dimensional models of a roller 7, a push rod and a rack, namely setting the rack as a fixed connecting rod I1, setting the space cam 5 as a connecting rod II 2, setting the roller 7 as a connecting rod III 3 and setting the push rod as a connecting rod IV 4;
step two: the first connecting rod selects the shaft circumference of the cam 5, three steps of selecting a second connecting rod 2 (the cam 5), designating an origin (a circle center) and designating an orientation (a normal line of a plane where the circle is located) are completed, and the second connecting rod selects a rack; completing the addition of a rotating pair; similarly, the roller 7 is connected with the push rod by a rotating pair, and the push rod is connected with a rack sliding pair;
step two: selecting an insertion part, a kinematic pair and a sliding block, wherein the first connecting rod selects the circumference of one end of a push rod, three steps of ' selecting a connecting rod (push rod), ' specifying an origin (circle center), ' specifying a direction (normal of a plane where a circle is located) are completed, and the second connecting rod four 4 selects a rack; finishing the addition of the sliding pair;
step three: defining that the motion of the motion driving space cam 5 mechanism is the uniform speed drive; the rotating pair of the space cam 5 is set as a driving part, and the initial speed is set to be 1-10 degrees.
Step four: add collision selection insert, connector, 3D collision, enter numerical values in the 3D collision dialog. Selecting a roller 7 and a cam 5 in the contact body respectively, and adding collision between the two;
step five: when motion simulation UG is used for motion simulation, 2 parameters of time and steps are required to be input, the resolving time of the space cam 5 mechanism is set to be 0.5s-1.2s, and the steps are 60-120;
step six: the motion model is newly built, the motion of the push rod needs to be calculated, and the UG-based motion simulation of the space cam 5 mechanism is realized.
Further, in the first step, a curve parameter equation of the space cam 5 is converted into an equation which is in accordance with UG (Unigraphics) regulation by converting the curve parameter equation of the space cam 5 into an equation which is in accordance with UG regulation and manually inputting the equation into the expression, wherein X is 50cosq Y, 50sinq Z is 50sinq + h00 degrees and q is not more than 360 degrees; and the profile curve of the cam 5 is generated by the regular curve.
Further, in the first step, the base radius r0 of the cam 5 is 50 mm; eccentricity e is 10 mm; follower stroke s is 26 mm.
Further, in step five, the rotating pair of the space cam 5 is set as a driving member, and the initial speed is set to 6 degrees.
Further, when the motion simulation UG is performed in the step five, 2 parameters of time and number of steps need to be input, the resolving time of the space cam 5 mechanism is set to 1.1s, and the number of steps is 101.
In summary, the invention provides a cam 5 mechanism motion analysis simulation system based on UG, which is characterized in that during the cam 5 curve, the design method of connecting all key points by straight lines and rounding at the connection points only is adopted to overcome the defects, and on the premise of keeping the key points determined for realizing the functions of the original cam 5 mechanism, the cam 5 curve is designed by a polynomial fitting method, so as to improve the conductibility and continuity of the cam 5 curve at the key points and effectively solve the problems of impact, abrasion, fatigue damage, noise and the like during the operation of the cam 5 mechanism.
Claims (5)
1. The cam mechanism motion analysis simulation system based on UG is characterized in that UG software is used as a platform, a linear motion push rod cylindrical cam mechanism is used as an example, UG expressions and regular curve commands are used for obtaining a profile curve of a cylindrical cam, so that an accurate cam profile modeling is obtained, then three-dimensional dynamics simulation is carried out, and push rod displacement, speed and acceleration are analyzed to optimize and design the mechanism;
the method comprises the following specific steps:
the method comprises the following steps: setting the size of a space cam to construct a three-dimensional model and setting the three-dimensional models of a roller 7, a push rod and a rack, namely setting the rack as a first fixed connecting rod, setting the space cam as a second connecting rod, setting the roller 7 as a third connecting rod and setting the push rod as a fourth connecting rod;
step two: the first connecting rod selects the circumference of the camshaft, three steps of ' selecting a second connecting rod (cam), ' specifying an origin (circle center), ' specifying an orientation (normal of the plane where the circle is located) are completed, and the second connecting rod selects the rack; completing the addition of a rotating pair; similarly, the roller 7 is connected with the push rod by a rotating pair, and the push rod is connected with a rack sliding pair;
step two: selecting an insertion part, a kinematic pair and a sliding block, wherein the first connecting rod selects the circumference of one end of a push rod, three steps of ' selecting a connecting rod (push rod), ' specifying an origin (circle center), ' specifying a direction (normal of a plane where a circle is located) are completed, and the second connecting rod selects a rack; finishing the addition of the sliding pair;
step three: defining that the motion of the motion driving space cam mechanism is uniform-speed driving; the rotating pair of the space cam is set as a driving part, and the initial speed is set to be 1-10 degrees.
Step four: add collision selection insert, connector, 3D collision, enter numerical values in the 3D collision dialog. Selecting a roller 7 and a cam in the contact body respectively, and adding collision between the roller and the cam;
step five: when motion simulation UG is used for motion simulation, 2 parameters of time and steps are required to be input, the resolving time of the space cam mechanism is set to be 0.5s-1.2s, and the steps are 60-120;
step six: the motion model is newly built, the motion of the push rod needs to be calculated, and the UG-based motion simulation of the space cam mechanism is realized.
2. The cam mechanism motion analysis simulation system based on UG as claimed in claim 1, wherein in step one, the space cam curve parameter equation is converted into an equation which is in accordance with UG and is manually input into an expression, wherein X is 50cosqY and 50sinqZ are 50sinq + h00 degrees and q degrees and is less than 360 degrees; and generating a cam profile curve from the regular curve.
3. The UG-based cam mechanism motion analysis simulation system of claim 1, wherein in the first step, the radius r0 is 50 mm; eccentricity e is 10 mm; follower stroke s is 26 mm.
4. The UG-based cam mechanism motion analysis simulation system of claim 1, wherein in step five, the rotating pair of the space cam is set as the driving member, and the initial speed is set to 6 degrees.
5. The cam mechanism motion analysis and simulation system based on UG (user generated content) according to claim 1, wherein in the step five, when motion simulation UG is carried out, 2 parameters of time and step number are required to be input, the resolving time of the space cam mechanism is set to be 1.1s, and the step number is 101.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110691440.6A CN113361041A (en) | 2021-06-22 | 2021-06-22 | Cam mechanism motion analysis simulation system based on UG |
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| CN202110691440.6A CN113361041A (en) | 2021-06-22 | 2021-06-22 | Cam mechanism motion analysis simulation system based on UG |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108216799A (en) * | 2017-11-30 | 2018-06-29 | 上海东富龙科技股份有限公司 | The optimization of cam and modeling method in a kind of bottle placer cam transport mechanism |
| CN108228980A (en) * | 2017-12-19 | 2018-06-29 | 江南大学 | A kind of Cover whirling Machine Design of cam curves method based on fitting of a polynomial |
-
2021
- 2021-06-22 CN CN202110691440.6A patent/CN113361041A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108216799A (en) * | 2017-11-30 | 2018-06-29 | 上海东富龙科技股份有限公司 | The optimization of cam and modeling method in a kind of bottle placer cam transport mechanism |
| CN108228980A (en) * | 2017-12-19 | 2018-06-29 | 江南大学 | A kind of Cover whirling Machine Design of cam curves method based on fitting of a polynomial |
Non-Patent Citations (1)
| Title |
|---|
| 李银标: "《基于UG的空间凸轮机构的运动仿真》", 《数字技术与应用》, vol. 36, no. 3, pages 1 - 2 * |
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