UG is a CAD/CAE/CAM-integrated, manufacturing-oriented high-end software that is widely used in mechanical design, engineering simulation, and digital manufacturing. Its motion analysis module (ScenarioForMotion) can be used to establish the movement mechanism model, perform the mechanism's interference analysis, track the part's movement trajectory, and analyze the displacement, speed, acceleration, force and moment of the components in the mechanism. The clutch press mechanism is the key mechanism for image transfer and printing process on the offset press. The center distances of the blanket cylinder and plate cylinder, and the center distance between the blanket cylinder and the impression cylinder are important dimension parameters, and the rollers can be adjusted and set accurately. Center distance to get the ideal printing pressure]. Usually, the method of analyzing the center distance between the rollers is graphing method and computer aided programming method. As there are many adjustments in the mechanism, such as the adjustment of the support roller, the adjustment of the braces in the pendulum mechanism, and the irregular shape of the cam and the bearing sleeve, the calculation and programming workload is higher when the above method is used for analysis. Big, it brings inconvenience to the analysis of this institution. Using UG software analysis, if you want to understand the parameter values ​​when zero and parts are in different positions, you only need to change the assembly size of zeros and parts in the assembly model, and it will be automatically linked to the motion analysis model. You can get the motion simulation by running the simulation. the result of. This paper takes the mechanical “three-point support†clutch and press mechanism of an offset press as an example, uses UG software to model and simulate the mechanism.
1 "Three-point support" type clutch pressure mechanism
"Three-point support" from the pressure mechanism diagram [3 see Figure 1. The working principle is to achieve the separation and contact between the rollers by changing the center distance between the blanket cylinder 12 and the plate cylinder 13 and between the blanket cylinder and the impression cylinder 1O. In Figure 1, the plate cylinder axis o and the impression cylinder axis o. By installing the rolling bearing in the wall plate hole, the axial position of the roller shaft remains unchanged. The rubber roller shaft o is mounted in a roller bearing, and the roller bearing is mounted in the hole of the bearing sleeve 15. The bearing sleeve is supported by two fixed support roller members 14, 16 and a floating support roller member 11 to determine its center position. Because the outer contour of the bearing sleeve is designed as a special contour curve, when the bearing sleeve rotates along the support roller, the position of the axis of the rubber roller shaft changes, and the purpose of changing the center distance between the rollers is achieved. When the pressure is combined, the pressure cam and linkage mechanism drives the bearing sleeve to rotate counterclockwise so that the blanket cylinder is in contact with the plate cylinder and the impression cylinder in sequence. The process of pressure is the opposite.
From the above knowledge, the change in the center distance between the rollers is mainly caused by the change in the center position of the bearing sleeve, so that the positions of the shafts of the bearings and the rubber roller shafts installed in the holes thereof are changed. The change in the center distance between the rollers is mainly determined by the outer contour of the bearing sleeve. When the machine needs to be debugged or when the thickness of the printed paper changes, the center distance can also be fine-tuned by turning the eccentric shaft on the support roller. FIG. 2 is a schematic diagram of a structure of a support base roller member supporting a bearing sleeve, which is mainly composed of an eccentric shaft, a roller seat, a roller, and a bushing. In Figure 2, O1 is the center of rotation of the eccentric shaft, O2 is the center of the eccentric shaft and roller, and O3 is the center of the hole on the eccentric shaft. The roller seat is connected with the wall plate, and the eccentric shaft is rotated. The roller changes position with the rotation of the eccentric shaft and plays a role of radial adjustment. Assuming that the eccentricity O1O2 is a, the radial adjustment range of the roller is 0 to 2a.
2 Part modeling and assembly of the clutch and pressure mechanism
Run the UG software and enter the Modeling module to perform solid modeling of the parts. The cam and bearing sleeve in the mechanism are all discrete coordinate values. The data points can be generated from the coordinate points of the part. The Spline/Throughpoints/PointsfromFile command can be used to read the data file, draw the outline, and generate the trace by the Extrude command. , Compression cam and bearing cover parts. Figure 3 shows the solid model of the pressure cam.
After constructing the solid model of the part, it enters the assembly module (Assemblies) to virtually assemble the zeros and parts of the combined pressure mechanism. The assembly model is shown in Figure 4. Because it is necessary to analyze the effect on the center-to-center distance between the rollers when the eccentric shafts of the support roller components (14 pieces, 16 pieces in FIG. 1) are located at different positions, the angle assembly parameters are set when the roller components of the support blocks are assembled. As shown in FIG. 2 , the side of the roller seat is set as the reference plane A, and the plane passing through the axis line of the eccentric shaft and passing through the circle center O1 and the circle center O3 is the reference plane B, and the angle pairing parameters are set on the face plane A and the plane B at the time of assembling. Set the eccentric position in Fig. 2 to be 0° away from the maximum position on the A surface. When the eccentric shaft 1 rotates counterclockwise around the roller seat 2 and the set angle is positive, the angle of the marking hole on the eccentric shaft turns to O3'. At 60°, when the eccentric position 02 is at the lowermost end, the angle value is 180°.
3 Create Motion Simulation
After simplification of the assembly master model, the motion simulation module (Motion Simulation) is entered. Creating motion simulations includes creating links, motion pairs, and defining motion drivers.
3.1 Create a link
Relevant parts of the CurveonCurveJoint (including cam, cam follower swinging roller, bearing sleeve, left upper support roller and left lower support roller) to construct auxiliary curves to ensure that the corresponding curve positions are coplanar in the assembly drawing. Add the constructed curves to the ReferenceSets of the respective parts. According to the kinematic relationship of the closing pressure mechanism, refer to the component names shown in Figure 1, and establish the links as follows:
(1) L001: Compression cam 1 and its contour construction curve.
(2) L002: swing rod 3, cam follower swinging roller construction curve, supporting teeth 4.
(3) L003: swing arm 7 and pawl 5.
(4) L004: Pull rod 9.
(5) L005: bearing sleeve 15 and its construction curve, rubber roller 12.
(6) L006: Plate cylinder 13, impression cylinder 1O.
3.2 Definition of motion pair, 3D Contact and Damper
According to the actual working conditions, the definition of sports vice is as follows:
(1) J001: L001 is fixed with the ground, and a revolute is constructed.
(2) J002: L002 is fixed with the ground and Cylindrica1 is constructed.
(3) J003: L003 is fixed with the ground, and a revolute is constructed.
(4) J004: L003 and L004 establish a universal joint motion (Universa1).
(5) J005: Revolute is established between L004 and L005.
(6) J006: L006 is fixed with the ground to construct a slider.
(7) J007: Compression cam 1 and follower swing roller definition line on line (CurveonCurve).
(8) j008: The bearing sleeve and the upper left support base roller define line on the line.
(9) J009: The bearing sleeve and the left lower support roller define the line on the line.
(10) G001: 3D Contact with pincers and pawl construction.
(11) D001: The swing arm movement pair J003 defines Damper.
3.3 Define Motion Drive
(1) The J001's motion drive selects constant speed and the speed is set to 1(°)/s.
(2) J009's motion drive selects constant speed, and all motion parameters are set to 0. This motion pair is mainly used to set the marker.
4 Center distance between rollers
Construct marking points A001, A002, A003 at the center of the blanket cylinder, plate cylinder, and impression cylinder, enter the measurement function of the packing option (PackingOption), select the minimum distance (MinimumDistance) type, set the measurement Me001 (rubber cylinder and seal) The center distance of the platen is marked A001 and A002, and MeO02 (the center distance between the blanket and the platen) is A001 and A003. Run motion simulation and set both Time and Steps to 360. After the simulation is complete, click List Measurements. The resulting data is plotted as shown in Figure 5(a). As can be seen from Figure 5 (a), when the pressure cam to 237 °, the completion of the pressure action, this time between the rubber roller and plate cylinder center distance Rr-p is 220.896mm, the center between the blanket and the impression roller Rr-i is 220.908mm. The above measurement value is the value when the eccentric position on the eccentric shaft is away from the corresponding drum, that is, the value when the eccentric position is 0°. The assembly angle of the eccentric shaft and the roller seat in the support seat part is changed to 180°, the position of the roller is changed, and the movement simulation is re-executed. The center distance value between the corresponding rollers is shown in Fig. 5(b). From Fig. 5(b), it can be seen that when the cam is rotated to 235°, the closing operation is completed, the center distance between the blanket cylinder and the plate cylinder is 220.872 mm, and the center distance between the blanket cylinder and the impression cylinder is 219.126 mm. As mentioned above, simply changing the assembly parameters of the corresponding components and parts in the assembly master model will automatically link to the motion simulation in the motion master model to obtain the corresponding values. This is unmatched by several other analysis methods. .
5 Conclusion
The UG software was used to model the offset press mechanism of the offset press, and the creation process of the link and the motion pair during kinematics simulation was described. Using UG's motion analysis module to analyze the center distance between the rollers of the clutch press mechanism, the required results were obtained. Compared with other analysis methods, it is simple, intuitive, less work, and easy to modify. Analysis of this type of institution provides an effective method.
1 "Three-point support" type clutch pressure mechanism
"Three-point support" from the pressure mechanism diagram [3 see Figure 1. The working principle is to achieve the separation and contact between the rollers by changing the center distance between the blanket cylinder 12 and the plate cylinder 13 and between the blanket cylinder and the impression cylinder 1O. In Figure 1, the plate cylinder axis o and the impression cylinder axis o. By installing the rolling bearing in the wall plate hole, the axial position of the roller shaft remains unchanged. The rubber roller shaft o is mounted in a roller bearing, and the roller bearing is mounted in the hole of the bearing sleeve 15. The bearing sleeve is supported by two fixed support roller members 14, 16 and a floating support roller member 11 to determine its center position. Because the outer contour of the bearing sleeve is designed as a special contour curve, when the bearing sleeve rotates along the support roller, the position of the axis of the rubber roller shaft changes, and the purpose of changing the center distance between the rollers is achieved. When the pressure is combined, the pressure cam and linkage mechanism drives the bearing sleeve to rotate counterclockwise so that the blanket cylinder is in contact with the plate cylinder and the impression cylinder in sequence. The process of pressure is the opposite.
From the above knowledge, the change in the center distance between the rollers is mainly caused by the change in the center position of the bearing sleeve, so that the positions of the shafts of the bearings and the rubber roller shafts installed in the holes thereof are changed. The change in the center distance between the rollers is mainly determined by the outer contour of the bearing sleeve. When the machine needs to be debugged or when the thickness of the printed paper changes, the center distance can also be fine-tuned by turning the eccentric shaft on the support roller. FIG. 2 is a schematic diagram of a structure of a support base roller member supporting a bearing sleeve, which is mainly composed of an eccentric shaft, a roller seat, a roller, and a bushing. In Figure 2, O1 is the center of rotation of the eccentric shaft, O2 is the center of the eccentric shaft and roller, and O3 is the center of the hole on the eccentric shaft. The roller seat is connected with the wall plate, and the eccentric shaft is rotated. The roller changes position with the rotation of the eccentric shaft and plays a role of radial adjustment. Assuming that the eccentricity O1O2 is a, the radial adjustment range of the roller is 0 to 2a.
2 Part modeling and assembly of the clutch and pressure mechanism
Run the UG software and enter the Modeling module to perform solid modeling of the parts. The cam and bearing sleeve in the mechanism are all discrete coordinate values. The data points can be generated from the coordinate points of the part. The Spline/Throughpoints/PointsfromFile command can be used to read the data file, draw the outline, and generate the trace by the Extrude command. , Compression cam and bearing cover parts. Figure 3 shows the solid model of the pressure cam.
After constructing the solid model of the part, it enters the assembly module (Assemblies) to virtually assemble the zeros and parts of the combined pressure mechanism. The assembly model is shown in Figure 4. Because it is necessary to analyze the effect on the center-to-center distance between the rollers when the eccentric shafts of the support roller components (14 pieces, 16 pieces in FIG. 1) are located at different positions, the angle assembly parameters are set when the roller components of the support blocks are assembled. As shown in FIG. 2 , the side of the roller seat is set as the reference plane A, and the plane passing through the axis line of the eccentric shaft and passing through the circle center O1 and the circle center O3 is the reference plane B, and the angle pairing parameters are set on the face plane A and the plane B at the time of assembling. Set the eccentric position in Fig. 2 to be 0° away from the maximum position on the A surface. When the eccentric shaft 1 rotates counterclockwise around the roller seat 2 and the set angle is positive, the angle of the marking hole on the eccentric shaft turns to O3'. At 60°, when the eccentric position 02 is at the lowermost end, the angle value is 180°.
3 Create Motion Simulation
After simplification of the assembly master model, the motion simulation module (Motion Simulation) is entered. Creating motion simulations includes creating links, motion pairs, and defining motion drivers.
3.1 Create a link
Relevant parts of the CurveonCurveJoint (including cam, cam follower swinging roller, bearing sleeve, left upper support roller and left lower support roller) to construct auxiliary curves to ensure that the corresponding curve positions are coplanar in the assembly drawing. Add the constructed curves to the ReferenceSets of the respective parts. According to the kinematic relationship of the closing pressure mechanism, refer to the component names shown in Figure 1, and establish the links as follows:
(1) L001: Compression cam 1 and its contour construction curve.
(2) L002: swing rod 3, cam follower swinging roller construction curve, supporting teeth 4.
(3) L003: swing arm 7 and pawl 5.
(4) L004: Pull rod 9.
(5) L005: bearing sleeve 15 and its construction curve, rubber roller 12.
(6) L006: Plate cylinder 13, impression cylinder 1O.
3.2 Definition of motion pair, 3D Contact and Damper
According to the actual working conditions, the definition of sports vice is as follows:
(1) J001: L001 is fixed with the ground, and a revolute is constructed.
(2) J002: L002 is fixed with the ground and Cylindrica1 is constructed.
(3) J003: L003 is fixed with the ground, and a revolute is constructed.
(4) J004: L003 and L004 establish a universal joint motion (Universa1).
(5) J005: Revolute is established between L004 and L005.
(6) J006: L006 is fixed with the ground to construct a slider.
(7) J007: Compression cam 1 and follower swing roller definition line on line (CurveonCurve).
(8) j008: The bearing sleeve and the upper left support base roller define line on the line.
(9) J009: The bearing sleeve and the left lower support roller define the line on the line.
(10) G001: 3D Contact with pincers and pawl construction.
(11) D001: The swing arm movement pair J003 defines Damper.
3.3 Define Motion Drive
(1) The J001's motion drive selects constant speed and the speed is set to 1(°)/s.
(2) J009's motion drive selects constant speed, and all motion parameters are set to 0. This motion pair is mainly used to set the marker.
4 Center distance between rollers
Construct marking points A001, A002, A003 at the center of the blanket cylinder, plate cylinder, and impression cylinder, enter the measurement function of the packing option (PackingOption), select the minimum distance (MinimumDistance) type, set the measurement Me001 (rubber cylinder and seal) The center distance of the platen is marked A001 and A002, and MeO02 (the center distance between the blanket and the platen) is A001 and A003. Run motion simulation and set both Time and Steps to 360. After the simulation is complete, click List Measurements. The resulting data is plotted as shown in Figure 5(a). As can be seen from Figure 5 (a), when the pressure cam to 237 °, the completion of the pressure action, this time between the rubber roller and plate cylinder center distance Rr-p is 220.896mm, the center between the blanket and the impression roller Rr-i is 220.908mm. The above measurement value is the value when the eccentric position on the eccentric shaft is away from the corresponding drum, that is, the value when the eccentric position is 0°. The assembly angle of the eccentric shaft and the roller seat in the support seat part is changed to 180°, the position of the roller is changed, and the movement simulation is re-executed. The center distance value between the corresponding rollers is shown in Fig. 5(b). From Fig. 5(b), it can be seen that when the cam is rotated to 235°, the closing operation is completed, the center distance between the blanket cylinder and the plate cylinder is 220.872 mm, and the center distance between the blanket cylinder and the impression cylinder is 219.126 mm. As mentioned above, simply changing the assembly parameters of the corresponding components and parts in the assembly master model will automatically link to the motion simulation in the motion master model to obtain the corresponding values. This is unmatched by several other analysis methods. .
5 Conclusion
The UG software was used to model the offset press mechanism of the offset press, and the creation process of the link and the motion pair during kinematics simulation was described. Using UG's motion analysis module to analyze the center distance between the rollers of the clutch press mechanism, the required results were obtained. Compared with other analysis methods, it is simple, intuitive, less work, and easy to modify. Analysis of this type of institution provides an effective method.
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