Novel method for detecting collision interference in bent pipe machining process
A technology of interference detection and processing process, which is applied in the field of pipe processing and manufacturing, can solve problems such as low efficiency, poor reliability, and failure to meet the requirements of use, and achieve the effect of simplified calculation and real-time continuous detection
Pending Publication Date: 2022-05-13
NANJING UNIV OF TECH
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[0003] In order to solve the problems of low efficiency, poor reliability, and inability to meet the requirements of the existing technology for interference and collision detection methods in the process of pipe bending, the present invention provides a new method for detection of collision interference in the process of pipe bending
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[0026] Based on the 3D modeling software, the 3D model of the parts that may interfere may be established. In order to simplify the model, the parts that are unlikely to collide with the elbow in the interference experiment can be removed. The parts that can be removed include: parts without relative motion and Parts that can touch each other;
[0027] Put the bent pipe in the CNC machine tool for physical measurement, and obtain the bending angle C, rotation angle B, and feeding amount Y of the pipe material.
[0028] Use the space curve (that is, the centerline of the elbow) to describe the bent pipe after bending, such as figure 1 As shown, points O and P are the starting point and ending point before and after the elbow is formed, respectively.
[0029] During the forming process of the pipe, it goes through three stages of linear feeding, bending and space rotation, corresponding to three space transformation matrices A 1 、A 2 、A 3 , the coordinates of the starting po...
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The invention provides a novel elbow pipe machining process collision interference detection method which is characterized by comprising the following steps: simplifying the structure of a numerical control elbow pipe machine tool, and determining parts, possibly interfering with an elbow pipe, of the machine tool; process parameters of the bent pipe are obtained; establishing a same-dimension coordinate system, and determining a mathematical model of the elbow and the surface of the interference component; determining the value range of the mathematical model of the bent pipe, and solving the minimum distance of the mathematical models of the bent pipe; the minimum distance is compared with the outer radius of the bent pipe, if the minimum distance is larger than the outer radius of the bent pipe, it can be determined that the bent pipe is free of collision interference at the moment, and if the minimum distance is smaller than the outer radius of the bent pipe, interference occurs. According to the method, the problem of bent pipe detection interference is converted into the problem of solving the distance minimum value of the mathematical equation between the bent pipe and the surface of the machine tool, and compared with a traditional detection method, the calculated amount is simplified; the position coordinates of the bending starting point before and after machining are used for controlling the interference detection state of the bent pipe, and the bent pipe is continuously detected in real time in the forming process of the bent pipe.
Description
technical field [0001] The invention relates to the technical field of pipe material processing and manufacturing, in particular to a novel collision interference detection method in the pipe bending process. Background technique [0002] When the CNC pipe bending machine is processing complex pipes, the continuously formed complex space bends will present various postures, and there may be interference collisions between them and the ground and various parts of the machine tool, which will affect the feasibility of the pipe bending process. Therefore, it is necessary to carry out interference detection before bending pipe processing, so as to judge whether the bending pipe in each posture interferes with the ground, mold and machine tool, so as to optimize the processing technology of the bending pipe. At present, the general detection methods mainly include: Axis-Aligned Bounding Box AABBTree (Axis-Aligned Bounnding Box) method is the main bounding box detection method, an...
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Login to View More IPC IPC(8): B21C51/00B21D7/00B21D7/16
CPCB21C51/00B21D7/00B21D7/16
Inventor 王华王鹏飞
Owner NANJING UNIV OF TECH