Peg-In-Hole Operation Using a Cobot Without Using External Sensors (original) (raw)

Robotic assembly : chamferless peg-hole assembly operation from X/Y/Z directions

2000

A great deal of research of the robotic peg-in hole assembly operation has evolved over the past decades. In the case of a chamfered peg-hole, it is normal to use a simple wrist such as the Remote Centre Compliance (RCC), which is fitted between the robot arm and the end effector to accommodate misalignments between the peg and the hole during the engagement stage. Otherwise jamming could occur and cause damage to the assembly robot and or the mating parts. However, in case of no chamfer on either of the mating parts, complicated and expensive devices are used to accommodate the same misalignments as the RCC. The objective of this research is to develop a new paSSIve assembly strategy and consequently a compliant wrist for the peg-hole insertion process. The wrist should adopt the passive technique as the RCC, but should accommodate positional errors even in case of no chamfer on either of the peg or the hole. Moreover, it should function from vertical as well as the horizontal dire...

Servoing Mechanisms for Peg-In-Hole Assembly Operations

Lecture Notes in Computer Science, 2001

Image-based effector servoing is a process of perception-action cycles for handling a robot effector under continual visual feedback. Apart from the primary goal of manipulating objects we apply servoing mechanisms also for determining camera features, e.g. the optical axes of cameras, and for actively changing the view, e.g. for inspecting the object shape. A peg-in-hole application is treated by a 6-DOF manipulator and a stereo camera head. The two robot components are mounted on separate platforms and can be steered independently. In the first phase (inspection phase), the robot hand carries an object into the field of view of one camera, then approaches the object along the optical axis to the camera, rotates the object for reaching an optimal view, and finally inspects the object shape in detail. In the second phase (insertion phase), the system localizes a board containing holes of different shapes, determines the relevant hole based on the extracted object shape, then approaches the object, and finally inserts it into the hole. At present, the robot system has the competence to handle cylindrical and cuboid pegs. For treating more complicated objects the system must be extended with more sophisticated strategies for the inspection and/or insertion phase.

Robotic assembly: chamferless peg-hole assembly

Robotica, 1999

The peg-in-hole insertion process is the most common task in the robotic/automatic assembly industry. However, the inaccuracy of the assembly robot in positioning the inserted peg into the hole due to the uncertainty of the assembly environment, represents an obstacle in this area of automation. To overcome this problem, complex and expensive equipment has been designed. The objective of this paper is to provide an in-depth understanding of the chamferless peg-hole assembly, by showing the geometrical, dynamical conditions for a successful assembly operation. Also, the results of this analysis have been simulated to demonstrate the chamferless peg-hole insertion process.

Analysis and synthesis of assistive tools for insertion tasks

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2021

This article studies two types of assembly tasks, namely snap-fit insertions and press-fit hose insertions. Experimental data and theoretical modelling of a snap-fit assembly are used to design a tool that can perform the snap-fit task effectively. The design process of the tool is presented and experimental tests developed to validate its effectiveness are described. Hose insertion experiments are then performed and the results are analyzed in order to develop strategies for the effective insertion of press-fit components in assembly tasks. A motion primitive strategy is first explored, followed by a vibration oriented strategy. Finally, a video demonstrating the experiments accompanies this paper.

IJERT-Design of Pick and Place Robot Test Rig

International Journal of Engineering Research and Technology (IJERT), 2013

https://www.ijert.org/design-of-pick-and-place-robot-test-rig https://www.ijert.org/research/design-of-pick-and-place-robot-test-rig-IJERTV2IS120625.pdf The industry is moving from current state of automation to Robotization, to increase productivity and to deliver uniform quality. The industrial robots of today may not look the least bit like a human being although all the research is directed to provide more and more anthropomorphic and humanlike features and superhuman capabilities in these. One type of robot commonly used in industry is a robotic manipulator or simply a robotic arm. It is an open or closed kinematic chain of rigid links interconnected by movable joints. In some configurations, links can be considered to correspond to human anatomy as waist, upper arm and forearm with joint at shoulder and elbow. At end of arm a wrist joint connects an end effector which may be a tool and its fixture or a gripper or any other device to work.

Robot Performing Peg-in-Hole Operations by Learning from Human Demonstration

2018 10th Computer Science and Electronic Engineering (CEEC), 2018

This paper presents a novel approach for a robot to conduct assembly tasks, namely robot learning from human demonstrations. The learning of robotic assembly task is divided into two phases: teaching and reproduction. During the teaching phase, a wrist camera is used to scan the object on the workbench and extract its SIFT feature. The human demonstrator teaches the robot to grasp the object from the effective position and orientation. During the reproduction phase, the robot uses the learned knowledge to reproduce the grasping manipulation autonomously. The robustness of the robotic assembly system is evaluated through a series of grasping trials. The dual-arm Baxter robot is used to perform the Peg-in-Hole task by using the proposed approach. Experimental results show that the robot is able to accomplish assembly task by learning from human demonstration without traditional dedicated programming.

Conception et développement de dispositifs pour les procédures d'insertion de l'aiguille robotisés

2014

Ces travaux de thèse apportent plusieurs contributions à la conception de dispositifs d'assistance robotisés pour la réalisation de procédures d'insertion d'aiguille sous imageur à rayons X. Partant de la tâche de positionnement et d'orientation d'une aiguille, plusieurs architectures mécaniques inédites à quatre degrés de liberté ont été proposées. Un algorithme de synthèse dimensionnelle a été conçu pour calculer les paramètres structuraux de ces mécanismes en étudiant leurs singularités, tout en tenant compte des contraintes antagonistes de compacité du système, de capacité d'actionnement et de taille d'espace de travail. Une décomposition modulaire du dispositif d'assistance a permis de proposer des solutions pour un outil dédié à l'insertion d'aiguille avec retour d'effort. Cet outil comporte un dispositif d'insertion, un système de préhension d'aiguille et un capteur d'effort spécifique pour le retour d'effort.This th...

Automated robot-based screw insertion system

IECON 98, 1998

This paper introduces an automated robot-based system for the insertion of self-tapping screws into unthreaded holes. The system consists of three main components: a manipulator-guided screwdriver, a camera and a system which controls and monitors the overall process. The focus of this paper is on the key stages of the insertion procedure: a) detection of the insertion location by means of a camera, b) positioning of the electrical screwdriver employing a manipulator, and c) appropriately monitored insertion of a screw. Experiments were carried out in order to identify the requirements needed for a fully automated insertion system. Results are presented.

Design and development of devices for robotized needle insertion procedures

Http Www Theses Fr, 2014

This thesis focuses on finding solutions for the design and the technological bottlenecks involving development of a slave robotic assistant for needle insertion procedures. The needed functionalities for the slave device were sought to be achieved by adopting a modular approach. This required the design and the development of different devices which satisfy targeted functionalities. A study of needle positioning devices was carried out which led to the synthesis of novel mechanisms for the task of needle axis translation and the needle axis orientation. A novel dimensional synthesis algorithm was developed to calculate the structural parameters of these mechanism while studying their singularities and considering the antagonistic constraints of system compactness, actuation torques and workspace size. The modular decomposition also allowed to offer solutions for an insertion tool dedicated to needle insertion with force feedback. This insertion tool consists of a device for inserting the needle, a device for grasping the needle and a force sensor for force feedback. Résumé Ces travaux de thèse apportent plusieurs contributions à la conception de dispositifs d'assistance robotisés pour la réalisation de procédures d'insertion d'aiguille sous imageur à rayons X. Partant de la tâche de positionnement et d'orientation d'une aiguille, plusieurs architectures mécaniques inédites à quatre degrés de liberté ont été proposées. Un algorithme de synthèse dimensionnelle a été conçu pour calculer les paramètres structuraux de ces mécanismes en étudiant leurs singularités, tout en tenant compte des contraintes antagonistes de compacité du système, de capacité d'actionnement et de taille d'espace de travail. Une décomposition modulaire du dispositif d'assistance a permis de proposer des solutions pour un outil dédié à l'insertion d'aiguille avec retour d'effort. Cet outil comporte un dispositif d'insertion, un système de préhension d'aiguille et un capteur d'effort spécifique pour le retour d'effort.