Tham khảo tài liệu 'grippers in motion - the fascination of automated handling tasks - wolf part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Getting To Grips With Handling Tasks 3 micro-components pick operation with adhesive grippers Grippers with switch-off switch-on contact surfaces are frequently being used in the form of suction grippers or magnetic grippers. These principles of function are easily integrated into single operating elements of grippers. The adhesive contact surface type is still a special force transmission type. Adhesive gripper technology is based on a physical principle which is based on the surface tension of liquids. Adhesion means joining together different bodies or in this case workpieces made of different materials. The cause of adhesion is molecular magnetism the so-called adhesive forces between the contact surfaces. gripper adhesive 1mm support plate 3. align 4. place Figure Adhesive gripping process source Bark Adhesive grippers have been developed for picking up micro components e. g. by using the surface tension of a liquid drop to pick and place a chip. An accurate drop size is supplied onto the gripper s underside and then slightly reduced during gripping . The most difficult part of adhesive gripping is releasing the workpiece. In order to precisely maintain its position a workpiece must already be in a position where a force can be built up to counteract the adhesive force of the gripper. In figure the gripper has already been provided with an adhesive. This counteracting force together with liquid reduction enable the workpiece to remain in the desired position. A gripper can also place workpieces with the help of an active release mechanism. Liquids are often volatile substances e. g. alcohol which do not leave any trace on the workpiece. 102 Adhesion may occur due to unwanted adhesive forces between two different materials. In general these forces are neglectable and do not influence the gripping process in the macro range. However adhesive forces may become critical when handling very small or delicate workpieces. Place operation in .
