with the demand for flexible production of vehicle models, more and more platform vehicles need to be produced on the same line. Due to the limitation of space, the gripper also needs to be shared by multiple vehicles. Sharing the gripper often causes the payload to be overweight when using the same type of robot, and the selection of the robot has to be replaced. Use magnesium alloy pipe instead of steel pipe or aluminum pipe to reduce the weight of the gripper.
At present, octagonal pipe grippers are mainly made of aluminum alloy. Compared with aluminum alloy materials, the properties and characteristics of magnesium alloy pipe are as follows: 1. The material density is low, about 70% of the density of aluminum alloy pipe; The tensile strength is higher than that of aluminum alloy, the yield strength is equivalent to that of aluminum alloy, and the toughness is high; Good stress concentration, good fatigue resistance and impact resistance. Therefore, the aluminum alloy standard parts of octagonal tube grippers can be considered to be replaced with magnesium alloy materials at the stations with higher weight requirements.
An octagonal pipe grab has a length of 1284.11mm and a width of 304.54mm. It has 13 units and is mainly composed of standard aluminum alloy series connectors. The no-load weight of the gripper is 178kg, the part weight is 27kg, the actual load weight of the robot is 205KG, the limit load of the robot is 210kg, and the load is 98%, which is almost full load. Similar problems have a great impact on the life of the reducer of the robot. By replacing lightweight and high-strength magnesium alloy materials, weight reduction measures are implemented to reduce the load of the robot and reduce the impact on the life of the reducer under nearly full load; Avoid new investment caused by robot replacement.
After the replacement of lightweight materials, the weight of the gripper is effectively reduced by 20kg, and the robot payload is reduced from 205KG to 185kg, which can greatly reduce the mechanical loss during the operation of the robot, prolong the service life of the equipment, and reduce energy consumption. At the same time, compared with the original aluminum alloy grippers, the magnesium alloy grippers are basically consistent in deformation and better in stress. The actual use and tracking data show that the magnesium alloy gripper has good stability and meets the use requirements.
