Multi-axis sensor on the robot arm creates new possibilities in production and QA
Today, single-arm robots are used for a wide variety of tasks. Precisely measuring the forces and torques that occur directly on the arm opens up many more possibilities. In assembly processes, for example, the measured values can be used to draw conclusions about the correct parts, their positioning and correct assembly. The specialists at burster have developed a six-axis force/torque sensor with a robot flange in accordance with DIN ISO 9049-1, which is simply mounted on the standard holder of the robot arm. (Fig. 1) The 8565 3D sensor with a diameter of 95 mm and a height of 60 mm can measure up to three forces and torques Fx/Fy/Fz and Mx/My/Mz simultaneously (Fig. 2). Although the individual values are not extrapolated as is often the case, each measured variable is recorded via a separate strain gauge. The respective values can be read out via commercially available measuring amplifiers with a non-linearity (20%-100%) of 0.1% of the final value. The measurement technology provider therefore also offers various solutions. Depending on the application, customised axis configurations are possible, from one to three axes and with or without torque measurement. The user therefore only buys what he actually needs. The measuring range is up to +-1 kN in the Fx and Fy directions and +-2 kN in the Fz direction, with a maximum torque of 50 Nm in all directions. The special internal geometry of the sensor ensures low crosstalk between the individual axes. Sensors for other measuring ranges are in preparation.
New ways of working possible
Depending on the sensor version, new fields of work can be opened up for the robots or quality assurance measures can be implemented inline. For example, the relevant forces and torques can be measured during the loading of tool carriers and compared with default values. This enables good/bad statements to be made and prevents damage. The torques occurring during other tactile motion sequences such as gripping, milling or slicing etc. also provide direct information about the condition of the workpiece or the tool used. Adjustments through various reference measurements, e.g. of the friction between the workpiece and tool depending on the contact pressure (Fx/Fy in relation to Fz), can also improve the work result, e.g. during polishing. As a separate measuring amplifier is used for each channel, the individual values can be recorded and evaluated largely independently; this means that no cost-intensive multi-channel amplifier with correction calculation is required to record the individual channels, which significantly simplifies the setup.
Information on the images:
Image 1: Direct force measurement creates new possibilities for production, installation and quality assurance. (Author: burster)
Image 2: The scalable 8565 3D sensor can output measured values for up to three forces and torques (Fx/Fy/Fz and Mx/My/Mz). (Author: burster)
Company box: About burster
Whether individual metrological components or system solutions, burster focuses on supplying users in mechanical and plant engineering, automation, automotive engineering with suppliers, electrical engineering, electronics and the chemical industry. The portfolio includes measuring and testing devices as well as standard sensors for mechanical and electrical measured variables, such as force, compression, torque and displacement sensors and milli and megohmmeters or resistance decades. Individual, customised OEM solutions are also possible, e.g. for many other industries and future markets such as medical technology, biotechnology and e-mobility. Our many years of experience in the construction of measuring devices and sensors always guarantees optimal solutions. Sensors, amplifier and transmitter modules, precision measuring devices and measuring systems for sensor signal processing are supplied to customers all over the world from the development and production site in Germany.
Meta description:
Force/torque sensor for x/y/z axis with robot flange allows precisely controlled handling and quality control.