German ROSTA workholding fixtures ROSTA model ROSTA price

ROSTA workholding fixtures are any tools with specific functions connected to the edge (joint) of a robot. This may include robot grippers, robot tool changers, robot collision sensors, robot rotary connectors, robot force tools, compliance devices, robot spray guns, robot deburring tools, robot arc welding torches, robot electric welding torches, etc. Robot end-effectors are generally considered peripheral equipment, accessories, tools, or arm-end tools (EOA) of the robot. Key elements: mechanism type, gripping method, gripping force, drive unit and control object characteristics, mass, shape, center of gravity position, dimensions, dimensional tolerances, surface condition, material, strength, operating parameters, operating space environment, operating accuracy, operating speed and acceleration, clamping time.

ROSTA workholding fixture requirements

Whether clamping or suction-type, robot end-effectors must also meet the repeatability precision required for the task. The structure of the robot end-effector should be as simple and compact as possible, with light weight, to reduce the load on the arm. Dedicated robot end-effectors have a simpler structure than general-purpose ones, but offer high work efficiency and can perform various tasks. In contrast, "universal" end-effectors may have disadvantages such as complex structures and high costs. Therefore, it is recommended to design and use serialized, standardized, dedicated robot end-effectors that can be quickly changed. If an object has two opposing flat surfaces, a double-jaw parallel gripper can be used to address dimensional deviation issues. For cylindrical objects, double-jaw grippers can also be used for clamping. Note that retaining or encompassing clamping requires less force.

ROSTA workholding fixture features

1) Standardization: Standardization and generalization of machine tool fixtures are two interrelated aspects. China already has national standards for fixture parts and components: GB/T2148~T2259－91, as well as standards for various general-purpose fixtures and modular fixtures. Standardization of machine tool fixtures facilitates commercial production of fixtures, helps shorten production preparation cycles, and reduces total production costs. 2) Precision: As the precision of mechanical products continues to improve, the precision requirements for fixtures inevitably increase accordingly. There are many types of precision fixture structures, such as multi-tooth discs for precision indexing, with an indexing precision of up to ±0.1"; and high-precision three-jaw self-centering chucks for precision turning, with a centering precision of 5μm. 3) High efficiency: High-efficiency fixtures are mainly used to reduce the basic and auxiliary time of workpiece machining, thereby improving labor productivity and reducing workers' labor intensity. Common high-efficiency fixtures include automated fixtures, high-speed fixtures, and fixtures with clamping force devices. For example, using an electric vise to clamp workpieces on a milling machine can increase efficiency by approximately 5 times; using a high-speed three-jaw self-centering chuck on a lathe ensures that the jaws can still firmly clamp the workpiece at a test speed of 9000r/min, thereby significantly increasing the cutting speed. In addition to configuring corresponding high-efficiency and automated fixtures in production lines and automatic lines, various fixtures for automatic workpiece clamping and devices for automatic fixture changing have appeared on CNC machine tools, especially machining centers, fully leveraging the efficiency of CNC machine tools. 4) Flexibility: The flexibility of machine tool fixtures is similar to that of machine tools. It refers to the ability of machine tool fixtures to adapt to variable process factors through adjustment, combination, and other methods. The main variable process factors include: operation characteristics, production batch size, workpiece shape and dimensions, etc. New types of fixtures with flexibility characteristics mainly include: modular fixtures, general-purpose adjustable fixtures, group fixtures, modular fixtures, and CNC fixtures. To meet the needs of modern mechanical industry for multi-variety, small-to-medium batch production, expanding the degree of flexibility of fixtures, changing the non-detachable structure of dedicated fixtures to detachable structures, and developing adjustable fixture structures will be the main direction of current fixture development.

ROSTA workholding fixture applications

1) Can stably ensure workpiece machining precision: When clamping workpieces with fixtures, the positional precision of the workpiece relative to the tool and machine tool is guaranteed by the fixture, unaffected by the worker's skill level, making the machining precision of a batch of workpieces consistent. 2) Can reduce auxiliary time and improve labor productivity: Using fixtures to clamp workpieces is convenient and fast; workpieces do not need marking and alignment, significantly reducing auxiliary time; after clamping in the fixture, the rigidity of the workpiece is improved, allowing for increased cutting amounts; fixtures for clamping multiple workpieces or multi-station workpieces can be used, and high-efficiency clamping mechanisms can be adopted to further improve labor productivity. 3) Can expand the usage range of machine tools and achieve multi-functionality: According to the forming motion of the machining machine tool, attaching different types of fixtures can expand the original process range of the machine tool. For example, installing a boring template on the carriage of a lathe or the table of a radial drilling machine allows for boring processing of box parts. 4) Ensure machining precision: Using fixtures for installation can accurately determine the mutual position between the workpiece and the machine tool/tool. The positional precision of the workpiece is guaranteed by the fixture, unaffected by the worker's skill level, resulting in high and stable machining precision. 5) Improve productivity and reduce costs: Clamping workpieces with fixtures allows for rapid positioning and clamping without alignment, significantly reducing auxiliary time; clamping workpieces with fixtures improves workpiece rigidity, thus allowing for increased cutting amounts; fixtures for clamping multiple workpieces or multi-station workpieces can be used, and high-efficiency clamping mechanisms can be adopted. These factors all contribute to improving labor productivity. In addition, using fixtures stabilizes product quality, reduces scrap rates, allows for the assignment of workers with lower skill levels, and significantly reduces production costs. 6) Expand the process range of machine tools: Using dedicated fixtures can change the original purpose of the machine tool and expand its usage range, achieving multi-functionality. For example, after installing boring template fixtures on lathes or radial drilling machines, boring processing of hole systems in box parts can be performed; dedicated fixtures can also convert lathes into broaching machines, fully leveraging the role of general-purpose machine tools. 7) Reduce workers' labor intensity: Clamping workpieces with fixtures is convenient and fast. When using pneumatic, hydraulic, or other clamping devices, workers' labor intensity can be reduced.

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