German BUHL workpiece fixtures BUHL models BUHL prices

BUHL workpiece fixtures are devices that hold objects to manipulate them. They can grip and release objects while performing certain actions. Motion devices often mimic human movements; in the case of grippers, they mimic finger movements. The "fingers" themselves are not part of the gripper; they are specialized custom tools for holding objects, called "jaws." Two main gripping actions: External gripping: This is the most common method for holding objects. It is the simplest and requires the shortest stroke length. When the gripper jaws close, the clamping force applied by the gripper holds the object. Internal gripping: In some applications, due to the geometry of the object or the need to access the exterior of the object, it is necessary to grip the object from the center. In this case, the gripper holds the object through expansion force.

BUHL workpiece fixture requirements

Whether clamping or suction-based, robot end-effectors must have the repeatability required for the task. The structure of the robot end-effector should be as simple and compact as possible, and lightweight, to reduce the load on the arm. Specialized robot end-effectors have a simpler structure than general-purpose ones, 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, specialized robot end-effectors that can be quickly changed. If an object has two opposing flat surfaces, a parallel two-jaw gripper can be used to address dimensional deviation issues. For cylindrical objects, a two-jaw gripper can also be used for holding. Note that containment or enveloping grips require less force.

BUHL workpiece 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. There are many types of precision fixture structures, such as multi-tooth discs for precise indexing, with an indexing accuracy of ±0.1"; and high-precision three-jaw self-centering chucks for precision turning, with a centering accuracy of 5μm. 3) High efficiency: High-efficiency fixtures are mainly used to reduce the basic and auxiliary time for 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 firmly clamp the workpiece even at a test speed of 9000r/min, allowing a significant increase in cutting speed. In addition to configuring corresponding high-efficiency, 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 machines. 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, and the shape and dimensions of the workpiece. 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 flexibility of fixtures, changing the non-detachable structure of specialized fixtures to a detachable structure, and developing adjustable fixture structures will be the main direction of current fixture development.

BUHL workpiece fixture maintenance

When using vacuum suction cups (without clamps), note that the manipulator's movement speed should not be too high; otherwise, shear forces will be generated on the suction cup, causing the product to drop easily during rapid twisting. In some cases, a clamp can be used to ensure safe transport of the product. Considering the possibility of the product sticking to the mold, an air clamp is usually installed to solve this problem. When the product's surface area is too small or the product is too heavy for vacuum suction cups, clamps can also be used to solve this problem. If the product has strict appearance requirements, the clamped area must not be the outer surface. To solve this problem, a sensor circuit can be installed. After confirming that the clamp or suction cup has securely grasped the product, the sensor sends a signal to the manipulator to proceed to the next operation. In cases where the manipulator's motion capability is limited and manual twisting or prying is required to demold the product or move it out of the molding area, a special cylinder capable of independent movement, not relying on manipulator operation, can be added to improve this situation.

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