German ses workholding fixtures ses model ses price

ses workholding 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 do not belong to the gripper; they are merely 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 will hold 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 will hold the object through expansion force.

ses workholding fixture operating principle

The most widely used grippers are pneumatic grippers; they are essentially cylinders powered by compressed air. When air is supplied, the gripper jaws approach the object and grip it firmly to enable other operations, and when the air direction is reversed, the gripper releases the object. Typical applications include changing the orientation of an object or moving it during pick-and-place operations. When the gripper holds a workpiece, there should be certain force constraints and shape constraints to ensure that the clamped workpiece is fully released during movement, dwelling, and loading processes. Additionally, it should ensure that the geometric deviation of the workpiece's clamping posture remains within the specified tolerance zone.

ses workholding fixture features

1) Standardization: The 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, modular fixtures, etc. The 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 structural types of precision fixtures, such as multi-tooth discs for precise indexing, with an indexing accuracy of ±0.1"; 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 time 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 on a milling machine to clamp workpieces can improve 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, automated fixtures in production lines and automatic lines, various fixtures for automatic workpiece clamping and devices for automatic fixture change have appeared on CNC machines, 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, workpiece shape and dimensions, etc. New types of fixtures with flexible 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 and medium batch production, expanding the flexibility of fixtures, changing the non-detachable structure of special fixtures to a detachable structure, and developing adjustable fixture structures will be the main direction of current fixture development.

ses workholding fixture maintenance

1) Check before use whether the limit dimensions are still in the correct position. 2) If the stop pin wear exceeds tolerances, it can be repaired by grinding; if the baffle, pin, or positioning taper pin wear exceeds tolerances, they can be reassembled, offsetting the worn areas for continued use. 3) Apply anti-rust oil after use. Regular long-term lubrication can maintain the life of synchronous fixtures; incorrect lubrication will lead to reduced clamping force, poor precision, wear, and jamming, so proper lubrication is essential. After machining, be sure to clean the body and slide ways of the synchronous fixture with an air gun or similar tool. During cleaning, remove the dust cover fixing screws and take off the dust cover, while opening the main jaws to their widest position to easily clean chips accumulated inside the fixture. To avoid reduced clamping force due to rust, use rust-preventive cutting oil. Remove the synchronous fixture every six months for thorough cleaning (at least every two months when machining cast iron or copper products). Check parts for damage or wear, and replace with new ones immediately if severe. Lubricate thoroughly before assembly.

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