German niebuhr fischer workpiece fixtures niebuhr fischer models niebuhr fischer prices

niebuhr fischer workpiece fixtures are electromagnetic chucks that secure the workpiece being machined by the suction force generated by the chuck body when the electromagnetic coil is energized. An electromagnetic chuck consists of several parts, including an iron core, coil, faceplate, and bracket. The electromagnet, composed of the coil and iron core, is the main part of the electromagnetic chuck. Electromagnetic chucks vary due to differences in design methods or materials used, and they are continuously developing and improving. Electromagnetic chucks were initially used on grinding machines to replace clamping plates and bolts for securing workpieces to be ground. Such electromagnetic chucks are relatively simple and can only secure flat workpieces. This is the traditional electromagnetic chuck, which has significant limitations in its application. With industrial development, the demand for electromagnetic tools from enterprises has grown, and the requirements have become higher, prompting a series of improvements to electromagnetic chucks to meet production needs.

niebuhr fischer workpiece fixture classification

Due to the different operating characteristics and structural forms of various machine tools, different requirements are correspondingly placed on the structure of the fixtures used. According to the machine tool used, fixtures can be divided into: lathe fixtures, milling machine fixtures, drilling machine fixtures, boring machine fixtures, grinding machine fixtures, gear machine tool fixtures, and other machine tool fixtures. Based on the clamping power source adopted by the fixture, they can be divided into: manual fixtures, pneumatic fixtures, hydraulic fixtures, pneumatic-hydraulic fixtures, electric fixtures, magnetic fixtures, and vacuum fixtures. Specialized classification includes general-purpose fixtures, special-purpose fixtures, general-purpose adjustable fixtures, group fixtures, modular fixtures, and pallet fixtures. A pallet fixture is a fixture used on automatic lines. This type of fixture not only serves to clamp the workpiece but also becomes integrated with the workpiece, moving from one station to the next along the automatic line for processing different operations.

niebuhr fischer workpiece 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 and modular fixtures. 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 increasingly improves, the precision requirements for fixtures must correspondingly increase. There are many structural types of precision fixtures, such as multi-tooth discs for precision indexing, with an indexing accuracy of up to ±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 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 to clamp workpieces on a milling machine 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 and automated fixtures on production lines and automatic lines, various fixtures for automatic workpiece loading and devices for automatic fixture changing have appeared on CNC machine tools, especially on 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, 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 degree of flexibility of fixtures, changing the non-disassemblable structure of special-purpose fixtures to a disassemblable structure, and developing adjustable fixture structures will be the main direction of current fixture development.

niebuhr fischer workpiece fixture classification

The mechanical gripping end-effectors applied in loading and unloading industrial robots are mostly two-finger grippers. If classified by finger motion, they can be divided into translational and rotational types. If classified by mechanical clamping method, they can be divided into external clamping and internal expansion types. If classified by mechanical structural characteristics, they can be divided into electric (electromagnetic), hydraulic, and pneumatic types, as well as their combinations. 1) Vacuum suction type: Vacuum suction robot end-effectors use the suction force generated by negative pressure inside the suction cup to pick up and move workpieces. The suction cup uses negative pressure formed in a bellows made of soft rubber or plastic to hold the workpiece. This type of robot end-effector is suitable for handling large, thin, low-rigidity metal or wooden sheets, paper, glass, and curved shells. Depending on the application, the end-effector can be made with single, double, multiple, or specially shaped suction cups. Methods for forming negative pressure include: squeeze-type suction cups, airflow negative pressure suction cups, and vacuum pump exhaust suction cups. Squeeze-type suction cups: Squeeze-exhaust suction cups rely on downward squeezing force to expel all air from the suction cup, creating a negative pressure state inside to hold the workpiece. They have advantages such as simple structure, light weight, and low cost. However, the suction force is not large, so they are mostly used for workpieces that are not too large in size, thin, and light. Airflow negative pressure suction cups: An airflow control valve injects compressed air from an air pump into a nozzle, forming a high-speed jet that removes air from the suction cup cavity, creating negative pressure inside to hold the object. If compressed air is available at the job site, using this type of suction cup is convenient and low-cost. Vacuum pump exhaust suction cups: Vacuum pump exhaust suction cups use an electromagnetic control valve to connect the vacuum pump to the suction cup. When the control valve evacuates air, the air inside the suction cup cavity is removed, forming negative pressure to hold the object. Conversely, when the control valve connects the suction cup to the atmosphere, the suction cup loses suction and releases the workpiece. The suction force of vacuum pump suction cups mainly depends on the size of the suction area and the vacuum level inside the q cavity (referring to the thinness of the air inside). This type of suction cup works reliably and provides greater suction force, but it requires a vacuum pump and an airflow control system, resulting in higher costs. 2) Mechanical clamping type: The structure of a straight-bar dual-cylinder translational gripper refers to the gripper fingers being installed on a straight bar equipped with finger mounting seats. When pressurized gas enters the rod-side chambers of the two single-acting dual cylinders, the two pistons move toward the center, clamping the workpiece; when no pressurized gas enters, springs push the two pistons outward, releasing the workpiece. To ensure synchronous movement of the two pistons, a flow divider valve is installed on the cylinder intake line. This type of end-effector is used in loading and unloading assembly workstations.

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