German EFFBE workholding fixtures, EFFBE models, EFFBE pricing

EFFBE workholding fixtures are devices that grip objects to manipulate them. They can clamp and release objects while performing certain actions. Motion devices often mimic human movement; in the case of grippers, they mimic finger motion. The "fingers" themselves are not part of the gripper; they are specialized custom tools for holding objects, known as "jaws." Two main clamping actions: External clamping: 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 clamping: In some applications, due to the object's geometry or the need to access the exterior of the object, it is necessary to clamp the object from the center. In this case, the gripper holds the object through expansion force.

EFFBE workholding fixture structure

1) Locating elements: These contact the locating reference of the workpiece to determine its correct position in the fixture, thereby ensuring the correct relative position between the workpiece and the tool/machine tool motion during machining. 2) Clamping device: Used to clamp the workpiece, keeping it in the established position within the fixture during cutting. As shown in Figure 6-1, nut 5 and open washer. 3) Tool-setting and guiding elements or devices: These elements ensure the correct position between the workpiece and the tool. Elements used to determine the correct position of the tool before machining are called tool-setting elements, such as tool-setting blocks. Elements used to determine the tool position and guide the tool during machining are called guiding elements. 4) Connecting elements: Elements that connect the fixture to the machine tool, ensuring the mutual positional relationship between the machine tool and the fixture. 5) Fixture body: The base component used to connect or fix various elements and devices on the fixture into a single unit. It connects and aligns with relevant parts of the machine tool, giving the fixture a definite position relative to the machine tool. 6) Other elements and devices: Some fixtures require indexing mechanisms based on the machining requirements of the workpiece; milling machine fixtures also require locating keys, etc. Not all of these components are indispensable for every type of machine tool fixture, but any fixture must have locating elements and a clamping device. They are key to ensuring the machining accuracy of the workpiece, with the aim of accurately positioning and securely clamping the workpiece.

EFFBE workholding fixture technology

The electromagnetic chuck consists of a base housing, iron core, coil, faceplate, and junction box. Its manufacturing process is as follows: 1) Select suitable materials to weld or cast the base housing. 2) Install the iron core onto the base housing according to the type of chuck. 3) Wind the coil with the corresponding number of turns and technical parameters, dry it, and fit it onto the iron core. 4) Pour asphalt or other waterproofing material into the interior of the base housing. 5) Manufacture the faceplate and install it together with the base housing section. Electromagnetic chucks use DC power supply and feature stability, strong holding force, and low residual magnetism. Electromagnetic chucks can be classified into standard-holding chucks and high-power chucks. Standard-holding chucks have a holding force of 10-12 kg/cm², while high-power electromagnetic chucks have no less than 14 kg/cm². Based on application, they can be classified into electromagnetic chucks for grinders, electromagnetic chucks for milling and planing machines, electromagnetic chucks for knife grinders, etc.

EFFBE workholding fixture classification

Mechanical gripping end-effectors used in loading/unloading industrial robots are mostly two-finger claw types. Classified by finger motion, they can be divided into translational and rotary types. Classified by mechanical gripping method, they can be divided into external clamping and internal expanding types. Classified by mechanical structural characteristics, they can be divided into electric (electromagnetic), hydraulic, and pneumatic types, as well as combinations thereof. 1) Vacuum suction type: Vacuum suction robot end-effectors use the suction force generated by negative pressure inside the suction cup to hold and move the workpiece. 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 generating 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 expel all air from the cup by downward squeezing force, creating a negative pressure state inside to hold the workpiece. Advantages include 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 through a nozzle, forming a high-speed jet that removes air from the suction cup cavity, creating negative pressure 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 in 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 force and releases the workpiece. The suction force of vacuum pump suction cups mainly depends on the size of the suction area and the degree of vacuum in the inner wall of the suction cup (referring to the thinness of the air in the inner q cavity). This type of suction cup is reliable and has greater suction force, but requires a vacuum pump and airflow control system, resulting in higher costs. 2) Mechanical gripping type: Structure of a straight-bar dual-cylinder translational gripper. The gripper fingertips are installed on a straight bar equipped with fingertip mounts. 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 in the cylinder intake line. This type of end-effector is used in loading/unloading assembly workstations.

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