German BENZ workholding fixtures BENZ model BENZ price

BENZ workholding fixtures are one of the actuators for vacuum equipment. Generally, using vacuum suction cups to grip products is the most economical method. Vacuum suction cups come in various types; rubber suction cups can operate at high temperatures, silicone rubber suction cups are very suitable for gripping products with rough surfaces, and polyurethane suction cups are highly durable. In addition, in actual production, if oil resistance is required for the suction cup, materials such as polyurethane, nitrile rubber, or vinyl-containing polymers can be considered for manufacturing the suction cup. Usually, to avoid scratching the surface of the product, it is best to choose bellows-type suction cups made of nitrile rubber or silicone rubber. The suction cup material is made of nitrile rubber, which has high tensile strength, and is therefore widely used in various vacuum holding devices.

BENZ workholding fixture classification

Fixture types can be classified according to usage characteristics as follows: (1) Universal general-purpose fixtures. Such as machine vises, chucks, suction cups, indexing heads, and rotary tables, which have great versatility and can adapt well to changes in machining processes and workpieces. Their structures are standardized, and their dimensions and specifications are serialized, with most becoming standard accessories for machine tools. (2) Special-purpose fixtures. Designed and manufactured specifically for the clamping needs of certain product parts in specific processes, with a single service object and strong specificity, generally designed by the product manufacturer. Common examples include lathe fixtures, milling fixtures, drill jigs (machine tools used to guide drills for drilling or reaming holes in workpieces), boring jigs (machine tools used to guide boring bars for boring holes in workpieces), and pallet fixtures (movable fixtures used on automated lines of modular machine tools). (3) Adjustable fixtures. Special-purpose fixtures whose elements can be replaced or adjusted. (4) Modular fixtures. Fixtures composed of standardized elements of different shapes, specifications, and uses, suitable for new product trial production, single-piece and small-batch production with frequent product changes, and temporary tasks. In addition to vises, chucks, indexing heads, and rotary tables, there is a more common type called tool holders. Generally speaking, when the term "tool fixture" appears, it mostly refers to the tool holder.

BENZ workholding fixture applications

A fixture is a process device used to quickly secure workpieces during machining, maintaining the correct relative positions between the machine tool, cutting tool, and workpiece. In other words, Workholding tooling fixtures are indispensable components in mechanical machining. Driven by the development of machine tool technology towards high speed, high efficiency, precision, composite processing, intelligence, and environmental protection, fixture technology is moving towards high precision, high efficiency, modularity, combinability, universality, and economy. Fixtures are also known as clamps. Broadly speaking, any device used to quickly, conveniently, and safely install workpieces in any process step can be called a fixture. Examples include welding fixtures, inspection fixtures, assembly fixtures, and machine tool fixtures. Among these, machine tool fixtures are the most common and are often simply referred to as fixtures. When machining workpieces on machine tools, to ensure that the workpiece surface meets the technical requirements specified in the drawings, such as dimensions, geometric shape, and mutual positional accuracy with other surfaces, the workpiece must be properly positioned (location) and firmly clamped (clamping) before machining. The application of machine tool fixtures helps ensure machining accuracy and stabilize product quality; improves labor productivity and reduces costs; improves working conditions and ensures safe production; and expands the process range of machine tools, achieving "multi-purpose use of one machine." A fixture typically consists of locating elements (to determine the correct position of the workpiece in the fixture), clamping devices, tool-setting and guiding elements (to determine the relative position between the tool and the workpiece or to guide the tool direction), indexing devices (to allow the workpiece to complete machining at several stations in one installation, including rotary indexing devices and linear motion indexing devices), connecting elements, and the fixture body (fixture base). Fixtures are also widely used in electronics manufacturers. To improve production efficiency and product quality, tooling fixtures are commonly used in the middle and later stages of production for functional testing or auxiliary assembly (capable of assembling fixed shapes and heights, etc.). Their actual applications in electronic manufacturing plants are very extensive. Since they are non-standard custom-made, the possibilities are limited only by imagination.

BENZ workholding fixture classification

1) Pneumatic suction type: Pneumatic suction robot end-effectors use the suction force generated by negative pressure inside the suction cup to hold and move workpieces. The suction cup creates negative pressure in a soft rubber or plastic bellows 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. 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 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 connect the vacuum pump to the suction cup via an electromagnetic control valve. When the control valve evacuates air, the air in the suction cup cavity is removed, creating 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 adsorption area of the suction cup and the degree of vacuum 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 requires a vacuum pump and airflow control system, resulting in higher costs. 2) Mechanical clamping type: Structure of a straight-bar dual-cylinder translational gripper. The gripper fingers are mounted on a straight bar equipped with finger mounting seats. When pressurized gas enters the rod chambers of the two single-acting dual cylinders, the two pistons move towards 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 and unloading assembly workstations.

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