cornat fixtures Germany cornat models cornat prices

cornat fixtures refer to devices used in the mechanical manufacturing process to secure workpieces in the correct position for machining or inspection, also known as jigs. Broadly speaking, any device used to quickly, conveniently, and safely mount workpieces during any stage of the process can be called a fixture. Fixtures typically consist of locating elements (to determine the correct position of the workpiece within the fixture), clamping devices, tool-setting guide elements (to determine the relative position of the tool to the workpiece or guide the tool direction), indexing devices (enabling the workpiece to undergo machining at several stations in a single setup, including rotary indexing devices and linear indexing devices), connecting elements, and fixture bodies (fixture bases). Examples include welding fixtures, inspection fixtures, assembly fixtures, and machine tool fixtures, among which 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 technical requirements such as dimensions, geometric shape, and mutual positional accuracy with other surfaces as specified in the drawings, the workpiece must be properly located (positioning) and securely clamped (clamping) before machining.

cornat fixture types

1) Standard rectangular electromagnetic chucks Application: Surface grinding machines with rectangular tables. 2) High-power electromagnetic chucks Application: Milling machines, planing machines, machining centers. 3) Fine-pole electromagnetic chucks Application: Surface grinding machines with rectangular tables, milling machines. 4) Multi-function high-power electromagnetic chucks Application: Surface grinding machines with rectangular tables. 5) Rotary electromagnetic chucks Application: Various surface grinding machines. 6) Electromagnetic chucks for tool grinding Application: Tool grinding machines. 7) Circular electromagnetic chucks (concentric type) Application: Surface grinding machines with circular tables. 8) Circular electromagnetic chucks (radial pole type) Application: Surface grinding machines with circular tables. 9) Circular electromagnetic chucks (flower pole type) Application: Surface grinding machines with circular tables. An electromagnetic chuck is an electromagnetic fixture that secures the workpiece using the magnetic force generated by the chuck body when the electromagnetic coil is energized. An electromagnetic chuck consists of an iron core, coil, faceplate, and bracket. The electromagnet, composed of the coil and iron core, is the main part of the electromagnetic chuck.

cornat fixture classification

1) General-purpose fixtures: General-purpose fixtures are standardized fixtures that can be used to machine different workpieces within a certain range. For example, three-jaw chucks and four-jaw independent chucks on lathes, vise grips, indexing heads, and rotary tables on milling machines. These fixtures are generally produced by specialized factories and are often supplied to users as machine tool accessories. They are characterized by wide adaptability and low production efficiency, mainly suitable for single-piece and small-batch production. 2) Special-purpose fixtures: Special-purpose fixtures are designed specifically for a particular operation on a specific workpiece. They are characterized by compact structure, rapid, convenient, and labor-saving operation, ensuring high machining precision and production efficiency. However, the design and manufacturing cycle is long, and manufacturing costs are high. When the product changes, the fixture becomes obsolete and is scrapped. They are only suitable for production with fixed products and large batches. 3) Universal adjustable fixtures and group fixtures: Their characteristic is that some components of the fixture can be replaced and some devices adjusted to accommodate the machining of different parts. Fixtures used for group machining of similar parts are called group fixtures. Compared to group fixtures, universal adjustable fixtures have less defined machining objects and a wider scope of application. 4) Modular fixtures: Modular fixtures are assembled from a set of pre-manufactured standard components and parts according to the machining requirements of the part. Manufactured by professional manufacturers, they are characterized by flexibility, strong versatility, short manufacturing cycles, and reusable components, making them particularly suitable for new product prototyping and single-piece small-batch production. 5) Pallet fixtures: Pallet fixtures are used in automated lines. This type of fixture not only serves to clamp the workpiece but also moves as one unit with the workpiece along the automated line from one station to the next for different machining operations.

cornat fixture classification

Mechanical gripping end-effectors used in loading and unloading industrial robots are mostly two-finger grippers. 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 their combinations. 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 workpieces. The suction cup creates negative pressure 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 configured 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 suction 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. This type is convenient and low-cost if compressed air is available at the job site. 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, negative pressure forms inside the suction cup cavity 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 inside the q cavity (referring to the rarefaction of air inside the q cavity). This type of suction cup is reliable and provides strong suction, but requires a vacuum pump and airflow control system, resulting in higher costs. 2) Mechanical clamping type: The structure of a straight-bar dual-cylinder translational gripper refers to a gripper where the fingertips are mounted on a straight bar with fingertip mounts. When pressurized gas enters the rod-side chambers of the two single-acting dual cylinders, the two pistons move inward to clamp the workpiece; when no pressurized gas enters, springs push the two pistons outward to release the workpiece. A flow divider valve is installed in the cylinder intake line to ensure synchronous movement of the two pistons. This type of end-effector is used in loading and unloading assembly workstations.

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