German Gimatic workholding fixtures Gimatic model Gimatic price

Gimatic workholding fixture is an electromagnetic chuck that secures the workpiece by the suction force generated by the chuck body when the electromagnetic coil is energized. The electromagnetic chuck consists of several parts, including a core, coil, faceplate, and bracket. The electromagnet, composed of the coil and 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. Initially, electromagnetic chucks were 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.

Gimatic workholding fixture classification

1) Lathe fixtures: Fixtures used on lathes to machine internal and external rotary surfaces and end faces of workpieces are called lathe fixtures. Most lathe fixtures are installed on the spindle, while a few are installed on the saddle or bed. 2) Coordinate measuring machine (CMM) fixtures: Used on CMMs, utilizing modular support and reference devices to achieve flexible fixation of the measured workpiece. This device allows automatic programming to support the workpiece and establish unlimited workpiece configuration reference points. Advanced dedicated software can directly generate workpiece clamping programs within seconds based on the geometric data of the workpiece. 3) Industrial robot fixtures: Installed on industrial robots for use in industrial automation equipment, representing one of the new technologies in modern industrial automation. They mainly appear in modern industrial production in coordination with robots, with common applications in automated unmanned factories for machine tool loading/unloading, workpiece palletizing/depalletizing, welding, and grinding. 4) Milling machine fixtures: Installed on the milling machine table, moving with the table feed motion. They mainly consist of positioning devices, clamping devices, fixture bodies, connecting elements, and tool-setting elements. During milling, cutting forces are large, and cutting is intermittent with significant vibration; therefore, milling machine fixtures require high clamping force, stiffness, and strength. 5) Bearing housing fixtures: To ensure and improve the production quality of bearing housings, in addition to machine tools and other mechanical equipment, a large amount of process equipment is used, including bearing housing fixtures, molds, cutting tools, and related auxiliary tools. Bearing housing fixtures are specialized production tools designed to ensure product quality, making the bearing housing production process more convenient. Different bearing housing fixtures vary in structure, form, operating conditions, and design principles, resulting in a wide variety of types and styles, accounting for a significant proportion in both quantity and variety. These fixtures accurately determine the relative position between the workpiece and the tool, allowing the workpiece to be clamped securely to perform the necessary motions during machining. Since bearing housing fixtures play a crucial role in the production process, drawing their design diagrams is also very important.

Gimatic workholding fixture features

1) Standardization: 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. Standardization of machine tool fixtures facilitates commercial production, shortens production preparation cycles, and reduces total production costs. 2) Precision: As the precision of mechanical products increases, the precision requirements for fixtures inevitably rise. There are many structural types of precision fixtures, such as multi-tooth discs for precision indexing, with an indexing accuracy of ±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 basic and auxiliary machining time, thereby increasing labor productivity and reducing worker labor intensity. Common high-efficiency fixtures include automated fixtures, high-speed fixtures, and fixtures with clamping force devices. For example, using electric vises on milling machines to clamp workpieces can increase efficiency by approximately 5 times; using high-speed three-jaw self-centering chucks on lathes ensures that the jaws firmly clamp the workpiece even at a test speed of 9000r/min, significantly increasing cutting speed. In addition to configuring corresponding high-efficiency and automated fixtures in production lines and automatic lines, various automatic workpiece clamping fixtures and automatic fixture changing devices have appeared on CNC machine tools, 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, referring to the ability of fixtures to adapt to variable process factors through adjustment and combination. Variable process factors mainly include operation characteristics, production batch size, and workpiece shape and dimensions. New types of fixtures with flexibility features 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 flexibility of fixtures, changing non-detachable structures of special fixtures to detachable structures, and developing adjustable fixture structures will be the main direction of fixture development.

Gimatic workholding fixture selection and usage

With the continuous development of China's industry, electromagnetic chucks are increasingly widely used in industrial production. The most important aspect of an electromagnetic chuck is its parameters; among the performance parameters, the lifting capacity and its working class are the most critical. The so-called lifting capacity of an electromagnetic chuck refers to the maximum weight of the load allowed to be lifted under specified operating conditions, also known as the rated lifting capacity. Generally, for cranes equipped with an electromagnetic chuck, the lifting capacity should also include the weight of the electromagnetic chuck itself. Rectangular electromagnetic chucks have lifting screw holes on both sides. During installation, T-shaped screws can be screwed in for lifting. They are fixed to the workbench using T-shaped blocks and screws. Connect the DC power supply and ground wire from the machine tool, then precision grind the upper surface of the chuck once to ensure the parallelism between the upper surface and the bottom surface. When clamping workpieces, sufficient positioning holding force can be obtained by bridging two adjacent magnetic poles, allowing grinding operations to proceed. Magnetization and demagnetization of the workpiece can be controlled via the machine tool buttons.

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