German demgen workpiece fixtures demgen model demgen price

demgen workpiece fixtures refer to devices used in the mechanical manufacturing process to secure the workpiece, ensuring it occupies the correct position for machining or inspection; they are also known as clamps. Broadly speaking, any device used to quickly, conveniently, and safely install a workpiece during any step 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 and guiding elements (to determine the relative position between the tool and the workpiece or to 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 a workpiece on a machine tool, to ensure that the surface of the workpiece meets the technical requirements specified in the drawing, such as dimensions, geometric shape, and mutual positional accuracy with other surfaces, the workpiece must be properly located (positioning) and securely clamped (clamping) before machining.

demgen workpiece fixture structure

1) Locating elements: These contact the locating reference of the workpiece to determine its correct position within the fixture, thereby ensuring the correct relative position between the workpiece and the tool as well as the machine tool's machining motion during processing. 2) Clamping devices: Used to clamp the workpiece, keeping it in the established position within the fixture during cutting. As shown in Figure 6-1, this includes the nut 5 and the slotted 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, and milling machine fixtures may 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 clamping devices, as they are key to ensuring the machining accuracy of the workpiece, with the aim of positioning the workpiece accurately and clamping it firmly.

demgen workpiece fixture features

Workpieces produced in small batches with high variety already account for approximately 85% of the total number of workpiece types. Modern production requires companies to frequently update their product varieties to adapt to market demands and competition. However, most companies are still accustomed to extensively using traditional special-purpose fixtures. Generally, factories with medium production capacity own thousands to nearly ten thousand sets of special-purpose fixtures. On the other hand, in companies with high-variety production, approximately 50~80% of special-purpose fixtures need to be updated every 3~4 years, while the actual wear of the fixtures is only about 10~20%. To meet the application of new machining technologies such as CNC machine tools, machining centers, group technology, and Flexible Manufacturing Systems (FMS), machine tool fixtures have the following characteristics: 1) They can quickly and conveniently equip new products for production, shortening the production preparation cycle and reducing production costs; 2) They can clamp a group of workpieces with similar characteristics; 3) They can serve as high-precision machine tool fixtures suitable for precision machining; 4) They can serve as new types of machine tool fixtures suitable for various modern manufacturing technologies; 5) They adopt efficient clamping devices powered by hydraulic stations and other sources to further reduce labor intensity and improve labor productivity; 6) They improve the standardization level of machine tool fixtures. This is mainly reflected in four aspects: standardization, precision, efficiency, and flexibility.

demgen workpiece fixture applications

1) Stable assurance of workpiece machining accuracy: When clamping a workpiece with a fixture, the positional accuracy of the workpiece relative to the tool and the machine tool is guaranteed by the fixture, unaffected by the worker's skill level, ensuring consistent machining accuracy for a batch of workpieces. 2) Reduction of auxiliary time and improvement of labor productivity: Using fixtures makes workpiece clamping convenient and fast; workpieces do not require scribing and alignment, significantly reducing auxiliary time. Clamping workpieces in fixtures increases their rigidity, allowing for increased cutting amounts. Fixtures capable of clamping multiple workpieces or at multiple stations can be used, along with efficient clamping mechanisms, to further improve labor productivity. 3) Expansion of machine tool usage range, achieving multi-functionality: By attaching different types of fixtures according to the forming motion of the machining machine tool, the original process range of the machine tool can be expanded. For example, installing a boring template on the carriage of a lathe or the table of a radial drilling machine allows for boring processing of box-type parts. 4) Assurance of machining accuracy: Using fixtures for installation allows for accurate determination of the mutual positions between the workpiece, the machine tool, and the tool. The positional accuracy of the workpiece is guaranteed by the fixture, unaffected by the worker's skill level, resulting in high and stable machining accuracy. 5) Increased productivity and reduced costs: Clamping workpieces with fixtures allows for rapid positioning and clamping without alignment, significantly reducing auxiliary time. Clamping workpieces in fixtures increases their rigidity, allowing for increased cutting amounts. The use of fixtures for clamping multiple workpieces or at multiple stations, along with efficient clamping mechanisms, contributes to higher labor productivity. Additionally, the use of fixtures stabilizes product quality, reduces the scrap rate, allows for the assignment of workers with lower technical grades, and significantly lowers production costs. 6) Expansion of the machine tool's process range: Using special-purpose fixtures can change the original purpose of the machine tool and expand its usage range, achieving multi-functionality. For example, after installing boring template fixtures on a lathe or radial drilling machine, boring processing of hole systems in box-type parts can be performed. Special-purpose fixtures can also convert a lathe for use as a broaching machine, fully leveraging the capabilities of general-purpose machine tools. 7) Reduction of workers' labor intensity: Clamping workpieces with fixtures is convenient and fast. When using pneumatic, hydraulic, or other clamping devices, workers' labor intensity can be reduced.

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