German buna workholding fixtures buna model buna price

buna workholding fixtures are devices used in the manufacturing process to secure the workpiece, ensuring it occupies the correct position for machining or inspection; they are also known as jigs. 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 the surface 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.

buna workholding 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 workpiece's machining requirements, 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 workpiece machining accuracy, with the aim of positioning the workpiece accurately and clamping it securely.

buna workholding 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 meet market demands and competition. However, most companies are still accustomed to extensively using traditional dedicated fixtures. Generally, factories with medium production capacity own thousands or even nearly ten thousand sets of dedicated fixtures. On the other hand, in companies with high-variety production, approximately 50~80% of dedicated 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 power 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.

buna workholding fixture maintenance

1) Before use, check whether the limit dimensions remain in the correct position. 2) If the stop pin wear exceeds tolerances, it can be repaired by grinding; if the baffle, pin, or locating tapered pin wear exceeds tolerances, they can be reassembled, shifting the worn areas to allow continued use. 3) Apply anti-rust oil after use. Regular long-term lubrication maintains the service life of synchronous fixtures; incorrect lubrication will lead to reduced clamping force, poor accuracy, wear, and seizing, so proper lubrication is essential. After machining, be sure to clean the body and slide ways of the synchronous fixture using an air gun or similar tools. During cleaning, remove the dust cover fixing screws and take off the dust cover, while opening the main jaws to their widest position to easily clean chip accumulation inside the fixture. To avoid reduced clamping force due to rust, use rust-preventive cutting oil. Remove the synchronous fixture for a thorough cleaning every six months (at least every two months when machining cast iron or copper parts). Check parts for damage or wear, and replace with new items immediately if severe. Lubricate thoroughly before assembly.

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