German TBT Tiefbohrtechnik workpiece fixtures, TBT Tiefbohrtechnik models, TBT Tiefbohrtechnik prices

TBT Tiefbohrtechnik workpiece fixtures are devices used in the manufacturing process to secure the workpiece in the correct position for machining or inspection, 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 in the fixture), clamping devices, tool-setting guide elements (to determine the relative position of the tool and workpiece or guide the tool direction), indexing devices (to enable the workpiece to undergo machining at several stations in a single setup, including rotary indexing devices and linear indexing devices), connecting elements, and the fixture body (fixture base). Examples include welding fixtures, inspection fixtures, assembly fixtures, and machine tool fixtures, with machine tool fixtures being the most common, 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 and securely clamped before machining.

TBT Tiefbohrtechnik workpiece fixture operating principle

The most widely used grippers are pneumatic grippers; they are essentially cylinders powered by compressed air. When air is supplied, the gripper jaws approach and firmly hold the object to perform other operations, and when the air direction is reversed, the gripper releases the object. Typical applications include changing the orientation of an object or moving it during pick-and-place operations. When the gripper holds a workpiece, there must be certain force constraints and form constraints to ensure that the clamped workpiece is fully released during movement, dwelling, and loading. In addition, it must ensure that the geometric deviation of the workpiece holding posture remains within the specified tolerance zone.

TBT Tiefbohrtechnik workpiece fixture features

Workpieces for small-batch, high-variety production 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. In factories with medium production capacity, there are typically thousands to nearly ten thousand sets of dedicated fixtures. On the other hand, in companies with high-variety production, approximately 50~80% of dedicated fixtures must 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 to shorten the production preparation cycle and reduce production costs; 2) They can clamp a group of workpieces with similar characteristics; 3) They can be used as high-precision machine tool fixtures suitable for precision machining; 4) They can be used 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) Improve the standardization level of machine tool fixtures. This is mainly reflected in four aspects: standardization, precision, efficiency, and flexibility.

TBT Tiefbohrtechnik workpiece fixture selection

When selecting pneumatic grippers and jaw designs, these are the main factors to consider: 1) Part shape, orientation, and size differences: If the object has two opposing flat surfaces, a parallel double-jaw gripper can be used to address size deviations. For cylindrical objects, a double-jaw gripper can also be used for clamping. Note that retaining or enclosing grips require less force. 2) Part weight: The clamping force must be sufficient to hold the object in place during the required operations. The type of jaw design must be considered when calculating the required clamping force. Please note that safety factors should be taken into account when selecting the required force, and air pressure is also a factor to consider. 3) Accessibility: This relates both to the operation being performed and the space available for the gripper jaws. If external operations are to be performed on the object, internal clamping is required. Scissor-type grippers are usually cheaper but require more space for jaw movement. 4) Environment: Grippers used in harsh environments or clean rooms need to have appropriate designs. 5) Object retention: When air supply stops, the gripper will release the object, causing it to drop. For such applications, spring-assisted grippers can be used.

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