German paatz workpiece fixtures paatz model paatz price

paatz workpiece 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 clamping tools. In a broad sense, 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 mechanisms, tool-setting guide elements (to determine the relative position between the tool and the workpiece or to guide the tool direction), indexing devices (to allow 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, 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 firmly clamped (clamping) before machining.

paatz workpiece fixture classification

1) Lathe fixtures: Fixtures used on lathes to machine the internal and external rotating surfaces and end faces of workpieces are called lathe fixtures. Most lathe fixtures are mounted on the spindle, while a minority are mounted on the saddle or bed. 2) CMM fixtures: Used on coordinate measuring machines, utilizing modular support and reference devices to achieve flexible fixation of the measured workpiece. This device allows for automatic programming to support the workpiece and can establish an unlimited number of workpiece configuration reference points. Advanced specialized software can directly generate the workpiece clamping program within seconds using the workpiece's geometric data. 3) Industrial robot fixtures: Mounted on industrial robots and used in industrial automation equipment, representing one of the new technologies in modern industrial automation. They mainly appear in modern industrial production in conjunction with robots, with common applications in automated unmanned factories for machine tool loading/unloading, workpiece palletizing/depalletizing, welding, grinding, etc. 4) Milling machine fixtures: Mounted on the milling machine table and move with the table during feed motion. They mainly consist of locating devices, clamping devices, fixture bodies, connecting elements, and tool-setting elements. During milling, the cutting force is large and the cutting is intermittent, resulting in significant vibration; therefore, milling machine fixtures require high clamping force, as well as high rigidity and strength. 5) Bearing housing fixtures: To ensure and improve the production quality of bearing housings, in addition to using 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. A bearing housing fixture is a production tool specifically designed to ensure the product quality of bearing housings, making the 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, which account for a significant proportion in both quantity and diversity. This type of bearing housing fixture can accurately determine the relative position between the workpiece and the tool, meaning it can clamp the workpiece to be machined, thereby enabling the necessary movements during the machining process. Since bearing housing fixtures play a very important role in the production process, the drafting of bearing housing fixture design drawings is also crucial.

paatz workpiece fixture features

Mechanical grippers commonly use compressed air as the power source, achieving finger movement through a transmission mechanism. Based on the different motion trajectories of the fingers when clamping the workpiece, mechanical grippers are classified into: 1) Arc-opening/closing type: Driven by the transmission mechanism, the motion trajectory of the finger tips is an arc. This type of gripper has strict requirements for the dimensions of the clamped part of the workpiece; otherwise, it may cause abnormal workpiece status. 2) Arc parallel-opening/closing type: In this type of gripper, the two fingers perform parallel opening and closing movements during operation, while the motion trajectory of the finger tips is an arc. The illustrated gripper uses a parallelogram transmission mechanism to drive the parallel opening and closing of the fingers in two scenarios. 3) Linear parallel-opening/closing type: The motion trajectory of the two fingers in this type of gripper is linear, and the clamping surfaces of the two fingers remain parallel at all times. A cam mechanism is used to achieve the parallel opening and closing of the two fingers; inclined cam slots are cut into the sliding blocks of each finger. When the piston rod moves up and down, the rollers mounted at its end move within the cam slots, achieving parallel clamping movement of the fingers. Alternatively, a rack-and-pinion mechanism is used: when the rack at the end of the piston rod drives the gear to rotate, the racks on the fingers move linearly, causing the two fingers to open and close in parallel to clamp the workpiece.

paatz workpiece fixture selection

When selecting pneumatic grippers and jaw designs, these are the main factors to consider: 1) Part shape, orientation, and dimensional variations: If the object has two opposing flat surfaces, a double-jaw parallel gripper can be used to address dimensional deviations. For cylindrical objects, a double-jaw gripper can also be used for clamping. Note that containment or enveloping clamping requires less force. 2) Part weight: The clamping force must be sufficient to hold the object securely while performing 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 task being performed and to the spatial requirements of the gripper jaws. If external operations are to be performed on the object, internal clamping is required. Scissor-type grippers are generally lower in cost but require more space for jaw movement. 4) Environment: Grippers used in harsh environments or cleanrooms require corresponding designs. 5) Object retention: When air pressure is no longer supplied, the gripper will release its hold on the object, causing it to drop. For such applications, spring-assisted grippers can be used.

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