German SCHAAF workpiece fixtures SCHAAF models SCHAAF prices

SCHAAF 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 within the fixture), clamping devices, tool-setting guide elements (to determine the relative position of the tool to the workpiece or guide the tool direction), indexing devices (to allow the workpiece to complete 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, 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 (positioned) and securely clamped (clamped) before machining.

SCHAAF 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 few 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 can be automatically programmed to support the workpiece and establish an unlimited number of workpiece configuration reference points. Advanced dedicated software can directly generate the workpiece clamping program within seconds using the geometric data of the workpiece. 3) Industrial robot fixtures: Mounted 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 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, moving 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, 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 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, occupying a significant proportion in both quantity and variety. These bearing housing fixtures can 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, the drafting of their design drawings is also very important.

SCHAAF 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 type: Driven by the transmission mechanism, the motion trajectory of the finger tips is an arc. This type of gripper has strict requirements on the dimensions of the clamped part of the workpiece; otherwise, it may cause abnormal workpiece status. 2) Arc-parallel opening type: In this type of gripper, the two fingers move in parallel opening and closing motions, 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 type: The motion trajectory of the two fingers in this type of gripper is linear, and the clamping surfaces of the two fingers always remain parallel. A cam mechanism is used to achieve the parallel opening and closing of the two fingers. Inclined cam slots are machined on 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 motion 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.

SCHAAF 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, double-jaw grippers can also be used for clamping. Note that retaining or encompassing 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 operation being performed and 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 the object, causing it to drop. For such applications, spring-assisted grippers can be used.

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