wkk fixtures, German wkk models, wkk prices

wkk fixtures are devices used in the mechanical manufacturing process to secure the workpiece in the correct position for machining or inspection; they are also known as clamps. In a broad sense, any device used to quickly, conveniently, and safely install workpieces 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 of the tool and 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, with machine tool fixtures being the most common and often referred to simply as fixtures. When machining workpieces on machine tools, the workpiece must be properly located and securely clamped before machining to ensure that its surface meets the technical requirements specified in the drawings, such as dimensions, geometric shape, and positional accuracy relative to other surfaces.

wkk 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 grasp 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 a gripper holds a workpiece, there must be certain force and shape constraints to ensure that the clamped workpiece is fully released during movement, dwelling, and loading. Additionally, it must ensure that the geometric deviation of the workpiece holding posture remains within the specified tolerance zone.

wkk fixture features

Mechanical grippers commonly use compressed air as the power source, with finger motion achieved 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: The two fingers of this gripper move in parallel opening and closing motions 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 of this 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. Diagonal cam slots are machined into the sliding blocks of each finger. When the piston rod moves up and down, rollers mounted on 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.

wkk 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 less expensive but require more space for jaw movement. 4) Environment: Grippers used in harsh environments or cleanrooms require appropriate 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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