TPGC070078 fixture, Germany goudsmit, model TPGC070078, in stock

TPGC070078 fixtures are devices used in the manufacturing process to secure workpieces in the correct position for machining or inspection, also known as jigs. Broadly speaking, any device used to quickly, conveniently, and safely install workpieces during any stage 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 and workpiece or guide the tool direction), indexing devices (enabling the workpiece to complete processing at several stations in a single setup; there are two types: 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 workpieces on machine tools, to ensure the workpiece surface meets technical requirements such as dimensions, geometric shape, and mutual positional accuracy with other surfaces as specified in the drawings, the workpiece must be properly located (positioned) and securely clamped before processing.

TPGC070078 fixture working 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 enable subsequent operations, and when the airflow 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 appropriate force constraints and form constraints to ensure that the clamped workpiece is fully released during movement, dwell, and loading. Additionally, it must ensure that the geometric deviation of the workpiece holding posture remains within the specified tolerance zone.

TPGC070078 fixture features

Mechanical grippers commonly use compressed air as the power source, achieving finger motion through a transmission mechanism. Based on the different motion trajectories of the fingers when gripping the workpiece, mechanical grippers are classified into: 1) Arc-opening/closing type: Under the drive of 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 workpiece's gripped area; 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 gripping surfaces of the two fingers always remain parallel. A cam mechanism is used to achieve the parallel opening and closing of the two fingers. Oblique 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 gripping 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 grip the workpiece.

TPGC070078 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 gripping. Note that containment or enveloping grips require less force. 2) Part weight: The gripping 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 gripping 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 the spatial size of the gripper jaws. If external operations are to be performed on the object, internal gripping is required. Scissor-style grippers are usually cheaper but require more space for jaw movement. 4) Environment: Grippers used in harsh environments or cleanrooms need 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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