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swissmole fixtures refer to devices used in the mechanical 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 mount workpieces during any stage of a 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 between the tool and the workpiece or to guide the tool direction), indexing devices (enabling the workpiece to undergo machining at multiple 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 and are often simply referred to as fixtures. When machining workpieces on machine tools, to ensure that the workpiece surfaces meet technical requirements such as dimensions, geometric shapes, and mutual positional accuracy with other surfaces as specified in drawings, the workpiece must be properly located (positioning) and securely held (clamping) before machining.

swissmole fixture classification

1) Lathe fixtures: Fixtures used on lathes to machine internal and external rotational surfaces and end faces of workpieces are called lathe fixtures. Most lathe fixtures are mounted on the spindle, while a minority are installed on the saddle or bed. 2) CMM fixtures: Used on coordinate measuring machines, utilizing modular support and reference devices to achieve flexible fixation of measured workpieces. This device supports automatic programming to support workpieces and can establish unlimited workpiece configuration reference points. Advanced dedicated software can directly generate workpiece clamping programs within seconds using the workpiece's geometric data. 3) Industrial robot fixtures: Mounted on industrial robots for use in industrial automation equipment, representing one of the newer technologies in modern industrial automation. They primarily appear in modern industrial production in coordination with robots, with common applications in automated unmanned factories for machine tool loading/unloading, workpiece palletizing/depalletizing, welding, grinding, etc. 4) Milling machine fixtures: Installed on milling machine tables, 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, cutting forces are high and cutting is intermittent, causing significant vibration; therefore, milling 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, extensive 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 product quality, making the bearing housing 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, accounting for a significant proportion in both quantity and diversity. These fixtures 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, drawing their design diagrams is also very important.

swissmole fixture features

Mechanical grippers commonly use compressed air as the power source, transmitting motion to the fingers via a transmission mechanism. Based on the different motion trajectories of the fingers when clamping workpieces, mechanical grippers are classified into: 1) Arc-opening type: Driven by the transmission mechanism, the finger tips move along an arc trajectory. This type of gripper has strict requirements for the dimensions of the clamped area of the workpiece; otherwise, it may cause abnormal workpiece status. 2) Arc-parallel opening type: In this type, the two fingers move in parallel opening and closing motions, while the finger tips follow an arc trajectory. 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 trajectories of the two fingers are linear, and the clamping surfaces of the two fingers remain parallel at all times. A cam mechanism is used to achieve parallel opening and closing of the two fingers; inclined cam slots are machined into the sliding blocks of each finger. When the piston rod moves up and down, 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.

swissmole fixture applications

1) Consistently ensures workpiece machining accuracy: When clamping workpieces with fixtures, the positional accuracy of the workpiece relative to the tool and machine tool is guaranteed by the fixture, unaffected by the worker's skill level, ensuring consistent machining accuracy across a batch of workpieces. 2) Reduces auxiliary time and improves labor productivity: Using fixtures makes workpiece clamping convenient and fast, eliminating the need for scribing and alignment, significantly reducing auxiliary time; clamping workpieces in fixtures increases workpiece rigidity, allowing for higher cutting parameters; fixtures capable of clamping multiple workpieces or multiple stations can be used, along with high-efficiency clamping mechanisms, further improving labor productivity. 3) Expands the usage range of machine tools, achieving multi-functionality: By attaching different types of fixtures according to the forming motion of the machining machine tool, the original process range of the machine tool can be expanded. For example, installing boring jigs on the carriage of a lathe or the table of a radial drilling machine enables boring operations on box-type parts. 4) Ensures machining accuracy: Using fixtures for installation allows accurate determination of the mutual positions between the workpiece, machine tool, and tool. Workpiece positional accuracy is guaranteed by the fixture, independent of the worker's skill level, resulting in high and stable machining accuracy. 5) Increases productivity and reduces costs: Clamping workpieces with fixtures allows rapid positioning and clamping without alignment, significantly reducing auxiliary time; clamping increases workpiece rigidity, permitting higher cutting parameters; multi-workpiece and multi-station fixtures can be used with high-efficiency clamping mechanisms, all of which contribute to higher labor productivity. Additionally, using fixtures stabilizes product quality, reduces scrap rates, allows the assignment of lower-skilled workers, and significantly lowers production costs. 6) Expands the process range of machine tools: Using special-purpose fixtures can change the original purpose of the machine tool and expand its usage range, achieving multi-functionality. For example, after installing boring jig fixtures on lathes or radial drilling machines, boring operations can be performed on hole systems of box parts; special-purpose fixtures can also convert lathes for broaching operations, fully leveraging the capabilities of general-purpose machine tools. 7) Reduces workers' labor intensity: Clamping workpieces with fixtures is convenient and fast; when using pneumatic, hydraulic, or other clamping devices, workers' labor intensity is reduced.

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