promat fixtures Germany promat models promat prices

promat fixtures are devices used on machine tools to clamp workpieces and guide cutting tools. They refer to fixtures specifically designed for a particular operation on a specific workpiece. Their characteristics include compact structure, rapid, convenient, and labor-saving operation, ensuring high machining accuracy and production efficiency. However, the design and manufacturing cycle is long, and manufacturing costs are high. When the product changes, the fixture becomes obsolete and is scrapped due to inability to reuse. It is only suitable for production with fixed products and large batch sizes. It contacts the positioning datum of the workpiece to determine the correct position of the workpiece in the fixture, thereby ensuring the correct relative position of the workpiece with respect to the cutting tool and the machining motion of the machine tool during processing. It typically consists of positioning elements, clamping devices, tool-setting and guiding elements or devices.

promat fixture applications

Whether it is a simple hydraulic fixture set or a complex integrated production line, the design process for hydraulic fixtures is the same, proceeding in the following order: formulation of the overall scheme, selection of hydraulic cylinder types and specifications, selection of control valves, design of mechanical parts, selection of pump station accessories, and system connection. Hydraulic fixtures provide powerful clamping and positioning forces for various machining processes. Yunpower cylinders are used for positioning and clamping in automated machining processes. Products such as self-centering vises and self-centering clamping elements provide good positioning, while swing clamp cylinders and lever cylinders provide clamping force on the product, and support cylinders prevent deformation of the product during machining. From simple fixturing to robot-assisted machining centers, cylinders provide clamping and support forces to enhance production efficiency.

promat fixture features

1) Suction cup holding force: The electro-permanent magnetic chuck has extremely strong holding force, reaching up to 16kg/cm², with uniform and adjustable magnetic field distribution, suitable for various heavy-duty machining, roughing, and finishing operations; ordinary permanent magnetic chucks have weaker and uneven holding force, unable to meet the requirements of heavy-duty machining. 2) Machining accuracy: The holding force of the electro-permanent magnetic chuck does not require a continuous power supply to maintain, generating no heat during continuous operation, thus avoiding thermal deformation of the workpiece. Meanwhile, the strong and uniform surface suction ensures the highest machining accuracy even if the workpiece overhangs the table; whereas ordinary electromagnetic chucks require a continuous current supply, generating heat after a period of operation, which not only causes thermal deformation of the workpiece but also reduces the magnetic force of the chuck, failing to guarantee machining accuracy. 3) Performance: The electro-permanent magnetic chuck can be used continuously without any faults or maintenance required, even when operating continuously for more than 20 hours per day; ordinary permanent magnets show a decline in holding force after about half a year of use, while electromagnetic chucks can only operate for a few hours a day, are prone to failure, and require frequent replacement and repair of internal components. 4) Operational efficiency: Using ordinary permanent magnetic chucks requires significant time for workpiece adjustment, accounting for 40%-50% of the entire machining process, and clamping positioning is prone to obvious errors, resulting in a high scrap rate and very low efficiency; the electro-permanent magnetic chuck features automatic auxiliary positioning, completing workpiece clamping or release in just 0.3 seconds with the press of a button, significantly improving production efficiency.

promat 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 parallel two-jaw gripper can be used to address dimensional deviations. For cylindrical objects, a two-jaw gripper can also be used for clamping. Note that encompassing or surrounding grips require less force. 2) Part weight: The clamping force must be sufficient to hold the object securely during the required operations. The type of jaw design must be considered when calculating the required clamping force. Please note that safety factors should be considered when selecting the required force, and air pressure is also a factor to note. 3) Accessibility: This relates both to the operation being performed and the spatial constraints of the gripper jaws. If external operations are to be performed on the object, internal clamping is required. Scissor-style 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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