German Hilma workholding fixtures Hilma models Hilma prices

Hilma workholding 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 because it can no longer be used. 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 machine tool's machining motion during processing. It typically consists of positioning elements, clamping devices, tool-setting and guiding elements or devices, etc.

Hilma workholding fixture classification

Fixture types can be classified by usage characteristics as follows: (1) Universal general-purpose fixtures. Such as machine vises, chucks, suction cups, indexing heads, and rotary tables, which have great versatility and can adapt well to changes in machining operations and workpieces. Their structures are standardized, and their dimensions and specifications are serialized, with most becoming standard accessories for machine tools. (2) Dedicated fixtures. Specifically designed and manufactured for the clamping needs of a certain product part in a specific operation, serving a single purpose with strong specificity, generally designed by the product manufacturer. Common types include lathe fixtures, milling fixtures, drill jigs (machine tools used to guide drills or reamers on workpieces), boring jigs (machine tools used to guide boring bars on workpieces), and pallet fixtures (movable fixtures used on automated lines of modular machine tools). (3) Adjustable fixtures. Dedicated fixtures with replaceable or adjustable elements. (4) Modular fixtures. Fixtures composed of standardized elements of different shapes, specifications, and uses, suitable for new product prototyping, single-piece and small-batch production with frequent product changes, and temporary tasks. In addition to vises, chucks, indexing heads, and rotary tables, there is a more common type called tool holders. Generally speaking, when the term tool fixture appears, it mostly refers to tool holders.

Hilma workholding fixture features

1) Standardization: The standardization and generalization of machine tool fixtures are two interrelated aspects. China already has national standards for fixture parts and components: GB/T2148~T2259－91, as well as standards for various general-purpose fixtures and modular fixtures. Standardization of machine tool fixtures facilitates commercial production of fixtures, helps shorten production preparation cycles, and reduces total production costs. 2) Precision: As the precision of mechanical products increases, the precision requirements for fixtures inevitably rise. There are many structural types of precision fixtures, such as multi-tooth discs for precise indexing, with an indexing accuracy of ±0.1"; and high-precision three-jaw self-centering chucks for precision turning, with a centering accuracy of 5μm. 3) High efficiency: High-efficiency fixtures are mainly used to reduce the basic and auxiliary time of workpiece machining, thereby improving labor productivity and reducing workers' labor intensity. Common high-efficiency fixtures include automated fixtures, high-speed fixtures, and fixtures with clamping force devices. For example, using electric vises on milling machines to clamp workpieces can increase efficiency by about 5 times; using high-speed three-jaw self-centering chucks on lathes ensures that the jaws firmly clamp the workpiece even at a test speed of 9000r/min, significantly increasing cutting speed. In addition to configuring corresponding high-efficiency and automated fixtures in production lines and automated lines, various automatic workpiece clamping fixtures and automatic fixture changing devices have appeared on CNC machine tools, especially machining centers, fully leveraging the efficiency of CNC machine tools. 4) Flexibility: The flexibility of machine tool fixtures is similar to that of machine tools, referring to the ability of machine tool fixtures to adapt to variable process factors through adjustment, combination, etc. The main variable process factors include: operation characteristics, production batch size, workpiece shape and dimensions, etc. New types of fixtures with flexibility characteristics mainly include: modular fixtures, general-purpose adjustable fixtures, group fixtures, modular fixtures, and CNC fixtures. To meet the needs of modern mechanical industry for multi-variety, small and medium batch production, expanding the flexibility of fixtures, changing the non-disassemblable structure of dedicated fixtures to disassemblable structures, and developing adjustable fixture structures will be the main direction of current fixture development.

Hilma workholding fixture selection

When selecting pneumatic grippers and jaw designs, these are the main factors to consider: 1) Part shape, orientation, and dimensional differences: If the object has two opposing flat surfaces, a parallel two-jaw gripper can be used, which resolves dimensional deviation issues. For cylindrical objects, a two-jaw gripper 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 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 size of the gripper jaws. If external operations are to be performed on the object, internal clamping is required. Scissor-type grippers are usually cheaper 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 releases its hold on the object, causing it to drop. For such applications, spring-assisted grippers can be used.

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