German roemheld workholding fixtures roemheld model roemheld price

roemheld workholding fixture is an electromagnetic chuck that secures the workpiece by the suction force generated by the chuck body when the electromagnetic coil is energized. The electromagnetic chuck consists of an iron core, coil, faceplate, and bracket. The electromagnet, composed of the coil and iron core, is the main part of the electromagnetic chuck. Electromagnetic chucks vary due to differences in design methods or materials used, and they are continuously developing and improving. Initially, electromagnetic chucks were used on grinding machines to replace clamping plates and bolts for securing workpieces to be ground. Such electromagnetic chucks are relatively simple and can only secure flat workpieces. This is the traditional electromagnetic chuck, which has significant limitations in its application. With industrial development, the demand for electromagnetic tools from enterprises has grown, and the requirements have become higher, prompting a series of improvements to electromagnetic chucks to meet production needs.

roemheld workholding fixture structure

The cross-sectional shape and distribution of the pole cores vary depending on the workpiece. Common structural types of electromagnetic chucks include rectangular and circular shapes. Rectangular magnetic poles are arranged either longitudinally or transversely. Longitudinal arrangement of rectangular magnetic poles is suitable for securing larger workpieces; transverse arrangement is suitable for securing smaller workpieces. Circular chucks are suitable for securing ring-shaped workpieces or workpieces with complex shapes. The main characteristics of standard electromagnetic chucks are: magnetic flux lines are evenly distributed on the disk surface, magnetic suction force cannot be concentrated, and the magnetic force per unit area is relatively small; the direction of the magnetic force is perpendicular to the chuck surface and difficult to change, producing only one type of magnetic force for workpieces with the same contact area; the point of action of the magnetic force on the workpiece is limited to the contact surface between the workpiece and the chuck and cannot be arbitrarily changed. Therefore, machining suffers from disadvantages such as low positioning accuracy, insufficient clamping force, narrow scope of application, and low production efficiency.

roemheld workholding fixture manufacturing process

The electromagnetic chuck consists of a base housing, iron core, coil, faceplate, and junction box. The manufacturing process is as follows: 1) Select suitable materials for welding or casting the base housing. 2) Install the iron core onto the base housing according to the type of chuck. 3) Wind the coil with the corresponding number of turns and technical parameters, dry it, and fit it onto the iron core. 4) Pour asphalt or other waterproofing materials into the interior of the base housing. 5) Manufacture the faceplate and install it together with the base housing. Electromagnetic chucks use DC power supply and feature stability, strong suction, and low residual magnetism. Electromagnetic chucks can be classified into standard suction chucks and high-power chucks. The suction force of standard suction chucks is 10-12 kg/cm², while high-power electromagnetic chucks are not less than 14 kg/cm². According to usage, they can be divided into electromagnetic chucks for grinding machines, milling and planing machines, and tool grinding machines.

roemheld workholding fixture applications

1) Ensures stable machining accuracy of the workpiece: When using a fixture to clamp the workpiece, 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 for a batch of workpieces. 2) Reduces auxiliary time and improves labor productivity: Using fixtures for workpiece clamping is convenient and fast; workpieces do not require scribing and alignment, significantly reducing auxiliary time; clamping workpieces in fixtures increases workpiece rigidity, allowing for increased cutting amounts; fixtures capable of clamping multiple workpieces or multi-station workpieces 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 a boring jig on the carriage of a lathe or the table of a radial drilling machine allows for boring processing of box-type parts. 4) Ensures machining accuracy: Using fixture installation accurately determines the mutual position between the workpiece, machine tool, and tool. The positional accuracy of the workpiece is guaranteed by the fixture, unaffected by the worker's skill level, resulting in high and stable machining accuracy. 5) Improves productivity and reduces costs: Clamping workpieces with fixtures allows for rapid positioning and clamping without alignment, significantly reducing auxiliary time; clamping workpieces with fixtures increases workpiece rigidity, allowing for increased cutting amounts; multi-piece and multi-station fixtures can be used, along with high-efficiency clamping mechanisms, all of which help improve labor productivity. Additionally, using fixtures stabilizes product quality, reduces scrap rates, allows for the assignment of workers with lower skill levels, and significantly reduces production costs. 6) Expands the process range of machine tools: Using special 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 processing of hole systems in box parts can be performed; special fixtures can also convert lathes for use as broaching machines, fully leveraging the role 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 can be reduced.

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