Improving equipment with a wedge mechanism with a concave wedge for separation operations
DOI:
https://doi.org/10.37142/2076-2151/2019-2(49)212Keywords:
separation; wedge; hinge; slider; force; rigidity; friction; coefficient of performance; procurement.Abstract
Chosta N. V. Improving equipment with a wedge mechanism with a concave wedge for separation operations // Material working by pressure. – 2019. – № 2 (49). - Р. 212-217.
Based on the analysis of technologies and equipment for separation operations, it was established that the use of wedge-hinged mechanisms with a concave wedge, in which the graph of the load force change is closest to the typical typical force curve for the workpiece, is most appropriate as executive mechanisms. The purpose of the work is the improvement of equipment with a wedge drive with concave clamps for separation operations. Replacing sliding friction pairs by rolling friction pairs leads to a decrease in rolling friction coefficient to values of 0,01...0,05, while the equipment's efficiency increases to 97...99 %, the technical and economic indicators of the wedge press increase. The use of an additional wedge mechanism in presses with a wedge-hinge mechanism with a concave wedge to provide an approximation stroke, which makes it possible to reduce energy costs for elastic deformation and reduce dynamic loads, is substantiated. The calculations for the wedge mechanism with a concave wedge proved that the ratio of the executive and driving forces significantly depends on the angle of the additional wedge. Consequently, by changing the angle of inclination of the additional wedge in the wedge mechanism, it is possible to achieve various changes in the ratio of the executive and driving forces, which will allow for various metal forming operations to choose the design and operating mode of the wedge mechanism that most closely matches the graphs of technological forces. An original design of an additional wedge knot is proposed, which allows changing the angle of inclination in a given range. In order to increase the rigidity of equipment for separation of long products (pipes), a design of a device containing a wedge mechanism in combination with a frame slider and an additional wedge has been developed, which allows reducing power power costs, reducing the amount of force that corresponds to the moment of rolling separation, therefore, reduce the effects of instantaneous unloading equipment.
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