Causes and elimination of common wounds in metal cutting machine tools (4)

Second, the abrasive wear this type <br> <br> RESEARCH REVIEW wound injury refers to hard particle contamination from entering the friction between the two surfaces, a significant role in the cutting of the motion of the surface, so that the friction surface scratch and gouge .

1. Mechanism of abrasive wear-type grinding The hard particles enter between the two friction surfaces and are subjected to two forces, perpendicular to the surface and parallel to the surface. The hard particles penetrate the surface under the former and produce tangential motion under the action of the latter, which causes the surface to be plowed or cut, leaving scratches and grooves, ie, grinding.

2. Classification of abrasive wear type (1) If the guide rail of the machine tool caused by bumping is bumped by high stress of workpiece or tool, the surface of the guide rail will be pitted, and the periphery of the pit will be convex at the same time. Up or burr. If it is not repaired in time, when the skateboard slides on the guide rail, the bump or burr on the guide rail will inevitably cause the skateboard to be injured.

(2) Between the two friction surfaces of the hard particles, such as chips or molding sand entering between the guide rail and the sliding plate of the machine tool, a typical abrasive wear type will be formed: the chip or the molding sand under the vertical pressure, crushing the guide rail or the skateboard On the surface, the rail or the skateboard is wounded when moving.

(3) The dirt entering between the friction surfaces, such as dirt, enters between the friction surfaces through the lubricating oil. Although the friction surface is not pressed, the contact condition of the friction surface can be changed, and the contact with the dirt is affected by the support of the dirt. The compressive stress increases, and after a long period of operation, it is bound to cause scratches or minute scratches on the friction surface.

3. Prevention of abrasive wear type (1) Firstly, it is necessary to prevent the surface of the friction pair from being bruised and bruised. For example, tools such as tools, measuring tools and workpieces are not stacked on the machine guide rail, and secondly, the surface of the friction pair should be repaired after a bump. For example, the raised burrs and burrs should be smoothed with oil stone or scraper in time to prevent the friction surface from being scratched; the pits should be repaired as much as possible to prevent dirt from being trapped in the pits, leaving hidden dangers for the wounds.

(2) Arming and configuring the shield to prevent hard particles such as chips and sand from entering the friction surface. Once hard particles or debris are found between the friction surfaces, they should be removed immediately to prevent the occurrence or expansion of the wound.

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