Method for processing biased barrel surface of piston ring

Abstract

The invention discloses a method for processing a biased barrel surface of a piston ring. The method comprises the following steps of: grinding a semicircular surface of an external circle, namely grinding the outer surface of the piston ring into the semicircular surface by using a forming grinder and a copying template, wherein the copying template has single section of circular surface adapted with the size of the piston ring to be ground; and fine honing the semicircular surface of the piston ring into the biased barrel surface by using an oblique pressing plate, wherein the vertical speed of a honing rod is 5 to 8 meters per minute, the rotational speed of a turntable is 30 to 40 revolutions per minute, and a honing sleeve is a single helix cylinder sleeve with 4 to 6 heads. The method obviously improves the collapse condition of the lower edge. The external circle outline curve of the improved biased barrel surface is smooth, the circular transition at the junction of the upper and lower barrel surfaces is good, and the junction area of the lower edge and the lower lateral surface basically has no edge defect so that the exertion of the downward oil scraping function of the piston ring of the biased barrel surface is favorable; meanwhile, the roughness of the external circle surface is obviously improved; and the scuffing resistance and the sealing performance of a loader are improved.

Description

technical field [0001] The invention relates to a processing method for a piston ring, in particular to a processing method for a partial barrel surface of a piston ring. Background technique [0002] The outer circle of the first air ring of a high-load, high-explosive-pressure engine is generally in the form of a partial barrel surface, while the existing processing method is to use a profiling grinding machine to trim the grinding wheel into a reverse barrel shape, and then use the grinding wheel to shape the ring. The outer circular contour of the barrel is directly processed into a shaped barrel surface. This process method has the following disadvantages: [0003] 1. Due to errors in the forming process of the profiling pen, the lower edge of the piston ring, especially the inlaid ring, cannot maintain sharp edges and corners, such as figure 1 As shown, there is a concave profile, which affects its excellent oil scraping performance; figure 1 In, T: the height measur...

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Problems solved by technology

[0003] 1. Due to errors in the forming process of the profiling pen, the lower edge of the piston ring, especially the inlaid ring, cannot maintain sharp edges and corners, such as figure 1 As shown, there is a concave profile, which affects its excellent oil scraping performance; figure 1 In, T: the height measurement of the upper barrel surface; B: the height measurement of the lower barrel surface; O: the theoretical high point of the partial barrel surface; M: the middle point of the ring;

[0004] 2. The roughness of the outer circular surface is basically around Ra0.3~0.4, which is easy to cause the cylinder under the boundary conditions, and the sealing performance of the outer circular surface is not good;

[0005] 3. The outer surface has uneven gloss, fuzzy color, and poor appearance and feel;

[0006] 4. There are errors in the indirect contour replication between the profiling pen of the grinder and the partial barrel surface template, the grinding wheel dressing knife and the grinding wheel due to the complexity of the contour shape (multiple arc curves), which affects the accuracy of the forming of the partial barrel surface Spend

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