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英国的劳脱斯(Lotur)汽车公司在压装气门导管这样一道发动机生产的关键工序采用了钢球挤压扩孔技术,缩短了加工时间,提高了加工精度。钢珠挤压技术的关键问题是采用一种超高精度的碳化钨钢球。压装气门导管要经过两道钢球挤压扩孔工序。首先让碳化钨钢球挤压通过铸铝缸盖上的较小尺寸的孔,这样加工出来的孔具有极高的精度和与气门导管压配合的紧密度。压进气门导管以后,第二步就是加工气门导管上的气门杆孔,同样利用高精度的钢球挤压通过较小尺
The UK’s Lotur Motor Company used ball extrusion and reaming to reduce machining time and improve machining accuracy at key processes in the manufacture of an engine such as a pressure valve. The key issue with ball extrusion technology is the use of a very high precision tungsten carbide ball. Compression valve guide to go through two steel ball extrusion reaming process. The tungsten carbide balls are first extruded through the smaller size holes in the cast aluminum cylinder head so that the machined holes have a very high degree of precision and tightness with the valve guides. After the pressure into the valve guide, the second step is to process the valve stem on the valve stem hole, the same high precision ball squeezed through a smaller ruler