Cutting technology behind the engine
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New technology, new tools and a large number of applications
Engine machining is increasingly moving toward high-speed machining. More and more CNC high-speed machining centers are used. The spindle speed of many machining center machines has reached tens of thousands of revolutions. In order to improve production efficiency, the trend of reducing or merging the processing steps is also obvious. For example, the semi-finishing is cancelled, the finishing is directly performed after the rough machining, the fine grinding is performed directly after the roughing, the fine reaming is once in place after the drilling, and the surface is rough-milled once. Finishing meets the requirements, cutting out the machining allowance as much as possible in the roughing process, and the subsequent finishing directly guarantees the machining size and shape, positional accuracy and surface machining quality, which puts high demands on the machine tool and the tool. .
In the face of the need for efficient machining, tool materials have changed a lot, and new carbide tools and superhard tools have been widely used in engines. The new carbide tools have high hardness and good overall cutting performance, while at the same time having the right price/performance ratio.
At the same time, superhard tools have gained wider and wider applications in the automotive industry, mainly CBN (cubic boron nitride), PCD (polycrystalline diamond) tools and ceramic tools. Cylinder boring tools made of CBN have been used in the production of automatic production lines and cast iron and quenching hardware, and have expanded from the field of finishing to semi-finishing, which has greatly improved the cutting efficiency. Nowadays, many parts of the cylinder block, cylinder head, gearbox housing, valve body, groove body and side cover of the automobile engine are made of aluminum alloy. PCD tools are used in the processing of these parts, which has achieved good results. . In the rough and semi-precision of the cylinder bore of the cast iron cylinder block, ceramic tools are often used in many cases.
For efficient machining, combined tools and compound tools are used in large numbers to simplify the process, reduce the number of tools, reduce tool change times and reduce cycle time.
Tool supply localization
The current development of the automobile manufacturing industry is characterized by intensified competition. How can we continuously improve production efficiency, reduce manufacturing costs, provide high-quality products to customers at competitive prices, and meet the increasing demands of users in time to become enterprises in the automobile manufacturing industry. The focus of common concern. In addition to the large number of new tooling and new processes, there is often a need to localize the tool supply.
Since the tool is a consumable product, many companies need to invest a large amount of money each year to purchase foreign tools, which not only has a long lead time, but also requires a certain amount of inventory, thereby increasing production costs. From a long-term perspective, tool supply must be localized or even localized.
In an interview with reporters, Shanghai General Motors Powertrain Da Shiliang said that domestic automakers are now working hard to research and develop their own branded auto products. Some companies have realized independent intellectual property rights in product engineering. However, there are still many places in manufacturing and equipment that depend on foreign technology, and key process equipment still needs to purchase foreign equipment. He believes that not only must there be independent knowledge and production in product engineering technology, but also in the field of manufacturing engineering, research and development should be made in terms of process and equipment, and strive to develop manufacturing technology and corresponding equipment with independent intellectual property rights. A considerable part of the work involved is machine tools and tools.
Of course, in the process of developing our own brands and independent intellectual property rights, our automobile industry still has to carry out one step at a time, and we cannot do it all at once, but we must now pay attention to the research on technology and equipment with independent intellectual property rights in manufacturing processes and equipment. And development, we must work hard in this direction.