In the 21st century, the engine in the product manufacturing, manufacturing process, tooling, production management, made a series of changes, there are many different with the past engine manufacturing enterprises. 

In the aspect of product are the obvious trend of lightweight, replace cast iron with aluminium alloy cylinder body parts. Cylinder head products are simple, not in the form of previous overhead camshaft, facilitates the cylinder head machining. On process optimization, curved shaft in addition to the car a car pull technology, has developed a new high-speed milling process, made more flexible. CAM shaft adopts suit type, rather than a monolithic, makes the processing is simple and flexible. Enterprise more and more application of connecting rod breaking process, and mature. 

High performance in engine enterprises are also obvious, a large number of PCD and CBN by coating cemented carbide cutting tool, and cutting speed is greatly increased. Use HSK chuck also is relatively common. And knives, using composite processing technology to save equipment investment and reduce processing time. If use thread a knife of drilling and milling, complete drilling, chamfering, milling thread forming of multifunctional tool at a time. All in all, in terms of products, under the satisfactory performance, makes work process simple, try to solve in the casting some processing, in machining, machining allowance. 

In terms of technology, to adopt new technology, making the tools and equipment meet the need of high speed and flexibility. In production organization and management also has a lot of different places and enterprise's structure is simple, a lot of the service sector, such as oil, cutting fluid, cutting tool and equipment spare parts have to be responsible for by professional company. To motivate personnel through group and rotational manner. Logistics and equipment management is the key, the engine manufacturing enterprises TPM is important one annulus. In terms of quality, the German company attaches great importance to the process quality. 

products 

Lightweight studies show that (1) if the quality of a car can reduce 10%, its fuel economy can be increased by 3% ~ 3%, also can reduce vehicle emissions. To this end, the car manufacturers to make lightweight, high speed, high power engine, and have high durability, best method is to use aluminum cylinder block. Its advantages: (1) aluminum good thermal conductivity, improve the compression ratio of engine, to improve the power is also very good. (2) the cylinder block and cylinder head at the same rate, reduce the thermal stress, while improving on the surface of the cylinder block and cylinder head combined with rigidity. 3. Light weight. 

(2) the structure of the cylinder head, cylinder head structure is generally the camshaft bearing hole of integral aluminum cylinder heads, for convenient process and the whole cylinder head split or divided into three parts. The camshaft is not placed on the cylinder head, and put inside the casing. 

(3) the role of the camshaft camshaft is control valve opening and closing. The first change is that the four valve and the valve of the camshaft to heavy, using lightweight hollow camshaft. The second change, as a rule, the blank is generally a convex shaft casting or forging, then rough machining, heat treatment, the final grinding. And the new camshaft manufacturing method, is to use the prefabricated blank parts, will be prefabricated CAM and related components are assembled into a steel tube, welding Angle to the axial and fixed its position, increased flexibility, disadvantage is high cost.