The reactor has a total weight of about 500 tons and an ethylene oxide production capacity of 60,000 tons/year. It adopts the US SD company's patented technology and the construction design and manufacture are all completed by one weight. At present, the development of this reactor has entered the design stage and it is scheduled to be completed in October next year. The ethylene oxide reactor will be used in the Bohai Biochemical Project in Jilin City, a wholly-owned subsidiary of Dalian New Group.
According to Cai Lianzhong, a deputy general manager of China’s heavy industry, ethylene oxide is an important chemical raw material that can generate nearly 1,000 kinds of products, and it is toxic and explosive, difficult to transport and import. At present, China’s annual supply and demand gap of ethylene oxide It is 3 million tons. Ethylene oxide reactors are key equipment for the production of ethylene oxide and are key equipment for the petroleum and chemical industries. At present, China has 1.3 million tons/year ethylene oxide production capacity, but the reactors used are all imported equipment, and its manufacturing technology is monopolized by Germany, Japan, Italy and India. The first domestically produced ethylene oxide reactor represents a new step in the production capacity and manufacturing level of large-scale pressure vessel manufacturing, which can greatly increase the manufacturing level and international competitiveness of China's heavy machinery and equipment.
Hobbing uses a hobbing machine with two skew spindles, one mounted with a blank workpiece and the other with the hob. The angle between the hob's spindle (axis) and the workpiece's spindle varies, depending on the type of product being produced. For example, if a spur gear is being produced, then the hob is angled equal to the lead angle of the hob; if a helical gear is being produced then the angle must be increased by the same amount as the helix angle of the helical gear. The hobbing features for gears are straight, helical, straight bevel, face, crowned, worm, cylkro and chamfering. The two shafts are rotated at a proportional ratio, which determines the number of teeth on the blank; for example, for a single-threaded hob if the gear ratio is 40:1 the hob rotates 40 times to each turn of the blank, which produces 40 teeth in the blank. If the hob has multiple threads the speed ratio must be multiplied by the number of threads on the hob. The hob is then fed up into the workpiece until the correct tooth depth is obtained. Finally the hob is fed through the workpiece parallel to the blank's axis of rotation.
Often, during mass production multiple blanks are stacked using a suitable fixture, then cut in one operation.
For very large gears the blank can be gashed to the rough shape first to make hobbing easier.
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