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. Gear Hobbing,Hobbing Machine,Gear Hobbing Machine,Hobbing Machine Price Jiangsu Hoston Machine Tools Co., Ltd. , https://www.haostonmachinetools.com
At 9:00 on June 29th, in a garage near Luochang Road, a heavy-duty truck wheel suddenly burst, and an auto-worker who was working was injured in the head. According to industry sources, the accident was caused by excessive tire pressure.
According to Mr. Fan, the owner of the auto repair shop, at 7:30 that same day, a yellow heavy truck with a Yushou D license entered the store, and the owner said that the hub of the last wheel on the left side of the car had a problem.
Subsequently, Mr. Fan let 19-year-old auto mechanic Xiao Ming (a pseudonym) go to repair. Mr. Fan said that he also specially told Xiao Ming that the gas in the tire should be let go before maintenance. However, Xiao Ming did not follow Mr. Fan's embarrassment.
As Xiao Ming repaired the wheel, a muffled sound came from the store, and a burst of broken hubs hit Xiaoming's face. Immediately, Xiaoming's face was bloody and direct.
After the accident, Mr. Fan hurriedly sent Xiao Ming to the First People's Hospital of the city and paid more than 3,000 yuan in medical expenses.
How can an automobile hub burst suddenly? How to prevent it? In this regard, the staff of a garage repair shop on Jiudu Road said that if the tire is full of gas, vehicle overload or tires have been used for years, it may cause the car hub to burst.
In response to the preventive measures for such problems, the staff member suggested that drivers should check more on weekdays and should not be overloaded. The air pressure in the tires should be moderate, and it should be promptly replaced if any problems are found in the hub.
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.
Heavy truck wheel burst auto repairer was injured