What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
The production of non-standard round flat pads can only be processed on ordinary lathes without punching machines. Processing with round steel is difficult, material waste is large, tool loss is large, and efficiency is low. The purpose of Guangdong Yueluo Hardware Industry Co., Ltd. is to provide a non-standard circular flat pad lathe processing fixture, which is suitable for the production of various non-standard circular flat pads. Yueluo is realized in this way. It includes a hollow square support, a bolt and a circular machining groove. It is characterized in that a circular machining groove is left on one surface of the hollow square support. There are 4 bolts evenly connected. The advantages of Yueluo are: 1. Reduce the difficulty of processing; 2. Save materials (can use corner waste); 3. Reduce tool wear; 4. Improve production efficiency.
Bolts are widely used as common fasteners. The traditional T-bolt consists of a head, a screw and a tail. The head is a long plane. During the use of the T-bolt of this structure, the T-bolt and the groove The contact surface of the track is a smooth surface, its friction force is not large, its connection is not firm enough, and it is easy to fall off. For this reason, some people design the head as a bevel to increase friction, but only one bevel is in contact with the part in this design, and the sealing is not very good
In addition, in the prior art, rivets are also used to riveted screws on metal plates. The rivets are nail-shaped objects with a cap at one end. In riveting, the riveted parts are connected by their own deformation or interference. When using rivets, it is necessary to set moderately sized positioning holes in the corresponding positions of the two metal plates, and the rivets directly penetrate into the positioning holes and then riveted. Because this riveting method does not require welding, it will leave a hole on the back of the metal plate. Therefore, in the prior art, the surfaces of the two metal plates after riveting are covered with a layer of smooth metal skin to cover the riveting marks, which will also increase the overall cost, including metal The cost of the skin and the increase in the manufacturing process, while the riveting process is limited, the connection between all metal plates cannot be universal.
Screws are a kind of fasteners commonly used in daily life and industry. At present, in use, different types of screws are generally selected for fixing according to different screw lengths and other parameters. Since the screw length is fixed at the time of manufacture, when When using a large number of screws with different screw lengths, it is necessary to sort out screws with different screw lengths beforehand. This method is more troublesome, and sometimes in some special occasions, some screws with special lengths are required. Producing screws of this particular length individually is laborious and laborious.
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