In aviation parts processing, thread connection is a common connection method. The use of threaded parts can firmly connect multiple parts. It has the advantages of simple structure, reliable connection, convenient assembly and disassembly, and low cost. Therefore, it is widely used, in addition to the connection function, it can also be used for fixation, adjustment, transmission and other functions.
The general knowledge of thread, first of all, let's understand the role and structure of thread in aviation parts processing. (1) Thread formation: a triangle is wound around the cylinder, and the bottom edge of the triangle coincides with the circumference of the cylinder. The bevel edge of the triangle forms a spiral shape on the surface of the cylinder. If the turning tool of different shapes is used to rotate along the spiral line, the triangular, rectangular, trapezoidal and serrated threads can be cut.
Thread profile: thread profile can be seen as a planar figure (such as triangle, trapezoid, rectangle, etc.), which is generated by spiral motion along a cylinder. The plan is a thread profile and different thread profiles have the same purpose.
According to the different directions of helix, thread can be divided into two types: clockwise rotation of the right-hand thread and counterclockwise rotation of the left-hand thread. The right hand can also be used to judge the direction of the line when machining precision parts. When judging, the palm of the hand is facing you, and the four fingers are along the center line of the screw. Then look at the direction of the thread: if the direction of the thread is consistent with the direction of the right thumb, the thread is a right-handed thread. In contrast, left-handed threads are usually used for right-handed threads.
According to different purposes, thread can be divided into connecting thread and driving thread. Connecting thread adopts triangular thread, such as screw and nut thread, transmission thread adopts trapezoidal, serrated and rectangular thread, such as screw thread on lathe. In addition, there are internal thread and external thread, both of which form a thread pair.
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