Threading is a method of machining various internal and external threads with a threading tool.
　 Tapping and threading
The tapping is performed by screwing the tap into the pre-drilled bottom hole of the workpiece with a certain torque to machine the internal thread.
The thread is used to cut the external thread on the bar (or pipe) workpiece. The precision of tapping or threading depends on the precision of the tap or die. Although there are many methods for machining internal and external threads, small diameter internal threads can only be processed by taps. Tapping and threading can be done manually, as well as lathes, drills, tapping machines and threaders.
　 Thread rolling
Thread rolling is usually carried out on a thread rolling machine or on an automatic lathe with an automatic opening and closing thread rolling head. It is suitable for mass production standards. External threads for fasteners and other threaded couplings.
The outer diameter of the rolling thread is generally not more than 25 mm, the length is not more than 100 mm, the thread precision is up to 2 (GB197-63), and the diameter of the blank used is approximately equal to the median diameter of the thread to be machined. Rolling generally cannot be machined, but for workpieces with softer material, the grooveless extrusion tap can be used to cold-squee the internal thread (up to a diameter of up to 30 mm). The working principle is similar to tapping. The torque required for cold extrusion of the internal thread is about 1 times larger than the tapping, and the machining accuracy and surface quality are slightly higher than the tapping.
The advantages of thread rolling are:
1 surface roughness is less than turning, milling and grinding;
2The surface of the thread after rolling can improve the strength and hardness due to cold work hardening;
3 high material utilization rate;
4 Productivity is multiplied more than cutting, and it is easy to automate;
5 Rolling die has a long life. However, the rolling thread requires that the hardness of the workpiece material does not exceed HRC40; the dimensional accuracy of the blank is required to be high; the precision and hardness of the rolling mold are also high, and it is difficult to manufacture the mold; it is not suitable for the rolling of the tooth profile.
Depending on the rolling die, the thread rolling can be divided into two types: twisting and rolling.
The filature silk is two threaded teeth-shaped crepe plates which are arranged in a staggered 1/2 pitch, the stationary plate is fixed, and the moving plate is made to reciprocate linear motion parallel to the static plate. When the workpiece is fed between the two plates, the moving plate advances to press the workpiece, and the surface thereof is plastically deformed into a thread.
There are three types of thread rolling: radial rolling, tangential rolling and rolling head rolling.
1 radial rolling: 2 (or 3) threaded rolling wheels are mounted on mutually parallel shafts, the workpiece is placed on the support between the two wheels, and the two wheels rotate in the same direction at the same speed, one of which The wheel also performs a radial feed motion. The workpiece is rotated by the rolling wheel and the surface is radially extruded to form a thread. For some precision-adjusted lead screws, a similar method can be used for roll forming.
2 tangential rolling: also known as planetary rolling, the rolling tool consists of a rotating central rolling wheel and 3 fixed curved wire plates. When the wire is rolled, the workpiece can be fed continuously, so the productivity is higher than that of the wire and the radial wire.
3 Thread rolling: It is carried out on an automatic lathe and is generally used to machine short threads on workpieces. There are 3 to 4 rolling rollers distributed on the outer circumference of the workpiece in the rolling head. When the wire is rolled, the workpiece is rotated, the rolling head is axially fed, and the workpiece is rolled out of the thread.
Silk
The twisting yarn is a processing method in which the billet is rolled into a spiral groove when the two jaws are relatively moved.
At present, the entire fastener industry, the silk reeling process is mostly used for the production of wood screws, which was first proposed by the navigation company. The silk shrinking process replaces the original turning process, which not only saves materials, reduces production costs, but also reduces labor costs, and it is important to make the threads sharper and greatly improve the efficiency!Ordinary thread processing - external thread blank diameter calculation - easy to close online query blank calculation ( click on the picture to enter the query URL - )
Ordinary thread processing - external thread calculation - easy to close online query blank calculation ( click on the picture to enter the query URL - )
Ordinary thread processing - internal thread calculation - easy to tighten online query thread calculation ( click on the picture to enter the query URL -" )
American thread size series
American-made external thread calculation - easy to tighten online query US thread ( click on the picture to enter the query URL - )
US internal thread calculation - easy to tighten online query US thread ( click on the picture to enter the query URL - )
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