There are many accessories that we are ignored, from small to glasses, bags to airplanes. These machines and the great human dream behind them are inseparable from a small thing-the precise small screws. And a good precise small screw can’t be separated from good processing methods, such as small the 1.0 precision screw being used in precision instruments to the large extra-long CNC ball screw being used in wind turbines and even aircraft. So, what kind of production techniques are there for precision small screws?
Precision electronic screws have to be electroplated before they can be used, as we know, electronic screws are precise and small, so it is difficult to electroplate them. In the case of a small number of electroplating, factories will choose to mix different specifications of precision screws together for plating but this will cause uneven electroplating of CNC screws resulting in product scrap. Therefore, we must clean the precision electronic screws before electroplating and then cooperate with excellent electroplating of the CNC screws.
When electroplating that the electronic small screws shouldn’t be matched with hard parts to affect the quality of the screw products.
Firstly: It is difficult to meet the quality requirements of different small screws electroplating under the conventional electroplating process.
Second: The specification of the hardware small screw is too close, so will choose electroplating the large size and external hexagon bolts to electroplate separately when plating, otherwise it is difficult to distinguish after the completion of electroplating.
Thirdly: The heavier CNC screws and the lighter small CNC screws are electroplated separately, and the smaller CNC screws and the larger CNC screws are electroplated separately. Otherwise, the two kinds of CNC screws may be bruised and damaged in the electroplating process.
Fourth: the two types of CNC screws that are easy to get stuck together should be electroplated separately. Otherwise, the CNC screws of two different specifications and models will get stuck together and form a ball during electroplating, which will easily lead to failure in electroplating. Even after the CNC screws are electroplated, it is difficult to separate the two types of CNC screws.
Thread cutting: generally refers to the method of machining the threads with a forming cutting tool or grinding, mainly including turning, milling, tapping, threading, grinding, polishing and thread whirling. When turning, milling and grinding threads, the transmission chain of the machine tool ensure that the turning tool, milling cutter, or grinding wheel moves along the axis of the workpiece accurately and uniformly for each revolution of the workpiece. When tapping or threading, the tool (tap or die) rotates relative to the workpiece, and the first formed thread groove guides the tool (or workpiece) to move axially.
Thread rolling: The processing method of plastically deforming the workpiece to obtain the thread with a forming rolling die is also commonly referred to in the industry as a cold heading. The machines used in this production method are generally single-die machines, multi-station machines, clamping machines, etc. It is faster production time and lower cost than this method, but compared with the cutting process, the head and tail of the small screw produced by this process are naturally formed, and the appearance is relatively round. It is not as angular as the cutting process with a beautiful appearance.
Each method has its advantages. Although the speed of the cutting is not as fast as the cold heading, its accuracy is higher than the cold heading. The cold heading process produces more quantity and faster speed, and lower cost, especially for the precision small screws, the cold heading process is more cost-effective than the cutting process.