What are the production processes of precision small screws?

Publish time: 15 Jan 22

There are some small products that we ignore now, ranging from glasses to airplanes. Behind these machines and the great dreams of mankind, they are inseparable from small things - screws. A good screw is inseparable from a good processing method, such as a small 1.0 precision small screw used on precision instruments, a large super-long super-long screw used in wind equipment and even aircraft.

Precision small screws generally need to be electroplated, and we know that these electronic screws are very small. It is also difficult to electroplating! If the number is small, the electroplating factory may mix it with precision screws of different specifications for electroplating, so that some places cannot be electroplated. That could easily lead to product scrapping. We must clean the precision screws before electroplating, and cooperate with the electroplating factory to perfectly electroplate the precision screws.

Precision small screws should not be matched with rigidity during electroplating to affect the quality of screw products:

1. It is difficult to meet the quality requirements of various aspects of electroplating of different screws under the conventional electroplating process conditions.

2. The specifications of the hardware screws are too close, and the size and length seem to be similar. Large and hex bolts are plated separately. Otherwise, when the electroplating is good, it is not easy to score, and the screening is not good.

3. Heavier screws and lighter screws, smaller screws and larger screws must be plated separately. Otherwise, the two may encounter during the electroplating process, resulting in damage to the screws.

4. The screws that are easy to be stuck together should be plated separately. Otherwise, the screws of two different specifications and types are stuck together, and they will form a ball during electroplating. It is easy to lead to the failure of electroplating. Even after plating, it is difficult for us to separate the two types of screws.

Thread cutting: generally refers to the method of machining threads on workpieces with forming tools or abrasives, mainly including turning, milling, tapping, threading, grinding, grinding and whirling cutting. When turning, milling and grinding threads, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves exactly and evenly one lead along the axis of the workpiece for each revolution of the workpiece. When tapping or threading, the tool (tap or die) and the workpiece rotate relative to each other, and the tool (or workpiece) is guided by the previously formed thread groove to move axially.

Thread rolling: the processing method of plastically deforming the workpiece with a forming rolling die to obtain a thread, which is also commonly referred to in the industry as cold heading. The screw produced by this method has a faster production speed and lower cost, but compared with the cutting process, the screw head and tail produced by this process are naturally formed, and the appearance is relatively round. It will not be as angular and beautiful as the cutting process.

Each method has benefits of each method. Although the cutting process is not as fast as cold heading, its accuracy is higher than that of the cold heading process, while the cold heading process can produce more and faster in quantity and speed, and the cost is lower, especially for those precision small screws. At times, the cold heading process is more cost-effective than the turning process.