SUZHOU SUDELAN RAILWAY PARTS CO., LTD. 

苏州苏德兰铁路配件有限公司

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The production process of rail screws

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Nowadays, there are some small products that are ignored by us, ranging from glasses to airplanes. Behind these machines and the great dreams of mankind, they cannot do without the small things-screws. A good screw cannot be separated from a good processing method, such as a screw as small as 1.0 used on precision instruments, as large as a large, super long and extra-long screw used on wind equipment or even airplanes. So, what are the production processes of rail screws?
Thread cutting: generally refers to the method of machining threads on a workpiece with a shaped tool or abrasive tool, mainly including turning, milling, tapping, threading, grinding, grinding and whirlwind cutting. When turning, milling and grinding threads, every time the workpiece rotates, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves accurately and evenly along the axis of the workpiece by a lead. 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 cold heading. The machines used in this production method are generally single-die machines, multi-station machines, and The screws produced by this method are faster in production speed and lower in cost, but compared with the cutting process, the head and tail of the screw produced by this process are naturally formed, and the appearance is relatively round. It is not as sharp as the cutting process, and the appearance is beautiful.
Each method has the benefits of each method. Although the cutting process is not as fast as cold heading, its accuracy is higher than that of cold heading. The cold heading process produces more and faster in quantity and speed, and lower cost, especially when producing those rail screws. , The cold heading process is more cost-effective than the turning process.
Precision electronic small screws generally need to be electroplated, and these electronic screws are very small. It is also difficult to plate! If the number is small, the electroplating factory may also mix with rail screws of different specifications for electroplating, which will make some places unable to be electroplated. That would easily cause the product to be scrapped. We must clean the precision electronic screws before electroplating, and cooperate with the excellent electroplating factory to perfect the precision electronic screws.
Rail screws should not be matched with rigidity during electroplating to affect the quality of screw products:
First, it is difficult to meet the quality requirements of various aspects of electroplating of different screws under conventional electroplating process conditions.
Second, the specifications of the hardware screws are too close, the size and length seem to be similar. Large and hexagonal bolts and hexagonal socket screws have to be plated separately.
Third, heavier screws and lighter screws, and smaller screws and larger screws must be plated separately. Otherwise, the two may be encountered during the electroplating process, causing damage to the screws.
Fourth, the two types of screws that are easy to be stuck together should be electroplated separately. Otherwise, the screws of two different specifications and models will get stuck together and form a ball during electroplating. Easily lead to failure of plating. Even after plating, it is difficult to separate these two types of screws.