At present, most of the lifting chains are forged rather than cast. These two processes can complete the production of lifting chains, but there are great differences in quality. What is the reason?
Forging is to achieve the desired shape by relying on external force to deform it after softening at high temperature. However, casting is to put the metal into the mold after liquefaction, and then form it after the liquefied metal is condensed and solidified. There are essential differences between the two processes.
The reason why the lifting chain is forged is that the mechanical property of the casting is lower than that of the forging with the same material. Because the structure and performance of the liquefied metal have completely changed. In addition, forging can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging is consistent with the shape of the forging, and the metal streamline is complete.
Forging of the lifting chain can ensure that the chain link has good mechanical properties and long service life. Forgings produced by precision die forging, cold extrusion, warm extrusion and other processes are incomparable to castings. Forgings are objects where metal is pressed to shape the required shape or appropriate compression force through plastic deformation. This force is typically achieved by using a hammer or pressure.
From this point of view, the forging treatment of the lifting chain can not only ensure its strength, but also further increase the compactness of the internal structure, further its density, and increase its strength a lot, which is impossible for casting. Therefore, more lifting chains will be forged.
Methods to avoid chain jamming of lifting chain
It is inevitable that the lifting chain will be blocked during the lifting operation, which will not only affect the normal lifting of heavy objects, but also have potential safety hazards. Therefore, the operator should pay attention to many details to avoid the locking of the lifting chain.
First of all, when replacing the lifting chain, the chain matching the chain wheel should be selected, so that the chain jamming caused by the chain inconsistency can be avoided; Secondly, the mixed use of new and old chains is also prone to the phenomenon of chain jamming, so everyone should try to avoid the mixed use of new and old chains when lifting; Moreover, the chain structure is not smooth, which will also lead to the occurrence of chain jamming. Therefore, when choosing the chain, we must try to choose those chains with good welding and smooth surface; In addition, regular maintenance shall be carried out for the lifting chain to reduce rust and avoid the occurrence of chain jamming.