Formation of screw head
In general, the cold forging process of bolt head by using forging machines such as upsetting machine or ejector is called upsetting process. The so-called cold forging and pressing is to process at room temperature. It is a relative term to warm and hot working of billet after heating. A kind of
The process of forging is to cut the coiled steel into appropriate lengths and use several forging die devices to forge the material (while exerting pressure on the material, while deforming the material). As the basic processing method of forging, upsetting, deep drawing, reverse extrusion and dressing are four. Upsetting is to extrude the material from one end to make it expand to larger diameter than the original processing; deep drawing, on the contrary, is to extrude the material from one end to make it smaller than the original diameter processing; reverse extrusion is to extrude the material from the end of the material to the forging die with smaller diameter than the material, so that the material extrudes outward and wears through at the same time. Hole processing; Repair is the use of forging die to remove the excess thickness of the processing. According to the shape of the processed products, these processing methods can be used separately or in combination for forming. The more complex the shape of the product, the more need to increase the processing process, slowly forming processing, but ordinary bolts only need 2-5 processing processes can be processed and formed.