| How simple is the process of making hot push elbow
Hot push elbow forming process is a process in which the common elbow pushing machine, core die and heating device are used to make the blank on the die move forward under the push of the pushing machine, and it is heated, expanded and bent in the process of motion.Hot push bend deformation characteristics are based on volume before and after plastic deformation rule of metal materials determine the pipe diameter, pipe diameter bend diameter, through the core module and control the deformation of the process, make the inner arc compressed metal flow, the compensation to other parts of the thinned by hole diameter, wall thickness uniform Angle is obtained.
Hot push elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, and is suitable for mass production, so it has become the main forming method of carbon steel and alloy steel elbow, and is also used in the forming of some specifications of stainless steel elbow.
Stamping elbow is the earliest forming process used in mass production of seamless elbow, which has been replaced by hot pushing or other forming processes in the production of elbow of common specifications. However, in some specifications of elbow, the amount of production is small, the wall thickness is too thick or too thin.
The product is still in use when there are special requirements.The stamping of the elbow is made of tube billet equal to the outside diameter of the elbow, which is directly pressed into shape in the die by a press.
Before stamping, the tube billet is placed on the lower die, the inner core and end die are loaded into the tube billet, the upper die moves downward to suppress, and the elbow is formed through the constraint of the outer die and the supporting effect of the inner die.
Compared with the hot pushing process, the appearance quality of stamping forming is not as good as the former.The outer arc of the stamping elbow is in a stretching state when forming, and there is no excess metal in other parts to compensate, so the wall thickness at the outer arc is about 10% thinner.However, because it is suitable for single production and low cost, stamping elbow technology is mostly used in the manufacture of small batch and thick wall elbow.Various elbow has, by contrast, in different occasions are used to match with the elbow, so today we are going to speak of the purpose of this alloy elbow is used to the two root diameter pipe are connected in a bend, so how ultimately want to achieve in a shape and effects, elbow manufacturers We have said is consistent two nominal pipe at the corner place to make it into a 90 - degree Angle shape.Next we introduce several common bend, we is a high manganese alloy elbow, the use of the elbow occasions are generally in some special urgent water flow, the impact strength of big pipe, 2 it is nickel steel alloy elbow, the elbow use situation is special, that is in some of the chemical liquid to flow pipe, like some high levels of oxidative acid used in the pipeline.
Today I received a phone call from a customer who said he needed an elbow machine and wanted to make elbows with spiral tubes. It is theoretically feasible to make elbows with spiral tubes, but the internal weld should be removed. However, the general internal grinding machine is used for straight seaming pipes, and his weld is a straight line.And the welding seam of spiral pipe is spiral, so the internal mill can not, if manual grinding, it is too laborious, and now manual is expensive, so basically not feasible.Later, according to the customer's situation, the manufacturing process of butt welding elbow recommended to the customer, this process is the steel plate cut into one piece, and then pressed into the shape of half elbow, two pieces of butt welding.At present the customer is considering this process.
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