• Categories:News
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• Time of issue:2021-11-09 10:58
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(Summary description)The arrival quality of seamless push elbow pipe fittings has the following important problems:   First, the wall thickness of the elbow is not uniform     The non-uniform thickness of elbow pipe wall occurs mainly at the part with the largest deformation of pipe fittings.If the thickness of the pipe wall on the back of the elbow is thinner than that on other parts, the thickness of the pipe wall is not equal to that of the pipe mouth and pipe fitting body.   Second, elbow hardness overspend   The occurrence of seamless hardness overspend problem, if because of the forming of the heat treatment process problem, the treatment method is to use accurate heat treatment process to suspend a heat treatment.     Third, elbow material defects   Push elbow is the most harmful to assembly safety.Introspection is more difficult.The origin of defects is more complicated, it has its own material defects and processing technology problems and heat treatment process is not accurate defects.   Fourth, bend inside the arc wrinkle   When the arc interface of seamless elbow is a heating push time, the external load of these changes will constitute the welding joint in a complicated stress state, which will severely weaken the strength of the welding joint, and then reduce the welding joint, more seriously is to shorten the service life of seamless elbow.   Hot push bend deformation characteristic is according to the volume before and after plastic deformation rule of metal materials determine the pipe diameter, chooses the pipe diameter less than bend diameter, through the core module and control the deformation of the process, make the inner arc metal activity is compressed, the compensation to the other parts of the thinned by expanding, then get the wall thickness of the elbow.     Hot push elbow forming process has the characteristics of beautiful appearance, uniform wall thickness and continuous operation, suitable for mass production, so it has become the main forming method of carbon steel, alloy steel elbow, and also used in some standard stainless steel elbow forming.The heating method of forming process has medium frequency or high frequency induction heating (heating ring can be multi-ring or single ring), flame heating and reflector heating, which heating method to choose according to the requirements of forming products and energy conditions.