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Process of producing elbow pipe fittings by medium frequenc

Process of producing elbow pipe fittings by medium frequency push machine  

Medium frequency push making machine in the production of elbow pipe parts using hot push elbow forming process is the use of common elbow push making machine, core die and heating device, precision seamless steel pipe so that the blank set on the mold under the push making machine to move forward, in the movement of heating, expanding and bending forming process.  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, suitable for mass production, so it has become the main forming method of carbon steel, alloy steel elbow, and also used in the forming of some specifications of stainless steel elbow.  

The heating method of forming process has medium frequency or high frequency induction heating (heating ring can be multiple or single ring), flame heating and reflector heating, which heating method depends on the requirements of forming products and energy conditions.  

Description of the main production process of straight seam welding pipe  

Plate detection: after the steel plate used to manufacture the large-diameter straight seam steel pipe is entered into the production line, the whole plate shall be firstly inspected by ultrasonic.  

Edge milling: double-sided milling of the two edges of the steel plate through the edge milling machine, so as to achieve the required plate width, plate edge parallelism and groove shape;  

Pre-bending: the use of pre-bending machine for plate edge pre-bending, so that the plate edge with the required curvature;  

Forming: on the forming machine, the half of the steel plate after pre-bending will be pressed into a "J" shape through multiple steps, and then the other half of the steel plate is also bent and pressed into a "C" shape, and the intermediate frequency push machine forms an open "O" shape  

Pre-welding: make the straight seam welded steel pipe after forming and use gas shielded welding for continuous welding;  

Internal welding: the inner side of straight seam steel pipe is welded by longitudinal multi-wire submerged arc welding.  

External welding: longitudinal multi-wire submerged arc welding is used to weld the outer side of straight seam submerged arc welded steel pipe.  

Ultrasonic inspection: high pressure boiler tube price of straight seam welding steel pipe internal and external weld and weld on both sides of the base material push machine inspection;  

X-ray inspection I: X-ray industrial TELEVISION inspection of internal and external welds, using image processing system can detect the sensitivity of flaw;  

Expanding: the whole length of submerged arc welded straight seam steel pipe is expanded to improve the dimensional accuracy of the steel pipe and improve the distribution of internal stress of the steel pipe;  

Water pressure test: the water pressure test machine is used to test the steel pipe after diameter expansion one by one so that the steel pipe can meet the standard test pressure. The machine has automatic recording and storage function.  

Chamfering: the pipe end of the qualified steel pipe is processed to meet the requirements of the pipe end bevel size;  

Ultrasonic inspection ii: once again one by one ultrasonic inspection to check straight seam welded steel pipe in the expansion, water pressure may produce defects;  

X-ray inspection ⅱ : X-ray industrial TELEVISION inspection and pipe end weld taking of steel pipe after expanding and hydrostatic test;  

Magnetic particle inspection of pipe end: Perform this inspection to find pipe end defects;  

Anticorrosion and coating: anticorrosion and coating shall be carried out for qualified steel pipes according to user requirements.  

Medium frequency push machine in the production of elbow pipe fittings in the process is the current advanced equipment production, welcome the need of customers consultation order!