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This machine utilizes a combination of axial pushing, localized medium-frequency heating, and a bull-horn mandrel to simultaneously expand and bend pipes in a single operation. Starting with straight pipes smaller in diameter than the finished elbow, the hot pushing process directly produces rough elbows through simultaneous expansion and bending.
Applications
Widely used for manufacturing 90° long-radius R=1.5D seamless elbows in carbon steel, alloy steel, and select stainless steel materials.
Core Operating Principle
The process follows the law of constant metal volume: under axial push from the rear, the pipe billet moves forward and is rapidly heated to plastic temperature (850-1100°C) by a medium-frequency induction coil. The heat-softened steel pipe passes over a stationary horn-shaped mandrel, which gradually thickens with a curved arc, forcing simultaneous circumferential expansion and axial bending.
Outer arc undergoes stretching
Inner arc experiences compression
Metal flow compensates wall thickness
Final elbow shape is achieved
Complete Manufacturing Workflow
Material Preparation: Cut seamless steel pipes to calculated length with inner diameter smaller than finished elbow; apply graphite high-temperature lubricant to inner walls to reduce friction and prevent mandrel scratching.
Material Loading and Clamping: Insert pipe billet onto fixed horn mandrel; rear end held against pipe billet by movable frame push plate; front end of mandrel locked onto fixed frame.
Induction Heating: Position medium-frequency induction coil at horn mandrel entrance to perform localized rapid circumferential heating on the section about to enter deformation zone.
Extrusion Forming (Core Operation): Hydraulic/servo-driven push plate pushes pipe billet forward at uniform speed; heated section slides along horn mandrel, simultaneously expanding inner diameter while bending according to mandrel curvature.
Mandrel Removal: After entire elbow passes through sizing section, formed elbow is detached from horn mandrel.
Post-Processing: Thermal shaping, heat treatment (normalizing/tempering, mandatory for alloy steels), grooving, non-destructive testing, and sandblasting.
Main Equipment Components
Extrusion Main Machine: Fixed frame, movable push plate, hydraulic/servo propulsion system
Forming Tools: Horn mandrel + mandrel rod (forming die)
Heating System: Medium-frequency power supply + water-cooled induction heating coil
Support Systems: Cooling system, temperature measurement system, control system
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Ecer Certification：
Verified Supplier
Our main business: waste paper packing machine,Elbow Forming Machine,Tee Forming Machine,Pipe Fitting Beveling Machine,Shot Blasting Machine etc. I plant has advanced production and processing equipment and high-quality technology, management personnel. We always adhere to the business philosophy of... Our main business: waste paper packing machine,Elbow Forming Machine,Tee Forming Machine,Pipe Fitting Beveling Machine,Shot Blasting Machine etc. I plant has advanced production and processing equipment and high-quality technology, management personnel. We always adhere to the business philosophy of...
