HuaJin Heavy Equipment

Introduction to Expanding Machine

TIME: 2021-04-10

1、 The expanding machine belongs to the straight seam metal welded pipe shaping equipment. It uses a conical expanding head to expand inside the steel pipe, eliminate the forming pressure of the steel pipe, and ensure that the true diameter of the entire length of the straight seam welded steel pipe varies. The equipment consists of a small car, an expander, a task sleeve, a fixed seat, an oil cylinder, a smooth station, a bench, a hydraulic station, and electronic control components. The expander is installed on a small car, which is connected to the oil cylinder by a task sleeve. The expander is composed of an expander head, expansion block, guide plate, pull rod, etc. A large-scale equipment that ensures the external diameter of straight seam metal welded pipes and eliminates stress through segmented machine extrusion technology.

The working principle of the steel pipe (pipe end) expanding machine is to cover the formed and internally and externally welded qualified steel pipes on the mold of the expanding machine. The steel pipes expand outward in the radial direction through the mold, and under the action of the mold, the steel pipe material undergoes flow deformation to redistribute internal stress uniformly. By strictly controlling the radial displacement of the mold, the flow deformation of the steel pipe material can be controlled, so that the diameter accuracy and roundness accuracy of the pipe end within the specified length meet the requirements of API 5L standards.

This machine is a specialized equipment for the production line of submerged arc welded steel pipes. It is used to cold expand and shape the pipe ends of straight seam welded steel pipes or spiral submerged arc welded steel pipes (the inner weld seam within 250mm range of the spiral welded steel pipe end is polished, and the excess height is not more than 0.5mm), so that the diameter size and roundness of the pipe ends within the specified length reach the allowable range, thereby achieving the requirements of round pipe ends and easy welding.

扩径机

2、 Technical parameters and performance indicators

1. Product parameters

(1) Expanded steel pipe diameter range: ¥ 508 to ¥ 920mm

(2) Wall thickness range of expanded steel pipe: 6-20mm

(3) Material grade:~X70

(4) Expanded steel pipe length range: 8-12.5m

(5) Single weight of expanded steel pipe: Max6 tons

(6) Quality requirements for expanded steel pipes: meet the requirements of API SPEC5L standard for welded steel pipes, and the weld height within 250mm of the pipe end shall not exceed 0.5mm.

2. Expander parameters

(1) Expansion method: hydraulic expansion

(2) Expansion length: Maximum 150mm for straight sections (adjustable from 100 to 150mm, transition section 100mm)

(3) Expansion rate: Max1.5% D

(4) Precision range of expanded steel pipe:

Diameter tolerance: D-0.5+1.6 (measured using perimeter method)

Ellipticity: 0.6% D (ensuring an expansion rate of over 0.3%)

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Introduction to Expanding Machine

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