Method and apparatus for making seamless pipe
AssigneeSMS group GmbH
InventorsHubert Strank, Peter Thieven, Helge Daehndel
Life of this patent
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Abstract
The invention relates to a device and a method for producing a pipe (1) from a hollow block (2) which has an opening (3). The device has a rolling mill (30) for rolling the hollow block (2) via a rolling rod (21) introduced into the opening (3) of the hollow block (2), whereby the pipe (1) is produced. A retaining device (70) for retaining the pipe (1) is provided behind the rolling mill (30), and the device is further designed such that the rolling rod (21) can be drawn out of the pipe (1) after the rolling process while the pipe (1) is retained by the retaining device (70).
Claims11
An apparatus for making a pipe from a tubular block having a passage, the apparatus comprising:
- a mandrel rod in the passage and connected to the tubular block;
- a shaft rod releasably connected to the mandrel rod for transmitting tensile and compressive force thereto in a travel direction of the tubular block and extending out of the passage opposite to the travel direction;
- a roller mill for rolling the tubular block in a forward in the travel direction over the mandrel rod introduced into the passage of the tubular block such that the pipe is produced;
- a dishing press upstream of the roller mill along a rolling travel path for deforming and pressing together partially or completely a portion of the tubular block for frictional form-fitting contact with the mandrel rod;
- a clamp downstream in the direction of the roller mill for arresting the pipe;
- and
- means for pulling the mandrel rod out of the pipe by exerting traction on the shaft rod while the pipe is arrested by the clamp.
A method of making a pipe from a tubular block having a passage, the method comprising the steps of:
- introducing a mandrel rod in a forward travel direction defining a rolling travel path into the passage of the tubular block;
- deforming and pressing together a portion of the tubular block partially or completely before rolling by a dishing press provided in the rolling travel path so that the tubular block and mandrel rod come into frictional form-fitting contact at the deformed portion;
- releasably connecting a shaft rod to the mandrel rod with the shaft rod extending upstream in the travel direction of the block out of the block;
- transporting an assembly of the mandrel rod and the tubular block along the travel path through a roller mill in order to roll the tubular block over the mandrel rod such the pipe is produced;
- and
- arresting the pipe with a clamp and pulling the mandrel rod out of the passage of the pipe by exerting upstream traction on the shaft rod.
Dependencies are inferred from the claim text.