Method for inductively heating steel ingots on a transport shoe and device for carrying out the method

Patent metadata

Field	Value
Publication number	US-12276457-B2
Application number	US-202017421101-A
Country	US
Kind code	B2
Filing date	Jan 8, 2020
Priority date	Jan 8, 2019
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

A shell ( 10 ) acts as a transporting shoe for steel ingots, which are pushed through a preferably tubular induction furnace for inductive heating for the purpose of producing seamless tubes by the extrusion process. The shell ( 10 ) is formed in such a way that it partially reaches around the contour of the steel ingot to be heated. The shell is provided at one end leading in the pushing-through direction or transporting direction, with a shoulder ( 12 ), which extends at an angle to the transporting direction, against which the steel ingot rests in such a way that the pushed-through steel ingot takes the shell ( 10 ) along with it. A method for inductively heating steel ingots uses a shell ( 10 ) as described.

First claim

The invention claimed is:

1. A method for inductively heating steel ingots for producing seamless tubes by an extrusion process, comprising the following steps:
a) extracting a shell from a shell magazine,
wherein the shell is made of a non-magnetizable or non-inductive sheet, and
wherein the shell is formed such that it partially reaches around a contour of the steel ingot to be heated, and
wherein the shell is provided at one end leading in a transporting direction with a shoulder, which extends at an angle to the transporting direction, against which the steel ingot rests in such a way that the steel ingot being pushed-through takes the shell along with it;

b) placing the shell on an insertion device, such that the shoulder comes to rest at the end leading in the transporting direction and points upwards against the force of gravity;
c) placing the steel ingot on the shell to form an assembly;
d) sliding the assembly of the shell with the steel ingot located thereon into an induction furnace, wherein the assembly of the shell and the steel ingot thereby pushes forward a further steel ingot, if any, already located in the induction furnace on a further shell,
e) pulling out the heated steel ingot on the shell and with the shell from the induction furnace;
f) separating the heated steel ingot from the shell; and
g) repeating the method steps a) to f),
wherein the method steps a) to f) are carried out in the order in which they are listed,
wherein separating the heated steel ingot from the shell according to method step f) takes place during a horizontal transport movement of the assembly consisting of the heated steel ingot and the shell on a horizontal transport means,
wherein the horizontal transport movement of the steel ingot is stopped by a stop or at a stop,
wherein the stop acts directly against an end face of the steel ingot leading in the transporting direction of the steel ingot, and
wherein the stop is arranged in such a way that it acts as a stripper when the steel ingot is lifted off the shell, and
wherein a height of the stop is selected such that lifting the heated steel ingot with an ingot lifting device causes the shell to be stripped from the steel ingot, in case the shell sticks to the steel ingot.

2. The method according to claim 1 ,
wherein the shell is extracted from the shell magazine by a lifting device and is placed on a slide-in roller table, and
wherein the steel ingot is subsequently placed on the shell located on the slide-in roller table, and
wherein the assembly comprising the shell and the steel ingot is pushed by a hydraulic ram from the slide-in roller table into the induction furnace.

3. The method according to claim 1 ,
wherein the heated steel ingot is pulled by extraction pliers with the shell out of a compensating chamber of the induction furnace onto an extraction roller table.

4. The method according to claim 1 ,
wherein the transport means is an outfeed roller table, and
wherein the ingot lifting device lifts the steel ingot vertically off the shell while the shell is on the outfeed roller table.

5. The method according to claim 4 ,
wherein the stop extends over the outfeed roller table in form of a yoke or a bridge.

6. The method according to claim 5 , further comprising:
transporting the shell on the outfeed roller table to a shell extraction position after separating the ingot.

7. The method according to claim 6 , further comprising:
returning the shell at the shell extraction position to one of the shell magazines by a shell manipulator.

Assignees

• Sms Group Gmbh

Inventors

• Fussbroich Klaus

Classifications

• C21D8/10

  during manufacturing of tubular bodies · CPC title

• F27D2003/0034

  Means for moving, conveying, transporting the charge in the furnace or in the charging facilities · CPC title

• F27D2003/0003

  involving a system for aligning the articles through a lateral guidance, e.g. funnel · CPC title

• F27D3/06

  Charging or discharging machines on travelling carriages · CPC title

• C21D9/0081

  for slabs; for billets · CPC title