Device and method for achieving core part press-down technology in continuous casting round billet solidification process

Patent metadata

Field	Value
Publication number	US-11123780-B2
Application number	US-201916646019-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Feb 1, 2019
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

A device for achieving a core part press-down technology in a continuous casting round billet solidification process includes a plurality of round billet radial press-down devices distributed along an axial array of round billets outside a press-down interval of the round billets. The press-down interval is an area from 0.65 of a solid phase ratio of the round billets to solidification end points. Each round billet radial press-down device includes a plurality of press-down rollers. A forming hole for extruding the round billets is formed between the press-down rollers. Two adjacent round billet radial press-down devices are arranged in the manner of staggering. The device can effectively solve the defect problems of porosity, segregation and the like in the core of the continuous casting round billets, the yield of the continuous casting round billets is increased, and the production cost is reduced.

First claim

What is claimed is:

1. A device for achieving a core part press-down technology in a continuous casting round billet solidification process, comprising a plurality of round billet radial press-down devices distributed along an axial array of round billets outside a press-down interval of the round billets, and the press-down interval being an area from 0.65 of a solid phase ratio of the round billets to solidification end points;
wherein each round billet radial press-down device comprises three press-down rollers distributed along a circumference of a central axis of the round billets in an array; a forming hole for extruding the round billets is formed between the three press-down rollers of each round billet radial press-down device; and forming holes of the round billet radial press-down devices near forming ends of the round billets and the forming holes of the round billet radial press-down devices near solidification ends of the round billets are formed in a gradual change manner from a triangle to a circle;
wherein two adjacent round billet radial press-down devices are arranged in a manner of staggering by 180 degrees;
wherein a water cutting plate is arranged at an outer side of each press-down roller, and a shape of the water cutting plate corresponds with a roller shape of each press-down roller; and
wherein the press-down rollers of each round billet radial press-down device have a function of opening and closing along a radial direction of the round billets.

2. The device according to claim 1 , wherein a total number of the round billet radial press-down devices are two to five.

3. The device according to claim 1 , wherein each press-down roller is made of heat-resistant steel.

4. A method for achieving a core part press-down technology in a continuous casting round billet solidification process by using the device for achieving the core part press-down technology in the continuous casting round billet solidification process according to claim 1 , the method comprising the following steps:
step 1: importing a material, a diameter and a casting speed of each of the round billets, a crystallizer water amount of a casting machine and a water amount of a secondary cooling zone into a finite element analysis software; determining a solid phase ratio at a beginning of press-down through a finite element analysis, and determining a starting position and an ending position of a press-down interval;
step 2: running the round billets from an outlet of the casting machine to the round billet radial press-down devices along an axial direction of the round billets, when the round billets reach the round billet radial press-down devices, the round billets start to be pressed down by the round billet radial press-down devices, and after all the round billets pass through the round billet radial press-down devices, the press-down is stopped; and
step 3: spraying cooling water onto an outer surface of each press-down roller to cool each press-down roller during the press-down of the round billet radial press-down devices, and the cooling water after cooling flowing back to an equipment cooling water system of the casting machine along the water cutting plate of each press-down roller.

5. The method according to claim 4 , wherein a press-down rate of a single round billet radial press-down device is 5%-40%, and a total press-down rate of the device for achieving a core part press-down technology in a continuous casting round billet solidification process is 10%-60%.

6. A device for achieving a core part press-down technology in a continuous casting round billet solidification process, comprising a plurality of round billet radial press-down devices distributed along an axial array of round billets outside a press-down interval of the round billets, and the press-down interval being an area from 0.65 of a solid phase ratio of the round billets to solidification end points;
wherein each round billet radial press-down device comprises two press-down rollers distributed along a circumference of a central axis of the round billets in an array; a forming hole for extruding the round billets is formed between the two press-down rollers of each round billet radial press-down device; and forming holes of the round billet radial press-down devices near forming ends of the round billets and forming holes of the round billet radial press-down devices near solidification ends of the round billets are formed in a gradual change manner from an elliptic to a circle;
wherein two adjacent round billet radial press-down devices are arranged in a manner of staggering by 90 degrees;
wherein a water cutting plate is arranged at an outer side of each press-down roller, and a shape of the water cutting plate corresponds with a roller shape of each press-down roller; and
wherein the press-down rollers of each round billet radial press-down device have a function of opening and closing along a radial direction of the round billets.

7. The device according to claim 6 , wherein a total number of the round billet radial press-down devices are two to five.

8. The device according to claim 6 , wherein each press-down roller is made of heat-resistant steel.

9. A method for achieving a core part press-down technology in a continuous casting round billet solidification process by using the device for achieving the core part press-down technology in the continuous casting round billet solidification process according to claim 6 , the method comprising the following steps:
step 1: importing a material, a diameter and a casting speed of each of the round billets, a crystallizer water amount of a casting machine and a water amount of a secondary cooling zone into a finite element analysis software; determining a solid phase ratio at a beginning of press-down through a finite element analysis, and determining a starting position and an ending position of a press-down interval;
step 2: running the round billets from an outlet of the casting machine to the round billet radial press-down devices along an axial direction of the round billets, when the round billets reach the round billet radial press-down devices, the round billets start to be pressed down by the round billet radial press-down devices, and after all the round billets pass through the round billet radial press-down devices, the press-down is stopped; and
step 3: spraying cooling water onto an outer surface of each press-down roller to cool each press-down roller during the press-down of the round billet radial press-down devices, and the cooling water after cooling flowing back to an equipment cooling water system of the casting machine along the water cutting plate of each press-down roller.

10. The method according to claim 9 , wherein a press-down rate of a single round billet radial press-down device is 5%-40%, and a total press-down rate of the device for achieving a core part press-down technology in a continuous casting round billet solidification process is 10%-60%.

Assignees

• Univ Northeastern

Inventors

• Yuan Guo
• Kang Jian
• Zheng Yan
• Li Zhenlei
• Jia Guanglin
• Wang Guodong

Classifications

• B22D11/207

  responsive to thickness of solidified shell · CPC title

• B22D11/16

  Controlling or regulating processes or operations · CPC title

• B22D11/126 Primary

  for cutting · CPC title

• B22D11/1287

  Rolls; Lubricating, cooling or heating rolls while in use · CPC title

• B21B1/463 Primary

  in a continuous process, i.e. the cast not being cut before rolling · CPC title