CN204194425U - A kind of pass schedule avoiding large-size round steel face crack - Google Patents
A kind of pass schedule avoiding large-size round steel face crack Download PDFInfo
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- CN204194425U CN204194425U CN201420479445.8U CN201420479445U CN204194425U CN 204194425 U CN204194425 U CN 204194425U CN 201420479445 U CN201420479445 U CN 201420479445U CN 204194425 U CN204194425 U CN 204194425U
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- pass
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- round steel
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Abstract
The utility model discloses a kind of pass schedule avoiding large-size hot-rolled round steel face crack, the slot bottom width size b of roughing the 1st pass ~ the (n-1)th pass
kfollowing relation is met: b with the supplied materials width B entering this pass first
k/ B=1.030 ~ 1.045.The slot bottom width size b of roughing n-th pass
kfollowing relation is met: B-b with supplied materials width B
k=0 ~ 3mm.Pass width of rebate B
krelation is met: B with the maximum b of rolled piece width and broadening surplus △ that go out this pass
k=b+ △.The utility model efficiently solves the rolling crack on large-size round steel surface, significantly improves product lumber recovery.
Description
Technical field
The utility model belongs to field of metallurgy, relates to a kind of roll pass sequence, especially for the pass schedule avoiding the large-size hot-rolled round steel surface of large rectangle continuous casting billet milling φ 100 ~ φ 180 to crack.
Background technology
Diameter has a wide range of applications in industries such as automobile, machinery, military project, oil at the large-size round steel of φ 100 ~ φ 180mm.At present, this type of large-size round steel generally adopts single chassis multi-pass reversible roughing to add multi-frame hot continuous rolling mode with large rectangle base to produce.Produce for ease of tissue, improve pass commonality, diameter is that the large-size round steel roughing of φ 100 ~ φ 180mm often adopts a set of pass schedule.But because roughing deflection is large, rolling temperature is unreasonable, and the distortion of rolled piece surface metal particle easily enters Rheological Instability district, thus causes and roll rear round steel surface and there is a large amount of crack defect.
Chinese patent ZL 200720129828.2 discloses one and prevents round steel bar from scratching device.This patent is rolling friction by becoming sliding friction, avoids the scuffing on round steel surface, thus improves product quality and production efficiency.This patent solve rolled piece in Rolling Production process by auxiliary equipment scratch the crack defect that produces, but for paying close attention to the crack defect that rolling mill practice causes.Chinese patent ZL 200820076362.9 discloses a kind of roll pass structure avoiding large-size hot-rolled round steel surface to produce gauffer.The technical scheme that this patent adopts is: roughing mill first passage roll pass slot bottom width size B should meet the relation of B-b=3 ~ 5mm with the width dimensions b of the rear blank of heating.This patent notices the impact of rolling groove on rolled piece surface quality, but only considers the impact of roughing first passage.
For this reason, design a set of the breakdown pass system and the technique that are applicable to large rectangle base Rolling Production large-size round steel, to the production efficiency and lumber recovery improving product, there is very significant meaning.
Summary of the invention
In order to overcome the defect of prior art, the purpose of this utility model is to provide a kind of pass schedule avoiding large-size round steel face crack, the utility model by choose reasonable roughing mill breakdown pass system, thus to solve when producing large-size round steel with large rectangle continuous casting billet milling produce the problem of face crack.
The purpose of this utility model is achieved through the following technical solutions:
Avoid a pass schedule for large-size hot-rolled round steel face crack, it is characterized in that: this pass schedule comprises one group of n pass; Described n=3 ~ 5; The slot bottom width size of described 1st pass ~ the (n-1)th pass: b
kfollowing relation is met: b with the supplied materials width B entering this pass first
k/ B=1.030 ~ 1.045; The slot bottom width size b of described n-th pass
kfollowing relation is met: B-b with supplied materials width B
k=0 ~ 3mm; Described pass width of rebate B
krelation is met: B with the maximum b of rolled piece width and broadening surplus △ that go out this pass
k=b+ △; Described broadening surplus △ value is 5 ~ 12mm.
In the utility model, described roll gap S and roll diameter of roller D meets following relation: S=0.020 ~ 0.025D.Described pass height h
kwith width of rebate B
k, slot bottom width b
k, sidewall of pass gradient tan ψ and roll gap S meets following relation: h
k=(B
k-b
k)/tan ψ+S.Described angle of sides tan ψ value is between 10% ~ 30%.Described bottom land fillet R and pass height h
kmeet following relation: R=0.1 ~ 0.2 × h
k.Described notch fillet r and pass height h
kmeet following relation: r=0.05 ~ 0.15 × h
k.
The utility model is for the Surface Crack Problems occurred during the large-size round steel being φ 100 ~ φ 180mm with large rectangle continuous casting billet milling diameter, by drawing hot working chart and the flow of metal of simulation rough rolling process, find that the main cause that large-size round steel surface crack defect occurs is that the deformation characteristic of round steel surface metal particle is positioned at the Rheological Instability region of hot working chart.By pass schedule reasonable in design, the metal particle being in Rheological Instability region can be made to enter place of safety, thus effectively prevent the unstability of surface metal particle in the operation of rolling, avoid the generation of face crack.Adopt the utility model pass schedule obviously can improve the formation probability of large-size round steel face crack, effectively improve lumber recovery and the production efficiency of product.
Accompanying drawing explanation
Fig. 1 is the utility model mesothyrid and blank schematic diagram.
In figure, 1 is pass; 2 is the hot blank of access aperture type first.
Detailed description of the invention
Embodiment 1
Be φ 130mmSAE4137 large-size round steel with 320mm × 480mm rectangular bloom mill product specification, its breakdown pass system is: pass schedule is made up of pass I, pass II and pass III.The slot bottom width size b of its mesothyrid I and pass II
k1.043 and 1.033 are respectively with the ratio of the supplied materials width B entering this pass first.The slot bottom width size b of pass III
kbe 1mm with the difference of supplied materials width B.Pass width of rebate B
kmeet relation: B
k=b+ △.Wherein b is the maximum of the rolled piece width this pass.The broadening surplus △ of three passes is respectively 12mm, 5mm and 5mm.Roll gap S=0.021 × roll diameter of roller D.Pass height h
k=(width of rebate B
k-slot bottom width b
k)/sidewall of pass gradient tan ψ+roll gap S, wherein the value of three sidewall of pass gradient tan ψ is respectively 26.7%, 18.0% and 13.3%.Bottom land fillet R=0.13 × pass height h
k.Notch fillet r=0.010 × pass height h
k.Rolled piece turns over steel before entering roughing odd-numbered pass, and reduction in pass is respectively 80mm, 72mm, 50mm, 48mm, 68mm, 53mm and 44mm.
Embodiment 2
Be φ 150mm25MnCrNiMo large-size round steel with 320mm × 480mm rectangular bloom mill product specification, its breakdown pass system is: pass schedule is made up of pass I, pass II and pass III.The slot bottom width size b of its mesothyrid I and pass II
k1.043 and 1.033 are respectively with the ratio of the supplied materials width B entering this pass first.The slot bottom width size b of pass III
kbe 1mm with the difference of supplied materials width B.Pass width of rebate B
kmeet relation: B
k=b+ △.Wherein b is the maximum of the rolled piece width this pass.The broadening surplus △ of three passes is respectively 12mm, 5mm and 5mm.Roll gap S=0.021 × roll diameter of roller D.Pass height h
k=(width of rebate B
k-slot bottom width b
k)/sidewall of pass gradient tan ψ+roll gap S, wherein the value of three sidewall of pass gradient tan ψ is respectively 26.7%, 18.0% and 13.3%.Bottom land fillet R=0.13 × pass height h
k.Notch fillet r=0.010 × pass height h
k.Rolled piece turns over steel before entering roughing odd-numbered pass, and reduction in pass is respectively 80mm, 72mm, 50mm, 48mm, 68mm, 53mm and 44mm.
Adopt the utility model pass schedule obviously can improve the formation probability of large-size round steel face crack, effectively improve lumber recovery and the production efficiency of product.
Claims (3)
1. avoid a pass schedule for large-size hot-rolled round steel face crack, it is characterized in that: this pass schedule comprises one group of n pass; Described n=3 ~ 5; The slot bottom width size of described 1st pass ~ the (n-1)th pass: b
k following relation is met: b with the supplied materials width B entering this pass first
k / B=1.030 ~ 1.045; The slot bottom width size b of described n-th pass
k following relation is met: B-b with supplied materials width B
k =0 ~ 3mm; Described pass width of rebate B
k relation is met: B with the maximum b of rolled piece width and broadening surplus △ that go out this pass
k =b+ △; Described broadening surplus △ value is 5 ~ 12mm.
2. the pass schedule avoiding large-size hot-rolled round steel face crack according to claim 1, is characterized in that: described pass height h
k with width of rebate B
k , slot bottom width b
k , sidewall of pass gradient tan ψ and roll gap S meets following relation: h
k =(B
k -b
k )/tan ψ+S; Described angle of sides tan ψ value is between 10% ~ 30%.
3. the pass schedule avoiding large-size hot-rolled round steel face crack according to claim 1, is characterized in that: described bottom land fillet R and pass height h
k meet following relation: R=0.1 ~ 0.2 × h
k ; Described notch fillet r and pass height h
k meet following relation: r=0.05 ~ 0.15 × h
k .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420479445.8U CN204194425U (en) | 2014-08-22 | 2014-08-22 | A kind of pass schedule avoiding large-size round steel face crack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420479445.8U CN204194425U (en) | 2014-08-22 | 2014-08-22 | A kind of pass schedule avoiding large-size round steel face crack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204194425U true CN204194425U (en) | 2015-03-11 |
Family
ID=52652425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420479445.8U Withdrawn - After Issue CN204194425U (en) | 2014-08-22 | 2014-08-22 | A kind of pass schedule avoiding large-size round steel face crack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204194425U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209318A (en) * | 2014-08-22 | 2014-12-17 | 南京钢铁股份有限公司 | Pass system and roughing process for avoiding cracks on surface of large-size round steel |
| CN107030105A (en) * | 2017-05-10 | 2017-08-11 | 西宁特殊钢股份有限公司 | The milling method of cylindrical shape electroslag ingot with taper |
-
2014
- 2014-08-22 CN CN201420479445.8U patent/CN204194425U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209318A (en) * | 2014-08-22 | 2014-12-17 | 南京钢铁股份有限公司 | Pass system and roughing process for avoiding cracks on surface of large-size round steel |
| CN104209318B (en) * | 2014-08-22 | 2016-08-24 | 南京钢铁股份有限公司 | A kind of pass schedule avoiding large-size round steel face crack and roughing technique |
| CN107030105A (en) * | 2017-05-10 | 2017-08-11 | 西宁特殊钢股份有限公司 | The milling method of cylindrical shape electroslag ingot with taper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150311 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |