CN201186286Y

CN201186286Y - Roller caliber structure for avoiding goffer produced on surface of large size hot-rolling round steel

Info

Publication number: CN201186286Y
Application number: CNU2008200763629U
Authority: CN
Inventors: 齐建军; 陈连生; 席军良; 杨进航; 张志新; 陈红卫; 董国强
Original assignee: Shijiazhuang Iron and Steel Co Ltd
Current assignee: Shijiazhuang Iron and Steel Co Ltd
Priority date: 2008-02-28
Filing date: 2008-02-28
Publication date: 2009-01-28
Anticipated expiration: 2018-02-28

Abstract

The utility model relates to a roll pass structure which prevents the surface of large size hot-rolling round steel from generating gauffers, wherein the roll pass structure belongs to the rolled steel technical field and is used to solve the gauffer defect problem on the surface of the round steel. The technical scheme is that the width dimension B of the bottom of a first pass roll pass slot of an intermediate rolling mill and the width dimension b of heated billets should satisfy the following relation: B-b=3-5mm. The roll pass structure discovers a sticking point that the gauffers appear on the surface through field sampling and the finite element numerical simulation analysis to each rough rolling pass flow of metal, thereby, the width dimension of a first pass roll pass slot bottom structure is increased, which enables a pass slot bottom filleted corner to be transferred to the outside of a steel billet cross-section apical angle, and thereby the formation of the gauffers on the surface of rolled pieces can be effectively avoided. Practices prove that the gauffer defect on the surface can be avoided after adopting the roll pass structure and the surface quality of the large size hot-rolling round steel can be prominently improved, which is beneficial for enterprises to improve the economical benefits.

Description

A kind of roll pass structure of avoiding large-size hot-rolled round steel surface to produce gauffer

Technical field

The utility model relates to a kind of roll pass, especially for avoiding large-size hot-rolled round steel surface to produce the roughing mill first passage roll pass structure of gauffer, belongs to technical field of steel rolling.

Background technology

Along with the continuous progress of steel rolling technology, diameter can be produced by the mode of hot continuous rolling at the large-size round steel of 85～160mm at present.Compare with traditional forging mode, hot rolled circular steel production efficiency and product size precision all are improved.The continuous casting billet that the rolling employed blank of large-size round steel is rectangle or square cross-section, after the blank heating, through the roughing of multi-pass, in roll continuous rolling with finish rolling, finally obtain the finished product round steel.But,,, need to use big section rectangle or square steel billets as raw material in the production, and adopt bigger deflection to be rolled in order to guarantee former the expect compression ratio of finished product and the degree of increase distortion infiltration because the large-size round steel diameter is bigger.When rolling,, very easily cause the metal surface along occurring the pencil gauffer on the rolling direction because the restriction of roll pass will make metal produce differential deformation.In a single day gauffer occurs, follow-up rolling can not the elimination, and gauffer will remain into final round steel product surface, cause product surface quality defective, bring very big loss to enterprise.

Summary of the invention

The utility model is used to overcome the defective of prior art and provides a kind of and avoid large-size hot-rolled round steel surface to produce the roll pass structure of gauffer by the choose reasonable roughing mill first passage roll pass size.

The alleged problem of the utility model is solved by following technical scheme:

A kind of roll pass structure of avoiding large-size hot-rolled round steel surface to produce gauffer, its special feature is: the bottom land width dimensions B of the roughing mill first passage roll pass 1 and the width dimensions b of heating back blank 2 should satisfy following relation: B-b=3～5mm.

The above-mentioned roll pass structure of avoiding large-size hot-rolled round steel surface to produce gauffer, described pass 1 bottom land fillet R=15～30mm.

The utility model easily produces the problem of gauffer at large-size hot-rolled round steel surface, by in production scene sampling with to the analysis of finite element by numerical simulation of each roughing road minor metal deformation, the very crux that has found the large-size round steel surface ruffle to occur: i.e. the formation of initial gauffer occurs when rolling first in that rectangle or square cross-section steel billet are carried out, and just occurs in roughing first passage.The reason that causes wrinkle be roll pass to the straight drift angle place of blank depress deformation inhomogeneous due to.Therefore, the first passage roll pass bottom land dimension width is increased, make pass bottom land fillet transfer to the outside of steel billet section drift angle, so just can effectively avoid the formation of rolled piece surface ruffle.Facts have proved, can avoid the surface ruffle defective behind the pass structure that adopts the utility model to design, obviously improve large-size hot-rolled round steel surface quality, help enterprise and increase economic efficiency.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is blank and the pass schematic diagram when surface ruffle occurring before improving.

Each parts label is as follows among the figure: 1. the roughing mill first passage pass; 2. heat the back blank.

The specific embodiment

The utility model is by in production scene sampling with to the analysis of finite element by numerical simulation of each roughing road minor metal deformation, when having found that the large-size round steel surface ruffle occurs, initial gauffer occurs when rolling in that rectangle or square cross-section steel billet are carried out the first time, just in roughing first passage, occur, the particular location that gauffer occurs is near the side-walls four drift angles of blank section, the reason that produces is as shown in Figure 2: because the knuckle of pass bottom land is in the inside of blank, also be B＜b, cause when distortion to form the violent difference of two strands or multiply metal flow at the rolled piece sidewall, cause roll pass to the straight drift angle place of blank to depress deformation inhomogeneous.

At the problems referred to above, the utility model improves the roughing first passage pass structure, pass bottom land width is increased to beyond the blank drift angle, as shown in Figure 1: promptly the bottom land width dimensions B of pass 1 should satisfy following relation: B-b=3～5mm with the width dimensions b of heating back blank 2.Pass bottom land fillet R=15～30mm.

Other size of pass is as follows:

Pass width of rebate Bk=ψ % * (Hk-S)+the bottom land width B,

Sidewall of pass gradient ψ %=10-30%,

Pass height Hk=supplied materials height h-drafts,

Notch fillet R1=10-25mm,

Roll gap S=roller diameter D * 5-10%

Practice shows, according to above-mentioned amended pass structure processing roll again, and uses amended roll to produce, and promptly can avoid the appearance of large-size hot-rolled round steel surface ruffle.

Claims

1. avoid the surperficial roll pass structure that produces gauffer of large-size hot-rolled round steel for one kind, it is characterized in that: the bottom land width dimensions B of the roughing mill first passage roll pass (1) and the width dimensions b of heating back blank (2) should satisfy following relation: B-b=3～5mm.

2. the roll pass structure of avoiding large-size hot-rolled round steel surface to produce gauffer according to claim 1 is characterized in that: the bottom land fillet R=15～30mm of described pass (1).