CN108296283A

CN108296283A - Ten passage anapsid bar rolling techniques

Info

Publication number: CN108296283A
Application number: CN201710019218.5A
Authority: CN
Inventors: 沐贤春; 卢勇; 蒲春雷; 徐亮; 余延庆
Original assignee: Huatian Engineering and Technology Corp MCC
Current assignee: Huatian Engineering and Technology Corp MCC
Priority date: 2017-01-11
Filing date: 2017-01-11
Publication date: 2018-07-20

Abstract

The present invention is a kind of ten passage anapsid bar rolling techniques, belongs to metal rolled technique, it is characterized in that：Bar continuous rolling Qian ten have concave roll be all made of flat-rolled roller replacement, by before bar ten passages have groove rolling using grooveless rolling replacement, using preceding ten passages grooveless rolling bar, rolling parameter is：The depth-width ratio of rolling is 0.90~1.8, every time reduction ratio is 20%~60%, the temperature of rolling is 950 DEG C~1100 DEG C, ranging from 150mm × 150mm~165mm × 165mm of the width of blank × high, the range 0.18~0.45 of absolute spread coefficient, realizes the grooveless rolling of ten passages before bar, reduces production cost, product quality and the utilization rate of milling train are improved, the accommodation of blank is expanded.

Description

Ten passage anapsid bar rolling techniques

Technical field

The invention belongs to metal rolled techniques, more particularly, to a kind of continuous rolling process of bar.

Background technology

Bar production is typically all using pass (also known as groove profile, similarly hereinafter) milling method, and pass schedule is by breakdown pass (six Road), elongation pass (six) and finishing groove (six) constitute；Slightly, rolled in pass generally by box-section strut (hole is also known as slot, under Together)-elliptical aperture composition, extends and finishing groove is generally elliptical aperture-circular hole system, the master rolled using this pass schedule It is that deformation comparison is uniform to want advantage, and the commonality of pass is preferable, and the transition of the section configuration of rolled piece in different passages is relatively more flat It is slow, it is not likely to produce local stress, the cooling of rolled piece is also relatively uniform, and this pass schedule has become the mainstream hole of rolling bar Type system and be widely used, but had the disadvantage that using groove rolling method：

1. using groove rolling method, it is necessary to be produced after slotting on new roll, the utilization rate of roll is low, rolls simultaneously Uneven and the sidewall of pass the influence of abrasion of slot makes the number of roll loaded vehicle reduce, and increases the consumption of roll, is produced into This is higher.

2. groove rolling method is used, due to the limitation that the sidewall of pass spreads rolled piece in the operation of rolling, if pass and rule The improper or screwdown gear of journey design adjusts improper or rolling temperature and mill speed fluctuation, easily occur over-filling, charge less is full and The problems such as pass misplaces influences the dimensional accuracy and surface quality of bar product the defects of causing the ears or side handles of a utensil, fold.

3. using groove rolling method, needs to change hole shutdown after groove abrasion, influence rolling rate.

4. using groove rolling method, since roll is slotted, reduce roll strength and rigidity, the accommodation of blank compared with It is narrow.

Invention content

The purpose of the present invention is to propose to a kind of ten passage anapsid bar rolling techniques, replace thering is pass to roll using flat-rolled roller Roller reduces production cost, improves the utilization rate of product quality and milling train, expands the accommodation of blank.

The object of the present invention is achieved like this：A kind of ten passage anapsid bar rolling techniques, it is characterized in that：Bar Tandem rolling Qian's ten have concave roll to be all made of the i.e. cylindrical smooth roll of flat-rolled roller to replace, and ten passages before bar are had Groove rolling is replaced using anapsid (also known as without groove profile) rolling, using preceding ten passages grooveless rolling bar, rolling parameter It is：It is 0.90~1.8 to roll the ratio between the height of depth-width ratio, that is, rolled piece and the width of rolled piece, and the rolling depth-width ratio is with 1.1 ~1.5 are preferred, and the ratio between the drafts of every time reduction ratio, that is, rolled piece and the former height of rolled piece are 20%~60%, and described Every time reduction ratio is preferred with 30%~55%, and rolling temperature is 950 DEG C~1100 DEG C, and the rolling temperature is with 1000 DEG C ~1050 DEG C are preferred, ranging from 150mm × 150mm~165mm × 165mm of the width of billet cross section × high, and the base Width × height of material cross section is preferred with 150mm × 150mm, and the range of the ratio of absolute spread coefficient, that is, absolute spread and drafts exists 0.10~0.45, and the absolute spread coefficient is preferred with 0.20~0.35, realizes the grooveless rolling of ten passages before bar.

Ten passage anapsid bar rolling techniques proposed by the invention solve it is following two theoretically there may be The problems in grooveless rolling process：1) stability of rolled piece is poor, twisted off-square phenomenon occurs, 2) to rolled piece in the operation of rolling Middle corner tipping rule is unclear, and product surface quality is affected.

The present invention by study flat rolling in rolled piece corner tipping rule, to due to during flat rolling side go out Existing cydariform (mainly twin drum), it is difficult to weigh its corner tipping with the curvature of corner circular arc, rolled piece corner tipping in the present invention Degree is quantified using corner tipping coefficient, by the research of numerical simulation and mill rolling practice, has grasped rolled piece in the operation of rolling In deformation rule, influence situation that during the rolling process may be to rolled piece surface quality is specified, by grooveless rolling mistake The controls such as the depth-width ratio of rolled piece, percentage pass reduction, rolling temperature in journey, it was demonstrated that the present invention applies feasible in bar production Property.

The advantageous effect of ten passage anapsid bar rolling techniques proposed by the invention is：

1) milling train year operating rate and productivity are improved：Since roll is anapsid, pressure can be changed by adjusting roll gap Regulation has saved roll changing time.

2) roll consumption and production cost are reduced：Due to using flat rolling, deformation of rolled wire is uniform, does not have roll surface speed Difference, thus the even wearing of roll, wear extent are smaller, the body of roll is improved without groove, the utilization rate of roll working surface, reduces roll Lathe quantity increases the recycling number of roll, and the storage capacity of roll is greatly lowered, and has saved the expense of roll.

3) lumber recovery is improved：Due to using flat rolling, the pressure of rolled piece width direction is uniform, make rolled piece both ends tongue, Fish tail region is shortened, and it is few to cut damage.

4) energy consumption is saved：Since roll is anapsid, without the restriction effect of hole shape side wall, rolled piece deforms in the width direction Uniformly, roll-force is reduced, electric energy has been saved.

5) heavy reduction rolling is realized：Since roll is anapsid, plain-barreled roll has compared with the strength and stiffness for having concave roll It is improved, increases billet size, or increase every time drafts, reduce rolling pass.

6) reduce product due to have groove rolling and generate over-fill, charge less is full and hole misplaces the problems such as appearance, gold The lateral flow of category increases, and is conducive to the update of rolled piece surface layer, rolled piece is free of surface defects, and heavy reduction makes rolled piece dense structure, property It can be good.

Ten passage anapsid bar rolling techniques proposed by the invention not only rational technology, easy to operate, operation is smooth, And production efficiency is high, and production process is stably and controllable, good product quality.

Ten passage anapsid bar rolling techniques proposed by the invention are made furtherly in conjunction with drawings and examples It is bright.

Description of the drawings

Fig. 1 is the rolling tipping index variation of rolled piece in ten passage anapsid bar rolling techniques proposed by the invention Figure.

Specific implementation mode

Embodiment：Product specification is the rolling of the screw-thread steel of φ 20mm, and steel grade is low-alloy steel, the width of billet cross section × A height of 150mm × 150mm, rolling temperature is 1050 DEG C, using ten passage anapsid bar rolling techniques proposed by the invention, The parameter of rolling is as follows：

The rolling parameter of ten passage anapsid tandem rollings see the table below：

The rolling parameter table of ten passage anapsid tandem rollings：

In ten passage anapsid tandem rollings, the corner tipping index variation profiles of rolled piece are shown in Fig. 1, in Fig. 1：Horizontal baseline is to roll Passage processed, left side vertical line are the corner tipping coefficient of rolled piece.

With this solution when rolled bar material, 10V rack biting to the 11H rack that has pass of the rolled piece from grooveless rolling Situation is normal, and the rolled piece section of preceding 10 passage outlet is stable as the case where groove rolling technique using having with original, and size is disconnected Face fully meets the rolling requirements of rear road unit, and rolling operation is smooth, and production efficiency is high, and production process is stably and controllable, product matter It measures.

Claims

1. a kind of ten passage anapsid bar rolling techniques, it is characterized in that：Bar continuous rolling Qian's ten has concave roll to adopt With flat-rolled roller it is that cylindrical smooth roll replaces, has groove rolling to be rolled without groove profile using anapsid ten passages before bar System replaces, and using preceding ten passages grooveless rolling bar, rolling parameter is：Roll the height and rolled piece of depth-width ratio, that is, rolled piece The ratio between width is 0.90~1.8, the ratio between former height of the drafts of every time reduction ratio, that is, rolled piece and rolled piece for 20%~ 60%, rolling temperature is 950 DEG C~1100 DEG C, ranging from 150mm × 150mm~165mm of the width of billet cross section × high × The range of the ratio of 165mm, absolute spread coefficient, that is, absolute spread and drafts ten passages before 0.18~0.45, realization bar Grooveless rolling.

2. according to ten passage anapsid bar rolling technique described in claim 1, it is characterised in that the rolling is high wide Than being 1.2~1.4.

3. according to ten passage anapsid bar rolling technique described in claim 1, it is characterised in that described every time Reduction ratio is 30%~50%.

4. according to ten passage anapsid bar rolling technique described in claim 1, it is characterised in that the rolling temperature is 1000 DEG C~1050 DEG C.

5. according to ten passage anapsid bar rolling technique described in claim 1, it is characterised in that the blank is transversal The width in face × a height of 150mm × 150mm.

6. according to ten passage anapsid bar rolling technique described in claim 1, it is characterised in that described absolutely spreads Coefficient is 0.25~0.35.