CN108356073A - A kind of big standard round billet is to roll generation forging production method - Google Patents
A kind of big standard round billet is to roll generation forging production method Download PDFInfo
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- CN108356073A CN108356073A CN201810353211.1A CN201810353211A CN108356073A CN 108356073 A CN108356073 A CN 108356073A CN 201810353211 A CN201810353211 A CN 201810353211A CN 108356073 A CN108356073 A CN 108356073A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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Abstract
The present invention relates to a kind of big standard round billet to roll generation forging production method, mainly includes the following steps that：Step 1: breakdown pass designs：The pass of roughing is using flat hole, the combined pass in box hole and intermediate base finished hole；Step 2: 1) extend the heating time before roughing；2) it is to ensure that rolling stability, former reductions in pass are smaller；Increase drafts again below；3) tapping temperature is improved, rolling pass is reduced by adjusting drafts；Step 3: 1) the double radius ellipse type hole that finishing groove uses ratio of semi-minor axis length smaller before finished product；2) the use circular apertures of last groove are rolled：Step 3: 1) adjust position of the blank in stove, ensure the temperature difference of blank surface within 30 DEG C；2) control mode of roll cooling water is adjusted；3) clear assembling quality requirement, quantitative management ensure the assembling quality of tooling.The present invention realizes to roll generation forging, raising product competitiveness the improvement of rolling mill practice and the selection of design of section of rolling mill with design.
Description
Technical field
The invention belongs to metallurgy industry Bar Rolling Process fields, and in particular to a kind of big standard round billet is produced with rolling generation forging
Method, mainly for the production of the product of high compression ratio.
Background technology
Roughing is reciprocating rolling mill, is mainly based on intermediate base square billet, and 600 round billet material are rolled in roughing, existing master
Want problem：1. large round billet is easy to happen down steel, because the contact surface with roller-way, roll is all circular arc, and is not easy to help in rolling
It holds；2.600 circles heat in stove, such as heat it is bad, be easy between surface and center portion, portraitlandscape it is equal generate the larger temperature difference,
It is unfavorable to the uniformity controlling of deformation；3. due to the limitation of mill capacity, the drafts for rolling single pass is limited, the extension of material
Only on surface, center deformation is impermeable, easy tos produce surface folding for deformation；4. since blank is larger, to ensure intermediate base
Size, rolling pass is more, and blank temperature drop is larger, has a significant impact to finish rolling mill load.
In rolling bar there are one to compare distinct issues be exactly head-bent, this problem one is that be easy to cause rolling cold
Item, second is that aligning difficulty is bigger, bending range is smaller.Producing reason mainly has the following：1. blank is when heated, by
Position and the reason of burner heating location, cause steel billet to have temperature difference in machine and transverse direction in Yu Lu, in rolling due to
Elongation percentage difference causes to be bent；2. due to the position of cooling water, the cooling of abrasion and steel to roll all has an impact, and causes not
Same contact surface frictional force is different to be caused to be bent；It the control of tooling size and is rolled 3. because of the assembling quality of tooling, when rolling
The reasons such as the control of center line processed cause to be bent.
For the impact of current financial storm, steel market it is dispirited, for expand market, improve product competitiveness, two points
Factory's steel rolling passes through selection to roughing region and finish rolling region design of section of rolling mill and design and rolling mill practice with current existing equipment
Be further improved to make with 600 circles for blank, the 250 above larger products of circle of rolling meet the required compression of client
Than realizing to roll generation forging.
Invention content
The technical problem to be solved by the present invention is to provide a kind of big standard round billet for the above-mentioned prior art to roll generation forging
Production method, the selection of improvement and design of section of rolling mill to rolling mill practice, to realize to roll generation forging, expand market, carry with design
High product competitiveness.
Technical solution is used by the present invention solves the above problems：A kind of big standard round billet to roll generation forging production method,
This method mainly includes the following steps that：
Step 1: breakdown pass designs
The pass of roughing is using flat hole, the combined pass in box hole and intermediate base finished hole, then rolling in each pass
Every time drafts of mean allocation when processed finely tunes drafts in conjunction with hole molded dimension, finally rolls out intermediate base；
Step 2: roughing region rolling mill practice
1) extend the heating time before roughing, controlled according to >=14 hours, ensure to grill thoroughly when blank heating, additionally by tune
Whole burner valve opening, ensures the uniformity of furnace gas temperature, so that it is guaranteed that the uniformity of blank temperature；
2) when designing pass schedule, to ensure that rolling stability, former reductions in pass are smaller；Increase pressure again below
Amount, while by operating manipulator, blank is helped in rolling, prevents down steel；
3) tapping temperature is improved, rolling pass is reduced by adjusting drafts, ensures finish rolling start rolling temperature；
Step 3: finishing groove designs
1) the double radius ellipse type hole that finishing groove uses ratio of semi-minor axis length smaller before finished product；
2) the use circular apertures of last groove are rolled：
Step 3: finish rolling rolling mill practice
1) position of the adjustment blank in stove uses pulse-combustion using interfix and burner heating, ensures blank
The temperature difference on surface is within 30 DEG C；
2) control mode of roll cooling water is adjusted, the specific cooling water that controls opens and closes the time, ensures roll cooling
Uniformly；
3) clear assembling quality requirement, quantitative management ensure the assembling quality of tooling.
Preferably, when roughing rolls for guarantee rolling stability, the maximum reduction of former passages at each pass
Control is in 30mm；The maximum reduction of several passages is controlled in 60mm afterwards.
Preferably, when roughing rolls, High temperature diffusion temperature is increased to 1250 ± 10 DEG C by original 1240 ± 10 DEG C, essence
Start rolling temperature control is rolled at 1070-1150 DEG C.
Preferably, pass the slot bottom width bK=Bmm, B in box hole are supplied materials width, pass width of rebate BK=bK+
△, depth of groove h=D-d, D are roll original roller diameter, and d is roll work roller diameter, and △ is the absolute value of allowed minus deviation, inner circle
Angular radius R=(0.1~0.25) h, round radius r are more than fillet radius R.
Preferably, intermediate base finished hole is box hole, and pass slot bottom width bK=Bmm, B are supplied materials width, pass notch
Width BK=bK+ △, depth of groove h=D-d, D are roll original roller diameter, and d is roll work roller diameter, and △ is allowed minus deviation
Absolute value, fillet radius R=(0.1~0.25) h, round radius r are more than fillet radius R.
Preferably, double radius ellipse type hole size is as follows：
Oval groove height：Hk=(0.88~0.96) D,
Oval groove width：Bk=(1.23~1.50) D,
Gullet radius：R1=(1.05~1.4) bk,
Roundlet arc radius：R2 ＜ (hk-S)/2,
Outer rounding radii：R=(0.05-0.12) bk,
Gap values between rollers：S=(0.01-0.2) Dt
D --- --- cold conditions nominal diameter；
Dt --- --- roller diameter.
Preferably, the size of finish rolling finished hole is：Last groove base circle diameter (BCD)：Hk=[D- (0~1.0) △] n,
Last groove extends circular diameter：B=[D+ (0.5~1.0) △] n,
Gap values between rollers：S=(0.01-0.2) Dt,
The angle of flare：A value ranges (15 ° -30 °),
Base radius：R=hk ÷ 2,
Bull nose r ＞ 5mm,
In formula：D --- --- cold conditions nominal diameter,
Dt --- --- roller diameter,
The absolute value of △ --- --- allowed minus deviation；
N --- --- coefficient of thermal expansion.
Preferably, the specific control mode of roll cooling water is, into stove after 4-7s open cooling water, 4-7s is closed before coming out of the stove
Cooling water.
Preferably, in the roughing region rolling mill practice stage, former passages are rolled using flat hole, then use flat hole and
The alternate mode in box hole rolls, and is rolled finally by intermediate base hole, it is ensured that is preferably minimized in finish rolling stage rolling number.
Compared with the prior art, the advantages of the present invention are as follows：
1) 350 circles, 300 circles are rolled into existing blank 390*510 at present, compression ratio only has 2.1,2.8, and customer requirement
Product compression ratio is at least up to 3, so in conjunction with company's big specification continuous casting billet newly developed, therefore 600 circle continuous casting of blank positioning
Base.It disclosure satisfy that the product compression ratio of customer requirement in this way.
2) heating and roughing region rolling mill practice：1. extending heating time, ensure to grill thoroughly when blank heating, in addition same cross is grasped
It adjusts, ensure that the uniformity of blank temperature；2. when designing pass schedule, ensure rolling stability, former reductions in pass
It is smaller, behind increase drafts again, while by operating manipulator, blank is helped in rolling, it is therefore prevented that the feelings of falling steel
The generation of condition；3. improving tapping temperature, rolling pass is reduced by adjusting drafts as possible, ensures finish rolling start rolling temperature；4. protecting
The uniformity of rolling deformation and the comprehensive benefit of work roll cooling are demonstrate,proved.
3) what subsidiary factory took solves the corrective measure of head-bent：1. by adjusting position of the blank in stove and burning
The mode of mouth heating, ensure that the temperature difference of blank surface within 30 DEG C；2. the position by adjusting roll cooling water and control
Mode processed ensure that roll cooling is uniform；3. the clear assembling quality requirement such as pair roll, guide and guard, quantitative management ensure that tooling
Assembling quality.
Description of the drawings
Fig. 1 is the design of section of rolling mill of roughing region 2 of the embodiment of the present invention.
Fig. 2 is the design of section of rolling mill of roughing region 3 of the embodiment of the present invention.
Fig. 3 is double radius ellipse pass before the finish rolling region finished product of the embodiment of the present invention.
Fig. 4 is the finish rolling region last groove of the embodiment of the present invention.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
The present invention relates to a kind of big standard round billet to roll generation forging production method, and this method includes mainly the following contents：
Step 1: breakdown pass designs
1.1, the selection of blank
Larger product is mainly used should be in machine industries such as oil field tool steel, large-scale motor shafts, to round steel product
Mechanical property requirements it is especially high, it is therefore necessary to consider the compression ratio of product, and existing blank 390*510 is such as rolled into 350
Circle, 300 circles, compression ratio only has 2.1,2.8, and customer requirement product compression ratio is at least up to 3, so in conjunction with big specification continuous casting
Base, 600 circle continuous casting billet of blank positioning.
1.2, breakdown pass design and intermediate base size
Roughing is reciprocating rolling mill, is mainly based on intermediate base square billet, 600 round billet material existing master when roughing rolls
Want problem：1, large round billet is easy to happen down steel, because the contact surface with roller-way, roll is all circular arc, and is not easy to help in rolling
It holds；2,600 circles heat in stove, such as heat it is bad, be easy between surface and center portion, portraitlandscape it is equal generate the larger temperature difference,
It is unfavorable to the uniformity controlling of deformation；3, due to the limitation of mill capacity, the drafts for rolling single pass is limited, the extension of material
Only on surface, center deformation is impermeable, easy tos produce surface folding for deformation；4, since blank is larger, to ensure intermediate base
Size, rolling pass is more, and blank temperature drop is larger, has a significant impact to finish rolling mill load；In view of the above-mentioned problems, technological design
Mainly consider from following several respects：
1, extend heating time, controlled according to >=14 hours, ensure to grill thoroughly when blank heating, additionally by adjustment burner valve
Aperture ensures the uniformity of furnace gas temperature, so that it is guaranteed that the uniformity of blank temperature；
2, when designing pass schedule, to ensure rolling stability, former reductions in pass are smaller, maximum reduction control
In 30mm；Increase drafts again below, maximum reduction is controlled in 60mm, while by operating manipulator, in rolling to blank
It is helped, prevents down steel；
3, tapping temperature is improved, High temperature diffusion temperature is increased to 1250 ± 10 DEG C by original 1240 ± 10 DEG C, logical as possible
The whole drafts of toning reduces rolling pass, ensures the control of finish rolling start rolling temperature at (1070-1150) DEG C；
4, it is the comprehensive benefit of the uniformity and work roll cooling of guarantee rolling deformation, the principle of hole type design is as follows；
1) commonality for considering pass, is mainly adjusted by roll gap and shuts out that size is different to roll (referring in particular to pass schedule)
Part reduces roll change number, improves the operating rate of milling train；
2) keep deformation of rolled wire uniform, reduce the abrasion of pass；Therefore the pass of roughing mainly uses box pass, then puts down
The drafts for distributing every time finely tunes drafts in conjunction with hole molded dimension, finally rolls out intermediate base.Intermediate base and finished product
Corresponding table such as the following table 2：
| Serial number | Intermediate base size | Finished size |
| 1 | 365*365 | φ350 |
| 2 | 330*320 | φ300 |
| 3 | 320*320 | 250~φ of φ 260 |
Table 2
The principle that intermediate base size determines is mainly：1, the deflection of finishing rolling step is reduced to the greatest extent；2, ensure finishing rolling step
Deformation it is abundant；The size of base size determines among the size Main Basiss of breakdown pass, introduces roughing by taking 300 circles as an example below
Pass：First billet size be 600 circle, rolled piece width is larger, for avoid rolling when, generate wire drawing, steel-fastening the problems such as, so
The 600 former passages of circle are rolled using flat hole, and No. 3 holes are flat hole pass, consider it is shared with blank 390*510, so No. 1 (such as
Fig. 1) elongated hole uses box hole, and pass slot bottom width bK=Bmm, B are supplied materials width, bK=390mm, pass width of rebate BK
=bK+ △, BK=450mm, depth of groove h=D-d, D are roll original roller diameter 1100mm, and d is roll work roller diameter 985mm, h
=115mm, the main pressure ability considered according to supplied materials height and milling train, fillet radius R=(0.1~0.25) h=25mm,
Round radius r is more than fillet radius R, r=45mm, and blank will not contact bull nose in actual mechanical process, still
It prevents from causing blank surface to be damaged because of acute angle contact surface, therefore carries out lead angle to form bull nose.
Main consideration rolled piece easily causes on collars to be chewed, and leads to surface defect, therefore bull nose amplifies one compared to filleted corner
(r45mm ＞ r25mm) a bit.Similarly, No. 2 holes are intermediate base finished hole, and intermediate base finished hole is also box hole, according to by No. 3
Supplied materials after flat hole and the rolling of No. 1 box hole is determined its size, it is contemplated that public property so, pass slot bottom width bK=
Bmm, B are supplied materials width, and bK=310mm, pass width of rebate BK=bK+ △, BK=350mm, depth of groove h=D-d, D are
Roll original roller diameter 1100mm, d are roll work roller diameter 985mm, h=115mm, fillet radius R=(0.1~0.25) h=
25mm, round radius r are more than fillet radius R, r=30mm, specific following Fig. 2 of figure.It is to be rolled with 600 round billets below
The roughing pass schedule of 330*320：
Big stick-means of intimidation 330 × 320mm of roughing pass schedules (600 circular hole)
19 passages are rolled altogether, and wherein 8 passage of flat hole groove rolling, 8 passage of box hole groove rolling, finished hole pass rolls
3 passages are made, start rolling based on flat hole pass, centre is carried out in such a way that flat hole and box hole are alternate, finally with centre
Base hole is rolled.
Step 2: finishing groove designs
Finish rolling milling train is to found flat alternative expression, and the principle of hole type design is：1, deformation is uniform, and pass collocation is uniform, it is ensured that rolls
The surface quality of part；2, ensure that deformation is abundant, spread enough；By taking 300 circles as an example, pass schedule is double radius ellipse type hole-circle
Hole.
2.1, double radius ellipse type hole
Use double radius ellipse type hole before finished product, the ellipse long and short shaft of double radius ellipse type hole it is smaller, i.e. pass is high
Spend it is larger, spread it is smaller, be particularly suitable for guide and guard require it is not stringent in the case of, deformation of rolled wire and pass collocation are more uniform, at
Product surface quality is preferable, at the same big specification spread it is smaller, to ensure spreading enough for finished product, the elliptical aperture height phase before finished product
To larger, pass is more full, specific size such as Fig. 3.300, which justify the holes K2 molded dimensions, is：
Oval groove height：Hk=(0.88~0.96) D, takes hk=290mm,
Oval groove width：Bk=(1.23~1.50) D, takes bk=370mm,
Gullet radius：R1=(1.05~1.4) bk, takes R1=480mm,
Roundlet arc radius：R2 ＜ (hk-S)/2, take R2=65mm,
Outer rounding radii：R=(0.05-0.12) bk, take r=20mm.
Gap values between rollers：S=(0.01-0.2) Dt, takes S=85mm
D --- --- cold conditions nominal diameter；
Dt --- --- roller diameter takes 760；
2.2, last groove
The design of last groove mainly considers from the following aspects:1. the variation of rolling temperature；2. the variation of absolute spread；
3. the requirement of dimensional tolerance；4. the abrasion of pass：Last groove is as shown in Figure 4.300mm round steel last groove sizes are:
Last groove base circle diameter (BCD)：Hk=[D- (0~1.0) △] n=(300-0x1.3) x1.013=304mm,
Last groove extends circular diameter：B=[D+ (0.5~1.0) △] n=(300+1x 4.5) x1.013=308.5m
M,
Gap values between rollers：S=(0.01-0.2) Dt, takes S=10mm,
The angle of flare：A general ranges value (15 ° -30 °), takes 16 °,
Base radius：R=hk ÷ 2=152mm,
It is main to consider that rolled piece easily causes on collars and chews, lead to surface defect, therefore bull nose r ＞ 5mm, take r=8mm.
In formula：D --- --- cold conditions nominal diameter, takes 300；
Dt --- --- roller diameter takes 760；
The absolute value of △ --- --- allowed minus deviation；
N --- --- coefficient of thermal expansion takes 1.013；
Step 3: finish rolling rolling mill practice
Pass schedule such as the following table 3 of 300 circle of base rolling among the roughing of 330*320 of 760 milling trains：
Table 3
In rolling bar there are one to compare distinct issues be exactly head-bent, this problem one is that be easy to cause rolling cold
Item, second is that aligning difficulty is bigger, bending range is smaller.Producing reason mainly has the following：1, blank when heated, by
Position and the reason of burner heating location, cause steel billet to have temperature difference in machine and transverse direction in Yu Lu, in rolling due to
Elongation percentage difference causes to be bent；2, due to the position of cooling water, the cooling of abrasion and steel to roll all has an impact, and causes not
Same contact surface frictional force is different to be caused to be bent；It the control of tooling size and is rolled 3. because of the assembling quality of tooling, when rolling
The reasons such as the control of center line processed cause to be bent；Following corrective measure is mainly taken for above-mentioned reason subsidiary factory：
1, the position by adjusting blank in stove, the mode heated using interfix and burner, is fired using pulse
It burns, ensures the temperature difference of blank surface within 30 DEG C；
2, by adjusting the control mode of roll cooling water, the time (4-7 seconds) is opened and closed using optimal cooling water,
Ensure that roll cooling is uniform；
3, to the clear assembling quality requirement such as roll, guide and guard, quantitative management ensures the assembling quality of tooling.
The foregoing is merely a kind of preferable implementations of the present invention, are not intended to limit the invention, all in this hair
Non-essential modification, replacement, improvement for being made in bright spirit etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of big standard round billet is to roll generation forging production method, it is characterised in that：This method mainly includes the following steps that：
Step 1: breakdown pass designs
The pass of roughing is using flat hole, the combined pass in box hole and intermediate base finished hole, then in the rolling of each pass
Every time drafts of mean allocation finely tunes drafts in conjunction with hole molded dimension, finally rolls out intermediate base；
Step 2: roughing region rolling mill practice
1) extend the heating time before roughing, controlled according to >=14 hours, ensure to grill thoroughly when blank heating, be burnt additionally by adjustment
Mouth valve opening ensures the uniformity of furnace gas temperature, so that it is guaranteed that the uniformity of blank temperature；
2) when designing pass schedule, to ensure that rolling stability, former reductions in pass are smaller；Increase drafts again below,
Simultaneously by operating manipulator, blank is helped in rolling, prevents down steel；
3) tapping temperature is improved, rolling pass is reduced by adjusting drafts, ensures finish rolling start rolling temperature；
Step 3: finishing groove designs
1) the double radius ellipse type hole that finishing groove uses ratio of semi-minor axis length smaller before finished product；
2) the use circular apertures of last groove are rolled：
Step 3: finish rolling rolling mill practice
1) position of the adjustment blank in stove uses pulse-combustion using interfix and burner heating, ensures blank surface
Temperature difference within 30 DEG C；
2) control mode of roll cooling water is adjusted, the specific cooling water that controls opens and closes the time, ensures that roll cooling is uniform；
3) clear assembling quality requirement, quantitative management ensure the assembling quality of tooling.
2. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：It is rolled in roughing
When for ensure rolling stability, at each pass former passages maximum reduction control in 30mm；The maximum of several passages afterwards
Drafts is controlled in 60mm.
3. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：It is rolled in roughing
When High temperature diffusion temperature be increased to 1250 ± 10 DEG C by original 1240 ± 10 DEG C, finish rolling start rolling temperature is controlled in 1070-1150
℃。
4. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：The hole in box hole
Type slot bottom width bK=Bmm, B are supplied materials width, and pass width of rebate BK=bK+ △, depth of groove h=D-d, D are that roll is former
Beginning roller diameter, d are roll work roller diameter, and △ is the absolute value of allowed minus deviation, fillet radius R=(0.1~0.25) h, outer circle
Angular radius r is more than fillet radius R.
5. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：Intermediate base finished product
Hole is box hole, and pass slot bottom width bK=Bmm, B are supplied materials width, pass width of rebate BK=bK+ △, depth of groove h=
D-d, D are roll original roller diameter, and d is roll work roller diameter, and △ is the absolute value of allowed minus deviation, fillet radius R=(0.1
~0.25) h, round radius r are more than fillet radius R.
6. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：Double radius ellipse
Type hole size is as follows：
Oval groove height：Hk=(0.88~0.96) D,
Oval groove width：Bk=(1.23~1.50) D,
Gullet radius：R1=(1.05~1.4) bk,
Roundlet arc radius：R2 ＜ (hk-S)/2,
Outer rounding radii：R=(0.05-0.12) bk,
Gap values between rollers：S=(0.01-0.2) Dt
D --- --- cold conditions nominal diameter；
Dt --- --- roller diameter.
7. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：Finish rolling finished hole
Size be：Last groove base circle diameter (BCD)：Hk=[D- (0~1.0) △] n,
Last groove extends circular diameter：B=[D+ (0.5~1.0) △] n,
Gap values between rollers：S=(0.01-0.2) Dt,
The angle of flare：A value ranges (15 ° -30 °),
Base radius：R=hk ÷ 2,
Bull nose r ＞ 5mm,
In formula：D --- --- cold conditions nominal diameter,
Dt --- --- roller diameter,
The absolute value of △ --- --- allowed minus deviation；
N --- --- coefficient of thermal expansion.
8. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：Roll cooling water
Specific control mode be, into stove after 4-7s open cooling water, before coming out of the stove 4-7s close cooling water.
9. a kind of big standard round billet according to claim 1 is to roll generation forging production method, it is characterised in that：In roughing region
Rolling mill practice stage, former passages are rolled using flat hole, are then rolled using the alternate mode of flat hole and box hole, finally
It is rolled by intermediate base hole, it is ensured that be preferably minimized in finish rolling stage rolling number.
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| CN112170480A (en) * | 2020-09-10 | 2021-01-05 | 宝钢特钢韶关有限公司 | Method for improving rolling of H13 steel grade and H13 round steel |
| CN112371720A (en) * | 2020-09-25 | 2021-02-19 | 江苏省沙钢钢铁研究院有限公司 | Production method for improving surface quality of wire rod |
| CN113000607A (en) * | 2021-02-20 | 2021-06-22 | 广东韶钢松山股份有限公司 | Control method for cold heading performance stability of ultra-low carbon steel CH1T |
| CN113333465A (en) * | 2021-06-11 | 2021-09-03 | 陈歌 | Rolling method for rolling sector plate by blooming mill and hole pattern system used by same |
| CN115069765A (en) * | 2022-06-13 | 2022-09-20 | 张家港荣盛特钢有限公司 | Processing method for continuous cogging of bloom and intermediate billet processed by processing method |
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| CN110653276A (en) * | 2019-09-06 | 2020-01-07 | 北京科技大学 | Rolling method for small-compression-ratio compaction welding porosity defect of large-size bar |
| CN112170480A (en) * | 2020-09-10 | 2021-01-05 | 宝钢特钢韶关有限公司 | Method for improving rolling of H13 steel grade and H13 round steel |
| CN112371720A (en) * | 2020-09-25 | 2021-02-19 | 江苏省沙钢钢铁研究院有限公司 | Production method for improving surface quality of wire rod |
| CN112371720B (en) * | 2020-09-25 | 2022-04-19 | 江苏省沙钢钢铁研究院有限公司 | Production method for improving surface quality of wire rod |
| CN113000607A (en) * | 2021-02-20 | 2021-06-22 | 广东韶钢松山股份有限公司 | Control method for cold heading performance stability of ultra-low carbon steel CH1T |
| CN113000607B (en) * | 2021-02-20 | 2022-03-11 | 广东韶钢松山股份有限公司 | Control method for cold heading performance stability of ultra-low carbon steel CH1T |
| CN113333465A (en) * | 2021-06-11 | 2021-09-03 | 陈歌 | Rolling method for rolling sector plate by blooming mill and hole pattern system used by same |
| CN115069765A (en) * | 2022-06-13 | 2022-09-20 | 张家港荣盛特钢有限公司 | Processing method for continuous cogging of bloom and intermediate billet processed by processing method |
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