CN102407236B - Machining and manufacturing method of steel plate of die steel - Google Patents
Machining and manufacturing method of steel plate of die steel Download PDFInfo
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- CN102407236B CN102407236B CN201010287882.6A CN201010287882A CN102407236B CN 102407236 B CN102407236 B CN 102407236B CN 201010287882 A CN201010287882 A CN 201010287882A CN 102407236 B CN102407236 B CN 102407236B
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Abstract
The invention discloses a machining and manufacturing method of a steel plate of die steel, comprising the following steps of: firstly, producing a steel ingot of the die steel through die casting, wherein the steel ingot of the die steel is a fillet flat ingot; secondly, heating the steel ingot by a heating furnace, controlling the temperature of the furnace not to be higher than 650 DEG C when the steel ingot is placed in the furnace, raising the temperature of the steel ingot along with the furnace, at least preserving the temperature of 650 DEG C for 2 hours, then raising the temperature, continuously preserving the temperature for at least 2 hours after the temperature is up to 1150+/-30 DEG C, and then taking the steel ingot out of the furnace; thirdly, rolling the steel ingot taken out of the furnace into an intermediate blank, cutting off a dead head of the intermediate blank and polishing the intermediate blank; fourthly, heating the polished intermediate blank with the same heating system as the second step and taking the polished intermediate blank out of the furnace; and fifthly, carrying out rolling in three stages including molding rolling, widening rolling and finish rolling on the intermediate blank taken out of the furnace to manufacture the steel plate of the die steel. By using the machining and manufacturing method of the steel plate of the die steel, the production efficiency and the yield are increased, the size and the shape of the machined plate have the precision which is not possessed by using the traditional method, and the method is easy to realize industrial application.
Description
Technical field
The present invention relates to a kind of machining manufacture of special steel sheet material, particularly a kind of machining manufacture for the higher steel plate of die steel of alloy content.
Background technology
In general, special steel is to have special chemical composition (alloying), adopt special explained hereafter, possess special tissue and performance, can meet the steel class of special requirement, and mould steel belong to a wherein class.Compare with ordinary steel, mould steel has higher obdurability, physical property, chemical property, biocompatibility and processing performance.But also just because of this difference of its material behavior and other steel grade, it is can processing temperature space often narrower, and resistance of deformation is extremely responsive to temperature, and resistance of deformation Changing Pattern is complicated; The capacity of heat transmission is poor, and intensification and cooling are all very slow, and the distortion heat of deformation process can cause workpiece to have larger temperature rise, thereby affects process.
The technique that the processing of steel plate of die steel adopts die casting to add forging more completes, process-cycle is long, lumber recovery is lower, if and the conventional hot-rolling method of finished product that is directly rolled to by blank that adopts that ordinary steel adopts, cannot guarantee that again rolled piece is in the middle of process remains on applicable temperature range, problem of Cracking is serious, therefore the processing and manufacturing of steel plate of die steel is the technology difficult point that line is produced in alloy sheet strip hot rolling in the world always.
Summary of the invention
For addressing the above problem, the invention provides a kind of machining manufacture of steel plate of die steel, narrow for mould steel processing temperature space, the feature such as resistance of deformation Changing Pattern complexity reduces the ratio of defects occurring in producing, and obtains from geomery, to properties of product, all meets the steel plate of die steel of actual product requirement.
For achieving the above object, the machining manufacture of steel plate of die steel of the present invention, comprises the following steps:
Step 4, intermediate blank after reconditioning is adopted to heating furnace heating, during steel ingot shove charge, furnace temperature, not higher than 650 ℃, heats up with stove, and is at least incubated after 2 hours in the time of 650 ℃, then heat up, and arrives after 1150 ± 30 ℃, continues insulation at least 2 hours, comes out of the stove afterwards;
Preferably, the Rolling from Ingot described in described step 3 is made the mode rolling that intermediate blank employing steel ingot microcephaly is introduced into milling train.
The machining manufacture of steel plate of die steel of the present invention has changed traditional pattern that adds forging steel plate of die steel with die casting, can can the narrower feature in processing temperature interval for mould steel, overcome the technology difficult points such as the easy cracking of its process, production efficiency and lumber recovery have not only been improved, and the board dimension shape of processing has the precision that conventional method does not possess, and prolongable thickness specification, can realize continuous high-efficient simultaneously and produce, be easy to commercial Application.
Accompanying drawing explanation
Fig. 1 is the flow chart of the machining manufacture of steel plate of die steel of the present invention;
Fig. 2 is the schematic perspective view of the square slab ingot of routine;
Fig. 3 is the schematic perspective view of fillet slab ingot of the present invention.
The specific embodiment
Fig. 1 is the flow chart of the machining manufacture of steel plate of die steel of the present invention, and the machining manufacture of steel plate of die steel of the present invention comprises the following steps: die casting fillet slab ingot (S1), Heating Steel Ingots (S2), steel ingot disappear, and tapering is rolling to intermediate blank (S3), intermediate blank heating (S4), intermediate blank is rolling to target size (S5).The impact of the ingot shape that first the present invention considers mould steel steel ingot on subsequent handling and final finished, designs die casting ingot shape, afterwards for material behavior, and design heating cycle and rolling procedure.
One, the design of die casting ingot shape (S1)
Fig. 2 is the schematic perspective view of the square slab ingot of routine, and the ingot shape that the machining of conventional steel plate adopts is conventionally by being molded into square slab ingot as shown in Figure 1, the slab ingot that namely transverse shape is rectangle.Static ingot has certain tapering so that the demoulding, and as shown in Figure 1, square slab ingot includes steel ingot microcephaly 1, steel ingot major part 2 and rising head 3.
Because the cooling surface area of slab ingot is larger than other ingot shape, good heat dissipation effect, has increased the thickness of steel ingot chill, reduces hot tearing sensitiveness, reduces segregation simultaneously and improves eutectic carbonization; On the other hand, square slab ingot adds that the excessive limit causing of temperature drop, Bian Bu, in man-hour bight is split, chink being rolled.The present invention is directed to mould steel can the narrower feature of processing temperature scope, select limit portion be the fillet slab ingot of circular arc as die casting ingot shape, can avoid square slab ingot to add that the excessive limit causing of temperature drop, Bian Bu, in man-hour bight is split, chink being rolled.
The present invention is first by die casting production mould steel ingot, and described mould steel steel ingot is fillet slab ingot, and the both sides in the cross section of described fillet slab ingot are circular-arc.Fig. 3 is the schematic perspective view of fillet slab ingot of the present invention, and as shown in the figure, fillet slab ingot refers to that the both sides in the cross section of slab ingot are circular-arc, and namely the upper and lower surface of fillet slab ingot is plane, and two sides are taper seat.Described fillet slab ingot includes steel ingot microcephaly 10, steel ingot major part 20 and rising head 30.
Two, heating cycle design (S2)
Mould steel thermal conductivity factor is low, especially in the low-temperature zone lower than 650 ℃, heats up slower, while therefore adopting heating furnace heating, in order to make steel ingot core and surface temperature even, furnace temperature during steel ingot shove charge should be higher than 650 ℃, with stove, heat up, and be at least incubated 2 hours in the time of 650 ℃; Continue afterwards to heat up, set 1150 ± 30 ℃ of start rolling temperatures, arrive warm follow-up continuation of insurance temperature at least 2 hours, make steel ingot bulk temperature even, come out of the stove afterwards.
Three, rolling procedure design
Can processing temperature interval narrower and steel ingot self rising head is large, the more feature of impurity based on mould steel, rolling is divided into twice and carries out, first from Rolling from Ingot, make intermediate blank (S3), cut away afterwards rising head and carry out reconditioning, reheat (S4), be again rolling to target thickness (S5).
From Rolling from Ingot, making intermediate blank (S 3), when eliminating tapering, the mode that can adopt steel ingot major part 20 to be introduced into milling train is rolled, and also can adopt steel ingot microcephaly 10 to be introduced into the mode rolling of milling train.
Because steel ingot is with certain taper, as shown in Figure 3, if be namely introduced into milling train from rising head 30 sides from steel ingot major part 20 1 sides, although contribute to improve breaking down billet yield, but for the larger large substance steel ingot of thickness tapering, when rolling just starts, the roll-force that in each passage, rolled piece is subject to reduces gradually, while approaching afterbody, depart from topping roll completely, rolled piece stress balance is broken suddenly, causes the unstable of rolling, is prone to the production problems such as steel-fastening.Therefore, before the tapering of steel ingot is eliminated, the mode that employing is introduced into milling train from steel ingot microcephaly 10 is rolled, and each passage is set drafts by point of maximum thickness; After tapering is eliminated, by meeting maximum bite condition and torque capacity, limit to distribute drafts, in even-numbered pass, by edger roll, compensate rolled piece flat shape is controlled, and whole process using is along rolling, do not turn steel, with minimum passage, be rolled to the target thickness of intermediate blank.
Be rolled into after described intermediate blank, by the rising head excision of intermediate blank, and intermediate blank carries out reconditioning, and reconditioning comprises carries out reconditioning to upper and lower surface, limit portion.After reconditioning completes, again according to the heating cycle of above-mentioned mould steel steel ingot, heat, that is: adopt heating furnace to heat, during intermediate blank shove charge, furnace temperature, not higher than 650 ℃, heats up with stove, and be at least incubated 2 hours in the time of 650 ℃, continue to heat up, after arriving 1150 ± 30 ℃, continue insulation at least 2 hours, come out of the stove afterwards.
After intermediate blank is come out of the stove, to intermediate blank, adopt roll forming, broadening rolling, finish rolling rolling three phases to be rolled, make steel plate of die steel, meet shape of product, dimensional requirement and plate shape target.Described roll forming, broadening rolling, finish rolling rolling three phases are identical with the above-mentioned three stage rolling processes of conventional sheet material.
Below look unfamiliar produce mould steel Cr12MoV, Cr5Mo1V steel plate is embodiment, enforcement of the present invention is remarked additionally.
1, the design of die casting ingot shape
The chemical composition of mould steel Cr12MoV, Cr5Mo1V that embodiment adopts is respectively in Table 1 and table 2:
Table 1Cr12MoV chemical composition (unit: wt%)
| C | Co | Cr | Mn | Mo | P | S | Si | V |
| 1.50 | 1.00 | 12.00 | 0.3 | 0.80 | 0.03 | ≤0.03 | 0.25 | 0.60 |
Table 2Cr5Mo1V chemical composition (unit: wt%)
| C | Cr | Mn | Mo | P | S | Si | V |
| 1.0 | 5.0 | 0.60 | 1.0 | 0.030 | 0.030 | 0.25 | 0.25 |
Adopt the fillet slab ingot ingot shape shown in Fig. 3 to pour into a mould, the both sides in the cross section of described fillet slab ingot are circular-arc.The fillet slab ingot of cast is of a size of length 1890mm, the wide 1190mm of microcephaly, thick 275mm; Large head breadth 1220mm, thick 350mm; The long 250mm of rising head, thick 285mm, wide 1130mm.
2, heating cycle design
During steel ingot shove charge, furnace temperature, not higher than 650 ℃, heats up with stove; And be at least incubated 2 hours in the time of 650 ℃, and continue to heat up, after steel ingot internal and external temperature is even, can suitably accelerate firing rate, arrive after 1150 ± 30 ℃, continue insulation at least 2 hours, come out of the stove afterwards.
3, rolling procedure design
The 3.1 steel ingots tapering that disappears is rolled into intermediate blank
For Cr12MoV:
Before the tapering of Cr12MoV steel ingot is eliminated, when thickness is greater than 280mm, the mode that adopts first passage first to enter from microcephaly is rolled, and each passage is set drafts by point of maximum thickness; After tapering is eliminated, by meeting maximum bite condition and torque capacity, limit to distribute drafts, in even-numbered pass, by edger roll, compensate rolled piece flat shape is controlled, and whole process using is along rolling, do not turn steel, the target thickness that is rolled to intermediate blank with minimum passage, target thickness is made as 100mm.
Rolling from Ingot after coming out of the stove is made to intermediate blank, by the rising head excision of intermediate blank, and intermediate blank is carried out to reconditioning.
Concrete rolling procedure is as shown in table 3 below.
The table 3Cr12MoV tapering that disappears is rolled into the actual rolling procedure table of intermediate blank
Note: in table, each size is the hot value of considering after thermal expansion
For Cr5Mo1V:
Rolling strategy is identical with Cr12MoV, and concrete rolling procedure is as shown in table 4 below.
The table 4Cr5Mo1V tapering that disappears is rolled into the actual rolling procedure table of intermediate blank
Note: in table, each size is the hot value of considering after thermal expansion
3.2 intermediate blank heating
During intermediate blank shove charge, furnace temperature, not higher than 650 ℃, heats up with stove; And be at least incubated 2 hours in the time of 650 ℃, and continue to heat up, after steel ingot internal and external temperature is even, can suitably accelerate firing rate, arrive after 1150 ± 30 ℃, continue insulation at least 2 hours, come out of the stove afterwards.
3.3 intermediate blank three rolling processes are rolled to target size
For Cr12MoV:
Cr12MoV completes after the rolling, by the excision of rising head position, and upper and lower surface, limit portion is carried out to reconditioning, is finally cut into length 2000mm, width 1190mm, the intermediate blank of thickness 100mm.
Concrete rolling procedure is as shown in table 5 below.
Table 5Cr12MoV intermediate blank three rolling processes are rolled to the actual rolling procedure table of target size
Note: in table, each size is the hot value of considering after thermal expansion
For Cr5Mo1V:
Rolling strategy is identical with Cr12Mo1V, and concrete rolling procedure is as shown in table 6 below.
Table 6Cr5Mo1V intermediate blank three rolling processes are rolled to the actual rolling procedure table of target size
Note: in table, each size is the hot value of considering after thermal expansion
According to the machining manufacture of steel plate of die steel of the present invention, process mould steel Cr12MoV and Cr5Mo1V steel plate, without defects such as surface, edge cracks.
Claims (2)
1. a machining manufacture for steel plate of die steel, is characterized in that, comprises the following steps:
Step 1, by die casting production mould steel ingot, described mould steel steel ingot is fillet slab ingot, the both sides in the cross section of described fillet slab ingot are circular-arc;
Step 2, described steel ingot is adopted to heating furnace heating, during steel ingot shove charge, furnace temperature, not higher than 650 ℃, heats up with stove, and is at least incubated after 2 hours in the time of 650 ℃, then heat up, and arrives after 1150 ± 30 ℃, continues insulation at least 2 hours, comes out of the stove afterwards;
Step 3, the Rolling from Ingot after coming out of the stove is made to intermediate blank, by the rising head excision of intermediate blank, and intermediate blank is carried out to reconditioning;
Step 4, intermediate blank after reconditioning is adopted to heating furnace heating, during steel ingot shove charge, furnace temperature, not higher than 650 ℃, heats up with stove, and is at least incubated after 2 hours in the time of 650 ℃, then heat up, and arrives after 1150 ± 30 ℃, continues insulation at least 2 hours, comes out of the stove afterwards;
Step 5, to intermediate blank after coming out of the stove, adopt roll forming, broadening rolling, finish rolling rolling three phases to be rolled, make steel plate of die steel.
2. the machining manufacture of steel plate of die steel as claimed in claim 1, is characterized in that, the Rolling from Ingot described in described step 3 is made intermediate blank and adopted steel ingot microcephaly to be introduced into the mode rolling of milling train.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483523A (en) * | 2003-07-29 | 2004-03-24 | 宝钢集团上海五钢有限公司 | Productive method for cr 12 Mov rolling cogging |
| CN101591754A (en) * | 2009-07-01 | 2009-12-02 | 忠县一胜特工模材料有限公司 | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process |
| CN101713052A (en) * | 2009-09-04 | 2010-05-26 | 山东远大模具材料有限公司 | Non-quenching high-toughness cold-working die steel and production process |
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| JP3460583B2 (en) * | 1998-05-21 | 2003-10-27 | Ｊｆｅスチール株式会社 | Thick steel plate manufacturing apparatus and thick steel plate manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483523A (en) * | 2003-07-29 | 2004-03-24 | 宝钢集团上海五钢有限公司 | Productive method for cr 12 Mov rolling cogging |
| CN101591754A (en) * | 2009-07-01 | 2009-12-02 | 忠县一胜特工模材料有限公司 | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process |
| CN101713052A (en) * | 2009-09-04 | 2010-05-26 | 山东远大模具材料有限公司 | Non-quenching high-toughness cold-working die steel and production process |
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| JP特开平11-319908A 1999.11.24 |
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