CN103447765A - Preparing method of G20Cr2Ni4 bearing steel large-scale special-shaped cross section annular blank - Google Patents
Preparing method of G20Cr2Ni4 bearing steel large-scale special-shaped cross section annular blank Download PDFInfo
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- CN103447765A CN103447765A CN2013103769139A CN201310376913A CN103447765A CN 103447765 A CN103447765 A CN 103447765A CN 2013103769139 A CN2013103769139 A CN 2013103769139A CN 201310376913 A CN201310376913 A CN 201310376913A CN 103447765 A CN103447765 A CN 103447765A
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Abstract
The invention discloses a preparing method of a G20Cr2Ni4 bearing steel large-scale special-shaped cross section annular blank. The preparing method comprises the steps that a G20Cr2Ni4 alloy bar is heated to be 1180+/-20 DEG C in a certain heating mode, and is then subjected to upsetting, punching and rolling to become a rectangular cross section annular blank; then, the rectangular cross section annular blank is expanded into a primary special-shaped cross section annular blank at the pressure of 24 to 28MN; next, the primary special-shaped cross section annular blank is expanded into a secondary special-shaped cross section annular blank at the pressure of 22 to 26MN; then, the upper end of the secondary special-shaped cross section annular blank higher than a loose tooling is subjected to free upsetting to be flush with the loose tooling at the pressure of 10 to 14MN, and the final special-shaped cross section annular blank is obtained. The method has the advantages that the forming pressure required by the blank manufacturing can be effectively reduced, meanwhile, the flow direction of process excess materials can be effectively controlled, and the forming dimension of an intermediate blank is ensured. The method is applicable to the preparation of the intermediate blank of a large-scale special-shaped cross section annular blank element.
Description
Technical field
The present invention relates to a kind of blank-making method of annular forging piece, particularly related to the preparation method of the large scale special-shaped cross section of a kind of G20Cr2Ni4 bearing steel ring base.
Background technology
The looping mill rolling technology of annular forging piece is a kind of advanced person's FMT, now reach its maturity, and the size of annular forging piece is also to do larger and larger, and shape also becomes increasingly complex.Want to obtain that geomery is qualified, the annular forging piece of function admirable, its key is to make rational intermediate blank.
On 08 22nd, 2007 disclosed Chinese invention patent specification CN101020284A (application numbers: the blank-making method that 200710077667.1) discloses the large scale special-shaped cross section of high temperature alloy ring base, the blank-making technology that this patent adopts is: jumping-up, punching on forging press, the orthogonal ring base of roll off on looping mill; The straight-flanked ring base is put on the built-in baffle plate of epimorph of bulging die again, exerted pressure and make the interior shape mould of bulging die and epimorph extruding matched moulds the rectangle cross-section ring base be out of shape and be full of the die cavity of shape mould, the demoulding obtains odd-shaped cross section ring base.Adopt this technique base, after matched moulds, the shape mould has been totally enclosed, when producing large, heavy ring, as the large scale special-shaped cross section ring base that material is the G20Cr2Ni4 bearing steel, the weight of this forging is larger, reach 1.5 tons even higher to 2 tons, the instantaneous pressure maximum of matched moulds has reached 100MN(and has been equivalent to the pressure of 10000 tons) more than, and the domestic producer that has up to ten thousand tons of forging equipments is considerably less, most of producers do not have ability to produce this large heavy deformed ring forging.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of semienclosed loose tool and forges blank-making method, realize the preparation of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel ring base, the method can effectively reduce the required forming pressure of base, can effectively control the flow direction of technique clout, guarantee forming dimension and the mechanical property of intermediate blank simultaneously.
For solving the problems of the technologies described above, the preparation method of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel of the present invention ring base, its technical scheme comprises the following steps:
The first step, to be less than or equal to the temperature shove charge of 850 ℃, and be heated to 850 ℃ of insulations by the G20Cr2Ni4 alloy bar material, and temperature retention time is:
be heated to 1180 ± 20 ℃ of insulations, temperature retention time is again:
Second step, by the G20Cr2Ni4 alloy bar material of described heating, good heat insulation, through jumping-up, punching, the orthogonal cross section of roll off ring base;
The 3rd step, pack described rectangle cross-section ring base in loose tool into, and the operation forging press is with F
1the pressure bulging drift that tapering is less that is 24～28MN is pressed in the rectangle cross-section ring base, the rectangle cross-section ring base is carried out to bulging for the first time, the rectangle cross-section ring base is expanded into to bell mouth shape, completes the shaping that odd-shaped cross section ring base is got out of a predicament or an embarrassing situation simultaneously, obtain odd-shaped cross section ring base one time;
The 4th step, take out the less bulging drift of tapering, changes the bulging drift that tapering is larger into, and the operation forging press is with F
2be that the pressure bulging drift larger with tapering of 22～26MN is pressed in odd-shaped cross section ring base, an odd-shaped cross section ring base is carried out to bulging for the second time, the inclined-plane that completes odd-shaped cross section ring base is shaped, and obtains secondary odd-shaped cross section ring base;
The 5th step, the operation forging press is with F
3the pressure that is 10～14MN is extremely concordant with loose tool the upper end free compression of the secondary odd-shaped cross section ring base that exceeds loose tool, completes the shaping that odd-shaped cross section ring base is topped bar, and obtains final odd-shaped cross section ring base.
In said method, described odd-shaped cross section ring base is got out of a predicament or an embarrassing situation and the shaping on inclined-plane belongs to closed forging, and top bar, belongs to semi-enclosed forging, and therefore, this odd-shaped cross section ring base monolithic molding belongs to semi-enclosed forging.
Compared with prior art, beneficial effect of the present invention is as follows:
The preparation method of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel of the present invention ring base, the method adopts semiclosed loose tooling forging to be shaped to the getting out of a predicament or an embarrassing situation of intermediate blank, inclined-plane, minute three steps of topping bar, get out of a predicament or an embarrassing situation while being shaped with inclined-plane, mould contacts fully with forging, and belonging to is closed forging; And top bar while being shaped, mould is not exclusively to contact with forging, belonging to is semi-enclosed forging.Owing to topping bar, be finally shaped, and be again semi-enclosed forging, process allowance is concentrated on top bar place, and do not need to limit the space that unnecessary process allowance takies, effectively reduce the required forming pressure of base, can effectively control the flow direction of technique clout, guarantee the forming dimension of intermediate blank simultaneously.After tested, the maximum pressure value of the every step shaping stage of the method all is less than or equal to 28MN, the most equipment requirements that forge producer of fully applicable China.
The large scale special-shaped cross section of the G20Cr2Ni4 bearing steel that adopts said method to prepare ring base, after finish to gauge is shaped, forging ' s block dimension meets specification requirement, without the misrun phenomenon; After forging heat treatment, after tested, its property indices is as follows:
The room temperature tensile performance: tensile strength is 1186MPa, and yield strength is 931MPa, and hardness is 221HB, and percentage elongation is 12%, and the contraction percentage of area is 46%.
The test structure of above properties all meets technical indicator.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is odd-shaped cross section ring base horn mouth and the forming process schematic diagram of getting out of a predicament or an embarrassing situation.
Fig. 2 is odd-shaped cross section ring base inclined-plane forming process schematic diagram.
Fig. 3 is the odd-shaped cross section ring base forming process schematic diagram of topping bar.
Fig. 4 is odd-shaped cross section ring blank structure schematic diagram.
The specific embodiment
Implement the preparation method of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel of the present invention ring base, the equipment such as forging press, looping mill, high-temperature electric resistance furnace need to be provided.The large scale special-shaped cross section ring forging that China's material trademark of below take is the G20Cr2Ni4 alloy describes the specific embodiment of the method in detail as example.
Preparation method's processing step of this alloy large-size odd-shaped cross section ring base is as follows:
Step 1: blanking.According to the certain specification blanking, raw material are the G20Cr2Ni4 alloy, and its main chemical elements content (percentage by weight) is: C content 0.17%～0.23%, si content 0.15%～0.4%, containing Mn amount 0.30%～0.60%, containing S amount≤0.030%, P content≤0.030%, containing Cr amount 1.25%～1.75%, ni content 3.25%～3.75%, containing Cu amount≤0.25%, surplus, be Fe.
Step 2: heating.The G20Cr2Ni4 alloy bar material, to be less than or equal to the temperature shove charge of 850 ℃, and is heated to 850 ℃ of insulations, and temperature retention time is:
be heated to 1180 ± 20 ℃ of insulations, temperature retention time is again:
Step 3: jumping-up, punching, roll off.By the G20Cr2Ni4 alloy bar material of heating, good heat insulation, through jumping-up, punching, the orthogonal cross section of roll off ring base 10.
Step 4: odd-shaped cross section ring base horn mouth and the shaping of getting out of a predicament or an embarrassing situation.Rectangle cross-section ring base 10 is packed in loose tool 4, loose tool 4 is to be fixed on the lower anvil block 6 of forging press, select the bulging drift 2 that tapering is less and be placed in rectangle cross-section ring base 10 upper ends, for guaranteeing that drift 2 can be pressed onto the end fully, make to get out of a predicament or an embarrassing situation and be shaped fully, put a cushion block 7 on drift 2, as shown in Figure 1, the operation forging press is with F
1the pressure that is 24～28MN makes the downward pressure pad piece 7 of anvil block 5, bulging drift 2 is pressed in rectangle cross-section ring base 10, rectangle cross-section ring base 10 is carried out to bulging for the first time, rectangle cross-section ring base 10 is expanded into to bell mouth shape, complete the shaping that odd-shaped cross section ring base is got out of a predicament or an embarrassing situation simultaneously, obtain odd-shaped cross section ring base 11 one time.
Step 5: odd-shaped cross section ring base inclined-plane is shaped.Take out the less bulging drift 2 of tapering, change the bulging drift 3 that tapering is larger into, as shown in Figure 2, with step 3, the operation forging press is with F
2the pressure that is 22～26MN makes the downward pressure pad piece 7 of anvil block 5, bulging drift 3 is pressed in odd-shaped cross section ring base, an odd-shaped cross section ring base is carried out to bulging for the second time, when bulging drift 3 contacts with lower anvil block 6, complete the shaping on odd-shaped cross section ring base inclined-plane, obtained secondary odd-shaped cross section ring base 12.
Step 6: the odd-shaped cross section ring base shaping of topping bar.Take out cushion block 7, in operation anvil block 5 move down and with the upper end in contact of secondary odd-shaped cross section ring base 12, as shown in Figure 3, operate forging press with F
3the pressure that is 10～14MN makes anvil block 5 push the upper end of secondary odd-shaped cross section ring bases 12, to exceed the upper end free compression of secondary odd-shaped cross section ring base 12 of loose tool 4 to concordant with loose tool 4, complete the shaping that odd-shaped cross section ring base is topped bar, obtain final odd-shaped cross section ring base 13.
The final odd-shaped cross section ring of the G20Cr2Ni4 alloy base 13 that adopts said method to prepare, its structure as shown in Figure 4.
In said method, described odd-shaped cross section ring base is got out of a predicament or an embarrassing situation and the shaping on inclined-plane belongs to closed forging, and top bar, belongs to semi-enclosed forging, and therefore, this odd-shaped cross section ring base monolithic molding belongs to semi-enclosed forging.
Claims (3)
1. the preparation method of the large scale special-shaped cross section of a G20Cr2Ni4 bearing steel ring base, is characterized in that, comprises the following steps:
The first step, to be less than or equal to the temperature shove charge of 850 ℃, and be heated to 850 ℃ of insulations by the G20Cr2Ni4 alloy bar material, and temperature retention time is:
be heated to 1180 ± 20 ℃ of insulations, temperature retention time is again:
Second step, by the G20Cr2Ni4 alloy bar material of described heating, good heat insulation, through jumping-up, punching, the orthogonal cross section of roll off ring base;
The 3rd step, pack described rectangle cross-section ring base in loose tool into, and the operation forging press is with F
1the pressure bulging drift that tapering is less that is 24～28MN is pressed in the rectangle cross-section ring base, the rectangle cross-section ring base is carried out to bulging for the first time, the rectangle cross-section ring base is expanded into to bell mouth shape, completes the shaping that odd-shaped cross section ring base is got out of a predicament or an embarrassing situation simultaneously, obtain odd-shaped cross section ring base one time;
The 4th step, take out the less bulging drift of tapering, changes the bulging drift that tapering is larger into, and the operation forging press is with F
2be that the pressure bulging drift larger with tapering of 22～26MN is pressed in odd-shaped cross section ring base, an odd-shaped cross section ring base is carried out to bulging for the second time, the inclined-plane that completes odd-shaped cross section ring base is shaped, and obtains secondary odd-shaped cross section ring base;
The 5th step, the operation forging press is with F
3the pressure that is 10～14MN is extremely concordant with loose tool the upper end free compression of the secondary odd-shaped cross section ring base that exceeds loose tool, completes the shaping that odd-shaped cross section ring base is topped bar, and obtains final odd-shaped cross section ring base.
2. the preparation method of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel according to claim 1 ring base, is characterized in that, described odd-shaped cross section ring base is got out of a predicament or an embarrassing situation and the shaping on inclined-plane belongs to closed forging.
3. the preparation method of the large scale special-shaped cross section of G20Cr2Ni4 bearing steel according to claim 1 ring base, is characterized in that, the shaping that described odd-shaped cross section ring base is topped bar belongs to semi-enclosed forging.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139145A (en) * | 2014-08-11 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Method for forging guide horn mouth forge pieces applied to internal components of nuclear reactor |
| CN104139147A (en) * | 2014-07-07 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Forging method of SB564 UNS N06690 alloy large-scale internal T-shaped annular forge piece blank |
| CN106270142A (en) * | 2016-08-31 | 2017-01-04 | 无锡派克新材料科技股份有限公司 | A kind of aluminium alloy punching cold bulging method |
| CN108213316A (en) * | 2016-12-14 | 2018-06-29 | 贵州航宇科技发展股份有限公司 | 2219 aluminium alloy big-taper-angle taper shape ring forging manufacturing methods |
| CN109530607A (en) * | 2018-12-28 | 2019-03-29 | 贵州航宇科技发展股份有限公司 | A kind of 718plus forging special-shape ring manufacturing process |
| CN109848343A (en) * | 2018-11-28 | 2019-06-07 | 通裕重工股份有限公司 | A kind of abnormal shape step ring forging forming method |
| CN112139416A (en) * | 2020-09-18 | 2020-12-29 | 上海电气上重铸锻有限公司 | Preparation method and die of extra-large-size special-shaped ring forging with outer steps |
| CN113000755A (en) * | 2021-03-24 | 2021-06-22 | 上海电气上重铸锻有限公司 | Profiling forging forming method and tool for oversized forging substitute ring forging |
| CN113953423A (en) * | 2021-10-15 | 2022-01-21 | 贵州航宇科技发展股份有限公司 | Hollow reducing extrusion forming process method for stainless steel thick-wall super-large half-cone angle special-shaped ring forging with inner flange structure |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104139147A (en) * | 2014-07-07 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Forging method of SB564 UNS N06690 alloy large-scale internal T-shaped annular forge piece blank |
| CN104139145A (en) * | 2014-08-11 | 2014-11-12 | 贵州航天新力铸锻有限责任公司 | Method for forging guide horn mouth forge pieces applied to internal components of nuclear reactor |
| CN106270142A (en) * | 2016-08-31 | 2017-01-04 | 无锡派克新材料科技股份有限公司 | A kind of aluminium alloy punching cold bulging method |
| CN108213316B (en) * | 2016-12-14 | 2020-04-28 | 贵州航宇科技发展股份有限公司 | 2219 aluminum alloy large-cone-shaped pyramid annular forging manufacturing method |
| CN108213316A (en) * | 2016-12-14 | 2018-06-29 | 贵州航宇科技发展股份有限公司 | 2219 aluminium alloy big-taper-angle taper shape ring forging manufacturing methods |
| CN109848343A (en) * | 2018-11-28 | 2019-06-07 | 通裕重工股份有限公司 | A kind of abnormal shape step ring forging forming method |
| CN109848343B (en) * | 2018-11-28 | 2020-09-11 | 通裕重工股份有限公司 | Forging forming method for replacing ring of hydraulic pile driver |
| CN109530607A (en) * | 2018-12-28 | 2019-03-29 | 贵州航宇科技发展股份有限公司 | A kind of 718plus forging special-shape ring manufacturing process |
| CN112139416A (en) * | 2020-09-18 | 2020-12-29 | 上海电气上重铸锻有限公司 | Preparation method and die of extra-large-size special-shaped ring forging with outer steps |
| CN113000755A (en) * | 2021-03-24 | 2021-06-22 | 上海电气上重铸锻有限公司 | Profiling forging forming method and tool for oversized forging substitute ring forging |
| CN113000755B (en) * | 2021-03-24 | 2022-03-25 | 上海电气上重铸锻有限公司 | Profiling forging forming method and tool for oversized forging substitute ring forging |
| CN113953423A (en) * | 2021-10-15 | 2022-01-21 | 贵州航宇科技发展股份有限公司 | Hollow reducing extrusion forming process method for stainless steel thick-wall super-large half-cone angle special-shaped ring forging with inner flange structure |
| CN113953423B (en) * | 2021-10-15 | 2023-12-08 | 贵州航宇科技发展股份有限公司 | Hollow diameter-reducing extrusion forming process method for stainless steel thick-wall ultra-large half-cone-angle special-shaped ring forging with inner flange structure |
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Application publication date: 20131218 |