CN103447767B - The preparation method of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel - Google Patents
The preparation method of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel Download PDFInfo
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- CN103447767B CN103447767B CN201310377181.5A CN201310377181A CN103447767B CN 103447767 B CN103447767 B CN 103447767B CN 201310377181 A CN201310377181 A CN 201310377181A CN 103447767 B CN103447767 B CN 103447767B
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Abstract
The invention discloses the preparation method of the large scale special-shaped section rings base of a kind of G10CrNi3Mo bearing steel, after the steps include: that G10CrNi3Mo alloy bar material is heated to 1210 ± 20 DEG C with certain mode of heating, through jumping-up, punching, the orthogonal section rings base of roll off; An odd-shaped cross section ring base is expanded into again with 23 ~ 26MN pressure; Secondary odd-shaped cross section ring base is expanded into again with the pressure of 20 ~ 25MN; Again with the pressure of 8 ~ 12MN exceeding the upper end free compression of secondary odd-shaped cross section ring base of loose tool to concordant with loose tool, obtain final odd-shaped cross section ring base.The method can effectively reduce the forming pressure needed for base, simultaneously can the flow direction of effective Controlling Technology clout, the forming dimension of guarantee intermediate blank.The method is applicable to the preparation of large scale special-shaped section ring parts intermediate blank.
Description
Technical field
The present invention relates to a kind of blank-making method of annular forging piece, particularly relate to the preparation method of the large scale special-shaped section rings base of a kind of G10CrNi3Mo bearing steel.
Background technology
The looping mill rolling technology of annular forging piece is the FMT of a kind of advanced person, now reaches its maturity, and the size of annular forging piece is also do larger and larger, and shape also becomes increasingly complex.Want the annular forging piece obtaining qualified, the function admirable of geomery, its key is to make rational intermediate blank.
Chinese invention patent description CN101020284A (application number: the blank-making method 200710077667.1) disclosing the large scale special-shaped section rings base of high temperature alloy disclosed on 08 22nd, 2007, 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; Straight-flanked ring base is put on the epimorph built-in mould base plate of bulging die, apply pressure and shape mould in bulging die and epimorph extruding matched moulds are made 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 again.Adopt this technique base, after matched moulds, shape mould has been totally enclosed, when producing large, heavy ring, if material is the large scale special-shaped section rings base of G10CrNi3Mo 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 reaches more than 100MN (being equivalent to the pressure of 10000 tons), and the domestic producer having up to ten thousand tons of forging equipments is considerably less, and most of producer does 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 forging blank-making method, realize the preparation of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel, the method can effectively reduce the forming pressure needed for base, simultaneously can the flow direction of effective Controlling Technology clout, the forming dimension of guarantee intermediate blank and mechanical property.
For solving the problems of the technologies described above, the preparation method of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel of the present invention, its technical scheme comprises the following steps:
The first step, by G10CrNi3Mo alloy bar material with the temperature shove charge being less than or equal to 850 DEG C, and be heated to 850 DEG C of insulations, temperature retention time is:
be heated to 1210 ± 20 DEG C of insulations again, temperature retention time is:
Second step, by the G10CrNi3Mo alloy bar material of described heating, good heat insulation, through jumping-up, punching, the orthogonal section rings base of roll off;
3rd step, loads described rectangle cross-section ring base in loose tool, and operation forging press is with F
1be that the pressure of 23 ~ 26MN is by bulging drift less for tapering press-in rectangle cross-section ring base, first time bulging is carried out to rectangle cross-section ring base, rectangle cross-section ring base is expanded into 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 an odd-shaped cross section ring base;
4th step, takes out the bulging drift that tapering is less, changes the bulging drift that tapering is larger into, and operation forging press is with F
2be that the bulging drift that the pressure tapering of 20 ~ 25MN is larger is pressed in an odd-shaped cross section ring base, carry out second time bulging to an odd-shaped cross section ring base, the inclined-plane completing odd-shaped cross section ring base is shaped, and obtains secondary odd-shaped cross section ring base;
5th step, operation forging press is with F
3the pressure being 8 ~ 12MN, extremely concordant with loose tool for the upper end free compression of the secondary odd-shaped cross section ring base exceeding loose tool, complete the shaping that odd-shaped cross section ring base is topped bar, 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 tops bar and belong 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 section rings base of G10CrNi3Mo bearing steel of the present invention, 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, point three steps of topping bar, when namely getting out of a predicament or an embarrassing situation with inclined-plane shaping, mould contacts completely with forging, and belonging to is closed forging; And top bar be shaped time, mould and forging not exclusively contact, and belonging to is semi-enclosed forging.Finally shaped owing to topping bar, 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 forming pressure needed for base, simultaneously can the flow direction of effective Controlling Technology clout, the forming dimension of guarantee intermediate blank.After tested, the maximum pressure value that the method often walks shaping stage is all less than or equal to 26MN, is suitable for the equipment requirement of overwhelming majority's forging producer of China completely.
Adopt the large scale special-shaped section rings base of G10CrNi3Mo bearing steel prepared by said method, after finish to gauge is shaped, forging ' s block dimension meets technical requirement, without misrun phenomenon; After forging heat treatment, after tested, its property indices is as follows:
Room temperature tensile properties: tensile strength is 1010MPa, yield strength is 845MPa, and hardness is 322HB, and percentage elongation is 10%, and the contraction percentage of area is 56%.
The test structure of above properties all meets technical indicator.
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 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 that odd-shaped cross section ring base is topped bar forming process schematic diagram.
Fig. 4 is odd-shaped cross section ring blank structure schematic diagram.
Detailed description of the invention
Implement the preparation method of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel of the present invention, need to provide the equipment such as forging press, looping mill, high-temperature electric resistance furnace.The large scale special-shaped section rings forging being G10CrNi3Mo alloy for China's material trademark below describes the detailed description of the invention of the method in detail.
Preparation method's processing step of this alloy large-size odd-shaped cross section ring base is as follows:
Step 1: blanking.According to certain specification blanking, raw material are G10CrNi3Mo alloy, and its main chemical elements content (percentage by weight) is: C content 0.17% ~ 0.25%, si content 0.17% ~ 0.37%, containing Mn amount 0.30% ~ 0.60%, containing S amount≤0.030%, P content≤0.030%, containing Cr amount 0.60% ~ 0.90%, ni content 2.75% ~ 3.25%, containing Cu amount≤0.25%, surplus is Fe.
Step 2: heating.By G10CrNi3Mo alloy bar material with the temperature shove charge being less than or equal to 850 DEG C, and be heated to 850 DEG C of insulations, temperature retention time is:
be heated to 1210 ± 20 DEG C of insulations again, temperature retention time is:
Step 3: jumping-up, punching, roll off.By the G10CrNi3Mo alloy bar material of heating, good heat insulation, through jumping-up, punching, the orthogonal section rings base 10 of roll off.
Step 4: odd-shaped cross section ring base horn mouth and shaping of getting out of a predicament or an embarrassing situation.Rectangle cross-section ring base 10 is loaded in loose tool 4, loose tool 4 is fixed on the lower anvil block 6 of forging press, the bulging drift 2 selecting tapering less is also placed in rectangle cross-section ring base 10 upper end, for ensureing that bulging drift 2 can be pressed onto the end completely, make to get out of a predicament or an embarrassing situation and be shaped completely, on bulging drift 2, put a cushion block 7, as shown in Figure 1, operation forging press is with F
1be that the pressure of 23 ~ 26MN makes anvil block 5 pressure pad block 7 downwards, bulging drift 2 is pressed in rectangle cross-section ring base 10, first time bulging is carried out to rectangle cross-section ring base 10, rectangle cross-section ring base 10 is expanded into 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 an odd-shaped cross section ring base 11.
Step 5: odd-shaped cross section ring base inclined-plane is shaped.Take out the bulging drift 2 that tapering is less, change the bulging drift 3 that tapering is larger into, as shown in Figure 2, with step 3, operation forging press is with F
2be that the pressure of 20 ~ 25MN makes anvil block 5 pressure pad block 7 downwards, bulging drift 3 is pressed in an odd-shaped cross section ring base, second time bulging is carried out to an odd-shaped cross section ring base, when bulging drift 3 contacts with lower anvil block 6, namely complete the shaping on odd-shaped cross section ring base inclined-plane, obtain secondary odd-shaped cross section ring base 12.
Step 6: odd-shaped cross section ring base is topped bar shaping.Take out cushion block 7, in operation anvil block 5 move down and with the upper-end contact of secondary odd-shaped cross section ring base 12, as shown in Figure 3, operate forging press with F
3be that the pressure of 8 ~ 12MN makes anvil block 5 extrude the upper end of secondary odd-shaped cross section ring base 12, to the upper end free compression of the secondary odd-shaped cross section ring base 12 of loose tool 4 be exceeded 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.
Adopt G10CrNi3Mo alloy final odd-shaped cross section ring base 13 prepared by said method, 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 tops bar and belong to semi-enclosed forging, and therefore, this odd-shaped cross section ring base monolithic molding belongs to semi-enclosed forging.
Claims (3)
1. a preparation method for the large scale special-shaped section rings base of G10CrNi3Mo bearing steel, is characterized in that, comprise the following steps:
The first step, by G10CrNi3Mo alloy bar material with the temperature shove charge being less than or equal to 850 DEG C, and be heated to 850 DEG C of insulations, temperature retention time is:
be heated to 1210 ± 20 DEG C of insulations again, temperature retention time is:
Second step, by the G10CrNi3Mo alloy bar material of described heating, good heat insulation, through jumping-up, punching, the orthogonal section rings base of roll off;
3rd step, loads described rectangle cross-section ring base in loose tool, and operation forging press is with F
1be that the pressure of 23 ~ 26MN is by bulging drift less for tapering press-in rectangle cross-section ring base, first time bulging is carried out to rectangle cross-section ring base, rectangle cross-section ring base is expanded into 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 an odd-shaped cross section ring base;
4th step, takes out the bulging drift that tapering is less, changes the bulging drift that tapering is larger into, and operation forging press is with F
2be that the bulging drift that the pressure tapering of 20 ~ 25MN is larger is pressed in an odd-shaped cross section ring base, carry out second time bulging to an odd-shaped cross section ring base, the inclined-plane completing odd-shaped cross section ring base is shaped, and obtains secondary odd-shaped cross section ring base;
5th step, operation forging press is with F
3the pressure being 8 ~ 12MN, extremely concordant with loose tool for the upper end free compression of the secondary odd-shaped cross section ring base exceeding loose tool, complete the shaping that odd-shaped cross section ring base is topped bar, obtains final odd-shaped cross section ring base.
2. the preparation method of the large scale special-shaped section rings base of G10CrNi3Mo bearing steel according to claim 1, 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 section rings base of G10CrNi3Mo bearing steel according to claim 1, 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7215200B2 (en) | 2019-02-08 | 2023-01-31 | 日本製鉄株式会社 | Forming method and forming apparatus for annular member |
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| CN105396997A (en) * | 2015-12-02 | 2016-03-16 | 贵州安大航空锻造有限责任公司 | Isotropic rolling method for bearing steel rectangular ring |
| CN114178459B (en) * | 2021-12-07 | 2024-04-02 | 贵州航宇科技发展股份有限公司 | Forming method and die for stainless steel large taper ring with flange |
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| CN1586753A (en) * | 2004-09-21 | 2005-03-02 | 武汉理工大学 | Method for rolling and forming rectangular section aluminium alloy ring piece |
| CN101020284A (en) * | 2007-03-05 | 2007-08-22 | 贵州安大航空锻造有限责任公司 | Making process of large irregular ring blank of high temperature alloy |
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| CN102319868A (en) * | 2011-08-08 | 2012-01-18 | 西南铝业（集团）有限责任公司 | Forging molding method of large-scale aluminum alloy conical ring |
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| JP3443528B2 (en) * | 1998-08-28 | 2003-09-02 | 日本高周波鋼業株式会社 | Method for manufacturing stepped and flanged annular members |
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| CN1586753A (en) * | 2004-09-21 | 2005-03-02 | 武汉理工大学 | Method for rolling and forming rectangular section aluminium alloy ring piece |
| CN101020284A (en) * | 2007-03-05 | 2007-08-22 | 贵州安大航空锻造有限责任公司 | Making process of large irregular ring blank of high temperature alloy |
| CN101537466A (en) * | 2009-04-30 | 2009-09-23 | 西南铝业（集团）有限责任公司 | Method for manufacturing aluminium alloy rings with high performance and low residual stress |
| CN102319868A (en) * | 2011-08-08 | 2012-01-18 | 西南铝业（集团）有限责任公司 | Forging molding method of large-scale aluminum alloy conical ring |
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Cited By (1)
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| JP7215200B2 (en) | 2019-02-08 | 2023-01-31 | 日本製鉄株式会社 | Forming method and forming apparatus for annular member |
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