CN103447766B - The preparation method of the large scale special-shaped section rings base of GCr15 bearing steel - Google Patents
The preparation method of the large scale special-shaped section rings base of GCr15 bearing steel Download PDFInfo
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- CN103447766B CN103447766B CN201310376917.7A CN201310376917A CN103447766B CN 103447766 B CN103447766 B CN 103447766B CN 201310376917 A CN201310376917 A CN 201310376917A CN 103447766 B CN103447766 B CN 103447766B
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Abstract
The invention discloses the preparation method of the large scale special-shaped section rings base of a kind of GCr15 bearing steel, after the steps include: that GCr15 alloy bar material is heated to 1280 ± 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 26 ~ 32MN pressure; Secondary odd-shaped cross section ring base is expanded into again with the pressure of 24 ~ 28MN; Again with the pressure of 12 ~ 16MN 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 GCr15 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 GCr15 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 the pressure that 100MN(is equivalent to 10000 tons) more than, and the domestic producer having up to ten thousand tons of forging equipments is considerably less, 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 GCr15 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 GCr15 bearing steel of the present invention, its technical scheme comprises the following steps:
The first step, by GCr15 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 1280 ± 20 DEG C of insulations again, temperature retention time is:
Second step, by the GCr15 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 26 ~ 32MN 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 24 ~ 28MN 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 12 ~ 16MN, 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 GCr15 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 32MN, 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 GCr15 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 1852MPa, yield strength is 1023MPa, and hardness is 65HRC, and percentage elongation is 10%, and the contraction percentage of area is 42%.
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 GCr15 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 GCr15 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 GCr15 alloy, and its main chemical elements content (percentage by weight) is: C content 0.95% ~ 1.05%, si content 0.40% ~ 0.65%, containing Mn amount 0.90% ~ 1.20%, containing S amount≤0.020%, P content≤0.027%, containing Cr amount 1.30% ~ 1.65%, ni content≤0.30%, containing Cu amount≤0.25%, surplus is Fe.
Step 2: heating.By GCr15 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 1280 ± 20 DEG C of insulations again, temperature retention time is:
Step 3: jumping-up, punching, roll off.By the GCr15 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 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 drift 2, put a cushion block 7, as shown in Figure 1, operation forging press is with F
1be that the pressure of 26 ~ 32MN 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 24 ~ 28MN 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 12 ~ 16MN 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 GCr15 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 GCr15 bearing steel, is characterized in that, comprise the following steps:
The first step, by GCr15 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 1280 ± 20 DEG C of insulations again, temperature retention time is:
Second step, by the GCr15 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 26 ~ 32MN 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 24 ~ 28MN 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 12 ~ 16MN, 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 GCr15 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 GCr15 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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| CN104384826A (en) * | 2014-08-18 | 2015-03-04 | 贵州航宇科技发展股份有限公司 | Forging method of GH4169 alloy inner cartridge receiver special-shaped ring part |
| CN104841828A (en) * | 2015-05-13 | 2015-08-19 | 吴光英 | Steel tie rod forging technology |
| CN105479111B (en) * | 2015-12-25 | 2018-03-06 | 贵州航宇科技发展股份有限公司 | 1Cr11Ni2W2MoV alloys track type installs the manufacture method and mould on side |
| CN105755222B (en) * | 2016-04-12 | 2018-05-18 | 阳谷钢力矿机制造有限公司 | A kind of high yield, low nitrogen hypoxemia electroslag bearing steel forge piece manufacturing process |
| 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 |
| CN108213843A (en) * | 2016-12-14 | 2018-06-29 | 贵州航宇科技发展股份有限公司 | A kind of 2219 aluminum alloy C-shaped section rings process for manufacturing forging |
| CN114952206A (en) * | 2022-07-13 | 2022-08-30 | 宁波大学 | Machining method of bearing ring |
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| 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 |
| CN201264066Y (en) * | 2008-10-15 | 2009-07-01 | 陈宏毅 | Split type trolley sawtooth-forging mold for press machine |
| CN202411313U (en) * | 2011-12-15 | 2012-09-05 | 重庆银河铸锻有限责任公司 | Forging die for sleeve parts of forging machine tools |
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| JPH11147158A (en) * | 1997-11-13 | 1999-06-02 | Daido Steel Co Ltd | Simultaneous formation of inner and outer gears and forming apparatus used for the same |
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| 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 |
| CN201264066Y (en) * | 2008-10-15 | 2009-07-01 | 陈宏毅 | Split type trolley sawtooth-forging mold for press machine |
| CN202411313U (en) * | 2011-12-15 | 2012-09-05 | 重庆银河铸锻有限责任公司 | Forging die for sleeve parts of forging machine tools |
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| GH202合金涡轮球壳锻件成形工艺研究;刘峰;《第八届全国塑性加工学术年会论文集》;20021108;第144页第1栏第13-16行，第145页第1栏第20-28行，附图4 * |
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