CN102121084A - Low bainite cast steel shots and surface strengthening device thereof - Google Patents
Low bainite cast steel shots and surface strengthening device thereof Download PDFInfo
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Abstract
The invention discloses low bainite cast steel shots and a surface strengthening device thereof, belongs to the technical field of metal abrasive manufacture, and particularly relates to low bainite cast steel shots suitable for clearing and strengthening the surface of a workpiece and a surface strengthening device thereof. The cast steel shots are characterized by consisting of the following components in percentage by mass: 0.10 to 0.20 percent of C, 0.17 to 0.37 percent of Si, 0.35 to 0.65 percent of Mn, 0.7 to 1.10 percent of Cr, less than or equal to 0.035 percent of S, less than or equal to 0.035 percent of P and the balance of Fe and inevitable impurities. The tempered cast steel shots are added into the surface strengthening device at the feeding speed of 1 to 1.5 tons percent hour and processed and strengthened for 3 to 5 minutes, so that the hardness of the low bainite cast steel shots is improved by about 3 to 5 HRC at the same time of keeping high toughness; and the treated low bainite cast steel shots have the advantages of high hardness, good toughness, abrasion resistance and the like, and are particularly suitable for the requirements of surface shot blasting, shot blasting and strengthening of steel materials, castings, forgings and heat treatment pieces.
Description
Technical field
Low shellfish cast steel ball belongs to metal abrasives manufacturing technology field, is specifically related to a kind of workpiece surface cleaning and low shellfish cast steel ball and surface strengthening device thereof of strengthening of being applicable to.
Background technology
At present, the cast steel ball product that uses both at home and abroad mainly contains low-carbon (LC) and high-carbon two big classes.The high carbon cast steel ball is because of carbon content height (0.8-1.2wt.%C), through centrifugal or be atomized into the ball postcooling and form high-carbon plate martensite tissue to room temperature, and produce a large amount of crackles, though through heating quenching and temper once more, crackle still can exist, thereby fragility is big, and is not shock-resistant, broken easily in shotblasting, sandblast cleaning and shot peening strengthening process, losing quantity is big.Low-carbon cast steel ball carbon content low (less than 0.2wt.%C), the toughness height, but hardness is low, not wear-resisting, and because the fusing point height, Molten Steel Flow is poor, shrink big, cause shot loose many, although the ERVIN cycle life that 100% method of substitution is measured is lower owing to hardness when steel part is cleared up than high-carbon shot height with hollow defective, cleaning efficiency is low, clearance time is long, and the low carbon steel ball that the steel part reality of cleaning same amount is consumed does not reduce, and can increase on the contrary sometimes.Though low carbon steel ball is handled through secondary quenching and low-temperaturetempering, its hardness is still very low, can't satisfy the requirement to shotblasting, shot blasting and the reinforcement of steel, foundry goods, forging, thermal treatment part.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of surface hardness height is provided, be difficult for fragmentation, the low shellfish cast steel ball that wear resistance is good.
The technical solution adopted for the present invention to solve the technical problems is: this low shellfish cast steel ball, it is characterized in that its quality percentage composition is: C:0.10～0.20%, Si:0.17～0.37%, Mn:0.35～0.65%, Cr:0.7～1.10%, S≤0.035%, P≤0.035%, all the other are Fe and unavoidable impurities.
Preferably, the quality percentage composition is: C:0.19%, and Si:0.17%, Mn:0.65%, Cr:0.83%, S≤0.030%, P≤0.025%, all the other are Fe and unavoidable impurities.
Among the present invention, added alloying elements cr in traditional cast steel ball composition, it is higher to make it form hardness in matrix, the chromic oxide of disperse better effects if has further played crystal grain thinning, improves hardening capacity, increase shot hardness and intensity, and the effect that improves wear resistance.
Should adopt following processing step preparation by low shellfish cast steel ball:
1) with raw material weighing batching and in middle frequency furnace or electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into and is adopted aluminium deoxidation;
3) adopting centrifugal atomizing or water slug atomization, with step 2) molten steel after the deoxidation becomes drop, and drop becomes sphere under the capillary effect of molten steel, fall into the cooling basin and be frozen into the as cast condition cast steel ball;
4) from the cooling basin, pull oven dry of as cast condition cast steel ball and screening out;
5) the as cast condition cast steel ball after will drying and sieve is 860-930 ℃ of heating, is incubated after 30-40 minute in water cooling and carries out quench treatment, makes the heterogeneous structure cast steel ball of being made up of lath martensite and bainite;
6) cast steel ball after will quenching is incubated 30-60 minute and carries out temper under 150-480 ℃ of temperature;
7) input speed during with 1～1.5t/ adds in the surface strengthening device with the cast steel ball after the tempering, work strengthening 3-5 minute;
8) cast steel ball after the intensive treatment is packed.
A kind of surface strengthening device of low shellfish cast steel ball, it is characterized in that: the bracing or strutting arrangement that comprises motor, transmission mechanism, main frame and support main frame, described main frame is a hollow cylinder that tilts to the lower right, the center is provided with central shaft, be set with blade on the central shaft, main frame top left end is provided with opening for feed, right-hand member is provided with suction port, and the right-hand member below is provided with discharge port.
Described main frame is 1～2.5 ° to the angle of inclination, lower right.There is the purpose of 1～2.5 ° obliquity to be to make metal abrasives automatic stream discharge port in intensifying device between main frame and the horizontal plane,, can adjusts the time that metal abrasives is strengthened by adjusting obliquity.
Described main frame lateral length is 1.0～1.5m, and diameter is 500～700mm.
Described bracing or strutting arrangement is the left and right bearing support that is installed in the main frame both sides, and two ends, the central shaft left and right sides are respectively charged in the dead eye of left and right bearing support, and below, the bottom surface of left and right bearing support is respectively equipped with the altitude mixture control support.Left and right bearing is a self-aligning bearing.
Described blade rotational speed is 1000～1500 rev/mins.
Described transmission mechanism is chain or belt transmission.
The principle of work and the working process of surface strengthening device are as follows:
Starter motor, motor rotates by the blade that transmission mechanism drives in the main frame, input speed when treating behind the stability of rotation the low shellfish cast steel ball of finished product of the present invention with 1～1.5t/ adds in the opening for feed, blade through rotation hits, make between the shot, bump, friction produce work hardening and strengthen between shot and the liner, low shellfish cast steel ball rolls in main frame and strengthens after 2～5 minutes, flows out from discharge port.Simultaneously because bump and friction are removed and from suction port suction cleaner sucking-off the oxide skin on shot surface.It is to make shot automatic stream discharge port in intensifying device that the purpose of the obliquity of 1～2.5 degree is arranged between main frame and the horizontal plane, by adjusting obliquity, can adjust the time that shot is strengthened.The purpose that host housing is designed to opening structure is for the ease of the liner of side installation within it.
Compared with prior art, the beneficial effect that the low shellfish cast steel ball of the present invention is had is: make low shellfish shot when keeping high tenacity, hardness improves about 3-5HRC, low shellfish shot after the processing has hardness height, good toughness, advantage such as wear-resistant, is specially adapted to the requirement of shotblasting, shot blasting and the reinforcement of steel, foundry goods, forging, thermal treatment part.In addition, when shot was reinforced, surface scale also had been removed, and the shot through strengthening is more cleaned, the surface clearness of steel part when helping improving shot cleaning steel part.
Description of drawings
Fig. 1 is a surface strengthening device structural representation of the present invention.
Fig. 2 is Figure 1A-A cross section cross-sectional schematic.
Wherein: 1, electric motor, 2, left shaft holder, 3 opening for feeds, 4, main frame, 5, host housing, 6, blade, 7, inner lining material, 8, discharge port, 9, suction port, 10, left shaft holder, 11, central shaft 12, altitude mixture control support.
Fig. 1～2nd, the most preferred embodiment of surface strengthening device of the present invention, the present invention will be further described below in conjunction with accompanying drawing 1～2:
Embodiment
1) with mass percent be: C:0.19%, Si:0.17%, Mn:0.65%, Cr:0.83%, S≤0.030%, P≤0.025%, all the other for the cast steel ball raw material weighing of Fe batching and in electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into, adopts to add the 0.015Wt% aluminium deoxidation;
3) with centrifugal casting with step 2) molten steel becomes the water drop, drop becomes sphere under the capillary effect of molten steel, fall into the cast steel ball that cooling ball pond forms the low shellfish of work in-process as cast condition;
4) from the pond, pull the low shellfish cast steel ball of work in-process as cast condition out, the oven dry of drying stove, water content is less than 0.2Wt%;
5) shot after will drying sieves, and obtains the coarse fodder work in-process of different size;
6) the work in-process as cast condition of oven dry is hanged down the shellfish shot 900 ℃ of heating, be incubated after 30 minutes, in water, cool off and quench, will hang down the shellfish shot after the quenching, be incubated and carried out shot that tempering obtains tempering lath martensite+bainite in 60 minutes to detect hardness be 44.6HRC 300 ℃ of heating;
7) will hang down the shellfish shot and strengthen with the abrasive material intensifying device, and blow away impurity or suction cleaner is inhaled decon with blower, 5 minutes, product 1/3 diameter place hardness reached 50HRC, obtain outer hard in tough low shellfish reinforced steel shot.With Almen test piece test specification is the shot of S550, and strengthening back test piece camber value is 0.33mm.Recording the ERVIN life value with 100% method of substitution is 3680 times.This kind shot is shock-resistant flexible again, can be used for surface strengthening, ball blast of foundry goods, forging, thermal treatment part etc. etc.
8) the fine screen packing makes finished product.
Comparative Examples 1:
With mass percent be: C:0.19%, Si:0.17%, Mn:0.65%, S≤0.030%, P≤0.025%, all the other for the raw material weighing of Fe batching and in electric arc furnace melting be by embodiment 1 processing step 1 behind the molten steel)～5) be made into cast steel ball, after testing, do not add the Cr element, and the cast steel ball hardness that reinforcement is not processed through the abrasive material intensifying device is HRC35～39.With Almen test piece test specification is the shot of S550, and test piece camber value is 0.25mm.Recording the ERVIN life value with 100% method of substitution is 3250 times.
1) with mass percent be: C:0.15%, Si:0.31%, Mn:0.51%, S:0.028%, P:0.019%, Cr:0.88%, all the other for the raw material weighing of Fe batching and in electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into, adopts to add the 0.015Wt% aluminium deoxidation;
3) with centrifugal casting with step 2) molten steel becomes the water drop, drop becomes sphere under the capillary effect of molten steel, fall into the cast steel ball that cooling ball pond forms the low shellfish of work in-process as cast condition;
4) from the pond, pull the low shellfish cast steel ball of work in-process as cast condition out, the oven dry of drying stove, water content is less than 0.2Wt%;
5) shot after will drying sieves, and obtains the coarse fodder work in-process of different size;
6) shot after will drying is incubated after 30-40 minute 880 ℃ of heating, cools off in water and quenches, and after the quenching shot is obtained low shellfish shot in 60 minutes 260-280 ℃ of tempering insulation, and detection hardness is 41HRC;
7) will hang down the shellfish shot and strengthen 5 minutes with the abrasive material intensifying device, suction cleaner sucking-off impurity, the hardness at product 1/3 diameter place, processing back reaches 45HRC.Make anti-fragmentation, low shellfish shot shock-resistant, flexible again.With Almen test piece test specification is the shot of S550, and test piece camber value is 0.31mm, and recording the ERVIN life value with 100% method of substitution is 3890 times.Can be used for surface strengthening, ball blast of foundry goods, forging, thermal treatment part etc. etc.
8) the fine screen packing makes finished product.
1) with mass percent be: C:0.17%, Si:0.20%, Mn:0.55%, S:0.019%, P:0.023%, Cr:0.75%, all the other for the raw material weighing of Fe batching and in electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into, adopts to add the 0.015Wt% aluminium deoxidation;
3) with centrifugal casting with step 2) molten steel becomes the water drop, drop becomes sphere under the capillary effect of molten steel, fall into the cast steel ball that cooling ball pond forms the low shellfish of work in-process as cast condition;
4) from the pond, pull the low shellfish cast steel ball of work in-process as cast condition out, the oven dry of drying stove, water content is less than 0.2Wt%;
5) shot after will drying sieves, and obtains the coarse fodder work in-process of different size;
6) shot after will drying is incubated after 30-40 minute 880 ℃ of heating, cools off in water and quenches, and after the quenching shot is obtained low shellfish shot in 60 minutes 280-300 ℃ of tempering insulation, and detection hardness is 43.8HRC;
7) will hang down the shellfish shot and strengthen 5 minutes with the abrasive material intensifying device, suction cleaner sucking-off impurity, the hardness at product 1/3 diameter place, processing back reaches 49HRC.With Almen test piece test specification is the shot of S550, and test piece camber value is 0.32mm, and recording the ERVIN life value with 100% method of substitution is 3750 times.Make anti-fragmentation, low shellfish shot shock-resistant, flexible again.Can be used for surface strengthening, ball blast of foundry goods, forging, thermal treatment part etc. etc.
8) the fine screen packing makes finished product.
1) with mass percent be: C:0.13%, Si:0.15%, Mn:0.65%, S:0.022%, P:0.021%, Cr:0.79%, all the other for the raw material weighing of Fe batching and in electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into, adopts to add the 0.015Wt% aluminium deoxidation;
3) with centrifugal casting with step 2) molten steel becomes the water drop, drop becomes sphere under the capillary effect of molten steel, fall into the cast steel ball that cooling ball pond forms the low shellfish of work in-process as cast condition;
4) from the pond, pull the low shellfish cast steel ball of work in-process as cast condition out, the oven dry of drying stove, water content is less than 0.2Wt%;
5) shot after will drying sieves, and obtains the coarse fodder work in-process of different size;
6) shot after will drying is incubated after 30-40 minute 880 ℃ of heating, cools off in water and quenches, and after the quenching shot is obtained low shellfish shot in 60 minutes 160-180 ℃ of tempering insulation, and detection hardness is 39.8HRC;
7) will hang down the shellfish shot and strengthen 5 minutes with the abrasive material intensifying device, suction cleaner sucking-off impurity, the hardness at product 1/3 diameter place, processing back reaches 43HRC.With Almen test piece test specification is the shot of S550, and test piece camber value is 0.30mm, and recording the ERVIN life value with 100% method of substitution is 4130 times.Make anti-fragmentation, low shellfish shot shock-resistant, flexible again.Can be used for surface strengthening, ball blast of foundry goods, forging, thermal treatment part etc. etc.
8) the fine screen packing makes finished product.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (8)
1. one kind low shellfish cast steel ball is characterized in that its quality percentage composition is: C:0.10～0.20%, and Si:0.17～0.37%, Mn:0.35～0.65%, Cr:0.7～1.10%, S≤0.035%, P≤0.035%, all the other are Fe and unavoidable impurities.
2. low shellfish cast steel ball according to claim 1 is characterized in that its quality percentage composition is: C:0.19%, and Si:0.17%, Mn:0.65%, Cr:0.83%, S≤0.030%, P≤0.025%, all the other are Fe and unavoidable impurities.
3. low shellfish cast steel ball according to claim 1 and 2 is characterized in that adopting following processing step preparation:
1) with raw material weighing batching and in middle frequency furnace or electric arc furnace melting be molten steel;
2) molten steel that step 1) is obtained is poured tundish into and is adopted aluminium deoxidation;
3) adopting centrifugal atomizing or water slug atomization, with step 2) molten steel after the deoxidation becomes drop, and drop becomes sphere under the capillary effect of molten steel, fall into the cooling basin and be frozen into the as cast condition cast steel ball;
4) from the cooling basin, pull oven dry of as cast condition cast steel ball and screening out;
5) the as cast condition cast steel ball after will drying and sieve is 860-930 ℃ of heating, is incubated after 30-40 minute in water cooling and carries out quench treatment, makes the heterogeneous structure cast steel ball of being made up of lath martensite and bainite;
6) cast steel ball after will quenching is incubated 30-60 minute and carries out temper under 150-480 ℃ of temperature;
7) input speed during with 1～1.5t/ adds in the surface strengthening device with the cast steel ball after the tempering, work strengthening 3-5 minute;
8) cast steel ball after the intensive treatment is packed.
4. the surface strengthening device of a low shellfish cast steel ball, it is characterized in that: the bracing or strutting arrangement that comprises motor (1), transmission mechanism, main frame (4) and support main frame (4), described main frame (4) is a hollow cylinder that tilts to the lower right, the center is provided with central shaft (11), be set with blade (6) on the central shaft (11), main frame (4) top left end is provided with opening for feed (3), right-hand member is provided with suction port (9), and the right-hand member below is provided with discharge port (8).
5. surface strengthening device according to claim 4 is characterized in that: described main frame (4) is 1～2.5 ° to the angle of inclination, lower right.
6. surface strengthening device according to claim 4 is characterized in that: described main frame (4) lateral length is 1.0～1.5m, and diameter is 500～700mm.
7. surface strengthening device according to claim 4, it is characterized in that: described bracing or strutting arrangement is for being installed in the left and right bearing support (2,10) of main frame (4) both sides, central shaft (11) two ends, the left and right sides are respectively charged in the dead eye of left and right bearing support (2,10), and the below, bottom surface of left and right bearing support (2,10) is respectively equipped with altitude mixture control support (12).
8. surface strengthening device according to claim 4 is characterized in that: described blade (6) rotating speed is 1000～1500 rev/mins.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105385961A (en) * | 2015-12-16 | 2016-03-09 | 淄博鲁宝金属制品有限公司 | Wear-resisting low-carbon steel shot, preparation method thereof and centrifugal atomizing device |
| CN106555116A (en) * | 2016-11-29 | 2017-04-05 | 连云港倍特超微粉有限公司 | A kind of steel casting surface Hardening Treatment antifriction alloy shot and preparation method thereof |
| CN115074637A (en) * | 2022-06-25 | 2022-09-20 | 上海交通大学 | Ultrahigh-strength high-toughness superfine-structure low-carbon low-alloy steel and preparation method thereof |
| CN115401204A (en) * | 2022-08-17 | 2022-11-29 | 芜湖县天海耐火炉料有限公司 | Silicon-carbon alloy ball and production process thereof |
| CN115415535A (en) * | 2022-11-04 | 2022-12-02 | 山东耀周研磨材料股份有限公司 | Production method of bainite steel shot |
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| CN105385961A (en) * | 2015-12-16 | 2016-03-09 | 淄博鲁宝金属制品有限公司 | Wear-resisting low-carbon steel shot, preparation method thereof and centrifugal atomizing device |
| CN106555116A (en) * | 2016-11-29 | 2017-04-05 | 连云港倍特超微粉有限公司 | A kind of steel casting surface Hardening Treatment antifriction alloy shot and preparation method thereof |
| CN115074637A (en) * | 2022-06-25 | 2022-09-20 | 上海交通大学 | Ultrahigh-strength high-toughness superfine-structure low-carbon low-alloy steel and preparation method thereof |
| CN115401204A (en) * | 2022-08-17 | 2022-11-29 | 芜湖县天海耐火炉料有限公司 | Silicon-carbon alloy ball and production process thereof |
| CN115415535A (en) * | 2022-11-04 | 2022-12-02 | 山东耀周研磨材料股份有限公司 | Production method of bainite steel shot |
| CN115415535B (en) * | 2022-11-04 | 2023-01-06 | 山东耀周研磨材料股份有限公司 | Production method of bainite steel shot |
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Denomination of invention: Low bainite cast steel shots and surface strengthening device thereof Effective date of registration: 20150909 Granted publication date: 20121205 Pledgee: Zibo Xinrun financing Company limited by guarantee Pledgor: Zibo TAA Metal Technology Co., Ltd. Registration number: 2015980000215 |
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Date of cancellation: 20160713 Granted publication date: 20121205 Pledgee: Zibo Xinrun financing Company limited by guarantee Pledgor: Zibo TAA Metal Technology Co., Ltd. Registration number: 2015980000215 |
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