CN102837165B - Manufacturing method for final-stage driving gear of high-power coal mining machine - Google Patents
Manufacturing method for final-stage driving gear of high-power coal mining machine Download PDFInfo
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Abstract
The invention discloses a manufacturing method for a final-stage driving gear of a high-power coal mining machine. The manufacturing method comprises the following steps: selecting raw material proportion; performing vacuum degassing refining; smelting and casting electric slag; forging; performing preheating treatment; machining; cutting wires; finish-milling; subsequently heating; and performing shot-blasting treatment. According to the manufacturing method provided by the invention, the chemical component of the gear is reasonably selected, an electro-slag smelting casting technology is adopted for increasing the purity of the molten steel and the parameter selection of the heating technology, especially the carburizing technology, is optimized, so that the surface hardness of the gear end-product can reach HRC55-61, the hardness of the core part can reach HRC 30-42, the tensile strength is maintained in the scope of 1100-1250MPa, the impacting power can reach 110-136J, the whole mechanical property is excellent and the service life is effectively prolonged.
Description
Technical field
The present invention relates to a kind of manufacture method of gear, particularly the manufacture method of high-power coal cutter final stage travelling gear, belongs to metal material processing technical field.
Background technology
The high-power coal cutter of installation general power more than 1500KW, the design of its driving member, material select and manufacturing process is all machine industry highest level.Gear is vital part in plant equipment, requires the existing good wearability of gear, possesses again high anti-contact fatigue and fatigue property.The quality of gear quality, depends on gear material and processing mode thereof to a great extent.The electric steel of take in prior art forges as raw material, then processes front heat treatment, Gear Processing and heat treatment, and last shot-peening obtains gear finished product.The gear part of producing like this can substantially meet operating mode demand on middle low power coal-winning machine.But due to the raising of high-power coal cutter reliability requirement, the performance of gear part is also had to higher requirement, production and processing mode originally cannot meet this requirement, be mainly reflected in 2 points:
Raw material are because alloying component many (particularly improving the existence of quenching degree alloying elements cr, Ni, W) makes the quenching degree of this material fine.Under air cooling condition, also can obtain M tissue, add phosphorus content higher, core hardness after carburizing and quenching is very high, and most of more than 44HRC, toughness index obviously declines, cause gear in use to lose efficacy in advance, finally with cracking, fracture tooth, come to an end.
Former manufacturing process adopts common electric steel, density, the uniformity, degree of purity are not high, non-metallic inclusion inevitably exists with some, certain distribution form, and the segregation in general firm material inevitably exists with loose, thereby causes the decline of the mechanical property of material.
Gear, when tooth portion processing and forming, is processed as final molding with line cutting in addition.Line cutting harm nickeliferous to high-hardenability and that material tungsten produces is huge.Material surface produces micro-flaw on the one hand, and material will produce anti-stress on the other hand.Gear is under the effect of alternate load, and its surface microscopic is uneven, and concavo-convex place and blemish place and apparent line cutting groove mark place very easily cause the expansion that stress is concentrated and produce fatigue crack or micro-flaw, cause the fatigue rupture of part.
Aspect heat treatment process, owing to being subject to the impact of traditional handicraft, surface carbon concentration is higher, and it is not too desirable causing thus metallographic structure, and particularly the rank of carbide, all at 2～3 grades, even reaches 4 grades sometimes.Along with carbide grade, other raises, and fatigue strength will decline.During gear disabled analysis, be often that fatigue crack occurs on the crystal boundary of carbide gathering.Relation between carbide rank and fatigue life cycle, can be clear that, when carbide rank surpasses 2 grades, fatigue and cyclic cycle starts to decline, and carbide surpasses 3 grades even 4 grades time, and fatigue and cyclic cycle starts to have obvious downward trend.Due to carbide grade, other increases, and flank of tooth contact fatigue and flexural fatigue are on a declining curve, and case crush, cracking, fracture obviously increase.
Summary of the invention
The object of this invention is to provide and a kind ofly can improve gear part fatigue strength, improve the manufacture method that mechanical property improves the high-power coal cutter final stage travelling gear in service life.
For achieving the above object, technical scheme of the present invention is such: a kind of manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.12～0.15%, Cr:1.35～1.45%, Si:0.20～0.30%, Mn:0.30～0.50%, W:0.85～1.00%, Ni:4.05～4.40%, P:0～0.015%, S:0～0.010%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are carried out to vacuum deaeration refining, then carry out electroslag smelting casting and obtain steel ingot;
Step 2: steel ingot is forged into gear blank, and forging ratio > 3;
Step 3: gear blank is carried out carrying out Pre-heat treatment process after mechanical roughing, described Pre-heat treatment process comprises normalizing process and tempering process, described normalizing process for by gear blank be heated to 930～960 ℃ insulation 4～7 hours after air cooling, described tempering process for by gear blank be heated to 660～690 ℃ insulation 4.5～7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, and machining comprises carries out roughing, fine finishining and spark machined to gear blank;
Step 5: the gear blank after machining is carried out the processing of line excision forming and leaves certain surplus, then its finish-milling is machined to specification requirement size;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, described subsequent heat treatment is for being heated to gear 910～940 ℃ of carburizing insulations 80～140 hours, the air cooling of coming out of the stove after cooling to 850～900 ℃ with the furnace, then carry out tempering, described tempering for by gear be heated to 650～680 ℃ insulation 4～7 hours after air cooling, quench again, described quenching for by gear be heated to 765～830 ℃ insulation 180～240 minutes after quenching oil be chilled to room temperature, pass through again-70 ± 1 ℃ of cold treatments 2～5 hours, be finally heated to 200～280 ℃ of air coolings of coming out of the stove to room temperature;
Step 7: gear is carried out to reinforced peening processing and obtain gear finished product.
For the inner cutting stress producing of gear blank during machining in removal process four, prevent blank deformation or cracking, in described step 5, carry out before the processing of line excision forming, gear blank is carried out to stress-removal tempering for the first time, the tempering of described stress-removal be for the first time be heated to 600～650 ℃ insulation 4～6 hours after air cooling.
For removal process five middle gear cutting on lines processing and finish-milling add the cutting stress in man-hour, in described step 6, carry out before subsequent heat treatment, gear blank is carried out to stress-removal tempering for the second time, the tempering of described stress-removal be for the second time be heated to 500～550 ℃ insulation 4～6 hours after air cooling.
Preferably, in described step 6, quenching oil carried out cold treatment after being chilled to room temperature in 4～8 hours.
Preferably, in described step 6, after cold treatment, gear is placed on and in hot water, is warming up to room temperature.
Further for the effect of bead in Optimization Steps seven, in described step 7, compressed air shotblasting machine operating current is set as 18～22A, 9～30 minutes shot-peening time, coverage rate >=100% during reinforced peening.
The performance of gear determines by metallographic structure, and this depends on chemical composition, smelting mode and Technology for Heating Processing.In the present invention, according to the role of each element, determine its mass percent, wherein:
C: main intensified element in steel, has solution strengthening or form carbide dispersion-strengthened.Along with the increase of phosphorus content, in tissue, the quantity of carbide increases, and size strengthens, and space of carbides dwindles.Along with the increase of phosphorus content, the carbide in tissue increases in addition, and wearability improves, and concentration improves, but toughness and plasticity index reduce.
Si: deoxidier, solution strengthening element, favourable raising matrix strength, improves the wearability of gear, and silicon is the generation banded structure in steel easily, thereby makes steel lateral performance lower than longitudinal performance, and brittle transition temperature is raise, and toughness declines.
Cr: carbide former, can increase quenching degree, there is solution strengthening effect.The increase of chromium can effectively increase the quantity of carbide, is conducive to wearability and the hardness of gear material, and the raising of intensity.But added the toughness of multipair gear material and plasticity to have disadvantageous effect.
Mn: deoxidier, fixed carbon forms MnS, can remove FeS and form hot-shortly, increase quenching degree, but manganese too high levels can increase superheated susceptivity.
Ni: main malleableize element, reduces phase transition temperature and increases quenching degree.After nickel addition too much causes material carburizing and quenching, retained austenite is increased, and affects case hardness and wearability.
W: carbide, crystal grain thinning, the degree of depth and the toughness of raising wearability and steel.Shortcoming is that too much tungsten makes the surface of carburizing and quenching have a large amount of A, makes heat treatment complicated.
S and P: harmful element sulphur and phosphorus are the inevitable trace impurities of bringing in raw material.Phosphorus is surface-active impurity, serious at crystal boundary and boundary segregation, often reaches the tens of to thousands of times of mean concentration.Form mainly with phosphide in steel exists, and for large absolutely number steel, at room temperature the plasticity of steel, toughness sharply decline, and steel are produced cold short.The content of sulphur and sulfide increases the various toughness indexs that reduce material, and the fracture toughness of steel declines along with the increase of the amount of inclusions or length.The molten point of sulfide is low, makes steel die separation in hot procedure, causes Materials Fracture, forms hot-short phenomenon.Sulphur makes solderability, impact flexibility, fatigue durability and anticorrosive all reductions of steel.
The present invention adopts electroslag smelting casting to improve the purity of steel when raw material is smelted, and the content that reduces harmful element sulphur makes surface of steel ingot smooth, and even tissue is fine and close, and metallographic structure is even, for subsequent fabrication steps provides good material foundation.
Due to as described in the background art, the gear surface of line excision forming easily produces micro-flaw, gear is under the effect of alternate load, its surface microscopic is uneven, concavo-convex place and blemish place and apparent line cutting groove mark place very easily cause the expansion that stress is concentrated and produce fatigue crack or micro-flaw, cause the fatigue rupture of part.Therefore in step 5 of the present invention, adopt line excision forming and leave certain surplus then to adopt finish-milling to machine final molding, reduced as much as possible the micro-flaw of piece surface.
The present invention is by the particularly selection of technological parameter during carburizing of each Technology for Heating Processing, effectively controlled carbide grade in below 2 grades, avoid the flank of tooth contact fatigue that causes because of other increase of carbide grade and the decline of fatigue property, and case crush, cracking, fracture obviously increase.
The advantage of the manufacture method of high-power coal cutter final stage travelling gear of the present invention is, gear chemical composition of the finished product forms rationally, case hardness reaches HRC55～61, core hardness reaches HRC30～42, tensile strength remains on 1100～1250Mpa, ballistic work reaches 110～136J, and whole mechanics excellent performance, effectively improves service life.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
The manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.12%, Cr:1.35%, Si:0.20%, Mn:0.30%, W:0.85%, Ni:4.05%, P:0.015%, S:0.010%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are dropped into just furnace and after smelting, through vacuum degassing refining furnace, carry out Fruit storage, deoxidization desulfuration improves Molten Steel Cleanliness, the needed consutrode of electroslag smelting casting is cast or forged into steel by vacuum deaeration refining, then adopt electroslag casting process to carry out melting, consutrode termination is melted gradually, motlten metal pools drop, through slag bath, fall into crystallizer, form metal bath, be subject to water-cooled effect, solidify rapidly formation steel ingot,
Step 2: adopt hydraulic press that steel ingot is forged into gear blank, forging ratio > 3;
Step 3: gear blank is carried out carrying out heat treatment in advance after mechanical roughing, comprise normalizing and tempering processing.First carry out normalized treatment, by gear blank be heated to 930 ℃ insulation 4 hours after air cooling, then carry out temper, by gear blank be heated to 660 ℃ insulation 4.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, comprise roughing, fine finishining and spark machined;
Step 5: use WEDM to carry out the processing of line excision forming and leave certain surplus to the gear blank after machining, then carry out finish-milling through CNC milling machine and be machined to specification requirement size;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, be about to gear and be heated to 910 ℃ of carburizing insulations 80 hours, the air cooling of coming out of the stove after cooling to 850 ℃ with the furnace, then carry out tempering, by gear be heated to 650 ℃ insulation 4 hours after air cooling, quench again, by gear be heated to 765 ℃ insulation 180 minutes after quenching oil be chilled to room temperature, and in 4 hours through-70 ± 1 ℃ of cold treatment 2 hours, after cold treatment, gear is placed in hot water and is warming up to room temperature, be finally heated to 200 ℃ of tempering and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 carries out reinforced peening to gear to be processed and obtain gear finished product, and during reinforced peening, compressed air shotblasting machine operating current is set as 18A, 9 minutes shot-peening time, coverage rate >=100%.
The gear finished product metallographic structure that the present embodiment obtains and mechanical property in Table 1, table 2
Table 1: embodiment 1 metallographic structure
Table 2 embodiment 1 mechanical property
Embodiment 2:
The manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.15%, Cr:1.37%, Si:0.23%, Mn:0.36%, W:0.92%, Ni:4.23%, P:0.014%, S:0.006%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are dropped into just furnace and after smelting, through vacuum degassing refining furnace, carry out Fruit storage, deoxidization desulfuration improves Molten Steel Cleanliness, the needed consutrode of electroslag smelting casting is cast or forged into steel by vacuum deaeration refining, then adopt electroslag casting process to carry out melting, consutrode termination is melted gradually, motlten metal pools drop, through slag bath, fall into crystallizer, form metal bath, be subject to water-cooled effect, solidify rapidly formation steel ingot,
Step 2: adopt hydraulic press that steel ingot is forged into gear blank, forging ratio > 3;
Step 3: gear blank is carried out carrying out heat treatment in advance after mechanical roughing, comprise normalizing and tempering processing.First carry out normalized treatment, by gear blank be heated to 940 ℃ insulation 6.5 hours after air cooling, then carry out temper, by gear blank be heated to 665 ℃ insulation 7 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out to stress-removal tempering for the first time, by blank heating to 600 ℃ insulation air cooling after 4 hours;
Step 5: use WEDM to carry out the processing of line excision forming and leave certain surplus to the gear blank after machining, then through CNC milling machine, carry out finish-milling and be machined to specification requirement size, then gear blank is carried out to stress-removal tempering for the second time, by blank heating to 500 ℃ insulation air cooling after 4 hours;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, be about to gear and be heated to 915 ℃ of carburizing insulations 128 hours, the air cooling of coming out of the stove after cooling to 850 ℃ with the furnace, then carry out tempering, gear is heated to 650 ℃ of insulations air cooling after 6.5 hours, then quenches, by gear be heated to 770 ℃ of insulations after 220 minutes quenching oil be chilled to room temperature, and in 5.5 hours, pass through-70 ± 1 ℃ of cold treatment 2 hours, be finally heated to 200 ℃ of tempering and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 carries out reinforced peening to gear to be processed and obtain gear finished product, and during reinforced peening, compressed air shotblasting machine operating current is set as 21A, 10 minutes shot-peening time, coverage rate >=100%.
The gear finished product metallographic structure that the present embodiment obtains and mechanical property in Table 3, table 4
Table: 3: embodiment 5 metallographic structures
Table: 4: embodiment 5 mechanical properties
Embodiment 3:
The manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.13%, Cr:1.41%, Si:0.29%, Mn:0.38%, W:0.98%, Ni:4.13%, P:0.012%, S:0.009%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are dropped into just furnace and after smelting, through vacuum degassing refining furnace, carry out Fruit storage, deoxidization desulfuration improves Molten Steel Cleanliness, the needed consutrode of electroslag smelting casting is cast or forged into steel by vacuum deaeration refining, then adopt electroslag casting process to carry out melting, consutrode termination is melted gradually, motlten metal pools drop, through slag bath, fall into crystallizer, form metal bath, be subject to water-cooled effect, solidify rapidly formation steel ingot,
Step 2: adopt hydraulic press that steel ingot is forged into gear blank, forging ratio > 3;
Step 3: gear blank is carried out carrying out heat treatment in advance after mechanical roughing, comprise normalizing and tempering processing.First carry out normalized treatment, by gear blank be heated to 955 ℃ insulation 4.5 hours after air cooling, then carry out temper, by gear blank be heated to 675 ℃ insulation 5.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out to stress-removal tempering for the first time, by blank heating to 650 ℃ insulation air cooling after 5.5 hours;
Step 5: use WEDM to carry out the processing of line excision forming and leave certain surplus to the gear blank after machining, then through CNC milling machine, carry out finish-milling and be machined to specification requirement size, then gear blank is carried out to stress-removal tempering for the second time, by blank heating to 520 ℃ insulation air cooling after 6 hours;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, be about to gear and be heated to 935 ℃ of carburizing insulations 105 hours, the air cooling of coming out of the stove after cooling to 895 ℃ with the furnace, then carry out tempering, by gear be heated to 670 ℃ insulation 4.5 hours after air cooling, quench again, by gear be heated to 810 ℃ insulation 190 minutes after quenching oil be chilled to room temperature, and in 8 hours through-70 ± 1 ℃ of cold treatment 4 hours, after cold treatment, gear is placed in hot water and is warming up to room temperature, be finally heated to 250 ℃ of tempering and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 carries out reinforced peening to gear to be processed and obtain gear finished product, and during reinforced peening, compressed air shotblasting machine operating current is set as 18A, 22 minutes shot-peening time, coverage rate >=100%.
The gear finished product metallographic structure that the present embodiment obtains and mechanical property in Table 5, table 6
Table 5: embodiment 3 metallographic structures
Table 6: embodiment 3 mechanical properties
Embodiment 4:
The manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.14%, Cr:1.44%, Si:0.30%, Mn:0.45%, W:0.96%, Ni:4.40%, P:0.003%, S:0.002%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are dropped into just furnace and after smelting, through vacuum degassing refining furnace, carry out Fruit storage, deoxidization desulfuration improves Molten Steel Cleanliness, the needed consutrode of electroslag smelting casting is cast or forged into steel by vacuum deaeration refining, then adopt electroslag casting process to carry out melting, consutrode termination is melted gradually, motlten metal pools drop, through slag bath, fall into crystallizer, form metal bath, be subject to water-cooled effect, solidify rapidly formation steel ingot,
Step 2: adopt hydraulic press that steel ingot is forged into gear blank, forging ratio > 3;
Step 3: gear blank is carried out carrying out heat treatment in advance after mechanical roughing, comprise normalizing and tempering processing.First carry out normalized treatment, by gear blank be heated to 955 ℃ insulation 6 hours after air cooling, then carry out temper, by gear blank be heated to 690 ℃ insulation 7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out to stress-removal tempering for the first time, by blank heating to 630 ℃ insulation air cooling after 6 hours;
Step 5: use WEDM to carry out the processing of line excision forming and leave certain surplus to the gear blank after machining, then through CNC milling machine, carry out finish-milling and be machined to specification requirement size, then gear blank is carried out to stress-removal tempering for the second time, by blank heating to 550 ℃ insulation air cooling after 4.5 hours;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, be about to gear and be heated to 920 ℃ of carburizing insulations 140 hours, the air cooling of coming out of the stove after cooling to 900 ℃ with the furnace, then carry out tempering, by gear be heated to 680 ℃ insulation 7 hours after air cooling, quench again, by gear be heated to 820 ℃ insulation 240 minutes after quenching oil be chilled to room temperature, and in 6.5 hours through-70 ± 1 ℃ of cold treatment 4.5 hours, after cold treatment, gear is placed in hot water and is warming up to room temperature, be finally heated to 260 ℃ of tempering and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 carries out reinforced peening to gear to be processed and obtain gear finished product, and during reinforced peening, compressed air shotblasting machine operating current is set as 20A, 20 minutes shot-peening time, coverage rate >=100%.
The gear finished product metallographic structure that the present embodiment obtains and mechanical property in Table 7, table 8
Table: 7: embodiment 4 metallographic structures
Table 8: embodiment 4 mechanical properties
Embodiment 5
The manufacture method of high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.15%, Cr:1.45%, Si:0.25%, Mn:0.50%, W:1.00%, Ni:4.31%, P:0.004%, S:0.005%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are dropped into just furnace and after smelting, through vacuum degassing refining furnace, carry out Fruit storage, deoxidization desulfuration improves Molten Steel Cleanliness, the needed consutrode of electroslag smelting casting is cast or forged into steel by vacuum deaeration refining, then adopt electroslag casting process to carry out melting, consutrode termination is melted gradually, motlten metal pools drop, through slag bath, fall into crystallizer, form metal bath, be subject to water-cooled effect, solidify rapidly formation steel ingot,
Step 2: adopt hydraulic press that steel ingot is forged into gear blank, forging ratio > 3;
Step 3: gear blank is carried out carrying out heat treatment in advance after mechanical roughing, comprise normalizing and tempering processing.First carry out normalized treatment, by gear blank be heated to 960 ℃ insulation 7 hours after air cooling, then carry out temper, by gear blank be heated to 680 ℃ insulation 6.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining, comprise roughing, fine finishining and spark machined;
Step 5: use WEDM to carry out the processing of line excision forming and leave certain surplus to the gear blank after machining, then carry out finish-milling through CNC milling machine and be machined to specification requirement size;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, be about to gear and be heated to 940 ℃ of carburizing insulations 128 hours, the air cooling of coming out of the stove after cooling to 870 ℃ with the furnace, then carry out tempering, gear is heated to 680 ℃ of insulations air cooling after 7 hours, then quenches, by gear be heated to 830 ℃ of insulations after 240 minutes quenching oil be chilled to room temperature, and in 7 hours, pass through-70 ± 1 ℃ of cold treatment 5 hours, be finally heated to 280 ℃ of tempering and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 carries out reinforced peening to gear to be processed and obtain gear finished product, and during reinforced peening, compressed air shotblasting machine operating current is set as 22A, 30 minutes shot-peening time, coverage rate >=100%.
The gear finished product metallographic structure that the present embodiment obtains and mechanical property in Table 9, table 10
Table 9: embodiment 5 metallographic structures
Table 10: embodiment 5 mechanical properties
Claims (4)
1. a manufacture method for high-power coal cutter final stage travelling gear, is characterized in that comprising the steps:
Step 1: raw material are pressed to following mass percent component batching C:0.12～0.15%, Cr:1.35～1.45%, Si:0.20～0.30%, Mn:0.30～0.50%, W:0.85～1.00%, Ni:4.05～4.40%, P:0～0.015%, S:0～0.010%, all the other are Fe, to entering the running gate system of stove raw and auxiliary material, be fully dried, clean, the raw material of selection are carried out to vacuum deaeration refining, then carry out electroslag smelting casting and obtain steel ingot;
Step 2: steel ingot is forged into gear blank, and forging ratio > 3;
Step 3: gear blank is carried out carrying out Pre-heat treatment process after mechanical roughing, described Pre-heat treatment process comprises normalizing process and tempering process, described normalizing process for by gear blank be heated to 930～960 ℃ insulation 4～7 hours after air cooling, described tempering process for by gear blank be heated to 660～690 ℃ insulation 4.5～7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out to machining;
Step 5: the gear blank after machining is carried out the processing of line excision forming and leaves certain surplus, then its finish-milling is machined to specification requirement size, carry out before the processing of line excision forming, gear blank is carried out to stress-removal tempering for the first time, the tempering of described stress-removal be for the first time be heated to 600～650 ℃ insulation 4～6 hours after air cooling;
Step 6: the gear after finish-milling processing is carried out to subsequent heat treatment, described subsequent heat treatment is for being heated to gear 910～940 ℃ of carburizing insulations 80～140 hours, the air cooling of coming out of the stove after cooling to 850～900 ℃ with the furnace, then carry out tempering, described tempering for by gear be heated to 650～680 ℃ insulation 4～7 hours after air cooling, quench again, described quenching for by gear be heated to 765～830 ℃ insulation 180～240 minutes after quenching oil be chilled to room temperature, pass through again-70 ± 1 ℃ of cold treatments 2～5 hours, finally be heated to 200～280 ℃ of tempering and come out of the stove air cooling to room temperature, carry out before subsequent heat treatment, gear blank is carried out to stress-removal tempering for the second time, the tempering of described stress-removal be for the second time be heated to 500～550 ℃ insulation 4～6 hours after air cooling,
Step 7: gear is carried out to reinforced peening processing and obtain gear finished product.
2. the manufacture method of high-power coal cutter final stage travelling gear according to claim 1, is characterized in that: in described step 6, quenching oil carried out cold treatment after being chilled to room temperature in 4～8 hours.
3. the manufacture method of high-power coal cutter final stage travelling gear according to claim 1, is characterized in that: in described step 6, after cold treatment, gear is placed on and in hot water, is warming up to room temperature.
4. the manufacture method of high-power coal cutter final stage travelling gear according to claim 1, is characterized in that: in described step 7, compressed air shotblasting machine operating current is set as 18～22A, 9～30 minutes shot-peening time, coverage rate >=100% during reinforced peening.
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| CN102226254B (en) * | 2011-06-10 | 2013-03-20 | 钢铁研究总院 | High-strength high-toughness anticorrosion high-temperature bearing/pinion steel and preparation method thereof |
| CN102501035A (en) * | 2011-10-12 | 2012-06-20 | 南京金鑫传动设备有限公司 | Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface |
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| CN109321739A (en) * | 2018-12-04 | 2019-02-12 | 常熟天地煤机装备有限公司 | A kind of heat-treatment processing process of big infiltration layer heavy-duty gear |
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