CN102837165A - 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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- CN102837165A CN102837165A CN2012103650040A CN201210365004A CN102837165A CN 102837165 A CN102837165 A CN 102837165A CN 2012103650040 A CN2012103650040 A CN 2012103650040A CN 201210365004 A CN201210365004 A CN 201210365004A CN 102837165 A CN102837165 A CN 102837165A
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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 manufacturing approach of gear, particularly the manufacturing approach of high-power coal cutter final stage travelling gear belongs to the 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 all is the machine industry highest level.Gear is a vital part in the plant equipment, requires the existing good wearability of gear, possesses high anti-contact fatigue and flexural fatigue performance again.The quality of gear quality depends on gear material and processing mode thereof to a great extent.Be that raw material forge with electric steel in the prior art, process preceding heat treatment, Gear Processing and heat treatment then, last shot-peening obtains the gear finished product.The gear part of producing like this can satisfy the operating mode demand basically on the middle low power coal-winning machine.But because the raising of high-power coal cutter reliability requirement, the performance of gear part is also had higher requirement, production and processing mode originally can't satisfy this requirement, is 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 that the quenching degree of this material is fine.Under the air cooling condition, also can obtain the M tissue, add phosphorus content than higher; Core hardness behind carburizing and quenching is very high, and most of more than 44HRC, toughness index obviously descends; Cause gear in use to lose efficacy in advance, finally come to an end with cracking, fracture tooth.
Former manufacturing process adopts common electric steel; Density, the uniformity, degree of purity are not high; Non-metallic inclusion exists with some, certain distributed form inevitably, and the segregation in the general firm material exists with loose inevitably, thereby causes the decline of the mechanical property of material.
Gear is processed as final molding with the line cutting when tooth portion processing and forming in addition.Line cuts nickeliferous to high-hardenability and the harm that material produced tungsten 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 receive the influence of traditional handicraft, surface carbon concentration is higher, and it is not too desirable causing metallographic structure thus, and particularly the rank of carbide is all at 2～3 grades, sometimes even reach 4 grades.Along with other rising of carbide grade, fatigue strength will descend.When gear failure is analyzed, often be that fatigue crack occurs on the crystal boundary of carbide gathering.Relation between carbide rank and fatigue life cycle can be clear that, when the carbide rank surpassed 2 grades, the fatigue and cyclic cycle began to descend, and when carbide surpassed 3 grades even 4 grades, the fatigue and cyclic cycle began to have obvious downward trend.Because other increase of carbide grade, 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 purpose of this invention is to provide and a kind ofly can improve gear part fatigue strength, improve the manufacturing approach that mechanical property improves the high-power coal cutter final stage travelling gear in service life.
For realizing the foregoing invention purpose, technical scheme of the present invention is such: a kind of manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: raw material are pressed 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; Running gate system to going into the stove raw and auxiliary material is carried out abundant drying, cleaning; The raw material of selecting are carried out vacuum deaeration refining, then carry out electroslag smelting casting and obtain steel ingot;
Step 2: steel ingot is forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out Technology for Heating Processing in advance after the mechanical roughing; Said Technology for Heating Processing in advance comprises normalizing process and tempering process; Said normalizing process for gear blank be heated to 930～960 ℃ the insulation 4～7 hours after air cooling, said tempering process for gear blank be heated to 660～690 ℃ the insulation 4.5～7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, and machining comprises carries out roughing, fine finishining and spark machined to gear blank;
Step 5: the gear blank after the machining is carried out the processing of line excision forming and leaves certain surplus, then its finish-milling is machined to the specification requirement size;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment; Said 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 carries out tempering then, and said tempering is for being heated to gear 650～680 ℃ of insulations air cooling after 4～7 hours; Quench again; Said quenching for gear be heated to 765～830 ℃ the insulation 180～240 minutes after quenching oil be chilled to room temperature, pass through-70 ± 1 ℃ of cold treatments 2～5 hours again, be heated to 200～280 ℃ of air cooling to room temperatures of coming out of the stove at last;
Step 7: gear is carried out the reinforced peening processing obtain the gear finished product.
For the inner cutting stress that produces of gear blank during machining in the removal process four; Prevent blank deformation or cracking; Before carrying out the processing of line excision forming in the said step 5; Gear blank is carried out the stress-removal tempering first time, the said stress-removal tempering first time be heated to 600～650 ℃ the insulation 4～6 hours after air cooling.
The cutting stress that adds man-hour for the online cutting processing of removal process five middle gears and finish-milling; Before carrying out subsequent heat treatment in the said step 6; Gear blank is carried out the stress-removal tempering second time, the said stress-removal tempering second time be heated to 500～550 ℃ the insulation 4～6 hours after air cooling.
Preferably, quenching oil carried out cold treatment after being chilled to room temperature in the said step 6 in 4～8 hours.
Preferably, after the cold treatment gear is placed in the said step 6 and is warming up to room temperature in the hot water.
Further for the effect of bead in the optimization step seven, in the said step 7 during reinforced peening compressed air shotblasting machine operating current be set at 18～22A, 9～30 minutes shot-peening time, coverage rate >=100%.
The performance of gear is by the metallographic structure decision, and this depends on chemical composition, smelting mode and Technology for Heating Processing.Confirm its mass percent according to the role of each element among the present invention, wherein:
C: main intensified element in the steel has solution strengthening or forms carbide dispersion-strengthened.Along with the increase of phosphorus content, the quantity of carbide increases in the tissue, oversized, and the carbide spacing is dwindled.Along with the increase of phosphorus content, the carbide in the tissue increases in addition, and wearability improves, and concentration improves, but toughness and plasticity index reduce.
Si: deoxidier, the solution strengthening element, favourable raising matrix strength improves the wearability of gear, and silicon is prone to the generation banded structure in steel, thereby makes the steel lateral performance be lower than vertical performance, and brittle transition temperature is raise, and toughness descends.
Cr: carbide former, can increase quenching degree, the solution strengthening effect is arranged.The increase of chromium can effectively increase the quantity of carbide, helps the wearability and the hardness of gear material, and the raising of intensity.But add too much toughness and plasticity unfavorable effect is arranged gear material.
Mn: deoxidier, fixed carbon form MnS, can remove FeS and form hot-shortly, increase quenching degree, but the manganese too high levels can increase superheated susceptivity.
Ni: main malleableize element, reduce phase transition temperature and increase quenching degree.Retained austenite was increased after the nickel addition too much caused the material carburizing and quenching, influenced case hardness and wearability.
W: strong carbide forming element, 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 the raw material.Phosphorus is surface-active impurity, and is serious at crystal boundary and boundary segregation, often reaches the tens of to thousands of times of mean concentration.Many forms with phosphide exist in steel, and as far as exhausted big number steel, at room temperature the plasticity of steel, toughness sharply descend, and it is cold short that steel are produced.The content of sulphur and sulfide increases the various toughness indexs that reduce material, and the fracture toughness of steel descends along with the increase of The amount of inclusions or length.It is low that sulfide dissolves point, makes steel die separation in hot procedure, causes the material 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.
Because described in background technology; The gear surface of line excision forming is prone to produce micro-flaw; Gear is under the effect of alternate load; 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.Therefore in the step 5 of the present invention, employing line excision forming also leaves certain surplus and adopts finish-milling to machine final molding then, has reduced the micro-flaw of piece surface as much as possible.
The present invention is through each Technology for Heating Processing selection of process parameters during carburizing particularly; Effectively having controlled carbide grade is in below 2 grades; Avoid the flank of tooth contact fatigue and the flexural fatigue performance decrease that cause because of other increase of carbide grade, and case crush, cracking, fracture increase obviously.
The advantage of the manufacturing approach of high-power coal cutter final stage travelling gear of the present invention is; Gear finished product chemical composition is formed rationally, and case hardness reaches HRC55～61, and 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 present invention is described further.
Embodiment 1:
The manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: by 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, and the running gate system of going into the stove raw and auxiliary material is carried out abundant drying, cleaning with raw material; Carry out vacuum outgas through vacuum degassing refining furnace after the raw material input furnace smelting just with selection and handle, deoxidization desulfuration improves the molten steel degree of purity, casts or forge into the needed consutrode of electroslag smelting casting to the steel through vacuum deaeration refining; Then adopt electroslag casting process to carry out melting; The consutrode termination is melted gradually, and motlten metal pools drop, passes slag bath; Fall into crystallizer; Form metal bath, receive the water-cooled effect, solidify the formation steel ingot rapidly;
Step 2: adopt hydraulic press steel ingot to be forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out heat treatment in advance after the mechanical roughing, comprise normalizing and temper.Carry out normalized treatment earlier, with gear blank be heated to 930 ℃ the insulation 4 hours after air cooling, carry out temper then, with gear blank be heated to 660 ℃ the insulation 4.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, comprise roughing, fine finishining and spark machined;
Step 5: use WEDM to carry out the line excision forming to the gear blank after the machining and process and leave certain surplus, then carry out finish-milling and be machined to the specification requirement size through CNC milling machine;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment; Be about to gear and be heated to 910 ℃ of carburizings insulations 80 hours, the air cooling of coming out of the stove after cooling to 850 ℃ with the furnace carries out tempering then; With gear be heated to 650 ℃ the insulation 4 hours after air cooling; Quench again, with gear be heated to 765 ℃ of insulations after 180 minutes quenching oil be chilled to room temperature, and in 4 hours through-70 ± 1 ℃ of cold treatment 2 hours; After the cold treatment gear is placed on and is warming up to room temperature in the hot water, be heated to 200 ℃ of tempering at last and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 for use carries out reinforced peening to gear to be handled and obtains the gear finished product, and the compressed air shotblasting machine operating current is set at 18A during reinforced peening, 9 minutes shot-peening time, coverage rate >=100%.
Metallographic structure of gear finished product and mechanical property that present embodiment obtains are seen table 1, table 2
Table 1: embodiment 1 metallographic structure
Table 2 embodiment 1 mechanical property
Embodiment 2:
The manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: by 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, and the running gate system of going into the stove raw and auxiliary material is carried out abundant drying, cleaning with raw material; Carry out vacuum outgas through vacuum degassing refining furnace after the raw material input furnace smelting just with selection and handle, deoxidization desulfuration improves the molten steel degree of purity, casts or forge into the needed consutrode of electroslag smelting casting to the steel through vacuum deaeration refining; Then adopt electroslag casting process to carry out melting; The consutrode termination is melted gradually, and motlten metal pools drop, passes slag bath; Fall into crystallizer; Form metal bath, receive the water-cooled effect, solidify the formation steel ingot rapidly;
Step 2: adopt hydraulic press steel ingot to be forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out heat treatment in advance after the mechanical roughing, comprise normalizing and temper.Carry out normalized treatment earlier, with gear blank be heated to 940 ℃ the insulation 6.5 hours after air cooling, carry out temper then, with gear blank be heated to 665 ℃ the insulation 7 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out the stress-removal tempering first time, with blank heating to 600 ℃ insulation air cooling after 4 hours;
Step 5: use WEDM to carry out the line excision forming to the gear blank after the machining and process and leave certain surplus; Then carry out finish-milling and be machined to the specification requirement size through CNC milling machine; Then gear blank is carried out the stress-removal tempering second time, with blank heating to 500 ℃ insulation air cooling after 4 hours;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment, is about to gear and is heated to 915 ℃ of carburizings insulations 128 hours, the air cooling of coming out of the stove after cooling to 850 ℃ with the furnace; Carry out tempering then; With gear be heated to 650 ℃ the insulation 6.5 hours after air cooling, quench again, with gear be heated to 770 ℃ the insulation 220 minutes after quenching oil be chilled to room temperature; And in 5.5 hours, pass through-70 ± 1 ℃ of cold treatment 2 hours, be heated to 200 ℃ of tempering at last and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 for use carries out reinforced peening to gear to be handled and obtains the gear finished product, and the compressed air shotblasting machine operating current is set at 21A during reinforced peening, 10 minutes shot-peening time, coverage rate >=100%.
Metallographic structure of gear finished product and mechanical property that present embodiment obtains are seen table 3, table 4
Table: 3: embodiment 5 metallographic structures
Table: 4: embodiment 5 mechanical properties
Embodiment 3:
The manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: by 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, and the running gate system of going into the stove raw and auxiliary material is carried out abundant drying, cleaning with raw material; Carry out vacuum outgas through vacuum degassing refining furnace after the raw material input furnace smelting just with selection and handle, deoxidization desulfuration improves the molten steel degree of purity, casts or forge into the needed consutrode of electroslag smelting casting to the steel through vacuum deaeration refining; Then adopt electroslag casting process to carry out melting; The consutrode termination is melted gradually, and motlten metal pools drop, passes slag bath; Fall into crystallizer; Form metal bath, receive the water-cooled effect, solidify the formation steel ingot rapidly;
Step 2: adopt hydraulic press steel ingot to be forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out heat treatment in advance after the mechanical roughing, comprise normalizing and temper.Carry out normalized treatment earlier, with gear blank be heated to 955 ℃ the insulation 4.5 hours after air cooling, carry out temper then, with gear blank be heated to 675 ℃ the insulation 5.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out the stress-removal tempering first time, with blank heating to 650 ℃ insulation air cooling after 5.5 hours;
Step 5: use WEDM to carry out the line excision forming to the gear blank after the machining and process and leave certain surplus; Then carry out finish-milling and be machined to the specification requirement size through CNC milling machine; Then gear blank is carried out the stress-removal tempering second time, with blank heating to 520 ℃ insulation air cooling after 6 hours;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment; Be about to gear and be heated to 935 ℃ of carburizings insulations 105 hours, the air cooling of coming out of the stove after cooling to 895 ℃ with the furnace carries out tempering then; With gear be heated to 670 ℃ the insulation 4.5 hours after air cooling; Quench again, with gear be heated to 810 ℃ of insulations after 190 minutes quenching oil be chilled to room temperature, and in 8 hours through-70 ± 1 ℃ of cold treatment 4 hours; After the cold treatment gear is placed on and is warming up to room temperature in the hot water, be heated to 250 ℃ of tempering at last and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 for use carries out reinforced peening to gear to be handled and obtains the gear finished product, and the compressed air shotblasting machine operating current is set at 18A during reinforced peening, 22 minutes shot-peening time, coverage rate >=100%.
Metallographic structure of gear finished product and mechanical property that present embodiment obtains are seen table 5, table 6
Table 5: embodiment 3 metallographic structures
Table 6: embodiment 3 mechanical properties
Embodiment 4:
The manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: by 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, and the running gate system of going into the stove raw and auxiliary material is carried out abundant drying, cleaning with raw material; Carry out vacuum outgas through vacuum degassing refining furnace after the raw material input furnace smelting just with selection and handle, deoxidization desulfuration improves the molten steel degree of purity, casts or forge into the needed consutrode of electroslag smelting casting to the steel through vacuum deaeration refining; Then adopt electroslag casting process to carry out melting; The consutrode termination is melted gradually, and motlten metal pools drop, passes slag bath; Fall into crystallizer; Form metal bath, receive the water-cooled effect, solidify the formation steel ingot rapidly;
Step 2: adopt hydraulic press steel ingot to be forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out heat treatment in advance after the mechanical roughing, comprise normalizing and temper.Carry out normalized treatment earlier, with gear blank be heated to 955 ℃ the insulation 6 hours after air cooling, carry out temper then, with gear blank be heated to 690 ℃ the insulation 7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, comprise roughing, fine finishining and spark machined, then gear blank is carried out the stress-removal tempering first time, with blank heating to 630 ℃ insulation air cooling after 6 hours;
Step 5: use WEDM to carry out the line excision forming to the gear blank after the machining and process and leave certain surplus; Then carry out finish-milling and be machined to the specification requirement size through CNC milling machine; Then gear blank is carried out the stress-removal tempering second time, with blank heating to 550 ℃ insulation air cooling after 4.5 hours;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment; Be about to gear and be heated to 920 ℃ of carburizings insulations 140 hours, the air cooling of coming out of the stove after cooling to 900 ℃ with the furnace carries out tempering then; With gear be heated to 680 ℃ the insulation 7 hours after air cooling; Quench again, with gear be heated to 820 ℃ of insulations after 240 minutes quenching oil be chilled to room temperature, and in 6.5 hours through-70 ± 1 ℃ of cold treatment 4.5 hours; After the cold treatment gear is placed on and is warming up to room temperature in the hot water, be heated to 260 ℃ of tempering at last and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 for use carries out reinforced peening to gear to be handled and obtains the gear finished product, and the compressed air shotblasting machine operating current is set at 20A during reinforced peening, 20 minutes shot-peening time, coverage rate >=100%.
Metallographic structure of gear finished product and mechanical property that present embodiment obtains are seen table 7, table 8
Table: 7: embodiment 4 metallographic structures
Table 8: embodiment 4 mechanical properties
Embodiment 5
The manufacturing approach of high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: by 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, and the running gate system of going into the stove raw and auxiliary material is carried out abundant drying, cleaning with raw material; Carry out vacuum outgas through vacuum degassing refining furnace after the raw material input furnace smelting just with selection and handle, deoxidization desulfuration improves the molten steel degree of purity, casts or forge into the needed consutrode of electroslag smelting casting to the steel through vacuum deaeration refining; Then adopt electroslag casting process to carry out melting; The consutrode termination is melted gradually, and motlten metal pools drop, passes slag bath; Fall into crystallizer; Form metal bath, receive the water-cooled effect, solidify the formation steel ingot rapidly;
Step 2: adopt hydraulic press steel ingot to be forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out heat treatment in advance after the mechanical roughing, comprise normalizing and temper.Carry out normalized treatment earlier, with gear blank be heated to 960 ℃ the insulation 7 hours after air cooling, carry out temper then, with gear blank be heated to 680 ℃ the insulation 6.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining, comprise roughing, fine finishining and spark machined;
Step 5: use WEDM to carry out the line excision forming to the gear blank after the machining and process and leave certain surplus, then carry out finish-milling and be machined to the specification requirement size through CNC milling machine;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment, is about to gear and is heated to 940 ℃ of carburizings insulations 128 hours, the air cooling of coming out of the stove after cooling to 870 ℃ with the furnace; Carry out tempering then; With gear be heated to 680 ℃ the insulation 7 hours after air cooling, quench again, with gear be heated to 830 ℃ the insulation 240 minutes after quenching oil be chilled to room temperature; And in 7 hours, pass through-70 ± 1 ℃ of cold treatment 5 hours, be heated to 280 ℃ of tempering at last and come out of the stove air cooling to room temperature;
Step 7: the CrMo cast steel shot of selecting HRC42～48 for use carries out reinforced peening to gear to be handled and obtains the gear finished product, and the compressed air shotblasting machine operating current is set at 22A during reinforced peening, 30 minutes shot-peening time, coverage rate >=100%.
Metallographic structure of gear finished product and mechanical property that present embodiment obtains are seen table 9, table 10
Table 9: embodiment 5 metallographic structures
Table 10: embodiment 5 mechanical properties
Claims (6)
1. the manufacturing approach of a high-power coal cutter final stage travelling gear is characterized in that comprising the steps:
Step 1: raw material are pressed 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; Running gate system to going into the stove raw and auxiliary material is carried out abundant drying, cleaning; The raw material of selecting are carried out vacuum deaeration refining, then carry out electroslag smelting casting and obtain steel ingot;
Step 2: steel ingot is forged into gear blank, forging ratio＞3;
Step 3: gear blank is carried out carrying out Technology for Heating Processing in advance after the mechanical roughing; Said Technology for Heating Processing in advance comprises normalizing process and tempering process; Said normalizing process for gear blank be heated to 930～960 ℃ the insulation 4～7 hours after air cooling, said tempering process for gear blank be heated to 660～690 ℃ the insulation 4.5～7.5 hours after air cooling;
Step 4: heat treatment backgear blank is in advance carried out machining;
Step 5: the gear blank after the machining is carried out the processing of line excision forming and leaves certain surplus, then its finish-milling is machined to the specification requirement size;
Step 6: the gear to after the finish-milling processing carries out subsequent heat treatment; Said 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 carries out tempering then, and said tempering is for being heated to gear 650～680 ℃ of insulations air cooling after 4～7 hours; Quench again; Said quenching for gear is heated to 765～830 ℃ of insulations after 180～240 minutes quenching oil be chilled to room temperature, pass through-70 ± 1 ℃ of cold treatments 2～5 hours again, be heated to 200～280 ℃ of tempering air cooling to room temperature of coming out of the stove at last;
Step 7: gear is carried out the reinforced peening processing obtain the gear finished product.
2. the manufacturing approach of high-power coal cutter final stage travelling gear according to claim 1; It is characterized in that: before carrying out the processing of line excision forming in the said step 5; Gear blank is carried out the stress-removal tempering first time, the said stress-removal tempering first time be heated to 600～650 ℃ the insulation 4～6 hours after air cooling.
3. the manufacturing approach of high-power coal cutter final stage travelling gear according to claim 1; It is characterized in that: before carrying out subsequent heat treatment in the said step 6; Gear blank is carried out the stress-removal tempering second time, the said stress-removal tempering second time be heated to 500～550 ℃ the insulation 4～6 hours after air cooling.
4. the manufacturing approach of high-power coal cutter final stage travelling gear according to claim 1 is characterized in that: quenching oil carried out cold treatment after being chilled to room temperature in the said step 6 in 4～8 hours.
5. the manufacturing approach of high-power coal cutter final stage travelling gear according to claim 1 is characterized in that: after the cold treatment gear is placed in the said step 6 and is warming up to room temperature in the hot water.
6. the manufacturing approach of high-power coal cutter final stage travelling gear according to claim 1 is characterized in that: in the said step 7 during reinforced peening compressed air shotblasting machine operating current be set at 18～22A, 9～30 minutes shot-peening time, coverage rate >=100%.
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| CN201210365004.0A CN102837165B (en) | 2012-09-27 | 2012-09-27 | Manufacturing method for final-stage driving gear of high-power coal mining machine |
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| CN201210365004.0A Active CN102837165B (en) | 2012-09-27 | 2012-09-27 | Manufacturing method for final-stage driving gear of high-power coal mining machine |
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| CN103506817A (en) * | 2013-09-17 | 2014-01-15 | 马鞍山市益华液压机具有限公司 | Manufacturing method of steel ratchet wheel |
| CN103555904A (en) * | 2013-10-22 | 2014-02-05 | 武汉重工铸锻有限责任公司 | Thermal treatment process capable of improving low-temperature impact work of ASTM508Gr2 steel |
| CN103846632A (en) * | 2014-02-11 | 2014-06-11 | 马鞍山市恒毅机械制造有限公司 | Forging method for driving screw bevel gear forge piece of automotive rear axle |
| CN104152653A (en) * | 2014-07-29 | 2014-11-19 | 张家港市广大机械锻造有限公司 | 18CrNiWA round steel thermal treatment process |
| CN104233319A (en) * | 2014-10-10 | 2014-12-24 | 湘电集团有限公司 | Method for increasing carburizing and quenching hardness of chrome-nickel steel material |
| CN107119177A (en) * | 2017-05-16 | 2017-09-01 | 沈阳透平机械股份有限公司 | The carburizing and quenching surface intensified technique of turbocompressor 12Cr2Ni4 high gears |
| CN107299202A (en) * | 2017-05-16 | 2017-10-27 | 沈阳透平机械股份有限公司 | The conditioning treatment process choice method of carburizing and quenching gear anti-distortion |
| CN107400765A (en) * | 2017-07-07 | 2017-11-28 | 湖北鸣利来冶金机械股份有限公司 | The non-metallic inclusion high temperature passivation Technology for Heating Processing of palm of roller bits blank |
| CN107475614A (en) * | 2017-09-03 | 2017-12-15 | 安徽天裕汽车零部件制造有限公司 | A kind of automobile cage material |
| CN110283978A (en) * | 2019-07-09 | 2019-09-27 | 中国人民解放军陆军装甲兵学院 | A kind of equal materials reproducing method for wear-out failure carburized gears reparation |
| CN110885953A (en) * | 2019-12-17 | 2020-03-17 | 中铁工程装备集团有限公司 | High-strength high-toughness shield machine main driving stud material and preparation method thereof |
| CN111408914A (en) * | 2020-04-08 | 2020-07-14 | 上海振华重工集团(南通)传动机械有限公司 | Manufacturing method of lifting gear applied to pile leg of self-elevating ocean platform |
| CN112065952A (en) * | 2020-09-03 | 2020-12-11 | 西安煤矿机械有限公司 | Drum-shaped gear rail wheel for coal mining machine and preparation method thereof |
| CN114473093A (en) * | 2021-12-30 | 2022-05-13 | 苏州众泽医疗科技有限公司 | Gear machining method for motor gearbox |
| CN115338607A (en) * | 2022-08-17 | 2022-11-15 | 无锡市聚英机械制造有限公司 | Machining process of gear of coal mining machine |
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| CN103506817A (en) * | 2013-09-17 | 2014-01-15 | 马鞍山市益华液压机具有限公司 | Manufacturing method of steel ratchet wheel |
| CN103555904A (en) * | 2013-10-22 | 2014-02-05 | 武汉重工铸锻有限责任公司 | Thermal treatment process capable of improving low-temperature impact work of ASTM508Gr2 steel |
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| CN104152653A (en) * | 2014-07-29 | 2014-11-19 | 张家港市广大机械锻造有限公司 | 18CrNiWA round steel thermal treatment process |
| CN104152653B (en) * | 2014-07-29 | 2016-04-27 | 张家港市广大机械锻造有限公司 | 18CrNiWA round steel thermal treatment process |
| CN104233319A (en) * | 2014-10-10 | 2014-12-24 | 湘电集团有限公司 | Method for increasing carburizing and quenching hardness of chrome-nickel steel material |
| CN107299202B (en) * | 2017-05-16 | 2019-06-28 | 沈阳透平机械股份有限公司 | The conditioning treatment process choice method of carburizing and quenching gear anti-distortion |
| CN107119177A (en) * | 2017-05-16 | 2017-09-01 | 沈阳透平机械股份有限公司 | The carburizing and quenching surface intensified technique of turbocompressor 12Cr2Ni4 high gears |
| CN107299202A (en) * | 2017-05-16 | 2017-10-27 | 沈阳透平机械股份有限公司 | The conditioning treatment process choice method of carburizing and quenching gear anti-distortion |
| CN107119177B (en) * | 2017-05-16 | 2019-07-12 | 沈阳透平机械股份有限公司 | The carburizing and quenching surface intensified technique of turbocompressor 12Cr2Ni4 high gear |
| CN107400765A (en) * | 2017-07-07 | 2017-11-28 | 湖北鸣利来冶金机械股份有限公司 | The non-metallic inclusion high temperature passivation Technology for Heating Processing of palm of roller bits blank |
| CN107475614A (en) * | 2017-09-03 | 2017-12-15 | 安徽天裕汽车零部件制造有限公司 | A kind of automobile cage material |
| CN110283978A (en) * | 2019-07-09 | 2019-09-27 | 中国人民解放军陆军装甲兵学院 | A kind of equal materials reproducing method for wear-out failure carburized gears reparation |
| CN110885953A (en) * | 2019-12-17 | 2020-03-17 | 中铁工程装备集团有限公司 | High-strength high-toughness shield machine main driving stud material and preparation method thereof |
| CN111408914A (en) * | 2020-04-08 | 2020-07-14 | 上海振华重工集团(南通)传动机械有限公司 | Manufacturing method of lifting gear applied to pile leg of self-elevating ocean platform |
| CN112065952A (en) * | 2020-09-03 | 2020-12-11 | 西安煤矿机械有限公司 | Drum-shaped gear rail wheel for coal mining machine and preparation method thereof |
| CN114473093A (en) * | 2021-12-30 | 2022-05-13 | 苏州众泽医疗科技有限公司 | Gear machining method for motor gearbox |
| CN115338607A (en) * | 2022-08-17 | 2022-11-15 | 无锡市聚英机械制造有限公司 | Machining process of gear of coal mining machine |
| CN115338607B (en) * | 2022-08-17 | 2023-12-12 | 无锡市聚英机械制造有限公司 | Processing technology of gear of coal mining machine |
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