CN107160102B - A kind of coal face scraper conveyor intermediate channel manufacture craft - Google Patents
A kind of coal face scraper conveyor intermediate channel manufacture craft Download PDFInfo
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- CN107160102B CN107160102B CN201710345994.4A CN201710345994A CN107160102B CN 107160102 B CN107160102 B CN 107160102B CN 201710345994 A CN201710345994 A CN 201710345994A CN 107160102 B CN107160102 B CN 107160102B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000003245 coal Substances 0.000 title claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 238000005266 casting Methods 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 238000007493 shaping process Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000005496 tempering Methods 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract 1
- 238000005476 soldering Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 239000002893 slag Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 9
- 229910052748 manganese Inorganic materials 0.000 description 9
- 239000011572 manganese Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910000323 aluminium silicate Inorganic materials 0.000 description 3
- 229910052729 chemical element Inorganic materials 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 208000012788 shakes Diseases 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 241001504664 Crossocheilus latius Species 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 239000000470 constituent Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of coal face scraper conveyor intermediate channel manufacture craft, technical solution includes casting step, heat treatment step, welding step.Molten steel tapping temperature is 1620-1640 DEG C in casting step, and calm 5-10 minutes holding temperature is 1560-1580 DEG C of casting.870-890 DEG C of heat preservation progress normalizing in 4-6 hours is heated in heat treatment step；570-600 DEG C of tempering is again heated to after cooling.Welding step first preheats in advance in not less than 10 DEG C indoor progress, heats each 30mm wide in soldering opening two sides, middle plate is preheated to 150-200 degree, and ledge is preheated to 200-250 degree.Carry out disappearing after welding welding stress annealing: the intermediate channel after welding is heated to 500-550 DEG C (80-120 DEG C/h), and is kept for 2 hours, be then furnace-cooled to 150-200 DEG C come out of the stove it is air-cooled.The present invention can effectively improve the wear-resisting mechanical performance of the middle pan of scraper conveyor, and obtain the higher drag conveyor of structure size precision.
Description
Technical field
Present invention relates particularly to a kind of coal face scraper conveyor intermediate channel manufacture crafts, belong to material processing processing
Field.
Background technique
Comprehensive mechanical coal mining has been popularized, and drag conveyor is Development of Continuous Transport System tool, is that coal mine usage amount is maximum, is consumed most
More important equipments.Drag conveyor is made of head tail portion, intermediate channel and its appurtenances.Wherein, intermediate channel is that scraper plate is defeated
The important component for sending the bearer connection body of machine is the critical component of complete equipment, and positioned at the middle part of scrapper conveyor, it is both to scrape
The running track of plate chain, and be the walking track of coalcutter, still carry the operation channel of coal stream.It is simultaneously also to be used on scrapper conveyor
The component that amount is maximum, quality is most heavy, a general drag conveyor contain 100 more piece intermediate channels, and every section flute length is 1.2 meters or 1.5
Rice.Intermediate channel is whole cast welding sealing bottom type structure, and intermediate channel is mainly by baffle, shovel board ledge and middle plate, bottom plate welding group
At middle plate, bottom plate material are NM400, and baffle, shovel board ledge material are ZG30MnSi.Upper slot is used as Coal Transport, lower slot
It is used for scraper plate return.
The intermediate channel that the whole nation is failed by abrasion every year reaches hundreds of thousands of sections.
The reason for this is that: the 1. operation and the abrasion of middle plate, ledge of scraper plate, chain, coal stream, while in use, if meeting big
In the stuck slot of lump coal rock, middle plate compression can also generate buckling deformation；2. coalcutter is moved along intermediate channel ledge, ledge is caused
Upper wear, while the impact of additional load and roller cutting coal seam, also will cause ledge deformation；3. coalcutter advances to coal
Wall direction is mobile to generate horizontal direction bending, while pushing and pulling hydraulic support stress keeps plate generation arch in intermediate channel curved, in addition bottom plate
It is laid with injustice and generates bending up and down, and then connector tension bends song, has aggravated the abrasion of middle plate, ledge edge.
As it can be seen that intermediate channel applying working condition is more severe, stress is complicated and changeable, therefore it is required that intermediate channel have enough intensity, just
Degree and wearability.In order to meet intensity requirement, big margin design is often used in reality, be easy to cause the wasting of resources.And product
Quality be mainly reflected in mechanical property, so intermediate channel ledge should have good mechanical property.According to rough Statistics, China
The casting ledge weight that major Mei Ji factory produces every year is in 30Wt or more, and therefore, urgent need develops a set of better manufacturing process,
To improve drag conveyor capability and performance.
Product current technology:
The ledge shape and structure of intermediate channel is complicated, and volume is larger, and machining is all relatively difficult, therefore straight using raw material
Connect casting and forming.Steel-casting is easy to produce more serious dendritic segregation, organizes after solidification extremely unevenly, especially alloy cast steel part
It is particularly evident.During solidification of molten steel, austenite grows up to different grain shapes along section thickness direction.Casting section is got over
Thickness, i.e., when cooling slower, column crystal and thick equiax crystal more reach.Column crystal and thick equiax crystal can be such that the mechanical property of steel reduces,
Especially toughness.Ledge wall unevenness is even, and often there is different institutional frameworks at each position of same casting, and remains quite big
Internal stress, thus its mechanical performance is poor.It is not very much, to be to the research of ZG30MnSi ledge in this respect in the same industry
The performance quality for improving ZG30MnSi chute steel, needs to carry out the linguistic term of this respect, so that material composition and heat treatment
Influence to ZG30MnSi ledge steel quality is reduced to minimum, and mechanical property reaches best.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provides a kind of available quality more preferably scraper plate conveying
The technology of machine.
To achieve the above object, the technical solution used in the present invention is as follows:
The present invention provides a kind of coal face scraper conveyor intermediate channel manufacture craft, including casting step, heat treatment
Step, welding step.
The wherein casting step are as follows:
(1) selects 100 parts of 70 sand, and 7-8 parts of waterglass are fabricated to intermediate channel ledge mold, and keep intermediate channel mold aqueous
Amount is 5-6%, and wet pressing power is greater than 0.008MPa, and penetrable ventilated to be greater than 200ml, dry strength is greater than 0.3MPa.
(2) makes 1620-1640 DEG C of molten steel tapping temperature, carries out calmness 5-10 minutes in steel ladle after tapping.
(3) starts to enter pouring molten steel into intermediate channel mold, and so that molten steel is kept temperature 1560- in casting process
1580 DEG C, starts to control small flow casting when casting, be then poured flow by increasing；It tears open within natural cooling 8 hours after casting complete
Mould, the intermediate channel ledge hair for obtaining moulding by casting are big；Intermediate channel ledge hair is big after machining, obtain shaping structures
Intermediate channel ledge.
The wherein heat treatment step are as follows:
(1) normalizing: the intermediate channel ledge of the shaping structures is placed in heat medium, by 100-120 DEG C/h
Speed carried out being heated to 630-680 DEG C, and at this temperature range inside holding 1.5-2 hours；It is carried out again by 50 DEG C/h of speed
It is heated to 870-890 DEG C, and at this temperature range inside holding 4-6 hours；
(2) is cooling: stopping heating, naturally cools to≤400 DEG C, and at this temperature range inside holding 5-7 hours；
(3) is tempered: the molding intermediate channel ledge of heating structure again, and heating speed is carried out by 100-120 DEG C/h, and
It is heated to 570-600 DEG C, and at this temperature range inside holding 5-6 hours；
It finally cools down: stopping heating, be cooled in furnace less than 300 DEG C, then cooled to room temperature；
Wherein the welding step is that middle plate, bottom plate are welded on the intermediate channel ledge of shaping structures, and process is such as
Under:
(1) is welded in interior of the room temperature not less than 10 DEG C；
(2) preheats weld part in advance, and makes heat input 14-17KJ/cm, is uniformly added using cutting torch neutral flame
Each 30mm wide in hot weld interface two sides, middle plate are preheated to 150-200 DEG C, and ledge is preheated to 200-250 DEG C, then starts to weld；
(3) after welding, intermediate channel is obtained, intermediate channel is subjected to the welding stress annealing that disappears: intermediate channel is heated to 500-
550 DEG C, and kept for 5 hours, then natural cooling.
A kind of coal face scraper conveyor intermediate channel ledge manufacture craft as described above, specifically: the casting
It makes in step, when pour steel is raised to mold riser, casting 5 minutes should be stopped, being then poured rapidly again and pour full riser.
A kind of coal face scraper conveyor intermediate channel ledge manufacture craft as described above, specifically: molten steel tapping
Temperature is 1630 DEG C, is carried out in steel ladle after tapping 7 minutes calm；Molten steel is set to be kept for 1570 DEG C of temperature in casting process.
A kind of coal face scraper conveyor intermediate channel manufacture craft as described above, specifically: the welding step
It is rapid specific as follows: first to stand up the intermediate channel ledge of shaping structures in two sides, middle plate is assembled in the intermediate channel of the shaping structures
The waist of ledge, bottom plate are assembled in the bottom of the intermediate channel ledge of the shaping structures；When it is assembled, the width of rebate of formation increases
Add deformation-compensated amount △ B, specifically: upper notch compensation rate △ B is 3-4mm, and lower notch compensation rate △ B is 4-5mm, and upper notch
Compensation rate △ B is less than lower notch compensation rate △ B2-3mm.
A kind of coal face scraper conveyor intermediate channel manufacture craft as described above, specifically: the heat treatment
Step are as follows: (1) is heated: the molding intermediate channel of structure welding is carried out being heated to 500-550 DEG C by 110 DEG C/h of speed；
(2) Stress relieving annealing: it is furnace-cooled to 150-200 DEG C of cooled to room temperature.
A kind of coal face scraper conveyor intermediate channel manufacture craft as described above, specifically: by middle part after welding
Slot carries out Stress relieving annealing: intermediate channel being heated to 500-550 DEG C and is annealed.
The invention has the benefit that
The distinctive mechanical structure feature of technology combination drag conveyor of the invention and use environment, make about scraper plate
The manufacturing process of conveyer can effectively improve the wear-resisting mechanical performance of the middle pan of scraper conveyor, and obtain structure size essence
Spend higher drag conveyor.
Detailed description of the invention
Fig. 1 is the intermediate channel section structure diagram of drag conveyor.
Wherein: 1- ledge；Plate in 2-；3- bottom plate；4- sealing run.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.
With reference to attached drawing 1, intermediate channel is welded to form by ledge 1, middle plate 2, bottom plate 3, and middle plate 2,3 material of bottom plate are NM400, slot
Side 1, shovel side material are ZG30MnSi, main 30~70mm of wall thickness, and there are thick big position in both ends and intermediate part.
Low-alloy cast steel of the ZG30MnSi chute steel based on carbon, manganese, the big element of silicon three, except there is also upper described to lack for this
Measure impurity element.Carbon is the basic element for determining steel performance, is to obtain one of high-intensitive, effective intensified element of high rigidity,
The mechanical strength and hardness of steel will change with the variation of phosphorus content.Manganese is the weaker element for forming carbide, can be solid-solution in
Ferrite, thus reinforced ferrite.Manganese can enhance the stability of austenite, reduce quenching critical cooling rate, improve quenching for steel
Permeability.But manganese plays the role of that crystal grain is promoted to grow up, more sensitive to the overheat of steel, the higher steel tempering brittleness containing manganese is more apparent.
Silicon can be solid-solution in ferrite, and have stronger solution strengthening effect, while it has inhibition to tempering transition.When silicomanganese element
The proportion of addition can reduce the overheat tendency of manganese steel where appropriate, decarburization disadvantage caused by can reducing because of silicon.Aluminium is as deoxidation
Agent is added, and aluminium can refine the crystal grain of steel, inhibits the timeliness of mild steel, improves the toughness of steel at low temperature, inoxidizability, wear-resisting
Property and fatigue strength.Since low-alloy cast steel is relatively high to raw material requirement, impurity element sulphur, phosphorus are often considered to be harmful member
Element, content must be strictly controlled.For the requirement of intermediate channel chute steel service performance, the applicant changes the current ZG30MnSi of inspection repeatedly
Ledge steel sample, gained chemical composition content such as following table.
In chute steel actual production process, when corresponding sample is tested, it may appear that chemical component proportion suitably conforms to
It asks, larger situation but occurs differing in mechanical performance after being similarly heat-treated.A drag conveyor needs in more piece simultaneously
, such as there is above situation in portion's slot, will lead to the different intermediate channel service performance of same scrapper conveyor and differs larger, influences whole and scrape
The service performance of trigger.So chemically the relationship of ingredient and mechanical performance must adjust chemical component proportion relation, due to
It is difficult to control the variation of wherein a certain element in actual production to realize the control to required performance.Therefore, various members are found
Element plays the comprehensive function of various elements to the affecting laws of mechanical property, the various chemical element contents of optimum proportioning, can either
So that material obtains preferable mechanical property, and it is easy to implement in actual production.It must select reasonably to be heat-treated work simultaneously
Skill improves the mechanical property and service performance of chute steel to greatest extent.
According to above-mentioned condition, the following production process of this example design.
One, casting step:
The real modeling of use.Foudry line contracting interest rate is selected as 2.0% by waterglass limestone sand, the reserved processing of machined surface
Surplus is 5mm, and to reduce casting weight, pattern draft machined surface uses increase and decrease wall thickness using reduction casting section thickness, non-processing face
Mode, pattern draft be α/mm≤2.0mm.In lower loam core to guarantee that loam core is non-rising, stud need to be used to carry out loam core
It is fixed.Casting uses bottom pouring type pouring.
Two kinds of materials of quartz sand and 70 sand, CO2 hardening have been selected in trial-production.Facing sand can be used in batch production process
Quartz sand, floor sand use 70 sand.
Mulling is carried out using simpson mill.Because the resistance to stone roller property of limestone sand is poor, it is desirable that the muller of sand mixer and chassis
Distance is 20-25mm, and scraper plate and chassis distance are 5-10mm.It first dry-mixed 2-4 minutes, adds water glass and carries out mixed grind.Molding sand
It see the table below with when performance:
Twice of zirconium English bauxite composite coating of mould surface flow coat.Because limestone sand generates decomposition at high temperature, generate big
The gas of amount, when moulding, will carry out exhaust on sand mold, improve sand mold exhaust capacity.
According to material requirements, the control of chemical element, especially P, S, Al content must be strictly controlled in smelting process.It adopts
It is poured with shaking ladle, and band is spot-check with furnace sample to carry out mechanical test and chemical element.
To make casting obtain good feeding, the control of molten steel tapping temperature is after 1620-1640 DEG C, tapping in steel ladle
Calm to molten steel is carried out, so as to be suspended in the inclusion floating in molten steel, the calm time should be greater than 5min according to tapping temperature, no
More than 10min.The defects of pouring temperature is controlled at 1560-1580 DEG C, and cast cold can reduce casting shrinkage cavity and porosity is inclined
To.Control poring rate when casting, molten steel flow is controlled smaller by when beginning, avoids molten steel from washing away sand mold, then
It is gradually increased.When molten steel rises to riser, beam should be delayed, then increase beam and continue to be poured, until pouring full riser.It is anti-
Only the clinker in molten steel enters sand mold type chamber.Entire casting process does not allow molten steel to stop, and casting is avoided to generate cold shut defect.It pours
Add thermal-insulating covering agent after note on casting pressing port, improves riser feeding effect.Shake out time control is being not less than 8 hours, prevents
The too early shake out of casting is deformed.
During producing ledge part, often occur occurring the glassy Slag inclusion of local celadon at the top of ledge.This folder
Slag object is floated from molten steel, and since top does not set riser, Slag inclusion can not be discharged, and is just detained and is formed dreg defect.
The main constituent of Slag inclusion is manganese aluminosilicate, and CaO content is very low, and Slag inclusion is not directly from reduced blast furnace,
Because reduced blast furnace has very high calcium oxide content, general tall and big 30%-50%.Contain very high MnO in Slag inclusion, so with
Molten steel is related, because containing a large amount of manganese elements in molten steel.SiO in MnO and reducing slag in molten steel2、Al2O3Deng acid or weak acid
Property oxide reaction product.Due to molten steel in casting ladle calm limited time, be involved in manganese aluminosilicate slag inclusion in molten steel without
Method floats completely, and part slag liquid enters type chamber with molten steel in casting process, floats at the top of casting mold, forms cast(ing) surface slag inclusion
Object.Rear manganese addition iron is formed by reinforcing reduction initial stage and the preceding molten steel precipitation desoxydation of tapping, thin slag, it is possible to reduce MnO in molten steel
Content and elimination casting manganese aluminosilicate Slag inclusion, eliminate this defect.
Two, heat treatment process:
The covert point of cast steel is the important evidence for formulating heat treatment process, since ZG30MnSi ledge carbon content of steel is higher,
And it is complex-shaped, normalizing+tempering heat treatment process is used to it.
Various processes in the heating temperature of steel, soaking time and the entire heat treatment process of the type of cooling are joint effect heat
Processing result.In complicated heat treatment process, a little the variation of a certain procedure all influences ZG30MnSi chute steel and obtains
Different mechanical properties.It therefore, is many-sided common work to the Effect on Mechanical Properties of steel for chemical Composition Control and heat treatment
As a result, every one of technique must be paid much attention in production process, to obtain more good ZG30MnSi chute steel.
The heat treatment step are as follows:
(1) normalizing: the intermediate channel ledge of shaping structures is placed in heat medium, by 100-120 DEG C/h of speed
It carries out being heated to 630-680 DEG C, and at this temperature range inside holding 1.5-2 hours；It is heated again by 50 DEG C/h of speed
To 870-890 DEG C, and at this temperature range inside holding 4-6 hours；
(2) is cooling: stopping heating, naturally cools to 400 DEG C, and at this temperature range inside holding 5-7 hours；
(3) is tempered: the molding intermediate channel ledge of heating structure again, and heating speed is carried out by 100-120 DEG C/h, and
It is heated to 570-600 DEG C, and at this temperature range inside holding 5-6 hours；
It finally cools down: stopping heating, be cooled in furnace less than 300 DEG C, then cooled to room temperature；
Three, welding step is as follows:
ZG30MnSi and NM400 is the welding of different alloys steel, and choosing welding wire should be suitable with welding material intensity, and uses two
Carbon dioxide gas mixture protection weldering, can be selected 55kg grades of high-strength welding wire.
Working environment: room temperature is not less than 10 DEG C.Weld preheating uses local preheating, heat input 14-17KJ/cm.
Each 30mm wide in groove two sides is evenly heated using cutting torch neutral flame, preheating temperature is 150-200 DEG C at wearing plate, slot
Preheating temperature is 200-250 DEG C at side, and temperature needs strict control at ledge, needs to carry out continuous uninterrupted welding in welding process.
Welding current:
| Gage of wire | Backing welding | Filling weldering | Cosmetic welding | Remarks |
| 1.2 welding wire of φ | 230-240A | 280A or so | No more than 320A | |
| 1.6 welding wire of φ | 280-300A | 350A or so | No more than 380A |
Arc voltage: when I<300A, when U=26-28V, I>300A, U=32-34V
Stem elongation degree (distance of workpiece to ignition tip):
| Gage of wire | I>300A | I<300A | Remarks |
| 1.2 welding wire of φ | 12-16mm | No more than 20 | |
| 1.6 welding wire of φ | 14-18mm | No more than 20 |
Gas flow: when I < 300A, 15-20L/min is taken；When I > 300A, 15-20L/min is taken
Welding step:
From intermediate Xiang Yitou backstep welding, then from the other end to intermediate backstep welding, when welding, must not stitch in welding wire alignment and swings,
And welding wire angle divides equally groove total angle.Previous welding bead plays pre- heat effect to latter welding bead, and latter welding bead is to previous
Welding bead plays thermal processes act, can improve the tissue and performance at welding point.There is defect to reprocess in time.To prevent cold crack
The starting the arc cannot the starting the arc on base material.
Welding sequence: positive first of weld seam is first welded in the welding of a, middle plate 2, b, welds sealing run 4, weld seam Ying Yuzhong plate again
2,1 rounding off of intermediate channel ledge of shaping structures.C, front is welded using two layers three, and one of first layer, second layer twice,
First plate side in welding, weld seam will be put down, and prevent 1 side of intermediate channel ledge of shaping structures lack of penetration.It is used if weld seam tooled joint is bad
Three layer of four welding, the 4th weld cap.
The intermediate channel ledge 1 of shaping structures and middle plate 2, bottom plate 3 welding process in, effectivelying prevent welding deformation amount is to protect
One of an important factor for demonstrate,proving welding quality.Middle plate uses two-sided double V-groove, ledge take connect with middle plate fly at weldering it is flat, reach with
The middle reliable effective position welding of plate.
Since the post welding distortion of intermediate channel shows as slot opening contraction distortion, so slot opening B is determined as B+ in assembling
△ B added the deformation-compensated amount contrary with welding deformation in advance；Again because intermediate channel welding after there are also ledge relatively in
The deflection distortion of plate, it is lower more less in the contraction distortion amount of ledge, so above and below on the deformation-compensated amount △ B of slot opening, under △ B
Also different, on △ B < △ B under, that is, notch size is trapezoidal up and down when assembling, determine deformation-compensated amount be on △ B=3mm~
Under 4mm, △ B=4mm~5mm, and than big 2mm~3mm on △ B suitable for reading under lower mouth △ B.
Since each part of middle part bowl assembly is there are size and uneven deformation, the welding process presence of different welders is poor
Different, these all can make the welding deformation of intermediate channel unstable, so added rigid fixation again on the basis of prestrain method.
Technological measure is: notch position is respectively welded with 40 round steel of φ and draws strong (postwelding removal) above and below intermediate channel both ends, using pressure
Means limit and reduce post welding distortion.
Post weld heat treatment control: after ledge and middle plate, bottom plate welding, in order to eliminate welding residual stress, prevent delay from splitting
The generation of the welding defects such as line reduces welding deformation amount, guarantees the product entirety accuracy of manufacture, should be immediately after the completion of intermediate channel welding
Stress relief annealing process is carried out, Stress relieving annealing temperature is 500-550 DEG C, and constant temperature keeps 2-3h.
Above embodiment is used to illustrate the present invention, rather than limits the invention, in spirit of the invention
In scope of protection of the claims, to any modifications and changes that the present invention makes, protection scope of the present invention is both fallen within.
Claims (5)
1. a kind of coal face scraper conveyor intermediate channel manufacture craft, including casting step, heat treatment step, welding step
Suddenly；It is characterized by:
The casting step are as follows:
(1) selects 100 parts of 70 sand, and 7-8 parts of waterglass are fabricated to intermediate channel mold, and make intermediate channel mold water content 5-
6%, wet pressing power is greater than 0.008MPa, and penetrable ventilated to be greater than 200ml, dry strength is greater than 0.3MPa；
(2) makes 1620-1640 DEG C of molten steel tapping temperature, carries out calmness 5-10 minutes in steel ladle after tapping；
(3) starts to enter pouring molten steel into intermediate channel mold, and so that molten steel is kept for 1560-1580 DEG C of temperature in casting process,
Start to control small flow casting when casting, is then gradually increased casting flow；Natural cooling demoulding in 8 hours, is obtained after casting complete
Obtain the intermediate channel ledge blank of moulding by casting；By intermediate channel ledge blank after machining, the middle part of shaping structures is obtained
Slot ledge；
The heat treatment step are as follows:
(1) normalizing: the intermediate channel ledge of the shaping structures is placed in heat medium, by 100-120 DEG C/h of speed
It carries out being heated to 630-680 DEG C, and at this temperature range inside holding 1.5-2 hours；It is heated again by 50 DEG C/h of speed
To 870-890 DEG C, and at this temperature range inside holding 4-6 hours；
(2) is cooling: stopping heating, naturally cools to≤400 DEG C, and at this temperature range inside holding 5-7 hours；
(3) is tempered: the molding intermediate channel ledge of heating structure again, and heating speed is heated by 100-120 DEG C/h of progress
To 570-600 DEG C, and at this temperature range inside holding 5-6 hours；
It finally cools down: stopping heating, be cooled in furnace less than 300 DEG C, then cooled to room temperature；
The welding step is that middle plate, bottom plate are welded on the intermediate channel ledge of shaping structures, and process is as follows:
(1) is welded in interior of the room temperature not less than 10 DEG C；
(2) preheats weld part in advance, and makes heat input 14-17KJ/cm, is evenly heated weldering using cutting torch neutral flame
Each 30mm wide in interface two sides, middle plate are preheated to 150-200 DEG C, and ledge is preheated to 200-250 DEG C, then starts to weld；
(3) after welding, intermediate channel is obtained, intermediate channel is subjected to the welding stress annealing that disappears: intermediate channel is heated to 500-550 DEG C,
And kept for 2 hours, it is furnace-cooled to 150-200 DEG C of then natural cooling.
2. a kind of coal face scraper conveyor intermediate channel manufacture craft as described in claim 1, which is characterized in that described
Casting step in, when pour steel rises full mold riser, casting 5 minutes should be stopped, then riser is expired in rapid teeming again.
3. a kind of coal face scraper conveyor intermediate channel manufacture craft as described in claim 1, which is characterized in that molten steel
Tapping temperature is 1630 DEG C, is carried out in steel ladle after tapping 7 minutes calm；Molten steel is set to keep temperature 1570 in casting process
℃。
4. a kind of coal face scraper conveyor intermediate channel manufacture craft as described in claim 1, which is characterized in that described
Welding step it is specific as follows: first the intermediate channel ledge of shaping structures is stood up in two sides, middle plate is assembled in the shaping structures
Intermediate channel ledge waist, bottom plate is assembled in the bottom of the intermediate channel ledge of the shaping structures；When it is assembled, the slot of formation
Mouth width degree increases deformation-compensated amount △ B, specifically: upper notch compensation rate △ B is 3-4mm, and lower notch compensation rate △ B is 4-5mm,
And upper notch compensation rate △ B is less than lower notch compensation rate △ B2mm.
5. a kind of coal face scraper conveyor intermediate channel manufacture craft as described in claim 1, which is characterized in that described
Heat treatment step are as follows:
(1) normalizing: the intermediate channel ledge of shaping structures is placed in heat medium, is carried out by 100-120 DEG C/h of speed
It is heated to 630-680 DEG C, and at this temperature range inside holding 1.5-2 hours；It is heated to again by 50 DEG C/h of speed
870-890 DEG C, and at this temperature range inside holding 4-6 hours；
(2) is cooling: stopping heating, naturally cools to≤400 DEG C, and at this temperature range inside holding 5-7 hours；
(3) is tempered: the molding intermediate channel ledge of heating structure is heated to 582 DEG C again.
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| CN100503867C (en) * | 2007-02-01 | 2009-06-24 | 南阳二机石油装备(集团)有限公司 | Petroleum drilling machine winch brake hub material and preparation method thereof |
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