CN102399960A - Cracking-resistant treatment method for grid plate of ball mill - Google Patents
Cracking-resistant treatment method for grid plate of ball mill Download PDFInfo
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- CN102399960A CN102399960A CN2011103434846A CN201110343484A CN102399960A CN 102399960 A CN102399960 A CN 102399960A CN 2011103434846 A CN2011103434846 A CN 2011103434846A CN 201110343484 A CN201110343484 A CN 201110343484A CN 102399960 A CN102399960 A CN 102399960A
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- 238000005336 cracking Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 10
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910000617 Mangalloy Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 238000010114 lost-foam casting Methods 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 13
- 230000035882 stress Effects 0.000 claims description 8
- 230000003245 working effect Effects 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract 1
- 238000005485 electric heating Methods 0.000 abstract 1
- 230000002431 foraging effect Effects 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000012256 powdered iron Substances 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
A method for preventing cracking of a ball mill grid plate aims to have better toughness, wear resistance and crack resistance; the grid plate adopts a high manganese steel material ZGMn18Cr2MoVReSi containing Cr and Mo metal elements; is made by lost foam casting; placing the cast grid plate into an electric heating furnace for heating and heat preservation treatment so as to obtain higher strength and toughness; taking the grid plate out of the furnace, and putting the grid plate into water with the temperature of 25-35 ℃ for water toughening treatment to obtain a single austenite structure; taking the grid plate out of the water, putting the grid plate into a tempering furnace, heating the grid plate to 250-300 ℃, and then cooling the grid plate; placing the grid plate in the open air for aging treatment; the aging treatment time is 12-18 months.
Description
Technical field
The present invention relates to the anti-rimose treatment technology of a kind of ball mill grillflooring.
Background technology
Ball mill is the major equipment that powdered iron ore is produced, and grate discharge ball mill mainly comprises feeder, barrel, discharging portion, in order to reduce the wearing and tearing of powdered iron ore to the ball mill body, at the ball mill discharging portion grillflooring is installed and is protected end cover of ball mill.What the grillflooring material was selected for use usually is common manganese steel plate, after its casting is accomplished, need carry out the tough processing of water, to obtain purer austenite structure.If manganese content is higher in the grillflooring, easy brittle failure of grillflooring or cracking, if manganese content is on the low side in the grillflooring, grillflooring is not wear-resisting again.Therefore use producing, grillflooring easy deformation and brittle failure, particularly grillflooring cracking back, that ball mill is told ball is frequent, has a strong impact on the grinding operation rate and the efficient of ball mill, strengthens and divides stage load, brings great difficulty for equipment control and organization of production.
Summary of the invention
The present invention seeks to overcome the deficiency of above-mentioned prior art, a kind of anti-cracking of ball mill grillflooring treatment process with better toughness, wear resistance and rupture strength is provided.
The inventive method is:
(1) grillflooring adopts the high manganese steel material ZGMn18Cr2MoVReSi that contains Cr, Mo metallic element, processes through lost foam casting.
(2) will cast good grillflooring need put into electrical heater and carry out heat tracing and handle; Be heated to 150 ℃～250 ℃ earlier, be incubated 1～2 hour, be 30 ℃～40 ℃/hour by speed then and be warmed up to 600 ℃～630 ℃, be incubated 4.0～4.5 hours; Continue to be warmed up to 1000 ℃～1050 ℃ by 50 ℃～60 ℃/speed at one hour rating again; Be incubated 2.5～3.0 hours; Through handling like this, the grillflooring carbide is dissolved in the austenite fully, to obtain higher strength and toughness.
(3) grillflooring is taken out from stove, the water of putting into temperature and be 25 ℃～35 ℃ carries out the tough processing of water, 2.0～2.5 hours tough treatment times of water.Purpose is the carbide of eliminating in the as-cast structure, obtains single austenite structure.Because carbide reduces the intensity of grillflooring and makes the grillflooring embrittlement in the grillflooring, make grillflooring produce casting crack easily.
(4) grillflooring is taken out from water, the grillflooring temperature is lower than below 120 ℃, puts into tempering stove, is 30 ℃～40 ℃/hour by speed and is heated to 250 ℃～300 ℃, is incubated 5～7 hours, cools off with 1.0～2.0min/mm speed then; Intensity and hardness constantly descend in drawing process, and plasticity and toughness improve gradually.In the grillflooring drawing process, produce stress concentration and crackle; The outside burr of grillflooring, slag inclusion, sand grains must be cleaned out in advance, and its physical dimension must cut away the casting and pouring rising head according to drawing physical dimension with oxygen-acetylene rifle gas cutting and redundance such as the mould that rises in advance.
(5) grillflooring is placed on carries out ageing treatment in the open; The ageing treatment time is 12～18 months, carries out natural aging treatment through natural condition such as Exposure to Sunlight rainforests, eliminates the internal stress of casting with this, prolongs the work-ing life of grillflooring.
Use and the abrading section according to grillflooring, add the circular arc cracking strip, add radially cracking strip at the grillflooring radial direction at the grillflooring circumferential direction; The major part of grillflooring is provided with the trapezoidal installation wedge head of being convenient to install in the outer ring; Grillflooring ore removal hole is a slotted hole; Section is trapezoidal; Ore removal hole longitudinal axis and ball mill radial direction angle are R=40 °～50 °, and the ore removal pitch of holes is 46-50mm, trapezoidal shape size upper base/go to the bottom * height * length=(18～22)/(32～36) * (100～130) * (150～200); Trapezoidal direction and ore removal are in the opposite direction, prevent that grillflooring from blocking up the ore deposit.
On the grillflooring basis of high mangaenese steel composition, add Cr, Mo and other element and make it the formed chromatize grillflooring of microalloying ZGMn18Cr2MoVReSi; Under carbide dissolves completely condition; Grillflooring ZGMn13 before intensity and toughness all are superior to; Especially yield strength is more obvious, is to prevent grillflooring rimose major technique.Suitable tempering temperature and soaking time can be eliminated casting stress and obtain the precipitation strength effect, prevent that casting crack from taking place.Contain element daughter boards such as Metal Cr, Mo after casting; Should be through the ageing treatment of certain hour; Eliminate casting stress through low temperature or normal temperature, insulation for a long time or heating, can progressively improve the plasticity and the toughness of grillflooring, eliminate the internal stress of casting; Prolong its work-ing life, prevent the grillflooring cracking.
The present invention is suitable for the grillflooring transformation to existing grate discharge ball mill.In grillflooring casting, add the effect that carbide is separated out in the grillflooring of slowing down of elements such as rare metal Cr, Mo and V, can guarantee the toughness that it is good, improve its machinery and physicals, have higher wear resistance and rupture strength.It is low to have overcome former grillflooring body intensity, and thickness is not enough, and characteristics such as easy to crack and yield deformation can reach more than two times of common grillflooring work-ing life work-ing life.Arch change or cracking can not take place in the grillflooring that contains rare elements of effective processing.Reduce the downtime, improve the ball mill operating rate.
Description of drawings
Fig. 1 is a ball mill grillflooring structural representation of the present invention.
Fig. 2 is the sectional view of A-A line in Fig. 1.
Among the figure: 1, trapezoidal installation wedge head, 2, the circular arc cracking strip, 3, the ore removal hole, 4, cracking strip radially, 5, middle flush bolt hole.
Embodiment
When grillflooring is installed on ball mill; With (48 of M42～M48) * (480～760) immerse oneself in standing bolt, grillflooring is fixed on the end cover of ball mill, simultaneously with the slit between the grillflooring with 16Mn steel plate plug jail; And to select diameter for use be the 16Mn steel plate welding rod special for special J502 solid welding of Φ 3～Φ 4; Anti-ball mill grillflooring displacement in service is cut off the grillflooring joint bolt or is damaged grillflooring, makes the grillflooring cracking.According to the gap size between the grillflooring, the Mn16 steel plate adopts processed.
Add circular arc cracking strip 2 at the grillflooring circumferential direction, add radially cracking strip 4, prevent that grillflooring fracture and protection grillflooring standing bolt from avoiding ore pulp and washing away, wear and tear at the grillflooring radial direction.The major part of grillflooring is provided with trapezoidal installation wedge head 1 in the outer ring, is convenient to the outer ring grillflooring and installs.Grillflooring ore removal hole 3 is a slotted hole, and section is trapezoidal, and trapezoidal direction is opposite with ore removal direction Q, blocks up the ore deposit to prevent grillflooring.
The thickness of ball mill centre portions inner ring grillflooring becomes 110～130mm after increasing by 35 millimeters; And increase the two muscle of anticracking in addition; Circumferential section outer ring grillflooring thickness becomes 100～120mm after increasing by 25 millimeters, and other increases the two muscle of anticracking, so grillflooring thickness is increased to 100～120 millimeters of thickness by 80 millimeters of original thickness; Tough processing of proper extension water and ageing treatment time, make austenite structure optimization.Purpose prolongs grillflooring work-ing life, and grillflooring and ball mill barrel liner plate are changed synchronously, reduces ball mill stopping production number of times and off-time, raising ore grinding time and efficient.
Because the poor thermal conductivity of grillflooring, thermal expansivity is big, is easy to generate thermal stresses and structural stress, therefore, for simple shape, thickness evenly, the grillflooring do not piled up of shove charge, directly with middle and high intensification quenching; Research shows that longer in the above soaking time of AC1, the fragility phased soln the more; Can not only reduce the generation of casting crack, and can reduce the fragility phase, reduce inside and outside, the table in the temperature difference; Reduce thermal stresses and structural stress, thereby alleviated the casting crack tendency, and plasticity is improved.Just can further be warming up to 1000～1050 ℃ of quenching temperatures behind the preheating samming with middle and high speed; Its purpose is to eliminate the carbide in the as-cast structure; Obtain single austenite structure; Because carbide can reduce the intensity of grillflooring and make the grillflooring embrittlement in the grillflooring, cause the grillflooring easy of crack.After quench in reasonable time insulation back.So not only can relax grillflooring poor thermal conductivity and the big influence of thermal expansivity when heating, and alleviate the phenomenon of top layer decarburization, demanganize and oxidation, improve wear resistance, prevent the grillflooring cracking.Grillflooring decarburization when high temperature, demanganize and oxidation are all very violent, and be but all very slight when 600～630 ℃ of low temperature.When low temperature heated up, the fragility of newly separating out can most of dissolving or all dissolvings 600～630 ℃ of sammings 1.5～2 hours.Therefore suitable soaking time can reach the effect of thickness samming in the table.Prolong soaking time and can reduce grillflooring fragility and tearing tendency, improve grillflooring plasticity and yield strength.
For strengthening the effect of high mangaenese steel plasticity_resistant deformation; Improve erosion-wear-resisting and cracking resistance ability,, adopt best aging treatment process to grillflooring; Grillflooring after being about to quench is heated to 250～300 ℃; It is cold to be incubated after 5～7 hours stove, the carbon of solid solution is separated out with the carbide form of small and dispersed, thereby given play to the strengthening effect of two-phase disperse.
Ball mill grillflooring displacement in service with 16Mn steel plate plug jail, solid welding, can be prevented in slit between grillflooring and the grillflooring, cut off the grillflooring joint bolt or damage grillflooring, make the grillflooring cracking.According to the gap size between the grillflooring, the Mn16 steel plate adopts processed.
Claims (2)
1. a ball mill grillflooring is prevented the cracking treatment process, it is characterized in that:
(1) grillflooring adopts the high manganese steel material ZGMn18Cr2MoVReSi that contains Cr, Mo metallic element; Process through lost foam casting;
(2) will cast good grillflooring puts into electrical heater and carries out heat tracing and handle; Be heated to 150 ℃～250 ℃ earlier, be incubated 1～2 hour, be 30 ℃～40 ℃/hour by speed then and be warmed up to 600 ℃～630 ℃, be incubated 4.0～4.5 hours; Continue to be warmed up to 1000 ℃～1050 ℃ by 50 ℃～60 ℃/speed at one hour rating again; Be incubated 2.5～3.0 hours; Through handling like this, the grillflooring carbide is dissolved in the austenite fully, to obtain higher strength and toughness;
(3) grillflooring is taken out from stove, the water of putting into temperature and be 25 ℃～35 ℃ carries out the tough processing of water, 2.0～2.5 hours tough treatment times of water; Purpose is the carbide of eliminating in the as-cast structure, obtains single austenite structure;
(4) grillflooring is taken out from water, put into tempering stove, be 30 ℃～40 ℃/hour by speed and be heated to 250 ℃～300 ℃, be incubated 5～7 hours, cool off with 1.0～2.0min/mm speed then; Intensity and hardness constantly descend in drawing process, and plasticity and toughness improve gradually;
(5) grillflooring is placed on carries out ageing treatment in the open; The ageing treatment time is 12～18 months, carries out natural aging treatment through natural condition such as Exposure to Sunlight rainforests, eliminates the internal stress of casting, prolongs the work-ing life of grillflooring.
2. the anti-cracking of ball mill grillflooring as claimed in claim 1 treatment process is characterized in that using and the abrading section according to grillflooring, adds the circular arc cracking strip at the grillflooring circumferential direction, adds radially cracking strip at the grillflooring radial direction; The major part of grillflooring is provided with the trapezoidal installation wedge head of being convenient to install in the outer ring; Grillflooring ore removal hole is a slotted hole; Section is trapezoidal; Ore removal hole longitudinal axis and ball mill radial direction angle are R=40 °～50 °, and the ore removal pitch of holes is 46-50mm, trapezoidal shape size upper base/go to the bottom * height * length=(18～22)/(32～36) * (100～130) * (150～200); Trapezoidal direction and ore removal are in the opposite direction, prevent that grillflooring from blocking up the ore deposit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103434846A CN102399960A (en) | 2011-11-03 | 2011-11-03 | Cracking-resistant treatment method for grid plate of ball mill |
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| CN2011103434846A CN102399960A (en) | 2011-11-03 | 2011-11-03 | Cracking-resistant treatment method for grid plate of ball mill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847589A (en) * | 2012-08-29 | 2013-01-02 | 江苏永钢集团有限公司 | Damp mill material outlet liner plate |
| CN105215270A (en) * | 2015-10-21 | 2016-01-06 | 南车长江车辆有限公司 | Thin-walled frame-type steel-casting cracking strip structure |
| CN106179634A (en) * | 2016-08-31 | 2016-12-07 | 陈江 | A kind of grate ball mill and ball mill grate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109384A (en) * | 1994-05-12 | 1995-10-04 | 河北机电学院 | Cast iron lining plate of ball mill and its producing method |
| CN1165203A (en) * | 1996-12-10 | 1997-11-19 | 魁永生 | Multicomponent alloy abrasion-resistant anti-corrosion high-ductility liner plate and its manufacturing method |
| CN101455986A (en) * | 2007-12-14 | 2009-06-17 | 鞍钢集团矿业公司 | Crusher duplex metal abrasion-proof backing block and manufacture method thereof |
| CN101623746A (en) * | 2009-08-13 | 2010-01-13 | 太原钢铁(集团)有限公司 | Method for preventing lining plate of ball grinder from cracking |
-
2011
- 2011-11-03 CN CN2011103434846A patent/CN102399960A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109384A (en) * | 1994-05-12 | 1995-10-04 | 河北机电学院 | Cast iron lining plate of ball mill and its producing method |
| CN1165203A (en) * | 1996-12-10 | 1997-11-19 | 魁永生 | Multicomponent alloy abrasion-resistant anti-corrosion high-ductility liner plate and its manufacturing method |
| CN101455986A (en) * | 2007-12-14 | 2009-06-17 | 鞍钢集团矿业公司 | Crusher duplex metal abrasion-proof backing block and manufacture method thereof |
| CN101623746A (en) * | 2009-08-13 | 2010-01-13 | 太原钢铁(集团)有限公司 | Method for preventing lining plate of ball grinder from cracking |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847589A (en) * | 2012-08-29 | 2013-01-02 | 江苏永钢集团有限公司 | Damp mill material outlet liner plate |
| CN105215270A (en) * | 2015-10-21 | 2016-01-06 | 南车长江车辆有限公司 | Thin-walled frame-type steel-casting cracking strip structure |
| CN105215270B (en) * | 2015-10-21 | 2017-08-08 | 中车长江车辆有限公司 | Thin-walled frame-type steel-casting cracking strip structure |
| CN106179634A (en) * | 2016-08-31 | 2016-12-07 | 陈江 | A kind of grate ball mill and ball mill grate |
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Application publication date: 20120404 |
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