CN104164609A - Compound hammerhead of hammer crusher - Google Patents
Compound hammerhead of hammer crusher Download PDFInfo
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- CN104164609A CN104164609A CN201410355934.7A CN201410355934A CN104164609A CN 104164609 A CN104164609 A CN 104164609A CN 201410355934 A CN201410355934 A CN 201410355934A CN 104164609 A CN104164609 A CN 104164609A
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Abstract
The invention discloses a compound hammerhead of a hammer crusher. The compound hammerhead comprises a hammer handle and a hammer tip. The hammer handle is prepared from high-manganese steel and the hammer tip is prepared from high-chromium cast iron. The compound hammerhead comprises, by weight, 3.0-3.1% of C, 1.4-1.5% of Mn, 24.6-25% of Cr, 0.05-0.06% of Cu, 1.24-1.28% of Si, 0.3-0.4% of Mo, 0.04-0.05% of B, 0.4-0.6% of Re, less than or equal to 0.02% of S, less than or equal to 0.02% of P and the balance Fe. The hammer handle is prepared from high-manganese steel and has enough toughness. The hammer tip is prepared from high-chromium cast iron and has enough hardness and wear resistance. Through reasonable formula design, melting, deterioration, pouring and deoxidation, the hammer tip has good wear resistance, hardness, strength, corrosion resistance and toughness. Through control of casting time and sand mold temperature, shrinkage loosening and shrinkage cavity production is prevented, toughness and wear resistance of the hammer tip are improved, surface Shore A hardness is greater than or equal to 62 degrees, an impact value is greater than or equal to 8.0J/cm<2> and a service life is in a range of 12000-13000h.
Description
Technical field
The present invention relates to tup technical field, be specifically related to a kind of hammer mill composite hammer.
Background technology
Hammer mill is the widely used production units of industrial sector such as building materials, metallurgy, chemical fertilizer, and tup is the vulnerable part that consumption is very large.The working-surface of tup contacts with material, produces heavily stressed wearing and tearing.Because the material that is broken is generally the hard objects such as rock, metallic ore, the wearing and tearing of part are more serious.By tup surface microscopic topographic is analyzed, the wear process of tup belongs to the result of distortion and erosive wear comprehensive action.This is that the motional inertia of tup hits and attrition crushing material due to the running up of tup surface.In the process of relative movement, these materials and piece surface interact, just do not slide, and modes such as impacting in addition, roll, wash away.When abrasive hardness surpasses material hardness, the corner angle of abrasive material will thrust that material surface makes material generation plastic flow and the surrounding that is expressed to pit, and to a certain extent, abrasive grain is crushed for material deformation.A plurality of particles contact with deformable material around hole, make it again distortion, and plastic flow occurs, and work hardening capacity further increases.When surpassing the strain fatigue limit of material, forming grinding comes off.
Tup is one of crusher kernel component, is arranged on the hammer axle of crusher rotor, and tup directly hits material when crusher runs up, and finished breaking becomes suitable raw meal particle size.
In Chinese Patent Application No.: disclose a kind of high chromium composite hammer head in 201010548434, comprised hammer body and hammer handle, the alloy compositions weight ratio of hammer body is: C:1.00～1.50%, Si:1.0～1.5%, Mn:1.2～1.7%, P:0.047%, S:0.015%, Ni:0.99%, Cv:20.0～23.0%, Mo:1.20～1.60%, Cu:0.65%, V=0.45, all the other are Cr and inevitable impurity, each component sum is absolutely.In this technical scheme, contain more Ni, Mo, cost is higher, and toughness is inadequate, and work-ing life is short.
In Chinese Patent Application No.: disclose a kind of rich chromium cast iron wear-resistant hammer head in 201210368269, this wear-resistant hammer head rich chromium cast iron composition of raw materials take mass percent as: carbon 2.4-3.2%, chromium 19-21%, manganese 0.5-1.0%, silicon 0.4-0.8%, molybdenum 1.0-2.0%, nickel 1.0-2.0%, copper 0.8-1.2%, phosphorus content are controlled at below 0.05%, sulphur content is controlled at below 0.05%, and its surplus is main raw material iron; The working method of this wear-resistant hammer head is: first adopt common medium-carbon steel design to cast out the hammer handle that is applicable to second casting rich chromium cast iron tup; The rich chromium cast iron of casting from the above mentioned in the work section of putting forth effort of hammer handle again, twice casting all adopts conventional thermal treatment process to carry out, and through above-mentioned second casting technique, obtains this rich chromium cast iron wear-resistant hammer head.In this technical scheme, along with C amount improves, carbide increases; Along with the increase of Cr/C ratio, the pattern of eutectic carbides has experienced by the process that continuous net-shaped → sheet → shaft-like continuity degree reduces, and eutectic carbides crystal type experience is by the change procedure of M3C → M3C+M7C3 → M7C3.When eutectic carbides is constant, and Cr/C is while being 6.5-8, and the failure crack extended capability of rich chromium cast iron is the strongest.According to these principles, C amount should be decided to be to 3.1-3.6%, Cr amount is 20-27%, the formula of this technical scheme needs further to optimize and improve.
In Chinese Patent Application No.: disclose wear-resistant hammer head of a kind of hammer mill and preparation method thereof in 201310238299, comprise the end of tup and the shank of tup, it is characterized in that: the end of tup is rich chromium cast iron, its composition is by weight percentage: C:2.40%～3.20%, Si:0.30%～1.50%, Mn:0.50%～2.0%, Cr:12.0%～18.0%, P :≤0.10%, S :≤0.06%, Ce:0.04%, V:0.10%～0.20%, Yu Weitie; The shank of tup is medium carbon low alloy steel, and its composition is by weight percentage: C:0.30%～0.50%, Si:0.30%～1.0%, Mn:0.70%～1.5%, Cr:1.0%～3.0%, Mo:0.15%～0.25%, P :≤0.04%, S :≤0.04%, Yu Weitie.The ratio of the carbon of the rich chromium cast iron of the tup in this technical scheme and chromium content is not optimum, and the content of chromium is on the low side, and wear resistance is inadequate, and this technical scheme has much room for improvement.
Summary of the invention
For the problems referred to above, the invention provides a kind of hammer mill composite hammer, there is good mechanical property, long service life.
In order to address the above problem, technical scheme provided by the invention is:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.0-3.1%, Mn:1.4-1.5%, Cr:24.6-25%, Cu:0.05-0.06%, Si:1.24-1.28%, Mo:0.3-0.4%, B:0.04-0.05%, Re:0.4-0.6%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
Preferably, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.0-3.08%, Mn:1.42-1.5%, Cr:24.6-24.8%, Cu:0.052-0.06%, Si:1.25-1.28%, Mo:0.32-0.4%, B:0.043-0.05%, Re:0.4-0.55%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
Preferably, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.08%, Mn:1.42%, Cr:24.8%, Cu:0.052%, Si:1.25%, Mo:0.32%, B:0.048%, Re:0.55%, S:0.02%, P:0.01%; Surplus is Fe.
Preferably, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.02%, Mn:1.48%, Cr:24.6%, Cu:0.057%, Si:1.27%, Mo:0.35%, B:0.043%, Re:0.45%, S:0.01%, P:0.02%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1550-1555 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1570-1575 ℃, within before tapping a blast furnace 6-8 minutes, add the ferro-boron processing of going bad, and within before tapping a blast furnace 3-4 minutes, adds aluminum strip to carry out deoxidation treatment;
(3) pour molten iron into ladle, 1500-1520 ℃ of temperature; Add Re to carry out inoculation: granularity 0.8-1.0mm adds when 40-45% molten iron is poured ladle into; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 8-10 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1400-1420 ℃;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.2-1.4 hours, when temperature is 640-650 ℃, are incubated 1.2-1.4 hours; When temperature is 1040-1050 ℃, be incubated 1.4-1.5 hours, then air quenching is 1 hour;
(7) temper: when temperature is 220-230 ℃, be incubated 1.2-1.4 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 580-600 ℃, be incubated 1.4-1.5 hours, be then cooled to room temperature.
Preferably, in step (1), the material of sand mold is: roughing sand: 80-84 parts, organic ester water glass: 3-4 parts, dispersant: 1-2 parts.
Preferably, before step (5) casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire.
Preferably, during step (5) casting, the temperature of sand mold is controlled at 230-240 ℃.Prevent the generation of shrinkage porosite, shrinkage cavity.
Preferably, step (5) casting duration is 6-8 minutes.After avoiding iron liquid rotten, fail to original state, prevent the generation of shrinkage porosite, shrinkage cavity simultaneously, avoid reducing organic connections and the strength of joint of microstructure density and density and intergranule, thereby avoid reducing toughness and the wear resistance of hammer tip.
Rich chromium cast iron as-cast microstructure white base when room temperature is primary austenite and transmutation product thereof, and bone shape is organized as the ingotism that eutectic carbides forms mutually.The eutectic crystallization of rich chromium cast iron is different from ordinary white cast iron, and when in cast iron, chrome content is enough high, the solid-liquid phase interface of eutectic crystallization is irregular, and it is wider that crystal region becomes, and presents the feature of pasty state crystallization.Like this, while being as cold as eutectic line, eutectic carbides is tending towards facet mode and grows, and being tending towards dendroid mode, eutectic austenite grows, like this, the eutectic cementite of ordinary white cast iron is en plaque structure, and rich chromium cast iron eutectic carbides is interrupted bulk, and Here it is rich chromium cast iron resistance to abrasion and mechanical property are better than the major cause of ordinary white cast iron.
Tissue and the performance of rich chromium cast iron are said in some sense, depend primarily on the content of chromium and carbon.During high-carbon low-chromium, its eutectic carbides is M
3c; During the high chromium of low-carbon (LC), its eutectic carbides is M
23c
6; Carbon can obtain desirable M with suitable cooperation of chromium
7c
3.M
7c
3hardness reach 1200～1800HV, hexagonal system, this carbide is isolated to distribute, and is group spherical and chrysanthemum shape and a vermiform, less to the effect of isolating of matrix, the toughness of rich chromium cast iron is better.Carbon amount determines carbide quantity, along with carbon content increases, will increase carbide quantity, improves wear resistance.But along with carbon content increases solid solution alloy element in matrix, reduce, make matrix can not get strengthening, cause that hardening capacity reduces.
For rich chromium cast iron, the wear resistance of quenching state is better than as cast condition, no matter is quenching state or as cast condition, and its wear resistance increased and improves with carbon content before this, and when carbon content reaches 3.1%, wear resistance is best, further improves carbon content wear resistance and reduces gradually.Chromium amount determines carbide, and it is mainly in microstructure, to contain due to more M7C3 carbide that rich chromium cast iron has superior wear resistance.In carbide and wear resistance relation, wear resistance is also first with carbide amount, to increase and improve, and when carbide amount is increased to 30%, the raising of wear resistance is just not obvious.
Chromium, except forming carbide with carbon, is still partially dissolved in austenite and improves hardening capacity, when the constant increase chromium of carbon amount amount, or the constant reduction carbon of chromium amount amount, all can make hardening capacity improve.When eutectic carbides is constant, and Cr/C is while being 6.5-8, and the failure crack extended capability of rich chromium cast iron is the strongest, comprehensively analyzes C:3.0-3.1%, Cr:24.6-25%.
C: form stable compound with Fe, Cr, Mn, improve hardness and wear resistance by thermal treatment; C and other elements produce synergy, improve the over-all properties of hammer tip.
Mn: be strengthening element, incorporate ferrite, strengthening matrix, can thinning microstructure, improves intensity, hardness, the wear resistance of hammer tip.
Cr: improve the hardening capacity of material, can effectively prevent that the graphite of free state from producing, make common cementite change alloyed cementite into, to improve intensity and the hardness of hammer tip integral body, there is good erosion resistance and antioxidant property, stop greying, improve hardening capacity.
Si: general w (Si) is controlled between 0.5%～1.3%.Along with the further investigation of rich chromium cast iron, in many developed countries standard, silicone content is controlled at and is less than 1.5%, and majority is controlled at 1.2～1.3%, and especially during production wet-milling foundry goods, what silicon was controlled reaches the standard grade, to improve solidity to corrosion.Higher silicon is conducive to improve the Production Practice of Casting Technologies of cast iron, as mobility, be beneficial to deoxidation; Improve eutectic carbides shape; Increase eutectic carbides quantity, the avidity of silicon and iron is greater than the avidity of chromium and iron; The advantageous effects such as strengthening matrix.It is worthy of note: when silicon amount transfinites, hardening capacity deficiency will cause the wear resistance that affects material.
Mo: in rich chromium cast iron, a part enters carbide, a part is dissolved in austenite, in Hypoeutectic high-chromium white cast iron, the molybdenum dissolving in austenitic matrix is mainly to improve hardening capacity, can effectively suppress cementite and assemble, strengthening austenite structure, increases intensity and hardness, strain-hardening performance strengthens, thereby improves fastness to wear.
Cu: can strengthen collective, improve hardening capacity, cost performance is higher than Ni.
B: crystal grain thinning, especially eutectic carbides; Improve hardening capacity.
Re: toughness and the wear resistance of improving hammer tip.
Compared with prior art, beneficial effect of the present invention is:
Hammer handle of the present invention adopts high mangaenese steel, has enough toughness; Hammer tip adopts rich chromium cast iron, has enough hardness, wear resistance; By complete processings such as rational formula design, melting, rotten, casting, deoxidations, allow hammer tip there is good wear resistance, hardness, intensity, erosion resistance, toughness, by the control of pouring time, sand mold temperature, prevent the generation of shrinkage porosite, shrinkage cavity, also toughness and the wear resistance of hammer tip have been improved, Shao Shi A type hardness tester>=62, surface degree, impact value>=8.0J/cm
2, be 12000-13000 hours work-ing life.
Embodiment
Below the present invention will be further described:
Embodiment 1:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.0%, Mn:1.5%, Cr:24.6%, Cu:0.06%, Si:1.24%, Mo:0.4%, B:0.04%, Re:0.6%, S:0.02%, P:0.012%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold, the material of sand mold is: roughing sand: 80 parts, organic ester water glass: 4 parts, dispersant: 1 part;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1555 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1570 ℃, tap a blast furnace and within first 8 minutes, add the ferro-boron processing of going bad, and taps a blast furnace and adds aluminum strip to carry out deoxidation treatment in first 3 minutes;
(3) pour molten iron into ladle, 1520 ℃ of temperature; Add Re to carry out inoculation: granularity 0.8mm, when 45% molten iron is poured ladle into, add; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 8 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1420 ℃, before casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire, during casting, the temperature of sand mold is controlled at 230 ℃, and casting duration is 8 minutes;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.2 hours, when temperature is 650 ℃, are incubated 1.2 hours; When temperature is 1050 ℃, be incubated 1.4 hours, then air quenching;
(7) temper: when temperature is 230 ℃, be incubated 1.2 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 600 ℃, be incubated 1.4 hours, be then cooled to room temperature.
Embodiment 2:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.1%, Mn:1.4%, Cr:25%, Cu:0.05%, Si:1.28%, Mo:0.3%, B:0.05%, Re:0.4%, S:0.01%, P:0.02%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold, the material of sand mold is: roughing sand: 84 parts, organic ester water glass: 3 parts, dispersant: 2 parts;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1550 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1575 ℃, tap a blast furnace and within first 6 minutes, add the ferro-boron processing of going bad, and taps a blast furnace and adds aluminum strip to carry out deoxidation treatment in first 4 minutes;
(3) pour molten iron into ladle, 1500 ℃ of temperature; Add Re to carry out inoculation: granularity 1.0mm, when 40% molten iron is poured ladle into, add; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 10 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1400 ℃, before casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire, during casting, the temperature of sand mold is controlled at 240 ℃, and casting duration is 6 minutes;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.4 hours, when temperature is 640 ℃, are incubated 1.4 hours; When temperature is 1040 ℃, be incubated 1.5 hours, then air quenching;
(7) temper: when temperature is 220 ℃, be incubated 1.4 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 580 ℃, be incubated 1.5 hours, be then cooled to room temperature.
Embodiment 3:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.05%, Mn:1.45%, Cr:24.7%, Cu:0.055%, Si:1.26%, Mo:0.35%, B:0.045%, Re:0.45%, S:0.01%, P:0.015%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold, the material of sand mold is: roughing sand: 82 parts, organic ester water glass: 3.5 parts, dispersant: 1.5 parts;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1552 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1574 ℃, tap a blast furnace and within first 7 minutes, add the ferro-boron processing of going bad, and taps a blast furnace and adds aluminum strip to carry out deoxidation treatment in first 3.5 minutes;
(3) pour molten iron into ladle, 1510 ℃ of temperature; Add Re to carry out inoculation: granularity 0.9mm, when 42% molten iron is poured ladle into, add; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 9 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1410 ℃, before casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire, during casting, the temperature of sand mold is controlled at 235 ℃, and casting duration is 7 minutes;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.3 hours, when temperature is 645 ℃, are incubated 1.3 hours; When temperature is 1045 ℃, be incubated 1.45 hours, then air quenching;
(7) temper: when temperature is 225 ℃, be incubated 1.3 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 590 ℃, be incubated 1.45 hours, be then cooled to room temperature.
Embodiment 4:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.08%, Mn:1.42%, Cr:24.8%, Cu:0.052%, Si:1.25%, Mo:0.32%, B:0.048%, Re:0.55%, S:0.02%, P:0.01%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold, the material of sand mold is: roughing sand: 82 parts, organic ester water glass: 3 parts, dispersant: 2 parts;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1550 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1572 ℃, tap a blast furnace and within first 6 minutes, add the ferro-boron processing of going bad, and taps a blast furnace and adds aluminum strip to carry out deoxidation treatment in first 4 minutes;
(3) pour molten iron into ladle, 1508 ℃ of temperature; Add Re to carry out inoculation: granularity 0.85mm, when 42% molten iron is poured ladle into, add; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 8.5 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1415 ℃, before casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire, during casting, the temperature of sand mold is controlled at 235 ℃, and casting duration is 6.5 minutes;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.25 hours, when temperature is 645 ℃, are incubated 1.25 hours; When temperature is 1048 ℃, be incubated 1.42 hours, then air quenching;
(7) temper: when temperature is 222 ℃, be incubated 1.35 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 595 ℃, be incubated 1.42 hours, be then cooled to room temperature.
Embodiment 5:
A kind of hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.02%, Mn:1.48%, Cr:24.6%, Cu:0.057%, Si:1.27%, Mo:0.35%, B:0.043%, Re:0.45%, S:0.01%, P:0.02%; Surplus is Fe.
The preparation method of composite hammer for hammer mill, comprises the following steps:
(1) prepare sand mold, the material of sand mold is: roughing sand: 83 parts, organic ester water glass: 3.2 parts, dispersant: 1.5 parts;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1553 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1573 ℃, tap a blast furnace and within first 7.5 minutes, add the ferro-boron processing of going bad, and taps a blast furnace and adds aluminum strip to carry out deoxidation treatment in first 3.6 minutes;
(3) pour molten iron into ladle, 1515 ℃ of temperature; Add Re to carry out inoculation: granularity 0.85mm, when 42% molten iron is poured ladle into, add; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 9 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1416 ℃, before casting, on the surface of sand mold, smear alcohol, and the sintering of lighting a fire, during casting, the temperature of sand mold is controlled at 232 ℃, and casting duration is 6.5 minutes;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.2 hours, when temperature is 650 ℃, are incubated 1.2 hours; When temperature is 1050 ℃, be incubated 1.4 hours, then air quenching;
(7) temper: when temperature is 230 ℃, be incubated 1.2 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 585 ℃, be incubated 1.48 hours, be then cooled to room temperature.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (9)
1. a hammer mill composite hammer, comprise hammer handle and hammer tip, hammer handle is high mangaenese steel, it is characterized in that: hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.0-3.1%, Mn:1.4-1.5%, Cr:24.6-25%, Cu:0.05-0.06%, Si:1.24-1.28%, Mo:0.3-0.4%, B:0.04-0.05%, Re:0.4-0.6%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
2. hammer mill composite hammer according to claim 1, it is characterized in that: hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.0-3.08%, Mn:1.42-1.5%, Cr:24.6-24.8%, Cu:0.052-0.06%, Si:1.25-1.28%, Mo:0.32-0.4%, B:0.043-0.05%, Re:0.4-0.55%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
3. hammer mill composite hammer according to claim 1 and 2, it is characterized in that: hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.08%, Mn:1.42%, Cr:24.8%, Cu:0.052%, Si:1.25%, Mo:0.32%, B:0.048%, Re:0.55%, S:0.02%, P:0.01%; Surplus is Fe.
4. hammer mill composite hammer according to claim 1 and 2, it is characterized in that: hammer tip is rich chromium cast iron, and each composition and weight percent are: C:3.02%, Mn:1.48%, Cr:24.6%, Cu:0.057%, Si:1.27%, Mo:0.35%, B:0.043%, Re:0.45%, S:0.01%, P:0.02%; Surplus is Fe.
5. the preparation method of composite hammer for hammer mill according to claim 1 and 2, is characterized in that, comprises the following steps:
(1) prepare sand mold;
(2) raw material melting: add steel scrap and the pig iron molten clear, first cover liquid level with pearl sand, temperature adds ferromanganese while being 1550-1555 ℃; Temperature adds ferrosilicon, ferrochrome adjusting component while being 1570-1575 ℃, within before tapping a blast furnace 6-8 minutes, add the ferro-boron processing of going bad, and within before tapping a blast furnace 3-4 minutes, adds aluminum strip to carry out deoxidation treatment;
(3) pour molten iron into ladle, 1500-1520 ℃ of temperature; Add Re to carry out inoculation: granularity 0.8-1.0mm adds when 40-45% molten iron is poured ladle into; Finally add ladle covering agent;
(4) in ladle, add the poly-slag agent of insulation to cover liquid level, and calm 8-10 minutes, then the processing of skimming;
(5) casting: hammer handle is placed in sand mold, then to smear massfraction on hammer handle be 40% hydrochloric acid, then cast, temperature is 1400-1420 ℃;
(6) quench treatment: 200 ℃ of following shove charges, 200 ℃ of insulations 1.2-1.4 hours, when temperature is 640-650 ℃, are incubated 1.2-1.4 hours; When temperature is 1040-1050 ℃, be incubated 1.4-1.5 hours, then air quenching;
(7) temper: when temperature is 220-230 ℃, be incubated 1.2-1.4 hours, then heat 2 hours with the speed of 180 ℃/h, when temperature is 580-600 ℃, be incubated 1.4-1.5 hours, be then cooled to room temperature.
6. the preparation method of composite hammer for hammer mill according to claim 5, is characterized in that: in step (1), the material of sand mold is: roughing sand: 80-84 parts, organic ester water glass: 3-4 parts, dispersant: 1-2 parts.
7. the preparation method of composite hammer for hammer mill according to claim 5, is characterized in that: step (5) is smeared alcohol on the surface of sand mold before casting, and the sintering of lighting a fire.
8. the preparation method of composite hammer for hammer mill according to claim 5, is characterized in that: during step (5) casting, the temperature of sand mold is controlled at 230-240 ℃.
9. the preparation method of composite hammer for hammer mill according to claim 5, is characterized in that: step (5) casting duration is 6-8 minutes.
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| CN104946988A (en) * | 2015-06-11 | 2015-09-30 | 柳州金特新型耐磨材料股份有限公司 | Evanescent mode casting hammerhead |
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Address after: 242300 Fancun Road, heli Park, Ningguo Economic and Technological Development Zone, Xuancheng City, Anhui Province Patentee after: Ningguo Kaiyuan Electric POWER WEAR Resistant MATERIALS Co.,Ltd. Address before: 242300 Heli Industrial Concentration Zone, Ningguo Economic and Technological Development Zone, Xuancheng, Anhui Province Patentee before: NINGGUO KAIYUAN ELECTRIC POWER WEAR RESISTANT MATERIALS Co.,Ltd. |