CN101717895A - Crusher hammerhead cast of steel bond hard alloy bar and casting method of vanishing mould thereof - Google Patents
Crusher hammerhead cast of steel bond hard alloy bar and casting method of vanishing mould thereof Download PDFInfo
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- CN101717895A CN101717895A CN200910264654A CN200910264654A CN101717895A CN 101717895 A CN101717895 A CN 101717895A CN 200910264654 A CN200910264654 A CN 200910264654A CN 200910264654 A CN200910264654 A CN 200910264654A CN 101717895 A CN101717895 A CN 101717895A
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Abstract
The invention discloses a crusher hammerhead cast of a steel bond hard alloy bar and a casting method of a vanishing mould thereof. The hammerhead is cast by low-alloy steel and is cast with the steel bond hard alloy bar in the casting process; the low-alloy steel contains the following chemical components by weight percent: 0.24 wt% to 0.295 wt% of C, 1.32 wt% to 1.56 wt% of Si, 0.028 wt% to 0.035 wt% of S, 0.032 wt% to 0.038 wt% of P, 0.82 wt% to 1.22 wt% of Mn, 1.67 wt% to 2.10 wt% of Cr, 0.42 wt% to 0.51 wt% of Mo, 0.05 wt% to 0.08 wt% of V, 0.05 wt% to 0.07 wt% of Ti, 0.08 wt% to 0.15 wt% of RE and 93.942 wt% to 95.29 wt% of Fe. The casting method of the hammerhead comprises the production process of the low-alloy steel, and the casting process and the thermal treatment process of the vanishing mould. The hammerhead product cast with the steel bond hard alloy bar has the advantages of good strength and toughness and high rigidity and abrasive resistance, is suitable for various working conditions, and can crush objects with different hardness.
Description
Technical field
The present invention relates to grinder hammerhead and castmethod thereof, be specifically related to a kind of grinder hammerhead and lost-foam casting method thereof of castingin steel bond hard alloy bar.
Background technology
The hammer mill reduction ratio is big, less energy consumption, and discharging is even, is fit to broken various materials.But, on using, be restricted because the tup wearing and tearing are very fast.This problem has become domestic disintegrating apparatus manufacturing and has used the worry that producer suffers untold misery, and also is the problem that presses for solution.
The current material category that is used to make tup is a lot, mainly contains that common high mangaenese steel, middle-low alloy steel, rich chromium cast iron and tup adopt rich chromium cast iron and hammer handle adopts four big classes such as carbon steel.Common high mangaenese steel is adapted at using under the abrasive wear operating mode of greater impact load, and in, under the small energy impact, can only part or can not processedly harden in its surface, so not wear-resistant; Middle-low alloy steel, owing to lack the hard phase in the tissue, wear resistance is not good yet; The rich chromium cast iron wear resistance is good, but toughness is poor, and fracture easily is not suitable for the tup of big (more than the 500N) of workmanship; Tup adopts rich chromium cast iron and hammer handle adopts the composite hammer head of carbon steel, has complex manufacturing technology, and production efficiency is low, and poor working environment is in conjunction with problem such as insecure.
Work characteristics according to grinder hammerhead, should be fit to various operating mode (comprise high, medium and low shock stress and do, wet Working environment), be fit to broken various material (comprising high, medium and low hardness and large, medium and small lumpiness) again, it is difficult finding a kind of like this ideal hammer head material.In general, the tup that hardness is high more, wear resistance is just good more.Improve its wear resistance, will increase the hardness of material, but along with the raising of hardness, toughness will reduce.Hardness and impelling strength how to take into account tup are to improve the key of tup wear resistance.We can say that the material of desirable tup should be both hard and tough, but single material is difficult to satisfy this requirement.Therefore, make the grinder hammerhead that satisfies broken different material under various different working conditions, can only form with the differing materials produced with combination.
Summary of the invention
The objective of the invention is to: grinder hammerhead and lost-foam casting method thereof that a kind of castingin steel bond hard alloy bar is provided, it is main raw that tup adopts low alloy steel, abrading section at tup, by lost foam casting castingin steel bond hard alloy bar, tup product strength and the good toughness produced, hardness and wear resistance height are adapted at working under the various working condition, and material that can broken different hardness.
The technical solution adopted for the present invention to solve the technical problems is: this tup adopts the low alloy steel casting to form castingin steel bond hard alloy bar in castingprocesses; Wherein, the massfraction of the chemical ingredients of low alloy steel is: C 0.24%～0.295%, Si 1.32%～1.56%, S 0.028%～0.035%, P 0.032%～0.038%, Mn 0.82%～1.22%, Cr 1.67%～2.10%, Mo 0.42%～0.51%, V 0.05%～0.08%, Ti 0.05%～0.07%, RE 0.08%～0.15%, Fe 93.942%～95.29%; Wherein, the material of tup castingin is the GT35 steel bond hard alloy bar, is outsourcing piece, and diameter is 2～2.5mm, and the massfraction of its chemical ingredients is: TiC 31%, Cr 3%, Mo 3%, C 0.9%, Fe 62.10%, performance is: density/t.m
-36.4～6.6, bending strength/Mpa 1380～1760, impelling strength/J.cm
-239～78, hardness (HRC): as-annealed condition is 36～45, and the Annealed Strip of quenching is 66～69.
The castmethod of tup of the present invention, this castmethod comprises production process and the lost foam casting process and the heat treatment process of low alloy steel, wherein, the production process of low alloy steel is: ordinary scrap steel, ferrochrome, molybdenum-iron, ferrosilicon are added melting in the medium-frequency induction furnace, the molten clear back of molten steel adds ferromanganese, and the stokehold chemical analysis is carried out in sampling, adjusts composition, after composition is qualified temperature is increased to 1570 ℃～1600 ℃, adds the aluminium block deoxidation that accounts for molten steel quality 0.30%; In tapping process, add the processing of go bad of rare earth, 0.10%～0.20% ferrotianium, 0.10%～0.20% vanadium iron that granularity accounts for molten steel quality 0.20%～0.30% less than 6mm, leave standstill after the stirring and molten steel poured into formation tup foundry goods in the disappearance mould in 2～3 minutes; Wherein, the lost foam casting process is: at first, make the mould of the tup similar leg-of-mutton polystyrene of easy wearing part (Eps) foam mould, the diameter that has more dislocation to arrange on this foam mould is 2～2.5mm aperture, aperture is used for installing the GT35 steel bond hard alloy bar, foam mould for the tup main part then adopts plastic foamboard to form through cutting processing, on two that install steel bond hard alloy bar easy wearing part foam moulds, coat binding agent, and bonding with the foam mould of tup main part, paste gating system and rising head in addition; Then, the coating refractory paint, the integral body disappearance mould of completion has been pasted in the drying room oven dry that enters temperature and be 50 ℃; Then, the integral body disappearance mould of oven dry being imbedded in the dry sand, is that 50～60Hz, amplitude are that 1～2mm, acceleration are to carry out jolt ramming in 1～2g parameter area in vibrational frequency; At last, the low alloy steel molten steel is poured into formation tup foundry goods in the disappearance mould, low alloy steel molten steel teeming temperature is 1480 ℃～1520 ℃, and the negative-pressure vacuum degree is 0.02～0.04Mpa; Wherein, heat treatment process is: after the cast, when treating that the tup foundry goods is cooled to 980 ℃～1000 ℃, the tup foundry goods is hung out from disappearance sand case, move to the top in pond rapidly, free fall type crashes in the pond and quenches, remove after the room temperature water, rising head, be heated to 220 ℃ of insulation 2h air cooling of coming out of the stove in the chamber type electric resistance furnace of packing into.
Wherein, on the aperture of easy wearing part foam mould, insert the GT35 steel bond hard alloy bar that is cut into pieces; One end of the GT35 steel bond hard alloy bar that is cut into pieces is a cylindrical end, and this cylindrical end stretches out the easy wearing part foam mould 5～6mm that is inserted into, and purpose is to guarantee that steel bond hard alloy bar is unshift when accomplishing in the casting process gasification of disappearance mould; The other end of the GT35 steel bond hard alloy bar that is cut into pieces is the flats end, and this flats end is the flats that is hammered into, and has 3～5mm long, and purpose is for tup steel bond hard alloy bar difficult drop-off when working.
The present invention has the following advantages: it is main raw that (1) tup adopts low alloy steel, the back matrix that quenches is the good lath martensite of obdurability, the GT35 steel bond hard alloy bar of castingin forms the hard phase, reached both hard and tough effect, in, the tup wear resistance is more than 4 times of common high mangaenese steel when working under the low shock stress condition; (2) tup of the present invention can be fit to various operating mode, comprises high, medium and low shock stress and does, wets Working environment work down; (3) tup of the present invention can be fit to broken various material, comprises high, medium and low hardness and large, medium and small lumpiness; (4) tup of the present invention adopts lost foam casting, and technology is simple, production efficiency is high, and steady quality is reliable, and has solved traditional abominable root problem of casting making grinder hammerhead production environment of inlaying; (5) the steel bond hard alloy bar desired number of tup castingin of the present invention is few, in light weight, and cost is low, and difficult drop-off in the working process is effective.
Description of drawings
Fig. 1 is the integral body disappearance mould synoptic diagram of tup of the present invention
Fig. 2 is that the A of Fig. 1 is to view
Fig. 3 is that the easy wearing part of the tup of Fig. 2 is installed steel bond hard alloy bar B-B sectional view
Among the figure: 1,2 is easy wearing part foam mould, 3 is tup main part foam mould, and 4 for installing GT35 steel bond hard alloy bar aperture, and 5 is the GT35 steel bond hard alloy bar, 6 is the cylindrical end of GT35 steel bond hard alloy bar, and 7 is the flats end of GT35 steel bond hard alloy bar.
Embodiment
Further specify technical solution of the present invention below in conjunction with embodiment, but can not be interpreted as that these examples are the restrictions to technical scheme.
Embodiment 1: producing substance is the tup of 800N, and this tup adopts the low alloy steel casting to form castingin steel bond hard alloy bar in castingprocesses; Wherein, the massfraction of the chemical ingredients of low alloy steel is: C 0.24%, Si 1.32%, S0.028%, P 0.032%, Mn 0.82%, Cr 1.67%, Mo 0.42%, V 0.05%, Ti 0.05%, RE 0.08%, Fe 95.29%; Wherein, the material of tup castingin is the GT35 steel bond hard alloy bar, is outsourcing piece, and diameter is 2.5mm, and the massfraction of its chemical ingredients is: TiC 31%, Cr 3%, Mo 3%, C 0.9%, Fe 62.10%, performance is: density/t.m
-36.4～6.6, bending strength/Mpa 1380～1760, impelling strength/J.cm
-239～78, hardness (HRC): as-annealed condition is 36～45, and the Annealed Strip of quenching is 66～69.
The castmethod of tup of the present invention, this castmethod comprises production process and the lost foam casting process and the heat treatment process of low alloy steel, wherein, the production process of low alloy steel is: ordinary scrap steel, ferrochrome, molybdenum-iron, ferrosilicon are added melting in the medium-frequency induction furnace, the molten clear back of molten steel adds ferromanganese, and the stokehold chemical analysis is carried out in sampling, adjusts composition, after composition is qualified temperature is increased to 1570 ℃, adds the aluminium block deoxidation that accounts for molten steel quality 0.30%; In tapping process, add the processing of go bad of rare earth, 0.10% ferrotianium, 0.10% vanadium iron that granularity accounts for molten steel quality 0.20% less than 6mm, leave standstill after the stirring and molten steel poured into formation tup foundry goods in the disappearance mould in 2～3 minutes; Wherein, the lost foam casting process is: at first, make the tup similar leg-of-mutton polystyrene of easy wearing part (Eps) foam mould 1,2, see Fig. 1-3, the diameter that has more dislocation to arrange on this foam mould is a 2.5mm aperture 4, aperture 4 is used for installing GT35 steel bond hard alloy bar 5,3 of foam moulds for the tup main part adopt plastic foamboard to form through cutting processing, at easy wearing part foam mould 1, insert the GT35 steel bond hard alloy bar 5 that is cut into pieces on 2 the aperture 4, bar one end that is cut into pieces is a cylindrical end 6, this cylindrical end 6 stretches out foam mould 1,2 outer 5～6mm, purpose is to guarantee that steel bond hard alloy bar is unshift when accomplishing in the casting process gasification of disappearance mould, the other end of bar is a flats end 7, the flats of this flats end 7 for being hammered into, there is 3～5mm long, purpose is for tup steel bond hard alloy bar difficult drop-off when working, at two that install steel bond hard alloy bar 5 easy wearing part foam moulds 1, coat binding agent on 2, and bonding with the foam mould 3 of tup main part, paste gating system and rising head in addition; Then, the coating refractory paint, the integral body disappearance mould of completion has been pasted in the drying room oven dry that enters temperature and be 50 ℃; Then, the integral body disappearance mould of oven dry being imbedded in the dry sand, is that 50～60Hz, amplitude are that 1～2mm, acceleration are to carry out jolt ramming in 1～2g parameter area in vibrational frequency; At last, the low alloy steel molten steel is poured into formation tup foundry goods in the disappearance mould, low alloy steel molten steel teeming temperature is 1480 ℃, and the negative-pressure vacuum degree is 0.02～0.04Mpa; Wherein, heat treatment process is: after the cast, when treating that the tup foundry goods is cooled to 980 ℃～1000 ℃, the tup foundry goods is hung out from disappearance sand case, move to the top in pond rapidly, free fall type crashes in the pond and quenches, remove after the room temperature water, rising head, be heated to 220 ℃ of insulation 2h air cooling of coming out of the stove in the chamber type electric resistance furnace of packing into.
Embodiment 2: producing substance is the tup of 500N, and this tup adopts the low alloy steel casting to form castingin steel bond hard alloy bar in castingprocesses; Wherein, the massfraction of the chemical ingredients of low alloy steel is: C 0.267%, Si 1.44%, S 0.032%, P 0.035%, Mn 1.02%, Cr 1.89%, Mo 0.46%, V 0.05%, Ti 0.065%, RE 0.115%, Fe 94.626%; Wherein, the material of tup castingin is the GT35 steel bond hard alloy bar, is outsourcing piece, and diameter is 2.5mm, and the massfraction of its chemical ingredients is: TiC 31%, Cr 3%, Mo 3%, C 0.9%, Fe 62.10%, performance is: density/t.m
-36.4～6.6, bending strength/Mpa 1380～1760, impelling strength/J.cm
-239～78, hardness (HRC): as-annealed condition is 36～45, and the Annealed Strip of quenching is 66～69.
The castmethod of tup of the present invention, this castmethod comprises production process and the lost foam casting process and the heat treatment process of low alloy steel, wherein, the production process of low alloy steel is: ordinary scrap steel, ferrochrome, molybdenum-iron, ferrosilicon are added melting in the medium-frequency induction furnace, the molten clear back of molten steel adds ferromanganese, and the stokehold chemical analysis is carried out in sampling, adjusts composition, after composition is qualified temperature is increased to 1585 ℃, adds the aluminium block deoxidation that accounts for molten steel quality 0.30%; In tapping process, add the processing of go bad of rare earth, 0.15% ferrotianium, 0.15% vanadium iron that granularity accounts for molten steel quality 0.30% less than 6mm, leave standstill after the stirring and molten steel poured into formation tup foundry goods in the disappearance mould in 2～3 minutes; Wherein, the lost foam casting process is: at first, make the tup similar leg-of-mutton polystyrene of easy wearing part (Eps) foam mould 1,2, see Fig. 1-3, the diameter that has more dislocation to arrange on this foam mould is a 2.5mm aperture 4, aperture 4 is used for installing GT35 steel bond hard alloy bar 5,3 of foam moulds for the tup main part adopt plastic foamboard to form through cutting processing, at easy wearing part foam mould 1, insert the GT35 steel bond hard alloy bar 5 that is cut into pieces on 2 the aperture 4, bar one end that is cut into pieces is a cylindrical end 6, this cylindrical end 6 stretches out the outer 5～6mm of foam mould, purpose is to guarantee that steel bond hard alloy bar is unshift when accomplishing in the casting process gasification of disappearance mould, the other end of bar is a flats end 7, the flats of this flats end 7 for being hammered into, long 3～5mm, purpose is for tup steel bond hard alloy bar difficult drop-off when working, at two that install steel bond hard alloy bar 5 easy wearing part foam moulds 1, coat binding agent on 2, and bonding with the foam mould 3 of tup main part, paste gating system and rising head in addition; Then, the coating refractory paint, the integral body disappearance mould of completion has been pasted in the drying room oven dry that enters temperature and be 50 ℃; Then, the integral body disappearance mould of oven dry being imbedded in the dry sand, is that 50～60Hz, amplitude are that 1～2mm, acceleration are to carry out jolt ramming in 1～2g parameter area in vibrational frequency; At last, the low alloy steel molten steel is poured into formation tup foundry goods in the disappearance mould, low alloy steel molten steel teeming temperature is 1500 ℃, and the negative-pressure vacuum degree is 0.02～0.04Mpa; Wherein, heat treatment process is: after the cast, when treating that the tup foundry goods is cooled to 980 ℃～1000 ℃, the tup foundry goods is hung out from disappearance sand case, move to the top in pond rapidly, free fall type crashes in the pond and quenches, remove after the room temperature water, rising head, be heated to 220 ℃ of insulation 2h air cooling of coming out of the stove in the chamber type electric resistance furnace of packing into.
Embodiment 3: producing substance is the tup of 200N, and this tup adopts the low alloy steel casting to form castingin steel bond hard alloy bar in castingprocesses; Wherein, the massfraction of the chemical ingredients of low alloy steel is: C 0.295%, Si 1.56%, S 0.035%, P 0.038%, Mn 1.22%, Cr 2.10%, Mo 0.51%, V 0.08%, Ti 0.07%, RE 0.15%, Fe 93.942%; Wherein, the material of tup castingin is the GT35 steel bond hard alloy bar, is outsourcing piece, and diameter is 2mm, and the massfraction of its chemical ingredients is: TiC 31%, Cr 3%, Mo 3%, C 0.9%, Fe 62.10%, performance is: density/t.m
-36.4～6.6, bending strength/Mpa 1380～1760, impelling strength/J.cm
-239～78, hardness (HRC): as-annealed condition is 36～45, and the Annealed Strip of quenching is 66～69.
The castmethod of tup of the present invention, this castmethod comprises production process and the lost foam casting process and the heat treatment process of low alloy steel, wherein, the production process of low alloy steel is: ordinary scrap steel, ferrochrome, molybdenum-iron, ferrosilicon are added melting in the medium-frequency induction furnace, the molten clear back of molten steel adds ferromanganese, and the stokehold chemical analysis is carried out in sampling, adjusts composition, after composition is qualified temperature is increased to 1600 ℃, adds the aluminium block deoxidation that accounts for molten steel quality 0.30%; In tapping process, add the processing of go bad of rare earth, 0.20% ferrotianium, 0.20% vanadium iron that granularity accounts for molten steel quality 0.30% less than 6mm, leave standstill after the stirring and molten steel poured into formation tup foundry goods in the disappearance mould in 2～3 minutes; Wherein, the lost foam casting process is: at first, make the tup similar leg-of-mutton polystyrene of easy wearing part (Eps) foam mould 1,2, see Fig. 1-3, this foam mould 1, the diameter that has more dislocation to arrange on 2 is a 2mm aperture 4, aperture 4 is used for installing GT35 steel bond hard alloy bar 5, adopt plastic foamboard to form for 3 of tup main part foam moulds through cutting processing, at easy wearing part foam mould 1, insert the GT35 steel bond hard alloy bar that is cut into pieces on 2 the aperture 4, the end of bar of being cut into pieces is a cylindrical end 6, this cylindrical end 6 stretches out the outer 5～6mm of foam mould, purpose is to guarantee that steel bond hard alloy bar is unshift when accomplishing in the casting process gasification of disappearance mould, the other end of bar is a flats end 7, the flats of this flats end 7 for being hammered into, long 3～5mm, purpose is for tup steel bond hard alloy bar difficult drop-off when working, at two that install steel bond hard alloy bar 5 easy wearing part foam moulds 1, coat binding agent on 2, and bonding with the foam mould 3 of tup main part, also paste gating system and rising head; Then, the coating refractory paint, the integral body disappearance mould of completion has been pasted in the drying room oven dry that enters temperature and be 50 ℃; Then, the integral body disappearance mould of oven dry being imbedded in the dry sand, is that 50～60Hz, amplitude are that 1～2mm, acceleration are to carry out jolt ramming in 1～2g parameter area in vibrational frequency; At last, the low alloy steel molten steel is poured into formation tup foundry goods in the disappearance mould, low alloy steel molten steel teeming temperature is 1520 ℃, and the negative-pressure vacuum degree is 0.02～0.04Mpa; Wherein, heat treatment process is: after the cast, when treating that the tup foundry goods is cooled to 980 ℃～1000 ℃, the tup foundry goods is hung out from disappearance sand case, move to the top in pond rapidly, free fall type crashes in the pond and quenches, remove after the room temperature water, rising head, be heated to 220 ℃ of insulation 2h air cooling of coming out of the stove in the chamber type electric resistance furnace of packing into.
Claims (3)
1. the grinder hammerhead of a castingin steel bond hard alloy bar, this tup adopts the low alloy steel casting to form, it is characterized in that: castingin steel bond hard alloy bar in castingprocesses, wherein, the massfraction of the chemical ingredients of low alloy steel is: C0.24%～0.295%, Si 1.32%～1.56%, S 0.028%～0.035%, P 0.032%～0.038%, Mn 0.82%～1.22%, Cr 1.67%～2.10%, Mo 0.42%～0.51%, V 0.05%～0.08%, Ti 0.05%～0.07%, RE 0.08%～0.15%, Fe 93.942%～95.29%; Wherein, the material of tup castingin is the GT35 steel bond hard alloy bar, is outsourcing piece, and diameter is 2～2.5mm, and the massfraction of its chemical ingredients is: TiC 31%, Cr3%, Mo 3%, C 0.9%, Fe 62.10%, performance is: density/t.m
-36.4～6.6, bending strength/Mpa 1380～1760, impelling strength/J.cm
-239～78, hardness (HRC): as-annealed condition is 36～45, and the Annealed Strip of quenching is 66～69.
2. the lost-foam casting method of the grinder hammerhead of a kind of castingin steel bond hard alloy bar according to claim 1, it is characterized in that: this castmethod comprises production process and the lost foam casting process and the heat treatment process of low alloy steel, wherein, the production process of low alloy steel is: ordinary scrap steel, ferrochrome, molybdenum-iron, ferrosilicon are added melting in the medium-frequency induction furnace, the molten clear back of molten steel adds ferromanganese, the stokehold chemical analysis is carried out in sampling, adjust composition, after composition is qualified temperature is increased to 1570 ℃～1600 ℃, adds the aluminium block deoxidation that accounts for molten steel quality 0.30%; In tapping process, add the processing of go bad of rare earth, 0.10%～0.20% ferrotianium, 0.10%～0.20% vanadium iron that granularity accounts for molten steel quality 0.20%～0.30% less than 6mm, leave standstill after the stirring and molten steel poured into formation tup foundry goods in the disappearance mould in 2～3 minutes; Wherein, the lost foam casting process is: at first, make the tup similar leg-of-mutton polystyrene of easy wearing part (Eps) foam mould (1,2), this foam mould (1,2) diameter that has more dislocation to arrange on is 2～2.5mm aperture (4), aperture (4) is used for installing GT35 steel bond hard alloy bar (5), then adopt plastic foamboard to form for tup main part foam mould (3) through cutting processing, at two that install steel bond hard alloy bar (5) easy wearing part foam moulds (1,2) coat binding agent on, and bonding with the foam mould (3) of tup main part, paste gating system and rising head in addition; Then, the coating refractory paint, the integral body disappearance mould of completion has been pasted in the drying room oven dry that enters temperature and be 50 ℃; Then, the integral body disappearance mould of oven dry being imbedded in the dry sand, is that 50～60Hz, amplitude are that 1～2mm, acceleration are to carry out jolt ramming in 1～2g parameter area in vibrational frequency; At last, the low alloy steel molten steel is poured into formation tup foundry goods in the disappearance mould, low alloy steel molten steel teeming temperature is 1480 ℃～1520 ℃, and the negative-pressure vacuum degree is 0.02～0.04Mpa; Wherein, heat treatment process is: after the cast, when treating that the tup foundry goods is cooled to 980 ℃～1000 ℃, the tup foundry goods is hung out from disappearance sand case, move to the top in pond rapidly, free fall type crashes in the pond and quenches, remove after the room temperature water, rising head, be heated to 220 ℃ of insulation 2h air cooling of coming out of the stove in the chamber type electric resistance furnace of packing into.
3. the lost-foam casting method of the grinder hammerhead of a kind of castingin steel bond hard alloy bar according to claim 2 is characterized in that: go up at the aperture (4) of easy wearing part foam mould (1,2) and insert the GT35 steel bond hard alloy bar (5) that is cut into pieces; One end of the bar that is cut into pieces (5) is cylindrical end (6), and this cylindrical end (6) stretches out foam mould (1, the 2) outer rim 5～6mm of insertion; The other end of GT35 steel bond hard alloy bar (5) is flats end (7), the flats of this flats end (7) for being hammered into, long 3～5mm.
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