CN1015609B - Coated hammer sheet and its manufacture method and the box bowl for producing - Google Patents
Coated hammer sheet and its manufacture method and the box bowl for producingInfo
- Publication number
- CN1015609B CN1015609B CN 89106981 CN89106981A CN1015609B CN 1015609 B CN1015609 B CN 1015609B CN 89106981 CN89106981 CN 89106981 CN 89106981 A CN89106981 A CN 89106981A CN 1015609 B CN1015609 B CN 1015609B
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- China
- Prior art keywords
- hammer leaf
- coating
- hammer
- saggar
- alloy
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Abstract
The present invention relates to a hammer sheet with high abrasion resistance, and a making method thereof. The present invention is characterized in that a high abrasion-resistance alloy coating layer is sintered and combined on the work head of the hammer sheet by a superficial metallurgy sintering coating layer method. The hammer sheet after sintering the coating layer has the advantages of uniform weight, high and uniform hardness, high HRC (which reaches about 70), good actual use effect (which is obviously superior to that of an overlaying-welding hammer sheet), long service life of the hammer sheet, steel saving and low use unit production cost. The sintering coating layer has the advantages of simple technique, high stability and reliability, less alloy consumption, easy control of the sintering quality, no coating layer dilution and high rate of finished products, and is suitable for mass production. The present invention is suitable for preparing new hammer sheets and repairing old hammer sheets, and has high technical economic benefit.
Description
The present invention relates to a kind of head clinkering has the hammer mills and the manufacture method thereof of surface hard material.
Hammer leaf because of and existed impact wear and the particle fretting wear that goes round and begins again between comminuted material, use very easily wearing and tearing.Both at home and abroad to improving the wearability of hammer leaf, prolong monolithic service life, the method for generally taking has: select wear-resisting hard alloy steel monoblock cast for use; Heat treatment (as element infiltration thermo-chemical treatment) is modified; The part applies surperficial hardened wear-resistant layer.
The wearing and tearing of hammer leaf mainly are at hammer leaf head working face, especially head two corner angle.Steel alloy monoblock cast and heat treatment quenching and tempering are to improve the hammer leaf wearability on the whole, and to apply surperficial hardened wear-resistant layer be low to technical economic benefit in the part.Part commonly used applies the wearing layer method for to apply certain thickness wearing layer with built-up welding or casting method clinkering on hammer leaf head working face.
U.S. Pat 3045934 has been narrated a kind of improvement hammer leaf at head founding (knot) diamondite.To improve the wearability of hammer leaf work head.It is that hammer leaf matrix head is processed into zigzag, is heated critical molten condition with flame, zigzag space as described in will being filled into the alloy material that contains 60% tungsten carbide (as containing the steel pipe of the tungsten carbide) casting of flame heat fusing then.The hammer leaf head is processed into zigzag, its objective is the bonded area that improves hard material and matrix, prevents that it from coming off.This improvement hammer leaf, processed complex need be processed into zigzag, is unfavorable for using the reparation of wearing and tearing hammer leaf, waste material, the hard material consumption is also many, and is uneconomical.Use the casting method clinkering, the technology controlling and process difficulty, not enough as the heating of hammer body surface, clinkering does not reach metallurgical binding, and hard material and matrix bond fastness are poor; Matrix surface heating and melting, then a large amount of elemental irons easily spread to the clinkering layer from matrix, form the mutual melting zone of broad, cause the clinkering layer by " dilution ", have reduced the original antiwear characteristic of the laminated gold of clinkering; And hard material diamondite particle distributes in the filling metal that has melted and is difficult for evenly easily causing the inhomogeneities of hardened layer tissue and hardness.Defective such as in fusion-casting process, be prone to pore in addition, be mingled with, so quality is wayward.These defectives are more difficult to get control and eliminate in actual production, operating process, directly influenced the technical economic benefit of clinkering.
The objective of the invention is to overcome the defective of above-mentioned prior art, provide a kind of easy to make, quality is easy to control, and the alloyed powder consumption is few, and is strong in conjunction with fastness, the composite coating hammer leaf that technical economic benefit is good.
Another object of the present invention is to provide a kind of method of making above-mentioned coating hammer leaf, and be suitable for convenient batch process the in batches, help stable improving the quality of products, guarantee that the special use of this coating hammer leaf of manufacturing of coating weight uniformity fuses saggar.
Coating hammer leaf of the present invention is characterized in that described clinkering layer is the tungsten carbide powder of 25%-45%, the compound alloy coat that all the other are formed for self-fluxing powder.The clinkering of alloy coat is that the alloyed powder with the workpiece (hammer leaf matrix) and the coating that applies lies against in the sintering saggar that can contain and coincide substantially with the Worker's Stadium; be flat in the calcining kiln then; under protective atmosphere or negative pressure, be warming up to coating alloy and liquid phase occurs; with stove cooling, the sintering saggar is that employing refractory ceramics high temperature resistant and that can not be melted the Heat stability is good that alloy soaks into maybe can produce the titaniferous of form compact and stable protective oxide layer or the alloy of aluminium or chromium is made.
Describe coating formation of the present invention and manufacture method and used frock in detail below in conjunction with accompanying drawing.Two work heads at hammer leaf 1, with surface metallurgic fused slurry coating method, the compound layer of surface hardened artiwear of clinkering alloy coat 2, this hardened artiwear alloy coat is that all self-fluxing powder is composite preferably forms for tungsten carbide (WC) powder with high hardness wear-resisting and toughness and hardness, make coating both have high wearability, have again with strong (metallurgy) of matrix and combine fastness.Wherein the diamondite powder accounts for the 25%-45% of compound bronze (weight), all the other are the self-fluxing powder parent, it can be nickel (Ni) base, cobalt (Co) base, iron (Fe) base or its combination, adamant tungsten carbide particulate even dispersion is in parent, coated by the parent fine-particle powder, constitute the heterogeneous cladded type hard coating material that all mixes, its granularity can be the 140-320 order.From molten precursor alloy powder and the firm metallurgical binding of the molten mutually formation of matrix diffusion, make hard point evenly fixedly be coated in the hammer body head, make coating integral body all effectively improve in conjunction with fastness and hardness.The adamant tungsten carbide is excellent with (weight) 35%-40% especially in the composite alloy powder.Table 1 is several common coatings alloyed powder parent prescriptions and chemical composition, and table 2 is basic composite wear-resisting alloy coating formula commonly used.(table 1, table 2 are seen below)
Prolonging monolithic service life, satisfy practical effect, reduce the coating consumption, increase economic efficiency hammer leaf matrix work head, can be processed into blunt round or approximate blunt round (as rectangle hammer leaf head two corner angle are cut), can effectively increase the wearing layer thickness at place easy to wear like this, increase the service life, can save the alloyed powder consumption again, reduce production costs processing (compound) back hammer leaf good looking appearance.
The manufacture method of aforesaid coating hammer leaf, steel plate is handled (forging and pressing or shearing) old hammer leaf after moulding maybe will be worn and torn, Local treatment such as warp as cleaning decontamination, removal oxide layer, flat being horizontally-arranged in the special-purpose sintering saggar, a certain amount of composite wear-resisting alloy powder is applied (filling) in hammer leaf two work heads (face to be coated with), lie against in the fused slurry coating stove, under protective atmosphere or negative pressure, carry out clinkering, the alloyed powder melted by heating of hammer leaf head coating; It is also molten mutually with the matrix diffusion to soak into matrix, after the stove cooling, can both be kept original coating alloy performance, again and form the coating hammer leaf of firm metallurgical binding between the matrix.
The alloyed powder of coating can be a dry powder, it also can be the pasty state wet-milling that is mixed into by adhesive (rosin as 35% and 65% turpentine oil), be excellent with wet-milling especially wherein, to avoid the inhomogeneities of coating amount, the wet-milling coating, also can be earlier wet-milling to be applied to hammer leaf two work heads, after drying is repaiied type, place special-purpose sintering saggar to put into the calcining kiln clinkering.
For improving the clinkering quality, obtain the high-quality coating of dense non-porous and firm metallurgical binding, avoid particularly excessive diffusion " dilution " coating of ferro element of interface element, therefore, must strict control fuse technology, fusing sintering temperature is looked the composite alloy powder, liquid phase (during fusion temperature) occurring with coating alloy is advisable, make the coating alloy can the infiltrated with molten metal matrix, form good liquid-solid diffusion, can avoid Yin Gaowen to cause excessive diffusion and produce " dilution " phenomenon again, to obtain having the firm metallurgical binding in narrow mutual melting zone.It is as follows specifically to fuse technological parameter:
Vacuum 6.666-1.333Pa
Fusing sintering temperature 1050-1280 ℃
The type of cooling is cooled off with stove
Fuse process floating coat alloy homogeneous immersion matrix for making, the molten alloy cross flow is piled up, guarantee the uniformity and the hammer leaf weight consistency of clinkering coating, adapt to and produce in batches, reduce product cost, raising fuses yield rate, and the hammer leaf of coating alloyed powder should be placed on special use and fuse clinkering in the saggar.Fuse saggar and be a rectangle saggar that coincide with hammer leaf, its periphery height is greater than hammer leaf thickness (as being twice in hammer leaf thickness).Saggar both can stop conformal to fused coating in high-temperature melting, it is irregular that its cross flow is piled up, but and again lamination put burning, make full use of the dischargeable capacity of calcining kiln, produce in batches.For guaranteeing to put the temperature uniformity that burns each hammer leaf, on the vertical periphery of the major axis both sides that fuse saggar 3, can have some grooves 4, constitute thermal trough.Fuse saggar and should bear high temperature sintering, can not be melted coating alloy again and soak into, can select refractory ceramics for use as Heat stability is goods such as Mullite porcelain, high-alumina ceramic, carborundum, boron nitride porcelain; Or can produce form compact and stable protective oxide layer on the surface, be difficult for being melted that alloy soaks into as titaniferous or contain aluminium or contain alloy of chromium etc.Above-mentioned material also can be suitable for making and fuse workpiece itself and do not have the container hold the alloyed powder position.
The coating hammer leaf is because all higher molten certainly composite alloy powder making coatings of employing hardness and toughness, the employing metallurgical junction gets togather, unlikely again generation " dilution " fuse technology, the clinkering hammer leaf has that the alloyed powder consumption is few, hardness is high and is even, the alloy wear-resisting performance is good, coating and matrix bond are firm, difficult drop-off.Because of the clinkering coating for adopting the controlled heat energy of enough concentrating; the instantaneous heating of high temperature; in very short time, make the coating alloy powder fusion that is coated on the matrix surface, soak into matrix, and that matrix remains is solid-state; therefore there is not " dilution " phenomenon; and under protective atmosphere or condition of negative pressure, heat, more can obtain soaking into well the coating of dense non-porous; technology controlling and process is convenient, and quality is easy to guarantee.Therefore can keep the original high hard antiwear characteristic of surperficial hardening agent preferably, hardness HRC on average can reach about 70, and coating and matrix can reach good metallurgical binding fully, make it to have higher binding strength.In addition, fused slurry coating hammer leaf unit are coating alloy consumption is few, and is little to hammer leaf matrix processing capacity, is not only applicable to new hammer leaf preparation, and is applicable to the reparation of old hammer leaf, overcome the defective that founding produced effectively.Has higher technical economic benefit.
Figure one is a coating hammer leaf schematic diagram.
Figure two is for fusing a kind of structural representation of saggar.
Embodiment: with No. 45 steel or A, steel is processed into the typing hammer leaf (also can be the old hammer leaf of wearing and tearing) of 150 * 50 * 5mm and two ends corner cut, derust (oxide), decontamination, behind the cleaning-drying, with composite alloy powder 25g,, be coated on hammer leaf two head working faces respectively with 35% rosin, the composite adhesive furnishing of 65% turpentine oil pasty state, after drying was repaiied type, lying against volume size was high-purity (＞97%) Al of 152 * 52 * 10mm
2O
3In the pottery saggar, have some thermal troughs on the saggar, be stacked in the fused slurry coating stove and fuse, be warming up to temperature requiredly,, promptly get required coating hammer leaf with the stove cooling.(table 3 is seen below)
That above-mentioned saggar can also be that other refractory ceramics or titaniferous or the alloy etc. that contains aluminium or contain chromium can produce on the surface is fine and close, stable protective oxide layer can not be melted the alloy that coating alloy soaks into.
Table 2 is used basic composite wear-resisting alloy coating formula (weight %) always
Coating trade mark WC% parent %
Ni
60+WC 25-45 Ni
6075-55
Co
50+WC 25-45 Co
5075-55
Fe
65+WC 25-45 Fe
6575-55
Table 1 common coatings alloyed powder parent prescription and chemical composition
Trade mark chemical composition (weight %)
C Cr B Si Ni Fe Co Mo
Ni
600.8-1.0 14-18 3.5-4.5 3.5-4.5 surplus≤14
Co
500.3-0.7 18-20 2.0-3.5 3.5-4.0 26-30≤12 surplus 4.0-6.0
Fe
654.5-5.0 35-50 2.5-3.0 2.0-3.0 surplus
Table 3 embodiment coating formula and fuse parameter
Group coating formula (weight %) vacuum (Pa) fusing sintering temperature (℃)
1 72Fe
65+28WC 2.0 1230
2 65Co
50+35WC 3.2 1180
3 60Ni
60+40WC 1.5 1160
4 32.5Ni
60+32.5Co
50+35WC 1.3 1170
Claims (6)
1, a kind of pulverizer coating hammer leaf comprises that steel substrate and clinkering have the head of tungsten carbide clinkering layer, it is characterized in that described clinkering layer is the tungsten carbide powder of 25-45%, the compound alloy coat that all the other are formed for self-fluxing powder.
2, by the described coating hammer leaf of claim 1, it is characterized in that said tungsten carbide powder content is 35%-40%.
3, a kind of manufacture method of pulverizer coating hammer leaf; it is characterized in that the hammer leaf matrix and apply being coated on head; granularity is the 140-320 order; contain the 25%-45% tungsten carbide powder, all the other are the compound alloyed powder of self-fluxing powder, lie against in the sintering saggar that can contain and coincide with the hammer leaf matrix; be flat in the calcining kiln then; under protective atmosphere or negative pressure, be warming up to 1050-1280 ℃ and make coating alloy liquid phase occur, cool off with stove.
4, by the manufacture method of the described coating hammer leaf of claim 3, it is characterized in that said hammer leaf matrix head is processed to blunt circle or approximate blunt round.
5, a kind of saggar that is used for the fused slurry coating hammer leaf is characterized in that described saggar made by the refractory ceramics of Heat stability is good or the alloy of titaniferous or aluminium or chromium.
6, by the described saggar of claim 5, it is characterized in that saggar major axis periphery has some thermal troughs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106981 CN1015609B (en) | 1989-06-02 | 1989-06-02 | Coated hammer sheet and its manufacture method and the box bowl for producing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106981 CN1015609B (en) | 1989-06-02 | 1989-06-02 | Coated hammer sheet and its manufacture method and the box bowl for producing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043455A CN1043455A (en) | 1990-07-04 |
| CN1015609B true CN1015609B (en) | 1992-02-26 |
Family
ID=4857001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106981 Expired CN1015609B (en) | 1989-06-02 | 1989-06-02 | Coated hammer sheet and its manufacture method and the box bowl for producing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015609B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626780A (en) * | 2012-03-23 | 2012-08-08 | 中国科学院金属研究所 | Biomass fuel forming mold surface powder metallurgy strengthening coating material and process |
| CN110449592A (en) * | 2019-09-17 | 2019-11-15 | 江苏金秆农业装备有限公司 | A kind of preparation method of manganese-boron steel wearing layer |
| CN115786791B (en) * | 2022-12-22 | 2024-02-13 | 杨冠华 | Mechanical crushing hammer and preparation process thereof |
-
1989
- 1989-06-02 CN CN 89106981 patent/CN1015609B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN1043455A (en) | 1990-07-04 |
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