CN102327795A - Chromium (Cr)-free high-boron iron-based wear-resistant duplex metal composite hammerhead and preparation method thereof - Google Patents
Chromium (Cr)-free high-boron iron-based wear-resistant duplex metal composite hammerhead and preparation method thereof Download PDFInfo
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- CN102327795A CN102327795A CN201110223208A CN201110223208A CN102327795A CN 102327795 A CN102327795 A CN 102327795A CN 201110223208 A CN201110223208 A CN 201110223208A CN 201110223208 A CN201110223208 A CN 201110223208A CN 102327795 A CN102327795 A CN 102327795A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000002905 metal composite material Substances 0.000 title claims abstract description 8
- 239000011651 chromium Substances 0.000 title abstract description 20
- 241000251131 Sphyrna Species 0.000 title abstract description 12
- 229910052804 chromium Inorganic materials 0.000 title abstract description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 11
- 239000010962 carbon steel Substances 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 39
- 239000010959 steel Substances 0.000 claims description 39
- 229910052796 boron Inorganic materials 0.000 claims description 27
- 239000002131 composite material Substances 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 5
- 238000005345 coagulation Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 239000003082 abrasive agent Substances 0.000 claims description 4
- 239000000956 alloy Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 229910001037 White iron Inorganic materials 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910000521 B alloy Inorganic materials 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 241000580063 Ipomopsis rubra Species 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010114 lost-foam casting Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a chromium (Cr)-free high-boron iron-based wear-resistant duplex metal composite hammerhead and a preparation method thereof, and belongs to the technical field of metal wear-resistant materials. In the preparation method, a Cr-free high-boron iron-based wear-resistant alloy is taken as a wear-resistant layer of the hammerhead, and carbon steel is taken as a toughened layer of the hammerhead. The preparation method comprises the following steps: firstly casting the upper and lower parts of a hammer handle (the toughened layer of the hammerhead), removing sand, grinding and acid-washing; then placing the obtained toughened layer of the hammerhead in a casting sand mould for preheating; and finally casting the wear-resistant layer of the hammerhead. In the hammerhead structure, the upper and lower parts of the hammer handle are designed into a closed integral structure, and the wear-resistant layer of the hammerhead envelops the toughened layer of the hammerhead, thus the Cr-free high-boron iron-based wear-resistant duplex metal composite hammerhead obtained by the preparation method has the advantages of better integral bonding property, long service life, low production cost and the like.
Description
Technical field
The present invention relates to the preparation method of the bimetallic composite hammer head of high ferro-boron based wear-resistant alloy of a kind of Cr of nothing and carbon steel, belong to metal wear resistant material and make the field.
Background technology
Because boron is abundant at China's reserves, and is cheap, adds element for boron as alloy and can reduce cost undoubtedly.Thereby for the casting iron-base alloy of boron as main alloy element, its research enjoys domestic and international concern, and the former Soviet Union, Japan, Australian scholar and Chinese scholar have successively carried out certain research.
The Guo Changqing of China, symbol pallid light, Liu Zhongli have carried out the Fe-C-B correlative study that contains Cr successively, and have carried out practical applications.The result shows that in the Fe-Cr-B alloy, boron is with the Fe of high rigidity, high stability
2The B form exists, and control carbon boron ratio and suitable Technology for Heating Processing can obtain higher hardness and impact flexibility, and shock resistance abrasive wear performance and rich chromium cast iron are suitable, are 4 times of potassium steel.To add Cr be prerequisite but these researchs all are based on.
Patent CN86106682A discloses the bimetal composite casting method of a kind of white cast-iron and cast steel; " castingin " and " biliquid " two kinds of composite casting technology methods of employing; Combine the position protective agent through homemade SIV bimetallic, both protected the cleaning under the binding site high temperature, prevent high-temperature oxydation; And impel the heat exchange of two kinds of materials, be convenient to bimetallic strong bonded.The integral coherence of the bimetal composite casting of this technology is good, and the part of producing has good wear resistence, hear resistance, corrosion resistance.But owing to adopt white cast-iron as wearing layer; Need with carbide or chromium carbide as wild phase, and need to add Cr, Mo, V alloy element, along with rising steadily of these element prices; Its cost also constantly increases, and has limited it and has used widely in wear-resisting field.
Patent CN2123371U discloses a kind of by hammer mill bimetallic composite hammer head dimerous up and down; Adopt potassium steel, medium managese steel or ordinary carbon steel material top as the bimetallic composite hammer head; With the bottom of high-abrasive material (like rich chromium cast iron), and leave dovetail groove and be convenient to the tup upper and lower part and cooperate as tup.This bimetallic is compound need to be main alloy element with Cr or Mn not only, and under the dovetail groove condition of contact, the impact resistance of tup is poor, occurs fracture easily at the dovetail groove binding site.
Patent CN2291972Y discloses a kind of bimetallic composite hammer head; Form by steel alloy tup and wear-resisting cylindrical rod (rich chromium cast iron, carbide alloy, general white cast-iron, low chromium white cast iron etc.); Adopt lost foam casting, can reach good metallurgical binding.But, limited its wearability because abrasion-proof stick is less in the volume ratio at tup place.
Patent CN101239380A discloses a kind of production technique method of bimetal composite casting board hammer; As wearing layer, solved the problem that rich chromium cast iron is difficult for processing or welding with the bimetal composite casting piece of rich chromium cast iron and cast steel, hammer handle is low-alloy steel (or alloy cast steel); Then through weld, be threaded, dovetail combination is connected as a single entity; Reduced production cost, but manufacture craft is complicated, the binding ability of hammer handle and composite casting piece is general.
It is thus clear that the wearing layer of present castingin composite wear-resistant hammerhead is main with rich chromium cast iron mostly, ubiquity production cost problem of higher; And make wear-resistant hammer head with potassium steel, impact resistance is poor, can only in heavily stressed impact occasion, use.The existence of these problems makes the range of application of prior art receive very big restriction.Utilize imbedding process, adopt no Cr high ferro-boron base alloy and carbon steel bimetallic compound, the technology that reduces production costs is not appeared in the newspapers.
Summary of the invention
The object of the invention provides a kind of bimetallic composite hammer head and preparation method thereof, with the high ferro-boron based wear-resistant alloy of no Cr as tup wearing layer, carbon steel as the tup ductile layers, reduce the production cost of bimetallic composite hammer head.
Bimetallic composite hammer head of the present invention is made up of hammer handle top, hammer handle bottom and tup wearing layer, and the hammer handle upper and lower part is the tup ductile layers; Outer is wearing layer (covering on the ductile layers), and the tup ductile layers is a carbon steel, and tup wearing layer chemical component weight percentage is: C 0.3～1.0%; B 1.0～4.5%, and Si 0.3～0.4%, and Mn 0.2～0.4%; S＜0.05%, P＜0.05%, all the other are Fe.
The present invention realizes that the technical scheme that above-mentioned order is taked is: with carbon steel cast tup ductile layers, the high ferro-boron base high-abrasive material of the no Cr of cast is as the tup wearing layer then earlier.The concrete preparation process of the present invention is following:
(1) preparation tup ductile layers: put into the smelting furnace melting as raw material with steel scrap; Control molten steel chemical composition in carbon steel phosphorus content 0.35%～0.55% scope, treat molten steel molten clear after, the Al that adds molten steel weight 0.1～0.3% carries out deoxidation; Come out of the stove at 1540 ℃～1580 ℃ after skimming; The ductile layers part of cast tup, after the ductile layers of treating tup is cooled off naturally, sand removal, polishing, binding site surface acid-washing.
(2) the tup ductile layers that step (1) is obtained (hammer handle upper and lower part) is put into the tup casting sand type, carries out preheating, and preheat temperature is 300 ℃～350 ℃.
(3) preparation tup wearing layer: steel scrap is put into the smelting furnace melting; Treat that the molten clear back of molten steel adds ferro-boron and continues melting, control its chemical component weight percentage and be: C 0.3～1.0%, B 1.0～4.5%, Si 0.3～0.4%, Mn 0.2～0.4%, S＜0.05%, P＜0.05%, all the other are Fe; Temperature rises to 1550 ℃～1600 ℃, adds the pure Al deoxidation of molten steel weight 0.1～0.3%, comes out of the stove after skimming; Leave standstill after coming out of the stove and naturally cool to 1450 ℃～1500 ℃, again with pouring metal melt to the sand mold of putting into hammer handle, make molten metal coagulation forming in die cavity, the tup ductile layers is wrapped in wherein, form the bimetallic composite hammer head.
The control of each constituent content such as said carbon adopts conventional method to carry out.As, the control of carbon content is carried out through the method that adds the pig iron or mild steel.
The present invention compared with prior art has following characteristics:
(1) the hammer handle upper and lower part is designed to integrally closedly in the hammehead structure, is convenient to combine with wearing layer better; Tup wearing layer envelope ductile layers can increase tup service life.
(2) China's boron element reserves are abundant, and are cheap, replace alloying elements cr that price skyrockets, Mo, Ni, V etc. to prepare high-abrasive material with the B element, will reduce cost greatly;
(3) production technology is simple, and is easy to utilize.
Description of drawings
In the accompanying drawing 1,1-hammer handle top, 2-hammer handle bottom, 3-tup wearing layer (tup is outer).1,2 is the tup ductile layers.
The specific embodiment
Embodiment 1:
(1) preparation tup ductile layers: put into the intermediate frequency furnace melting as raw material with steel scrap; Detecting the molten steel phosphorus content is 0.2%, and adding pig iron adjustment molten steel chemical composition is phosphorus content 0.35%, fusion clear after; Add molten steel weight 0.1% the Al deoxidation, skim the back come out of the stove at 1540 ℃; The cast hammer handle upper and lower part (tup ductile layers) of coming out of the stove then, treat that it cools off naturally after, sand removal, polishing, binding site surface acid-washing.
(2) the tup ductile layers that step (1) is obtained (hammer handle upper and lower part) is put into the tup casting sand type, carries out preheating, and preheat temperature is 300 ℃.
(3) preparation tup wearing layer: steel scrap is put into the intermediate frequency furnace melting; Treat that the molten clear back of molten steel adds ferro-boron and continues melting; Use its chemical composition of conventional method control molten steel to be C 0.3%, B 4.5%, Si 0.4%, Mn:0.2%, S 0.03%; P 0.01%, and all the other are Fe (percentage by weight).Temperature rises to 1550 ℃, adds the Al deoxidation of molten steel weight 0.1%, comes out of the stove after skimming; Leave standstill after coming out of the stove and naturally cool to 1450 ℃, again with pouring metal melt to the sand mold of putting into hammer handle, make molten metal in die cavity with coagulation forming, the tup ductile layers is wrapped in wherein, form the bimetallic composite hammer head.
Embodiment 2:
(1) preparation tup ductile layers: put into the intermediate frequency furnace melting as raw material with steel scrap; Detecting the molten steel phosphorus content is 0.45%, fusion clear after, add the Al deoxidation of molten steel weight 0.2%, come out of the stove at 1560 ℃ in the back of skimming; The cast hammer handle upper and lower part (tup ductile layers) of coming out of the stove then, treat that it cools off naturally after, sand removal, polishing, binding site surface acid-washing.
(2) the tup ductile layers that step (1) is obtained (hammer handle upper and lower part) is put into the tup casting sand type, carries out preheating, and preheat temperature is 320 ℃.
(3) preparation tup wearing layer: the steel scrap and the pig iron are put into the intermediate frequency furnace melting; Treat that the molten clear back of molten steel adds ferro-boron and continues melting; Use conventional method control molten steel chemical composition to be C 0.7%, B 2.1%, Si 0.2%, Mn:0.4%, S 0.04%; P 0.04%, and all the other are Fe (percentage by weight).Temperature rises to 1570 ℃, adds the Al deoxidation of molten steel weight 0.2%, comes out of the stove after skimming; Leave standstill after coming out of the stove and naturally cool to 1470 ℃, again with pouring metal melt to the sand mold of putting into hammer handle, make molten metal in die cavity with coagulation forming, the tup ductile layers is wrapped in wherein, form the bimetallic composite hammer head.
Embodiment 3:
(1) preparation tup ductile layers: put into the intermediate frequency furnace melting as raw material with steel scrap; Detecting the molten steel phosphorus content is 0.65%, and adding mild steel adjustment carbon content is 0.55%, fusion clear after; Add molten steel weight 0.3% the Al deoxidation, skim the back come out of the stove at 1580 ℃; The cast hammer handle upper and lower part (tup ductile layers) of coming out of the stove then, treat that it cools off naturally after, sand removal, polishing, binding site surface acid-washing.
(2) the tup ductile layers that step (1) is obtained (hammer handle upper and lower part) is put into the tup casting sand type, carries out preheating, and preheat temperature is 350 ℃.
(3) preparation tup wearing layer: steel scrap is put into the intermediate frequency furnace melting; Treat that the molten clear back of molten steel adds ferro-boron and continues melting; Use conventional method control chemical composition to be C 1.0%, B 1.0%, Si 0.3%, Mn:0.3%, S 0.04%, P 0.03%, and all the other are Fe (percentage by weight).Temperature rises to 1600 ℃, adds the Al deoxidation of molten steel weight 0.3%, comes out of the stove after skimming; Leave standstill after coming out of the stove and naturally cool to 1500 ℃, again with pouring metal melt to the sand mold of putting into hammer handle, make molten metal in die cavity with coagulation forming, the tup ductile layers is wrapped in wherein, form the bimetallic composite hammer head.
Claims (4)
1. the high ferro-boron base of no Cr abrasion-proof duplex metal composite hammer head; It is characterized in that: form by hammer handle top, hammer handle bottom and tup are outer, the hammer handle upper and lower part is the tup ductile layers, and the tup skin is as wearing layer; The tup ductile layers is a carbon steel, and the tup wearing layer is the high ferro-boron base of a no Cr high-abrasive material.
2. the high ferro-boron base of no Cr according to claim 1 abrasion-proof duplex metal composite hammer head; It is characterized in that: the chemical component weight percentage of the high ferro-boron base of no Cr wearing layer is: C 0.3～1.0%, and B 1.0～4.5%, and Si 0.3～0.4%; Mn 0.2～0.4%; S＜0.05%, P＜0.05%, all the other are Fe.
3. a preparation method who does not have the high ferro-boron base of Cr abrasion-proof duplex metal composite hammer head is characterized in that: pour into a mould tup carbon steel ductile layers earlier, outside the tup ductile layers, pour into a mould the high ferro-boron base of no Cr wearing layer then, obtain the bimetallic composite hammer head.
4. the preparation method of the high ferro-boron base of no Cr according to claim 3 abrasion-proof duplex metal composite hammer head, it is characterized in that: concrete preparation process is following:
(1) preparation tup ductile layers: put into the smelting furnace melting as raw material with steel scrap; Control molten steel chemical composition in carbon steel phosphorus content 0.35%～0.55% scope, treat molten steel molten clear after, carry out deoxidation with the Al of molten steel weight 0.1～0.3%; Come out of the stove at 1540 ℃～1580 ℃ after skimming; The ductile layers part of cast tup, treat that tup ductile layers part is cooled off naturally after, sand removal, polishing, binding site surface acid-washing;
(2) the tup casting sand type is put in the hammer handle upper and lower part that step (1) is obtained (tup ductile layers), carries out preheating, and preheat temperature is 300 ℃～350 ℃;
(3) preparation tup wearing layer: steel scrap is put into the smelting furnace melting; Treat that the molten clear back of molten steel adds ferro-boron and continues melting, control its chemical component weight percentage and be: C 0.3～1.0%, B 1.0～4.5%, Si 0.3～0.4%, Mn 0.2～0.4%, S＜0.05%, P＜0.05%, all the other are Fe; Temperature rises to 1550 ℃～1600 ℃, and the Al that adds molten steel weight 0.1～0.3% carries out deoxidation, comes out of the stove after skimming; Leave standstill after coming out of the stove and naturally cool to 1450 ℃～1500 ℃, again with pouring metal melt to the sand mold of putting into hammer handle, make molten metal coagulation forming in die cavity, with tup internal toughness layer envelope therein, form the bimetallic composite hammer head.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110223208A CN102327795A (en) | 2011-08-05 | 2011-08-05 | Chromium (Cr)-free high-boron iron-based wear-resistant duplex metal composite hammerhead and preparation method thereof |
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| CN201110223208A CN102327795A (en) | 2011-08-05 | 2011-08-05 | Chromium (Cr)-free high-boron iron-based wear-resistant duplex metal composite hammerhead and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182478A (en) * | 2013-03-24 | 2013-07-03 | 佳木斯大学 | Bi-metal hammer head and casting process thereof |
| CN105537566A (en) * | 2016-02-02 | 2016-05-04 | 天津雅枫科技有限公司 | Crusher hammerhead and casting technological process thereof |
| WO2024107130A1 (en) * | 2022-11-19 | 2024-05-23 | Sezgin Celik Dokum Mak. Iml. San. Taah. San. Tic. Ltd. Sti. | Stone shredder crusher hammer for stone crushing and grinding machines |
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|---|---|---|---|---|
| EP0240440A2 (en) * | 1986-03-18 | 1987-10-07 | FONDERIES ET ACIERIES ELECTRIQUES DE FEURS S.A. Société Anonyme | Hammer, especially for machines for grinding scrap or other metals |
| CN2657775Y (en) * | 2003-11-27 | 2004-11-24 | 武汉智科耐磨材料科技发展有限公司 | Bimetal composite casting abrasion-resistant hammerhead |
| CN201211484Y (en) * | 2008-04-30 | 2009-03-25 | 昆明理工大学 | Double-metal combined beater head |
| CN101934242A (en) * | 2010-09-26 | 2011-01-05 | 郑州海特机械有限公司 | Combined hammer head and manufacturing process thereof |
| CN201711180U (en) * | 2010-07-06 | 2011-01-19 | 张映霞 | Bimetal composite hammer |
| CN101979695A (en) * | 2010-11-17 | 2011-02-23 | 昆明理工大学 | Chromium-free high boron iron-based casting alloy and preparation method |
-
2011
- 2011-08-05 CN CN201110223208A patent/CN102327795A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0240440A2 (en) * | 1986-03-18 | 1987-10-07 | FONDERIES ET ACIERIES ELECTRIQUES DE FEURS S.A. Société Anonyme | Hammer, especially for machines for grinding scrap or other metals |
| CN2657775Y (en) * | 2003-11-27 | 2004-11-24 | 武汉智科耐磨材料科技发展有限公司 | Bimetal composite casting abrasion-resistant hammerhead |
| CN201211484Y (en) * | 2008-04-30 | 2009-03-25 | 昆明理工大学 | Double-metal combined beater head |
| CN201711180U (en) * | 2010-07-06 | 2011-01-19 | 张映霞 | Bimetal composite hammer |
| CN101934242A (en) * | 2010-09-26 | 2011-01-05 | 郑州海特机械有限公司 | Combined hammer head and manufacturing process thereof |
| CN101979695A (en) * | 2010-11-17 | 2011-02-23 | 昆明理工大学 | Chromium-free high boron iron-based casting alloy and preparation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182478A (en) * | 2013-03-24 | 2013-07-03 | 佳木斯大学 | Bi-metal hammer head and casting process thereof |
| CN105537566A (en) * | 2016-02-02 | 2016-05-04 | 天津雅枫科技有限公司 | Crusher hammerhead and casting technological process thereof |
| WO2024107130A1 (en) * | 2022-11-19 | 2024-05-23 | Sezgin Celik Dokum Mak. Iml. San. Taah. San. Tic. Ltd. Sti. | Stone shredder crusher hammer for stone crushing and grinding machines |
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Application publication date: 20120125 |