CN105463300A - Method for manufacturing isothermally-quenched spheroidal graphite cast iron hammer - Google Patents
Method for manufacturing isothermally-quenched spheroidal graphite cast iron hammer Download PDFInfo
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- CN105463300A CN105463300A CN201510875217.1A CN201510875217A CN105463300A CN 105463300 A CN105463300 A CN 105463300A CN 201510875217 A CN201510875217 A CN 201510875217A CN 105463300 A CN105463300 A CN 105463300A
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- Prior art keywords
- chromium
- carbon
- tup
- aluminium alloy
- temperature
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
Abstract
The invention discloses a method for manufacturing an isothermally-quenched spheroidal graphite cast iron hammer. The method includes the steps that raw materials are placed in a smelting furnace to increase the temperature till the raw materials are in the melted state, hardening and tempering are performed, the raw materials are delivered out of the furnace, and molten alloy is obtained, wherein the raw materials comprise, by weight percentage, 3.73% to 3.78% of carbon, 2.62% to 2.65% of silicon, 0.22% to 0.25% of manganese, 0.50% to 0.55% of chromium, 0.21% to 0.24% of molybdenum, 0.57% to 0.60% of copper, 0.33% to 0.35% of nickel, not larger than 0.05% of phosphorus, not larger than 0.03% of sulfur and the balance iron; the molten alloy is cast into a hammer blank; and the temperature of the hammer blank is increased, the hammer blank is austenitized, the temperature is kept, isothermal quenching is performed, and therefore the isothermally-quenched spheroidal graphite cast iron hammer is obtained, wherein the austenitizing temperature satisfying the formula of T<1>=920+K<1>*(n carbon/n chromium), the isothermal quenching temperature satisfying the formula of T<2>=230+K<2>*(n carbon/n chromium), K<1> ranges from 2 to 4, and K<2> ranges from 5 to 7.
Description
Technical field
The present invention relates to hammer mill technical field, particularly relate to a kind of preparation method of austempering ductile iron tup.
Background technology
Hammer mill widely uses at brick field and coal gangue source mill, and tup stands impact and the wearing and tearing of material in high-speed rotation, is its main abrasion piece.The tup that present brick field more often uses has high mangaenese steel tup, rich chromium cast iron tup and Double-metal composite hammer.But various material tup all has some limitations.High mangaenese steel is organized as single phase austenite after water-tenacity treatment, and under the repeated action of intense impact, extrusion load, have the feature of work hardening, and impact energy is larger, hardening effect is better.If but drawing hardening effect is insufficient, surface hardness is just on the low side, and its wear resistance is just poor.Its hardness of the residual body of high manganese hammer after coal gangue source mill uses only has HRC28-32, and obvious work hardening is not enough, directly affects the work-ing life of tup.Rich chromium cast iron matrix is primarily of martensite and carbide composition, and have good hardness and wear resistance, but toughness is lower, its ak value is at 3 ~ 5J/cm
2.It is easily cracked that it runs into harder material (as stone, scum etc.) in the process of fragmentation.Compound casting tup result of use is better, but on the high side, and cost performance is improper.
Therefore, now developing a kind of neither broken tup wear-resisting being again suitable for using at brick field and coal gangue source mill is current urgent problem.
Summary of the invention
Based on the technical problem that background technology exists, the present invention proposes a kind of preparation method of austempering ductile iron tup, gained cast iron tup has higher initial hardness and suitable impelling strength, hardness can reach HRC53, ballistic work can reach 34.8J, the shortcoming of high mangaenese steel and rich chromium cast iron tup can be made up with not enough, realistic Production requirement.
The preparation method of a kind of austempering ductile iron tup that the present invention proposes, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.73 ~ 3.78%, silicon: 2.62 ~ 2.65%, manganese: 0.22 ~ 0.25%, chromium: 0.50 ~ 0.55%, molybdenum: 0.21 ~ 0.24%, copper: 0.57 ~ 0.60%, nickel: 0.33 ~ 0.35%, phosphorus :≤0.05%, sulphur :≤0.03%, all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature >=1350 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated, isothermal quenching obtains austempering ductile iron tup; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 2 ~ 4, K
2value be 5 ~ 7, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
Preferably, in the aluminium alloy of S1, the weight ratio of manganese, copper and mickel is 0.23 ~ 0.24:0.58 ~ 0.59:0.335 ~ 0.345.
Preferably, in the aluminium alloy of S1, the weight ratio of chromium and molybdenum is 0.52 ~ 0.53:0.22 ~ 0.23.
Preferably, in S1, the compositions in weight percentage of aluminium alloy comprises: carbon: 3.74 ~ 3.76%, silicon: 2.63 ~ 2.64%, manganese: 0.23 ~ 0.24%, chromium: 0.52 ~ 0.53%, molybdenum: 0.22 ~ 0.23%, copper: 0.58 ~ 0.59%, nickel: 0.335 ~ 0.345%, phosphorus :≤0.05%, sulphur :≤0.03%, all the other are iron.
Preferably, in S3, soaking time is 2.4 ~ 2.8h.
Preferably, in S3, isothermal quenching time is 4.5 ~ 5h.
In the present invention, each element interaction is as follows:
Carbon: as the principal element forming graphite pebbles, effectively can control graphite number and graphite size, simultaneously, suitable carbon equivalent can make iron liquid be easy to flowing, increases the cavity filling ability of iron liquid, reduces Shrinkage cavity, improve the compactness of foundry goods, but carbon content is too high, easily produce graphite floatation, affect the performance of cast iron.
Silicon: promote graphited element as strong, the effect bred can be played again.Higher silicon content has very large benefit to the cast of foundry goods and from feeding.Silicone content is high, and to being formed, globular graphite is favourable, but silicone content more than 3.0% time, impelling strength can sharply reduce.
Manganese: can expand austenitic area, enhances austenitic stability; Be solid-solubilized in matrix and carbide, can matrix be strengthened, improve hardness, improve the hardening capacity of matrix.But higher manganese content can cause coarse grains, and the border being very easily enriched to eutectic cell forms perlite or carbide.Time serious, carbide is formed netted, greatly have impact on the toughness of material.Because tup requires to have higher toughness, so should control Fe content.
Chromium: can improve hardening capacity is carbide forming element simultaneously, and in spheroidal graphite cast iron, it can generate M with carbon
3c type carbide as effective Hard Inclusion Dispersed precipitate on matrix, can improve hardness and the fastness to rubbing of material.Find to confirm through test: containing Cr0.5%, carbide accounts for 15 ~ 20%, practical requirement.
Molybdenum: the hardening capacity that strongly can improve material.After adding molybdenum, austenite is obstructed to perlitic transformation, and reduces pearlitic critical temperature, carries out isothermal quenching at a lower temperature, can be relatively easy to obtain ferritic structure.On the other hand, molybdenum is the positive segregation element that partition ratio is lower, be 0.39%, therefore the interpolation of molybdenum should control below 0.4% at austenite center content, and with copper, nickel with the use of.
Copper: can expand austenite phase field, improves graphite pebbles shape and increases graphite pebbles number.Having good hardening capacity, is negative segregation element, brings negative impact when iron liquid can weaken when eutectic point solidifies by the positive segregation of molybdenum, manganese, reduces white-bright zone, promotes the homogenizing of tissue.
Nickel: effectively can expand austenite phase field, improves stabilization of austenite, has good hardening capacity, so obviously can improve the mechanical property of matrix simultaneously.
The present invention adopts carbide-containing austempering ductile iron to prepare tup, and it is as a kind of excellent mechanical engineering material, has that hardness is high, good toughness, the lightweight and feature such as flat, damping, can make up the shortcoming of high mangaenese steel and rich chromium cast iron tup with not enough.And thermal treatment process is very large on the impact of the structure and properties of carbide-containing austempering ductile iron, different austenitizing conditions and isothermal parameters, all can produce obvious performance difference.
Due to coal gangue lower hardness, and it is more crisp, in the process of hammer crushing crusher machine, surging force is less, the work hardening capacity of the preparation method of austempering ductile iron tup lower than carbide-containing austempering ductile iron abrading-ball, therefore should ensure after preparation method's thermal treatment of austempering ductile iron tup that it has higher initial hardness and suitable impelling strength.
And carbide-containing austempering ductile iron is in recent years by the derivative a kind of novel ductile iron material of austempering ductile iron.The basis of austempering ductile iron adds strong carbide, makes Dispersed precipitate in bainite+austenitic matrix M
3c type chromium carbide.When austenitizing temperature is higher, when in austenite, carbon content is higher, austenite is more stable, there is in final tissue more high-carbon residual austenite, when isothermal temperature is higher, austenite is not easily transformed into acicular ferrite and martensite, also makes to have more high-carbon residual austenite in final tissue; And austenite structure can improve the impelling strength of material, but the hardness of material can be reduced; In heat treatment process, impelling strength and scale of hardness reveal vie each other, the process of dynamic change, therefore, according to alloying constituent adjustment heat treating regime, the relation of balance-impact toughness and hardness becomes the key obtaining good over-all properties; In the present invention, the soaking time of austenitizing temperature, austempering temperature, austenitizing time, isothermal quenching is considered by entirety, disclose the relation between four processing parameters, by considering four processing parameters, optimize system of heat treatment process, make material have good over-all properties.Hardness of the present invention can reach HRC53, and ballistic work can reach 34.8J, realistic Production requirement.
Embodiment
Below, by specific embodiment, technical scheme of the present invention is described in detail.
Embodiment 1
The preparation method of a kind of austempering ductile iron tup that the present invention proposes, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.73%, silicon: 2.65%, manganese: 0.22%, chromium: 0.55%, molybdenum: 0.21%, copper: 0.60%, nickel: 0.33%, phosphorus :≤0.05%, sulphur :≤0.03%, and all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature is 1370 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated 2.8h, isothermal quenching obtains austempering ductile iron tup, and isothermal quenching time is 4.5h; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 4, austenitizing temperature is 947 DEG C, K
2value be 5, austempering temperature is 264 DEG C, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
Embodiment 2
The preparation method of a kind of austempering ductile iron tup that the present invention proposes, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.78%, silicon: 2.62%, manganese: 0.25%, chromium: 0.50%, molybdenum: 0.24%, copper: 0.57%, nickel: 0.35%, phosphorus :≤0.05%, sulphur :≤0.03%, and all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature is 1360 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated 2.4h, isothermal quenching obtains austempering ductile iron tup, and isothermal quenching time is 5h; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 2, austenitizing temperature is 935 DEG C, K
2value be 7, austempering temperature is 283 DEG C, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
Embodiment 3
The preparation method of a kind of austempering ductile iron tup that the present invention proposes, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.74%, silicon: 2.64%, manganese: 0.23%, chromium: 0.53%, molybdenum: 0.22%, copper: 0.59%, nickel: 0.335%, phosphorus :≤0.05%, sulphur :≤0.03%, and all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature is 1380 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated 2.6h, isothermal quenching obtains austempering ductile iron tup, and isothermal quenching time is 4.6h; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 3.5, austenitizing temperature is 945 DEG C, K
2value be 5.5, austempering temperature is 267 DEG C, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
Embodiment 4
The preparation method of a kind of austempering ductile iron tup that the present invention proposes, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.76%, silicon: 2.63%, manganese: 0.24%, chromium: 0.52%, molybdenum: 0.23%, copper: 0.58%, nickel: 0.345%, phosphorus :≤0.05%, sulphur :≤0.03%, and all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature is 1350 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated 2.5h, isothermal quenching obtains austempering ductile iron tup, and isothermal quenching time is 4.8h; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 2.5, austenitizing temperature is 938 DEG C, K
2value be 6.5, austempering temperature is 277 DEG C, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (6)
1. a preparation method for austempering ductile iron tup, is characterized in that, comprises the steps:
S1, melting: raw material is placed in smelting furnace and is warming up to molten state, modified, come out of the stove and obtain aluminium alloy; Wherein the compositions in weight percentage of aluminium alloy comprises: carbon: 3.73 ~ 3.78%, silicon: 2.62 ~ 2.65%, manganese: 0.22 ~ 0.25%, chromium: 0.50 ~ 0.55%, molybdenum: 0.21 ~ 0.24%, copper: 0.57 ~ 0.60%, nickel: 0.33 ~ 0.35%, phosphorus :≤0.05%, sulphur :≤0.03%, all the other are iron;
S2, cast: aluminium alloy is carried out cast and obtains tup base substrate, teeming temperature >=1350 DEG C;
S3, thermal treatment: heated up by tup base substrate and carry out austenitizing, be then incubated, isothermal quenching obtains austempering ductile iron tup; Austenitizing temperature T
1=920+K
1× (n
carbon/ n
chromium), austempering temperature T
2=230+K
2× (n
carbon/ n
chromium), wherein K
1value be 2 ~ 4, K
2value be 5 ~ 7, n
carbonand n
chromiumbe respectively weight percent shared by carbon and chromium element in aluminium alloy.
2. the preparation method of austempering ductile iron tup according to claim 1, it is characterized in that, in the aluminium alloy of S1, the weight ratio of manganese, copper and mickel is 0.23 ~ 0.24:0.58 ~ 0.59:0.335 ~ 0.345.
3. the preparation method of austempering ductile iron tup according to claim 1 or 2, it is characterized in that, in the aluminium alloy of S1, the weight ratio of chromium and molybdenum is 0.52 ~ 0.53:0.22 ~ 0.23.
4. the preparation method of austempering ductile iron tup according to any one of claim 1-3, is characterized in that, in S1, the compositions in weight percentage of aluminium alloy comprises: carbon: 3.74 ~ 3.76%, silicon: 2.63 ~ 2.64%, manganese: 0.23 ~ 0.24%, chromium: 0.52 ~ 0.53%, molybdenum: 0.22 ~ 0.23%, copper: 0.58 ~ 0.59%, nickel: 0.335 ~ 0.345%, phosphorus :≤0.05%, sulphur :≤0.03%, all the other are iron.
5. the preparation method of austempering ductile iron tup according to any one of claim 1-4, it is characterized in that, in S3, soaking time is 2.4 ~ 2.8h.
6. the preparation method of austempering ductile iron tup according to any one of claim 1-5, it is characterized in that, in S3, isothermal quenching time is 4.5 ~ 5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510875217.1A CN105463300A (en) | 2015-11-30 | 2015-11-30 | Method for manufacturing isothermally-quenched spheroidal graphite cast iron hammer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510875217.1A CN105463300A (en) | 2015-11-30 | 2015-11-30 | Method for manufacturing isothermally-quenched spheroidal graphite cast iron hammer |
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|---|---|
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Family
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109530819A (en) * | 2018-10-10 | 2019-03-29 | 无锡市恒翼通机械有限公司 | The manufacturing method of harmonic wave speed reducing machine firm gear |
| CN110257728A (en) * | 2019-06-21 | 2019-09-20 | 宁国市正兴耐磨材料有限公司 | A kind of corrosion-resistant grinder hammerhead and preparation method thereof |
| CN114804671A (en) * | 2022-04-28 | 2022-07-29 | 中国恩菲工程技术有限公司 | Method for preparing nodular cast iron grinding ball from iron-rich nickel slag and preparing cementing material in cooperation with nodular cast iron grinding ball |
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| JPS60184659A (en) * | 1984-03-02 | 1985-09-20 | Toyota Motor Corp | Spheroidal graphite cast iron having high strength and toughness |
| JP2007270195A (en) * | 2006-03-30 | 2007-10-18 | Komatsu Ltd | Method for producing spheroidal graphite cast-iron article, and spheroidal graphite cast-iron article |
| JP2011236493A (en) * | 2010-04-13 | 2011-11-24 | Keylex Corp | Press forming mold made of spherical graphite cast iron and method of manufacturing the same |
| CN103131937A (en) * | 2013-01-28 | 2013-06-05 | 天津万立鑫晟新材料技术研究院有限公司 | Carbide-containing isothermal quenching nodular cast iron and preparation method thereof |
| CN105018833A (en) * | 2015-07-09 | 2015-11-04 | 王波林 | Isothermal quenching ductile cast iron and method for producing end of propelling rod through isothermal quenching ductile cast iron |
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2015
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| JPS60184659A (en) * | 1984-03-02 | 1985-09-20 | Toyota Motor Corp | Spheroidal graphite cast iron having high strength and toughness |
| JP2007270195A (en) * | 2006-03-30 | 2007-10-18 | Komatsu Ltd | Method for producing spheroidal graphite cast-iron article, and spheroidal graphite cast-iron article |
| JP2011236493A (en) * | 2010-04-13 | 2011-11-24 | Keylex Corp | Press forming mold made of spherical graphite cast iron and method of manufacturing the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109530819A (en) * | 2018-10-10 | 2019-03-29 | 无锡市恒翼通机械有限公司 | The manufacturing method of harmonic wave speed reducing machine firm gear |
| CN110257728A (en) * | 2019-06-21 | 2019-09-20 | 宁国市正兴耐磨材料有限公司 | A kind of corrosion-resistant grinder hammerhead and preparation method thereof |
| CN114804671A (en) * | 2022-04-28 | 2022-07-29 | 中国恩菲工程技术有限公司 | Method for preparing nodular cast iron grinding ball from iron-rich nickel slag and preparing cementing material in cooperation with nodular cast iron grinding ball |
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