CN104549651A - Electroslag smelting casting combined welding type dual-metal wear-resistant hammer head and manufacturing method thereof - Google Patents
Electroslag smelting casting combined welding type dual-metal wear-resistant hammer head and manufacturing method thereof Download PDFInfo
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- CN104549651A CN104549651A CN201410827842.4A CN201410827842A CN104549651A CN 104549651 A CN104549651 A CN 104549651A CN 201410827842 A CN201410827842 A CN 201410827842A CN 104549651 A CN104549651 A CN 104549651A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses an electroslag smelting casting combined welding type dual-metal wear-resistant hammer head and a manufacturing method thereof. The dual-metal wear-resistant hammer head comprises a medium-carbon or low-carbon cast steel hammer body, wherein recesses are formed in the middle upper parts of two sides of the hammer body and have the depths of 50-60 mm; medium-carbon or low-carbon medium-chromium alloy steel wear-resistant blocks or dual-metal wear-resistant blocks are embedded and welded at the recesses; the dual-metal wear-resistant blocks comprise low-carbon cast steel layers and high-chromium cast iron surface layers, which are compounded through electroslag smelting casting; a high-vanadium high-speed steel wear-resistant head formed by compounding through electroslag smelting casting is arranged at the top end of the hammer body. The dual-metal wear-resistant hammer head is safe to use, good in wear resistance, long in service life and high in cost performance; the wear resistance of a wear-resistant layer of the hammer head is more than 6 times that of forged and alloy steel hammer heads and more than 3 times that of carbon steel and high-chromium cast iron dual-metal hammer heads.
Description
Technical field
The present invention relates to the combined and welded bimetal wear resistant tup of a kind of Wear-proof hammer for crusher, particularly electroslag smelting casting and manufacture method thereof.
Background technology
At present, pulverize all kinds of ore, the wearing piece that rock type disintegrating machine mainly consumes is that one side hits tup, and this tup mainly contains in forging tup, casting at present, the bimetal hammerhead of low-carbon abrasion resistant steel alloy tup, rich chromium cast iron, carbon steel compound.The tup low cost of manufacture of forging, but wear no resistance, service life is short.Middle carbon or low-carbon abrasion resistant steel alloy price moderate, wearability is poor, and service life is shorter.The bimetal hammerhead of rich chromium cast iron, carbon steel compound, hammer handle part is middle carbon or low-carbon cast steel, tup part is rich chromium cast iron, the relative good product of each side index in this three series products, but poor stability, hammer handle in use premature failure, cost performance be low etc. that shortcoming still makes it apply is limited.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of use safety, wearability is good, long service life, cost performance the are high combined and welded bimetal wear resistant tup of electroslag smelting casting and manufacture method thereof, the wearability of this tup wearing layer is more than 6 times of forging and steel alloy tup, carbon steel, rich chromium cast iron bimetal hammerhead more than 3 times.
Technical solution of the present invention is:
Combined and welded bimetal wear resistant tup, comprise middle carbon or low-carbon cast steel hammer body, hammer middle and upper part, body both sides is provided with notch, the degree of depth of described notch is 50mm-60mm, chromium alloyed steel wear-resistant block or bimetal wear resistant block in carbon or low-carbon (LC) at notch place insert and in being welded with, described bimetal wear resistant block forms by through electroslag smelting casting composite low-carbon cast steel layer and rich chromium cast iron top layer, is provided with the high-vanadium high-speed steel wear-resisting head through electroslag casting compound on hammer body top.
The length of described notch is 80mm-120mm.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon or the low-carbon cast steel hammer body of notch, the degree of depth of described notch is 50 mm-60mm, length is 80mm-120mm;
2, the electrode of the high-vanadium high-speed steel material of casting method with the vanishing pattern casting needed for electroslag smelting casting is adopted;
3, chromium alloyed steel wear-resistant block in carbon or low-carbon (LC) in utilizing ordinary casting method to cast, the shape of described wear-resistant block and the notch of described tup both sides match;
4, two wear-resistant block inserts are welded in the notch of described tup both sides, make wear-resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C-1050 DEG C, is incubated 2 hours-3 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 300 DEG C of-550 DEG C of tempering, make final products after being cooled to room temperature.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon or the low-carbon cast steel hammer body of notch, the degree of depth of described notch is 50 mm-60mm, length is 80mm-120mm;
2, the rich chromium cast iron of casting method with the vanishing pattern casting needed for electroslag smelting casting and the electrode of high-vanadium high-speed steel material is adopted;
3, utilize electroslag smelting casting method to manufacture low-carbon cast steel, rich chromium cast iron bimetal wear resistant block, the shape of described bimetal wear resistant block and the notch of described tup both sides match;
4, two bimetal wear resistant block inserts are welded in the notch of described tup both sides, make wear-resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C-1050 DEG C, is incubated 2 hours-3 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 300 DEG C of-550 DEG C of tempering, make final products after being cooled to room temperature.
The invention has the beneficial effects as follows:
1, adopt electroslag smelting casting method to make bimetal hammerhead, make to reach metallurgical binding completely between wear-resistant surface and hammer body, welding is firm, and carbon or low-carbon cast steel material during hammer body adopts, use safety does not rupture.
2, adopt high-vanadium high-speed steel material as the wear-resistant position of tup, drastically increase the anti-wear performance of tup, service life is potassium steel and forges more than 6 times of tup, and the 2-3 of bimetallic height chromium tup doubly.
3, hammer splicing of body upper position wear-resistant block into shape and namely prevent the premature failure at this position of tup, additionally reduce the consumption of high-vanadium high-speed steel, reduce cost, reach perfect matching with tup overall wear resistance, ensure that greatly overall tup service life.
4, substantially prolongs the replacement cycle of tup, alleviate the labour intensity of workman, improve production efficiency.
5, tup manufacture craft is simple and easy to do, and production efficiency is high, adopts quenching liquid quenching, decreases adding of precious metal, greatly reduce production cost.
6, contrast other products and have very high cost performance, customer using cost significantly reduces.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the structural representation of the embodiment of the present invention 2.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 50mm, length is 80mm, chromium alloyed steel wear-resistant block 2 in carbon (or low-carbon (LC)) at described notch place insert and in being welded with; The high-vanadium high-speed steel wear-resisting head 3 through electroslag casting compound is provided with on hammer body 1 top.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon (or low-carbon (LC)) the cast steel hammer body of notch, the degree of depth of described notch is 50 mm, length is 80mm;
2, the electrode of the high-vanadium high-speed steel material of casting method with the vanishing pattern casting needed for electroslag smelting casting is adopted;
3, chromium alloyed steel wear-resistant block in carbon (or low-carbon (LC)) in utilizing ordinary casting method to cast, the shape of described wear-resistant block and the notch of described tup both sides match;
4, two wear-resistant block inserts are welded in the notch of described tup both sides, make wear-resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C, is incubated 3 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 300 DEG C of tempering, make final products after being cooled to room temperature.
Embodiment 2
As shown in Figure 1, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 60mm, length is 120mm, chromium alloyed steel wear-resistant block 2 in carbon (or low-carbon (LC)) at notch place insert and in being welded with, is provided with the high-vanadium high-speed steel wear-resisting head 3 through electroslag casting compound on hammer body 1 top.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon (or low-carbon (LC)) the cast steel hammer body of notch, the degree of depth of described notch is 60mm, length is 120mm;
2, the electrode of the high-vanadium high-speed steel material of casting method with the vanishing pattern casting needed for electroslag smelting casting is adopted;
3, chromium alloyed steel wear-resistant block in carbon (or low-carbon (LC)) in utilizing ordinary casting method to cast, the shape of described wear-resistant block and the notch of described tup both sides match;
4, two wear-resistant block inserts are welded in the notch of described tup both sides, make wear-resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 1050 DEG C, is incubated 2 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 550 DEG C of tempering, make final products after being cooled to room temperature.
Embodiment 3
As shown in Figure 1, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 55mm, length is 100mm, chromium alloyed steel wear-resistant block 2 in carbon (or low-carbon (LC)) at notch place insert and in being welded with, is provided with on hammer body top the high-vanadium high-speed steel wear-resisting head 3 being provided with compound through electroslag casting.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon or the low-carbon cast steel hammer body of notch, the degree of depth of described notch is 55mm, length is 100mm;
2, the electrode of the high-vanadium high-speed steel material of casting method with the vanishing pattern casting needed for electroslag smelting casting is adopted;
3, chromium alloyed steel wear-resistant block in carbon (or low-carbon (LC)) in utilizing ordinary casting method to cast, the shape of described wear-resistant block and the notch of described tup both sides match;
4, two wear-resistant block inserts are welded in the notch of described tup both sides, make wear-resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 1000 DEG C, is incubated 2.5 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 420 DEG C of tempering, make final products after being cooled to room temperature.
Embodiment 4
As shown in Figure 2, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 50mm, length is 80mm, be welded with bimetal wear resistant block 4 at described notch place insert, described bimetal wear resistant block 4 forms by through electroslag smelting casting composite low-carbon cast steel layer 401 and rich chromium cast iron top layer 402; The high-vanadium high-speed steel wear-resisting head 3 through electroslag casting compound is provided with on hammer body 1 top.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon (or low-carbon (LC)) the cast steel hammer body of notch, the degree of depth of described notch is 50 mm, length is 80mm;
2, the rich chromium cast iron of casting method with the vanishing pattern casting needed for electroslag smelting casting and the electrode of high-vanadium high-speed steel material is adopted;
3, utilize electroslag smelting casting method to manufacture low-carbon cast steel, rich chromium cast iron bimetal wear resistant block, the shape of described bimetal wear resistant block and the notch of described tup both sides match;
4, two bimetal wear resistant block inserts are welded in the notch of described tup both sides, make bimetal wear resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C, is incubated 3 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 300 DEG C of tempering, make final products after being cooled to room temperature.
Embodiment 5
As shown in Figure 2, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 60mm, length is 120mm, be welded with bimetal wear resistant block 4 at described notch place insert, described bimetal wear resistant block 4 forms by through electroslag smelting casting composite low-carbon cast steel layer 401 and rich chromium cast iron top layer 402; The high-vanadium high-speed steel wear-resisting head 3 through electroslag casting compound is provided with on hammer body 1 top.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon (or low-carbon (LC)) the cast steel hammer body of notch, the degree of depth of described notch is 60 mm, length is 120mm;
2, the rich chromium cast iron of casting method with the vanishing pattern casting needed for electroslag smelting casting and the electrode of high-vanadium high-speed steel material is adopted;
3, utilize electroslag smelting casting method the electrode founding of rich chromium cast iron material to low-carbon cast steel block will to manufacture low-carbon cast steel, rich chromium cast iron bimetal wear resistant block, the shape of described bimetal wear resistant block and the notch of described tup both sides match;
4, two bimetal wear resistant block inserts are welded in the notch of described tup both sides, make bimetal wear resistant block equal with hammer body side, ensure firm welding;
5, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6, tup adopts high temperature resistance furnace to heat-treat, and is heated to 1050 DEG C, is incubated 2 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 550 DEG C of tempering, make final products after being cooled to room temperature.
Embodiment 6
As shown in Figure 2, combined and welded bimetal wear resistant tup, comprise middle carbon (or low-carbon (LC)) cast steel hammer body 1, hammer middle and upper part, body 1 both sides is provided with notch, the degree of depth of described notch is 55mm, length is 100mm, be welded with bimetal wear resistant block 4 at described notch place insert, described bimetal wear resistant block 4 forms by through electroslag smelting casting composite low-carbon cast steel layer 401 and rich chromium cast iron top layer 402; The high-vanadium high-speed steel wear-resisting head 3 through electroslag casting compound is provided with on hammer body 1 top.
The manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1, adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon (or low-carbon (LC)) the cast steel hammer body of notch, the degree of depth of described notch is 55 mm, length is 100mm;
2, the rich chromium cast iron of casting method with the vanishing pattern casting needed for electroslag smelting casting and the electrode of high-vanadium high-speed steel material is adopted;
3, utilize electroslag smelting casting method the electrode founding of rich chromium cast iron material to low-carbon cast steel block will to manufacture low-carbon cast steel, rich chromium cast iron bimetal wear resistant block, the shape of described bimetal wear resistant block and the notch of described tup both sides match;
4, two bimetal wear resistant block inserts are welded in the notch of described tup both sides, make bimetal wear resistant block equal with hammer body side, ensure firm welding;
7, utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
8, tup adopts high temperature resistance furnace to heat-treat, and is heated to 1000 DEG C, is incubated 2.5 hours, comes out of the stove and adopts the quenching of rich chromium cast iron quenching liquid, carry out 430 DEG C of tempering, make final products after being cooled to room temperature.
Claims (4)
1. combined and welded bimetal wear resistant tup, comprise middle carbon or low-carbon cast steel hammer body, it is characterized in that: hammer middle and upper part, body both sides is provided with notch, the degree of depth of described notch is 50mm-60mm, chromium alloyed steel wear-resistant block or bimetal wear resistant block in carbon or low-carbon (LC) at notch place insert and in being welded with, described bimetal wear resistant block forms by through electroslag smelting casting composite low-carbon cast steel layer and rich chromium cast iron top layer, is provided with the high-vanadium high-speed steel wear-resisting head through electroslag casting compound on hammer body top.
2. combined and welded bimetal wear resistant tup according to claim 1, is characterized in that: the length of described notch is 80mm-120mm.
3. the manufacture method of combined and welded bimetal wear resistant tup, is characterized in that:
1), adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon or the low-carbon cast steel hammer body of notch, the degree of depth of described notch is 50 mm-60mm, length is 80mm-120mm;
2) electrode of the high-vanadium high-speed steel material of casting method with the vanishing pattern casting needed for electroslag smelting casting, is adopted;
3), utilize ordinary casting method to cast in chromium alloyed steel wear-resistant block in carbon or low-carbon (LC), the shape of described wear-resistant block and the notch of described tup both sides match;
4), by two wear-resistant block inserts to be welded in the notch of described tup both sides, to make wear-resistant block equal with hammer body side, ensure firm welding;
5), utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6), tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C-1050 DEG C, be incubated 2 hours-3 hours, come out of the stove and adopt rich chromium cast iron quenching liquid to quench, carry out 300 DEG C of-550 DEG C of tempering, make final products after being cooled to room temperature.
4. the manufacture method of combined and welded bimetal wear resistant tup, its step is as follows:
1), adopt casting method with the vanishing pattern casting both sides to be provided with middle carbon or the low-carbon cast steel hammer body of notch, the degree of depth of described notch is 50 mm-60mm, length is 80-120mm;
2) rich chromium cast iron of casting method with the vanishing pattern casting needed for electroslag smelting casting and the electrode of high-vanadium high-speed steel material, is adopted;
3), utilize electroslag smelting casting method to manufacture low-carbon cast steel, rich chromium cast iron bimetal wear resistant block, the shape of described bimetal wear resistant block and the notch of described tup both sides match;
4), by two bimetal wear resistant block inserts to be welded in the notch of described tup both sides, to make wear-resistant block equal with hammer body side, ensure firm welding;
5), utilize electroslag smelting casting method that the electrode founding of high-vanadium high-speed steel material is compounded to form bimetal wear resistant tup to hammer body top, reach complete metallurgical binding, welding is firm;
6), tup adopts high temperature resistance furnace to heat-treat, and is heated to 950 DEG C-1050 DEG C, be incubated 2 hours-3 hours, come out of the stove and adopt rich chromium cast iron quenching liquid to quench, carry out 300 DEG C of-550 DEG C of tempering, make final products after being cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827842.4A CN104549651B (en) | 2014-12-29 | 2014-12-29 | Electroslag smelting casting combined welding type dual-metal wear-resistant hammer head and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410827842.4A CN104549651B (en) | 2014-12-29 | 2014-12-29 | Electroslag smelting casting combined welding type dual-metal wear-resistant hammer head and manufacturing method thereof |
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| CN104549651A true CN104549651A (en) | 2015-04-29 |
| CN104549651B CN104549651B (en) | 2017-04-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242633A (en) * | 2015-10-27 | 2016-01-13 | 张荣斌 | Alloy plate hammer intelligent preparation method |
| CN112045166A (en) * | 2020-09-15 | 2020-12-08 | 东阳市科灵装备制造股份有限公司 | Three-metal cold-hot composite high-chromium cast iron composite hammer head and manufacturing process thereof |
| CN113787303A (en) * | 2021-08-23 | 2021-12-14 | 苏州福乐友机械科技有限公司 | Machining process for improving wear resistance of motor rotor shaft |
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| CN2232798Y (en) * | 1995-07-21 | 1996-08-14 | 向龙生 | Double metal wear resistance hammer made of electroslag casting |
| CN2825101Y (en) * | 2005-09-30 | 2006-10-11 | 赵金盛 | Crusher hammer sheet |
| US20090114751A1 (en) * | 2006-04-28 | 2009-05-07 | Johann Doppstadt | Hammer for a Comminuting Device |
| CN202983777U (en) * | 2012-12-23 | 2013-06-12 | 佳木斯大学 | Combined bimetal casting composite hammerhead |
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| CN2232798Y (en) * | 1995-07-21 | 1996-08-14 | 向龙生 | Double metal wear resistance hammer made of electroslag casting |
| CN2825101Y (en) * | 2005-09-30 | 2006-10-11 | 赵金盛 | Crusher hammer sheet |
| US20090114751A1 (en) * | 2006-04-28 | 2009-05-07 | Johann Doppstadt | Hammer for a Comminuting Device |
| CN202983777U (en) * | 2012-12-23 | 2013-06-12 | 佳木斯大学 | Combined bimetal casting composite hammerhead |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242633A (en) * | 2015-10-27 | 2016-01-13 | 张荣斌 | Alloy plate hammer intelligent preparation method |
| CN105242633B (en) * | 2015-10-27 | 2018-09-21 | 浙江国正安全技术有限公司 | A kind of intelligent preparation method of alloy bar |
| CN112045166A (en) * | 2020-09-15 | 2020-12-08 | 东阳市科灵装备制造股份有限公司 | Three-metal cold-hot composite high-chromium cast iron composite hammer head and manufacturing process thereof |
| CN113787303A (en) * | 2021-08-23 | 2021-12-14 | 苏州福乐友机械科技有限公司 | Machining process for improving wear resistance of motor rotor shaft |
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| Publication number | Publication date |
|---|---|
| CN104549651B (en) | 2017-04-12 |
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