CN106367669A - Slurry pump casting and machining process thereof - Google Patents

Slurry pump casting and machining process thereof Download PDF

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Publication number
CN106367669A
CN106367669A CN201610781852.8A CN201610781852A CN106367669A CN 106367669 A CN106367669 A CN 106367669A CN 201610781852 A CN201610781852 A CN 201610781852A CN 106367669 A CN106367669 A CN 106367669A
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CN
China
Prior art keywords
pulp pump
foundry goods
pump foundry
processing technique
mould
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610781852.8A
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Chinese (zh)
Inventor
罗大明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENGDU YONGYI PUMPS Co Ltd
Original Assignee
CHENGDU YONGYI PUMPS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHENGDU YONGYI PUMPS Co Ltd filed Critical CHENGDU YONGYI PUMPS Co Ltd
Priority to CN201610781852.8A priority Critical patent/CN106367669A/en
Publication of CN106367669A publication Critical patent/CN106367669A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • 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
    • 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
    • C21D2211/008—Martensite

Abstract

The invention discloses a slurry pump casting and a machining process thereof. The slurry pump casting comprises, by weight percentage, greater than or equal to 2.0% and smaller than or equal to 3.5% of C, greater than or equal to 0.4% and smaller than or equal to 1.5% of Si, greater than or equal to 0.5% and smaller than or equal to 1.5% of Mn, greater than or equal to 20% and smaller than or equal to 35% of Cr, greater than or equal to 0.1% of P, greater than or equal to 0.1% of S and the balance iron. The slurry pump casting has the beneficial effects of being good in impact resistance and high in corrosion resistance.

Description

A kind of Pulp pump foundry goods and its processing technique
Technical field
Patent of the present invention is related to field of metallurgy, particularly to a kind of Pulp pump foundry goods and its processing technique.
Background technology
Pulp pump mainly applies to solidliquid mixture transport, and Pulp pump rapid wear flow passage components have: sheath, impeller, apron plate, Backplate afterwards.Its working condition the wearability of flow passage components material is required very high, need to possess simultaneously certain corrosion resistance with tough Property.
The use condition of Pulp pump is more severe, needs to bear high abrasion HI high impact, and chassis operation upset has larger Impulsive force, the Pulp pump parts abrasion resistance properties of prior art preparation are poor, and impact resistance is poor.
Content of the invention
The technical problem to be solved and the technical assignment proposing are that prior art is improved, and the present invention carries For a kind of Pulp pump foundry goods and its processing technique, the economical good advantage of processing method that the present invention provides, by this plus The Pulp pump foundry goods that work method obtains has that impact resistance is good, the good advantage of wearability.
For solving above technical problem, the technical scheme is that a kind of Pulp pump foundry goods, described Pulp pump foundry goods The percentage by weight of chemical composition includes: 2.0%≤c≤3.5%, 0.4%≤si≤1.5%, 0.5≤mn≤1.5%, and 20% ≤ cr≤35%, p≤0.1%, s≤0.1%, balance of ferrum.
Preferably, the percentage by weight of the chemical composition of described Pulp pump foundry goods includes: the chemistry of described Pulp pump foundry goods The percentage by weight of composition is: 2.1%≤c≤3.2%, 0.4%≤si≤1.0%, 0.8≤mn≤1.5%, 20%≤cr≤ 32%, p≤0.07%, s≤0.05%, balance of ferrum.
Preferably, the percentage by weight of the chemical composition of described Pulp pump foundry goods includes: c=2.5%, si=0.6%, mn =1.2%, p=0.03, s=0.05%, cr=26%, balance of ferrum.
A kind of processing technique of Pulp pump foundry goods is it is characterised in that described processing technique is:
1) make Pulp pump casting die；
2) by the pig iron, steel scrap, rich chromium cast iron, ferromanganese mixes, and obtains mixture；
3) described mixture is put into medium-frequency induction furnace and carry out melting, the molten iron that melting obtains shifts after melting down removing slag To ladle；
4) molten iron injection mould is poured into a mould, obtained prefabricated component, the chemical composition of described prefabricated component is by weight percentage Including: c=2.5%, si=0.6%, mn=1.2%, p=0.03, s=0.05%, cr=26%, balance of ferrum；
5) obtain roughing part by rough turn for prefabricated component；
6) heat treatment is carried out to described roughing part, obtain Pulp pump blank；
7) smart car is carried out to described Pulp pump blank.
Preferably, described mould is provided with running channel, and described running channel is cross gate, is provided with ceramic filter in described cross gate Piece.
Preferably, the upper surface of described mould is provided with riser runner, is provided with chill at the thermal center of described mould.
Preferably, the neck size of described riser runner is 1.5-2.8 times of thermal center circle, and described riser runner is provided with 45 ° of lead angles.
Preferably, the molding sand that described mould adopts is furan resin-sand.
Preferably, the tapping temperature of described molten iron is 1480 DEG C -1500 DEG C, and pouring temperature is 1360 DEG C -1420 DEG C.
Preferably, described Technology for Heating Processing is:
1) described roughing part is warming up to 800 DEG C, programming rate is 40-50 DEG C/h；
2) described roughing part is warming up to 1000 DEG C, will be cold for the prefabricated component laggard sector-style that carries out quenching；
3) described roughing part stove is tempered to after 280 DEG C and is air cooled to room temperature.
The Pulp pump casting hardness that this method processing obtains is hrc58-61, and it is high to have hardness, the advantage of long service life, Technology for Heating Processing in this processing method has crystal grain thinning, the advantage effectively removing casting stress, and this processing method obtains The metallographic structure of Pulp pump foundry goods includes austenite, carbide and partial martensite, by reducing martensite, increases austenite, Be conducive to improving the toughness of cast iron, improve wearability and resistance to impact.
The present invention provides a kind of Pulp pump foundry goods and its processing technique, the Pulp pump foundry goods tool being obtained by this processing method There is impact resistance good, the high advantage of wearability.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all Belong to the scope of protection of the invention.
Carbon: c content, below 2.0 mass %, easily generates carbide, causes stone more than 4.0 mass % in cast iron Ink separates out, alloy carbide m7c3Content is higher, and wearability is higher, and toughness is lower, reduces intensity and the toughness of cast iron, therefore, this Invention carbon mass percent controls in 2.0%≤c≤3.5%.
Silicon: silicon is to promote graphitization, reduces a kind of deoxidant element of quenching degree, and silicone content is higher, and quenching degree is poorer, air quenching Produce sorbite tissue afterwards, wearability reduces, and fragility increases, and therefore, in the present invention, silicon mass percent controls in 0.4%≤si ≤ 1.5%.
Manganese: mn is to be that s is fixed in the form of mns and makes it innoxious required by the inevitable impurity of material Element, be conducive to obtaining martensitic structure simultaneously, and quenching degree can be effectively improved, martensitic structure subtracts when manganese is more than 2% Few, retained austenite increases, and hardness reduces, and therefore, in the present invention, manganese mass percent controls in 0.8≤mn≤1.5%.
Chromium: chromium may advantageously facilitate the formation of carbide, effectively obtaining white structure, thus improving the hardness of carbide, changing Kind wearability, the present invention passes through to control the mass percent of chromium and carbon, and then ensure the present invention product obtain excellent wear-resisting Property, therefore in the present invention, chromium mass percent controls in 20%≤cr≤35%.
The processing technique of described metal is:
A kind of processing technique of Pulp pump foundry goods is it is characterised in that described processing technique is:
1) make Pulp pump casting die, described mould is provided with cross gate, is provided with filter in described cross gate.
The neck size of described rising head is 1.5-2.8 times of thermal center circle, and described rising head is provided with 45 ° of lead angles, described mould Using molding sand be furan resin-sand；
2) make Pulp pump casting die；
3) described mixture is put into medium-frequency induction furnace and carry out melting, the molten iron that melting obtains shifts after melting down removing slag To ladle；
4) molten iron injection mould is poured into a mould, obtained prefabricated component, the tapping temperature of described molten iron is 1480 DEG C -1500 DEG C, pouring temperature is 1360 DEG C -1420 DEG C, and the chemical composition of described prefabricated component includes by weight percentage: c=2.5%, si= 0.6%, mn=1.2%, p=0.03, s=0.05%, cr=26%, balance of ferrum；
5) obtain roughing part by rough turn for prefabricated component；
6) heat treatment is carried out to described roughing part, obtains Pulp pump blank, Technology for Heating Processing is:
A) described roughing part is warming up to 800 DEG C, programming rate is 40-50 DEG C/h；
B) described roughing part is warming up to 1000 DEG C, will be cold for the prefabricated component laggard sector-style that carries out quenching；
C) described roughing part stove is tempered to after 280 DEG C and is air cooled to room temperature；
7) smart car is carried out to described Pulp pump blank.
A kind of Pulp pump foundry goods disclosed in this invention and its processing technique are it is adaptable to reuse the waste and old life in steel mill Ferrum and waste and old cast iron, for ensure gained Pulp pump foundry goods chemical composition meet actually used in the case of Pulp pump foundry goods power Learn performance, its processing technique also should be made defined below:
For ensureing to obtain good cast form in casting process, from open running channel, and place pottery in cross gate Porcelain filter, enters die cavity for reducing stream slag, and sheath and backplate all carry out feeding using 1-2 hot riser, upper surface and convex Riser runner or slotting venthole are put in platform position, and lay chill at thermal center, and for obtaining dense structure, no shrinkage cavity and porosity lacks Sunken foundry goods.
Rising head is connected using closed-entry riser neck with foundry goods body, and riser neck size is advisable with 1.5-2.8 times of thermal center circle, And fall 45° angle, make knock-off head, for controlling gouge speed, eliminate the crackle in foundry goods, avoid in process simultaneously Produce crack.
Prefabricated component for ensureing each cast meets needs of production, with case cast tensile strength examination in injection molded process Rod, and chemical composition is carried out to coupon and mechanical property tests and analyzes.
For eliminating the internal stress of nodularization cast iron prefabricated component, improve metal structure to obtain more preferable mechanical property, heat treatment Technique should be carried out after rough turn, and the Pulp pump blank through Overheating Treatment acquisition, through smart car, obtains Pulp pump foundry goods, due to height The poor thermal conductivity of chrome cast iron, so will be slowly heated when less than 800 DEG C, described heat processing technique is:
1) described roughing part is warming up to 800 DEG C, programming rate is 40-50 DEG C/h；
2) described roughing part is warming up to 1000 DEG C, will be cold for the prefabricated component laggard sector-style that carries out quenching；
3) described roughing part stove is tempered to after 280 DEG C and is air cooled to room temperature.
Prefabricated component for ensureing gained after cast meets needs of production, should carry out defect inspection to prefabricated component, checks Including:
1st, prefabricated component is not allow for crackle and is evident that the casting flaws such as pore, slag inclusion, shrinkage porosite, cold shut, Zou's skin；
2nd, the surface defect that prefabricated component allows, the surface defect that it allows is not more than shown in following table
Surface defect type and parameter that table 1 allows
Fleshiness/mm at cast gate Scab area/mm2 Local residues overlap/mm
3 30 5.0-8.0
Depth/mm Single hole area/mm2 The gross area/mm2
2.2 18 45
3rd, prefabricated component is not allow for shrinkage cavity and porosity, pore, slag inclusion and other cavities on the cutting plane by cast gate center Defect；
4th, be ensure cast after the prefabricated component of gained meet needs of production, tackle each of preparation in above-mentioned technique Stove molten iron carries out chemical composition inspection, and the Pulp pump foundry goods that each stove prepares is sampled check.
The coupon performance evaluation of table 2 embodiment 1
Embodiment 2-6
By a kind of processing method of above-mentioned Pulp pump foundry goods, prepare the reality of chemical composition different quality percentage ratio Apply a 2-6, the chemical composition of Pulp pump foundry goods that each embodiment obtains and coupon performance are as shown in the table:
The chemical composition of table 3 embodiment 2-6 and corresponding coupon performance evaluation
The Pulp pump casting hardness that this method processing obtains is hrc58-61, and it is high to have hardness, the advantage of long service life, Technology for Heating Processing in this processing method has crystal grain thinning, the advantage effectively removing casting stress, and this processing method obtains The metallographic structure of Pulp pump foundry goods includes austenite, carbide and partial martensite, by reducing martensite, increases austenite, Be conducive to improving the toughness of cast iron, improve wearability and resistance to impact.
The present invention provides a kind of Pulp pump foundry goods and its processing technique, the Pulp pump foundry goods tool being obtained by this processing method There is impact resistance good, the high advantage of wearability.
The above is only the preferred embodiment of the present invention it is noted that above-mentioned preferred implementation be not construed as right The restriction of the present invention, protection scope of the present invention should be defined by claim limited range.For the art For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change Enter and retouch also to should be regarded as protection scope of the present invention.

Claims (10)

1. a kind of Pulp pump foundry goods is it is characterised in that the percentage by weight of the chemical composition of described Pulp pump foundry goods includes: 2.0%≤c≤3.5%, 0.4%≤si≤1.5%, 0.5≤mn≤1.5%, 20%≤cr≤35%, p≤0.1%, s≤ 0.1%, balance of ferrum.
2. a kind of Pulp pump foundry goods according to claim 1 is it is characterised in that the chemical composition of described Pulp pump foundry goods Percentage by weight includes: 2.1%≤c≤3.2%, 0.4%≤si≤1.0%, 0.8≤mn≤1.5%, and 20%≤cr≤ 32%, p≤0.07%, s≤0.05%, balance of ferrum.
3. a kind of Pulp pump foundry goods according to claim 2 is it is characterised in that the chemical composition of described Pulp pump foundry goods Percentage by weight includes: c=2.5%, si=0.6%, mn=1.2%, p=0.03, s=0.05%, cr=26%, balance of Ferrum.
4. a kind of processing technique of Pulp pump foundry goods is it is characterised in that described processing technique is:
1) make the mould of Pulp pump foundry goods；
2) by the pig iron, steel scrap, rich chromium cast iron, ferromanganese mixes, and obtains mixture；
3) described mixture is put into medium-frequency induction furnace and carry out melting, the molten iron that melting obtains is transferred to ferrum after melting down removing slag Water bag；
4) molten iron injection mould is poured into a mould, is obtained prefabricated component, the chemical composition of described prefabricated component includes by weight percentage: C=2.5%, si=0.6%, mn=1.2%, p=0.03, s=0.05%, cr=26%, balance of ferrum；
5) obtain roughing part by rough turn for prefabricated component；
6) heat treatment is carried out to described roughing part, obtain Pulp pump blank；
7) smart car is carried out to described Pulp pump blank.
5. a kind of processing technique of Pulp pump foundry goods according to claim 4 is it is characterised in that described mould is provided with and pours Road, described running channel is cross gate, is provided with ceramic filter in described cross gate.
6. a kind of processing technique of Pulp pump foundry goods according to claim 4 is it is characterised in that the upper surface of described mould It is provided with riser runner, at the thermal center of described mould, be provided with chill.
7. a kind of processing technique of Pulp pump foundry goods according to claim 6 is it is characterised in that the neck of described riser runner 1.5-2.8 times of portion's a size of thermal center circle, described riser runner is provided with 45 ° of lead angles.
8. a kind of Pulp pump foundry goods according to claim 4 processing technique it is characterised in that described mould adopt type Sand is furan resin-sand.
9. a kind of Pulp pump foundry goods according to claim 4 processing technique it is characterised in that described molten iron go out furnace temperature Spend for 1480 DEG C -1500 DEG C, pouring temperature is 1360 DEG C -1420 DEG C.
10. a kind of processing technique of Pulp pump foundry goods according to claim 4 is it is characterised in that described Technology for Heating Processing For:
1) described roughing part is warming up to 800 DEG C, programming rate is 40-50 DEG C/h；
2) described roughing part is warming up to 1000 DEG C, will be cold for the prefabricated component laggard sector-style that carries out quenching；
3) described roughing part stove is tempered to after 280 DEG C and is air cooled to room temperature.
CN201610781852.8A 2016-08-30 2016-08-30 Slurry pump casting and machining process thereof Pending CN106367669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610781852.8A CN106367669A (en) 2016-08-30 2016-08-30 Slurry pump casting and machining process thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610781852.8A CN106367669A (en) 2016-08-30 2016-08-30 Slurry pump casting and machining process thereof

Publications (1)

Publication Number Publication Date
CN106367669A true CN106367669A (en) 2017-02-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113444965A (en) * 2021-05-19 2021-09-28 山东章鼓耐研新材料科技有限公司 Slurry pump overflowing piece and manufacturing process
CN114657451A (en) * 2022-03-29 2022-06-24 西安热工研究院有限公司 Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1769508A (en) * 2005-11-10 2006-05-10 西安交通大学 Low cost, high-wearability hypereutectic high chromium cast iron and its production method
CN102758125A (en) * 2012-07-17 2012-10-31 安徽三联泵业股份有限公司 White cast iron for flow passage component
CN103556042A (en) * 2013-10-23 2014-02-05 德州宏森机械有限公司 Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump
CN105506443A (en) * 2015-12-30 2016-04-20 安徽昱工耐磨材料科技有限公司 High-chromium cast-iron roller sheet and machining method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1769508A (en) * 2005-11-10 2006-05-10 西安交通大学 Low cost, high-wearability hypereutectic high chromium cast iron and its production method
CN102758125A (en) * 2012-07-17 2012-10-31 安徽三联泵业股份有限公司 White cast iron for flow passage component
CN103556042A (en) * 2013-10-23 2014-02-05 德州宏森机械有限公司 Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump
CN105506443A (en) * 2015-12-30 2016-04-20 安徽昱工耐磨材料科技有限公司 High-chromium cast-iron roller sheet and machining method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113444965A (en) * 2021-05-19 2021-09-28 山东章鼓耐研新材料科技有限公司 Slurry pump overflowing piece and manufacturing process
CN114657451A (en) * 2022-03-29 2022-06-24 西安热工研究院有限公司 Hypereutectic high-chromium cast iron and suspension and modification composite treatment method thereof

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Address after: 610300 Sichuan province Chengdu City Development Zone Qingbaijiang industrial zone with Wang Lu

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