CN102230173B - Full-coating cladding thread element for parallel double-screw extruder - Google Patents

Full-coating cladding thread element for parallel double-screw extruder Download PDF

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Publication number
CN102230173B
CN102230173B CN 201010205228 CN201010205228A CN102230173B CN 102230173 B CN102230173 B CN 102230173B CN 201010205228 CN201010205228 CN 201010205228 CN 201010205228 A CN201010205228 A CN 201010205228A CN 102230173 B CN102230173 B CN 102230173B
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screwing
base
nickel
cladding
cast steel
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CN 201010205228
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CN102230173A (en
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张宗海
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张宗海
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Abstract

The invention relates to a manufacturing process and method for steel billet casting (or billet piece machining), spraying (or slurry coating), vacuum cladding (or gas shielding) and precise machining of a full-coating cladding thread sleeve and a kneading block (short for a thread element as follows)for a parallel double-screw extruder. The process is characterized in that the thread element in a complete melt state with high resistance and high corrosion resistance is formed by mutually melting a cast steel billet (or a machined billet piece) and a nickel base or nickel based tungsten carbide. The full-coating cladding thread element manufactured according to the invention has the advantages of reasonable structure, advanced industries and excellent wear resistance and corrosion resistance and belongs to novel domestic initiative products manufactured by novel processes and novel materials. The thread element for the parallel double-screw extrude, provided by the invention, can satisfy technical regulations and use requirements of the parallel double-screw extruder in both mechanical property and mechanical property and is largely superior to traditional high-speed tool steel (W6MO5CR4V2) in each comprehensive property.

Description

Full-coating cladding thread element for parallel double-screw extruder
Technical field
The present invention relates to a kind of parallel double-screw extruder with the manufacture method of full coating pairing gold cladding type thread bush, kneading block.
Background technology
Along with after China's plastic cement industry, feedstuff industry, building material industry, line cable industry use parallel double-screw extruder in large quantities, greatly having changed single screw extrusion machine, to extrude powder single, and mixing uniformity is poor, the not high defective of output.But because the property indices of parallel double-screw extruder improves constantly, and the kind of extruded material is day by day various, as after adding the strong material of a lot of toughness reinforcing, enhancings, wear-resistant, shearing resistance, corrodibility, so just to anti-anti-, corrosion-resistant the having higher requirement of the screwing element in the parallel double-screw extruder.On the basis of most domestic use 38CR2MOAL2 nitrogen steel, increased again the screwing element of rapid tool steel (W6MO5CR4V2); and be exactly to have used this expensive, steel grade that difficulty of processing is high; after having added therein the materials such as glass such as high composition, calcium carbonate, carbonic acid gas; generally after 2~4 months, namely suffer heavy wear and shut down replacing its work-ing life; and full coating cladding type pairing gold shell line element can with the situation of above identical material under improve work-ing life more than 6 months, maximum duration can reach 1 year more than the usage period.Be more than 3 times of (W6MO5CR4V2) mean life, and market value only is about the twice of (W6MO5CR4V2).Complete succeeding in developing with industrialization of coating cladding type screwing element used, the upgrading of China's parallel double-screw extruder will be promoted greatly, can compare favourably in performance with the parallel double-screw extruder of world first-class brand, have very significantly economic benefit and social benefit.
Summary of the invention
The product performance of the inventive method preparation are as follows:
The main application fields of full-coating cladding thread element for parallel double-screw extruder is plastics machinery industry, cable machinery industry, building material machinery industry and feed manufacturing machine industry etc., and every technical parameter of cladding type screwing element sees Table 1 and table 2:
Table 1
Title The model classification Specification Mm Tensile strength mpa Hardness HRC Mutual crucible zone μ m Cladding layer density g/cm 3 Wear resistance Rotproofness
Thread bush L/10T 20~300 ≥300 ≥60 ≥64 9.75 Good Good
Thread bush L/15T 20~300 ≥300 ≥60 ≥64 10.20 Good Good
Thread bush L/20T 20~300 ≥300 ≥60 ≥64 10.60 Good Good
Thread bush L/25T 20~300 ≥300 ≥60 ≥64 11.00 Good Good
Thread bush L/30T 20~300 ≥300 ≥60 ≥64 11.50 Good Good
Thread bush L/35T 20~300 ≥300 ≥60 ≥64 12.00 Good Good
Table 2
Title The model classification Specification Mm Tensile strength mpa Hardness HRC Mutual crucible zone μ m Cladding layer density g/cm 3 Wear resistance Rotproofness
Kneading block L/10T 20~300 ≥300 ≥60 ≥64 9.75 Good Good
Kneading block L/15T 20~300 ≥300 ≥60 ≥64 10.20 Good Good
Kneading block L/20T 20~300 ≥300 ≥60 ≥64 10.60 Good Good
Kneading block L/25T 20~300 ≥300 ≥60 ≥64 11.00 Good Good
Kneading block L/30T 20~300 ≥300 ≥60 ≥64 11.50 Good Good
Kneading block L/35T 20~300 ≥300 ≥60 ≥64 12.00 Good Good
The full-coating cladding thread element for parallel double-screw extruder beneficial effect of the invention is: full-coating cladding thread element for parallel double-screw extruder of the present invention rational in infrastructure, technique is advanced, combination rate and wear-resisting and corrosion resistance nature are better than rapid tool steel (W6MO5CR4V2) greatly; Again because the medium carbon steel base base of full-coating cladding thread element for parallel double-screw extruder replaces traditional bar process for machining with precision casting, only need tradition mach 1/3rd with the material amount, can be country and save a large amount of high-quality steel; Owing to adopted tungsten carbide of nickel-base cladding novel process novel material, the wear resisting property of screwing element and corrosion resistance nature can reach more than 4 times of rapid tool steel (W6MO5CR4V2) again.Cladding type screwing element is the product innovation of the novel process novel material of domestic initiation, it not only can reduce significantly the starting material production cost, save high-quality steel resource, and cost performance is high, fill up the novel process of China's parallel double-screw extruder industry blank, the new technology of novel material for one especially, have significantly economic benefit and social benefit.
Description of drawings
Fig. 1 kneading block structure iron.
Fig. 2 kneading block coating synoptic diagram.
Fig. 3 threaded rod structure iron.
Fig. 4 threaded rod coating synoptic diagram.
Fig. 5 Ni-WC alloy micro-structural feature.
Fig. 6 Wear Resistance trial report.
Embodiment
According to following embodiment, the present invention may be better understood.Yet, those skilled in the art will readily understand that embodiment is described only to be used for explanation the present invention, and should also can not limit the present invention described in detail in claims.
Embodiment 1:
1, the technical process for casting of steel billet
A, cured molded work: according to the casting accuracy standard of steel billet, select good U.S. produce in temperature cured, Australia produces zirconium ytterbium sand and makes the cured mould of casting;
B, selection precision casting steel: according to the casting accuracy technical specifications of steel billet, the steel ingot that selector alloying billet quality requires;
C, intermediate frequency furnace melting: selected casting is dosed into the intermediate frequency furnace melting of heating with steel ingot, and stirs, Control for Kiln Temperature is at 1450 ℃;
D, accurate casting steel billet: the liquid steel aqueous fusion liquid with fully melting liquefaction and stir in the intermediate frequency furnace, water one by one and smash cured mould steel billet;
E, the demoulding are deburred: the cast steel base until cast molding fully cools off the rear demoulding, removes the zirconium ytterbium sand and the cast steel base burr that remain on the cast steel base;
F, tempering: with the cast steel base screwing element of precision casting, internal stress is removed in tempering in 350 ℃ tempering stove, prevents hydrogen embrittlement;
G, polishing: will put into the polishing machine polishing through the cast steel base screw thread distant view after the tempering, and remove hydrogenation skin and the residual impurity such as zirconium ytterbium sand;
H, check: the cast steel base screwing element after will polishing is delivered check, and the qualified product vanning is stand-by.
2, spray welding process flow process
A, digital controlled lathe on the cast steel base screwing element is pressed drawing dimensional precision processing end flat and endoporus, upper milling machine is processed into the surfacing standardized component by the drawing dimensional precision;
B, with broaching machine on the surfacing standardized component of cast steel base screwing element, press drawing dimension precision requirement control endoporus spline;
C, the cast steel base screwing element that will draw the endoporus spline are put into the polishing machine polishing, remove product surface oxide skin and burr;
D, polished cast steel base screwing element is placed the nitrogen protection bucket, prevent that the product ingress of air from producing oxidation;
E, the cast steel base screwing element in the nitrogen protection bucket taken out penetrate rapidly on the splined shaft, after preheating on the spray bed, spraying tungsten carbide of nickel-base powder;
F, check: the screwing element to spraying tungsten carbide of nickel-base powder is tested, and lower road cladding operation is transferred in circulation behind the qualified product.
3, melting and coating process flow process
A, the screwing element that will spray Ni-based powder or tungsten carbide of nickel-base are packed into and are treated cladding in the vacuum electric furnace;
B, fill nitrogen in the vacuum electric furnace of the spraying tungsten carbide of nickel-base screwing element of packing into, nitrogen pressure is 0.1kg/m 3
The vacuum electric furnace cladding temperature of c, tungsten carbide of nickel-base screwing element is 900-1100 ℃;
D, with the tungsten carbide of nickel-base screwing element tempering in tempering stove after the cladding, eliminate internal stress, prevent hydrogen embrittlement;
F, check: the tungsten carbide of nickel-base screwing element after cladding and the tempering is estimated and instrument testing the lower road of qualified product vanning circulation machining processes.
4, mechanical processing technique flow process
A, will carry out through the screwing element salable product of fusion covered nickel base carbide layers line cutting processing end face;
B, will be through lathe in machining end face and inner bore chamfering on the line cutting rear thread element;
C, will be through CNC milling machine processing overall dimensions on the screwing element after the lathe in machining;
D, will roughly grind through numerically control grinder on the screwing element after the CNC milling machine processing, half correct grinding, ground finish, be taken up in order of priority with 80#, 100#, 120# grinding wheel;
E, inspection after construction: to testing one by one, detect, shunt qualified and substandard product through the screwing element product after cladding and the mechanical workout;
F, to check, detect qualified cladding type screwing element product and carry out the class wrapping warehouse-in.

Claims (1)

1. full-coating cladding thread element for parallel double-screw extruder, it is characterized by: at the cast steel base surface uniform of the screwing element precision casting tungsten carbide of nickel-base layer of cladding last layer high abrasion and corrosion resistance nature with one heart, guarantee to reach after the cast steel base of precision casting and the tungsten carbide of nickel-base cladding the metallurgical attitude composite bed of fully fully mutually molten shape; The cast steel base of wherein said screwing element precision casting is the medium carbon steel base base of precision casting; Described tungsten carbide of nickel-base powder consist of cladded type tungsten carbide of nickel-base powder; Described screwing element alloy layer thickness is 1~2.5mm, and the thickness of mutual crucible zone 〉=64 μ m;
Simultaneously, its manufacture method and technical process are as follows:
1) technical process for casting of steel billet
A, wax-pattern are made: according to the casting accuracy standard of steel billet, select warm wax in the good U.S. product, Australia produces zirconium ytterbium sand and makes the casting wax-pattern;
B, selection precision casting steel: according to the casting accuracy technical specifications of steel billet, the steel ingot that selector alloying billet quality requires;
C, intermediate frequency furnace melting: selected casting is dosed into the intermediate frequency furnace melting of heating with steel ingot, and stirs, Control for Kiln Temperature is at 1450 ℃;
D, accurate casting steel billet: the liquid steel aqueous fusion liquid with fully melting liquefaction and stir in the intermediate frequency furnace, water one by one and smash the wax-pattern steel billet;
E, the demoulding are deburred: the cast steel base until cast molding fully cools off the rear demoulding, removes the zirconium ytterbium sand and the cast steel base burr that remain on the cast steel base;
F, tempering: with the cast steel base screwing element of precision casting, internal stress is removed in tempering in 350 ℃ tempering stove, prevents hydrogen embrittlement;
G, polishing: will put into the polishing machine polishing through the cast steel base screwing element after the tempering, and remove hydrogenation skin and residual zirconium ytterbium sand impurity;
H, check: the cast steel base screwing element after will polishing is delivered check, and the qualified product vanning is stand-by;
2) spray welding process flow process
A, digital controlled lathe on the cast steel base screwing element is pressed drawing dimensional precision processing end flat and endoporus, upper milling machine is processed into the surfacing standardized component by the drawing dimensional precision;
B, with broaching machine on the surfacing standardized component of cast steel base screwing element, press drawing dimension precision requirement control endoporus spline;
C, the cast steel base screwing element that will draw the endoporus spline are put into the polishing machine polishing, remove product surface oxide skin and burr;
D, polished cast steel base screwing element is placed the nitrogen protection bucket, prevent that the product ingress of air from producing oxidation;
E, the cast steel base screwing element in the nitrogen protection bucket taken out penetrate rapidly on the splined shaft, after preheating on the spray bed, spraying tungsten carbide of nickel-base powder;
F, check: the screwing element to spraying tungsten carbide of nickel-base powder is tested, and lower road cladding operation is transferred in circulation behind the qualified product;
3) melting and coating process flow process
A, the screwing element that will spray tungsten carbide of nickel-base are packed into and are treated cladding in the vacuum electric furnace;
B, fill nitrogen in the vacuum electric furnace of the spraying tungsten carbide of nickel-base screwing element of packing into, nitrogen pressure is 0.1kg/m 3
The vacuum electric furnace cladding temperature of c, tungsten carbide of nickel-base screwing element is 900-1100 ℃;
D, with the tungsten carbide of nickel-base screwing element tempering in tempering stove after the cladding, eliminate internal stress, prevent hydrogen embrittlement;
F, check: the tungsten carbide of nickel-base screwing element after cladding and the tempering is estimated and instrument testing the lower road of qualified product vanning circulation machining processes;
4) mechanical processing technique flow process
A, will carry out through the screwing element salable product of fusion covered nickel base carbide layers line cutting processing end face;
B, will be through lathe in machining end face and inner bore chamfering on the line cutting rear thread element;
C, will be through CNC milling machine processing overall dimensions on the screwing element after the lathe in machining;
D, will roughly grind through numerically control grinder on the screwing element after the CNC milling machine processing, half correct grinding, ground finish, be taken up in order of priority with 80#, 100#, 120# grinding wheel;
E, inspection after construction: to testing one by one, detect, shunt qualified and substandard product through the screwing element product after cladding and the mechanical workout;
F, to check, detect qualified cladding type screwing element product and carry out the class wrapping warehouse-in.
CN 201010205228 2010-06-22 2010-06-22 Full-coating cladding thread element for parallel double-screw extruder Expired - Fee Related CN102230173B (en)

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CN106702304B (en) * 2017-01-22 2019-06-11 石家庄市藁城区北创刀具有限公司 A kind of wearing layer preparation method of greenfeed dedicated tool
CN113147150B (en) * 2021-04-16 2021-10-19 大庆市华禹石油机械制造有限公司 Manufacturing process of thread of oil pipe without sticking

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JPS61266209A (en) * 1985-05-20 1986-11-25 Hitachi Metals Ltd Non-magnetic corrosion-resistant and abrasion-resistant screw
JP2008001081A (en) * 2006-05-22 2008-01-10 Fujifilm Corp Cellulose-based resin film and its manufacturing method

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Publication number Priority date Publication date Assignee Title
CN1258323A (en) * 1997-05-28 2000-06-28 保罗·卡伦 Sintered mechanical part with abrasionproof surface and method for producing same

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JP昭61-266209A 1986.11.25
苏炳基等.高耐磨耐蚀SJ-45B型塑料挤出机螺杆的喷焊新工艺.《精密制造与自动化》.1982,(第2期),第56~59页. *
霍影等.稀土对真空熔覆Ni基/WC涂层组织结构的影响.《材料保护》.2005,第38卷(第8期),第13~15页. *
黄志强等.超音速火焰喷涂强化物探螺旋钻杆试验研究.《物探装备》.2007,第17卷(第3期),第167~170页. *

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