CN105441789A - Large circular knife and manufacturing method thereof - Google Patents
Large circular knife and manufacturing method thereof Download PDFInfo
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- CN105441789A CN105441789A CN201610022400.1A CN201610022400A CN105441789A CN 105441789 A CN105441789 A CN 105441789A CN 201610022400 A CN201610022400 A CN 201610022400A CN 105441789 A CN105441789 A CN 105441789A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D35/00—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools
- B23D35/001—Tools for shearing machines or shearing devices; Holders or chucks for shearing tools cutting members
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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
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
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- 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
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- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- 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
- C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
The invention discloses a large circular knife and a manufacturing method thereof, belongs to the field of circular knives, and solves the problems of low flatness, uneven hardness, a short service life and a high production rejection rate in a current large circular knife production process. The manufacturing method for the large circular knife comprises the following thermal treatment steps: normalizing, horizontally charging the large circular knife subjected to rough machining for heating; hitting the surface of the large circular knife; cooling the large circular knife to the room temperature; normalizing; carrying out oil quenching after heating; leveling by use of a press; fixing by use of a clamp; tempering; carrying out subzero treatment; and checking. The method disclosed by the invention can improve the flatness of the large circular knife and can increase the product qualified rate, so that the service life of the product is long, and the purposes of saving the production cost and improving the production efficiency can be achieved.
Description
Technical field
The invention belongs to dise knife field, more particularly, relate to a kind of large dise knife and manufacture method thereof.
Background technology
Circular knife, i.e. circular shear blade.The circular shape of profile, general circular knife is applied in mechanical means, mainly cuts, the machining functions such as deburring.Circular knife all has interstitial hole usually, and object to make it be fixed in mechanical means, thus reach cutting function.Wherein also have a lot of money circular blade edge to be dentation (flat tooth, pointed tooth, irregular dentation), the edge of a knife put the first edge on a knife or a pair of scissors two-sided, one side, do not put the first edge on a knife or a pair of scissors three kinds.Large dise knife is the one of circular knife, because its diameter is larger relative to general circular knife, therefore is referred to as large dise knife.Large dise knife is generally used for tubulation production line, the pipelines such as cutting paper tube, steel pipe, copper pipe, aluminum pipe; The diameter of large dise knife is generally more than half meter, and thickness generally only has several millimeters, due to the combination of this major diameter and ultrathin, large dise knife is made to there will be various defect in process of production, wherein most important defect is mainly manifested in large dise knife surface irregularity, and planeness is poor, and as a kind of cutting tool, the height direct relation of planeness cutting accuracy and cutting efficiency, so the not high problem of planeness is urgent problem in large dise knife manufacturing process.For solving this problem, prior art generally adopts pressing machine to carry out pressing process to large dise knife workpiece, but this method easily causes workpiece to ftracture, and condemnation factor is high.
Chinese Patent Application No. 201510400137.0, the patent application document in publication date on September 30th, 2015, discloses a kind of flat dise knife and manufacture method thereof, belongs to tool sharpening field.The flat dise knife of this invention comprises centre hole, cutterhead and blade, centre hole is positioned at the center of cutterhead, and blade is positioned on the outer shroud of cutterhead, and the outer shroud of blade is provided with edge, the blade angle δ of described edge is 13 ~ 18 °, and cutterhead is provided with threaded hole and open holes.The flat dise knife of this invention adopts the alloy material of special elements composition to obtain through step manufactures such as rough forging, isothermal spheroidizing, preliminary working, thermal treatment, corase grind and smoothing, tempering, deep processings under the strict processing condition controlled, there is when meeting sharpness requirement very strong wear resisting property, long service life, edge after a long time use abrasion loss is little, does not burst apart.The open circular knife manufacture method of this patent application goes for the less circular knife of diameter, and when being applied to diameter with the dise knife that thickness difference is larger, then easily there is poor flatness, the phenomenon of surface irregularity, and in order to improve planeness, adopt general pressing machine to flatten process, certainly will conforming product rate be reduced, waste a large amount of production costs.
In addition, because large dise knife can produce thermal distortion when normally using, if its hardness uneven (existing large dise knife hardness is generally in HRC30 ~ 55), be easy to temperature distortion, and can only scrap process when being out of shape serious, work-ing life is very low.
Summary of the invention
The problem that 1, will solve
Easily occur that planeness is low, hardness is uneven for existing large dise knife production process, work-ing life is short, the problem that manufacturing scrap rate is high, the invention provides a kind of large dise knife and manufacture method thereof, the planeness of large dise knife can be improved, improve conforming product rate, long product lifecycle simultaneously, can reach and save production cost, the object of enhancing productivity.
2, technical scheme
For solving the problem, the present invention adopts following technical scheme.
A kind of great circle cutter manufacturing method, comprises following heat treatment step:
1) normalizing, the horizontal shove charge of large dise knife after roughing being completed is heated to 860 ~ 900 DEG C, heating coefficient 1.4 ~ 1.6min/mm, comes out of the stove after insulation 8 ~ 10min;
2) by step 1) in come out of the stove after large dise knife be placed on metal platform, metal hammer flattener is adopted to impact large dise knife surface n time, n equals ε * D* (S/s) and rounds, wherein ε is 1/10th of large dise knife material Poisson's ratio, D is the thickness of large dise knife, S is large dise knife surface-area, and s is the area of metal hammer flattener impact surface; Overturn large dise knife, impact another surface n of large dise knife time;
3) normalizing, by step 2) large dise knife after impact puts into 720 DEG C of box-type furnace inside holding 2h, then stove is chilled to less than 500 DEG C, comes out of the stove;
4) by step 3) in come out of the stove after large dise knife pressing machine smooth;
5) by step 4) in smoothing after large dise knife be cooled to room temperature, fix with fixture;
6) tempering, by step 5) fix with fixture after large dise knife shove charge be heated to 190 ~ 210 DEG C, heating coefficient 1.4 ~ 1.6min/mm, insulation 2h, come out of the stove, be cooled to room temperature;
7) quench, by step 6) in be cooled to room temperature after the horizontal shove charge of large dise knife be heated to 860 ~ 900 DEG C, heating coefficient 1.4 ~ 1.6min/mm, insulation 3 ~ 5min after come out of the stove, vertical immersion oil, is cooled to 130 ~ 150 DEG C of taking-ups;
8) deep cooling, by step 7) in the large dise knife that takes out be cooled to room temperature after put into deepfreeze stove deep cooling to-120 ~-140 DEG C, after insulation 4h, be warming up to-25 ~-35 DEG C and come out of the stove;
9) by step 8) in come out of the stove after large dise knife be warming up to room temperature after take out in fixture, verification.
Preferably, described step 2) in the surfaceness of the surfaceness of metal platform and the impact surface of metal hammer flattener be Ra0.8 ~ Ra1.6; The hardness of the surface hardness of metal platform and the impact surface of metal hammer flattener is 56 ~ 60HRC.
Preferably, described step 2) in the dynamics F=KD that impacts each time, wherein K gets 90 ~ 100N/mm.
Preferably, described step 4) in hydropress smoothing adopt pressure be 100t.
Preferably, described step 7) in quenchant be 32# machine oil.
Preferably, described step 1), 7) in heating stove be the box resistive band stove of 90kw; Described step 6) in tempering equipment be 90kw air cycle resistive band stove; Described step 8) in deep freeze refrigeration plant be 0 ~-196 DEG C of sub-zero treatment stove.
Preferably, roughing step before also comprising thermal treatment: 1) plasma Linear cut is switched to semi-finished dimensions; 2) boring or tooth punching; 3) fin cutting, checks material crack, interlayer defect.
Preferably, described large dise knife starting material adopt hot-rolled sheet, and its Ingredient percent is C:0.60 ~ 0.70, Si:0.11 ~ 0.37, Mn:0.90 ~ 1.20, S≤0.035, P≤0.035, Cr≤0.25, Ni≤0.25, Cu≤0.25.
A kind of large dise knife, adopts aforesaid method to make.
Preferably, described large dise knife starting material adopt hot-rolled sheet, and its Ingredient percent is C:0.60 ~ 0.70, Si:0.11 ~ 0.37, Mn:0.90 ~ 1.20, S≤0.035, P≤0.035, Cr≤0.25, Ni≤0.25, Cu≤0.25.
3, beneficial effect
Compared to prior art, beneficial effect of the present invention is:
(1) first the large dise knife after roughing is carried out normalizing treatment by method of the present invention, can play the machining stress eliminated large dise knife work in-process and produce when roughing; After normalizing treatment is come out of the stove, according to large dise knife thickness, surface area parameters, large dise knife surface is carried out to the impact of quantitative number of times, large dise knife inner integument body of light after can making roughing within the shortest time adds the maximization of point-like pearlitic structure and changes into the pearlitic structure that grain size is 2.5 ~ 6 grades, better crystal grain thinning, eliminate the defects such as the as cast condition of large dise knife blank in smelting process is loose, optimize heterogeneous microstructure; Quantification impact improves production efficiency, saves the time, reduces labour intensity; In addition, preferably the present invention impacts dynamics and also adopts quantification to arrange, and can improve impact efficiency further, reduce unnecessary time and the waste of labor force, reach the optimization of resources alocation;
(2) the large dise knife in method of the present invention after impact produces machining stress, again adopts normalising step to eliminate its machining stress for this reason, optimizes its microtexture;
(3) method of the present invention adopts pressing machine to smooth process again after impact, normalizing, then large dise knife can be made successfully to avoid the cracking occurred in smoothing process, reduce condemnation factor, improve large dise knife quality;
(4) sub-zero treatment is carried out again after method tempering of the present invention, high strength martensitic tissue is fully changed in the residual austenite body tissue making its original tempered martensite add 8% ~ 20%, abundant elimination residualinternal stress, yielding and generation that is problem of Cracking of being heated when reducing the use of finished product great circle cutter;
(5) the large dise knife hardness that the inventive method makes adds 2 ~ 3HRC, adds its overall wear resistance; Extend 8 ~ 10 times work-ing life;
(6) adopt fixture to be fixed large dise knife in the inventive method, ensure that large dise knife not to deform bounce-back after pressing machine smoothing;
(7) the inventive method improves yield rate, shortens in the smoothing technologic time, improves production efficiency; The large dise knife made shows after cutting test, and performance is more excellent, and quality is better.
Accompanying drawing explanation
Fig. 1 is the structural representation of product of the present invention;
Fig. 2 is the side-view of Fig. 1;
In figure: 1, blade body; 2, fixed orifices; 3, blade; 4, open holes.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1
As depicted in figs. 1 and 2, a kind of large dise knife, comprises blade body 1, fixed orifices 2, blade 3 and open holes 4; Its specification is φ 610 × 70 × 5.5mm; Direct quenching after this large dise knife prior heat treatment process generally adopts normalizing, cool tempering again, this method makes workpiece, and deflection is comparatively large after quenching, is mainly manifested in large dise knife surface irregularity, poor flatness, follow-up grinding machine allowance for finish is large, waste material, and process period extends; After quenching Step, increase smoothing step after improvement, but adopt the large dise knife after pressing machine smoothing easily to ftracture, and the product that ftractures cannot carry out subsequent handling, causes condemnation factor high.For solving the problem, the present invention adopts following technical scheme.
A kind of great circle cutter manufacturing method, the steps include:
1) starting material adopt hot-rolled sheet, its Ingredient percent is C:0.60 ~ 0.70%, Si:0.11 ~ 0.37%, Mn:0.90 ~ 1.20%, S≤0.035%, P≤0.035%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, and surplus is Fe;
2) by step 1) in starting material carry out roughing: be switched to work in-process as shown in Figure 1 with plasma Linear cut; Again blade body 1 is holed, processing fixed orifices 2 and open holes 4; Fin cutting, checks material crack, interlayer defect;
3) normalizing, by step 2) in roughing complete after the box resistive band stove of the horizontally mounted 90kw of large dise knife be heated to 880 DEG C, adjustments heating coefficient is 1.5min/mm, is incubated after 9min and comes out of the stove;
4) by step 3) in come out of the stove after large dise knife be placed on that surfaceness is Ra0.8, surface hardness is the metal platform of 56HRC, adopt the area s=29 of impact surface
2the metal hammer flattener that π, surfaceness are Ra0.8, surface hardness is 56HRC impacts frequency n=ε * D* (S/s)=0.0288 × 5.5 × { [(610/2), large dise knife surface
2π]/28
2π } ≈ 18.79, round 19 times, overturn large dise knife, impact another surface of large dise knife 19 times; Impact dynamics F=KD=95 × 5.5N=522.5N each time;
5) normalizing, by step 4) large dise knife after impact puts into 720 DEG C of box-type furnace inside holding 2h, then stove is chilled to less than 500 DEG C, comes out of the stove;
6) by step 5) in come out of the stove after large dise knife pressing machine smooth, smoothing pressure is 100t;
7) by step 6) in smoothing after large dise knife be cooled to room temperature, fix with fixture;
8) tempering, by step 7) fix with fixture after large dise knife put into 90kw air cycle resistive band stove, be heated to 200 DEG C, adjustment heating coefficient is 1.5min/mm, insulation 2h, come out of the stove, be cooled to room temperature;
9) quench, by step 8) in be cooled to room temperature after large dise knife level dress resistive band stove as box in 90kw be heated to 880 DEG C, adjustment heating coefficient is 1.5min/mm, comes out of the stove, vertically put into 32# machine oil, be cooled to 140 DEG C of taking-ups after being incubated 4min;
10) deep cooling, by step 9) in the large dise knife that takes out be cooled to room temperature after put into 0 ~-196 DEG C of deepfreeze stove deep cooling to-130 DEG C, after insulation 4h, be warming up to-30 DEG C and come out of the stove;
11) by step 10) in come out of the stove after large dise knife be warming up to room temperature after take out in fixture, verification;
12) precision work; Large dise knife completes.
The manufacture method of the large dise knife of the present invention carries out the impact of quantitative number of times after normalizing to large dise knife surface according to large dise knife thickness, surface area parameters, large dise knife inner integument body of light after can making roughing within the shortest time adds the maximization of point-like pearlitic structure and changes into the pearlitic structure that grain size is 2.5 ~ 6 grades, better crystal grain thinning, plays the defect such as eliminate that the as cast condition of large dise knife blank in smelting process is loosened simultaneously, optimizes the effect of heterogeneous microstructure; Quantification impact improves production efficiency, saves the time, reduces labour intensity; Impact dynamics also adopts quantification to arrange, and can improve impact efficiency further, reduces unnecessary time and the waste of labor force, reaches the optimization of resources alocation; And normalizing treatment is carried out again after impact, the machining stress that impact step produces can be eliminated, optimize the microtexture of large dise knife further; Large dise knife after above-mentioned steps adopts pressing machine to smooth process again, then large dise knife can be made successfully to avoid the cracking occurred in smoothing process, reduce condemnation factor, improve large dise knife quality; Large dise knife after smoothing carries out tempering, sub-zero treatment is carried out again after tempering, high strength martensitic tissue is fully changed in the residual austenite body tissue making its original tempered martensite add 8% ~ 20%, abundant elimination residualinternal stress, reduce yielding and generation that is problem of Cracking of being heated when finished product great circle cutter uses, sub-zero treatment simultaneously makes the hardness of large dise knife add 2 ~ 3HRC, improve the overall wear resistance of large dise knife, improve intensity and the toughness of large dise knife, make it in use can keep good linearity;
Adopt the large dise knife after the thermal treatment of embodiment method, through inspection, its deflection is 0.10mm ~ 0.30mm, meets subsequent fine processing request; The large dise knife hardness that present method manufactures is high and even, and hardness reaches 56 ~ 60HRC; Not easily because of temperature distortion in using, work-ing life, more general dise knife improve 8 ~ 10 times; Adopt the method to make large dise knife, flawless after smoothing, condemnation factor is zero.
Embodiment 2
A kind of great circle cutter manufacturing method, the steps include:
1) starting material adopt hot-rolled sheet, its Ingredient percent is C:0.60 ~ 0.70%, Si:0.11 ~ 0.37%, Mn:0.90 ~ 1.20%, S≤0.035%, P≤0.035%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, and surplus is Fe;
2) by step 1) in starting material carry out roughing: be switched to work in-process as shown in Figure 1 with plasma Linear cut; Again blade body 1 is holed, processing fixed orifices 2 and open holes 4; Fin cutting, checks material crack, interlayer defect;
3) normalizing, by step 2) in roughing complete after the box resistive band stove of the horizontally mounted 90kw of large dise knife be heated to 860 DEG C, adjustments heating coefficient is 1.4min/mm, is incubated after 8min and comes out of the stove;
4) by step 3) in come out of the stove after large dise knife be placed on that surfaceness is Ra1.6, surface hardness is the metal platform of 60HRC, adopt the area s=29 of impact surface
2the metal hammer flattener that the surfaceness of π, impact surface is Ra1.6, surface hardness is 60HRC impacts large dise knife surface 19 times, overturns large dise knife, impacts another surface of large dise knife 19 times;
5) normalizing, by step 4) large dise knife after impact puts into 720 DEG C of box-type furnace inside holding 2h, then stove is chilled to less than 500 DEG C, comes out of the stove;
6) by step 5) in come out of the stove after large dise knife pressing machine smooth, smoothing pressure is 100t;
7) by step 6) in smoothing after large dise knife be cooled to room temperature, fix with fixture;
8) tempering, by step 7) fix with fixture after large dise knife put into 90kw air cycle resistive band stove, be heated to 190 DEG C, adjustment heating coefficient is 1.4min/mm, insulation 2h, come out of the stove, be cooled to room temperature;
9) quench, by step 8) in be cooled to room temperature after large dise knife level dress resistive band stove as box in 90kw be heated to 860 DEG C, adjustment heating coefficient is 1.4min/mm, comes out of the stove, vertically put into 32# machine oil, be cooled to 130 DEG C of taking-ups after being incubated 3min;
10) deep cooling, by step 9) in the large dise knife that takes out be cooled to room temperature after put into 0 ~-196 DEG C of deepfreeze stove deep cooling to-120 DEG C, after insulation 4h, be warming up to-25 DEG C and come out of the stove;
11) by step 10) in come out of the stove after large dise knife be warming up to room temperature after take out in fixture, verification;
12) precision work; Large dise knife completes.
Adopt the large dise knife after the thermal treatment of the present embodiment method, through inspection, its deflection is 0.10mm ~ 0.30mm, meets subsequent fine processing request; The large dise knife hardness that present method manufactures is even, is 56 ~ 60HRC; Not easily because of temperature distortion in using, work-ing life, more general dise knife improve 6 ~ 8 times; Adopt the method to make large dise knife, the product that crackle occurs after smoothing is less, and condemnation factor is 0.1 ~ 0.5%.
Embodiment 3
A kind of great circle cutter manufacturing method, the steps include:
1) starting material adopt hot-rolled sheet, its Ingredient percent is C:0.60 ~ 0.70%, Si:0.11 ~ 0.37%, Mn:0.90 ~ 1.20%, S≤0.035%, P≤0.035%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, and surplus is Fe;
2) by step 1) in starting material carry out roughing: be switched to work in-process as shown in Figure 1 with plasma Linear cut; Again blade body 1 is holed, processing fixed orifices 2 and open holes 4; Fin cutting, checks material crack, interlayer defect;
3) normalizing, by step 2) in roughing complete after the box resistive band stove of the horizontally mounted 90kw of large dise knife be heated to 900 DEG C, adjustments heating coefficient is 1.6min/mm, is incubated after 10min and comes out of the stove;
4) by step 3) in come out of the stove after large dise knife be placed on that surfaceness is Ra0.8, surface hardness is the metal platform of 56HRC, adopt the area s=29 of impact surface
2the metal hammer flattener that the surfaceness of π, impact surface is Ra0.8, surface hardness is 56HRC impacts large dise knife surface 19 times, overturns large dise knife, impacts another surface of large dise knife 19 times;
5) normalizing, by step 4) large dise knife after impact puts into 720 DEG C of box-type furnace inside holding 2h, then stove is chilled to less than 500 DEG C, comes out of the stove;
6) by step 5) in come out of the stove after large dise knife pressing machine smooth, smoothing pressure is 100t;
7) by step 6) in smoothing after large dise knife be cooled to room temperature, fix with fixture;
8) tempering, by step 7) fix with fixture after large dise knife put into 90kw air cycle resistive band stove, be heated to 210 DEG C, adjustment heating coefficient is 1.6min/mm, insulation 2h, come out of the stove, be cooled to room temperature;
9) quench, by step 8) in be cooled to room temperature after large dise knife level dress resistive band stove as box in 90kw be heated to 900 DEG C, adjustment heating coefficient is 1.6min/mm, comes out of the stove, vertically put into 32# machine oil, be cooled to 150 DEG C of taking-ups after being incubated 5min;
10) deep cooling, by step 9) in the large dise knife that takes out be cooled to room temperature after large dise knife put into 0 ~-196 DEG C of deepfreeze stove deep cooling to-140 DEG C, after insulation 4h, be warming up to-35 DEG C and come out of the stove;
11) by step 10) in come out of the stove after large dise knife be warming up to room temperature after take out in fixture, verification;
12) precision work; Large dise knife completes.
Adopt the large dise knife after the thermal treatment of the present embodiment method, through inspection, its deflection is 0.10mm ~ 0.30mm, meets subsequent fine processing request; The large dise knife hardness that present method manufactures is even, is 56 ~ 60HRC; Not easily because of temperature distortion in using, work-ing life, more general dise knife improve 5 ~ 7 times; Adopt the method to make large dise knife, the product that crackle occurs after smoothing is less, and condemnation factor is 0.5 ~ 1%.
Claims (10)
1. a great circle cutter manufacturing method, comprises following heat treatment step:
1) normalizing, the horizontal shove charge of large dise knife after roughing being completed is heated to 860 ~ 900 DEG C, heating coefficient 1.4 ~ 1.6min/mm, comes out of the stove after insulation 8 ~ 10min;
2) by step 1) in come out of the stove after large dise knife be placed on metal platform, metal hammer flattener is adopted to impact large dise knife surface n time, n equals ε * D* (S/s) and rounds, wherein ε is 1/10th of large dise knife material Poisson's ratio, D is the thickness of large dise knife, S is large dise knife surface-area, and s is the area of metal hammer flattener impact surface; Overturn large dise knife, impact another surface n of large dise knife time;
3) normalizing, by step 2) large dise knife after impact puts into 720 DEG C of box-type furnace inside holding 2h, then stove is chilled to less than 500 DEG C, comes out of the stove;
4) by step 3) in come out of the stove after large dise knife pressing machine smooth;
5) by step 4) in smoothing after large dise knife be cooled to room temperature, fix with fixture;
6) tempering, by step 5) fix with fixture after large dise knife shove charge be heated to 190 ~ 210 DEG C, heating coefficient 1.4 ~ 1.6min/mm, insulation 2h, come out of the stove, be cooled to room temperature;
7) quench, by step 6) in be cooled to room temperature after the horizontal shove charge of large dise knife be heated to 860 ~ 900 DEG C, heating coefficient 1.4 ~ 1.6min/mm, insulation 3 ~ 5min after come out of the stove, vertical immersion oil, is cooled to 130 ~ 150 DEG C of taking-ups;
8) deep cooling, by step 7) in the large dise knife that takes out be cooled to room temperature after put into deepfreeze stove deep cooling to-120 ~-140 DEG C, after insulation 4h, be warming up to-25 ~-35 DEG C and come out of the stove;
9) by step 8) in come out of the stove after large dise knife be warming up to room temperature after take out in fixture, verification.
2. a kind of great circle cutter manufacturing method according to claim 1, is characterized in that: described step 2) in the surfaceness of the surfaceness of metal platform and the impact surface of metal hammer flattener be Ra0.8 ~ Ra1.6; The hardness of the surface hardness of metal platform and the impact surface of metal hammer flattener is 56 ~ 60HRC.
3. a kind of great circle cutter manufacturing method according to claim 1, is characterized in that: described step 2) in the dynamics F=KD that impacts each time, wherein K gets 90 ~ 100N/mm.
4. a kind of great circle cutter manufacturing method according to claim 1, is characterized in that: described step 4) in hydropress smoothing adopt pressure be 100t.
5. a kind of great circle cutter manufacturing method according to claim 1, is characterized in that: described step 7) in quenchant be 32# machine oil.
6. a kind of great circle cutter manufacturing method according to claim 1, is characterized in that: described step 1), 7) in heating stove be the box resistive band stove of 90kw; Described step 6) in the stove of tempering be 90kw air cycle resistive band stove; Described step 8) in the stove of deep cooling be 0 ~-196 DEG C of sub-zero treatment stove.
7. a kind of great circle cutter manufacturing method according to claim 1 ~ 6 any one, is characterized in that: roughing step before also comprising thermal treatment: 1) plasma Linear cut is switched to semi-finished dimensions; 2) boring or tooth punching; 3) fin cutting, checks material crack, interlayer defect.
8. a kind of great circle cutter manufacturing method according to claim 1 ~ 6 any one, it is characterized in that: described large dise knife starting material adopt hot-rolled sheet, and its Ingredient percent is C:0.60 ~ 0.70, Si:0.11 ~ 0.37, Mn:0.90 ~ 1.20, S≤0.035, P≤0.035, Cr≤0.25, Ni≤0.25, Cu≤0.25.
9. a large dise knife, is characterized in that: adopt method according to claim 1 to make.
10. the large dise knife of one according to claim 9, it is characterized in that: described large dise knife starting material adopt hot-rolled sheet, and its Ingredient percent is C:0.60 ~ 0.70, Si:0.11 ~ 0.37, Mn:0.90 ~ 1.20, S≤0.035, P≤0.035, Cr≤0.25, Ni≤0.25, Cu≤0.25.
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Denomination of invention: A large round knife and its manufacturing method Effective date of registration: 20201104 Granted publication date: 20170524 Pledgee: Hengshan Ma'anshan finance Company limited by guarantee Pledgor: ANHUI FENGLIRUI BLADE MANUFACTURE Co.,Ltd. Registration number: Y2020980007527 |
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