CN117047063A - Special manufacturing method for split combined type collar assembly high-speed steel roller - Google Patents
Special manufacturing method for split combined type collar assembly high-speed steel roller Download PDFInfo
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- CN117047063A CN117047063A CN202310965891.3A CN202310965891A CN117047063A CN 117047063 A CN117047063 A CN 117047063A CN 202310965891 A CN202310965891 A CN 202310965891A CN 117047063 A CN117047063 A CN 117047063A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 229910000997 High-speed steel Inorganic materials 0.000 title claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 81
- 238000005266 casting Methods 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 13
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 238000003754 machining Methods 0.000 claims description 26
- 229920000742 Cotton Polymers 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005242 forging Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 8
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 229910001141 Ductile iron Inorganic materials 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- 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
-
- 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
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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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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The application discloses a split combined type collar assembled high-speed steel roller and a special manufacturing method thereof, wherein the high-speed steel roller comprises a roller body working layer and a roller shaft which are assembled, the roller body working layer comprises an effective rolling part and an auxiliary rolling part which are distributed at intervals, and the split combined type collar assembled high-speed steel roller special manufacturing method comprises the following steps: s1, centrifugally compounding and casting an effective rolling part; s2, carrying out integral centrifugal casting on the auxiliary rolling part; s3, preparing a roll shaft; s4, assembling the collar in a combined mode and finishing a finished product. The application is suitable for manufacturing large-sized grooves and angle steel male rolls, the auxiliary rolling part does not participate in steel rolling, does not bear the transmission of axial force, only plays a role in fixing and positioning the effective rolling part, is not suitable for occasions of centrifugal composite manufacturing, enables the high alloy outer layer to be softened and annealed after independent casting, greatly improves the manufacturing safety and the processing efficiency, and solves the cracking risk in the heat treatment and use processes and the manufacturing and use feasibility problem by processing the high alloy outer layer into independent smaller parts.
Description
Technical Field
The application relates to the technical field of metallurgical roller casting, in particular to a split combined type collar assembly high-speed steel roller and a special manufacturing method thereof.
Background
The production materials of the middle and finish rolling type steel rolls at the present stage are mainly static integral and centrifugal casting NiCrMo pearlitic ductile iron (hardness 58-63 HSD) and NiCrMo bainitic ductile iron (63-68 HSD) materials of traditional annealing heat treatment; the 160-220CrNiMo alloy semisteel or graphite steel roller (with the hardness of 55-60 HSD) with open-pore quenching is used for part of oversized steel. Rolling characteristics of the section steel (mainly comprising angle steel and channel steel): 1. kong Xingshen (30-200 mm), the thickness of the working layer of the roller is required to be thick (60-300 mm); 2. the rolling material is cooled unevenly at the edge part and the edge angle of a rolling schedule, so that the edge part, the edge angle and other parts of the rolling roll are worn quickly; the whole service life of the roller is lower, and the production efficiency is lower due to frequent roller replacement and roller repair; 3. because the traditional ductile iron roller has a thicker working layer, the surface of the working layer is naturally cooled and solidified by the roller manufacturing process, and the difference between the structure and hardness of the bottom of the working layer is larger, so that the whole ductile iron roller has lower service life and poorer surface quality in the middle and later stages.
With the continuous progress of the roller materials, the high alloy roller materials such as high-speed steel, high-chromium iron and the like can be applied to rod and wire rolling mills with low requirements (40-70 mm) of the rolling materials on the thickness of the working layer, and good use effects can be obtained. However, for the roller with the thickness of the centrifugal layer which cannot meet the requirement of more than or equal to 158mm required by the centrifugal composite casting pouring method, the combined assembly method of the centrifugal composite casting shaft sleeve is required to be used for production, the total thickness of part of the product transition layer and the middle layer is almost zero, if the outer layer is manufactured integrally (cast, heat treatment and combined assembly) in a whole, the cracking risk is high, and in the using process, too large stress cracking in the working layer is easy to occur due to the temperature difference between a hole pattern and a non-using part, so that corresponding technical measures must be adopted from the manufacturing method and the structure.
Disclosure of Invention
According to the technical problems to be solved, the split combined type collar assembled high-speed steel roller and the special manufacturing method thereof are provided, and the structural stress of the roller is reduced on one hand by changing the structural mode of the roller; and secondly, the influence and damage to the stress of the whole roller when the roller is locally impacted by heat are reduced through the structure.
In order to achieve the above purpose, the application discloses a special manufacturing method of a split combined type collar assembled high-speed steel roller, wherein the high-speed steel roller comprises a roller body working layer and a roller shaft which are assembled, the roller body working layer comprises an effective rolling part and an auxiliary rolling part which are distributed at intervals, and the special manufacturing method of the split combined type collar assembled high-speed steel roller comprises the following steps:
s1, centrifugally and compositely casting an effective rolling part, combining all parts of the effective rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of a casting mould, preparing the casting mould, hanging the casting mould, and completing casting;
s2, integrally centrifugally casting the auxiliary rolling part, combining all parts of the auxiliary rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of the casting mould, preparing the casting mould, hanging the casting mould, and completing casting;
s3, preparing a roll shaft, namely forging 42CrMo alloy forged steel, and performing heat treatment after forging;
s4, assembling a collar in a combined mode, finely machining a finished product, wherein a machined roll body working layer and a forged roll shaft are subjected to hot assembly, the room-temperature roll shaft is vertically arranged upwards in an operation side, an effective rolling part and an auxiliary rolling part are sequentially arranged, the roll body is pre-tightened after assembly is completed, and the roll body is tightly wrapped by heat-insulating cotton and slowly cooled to room temperature, and is further locked on a machining machine tool to finish fine machining.
Further, the effective rolling part is at least provided with two groups, the auxiliary rolling part is at least provided with three groups, the effective rolling part comprises a first working ring and a second working ring, and the auxiliary rolling part comprises a positioning ring far away from the operation side of the roll shaft, an intermediate auxiliary ring positioned between the first working ring and the second working ring and a locking ring positioned at the other side of the second working ring.
Further, positioning pins are arranged at positions corresponding to the radial positions of the locking rings and the roll shafts.
Furthermore, the centrifugal composite casting of the effective rolling part in the step S1 specifically comprises the following steps:
s11, casting an outer layer molten metal of an effective rolling part, namely casting the outer layer molten metal by adopting a high-speed steel molten metal with chemical components of C1.6-2.3%, si0.4-0.8%, mn0.4-1.1%, cr4-8%, ni0.3-1.0%, mo3-5.5%, V3-5.5% and W0.5-4.0, smelting and deoxidizing and purifying to control harmful elements P less than or equal to 0.035%, S less than or equal to 0.03% and O less than or equal to 20PPM, discharging at 1580deg.C, standing for 10-15 minutes, removing surface scum, and injecting the outer layer molten metal into an assembled high-speed rotating centrifugal casting mold with a mold temperature of 80-120deg.C through a casting hopper and a launder at 1450-1480deg.C;
s12, pouring high silica ink steel core metal liquid with chemical components of C1.2-1.8%, si2.4-2.8%, mn0.5-0.8%, P less than or equal to 0.035 and S less than or equal to 0.03 into a cavity when the outer layer metal liquid is in a semi-solid state, namely before approaching to a solidifying point T2, and the temperature T1 in the cavity meets T1=T2+50 ℃;
s13, after the core metal liquid is solidified, stopping the centrifuge at a temperature T3 of less than or equal to 1000 ℃ in an inner hole of a cavity, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the position, slowly cooling to room temperature, and opening the box for annealing;
s14, processing the annealed high-speed steel into a required effective part shape, reserving heat treatment and machining allowance after heat treatment, and processing the contact surface of the inner hole and each ring piece to a required size according to the precision and the precision after heat treatment.
Furthermore, the integral centrifugal casting of the auxiliary rolling part in the step S2 specifically comprises the following steps:
s21, pouring molten metal at an auxiliary rolling part, namely pouring semisteel molten metal with chemical components of C1.4-1.6%, si0.4-0.8%, mn0.4-1.1%, cr0.8-1.2%, ni0.6-1.0% and Mo0.2-0.5%, controlling harmful elements P to be less than or equal to 0.035%, S to or equal to 0.03%, O to or less than 20PPM and tapping at 1580 ℃, standing for 10-15 minutes, removing surface scum, pouring the outer layer molten metal into an assembled centrifugal casting mold with high-speed rotation at the mold temperature of 80-120 ℃ through a pouring funnel and a launder at 1450-1480 ℃;
s22, after the molten metal is completely solidified, stopping the centrifuge at a temperature T4 of an inner hole of a cavity of the die, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the part, slowly cooling to room temperature, and opening a blank;
s23, machining the parts of the required auxiliary parts into shapes, reserving heat treatment and machining allowance after heat treatment, machining the contact surfaces of the inner holes and the ring parts to the required sizes according to the precision and the size after heat treatment, and in addition, operating the connecting parts of the locking rings at the side, the inner holes and the shaft, machining the corresponding parts of the rough threads and the shaft into transition fit, wherein the flange fit adopted by the connecting parts of the other inner holes and the shaft, including the positioning rings at the transmission side and the shaft end surface, is interference fit, and the interference is 0.6-0.7 per mill.
Still further, in S3 roller axle includes transmission side and operation side, and the transmission side is provided with flange structure with the connecting portion of holding ring, and the operation side is provided with the thick thread with the locking ring junction, and the screw thread direction is corresponding with operation side direction of rotation.
And further, heating the effective rolling part and the auxiliary rolling part in the step S4 to 200-250 ℃ and then performing heat assembly.
Compared with the prior art, the application has the beneficial effects that: the application discloses a special manufacturing method of a split combined type collar assembled high-speed steel roller, which is suitable for manufacturing large-specification grooves and angle steel male rollers, wherein auxiliary rolling parts do not participate in steel rolling, do not bear axial force transmission, only play roles in fixing and positioning effective rolling parts, and are not suitable for occasions of centrifugal composite manufacturing, so that a high alloy outer layer is softened and annealed after independent casting, the manufacturing safety and the processing efficiency are greatly improved, and the cracking risk in the heat treatment and use processes is solved by processing the high alloy outer layer into independent smaller parts, and the manufacturing and use feasibility problems are solved.
Since the casting is no longer limited by the diameter of the roll neck, the working layer can be cast thicker; the pass is decomposed into an effective rolling part and an auxiliary rolling part, so that the overall size (width) of the high alloy layer is reduced, and the risks of casting and heat treatment cracking are greatly reduced; the consumption of high alloy material is saved by 1/3-1/2, and the structure performance is improved
Drawings
The application will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a flow chart of a specific manufacturing method of the present application.
Fig. 2 is a flow chart of centrifugal composite casting of an effective rolling part according to the application.
FIG. 3 is a flow chart of the integral centrifugal casting of the auxiliary rolling part of the application.
FIG. 4 is a schematic diagram of a specific manufacturing method of the present application.
Fig. 5 is a schematic view of the structure of the roll of the present application.
In the figure: 11 is a first work ring; 12 is a second work ring; 21 is a positioning ring; 22 is an intermediate auxiliary ring; 23 is a locking ring; 231 is a locating pin; 31 is the driving side; 32 is the operation side.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In one embodiment of the application, taking a high-speed steel roller Phi 470 multiplied by 700 for a finish rolling K3 frame lower roller (male roller) for rolling 12# stainless steel channel steel as an example, the depth of a hole is 68mm, the thickness of a single-side effective working layer is required to be 108mm, the main journal size of the roller Phi 230mm, and the hardness of a finished product is required to be 78-85HSD.
The casting thickness of the outer layer of the roller=108 mm of unilateral effective use thickness, 10mm of safe thickness when scrapped, 10mm of corrosion thickness of the outer layer in the casting process and 10-20 mm of thickness of the transition layer are more than or equal to 148mm.
The maximum castable thickness of centrifugal composite casting= (the maximum excircle diameter of 470 mm-roll neck diameter of 230 mm-minimum roll neck casting allowance of 40 mm)/2=100 mm is adopted, namely the thickness of a centrifugal layer cannot meet the requirement of less than or equal to 148mm required by the centrifugal composite casting pouring method, so that the centrifugal composite casting shaft sleeve is produced by adopting a combined assembly method of the centrifugal composite casting shaft sleeve.
Because the thickness of the working layer of the roller is more than or equal to 108+10mm, the total thickness of the transition layer and the middle layer is almost zero according to the minimum assembly joint surface phi 230, if the outer layer is manufactured integrally, the risk of cracking is high, and in the using process, too large stress cracking in the working layer is easy to occur due to the temperature difference between a using hole pattern and a non-using part; accordingly, corresponding technical measures must be taken from the point of view of the manufacturing method and structure.
As shown in fig. 5, in this embodiment, two sets of effective rolling portions are provided, three sets of auxiliary rolling portions are provided, the effective rolling portions include a first working ring and a second working ring, and the auxiliary rolling portions include a positioning ring far away from the operation side of the roll shaft, an intermediate auxiliary ring located between the first working ring and the second working ring, and a locking ring located at the other side of the second working ring.
The application discloses a special manufacturing method of a split combined type collar assembled high-speed steel roller, which aims at the problems, and comprises the following steps of:
s1, centrifugally compounding and casting an effective rolling part, combining all parts of the effective rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of a casting mould, preparing and hanging the casting mould with precoated sand and finishing casting, wherein the concrete steps are as follows:
s11, casting an outer layer molten metal of an effective rolling part, namely casting the outer layer molten metal by adopting a high-speed steel molten metal with chemical components of C1.6-2.3%, si0.4-0.8%, mn0.4-1.1%, cr4-8%, ni0.3-1.0%, mo3-5.5%, V3-5.5% and W0.5-4.0, smelting and deoxidizing and purifying to control harmful elements P less than or equal to 0.035%, S less than or equal to 0.03% and O less than or equal to 20PPM, discharging at 1580deg.C, standing for 10-15 minutes, removing surface scum, and injecting the outer layer molten metal into an assembled high-speed rotating centrifugal casting mold with a mold temperature of 80-120deg.C through a casting hopper and a launder at 1450-1480deg.C;
s12, pouring high silica ink steel core metal liquid with chemical components of C1.2-1.8%, si2.4-2.8%, mn0.5-0.8%, P less than or equal to 0.035 and S less than or equal to 0.03 into a cavity when the outer layer metal liquid is in a semi-solid state, namely before approaching to a solidifying point T2, and the temperature T1 in the cavity meets T1=T2+50 ℃;
s13, after the core metal liquid is solidified, stopping the centrifuge at a temperature T3 of less than or equal to 1000 ℃ in an inner hole of a cavity, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the position, slowly cooling to room temperature, and opening the box for annealing;
s14, processing the annealed high-speed steel into a required effective part shape, reserving heat treatment and machining allowance after heat treatment, and processing the contact surface of the inner hole and each ring piece to a required size according to the precision and the precision after heat treatment.
The effective rolling part working layer is cast by centrifugal composite casting, and a centrifugal composite roll collar with a similar shape is cast and processed to a required shape; the roll body with the hole can be cast into a roll body with the hole by adopting a static integral casting mode to effectively roll the similar shape, or the roll body with the hole can be cast into a cylindrical part by adopting a static integral casting mode, and the cylindrical part is processed into the required shape.
S2, integrally centrifugally casting the auxiliary rolling part, combining all parts of the auxiliary rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of a casting mould, preparing and hanging the casting mould with precoated sand and completing casting, wherein the concrete steps are as follows:
s21, pouring molten metal at an auxiliary rolling part, namely pouring semisteel molten metal with chemical components of C1.4-1.6%, si0.4-0.8%, mn0.4-1.1%, cr0.8-1.2%, ni0.6-1.0% and Mo0.2-0.5%, controlling harmful elements P to be less than or equal to 0.035%, S to or equal to 0.03%, O to or less than 20PPM and tapping at 1580 ℃, standing for 10-15 minutes, removing surface scum, pouring the outer layer molten metal into an assembled centrifugal casting mold with high-speed rotation at the mold temperature of 80-120 ℃ through a pouring funnel and a launder at 1450-1480 ℃;
s22, after the molten metal is completely solidified, stopping the centrifuge at a temperature T4 of an inner hole of a cavity of the die, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the part, slowly cooling to room temperature, and opening a blank;
s23, machining the parts of the required auxiliary parts into shapes, reserving heat treatment and machining allowance after heat treatment, machining the contact surfaces of the inner holes and the ring parts to the required sizes according to the precision and the size after heat treatment, and in addition, operating the connecting parts of the locking rings at the side, the inner holes and the shaft, machining the corresponding parts of the rough threads and the shaft into transition fit, wherein the flange fit adopted by the connecting parts of the other inner holes and the shaft, including the positioning rings at the transmission side and the shaft end surface, is interference fit, and the interference is 0.6-0.7 per mill.
The auxiliary rolling part is formed by processing alloy steel or semisteel materials through corresponding heat treatment.
S3, preparing a roll shaft, namely adopting 42CrMo alloy forged steel, performing heat treatment after forging and forging, wherein the roll shaft comprises a transmission side and an operation side, a flange structure is arranged at the connection part of the transmission side and the positioning ring, a rough thread is arranged at the connection part of the operation side and the locking ring, and the thread spiral direction corresponds to the rotation direction of the operation side;
s4, assembling a collar in a combined mode, finely machining a finished product, wherein a machined roll body working layer and a forged roll shaft are subjected to hot assembly, a room-temperature roll shaft is vertically placed on the operation side of the roll shaft, a positioning ring, a first working ring, an intermediate auxiliary ring and a second working ring which are heated to 200-250 ℃ are sequentially arranged in the roll shaft, finally, a locking ring is arranged, the locking ring is initially pre-tightened after the assembly is completed, the roll body is tightly and slowly cooled to room temperature by a heat-insulating cotton bag, the locking ring is further locked on a machining machine tool, positioning pins are arranged on the locking ring and the roll shaft in the radial direction, and the roll shaft is machined to the finished product according to the shape and size precision requirements.
The working principle of the application, as shown in figure 4,
a is a schematic diagram of centrifugal composite casting of an effective rolling part, in the embodiment, the number of single dies is four, and the number of one-time casting molding is suitable for assembling two rollers;
b is a schematic diagram of the blank of the effective rolling part after unpacking and annealing heat treatment, and the cooled roll body working layer is taken out from the cavity;
c is a schematic diagram of the effective rolling part after rough machining heat treatment, and the blank is machined to a required shape;
d is a schematic diagram of hot rear semi-finishing of an effective rolling part, and finishing to a required size;
e is a schematic diagram for assisting in integral centrifugal casting of a rolling part, in the embodiment, the number of single dies is three, and the number of one-time casting molding is suitable for assembling a single roller;
f is a schematic diagram of a blank of an auxiliary rolling part after box opening and annealing heat treatment, and a roll body working layer after cooling is taken out from a cavity;
g is a schematic diagram of the auxiliary rolling part after rough machining heat treatment, and the blank is machined to a required shape;
h is a schematic diagram of hot rear semi-finishing of an auxiliary rolling part, and finishing is carried out to a required size;
i is a schematic diagram of roll shaft forging and heat treatment after forging;
j is a finish machining finished product diagram after the collar assembly.
The application discloses a special manufacturing method of a split combined type collar assembled high-speed steel roller, which is characterized in that for the roller, such as a lower roller for a groove and angle steel, the total thickness of a working layer and a transition layer cannot be realized by a centrifugal composite casting method, the working layer of the roller can be decomposed into an effective rolling part and an auxiliary rolling part for use after being assembled with a roller shaft, and the working layer can be cast thicker because the casting is not limited by the diameter of a roller neck any more; the pass is decomposed into an effective rolling part and an auxiliary rolling part, so that the overall size (width) of the high alloy layer is reduced, the risks of casting and heat treatment cracking are greatly reduced, the consumption of the high alloy material is saved by 1/3-1/2, and the tissue performance is improved.
The points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed; second, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The above examples are merely illustrative of the present application and are not meant to limit the scope of the present application, and all designs that are the same or similar to the present application are within the scope of the present application.
Claims (7)
1. The special manufacturing method of the split combined type collar assembled high-speed steel roller is characterized by comprising the following steps of:
s1, centrifugally and compositely casting an effective rolling part, combining all parts of the effective rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of a casting mould, preparing the casting mould, hanging the casting mould, and completing casting;
s2, integrally centrifugally casting the auxiliary rolling part, combining all parts of the auxiliary rolling part into a whole, casting into a cylindrical conjoined blank according to the actual size of the casting mould, preparing the casting mould, hanging the casting mould, and completing casting;
s3, preparing a roll shaft, namely forging 42CrMo alloy forged steel, and performing heat treatment after forging;
s4, assembling a collar in a combined mode, finely machining a finished product, wherein a machined roll body working layer and a forged roll shaft are subjected to hot assembly, the room-temperature roll shaft is vertically arranged upwards in an operation side, an effective rolling part and an auxiliary rolling part are sequentially arranged, the roll body is pre-tightened after assembly is completed, and the roll body is tightly wrapped by heat-insulating cotton and slowly cooled to room temperature, and is further locked on a machining machine tool to finish fine machining.
2. The special manufacturing method of the split combined type collar assembly high-speed steel roller according to claim 1, wherein at least two groups of effective rolling parts are arranged, at least three groups of auxiliary rolling parts are arranged, the effective rolling parts comprise a first working ring and a second working ring, and the auxiliary rolling parts comprise a positioning ring far away from the operation side of a roller shaft, an intermediate auxiliary ring arranged between the first working ring and the second working ring and a locking ring arranged at the other side of the second working ring.
3. A special manufacturing method of a split combined type collar assembly high-speed steel roller according to claim 2, wherein positioning pins are arranged at positions corresponding to the radial directions of the locking rings and the roller shafts.
4. The special manufacturing method of the split combined type collar assembly high-speed steel roller according to claim 1, wherein the centrifugal composite casting of the effective rolling part in the S1 specifically comprises the following steps:
s11, casting an outer layer molten metal of an effective rolling part, namely casting the outer layer molten metal by adopting a high-speed steel molten metal with chemical components of C1.6-2.3%, si0.4-0.8%, mn0.4-1.1%, cr4-8%, ni0.3-1.0%, mo3-5.5%, V3-5.5% and W0.5-4.0, smelting and deoxidizing and purifying to control harmful elements P less than or equal to 0.035%, S less than or equal to 0.03% and O less than or equal to 20PPM, discharging at 1580deg.C, standing for 10-15 minutes, removing surface scum, and injecting the outer layer molten metal into an assembled high-speed rotating centrifugal casting mold with a mold temperature of 80-120deg.C through a casting hopper and a launder at 1450-1480deg.C;
s12, pouring high silica ink steel core metal liquid with chemical components of C1.2-1.8%, si2.4-2.8%, mn0.5-0.8%, P less than or equal to 0.035 and S less than or equal to 0.03 into a cavity when the outer layer metal liquid is in a semi-solid state, namely before approaching to a solidifying point T2, and the temperature T1 in the cavity meets T1=T2+50 ℃;
s13, after the core metal liquid is solidified, stopping the centrifuge at a temperature T3 of less than or equal to 1000 ℃ in an inner hole of a cavity, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the position, slowly cooling to room temperature, and opening the box for annealing;
s14, processing the annealed high-speed steel into a required effective part shape, reserving heat treatment and machining allowance after heat treatment, and processing the contact surface of the inner hole and each ring piece to a required size according to the precision and the precision after heat treatment.
5. The special manufacturing method of the split combined type collar assembly high-speed steel roller according to claim 1, wherein the integral centrifugal casting of the auxiliary rolling part in the step S2 specifically comprises the following steps:
s21, pouring molten metal at an auxiliary rolling part, namely pouring semisteel molten metal with chemical components of C1.4-1.6%, si0.4-0.8%, mn0.4-1.1%, cr0.8-1.2%, ni0.6-1.0% and Mo0.2-0.5%, controlling harmful elements P to be less than or equal to 0.035%, S to or equal to 0.03%, O to or less than 20PPM and tapping at 1580 ℃, standing for 10-15 minutes, removing surface scum, pouring the outer layer molten metal into an assembled centrifugal casting mold with high-speed rotation at the mold temperature of 80-120 ℃ through a pouring funnel and a launder at 1450-1480 ℃;
s22, after the molten metal is completely solidified, stopping the centrifuge at a temperature T4 of an inner hole of a cavity of the die, placing a slow cooling pit, filling the inner cavity with a covering heat preservation agent, and when the temperature of a roll body casting mould is reduced to 500 ℃ or below, wrapping heat-insulating cotton at the part, slowly cooling to room temperature, and opening a blank;
s23, machining the parts of the required auxiliary parts into shapes, reserving heat treatment and machining allowance after heat treatment, machining the contact surfaces of the inner holes and the ring parts to the required sizes according to the precision and the size after heat treatment, and in addition, operating the connecting parts of the locking rings at the side, the inner holes and the shaft, machining the corresponding parts of the rough threads and the shaft into transition fit, wherein the flange fit adopted by the connecting parts of the other inner holes and the shaft, including the positioning rings at the transmission side and the shaft end surface, is interference fit, and the interference is 0.6-0.7 per mill.
6. The special manufacturing method of the split combined type collar assembled high-speed steel roller is characterized in that the roller shaft in the S3 comprises a transmission side and an operation side, a flange structure is arranged at the connection part of the transmission side and the positioning ring, a rough thread is arranged at the connection part of the operation side and the locking ring, and the thread spiral direction corresponds to the rotation direction of the operation side.
7. The special manufacturing method of the split combined type collar assembly high-speed steel roller according to claim 1, wherein the effective rolling part and the auxiliary rolling part in the step S4 are heated to 200-250 ℃ and then subjected to heat assembly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310965891.3A CN117047063A (en) | 2023-08-01 | 2023-08-01 | Special manufacturing method for split combined type collar assembly high-speed steel roller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310965891.3A CN117047063A (en) | 2023-08-01 | 2023-08-01 | Special manufacturing method for split combined type collar assembly high-speed steel roller |
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| CN202310965891.3A Pending CN117047063A (en) | 2023-08-01 | 2023-08-01 | Special manufacturing method for split combined type collar assembly high-speed steel roller |
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| CN (1) | CN117047063A (en) |
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