CN105312854A - Method for manufacturing housing wear-resisting plate of metallurgical hot mill - Google Patents
Method for manufacturing housing wear-resisting plate of metallurgical hot mill Download PDFInfo
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- CN105312854A CN105312854A CN201510697722.1A CN201510697722A CN105312854A CN 105312854 A CN105312854 A CN 105312854A CN 201510697722 A CN201510697722 A CN 201510697722A CN 105312854 A CN105312854 A CN 105312854A
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- carburizing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a method for manufacturing a housing wear-resisting plate of a metallurgical hot mill. The method includes the steps of 1, rough machining, 2, carburizing treatment, 3, primary semi-finish machining, 4, quenching and tempering treatment, 5, secondary semi-finish machining, 6, ageing treatment and 7, finish machining; through finish machining, a finished product meets the requirement for the size. According to the method, the wear-resisting plate is manufactured with 20CrMo as an original base material, as low-carbon alloy steel, the 20CrMo has a hard and wear-resisting working surface and a tough core portion after being subjected to carburizing and quenching, and the 20CrMo has high low-temperature impact toughness which right meets the characteristic of a currently used CORC-G wear-resisting plate, so that the purpose of replacing the CORC-G wear-resisting plate is achieved.
Description
Technical field
The invention belongs to technical field of metallurgical machinery, relate to a kind of preparation method for metallurgical hot-rolling mill memorial archway wearing plate.
Background technology
In the Tang Gang five tandem rolling product that Siemens's VAI makes, be configured with a collection of wearing plate, material requirements working face hardness 60HRC, Siemens is cruel this plate (corc-g) to the designing material of this wearing plate.
Existing cruel this plate (corc-g) selects high material that is hard, high abrasion to make working face, the good material of impact resistance, pliability is selected to make base material, by the method for explosive welding, combining of the material stubbornness making two kinds of performances different, obtains new high abrasion lining material.The main performance of corc-g wearing plate is, working face hardness HRC60 ± 2, the dark 3 ~ 4mm of working face hard formation, and matrix material is ordinary carbon steel, hardness≤240HB.Because made liner plate had after heat treatment both had higher hardness and wear resistance, there is again better pliability and impact resistance, be mainly used in metallurgical hot-rolling mill (particularly cut deal continuous hot-rolling mill) memorial archway wearing plate, working roll, backing roll wearing plate.
But this material price of existing market buying is high, and most of finished-product material all exists surperficial magnetic powder inspection has Multiple site crack, the problem that case hardness is uneven, thus causes completed knocked down products defective.Owing to having great rolling impulsive force when steel billet enters roll, there is in work great roll-force, these great impulsive forces and roll-force require that memorial archway liner plate and working roll, backing roll liner plate have higher hardness and abrasion resistance, realize good flexility shock-resistant simultaneously.Therefore, develop a kind of wearing plate substitute, become the problem being badly in need of solving.
Summary of the invention
The object of this invention is to provide a kind of preparation method for metallurgical hot-rolling mill memorial archway wearing plate, solve wearing plate in prior art and adopt cruel this plate (corc-g), product price is high, and magnetic powder inspection has crackle, and case hardness does not reach the problem of drawing requirement.
The technical solution adopted in the present invention is, a kind of preparation method for metallurgical hot-rolling mill memorial archway wearing plate, implements according to following steps:
Step 1, roughing
Suppose that the finished product thickness of wearing plate workpiece is t, employing thickness is the 20CrMo steel plate cutting of t+10mm, meets size A and size B, checks the depth of parallelism intercepting the wearing plate obtained, this depth of parallelism≤2mm, otherwise smooth after blanking;
First with wearing plate thickness two sides acted as reference mutual, carry out preliminary grinding to wearing plate thickness two sides, after control grinding, the thickness of wearing plate is to t+8mm+0.2mm;
On milling machine, process the profile of wearing plate again, the inclined-plane on processing dimension A, size B and both sides, carburizing and quenching face, the monolateral allowance of size A and size B is 7mm+0.1mm, and the monolateral allowance on inclined-plane is 5mm, and roughness all reaches Ra3.2, obtains wearing plate workpiece;
Then, on wearing plate workpiece, joint hole is arranged in processing more; Room between each row's joint hole processes two holes for hoist altogether;
Step 2, Carburization Treatment
Abutted against each other in the non-carburizing and quenching face of two pieces wearing plate workpiece, make the carburizing and quenching face of two pieces wearing plate workpiece and inclined-plane thereof outwardly, it is firm closing to be utilized closing bolt by the joint hole of correspondence, carries out Carburization Treatment getting togather four after closing bolt;
Step 3, semifinishing
Dismantle four conjunction bolt, separately two pieces wearing plate workpiece, each wearing plate workpiece is with carburizing and quenching face for benchmark draws processing line, and the single side size allowance in carburizing and quenching face is 1mm+0.1mm;
Milling machine is processed all the other each except carburizing and quenching face, and wherein the size allowance in non-carburizing and quenching face is 2.5mm+0.2mm, and all the other each spot size allowances are 1mm+0.1mm, and roughness is Ra3.2;
Then, grinding machine is processed non-carburizing and quenching face, the size allowance in non-carburizing and quenching face is 2mm+0.1mm, and roughness reaches Ra1.6, and carburizing and quenching face wouldn't process, monolateral allowance 1mm+0.1mm;
Finally, the hole for hoist of fine finishining two groups lifting dismounting on drilling machine;
Step 4, quenching and tempering process;
Step 5, again semifinishing
First with location, carburizing and quenching face, wearing plate thickness of workpiece two sides acted as reference mutual, grinding carburizing and quenching face and non-carburizing and quenching face, the size allowance in carburizing and quenching face and non-carburizing and quenching face is 0.4+0.2mm; Then with each hole for benchmark draws each processing line;
On milling machine to the layout line with machined surface centering, by size A, size B and each inclined-plane 3 milling to finished size requirement;
Step 6, Ageing Treatment;
Step 7, fine finishining
With carburizing and quenching face and non-carburizing and quenching face acted as reference mutual, repeatedly to turn over, grinding machine is processed carburizing and quenching face and non-carburizing and quenching face to finished size requirement.
The invention has the beneficial effects as follows, manufacturing process is simple, and cost is low, can substitute cruel this plate (corc-g) completely, meets design requirement and the instructions for use of product.
Accompanying drawing explanation
Fig. 1 is the front view of the inventive method wearing plate workpiece to be prepared;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the structural representation that two wearing plate workpiece put together on together;
Fig. 4 is the inventive method Carburization Treatment process curve figure;
Fig. 5 is the inventive method Quenching Treatment temperature-time figure;
Fig. 6 is the inventive method aging temperature time diagram.
In figure, 1. joint hole, 2. hole for hoist, 3. inclined-plane, 4. carburizing and quenching face, 5. wearing plate workpiece, 6. closing bolt, 7. non-carburizing and quenching face.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The inventive method adopts 20CrMo to make wearing plate as primary substrate, 20CrMo is as low-carbon alloy steel, there is hard and wear-resisting working surface and tough and tensile core after carburizing and quenching process, there is higher low-temperature impact toughness, this characteristic meets the characteristic of the CORC-G wearing plate of existing use just, can realize the object replacing CORC-G wearing plate.
With reference to Fig. 1, Fig. 2, the structure of the inventive method wearing plate workpiece 5 to be prepared is, a face of wearing plate workpiece 5 thickness direction is burnishing surface (i.e. non-carburizing and quenching face 7), another face of thickness direction is variable cross-section, comprise and be positioned at the larger carburizing and quenching face 4 of middle part area, and being positioned at long and narrow inclined-plane 3, both sides, carburizing and quenching face 4, the heat treatment requirements hardness in this carburizing and quenching face 4 is HRC58+2, and the quenching hardness degree of depth is 1.5mm-2mm.
The present invention is used for the preparation method of metallurgical hot-rolling mill memorial archway wearing plate, implements according to following steps:
Step 1, roughing
Suppose that the finished product thickness of wearing plate workpiece 5 is
(this is dimensional discrepancy symbol, and represent that the upper deviation of thickness t size is 0, lower deviation is-0.1, also can directly symbolization tmm represent); Employing thickness is the 20CrMo steel plate cutting of t+10mm, ensures to meet size A and size B, checks the depth of parallelism intercepting the wearing plate obtained, ensure this depth of parallelism≤2mm, otherwise smooth after blanking;
First with wearing plate thickness two sides acted as reference mutual, carry out preliminary grinding to wearing plate thickness two sides, after control grinding, the thickness of wearing plate is to t+8mm+0.2mm;
The profile of wearing plate is processed again on milling machine, the inclined-plane 3 (see Fig. 2) on processing dimension A, size B and both sides, carburizing and quenching face 4, the monolateral allowance of size A and size B is 7mm+0.1mm, and the monolateral allowance on inclined-plane 3 is 5mm, roughness all reaches Ra3.2, obtains wearing plate workpiece 5;
Then, processing many rows joint hole 1 (penetrating through hole) on wearing plate workpiece 5, for Carburization Treatment; Room between each row's joint hole 1 processes two holes for hoist 2 altogether, hole for hoist 2 installs lifting earrings screwed hole used, the orifice chamfer of each hole for hoist 2 is 2 × 45 ° (namely chamfering angle size is designated C2), prevents carburizing crackle, sees Fig. 2;
Be positioned at the joint hole 1 allowance processing through hole respectively of corner, these four through holes are for installing closing bolt 6, and such as the requirement of joint hole 1 actual size is
can be processed as in advance
through hole be used for installing closing a bolt 6, wait subsequent technique to dismantle closing after bolt 6, then reaming is arrived
Symmetrical two pieces wearing plate workpiece 5 is processed according to above-mentioned method.
Step 2, Carburization Treatment
With reference to Fig. 3, the non-carburizing and quenching face 7 (i.e. burnishing surface) of two pieces wearing plate workpiece 5 is abutted against each other, make the carburizing and quenching face 4 of two pieces wearing plate workpiece 5 and inclined-plane 3 thereof outwardly, it is firm closing to be utilized closing bolt 6 by the joint hole 1 of penetrating correspondence, to reduce the workpiece deformation in Carburization Treatment process, Carburization Treatment can be carried out after conjunction bolt 6 getting togather four
With reference to Fig. 4, Carburization Treatment process is: first heat up, and programming rate is not more than 60 DEG C/h, leads to methyl alcohol when being warmed up to 650 DEG C, leads to isopropyl alcohol when being warmed up to 750 DEG C; Be incubated when being warmed up to 920 DEG C-930 DEG C, first put into carburizing sample samming 2-2.5 hour (after furnace temperature rises to 920 DEG C-930 DEG C by being meant to of samming, part actual temperature does not also reach, certain hour insulation need be carried out, the each spot temperature of part is made to reach consistent, sample is put into when this process starts), then 50-55 hour is oozed by force under carbon potential 1.07 condition, then under carbon potential 0.85 condition, spread 20-25 hour; At carbon potential 0.85 condition borehole cooling to 850 DEG C ± 10 DEG C blowing outs, temperature fall time is 5-6 hour; Finally naturally cool to and come out of the stove lower than 450 DEG C;
In Carburization Treatment, use
pit gas carburizing furnace, carburizer adopts methyl alcohol and isopropyl alcohol, and carburizing controls to adopt microcomputer carbon potential control system, and carburized (case) depth is 4mm; Masking paste is brushed at non-carburizing position.
Step 3, semifinishing
Dismantle four conjunction bolt 6, separately two pieces wearing plate workpiece 5, each wearing plate workpiece 5 for benchmark draws processing line, ensures that the single side size allowance in carburizing and quenching face 4 is 1mm+0.1mm with carburizing and quenching face 4;
Milling machine is processed all the other each except carburizing and quenching face 4, and wherein the size allowance in non-carburizing and quenching face 7 is 2.5mm+0.2mm, and all the other each spot size allowances are 1mm+0.1mm, and roughness is Ra3.2;
Then, locate with carburizing and quenching face 4, grinding machine is processed non-carburizing and quenching face 7, the size allowance in non-carburizing and quenching face 7 is 2mm+0.1mm, and roughness reaches Ra1.6, and carburizing and quenching face 4 wouldn't process, and ensures monolateral allowance 1mm+0.1mm; (two workpiece put together on together just in order to symmetrical Carburization Treatment, just take apart after Carburization Treatment, grinding herein be non-carburizing and quenching face 7)
Finally, the hole for hoist 2 of fine finishining two groups lifting dismounting on drilling machine, see Fig. 1, the orifice chamfer of each hole for hoist 2 is 2 × 45 ° (or chamfering angle size is designated C2), and the gabarit allowance of size A and size B is 1mm+0.1mm.
Step 4, quenching and tempering process
Adopt
well-type electric furnace, protective atmosphere is methyl alcohol, and after quenching, Leeb Hardness Tester detects hardness, and detecting carburizing and quenching surface hardness is HRC58-59;
Quenching processing technology is: entering stove lower than when 350 DEG C, then starts to heat up, and programming rate is not more than 60 DEG C/h, insulation 4-5 hour when being warmed up to 820 DEG C-830 DEG C, oil cooling to 150 DEG C-200 DEG C;
Temper technique is: heat up with stove, is incubated 5-6 hour, air cooling of coming out of the stove, with reference to Fig. 5 when being warmed up to 180 DEG C ± 10 DEG C.
Step 5, again semifinishing
First locate with carburizing and quenching face 4 in Fig. 2, wearing plate workpiece 5 thickness two sides acted as reference mutual, grinding carburizing and quenching face 4 and non-carburizing and quenching face 7, the size allowance in carburizing and quenching face 4 and non-carburizing and quenching face 7 is 0.4+0.2mm; Then with each hole for benchmark draws each processing line, be namely the processing line that benchmark draws size A, size B profile according to the hole processed;
On milling machine to the layout line with machined surface centering, by size A, size B and each inclined-plane 3 milling to finished size requirement, inclined-plane 3 is machined to drawing dimensional requirement according to thickness allowance, and (the size allowance in carburizing and quenching face 4 is 0.4mm+0.2mm, so deepen 0.4mm+0.2mm when processing inclined-plane 3, when such fine finishining carburizing and quenching face 4 to finished size requires, inclined-plane 3 is also to finished size requirement);
Brill, each joint hole 1 to finished size requirement of milling, adopt carbide-tipped milling cutter and carbide drill during processing joint hole 1.
Step 6, Ageing Treatment,
Steel (or alloy) is after solution treated (can be regarded as quenching), molten prime element in molten matter in its solid solution will be in hypersaturated state, if molten matter atom still has certain diffusivity under room temperature or certain certain high temperature, continuity so in time, molten prime element in supersaturation solid solution is by de-for generation molten (or precipitation), thus the performance of steel (or alloy) (mechanics, physics, chemical property) is changed, the object of this step timeliness mainly in order to remove the stress after processing, stabilizer elements size and institutional framework.
Adopt
well formula tempering furnace, aging treatment process is: first heat up with stove, and be warming up to 180 DEG C ± 10 DEG C insulation 10-12 hour, air cooling of coming out of the stove, is shown in Fig. 6.
Step 7, fine finishining
First locate with carburizing and quenching face 4, carburizing and quenching face 4 and non-carburizing and quenching face 7 acted as reference mutual, repeatedly turn over individual, grinding machine is processed carburizing and quenching face 4 and 7 to the finished size requirement of non-carburizing and quenching face.
Each wearing plate workpiece 5 is a finished product, and each wearing plate workpiece 5 is carried out to magnetic particle testing and detects the hardness in wearing plate carburizing and quenching face.
Actual production is verified, wearing plate workpiece 5 has prepared 20 altogether, is HRC58+1 through surveying the hardness in carburizing and quenching face 4, and hardness is even, meets drawing technical requirement; Magnetic particle testing carburizing and quenching face 4, surface flawless, the qualification rate of product reaches 100%, and testing result obtains the accreditation of user.
Claims (4)
1., for a preparation method for metallurgical hot-rolling mill memorial archway wearing plate, it is characterized in that, implement according to following steps:
Step 1, roughing
Suppose that the finished product thickness of wearing plate workpiece (5) is t, employing thickness is the 20CrMo steel plate cutting of t+10mm, meets size A and size B, checks the depth of parallelism intercepting the wearing plate obtained, this depth of parallelism≤2mm, otherwise smooth after blanking;
First with wearing plate thickness two sides acted as reference mutual, carry out preliminary grinding to wearing plate thickness two sides, after control grinding, the thickness of wearing plate is to t+8mm+0.2mm;
The profile of wearing plate is processed again on milling machine, the inclined-plane (3) on processing dimension A, size B and carburizing and quenching face (4) both sides, the monolateral allowance of size A and size B is 7mm+0.1mm, the monolateral allowance on inclined-plane (3) is 5mm, roughness all reaches Ra3.2, obtains wearing plate workpiece (5);
Then, arrange joint hole (1) in the upper processing of wearing plate workpiece (5) more; Room between each row's joint hole (1) processes two holes for hoist (2) altogether;
Step 2, Carburization Treatment
The non-carburizing and quenching face (7) of two pieces wearing plate workpiece (5) is abutted against each other, make the carburizing and quenching face (4) of two pieces wearing plate workpiece (5) and inclined-plane (3) thereof outwardly, being utilized closing bolt (6) firm for conjunction by the joint hole (1) of correspondence, carrying out Carburization Treatment getting togather four after conjunction bolt (6);
Step 3, semifinishing
Dismantle four conjunction bolt (6), separately two pieces wearing plate workpiece (5), each wearing plate workpiece (5) is with carburizing and quenching face (4) for benchmark draws processing line, and the single side size allowance of carburizing and quenching face (4) is 1mm+0.1mm;
Milling machine processes all the other each except carburizing and quenching face (4), and wherein the size allowance of non-carburizing and quenching face (7) is 2.5mm+0.2mm, and all the other each spot size allowances are 1mm+0.1mm, and roughness is Ra3.2;
Then, grinding machine is processed non-carburizing and quenching face (7), the size allowance of non-carburizing and quenching face (7) is 2mm+0.1mm, and roughness reaches Ra1.6, and carburizing and quenching face (4) wouldn't process, monolateral allowance 1mm+0.1mm;
Finally, the hole for hoist (2) of fine finishining two groups lifting dismounting on drilling machine;
Step 4, quenching and tempering process;
Step 5, again semifinishing
First locate with carburizing and quenching face (4), wearing plate workpiece (5) thickness two sides acted as reference mutual, grinding carburizing and quenching face (4) and non-carburizing and quenching face (7), the size allowance in carburizing and quenching face (4) and non-carburizing and quenching face (7) is 0.4+0.2mm; Then with each hole for benchmark draws each processing line;
On milling machine to the layout line with machined surface centering, by size A, size B and each inclined-plane (3) milling to finished size requirement;
Step 6, Ageing Treatment;
Step 7, fine finishining
With carburizing and quenching face (4) and non-carburizing and quenching face (7) acted as reference mutual, repeatedly to turn over, grinding machine is processed carburizing and quenching face (4) and non-carburizing and quenching face (7) to finished size requirement.
2. the preparation method for metallurgical hot-rolling mill memorial archway wearing plate according to claim 1, it is characterized in that, in described step 2, Carburization Treatment detailed process is:
First heat up, programming rate is not more than 60 DEG C/h, leads to methyl alcohol when being warmed up to 650 DEG C, leads to isopropyl alcohol when being warmed up to 750 DEG C; Be incubated when being warmed up to 920 DEG C-930 DEG C, first put into carburizing sample samming 2-2.5 hour, then ooze 50-55 hour by force under carbon potential 1.07 condition, then under carbon potential 0.85 condition, spread 20-25 hour; At carbon potential 0.85 condition borehole cooling to 850 DEG C ± 10 DEG C blowing outs, temperature fall time is 5-6 hour; Finally naturally cool to and come out of the stove lower than 450 DEG C;
In Carburization Treatment, use
pit gas carburizing furnace, carburizer adopts methyl alcohol and isopropyl alcohol, and carburizing controls to adopt microcomputer carbon potential control system, and carburized (case) depth is 4mm; Masking paste is brushed at non-carburizing position.
3. the preparation method for metallurgical hot-rolling mill memorial archway wearing plate according to claim 1, is characterized in that, in described step 4, quenching and tempering process detailed process is,
Adopt
well-type electric furnace, protective atmosphere is methyl alcohol, and after quenching, Leeb Hardness Tester detects hardness, and detecting carburizing and quenching surface hardness is HRC58-59;
Quenching processing technology is: entering stove lower than when 350 DEG C, then starts to heat up, and programming rate is not more than 60 DEG C/h, insulation 4-5 hour when being warmed up to 820 DEG C-830 DEG C, oil cooling to 150 DEG C-200 DEG C;
Temper technique is: heat up with stove, is incubated 5-6 hour, air cooling of coming out of the stove when being warmed up to 180 DEG C ± 10 DEG C.
4. the preparation method for metallurgical hot-rolling mill memorial archway wearing plate according to claim 1, is characterized in that, in described step 6, adopts
well formula tempering furnace, aging treatment process is: first heat up with stove, is warming up to 180 DEG C ± 10 DEG C insulation 10-12 hour, air cooling of coming out of the stove.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108546869A (en) * | 2018-05-14 | 2018-09-18 | 合肥东方节能科技股份有限公司 | A kind of energetic ion slitting wheel alloy material |
| CN108624798A (en) * | 2018-05-14 | 2018-10-09 | 合肥东方节能科技股份有限公司 | A kind of rolling mill guiding liner plate of high-wearing feature |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108504987A (en) * | 2018-05-14 | 2018-09-07 | 合肥东方节能科技股份有限公司 | A kind of Carburization Treatment technique of wear-resisting rolling mill guiding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108546869A (en) * | 2018-05-14 | 2018-09-18 | 合肥东方节能科技股份有限公司 | A kind of energetic ion slitting wheel alloy material |
| CN108624798A (en) * | 2018-05-14 | 2018-10-09 | 合肥东方节能科技股份有限公司 | A kind of rolling mill guiding liner plate of high-wearing feature |
| CN108624798B (en) * | 2018-05-14 | 2020-10-09 | 合肥东方节能科技股份有限公司 | High-wear-resistance rolling mill guide lining plate |
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| CN105312854B (en) | 2017-10-31 |
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