CN104858013A - Composite roll skin of four-roll crusher and preparation process for composite roll skin - Google Patents
Composite roll skin of four-roll crusher and preparation process for composite roll skin Download PDFInfo
- Publication number
- CN104858013A CN104858013A CN201510288433.6A CN201510288433A CN104858013A CN 104858013 A CN104858013 A CN 104858013A CN 201510288433 A CN201510288433 A CN 201510288433A CN 104858013 A CN104858013 A CN 104858013A
- Authority
- CN
- China
- Prior art keywords
- welding
- protective layer
- roller
- skin
- roll skin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
- B02C4/305—Wear resistant rollers
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/12—Laminated parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/554—Wear resistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
Abstract
The invention discloses composite roll skin of a four-roll crusher and a preparation process for the composite roll skin in the technical field of metallurgical equipment manufacturing. The composite roll skin comprises three layers which are a roll skin body, a transitional layer and a protective layer in sequence from inside to outside, wherein the transitional layer is formed by surfacing of welding wires with the hardness of HRC30-40; the protective layer is formed by surfacing of welding wires with the hardness of HRC50-55; finally the hardness of the roll skin is enhanced through integral annealing treatment. The composite roll skin has the benefits that the transitional layer and the protective layer are arranged outside original roll skin, the protective layer has very high hardness and is strong in wear resistance and impact resistance, and the transitional layer is capable of forming good hardness transition between the roll skin body and the protective layer, so that the whole roll skin has a certain toughness. The transitional layer and the protective layer are subjected to surfacing with a specific process, so that surfacing layers can be originally molten together, the roll skin is stable and reliable in overall structure and high in hardness and toughness, the service life of the roll skin is greatly prolonged, and the cost is reduced.
Description
Technical field
The present invention relates to metallurgical equipment manufacturing technology field, particularly relate to a kind of composite roll skin and manufacture craft thereof of four-roller crusher.
Background technology
Four-roller crusher is the capital equipment of coal and coke fragmentation in steel mill's sintering system, the grinding pressure utilizing upper and lower two groups of breaker rolls relatively to rotate generation carrys out broken material, general top roll gap 10mm, lower roll gap 3mm, reaches raw meal particle size requirement by the gap adjusting upper and lower roller.
During broken burnt roller work, its pressure is at 10 ~ 15MP, belongs to high stress material abrasion state, not only will have fine wearability, impact resistance for broken burnt roller, also will have higher intensity and anti-extrusion performance simultaneously.
Broken burnt roller is made up of axle, rim, thrust ring, pull bar and roller skin etc., its central roll skin is consumable accessory in broken burnt roller composition, directly contact with material, at work by abrasive wear and extruding, normal service life is 3 ~ 8 months, and the broken burnt roller roller skin used at present mainly contains two kinds, one adopts ZG35CrMnSi monoblock cast, by directly using after modifier treatment, case hardness is low, and service life is generally at 3 ~ 5 months; Another kind adopts ZG270-500 monoblock cast, then weld groove is piled in the roller skin system of getting on the bus, built-up welding high chromium alloy material, although this roller wearability is fine, case hardness can reach HRC58 ~ 62, but due to high chromium alloy material toughness extreme difference, so easily occur in use procedure that large area is chapped, even fall block, service life is generally at 6 ~ 8 months.Therefore in order to improve the service life of roller, reducing plant maintenance and time between overhauls(TBO), reducing production cost, seeking a kind of new four-roller crusher roller skin particularly important.
Summary of the invention
For overcoming low the wearing no resistance of existing broken burnt roller roller skin hardness, the toughness that hardness is high is poor again waits deficiency, and technical problem to be solved by this invention is: provide a kind of wearability good, has again the composite roll skin of certain toughness and makes the technique of this composite roll skin simultaneously.
The technical solution adopted for the present invention to solve the technical problems is:
Four-roller crusher composite roll skin; comprise roller skin body; heap weld groove is provided with on the surface of described roller skin body; roller skin body exterior is provided with transition zone; the outside of transition zone is provided with protective layer; described transition zone is that the welding wire built-up welding of hardness between HRC30 ~ 40 forms, and protective layer is that the welding wire built-up welding of hardness between HRC50 ~ 55 forms.
Make the technique of this four-roller crusher composite roll skin, comprise the following steps:
I, ZG35CrMnSi material use lost foam casting roller skin body is adopted;
II, utilize machine tooling to go out the cylindrical of roller skin body, and go out to pile weld groove in the Surface Machining of roller skin body;
III, roller skin body is fixed on overlaying welding machine tool, heats after four hours at the temperature of 260 ± 20 DEG C, adopt the welding wire of hardness between HRC30 ~ 40 to carry out built-up welding at roller skin body surface, form transition zone, be incubated in weld deposit process;
IV, after step III terminates, continue heating and keep overlay cladding temperature >=260 DEG C, then adopt the welding wire of hardness between HRC50 ~ 55 again to carry out built-up welding on the surface of transition zone, form protective layer, be incubated in weld deposit process;
V, whole composite roll skin is heated to 350 DEG C ± 20 DEG C after terminating by step IV, and samming keeps 4 ~ 5 hours, then wraps to be transferred in annealing furnace with insulation material and carries out annealing in process;
VI, after having annealed, lathe is processed the cylindrical of composite roll skin, roll surface roughness reaches instructions for use.
More particularly, the heap weld groove described in step II is processed into helical structure at roller skin body surface.
More particularly, the transition zone in step III carries out built-up welding along the heap weld groove of helical structure, and transition zone at least built-up welding is two-layer, and transition zone general thickness is not less than 3mm.
More particularly, the protective layer described in step IV adopts the mode of spiral movement to carry out built-up welding, and protective layer is built-up welding 16 layers at least, and adjacent two layers weld seam staggers mutually, and protective layer gross thickness is not less than 25mm.
The invention has the beneficial effects as follows: by arranging transition zone and protective layer outside original roller skin; protective layer has very high hardness; wear-resisting, impact resistance is strong, and transition zone then can form good hardness transition between roller skin body and protective layer, makes whole roller leatherware have certain toughness.Transition zone and protective layer adopt specific technique to carry out built-up welding, and each overlay cladding can organically be fused together, and overall structure is reliable and stable, has high rigidity and high tenacity concurrently, significantly improves the service life of roller skin.
Accompanying drawing explanation
Fig. 1 is the structural representation of composite roll skin of the present invention.
Fig. 2 is the structural representation that the present invention piles weld groove.
Fig. 3 is the structural representation of each interlayer of protective layer of the present invention.
Be labeled as in figure, 1-roller skin body, 2-transition zone, 3-protective layer, 11-piles weld groove, 31-weld seam.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1 and Figure 2; composite roll skin involved in the present invention; comprise roller skin body 1; heap weld groove 11 is provided with on the surface of described roller skin body 1; roller skin body 1 outside is provided with transition zone 2; the outside of transition zone 2 is provided with protective layer 3, and described transition zone 2 is that the welding wire built-up welding of hardness between HRC30 ~ 40 forms, and protective layer 3 is that the welding wire built-up welding of hardness between HRC50 ~ 55 forms.Heap weld groove 11 is set, can ensures that transition zone 2 can fully contact with roller skin body 1, improve the stability of welding.Protective layer 3 is positioned at outermost layer, in order to meet job requirement, needs very high intensity and wearability, adopts the welding wire of hardness between HRC50 ~ 55 just can meet the demands.In order to reduce impact; protective layer is avoided to chap; transition zone 2 is provided with between roller skin body 1 and protective layer 3; the transition zone of the welding wire built-up welding of hardness between HRC30 ~ 40 has certain toughness; can good hardness transition be formed, all there is certain protective role to protective layer 3 and roller skin body 1.
Make the technique of this composite roll skin, comprise the following steps:
I, ZG35CrMnSi material use lost foam casting roller skin body is adopted;
II, utilize machine tooling to go out the cylindrical of roller skin body, and go out to pile weld groove in the Surface Machining of roller skin body;
III, roller skin body is fixed on overlaying welding machine tool, heats after four hours at the temperature of 260 ± 20 DEG C, adopt the welding wire of hardness between HRC30 ~ 40 to carry out built-up welding at roller skin body surface, form transition zone, be incubated in weld deposit process;
IV, after step III terminates, continue heating and keep overlay cladding temperature >=260 DEG C, then adopt the welding wire of hardness between HRC50 ~ 55 again to carry out built-up welding on the surface of transition zone, form protective layer, be incubated in weld deposit process;
V, whole composite roll skin is heated to 350 DEG C ± 20 DEG C after terminating by step IV, and samming keeps 4 ~ 5 hours, then wraps to be transferred in annealing furnace with insulation material and carries out annealing in process;
VI, after having annealed, lathe is processed the cylindrical of composite roll skin, roll surface roughness reaches instructions for use.
Because ZG35CrMnSi is usually used in withstanding shocks, frayed part, combination property is better, and be applicable to roller skin body 1, even if when protective layer 3 all exhausts, roller skin body 1 still can use about 3 months.The casting flaws such as slag inclusion, burning into sand, pore can not be had to occur at casting process.
Should leave enough spaces for follow-up built-up welding when pair roller skin body 1 carries out Excircle machining, the heap weld groove on surface should be tried one's best more intensive as far as possible, increases the transition zone 2 of built-up welding and the contact area of roller skin body 1, thus improves the stability of welding.Preferably heap weld groove 11 is set to the helical structure around roll body surface, as shown in Figure 2, is convenient to processing on the one hand, also provides convenience for follow-up built-up welding on the other hand, can carry out along heap weld groove 11 when built-up welding transition zone 2, make built-up welding efficiency higher.
When carrying out transition zone 2 and protective layer 3 built-up welding; need to carry out under the constant temperature of about 260 DEG C; practical experience proves that built-up welding at this temperature can arrive a best welding effect, roller skin body 1 and welding wire molten metal can fuse more fully, stability is better.
In order to play certain buffering transitional function, described transition zone 2 at least answers built-up welding two-layer, and integral thickness is not less than 3mm.Protective layer 3 is because needing very high resistance to impact; at least answer built-up welding 16 layers; adjacent two layers weld seam staggers mutually; as shown in Figure 3; protective layer gross thickness is not less than 25mm, and protective layer 3 equally also adopts spiral form to weld, the layout that adjacent two layers weld seam staggers; avoid stress to concentrate and the problem such as unbalance stress, be conducive to improving stability.Finally again annealing in process is carried out to it, further increase the intensity of protective layer.
The protective layer 3 in this composite roll skin main outer portion when in use carries out rolling work, after protective layer 3 grinds groove, breaker roll directly can be removed the groove that roller skin grinds on lathe, can repeatedly use, even if after protective layer 3 and excessive layer 2 are all worn, the roller skin body 1 of innermost layer can also continue use about 3 months, so the service life of whole composite roll skin can reach about 2 years, compare and increase significantly with the service life of conventional roll skin 3 ~ 8 each moon, not only greatly provide cost savings, also improve operating efficiency, there is good application prospect.
Claims (5)
1. four-roller crusher composite roll skin; comprise roller skin body (1); it is characterized in that: be provided with heap weld groove (11) on the surface of described roller skin body (1); roller skin body (1) outside is provided with transition zone (2); the outside of transition zone (2) is provided with protective layer (3); described transition zone (2) forms for the welding wire built-up welding of hardness between HRC30 ~ 40, and protective layer (3) forms for the welding wire built-up welding of hardness between HRC50 ~ 55.
2. make the technique of four-roller crusher composite roll skin as claimed in claim 1, it is characterized in that: comprise the following steps:
I, ZG35CrMnSi material use lost foam casting roller skin body is adopted;
II, utilize machine tooling to go out the cylindrical of roller skin body, and go out to pile weld groove in the Surface Machining of roller skin body;
III, roller skin body is fixed on overlaying welding machine tool, heats after four hours at the temperature of 260 ± 20 DEG C, adopt the welding wire of hardness between HRC30 ~ 40 to carry out built-up welding at roller skin body surface, form transition zone, be incubated in weld deposit process;
IV, after step III terminates, continue heating and keep overlay cladding temperature >=260 DEG C, then adopt the welding wire of hardness between HRC50 ~ 55 again to carry out built-up welding on the surface of transition zone, form protective layer, be incubated in weld deposit process;
V, whole composite roll skin is heated to 350 DEG C ± 20 DEG C after terminating by step IV, and samming keeps 4 ~ 5 hours, then wraps to be transferred in annealing furnace with insulation material and carries out annealing in process;
VI, after having annealed, lathe is processed the cylindrical of composite roll skin, roll surface roughness reaches instructions for use.
3. the manufacture craft of four-roller crusher composite roll skin as claimed in claim 2, is characterized in that: the heap weld groove described in step II is processed into helical structure at roller skin body surface.
4. the manufacture craft of four-roller crusher composite roll skin as claimed in claim 3, is characterized in that: the transition zone in step III carries out built-up welding along the heap weld groove of helical structure, and transition zone at least built-up welding is two-layer, and transition zone general thickness is not less than 3mm.
5. the manufacture craft of four-roller crusher composite roll skin as described in claim 2,3 or 4; it is characterized in that: the protective layer described in step IV adopts the mode of spiral movement to carry out built-up welding; protective layer is built-up welding 16 layers at least, and adjacent two layers weld seam staggers mutually, and protective layer gross thickness is not less than 25mm.
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| CN201510288433.6A CN104858013B (en) | 2015-05-29 | 2015-05-29 | Four-roller crusher composite roll skin and its manufacture craft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510288433.6A CN104858013B (en) | 2015-05-29 | 2015-05-29 | Four-roller crusher composite roll skin and its manufacture craft |
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| CN104858013A true CN104858013A (en) | 2015-08-26 |
| CN104858013B CN104858013B (en) | 2017-10-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105127686A (en) * | 2015-09-23 | 2015-12-09 | 邢立杰 | Tension leveler roller preparation process |
| CN106076480A (en) * | 2016-07-07 | 2016-11-09 | 江苏双发机械有限公司 | A kind of roll squeezer alloy roller shell and processing method thereof |
| CN108202209A (en) * | 2016-12-19 | 2018-06-26 | 查道球 | A kind of preparation method of high abrasion shock resistance roller surface lining plate and compression roller |
| CN108994482A (en) * | 2018-08-13 | 2018-12-14 | 芜湖鼎瀚再制造技术有限公司 | A kind of crusher's rollers bead-welding technology |
| CN114411156A (en) * | 2022-01-21 | 2022-04-29 | 中国矿业大学 | Preparation method of wear-resistant casting for complex conditions and wear-resistant casting |
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| Publication number | Publication date |
|---|---|
| CN104858013B (en) | 2017-10-03 |
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