CN103350313A - Repair technology of cold mold for centrifugal casting of roller - Google Patents
Repair technology of cold mold for centrifugal casting of roller Download PDFInfo
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- CN103350313A CN103350313A CN2013102129417A CN201310212941A CN103350313A CN 103350313 A CN103350313 A CN 103350313A CN 2013102129417 A CN2013102129417 A CN 2013102129417A CN 201310212941 A CN201310212941 A CN 201310212941A CN 103350313 A CN103350313 A CN 103350313A
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Abstract
The invention discloses a repair technology of a cold mold for centrifugal casting of a roller. The repair technology comprises the following steps: A. broaching a scrapped cold mold: broaching the scrapped cold mold, so as to completely remove materials with defects on the inner wall of the cold mold; B, producing a corresponding inner bushing: producing the inner bushing of which the outer diameter is in interference fit with the inner diameter of the cold mold, and the inner diameter corresponds to the blank size of the outer diameter of the roller; C, assembling: heating the cold mold according to a shrinkage fitting technology, and pressing and mounting the inner bushing into the inner hole of the cold mold when the temperature of the cold mold rises to 400 to 450 DEG C; D, fixing: fixing the circumference surfaces at two ends of the seams of the outer diameter of the inner bushing and the inner diameter of the outer bushing through a plurality of perforation bolts after the assembly is fulfilled and the cold mold and the inner bushing are cooled to be in ordinary temperature. According to the invention, the scrapped cold mold is repaired and improved, so as to prolong the service life of the cold mold, improve the utilization ratio of the cold mold, and greatly reduce the manufacturing cost due to reutilization of the cold mold.
Description
Technical field
The present invention relates to the recycling technology of frock that a kind of centrifugal casting is used, specifically the centrifugal casting roll renovation technique of cold mould.
Background technology
Roll is a kind of foundry goods that not only need bear larger load but also need surface abrasion resistance.The main technique of producing at present roll is centrifugal casting.That outer layer metal elder generation centrifugal casting with the high rigidity of roll is in a cold mould when producing the centrifugal casting roll blank, before cold mould, rear two ends arrange respectively an end cap case, so that cold mould and before, form the cast die cavity between latter two end cap case, first cast is placed on the centrifugal casting machine during cast, molten iron is injected the die cavity of High Rotation Speed, utilize centrifugal action to make molten iron form the outer blank of roll high rigidity at the die cavity inwall, then take off cold mould, cold mould and the end emitted case is vertical to be connected, pour into a mould core of the roll in the cavity of the outer blank in cold mould, obtain the solid roller cast blank.
Produce in the process of roll in centrifugal casting, cold mould is the main perishable tool that roll is produced, centrifugal casting roll is produced used cold mould material and is generally casting pig, cold mould directly contacts with molten iron owing to cold type inner wall in the course of the work, cold type inner wall is subject to serious chilling and shock heating repeatedly, and general cold mould wall is thicker, therefore the tendency that the cold type inner wall generation is loosened is larger, so be easy to chap at the inwall of cold mould.
Can make roll uneven in temperature in process of setting after cold type inner wall cracks, thereby roller surface is cracked, cause roll to scrap.Cold mould needs High Rotation Speed when work simultaneously, if wall thickness tolerance differs greatly, the amount of unbalance that causes can cause cold mould to produce vibration, if untimely replacing not only affects product quality, also easily causes security incident.So the cold mould normal operation will be scrapped for about 20 times, the main cause of scrapping is exactly the quality problems of inwall.Need after scrapping to make new cold mould, and centrifugal casting is compared with cold mould with the static state casting with cold mould, required precision is high, and manufacturing process is complicated, and manufacturing cost is expensive.Renew if in a single day cold mould cracks just to scrap, can cause very large waste, increased production cost.
Summary of the invention
It is simple that the technical issues that need to address of the present invention provide a kind of technique, implements the easily renovation technique of centrifugal casting roll usefulness cold mould.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
The centrifugal casting roll renovation technique of cold mould is characterized in that comprising following processing step:
A, scrap the cold mould reaming: to the cold mould reaming of scrapping, remove on the cold type inner wall and be with defective material, guarantee that the defective that the cold type inner wall impact is used can eliminate fully, the surface roughness of cold mould endoporus is Ra1.6～Ra3.2 after the processing.
B, produce corresponding neck bush: produce the neck bush of external diameter and cold mould internal diameter interference fit, value of interference fit is 0.2mm～0.5mm, and the internal diameter of neck bush is corresponding with the external diameter blank dimension of roll; The surface roughness of neck bush is Ra1.6～Ra3.2;
C, assembling: cold mould and neck bush adopt hot-mounting process, first cold mould are carried out heat temperature raising and process, and when the cold mould temperature rises to 400 ℃～450 ℃, neck bush are press-fited to the cold mould endoporus;
D, fixing: after the cold mould that assembling is finished and neck bush are cooled to normal temperature, fix with some junction of the edges of two sheets of paper screws at the periphery at neck bush external diameter and cold mould internal diameter seam crossing two ends.
Further improvement of the present invention is: described neck bush is selected the material identical or close with cold mould.
Because the technological progress of having adopted technique scheme, the present invention to obtain is:
The present invention repairs and improves the cold mould of scrapping, and interference fit one neck bush again after the cold mould reaming that will scrap can continue to use, and has prolonged the service life of cold mould, has improved the utilization rate of cold mould.Only just can allow and scrap cold mould and reused by processing a neck bush, the Meteorological of cold mould has reduced more than 70%, has significantly reduced production cost.
Cold mould and neck bush adopt interference fit and at both seam crossing end face junction of the edges of two sheets of paper screw fastened, prevent in the centrifugal casting production process, relatively rotate the carrying out smoothly of assurance production when cold mould and neck bush High Rotation Speed.
Adding the man-hour surface roughness is Ra1.6～Ra3.2, guarantees the fineness on surface, is conducive to cooperate install.Cold mould and neck bush adopt hot-mounting process, take full advantage of the characteristic that material is expanded with heat and contract with cold, and can make things convenient for the assembling of carrying out smoothly interference fit.
The material of neck bush need to be selected the material identical or close with cold mould, can prevent junction of the edges of two sheets of paper screw generation deflection when junction of the edges of two sheets of paper screw is installed, has guaranteed the effect of fixing and locking.
Description of drawings
Fig. 1 is the structural representation after utilizing cold mould that technique of the present invention finishes to repair.
Wherein, 1, neck bush, 2, cold mould, 3, junction of the edges of two sheets of paper screw.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further details:
The centrifugal casting roll renovation technique of cold mould 2 comprises following processing step:
A, scrap cold mould 2 reamings: utilize the mode of machining to enlarge the internal diameter size of scrapping cold mould 2, after enlarging endoporus, guarantee that defective position can be removed fully on the inwall of cold mould 2, namely crack, crackle etc. affect the cold mould 2 normal defectives of using and eliminate fully.Be the assembling effect after not affecting, should guarantee the endoporus fineness of cold mould 2, namely the surface roughness of cold mould 2 endoporus is Ra1.6～Ra3.2 after the processing.
B, produce corresponding neck bush 1: select the material identical or close with cold mould 2 to carry out processing neck bush 1, inner surface and the outer surface roughness of neck bush 1 are Ra1.6～Ra3.2.For preventing in the centrifugal casting production process, neck bush 1 relatively rotates when High Rotation Speed with cold mould 2, affect the quality of product, and neck bush 1 and cold mould 2 are arranged to interference fit.Because neck bush 1 needs interference fit with cold mould 2, add man-hour neck bush 1 outside dimension than the large 0.4mm of internal diameter size of cold mould 2; The internal diameter of neck bush 1 is corresponding with the external diameter blank dimension of centrifugal casting roll.
C, assembling: when carrying out the assembling of interference fit, for reducing resistance, assemble easily and fast, hot-mounting process is selected in the assembling of cold mould 2 and neck bush 1: cold mould 2 is taked the pre-heat treatment, cold mould 2 is heated to 420 ℃, the principle features of utilizing material to expand with heat and contract with cold, the interior hole dimension of cold mould 2 can swell on the original basis to some extent, and in time press-fit neck bush 1 to cold mould 2 endoporus this moment.
D, fixing: neck bush 1 is positioned in the cold mould 2, after bulk temperature is reduced to room temperature, some junction of the edges of two sheets of paper screws 3 are installed in the border on the periphery at neck bush 1 external diameter and cold mould 2 internal diameter seam crossing two ends, guarantee the fixing and locking effect, the relative sliding dislocation occurs in neck bush 1 and cold mould 2 when preventing High Rotation Speed, affects product quality.
So far, the repairing and reusing technique of cold mould is finished.Cold mould after the reparation can put into production use again.Utilize the structural representation of the cold mould after reparation of the present invention is finished as shown in Figure 1.
Utilize the present invention, can repeatedly repair cold mould, under the prerequisite that does not affect production, prolong the service life of cold mould, improve the cold mould utilization rate, reduce production costs.
The present invention goes for barrel length less than all centrifugal casting roll cold moulds of 5000mm.
Claims (2)
1. centrifugal casting roll is characterized in that comprising following processing step with the renovation technique of cold mould:
A, scrap the cold mould reaming: to cold mould (2) reaming of scrapping, remove on cold mould (2) inwall and be with defective material, the defective that guarantees cold mould (2) inwall impact use can be eliminated fully, and the surface roughness of cold mould (2) endoporus is Ra1.6～Ra3.2 after the processing;
B, produce corresponding neck bush: produce the neck bush (1) of external diameter and cold mould (2) internal diameter interference fit, value of interference fit is 0.2mm～0.5mm, and the internal diameter of neck bush (1) is corresponding with the external diameter blank dimension of roll; The surface roughness of neck bush (1) is Ra1.6～Ra3.2;
C, assembling: cold mould (2) adopts hot-mounting process with neck bush (1), first cold mould (2) is carried out heat temperature raising and processes, and when cold mould (2) temperature rises to 400 ℃～450 ℃, neck bush (1) is press-fited to cold mould (2) endoporus;
D, fixing: after the cold mould (2) that assembling is finished and neck bush (1) are cooled to normal temperature, fixing with some junction of the edges of two sheets of paper screws (3) at the periphery at neck bush (1) external diameter and cold mould (2) internal diameter seam crossing two ends.
2. centrifugal casting roll according to claim 1 is with the renovation technique of cold mould, and it is characterized in that: described neck bush (1) is selected the material identical or close with cold mould (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310212941.7A CN103350313B (en) | 2013-05-31 | 2013-05-31 | Centrifugal casting roll cold mould renovation technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310212941.7A CN103350313B (en) | 2013-05-31 | 2013-05-31 | Centrifugal casting roll cold mould renovation technique |
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| CN103350313A true CN103350313A (en) | 2013-10-16 |
| CN103350313B CN103350313B (en) | 2016-05-11 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827238A (en) * | 2015-04-10 | 2015-08-12 | 广西鱼峰水泥股份有限公司 | Repair method of plate type feeder eccentric pair wheel |
| CN104865022A (en) * | 2015-05-18 | 2015-08-26 | 共享装备有限公司 | Casting cavity opening end internal feeding detection method |
| CN109175882A (en) * | 2018-10-20 | 2019-01-11 | 共享装备股份有限公司 | Ironcasting inlays method for repairing and mending |
| CN109514171A (en) * | 2018-10-31 | 2019-03-26 | 西安煤矿机械有限公司 | A kind of restorative procedure of planet carrier internal spline |
| CN109592335A (en) * | 2019-01-09 | 2019-04-09 | 昆山世度机械科技有限公司 | A kind of belt conveyor line driving roller and its manufacture craft |
| CN112705909A (en) * | 2020-11-30 | 2021-04-27 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of cold mold for disc centrifuge |
| CN113697099A (en) * | 2021-06-11 | 2021-11-26 | 昌河飞机工业（集团）有限责任公司 | Repairing structure and method for damaged inner surface of helicopter root bushing |
| CN113910006A (en) * | 2021-09-28 | 2022-01-11 | 内蒙古联晟新能源材料有限公司 | Method for repairing surface quality of working roller |
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| CN102699619A (en) * | 2012-06-29 | 2012-10-03 | 南车戚墅堰机车有限公司 | Method for repairing cam axle hole of diesel engine |
| CN102699620A (en) * | 2012-06-29 | 2012-10-03 | 南车戚墅堰机车有限公司 | Method for repairing cylinder bore of diesel engine |
| CN103028889A (en) * | 2012-12-25 | 2013-04-10 | 西南铝业（集团）有限责任公司 | Repair method for internal sleeve of extrusion cylinder |
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| DE1235118B (en) * | 1962-09-19 | 1967-02-23 | Dr Otto Becken | Method for restoring worn bodies or for producing rotating bodies, in particular rollers |
| JPH04159028A (en) * | 1990-10-22 | 1992-06-02 | Daido Steel Co Ltd | Repair method for rolling roll |
| CN1065618A (en) * | 1991-04-11 | 1992-10-28 | 王加新 | The method that pipe type oil pump batch is repaired |
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| CN102699619A (en) * | 2012-06-29 | 2012-10-03 | 南车戚墅堰机车有限公司 | Method for repairing cam axle hole of diesel engine |
| CN102699620A (en) * | 2012-06-29 | 2012-10-03 | 南车戚墅堰机车有限公司 | Method for repairing cylinder bore of diesel engine |
| CN103028889A (en) * | 2012-12-25 | 2013-04-10 | 西南铝业（集团）有限责任公司 | Repair method for internal sleeve of extrusion cylinder |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827238A (en) * | 2015-04-10 | 2015-08-12 | 广西鱼峰水泥股份有限公司 | Repair method of plate type feeder eccentric pair wheel |
| CN104865022A (en) * | 2015-05-18 | 2015-08-26 | 共享装备有限公司 | Casting cavity opening end internal feeding detection method |
| CN104865022B (en) * | 2015-05-18 | 2018-02-16 | 共享装备有限公司 | Feeding detection method inside a kind of casting cavity openend |
| CN109175882A (en) * | 2018-10-20 | 2019-01-11 | 共享装备股份有限公司 | Ironcasting inlays method for repairing and mending |
| CN109514171A (en) * | 2018-10-31 | 2019-03-26 | 西安煤矿机械有限公司 | A kind of restorative procedure of planet carrier internal spline |
| CN109592335A (en) * | 2019-01-09 | 2019-04-09 | 昆山世度机械科技有限公司 | A kind of belt conveyor line driving roller and its manufacture craft |
| CN112705909A (en) * | 2020-11-30 | 2021-04-27 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of cold mold for disc centrifuge |
| CN113697099A (en) * | 2021-06-11 | 2021-11-26 | 昌河飞机工业（集团）有限责任公司 | Repairing structure and method for damaged inner surface of helicopter root bushing |
| CN113697099B (en) * | 2021-06-11 | 2024-10-08 | 昌河飞机工业（集团）有限责任公司 | Repair structure and method for damaged inner surface of helicopter rotor root bushing |
| CN113910006A (en) * | 2021-09-28 | 2022-01-11 | 内蒙古联晟新能源材料有限公司 | Method for repairing surface quality of working roller |
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| CN103350313B (en) | 2016-05-11 |
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