CN112281156A - Laser casting repair method for conformal mold - Google Patents
Laser casting repair method for conformal mold Download PDFInfo
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- CN112281156A CN112281156A CN202011189033.7A CN202011189033A CN112281156A CN 112281156 A CN112281156 A CN 112281156A CN 202011189033 A CN202011189033 A CN 202011189033A CN 112281156 A CN112281156 A CN 112281156A
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- clamping block
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Laser Beam Processing (AREA)
Abstract
A conformal mold laser casting repair method comprises the following steps: 1) and (3) cutting the damaged part: processing the damaged part of the part to be repaired regularly, removing the damaged area, and cleaning and drying the damaged part after cutting; 2) manufacturing a clamping block: processing an inner curved surface clamping block and an outer curved surface clamping block based on a molded surface model of a part to be repaired, and making a clamping fixture based on the inner curved surface clamping block and the outer curved surface clamping block; 3) installing a clamping block: assembling an inner curved surface clamping block and an outer curved surface clamping block matched with the molded surface of the part to be repaired on the periphery of the part to be repaired, and fixing the clamping blocks by using a clamping fixture; 4) laser casting parts; feeding or spreading powder into the groove of the clamping block, and fusing the powder in the groove of the clamping block and the upper end of the clamped part together by using laser to form; the invention has the beneficial effects that: the upper end of the part is repaired without influencing other parts of the part. Compared with other repairing methods, the method has the advantages of small thermal deformation and small stress.
Description
Technical Field
The invention relates to the technical field of laser casting, in particular to a shape following die laser casting repair method.
Background
With the rapid development of the industry, the components are gradually becoming lighter in weight, more complicated in shape, and satisfying the requirements of high performance and low cost. Because most parts have higher cost and longer processing period, the cost can be greatly reduced by directly repairing the damaged parts for use.
The common repair methods used by parts often include processing treatments such as welding, thermal spraying and the like, but the parts can deform under a smaller thermal stress due to insufficient thickness of the parts, or burn-through phenomenon occurs due to excessive heating in the processing and repairing process, so that the sizes of the parts are seriously influenced, and then the repaired parts can not reach the standard. The laser cladding technology has small heat affected zone of the base material, high cooling speed, compact metallurgical bonding and good controllability, so the laser cladding technology is selected for repairing.
When the part is repaired, due to the problem of additive precision, the volume of the repaired additive is larger than the required volume, the laser repair appearance is determined by surface tension, and under the condition of no constraint, the appearance is uneven, the stress ratio is larger, and the subsequent processing workload is large. Therefore, the inventor provides a conformal laser casting repair method, which utilizes a copper mold to reduce the heat influence of a processing area and has a certain constraint effect on the appearance of the processing area. The shape change of the repaired part is reduced, and the repaired part can be shaped by using the manufactured molded line template, so that a better shape and a longer service life can be obtained. Especially when the thin-wall part is repaired, the deformation is easily caused by slightly larger heat, the existing copper die can absorb the heat, the heat input to the original part of the part is reduced, and the shapes of the part to be repaired and the material increase part are better protected.
Disclosure of Invention
In order to overcome the problems, the invention provides a form-following laser casting repair method which can prevent the part from deforming or burning through in the repair process.
The technical scheme of the invention is as follows:
a conformal mold laser casting repair method is characterized by comprising the following steps:
1) and (3) cutting the damaged part: processing the damaged part of the part to be repaired regularly, removing the damaged area, and cleaning and drying the damaged part after cutting;
2) manufacturing a clamping block: processing an inner clamping block and an outer clamping block based on a molded surface model of a part to be repaired, and making a clamping fixture based on the inner clamping block and the outer clamping block;
3) installing a clamping block: assembling an inner clamping block and an outer clamping block which are matched with the molded surface of the part to be repaired on the periphery of the part to be repaired, and fixing the clamping blocks through a clamping fixture;
4) laser casting parts; feeding or spreading powder into the groove of the clamping block, and fusing the powder in the groove of the clamping block and the upper end of the clamped part together by using laser to form;
5) and (3) post-treatment: and carrying out post-treatment on the parts repaired by laser casting.
The form following laser casting repair method is characterized in that in the step 1), a numerical control milling or linear cutting machining method is adopted to machine the damaged part of the part to be repaired regularly.
The conformal laser casting repair method is characterized in that the assembling surface of the inner clamping block in the step 2) is matched with the inner profile surface of the part to be repaired in a profiling mode, and the assembling surface of the outer clamping block is matched with the outer profile surface of the part to be repaired in a profiling mode.
The conformal mold laser casting repair method is characterized in that a part contour groove to be repaired, a copper mold shaping contour groove and an opening contour groove are respectively arranged on the inner clamping block and the outer clamping block from inside to outside, and a horn-shaped opening is adopted in a notch of the opening contour groove.
The form following laser casting repair method is characterized in that powder feeding in the step 4) is to synchronously feed powder into a groove while laser scanning, and is suitable for repairing parts with thicker part repair areas; the powder spreading is to preset a proper amount of powder in the groove, and is suitable for parts with thinner parts in a part repairing area.
The laser casting repair method for the conformal model is characterized by comprising the following steps: and 5) performing clamp repairing on the repaired part in the step 5), recovering the expected shape of the part, completing part repairing, and detecting.
The invention has the beneficial effects that: the upper end of the part is repaired without influencing other parts of the part. Compared with other repairing methods, the method has the advantages of small thermal deformation and small stress. Compared with the selective laser melting technology, the technology can repair the curved surface. Compared with the laser three-dimensional forming technology, the deformation is small or basically not deformed, only the finished molded line sample plate is used for modifying the shape of the part, and the heat affected zone is small. The copper mold is arranged around the molten part to limit the shape of the molten part, so that the forming precision is equivalent to that of casting, and the copper mold absorbs heat, thereby reducing the problems of deformation, excessive melting and the like caused by excessive heat input.
Drawings
FIG. 1 is a schematic view of a blade to be repaired according to an embodiment of the invention;
FIG. 2 is a schematic view of a clamping block of an embodiment of the invention;
FIG. 3 is a schematic view of an embodiment of the present invention with a clamping block mounted on the outer periphery of the area of the blade to be repaired;
FIG. 4 is a schematic top view of a clamping block and a blade to be repaired after clamping according to an embodiment of the invention;
in the figure: 1-a blade to be repaired, 2-an outer curved surface clamping block, 3-an inner curved surface clamping block, 4-a blade profile groove to be repaired, 5-a copper mold shaping profile groove and 6-an opening profile groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A method for repairing a conformal mold by laser casting mainly comprises the following steps:
1) and (3) cutting the damaged part: processing the damaged part of the part to be repaired regularly, removing the damaged area, and cleaning and drying the damaged part after cutting; and (3) machining the damaged part of the part to be repaired by adopting a numerical control milling or linear cutting machining method in the step 1).
2) Manufacturing a clamping block: processing an inner clamping block and an outer clamping block based on a molded surface model of a part to be repaired, and making a clamping fixture based on the inner clamping block and the outer clamping block; the assembling surface of the inner clamping block in the step 2) is matched with the inner profile surface of the part to be repaired in a copying manner, and the assembling surface of the outer clamping block is matched with the outer profile surface of the part to be repaired in a copying manner; interior grip block and outer grip block are last to be equipped with respectively from inside to outside and to treat repair part profile groove, copper mould design profile groove and opening profile groove, just the notch in opening profile groove adopts loudspeaker form opening, and wherein, the notch in opening profile groove adopts loudspeaker form opening purpose to collect the powder, solves synchronous powder feeding, and the too big problem of powder spot, copper mould design profile groove is vertical, plays the effect of founding design, and copper mould design profile groove slightly is greater than the size of waiting to repair part profile groove, reserves out the machining allowance.
3) Installing a clamping block: and assembling an inner clamping block and an outer clamping block matched with the molded surface of the part to be repaired on the periphery of the part to be repaired, and fixing the clamping blocks by using a clamping fixture.
4) Laser casting parts; feeding or spreading powder into the groove of the clamping block, and fusing the powder in the groove of the clamping block and the upper end of the clamped part together by using laser to form; in the step 4), powder feeding is to synchronously feed the powder into the groove while laser scanning is carried out, so that the powder feeding method is suitable for repairing parts with thicker part repairing areas; the powder spreading is to preset a proper amount of powder in the groove, and is suitable for parts with thinner parts in a part repairing area.
5) And (3) post-treatment: and (5) performing clamp repairing on the repaired part to restore the expected part shape, completing part repairing, and detecting.
The above steps are usually performed sequentially in chronological order.
Examples (as shown in FIGS. 1-4):
repairing a certain turbine rotor blade by using a conformal laser casting repair method (mainly aiming at the damage repair of the blade top):
1) and (3) cutting the damaged part: polishing and flattening the damaged part at the top of the blade so as to remove the damaged area, and cleaning and drying the damaged part after cutting;
2) manufacturing a clamping block: processing an inner curved surface clamping block and an outer curved surface clamping block based on a profile model of the blade, and manufacturing a clamping fixture based on the inner curved surface clamping block and the outer curved surface clamping block;
3) installing a clamping block: assembling an inner curved surface clamping block and an outer curved surface clamping block matched with the molded surface of the blade on the periphery of the blade, and fixing the clamping blocks by a clamping fixture;
4) laser casting parts; feeding or spreading powder into the copper mold shaping contour groove of the clamping block, and melting the powder in the copper mold shaping contour groove of the clamping block and the upper end of the clamped part together by using laser to form;
5) and (3) post-treatment: and (5) performing clamp repairing on the part subjected to laser casting repairing, and detecting.
As shown in FIG. 1, the thickness of the blade to be repaired is 1-2mm, and the thickness of the blade to be repaired is 0.2-0.5 mm.
As shown in fig. 2, the outer curved surface clamping block of the manufactured blade to be repaired, and the inner curved surface clamping block of the manufactured blade to be repaired.
Fig. 3 is a schematic view of the blade to be repaired and the clamping block after being fixed in combination.
As shown in fig. 4, the opening contour groove is larger than the copper mold shaping contour groove, and the copper mold shaping contour groove is larger than the blade contour groove to be repaired.
The laser casting repair process parameters are as follows:
power: 1000 w; the diameter of the light spot: 2 mm; the powder feeding amount is 10 g/min; the powder material comprises the following components: c: 0.5-0.8%; ni: 50-55 percent; cr: 17 to 21 percent; 0.5 to 1 percent of Co; mo: 2.8 to 3.3 percent; al: 0.2 to 0.8 percent; ti: 0.65-1.15%; nb: 4.75-5.5%; b: 0.002-0.006%; 0.2 to 0.35 percent of Mn and 0.2 to 0.35 percent of Si; s: 0.01-0.015%; cu: 0.2 to 0.3 percent; p: 0.01-0.015%; mg: 0.005-0.01%; fe: the balance; the scanning speed is 10 mm/s; cladding thickness: according to the requirement, the repaired size is about 1mm higher than the original size.
And decomposing the shaping tool to repair the shape of the clamp after the laser casting meets the requirements. The repaired rotor operates well.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (6)
1. A conformal mold laser casting repair method is characterized by comprising the following steps:
1) and (3) cutting the damaged part: processing the damaged part of the part to be repaired regularly, removing the damaged area, and cleaning and drying the damaged part after cutting;
2) manufacturing a clamping block: processing an inner clamping block and an outer clamping block based on a molded surface model of a part to be repaired, and making a clamping fixture based on the inner clamping block and the outer clamping block;
3) installing a clamping block: assembling an inner clamping block and an outer clamping block which are matched with the molded surface of the part to be repaired on the periphery of the part to be repaired, and fixing the clamping blocks through a clamping fixture;
4) laser casting parts; feeding or spreading powder into the groove of the clamping block, and fusing the powder in the groove of the clamping block and the upper end of the clamped part together by using laser to form;
5) and (3) post-treatment: and carrying out post-treatment on the parts repaired by laser casting.
2. The conformal laser casting repair method according to claim 1, wherein in the step 1), the damaged part of the part to be repaired is machined regularly by using a numerical control milling or linear cutting machining method.
3. The conformal laser casting repair method according to claim 1, wherein the assembling surface of the inner clamping block in the step 2) is matched with the inner profile of the part to be repaired in a copying manner, and the assembling surface of the outer clamping block is matched with the outer profile of the part to be repaired in a copying manner.
4. The conformal laser casting repair method according to claim 1, wherein the inner clamping block and the outer clamping block are respectively provided with a part contour groove to be repaired, a copper mold shaping contour groove and an opening contour groove from inside to outside, and the notch of the opening contour groove is a trumpet-shaped opening.
5. The conformal mold laser casting repair method according to claim 1, wherein in the step 4), the powder is synchronously fed into the groove while laser scanning is performed, so that the method is suitable for repairing parts with thicker part repair areas; the powder spreading is to preset a proper amount of powder in the groove, and is suitable for parts with thinner parts in a part repairing area.
6. The conformal laser casting repair method according to claim 1, wherein the repair method comprises the following steps: and 5) performing clamp repairing on the repaired part in the step 5), recovering the expected shape of the part, completing part repairing, and detecting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011189033.7A CN112281156B (en) | 2020-10-30 | 2020-10-30 | Laser casting repair method for conformal mold |
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| CN202011189033.7A CN112281156B (en) | 2020-10-30 | 2020-10-30 | Laser casting repair method for conformal mold |
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| CN112281156A true CN112281156A (en) | 2021-01-29 |
| CN112281156B CN112281156B (en) | 2023-01-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138853A (en) * | 2021-03-30 | 2022-10-04 | 中国科学院沈阳自动化研究所 | Repair method for cylinder barrel of actuator oil cylinder |
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| CN111118495A (en) * | 2020-01-17 | 2020-05-08 | 中国航空制造技术研究院 | Method for repairing blade edge by high energy beam |
| CN111451500A (en) * | 2020-04-02 | 2020-07-28 | 航发优材(镇江)增材制造有限公司 | Laser additive repair method for titanium alloy valve rod |
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| US4607150A (en) * | 1984-05-03 | 1986-08-19 | Cincinnati Milacron Inc. | Laser spot welder |
| CN102031513A (en) * | 2009-09-28 | 2011-04-27 | 沈阳大陆激光技术有限公司 | Restoring method of last-stage blade of steam turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138853A (en) * | 2021-03-30 | 2022-10-04 | 中国科学院沈阳自动化研究所 | Repair method for cylinder barrel of actuator oil cylinder |
| CN115138853B (en) * | 2021-03-30 | 2024-03-22 | 中国科学院沈阳自动化研究所 | Repairing method for cylinder barrel of actuator cylinder |
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| CN112281156B (en) | 2023-01-24 |
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