CN112247477A - Method for repairing size out-of-tolerance of inner hole of part - Google Patents
Method for repairing size out-of-tolerance of inner hole of part Download PDFInfo
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- CN112247477A CN112247477A CN202011173282.7A CN202011173282A CN112247477A CN 112247477 A CN112247477 A CN 112247477A CN 202011173282 A CN202011173282 A CN 202011173282A CN 112247477 A CN112247477 A CN 112247477A
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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
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
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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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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Abstract
The invention discloses a part inner hole dimension out-of-tolerance repairing method which comprises the following steps of cleaning the surface of a part inner hole, screening out parts which meet the conditions that the jumping of the part inner hole and the end surface of the inner hole is within 0.015mm, the unilateral dimension out-of-tolerance of the inner hole is within 0.1mm, and the roughness of the inner hole is Ra3.2-Ra6.3; and B, plating chromium on the surface of the inner hole of the part screened in the step A, and repairing the size of the inner hole of the part to meet the requirement in a chromium plating mode. The method can avoid the deformation of the part in the process of repairing the inner hole of the part and ensure the forming quality of the repaired inner hole of the part.
Description
Technical Field
The invention relates to the technical field of inner hole repair, in particular to a method for repairing the size of an inner hole of a part in an out-of-tolerance mode.
Background
After finishing the inner hole of the large-diameter part, the roughness of the inner hole is Ra12.5, which is not in accordance with requirements, the single-side size out-of-tolerance of the inner hole is about phi 0.1mm and exceeds the error range, the out-of-tolerance repair of the inner hole of the part is needed, the repair method of the out-of-tolerance of the inner hole of the part after finishing is generally to perform the reprocessing after surfacing welding the out-of-tolerance part of the inner hole, but when the surfacing type of the part is poor, the phenomenon of large-area cracking can occur after surfacing of the inner hole of the part, and the part can only be scrapped. If the parts are impellers with large diameters, the unit price is high, and the direct economic loss of each part reaches more than ten thousand yuan. Even if the impeller material can be suitable for surfacing, because a surfacing process is generally suitable for a primary machined part and the deformation allowance of the finish machined part is small, the temperature during the surfacing process is very high, the finish machined impeller can be deformed, the deformation and the deformation part are difficult to determine, the shape of an impeller flow channel is influenced, the surfacing difficulty of a key groove of an inner hole of the impeller is large, defects are easy to generate, the repairing difficulty is very large, the impeller repaired by surfacing is deformed generally, and the forming quality cannot be guaranteed.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the method for repairing the size of the inner hole of the part with the size out-of-tolerance is provided, the part is prevented from deforming in the repairing process of the inner hole of the part, and the forming quality of the repaired inner hole of the part is ensured.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for repairing size out-of-tolerance of an inner hole of a part comprises the following steps of A, cleaning the surface of the inner hole of the part, and screening out parts which meet the conditions that the jumping of the inner hole and the end face of the inner hole of the part is within 0.015mm, the single-side size out-of-tolerance of the inner hole is within 0.1mm, and the roughness of the inner hole is Ra3.2-Ra6.3; B. and D, carrying out chromium plating on the surface of the inner hole of the part screened out in the step A, and repairing the size of the inner hole of the part to meet the requirement in a chromium plating mode.
According to the method, the traditional method for repairing the out-of-tolerance inner hole is abandoned, the part deformation caused by overlaying welding of the inner hole of the part is avoided, the out-of-tolerance repair is carried out on the inner hole of the part by adopting a chromium plating process, the method is only suitable for repairing the part with the inner hole and the end face of the inner hole having the jumping within 0.015mm, the unilateral size out-of-tolerance of the inner hole within 0.1mm and the roughness of the inner hole within Ra3.2-Ra6.3, and the stress deformation of the inner hole of the part in the repair process is avoided by the method. Especially for the inner hole of the impeller, if the impeller is subjected to stress deformation, the size of the flow passage of the impeller is seriously influenced, and even the normal use of the impeller is influenced. Although the repair process adopted in the scheme is the existing chromium plating process, the conventional chromium plating process mainly decorates and hardens the workpiece, the chromium plating process is difficult to think of completing the ultra-poor size repair, and the repaired inner hole of the part can be directly used without any machining treatment.
And optimizing, when the runout and the single-side size out-of-tolerance of the inner hole and the end face of the inner hole of the part meet the requirements and only the roughness of the inner hole does not meet the requirements, preprocessing the roughness of the inner hole of the part to enable the roughness of the inner hole to meet the requirements and ensure that the runout and the single-side size out-of-tolerance of the inner hole and the end face of the part after preprocessing still meet the requirements.
Therefore, if the roughness of the inner hole of the part does not meet the requirement, the adhesion force of the chromium on the surface of the inner hole can not meet the requirement during subsequent chromium plating of the inner hole of the part, and the quality requirement of the inner hole of the part can not be met. Therefore, when the jumping of the inner hole and the end face of the inner hole of the part is within 0.015mm and the single-side size out-of-tolerance is within 0.1mm, but the roughness of the inner hole of the part does not meet Ra3.2-Ra6.3, the roughness of the inner hole of the part can meet the requirement by pretreating the inner hole of the part, and the inner hole of the part with the roughness meeting the requirement can be subjected to the next chromium plating process.
In the step A, during pretreatment of the inner hole of the part, when the single-side size out-of-tolerance of the inner hole of the part is within 0.04 mm-0.08 mm, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 by a grinding wheel machining mode, and the single-side size out-of-tolerance of the inner hole of the part after polishing is still within 0.1 mm.
Like this, because preliminary treatment can process the part hole and let its roughness meet the demands, but can let the unilateral size excess difference of part hole bigger after the processing, consequently need adopt reasonable preliminary treatment means to let the excess difference of the part hole after preliminary treatment still satisfy its unilateral size excess difference within 0.1 mm. The single-side size out-of-tolerance of the inner hole of the part is within 0.04-0.08 mm, the machining allowance of the inner hole of the part is relatively small, the inner hole of the part is pretreated by adopting grinding wheel machining, the machining allowance of the inner hole of the part is relatively small by adopting grinding wheel machining, the single-side size out-of-tolerance of the inner hole of the part is within 0.04-0.08 mm, and the single-side size out-of-tolerance of the inner hole of the part after grinding wheel machining is easier to meet the requirement within 0.1 mm. When the grinding wheel machining is specifically adopted, a part can be installed on a sleeping car, then a rotating device provided with the thousand-blade grinding wheel is selected to be installed on an equipment tool post of the sleeping car, the rotation center of a four-claw clamp main shaft is enabled to be coincident with the rotation center of a part inner hole, the part is cut at 20 revolutions per minute and the feeding amount is 0.8mm per revolution, the roughness of the part inner hole is Ra3.2-Ra6.3, and the grinding wheel machining is completed. If the single-side size out-of-tolerance of the inner hole of the part after pretreatment exceeds 0.1mm, the chromium plating process cannot be carried out, because the chromium after chromium plating is finished is thick, the strength and the wear resistance of the inner hole of the part cannot meet the requirements, the inner hole of the part is easily worn and damaged, and the connection stability of the part and the main shaft is not high.
And optimizing, in the step A, when the inner hole of the part is pretreated, when the single-side size out-of-tolerance of the inner hole of the part is less than or equal to 0.04mm, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 in a cutter machining mode, and the single-side size out-of-tolerance of the inner hole of the part after polishing is still within 0.1 mm.
Therefore, when the single-side size out-of-tolerance of the inner hole of the part is less than or equal to 0.04mm, the machining allowance of the inner hole of the part is relatively large, the inner hole of the part can be pretreated by adopting cutter machining, WNMG080404-MF1125 cutters can be selected as the cutters, when the cutters are specifically adopted for machining, the part is installed on a sleeping car and then is installed on a rotary worktable, the part is cut at 100 revolutions per minute, the feeding amount is 0.1mm per revolution, and after the part is subjected to twice feeding machining, the roughness of the inner hole of the part is Ra3.2-Ra6.3. The cutter consumes relatively great surplus when the cutter is to spare part hole preliminary treatment, but the cutter is for adopting the emery wheel, and the cutter installation is simpler, and the operation is also more convenient, consequently adopts the cutter more suitable to the hole restoration of less tolerance relatively.
As optimization, after the inner hole of the part is pretreated, the center straightness of the inner hole of the part is within 0.02mm, the cylindricity of the inner hole of the part is within 0.02mm, and the verticality of the inner hole of the part and the end face is within 0.03 mm.
Therefore, after the inner hole of the part is pretreated, the size tolerance and the shape tolerance of the inner hole of the part can be changed, the inner hole of the pretreated part needs to be detected, the central straightness of the inner hole of the part is controlled within 0.02mm, the cylindricity of the inner hole of the impeller is controlled within 0.02mm, and the verticality of the inner hole of the impeller and the end surface is controlled within 0.03mm, so that the inner hole of the part after chromium plating can meet the requirements of the size tolerance and the shape tolerance, and the part can be directly used without polishing. And for large-diameter parts, the size problem per se exceeds the maximum size which can be borne by the grinding machine, so that the large-diameter parts cannot be subjected to a grinding process on the grinding machine, the shape and size tolerance of the inner hole of the part are required to be controlled during pretreatment, and the inner hole of the part can be directly used without any machining treatment after being repaired.
Preferably, a key groove is formed in the inner hole of the part, a lead block is driven into the key groove of the inner hole of the part before the inner hole of the part is subjected to chromium plating, the key groove of the inner hole of the part is filled with the lead block, and the height of the inner hole connected with the top of the key groove is kept equal to the height of the inner hole.
Like this, when carrying out the out-of-tolerance when restoreing to the part hole that has the keyway, utilize the lead block to fill up the keyway of part hole, the lead block has certain elasticity, can fill up inside the keyway of part hole completely, has guaranteed the integrality of part hole keyway, avoids the part hole to appear the phenomenon of chromium adhesion in the keyway when the chromium plating, has guaranteed the size of part hole keyway.
And optimally, after the inner hole of the part is subjected to chromium plating, a tool is used for removing a lead block in the key groove, and the chromium plating burrs on the inner hole are removed by using a pliers.
Thus, after the inner hole of the part is plated with chromium, the lead block in the key groove is removed, the chromium plating burrs on the inner hole are removed, and the surface of the inner hole of the part is ensured to meet the quality forming requirement.
In conclusion, the beneficial effects of the invention are as follows: the repair method is simple, easy to operate and high in production efficiency, a conventional repair method with out-of-tolerance size is abandoned, the deformation of the part caused by surfacing is avoided, and the out-of-tolerance repair is carried out on the inner hole of the part by adopting a chromium plating process in the scheme, so that the stress deformation of the inner hole of the part in the repair process is avoided; although the repair process adopted in the scheme is the existing chromium plating process, the conventional chromium plating process mainly decorates and hardens the workpiece, and the size repair by the chromium plating process is difficult to be realized.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
fig. 1 is a schematic structural view of parts according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reference numerals in the drawings of the specification include: part 1, inner bore 2. The invention is designed based on the out-of-tolerance of the inner hole of the water pump impeller, so figure 1 is a structural schematic diagram of the impeller. The repair concept of the present invention can be applied to all part bores as long as certain conditions are met before the part bores are repaired.
In the embodiment, the method for repairing the size out-of-tolerance of the inner hole of the part comprises the following steps of A, cleaning the surface of the inner hole 2 of the part 1, and screening out the part which simultaneously meets the conditions that the runout of the inner hole 2 and the end face of the inner hole 2 of the part 1 is within 0.015mm, the single-side size out-of-tolerance of the inner hole is within 0.1mm, and the roughness of the inner hole is Ra3.2-Ra6.3; B. and D, carrying out chromium plating on the surface of the inner hole of the part screened out in the step A, and repairing the size of the inner hole of the part to meet the requirement in a chromium plating mode.
According to the method, the traditional method for repairing the out-of-tolerance inner hole is abandoned, the part deformation caused by overlaying welding of the inner hole of the part is avoided, the out-of-tolerance repair is carried out on the inner hole of the part by adopting a chromium plating process, the method is only suitable for repairing the part with the inner hole and the end face of the inner hole having the jumping within 0.015mm, the unilateral size out-of-tolerance of the inner hole within 0.1mm and the roughness of the inner hole within Ra3.2-Ra6.3, and the stress deformation of the inner hole of the part in the repair process is avoided by the method. Especially for the inner hole of the impeller, if the impeller is subjected to stress deformation, the size of the flow passage of the impeller is seriously influenced, and even the normal use of the impeller is influenced. Although the repair process adopted in the scheme is the existing chromium plating process, the conventional chromium plating process mainly decorates and hardens the workpiece, the chromium plating process is difficult to think of completing the ultra-poor size repair, and the repaired inner hole of the part can be directly used without any machining treatment.
In a specific embodiment, when the runout and the single-side size out-of-tolerance of the inner hole and the end face of the inner hole of the part meet the requirements and only the roughness of the inner hole does not meet the requirements, the roughness of the inner hole of the part is preprocessed, so that the roughness of the inner hole meets the requirements and the runout and the single-side size out-of-tolerance of the inner hole and the end face of the part after preprocessing are ensured to still meet the requirements.
Therefore, if the roughness of the inner hole of the part does not meet the requirement, the adhesion force of the chromium on the surface of the inner hole can not meet the requirement during subsequent chromium plating of the inner hole of the part, and the quality requirement of the inner hole of the part can not be met. Therefore, when the jumping of the inner hole and the end face of the inner hole of the part is within 0.015mm and the single-side size out-of-tolerance is within 0.1mm, but the roughness of the inner hole of the part does not meet Ra3.2-Ra6.3, the roughness of the inner hole of the part can meet the requirement by pretreating the inner hole of the part, and the inner hole of the part with the roughness meeting the requirement can be subjected to the next chromium plating process.
In a specific embodiment, in the step A, when the inner hole of the part is pretreated, when the single-side size out-of-tolerance of the inner hole of the part is within 0.04 mm-0.08 mm, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 by a grinding wheel machining mode, and the single-side size out-of-tolerance of the inner hole of the part after being polished is still within 0.1 mm.
Like this, because preliminary treatment can process the part hole and let its roughness meet the demands, but can let the unilateral size excess difference of part hole bigger after the processing, consequently need adopt reasonable preliminary treatment means to let the excess difference of the part hole after preliminary treatment still satisfy its unilateral size excess difference within 0.1 mm. The single-side size out-of-tolerance of the inner hole of the part is within 0.04-0.08 mm, the machining allowance of the inner hole of the part is relatively small, the inner hole of the part is pretreated by adopting grinding wheel machining, the machining allowance of the inner hole of the part is relatively small by adopting grinding wheel machining, the single-side size out-of-tolerance of the inner hole of the part is within 0.04-0.08 mm, and the single-side size out-of-tolerance of the inner hole of the part after grinding wheel machining is easier to meet the requirement within 0.1 mm. When the grinding wheel machining is specifically adopted, a part can be installed on a sleeping car, then a rotating device provided with the thousand-blade grinding wheel is selected to be installed on an equipment tool post of the sleeping car, the rotation center of a four-claw clamp main shaft is enabled to be coincident with the rotation center of a part inner hole, the part is cut at 20 revolutions per minute and the feeding amount is 0.8mm per revolution, the roughness of the part inner hole is Ra3.2-Ra6.3, and the grinding wheel machining is completed. If the single-side size out-of-tolerance of the inner hole of the part after pretreatment exceeds 0.1mm, the chromium plating process cannot be carried out, because the chromium after chromium plating is finished is thick, the strength and the wear resistance of the inner hole of the part cannot meet the requirements, the inner hole of the part is easily worn and damaged, and the connection stability of the part and the main shaft is not high.
In the specific implementation mode, in the step A, when the single-side size out-of-tolerance of the inner hole of the part is less than or equal to 0.04mm during the pretreatment of the inner hole of the part, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 in a cutter machining mode, and the single-side size out-of-tolerance of the inner hole of the part after polishing is still within 0.1 mm.
Therefore, when the single-side size out-of-tolerance of the inner hole of the part is less than or equal to 0.04mm, the machining allowance of the inner hole of the part is relatively large, the inner hole of the part can be pretreated by adopting cutter machining, WNMG080404-MF1125 cutters can be selected as the cutters, when the cutters are specifically adopted for machining, the part is installed on a sleeping car and then is installed on a rotary worktable, the part is cut at 100 revolutions per minute, the feeding amount is 0.1mm per revolution, and after the part is subjected to twice feeding machining, the roughness of the inner hole of the part is Ra3.2-Ra6.3. The cutter consumes relatively great surplus when the cutter is to spare part hole preliminary treatment, but the cutter is for adopting the emery wheel, and the cutter installation is simpler, and the operation is also more convenient, consequently adopts the cutter more suitable to the hole restoration of less tolerance relatively.
In a specific embodiment, after the part inner hole is pretreated, the central straightness of the part inner hole is within 0.02mm, the cylindricity of the part inner hole is within 0.02mm, and the perpendicularity of the part inner hole and the end face is within 0.03 mm.
Therefore, after the inner hole of the part is pretreated, the size tolerance and the shape tolerance of the inner hole of the part can be changed, the inner hole of the pretreated part needs to be detected, the central straightness of the inner hole of the part is controlled within 0.02mm, the cylindricity of the inner hole of the impeller is controlled within 0.02mm, and the verticality of the inner hole of the impeller and the end surface is controlled within 0.03mm, so that the inner hole of the part after chromium plating can meet the requirements of the size tolerance and the shape tolerance, and the part can be directly used without polishing. And for large-diameter parts, the size problem per se exceeds the maximum size which can be borne by the grinding machine, so that the large-diameter parts cannot be subjected to a grinding process on the grinding machine, the shape and size tolerance of the inner hole of the part are required to be controlled during pretreatment, and the inner hole of the part can be directly used without any machining treatment after being repaired.
In a specific embodiment, a key groove is formed in the inner hole of the part, a lead block is driven into the key groove of the inner hole of the part before the inner hole of the part is subjected to chromium plating, the key groove of the inner hole of the part is filled with the lead block, and the height of the inner hole connected with the top of the key groove is kept equal to the height of the inner hole.
Like this, when carrying out the out-of-tolerance when restoreing to the part hole that has the keyway, utilize the lead block to fill up the keyway of part hole, the lead block has certain elasticity, can fill up inside the keyway of part hole completely, has guaranteed the integrality of part hole keyway, avoids the part hole to appear the phenomenon of chromium adhesion in the keyway when the chromium plating, has guaranteed the size of part hole keyway.
In the specific implementation process, after the inner hole of the part is plated with chromium, a tool is used for removing a lead block in a key groove, and a pliers is used for removing chromium plating burrs on the inner hole.
Thus, after the inner hole of the part is plated with chromium, the lead block in the key groove is removed, the chromium plating burrs on the inner hole are removed, and the surface of the inner hole of the part is ensured to meet the quality forming requirement.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A method for repairing the size of an inner hole of a part in an out-of-tolerance mode comprises the following steps:
A. cleaning the surface of an inner hole of a part, and screening out the part which simultaneously meets the conditions that the runout of the inner hole and the end face of the inner hole of the part is within 0.015mm, the single-side size out-of-tolerance of the inner hole is within 0.1mm, and the roughness of the inner hole is Ra3.2-Ra6.3;
B. and D, carrying out chromium plating on the surface of the inner hole of the part screened out in the step A, and repairing the size of the inner hole of the part to meet the requirement in a chromium plating mode.
2. The method for repairing the out-of-tolerance inner hole size of the part according to claim 1, wherein the method comprises the following steps: when the runout and the single-side size out-of-tolerance of the inner hole and the end face of the inner hole of the part meet the requirements and only the roughness of the inner hole does not meet the requirements, the roughness of the inner hole of the part is preprocessed, so that the runout and the single-side size out-of-tolerance of the inner hole and the end face of the inner hole of the part after preprocessing are ensured to still meet the requirements.
3. The method for repairing the out-of-tolerance inner hole size of the part according to claim 2, wherein the method comprises the following steps: in the step A, when the inner hole of the part is pretreated, when the single-side size out-of-tolerance of the inner hole of the part is within 0.04 mm-0.08 mm, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 by a grinding wheel machining mode, and the single-side size out-of-tolerance of the inner hole of the part after being polished is still within 0.1 mm.
4. The method for repairing the out-of-tolerance inner hole size of the part according to claim 2, wherein the method comprises the following steps: in the step A, when the inner hole of the part is pretreated, when the single-side size out-of-tolerance of the inner hole of the part is less than or equal to 0.04mm, the roughness of the inner hole of the part is restored to Ra3.2-Ra6.3 in a cutter machining mode, and the single-side size out-of-tolerance of the inner hole of the part after polishing is still within 0.1 mm.
5. The method for repairing the size excess of the inner hole of the part according to any one of claims 3 or 4, wherein the method comprises the following steps: after the inner hole of the part is pretreated, the central straightness of the inner hole of the part is within 0.02mm, the cylindricity of the inner hole of the part is within 0.02mm, and the verticality of the inner hole of the part and the end surface is within 0.03 mm.
6. The method for repairing the out-of-tolerance inner hole size of the part according to claim 1, wherein the method comprises the following steps: the key groove is formed in the inner hole of the part, a lead block is driven into the key groove of the inner hole of the part before the inner hole of the part is subjected to chromium plating, the key groove of the inner hole of the part is filled with the lead block, and the height of the lead block at the inner hole connected with the top of the key groove is kept equal to the height of the lead block at the inner hole.
7. The method for repairing the out-of-tolerance inner hole size of the part according to claim 6, wherein the method comprises the following steps: and after the inner hole of the part is plated with chromium, taking off a lead block in the key slot by using a tool, and removing chromium plating burrs on the inner hole by using a clamp.
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| CN202011173282.7A CN112247477A (en) | 2020-10-28 | 2020-10-28 | Method for repairing size out-of-tolerance of inner hole of part |
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