CN114703473A - Temperature closed-loop control laser remanufacturing process for precision parts - Google Patents
Temperature closed-loop control laser remanufacturing process for precision parts Download PDFInfo
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- CN114703473A CN114703473A CN202210262364.1A CN202210262364A CN114703473A CN 114703473 A CN114703473 A CN 114703473A CN 202210262364 A CN202210262364 A CN 202210262364A CN 114703473 A CN114703473 A CN 114703473A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/02—Amorphous alloys with iron as the major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
- B22F2007/068—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts repairing articles
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Abstract
The invention relates to a laser remanufacturing process for a precision part controlled by a temperature closed loop, which comprises the following steps: putting the worn screw rod into a laser cladding mechanism, clamping the screw rod through a clamping rotating device, carrying out visual detection on the screw rod through a visual detector after clamping is completed, determining the worn part of the screw rod, and cladding a layer of iron-based amorphous alloy on the worn part of the screw rod through a laser cladding device matched with a powder feeding device; step two, polishing the cladding layer obtained in the step one; step three: tapping the polished cladding layer in the step two according to the specification of the screw teeth to complete the reconstruction of the screw rod; a layer of iron-based amorphous alloy is cladded at the worn part of the screw in a laser cladding mode, so that the toughness of the repaired part is guaranteed, the repaired part of the screw has high hardness and high wear resistance, and the remanufacturing and processing of precision parts such as the screw are realized.
Description
Technical Field
The invention relates to the field of precision part repair, in particular to a laser remanufacturing and processing process for a precision part under closed-loop temperature control.
Background
The requirements of precision parts are high, particularly for the precision parts of a screw type, the conventional middle-high end screws are subjected to integral heat treatment of an integral single material, the core parts of the screws need high toughness to prevent the screws from being twisted off, the surfaces of the screws need high hardness and high wear resistance to prolong the service life of the screws, the conventional middle-high end screws are mostly made of powder high-speed steel (such as imported powder high-speed steel, the hardness of which is 62HRC, and the reference brand: Japan Toyo Steel Metal plate), the steel is manufactured by a hot isostatic pressing process, and the hot isostatic pressing equipment is extremely expensive (about 1500 ten thousand domestic equipment and about 6000 thousand imported equipment), so that the materials of the middle-high end screws are expensive.
When the high-end screw rod is used, the abrasion condition is easy to occur, most of the high-end screw rods are directly scrapped after abrasion occurs, and therefore the use cost of the high-end screw rod is further increased.
The method for preparing the iron-based amorphous alloy on the surface of a part mainly adopts spraying (supersonic spraying, plasma spraying and the like) and corresponding iron-based amorphous alloy powder, but the greatest problem of the coating obtained by spraying is that the bonding strength between the coating and the part matrix is low, about 60MPa, if the part is stressed greatly in the working process, the coating is easy to fall off, so that the part fails, and the use of the iron-based amorphous alloy is greatly limited.
Based on the above situation, how to use the iron-based amorphous alloy powder for repairing worn screw components, and further reduce the use cost of screws is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a laser remanufacturing process for precise parts with closed-loop temperature control, which is characterized in that a layer of iron-based amorphous alloy is cladded at the worn part of a screw in a laser cladding mode, so that the repaired part of the screw has high hardness and high wear resistance while the toughness of the repaired part is ensured, and the remanufacturing process of the precise parts such as the screw is realized.
In order to achieve the above purpose, the invention adopts the technical scheme that: a laser remanufacturing and processing process for precision parts controlled by temperature closed loops comprises the following steps:
step one, putting the worn screw rod into a laser cladding mechanism, wherein the laser cladding mechanism comprises a closed case with a front door, the middle part of the case is provided with a workbench, the workbench is provided with a clamping and rotating device which is clamped and matched with the screw rod and can rotate the screw rod, the upper part of the case is provided with a laser cladding device matched with the screw rod on the clamping and rotating device, the laser cladding device is matched with a powder feeding device for conveying iron-based amorphous alloy powder, and a visual detection frame is arranged on the laser cladding device, a visual detector is arranged on the visual detection frame, the screw rod is clamped by the clamping and rotating device, the visual detection is carried out on the screw rod by the visual detector after the clamping is finished, the worn part of the screw rod is determined, then cladding a layer of iron-based amorphous alloy on the worn part of the screw rod by matching a laser cladding device with a powder feeding device;
step two, polishing the cladding layer obtained in the step one;
step three: tapping the cladding layer polished in the step two according to the specification of the screw teeth to complete the reconstruction of the screw rod.
Preferably, the iron-based amorphous alloy powder for forming the iron-based amorphous alloy by laser cladding in the step one comprises the following components in percentage by mass: 0.6-1.2% carbon (C); 0.5-1.0% silicon (Si); 0.5-1.0% boron (B); 20-25% chromium (Cr); 18-23% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
Preferably, the iron-based amorphous alloy powder comprises the following components in percentage by mass: comprises the following components in percentage by mass: 0.9% carbon (C); 0.75% silicon (Si); 0.75% boron (B); 22.5% chromium (Cr); 20.5% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
Preferably, the preparation of the iron-based amorphous alloy powder comprises the following steps: weighing pure iron, iron-carbon alloy, ferroboron, silicon blocks, chromium metal blocks and molybdenum rods according to the proportion, putting all raw materials into induction heating for smelting, and after the smelting is finished, carrying out gas atomization or water atomization and then screening to obtain iron-based amorphous alloy powder with the grain diameter of 23-180 mu m.
Preferably, the center of the workbench is also provided with a powder recovery port, and a powder recovery box is matched below the powder recovery port.
Preferably, the laser cladding device comprises a cladding motor and a cladding mounting block which are arranged on the lower side of the upper part of the case, the cladding mounting block is provided with a cladding movable screw rod through a bearing, the cladding movable screw rod is connected with the cladding motor, the cladding movable screw rod is sleeved with a cladding movable block, a laser is arranged below the cladding movable block, the laser is a 3 kilowatt semiconductor laser, the diameter of a light spot is 5mm, and the laser scanning speed of the laser is controlled to be 6mm/s through the rotating speed of the cladding motor.
Preferably, the powder feeding device comprises a powder box arranged on the case, the powder box is connected with a powder feeding pipe, powder spraying installation blocks are arranged at the positions, on the two sides of the laser, of the cladding movable block, a powder sprayer is installed on the powder spraying installation blocks, the powder sprayer is connected with a powder spraying pipe with a vertically downward outlet, and the powder sprayer is connected with the powder feeding pipe through a powder feeding hose.
Preferably, the number of the powder sprayers is two, two powder spraying pipes matched with the two powder sprayers are symmetrical about the laser, and the two powder feeding pipes are connected with the two powder sprayers through two powder feeding hoses.
Preferably, the visual detection frame is arranged on the side surface of the powder spraying installation block, and the height of the visual detection frame is lower than that of the cladding installation block.
Preferably, the clamping rotating device comprises two clamping rotating structures which are symmetrical about the center of the workbench, the clamping rotating structures comprise clamping movable cylinders arranged on the case, the clamping movable cylinders are connected with clamping rotating motors, the clamping rotating motors are connected with clamping turntables, and the clamping turntables are matched with clamping blocks and can enable the clamping blocks to be opened and closed.
The invention has the beneficial effects that:
1. a layer of iron-based amorphous alloy is cladded at the worn part of the screw in a laser cladding mode, so that the toughness of the repaired part is ensured, the repaired part of the screw has high hardness and high wear resistance, and the remanufacturing and processing of precision parts such as the screw are realized; the structural design of the laser cladding mechanism can be matched with visual detection to realize automatic repair of the screw in the closed space.
2. The components and the content of the iron-based amorphous alloy powder are limited, the iron-based amorphous alloy powder is suitable for a workpiece which needs a high-hardness, high-wear-resistance and high-corrosion-resistance laser cladding surface alloy layer, particularly a screw rod, when the workpiece works at the temperature range of-45 ℃ to 500 ℃ for a long time, the obtained laser cladding iron-based amorphous alloy powder has good processing performance, the laser cladding iron-based amorphous alloy with a large area and a certain thickness and without cracks can be obtained under the conditions of no need of preheating and subsequent heat treatment, and the cladding layer has high strength, hardness and wear resistance and good corrosion resistance.
3. The cladding device realizes the movement of the laser through the matching of the motor and the lead screw, so that the laser can be controlled to reach the required scanning speed through the rotating speed of the motor, and meanwhile, the moving distance of the laser can be controlled through controlling the rotating angle of the motor.
4. The powder feeding device is arranged into two powder sprayers, and the powder spraying pipes are symmetrical relative to the laser and can be matched with the bidirectional movement of the laser to spray powder by scanning.
5. The high design of visual detection frame can avoid interfering the removal of laser instrument.
6. The clamping and rotating device adopts the design of two clamping and rotating structures, the two ends of a plurality of screws can be independently clamped and rotated, and then the clamping and rotating device can be matched with a laser to realize all-dimensional laser cladding of the screws.
Drawings
Fig. 1 is a schematic structural diagram of a laser cladding mechanism;
FIG. 2 is a schematic view of a laser cladding apparatus and a powder spraying structure;
fig. 3 is a schematic structural view of the clamping and rotating device.
The text labels shown in the figures are represented as: 1. a chassis; 2. a work table; 3. a clamping and rotating device; 4. a laser cladding device; 5. a powder feeding pipe; 6. a powder box; 7. a powder recovery port; 8. a powder recovery box; 9. a vision inspection rack; 10. a vision detector; 11. cladding and mounting the block; 12. cladding the movable screw rod; 13. cladding the motor; 14. cladding the movable block; 15. cladding a laser; 16. powder spraying installation blocks; 17. a powder sprayer; 18. a powder spraying pipe; 19. a powder feeding hose; 21. clamping the movable cylinder; 22. a clamping rotating motor; 23. clamping the turntable; 24. a clamping block; 25. a screw.
Detailed Description
The present invention is described in detail below for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the description of the present invention is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
The iron-based amorphous alloy powder of the present application was tested to obtain the following examples
Example 1
The iron-based amorphous alloy powder comprises the following components in percentage by mass: 0.6% carbon (C); 0.5% silicon (Si); 0.5% boron (B); 20% chromium (Cr); 18% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
The preparation method of the iron-based amorphous alloy powder comprises the following steps: weighing pure iron, iron-carbon alloy, ferroboron, silicon blocks, chromium metal blocks and molybdenum rods according to the proportion, putting all raw materials into induction heating for smelting, and after the smelting is finished, carrying out gas atomization or water atomization and then screening to obtain iron-based amorphous alloy powder with the grain diameter of 23-180 mu m.
The prepared iron-based amorphous alloy powder is used for laser cladding, a 3-kilowatt semiconductor laser is adopted for laser cladding, the diameter of a light spot is 5mm, the laser scanning speed is 6mm/s, metal test blocks with the laser cladding layer thickness of 0.8mm and 0.25mm are respectively obtained by adjusting the powder feeding speed and subsequent machining, a dye penetrant is adopted to detect flaws on the test blocks, the laser cladding layer has no cracks, a Rockwell hardness tester is adopted to measure the test block with the laser cladding layer thickness of 0.8mm, the cladding layer hardness is 65HRC, the metal test block with the cladding layer thickness of 0.25mm is subjected to a copper accelerated acetate spray test (CASS test) of national standard (GB/T10125), the time of no rust point on the surface is observed, and the result is obtained: within 2200 hours, the surface of the laser cladding layer has no obvious rust points, and after 2200 hours, the surface of the laser cladding layer begins to have obvious rust points.
Example 2
The iron-based amorphous alloy powder comprises the following components in percentage by mass: 0.9% carbon (C); 0.75% silicon (Si); 0.75% boron (B); 22.5% chromium (Cr); 20.5% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
The preparation method of the iron-based amorphous alloy powder comprises the following steps: weighing pure iron, iron-carbon alloy, ferroboron, silicon blocks, chromium metal blocks and molybdenum rods according to the proportion, putting all raw materials into induction heating for smelting, and after the smelting is finished, carrying out gas atomization or water atomization and then screening to obtain iron-based amorphous alloy powder with the grain diameter of 23-180 mu m.
The prepared iron-based amorphous alloy powder is used for laser cladding, a 3-kilowatt semiconductor laser is adopted for laser cladding, the diameter of a light spot is 5mm, the laser scanning speed is 6mm/s, metal test blocks with the laser cladding layer thickness of 0.8mm and 0.25mm are respectively obtained by adjusting the powder feeding speed and subsequent machining, flaw detection is carried out on the test blocks by adopting a dye penetrant, the laser cladding layer has no crack, the hardness of the test block cladding layer with the laser cladding layer thickness of 0.8mm is measured by adopting a Rockwell hardness tester to be 67HRC, the metal test block with the cladding layer thickness of 0.25mm is subjected to a copper accelerated acetate spray test (CASS test) of national standard (GB/T10125), the time of no corrosion point on the surface is observed, and the result is obtained: within 2100 hours, no obvious rust points exist on the surface of the laser cladding layer, and after 2100 hours, the surface of the laser cladding layer begins to generate obvious rust points.
Example 3
The iron-based amorphous alloy powder comprises the following components in percentage by mass: 1.2% carbon (C); 1.0% silicon (Si); 1.0% boron (B); 25% chromium (Cr); 23% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
The preparation method of the iron-based amorphous alloy powder comprises the following steps: weighing pure iron, iron-carbon alloy, ferroboron, silicon blocks, chromium metal blocks and molybdenum rods according to the proportion, putting all raw materials into induction heating for smelting, and after the smelting is finished, carrying out gas atomization or water atomization and then screening to obtain iron-based amorphous alloy powder with the grain diameter of 23-180 mu m.
The prepared iron-based amorphous alloy powder is used for laser cladding, a 3-kilowatt semiconductor laser is adopted for laser cladding, the diameter of a light spot is 5mm, the laser scanning speed is 6mm/s, metal test blocks with the laser cladding layer thickness of 0.8mm and 0.25mm are respectively obtained by adjusting the powder feeding speed and subsequent machining, flaw detection is carried out on the test blocks by adopting a dye penetrant, the laser cladding layer has no crack, the hardness of the test block cladding layer with the laser cladding layer thickness of 0.8mm is measured by adopting a Rockwell hardness tester to be 69HRC, the metal test block with the cladding layer thickness of 0.25mm is subjected to a copper accelerated acetate spray test (CASS test) of national standard (GB/T10125), the time of no corrosion point on the surface is observed, and the result is obtained: within 1900 hours, no obvious rust points exist on the surface of the laser cladding layer, and after 1900 hours, the surface of the laser cladding layer begins to generate the obvious rust points.
Comparative group 1: 316L (note: existing products in the market)
The product formula comprises the following components in percentage by mass: 0.03% carbon (C), 1.0% silicon (Si), 12% nickel (Ni), 18% chromium (Cr), 2.2% molybdenum (Mo), 1.5% manganese (Mn), and the balance iron (Fe), the sum of the weights being 100%.
Comparative group 2: fe55 (Note: existing products in the market)
The product formula comprises the following components in percentage by mass: 0.15% carbon (C), 0.9% boron (B), 1.2% silicon (Si), 2.8% nickel (Ni), 17% chromium (Cr), 0.5% molybdenum (Mo), 0.2% manganese (Mn), 0.19% vanadium (V), and the balance iron (Fe), the sum of the weights being 100%.
Adopting powders of comparison groups 1 and 2, adopting a 3 kilowatt semiconductor laser to carry out laser cladding, enabling the diameter of a light spot to be 5mm and the laser scanning speed to be 6mm/s, respectively obtaining metal test blocks with the thicknesses of the laser cladding layers of the comparison groups 1 and 2 to be 0.8mm and 0.25mm by adjusting the powder feeding speed and subsequent machining, adopting a coloring flaw detection agent to detect flaws of the laser cladding layers, adopting a Rockwell hardness tester to measure the hardness of the cladding layer of the powder test block of the comparison group 1 with the thickness of the laser cladding layer of 0.8mm to be 34HRC, adopting a Rockwell hardness tester to measure the hardness of the cladding layer of the powder test block of the comparison group 2 with the thickness of 0.8mm to be 56HRC, similarly carrying out a national standard (GB/T10125) copper accelerated acetate mist test (CASS test) on the metal test block with the thickness of the powder cladding layer of the comparison group 1 of 0.25mm and the metal test block with the thickness of the powder cladding layer of the comparison group 2 of 0.25mm, the time at which the surface non-rusting points appeared was observed, and the results were obtained: within 1250 hours, the surface of the laser cladding layer of the powder of the comparative group 1 has no obvious rust points, and after 1250 hours, the surface of the laser cladding layer begins to have obvious rust points; within 70 hours, the powder laser cladding layer of comparative group 2 had no obvious rust spots on the surface, and after more than 70 hours, the laser cladding layer surface began to have obvious rust spots.
Through the embodiment and the comparison group, it can be demonstrated that the iron-based amorphous alloy powder obtained by laser cladding has high strength, hardness and wear resistance of the cladding layer of the iron-based amorphous alloy cladding layer, is good in corrosion resistance, can be completely used for repairing a high-performance screw rod, and can reduce the material cost, and the iron-based amorphous alloy powder is used for repairing the screw rod, so that the following repairing and reproducing method is obtained:
a laser remanufacturing and processing process for precision parts controlled by temperature closed loops comprises the following steps:
step one, putting the worn screw rod into a laser cladding mechanism, wherein the laser cladding mechanism comprises a closed case 1 with a front door, a worktable 2 is arranged in the middle of the case 1, a clamping and rotating device 3 which is clamped and matched with the screw rod and can rotate the screw rod is arranged on the worktable 2, the upper part of the case 1 is provided with a laser cladding device 4 matched with a screw rod on the clamping and rotating device 3, the laser cladding device 4 is matched with a powder feeding device for conveying iron-based amorphous alloy powder, and a visual detection frame 9 is arranged on the laser cladding device 4, a visual detector 10 is arranged on the visual detection frame 9, the screw rod is clamped by the clamping and rotating device 3, the visual detection is carried out on the screw rod by the visual detector after the clamping is finished, the abrasion part of the screw rod is determined, then cladding a layer of iron-based amorphous alloy on the worn part of the screw rod by matching a laser cladding device 4 with a powder feeding device;
step two, polishing the cladding layer obtained in the step one;
step three: tapping the cladding layer polished in the step two according to the specification of the screw teeth to complete the reconstruction of the screw rod.
As shown in figure 1, the center of the worktable 2 is also provided with a powder recovery port 7, and a powder recovery box 8 is matched below the powder recovery port 7.
The powder recovery port 7 and the powder recovery box 8 are designed to recover the scattered powder.
As shown in fig. 2, the laser cladding device 4 includes a cladding motor 3 and a cladding mounting block 11 which are arranged on the lower side of the upper part of the case 1, the cladding mounting block 11 is provided with a cladding movable screw rod 12 through a bearing, the cladding movable screw rod 12 is connected with the cladding motor 3, the cladding movable screw rod 12 is sheathed with the cladding movable block 14, a laser 15 is arranged below the cladding movable block 14, the laser 15 is a 3 kw semiconductor laser, the diameter of a light spot is 5mm, and the laser scanning speed of the laser 14 is controlled to be 6mm/s through the rotating speed of the cladding motor 3.
The laser cladding device 4 controls the moving amplitude of the cladding moving block 14 by controlling the rotating angle (the number of turns) of the cladding motor 3, and controls the moving speed of the cladding moving block 14 by controlling the rotating speed of the cladding motor 3, so that the scanning length of the laser 14 can be controlled, the laser description speed of the laser 14 can be controlled to be 6mm/s, and good laser cladding can be realized.
As shown in fig. 1-2, the powder feeding device includes a powder box 6 disposed on a chassis 1, the powder box 6 is connected with a powder feeding pipe 5, the parts of the cladding movable block 14 at both sides of a laser 15 are provided with powder spraying installation blocks 16, a powder sprayer 17 is installed on the powder spraying installation blocks 16, the powder sprayer 17 is connected with a powder spraying pipe 18 with a vertically downward outlet, and the powder sprayer 17 is connected with the powder feeding pipe 5 through a powder feeding hose 19; the number of the powder sprayers 17 is two, two powder spraying pipes 18 matched with the two powder sprayers 17 are symmetrical about the laser 15, and the number of the powder feeding pipes 5 is two and is respectively connected with the two powder sprayers 17 through two powder feeding hoses 19.
Iron-based amorphous alloy powder is fed into the two powder sprayers 17 through the powder feeding pipe 5 and the powder feeding hose 19, the corresponding powder sprayers 17 are controlled to work according to the scanning direction of the laser 14, and then the corresponding powder spraying pipes 18 are used for spraying powder, so that the laser 14 can realize bidirectional laser cladding operation.
As shown in fig. 2, the visual inspection rack 9 is installed on the side surface of the powder spraying installation block 16, and is lower than the cladding installation block 11 in height.
Install visual detection frame 9 on dusting installation piece 16, and highly be less than cladding installation piece 11, so can avoid appearing the problem that visual detection frame 9 interferes the laser instrument activity.
As shown in fig. 3, the clamping and rotating device 3 includes two clamping and rotating structures that are symmetrical about the center of the worktable 2, the clamping and rotating structures include a clamping movable cylinder 21 disposed on the case 1, the clamping movable cylinder 21 is connected with a clamping rotating motor 22, the clamping rotating motor 22 is connected with a clamping turntable 23, and the clamping turntable 23 is matched with a clamping block 24 and enables the clamping block 24 to be opened and closed.
Centre gripping rotating device 3 carries out the centre gripping to the screw rod through a centre gripping rotating-structure at initial time, when 15 scans to melt cover with be close this centre gripping rotating-structure soon at laser instrument, carries out the centre gripping to the other end of screw rod through another centre gripping rotating-structure, and original that centre gripping rotating-structure then contracts through centre gripping activity cylinder 21 and contracts, so can melt the cladding to the screw rod part of original centre gripping, the disposable all-round cladding that the centre gripping rotating device of this application can realize the screw rod.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While the principle and embodiments of the present invention have been described with reference to specific examples, the above description is only for assisting understanding of the method and the core idea of the present invention, and the above description is only a preferred embodiment of the present invention, it should be noted that there are no specific structures which are objectively infinite due to the limitation of the word expression, and it will be obvious to those skilled in the art that various improvements, modifications or changes may be made without departing from the principle of the present invention, and the technical features may also be combined in an appropriate manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (10)
1. A laser remanufacturing and processing process for a precision part controlled by a temperature closed loop is characterized by comprising the following steps:
step one, putting a worn screw into a laser cladding mechanism, wherein the laser cladding mechanism comprises a closed case (1) with a front door, a workbench (2) is arranged in the middle of the case (1), a clamping and rotating device (3) which is matched with the screw in a clamping manner and can enable the screw to rotate is arranged on the workbench (2), a laser cladding device (4) which is matched with the screw on the clamping and rotating device (3) is arranged on the upper portion of the case (1), the laser cladding device (4) is matched with a powder feeding device for conveying iron-based amorphous alloy powder, a visual detection frame (9) is arranged on the laser cladding device (4), a visual detector (10) is arranged on the visual detection frame (9), the screw is clamped by the clamping and rotating device (3), and visual detection is carried out on the screw by the visual detector after clamping is completed, determining the worn part of the screw, and cladding a layer of iron-based amorphous alloy on the worn part of the screw by matching a laser cladding device (4) with a powder feeding device;
step two, polishing the cladding layer obtained in the step one;
step three: tapping the cladding layer polished in the step two according to the specification of the screw teeth to complete the reconstruction of the screw rod.
2. The laser remanufacturing process for the precision part with the temperature closed-loop control function according to claim 1, wherein the iron-based amorphous alloy powder for laser cladding to form the iron-based amorphous alloy in the step one comprises the following components in percentage by mass: 0.6-1.2% carbon (C); 0.5-1.0% silicon (Si); 0.5-1.0% boron (B); 20-25% chromium (Cr); 18-23% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
3. The laser remanufacturing process of a precision part controlled by a temperature closed loop as claimed in claim 2, wherein the iron-based amorphous alloy powder comprises the following components in percentage by mass: comprises the following components in percentage by mass: 0.9% carbon (C); 0.75% silicon (Si); 0.75% boron (B); 22.5% chromium (Cr); 20.5% molybdenum (Mo); the balance being iron (Fe), the sum of the weights being 100%.
4. The laser remanufacturing process of a precision part with closed-loop temperature control as claimed in claim 1, wherein the manufacturing of the iron-based amorphous alloy powder comprises the following steps: weighing pure iron, iron-carbon alloy, ferroboron, silicon blocks, chromium metal blocks and molybdenum rods according to the proportion, putting all raw materials into induction heating for smelting, and after the smelting is finished, carrying out gas atomization or water atomization and then screening to obtain iron-based amorphous alloy powder with the grain diameter of 23-180 mu m.
5. The laser remanufacturing process for the precision part controlled by the temperature in the closed loop mode according to claim 1, wherein a powder recovery port (7) is further formed in the center of the workbench (2), and a powder recovery box (8) is matched below the powder recovery port (7).
6. The laser remanufacturing and processing process for the precise part with the temperature controlled in the closed loop manner as claimed in claim 1, wherein the laser cladding device (4) comprises a cladding motor (3) and a cladding mounting block (11) which are arranged on the lower side of the upper portion of the case (1), the cladding mounting block (11) is provided with a cladding movable screw rod (12) through a bearing, the cladding movable screw rod (12) is connected with the cladding motor (3), the cladding movable screw rod (12) is sleeved with a cladding movable block (14), a laser (15) is arranged below the cladding movable block (14), the laser (15) is a 3 kilowatt semiconductor laser, the diameter of a light spot is 5mm, and the laser scanning speed of the laser (14) is controlled to be 6mm/s through the rotating speed of the cladding motor (3).
7. The laser remanufacturing process for the precise parts under the closed-loop control of the temperature according to claim 6, wherein the powder feeding device comprises a powder box (6) arranged on a case (1), the powder box (6) is connected with a powder feeding pipe (5), the parts of the cladding movable block (14) on two sides of a laser (15) are provided with powder spraying installation blocks (16), a powder sprayer (17) is installed on the powder spraying installation blocks (16), the powder sprayer (17) is connected with a powder spraying pipe (18) with a vertical downward outlet, and the powder sprayer (17) is connected with the powder feeding pipe (5) through a powder feeding hose (19).
8. The laser remanufacturing process for the precision part controlled by the temperature in the closed loop mode according to claim 7, wherein the number of the powder sprayers (17) is two, the two powder spraying pipes (18) matched with the two powder sprayers (17) are symmetrical about the laser (15), the number of the powder feeding pipes (5) is two, and the two powder feeding pipes are respectively connected with the two powder sprayers (17) through two powder feeding hoses (19).
9. The laser remanufacturing process of a precision part with closed temperature loop control as claimed in claim 7, wherein the visual inspection rack (9) is installed on the side of the powder spraying installation block (16) and is lower than the cladding installation block (11).
10. The laser remanufacturing process for the precision parts controlled by the closed loop at the temperature as claimed in claim 1, wherein the clamping rotating device (3) comprises two clamping rotating structures which are symmetrical about the center of the workbench (2), each clamping rotating structure comprises a clamping movable cylinder (21) arranged on the case (1), each clamping movable cylinder (21) is connected with a clamping rotating motor (22), each clamping rotating motor (22) is connected with a clamping turntable (23), and each clamping turntable (23) is matched with a clamping block (24) and enables the clamping block (24) to be opened and closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210262364.1A CN114703473A (en) | 2022-03-17 | 2022-03-17 | Temperature closed-loop control laser remanufacturing process for precision parts |
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| CN202210262364.1A CN114703473A (en) | 2022-03-17 | 2022-03-17 | Temperature closed-loop control laser remanufacturing process for precision parts |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116175081A (en) * | 2023-04-27 | 2023-05-30 | 中国机械总院集团宁波智能机床研究院有限公司 | Worn lead screw repairing device and method for applying same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116175081A (en) * | 2023-04-27 | 2023-05-30 | 中国机械总院集团宁波智能机床研究院有限公司 | Worn lead screw repairing device and method for applying same |
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Application publication date: 20220705 |