CN114540810A - Clamping device for laser cladding of engine connecting rod and connecting rod repairing method - Google Patents
Clamping device for laser cladding of engine connecting rod and connecting rod repairing method Download PDFInfo
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- CN114540810A CN114540810A CN202210133957.8A CN202210133957A CN114540810A CN 114540810 A CN114540810 A CN 114540810A CN 202210133957 A CN202210133957 A CN 202210133957A CN 114540810 A CN114540810 A CN 114540810A
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- connecting rod
- laser cladding
- supporting block
- shaped support
- engine
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a clamping device for laser cladding of an engine connecting rod and a connecting rod repairing method, wherein the clamping device comprises: the rotary table and a plurality of clamps are uniformly arranged on the rotary table in the circumferential direction; the turntable is fixedly provided with a gear ring, the gear ring is meshed with a driving gear, and the driving gear is driven by a motor device; the fixture comprises a T-shaped support, a positioning shaft, a fixed supporting block and an inserting supporting block, the T-shaped support is inversely fixed on the rotary table, the fixed supporting block and the positioning shaft are fixed on the T-shaped support, the fixed supporting block is located obliquely above the positioning shaft, the fixed supporting block is provided with a positioning pin group, and when the connecting rod cover is clamped, the inserting supporting block is inserted on the T-shaped support. According to the deformation and the out-of-round phenomenon of the big end hole of the connecting rod, the repairing is carried out by adopting a laser cladding method, and the problems of weakened strength of the size-reducing repairing method, environmental pollution caused by an electric brush plating material increasing method and the like are solved.
Description
Technical Field
The invention relates to the technical field of engine connecting rod repair, in particular to a clamping device for laser cladding of an engine connecting rod and a connecting rod repair method.
Background
The engine is the heart of car, is one of car refabrication core spare part, and the connecting rod is one of the key spare part of engine, and single value is higher, exists the refabrication value, because the connecting rod receives alternating load effect such as compression, extension in the course of the work, under this alternating stress effect, the big end hole of connecting rod easily appears out of round phenomenon of deformation, has increased the standard fit clearance with the bent axle, can aggravate the hole deformation and also can influence the stationarity and the reliability of motion transmission simultaneously.
At present, the connecting rod big-end hole is generally repaired by the following method:
size reduction repair method
In the remanufacturing industry, partial enterprises adopt to re-bore defective connecting rod big end holes according to a uniform size standard, eliminate the quality problems of surface abrasion, deformation and size over-tolerance of the connecting rod big end holes, and simultaneously design and produce a special thickened connecting rod tile for assembly and use, thereby achieving the original matching size standard, solving the problem of connecting rod defects and realizing the repair and reuse of the connecting rod.
Nano electric brush plating repairing method
The nano brush plating is a surface engineering technology that one or more insoluble nano particles are added into a brush plating solution, and the nano particles and matrix metal ions are subjected to codeposition and fused to the position of a connecting rod hole by utilizing the brush plating principle.
The above two methods have problems in that:
size reduction repair method
The repair scheme has the defects that on one hand, the aperture of the connecting rod is increased, the tensile strength of the connecting rod is weakened, on the other hand, the repair connecting rod needs to replace a special connecting rod tile, the interchangeability of parts is poor, the market acceptance is not high, and the market batch repair application cannot be realized.
Nano electric brush plating repairing method
Practice proves that the repair method has a good repair effect on the defects of the big-end hole of the connecting rod through the brush plating repair technology, but the roughness and the dimensional accuracy of the surface of a plating layer are difficult to control through the brush plating, most importantly, the brush plating solution contains substances such as acids, heavy metal nickel and the like, so that the repair method does not meet the requirements of environmental impact evaluation and occupational disease risk evaluation, and the repair method is forbidden by the ministry of environmental protection.
Disclosure of Invention
In view of the above disadvantages, the first technical problem to be solved by the present invention is: the clamping device is used for clamping a connecting rod body and a connecting rod cover when the connecting rod is repaired. Based on the same inventive concept, the second technical problem to be solved by the invention is as follows: the laser cladding repair method for the engine connecting rod is provided, the connecting rod can be rapidly repaired by the method, no pollution is generated, and the method is environment-friendly.
In order to solve the first technical problem, the technical scheme of the invention is as follows:
a clamping device for laser cladding repair of an engine connecting rod comprises: the rotary table and a plurality of clamps are uniformly arranged on the rotary table in the circumferential direction;
the turntable is fixedly provided with a gear ring, the gear ring is meshed with a driving gear, and the driving gear is driven by a motor device;
the fixture comprises a T-shaped support, a positioning shaft, a fixed supporting block and an insertion supporting block, the T-shaped support is inversely fixed on the rotary table, the fixed supporting block and the positioning shaft are fixed on the T-shaped support, the fixed supporting block is positioned above the positioning shaft in an inclined mode, the fixed supporting block is provided with a positioning pin group, and when the connecting rod cover is clamped, the insertion supporting block is inserted on the T-shaped support.
Preferably, the locating pin set comprises a fixed pin and a sliding pin which are matched with each other, a sliding groove is formed in the fixed supporting block, the large end of the sliding pin slides in the sliding groove, and a nut is connected to the small end of the sliding pin in a threaded manner.
In order to solve the second technical problem, the technical solution of the present invention is:
a laser cladding repair method for an engine connecting rod comprises the following steps:
s1, collecting the connecting rods to be repaired in batches, measuring the inner diameter of the big-end hole of each connecting rod, and determining the maximum out-of-tolerance diameter;
s2, boring and milling a deformation layer of the large-head hole, wherein the boring and milling amount is larger than the maximum out-of-tolerance diameter;
s3, cleaning the big head hole with a cleaning agent;
s4, filling tile groove holes of the connecting rod with sand clay;
s5, the connecting rod is disassembled, and the disassembled connecting rod cover or connecting rod body is respectively fixed on the clamp;
s6, the motor device drives the driving gear to rotate, the driving gear drives the turntable to rotate, the turntable carries the connecting rod body or the connecting rod cover to be repaired to the laser cladding station to carry out laser cladding operation, and the connecting rod body or the connecting rod cover which is subjected to the laser cladding operation is separated from the laser cladding station;
s7, detaching the connecting rod body or the connecting rod cover which is subjected to the laser cladding operation from the clamp;
s8, removing sand clay in the tile slot;
s9, detecting the coating after laser cladding;
s10, assembling the laser-clad connecting rod body and the connecting rod cover together according to a specified pretightening force, and machining the size of the big-end hole in place;
and S11, replacing new bolts and bearing bushes, and warehousing the connecting rod after the connecting rod is assembled.
Preferably, in step S1, the inner diameter of the large-end hole of each connecting rod is measured from four directions and recorded, and the maximum out-of-tolerance diameter is obtained by comparison.
Preferably, in step S2, the boring and milling amount is less than the single-layer cladding thickness obtained by the adopted laser cladding equipment under the optimal process parameters.
Preferably, in step S3, the cleaning agent is alcohol.
Preferably, in step S6, the alloy powder adopted for the laser cladding operation includes the following components by mass percent:
0.2 to 0.3% of C, 0.032 to 0.040% of O, 0.83 to 0.90% of B, Cr: 16.89-18.89%, Mn: 0.25-0.30%, Mo: 1.03-2.50%, Ni: 5.69-7.69%, Si: 0.9-1.5%, nano TiC particles: 8 to 12 percent, and the balance of Fe.
Preferably, in step S6, the laser cladding process parameters are: the power is 1100-1300W, the scanning speed is 900-1100 mm/min, the rotating speed of a powder disc is 0.8-1.2 r/min, the overlapping rate is 45-50%, the diameter of a laser spot is 2.4mm, and the powder is fed in a synchronous powder feeding mode.
Preferably, in step S9, the coating is observed to have a defect by a scanning electron microscope, the thickness of the coating is measured, and the hardness and the tensile strength of the coating are tested.
Preferably, in step S10, the large head hole is honed to size and to clean the tile slot hole and the burrs at the chamfers.
After the technical scheme is adopted, the invention has the beneficial effects that:
1) according to the deformation and the out-of-round phenomenon of the big end hole of the connecting rod, the repairing is carried out by adopting a laser cladding method, and the problems of weakened strength of the size-reducing repairing method, environmental pollution caused by an electric brush plating material increasing method and the like are solved.
2) The iron-based powder for repairing the connecting rod is provided, so that the cladding coating and a matrix can be guaranteed to form metallurgical bonding, and the cladding coating has excellent wear resistance and strength.
3) The sand clay is used for filling the protective tile slot hole, so that the secondary processing of the tile slot hole is greatly simplified, and the repair efficiency and quality are improved.
4) The batch fixture for repairing the connecting rods is designed, and the repairing efficiency is greatly improved.
5) The remanufacturing and repairing of the connecting rod can be ensured to meet the service performance of the connecting rod through an integral repairing method.
Drawings
FIG. 1 is a schematic structural diagram of a clamping device for laser cladding of an engine connecting rod according to the invention;
FIG. 2 is a schematic structural view of the clamp of FIG. 1 (for clamping a connecting rod cap);
FIG. 3 is a schematic view of the slide pin of FIG. 2;
FIG. 4 is a schematic view of the clamp of FIG. 1 clamping a connecting rod cap;
FIG. 5 is a schematic structural view of the clamp of FIG. 1 (for clamping the connecting rod body);
FIG. 6 is a schematic view of the clamp of FIG. 1 clamping the connecting rod body;
in the figure: 1. a turntable; 11. a ring gear; 2. a clamp; 21. a T-shaped bracket; 22. positioning the shaft; 23. fixing a supporting block; 24. inserting a supporting block; 25. a fixing pin; 26. a slide pin; 27. a chute; 28. a nut; 3. a drive gear; 4. a connecting rod body; 5. and a connecting rod cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in fig. 1, 2 and 5, the laser cladding repair clamping device for the engine connecting rod comprises: the device comprises a rotary table 1 and a plurality of clamps 2 which are uniformly distributed on the rotary table in the circumferential direction;
the turntable 1 is fixedly provided with a gear ring 11, the gear ring 11 is meshed with a driving gear 3, the driving gear 3 is driven by a motor device, and the motor device is a motor or a speed reducer driven by the motor;
the clamp 2 comprises a T-shaped support 21, a positioning shaft 22, a fixed supporting block 23 and an insertion supporting block 24, the T-shaped support 21 is inversely fixed on the turntable 1, the fixed supporting block 23 and the positioning shaft 22 are fixed on the T-shaped support 21, the fixed supporting block 23 is positioned obliquely above the positioning shaft 22, the fixed supporting block 23 is provided with a positioning pin group, and when the connecting rod cover 5 is clamped, the insertion supporting block 24 is inserted on the T-shaped support.
The positioning pin set comprises a fixed pin 25 and a sliding pin 26 which are used in a matching way, a sliding groove 27 is arranged on the fixed supporting block 23, the large end of the sliding pin 26 slides in the sliding groove 27, and as shown in fig. 3, a nut 28 is connected with the small end of the sliding pin 26 in a threaded manner.
As shown in fig. 6, when the link body 4 is clamped, the small end hole of the link body 4 is sleeved on the positioning shaft 22, the large end of the link body 4 is supported on the fixed supporting block 23, the link body 4 is moved until it contacts the fixed pin 25, then the sliding pin 26 is moved along the sliding groove 27 until the sliding pin 26 contacts the link body 4, and the nut 28 is tightened to lock the position of the sliding pin 26, so that the link body 4 is fixedly clamped on the clamp 2. When the link body 4 is removed, the nut 28 is unscrewed, the slide pin 26 is moved away from the link body 4 along the slide groove 27, and then the small end hole of the link body 4 is released from the positioning shaft 22, thereby completing the removal of the link body 4.
As shown in fig. 4, when the link cover 5 is clamped, the insertion support block 24 is inserted into the T-shaped bracket 21, the link cover 5 is supported between the fixed support block 23 and the insertion support block 24, the link cover 5 is moved until it contacts the fixed pin 25, then the sliding pin 26 is moved along the sliding groove 27 until the sliding pin 26 contacts the link cover 5, and the nut 28 is tightened to lock the position of the sliding pin 26, thereby fixedly clamping the link cover 5 to the jig 2. When removing the link cap 5, the nut 28 is unscrewed, the slide pin 26 is moved away from the link cap 5 along the slide groove 27, and then the link cap 5 is taken out, completing the removal of the link cap 5.
Example two
The laser cladding repair method for the engine connecting rod is characterized by comprising the following steps of:
and S1, collecting the connecting rods to be repaired in batches, measuring and recording the inner diameter of the big-end hole of each connecting rod from four directions, and comparing to obtain the maximum out-of-tolerance diameter. The included angle between two adjacent directions is 45 degrees, and the diameter of the big-end hole can also be measured from six directions or eight directions.
And S2, boring and milling the deformation layer of the large-head hole, wherein the boring and milling amount is larger than the maximum out-of-tolerance diameter, so that the deformation amount is completely removed.
And S3, cleaning the processed surface by using absolute ethyl alcohol, removing impurities such as oxides, oil stains and the like, and completely removing the oil stains and sediments remained in the oil duct.
S4, filling the slotted hole of the connecting rod tile with sand clay, and pressing and shaping the connecting rod tile by a scraper to clean the redundant clay. The sand clay can not crack and shrink after being shaped, and can isolate cladding powder from entering the tile slot hole.
And S5, the connecting rod is disassembled, and the disassembled connecting rod cover 4 or connecting rod body 5 are respectively fixed on the clamp 2.
And S6, the motor device drives the driving gear 3 to rotate, the driving gear 3 drives the turntable 1 to rotate, the turntable 1 conveys the connecting rod body 4 or the connecting rod cover 5 to be repaired to a laser cladding station for laser cladding operation, and the connecting rod body 4 or the connecting rod cover 5 which is subjected to the laser cladding operation is taken away from the laser cladding station to uninterruptedly repair the connecting rod body 4 or the connecting rod cover 5.
And S7, removing the connecting rod body 4 or the connecting rod cover 5 which is subjected to the laser cladding operation from the clamp 2.
And S8, removing the sand clay in the tile slot. The sand clay is heated, agglomerated and solidified in the laser cladding process, but cannot be adhered to the connecting rod body 4 or the connecting rod cover 5, and the sand clay falls off from the tile slot hole by knocking at the expansion section.
And S9, detecting the coating after laser cladding. The heat deformation of the clad connecting rod is small, the defects of compact coating, no crack and the like are observed by adopting a scanning electron microscope, whether the thickness of the coating meets the requirement or not is measured, and whether the hardness and the tensile strength of the coating meet the requirement or not is tested. The hardness is measured by a hardness tester, according to a third strength theory, the allowable shear stress [ tau ] is 0.5 ×. the allowable yield stress [ sigma ], and the shear strength of the coating is measured by a shear tester to obtain the actual tensile strength of the coating.
S10, assembling the laser-clad 4 and the connecting rod cover 5 together according to a specified pretightening force, honing the large head hole to process the size in place, meeting the requirements on cylindricity and roughness, and cleaning burrs at the tile slot hole and the chamfer.
And S11, replacing new bolts and bearing bushes, assembling the connecting rod according to GB/T28679, and packaging and warehousing the connecting rod. In step S6, the alloy powder used for the laser cladding operation comprises the following components in percentage by mass:
0.2 to 0.3% of C, 0.032 to 0.040% of O, 0.83 to 0.90% of B, Cr: 16.89-18.89%, Mn: 0.25-0.30%, Mo: 1.03 to 2.50%, Ni: 5.69-7.69%, Si: 0.9-1.5%, nano TiC particles: 8 to 12 percent, and the balance of Fe.
The wear resistance and toughness of the coating can be greatly improved by adjusting the using amount of each component element in the alloy powder and adding the toughening elements such as Ni, Mo and the like into the alloy powder. The Mo element can play a role in fine grain strengthening and can play a role in inhibiting the formation of coarse and coarse hard structures. The Ni element can promote the transformation of the martensite of the material to the austenite, and the austenite is taken as a toughness phase, so that the toughness of the material can be obviously improved, and the tensile strength of the material is improved. The elements of iron, chromium, molybdenum, carbon and the like in the powder can form high-hardness alloy carbide, so that the hardness and the wear resistance of the coating are improved. The mesh number of the alloy powder is as follows: 100 to 300 mesh. In order to further improve the mechanical property of the coating, a certain amount of nano TiC particles are added into the powder, TiC can further refine grains, the grain refinement enables the number of grain boundaries to be increased and the area to be increased, the grain boundaries can be strengthened, and the tensile strength of the coating is further improved. Before laser cladding operation, alloy powder and nano TiC particles are prepared into cladding composite powder with a micro-nano structure by using a planetary ball mill (cladding means that nano TiC (small particles) are adhered to the surface of iron-based powder (large particles)), and the cladding composite powder is uniformly distributed and dried in a vacuum drying oven for later use.
In step S6, the laser cladding process parameters are: the power is 1100-1300W, the scanning speed is 900-1100 mm/min, the rotating speed of a powder disc is 0.8-1.2 r/min, the overlapping rate is 45-50%, the diameter of a laser spot is 2.4mm, and the powder is fed in a synchronous powder feeding mode.
In step S2, the boring and milling amount should be smaller than the thickness of the single layer coating obtained by the laser cladding equipment under the optimal process parameters, because the sub-surface layer with the optimal performance can be clad after machining.
The application has the following advantages:
1) according to the deformation and the out-of-round phenomenon of the big end hole of the connecting rod, the repairing is carried out by adopting a laser cladding method, and the problems of weakened strength of the size-reducing repairing method, environmental pollution caused by an electric brush plating material increasing method and the like are solved.
2) The iron-based powder for repairing the connecting rod is provided, so that the metallurgical bonding between the cladding coating and the matrix can be ensured, and the cladding coating has excellent wear resistance and strength.
3) The sand clay is used for filling the protective tile slot hole, so that the secondary processing of the tile slot hole is greatly simplified, and the repair efficiency and quality are improved.
4) The batch fixture for repairing the connecting rods is designed, and the repairing efficiency is greatly improved.
5) The remanufacturing and repairing of the connecting rod can be ensured to meet the service performance of the connecting rod through an integral repairing method.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (10)
1. Engine connecting rod laser cladding restores and uses clamping device, its characterized in that includes: the rotary table and a plurality of clamps are uniformly arranged on the rotary table in the circumferential direction;
the turntable is fixedly provided with a gear ring, the gear ring is meshed with a driving gear, and the driving gear is driven by a motor device;
the fixture comprises a T-shaped support, a positioning shaft, a fixed supporting block and an insertion supporting block, the T-shaped support is inversely fixed on the rotary table, the fixed supporting block and the positioning shaft are fixed on the T-shaped support, the fixed supporting block is positioned above the positioning shaft in an inclined mode, the fixed supporting block is provided with a positioning pin group, and when the connecting rod cover is clamped, the insertion supporting block is inserted on the T-shaped support.
2. The clamping device for laser cladding repair of the engine connecting rod is characterized in that the locating pin group comprises a fixing pin and a sliding pin which are used in a matched mode, a sliding groove is formed in the fixing supporting block, the large end of the sliding pin slides in the sliding groove, and the small end of the sliding pin is in threaded connection with a nut.
3. The laser cladding repair method for the engine connecting rod is characterized by comprising the following steps of:
s1, collecting the connecting rods to be repaired in batches, measuring the inner diameter of the big-end hole of each connecting rod, and determining the maximum out-of-tolerance diameter;
s2, boring and milling a deformation layer of the large-head hole, wherein the boring and milling amount is larger than the maximum out-of-tolerance diameter;
s3, cleaning the big head hole with a cleaning agent;
s4, filling tile groove holes of the connecting rod with sand clay;
s5, the connecting rod is disassembled, and the disassembled connecting rod cover or connecting rod body is respectively fixed on the clamp;
s6, the motor device drives the driving gear to rotate, the driving gear drives the turntable to rotate, the turntable carries the connecting rod body or the connecting rod cover to be repaired to the laser cladding station to carry out laser cladding operation, and the connecting rod body or the connecting rod cover which is subjected to the laser cladding operation is separated from the laser cladding station;
s7, detaching the connecting rod body or the connecting rod cover which is subjected to the laser cladding operation from the clamp;
s8, removing sand clay in the tile slot;
s9, detecting the coating after laser cladding;
s10, assembling the laser-clad connecting rod body and the connecting rod cover together according to a specified pretightening force, and machining the size of the big-end hole in place;
and S11, replacing new bolts and bearing bushes, and warehousing the connecting rod after the connecting rod is assembled.
4. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S1, the inner diameter of the large-end hole of each connecting rod is measured from four directions and recorded, and the maximum out-of-tolerance diameter is obtained by comparison.
5. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S2, the boring and milling amount is less than the single-layer cladding thickness obtained by the adopted laser cladding equipment under the optimal process parameters.
6. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S3, the cleaning agent is alcohol.
7. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S6, the laser cladding operation is performed on the alloy powder with the following components in percentage by mass:
0.2 to 0.3% of C, 0.032 to 0.040% of O, 0.83 to 0.90% of B, Cr: 16.89-18.89%, Mn: 0.25-0.30%, Mo: 1.03 to 2.50%, Ni: 5.69-7.69%, Si: 0.9-1.5%, nano TiC particles: 8 to 12 percent, and the balance of Fe.
8. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S6, the laser cladding process parameters are as follows: the power is 1100-1300W, the scanning speed is 900-1100 mm/min, the rotating speed of a powder disc is 0.8-1.2 r/min, the overlapping rate is 45-50%, the diameter of a laser spot is 2.4mm, and the powder is fed in a synchronous powder feeding mode.
9. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S9, the coating is observed for the existence of defects by using a scanning electron microscope, the thickness of the coating is measured, and the hardness and the tensile strength of the coating are tested.
10. The laser cladding repair method for the engine connecting rod as claimed in claim 3, wherein in step S10, the large head hole is honed to process the size in place, and burrs at the tile slot hole and the chamfer are cleaned.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050132569A1 (en) * | 2003-12-22 | 2005-06-23 | Clark Donald G. | Method of repairing a part using laser cladding |
| CN103498149A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of lead screw |
| CN103495737A (en) * | 2013-10-17 | 2014-01-08 | 江苏盛伟模具材料有限公司 | Alloy powder made of micro-nanometer particles through enhanced laser cladding and method for preparing same |
| CN103498143A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of automobile engine crankshaft |
| CN105402243A (en) * | 2015-12-18 | 2016-03-16 | 河北鼎邦机械设备有限公司 | Integrally cast connecting rod of coal mining machine and processing technology of integrally cast connecting rod |
| CN105603416A (en) * | 2014-11-02 | 2016-05-25 | 陈斌 | Gear repair apparatus |
| CN106363341A (en) * | 2016-11-14 | 2017-02-01 | 张家港清研再制造产业研究院有限公司 | Engine connecting rod repairing method |
| CN107175403A (en) * | 2017-07-13 | 2017-09-19 | 山东大学 | A kind of engine crankshaft fillet laser melting coating prosthetic device and method |
| CN206882995U (en) * | 2017-07-13 | 2018-01-16 | 山东大学 | A kind of engine crankshaft fillet laser melting coating prosthetic device |
| CN108397128A (en) * | 2018-05-21 | 2018-08-14 | 魏浩峰 | A kind of bridge construction perforating device and its drilling method |
| CN110102878A (en) * | 2019-06-03 | 2019-08-09 | 燕山大学 | The CMT and laser melting coating combined-repair method of roller mill main axle flat head sleeve inner hole |
| CN210736888U (en) * | 2019-09-25 | 2020-06-12 | 中国人民解放军陆军装甲兵学院 | Bent axle fillet laser cladding prosthetic devices |
| CN112281082A (en) * | 2020-09-24 | 2021-01-29 | 山东镭研激光科技有限公司 | Laser cladding material and train rail laser cladding repair process |
| CN112518128A (en) * | 2020-12-09 | 2021-03-19 | 山东大学 | Clamp and method for high-speed laser cladding remanufacturing of engine connecting rod |
| US20210190223A1 (en) * | 2018-06-08 | 2021-06-24 | S.P.M. Flow Control, Inc. | Cladded valve seat, assembly, and methods for cladding such seat |
-
2022
- 2022-02-14 CN CN202210133957.8A patent/CN114540810B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050132569A1 (en) * | 2003-12-22 | 2005-06-23 | Clark Donald G. | Method of repairing a part using laser cladding |
| CN103498149A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of lead screw |
| CN103498143A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of automobile engine crankshaft |
| CN103495737A (en) * | 2013-10-17 | 2014-01-08 | 江苏盛伟模具材料有限公司 | Alloy powder made of micro-nanometer particles through enhanced laser cladding and method for preparing same |
| CN105603416A (en) * | 2014-11-02 | 2016-05-25 | 陈斌 | Gear repair apparatus |
| CN105402243A (en) * | 2015-12-18 | 2016-03-16 | 河北鼎邦机械设备有限公司 | Integrally cast connecting rod of coal mining machine and processing technology of integrally cast connecting rod |
| CN106363341A (en) * | 2016-11-14 | 2017-02-01 | 张家港清研再制造产业研究院有限公司 | Engine connecting rod repairing method |
| CN107175403A (en) * | 2017-07-13 | 2017-09-19 | 山东大学 | A kind of engine crankshaft fillet laser melting coating prosthetic device and method |
| CN206882995U (en) * | 2017-07-13 | 2018-01-16 | 山东大学 | A kind of engine crankshaft fillet laser melting coating prosthetic device |
| CN108397128A (en) * | 2018-05-21 | 2018-08-14 | 魏浩峰 | A kind of bridge construction perforating device and its drilling method |
| US20210190223A1 (en) * | 2018-06-08 | 2021-06-24 | S.P.M. Flow Control, Inc. | Cladded valve seat, assembly, and methods for cladding such seat |
| CN110102878A (en) * | 2019-06-03 | 2019-08-09 | 燕山大学 | The CMT and laser melting coating combined-repair method of roller mill main axle flat head sleeve inner hole |
| CN210736888U (en) * | 2019-09-25 | 2020-06-12 | 中国人民解放军陆军装甲兵学院 | Bent axle fillet laser cladding prosthetic devices |
| CN112281082A (en) * | 2020-09-24 | 2021-01-29 | 山东镭研激光科技有限公司 | Laser cladding material and train rail laser cladding repair process |
| CN112518128A (en) * | 2020-12-09 | 2021-03-19 | 山东大学 | Clamp and method for high-speed laser cladding remanufacturing of engine connecting rod |
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| CN114540810B (en) | 2024-04-16 |
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