CN109048200A - The method of the reparation trolley coach brake disc fire check of the bionical locking pinning of laser - Google Patents
The method of the reparation trolley coach brake disc fire check of the bionical locking pinning of laser Download PDFInfo
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- CN109048200A CN109048200A CN201810748595.7A CN201810748595A CN109048200A CN 109048200 A CN109048200 A CN 109048200A CN 201810748595 A CN201810748595 A CN 201810748595A CN 109048200 A CN109048200 A CN 109048200A
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- bionical
- brake disc
- laser
- locking pinning
- crack
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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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- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Heat Treatment Of Articles (AREA)
- Braking Arrangements (AREA)
Abstract
The present invention relates to the methods that a kind of bionical locking pinning of laser repairs brake disc surface fire check, it is characterised in that is greater than the expansion crackle of 5mm for brake disc surface length, prepares multiple locking pinning points along crack growth direction；There is the working region that length is less than 5mm short crack, the netted bionical cell cube that preparation is made of circular bionical cell cube and bionical bar element body for brake disc surface.The present invention efficiently solves brake disc reparation, and time-consuming, the problem of more hardly possiblies of consumptive material are repaired, length is more than that the locking pinning point being distributed on 5mm crackle helps to discharge the concentrated stress for making crack initiation, the dotted nail point of crack tip preparation simultaneously is so that crack initiation is more difficult, crackle of the region surface of ring strip by length less than 5mm is enclosed in inside meshy surface, short crack can be effectively prevent further to grow up and change the stress distribution of brake disc surface, reduce non-preparation unit blank surface stress, further prevents the cracking of crackle.
Description
Technical field
The invention belongs to low speed rail brake disc of passenger car recovery technique fields, are related to a kind of repairing for bionical locking pinning of laser
The method of rerail road brake disc of passenger car fire check.
Background technique
Low speed rail car foundation brake is all made of disc brake, low speed rail train below for 200Km/h,
The general brake apparatus using cast iron brake disk and powder metallurgy brake pad pairing.Brake disc is most important in disc brake
Part, it must convert frictional heat energy for huge train momentum by the friction with brake lining, and dissipate heat into surrounding
In environment.Its structure had both required good frictional behaviour, and required have good heat crack resistance, also required to have good
Ventilation and heat performance.To low speed rail brake disc of passenger car structure, the factor considered first is that must have good thermal expansion properties,
To reduce the thermal stress generated when braking to greatest extent, and the disk body material of brake disc has significant shadow to the brake disc service life
It rings.When braking, occurs biggish temperature gradient in brake disc, brake disc is undergone multiple thermal stress by great thermal stress
Circulation, brake disc just will appear fatigue failure.Speed per hour 200KM/h trolley coach brake disc failure below is with fatigue crack length
It is criterion with the degree of wear, i.e., maximum crack length is no more than 50mm, and crackle is not less than 10mm away from plate edge, and disc thickness is not
Less than 112mm, uneven wear is no more than 7mm.In addition the fire check of brake disc surface is mainly by length 30-50mm, width 0.2-
0.6mm, depth 1-6mm cause the segmentation crack composition for expanding crackle and be less than 5mm throughout the length of brake disc surface of failure.By
It is different with quantity in brake disc surface length in segmentation crack and expansion crackle, therefore, it is extremely difficult to using single restorative procedure
Requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of reparation trolley coach brake discs of the bionical locking pinning of laser
The method of fire check, this method are able to solve low speed rail brake disc of passenger car because fatigue crack length, quantity and depth difference are made
At be difficult to the problem of regenerating.
To solve the above-mentioned problems, the method that the bionical locking pinning of laser of the invention repairs brake disc surface fire check,
It is characterized in that being greater than the expansion crackle of 5mm for brake disc surface length, multiple locking pinnings are prepared along crack growth direction
Point；There is the working region that length is less than 5mm short crack for brake disc surface, preparation is by circular bionical cell cube and bionical
The netted bionical cell cube that bar element body is constituted.
It is greater than the expansion crackle of 5mm for brake disc surface length, prepares B class locking pinning point at two tips of crackle,
Its surface diameter R3For 2-3mm, depth H3For 0.4-0.6mm；Region between two B class locking pinning points prepares A class locking
Pinning point；In A class locking pinning point prepared by region of the crack width less than 0.4mm, surface diameter R1For 0.6-0.8mm,
Depth H1For 2-4mm, space D1For 3-5mm；In A class locking pinning point prepared by region of the crack width greater than 0.4mm, table
Face diameter R2For 0.8-1.5mm, depth H2For 3-5mm, space D2For 5-7mm.
The B class locking pinning point section is U-shaped, is prepared with the method for a laser melting, laser machines energy
Density is 4.55-6.03J/mm2, laser frequency 2.5-3.5HZ, is processed 2 seconds.
The A class locking pinning point section is deep v-shaped, melts the solidifying method for adding multiple cladding pure iron powder using 3 times
Preparation, until the pinning point processed is higher than 0.1 millimeter of surface；It is 8-12J/mm that its consolidation stage, which laser machines energy density,2,
Laser frequency is 2.5-3.5Hz, every time processing 2 seconds；Its multiple cladding stage laser processing energy density is 8.05J-14J/
mm2, laser frequency 2.5-3.5Hz, each processing 3 seconds.
The working region for being less than 5mm short crack for occurring length in brake disc, the circular bionical cell cube of starting with most
Multiple inclined bionical cell cubes of strip in the same direction are prepared in annulus between the cyclic annular bionical cell cube of great circle, if adjacent two strips
Angle between the starting point and revolving body circle center line connecting of bionical cell cube is A angle theta 1, and θ 1 is 9 ° -18 °, if the bionical list of strip
The angle of first body and machining starting point circle tangent line is B angle theta 2, and θ 2 is 15 ° -30 °.
The section of the bionical cell cube of strip is arch, sectional aspect ratio 0.8-1.05, using laser melting method
Preparation, laser add function metric density to be 6.63-8.05J/mm2, laser frequency 2.5-3.5Hz, scanning speed 1-
2.0mm/s。
The spacing and A angle theta 1 of the cyclic annular bionical cell cube of the annulus inner circle are less than the number of 5mm short crack according to length
To select.
It draws on the surface away from braking plate edge 50mm with length as 20mm circular arc line；Region is passed through for circular arc line, when short
When crackle number is less than 3, the space D of the bionical cell cube of annular shape used in annulus3It is 20-30 millimeters, A angle theta 1 is
12°-18°；When short crack number is greater than 3, the space D of the bionical cell cube of annular shape used in annulus3For 15-20 milli
Rice, A angle theta 1 are 9 ° -12 °.
The present invention changes the method that brake disc is repaired in existing full surface overlaying, uses one kind with bionical thought
The method of locking pinning is more than the crackle of 5mm using single locking pinning method to length；Crackle to length less than 5mm is adopted
With full surface biomimetic intensifying method.It efficiently solves brake disc and repairs the problem of time-consuming, and the more hardly possiblies of consumptive material are repaired.Length is more than
Locking pinning point on 5mm crackle has compared with the higher intensity of parent, and expands on direction discrete point at a certain distance in crackle
Cloth, such distribution, which facilitates release, makes the concentrated stress of crack initiation, at the same the dotted nail point intensity of crack tip preparation compared with
Greatly, so that crack initiation is more difficult.Crackle of the region surface of ring strip by length less than 5mm is enclosed in meshy surface
Portion, such surface effectively prevent that short crack is further grown up and the presence of web elements will change the stress of brake disc surface
Distribution reduces non-preparation unit blank surface stress, further prevents the cracking of crackle.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic diagram that the present invention repairs that brake disc length is more than 5mm expansion crackle using laser technology.
Fig. 2 a, Fig. 2 b are respectively the Longitudinal cross section schematic of A class locking pinning point, B class locking pinning point.
Fig. 3 is the brake disc surface schematic diagram of the invention that the bionical cell cube of looped network shape is prepared using laser technology.
Specific embodiment
As shown in Figure 1,3, the method that the bionical locking pinning of laser of the invention repairs brake disc surface fire check, for system
Moving plate length surface is greater than the expansion crackle of 5mm, and the A class locking pinning point of multiple and different sizes is prepared along crack growth direction,
B class locking pinning point is prepared in crack tip；There is the working region that length is less than 5mm short crack, system for brake disc surface
Spare ring network shape strengthens unit.
As shown in Fig. 2 a, Fig. 2 b, the expansion crackle of 5mm is greater than for length, according to crack width difference, using different big
Small A class locking pinning point, section are deep v-shaped.Specifically, it is less than the region of 0.4mm in crack width, the A class lock used
Close the surface diameter R of pinning point1For 0.6-0.8mm, depth H1For 2-4mm, space D1For 3-5mm；It is greater than in crack width
The region of 0.4mm, the A class locking pinning point surface diameter R used2For 0.8-1.5mm, depth H2For 3-5mm, space D2For 5-
7mm；The B class locking pinning point of crack tip, section are U-shaped, surface diameter R3For 2-3mm, depth H3For 0.4-0.6mm.
The A class locking pinning point melts the solidifying method preparation for adding multiple cladding pure iron powder using 3 times, until processing
Pinning point out is higher than 0.1 millimeter of surface；It is 8-12J/mm that its consolidation stage, which laser machines energy density,2, laser frequency is
2.5-3.5Hz processing 2 seconds every time；Its multiple cladding stage laser processing energy density is 8.05J-14J/mm2, laser frequency
For 2.5-3.5Hz, process 3 seconds every time.A class locking pinning point intensity is 512MPa-540Mpa, and 1.2- is improved compared with parent
1.4 times, the service life of brake disc is made to extend 1.1-2 times.
Prepared by the method for laser melting of the B class locking pinning point, laser processing energy density is 4.55-
6.03J/mm2, laser frequency 2.5-3.5HZ are processed 2 seconds.B its intensity of class locking pinning point is 526-533MPa, can be effective
The further expansion for preventing crackle, makes the service life of brake disc further extend 2.1-3.5 times.
The working region for being less than 5mm short crack for occurring length in brake disc is processed in the working region surface by justifying
The netted full surface biomimetic cell cube that cyclic annular bionical cell cube and bionical bar element body are constituted.The circular bionical cell cube of starting
Radius be 100mm, the radius of maximum circular bionical cell cube is 320mm；The circular bionical cell cube of starting and greatest circle
Multiple inclined bionical cell cubes of strip in the same direction are prepared in annulus between cyclic annular bionical cell cube.If adjacent two strips are bionical
Angle between the starting point and revolving body circle center line connecting of cell cube is A angle theta 1, if the bionical cell cube of strip and machining starting point
The angle of circle tangent line is B angle theta 2.The spacing and A angle theta 1 of the cyclic annular bionical cell cube of the annulus inner circle are less than according to length
The number of 5mm short crack selects, specifically: it along the circumferential direction draws with length on the surface away from braking plate edge 50mm as 20mm
Circular arc line, for the region that circular arc line passes through, the annulus space D used when crackle number is less than 33When being 20-30 millimeters,
A angle theta 1 is 12 ° -18 °.The annulus space D used when crackle number is greater than 33When being 15-20 millimeters, A angle theta 1 is
9°-12°。
The section of the bionical cell cube of strip is arch, sectional aspect ratio 0.8-1.05, using laser melting method
Preparation, laser add function metric density to be 6.63-8.05J/mm2, laser frequency 2.5-3.5Hz, scanning speed 1-
2.0mm/s。
Specific repair process is as follows:
Step 1: pre-processing using mechanical milling to the passenger train brake disc surface after experience wear, table is being removed
Flat surface while the various stains in face and oxide skin；
Step 2: being less than the short crack of 5mm for brake disc surface length, according to brake disc surface length less than 5mm's
Crackle number determines the space D of A angle theta 1 and circular bionical cell cube3.Brake disc processing start radius be 100mm,
Away from for D3, maximum radius be 320mm the bionical cell cube of annular shape, the inclined bionical unit of strip in the same direction is prepared in annulus
Body, adjacent two angles (A angle theta 1) between the bionical cell cube starting point of inclined strip and revolving body circle center line connecting in the same direction
It is 9 ° -18 °, angle (B angle) θ 2 of the bionical cell cube of strip and machining starting point circle tangent line is 15 ° -30 °.
Step 3: being more than the expansion crackle of 5mm to length, according to crack width difference, different size of A class locking is prepared
Pinning point, specially crack width are less than the region of 0.4mm, the A class locking pinning point surface diameter R used1For 0.6-
0.8mm, depth H1For 2-4mm, space D1For 3-5mm.Crack width is greater than the region of 0.4mm, the A class locking pinning point used
Surface diameter R2For 0.8-1.5mm, depth H2For 3-5mm space D2For 5-7mm.
Step 4: preparing B class locking pinning point at the tip of above-mentioned expansion crackle, section is U-shaped, surface diameter R3's
For 2-3mm, depth H3For 0.4-0.6mm.
The reparation cast iron brake disk application example such as table 1 of the bionical locking pinning of laser.
Table 1
Claims (8)
1. a kind of method that the bionical locking pinning of laser repairs brake disc surface fire check, it is characterised in that for brake disc surface
Length is greater than the expansion crackle of 5mm, prepares multiple locking pinning points along crack growth direction；There is length for brake disc surface
Less than the working region of 5mm short crack, preparation is made of netted bionical circular bionical cell cube and bionical bar element body
Cell cube.
2. the method that the bionical locking pinning of laser according to claim 1 repairs brake disc surface fire check, feature exist
In the expansion crackle for being greater than 5mm for brake disc surface length, B class locking pinning point, surface are prepared at two tips of crackle
Diameter R3For 2-3mm, depth H3For 0.4-0.6mm；Region between two B class locking pinning points prepares A class locking pinning
Point；In A class locking pinning point prepared by region of the crack width less than 0.4mm, surface diameter R1For 0.6-0.8mm, depth H1
For 2-4mm, space D1For 3-5mm；In A class locking pinning point prepared by region of the crack width greater than 0.4mm, surface diameter
R2For 0.8-1.5mm, depth H2For 3-5mm, space D2For 5-7mm.
3. the method that the bionical locking pinning of laser according to claim 2 repairs brake disc surface fire check, feature exist
It is U-shaped in the B class locking pinning point section, is prepared with the method for a laser melting, laser processing energy density is
4.55-6.03J/mm2, laser frequency 2.5-3.5HZ are processed 2 seconds.
4. the method that the bionical locking pinning of laser according to claim 2 repairs brake disc surface fire check, feature exist
It is deep v-shaped in the A class locking pinning point section, melts the solidifying method for adding multiple cladding pure iron powder using 3 times and prepare, directly
It is higher than 0.1 millimeter of surface to the pinning point processed；It is 8-12J/mm that its consolidation stage, which laser machines energy density,2, laser frequency
Rate is 2.5-3.5Hz, every time processing 2 seconds；Its multiple cladding stage laser processing energy density is 8.05J-14J/mm2, laser
Frequency is 2.5-3.5Hz, every time processing 3 seconds.
5. the method that the bionical locking pinning of laser according to claim 1 repairs brake disc surface fire check, feature exist
Occur the working region that length is less than 5mm short crack, the circular bionical cell cube of starting and maximum annulus on for brake disc
Multiple inclined bionical cell cubes of strip in the same direction are prepared in annulus between the bionical cell cube of shape, if the bionical list of adjacent two strips
Angle between the starting point and revolving body circle center line connecting of first body is A angle theta 1, and θ 1 is 9 ° -18 °, if the bionical cell cube of strip with
The angle of machining starting point circle tangent line is B angle theta 2, and θ 2 is 15 ° -30 °.
6. the method that the bionical locking pinning of laser according to claim 5 repairs brake disc surface fire check, feature exist
It is arch in the section of the bionical cell cube of the strip, sectional aspect ratio 0.8-1.05 is prepared using laser melting method,
Laser adds function metric density to be 6.63-8.05J/mm2, laser frequency 2.5-3.5Hz, scanning speed 1-2.0mm/s.
7. the method that the bionical locking pinning of laser according to claim 5 repairs brake disc surface fire check, feature exist
It is selected according to length less than the number of 5mm short crack in the spacing and A angle theta 1 of the cyclic annular bionical cell cube of the annulus inner circle.
8. the method that the bionical locking pinning of laser according to claim 7 repairs brake disc surface fire check, feature exist
It draws on the surface away from braking plate edge 50mm with length as 20mm circular arc line；Region is passed through for circular arc line, when short crack number
When mesh is less than 3, the space D of the bionical cell cube of annular shape used in annulus3It is 20-30 millimeters, A angle theta 1 is 12 ° -18 °；
When short crack number is greater than 3, the space D of the bionical cell cube of annular shape used in annulus3It is 15-20 millimeters, A angle theta 1
It is 9 ° -12 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810748595.7A CN109048200B (en) | 2018-07-10 | 2018-07-10 | Method for repairing thermal cracks of brake disc of railway passenger car by laser bionic locking pinning |
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|---|---|---|---|
| CN201810748595.7A CN109048200B (en) | 2018-07-10 | 2018-07-10 | Method for repairing thermal cracks of brake disc of railway passenger car by laser bionic locking pinning |
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| CN109048200B CN109048200B (en) | 2020-12-25 |
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| CN110029342A (en) * | 2019-02-27 | 2019-07-19 | 吉林大学 | The method of the compacted iron Moving plate of the bionical regeneration low speed rail car of laser |
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