CN111271396B - Brake disc with cladding lug on surface and preparation method thereof - Google Patents
Brake disc with cladding lug on surface and preparation method thereof Download PDFInfo
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- CN111271396B CN111271396B CN202010051722.5A CN202010051722A CN111271396B CN 111271396 B CN111271396 B CN 111271396B CN 202010051722 A CN202010051722 A CN 202010051722A CN 111271396 B CN111271396 B CN 111271396B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/121—Discs; Drums for disc brakes consisting of at least three circumferentially arranged segments
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/128—Discs; Drums for disc brakes characterised by means for cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/78—Features relating to cooling
- F16D65/84—Features relating to cooling for disc brakes
- F16D65/847—Features relating to cooling for disc brakes with open cooling system, e.g. cooled by air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/004—Profiled friction surfaces, e.g. grooves, dimples
Abstract
The application provides a brake disc with cladding lugs on the surface, which comprises a brake disc base body and a plurality of cladding lugs, wherein the cladding lugs are uniformly arranged on the outer surfaces of two circular rings of the brake disc base body; the heat dissipation structure also comprises a plurality of scribing grooves and a plurality of thermal stress heat dissipation holes; the preparation method of the brake disc with the cladding lug on the surface is also provided, and the cladding lug is prepared by adopting a synchronous laser cladding method; the Fe60 and the titanium carbide in the cladding lug improve the hardness, the wear resistance, the impact toughness resistance, the heat conductivity, the high temperature resistance, the corrosion resistance and other properties of the cladding lug, thereby reducing the abrasion to the brake disc matrix and reducing the production cost; the scribing groove and the thermal stress radiating holes improve the radiating performance of the brake disc, facilitate chip removal, increase the friction force and improve the braking performance; and the cladding convex block is subjected to component strengthening and process strengthening, so that the braking performance, the wear resistance, the heat dissipation performance and the service life of the brake disc are improved.
Description
Technical Field
The invention relates to the technical field of brake discs, in particular to a brake disc with a cladding lug on the surface and a preparation method thereof.
Background
The automobile brake pad is generally composed of a steel plate, an adhesive heat insulation layer and a friction block. The friction block is composed of a friction material and an adhesive, and is extruded on a brake disc or a brake drum to generate friction when braking, so that the purposes of vehicle deceleration and braking are achieved.
The shape of the brake disc is a circular plate, the brake disc rotates when a vehicle runs, and the brake disc is clamped by the brake disc to generate braking force.
The brake disc is a counterpart of an automobile brake, and is required to have high strength and rigidity, a high and stable friction coefficient, appropriate wear resistance, appropriate heat dissipation, appropriate heat capacity, and the like. Most of the existing automobile brake discs are made of cast iron, and some of the brake discs of high-grade automobiles are expensive in base material, complex in manufacturing process and high in production cost. In order to meet the market requirements, the surface modification is carried out on most automobile brake discs in the market on the premise of reducing the production cost, so that the comprehensive performance of the brake discs can be effectively improved.
Therefore, how to improve the comprehensive properties of the brake disc, including hardness, wear resistance, impact toughness, heat conductivity, high temperature resistance and corrosion resistance, to meet the use requirements under high-load, high-temperature, high-speed and high-corrosion environments, and meet the requirements of social and economic development and technological progress is a technical problem that needs to be solved urgently by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a brake disc with a cladding lug on the surface. The invention also aims to provide a preparation method of the brake disc with the cladding convex blocks on the surface.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a brake disc with cladding lugs on the surface comprises a brake disc base body and a plurality of cladding lugs; a part of the cladding convex blocks are arranged on the circular outer surface of the brake disc base body, and the rest of the cladding convex blocks are arranged on the other circular outer surface of the brake disc base body.
Preferably, the brake disc base body is made of cast iron.
Preferably, the brake disc further comprises a plurality of scribing grooves, a part of the scribing grooves are arranged on the outer circular surface of the brake disc base body, and the rest of the scribing grooves are arranged on the outer circular surface of the brake disc base body;
two adjacent marking grooves on the outer surface of each circular ring of the brake disc base body are uniformly distributed at an interval of 45 degrees.
Preferably, the brake disc further comprises a plurality of thermal stress radiating holes which are uniformly arranged on the circular outer surface of the brake disc base body;
each thermal stress heat dissipation hole is a through hole and is located at the middle position between two adjacent scribing grooves, and the aperture of each thermal stress heat dissipation hole is 5 mm.
Preferably, every three of the cladding lugs on the circular outer surface of each brake disc base body form a group, each group of the cladding lugs is positioned between two adjacent scribing grooves, and each cladding lug is a rectangular block with the length of 10mm, the width of 10mm and the thickness of 3 mm.
Preferably, two mutually symmetrical side surfaces of the cladding convex block are changed into arc surfaces through a fillet, the radius of the fillet is 3mm, and the central symmetry plane of the two arc surfaces passes through the axial center line of the brake disc.
Preferably, three cladding lugs in each group of cladding lugs are arranged in an isosceles triangle, and the thermal stress heat dissipation hole is positioned at the midpoint of the bottom edge line of the isosceles triangle formed by the three cladding lugs.
Preferably, the cladding bump comprises the following components in percentage by mass: SiC: 3.0% -4.0%, C: 4.0% -4.5%, B: 1.5% -2.5%, Si: 2.0-3.0%, Cr: 24.0% -30.0%, Ni: 4.0% -6.0%, W: 2.0% -3.0%, TiC: 5% -6%, Fe: and (4) the balance.
The preparation method of the brake disc with the cladding bump on the surface is characterized by comprising the following steps:
1) weighing SiC powder, C powder, B powder, Si powder, Cr powder, Ni powder, W powder, TiC powder and Fe powder according to a formula, and then uniformly mixing for later use;
2) putting the uniformly mixed powder obtained in the step 1) into a ball milling tank, vacuumizing the ball milling tank, adding argon gas into the ball milling tank as protective gas, adding steel ball balls into the ball milling tank as grinding bodies, adding ethanol with the volume fraction of 95% into the ball milling tank as a grinding aid, performing ball milling at the rotating speed of 240r/min for 5-6 h, and preparing slurry after ball milling;
3) drying the slurry prepared in the step 2) in a drying box, and then screening by using a sieve with the aperture of 2.3 mu m, wherein the undersize is used as cladding powder;
4) blowing the cladding powder prepared in the step 3) onto the annular outer surface of the brake disc base body by a coaxial powder feeding mode and using argon as powder carrying gas to perform synchronous laser cladding treatment, controlling the laser power to be 1200-1700W, controlling the laser scanning speed to be 20-40 mm/min, controlling the powder feeding speed to be 2-4 g/min, controlling the laser spot diameter to be 2-4 mm, and controlling the argon flow to be 5-8L/h, thus preparing the brake disc with the cladding lug on the surface.
Preferably, in the step 4), firstly, a cladding bump is sequentially and one by one prepared on the outer surface of one of the circular rings of the brake disc substrate by adopting synchronous laser cladding treatment in sequence;
and then sequentially preparing cladding lugs one by one on the outer surface of the other circular ring of the brake disc substrate by adopting synchronous laser cladding treatment.
The application provides a brake disc with cladding lugs on the surface, which comprises a brake disc base body and a plurality of cladding lugs, wherein a part of the cladding lugs are arranged on the circular outer surface of the brake disc base body, and the rest of the cladding lugs are arranged on the other circular outer surface of the brake disc base body; the heat dissipation structure also comprises a plurality of scribing grooves and a plurality of thermal stress heat dissipation holes; the cladding lug comprises the following components in percentage by mass: SiC: 3.0% -4.0%, C: 4.0% -4.5%, B: 1.5% -2.5%, Si: 2.0-3.0%, Cr: 24.0% -30.0%, Ni: 4.0% -6.0%, W: 2.0% -3.0%, TiC: 5% -6%, Fe: the balance;
the application also provides a preparation method of the brake disc with the cladding lug on the surface, which adopts a synchronous laser cladding method to prepare the cladding lug;
the cladding lug arranged on the outer surface of the brake disc base body can effectively protect the outer surface of the brake disc base body, the cladding lug reduces the abrasion to the brake disc base body, the requirement on the abrasion resistance required by an automobile during braking is met, the production cost is reduced, the service life of the brake disc is prolonged, and the hardness, the abrasion resistance, the impact toughness, the heat conduction performance, the high temperature resistance, the corrosion resistance and other performances of the cladding lug are improved due to the arrangement of the cladding lug, and the Fe60 and the titanium carbide in the cladding lug, so that the comprehensive performances including the hardness, the abrasion resistance, the impact toughness, the heat conduction performance, the high temperature resistance and the corrosion resistance of the brake disc can be effectively improved;
the surface of the brake disc base body is scribed and punched on the premise of reducing cost and improving performance on the basis of the cast iron brake disc base body, so that the heat dissipation performance of the brake disc is improved, chip removal is facilitated, the friction force between a brake pad and the brake disc is increased, and the braking performance is improved;
the cladding convex block is subjected to component strengthening and process strengthening, and the component strengthening and process strengthening are combined to realize strong combination, so that the braking performance, the wear resistance, the heat dissipation performance and the service life of the brake disc are improved, and the production cost is reduced.
Drawings
Fig. 1 is a front view of a brake disc with a cladding bump on the surface according to an embodiment of the present invention;
FIG. 2 is a rear view of FIG. 1;
fig. 3 is an isometric view of fig. 1.
In the figure: 1 brake disc base body, 2 cladding lug, 3 marking groove, 4 thermal stress louvre.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate the features and advantages of the invention and not to limit the scope of the claims.
The application provides a brake disc with cladding lugs on the surface, which comprises a brake disc base body 1 and a plurality of cladding lugs 2; a part of the number of the cladding convex blocks 2 is arranged on one circular outer surface of the brake disc base body 1, and the rest number of the cladding convex blocks 2 is arranged on the other circular outer surface of the brake disc base body 1.
In one embodiment of the present application, the brake disc base body 1 is made of cast iron.
In an embodiment of the present application, the brake disc with the cladding bump on the surface further includes a plurality of scribing grooves 3, a part of the scribing grooves 3 are disposed on one circular outer surface of the brake disc base body 1, and the rest of the scribing grooves 3 are disposed on the other circular outer surface of the brake disc base body 1;
two adjacent marking grooves 3 on the outer surface of each circular ring shape of the brake disc base body 1 are uniformly distributed at an interval of 45 degrees.
In an embodiment of the present application, the brake disc with the cladding bump on the surface further includes a plurality of thermal stress heat dissipation holes 4, and the plurality of thermal stress heat dissipation holes 4 are uniformly disposed on the circular outer surface of the brake disc base 1;
each thermal stress heat dissipation hole 4 is a through hole and is located at the middle position between two adjacent scribing grooves 3, and the aperture of each thermal stress heat dissipation hole 4 is 5 mm.
In one embodiment of the present application, every three of the cladding bumps 2 on the outer surface of each circular ring shape of the brake disc base body 1 form a group, each group of the cladding bumps 2 is located between two adjacent scribing grooves 3, and each cladding bump 2 is a rectangular block with a length of 10mm, a width of 10mm and a thickness of 3 mm.
In an embodiment of the application, the two mutually symmetrical sides of the cladding convex block 2 are changed into arc surfaces through rounding off, the radius of the rounding off is 3mm, and the central symmetry planes of the two arc surfaces pass through the axial center line of the brake disc.
In an embodiment of the present application, the three cladding bumps 2 in each group of cladding bumps 2 are arranged in an isosceles triangle, and the thermal stress heat dissipation hole 4 is located at a midpoint of a bottom edge line of the isosceles triangle enclosed by the three cladding bumps 2.
In one embodiment of the present application, the cladding bump 2 comprises the following components by mass percent: SiC: 3.0% -4.0%, C: 4.0% -4.5%, B: 1.5% -2.5%, Si: 2.0-3.0%, Cr: 24.0% -30.0%, Ni: 4.0% -6.0%, W: 2.0% -3.0%, TiC: 5% -6%, Fe: and (4) the balance.
The application also provides a preparation method of the brake disc with the cladding convex blocks on the surface, which comprises the following steps:
1) weighing SiC powder, C powder, B powder, Si powder, Cr powder, Ni powder, W powder, TiC powder and Fe powder according to a formula, and then uniformly mixing for later use;
2) putting the uniformly mixed powder obtained in the step 1) into a ball milling tank, vacuumizing the ball milling tank, adding argon gas into the ball milling tank as protective gas, adding steel ball balls into the ball milling tank as grinding bodies, adding ethanol with the volume fraction of 95% into the ball milling tank as a grinding aid, performing ball milling at the rotating speed of 240r/min for 5-6 h, and preparing slurry after ball milling;
3) drying the slurry prepared in the step 2) in a drying box, and then screening by using a sieve with the aperture of 2.3 mu m, wherein the undersize is used as cladding powder;
4) blowing the cladding powder prepared in the step 3) onto the annular outer surface of the brake disc base body 1 by a coaxial powder feeding mode and using argon as powder carrying gas to perform synchronous laser cladding treatment, controlling the laser power to be 1200-1700W, controlling the laser scanning speed to be 20-40 mm/min, controlling the powder feeding speed to be 2-4 g/min, controlling the laser spot diameter to be 2-4 mm, and controlling the argon flow to be 5-8L/h, thereby preparing the brake disc with the cladding lug 2 on the surface.
In an embodiment of the application, in step 4), firstly, a cladding bump 2 is sequentially prepared one by one on the outer annular surface of the brake disc substrate 1 in sequence by adopting a synchronous laser cladding process;
and then cladding lugs 2 are sequentially prepared one by one on the outer surface of the other circular ring of the brake disc matrix 1 by adopting synchronous laser cladding treatment in sequence.
In the present application, the function and action of SiC: the SiC is added into the Fe base to form a carbide reinforced iron base, so that the hardness and the wear resistance of the cladding convex block 2 are greatly improved, and therefore, the mass percentage of the SiC is 3.0-4.0%, preferably 3.3-4.0%, and more preferably 3.6-4.0%.
Function and action of element C: the high temperature resistance of the cladding lug 2 is improved, so that the mass percentage of the element C is 4.0-4.5%, preferably 4.0-4.3%, and more preferably 4.0-4.15%.
Function and action of element B: the melting point is reduced, the expansion is reduced, and the strength and the hardness of the cladding convex block 2 are improved, so that the mass percentage of the element B is 1.5-2.5%, preferably 2.0-2.5%, and more preferably 2.3-2.5%.
Function and action of Si element: the high temperature resistance and the high toughness improve the impact toughness of the cladding convex block 2, so the mass percentage of the Si element is 2.0-3.0%, preferably 2.0-2.5%, and more preferably 2.0-2.2%.
Function and action of Cr element: the chromium has high corrosion resistance, and the corrosion resistance of the cladding convex block 2 is improved, so that the mass percentage of the Cr element is 24.0-30.0%, preferably 25.0-27.0%, and more preferably 26.0-26.5%.
Function and action of Ni element: the corrosion resistance of the cladding convex block 2 is improved, so that the mass percentage of the Ni element is 4.0-6.0%, preferably 4.5-5.5%, and more preferably 4.5-5.0%.
Function and action of element W: the hardness is high, the melting point is high, and the hardness of the cladding lug 2 is improved, so that the mass percent of W is 2.0-3.0%, preferably 2.3-3.0%, and more preferably 2.6-3.0%.
The function and function of TiC: the TiC has high melting point, boiling point and hardness, hardness is second to that of diamond, good thermal conductivity, high hardness, corrosion resistance and good thermal stability are achieved, and the thermal conductivity, high temperature resistance, hardness and corrosion resistance of the cladding bump 2 are improved, so that the TiC accounts for 5.0-6.0% by mass, preferably 5.3-6.0% by mass, and more preferably 5.6-6.0% by mass.
The scribing groove 3 functions as follows: chip removal; the preparation tool comprises the following steps: and (5) milling the machine.
The function of the thermal stress heat dissipation hole 4 is as follows: heat dissipation; the preparation tool comprises the following steps: drilling jig and boring machine.
The preparation tool of the fillet of the cladding convex block 2 is as follows: numerical control programming milling machine.
The scribing groove 3 is a shallow groove with a rectangular cross section, and the depth of the scribing groove is not more than 10% of the thickness of the brake disc substrate 1.
The thermal stress heat dissipation holes 4 are through holes and are located in the middle position between two adjacent scribing grooves 3, the hole diameter of each thermal stress heat dissipation hole 4 is 5mm, and the influence on the strength and the rigidity of the brake disc base body 1 is small.
In the step 2), ball milling is carried out for 5-6 h at the rotating speed of 240r/min, and the following steps are preferred: setting the ball milling rotation speed at 240r/min, ball milling time at each time of 25 minutes, retention time at each time of 5 minutes and cycle times of 10-12 times.
For further understanding of the present invention, the brake disc with cladding bumps on the surface and the method for manufacturing the same provided by the present invention are described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
A brake disc with cladding lugs on the surface comprises a brake disc base body 1 and a plurality of cladding lugs 2, wherein a part of the cladding lugs 2 are arranged on one circular outer surface of the brake disc base body 1, and the rest of the cladding lugs 2 are arranged on the other circular outer surface of the brake disc base body 1;
the brake disc base body 1 is made of cast iron;
the brake disc is characterized by further comprising a plurality of scribing grooves 3, wherein a part of scribing grooves 3 are formed in the outer annular surface of the brake disc base body 1, the rest of scribing grooves 3 are formed in the outer annular surface of the brake disc base body 1, and every two adjacent scribing grooves 3 in the outer annular surface of the brake disc base body 1 are uniformly distributed at an interval of 45 degrees;
the brake disc is characterized by further comprising a plurality of thermal stress heat dissipation holes 4, wherein the thermal stress heat dissipation holes 4 are uniformly formed in the circular outer surface of the brake disc base body 1, each thermal stress heat dissipation hole 4 is a through hole and is located in the middle position between every two adjacent scribing grooves 3, and the diameter of each thermal stress heat dissipation hole 4 is 5 mm;
in the cladding convex blocks 2 on the outer surface of each circular ring of the brake disc substrate 1, every three cladding convex blocks 2 form a group, each group of cladding convex blocks 2 is positioned between two adjacent scribing grooves 3, and each cladding convex block 2 is a rectangular block with the length of 10mm, the width of 10mm and the thickness of 3 mm;
two symmetrical side surfaces of the cladding convex block 2 are changed into arc surfaces through fillets, the radius of each fillet is 3mm, and the central symmetry planes of the two arc surfaces pass through the axial center line of the brake disc;
three cladding lugs 2 in each group of cladding lugs 2 are arranged in an isosceles triangle, and the thermal stress heat dissipation holes 4 are positioned at the middle points of the bottom edge lines of the isosceles triangle formed by the three cladding lugs 2;
the cladding lug 2 comprises the following components in percentage by mass: SiC: 3.0%, C: 4.0%, B: 1.5%, Si: 2.0%, Cr: 24.0%, Ni: 4.0%, W: 2.0%, TiC: 5.0%, Fe: and (4) the balance.
The preparation method of the brake disc with the cladding bump on the surface in the embodiment 1 includes the following steps:
1) weighing SiC powder, C powder, B powder, Si powder, Cr powder, Ni powder, W powder, TiC powder and Fe powder according to a formula, and then uniformly mixing for later use;
2) putting the uniformly mixed powder obtained in the step 1) into a ball milling tank, vacuumizing the ball milling tank, adding argon gas into the ball milling tank as protective gas, adding steel ball balls into the ball milling tank as grinding bodies, adding ethanol with the volume fraction of 95% into the ball milling tank as a grinding aid, performing ball milling for 6 hours at the rotating speed of 240r/min, and preparing slurry after ball milling is completed;
3) drying the slurry prepared in the step 2) in a drying box, and then screening by using a sieve with the aperture of 2.3 mu m, wherein the undersize is used as cladding powder;
4) blowing the cladding powder prepared in the step 3) onto the circular outer surface of the brake disc matrix 1 by a coaxial powder feeding mode and using argon as powder carrying gas to perform synchronous laser cladding treatment, controlling the laser power to be 1200W, the laser scanning speed to be 20mm/min, the powder feeding speed to be 3g/min, the laser spot diameter to be 3mm and the argon flow to be 6L/h, and preparing the brake disc with the cladding lug 2 on the surface after the completion;
in the step 4), firstly, preparing cladding lugs 2 on the outer surface of one of the circular rings of the brake disc matrix 1 one by one in sequence by adopting synchronous laser cladding treatment;
and then cladding lugs 2 are sequentially prepared one by one on the outer surface of the other circular ring of the brake disc matrix 1 by adopting synchronous laser cladding treatment in sequence.
According to the national standard GB5763-2008, the cladding bump 2 prepared in example 1 is subjected to a friction test on a constant speed friction machine, and the specific test results are shown in tables 1a and 1 b:
table 1a main performance index of the clad bump 2 prepared in example 1
Table 1b main performance index of the clad bump 2 prepared in example 1
| Hardness (HRL) | Impact toughness (J/cm)2) | |
| Example 1 | 60 | 3.72 |
Example 2
A brake disc with cladding lugs on the surface comprises a brake disc base body 1 and a plurality of cladding lugs 2, wherein a part of the cladding lugs 2 are arranged on one circular outer surface of the brake disc base body 1, and the rest of the cladding lugs 2 are arranged on the other circular outer surface of the brake disc base body 1;
the brake disc base body 1 is made of cast iron;
the brake disc is characterized by further comprising a plurality of scribing grooves 3, wherein a part of scribing grooves 3 are formed in the outer annular surface of the brake disc base body 1, the rest of scribing grooves 3 are formed in the outer annular surface of the brake disc base body 1, and every two adjacent scribing grooves 3 in the outer annular surface of the brake disc base body 1 are uniformly distributed at an interval of 45 degrees;
the brake disc is characterized by further comprising a plurality of thermal stress heat dissipation holes 4, wherein the thermal stress heat dissipation holes 4 are uniformly formed in the circular outer surface of the brake disc base body 1, each thermal stress heat dissipation hole 4 is a through hole and is located in the middle position between every two adjacent scribing grooves 3, and the diameter of each thermal stress heat dissipation hole 4 is 5 mm;
in the cladding convex blocks 2 on the outer surface of each circular ring of the brake disc substrate 1, every three cladding convex blocks 2 form a group, each group of cladding convex blocks 2 is positioned between two adjacent scribing grooves 3, and each cladding convex block 2 is a rectangular block with the length of 10mm, the width of 10mm and the thickness of 3 mm;
two symmetrical side surfaces of the cladding convex block 2 are changed into arc surfaces through fillets, the radius of each fillet is 3mm, and the central symmetry planes of the two arc surfaces pass through the axial center line of the brake disc;
three cladding lugs 2 in each group of cladding lugs 2 are arranged in an isosceles triangle, and the thermal stress heat dissipation holes 4 are positioned at the middle points of the bottom edge lines of the isosceles triangle formed by the three cladding lugs 2;
the cladding lug 2 comprises the following components in percentage by mass: SiC: 4.0%, C: 4.5%, B: 2.5%, Si: 3.0%, Cr: 30.0%, Ni: 6.0%, W: 3.0%, TiC: 6.0%, Fe: and (4) the balance.
The preparation method of the brake disc with the cladding bump on the surface in embodiment 2 includes the following steps:
1) weighing SiC powder, C powder, B powder, Si powder, Cr powder, Ni powder, W powder, TiC powder and Fe powder according to a formula, and then uniformly mixing for later use;
2) putting the uniformly mixed powder obtained in the step 1) into a ball milling tank, vacuumizing the ball milling tank, adding argon gas into the ball milling tank as protective gas, adding steel ball balls into the ball milling tank as grinding bodies, adding ethanol with the volume fraction of 95% into the ball milling tank as a grinding aid, performing ball milling for 6 hours at the rotating speed of 240r/min, and preparing slurry after ball milling is completed;
3) drying the slurry prepared in the step 2) in a drying box, and then screening by using a sieve with the aperture of 2.3 mu m, wherein the undersize is used as cladding powder;
4) blowing the cladding powder prepared in the step 3) onto the circular outer surface of the brake disc matrix 1 by a coaxial powder feeding mode and using argon as powder carrying gas to perform synchronous laser cladding treatment, controlling the laser power to be 1200W, the laser scanning speed to be 20mm/min, the powder feeding speed to be 3g/min, the laser spot diameter to be 3mm and the argon flow to be 6L/h, and preparing the brake disc with the cladding lug 2 on the surface after the completion;
in the step 4), firstly, preparing cladding lugs 2 on the outer surface of one of the circular rings of the brake disc matrix 1 one by one in sequence by adopting synchronous laser cladding treatment;
and then cladding lugs 2 are sequentially prepared one by one on the outer surface of the other circular ring of the brake disc matrix 1 by adopting synchronous laser cladding treatment in sequence.
According to the national standard GB5763-2008, the cladding bump 2 prepared in example 2 is subjected to a friction test on a constant speed friction machine, and the specific test results are shown in tables 2a and 2 b:
table 2a main performance index of the clad bump 2 prepared in example 2
Table 2b main performance index of the clad bump 2 prepared in example 2
| Hardness (HRL) | Impact toughness (J/cm)2) | |
| Example 2 | 65 | 3.84 |
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A preparation method of a brake disc with a cladding lug on the surface is characterized in that,
the brake disc with the cladding lug comprises a brake disc base body and a plurality of cladding lugs; a part of the cladding lugs are arranged on the circular outer surface of the brake disc base body, and the rest of the cladding lugs are arranged on the other circular outer surface of the brake disc base body;
the cladding lug consists of the following components in percentage by mass: SiC: 3.0% -4.0%, C: 4.0% -4.5%, B: 1.5% -2.5%, Si: 2.0-3.0%, Cr: 24.0% -30.0%, Ni: 4.0% -6.0%, W: 2.0% -3.0%, TiC: 5% -6%, Fe: the balance;
the preparation method specifically comprises the following steps:
1) weighing SiC powder, C powder, B powder, Si powder, Cr powder, Ni powder, W powder, TiC powder and Fe powder according to mass percent, and then uniformly mixing for later use;
2) putting the uniformly mixed powder obtained in the step 1) into a ball milling tank, vacuumizing the ball milling tank, adding argon gas into the ball milling tank as protective gas, adding steel ball balls into the ball milling tank as grinding bodies, adding ethanol with the volume fraction of 95% into the ball milling tank as a grinding aid, performing ball milling at the rotating speed of 240r/min for 5-6 h, and preparing slurry after ball milling;
3) drying the slurry prepared in the step 2) in a drying box, and then screening by using a sieve with the aperture of 2.3 mu m, wherein the undersize is used as cladding powder;
4) blowing the cladding powder prepared in the step 3) onto the annular outer surface of the brake disc base body by a coaxial powder feeding mode and using argon as powder carrying gas to perform synchronous laser cladding treatment, controlling the laser power to be 1200-1700W, controlling the laser scanning speed to be 20-40 mm/min, controlling the powder feeding speed to be 2-4 g/min, controlling the laser spot diameter to be 2-4 mm, and controlling the argon flow to be 5-8L/h, thus preparing the brake disc with the cladding lug on the surface.
2. The method for preparing a brake disc with cladding bumps on the surface, according to claim 1, wherein the brake disc further comprises a plurality of scribing grooves, a part of the scribing grooves are arranged on one circular outer surface of the brake disc base body, and the rest of the scribing grooves are arranged on the other circular outer surface of the brake disc base body;
two adjacent marking grooves on the outer surface of each circular ring of the brake disc base body are uniformly distributed at an interval of 45 degrees.
3. The method for preparing a brake disc with a cladding bump on the surface according to claim 2, wherein the brake disc further comprises a plurality of thermal stress heat dissipation holes, and the plurality of thermal stress heat dissipation holes are uniformly arranged on the circular outer surface of the brake disc base body;
each thermal stress heat dissipation hole is a through hole and is located at the middle position between two adjacent scribing grooves, and the aperture of each thermal stress heat dissipation hole is 5 mm.
4. The method for preparing a brake disc with cladding bumps on the surface thereof as claimed in claim 3, wherein every three cladding bumps on the outer circular surface of the brake disc base body form a group, each group of cladding bumps is located between two adjacent scribing grooves, and each cladding bump is a rectangular block with a length of 10mm, a width of 10mm and a thickness of 3 mm.
5. The method for preparing a brake disc with a cladding lug on the surface as claimed in claim 4, wherein two mutually symmetrical side surfaces of the cladding lug are changed into arc surfaces through a fillet, the radius of the fillet is 3mm, and the central symmetrical surface of the two arc surfaces passes through the axial center line of the brake disc.
6. The method of claim 4, wherein the three cladding protrusions of each group of cladding protrusions are arranged in an isosceles triangle, and the thermal stress heat dissipation hole is located at a midpoint of a bottom line of the isosceles triangle surrounded by the three cladding protrusions.
7. The method for preparing a brake disc with a cladding lug on the surface according to claim 1, wherein in the step 4), the cladding lug is prepared on one circular outer surface of the brake disc substrate sequentially one by adopting a synchronous laser cladding treatment;
and then sequentially preparing cladding lugs one by one on the outer surface of the other circular ring of the brake disc substrate by adopting synchronous laser cladding treatment.
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| CN113513552A (en) * | 2021-05-20 | 2021-10-19 | 上海淳信机电科技有限公司 | High-wear-resistance car brake disc coated with composite material and preparation process |
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| CN111271396A (en) | 2020-06-12 |
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