CN105673739A - High-heat-capacity SiCp/Al composite material wheel-mounted brake disc bodies - Google Patents

Abstract

The invention relates to a high heat capacity SiCp/Al composite material wheel-mounted brake disc body, the material of which is SiC/Al composite material, comprising: a friction ring (1), a high rib (2), and a connecting column (3) , short plate reinforcement (4), positioning column (5), bolt hole (6), positioning groove (7). The section of the friction ring (1) is trapezoidal; a group of 3 high ribs (2), a total of 6 groups are evenly distributed in the circumferential direction; the combined rib A is composed of 1 high rib (2) and 1 connecting column (3), 12 Combination bars A are evenly distributed in the circumferential direction; combination bars B are composed of 2 high plate bars (2), 1 short plate bars (4) and 1 positioning column (5), and 6 combination bars B are evenly distributed in the circumferential direction; connecting columns (3) Bolt holes (6) are provided, and positioning posts (5) are provided with positioning slots (7). The two discs are respectively located on both sides of the wheel, and the bolts are used to realize the axial positioning with the wheel, and the positioning pins are used to realize the circumferential positioning with the wheel. The disc has coordinated deformation, uniform internal temperature and small stress.

Description

A high heat capacity SiCp/Al composite wheel-mounted brake disc body

technical field

The invention relates to the field of urban rail transit, in particular to a high heat capacity SiCp/Al composite material wheel-mounted brake disc body . The disc body is cast and is suitable for urban rail trains and fast freight cars with a speed below 140km/h.

Background technique

Brake discs, as the basic brake components of rail transit trains, play a vital role in ensuring the safe operation of trains. As "energy saving and environmental protection" has attracted more and more attention from countries all over the world, lightweight technology has also been widely used in various industries related to the national economy and people's livelihood. The lightweight of rail trains is of great significance in reducing energy consumption, saving traction kinetic energy, and reducing train operating costs. In particular, reducing the weight of components such as brake discs and brake pads can significantly reduce the unsprung weight of the bogie and improve the performance of the train. dynamic performance.

Compared with traditional steel brake discs, aluminum matrix composite brake discs have a series of advantages such as low density, high specific strength and specific stiffness, small thermal expansion coefficient, good thermal conductivity and excellent wear resistance; and C/C fiber Composite brake discs and ceramic matrix composites (CMC) have the advantages of relatively simple preparation process and low preparation cost, making them the preferred brake disc material for the new generation of rail transit train basic braking devices. The aluminum-based composite material brake disc is used to replace the traditional steel material brake disc, which can reduce the weight of the brake disc by 30-50%.

When the steel brake disc brakes, it is accompanied by obvious brake whistle, and at the same time, the huge brake heat load causes a high and uneven temperature rise on the friction surface of the brake disc, which induces hot spots and affects the brake disc. service life. The excellent heat dissipation and thermal conductivity of the aluminum matrix composite material can eliminate the hot spot on the friction surface, thereby prolonging the service life, and at the same time greatly reducing the braking noise without whistling.

The service reliability of the brake disc depends on the material, structure, molding quality and service conditions of the brake disc. Compared with steel materials, aluminum matrix composite materials have lower strength, especially at high temperature. Therefore, the key to the structural design of aluminum matrix composite brake discs is to reduce the temperature rise of the brake disc and reduce the thermal stress of the brake. In addition, aluminum-based composite materials are difficult to form, and casting defects such as pores, thermal cracks, and shrinkage porosity are easily generated inside the casting.

Therefore, the use of aluminum-based composite material brake discs to replace traditional steel brake discs can not only meet the requirements of light weight, but also achieve the purpose of improving durability, and has great application prospects in the field of low-speed train brake discs.

Contents of the invention

The tensile strength of SiCp/Al composite material is low, especially its strength decreases rapidly with the increase of temperature. SiCp/Al composite material is used for brake disc, and its heat capacity problem must be solved by reasonable brake disc structure design. The patent of the present invention provides a high heat capacity SiCp/Al composite material wheel-mounted brake disc body (hereinafter referred to as the disc body), which has uniform temperature field distribution, high heat capacity, free axial warping, radial free Stretch and other features.

The technical solution adopted by the patent of the present invention to solve its technical problems is: a high heat capacity SiCp/Al composite material wheel-mounted brake disc body, the structure of which consists of a friction ring (1), a high rib (2), a connecting column (3), low plate reinforcement (4), positioning column (5), bolt hole (6), positioning groove (7) form. The disk body material is a particle-reinforced aluminum-based composite material with a SiC particle content of 10wt%-20wt%. The friction ring (1) of the disc body adopts large thickness and trapezoidal cross-section, the material distribution is more reasonable, the distribution uniformity of the temperature field in the disc body is improved, and the heat capacity is higher; the disc body adopts radially distributed high ribs (2) and The short ribs (4) make the disc body have good ventilation effect and structural rigidity, while the radial section of the high ribs (2) is "convex" shape, which reduces the constraint on the axial deformation of the disc body.

Compared with the prior art, the present invention has the following advantages:

The disc body involved in the present invention is made of SiCp/Al composite material, which is lighter in weight and has no braking noise compared with traditional steel brake discs;

The disk body involved in the present invention adopts anti-gravity filling under pressure, and the molding quality of the disk body is better;

The friction ring of the disk body involved in the present invention adopts large thickness and trapezoidal cross-section, which has the characteristics of more reasonable material distribution and more uniform temperature field distribution in the disk body than friction rings with equal thickness;

The disc body involved in the present invention adopts radially distributed high and low ribs, and at the same time, the radial section of the high ribs is "convex" shape, so that the disc body has good ventilation effect and structural rigidity, and reduces the impact on the disc body. Axial deformation constraints.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only an embodiment of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a structural diagram of a high heat capacity SiCp/Al composite material wheel-mounted brake disc body provided by an embodiment of the present invention. In the figure , a friction ring 1, a high rib 2, a connecting column 3, and a low rib 4 , positioning column 5, bolt hole 6, positioning groove 7.

Figure 2 is a sectional view through the axis of the wheel-mounted brake disc body.

Fig. 3 is a structural schematic diagram of the wheel-mounted brake disc body.

FIG. 4 is a CC sectional view in FIG . 3 .

FIG. 5 is a sectional view of DD in FIG . 3 .

Figure 6 shows the assembled wheel-mounted brake disc.

detailed description

Below in conjunction with accompanying drawing , the patent of the present invention is further described.

A high heat capacity SiCp/A356 composite wheel-mounted brake disc, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , and Figure 6 .

The total height of the disc body is 51.5 mm, the outer diameter of the friction ring 1 is Ф640 mm, and the inner diameter is Ф350 mm. The thickness of the inner and outer diameters of the disc body friction ring 1 is smaller at 27 mm, and the thickness at the middle diameter is larger at 33 mm. As shown in Figure 2 .

The high ribs 2 are radially arranged, and 3 high ribs 2 form a group, a total of 6 groups are evenly distributed along the circumferential direction, and the angle between two adjacent high ribs 2 is 6°, as shown in Figure 2 . The top thickness of the high rib 2 is 8mm, the root length of the high rib 2 is 125mm, and the end and side slopes of the high rib 2 are 5°, as shown in Fig. 4 and Fig. 5 .

The top surface of the high bar 2 is composed of a horizontal plane and two slopes, wherein the length of the horizontal plane is 42 mm, and the angle between the slope and the horizontal plane is 8°, as shown in Figure 5 .

The composite reinforcement A is composed of a high plate reinforcement 2 and a connecting column 3, and 12 composite reinforcements A are uniformly distributed along the circumference; the top surface of the connecting column 3 is composed of R11.5-R226-R11.5-L20.4-R10. 5-R224-R10.5-L20.4, the side slopes are 5° respectively; the connecting column 3 is provided with stepped bolt holes 6 along the central axis, as shown in Figure 5 .

The combined reinforcement B is composed of two high plate reinforcements 2 and a positioning column 5, and the 6 composite reinforcements B are evenly distributed along the circumference; the top surface of the positioning column 5 is surrounded by R226-L42-R224-L42, and the slopes of the sides are respectively is 5°; the positioning column 5 is provided with a positioning groove 7 along the line of symmetry, as shown in Figure 2 .

The two discs are respectively located on both sides of the wheel, and are connected by 12 M14 high-strength bolts to realize the axial positioning of the wheel and the disc, and the circumferential positioning of the disc and the wheel is realized by 6 positioning pins. As shown in Figure 6 .

Note: All the length units of "Φ*", "R*" and "L*" in the file are "mm"

The material used for the disc body is application number 200510011526.0, and the name of the invention: "a vacuum mechanical double-stirred casting method for preparing particle-reinforced aluminum matrix composite material" is a 15wt% SiC particle-reinforced aluminum matrix composite material; the disc body is formed by vacuum air conditioning , the method and equipment for vacuum air pressure molding are application number 200410009617.6, and the name of the invention is "a pressure regulating casting method and a crucible for pressure regulating".

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (6)

1. brake disk mounted disk body taken turns by a high heat capacity SiCp/Al composite, it is characterized in that, specifically include that drag ring (1), high plate muscle (2), joint pin (3), short plate muscle (4), locating dowel (5), bolt hole (6), locating slot (7).

2. brake disk mounted disk body taken turns by a kind of high heat capacity SiCp/Al composite according to claim 1, it is characterised in that described disk body material is the particle enhanced aluminum-based composite material of SiC particulate content 10wt%-20wt%.

3. brake disk mounted disk body taken turns by a kind of high heat capacity SiCp/Al composite according to claim 1, it is characterised in that the cross section of described drag ring (1) is trapezoidal, improves the distributing homogeneity in temperature field in disk body.

4. brake disk mounted disk body taken turns by a kind of high heat capacity SiCp/Al composite according to claim 1, it is characterised in that described disk body adopts antigravity casting molding under vacuo.

5. brake disk mounted disk body taken turns by a kind of high heat capacity SiCp/Al composite according to claim 1, it is characterized in that, described disk body adopts radially-arranged high plate muscle (2) and short plate muscle (4), makes disk body have good ventilation effect and the rigidity of structure.

6. brake disk mounted disk body taken turns by a kind of high heat capacity SiCp/Al composite according to claim 1, it is characterised in that the radial section of described high plate muscle (2) is " convex " font, decreases the constraint to disk body axial deformation.