Bimetallic composite brake drum and manufacturing method thereof

Abstract

The present invention discloses a bimetallic composite brake drum and a manufacturing method thereof, wherein the bimetallic composite brake drum comprises an inseparable outer shell and a cast iron lining, a first wavy structure is formed on the outer shell, and a second wavy structure matching the first wavy structure is formed on the outer wall of the cast iron lining; a plurality of circumferentially spaced and axially extending convex ribs are formed on the inner wall of the outer shell, and a plurality of grooves matching the convex ribs are also formed on the outer wall of the cast iron lining. The manufacturing method is to respectively use a sand casting method, a rolling forming method and a die casting method to realize the manufacturing of the above-mentioned bimetallic composite brake drum. The bimetallic composite brake drum of the present invention is a bimetallic composite brake drum that is strong and durable, has high safety, and can effectively reduce the generation and extension of tortoise cracks.

Description

Technical Field

[0001] The invention belongs to the field of brake drum manufacturing, and in particular relates to a bimetallic composite brake drum and a manufacturing method thereof. Background Art

[0002] At present, most of the failures of the three guarantees of bimetallic composite brake drums are cracking, followed by splitting and bottoming. In addition, the shell strength of the current bimetallic composite brake drum is weak, the deformation resistance is poor, and there is no circumferential limiting structure between the shell and the lining, so the lining is prone to circumferential movement, and the safety is poor.

[0003] In view of this, there is an urgent need to improve the existing technology and develop and manufacture a bimetallic composite brake drum that is durable, safe, and can effectively reduce the generation and extension of cracks. Summary of the invention

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the first technical problem solved by the present invention is to provide a bimetallic composite brake drum which is strong and durable, highly safe and can effectively reduce the generation and extension of cracks.

[0005] As the same technical concept, the second technical problem solved by the present invention is to provide a method for manufacturing a bimetallic composite brake drum.

[0006] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a bimetallic composite brake drum, comprising an outer shell and a cast iron lining that are inseparable and connected, the outer shell is formed with a first wavy structure, and the outer wall surface of the cast iron lining is formed with a second wavy structure that is compatible with the first wavy structure; a plurality of circumferentially spaced and axially extending ribs are formed on the inner wall surface of the outer shell, and a plurality of grooves that are compatible with the ribs are also formed on the outer wall surface of the cast iron lining.

[0007] Furthermore, the cross-section of the convex rib is in an arc-shaped structure, a square structure or a diamond-shaped structure, and a transition arc is provided at the connection between the convex rib and the shell.

[0008] Furthermore, the plurality of convex ribs are arranged at equal intervals in the circumferential direction.

[0009] Furthermore, the housing is formed with a plurality of annular protrusions and annular depressions which are staggered along the axial direction, and the annular protrusions and the annular depressions cooperate to form the first wave-shaped structure;

[0010] The first wavy structure includes an outer wavy wall surface and an inner wavy wall surface corresponding to the outer wavy wall surface, and the second wavy structure is adapted to the inner wavy wall surface.

[0011] Furthermore, the shell is made of steel.

[0012] Furthermore, the shell is made of aluminum alloy.

[0013] The first technical solution adopted by the present invention to solve the above second technical problem is: a method for manufacturing a bimetallic composite brake drum, which is used to manufacture the bimetallic composite brake drum whose shell is made of steel material, and the bimetallic composite brake drum manufacturing method comprises:

[0014] S1. Manufacturing a first sand core for forming the inner wall surface of the outer shell, and a second sand core and a third sand core for forming the outer wall surface of the outer shell; the first sand core comprises a sand core body and core heads respectively connected to both ends of the sand core body, the sand core body is provided with a groove structure for forming the convex rib, and the inner walls of the second sand core, the third sand core and the outer wall of the sand core body are respectively provided with wave forming structures for cooperating with each other to form the first wave-shaped structure;

[0015] S2, assembling the first sand core, the second sand core and the third sand core into one, then placing them in a sand box, and pressing a gland;

[0016] S3, pouring molten steel, the molten steel flows into the gaps between the first sand core, the second sand core, and the third sand core to form a shell blank;

[0017] S4, then placing the shell blank in a horizontal centrifugal casting machine, and centrifugally casting the molten iron at a certain temperature, and after cooling, a bimetallic composite brake drum blank made of composite steel and cast iron is formed;

[0018] S5. Machining the bimetallic composite brake drum blank to form the bimetallic composite brake drum.

[0019] The second technical solution adopted by the present invention to solve the above second technical problem is: a method for manufacturing a bimetallic composite brake drum, which is used to manufacture the bimetallic composite brake drum whose shell is made of steel material, and the bimetallic composite brake drum manufacturing method comprises:

[0020] S1, punching a raw material steel plate into a first round cake, and punching the first round cake into a second round cake with a central positioning hole;

[0021] S2, placing the second round cake on the top of the spinning mold, and using the top cover to press and position it, the part of the second round cake that is pressed and positioned is used to form a mounting plane; using the spinning wheel of the spinning equipment to spin the part of the second round cake that is not pressed and positioned, and forming the first steel shell with the convex rib based on the groove structure on the spinning mold;

[0022] S3, using a roll forming device to roll form the first steel shell and perform a closing process to form a second steel shell with the first wavy structure;

[0023] S4, then placing the second steel shell in a horizontal centrifugal casting machine, and casting molten iron at a certain temperature, and after cooling, a bimetallic composite brake drum blank made of composite steel and cast iron is formed;

[0024] S5. Machining the bimetallic composite brake drum blank to form the bimetallic composite brake drum.

[0025] The third technical solution adopted by the present invention to solve the above second technical problem is: a method for manufacturing a bimetallic composite brake drum, which is used to manufacture the bimetallic composite brake drum whose shell is made of steel material, and the method for manufacturing the bimetallic composite brake drum comprises:

[0026] S1. Hot pressing a raw material steel pipe or a round pipe formed by welding a raw material rectangular steel plate to form a first round pipe, wherein the first round pipe includes a straight pipe portion and a tapered pipe portion;

[0027] S2. hot pressing the first round tube to form a second round tube, wherein the second round tube includes a straight tube portion and a planar mounting portion with a central positioning hole;

[0028] S3, placing the second round tube on the top of the spinning mold h, and using the top cover to press and position the flat mounting portion; using the spinning wheel of the spinning equipment to spin the portion of the second round tube that is not pressed and positioned, and forming the first steel shell with the convex ribs based on the groove structure on the spinning mold h;

[0029] S3, using a roll forming device to roll form the first steel shell and perform a closing process to form a second steel shell with the first wavy structure;

[0030] S4, then placing the second steel shell in a horizontal centrifugal casting machine, and centrifugally casting the molten iron at a certain temperature, to form a bimetallic composite brake drum blank made of composite steel and cast iron after cooling;

[0031] S5. Machining the bimetallic composite brake drum blank to form the bimetallic composite brake drum.

[0032] The fourth technical solution adopted by the present invention to solve the above second technical problem is a method for manufacturing a bimetallic composite brake drum, which is used to manufacture the bimetallic composite brake drum whose shell is made of aluminum alloy. The method for manufacturing the bimetallic composite brake drum comprises:

[0033] S1, using a mold and molding sand to make a sand mold in a sand box, placing a pre-made sand core for forming the outer wall surface of the cast iron lining into the sand mold, and pouring molten iron after closing the box; the molten iron flows into the gap between the sand core and the molding sand to form a cast iron lining blank; wherein the inner wall of the sand core is provided with a wave forming structure for forming the second wave-shaped structure and a protruding structure for forming the groove;

[0034] S2, machining the outer wall surface and the inner wall surface of the cast iron lining blank to form the cast iron lining;

[0035] S3, placing the cast iron lining on the mounting seat, casting aluminum alloy water by die casting, forming a bimetallic composite brake drum blank composed of two metal materials of composite aluminum alloy and cast iron after cooling, and performing T6 heat treatment on the bimetallic composite brake drum blank.

[0036] S4. Machining the bimetallic composite brake drum blank after the T6 heat treatment to form the bimetallic composite brake drum.

[0037] Due to the adoption of the above technical solution, the beneficial effects achieved are as follows:

[0038] The bimetallic composite brake drum and its manufacturing method of the present invention, wherein the bimetallic composite brake drum comprises an inseparable outer shell and a cast iron lining, a first wavy structure is formed on the outer shell, and a second wavy structure matching the first wavy structure is formed on the outer wall of the cast iron lining; a plurality of convex ribs arranged circumferentially and extending axially are formed on the inner wall of the outer shell, and a plurality of grooves matching the convex ribs are also formed on the outer wall of the cast iron lining. The plurality of grooves divide the outer wall of the cast iron lining into a plurality of parts, increasing the surface area for heat dissipation, and also play a blocking role in the growth of tortoise cracks on the brake surface of the brake drum, reducing the generation and extension of tortoise cracks on the brake surface of the brake drum; the convex ribs and the first wavy structure form a network structure, which can increase the strength of the outer shell and improve the anti-deformation ability; and the convex ribs and the grooves cooperate to form a circumferential limit structure for preventing the circumferential movement of the cast iron lining, ensuring the firmness of the combination of the outer shell and the cast iron lining, thereby improving safety. The manufacturing method of the bimetallic composite brake drum is used to manufacture the above-mentioned bimetallic composite brake drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the bimetallic composite brake drum of the present invention;

[0040] Figure 2 yes Figure 1 Schematic diagram of the structural decomposition of;

[0041] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at center A;

[0042] Figure 4 yes Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0043] Figure 5 yes Figure 1 A cross-sectional view of

[0044] Figure 6 It is a schematic diagram of the steps of the first embodiment of the method for manufacturing a bimetallic composite brake drum of the present invention;

[0045] Figure 7 It is a schematic diagram of the steps of a second embodiment of the method for manufacturing a bimetallic composite brake drum of the present invention;

[0046] Figure 8 yes Figure 7 Schematic diagram of the structure of the spinning die;

[0047] Fig. 9 yes Figure 7 A cross-sectional view of the first steel shell;

[0048] Fig.10 It is a schematic diagram of some steps of a third embodiment of the method for manufacturing a bimetallic composite brake drum of the present invention;

[0049] Fig.11 Schematic diagram of the steps of the fourth embodiment of the method for manufacturing a bimetallic composite brake drum according to the present invention;

[0050] In the figure, 1-housing, 11-body, 111-first wavy structure, 112-convex rib, 12-flange mounting end, 121-center positioning hole, 122-mounting hole, 13-closing portion, 2-cast iron lining, 21-second wavy structure, 22-groove, 23-braking surface, 3-first sand core, 31-sand core body, 32-core head, 4-second sand core, 5-third sand core, 6-sprue, 7-iron ladle, 8-rotating wheel, 91-sand core, 92-molding sand, 93-mounting seat, 94-external die, 95-inner die, 96-cavity;

[0051] a-first round cake, b-second round cake, c-steel pipe, d-round pipe, e-first round pipe, e1-straight pipe portion, e2-tapered pipe portion, f-second round pipe, f1-straight pipe portion, f2-flat mounting portion, g-center positioning hole, h-spinning mold, h1-groove structure, k-first steel shell, m-second steel shell, o-inner wavy wall, p-outer wavy wall, x-shell blank, y1-bimetallic composite brake drum blank, y2-bimetallic composite brake drum blank, y3-bimetallic composite brake drum blank. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] Embodiment 1:

[0054] This embodiment discloses a bimetallic composite brake drum.

[0055] Depend on Figures 1 to 5 As shown together, the bimetallic composite brake drum includes an inseparable outer shell 1 and a cast iron lining 2 (made of vermicular cast iron or gray iron), the outer shell includes a main body 11 (cylindrical structure) and a flange mounting end 12 arranged at one end of the main body 11 and a closing portion 13 arranged at the other end, and the flange mounting end 12 is provided with a center positioning hole 121 and a plurality of mounting holes 122 distributed in a circumferential array with the center of the center positioning hole 121 as the center. A first wavy structure 111 (formed by sand casting, rolling forming or die casting) is formed on the main body 11 of the shell 1, and a second wavy structure 21 matched with the first wavy structure 111 is formed on the outer wall surface of the cast iron lining 2, and the inner wall surface of the cast iron lining 2 is a braking surface 23 (plane); specifically: the first wavy structure 111 is formed by a plurality of annular protrusions and annular recesses arranged axially staggered, which cooperate with each other; the first wavy structure 111 includes an outer wavy wall surface p and an inner wavy wall surface o corresponding to the outer wavy wall surface p, that is, the concave limit of the outer wavy wall surface p corresponds to the convex part of the inner wavy wall surface o; the second wavy structure 21 is matched with the inner wavy wall surface o.

[0056] In addition, a plurality of ribs 112 arranged circumferentially and extending axially are formed on the inner wall surface of the body 11 of the shell 1. The cross section of the rib 112 is arc-shaped, with a height of 3mm and a width of 6mm. A transition arc is provided at the connection between the rib 112 and the shell 1. A plurality of grooves 22 matching the ribs 112 are also formed on the outer wall surface of the cast iron lining 2. In addition, the single-side thickness of the thinnest point of the cast iron lining 2 (the end adjacent to the mounting flange mounting end 12 of the shell 11) is 4-5mm, and the single-side value of the designed wear limit is 3mm, which can fully meet the service life of normal wear.

[0057] In this embodiment, there are 10 convex ribs 112 arranged at equal intervals in the circumferential direction. The housing 1 can be made of steel or aluminum alloy. It should be noted that the cross section of the convex rib 112 can be square, diamond or other shapes, and the number can also be multiple other than 10.

[0058] Embodiment 2:

[0059] This embodiment discloses a method for manufacturing a bimetallic composite brake drum, wherein the outer shell 1 is made of steel.

[0060] Depend on Figure 6 (1)~ Figure 6 (4), the manufacturing method of the bimetallic composite brake drum of this embodiment includes:

[0061] S1. Prepare a first sand core 3 for forming the inner wall surface of the outer shell 1 (including the inner wavy wall surface o), a second sand core 4 and a third sand core 5 for forming the outer wall surface of the outer shell 1 (including the outer wavy wall surface p); the first sand core 3 includes a sand core body 31 and a core head 32 respectively connected to the two ends of the sand core body 31, and the sand core body 31 is provided with a groove structure for forming a convex rib 112 (it is necessary to ensure that the connection between the convex rib 112 and the outer shell 1 has an arc transition to facilitate demolding), and the inner walls of the second sand core 4 and the third sand core 5 and the outer wall of the sand core body 31 are respectively provided with wave forming structures for cooperating with each other to form the first wavy structure 111.

[0062] S2, assembling the first sand core 3, the second sand core 4 and the third sand core 5 into one, then placing them in a sand box, and pressing a cover plate.

[0063] S3. Pour molten steel (through the runner 6), and the molten steel flows into the gaps between the first sand core 3 and the second sand core 4 and the third sand core 5 to form a shell blank x.

[0064] S4. The shell blank x is then placed in a horizontal centrifugal casting machine (the shell blank x rotates) and molten iron is centrifugally cast at a certain temperature (the robot grabs the ladle 7 and pours molten iron at 1500°C to 1700°C onto the inner wall of the shell blank x), thereby forming a bimetallic composite brake drum blank y1 made of composite steel and cast iron.

[0065] S5. Machining the bimetallic composite brake drum blank y1 (end face machining, center positioning hole g expansion processing to obtain center positioning hole 121, mounting hole 122 machining, brake surface 23 machining) to form the bimetallic composite brake drum disclosed in the first embodiment.

[0066] Embodiment three:

[0067] This embodiment discloses a method for manufacturing a bimetallic composite brake drum, the principle of which is different from that of the second embodiment, and is used to manufacture a bimetallic composite brake drum whose outer shell 1 is made of steel.

[0068] Depend on Figure 7 (1)~ Figure 7 (6) Figure 8 and Fig. 9 As shown together, the bimetallic composite brake drum manufacturing method of this embodiment includes:

[0069] S1. Punch the raw material steel plate into a first round cake a, and punch the first round cake a to form a second round cake b with a central positioning hole g.

[0070] S2. Place the second round cake b on the top of the spinning mold h and use the top cover to press and position it. The part of the second round cake b that is pressed and positioned is used to form a mounting plane (corresponding to the flange mounting end 12); Use the spinning wheel 8 of the spinning equipment to spin the part of the second round cake b that is not pressed and positioned, and form a first steel shell k with convex ribs 112 based on the groove structure h1 on the spinning mold h.

[0071] S3. Use a rolling forming device to roll-form the first steel shell k and perform a closing treatment to form a second steel shell m with a first wavy structure 111; (the rolling forming device includes at least two pairs of rollers, one pair is used for rolling to form the first wavy structure 111, and the other pair is used for rolling to form the closing portion 13).

[0072] S4. Then, the second steel shell m is placed in a horizontal centrifugal casting machine (the second steel shell m rotates), and molten iron is centrifugally cast at a certain temperature (the robot grabs the ladle 7 and pours molten iron at 1500° C. to 1700° C. onto the inner wall of the second steel shell m). After cooling, a bimetallic composite brake drum blank y2 made of composite steel and cast iron is formed.

[0073] S5. Machining the bimetallic composite brake drum blank y2 (end face machining, center positioning hole g expansion processing to obtain center positioning hole 121, mounting hole 122 machining, brake surface 23 machining) to form the bimetallic composite brake drum disclosed in the first embodiment.

[0074] Embodiment 4:

[0075] This embodiment also discloses a method for manufacturing a bimetallic composite brake drum whose outer shell 1 is made of steel. The principle is similar to that of the third embodiment, but the manufacturing steps are slightly different due to different raw material selection.

[0076] Depend on Fig.10 (1)~ Fig.10 (3) and Figure 7 (3)~ Figure 7 (6) As shown in the figure, the manufacturing method of the bimetallic composite brake drum of this embodiment includes:

[0077] S1. Hot pressing a raw material steel pipe c or a round pipe d formed by welding raw material rectangular steel plates to form a first round pipe e, wherein the first round pipe e includes a straight pipe portion e1 and a tapered pipe portion e2.

[0078] S2, hot pressing the first round tube e to form a second round tube f, wherein the second round tube f comprises a straight tube portion f1 and a flat mounting portion f2 with a central positioning hole g. The following steps are the same as those in the third embodiment.

[0079] S3, placing the second round tube f on the top of the spinning mold h, and using the top cover to press and position the flat mounting portion g2; using the spinning wheel 8 of the spinning equipment to spin the portion of the second round tube f that is not pressed and positioned, and forming a first steel shell k with convex ribs 112 based on the groove structure h1 on the spinning mold h.

[0080] S3, using a rolling forming device to roll-form the first steel shell k and perform a closing process to form a second steel shell m with a first wavy structure 111.

[0081] S4. Then, the second steel shell m is placed in a horizontal centrifugal casting machine, and molten iron is centrifugally cast at a certain temperature. After cooling, a bimetallic composite brake drum blank y2 made of composite steel and cast iron is formed.

[0082] S5. Machining the bimetallic composite brake drum blank y2 to form the bimetallic composite brake drum disclosed in the first embodiment.

[0083] Embodiment five:

[0084] This embodiment discloses a method for manufacturing a bimetallic composite brake drum whose shell 1 is made of aluminum alloy. Due to the low melting point of aluminum alloy, the above three manufacturing methods are not suitable for the manufacture of a bimetallic composite brake drum made of two metal materials: aluminum alloy and cast iron.

[0085] Depend on Fig.11 (1)~ Fig.11 (5) As shown in FIG. 5 , the manufacturing method of the bimetallic composite brake drum of this embodiment includes:

[0086] S1. A sand mold is made in a sand box using a mold and molding sand 92, and a pre-made sand core 91 for forming the outer wall surface of the cast iron lining 2 is placed in the sand mold. After the box is closed, molten iron is poured; the molten iron flows into the gap between the sand core 91 and the molding sand 92 to form a cast iron lining blank; wherein the inner wall of the sand core 91 is provided with a wave forming structure for forming the second wave-shaped structure 21 and a protruding structure for forming the groove 22.

[0087] S2. The outer wall surface and the inner wall surface of the cast iron lining blank are machined to form a cast iron lining 2; wherein the outer wall surface is machined to facilitate bonding with the aluminum alloy.

[0088] S3. Place the cast iron lining 2 on the mounting seat 93, and use the die-casting method to pour aluminum alloy water (during the solidification of the aluminum alloy water in the cavity 96, the outer die 94 and the inner die 95 are moved toward the static mounting seat 93 to pressurize the aluminum alloy water). After cooling, a bimetallic composite brake drum blank y3 made of composite aluminum alloy and cast iron is formed, and the bimetallic composite brake drum blank y3 is subjected to T6 heat treatment.

[0089] S4. The bimetallic composite brake drum blank y3 after T6 heat treatment is machined (end surface machining, center positioning hole 121 machining, mounting hole 122 machining) to form the bimetallic composite brake drum disclosed in the first embodiment.

[0090] The bimetallic composite brake drum manufactured by the above-mentioned manufacturing method, wherein a plurality of grooves 22 divide the outer wall surface of the cast iron lining 2 into a plurality of parts, increases the surface area for heat dissipation, and can also play a blocking role on the growth of tortoise cracks on the braking surface 23 of the brake drum, thereby reducing the generation and extension of tortoise cracks on the braking surface 23 of the brake drum; the ribs 112 and the first wavy structure 111 form a network structure, which can increase the strength of the outer shell 1 and improve the deformation resistance; and the ribs 112 and the grooves 22 cooperate to form a circumferential limiting structure for preventing the circumferential movement of the cast iron lining 2, thereby ensuring the firmness of the combination of the outer shell 1 and the cast iron lining 2, thereby improving safety.

[0091] In summary, the bimetallic composite brake drum of the present invention is a bimetallic composite brake drum which is strong and durable, highly safe and can effectively reduce the generation and extension of cracks.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a bimetallic composite brake drum, the bimetallic composite brake drum comprising an inseparable outer shell and a cast iron lining, the outer shell being formed with a first wavy structure, the outer wall surface of the cast iron lining being formed with a second wavy structure matching the first wavy structure; the inner wall surface of the outer shell being formed with a plurality of circumferentially spaced and axially extending ribs, the outer wall surface of the cast iron lining being formed with a plurality of grooves matching the ribs, the outer shell being made of steel, characterized in that: The bimetallic composite brake drum manufacturing method comprises: S1. Manufacturing a first sand core for forming the inner wall surface of the outer shell, and a second sand core and a third sand core for forming the outer wall surface of the outer shell; the first sand core comprises a sand core body and core heads respectively connected to both ends of the sand core body, the sand core body is provided with a groove structure for forming the convex rib, and the inner walls of the second sand core, the third sand core and the outer wall of the sand core body are respectively provided with wave forming structures for cooperating with each other to form the first wave-shaped structure; S2, assembling the first sand core, the second sand core and the third sand core into one, then placing them in a sand box, and pressing a gland; S3, pouring molten steel, the molten steel flows into the gaps between the first sand core, the second sand core, and the third sand core to form a shell blank; S4, then placing the shell blank in a horizontal centrifugal casting machine, and centrifugally casting the molten iron at a certain temperature, and after cooling, a bimetallic composite brake drum blank made of composite steel and cast iron is formed; S5. Machining the bimetallic composite brake drum blank to form the bimetallic composite brake drum.

2. A method for manufacturing a bimetallic composite brake drum, the bimetallic composite brake drum comprising an inseparable outer shell and a cast iron lining, the outer shell being formed with a first wavy structure, the outer wall surface of the cast iron lining being formed with a second wavy structure matching the first wavy structure; the inner wall surface of the outer shell being formed with a plurality of circumferentially spaced and axially extending ribs, the outer wall surface of the cast iron lining being formed with a plurality of grooves matching the ribs, the outer shell being made of aluminum alloy, characterized in that: The bimetallic composite brake drum manufacturing method comprises: S1, using a mold and molding sand to make a sand mold in a sand box, placing a pre-made sand core for forming the outer wall surface of the cast iron lining into the sand mold, and pouring molten iron after closing the box; the molten iron flows into the gap between the sand core and the molding sand to form a cast iron lining blank; wherein the inner wall of the sand core is provided with a wave forming structure for forming the second wave-shaped structure and a protruding structure for forming the groove; S2, machining the outer wall surface and the inner wall surface of the cast iron lining blank to form the cast iron lining; S3, placing the cast iron lining on the mounting seat, casting aluminum alloy water by die casting, forming a bimetallic composite brake drum blank composed of two metal materials of composite aluminum alloy and cast iron after cooling, and performing T6 heat treatment on the bimetallic composite brake drum blank; S4. Machining the bimetallic composite brake drum blank after the T6 heat treatment to form the bimetallic composite brake drum.

3. The method for manufacturing a bimetallic composite brake drum according to claim 1 or 2, characterized in that: The cross section of the convex rib is in an arc-shaped structure, a square structure or a diamond-shaped structure, and a transition arc is arranged at the connection between the convex rib and the shell.

4. The method for manufacturing a bimetallic composite brake drum according to claim 1 or 2, characterized in that: The plurality of convex ribs are arranged at equal intervals in the circumferential direction.

5. The method for manufacturing a bimetallic composite brake drum according to claim 1 or 2, characterized in that: The housing is formed with a plurality of annular protrusions and annular recesses arranged alternately along the axial direction, and the annular protrusions and the annular recesses cooperate to form the first wave-shaped structure; The first wavy structure includes an outer wavy wall surface and an inner wavy wall surface corresponding to the outer wavy wall surface, and the second wavy structure is adapted to the inner wavy wall surface.

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