Casting mold of brake drum

Abstract

The utility model relates to the technical field of casting equipment, in particular to a brake drum casting mold which comprises a workbench, a lower mold, a forming plate, an upper mold and a forming assembly. The lower die is arranged on the working table, and the lower die is connected with the working table; the forming plate is coaxially arranged on the lower die, and the forming plate is connected with the lower die; the upper die is coaxially arranged on the lower die, and a forming cavity used for forming a drum body of the brake drum is formed among the upper die, the lower die and the forming plate; a pouring gate is formed in the top of the upper mold and communicates with the interior of the forming cavity; the forming assembly is arranged in the forming cavity and is used for forming the first mounting hole and the second mounting hole; and a fixing assembly is arranged between the lower mold and the upper mold and is used for fixing the lower mold and the upper mold. Production of the brake drum can be facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of casting equipment, and in particular to a casting mold for a brake drum. Background Art

[0002] As an important automotive component, the brake drum plays a vital role in modern transportation systems. To facilitate installation, existing brake drums typically have a first mounting hole and a second mounting hole. The axis of the first mounting hole aligns with the axis of the brake drum, and multiple second mounting holes are provided along the circumference of the brake drum. Together, the first and second mounting holes form a flange.

[0003] During the production of these brake drums, the drum body is typically first cast using a mold. The first and second mounting holes are then machined into the drum body. Machining the drum body also requires repositioning and alignment, measuring the positions of the first and second mounting holes, and then drilling. This process is not only prone to deviation but also complex, causing inconvenience in brake drum production. Utility Model Content

[0004] In order to facilitate the production of a brake drum, the present application provides a casting mold for a brake drum.

[0005] The present application provides a brake drum casting mold, which adopts the following technical solution:

[0006] A casting mold for a brake drum comprises a workbench, a lower mold, a molding plate, an upper mold and a molding assembly; the lower mold is arranged on the workbench, and the lower mold is connected to the workbench; the molding plate is coaxially arranged on the lower mold, and the molding plate is connected to the lower mold; the upper mold is coaxially arranged on the lower mold, and a molding cavity for molding the drum body of the brake drum is formed between the upper mold, the lower mold and the molding plate; a casting port is provided at the top of the upper mold, and the casting port is connected to the inside of the molding cavity; the molding assembly is arranged in the molding cavity and is used to mold a first mounting hole and a second mounting hole; a fixing assembly is provided between the lower mold and the upper mold, and the fixing assembly is used to fix the lower mold and the upper mold.

[0007] By adopting the above technical solution, when casting and producing the brake drum, the operator first uses the fixing component to fix the upper mold and the lower mold, and then injects the molten metal into the molding cavity through the casting port. After standing and cooling for a certain period of time, the molten metal in the molding cavity cools to form the drum body of the brake drum, and under the action of the molding component, the first mounting hole and the second mounting hole are formed on the drum body of the brake drum, thereby avoiding the need to re-position and align the brake drum during subsequent mechanical processing, and there is no need to measure the processing position of the first mounting hole and the second mounting hole, reducing the processing steps of the brake drum, and thus facilitating the production of the brake drum.

[0008] Optionally, the forming assembly includes a forming ring and a forming column; the forming ring is coaxially arranged in the forming cavity, and the forming ring is fixedly connected to the upper mold; a first matching groove is coaxially opened on the forming plate, the first matching groove is adapted to the forming ring, and one end of the forming ring is located in the first matching groove; the forming column is located in the forming cavity, and a plurality of the forming columns are evenly arranged along the circumference of the forming ring, and the forming column is fixedly connected to the upper mold; a plurality of second matching grooves are opened on the forming plate, the second matching grooves correspond one-to-one to the forming columns, the second matching grooves are adapted to the forming columns, and one end of the forming column is located in the second matching groove.

[0009] By adopting the above technical solution, the first mounting hole and the second mounting hole are respectively formed by using a molding ring and a molding column arranged in the molding cavity, and by setting the bottom end of the molding ring in the first matching groove and the bottom end of the molding column in the second matching groove, it is possible to avoid the first mounting hole and the second mounting hole being blocked during molding, thereby avoiding the need to re-drill the first mounting hole and the second mounting hole subsequently.

[0010] Optionally, the fixing assembly includes a first fixing ring and a second fixing ring, the first fixing ring is fixedly set on the lower mold, and the second fixing ring is fixedly set on the upper mold, and fixing holes are provided on the first fixing ring and the second fixing ring, and the first fixing ring and the second fixing ring are fixed by bolts passing through the fixing holes.

[0011] By adopting the above technical solution, the first fixing ring and the second fixing ring are fixed by using bolts passing through the fixing holes on the first fixing ring and the second fixing ring, thereby fixing the upper mold and the lower mold, and clamping the forming plate, the forming ring and the forming column between the lower mold and the upper mold.

[0012] Optionally, the lower mold is rotatably connected to the workbench; a limiting block is fixedly provided on the forming plate; a limiting groove is provided on the lower mold, the limiting block is adapted to the limiting groove, and the limiting block is located in the limiting groove; a funnel is fixedly provided on the upper mold, the funnel is located at the opening of the casting port, and an end cover is detachably connected to the funnel; a driving assembly is provided on the workbench, and the driving assembly is used to drive the lower mold to rotate.

[0013] By adopting the above technical solution, the forming plate is limited by the limiting blocks and limiting grooves, which makes it easier for the operator to install the forming plate on the top of the lower mold, avoiding deviations and preventing relative rotation between the forming plate and the lower mold. When casting the brake drum, the operator injects the molten metal into the molding cavity and fixes the end cover on the funnel to prevent the molten metal from spilling or being contaminated by external impurities. After the end cover is installed, the drive assembly is used to drive the lower mold to rotate, thereby driving the forming plate and the upper mold to rotate, causing the molten metal in the molding cavity to perform centrifugal motion. Under the action of centrifugal force, the bubbles inside the molten metal move toward the side walls of the molding cavity and adhere to the side walls of the molding cavity, thereby discharging the bubbles inside the molten metal and avoiding affecting the quality of the produced brake drum.

[0014] Optionally, the drive assembly includes an outer ring gear, a gear and a motor; the outer ring gear is coaxially fixed on the lower mold; the gear is engaged with the outer ring gear; the motor is fixed on the workbench, and the output shaft of the motor is coaxially fixedly connected to the gear.

[0015] By adopting the above technical solution, the motor is used to drive the gear to rotate, and the gear then drives the outer ring to rotate, thereby driving the lower mold to rotate.

[0016] Optionally, a demoulding assembly is provided on the workbench, and the demoulding assembly includes an ejector column and a hydraulic cylinder; the ejector column is coaxially arranged with the forming plate, and the ejector column is passed through the forming plate, and one end of the ejector column is located in the forming ring and abuts against the upper mold; the fixed end of the hydraulic cylinder is fixedly provided on the workbench, and the movable end of the hydraulic cylinder is fixedly connected to the ejector column.

[0017] By adopting the above technical solution, after the molten metal has cooled and settled, the operator removes the bolts inserted into the fixing holes and then starts the hydraulic cylinder. The hydraulic cylinder drives the ejector column to move upward, thereby lifting the upper mold upward and separating it from the formed brake drum. The operator can then remove the upper mold, making it easier for the operator to demold the formed brake drum.

[0018] Optionally, the demoulding assembly further includes an ejection ring, which is coaxially fixed on the ejection column. The ejection ring is located at the bottom of the forming plate, and an idle travel gap is left between the ejection ring and the forming plate.

[0019] By adopting the above technical solution, after the upper mold is removed, the hydraulic cylinder continues to work, driving the ejector column and the ejector ring to continue to move upward. At this time, the ejector ring abuts against the forming plate, and the ejector ring drives the forming plate to move upward, lifting the formed brake drum upward and separating it from the lower mold. Then the operator removes the formed brake drum from the forming plate and can continue to cast the next brake drum.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] By providing a forming assembly, the first mounting hole and the second mounting hole are formed simultaneously with the casting of the brake drum body, thereby avoiding the need to reposition and align the brake drum during subsequent machining, and eliminating the need to measure the machining positions of the first mounting hole and the second mounting hole, thereby reducing the number of machining steps for the brake drum and facilitating the production of the brake drum.

[0022] By setting up a drive component, before the molten metal cools and forms, the operator drives the lower mold to rotate, thereby driving the forming plate and the upper mold to rotate, causing the molten metal in the forming cavity to perform centrifugal motion. Under the action of centrifugal force, the bubbles inside the molten metal move toward the side walls of the forming cavity and adhere to the side walls of the forming cavity, thereby expelling the bubbles inside the molten metal and avoiding affecting the quality of the brake drum produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of an embodiment of the present application;

[0024] Figure 2 is a cross-sectional view of an embodiment of the present application;

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0026] Description of reference numerals:

[0027] 1. Workbench;

[0028] 2. Lower mold; 21. Molding cavity; 22. Limiting groove;

[0029] 3. Forming plate; 31. First matching groove; 32. Second matching groove; 33. Limiting block;

[0030] 4. Upper mold; 41. Casting gate; 42. Funnel; 421. End cap;

[0031] 5. Molding component; 51. Molding ring; 52. Molding column;

[0032] 6. Fixing assembly; 61. First fixing ring; 62. Second fixing ring;

[0033] 7. Drive assembly; 71. Outer ring gear; 72. Gear; 73. Motor;

[0034] 8. Demolding assembly; 81. Ejector column; 82. Hydraulic cylinder; 83. Ejector ring. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-3 This application is described in further detail.

[0036] The present application embodiment discloses a casting mold for a brake drum. Figure 1 and Figure 2 The casting mold of the brake drum includes a workbench 1, a lower mold 2, a forming plate 3 and an upper mold 4. The lower mold 2 is rotatably arranged on the workbench 1, and the rotation axis is vertically arranged. The forming plate 3 is coaxially arranged on the top of the lower mold 2.

[0037] Reference Figure 2 and Figure 3 The lower mold 2 has four limit slots 22 evenly spaced along its circumference. The bottom of the forming plate 3 has four limit blocks 33 evenly spaced along its circumference. Each limit block 33 corresponds to and fits within the limit slots 22. The limit blocks 33 are positioned within the limit slots 22 and are fixedly connected to the forming plate 3. The upper mold 4 is coaxially positioned on top of the lower mold 2. A forming cavity 21 for forming the brake drum body is formed between the lower mold 2, the forming plate 3, and the upper mold 4.

[0038] Reference Figure 3 The top of the upper mold 4 is provided with a pouring port 41, which is in communication with the interior of the molding cavity 21. A funnel 42 is provided at the opening of the pouring port 41. The funnel 42 is fixedly connected to the upper mold 4. The inner sidewall of the funnel 42 is tapered in a vertically downward direction, and the funnel 42 is in communication with the pouring port 41. An end cap 421 is threadedly connected to the top of the funnel 42.

[0039] Reference Figure 2 and Figure 3 The upper mold 4 is provided with a molding assembly 5, which includes a molding ring 51 and a molding column 52. A first mating groove 31 is coaxially formed on the top of the molding plate 3, and the first mating groove 31 is adapted to fit the molding ring 51. The molding ring 51 is coaxially arranged in the molding cavity 21. The top end of the molding ring 51 is fixedly connected to the upper mold 4, and the bottom end of the molding ring 51 is located in the first mating groove 31 and abuts against the molding plate 3. The molding ring 51 is used to form the first mounting hole.

[0040] Four second mating grooves 32 are evenly spaced along the circumference of the top of the forming plate 3. Forming posts 52 are located within the forming cavity 21. Four forming posts 52 are evenly spaced along the circumference of the forming ring 51, corresponding one-to-one with the second mating grooves 32. The second mating grooves 32 are adapted to fit the forming posts 52. The top ends of the forming posts 52 are fixedly connected to the upper mold 4, while the bottom ends of the forming posts 52 are located within the second forming grooves and abut against the forming plate 3. The forming posts 52 are used to form the second mounting hole.

[0041] Reference Figure 1 and Figure 2 A fixing assembly 6 is provided between the lower mold 2 and the upper mold 4. The fixing assembly 6 includes a first fixing ring 61 and a second fixing ring 62. The first fixing ring 61 is coaxially fixed on the outer wall of the lower mold 2, and the second fixing ring 62 is coaxially fixed on the outer wall of the upper mold 4. Four fixing holes are provided on the first fixing ring 61 and the second fixing ring 62. The first fixing ring 61 and the second fixing ring 62 are fixed by bolts passing through the fixing holes.

[0042] A drive assembly 7 is mounted on the workbench 1 and includes an outer ring gear 71, a gear 72, and a motor 73. The outer ring gear 71 is coaxially fixed to the outer wall of the lower mold 2. The gear 72 meshes with the outer ring gear 71. The motor 73 is fixed to the top of the workbench 1. The output shaft of the motor 73 is coaxially fixedly connected to the gear 72, and the motor 73 is used to drive the gear 72 to rotate.

[0043] Reference Figure 2 A demoulding assembly 8 is provided on the workbench 1, and the demoulding assembly 8 includes an ejector column 81, an ejector ring 83, and a hydraulic cylinder 82. The ejector column 81 is coaxially passed through the forming plate 3, and the top of the ejector column 81 is located in the forming ring 51 and abuts against the upper mold 4. The ejector ring 83 is located at the bottom of the forming plate 3 and is coaxially fixedly connected to the ejector column 81. An idle travel gap is left between the ejector ring 83 and the forming plate 3. The hydraulic cylinder 82 is coaxially arranged at the bottom of the forming plate 3. The fixed end of the hydraulic cylinder 82 is fixedly connected to the workbench 1, and the movable end of the hydraulic cylinder 82 is fixedly connected to the ejector column 81.

[0044] The implementation principle of a brake drum casting mold in the embodiment of the present application is as follows:

[0045] When casting the brake drum, the operator first sets the forming plate 3 coaxially on the top of the lower mold 2, and makes the limit block 33 located in the limit groove 22, and then sets the upper mold 4 coaxially on the top of the lower mold 2, and uses the bolts passed through the fixing holes to fix the upper mold 4 and the lower mold 2. At this time, the forming ring 51 and the forming column 52 are located between the upper mold 4 and the forming plate 3, thereby fixing the forming plate 3 to the lower mold 2.

[0046] Then, the operator injects the molten metal into the molding cavity 21 through the casting port 41, and then threadably connects the end cover 421 to the funnel 42, and starts the motor 73. The motor 73 drives the gear 72 to rotate, thereby driving the outer ring gear 71 and the lower mold 2 to rotate together. The lower mold 2 drives the molding plate 3 and the upper mold 4 to rotate, so that the molten metal in the molding cavity 21 performs centrifugal motion. Under the action of centrifugal force, the bubbles inside the molten metal move toward the side wall of the molding cavity 21 and adhere to the side wall of the molding cavity 21. After a certain period of time, the operator turns off the motor 73. After standing for a certain period of time, the molten metal in the molding cavity 21 cools and is formed into the drum body of the brake drum. Under the action of the molding ring 51, a first mounting hole is formed on the drum body of the brake drum. Under the action of the molding column 52, a second mounting hole is formed on the drum body of the brake drum, and the brake drum casting is completed.

[0047] Then the operator removes the bolts passed through the fixing holes and starts the hydraulic cylinder 82. The hydraulic cylinder 82 drives the ejector column 81 to move upward, thereby lifting the upper mold 4 upward, so that the upper mold 4, the forming ring 51 and the forming column 52 are separated from the drum body of the formed brake drum. Then the operator removes the upper mold 4. During this process, the ejector ring 83 moves in the idle stroke gap between itself and the forming plate 3 until it abuts against the forming plate 3. The hydraulic cylinder 82 continues to work, driving the ejector column 81 to continue to move upward. The ejector column 81 drives the ejector ring 83 to continue to move upward. The ejector ring 83 pushes the forming plate 3 upward, thereby making the drum body of the formed brake drum away from the lower mold 2. The operator removes the brake drum and can continue with the casting production of the next brake drum.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A casting mold for a brake drum, characterized in that: The invention comprises a workbench (1), a lower mold (2), a molding plate (3), an upper mold (4) and a molding assembly (5); the lower mold (2) is arranged on the workbench (1), and the lower mold (2) is connected to the workbench (1); the molding plate (3) is coaxially arranged on the lower mold (2), and the molding plate (3) is connected to the lower mold (2); the upper mold (4) is coaxially arranged on the lower mold (2), and the upper mold (4), the lower mold (2) and the molding plate (3) are coaxially arranged on the lower mold (2). A molding cavity (21) for molding the drum body of the brake drum is formed between the upper mold (4); a casting port (41) is provided on the top of the upper mold (4), and the casting port (41) is communicated with the interior of the molding cavity (21); the molding component (5) is arranged in the molding cavity (21) and is used to mold the first mounting hole and the second mounting hole; a fixing component (6) is provided between the lower mold (2) and the upper mold (4), and the fixing component (6) is used to fix the lower mold (2) and the upper mold (4).

2. The brake drum casting mold according to claim 1, characterized in that: The molding assembly (5) includes a molding ring (51) and a molding column (52); the molding ring (51) is coaxially arranged in the molding cavity (21), and the molding ring (51) is fixedly connected to the upper mold (4); a first matching groove (31) is coaxially opened on the molding plate (3), the first matching groove (31) is adapted to the molding ring (51), and one end of the molding ring (51) is located in the first matching groove (31); the molding column (52) is located in the molding cavity (21), and a plurality of molding columns (52) are evenly arranged along the circumference of the molding ring (51), and the molding columns (52) are fixedly connected to the upper mold (4); a plurality of second matching grooves (32) are opened on the molding plate (3), the second matching grooves (32) correspond to the molding columns (52) one by one, the second matching grooves (32) are adapted to the molding columns (52), and one end of the molding column (52) is located in the second matching groove (32).

3. The brake drum casting mold according to claim 2, characterized in that: The fixing assembly (6) comprises a first fixing ring (61) and a second fixing ring (62), wherein the first fixing ring (61) is fixedly arranged on the lower mold (2), and the second fixing ring (62) is fixedly arranged on the upper mold (4), and the first fixing ring (61) and the second fixing ring (62) are both provided with fixing holes, and the first fixing ring (61) and the second fixing ring (62) are fixed by bolts passing through the fixing holes.

4. The brake drum casting mold according to claim 1, characterized in that: The lower mold (2) is rotatably connected to the workbench (1); a limiting block (33) is fixedly provided on the forming plate (3); a limiting groove (22) is provided on the lower mold (2), the limiting block (33) is adapted to the limiting groove (22), and the limiting block (33) is located in the limiting groove (22); a funnel (42) is fixedly provided on the upper mold (4), the funnel (42) is located at the opening of the casting port (41), and an end cover (421) is detachably connected to the funnel (42); a driving assembly (7) is provided on the workbench (1), and the driving assembly (7) is used to drive the lower mold (2) to rotate.

5. The brake drum casting mold according to claim 4, characterized in that: The driving assembly (7) comprises an outer gear ring (71), a gear (72) and a motor (73); the outer gear ring (71) is coaxially fixedly arranged on the lower mold (2); the gear (72) is meshed with the outer gear ring (71); the motor (73) is fixedly arranged on the workbench (1), and the output shaft of the motor (73) is coaxially fixedly connected to the gear (72).

6. The brake drum casting mold according to claim 2, characterized in that: A demoulding assembly (8) is provided on the workbench (1), and the demoulding assembly (8) includes an ejector column (81) and a hydraulic cylinder (82); the ejector column (81) is coaxially arranged with the forming plate (3), and the ejector column (81) is passed through the forming plate (3), and one end of the ejector column (81) is located in the forming ring (51) and abuts against the upper mold (4); the fixed end of the hydraulic cylinder (82) is fixedly provided on the workbench (1), and the movable end of the hydraulic cylinder (82) is fixedly connected to the ejector column (81).

7. The brake drum casting mold according to claim 6, characterized in that: The demoulding assembly (8) further comprises an ejection ring (83), wherein the ejection ring (83) is coaxially fixedly arranged on the ejection column (81), and the ejection ring (83) is located at the bottom of the forming plate (3), with an idle travel gap between the ejection ring (83) and the forming plate (3).

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