Vertical centrifugal casting mold for brake disc

Abstract

The utility model discloses a kind of brake disc vertical centrifugal casting mould, it relates to automobile parts production equipment technical field, the brake disc vertical centrifugal casting mould includes: spraying chassis, for connecting speed reducer, speed reducer is used to connect driving motor;Faceplate sand mould, annular structure, faceplate sand mould is located on the upper surface of spraying chassis, the surface of faceplate sand mould is equipped with perforation;Spraying top disc, annular structure, spraying top disc is buckled on the upper surface of faceplate sand mould, the inner diameter of spraying top disc is greater than the inner diameter of faceplate sand mould;Flange sand mould, annular structure, it is located in the inner periphery of spraying top disc;Outer bushing, annular structure, outer bushing is buckled on the upper surface of flange sand mould;Inner mould, it is located in the outer bushing inner periphery of spraying top disc, flange sand mould, inner mould is abutted to faceplate sand mould, so that spraying chassis, faceplate sand mould, spraying top disc, flange sand mould, outer bushing and the preset cavity between inner mould are formed. A kind of brake disc vertical centrifugal casting mould provided in the application can reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts production equipment technology, and more specifically, to a vertical centrifugal casting mold for brake discs. Background Technology

[0002] Centrifugal casting is a process that uses a rotating mold (centrifugal force) to force molten metal to adhere tightly to the mold cavity and form a shape. It is particularly suitable for cylindrical, ring-shaped, or symmetrical parts (such as piston rings, cylinder liners, and pipes). Existing vertical centrifugal casting uses a single sub-bundle to pour the castable into the mold cavity at once, which can only produce castings of a single material.

[0003] Traditional gray cast iron brake discs have advantages such as good wear resistance, moderate heat dissipation, and low cost. However, the flange portion of gray cast iron brake discs is prone to cracking due to its low strength. To solve the problem of flange cracking, existing technologies use composite brake discs. For example, a two-stage casting process is used to obtain the flange portion and the brake disc body portion separately. That is, the brake disc is first cast, polished, and then placed in a sand mold or sand box for a second casting to obtain a composite material brake disc.

[0004] Currently, there are two types of molds used for centrifugal casting. One type uses horizontal centrifugal casting, which is not convenient for automated casting and therefore has a relatively high casting cost. The other type of mold requires multiple intermediate processes during the batch casting process, such as shot blasting of the moving plate, refilling the sand mold, and preheating. These intermediate processes result in high costs.

[0005] In conclusion, how to reduce production costs is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a vertical centrifugal casting mold for brake discs, which uses centrifugal force and gravity to cast composite material products in stages into a preset cavity, eliminating the need for intermediate steps and reducing production costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A vertical centrifugal casting mold for brake discs includes:

[0009] A spray-painted chassis is used to connect a reducer, which is used to connect a drive motor.

[0010] The flower disc sand mold has a ring structure and is located on the upper surface of the spraying base. The surface of the flower disc sand mold has perforations.

[0011] The spraying top plate has a ring structure and is fastened to the upper surface of the flower plate sand mold. The inner diameter of the spraying top plate is larger than the inner diameter of the flower plate sand mold.

[0012] The flange sand mold is a ring structure and is located on the inner circumference of the spraying top plate;

[0013] The outer gating sleeve has a ring structure and is fastened to the upper surface of the flange sand mold;

[0014] An inner mold is disposed on the inner periphery of the outer sprue of the spraying top plate and the flange sand mold. The inner mold abuts against the flower plate sand mold, so that a preset cavity is formed between the spraying base plate, the flower plate sand mold, the spraying top plate, the flange sand mold, the outer sprue and the inner mold.

[0015] Preferably, the upper surface of the flower-shaped sand mold is provided with an upper annular recess, and the lower surface of the flower-shaped sand mold is provided with a lower annular recess. The upper annular recess and the lower annular recess are connected by a plurality of evenly distributed perforations.

[0016] Preferably, the upper surface edge of the spraying chassis is provided with a first annular protrusion, and the lower surface edge of the spraying top plate is provided with a second annular protrusion. The inner diameter of the first annular protrusion is equal to the inner diameter of the second annular protrusion, and the inner diameter of the first annular protrusion is equal to the outer diameter of the flower disc sand mold.

[0017] Preferably, the upper inner circumference of the spraying top plate is provided with an annular groove, the outer diameter of the flange sand mold is the same as the inner diameter of the annular groove, and the flange sand mold is disposed in the annular groove.

[0018] Preferably, the upper end of the inner circumference of the flange sand mold is provided with an annular groove, and the inner diameter of the outer casting sleeve is smaller than the inner diameter of the annular groove.

[0019] Preferably, a third annular protrusion is provided at the lower surface edge of the outer casting sleeve, and the inner diameter of the third annular protrusion is the same as the outer diameter of the flange sand mold.

[0020] Preferably, the top edge of the inner circumference of the outer sprue is chamfered, and the top edge of the inner mold is also chamfered.

[0021] Preferably, the lower surface of the spraying chassis is provided with a circular groove for connecting the reducer.

[0022] Preferably, the spraying base, the flower plate sand mold, the spraying top plate, the flange sand mold, the outer casting sleeve, and the inner mold are arranged collinearly on the straight line containing their central axes.

[0023] Preferably, the top end of the inner mold is provided with a threaded hole.

[0024] This utility model provides a vertical centrifugal casting mold for brake discs, which consists of a sprayed base plate, a flower plate sand mold, a sprayed top plate, a flange sand mold, and an outer casting sleeve arranged sequentially from bottom to top. The flower plate sand mold, the sprayed top plate, the flange sand mold, and the outer casting sleeve are all annular components. An inner mold is provided on the inner circumference of the flower plate sand mold, the sprayed top plate, the flange sand mold, and the outer casting sleeve. The space between the inner mold and the outer casting sleeve allows molten iron to be poured into a preset cavity. The molten iron can gradually fill the preset cavity. Through the cooperation of a drive motor and a reducer, the entire casting mold is driven to rotate on a fixed axis. By using centrifugal force and gravity in combination, a composite material casting product (composite brake disc or brake drum) is obtained by multiple castings in a preset cavity at the same station. This eliminates the intermediate process step of secondary casting when casting composite material products in the prior art, thus reducing production costs.

[0025] This utility model also provides a casting method suitable for the vertical centrifugal casting mold of the brake disc. By pouring a first type of molten iron between the inner mold and the outer sprue, the corresponding drive motor drives the entire mold to rotate centrifugally according to the first output power. Then, a second type of molten iron is poured between the inner mold and the outer sprue, and the corresponding drive motor drives the entire mold to rotate centrifugally according to the second output power. Compared with the prior art, the intermediate steps between the two molten iron pouring processes are greatly reduced, thus reducing production costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 The image shows a bottom view of the vertical centrifugal casting mold for the brake disc provided by this utility model.

[0028] Figure 2 This is a top view of the vertical centrifugal casting mold for brake disc provided by this utility model.

[0029] Figure 3 for Figure 1 Cross-sectional view of AA;

[0030] Figure 4 This is a cross-sectional view of the brake disc blank provided by this utility model.

[0031] Figure label:

[0032] 1-Spray-coated chassis; 101-First annular protrusion; 2-Flower-shaped sand mold; 201-Perforation; 202-Upper annular recess; 203-Lower annular recess; 3-Spray-coated top plate; 301-Second annular protrusion; 4-Flange sand mold; 5-Outer casting sleeve; 501-Third annular protrusion; 6-Inner mold; 7-Brake disc. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] The core of this utility model is to provide a vertical centrifugal casting mold for brake discs. During the casting process using this mold, molten iron can be poured in batches, reducing the intermediate steps between the two pouring processes and lowering production costs.

[0035] Another core aspect of this invention is to provide a method applicable to the aforementioned vertical centrifugal casting mold for brake discs.

[0036] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] This application provides a vertical centrifugal casting mold for a brake disc, comprising: a spraying base plate, a flower plate sand mold 2, a spraying top plate 3, a flange sand mold 4, an outer casting sleeve 5, and an inner mold 6;

[0038] Among them, the spraying chassis 1 is used to connect the reducer, and the reducer is used to connect the drive motor;

[0039] The flower disc sand mold 2 has a ring structure and is located on the upper surface of the spraying base plate 1. The surface of the flower disc sand mold 2 is provided with perforations 201.

[0040] The spraying top plate 3 has a ring structure and is fastened to the upper surface of the flower plate sand mold 2. The inner diameter of the spraying top plate 3 is larger than the inner diameter of the flower plate sand mold 2.

[0041] The flange sand mold 4 is a ring structure and is located on the inner circumference of the spray top plate 3;

[0042] The outer casting sleeve 5 is a ring structure, and the outer casting sleeve 5 is fastened to the upper surface of the flange sand mold 4;

[0043] The inner mold 6 is located on the inner periphery of the outer sprue 5 of the spray top plate 3 and the flange sand mold 4. The inner mold 6 abuts against the flower plate sand mold 2 so that a preset cavity is formed between the spray bottom plate 1, the flower plate sand mold 2, the spray top plate 3, the flange sand mold 4, the outer sprue 5 and the inner mold 6.

[0044] For details, please refer to the appendix. Figure 1 Appendix Figure 2 With appendix Figure 3 The brake disc spraying chassis 1 is connected to the reducer and can rotate with the reducer. The reducer is connected to the drive motor, which is connected to the center of the spraying chassis 1 and can drive the spraying chassis 1 to rotate on a fixed axis. On the spraying chassis 1, a flower plate sand mold 2, a spraying top plate 3, a flange sand mold 4, and an outer pouring sleeve 5 are arranged in sequence. An inner mold 6 is set on the inner circumference of the flower plate sand mold 2, the spraying top plate 3, the flange sand mold 4, and the outer pouring sleeve 5 to form a preset cavity. By pouring molten iron into the gap between the outer pouring sleeve 5 and the inner mold 6, product casting can be carried out. After pouring the molten iron, the drive motor can drive the reducer and the entire mold to rotate centrifugally. By using centrifugal force and gravity in combination, composite material casting products (composite brake disc 7 or brake drum) are obtained by pouring in stages in the preset cavity. This eliminates the intermediate process steps such as shot blasting, refilling the sand mold, and preheating in the secondary casting method of casting composite material products in the prior art. The solution of this application has fewer overall processes and thus lower costs.

[0045] It should be noted that the batch vertical centrifugal casting of this application does not limit the shape and structure of the product. No additional preheating process is required between the two castings. In addition, the position and shape of the interface between adjacent castings can be adjusted by adjusting the centrifugal speed so that the interface is located in a suitable stress position and avoids stress concentration positions or positions with poor stress conditions.

[0046] Based on the above embodiment, the upper surface of the flower disc sand mold 2 is provided with an upper annular recess 202, and the lower surface of the flower disc sand mold 2 is provided with a lower annular recess 203. The upper annular recess 202 and the lower annular recess 203 are connected by a number of evenly distributed perforations 201.

[0047] For details, please refer to the appendix. Figure 3 The upper annular recess 202 and the lower annular recess 203 are connected by several evenly distributed perforations 201. When the molten iron reaches the upper annular recess 202, it can flow from the perforations 201 into the space between the lower annular recess 203 and the upper surface of the spraying chassis 1. Since the entire casting mold is in a centrifugal state when the molten iron is injected, it can ensure that the space is filled with molten iron.

[0048] Based on the above embodiment, the upper surface edge of the spraying chassis 1 is provided with a first annular protrusion 101, and the lower surface edge of the spraying top plate 3 is provided with a second annular protrusion 301. The inner diameter of the first annular protrusion 101 is equal to the inner diameter of the second annular protrusion 301, and the inner diameter of the first annular protrusion 101 is equal to the outer diameter of the flower disc sand mold 2.

[0049] Specifically, the lower surface of the flower disc sand mold 2 is fastened to and abuts against the inner circumference of the first annular protrusion 101, and the upper surface of the flower disc sand mold 2 is fastened to the spray top plate 3. The inner circumference of the second annular protrusion 301 abuts against the flower disc sand mold 2. Generally, relative rotation can be avoided by gravity, but glue needs to be injected between the first annular protrusion 101 and the flower disc sand mold 2, and between the second annular protrusion 301 and the flower disc sand mold 2, to ensure the integrity of the structure.

[0050] Based on the above embodiment, an annular groove is provided on the upper inner circumference of the spray top plate 3, the outer diameter of the flange sand mold 4 is the same as the inner diameter of the annular groove, and the flange sand mold 4 is located in the annular groove.

[0051] For details, please refer to the appendix. Figure 3 The inner diameter of the annular groove on the inner circumference of the spraying top plate 3 matches the outer diameter of the flange sand mold 4, which facilitates the installation of the casting mold, ensures that the flange sand mold 4 and the spraying top plate 3 can rotate coaxially, and also prevents molten iron from leaving the preset cavity, thus improving the safety factor.

[0052] Based on the above embodiment, the upper end of the inner circumference of the flange sand mold 4 is provided with an annular groove, and the inner diameter of the outer casting sleeve 5 is smaller than the inner diameter of the annular groove.

[0053] Specifically, the upper side of the flange sand mold 4 is also provided with an annular groove, but the setting of the annular groove is selected according to the structure of the brake disc 7. When producing other products, such as brake drums, it can be adjusted according to the actual situation.

[0054] Based on the above embodiment, a third annular protrusion 501 is provided at the lower surface edge of the outer casting sleeve 5, and the inner diameter of the third annular protrusion 501 is the same as the outer diameter of the flange sand mold 4.

[0055] Specifically, the third annular protrusion 501 can be fitted onto the outer periphery of the flange sand mold 4 to maintain the stability of the overall structure. At the same time, it can also prevent molten iron from leaving the preset cavity during centrifugation, thereby improving the safety factor.

[0056] Based on the above embodiment, the top edge of the inner circumference of the outer sprue 5 is chamfered, and the top edge of the inner mold 6 is also chamfered.

[0057] Specifically, a chamfer is provided on the inner circumference of the outer sprue 5, and a corresponding chamfer is provided on the top of the inner mold 6, which can form two inclined surfaces. Similarly, under this condition, the size of the port used for injecting molten iron at the upper end of the inner mold 6 and the outer sprue 5 can be increased to reduce the difficulty of injecting molten iron, that is, to reduce the production difficulty and improve the production safety factor.

[0058] Based on the above embodiment, the lower surface of the spraying chassis 1 is provided with a circular groove for connecting the reducer.

[0059] Specifically, the lower surface of the spraying chassis 1 is provided with a circular groove, into which the reducer can be inserted and fixedly connected to the bottom of the spraying chassis 1, so that the output end of the reducer can drive the spraying chassis 1 to rotate synchronously centrifugally.

[0060] Based on the above embodiment, the spraying base 1, the flower plate sand mold 2, the spraying top plate 3, the flange sand mold 4, the outer pouring sleeve 5, and the inner mold 6 are arranged on the same straight line.

[0061] Specifically, the central axes of the spraying base 1, the flower plate sand mold 2, the spraying top plate 3, the flange sand mold 4, the outer pouring sleeve 5, and the inner mold 6 are arranged in a straight line to ensure that the blank can be produced smoothly when the drive motor is working.

[0062] Based on the above embodiment, the top of the inner mold 6 is provided with a threaded hole.

[0063] Specifically, the top of the inner mold 6 is provided with a threaded hole, which can be used to connect to structures such as a cover to prevent molten iron from leaving the preset cavity during centrifugation, ensuring safety during the production process. It can also be connected to the hoisting components for easy demolding.

[0064] In addition to the aforementioned vertical centrifugal casting mold for brake discs, this utility model also provides a casting method applicable to the vertical centrifugal casting mold for brake discs disclosed in the above embodiments, the casting method comprising:

[0065] A preset amount of the first type of molten iron is injected between the inner mold 6 and the outer gating sleeve 5, and the drive motor drives the mold to rotate according to the first power.

[0066] A preset amount of molten iron is injected between the inner mold 6 and the outer gating sleeve 5, and the drive motor drives the mold to rotate according to the second power.

[0067] Specifically, paint is sprayed onto the preheated spraying base 1 and the underside of the spraying top 3; on the casting machine, the pre-set cavities are assembled sequentially according to the installation method described above. The casting machine is started at a speed of 50-200 rpm; first, a fixed quantity of HT250 molten iron is poured in. The composition of the HT250 molten iron is as follows (percentage content):

[0068] C: 3.4~3.6

[0069] Si: 2.4~2.8

[0070] Mn: 0.4~0.7

[0071] P: ≤0.03

[0072] S: ≤0.025

[0073] Cu: 0.3–0.6

[0074] Sn: 0.02~0.04

[0075] Molten iron in the first transfer ladle is poured into the gap between the outer casting sleeve 5 and the inner metal mold 6. Under the combined action of gravity and centrifugal force, the molten iron fills the flower plate portion of the brake disc blank. The spheroidizing agent is placed in advance using the "sandwich method." When the molten iron temperature reaches 1480-1550℃, it is poured into the second transfer ladle. After waiting 40-60 seconds for the spheroidizing reaction, pouring is proceeded. After the first transfer ladle pouring is completed, the pouring machine speed is adjusted to 20-100 rpm, and the QT500-7 molten iron in the second transfer ladle is poured in. The composition of QT500-7 is as follows (percentage content):

[0076] C: 3.6~3.9

[0077] Si: 2.4~2.8

[0078] Mn: 0.4~0.7

[0079] P: ≤0.03

[0080] S: ≤0.025

[0081] Re′: 0.020~0.045

[0082] Mg′: 0.020~0.040

[0083] Cu: 0.2–0.4

[0084] After the casting is completed, the speed of the casting machine is adjusted to 100 rpm. During the rotation cooling and solidification process, due to the action of centrifugal force, low-density impurities move towards the inner wall of the brake disc blank and stick to the outer surface of the brake disc metal inner mold 6.

[0085] The principle behind the movement of impurities is as follows: since the density of impurities is less than that of molten iron, in the liquid state, impurities in the molten iron will float upwards under the action of buoyancy (similar to a balloon placed in water). The centrifugal force is used to make the pure molten iron flow outwards, while the impurities, being lighter, experience less centrifugal force and will move inwards and float upwards, eventually distributing along the top and inner wall of the blank (this part is the allowance for subsequent processing and will be processed off in subsequent steps).

[0086] After 3-10 minutes, the temperature of the brake disc blank drops to 500-800℃. Stop rotating, lift out the inner mold 6 of the brake disc, remove the outer casting sleeve 5 in sequence, spray the top plate 3, remove the blank, put the brake disc blank into the heat preservation box, keep it in the heat preservation for 3-5 hours to relieve stress, take it out, and after it has completely cooled, shot blast it to obtain the composite brake disc blank.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0088] The above provides a detailed description of a vertical centrifugal casting mold for a brake disc provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A vertical centrifugal casting mold for a brake disc, characterized in that, include: A spray-painted chassis (1) is used to connect a reducer, which is used to connect a drive motor; The flower plate sand mold (2) is a ring structure. The flower plate sand mold (2) is located on the upper surface of the spraying base plate (1). The surface of the flower plate sand mold (2) is provided with perforations (201). The spraying top plate (3) is a ring structure. The spraying top plate (3) is fastened to the upper surface of the flower plate sand mold (2). The inner diameter of the spraying top plate (3) is larger than the inner diameter of the flower plate sand mold (2). The flange sand mold (4) is a ring structure and is located on the inner circumference of the spraying top plate (3); The outer gating sleeve (5) is a ring structure, and the outer gating sleeve (5) is fastened to the upper surface of the flange sand mold (4); The inner mold (6) is located on the inner circumference of the outer sprue (5) of the spray top plate (3) and the flange sand mold (4). The inner mold (6) abuts against the flower plate sand mold (2) so that a preset cavity is formed between the spray bottom plate (1), the flower plate sand mold (2), the spray top plate (3), the flange sand mold (4), the outer sprue (5) and the inner mold (6).

2. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The upper surface of the flower disc sand mold (2) is provided with an upper annular recess (202), and the lower surface of the flower disc sand mold (2) is provided with a lower annular recess (203). The upper annular recess (202) and the lower annular recess (203) are connected by a number of evenly distributed perforations (201).

3. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The upper surface edge of the spraying base (1) is provided with a first annular protrusion (101), and the lower surface edge of the spraying top plate (3) is provided with a second annular protrusion (301). The inner diameter of the first annular protrusion (101) is equal to the inner diameter of the second annular protrusion (301), and the inner diameter of the first annular protrusion (101) is equal to the outer diameter of the flower plate sand mold (2).

4. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The upper inner circumference of the spraying top plate (3) is provided with an annular groove, the outer diameter of the flange sand mold (4) is the same as the inner diameter of the annular groove, and the flange sand mold (4) is located in the annular groove.

5. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The flange sand mold (4) has an annular groove at the upper end of its inner circumference, and the inner diameter of the outer casting sleeve (5) is smaller than the inner diameter of the annular groove.

6. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The lower surface edge of the outer gating sleeve (5) is provided with a third annular protrusion (501), the inner diameter of which is the same as the outer diameter of the flange sand mold (4).

7. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The outer circumference of the outer sprue (5) is chamfered at the top edge, and the top edge of the inner mold (6) is also chamfered.

8. The brake disc vertical centrifugal casting mold according to claim 1, characterized in that, The lower surface of the spraying chassis (1) is provided with a circular groove for connecting the reducer.

9. The brake disc vertical centrifugal casting mold according to any one of claims 1 to 8, characterized in that, The spraying base plate (1), the flower plate sand mold (2), the spraying top plate (3), the flange sand mold (4), the outer casting sleeve (5), and the inner mold (6) are arranged on the same straight line as the central axis.

10. The vertical centrifugal casting mold according to claim 9, characterized in that, The top of the inner mold (6) is provided with a threaded hole.

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