Brake drum casting mold

Abstract

The utility model provides a brake drum casting mold. The brake drum casting mold comprises an upper mold, a lower mold and a filtering piece. The upper mold can form an upper cavity and a sprue, the lower mold can form a lower cavity, a filter cavity and a cross gate, the lower cavity is communicated with the filter cavity through the cross gate, the sprue is communicated with the filter cavity, the filter part is contained in the filter cavity, and the filter part can filter liquid casting materials. Impurities in a casting object are removed, a clean casting object is obtained, and the effect of slowing down the flow speed is achieved. The cross gate comprises a cross gate section and a fire inlet section, the cross gate section and the fire inlet section are communicated and arranged at an included angle, and when casting materials flow through the cross gate section and the fire inlet section, the flowing direction can be changed, the flowing speed of the casting materials can be reduced, and the influences of sand washing and the like of the casting materials on the sand tire are avoided. The thickness of the cross gate section is the same as that of the fire inlet section in the vertical direction, so that casting materials are prevented from being retained and condensed in the cross gate to cause waste of the casting materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of brake drum manufacturing, particularly relates to a brake drum casting mould. BACKGROUND

[0002] The brake drum is commonly known as brake drum, and is one of the more key parts in an automobile braking system, and it is a friction pair of a drum brake. When the brake drum is poor in quality, abnormal sound of the vehicle is caused, and even the driving safety of the vehicle is affected. Therefore, the brake drum should have the strength and rigidity required as a component, and the brake drum should also have high and stable wear resistance, heat resistance, heat dissipation and heat capacity, otherwise the use quality and service life of the automobile braking system are affected.

[0003] However, in the existing brake drum casting process, the usage amount of molten iron is too large during casting, and the quality problem of the cast brake drum is easily caused, so that the casting cost is high, thereby affecting the competitiveness of the product. UTILITY MODEL CONTENTS

[0004] The utility model discloses a brake drum casting mould, which can reduce the usage amount of molten iron and improve the yield of brake drum casting.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] According to one aspect of the utility model, the utility model provides a brake drum casting mould for casting a brake drum, which comprises: an upper mould capable of forming an upper cavity and a straight sprue; the straight sprue extends vertically; a lower mould capable of forming a lower cavity, a filtering cavity and a horizontal sprue; the horizontal sprue is communicated between the filtering cavity and the lower cavity; the upper cavity and the lower cavity can be aligned and communicated, and the bottom of the straight sprue can communicate with the filtering cavity; a filtering piece is accommodated in the filtering cavity and located at the bottom of the straight sprue, for filtering liquid casting material; wherein the horizontal sprue comprises a horizontal sprue section and a fire inlet section; the horizontal sprue section and the fire inlet section are connected and arranged at an angle, one side of the horizontal sprue section away from the fire inlet section is communicated with the side edge of the top of the filtering cavity, and one side of the fire inlet section away from the horizontal sprue section is communicated with the lower cavity; the horizontal sprue section and the fire inlet section are the same in vertical dimension and are located in the same horizontal plane.

[0007] In one embodiment of the present application, the vertical dimension of the horizontal sprue section is smaller than the width dimension of the horizontal sprue section in the horizontal direction; and the vertical dimension of the fire inlet section is smaller than the width dimension of the fire inlet section in the horizontal direction.

[0008] In one embodiment of this application, the length of the horizontal pouring section is equal to half the diameter of the straight pouring channel plus the sum of the redundant dimensions, and the redundant dimensions are 25mm-35mm.

[0009] In one embodiment of this application, the horizontal pouring section is arranged in an arc shape along its own length direction, and the central angle of the horizontal pouring section is an acute angle.

[0010] In one embodiment of this application, the width of the connection between the fire inlet section and the lower cavity is 150 mm.

[0011] In one embodiment of this application, the vertically projected area of ​​the filter element is greater than the vertically projected area of ​​the direct sprue.

[0012] In one embodiment of this application, the filter cavity is provided with a mounting portion for placing the filter element. The mounting portion is located at the top of the filter cavity, and when the filter element is placed on the mounting portion, the bottom of the filter element is spaced apart from the bottom of the filter cavity.

[0013] In one embodiment of this application, the brake drum casting mold further includes an upper sand mold and a lower sand mold; the upper mold can form the upper cavity and the sprue on the upper sand mold; the lower mold can form the lower cavity, the filter cavity and the sprue on the lower sand mold; wherein, a slag collection cavity is provided on the sprue; the slag collection cavity is located at the bottom of the sprue, so that when the upper sand mold is spliced ​​onto the lower sand mold, the slag collection cavity can communicate with the top of the filter element.

[0014] In one embodiment of this application, the upper mold is provided with a boss and a sprue rod, so that when the upper mold is casting in the upper sand mold, the boss and the sprue rod respectively form the upper cavity and the sprue; the lower mold is provided with a connected groove, a horizontal pouring section and a filter section, so that when the lower mold is casting in the lower sand mold, the groove forms the lower cavity, the horizontal pouring section forms the horizontal sprue, and the filter section forms the filter cavity.

[0015] In one embodiment of this application, the upper mold is provided with two bosses; the lower mold is provided with two grooves and two horizontal pouring sections, the two horizontal pouring sections are respectively connected to opposite sides of the filter section, and the grooves are connected to the filter section through the horizontal pouring sections.

[0016] As can be seen from the above technical solution, this utility model has at least the following advantages and positive effects:

[0017] In this invention, the brake drum casting mold includes an upper mold, a lower mold, and a filter element. The upper mold forms an upper cavity and a sprue on an upper sand mold, while the lower mold forms a lower cavity, a filter cavity, and a runner on a lower sand mold. The lower cavity and filter cavity are connected via the runner. The upper and lower cavities are aligned and connected, allowing the upper cavity and sprue to be cast into a brake drum during pouring. The bottom of the sprue connects to the filter cavity, where the filter element is housed. This allows the filter element to filter the liquid casting, removing impurities and producing a clean casting. It also slows down the flow rate, thereby improving the yield and output of the brake drum. Simultaneously, the runner includes a horizontal pouring section and a heat-injection section, which are connected and angled together. This allows the flow direction of the casting material to change as it passes through these sections, reducing the flow rate and preventing sand erosion on the sand mold. In addition, the horizontal pouring section and the quenching section have the same thickness in the vertical direction, which can prevent the casting from stagnating and agglomerating in the horizontal pouring channel, thus avoiding waste of casting and reducing the amount of casting used, thereby increasing the yield. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the upper mold of the brake drum casting mold according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the lower mold of the brake drum casting mold according to an embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of a brake drum formed by a brake drum casting mold according to an embodiment of the present invention.

[0021] Figure 4 yes Figure 3 Another schematic diagram of the brake drum.

[0022] Figure 5 This is a schematic diagram of the upper and lower sand molds of the brake drum casting mold according to an embodiment of the present invention.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1-Upper sand mold; 2-Lower sand mold; 3-Brake drum; 10-Upper mold; 11-Upper cavity; 12-Sprue; 13-Boss; 14-Sprue bar; 20-Lower mold; 21-Lower cavity; 22-Filter cavity; 23-Horizontal sprue; 24-Recessed section; 25-Horizontal sprue section; 26-Filter section; 30-Filter element; 121-Slag collection cavity; 141-Slag collection section; 221-Installation section; 222-Stepped section; 231-Horizontal sprue section; 232-Fire inlet section; 2311-Recessed side; 2312-Side edge. Detailed Implementation

[0025] Typical embodiments embodying the features and advantages of this utility model will be described in detail in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0026] In the description of this utility model, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications will also change accordingly.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In existing brake drum casting processes, excessive amounts of molten iron are used during casting, which easily leads to quality problems in the cast brake drums, resulting in high casting costs and affecting product competitiveness. Therefore, a brake drum casting mold is proposed to solve the above problems.

[0029] The solution is further illustrated by the following examples:

[0030] Figure 1 This is a schematic diagram of the upper mold of the brake drum casting mold according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the lower mold of the brake drum casting mold according to an embodiment of this utility model. Figure 3 This is a schematic diagram of a brake drum formed by a brake drum casting mold according to an embodiment of the present invention. Figure 4 yes Figure 3 Another schematic diagram of the brake drum. Figure 5 This is a schematic diagram of the upper and lower sand molds of the brake drum casting mold according to an embodiment of the present invention.

[0031] Please see Figure 1 , Figure 2 and Figure 5 The brake drum casting mold of this embodiment can be used to cast the brake drum 3 of an automobile.

[0032] Specifically, the brake drum casting mold may include an upper mold 10, a lower mold 20, a filter element 30, an upper sand mold 1, and a lower sand mold 2. The upper mold 10 and the lower mold 20 can be used for casting on the upper sand mold 1 and the lower sand mold 2, respectively, so that when the upper sand mold 1 is spliced ​​or overlapped onto the lower sand mold 2, a cavity that can be used for casting can be obtained.

[0033] Meanwhile, the upper mold 10 can form the upper cavity 11 and the sprue 12 on the upper sand mold 1, and the lower mold 20 can form the lower cavity 21, the filter cavity 22 and the sprue 23 on the lower sand mold 2.

[0034] In this embodiment, the upper mold 10 may be provided with a boss 13 and a sprue 14. When the upper mold 10 is casting in the upper sand mold 1, the boss 13 and the sprue 14 can respectively form an upper cavity 11 and a sprue 12 on the upper sand mold 1. The lower mold 20 may be provided with a connected groove 24, a horizontal gating section 25 and a filter section 26. When the lower mold 20 is casting in the lower sand mold 2, the groove 24 can form a lower cavity 21 on the lower sand mold 2, the horizontal gating section 25 can form a horizontal gating 23 on the lower sand mold 2, and the filter section 26 can form a filter cavity 22 on the lower sand mold 2. The horizontal gating 23 connects the lower cavity 21 and the filter cavity 22.

[0035] Meanwhile, when the upper sand mold 1 is spliced ​​or overlapped onto the lower sand mold 2, the bottom of the sprue 12 can connect to the filter chamber 22 on the lower sand mold 2, and the sprue 23 connects between the filter chamber 22 and the lower cavity 21, so that the liquid casting flows from the sprue 12 into the filter chamber 22, and from the filter chamber 22 along the sprue 23 into the lower cavity 21.

[0036] Furthermore, when the upper sand mold 1 is spliced ​​onto the lower sand mold 2, the upper cavity 11 and the lower cavity 21 can be aligned and connected, thereby allowing the upper cavity 11 and the lower cavity 21 to be spliced ​​into a mold cavity for casting the brake drum 3. That is, the liquid casting can flow from the horizontal sprue 23 into the lower cavity 21, and after filling the lower cavity 21, it fills into the upper cavity 11, thereby filling the mold cavity. After the casting cools and solidifies, it can form the brake drum 3.

[0037] It should be noted that the casting material can be a metallic material, such as iron, copper, aluminum, or other metal alloys. The casting material melts into a liquid state upon heating, allowing the liquid to fill the mold cavity, and after cooling, the corresponding casting is obtained. In this embodiment, the liquid casting material can be molten iron.

[0038] Furthermore, in this embodiment, the upper mold 10 is provided with two bosses 13, so that when the upper mold 10 is cast on the upper sand mold 1, the upper sand mold 1 can form two upper cavities 11. Simultaneously, the lower mold 20 is provided with two grooves 24 and two horizontal gating sections 25, and the two horizontal gating sections 25 are respectively connected to opposite sides of the filter section 26. The grooves 24 are connected to the filter section 26 through the horizontal gating sections 25. Therefore, when the lower mold 20 is cast on the lower sand mold 2, the lower sand mold 2 can form two lower cavities 21, one filter cavity 22, and two horizontal gating channels 23, and both lower cavities 21 are connected to the filter cavity 22 through the horizontal gating channels 23. Therefore, when the upper sand mold 1 is assembled onto the lower sand mold 2 and casting is performed, two brake drums 3 can be cast simultaneously.

[0039] In some other embodiments, the upper mold 10 may be provided with two or more bosses 13, and the lower mold 20 may be provided with two or more grooves 24 and horizontal pouring parts 25. At the same time, the number of bosses 13 and the number of grooves 24 are the same, the grooves 24 correspond one-to-one with the horizontal pouring parts 25, and are connected to the filter part 26, so that the mold can cast multiple brake drums 3 at the same time.

[0040] See Figure 5 The sprue 12 extends vertically to transport the liquid casting. In this embodiment, the top of the sprue 12 is funnel-shaped to facilitate the pouring of the liquid casting. The main body of the sprue 12 can be cylindrical to facilitate the pouring and flow of the liquid casting. Of course, in some other embodiments, the main body of the sprue 12 can also be rectangular to guide the flow of the liquid casting.

[0041] In this embodiment, the filter element 30 can be housed in the filter cavity 22 and located at the bottom of the sprue 12, so that the filter element 30 can be used to filter the liquid casting, thereby enabling the filter element 30 to filter impurities in the liquid casting, ensuring the cleanliness of the liquid casting, avoiding the impact of impurities on the casting, and thus improving the yield and output of the casting.

[0042] It should be noted that the vertical projection area of ​​the filter element 30 is larger than the vertical projection area of ​​the sprue 12, so that the filter element 30 can cover the end of the sprue 12 along the axial direction, thereby filtering the liquid casting in the sprue 12.

[0043] Of course, in some other embodiments, the vertically projected area of ​​the filter element 30 can be equal to the vertically projected area of ​​the sprue 12.

[0044] In this embodiment, the filter element 30 can be configured as a filter screen, filter, etc., so that the filter element 30 can filter impurities or scum in the liquid casting and ensure the cleanliness of the liquid casting flowing into the horizontal runner 23.

[0045] See Figure 3 and Figure 5 A slag collection cavity 121 is provided on the sprue 12. In this embodiment, a slag collection part 141 is provided on the sprue rod 14 so that when the upper mold 10 is casting on the upper sand mold 1, the slag collection part 141 can form a slag collection cavity 121, and the radial cross section of the slag collection cavity 121 is larger than the radial cross section of the main body of the sprue 12.

[0046] Specifically, the slag collection chamber 121 is located at the bottom of the sprue 12. When the upper sand mold 1 is attached to the lower sand mold 2, the slag collection chamber 121 can connect to the top of the filter element 30, that is, the slag collection chamber 121 is located at the top of the filter element 30. When the filter element 30 filters the liquid casting, the filter residue will remain at the top of the filter element 30, that is, accumulate in the slag collection chamber 121. It should be noted that since the radial cross-section of the slag collection chamber 121 is larger than the radial cross-section of the main body of the sprue 12, the accumulation of filter residue in the slag collection chamber 121 will not affect the flow rate of the liquid casting in the sprue 12.

[0047] In addition, the slag collection chamber 121 can be configured as a frustum-shaped chamber or a rectangular chamber, so that the slag collection chamber 121 can be used to collect filter slag.

[0048] In this embodiment, a mounting portion 221 may be provided inside the filter chamber 22. The mounting portion 221 can be used to place the filter element 30. Specifically, the mounting portion 221 is located at the top of the filter chamber 22. When the filter element 30 is placed in the mounting portion 221, the bottom of the filter element 30 is spaced apart from the bottom of the filter chamber 22, so that after the liquid casting is filtered by the filter element 30, it can flow into the filter chamber 22 and form a buffer, preventing the liquid casting from affecting the horizontal runner 23.

[0049] It should be noted that the cross-section of the mounting part 221 is larger than that of the sprue 12, so that after the filter element 30 is placed on the mounting part 221, the lower sand mold 2 can stably support the filter element 30, thereby enhancing the filter element 30's ability to bear liquid castings and preventing damage to the support position of the lower sand mold 2 when the liquid castings impact the filter element 30.

[0050] See Figure 2 and Figure 5 The filter chamber 22 is provided with a stepped section 222. The top of the stepped section 222 is connected to the horizontal runner 23. The vertical projection of the stepped section 222 does not intersect with the vertical projection of the filter element 30, and the vertical projection of the stepped section 222 is located on the outer periphery of the vertical projection of the filter element 30. This allows the liquid casting to fall into the bottom of the filter chamber 22 after being filtered by the filter element 30, and then flow along the stepped section 222 into the horizontal runner 23, thereby reducing the flow rate of the liquid casting.

[0051] See Figure 3 , Figure 4 and Figure 5 The horizontal pouring channel 23 may include a horizontal pouring section 231 and a fire-starting section 232.

[0052] The horizontal pouring section 231 and the ignition section 232 are connected and set at an angle, so that when the liquid casting flows from the horizontal pouring section 231 to the ignition section 232, the flow direction of the liquid casting can be changed and the flow velocity of the liquid casting in the horizontal pouring channel 23 can be reduced, so as to avoid the formation of sand scouring on the sand body when the flow velocity of the liquid casting is too high, thereby affecting the casting effect.

[0053] It should be noted that the cross-sectional area at the connection between the horizontal pouring section 231 and the ignition section 232 is larger than the cross-sectional area at the connection between the horizontal pouring section 231 and the filter chamber 22, and the ignition section 232 is connected to the side of the horizontal pouring section 231 in the width direction, thereby reducing the flow rate of the liquid casting in the horizontal pouring channel 23 and avoiding sand erosion.

[0054] In this embodiment, the side of the horizontal pouring section 231 away from the fire-inlet section 232 is connected to the side of the top of the filter chamber 22, so that after the liquid casting flows into the filter chamber 22, it overflows from the top of the filter chamber 22 along the horizontal pouring channel 23, thereby reducing the flow rate of the liquid casting and preventing the liquid casting from affecting the horizontal pouring channel 23, thus achieving the purpose of preventing sand erosion.

[0055] Meanwhile, the side of the inlet section 232 away from the horizontal pouring section 231 is connected to the lower cavity 21, allowing the molten casting to flow along the inlet section 232 into the lower cavity 21. It should be noted that the connection between the inlet section 232 and the lower cavity 21 can be located near the bottom of the lower cavity 21, so that after the molten casting enters the lower cavity 21, it fills the lower cavity 21 and the upper cavity 11 from bottom to top, ensuring that the molten casting fills the cavity evenly and that the gas inside the cavity is smoothly discharged to the outside, preventing porosity in the casting.

[0056] Furthermore, in this embodiment, the horizontal pouring section 231 and the annealing section 232 have the same vertical dimensions and are both located in the same horizontal plane, that is, the thickness of the horizontal pouring section 231 and the annealing section 232 is the same. This allows the liquid casting to flow at a uniform speed after entering the horizontal sprue 23, and avoids excessive accumulation of liquid casting in the horizontal sprue 23, which would cause waste of casting materials, thereby reducing casting costs and increasing casting yield.

[0057] See Figure 3 , Figure 4 and Figure 5The vertical dimension of the horizontal pouring section 231 is smaller than its horizontal width, and the vertical dimension of the ignition section 232 is smaller than its horizontal width. That is, both the horizontal pouring section 231 and the ignition section 232 are flat. This allows the liquid casting to flow from the filter chamber 22 to the horizontal pouring section 231 and the ignition section 232, thereby reducing the flow rate of the liquid casting and keeping the flow rate stable. This ensures that the liquid casting flows smoothly into the mold cavity, preventing the liquid casting from impacting the cavity wall, preventing the liquid casting from generating eddies and splashes in the mold cavity, and preventing the entrainment of gas. It also facilitates the discharge of air and other gases in the mold cavity, thereby preventing excessive oxidation of the liquid metal casting and preventing the casting from producing sand holes, cold spots, and porosity, thus enhancing the casting quality.

[0058] In this embodiment, the length of the horizontal gating section 231 is equal to half the diameter of the sprue 12 plus the sum of the redundant dimensions, with the redundant dimensions ranging from 25mm to 35mm. Specifically, the length of the horizontal gating section 231 is calculated as: L = 0.5D + (25~35) (mm), where L represents the length of the horizontal gating in mm, and D represents the diameter at the sprue inlet in mm. The redundant dimensions can be set according to actual production needs to reduce the flow rate of the liquid casting after entering the horizontal gating section 231, avoiding the risk of sand erosion, and controlling the flow rate of the liquid casting from the horizontal gating section 231 to the heat treatment section 232.

[0059] See Figure 3 The horizontal pouring section 231 can be set in an arc shape along its own length direction, and the central angle of the horizontal pouring section 231 is an acute angle.

[0060] Specifically, the arc-shaped horizontal pouring section 231 is concentrically arranged on the lower sand mold 2 and the lower cavity 21, that is, the concave side 2311 of the arc-shaped horizontal pouring section 231 faces the lower cavity 21, so that one end of the fire-starting section 232 is connected to the concave side 2311 of the horizontal pouring section 231, and the other end of the fire-starting section 232 is connected to the lower cavity 21, thereby allowing the liquid casting to flow smoothly along the horizontal pouring section 231 into the fire-starting section 232, reducing the flow rate of the liquid casting, and finally flowing into the lower cavity 21.

[0061] Of course, in some other embodiments, the concave side of the arc-shaped horizontal pouring section 231 can also face away from the lower cavity 21, that is, the convex side of the arc-shaped horizontal pouring section 231 is set towards the horizontal pouring section 231, and one end of the fire-starting section 232 is connected to the convex side of the horizontal pouring section 231, and the other end of the fire-starting section 232 is connected to the lower cavity 21, so that the liquid casting can flow smoothly along the horizontal pouring section 231 into the fire-starting section 232, and reduce the flow rate of the liquid casting, and finally flow into the lower cavity 21.

[0062] In other embodiments, the horizontal pouring section 231 can also be configured as a straight structure, and the fire-inlet section 232 is connected to both sides of the horizontal pouring section 231 in the width direction, thereby changing the flow direction and flow rate of the liquid casting and avoiding sand erosion.

[0063] Meanwhile, the central angle of the horizontal pouring section 231 is an acute angle, which allows the liquid casting to flow smoothly along the horizontal pouring section 231 and reduces its flow velocity. Specifically, the central angle of the horizontal pouring section 231 is between 20° and 30°.

[0064] In addition, the side 2312 of the horizontal pouring section 231 along its length is positioned toward the center of the lower cavity 21.

[0065] See Figure 3 The width of the connection between the fire-inlet section 232 and the lower cavity 21 is 150mm, and the interface at the connection between the fire-inlet section 232 and the lower cavity 21 is also flat, so that the liquid casting can flow smoothly into the lower cavity 21.

[0066] Specifically, in this embodiment, the cross-sectional area at the connection between the firing section 232 and the lower cavity 21 is set to S. 内 The cross-sectional area at the connection between the fire-in section 232 and the horizontal pouring section 231 is set to S. 横， And S 内 :S 横 =1:1, thus ensuring the smooth flow of the liquid casting within the fire-inlet section 232. Wherein, S 横 It can be 30% larger in cross-sectional area than the sprue 12, thereby ensuring that the liquid casting flows smoothly in the horizontal pouring section 231.

[0067] It should be noted that the interface between the inlet section 232 and the lower cavity 21 is flat, and the lower cavity 21 is connected to the gating section 231 through the inlet section 232. This allows the inlet section 232 to solidify rapidly after the liquid casting is filled, completely or substantially closing the heat exchange between the casting body and the gating system (i.e., the gating section 231, the filter chamber 22, and the sprue 12). This enables the casting body to solidify almost simultaneously. Furthermore, the thickness of the inlet section 232 is less than the wall thickness of the casting. After filling and cooling, the smaller and thinner areas cool first, thus eliminating the impact of heat concentration near the inlet on material properties and internal quality. For example, when the casting is gray iron, the reason why gray iron castings do not require shrinkage compensation is mainly because gray iron castings undergo graphitization expansion during solidification. This expansion can compensate for the volume shrinkage of the casting during solidification, thereby avoiding shrinkage cavities and porosity.

[0068] In summary, the upper mold 10 can form the upper cavity 11 and the sprue 12 on the upper sand mold 1, and the lower mold 20 can form the lower cavity 21, the filter cavity 22, and the runner 23 on the lower sand mold 2. The lower cavity 21 and the filter cavity 22 are connected through the runner 23. The upper cavity 11 and the lower cavity 21 can be aligned and connected so that the upper cavity 11 and the sprue 12 can be cast into the brake drum 3 during pouring. The bottom of the sprue 12 can be connected to the filter cavity 22, and the filter element 30 is housed in the filter cavity 22, so that the filter element 30 can filter the liquid casting to remove impurities and obtain a clean casting, and also slow down the flow rate, thereby improving the yield and output of the brake drum 3. Meanwhile, the horizontal runner 23 includes a horizontal pouring section 231 and a tempering section 232, which are connected and set at an angle. This allows the flow direction of the casting material to change as it passes through the horizontal pouring section 231 and the tempering section 232, thereby reducing the flow velocity of the casting and preventing the casting from causing sand erosion or other effects on the sand set. Furthermore, the horizontal pouring section 231 and the tempering section 232 have the same vertical thickness, which prevents the casting from stagnating and agglomerating within the horizontal runner 23, thus avoiding waste and reducing the amount of casting used, thereby increasing the yield.

[0069] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A brake drum casting mold for casting brake drums, characterized in that, The brake drum casting mold includes: The upper mold is capable of forming an upper cavity and a sprue; the sprue extends vertically. The lower mold is capable of forming a lower cavity, a filter cavity, and a sprue; the sprue connects the filter cavity and the lower cavity; the upper cavity and the lower cavity can be aligned and connected, and the bottom of the sprue can connect to the filter cavity; A filter element, which is housed within the filter chamber and located at the bottom of the sprue, is used to filter liquid castings. The horizontal pouring channel includes a horizontal pouring section and an inlet section; the horizontal pouring section and the inlet section are connected and arranged at an angle, the side of the horizontal pouring section away from the inlet section is connected to the side of the top of the filter chamber, and the side of the inlet section away from the horizontal pouring section is connected to the lower cavity; the horizontal pouring section and the inlet section have the same vertical dimensions and are both located in the same horizontal plane.

2. The brake drum casting mold according to claim 1, characterized in that, The vertical dimension of the horizontal pouring section is smaller than its horizontal width; the vertical dimension of the fire-inlet section is smaller than its horizontal width.

3. The brake drum casting mold according to claim 1, characterized in that, The length of the horizontal pouring section is equal to half the diameter of the vertical pouring channel plus the sum of the redundant dimensions, and the redundant dimensions are 25mm-35mm.

4. The brake drum casting mold according to claim 1, characterized in that, The horizontal pouring section is arc-shaped along its length, and the central angle of the horizontal pouring section is an acute angle.

5. The brake drum casting mold according to claim 1, characterized in that, The width of the connection between the fire inlet section and the lower cavity is 150mm.

6. The brake drum casting mold according to claim 1, characterized in that, The vertical projected area of ​​the filter element is greater than the vertical projected area of ​​the sprue.

7. The brake drum casting mold according to claim 1, characterized in that, The filter chamber is provided with a mounting part for placing the filter element. The mounting part is located at the top of the filter chamber, and when the filter element is placed in the mounting part, the bottom of the filter element is spaced apart from the bottom of the filter chamber.

8. The brake drum casting mold according to claim 1, characterized in that, It also includes an upper sand mold and a lower sand mold; the upper mold can form the upper cavity and the sprue on the upper sand mold; the lower mold can form the lower cavity, the filter cavity and the sprue on the lower sand mold; The direct casting channel is provided with a slag collection chamber; the slag collection chamber is located at the bottom of the direct casting channel so that when the upper sand mold is spliced ​​onto the lower sand mold, the slag collection chamber can communicate with the top of the filter element.

9. The brake drum casting mold according to claim 8, characterized in that, The upper mold is provided with a boss and a sprue rod, so that when the upper mold is casting in the upper sand mold, the boss and the sprue rod respectively form the upper cavity and the sprue; the lower mold is provided with a connected groove, a horizontal pouring section and a filter section, so that when the lower mold is casting in the lower sand mold, the groove forms the lower cavity, the horizontal pouring section forms the horizontal sprue and the filter section forms the filter cavity.

10. The brake drum casting mold according to claim 9, characterized in that, The upper mold is provided with two bosses; the lower mold is provided with two grooves and two horizontal pouring sections, the two horizontal pouring sections are respectively connected to the opposite sides of the filter section, and the grooves are connected to the filter section through the horizontal pouring sections.

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