Brake drum sand mold

Abstract

The utility model discloses a brake drum sand mould die, including lower mould and upper mould, the lower parting surface of lower mould is concave down and forms the lower mould cavity and forms the direct sprue nest, the riser nest and the inner runner of being located the lower mould cavity outside to the upward convex, the riser nest and the inner runner are connected with the lower mould cavity, the upper parting surface of upper mould is convex and forms the upper core and is located the upper direct sprue, the upper cross runner and the upper riser of the upper core outside, and the upper riser is connected with the upper core, the upper cross runner has the first section of being close to the upper direct sprue, the second section of being away from the upper direct sprue relative to the first section, and the connecting section between the first section and the second section, and the both ends of connecting section are respectively connected with the first section and the second section, and the cross section area of connecting section is less than the cross section area of the first section and the second section, can reduce the molten iron flow rate in sand mould cross runner, prevents the sand hole of castings and improves the castings yield.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, specifically to a brake drum sand mold. Background Technology

[0002] A brake drum sand mold is used to form a sand mold, which is then used to cast the brake drum (casting). Existing brake drum molds include an upper mold and a lower mold. The lower mold has a lower cavity formed on its lower parting surface, along with a sprue recess and a riser recess located outside the lower cavity. The riser recess is connected to the lower cavity. The upper mold has an upper core, an upper sprue, and an upper riser formed on its lower parting surface corresponding to the lower cavity, sprue recess, and riser recess, respectively. The upper riser is connected to the upper core. However, brake drums cast from sand molds formed using the above-mentioned brake drum sand molds are prone to sand holes, resulting in defective castings. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a brake drum sand mold that reduces the flow rate of molten iron in the sand mold's horizontal runner by setting the cross-sectional area of ​​the connecting section of the upper horizontal runner to be smaller than the cross-sectional areas of the first and second sections, thereby preventing sand holes in the casting.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: A brake drum sand mold, comprising a lower mold and an upper mold corresponding to the lower mold; The lower parting surface of the lower mold is recessed downward to form a lower cavity and protrudes upward to form a sprue recess, a riser recess, and an ingate located outside the lower cavity. The riser recess and the ingate are connected to the lower cavity. The upper parting surface of the upper mold protrudes upward to form an upper core and an upper sprue, an upper runner, and an upper riser located outside the upper core. The upper core, the upper sprue, the upper runner, and the upper riser correspond to the lower cavity, the sprue recess, the ingate, and the riser recess, respectively. The upper riser is connected to the upper core. The upper runner has a first section close to the upper sprue, a second section away from the upper sprue relative to the first section, and a connecting section located between the first section and the second section. The two ends of the connecting section are connected to the first section and the second section, respectively, and the cross-sectional area of ​​the connecting section is smaller than the cross-sectional area of ​​the first section and the second section.

[0005] Furthermore, the height of the cross-section of the connecting segment is less than the height of the cross-sections of the first segment and the second segment.

[0006] Furthermore, the height of the second cross section is less than the height of the first cross section, and the width of the second cross section is less than the width of the first cross section, and the width of the connecting section cross section is less than or equal to the width of the second cross section.

[0007] Furthermore, there are multiple lower cavities, which are distributed along the length of the lower mold; there are multiple upper cores, with one upper core corresponding to one lower cavity; the upper horizontal runner includes a main runner located between the upper sprue and the upper core; the main runner forms the first section, and its connection end away from the upper sprue is connected to a branch runner for each upper core; the branch runner forms the second section and extends radially along the upper core.

[0008] Furthermore, two adjacent upper cores form a core group, each core group has a main channel, each main channel is provided with two branch channels, and each branch channel is provided with a connecting section between the connecting end and the connecting end, with the two ends of the connecting section respectively connected to the connecting end and the branch channel.

[0009] Furthermore, each of the upper cores has a first side and a second side, the second side being away from the upper sprue relative to the first side, and two adjacent upper cores form a core group. In each core group, one of the two upper cores near the upper sprue has an upper riser on the second side, and the other of the two upper cores has another upper riser on the first side. The runner extends in the direction close to the upper riser.

[0010] Furthermore, the lower parting surface has two filter screen seats protruding upwards on opposite sides of the sprue recess. The two filter screen seats are arranged along the length direction of the lower mold. The lower parting surface protrudes upwards at the end of each filter screen seat away from the sprue to form a lower sprue. The lower sprue is connected to the filter screen seat and its projection in the vertical direction intersects with the projection of the main sprue of the corresponding upper sprue.

[0011] Furthermore, there are multiple ingates, which are evenly distributed around the lower cavity. In the vertical direction, the projection of the upper runner intersects with the projection of the multiple ingates. The top surface of the upper core protrudes upward to form multiple flattened risers, which are evenly distributed around the upper core.

[0012] This invention relates to a brake drum sand mold. By incorporating a connecting section located between the first and second sections, with both ends of the connecting section connecting to the first and second sections respectively, and the cross-sectional area of ​​the connecting section being smaller than that of the first and second sections, the flow rate of molten iron in the horizontal runner of the sand mold can be reduced, preventing sand holes in the casting and improving the casting yield. This invention also features good feeding effect and a simple structure. Attached Figure Description

[0013] Figure 1This is a three-dimensional schematic diagram of the upper mold of the brake drum sand mold according to an embodiment of the present utility model; Figure 2 for Figure 1 A magnified view of part A; Figure 3 This is a three-dimensional schematic diagram of the lower mold of the brake drum sand mold according to an embodiment of the present utility model. Detailed Implementation

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figures 1 to 3 As shown, this utility model embodiment provides a brake drum sand mold for forming a sand mold (not shown), which is used to cast a casting (brake drum), including a lower mold 1 and an upper mold 2 corresponding to the lower mold 1.

[0015] The lower mold 1 is used to form the lower sand mold (not shown), and its lower parting surface 10 is recessed downward to form a lower cavity 11 and protrudes upward to form a sprue recess 12, a riser recess 13, and an ingate 14 located outside the lower cavity 11. There are multiple lower cavities 11, which are evenly distributed along the length of the lower mold 1. In this embodiment, there are four lower cavities 11, which are arranged along the length of the lower mold 1. The riser recess 13 and the ingate 14 are connected to the lower cavity 11. There are multiple ingates 14, which are evenly distributed along the circumference of the lower cavity 11. Specifically, there are four ingates 14, which are all located on the same side of the lower cavity 11.

[0016] The upper parting surface 21 of the upper mold 2 protrudes upward to form an upper core 22 and an upper sprue 23, an upper horizontal sprue 24 and an upper riser 25 located outside the upper core 22. The upper core 22, upper sprue 23, upper horizontal sprue 24 and upper riser 25 correspond to the lower cavity 11, sprue recess 12, ingate 14 and riser recess 13 respectively and are integrally formed. There are multiple upper cores 22. In this embodiment, there are 4 upper cores 22. One upper core 22 corresponds to a lower cavity 11. Two adjacent upper cores 22 form a core group 220. Each upper core 22 has a first side 221 and a second side 222. The second side 222 is farther away from the upper sprue 23 relative to the first side 221.

[0017] The upper horizontal sprue 24 has a first section 241 close to the upper sprue 23, a second section 242 away from the upper sprue 23 relative to the first section 241, and a connecting section 243 located between the first section 241 and the second section 242. The two ends of the connecting section 243 are respectively connected to the first section 241 and the second section 242. The cross-sectional area of ​​the connecting section 243 is smaller than that of the first section 241 and the second section 242 to reduce the flow rate of molten iron in the sand mold horizontal sprue, prevent sand porosity in the casting, improve casting yield, and has a simple structure. In this embodiment, the height of the connecting section 243's cross-section is smaller than the height of the first section 241 and the second section 242's cross-section; that is, the connecting section 243 reduces its cross-sectional area by reducing its height. Of course, in other embodiments, the connecting section 243 can also reduce its cross-sectional area by reducing its width. The specific structure can be selected according to actual needs. To further prevent sand holes in the casting, specifically, the height of the cross-section of the second segment 242 is less than the height of the cross-section of the first segment 241, and the width of the cross-section of the second segment 242 is less than the width of the cross-section of the first segment 241. The width of the cross-section of the connecting segment 243 is less than or equal to the width of the cross-section of the second segment 242. In this embodiment, the width of the cross-section of the connecting segment 243 is equal to the width of the cross-section of the second segment 242.

[0018] Specifically, the upper runner 24 includes a main runner located between the upper sprue 23 and the upper core 22. The main runner forms a first segment 241, and its connecting end away from the upper sprue 23 is connected to a branch runner for each upper core 22. The branch runner forms a second segment 242 and extends radially along the upper core 22. In the vertical direction, the projection of the branch runner intersects with the projection of the plurality of ingates 14. More specifically, two adjacent upper cores 22 form a core group 220. Each core group 220 has a main runner, each main runner has two branch runners, and each branch runner has a connecting segment 243 between it and the connecting end. The two ends of the connecting segment 243 are respectively connected to the connecting end and the branch runner.

[0019] The upper riser 25 is connected to the upper core 22. To improve the feeding effect, specifically, one of the two upper cores 22 in each core group 220, near the upper sprue 23, has an upper riser 25 on the second side 222, and the other of the two upper cores 22 has another upper riser 25 on the first side 221. That is, the upper riser 25 is a side riser to feed the lower half of the casting. Correspondingly, the runner extends along the direction close to the upper riser 25. To further improve the feeding effect, multiple flattened risers 223 are formed by protruding upward on the top surface of the upper core 22. The multiple flattened risers 223 are evenly distributed along the circumference of the upper core 22 to feed the top flange of the casting and prevent shrinkage porosity and shrinkage holes in the casting.

[0020] The lower parting surface 10 has two filter screen seats 15 protruding upwards on opposite sides of the sprue recess 12. The two filter screen seats 15 are arranged along the length of the lower mold 1. At the end of each filter screen seat 15 furthest from the sprue, the lower parting surface 10 protrudes upwards to form a lower sprue 16. The lower sprue 16 is connected to the filter screen seat 15, and its projection in the vertical direction intersects with the projection of the main channel of its corresponding upper sprue 24. By setting the filter screen seats 15, impurities in the molten iron can be filtered during the casting process, thereby improving the quality of the casting.

[0021] This invention relates to a brake drum sand mold. By incorporating a connecting section located between the first and second sections, with both ends of the connecting section connecting to the first and second sections respectively, and the cross-sectional area of ​​the connecting section being smaller than that of the first and second sections, the flow rate of molten iron in the horizontal runner of the sand mold can be reduced, preventing sand holes in the casting and improving the casting yield. This invention also features good feeding effect and a simple structure.

[0022] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A brake drum sand mold, characterized in that, This includes the lower mold and the corresponding upper mold; The lower parting surface of the lower mold is recessed downward to form a lower cavity and protrudes upward to form a sprue recess, a riser recess, and an ingate located outside the lower cavity. The riser recess and the ingate are connected to the lower cavity. The upper parting surface of the upper mold protrudes upward to form an upper core and an upper sprue, an upper runner, and an upper riser located outside the upper core. The upper core, the upper sprue, the upper runner, and the upper riser correspond to the lower cavity, the sprue recess, the ingate, and the riser recess, respectively. The upper riser is connected to the upper core. The upper runner has a first section close to the upper sprue, a second section away from the upper sprue relative to the first section, and a connecting section located between the first section and the second section. The two ends of the connecting section are connected to the first section and the second section, respectively, and the cross-sectional area of ​​the connecting section is smaller than the cross-sectional area of ​​the first section and the second section.

2. The brake drum sand mold as described in claim 1, characterized in that, The height of the cross-section of the connecting segment is less than the height of the cross-sections of the first segment and the second segment.

3. The brake drum sand mold as described in claim 1, characterized in that, The height of the second cross section is less than the height of the first cross section, and the width of the second cross section is less than the width of the first cross section. The width of the connecting section cross section is less than or equal to the width of the second cross section.

4. The brake drum sand mold as described in claim 1, characterized in that, The lower mold cavity is provided in multiple ways, and the multiple lower mold cavities are distributed along the length direction of the lower mold. The upper mold core is provided in multiple ways, and one upper mold core corresponds to one lower mold cavity. The upper horizontal runner includes a main runner located between the upper sprue and the upper mold core. The main runner forms the first section, and its connection end away from the upper sprue is connected to a branch runner for each upper mold core. The branch runner forms the second section and extends radially along the upper mold core.

5. The brake drum sand mold as described in claim 4, characterized in that, Two adjacent upper cores form a core group. Each core group has a main channel. Each main channel has two branch channels. Each branch channel is connected to the connecting end by a connecting section. The two ends of the connecting section are respectively connected to the connecting end and the branch channel.

6. The brake drum sand mold as described in claim 4, characterized in that, Each of the upper cores has a first side and a second side, the second side being away from the upper sprue relative to the first side. Two adjacent upper cores form a core group. In each core group, one of the two upper cores near the upper sprue has an upper riser on the second side, and the other of the two upper cores has another upper riser on the first side. The runner extends in the direction close to the upper riser.

7. The brake drum sand mold as described in claim 1, characterized in that, The lower parting surface has two filter screen seats protruding upwards on opposite sides of the sprue recess. The two filter screen seats are arranged along the length of the lower mold. The lower parting surface protrudes upwards at the end of each filter screen seat away from the sprue to form a lower sprue. The lower sprue is connected to the filter screen seat and its projection in the vertical direction intersects with the projection of the main sprue of the corresponding upper sprue.

8. The brake drum sand mold as described in claim 1, characterized in that, There are multiple ingates, which are evenly distributed around the lower cavity. In the vertical direction, the projection of the upper runner intersects with the projection of the multiple ingates. The top surface of the upper core protrudes upward to form multiple flattened risers, which are evenly distributed around the upper core.

Images