A metal backing plate and die-casting mold for reducing sand hole defects

Abstract

This utility model discloses a metal backing plate and a die-casting mold for reducing sand hole defects, addressing the technical problem that sand holes easily appear on the surface of threaded connecting posts on existing metal backing plates after die casting. The metal backing plate for reducing sand hole defects in this utility model includes a backing plate body and a plurality of threaded connecting posts protruding from the surface of the backing plate body. Each threaded connecting post has an extension portion at its end away from the backing plate body, and the extension portion communicates with the threaded connecting post. A drainage portion is provided at the root of each threaded connecting post.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, and in particular to a metal backing plate and die casting mold for reducing sand hole defects. Background Technology

[0002] Die casting is a metal casting process characterized by applying high pressure to molten metal within a mold cavity. The mold is typically made of a high-strength alloy, and the process is somewhat similar to injection molding. Most die-cast parts are iron-free, containing materials such as zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys and their alloys. Die-cast parts exhibit high dimensional accuracy and structural strength, as well as excellent mechanical properties.

[0003] In automobile manufacturing, the back panel of a car screen is generally produced using a die-casting process. A mold matching the shape of the back panel is designed, and molten metal is injected into the mold through a gating system to complete the production of the back panel. To connect with other parts, the back panel needs to be designed with multiple threaded connecting posts of a certain height. The mold cavity has recessed structures corresponding to the positions of these threaded connecting posts. During the actual die-casting process, the molten metal rapidly fills the cavity under high pressure. However, due to the unstable flow of the molten metal, difficulty in venting during the filling of these recessed structures can easily lead to sand holes (pores formed on or inside the casting due to gas or impurities) at the ends of the threaded connecting posts furthest from the back panel surface. When sand holes appear in the threaded connecting posts, their mechanical strength is greatly reduced, thus affecting the overall quality of the back panel.

[0004] Therefore, finding a technical solution that can solve the above-mentioned technical problems has become an important research topic for those skilled in the art. Utility Model Content

[0005] This utility model discloses a metal backing plate and a die-casting mold for reducing sand hole defects, which solves the technical problem that sand holes easily appear on the surface of the threaded connecting post on the metal backing plate after die casting.

[0006] This utility model provides a metal back plate for reducing sand hole defects, including a back plate body and a plurality of threaded connecting posts protruding from the surface of the back plate body, wherein the ends of the threaded connecting posts away from the back plate body are provided with extensions, and the extensions communicate with the threaded connecting posts.

[0007] A drainage section is provided at the root of the threaded connection post.

[0008] Optionally, the extension is a columnar structure coaxially arranged with the threaded connection post.

[0009] Optionally, the drainage portion is a triangular rib structure;

[0010] One side of the triangular rib structure is connected to the side of the threaded connecting post, and the bottom surface of the triangular rib structure is connected to the surface of the back plate body.

[0011] Optionally, the length of the columnar structure is 8mm to 10mm.

[0012] Optionally, the diameter of the cross-section of the columnar structure is 3mm to 5mm.

[0013] Optionally, the triangular rib structure has a first right-angled side and a second right-angled side arranged adjacent to each other, wherein the first right-angled side is connected to the side of the threaded connecting post, and the second right-angled side is connected to the surface of the back plate body.

[0014] Optionally, the length of the first right-angled side is 2.5mm to 3mm, and the length of the second right-angled side is 1.5mm to 1.8mm.

[0015] This utility model provides a die casting mold for die casting a metal back plate to reduce sand hole defects. The die casting mold includes a gating system and a cavity. The gating system is connected to the cavity and is used to fill the cavity with molten metal.

[0016] The cavity includes a plurality of first recessed structures for forming the threaded connecting post and the extension of the threaded connecting post, and a plurality of second recessed structures for forming the drainage portion, wherein the first recessed structures are connected to the second recessed structures.

[0017] Optionally, the gating system includes a main runner and multiple branch runners;

[0018] The first ends of the plurality of branch channels are connected to the main channel, and the second ends of the plurality of branch channels are connected to the cavity, wherein the second ends of some of the branch channels are disposed toward the first recessed structure and the second recessed structure.

[0019] Optionally, the cross-sectional area of ​​the first end of the diversion channel is smaller than the cross-sectional area of ​​the second end of the diversion channel.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this embodiment, the metal backing plate for reducing sand hole defects has an extension at the end of the threaded connecting post away from the backing plate body. Therefore, during the die-casting process, this extension provides venting and drainage. The extension can shift the location of sand holes from the end of the threaded connecting post away from the backing plate body to itself, thereby preventing sand holes from forming on the threaded connecting post and ensuring the compactness of the threaded connecting post. Furthermore, the drainage design can divert more molten metal during the die-casting process to the location of the threaded connecting post, thus enabling rapid forming of the threaded connecting post while improving venting efficiency and minimizing the formation of sand holes on the threaded connecting post. Attached Figure Description

[0022] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a metal backing plate for reducing sand hole defects provided by this utility model;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 A partial structural schematic diagram of a die-casting mold provided by this utility model;

[0026] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0027] Figure 5 A diagram illustrating the relationship between the gating system and the back plate body in a die-casting mold, provided by this utility model;

[0028] Illustration: Back plate body 1; Threaded connecting post 2; Extension 3; Drainage part 4; Die casting mold 5; Cavity 6; First recessed structure 7; Second recessed structure 8; Main channel 9; Branch channel 10; Branch channel 10a facing the threaded connecting post; Position of the threaded connecting post C. Detailed Implementation

[0029] This utility model discloses a metal backing plate and a die-casting mold for reducing sand hole defects, which solves the technical problem that sand holes easily appear on the surface of the threaded connecting post on the metal backing plate after die casting.

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1 to 5 The present invention provides a metal back plate for reducing sand hole defects, including a back plate body 1 and a plurality of threaded connecting posts 2 protruding from the surface of the back plate body 1, wherein the end of the threaded connecting post 2 away from the back plate body 1 is provided with an extension 3, and the extension 3 communicates with the threaded connecting post 2.

[0032] The root of the threaded connecting post 2 is provided with a drainage part 4.

[0033] In this embodiment, the metal backing plate for reducing sand hole defects has an extension 3 designed at the end of the threaded connecting post 2 away from the backing plate body 1. Therefore, during the die casting process, the extension 3 has a certain venting and drainage function. The extension 3 can transfer the formation position of sand holes from the end of the threaded connecting post 2 away from the backing plate body 1 to itself, thereby avoiding sand holes in the threaded connecting post 2 and ensuring the compactness of the threaded connecting post 2. In addition, the design of the drainage part 4 can guide more molten metal during the die casting process to the position of the threaded connecting post 2, thereby enabling the threaded connecting post 2 to be formed quickly while improving venting efficiency and minimizing the formation of sand holes on the threaded connecting post 2.

[0034] Furthermore, in this embodiment, the extension 3 is a columnar structure coaxially arranged with the threaded connecting post 2.

[0035] It should be noted that, based on the above design, it can be simply understood that the design of the extension 3 is equivalent to extending the threaded connecting post 2 to a certain extent.

[0036] Specifically, in this embodiment, the length of the columnar structure is 8mm to 10mm. In some specific embodiments, the length of the columnar structure can be 8mm, 9mm, 10mm, etc., and this embodiment does not impose any limitation on this. In addition, the diameter of the cross-section of the columnar structure in this embodiment is 3mm to 5mm. In some specific embodiments, the diameter of the cross-section of the columnar structure can be 3mm, 4mm, 5mm, etc., and this embodiment does not impose any limitation on this.

[0037] Furthermore, in this embodiment, the drainage section 4 is a triangular rib structure;

[0038] One side of the triangular rib structure is connected to the side of the threaded connecting post 2, and the bottom surface of the triangular rib structure is connected to the surface of the back plate body 1.

[0039] It should be noted that the specific shape of the drainage part 4 in this embodiment can be a triangular rib structure or other shapes, and this embodiment does not limit it.

[0040] Through the above design, the flow guide 4 can guide more molten metal during the die casting process to the position of the threaded connecting post 2, thereby enabling the threaded connecting post 2 to be formed quickly while improving the venting efficiency and minimizing the formation of sand holes on the threaded connecting post 2.

[0041] Specifically, the triangular rib structure in this embodiment has a first right-angled side and a second right-angled side arranged adjacent to each other, wherein the first right-angled side is connected to the side of the threaded connecting post 2, and the second right-angled side is connected to the surface of the back plate body 1.

[0042] In the above-mentioned triangular rib structure, the length of the first right-angled side is 2.5mm~3mm, and the length of the second right-angled side is 1.5mm~1.8mm.

[0043] Please see Figures 1 to 5 The present invention provides a die casting mold for die casting the aforementioned metal back plate for reducing sand hole defects. The die casting mold includes a gating system and a cavity 6. The gating system is connected to the cavity 6 and is used to fill the cavity 6 with molten metal.

[0044] The cavity 6 includes a plurality of first recessed structures 7 for molding the threaded connecting post 2 and the extension 3 connected to the threaded connecting post 2, and a plurality of second recessed structures 8 for molding the drainage part 4, wherein the first recessed structure 7 and the second recessed structure 8 are connected.

[0045] It should be noted that during the die-casting process, molten metal enters the cavity 6 through the gating system and flows into the first recessed structure 7 to form the threaded connecting post 2 and the extension 3. Simultaneously, the molten metal flows into the second recessed structure 8 to form the drainage section 4. The bottom end of the first recessed structure 7 has a certain venting and drainage function, which can transfer the formation location of sand holes from the end of the threaded connecting post 2 away from the back plate body 1 to the extension 3, thereby avoiding sand holes in the threaded connecting post 2 and ensuring the compactness of the forming of the threaded connecting post 2. In addition, the design of the second recessed structure 8 can guide more molten metal during the die-casting process to the position of the first recessed structure 7, thereby enabling the threaded connecting post 2 to be formed quickly while improving venting efficiency and minimizing the formation of sand holes on the threaded connecting post 2.

[0046] Furthermore, the gating system in this embodiment includes a main channel 9 and multiple branch channels 10;

[0047] The first ends of the plurality of branch channels 10 are connected to the main channel 9, and the second ends of the plurality of branch channels 10 are connected to the cavity 6, wherein the second ends of some of the branch channels 10 are disposed toward the first recessed structure 7 and the second recessed structure 8.

[0048] It should be noted that the above design can adjust the flow direction of the molten metal, allowing more molten metal to flow quickly toward the first recessed structure 7 and the second recessed structure 8, thereby increasing the forming rate of the threaded connecting column 2, improving the venting rate, and effectively reducing the formation of sand holes.

[0049] Furthermore, the cross-sectional area of ​​the first end of the diversion channel 10 is smaller than the cross-sectional area of ​​the second end of the diversion channel 10.

[0050] It should be noted that the above design makes the molten metal flowing into cavity 6 more smoothly, reducing the possibility of molten metal jetting.

[0051] In addition, it should be noted that after the metal back plate is formed, the extension 3 and the drainage part 4 need to be removed by CNC machining to leave the threaded connection post 2 without sand hole defects.

[0052] The above provides a detailed description of a metal backing plate and die-casting mold for reducing sand hole defects provided by this utility model. For those skilled in the art, based on the ideas of the embodiments of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A metal backing plate for reducing sand hole defects, characterized in that, It includes a back plate body (1) and a plurality of threaded connecting posts (2) protruding from the surface of the back plate body (1), wherein the end of the threaded connecting post (2) away from the back plate body (1) is provided with an extension (3), and the extension (3) communicates with the threaded connecting post (2). The root of the threaded connecting column (2) is provided with a drainage part (4).

2. The metal backing plate for reducing sand hole defects according to claim 1, characterized in that, The extension (3) is a columnar structure coaxially arranged with the threaded connecting post (2).

3. The metal backing plate for reducing sand hole defects according to claim 1, characterized in that, The drainage section (4) has a triangular rib structure; One side of the triangular rib structure is connected to the side of the threaded connecting post (2), and the bottom surface of the triangular rib structure is connected to the surface of the back plate body (1).

4. The metal backing plate for reducing sand hole defects according to claim 2, characterized in that, The length of the columnar structure is 8mm to 10mm.

5. The metal backing plate for reducing sand hole defects according to claim 4, characterized in that, The diameter of the cross-section of the columnar structure is 3mm to 5mm.

6. The metal backing plate for reducing sand hole defects according to claim 3, characterized in that, The triangular rib structure has a first right-angled side and a second right-angled side arranged adjacent to each other. The first right-angled side is connected to the side of the threaded connecting post (2), and the second right-angled side is connected to the surface of the back plate body (1).

7. The metal backing plate for reducing sand hole defects according to claim 6, characterized in that, The length of the first right-angled side is 2.5mm~3mm, and the length of the second right-angled side is 1.5mm~1.8mm.

8. A die-casting mold for die-casting a metal backing plate as described in any one of claims 1-7 for reducing sand hole defects, characterized in that, The die casting mold includes a gating system and a cavity (6), wherein the gating system is connected to the cavity (6) and is used to fill the cavity (6) with molten metal; The cavity (6) includes a plurality of first recessed structures (7) for molding the threaded connecting post (2) and the extension (3) connected to the threaded connecting post (2) and a plurality of second recessed structures (8) for molding the drainage part (4), wherein the first recessed structure (7) and the second recessed structure (8) are connected.

9. The die-casting mold according to claim 8, characterized in that, The gating system includes a main channel (9) and multiple branch channels (10). The first end of the plurality of branch channels (10) is connected to the main channel (9), and the second end of the plurality of branch channels (10) is connected to the cavity (6), wherein the second end of some of the branch channels (10) is disposed toward the first recessed structure (7) and the second recessed structure (8).

10. The die-casting mold according to claim 9, characterized in that, The cross-sectional area of ​​the first end of the diversion channel (10) is smaller than the cross-sectional area of ​​the second end of the diversion channel (10).

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