Die-casting die for metal bottom shell

Abstract

The utility model discloses a die-casting die of a metal bottom shell, which comprises an upper die plate, a lower die plate, an upper die core, a lower die core, a fixing plate, an ejector plate, an ejector and a rear die insert pin, the upper die core and the lower die core are oppositely arranged and form a cavity, one end of the rear die insert pin is fixed between the lower die core and the lower die plate, a plurality of counter bores are arranged on the lower die core, and the counter bores are arranged on the lower die plate. A plurality of rear mold insert pins correspond to the counter bores, a mounting hole is formed in the lower mold core, the other end of each rear mold insert pin penetrates through the mounting hole and then extends into the bottom of the corresponding counter bore, and the outer diameter of the other end of each rear mold insert pin is smaller than the inner diameter of the mounting hole. During die-casting forming, air at the position of the lower counter bore can be discharged downwards through a gap between the rear die insert pin and the mounting hole, so that air accumulation at the position of the lower counter bore is prevented, formation of bubbles at structures such as insertion columns formed at the position of the lower counter bore is avoided, and the product quality is guaranteed; meanwhile, air retention in the cavity can be greatly reduced, water marks on the surface of a product are reduced, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to a die-casting mold, and more particularly to a die-casting mold for a metal bottom shell. Background Technology

[0002] With the development of new energy vehicles, there are increasingly more styles of in-vehicle wireless chargers. However, the surface area of ​​the casing of a typical in-vehicle wireless charger is relatively large, requiring high processing precision. For the bottom shell of an in-vehicle wireless charger, due to its large surface area and the fact that the entire casing is assembled from a bottom shell and a top shell, multiple pins are formed on the inner side of the bottom shell. However, during die casting, it is difficult for air to escape quickly from the mold cavity, leading to gas accumulation in the pin-forming area. This easily causes air bubbles to form in the pin area, and when there is a large amount of residual gas in the mold cavity, it results in severe watermarks on the product surface, thus affecting product quality. Utility Model Content

[0003] The purpose of this utility model is to provide a die-casting mold for a metal bottom shell that can solve at least one of the above problems.

[0004] According to one aspect of this utility model, a die-casting mold for a metal base shell is provided, including an upper template, a lower template, an upper mold core, a lower mold core, a fixed plate, an ejector plate, ejector pins, and a rear mold insert. The upper template, lower template, and fixed plate are arranged sequentially from top to bottom. The upper mold core is fixed below the upper template, and the lower mold core is fixed above the lower template. The upper mold core and the lower mold core are arranged opposite to each other and form a cavity. The ejector plate is located inside the fixed plate. One end of the ejector pin is fixed to the ejector plate, and the other end can penetrate the lower template and the lower mold core and extend into the cavity. One end of the rear mold insert is fixed between the lower mold core and the lower template. The lower mold core is provided with multiple recessed holes, and the rear mold insert corresponds to multiple recessed holes. The lower mold core is provided with mounting holes. The other end of the rear mold insert penetrates the mounting hole and extends into the bottom of the recessed hole. The outer diameter of the other end of the rear mold insert is smaller than the inner diameter of the mounting hole.

[0005] The beneficial effects of this utility model are as follows: Since the outer diameter of the other end of the rear mold insert is smaller than the inner diameter of the mounting hole, during die casting, the air in the sinkhole can be discharged downward through the gap between the rear mold insert and the mounting hole, thereby preventing the accumulation of air in the sinkhole and avoiding the formation of air bubbles in the structure such as the inserted pillars formed in the sinkhole, thus ensuring product quality; at the same time, it can greatly reduce the amount of air trapped in the cavity, reduce the generation of water marks on the product surface, and improve product quality.

[0006] In some embodiments, the outer diameter of the other end of the rear mold insert is 0.02 mm smaller than the inner diameter of the mounting hole. This ensures proper air venting from the countersunk hole while preventing die-cast material from leaking out of the gap.

[0007] In some embodiments, the lower mold core is provided with a slag-filled cavity, which is connected to the mold cavity. An venting channel is provided on the outer side of the slag-filled cavity, located on the upper end face of the lower mold core. Therefore, by providing an venting channel, the air inside the mold cavity can be further facilitated to escape, effectively preventing the formation of watermarks on the product surface.

[0008] In some embodiments, the slag cavities are arranged in two rows. One row, closer to the mold cavity, has multiple slag cavities, while the other row has two slag cavities, which are respectively connected to the slag cavities at both ends of the first row. Thus, by providing corresponding slag cavities, excess material can be easily pressed into the slag cavities, facilitating the die-casting of the product.

[0009] In some embodiments, the venting channel includes a first channel and a second channel. There are two first channels, both of which are connected to the slag cavity, and the second channel is located between the two first channels. Thus, by providing multiple venting channels, the venting area can be increased, which is beneficial for the discharge of gas from the mold cavity.

[0010] In some embodiments, the die-casting mold for the metal base shell also includes a feeding pipe, a flow channel on the lower mold core that communicates with the cavity, and the feeding pipe passing through the upper mold plate and then downwards communicating with the flow channel. This facilitates the flow of die-casting material into the cavity.

[0011] In some embodiments, the die-casting mold for the metal base shell also includes guide pillars, which are sleeved on the ejector plate and fixed to the bottom end of the lower mold plate. Thus, the guide pillars guide the movement of the ejector plate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the die-casting mold for the metal base shell of this utility model in the closed state.

[0013] Figure 2 This is a cross-sectional structural schematic diagram of the die-casting mold for the metal bottom shell of this utility model.

[0014] Figure 3 This is a schematic diagram of the structure of the lower mold core in the die-casting mold of the metal bottom shell of this utility model.

[0015] Figure 4 This is a cross-sectional view of the lower mold core in the die-casting mold for the metal base shell of this utility model. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Reference Figures 1-4The die-casting mold for the metal base shell includes an upper mold plate 1, a lower mold plate 2, an upper mold core 3, a lower mold core 4, a fixing plate 5, an ejector plate 6, ejector pins 7, and a rear mold insert 8. The upper mold plate 1, lower mold plate 2, and fixing plate 5 are arranged sequentially from top to bottom. The upper mold core 3 is fixed below the upper mold plate 1, and the lower mold core 4 is fixed above the lower mold plate 2. The upper mold core 3 and lower mold core 4 are positioned opposite each other and form a cavity. The ejector plate 6 is located inside the fixing plate 5, and one end of the ejector pin 7 is fixed to the rear mold insert 8. On the needle plate 6, the other end can pass through the lower template 2 and the lower mold core 4 and extend into the cavity. One end of the rear mold insert 8 is fixed between the lower mold core 4 and the lower template 2. The lower mold core 4 is provided with multiple sinkholes 41. The rear mold insert 8 corresponds to multiple sinkholes 41. The lower mold core 4 is provided with mounting holes 42. The other end of the rear mold insert 8 passes through the mounting hole 42 and extends into the bottom of the sinkhole 41. The outer diameter of the other end of the rear mold insert 8 is smaller than the inner diameter of the mounting hole 42.

[0018] When using the die-casting mold for the metal base shell of this utility model, after the upper mold core 3 and the lower mold core 4 are engaged, water can be poured into the cavity. The mold then uses the fluid in the cavity to die-cast the metal, thereby obtaining the corresponding metal base shell. When the mold is closed during die casting, the air at the recessed hole 41 is forced into the gap between the rear mold insert pin 8 and the mounting hole 42, thus preventing air from accumulating at the recessed hole 41 and avoiding the formation of air holes at the insert pins on the metal base shell, ensuring product quality.

[0019] The outer diameter of the other end of the rear mold insert 8 is 0.02 mm smaller than the inner diameter of the mounting hole 42. Therefore, this gap ensures that air at the recessed hole 41 is forced out along the gap, while preventing the die-casting material from flowing out of the gap.

[0020] The lower mold core 4 has a slag-filled cavity 43, which is connected to the mold cavity. An exhaust channel 9 is located on the outer side of the slag-filled cavity 43, on the upper end face of the lower mold core 4. During die casting, excess material in the mold cavity is pressed into the slag-filled cavity 43, forming a slag-filled cavity. After the product is die-cast and demolded, the slag-filled cavity is removed, preventing excess material from remaining in the mold cavity. When the product is die-cast in the mold cavity, the exhaust channel 9 allows air in the cavity to be quickly discharged, preventing air from remaining in the cavity. This effectively controls watermarks on the surface of the die-cast product, improving product quality.

[0021] The slag-filled cavities 43 are arranged in two rows. One row of slag-filled cavities 43, closer to the mold cavity, has multiple slag-filled cavities 43, while the other row has two slag-filled cavities 43, which are respectively connected to the slag-filled cavities 43 at both ends of the first row. The first row of slag-filled cavities 43 is close to the mold cavity, while the second row is relatively far away from the mold cavity. The presence of the second row of slag-filled cavities 43 facilitates the accumulation of overflow material during die casting and also allows for the discharge of air from the mold cavity.

[0022] The exhaust channel 9 includes a first channel 91 and a second channel 92. There are two first channels 91, both of which are connected to the slag-filled cavity 43. The second channel 92 is located between the two first channels 91. The two first channels 91 can be connected to the two slag-filled cavities 43 in the second row, facilitating the rapid discharge of air from the mold cavity. By providing the first channel 91 and the second channel 92, the air discharge area is increased, facilitating the rapid discharge of air from the mold cavity, preventing air accumulation within the cavity, thereby reducing watermarks on the product surface and improving product quality.

[0023] The die-casting mold with a metal base shell also includes a feeding pipe 10. The lower mold core 4 is provided with a flow channel 44, which is connected to the cavity. The feeding pipe 10 passes through the upper mold plate 1 and connects downward to the flow channel 44. The feeding pipe 10 facilitates connection with an external material conveying structure and conveys the die-casting material into the flow channel 44, which then flows into the cavity.

[0024] The die-casting mold for the metal base shell also includes guide pillars 20, which are sleeved on the ejector plate 6 and fixed to the bottom end of the lower template 2. By providing guide pillars 20, the lifting and lowering of the ejector plate 6 can be guided, thereby facilitating the smooth lifting and lowering of the ejector plate 6.

[0025] The specific working process of the die-casting mold for the metal bottom shell of this utility model is as follows:

[0026] When the product needs to be die-cast, the upper mold plate 1 moves the upper mold core 3 to the lower mold plate 2 until the upper mold core 3 and the lower mold core 4 are engaged. After the upper mold core 3 and the lower mold core 4 are engaged, the mold is closed. Then, material is fed into the flow channel 44 through the feeding pipe 10, so that the flowing material fills the cavity and the die-casting of the product is completed in the cavity. When the product is being die-cast, the air in the sinker 41 is discharged through the gap between the rear mold insert pin 8 and the mounting hole 42; the gas in the cavity is discharged through the exhaust channel 9 and enters the exhaust chamber, so that the air in the cavity is discharged and the die-casting quality of the product is guaranteed.

[0027] After the product is die-cast, the mold is opened. The upper mold plate 1 drives the upper mold core 3 to move upward and away from the lower mold plate 2, so that the upper mold core 3 is separated from the product die-cast in the cavity. When the upper mold plate 1 moves into place, the ejector plate 6 moves upward and the ejector pin 7 moves upward with the ejector plate 6, so that the ejector pin 7 pushes the product out of the cavity, realizing the demolding of the product.

[0028] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A die-casting mold for a metal base shell, characterized in that, The mold includes an upper mold plate (1), a lower mold plate (2), an upper mold core (3), a lower mold core (4), a fixing plate (5), an ejector plate (6), ejector pins (7), and a rear mold insert (8). The upper mold plate (1), lower mold plate (2), and fixing plate (5) are arranged from top to bottom. The upper mold core (3) is fixed below the upper mold plate (1), and the lower mold core (4) is fixed above the lower mold plate (2). The upper mold core (3) and lower mold core (4) are arranged opposite to each other and form a cavity. The ejector plate (6) is located inside the fixing plate (5), and one end of the ejector pin (7) is fixed to the ejector plate (6). The other end of the rear mold insert (8) can penetrate the lower mold plate (2) and the lower mold core (4) and extend into the cavity. One end of the rear mold insert (8) is fixed between the lower mold core (4) and the lower mold plate (2). The lower mold core (4) is provided with multiple sinkholes (41). The rear mold insert (8) corresponds to multiple sinkholes (41). The lower mold core (4) is provided with mounting holes (42). The other end of the rear mold insert (8) penetrates the mounting hole (42) and extends into the bottom of the sinkhole (41). The outer diameter of the other end of the rear mold insert (8) is smaller than the inner diameter of the mounting hole (42).

2. The die-casting mold for the metal bottom shell according to claim 1, characterized in that, The outer diameter of the other end of the rear mold insert (8) is 0.02 mm smaller than the inner diameter of the mounting hole (42).

3. The die-casting mold for the metal bottom shell according to claim 2, characterized in that, The lower mold core (4) is provided with a slag-filled cavity (43), which is connected to the mold cavity. An exhaust channel (9) is provided on the outside of the slag-filled cavity (43), which is located on the upper end face of the lower mold core (4).

4. The die-casting mold for the metal bottom shell according to claim 3, characterized in that, The slag-encasing cavities (43) are arranged in two rows. One row of slag-encasing cavities (43) closer to the cavity side consists of multiple cavities, while the other row consists of two cavities, which are respectively connected to the slag-encasing cavities (43) at both ends of the previous row.

5. The die-casting mold for the metal bottom shell according to claim 4, characterized in that, The exhaust channel (9) includes a first channel (91) and a second channel (92). There are two first channels (91), both of which are connected to the slag chamber (43). The second channel (92) is located between the two first channels (91).

6. The die-casting mold for the metal bottom shell according to any one of claims 1 to 5, characterized in that, It also includes a feeding pipe (10), and the lower mold core (4) is provided with a flow channel (44), which is connected to the cavity. The feeding pipe (10) passes through the upper mold plate (1) and then connects downward to the flow channel (44).

7. The die-casting mold for the metal bottom shell according to any one of claims 1 to 5, characterized in that, It also includes a guide post (20), which is sleeved on the ejector plate (6) and fixed to the bottom end of the lower template (2).

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