Shell die-casting die

Abstract

The shell die-casting die is characterized in that the shell die-casting die comprises a die-casting die body and a casting system, the die-casting die body comprises a movable die body and a fixed die body which are oppositely arranged, the movable die body comprises a movable die body bottom plate, a movable die body frame and a movable die body core, the fixed die body comprises a fixed die body frame and a fixed die body core, and a shell cavity is formed between the movable die body core and the fixed die body core; the fixed mold core is provided with a protruding fixed mold insert used for forming an inner cavity of the shell, and the parting surface of the fixed mold core and the parting surface of the movable mold core deviate from the open end of the shell by a preset distance. The casting system comprises a material cake, a straight pouring channel, a transverse pouring channel, a branch transverse pouring channel, an inner pouring gate, a shell casting, a cinder ladle and a vacuum air suction channel which are sequentially connected. The casting system has the beneficial effects that the mold structure is simple, the casting system layout is reasonable, no air hole exists in the position of a sealing groove in the opening edge of a shell by changing the pouring position, and the sealing effect is good; and the large-wall-thickness position is filled at a special angle and a low speed, wrapping is avoided, and the overall quality of a shell casting is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of die-casting dies, and in particular to a shell die-casting die. Background Art

[0002] With the rapid development of new energy vehicles, high-voltage electronic control systems (such as battery management systems, motor controllers, and DC-DC converters) are core components, and performance requirements for their housings are increasing. High-voltage module housings must exhibit high sealing, excellent heat dissipation, lightweight construction, and electromagnetic shielding capabilities, while also withstanding mechanical shock and environmental corrosion under complex operating conditions. Currently, these housings are mostly manufactured using aluminum alloy die-casting, which offers high production efficiency, manageable costs, and meets lightweight requirements.

[0003] However, the existing high-voltage module housings of new energy vehicles are mainly formed by aluminum alloy die-casting and then machined to obtain products. However, the high-voltage module housings usually integrate multiple sets of heat dissipation ribs, mounting holes and sealing grooves. The runner design of traditional molds can easily lead to uneven filling of molten metal, causing defects such as air holes and cold shuts, affecting the air tightness of the housing. In addition, the four corners of the existing housing are at locations with large wall thicknesses, and the existing casting system is prone to wrapping at the wall thickness locations, thereby affecting the mechanical strength. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a shell die-casting mold, which solves the problem of air holes in the sealing port and the problem of wrapping in the area with large wall thickness.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A shell die-casting mold, characterized in that it includes a die-casting mold and a casting system,

[0007] The die-casting mold includes a movable mold and a fixed mold arranged opposite to each other, wherein the movable mold includes a movable mold base, a movable mold frame, and a movable mold core, and the fixed mold includes a fixed mold frame and a fixed mold core. A shell cavity is defined between the movable mold core and the fixed mold core, and the fixed mold core has a protruding fixed mold insert for forming the inner cavity of the shell. The parting surface between the fixed mold core and the movable mold core deviates from the open end of the shell by a predetermined distance.

[0008] The casting system includes a material cake, a straight runner, a cross runner, a branch cross runner, an inner gate, a shell casting, a slag bag, and a vacuum exhaust channel connected in sequence, wherein the cross runner includes a first cross runner and a second cross runner arranged symmetrically on the left and right sides, the first cross runner and the second cross runner are both connected to two first branch cross runners corresponding to the front end face of the shell casting, the first cross runner is connected to two second branch cross runners corresponding to the left end face of the shell casting, the second cross runner is connected to two third branch cross runners corresponding to the right end face of the shell casting, and the shell casting One end of the part is open, and a sealing groove is provided along the end face of the open mouth. The connection positions of the inner gate and the shell casting are higher than the height of the sealing groove. The four corners of the shell casting have wall thickness parts, and the inner gate deviates from the wall thickness part by a predetermined distance. The rear end face of the shell casting is provided with a plurality of first slag bags, and the left end face and the right end face of the shell casting are provided with a plurality of second slag bags, the first slag bags and the second slag bags are connected to the vacuum exhaust duct, and the shell casting has a plurality of mounting lugs and connection ports, and each of the mounting lugs and connection ports is connected to a third slag bag.

[0009] Furthermore, it also includes a cooling system, which includes a plurality of spot cooling tubes arranged in the fixed mold insert, and the cooling height of the spot cooling tubes is a predetermined distance from the top surface of the fixed mold insert.

[0010] Furthermore, the first slag bag and the second slag bag are located on the fixed mold core, the third slag bag is located on the movable mold core, and the third slag bag located at the rear of the shell casting is connected to the vacuum exhaust duct.

[0011] Furthermore, the connection positions of the first slag bag and the second slag bag with the shell casting are both higher than the height of the sealing groove.

[0012] Furthermore, the thick wall portion at the front end in the filling direction is connected to a fourth slag bag, and the fourth slag bag is located in front of the shell casting.

[0013] The beneficial effects of the present invention include: a simple mold structure, a reasonable layout of the casting system, and by changing the pouring position, there is no air hole in the sealing groove position of the shell edge. The thick wall position is filled at a special angle and a slower speed to avoid wrapping, which significantly improves the overall quality of the shell casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the mold structure of the present invention;

[0015] Figure 2 It is a schematic structural diagram of the casting system of the present invention;

[0016] Figure 3 It is a schematic structural diagram of the casting system of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] A shell die-casting mold, including a die-casting mold and a casting system, such as Figure 1 As shown, the die-casting mold includes a movable mold and a fixed mold arranged relative to each other, wherein the movable mold includes a movable mold base plate 9, a movable mold frame 10, and a movable mold core 11. The movable mold base plate 9 is arranged behind the movable mold frame 10, and the movable mold core 11 is embedded in the movable mold frame 10. The fixed mold includes a fixed mold frame 12 and a fixed mold core 13, and the fixed mold core 13 is embedded in the fixed mold frame 12. A shell cavity is defined between the movable mold core 11 and the fixed mold core 13, and a protruding fixed mold insert 14 is provided on the fixed mold core 13 to form the inner cavity of the shell. The parting surface between the fixed mold core 13 and the movable mold core 11 deviates from the open end of the shell by a predetermined distance, so that the pouring position of the shell deviates from the sealing groove on the shell. The die casting also includes a cooling system, which includes a plurality of spot cooling tubes 15 arranged in the fixed die insert 14. The cooling height of the spot cooling tubes 15 is a predetermined distance from the top surface of the fixed die insert 14. Therefore, the cooling system does not cool the top of the fixed die insert, but only cools the bottom of the fixed die insert. This structure allows the mold temperature at the top of the fixed die insert to rise quickly, and the bottom sealing ring position can avoid shrinkage holes.

[0019] like Figure 2-3 The casting system shown includes a material cake 1, a straight runner 2, a cross runner 3, a branch cross runner 4, an inner gate 5, a shell casting 6, a slag bag 7, and a vacuum exhaust channel 8, which are connected in sequence. The cross runner 3 includes a first cross runner 31 and a second cross runner 32 that are symmetrically arranged on the left and right. The first cross runner 31 and the second cross runner 32 are both connected to two first branch cross runners 41 corresponding to the front end faces of the shell casting 6. The four branch cross runners allow the shell to be poured from the front end face. The first cross runner 31 is also connected to two second branch cross runners 42 corresponding to the left end face of the shell casting 6, and the second cross runner 32 is connected to two third branch cross runners 43 corresponding to the right end face of the shell casting 6. Pouring from multiple directions allows the shell casting 6 to be quickly filled and formed, which can reduce the flow distance of the molten metal.

[0020] One end of the shell casting 6 is open, and a sealing groove 61 is provided on the end face of the opening. In order to reduce the pores at the position of the sealing groove 61, the connection position of the inner gate 5 and the shell casting 6 in this embodiment is higher than the height of the sealing groove, so as to avoid the formation of small pores after the sealing ring groove is offset, thereby preventing the small pores from gathering at the sealing ring.

[0021] like Figure 3The four corners of the housing casting 6 are provided with thick wall portions 62, which are used to accommodate threaded mounting holes. These portions are machined in subsequent steps and therefore require sufficient mechanical strength. To prevent wrapping in these thick wall portions, this embodiment places the ingates 5 at a predetermined distance and angle from these thick wall portions, allowing the molten metal to initially fill the housing sidewalls. In this embodiment, the molten metal fills at a speed exceeding 30 m / s, allowing the molten metal to enter the thick wall cavity in an atomized form, gradually filling the cavity and ensuring consistent molding quality.

[0022] Furthermore, the rear end face of the shell casting 6 is provided with multiple first slag ladles 71, and the left and right end faces of the shell casting 6 are provided with multiple second slag ladles 72. The first and second slag ladles 71, 72 are connected to the vacuum exhaust duct 8. Vacuum exhaust can quickly fill the mold cavity, reduce the mold cavity pressure, and reduce the probability of air holes and air rolls forming in the shell. The shell casting 6 has multiple mounting lugs 63 and connection ports 64, each of which is connected to a third slag ladle 73. This third slag ladle 73 collects the cooling scum of the molten metal flowing through the mounting lugs 63 and connection ports 64, allowing residual gas to be pushed out of the third slag ladle 73, thereby improving the quality of the die casting.

[0023] Since the front thick wall portion 62 is connected to the fourth slag ladle 74, which is arranged in front of the thick wall portion 62, the thick wall portion 62 is poured by the first branch runner 41, which deviates by a predetermined distance and deflects by a predetermined angle, thereby forming a C-shaped filling path. When the molten metal enters the thick wall portion cavity in an atomized state and gradually fills the thick wall portion cavity, the poor molten metal at the front end flows into the fourth slag ladle 74 and is collected. Similarly, the thick wall portion 62 at the rear of the shell casting 6 is poured by the second branch runner 42 or the third branch runner 43 on the side. The thick wall portion 62 at this location is also connected to the first slag ladle 71 and the second slag ladle 72, thereby improving the stability of the molding quality and making the local mechanical strength high.

[0024] To facilitate mold opening, the first slag bag 71 and the second slag bag 72 of this embodiment are located on the fixed mold core 13, and the third slag bag 73 is located on the movable mold core 11. The third slag bag 73 located at the rear of the shell casting 6 is connected to the vacuum exhaust duct 8.

[0025] Similar to the gate position, the connection positions of the first slag bag 71 and the second slag bag 72 with the shell casting 6 are both higher than the height of the sealing groove to avoid the formation of air holes at the sealing groove position.

[0026] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A housing die-casting mold, characterized in that: Including die casting molds and casting systems, The die-casting mold comprises a movable mold and a fixed mold arranged relatively to each other, wherein the movable mold comprises a movable mold base plate (9), a movable mold frame (10), and a movable mold core (11); the fixed mold comprises a fixed mold frame (12) and a fixed mold core (13); a shell cavity is provided between the movable mold core (11) and the fixed mold core (13); a protruding fixed mold insert (14) is provided on the fixed mold core (13) for forming the inner cavity of the shell; and a parting surface between the fixed mold core (13) and the movable mold core (11) deviates from the open end of the shell by a predetermined distance; The casting system includes a material cake (1), a straight runner (2), a cross runner (3), a branch cross runner (4), an inner gate (5), a shell casting (6), a slag bag (7), and a vacuum exhaust channel (8) connected in sequence, wherein the cross runner (3) includes a first cross runner (31) and a second cross runner (32) arranged symmetrically on the left and right, the first cross runner (31) and the second cross runner (32) are both connected to two first branch cross runners (41) corresponding to the front end face of the shell casting (6), the first cross runner (31) is connected to two second branch cross runners (42) corresponding to the left end face of the shell casting (6), the second cross runner (32) is connected to two third branch cross runners (43) corresponding to the right end face of the shell casting (6), the shell casting ( 6) One end is open, and the end surface of the open mouth is provided with a sealing groove (61), the connection position of the inner gate (5) and the shell casting (6) is higher than the height of the sealing groove, the four corners of the shell casting (6) are provided with a wall thickness portion (62), and the inner gate (5) deviates from the wall thickness portion (62) by a predetermined distance, the rear end surface of the shell casting (6) is provided with a plurality of first slag bags (71), the left end surface and the right end surface of the shell casting (6) are provided with a plurality of second slag bags (72), the first slag bags (71) and the second slag bags (72) are connected to the vacuum exhaust duct (8), the shell casting (6) is provided with a plurality of mounting lugs (63) and connection ports (64), and each of the mounting lugs (63) and connection ports (64) is connected to a third slag bag (73).

2. The housing die-casting mold according to claim 1, characterized in that: It also includes a cooling system, which includes a plurality of spot cooling pipes (15) arranged in the fixed mold insert (14), and the cooling height of the spot cooling pipes (15) is a predetermined distance from the top surface of the fixed mold insert (14).

3. The housing die-casting mold according to claim 1, characterized in that: The first slag bag (71) and the second slag bag (72) are located on the fixed mold core (13), the third slag bag (73) is located on the movable mold core (11), and the third slag bag (73) located at the rear of the shell casting (6) is connected to the vacuum exhaust duct (8).

4. The housing die-casting mold according to claim 3, characterized in that: The connection positions of the first slag bag (71) and the second slag bag (72) with the shell casting (6) are both higher than the height of the sealing groove.

5. The housing die-casting mold according to claim 1, characterized in that: The thick wall portion (62) located at the front end in the filling direction is connected to a fourth slag bag (74), and the fourth slag bag (74) is located in front of the shell casting (6).

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