A die-casting mold

Abstract

The utility model discloses a die -casting die, including upper pressure mould, lower pressure mould, inlay, core -pulling, core rod, upper pressure mould includes pressure mould boss, lower pressure mould includes pressure mould recess, and the cavity is formed between pressure mould boss and pressure mould recess, and upper pressure mould is equipped with the inlay groove, and the inlay groove is communicated with the upper end surface of upper pressure mould and the cavity, and the inlay is inserted in the inlay groove, and the inlay includes the convex strip, and the convex strip forms a part of pressure mould boss, and the core -pulling is installed in the side of upper pressure mould and lower pressure mould, and the convex strip is equipped with the first through -hole, and the core -pulling is equipped with the second through -hole, and the core rod passes through the first through -hole and the second through -hole, the utility model discloses the core -pulling and core rod in the die -casting die design inside, and the core -pulling is positioned and inserted through the inlay, forms the pre -casting hole after alloy liquid fills, and the core -pulling is extracted after the casting forms, and the incidence of the inner hole defect is reduced.

Description

Technical Field

[0001] This utility model relates to the field of metal mold technology, and more specifically, to a die-casting mold. Background Technology

[0002] Currently, it is difficult to achieve absolutely uniform wall thickness in most die-cast parts. Some castings have isolated, thick sections. If the wall thickness is uneven or excessively thick, the casting will be difficult to form or will develop shrinkage cavities, resulting in quality failure. After machining, the internal holes in these areas will be exposed, leading to a very high scrap rate. Special processes such as localized pressurization have been developed in the industry, but due to their complexity and the high requirements for the operating skills of ordinary employees and the manufacturing of die-casting machines and molds, they cannot completely solve the problem. Therefore, a technical solution is needed to address the above issues. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and prevent the formation of air holes due to excessive local thickness, thereby providing a die-casting mold.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model discloses a die-casting mold, including an upper die, a lower die, an insert, a core puller, and a core rod. The upper die includes a die protrusion, and the lower die includes a die groove. A cavity is formed between the die protrusion and the die groove. The upper die has a groove that connects the upper end face of the upper die and the cavity. The insert is inserted into the groove and includes a ridge that forms part of the die protrusion. The core puller is installed on the side of the upper die and the lower die. The ridge has a first through hole, and the core puller has a second through hole. The core rod passes through the first through hole and the second through hole.

[0006] Furthermore, the insert includes an insert body located within the groove, and a limiting block is provided at the upper end of the insert body, the limiting block forming a limit on the insert in the upper mold.

[0007] Furthermore, the upper mold is provided with a first slot and a second slot, the first slot being connected to the outer side of the upper mold, and the second slot being connected to the cavity and the first slot. The lower mold is provided with a third slot and a fourth slot, the third slot being connected to the outer side of the lower mold, and the fourth slot being connected to the cavity and the third slot. The core pulling includes a first block and a second block, the first block being inserted into the first slot and the third slot, and the second block being inserted into the second slot and the fourth slot.

[0008] Furthermore, the core rod includes a first section and a second section, the first section being located within the second through hole, a portion of the second section being located within the first through hole, and the diameter of the first section being smaller than the diameter of the second section.

[0009] Furthermore, the end of the second segment away from the first segment extends out of the first through hole, and the end of the second segment away from the first segment abuts against the molding protrusion, and the profile formed by the cavity forms the first pre-cast hole through the second segment.

[0010] Furthermore, the portion between the first segment and the second segment is located within the cavity, and the profile formed by the cavity forms a second pre-cast hole through the portion between the first segment and the second segment.

[0011] Furthermore, the core puller is provided with a limiting groove located on the outer side of the core puller, and the core rod is provided with a limiting ring corresponding to the limiting groove. The limiting groove forms a limit for the inward installation of the core rod.

[0012] Furthermore, the core puller has a cooling channel inside, which allows it to cool the core rod.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model designs an internal core-pulling and core rod in the die-casting mold. The core is positioned and inserted by an insert block. The core rod extends into the cavity and passes through part of the die-casting protrusion. Due to the setting of the core rod, the thick block and protrusion after die-casting will form a first pre-casting hole and a second pre-casting hole. The pre-casting hole is formed in the part that would otherwise need to be machined away, reducing the machining allowance. At the same time, it can reduce the wall thickness of the thick block and protrusion, preventing local excessive thickness from causing air holes and slow cooling.

[0015] 2. In this embodiment, the core pulling and core rod need to be inserted and pulled out multiple times. In order to avoid wear on the upper and lower molds, an insert structure is adopted, so that the part of the upper mold through which the core rod passes is replaced by the insert. If wear occurs, it can be replaced without replacing the entire upper mold. The cost of the insert is negligible compared to the increased cost caused by the scrap rate of the casting. Attached Figure Description

[0016] Figure 1 This is an exploded view of this embodiment.

[0017] Figure 2 This is a schematic diagram of the upper mold in this embodiment.

[0018] Figure 3 This is a schematic diagram of a pressing mold in this embodiment.

[0019] Figure 4This is a schematic diagram of a block in this embodiment.

[0020] Figure 5 This is a schematic diagram of a core-pulling method in this embodiment.

[0021] Figure 6 This is a cross-sectional view showing the connection of the insert, core puller, and core rod in this embodiment.

[0022] Figure 7 This is a schematic diagram of a profile in this embodiment.

[0023] Reference numerals: 1. Upper die; 11. Die protrusion; 12. Groove; 13. First slot; 14. Second slot; 2. Lower die; 21. Die groove; 22. Third slot; 23. Fourth slot; 3. Insert; 31. Insert body; 312. Limiting block; 32. Protrusion; 321. Die surface; 322. First through hole; 4. Core pulling; 41. First block; 42. Second block; 43. Second through hole; 431. Limiting groove; 5. Core rod; 51. First section; 511. Limiting ring; 52. Second section; 101. Profile; 1011. Forming groove; 1012. Thick block; 1013. First pre-cast hole; 1014. Boss; 1015. Second pre-cast hole. Detailed Implementation

[0024] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] like Figures 1 to 7 As shown, this embodiment discloses a die-casting mold, including an upper die 1, a lower die 2, an insert 3, a core puller 4, and a core rod 5. The upper die 1 includes a die protrusion 11, and the lower die 2 includes a die groove 21. After the upper die 1 and the lower die 2 are assembled, a cavity is formed between the die protrusion 11 and the die groove 21. A profile 101 is formed by pouring in molten metal. In the past, conventional molds only used the upper die 1 and the lower die 2 for die casting. The profile 101 has a thicker part, such as a thick block 1012 and a boss 1014. The thick block 1012 and the boss 1014 need to be drilled later. If air holes appear after drilling, the profile 101 is scrapped.

[0026] This embodiment employs a core-pulling mechanism 4 on the side of the mold. The core-pulling mechanism 4 is installed on the side of the upper mold 1 and the lower mold 2. The upper mold 1 has a first slot 13 and a second slot 14. The first slot 13 connects to the outer side of the upper mold 1, and the second slot 14 connects the cavity and the first slot 13. The lower mold 2 has a third slot 22 and a fourth slot 23. The third slot 22 connects to the outer side of the lower mold 2, and the fourth slot 23 connects the cavity and the third slot 22. The core-pulling mechanism 4 includes a first block 41 and a second block 42. The first block 41 is inserted into the first slot 13 and the third slot 22, and the second block 42 is inserted into the second slot 14 and the fourth slot 23. The core-pulling mechanism 4 can pull the core out of the mold... The core is inserted from the side, and the core puller 4 is pushed into the mold by the thrust of the hydraulic cylinder. The first block 41 is positioned against the first slot 13. The inner sidewall of the second block 42 forms part of the mold groove 21. The core puller 4 is provided with a second through hole 43. The core rod 5 passes through the second through hole 43, extends into the cavity, and passes through part of the mold protrusion 11. Due to the setting of the core rod 5, the die-cast block 1012 and the boss 1014 will form the first pre-cast hole 1013 and the second pre-cast hole 1015. The pre-cast hole is formed in the part that would have been processed away, which reduces the processing allowance. At the same time, it can reduce the wall thickness of the block 1012 and the boss 1014, and prevent the local excessive thickness from causing air holes and slow cooling.

[0027] The core puller 4 is provided with a limiting groove 431, which is located on the outer side of the core puller 4. The core rod 5 is provided with a limiting ring 511, which corresponds to the limiting groove 431. The limiting groove 431 forms a limit for the inward installation of the core rod 5. The limiting groove 431 is provided with a horizontal notch, which can rotate and limit the installation of the core rod 5. The core puller 4 is provided with a cooling channel inside, which can cool the core rod 5. The internal cooling channel of the core puller 4 continuously cools the core rod 5 under the action of high-pressure cooling water, which cools the casting in time during the solidification process. The pre-cast holes of the casting form a dense hardened layer under the influence of the low temperature core rod 5, which reduces the occurrence rate of porosity and shrinkage cavities at the thick block 1012 and the boss 1014.

[0028] In this embodiment, the core puller 4 and core rod 5 need to be inserted and pulled out multiple times. In order to avoid wear on the upper die 1 and the lower die 2, a block 3 structure is adopted. The upper die 1 is provided with a groove 12, which connects the upper end face of the upper die 1 and the cavity. The block 3 is inserted into the groove 12. The block 3 includes a body 31 and a protrusion 32. The body 31 is located in the groove 12, and the protrusion 32 is located at the lower end of the body 31. The protrusion 32 forms part of the die protrusion 11. The lower end face of the protrusion 32 is the die surface 321. The protrusion 32 can form a forming groove 1011 on the profile 101. The protrusion 32 is provided with a first through hole 322, so that the part of the upper die 1 through which the core rod 5 passes is replaced by the block 3. It can be replaced in case of wear, without having to replace the entire upper die 1. The cost of the block 3 is negligible compared to the increased cost caused by the scrap rate of the casting.

[0029] The upper end of the insert 31 is provided with a limiting block 312, which forms a limit on the insert 3 in the upper mold 1. The limiting block 312 can position the installation depth of the insert 3.

[0030] The core rod 5 includes a first section 51 and a second section 52. The first section 51 is located inside the second through hole 43, and a portion of the second section 52 is located inside the first through hole 322. The diameter of the first section 51 is smaller than the diameter of the second section 52 to facilitate the core rod 5 to be pulled out and demolded. The end of the second section 52 away from the first section 51 extends out of the first through hole 322, and the end of the second section 52 away from the first section 51 abuts against the mold protrusion 11. The profile 101 formed by the cavity forms a first pre-cast hole 1013 through the second section 52. The portion between the first section 51 and the second section 52 is located inside the cavity, and the profile 101 formed by the cavity forms a second pre-cast hole 1015 through the portion between the first section 51 and the second section 52.

[0031] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A die-casting mold, characterized in that, The assembly includes an upper die (1), a lower die (2), an insert (3), a core puller (4), and a core rod (5). The upper die (1) includes a die protrusion (11), and the lower die (2) includes a die groove (21). A cavity is formed between the die protrusion (11) and the die groove (21). The upper die (1) is provided with a slot (12), which connects the upper end face of the upper die (1) and the cavity. The insert (3) is inserted into the cavity. Connected to the groove (12), the insert (3) includes a protrusion (32), which forms part of the pressing protrusion (11). The core puller (4) is installed on the side of the upper pressing die (1) and the lower pressing die (2). The protrusion (32) is provided with a first through hole (322), and the core puller (4) is provided with a second through hole (43). The core rod (5) passes through the first through hole (322) and the second through hole (43).

2. The die-casting mold according to claim 1, characterized in that, The insert (3) includes an insert (31) located in the groove (12). The upper end of the insert (31) is provided with a limiting block (312), which limits the insert (3) in the upper mold (1).

3. The die-casting mold according to claim 1, characterized in that, The upper mold (1) is provided with a first slot (13) and a second slot (14). The first slot (13) is connected to the outer side of the upper mold (1), and the second slot (14) is connected to the cavity and the first slot (13). The lower mold (2) is provided with a third slot (22) and a fourth slot (23). The third slot (22) is connected to the outer side of the lower mold (2), and the fourth slot (23) is connected to the cavity and the third slot (22). The core puller (4) includes a first block (41) and a second block (42). The first block (41) is inserted into the first slot (13) and the third slot (22), and the second block (42) is inserted into the second slot (14) and the fourth slot (23).

4. The die-casting mold according to claim 1, characterized in that, The core rod (5) includes a first section (51) and a second section (52). The first section (51) is located in the second through hole (43), and a portion of the second section (52) is located in the first through hole (322). The diameter of the first section (51) is smaller than the diameter of the second section (52).

5. The die-casting mold according to claim 4, characterized in that, The second segment (52) extends out of the first through hole (322) at one end away from the first segment (51), and the second segment (52) abuts against the mold protrusion (11) at one end away from the first segment (51). The profile (101) formed by the cavity forms the first pre-cast hole (1013) through the second segment (52).

6. The die-casting mold according to claim 4, characterized in that, The portion between the first segment (51) and the second segment (52) is located within the cavity, and the profile (101) formed by the cavity forms a second pre-cast hole (1015) through the portion between the first segment (51) and the second segment (52).

7. The die-casting mold according to claim 1, characterized in that, The core puller (4) is provided with a limiting groove (431), which is located on the outer side of the core puller (4). The core rod (5) is provided with a limiting ring (511), which corresponds to the limiting groove (431). The limiting groove (431) forms a limit for the core rod (5) to be installed inward.

8. The die-casting mold according to claim 1, characterized in that, The core puller (4) has a cooling channel inside, which can cool the core rod (5).

Images