Die-casting die

Abstract

A die-casting die comprises a die body, a cavity and a pin are arranged in the die body, and the pin is provided with a hole forming part. The pin hole forming mold is characterized by further comprising an air exhaust assembly which is arranged in the mold main body, is used for performing air exhaust operation on a formed pin hole and comprises an air exhaust connecting piece connected with a pin; the pin is provided with a connecting part used for being connected with the air exhaust connecting piece, the end of the connecting part of the pin protrudes outwards compared with the bottom of the hole forming part, a forming part is formed on the end of the connecting part of the pin, and an air exhaust gap is formed between the hole forming part and the hole wall of the pin hole. Compared with the bottom of the hole forming part, the end part of the connecting part protrudes outwards relative to the hole wall of the pin hole to form the forming part, so that the matching relation between the pin and the air exhaust connecting piece is stable, and an air exhaust channel communicated with the air exhaust gap is formed while the pin is matched with the air exhaust connecting piece; and an operator can extract gas in the air extraction gap through the air extraction channel, so that the air extraction device has the advantage of being dual-purpose.

Description

Technical Field

[0001] This utility model belongs to the technical field of die casting manufacturing equipment, and in particular relates to a die casting mold with better pin hole forming performance. Background Technology

[0002] In die-casting molds, pins are generally used to form holes in the product. The structure for forming holes can refer to the mold structure disclosed in Chinese Utility Model Patent No. ZL201320626656.5 (Publication No. CN203484640U), which includes a moving mold device and a fixed mold device. The moving mold pin assembly on the moving mold device and the fixed mold pin assembly on the fixed mold device can form pin holes for the die-casting part at the connection with the die-casting cavity. During the pin hole forming process of the die-casting part, because the inner cavity of the die-casting mold is a relatively closed space before the die-casting is completed, the entry of aluminum liquid carries a large amount of air. Countless small bubbles will cause a lot of erosion to the mold. In particular, the gas in the pin hole often cannot be expelled, resulting in a large number of pores near the pin hole and causing appearance defects in the die-cast product. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a die-casting mold that can better discharge gas from the pin hole, in view of the above-mentioned existing technology.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: the die casting mold includes a mold body, the mold body has a cavity and a pin for forming the cavity, and the pin has a hole forming part that extends into the cavity and is used for forming pin holes in the product;

[0005] Its characteristic is that it further includes:

[0006] An air extraction assembly, located inside the mold body, is used to extract air from the formed pin hole, and includes an air extraction connector connected to the pin.

[0007] Correspondingly, the pin is provided with a connecting portion for connecting the air extraction connector. The end of the connecting portion of the pin protrudes further outward from the bottom of the hole relative to the hole wall of the pin hole, and is formed with a forming portion that can cooperate with the air extraction connector to form an air extraction channel. An air extraction gap is formed between the hole and the hole wall of the pin hole, which is in fluid communication with the air extraction channel.

[0008] To simplify the processing of the forming part, preferably, the forming part consists of at least two ribs spaced circumferentially along the ends of the connecting portion of the pin. Each rib is at an angle to or parallel to the central axis of the pin, and the interval between any two adjacent ribs together constitutes the suction channel. When the ribs are at an angle to the central axis of the pin, a rifling structure similar to a "spiral" can be formed, which can improve the suction speed of the suction channel. Alternatively, the ribs can be parallel to the central axis of the pin; parallel, spaced ribs allow the gas in the suction gap to be evenly drawn into the suction channel.

[0009] To better extract air from the pin hole through the extraction channel, the extraction connector is further designed as an open-ended sleeve. The sleeve is sealed to the end of its connection with the pin, and an extraction pipe is provided near the seal. The extraction assembly includes an external extraction pump, which is connected to the extraction channel via the extraction pipe. Designing the extraction connector as an open-ended sleeve structurally simplifies the formation of an extraction channel with the pin and allows the extraction pump to remove air from the pin hole.

[0010] To prevent turbulence during gas extraction, the sleeve's cross-section is further divided into a straight section and an expanding section along the airflow direction. The straight section is tightly connected to each rib, while the gap between the expanding section and the end of the pin's connection forms a downstream section located downstream of the extraction channel. The expanding section helps to slow down the flow rate of the gas extracted from the straight section.

[0011] To prevent air leakage in the extraction channel and facilitate smoother connection of air in the pin hole to the external air pump via the extraction pipe, the end of the expansion section is further provided with an annular inner step, and a sealing element is provided between the annular inner step and the sleeve. The purpose of providing the annular inner step is to increase the tightness of the connection between the sleeve-shaped extraction connector and the pin, while also providing a better seal.

[0012] To improve the suction speed of the suction channel, the protruding length of the rib is preferably 0.1 mm. When the protruding length of the rib is less than 0.1 mm, it is difficult to perform suction due to the small opening of the suction gap; while when the protruding length of the rib is greater than 0.1 mm, it is also difficult to achieve faster suction due to the large opening of the suction gap.

[0013] To facilitate rapid forming of the pin hole, a cooling channel for cooling water to flow into is further provided inside the pin. Operators can quickly reduce the temperature of the pin hole wall by introducing coolant into the cooling channel.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] 1. The end of the connecting part protrudes further outward from the bottom of the hole relative to the hole wall of the pin hole, which is a characteristic of the forming part. This not only ensures a stable fit between the pin and the air extraction connector, but also forms an air extraction channel that communicates with the air extraction gap. Operators can extract the gas in the air extraction gap through the air extraction channel, which has the advantage of "one thing for two purposes".

[0016] 2. In addition, the design of the molding part and the connecting part forming an air extraction channel means that the mold core does not have to be used as the channel wall. Operators can change the flow position of the air extraction channel and the air extraction gap by adjusting the end face size of the air extraction connector, which increases the dimensional flexibility of the air extraction component. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the product structure according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the die-casting mold according to an embodiment of the present utility model;

[0019] Figure 3 This is a cross-sectional view of the die-casting mold according to an embodiment of the present utility model;

[0020] Figure 4 for Figure 3 A close-up view of the assembly point between the center pin and the air extraction connector;

[0021] Figure 5 for Figure 4 A magnified view of a section at point A; where point A is the connection between the extraction gap and the extraction channel.

[0022] Figure 6 for Figure 4 A magnified view of a portion at point B; where point B is the connection point between the exhaust channel and the downstream section.

[0023] Figure 7 This is a schematic diagram of the assembly of the air extraction connector and the pin according to an embodiment of the present utility model;

[0024] Figure 8 This is a cross-sectional view of the air extraction connector and pin after assembly according to an embodiment of the present utility model;

[0025] Figure 9 This is a schematic diagram of the pin structure according to an embodiment of the present utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the air extraction connector according to an embodiment of the present utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1-10 The figure shown is the preferred embodiment of this utility model.

[0029] The die-casting mold of this embodiment is mainly used for molding products with pin holes. During the aluminum molten pouring process, gas is easily introduced into the mold cavity, causing bubble-like defects on the hole walls of the formed pin holes, which affects the quality of the product. Therefore, it would be beneficial to provide a die-casting mold that can better expel gas from the pin holes. The following is a detailed description of the structure of this die-casting mold:

[0030] See Figures 1-9 The die-casting mold of this embodiment includes a mold body 1, which has a cavity 11 and a pin 3 for forming the cavity 11. The pin 3 has a hole-forming portion 31 that extends into the cavity 11 and is used to form a pin hole 11' for product 1'. The die-casting mold also includes a vacuum assembly 2 disposed in the mold body 1. The vacuum assembly 2 is used to perform a vacuuming operation on the formed pin hole 11'. The vacuum assembly 2 includes a vacuum connector 4 connected to the pin 3, an external vacuum pump 8, and a vacuum pipe 7 connecting the vacuum connector 4 and the vacuum pump 8. The pin 3 with the formed pin hole 11' is provided with a connecting portion 32 for connecting the vacuum connector 4. In this embodiment, the end of the connecting portion 32 of the pin 3 protrudes further outward relative to the bottom of the hole portion 31 and relative to the hole wall of the pin hole 11', and is formed with a formed portion 321 that can cooperate with the vacuum connector 4 to form a vacuum channel 5. Furthermore, a vacuum gap 6 that is in fluid communication with the vacuum channel 5 is formed between the hole portion 31 and the hole wall of the pin hole 11'. To avoid the problem of vacuum obstruction caused by the gap opening of the vacuum gap 6 being too large or too small, see [reference needed]. Figure 8 and 9 In this embodiment, the forming part 321 consists of at least two ribs spaced circumferentially along the ends of the connecting part 32 of the pin 3. Each rib is parallel to the central axis of the pin 3, and the interval between any two adjacent ribs together forms the suction channel 5. The protruding length of the ribs is set to 0.1 mm. When the protruding length is less than 0.1 mm, suction is difficult due to the small opening of the suction gap 6; conversely, when the protruding length is greater than 0.1 mm, faster suction is also difficult due to the large opening of the suction gap 6. The spaced ribs ensure that the gas in the suction gap 6 is evenly drawn into the suction channel 5, thereby achieving uniform air intake in the suction channel 5.

[0031] See Figure 4 and Figure 10The air extraction connector 4 is a sleeve with open top and bottom. The end of the sleeve is sealed to the connection part 32 of the pin 3, and an air extraction pipe 7 is provided near the seal. The air extraction assembly 2 includes an external air pump 8, which is connected to the air extraction channel 5 through the air extraction pipe 7. Designing the air extraction connector 4 as an open top and bottom sleeve makes it easier to form an air extraction channel 5 with the pin 3. The air pump 8 is used to extract the air from the pin hole, allowing the operator to better extract the air from the pin hole to the outside through the air extraction channel 5.

[0032] To accelerate the extraction speed, extraction systems typically employ structures that prevent turbulence. (See [link / reference]). Figure 9 In this embodiment, along the direction of airflow, the cross-section of the sleeve is divided into a straight section 41 and an expanded section 42. The straight section 41 is tightly connected to each of the ribs, while the gap between the expanded section 42 and the end of the connection portion 32 of the pin 3 constitutes the downstream section 9 located downstream of the suction channel 5. The expanded section 9 can slow down the flow rate of the gas extracted by the straight section 41, thus preventing turbulence from occurring in the gas within the suction channel 5 during extraction.

[0033] The end of the expansion section 42 is provided with an annular inner step 421, and a sealing element 10 is provided between the annular inner step 421 and the sleeve. The purpose of providing the annular inner step 421 is to increase the tightness of the connection between the sleeve-shaped air extraction connector 4 and the pin 3, while also providing a better sealing element 10 to prevent air leakage in the air extraction channel 5, so that the air in the pin hole can be connected to the external air pump 8 through the air extraction pipe 7 more smoothly.

[0034] Finally, a cooling channel 33 is provided inside the pin 3 for cooling water to flow in. Operators can quickly reduce the temperature of the pin hole 11' wall by introducing coolant into the cooling channel 33, which facilitates the rapid forming of the pin hole 11'.

[0035] The working principle of the die-casting mold in this embodiment is as follows: During the process of pouring molten aluminum into the cavity 11 to form the hole wall of the pin hole 11', the operator simultaneously turns on the air pump 8. The gas in the air extraction gap 6 is extracted out of the die-casting mold through the air extraction channel 5, the downstream section 9, and the air extraction pipe 7, which solves the problem of defects in the hole wall of the pin hole 11'. The end of the connecting part 32 protrudes further outward from the bottom of the hole forming part 31 relative to the hole wall of the pin hole 11', which is a characteristic of the forming part 321, and also makes the fit between the pin 3 and the air extraction connecting part 4 stable. While extracting the gas, the operator can introduce coolant through the cooling channel 33 to accelerate the forming process of the hole wall of the pin hole 11'.

Claims

1. A die-casting die comprising a die body (1) having a cavity (11) inside and a pin (3) for forming the cavity (11), the pin (3) having a hole forming portion (31) extending into the cavity (11) and used for forming a pin hole (11') of a product (1'); characterized in that Further comprising: an air extraction assembly (2) arranged in the die body (1) and used for performing air extraction operation on the formed pin hole (11'), comprising an air extraction connecting member (4) connected with the pin (3); Correspondingly, the pin (3) is provided with a connecting portion (32) used for connecting the air extraction connecting member (4), an end portion of the connecting portion (32) of the pin (3) is more outwardly protruded relative to a bottom portion of the hole forming portion (31) relative to a hole wall of the pin hole (11'), and is formed with a forming portion (321) capable of cooperating with the air extraction connecting member (4) to form an air extraction passage (5), and an air extraction gap (6) in fluid communication with the air extraction passage (5) is formed between the hole forming portion (31) and the hole wall of the pin hole (11').

2. The die casting mold according to claim 1, characterized in that: The forming portion (321) is at least two protruding ribs arranged along the end portion of the connecting portion (32) of the pin (3) in a circumferential direction, each of the protruding ribs has an included angle with a central axis of the pin (3) or is parallel to the central axis, and a spacing section between each two adjacent protruding ribs collectively forms the air extraction passage (5).

3. The die casting mold according to claim 2, characterized in that: The air extraction connecting member (4) is a sleeve open upward and downward, the sleeve is sealingly connected with an end portion of the connecting portion (32) of the pin (3), and is provided with an air extraction pipe (7) adjacent to the sealing portion, the air extraction assembly (2) comprises an externally connected air extraction pump (8), and the air extraction pump (8) is connected with the air extraction passage (5) in an air path through the air extraction pipe (7).

4. The die casting mold according to claim 3, characterized in that: In the direction of air flow, a cross section of the sleeve is divided into a flat section (41) and an expansion section (42), the flat section (41) is closely connected with each of the protruding ribs, and a gap between the expansion section (42) and the end portion of the connecting portion (32) of the pin (3) forms a downstream section (9) located downstream of the air extraction passage (5).

5. The die casting mold according to claim 4, characterized in that: An end section of the expansion section (42) is provided with an annular inner step (421), and a sealing member (10) is arranged between the annular inner step (421) and the sleeve.

6. The die casting mold according to claim 2, characterized by: The protruding length of the protruding rib is 0.1 mm.

7. The die casting mold according to any one of claims 1 to 6, characterized in that: The pin (3) is further provided with a cooling passage (33) for flowing cooling water.

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