A die-casting mold

Abstract

The utility model relates to a die -casting die, including the die, be provided with the first core -pulling rod that is connected with the core in the die, still be provided with the pin or second core -pulling rod that is arranged with the first core -pulling rod crossing, its characterized in that: first core -pulling rod is provided with the passageway that is set for the pin or second core -pulling rod to wear, the utility model discloses a passageway is set for the pin or second core -pulling rod to wear on the first core -pulling rod, in the die -casting process, the pin or second core -pulling rod can first move along the passageway to the outside, subsequently first core -pulling rod moves to the outside and will take out the core, to realize the forming of hole structure, and there is no interference between first core -pulling rod and second core -pulling rod or between first core -pulling rod and pin, thereby can realize smooth stripping and punching.

Description

Technical Field

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

[0002] Interference problems inside the mold are very common in the die casting process. They mainly include interference between different core-pulling rods and interference between the core-pulling rod and the pin.

[0003] In die casting, resin molding, and other processes, when a molded part needs to have multiple punches with different drawing directions in close proximity, if it is desired to use a core to cast the holes to form each punch, i.e., the product needs to be cast with multiple holes in close proximity, the common practice is to use a core to cast only the holes in one direction, while the holes in the other direction are formed through post-processing. However, this method not only increases the molding and processing costs of the product, but also often results in the part with the punches formed through post-processing being thicker than other parts, thus making it prone to porosity. If core pulling is required for all the punches simultaneously, the core pulling rods will interfere with each other.

[0004] When the punching position is close to the position where the pin pulls the product, interference will occur between the core-pulling rod and the pin. For example... Figure 1 The die-casting mold shown in the figure shows interference between the core-pulling rod and the pin used to pull the product. Pin 1' is connected to one side of product A, and core-pulling rod 2' is connected to the core on the other side of product 3'. Pin 1' and core-pulling rod 2' are located in the same horizontal plane. Molding product A requires mold opening before core pulling. During the mold opening process, when pin 1' moves horizontally to the right, it interferes with core-pulling rod 2', which makes both mold opening and core pulling impossible.

[0005] To address this, the existing Chinese utility model patent ZL201420373113.1 (publication number CN203957298U), entitled "A Mold Structure for Preventing Interference Between Core-Pulling Pins," discloses a structure to prevent interference. A core-pulling block is embedded in the upper center of the fixed mold core, and two symmetrically arranged, facing core-pulling pins are fixedly connected to the lower end of the core-pulling block. This avoids interference between the core-pulling pins during core pulling, allowing for smooth mold opening. However, this improvement requires the following prerequisites: first, there must be space for arrangement inside and around the mold; second, the direction of movement of the core-pulling rod or pins must be changeable. Figure 1 Taking die-casting molds as an example, the mold opening direction of die-casting molds is usually fixed. Pin 1' is pulled horizontally to the right by the hydraulic cylinder to open the mold, and the movement direction of pin 1' is fixed. Therefore, when the above two conditions cannot be met, the method of preventing interference by this improvement method will not be applicable. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a die-casting mold that avoids interference between different core-pulling rods located in close proximity or between the core-pulling rod and the pin, especially suitable for situations where the direction of core pulling or pulling the product to open the mold cannot be changed.

[0007] 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, a first core-pulling rod connected to the core is provided inside the mold, and a pin or a second core-pulling rod arranged crosswise with the first core-pulling rod is also provided, characterized in that: the first core-pulling rod is provided with a channel for the pin or the second core-pulling rod to pass through.

[0008] To improve the strength of the first core-pulling rod, preferably, the first core-pulling rod includes a first segment for connecting the core and a second segment for connecting the first drive source. A transition section is provided between the first and second segments. The cross-section of the second segment is larger than that of the first segment. The channel is provided on the second segment. Under the drive of the first drive source, the first core-pulling rod can pull the core out of the product. Since the second segment is used to connect to the first drive source, it needs to have a certain strength. Therefore, the cross-sectional area of ​​the second segment needs to be larger than that of the first segment. Furthermore, because the cross-sectional area of ​​the second segment is larger, the channel is provided on the second segment to avoid affecting the overall strength of the first core-pulling rod. Simultaneously, the transition section allows the first core-pulling rod to be integrally formed, resulting in stronger tensile strength.

[0009] Furthermore, the cross-sectional area of ​​the second rod segment is 125% to 300% larger than that of the first rod segment. The first and second rod segments can be designed as rods with circular, square, or other shapes of cross-section, but the cross-sectional area of ​​the second rod segment must be 125% to 300% larger than that of the first rod segment. The main reason is that if the cross-sectional area of ​​the second rod segment is too small relative to the first rod segment, the overall strength of the first core-pulling rod may be insufficient, leading to breakage during the core-pulling process. If the cross-sectional area of ​​the second rod segment is too large, the second rod segment will be thicker and occupy more space. Since the first core-pulling rod is located inside the die-casting mold, this may affect the arrangement of other components.

[0010] To ensure sufficient space for creating a channel through which the pin or second core-pulling rod can pass, preferably, the cross-sectional area of ​​the second rod segment is 125% to 525% larger than that of the pin or the second core-pulling rod, and the cross-sectional area of ​​the channel is 600% to 800% larger than that of the pin or the second core-pulling rod. For the pin or the second core-pulling rod to be able to pull outward without interfering with the first core-pulling rod, the following conditions must be met: first, the cross-sectional area of ​​the second rod segment must be large enough to allow for the channel; second, the channel must be large enough for the pin or the second core-pulling rod to pass through. When the cross-sectional area of ​​the second rod segment is too small relative to the pin or the second core-pulling rod, the volume difference between the second rod segment and the pin or the second core-pulling rod is small, making it difficult to machine the channel on the smaller second rod segment. When the cross-sectional area of ​​the second rod segment is too large relative to the pin or the second core-pulling rod, the volume of the second rod segment becomes too large, thus affecting the arrangement of other components inside the die-casting mold. Furthermore, when the cross-sectional area of ​​the channel is too small relative to the pin or the second core-pulling rod, the reserved space of the channel is small, which makes it easy for the pin or the second core-pulling rod to collide with the inner wall of the channel; when the cross-sectional area of ​​the channel is too large relative to the pin or the second core-pulling rod, the strength of the first core-pulling rod will be reduced and it will be easy to break.

[0011] To further improve the strength of the first core-pulling rod, preferably, the cross-section of the channel is flat, and the length L and width W1 of the channel satisfy: L = 3W1 to 4W1. The cross-section of the channel can be designed in various shapes, such as circular and square. The main reason for designing it as flat in this application is that, compared to other shaped channels, flat channels have better tensile strength and are less prone to breakage during core-pulling. When L < 3W1, the channel length is too short to meet the core-pulling stroke requirements; when L > 4W1, the channel is too long, occupying too much volume in the second rod segment and thus affecting the overall strength.

[0012] To avoid interference and collision, the first core-pulling rod moves outward by a stroke of S under the drive of the first driving source. The width of the pin or the second core-pulling rod is W2. The length L of the channel satisfies: L = S + W2 + D, where D is the clearance distance, and D ranges from 6 to 10 mm. During the die-casting mold operation, the second core-pulling rod or pin is positioned near the right end of the channel and moves outward along the channel under the drive of the second driving source. After the movement, the second core-pulling rod or pin remains inside the channel. Subsequently, the first core-pulling rod is pulled outward under the drive of the first driving source, with a stroke of S. Therefore, the length of the channel must be at least greater than the sum of the stroke of the first core-pulling rod and the width of the pin or the second core-pulling rod. This application reserves a clearance distance of 6 to 10 mm within the channel, mainly because: when the clearance distance is less than 6 mm, collisions are likely to occur between the first core-pulling rod and the pin; when the clearance distance is greater than 10 mm, the channel is too long, which can easily affect the strength of the first core-pulling rod.

[0013] Compared with the prior art, the advantages of this utility model are as follows: the first core-pulling rod is provided with a channel through which the pin or the second core-pulling rod passes. During the die-casting process, the pin or the second core-pulling rod can move outward along the channel first, and then the first core-pulling rod moves outward to pull out the core, thereby realizing the forming of the hole structure. There is no interference between the first core-pulling rod and the second core-pulling rod or between the first core-pulling rod and the pin, thereby enabling smooth demolding and punching. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a die-casting mold in the prior art;

[0015] Figure 2 This is a three-dimensional structural diagram of the die-casting mold in the first embodiment of the present invention (part of the mold is omitted);

[0016] Figure 3 This is a schematic diagram showing the change in the relative movement state of the first core-pulling rod to the pin in the first embodiment of this utility model;

[0017] Figure 4 This is a front view of the first core-pulling rod in the first embodiment of this utility model;

[0018] Figure 5 This is a three-dimensional structural diagram of the pin in the first embodiment of the present invention.

[0019] In the diagram: 1. Mold; 2. First core-pulling rod; 21. First rod segment; 22. Second rod segment; 3. Pin; 4. Channel; 5. First drive source; A. Product. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1

[0022] like Figures 1 to 5 The diagram shows the preferred embodiment of this utility model. The mold 1 used for molding in this embodiment is a known injection molding mold 1. The specific structure of the mold 1 will not be described in detail here. It should be emphasized that the mold opening direction of the die-casting mold is fixed. This die-casting mold includes a mold 1, within which a first core-pulling rod 2 connected to the core is provided, and a pin 3 arranged intersecting the first core-pulling rod 2 is also provided. A channel 4 for the pin 3 to pass through is provided within the first core-pulling rod 2.

[0023] refer to Figure 3 and Figure 4 In this embodiment, the preferred first core-pulling rod 2 is composed of a first rod segment 21 with a smaller cross-sectional area, a second rod segment 22 with a larger cross-sectional area, and a transition segment 23 connecting the first rod segment 21 and the second rod segment 22. The transition segment 23 allows the first core-pulling rod 2 to be integrally formed, resulting in stronger tensile strength. The first rod segment 21 connects to the core, and the second rod segment 22 connects to the first driving source 5. Under the drive of the first driving source 5, the first core-pulling rod 2 can pull the core out of product A. Since the second rod segment 22 is used to connect to the first driving source 5, it needs to have a certain strength. Therefore, the cross-sectional area of ​​the second rod segment 22 needs to be larger than that of the first rod segment 21. Furthermore, because the cross-sectional area of ​​the second rod segment 22 is larger, a channel 4 is formed on the second rod segment 22 to avoid affecting the overall strength of the first core-pulling rod 2 due to the channel 4. The first segment 21 and the second segment 22 can be designed as rods with circular, square, or other cross-sectional shapes. However, the cross-sectional area of ​​the second segment 22 must be 125% to 300% larger than that of the first segment 21. The main reason is that if the cross-sectional area of ​​the second segment 22 is too small relative to the first segment 21, the overall strength of the first core-pulling rod 2 may be insufficient, leading to breakage during the core-pulling process. If the cross-sectional area of ​​the second segment 22 is too large, it will be thicker and occupy more space. Since the first core-pulling rod 2 is located inside the die-casting mold, this may affect the arrangement of other components. In this embodiment, while meeting strength requirements, the cross-sectional area of ​​the second segment 22 is preferably designed to be 125% larger than that of the first segment 21.

[0024] refer to Figure 3 and Figure 4For the pin 3 to be able to pull outward without interfering with the first core-pulling rod 2, the following conditions must be met: First, the second segment 22 of the first core-pulling rod 2 must have a large volume to allow for the opening of the channel 4; second, the opening of the channel 4 must allow the pin 3 to pass through. In this embodiment, the cross-sectional area of ​​the second segment 22 is 125% to 525% larger than the cross-sectional area of ​​the pin 3, and the cross-sectional area of ​​the channel 4 is 600% to 800% larger than the cross-sectional area of ​​the pin 3. The main reason is that when the cross-sectional area of ​​the second segment 22 is designed to be too small relative to the pin 3, the volume difference between the second segment 22 and the pin 3 is small, making it difficult to process the channel 4 on the second segment 22 with a smaller cross-sectional area; when the cross-sectional area of ​​the second segment 22 is designed to be too large relative to the pin 3, the volume of the second segment 22 becomes too large, thus affecting the arrangement of other components inside the die-casting mold. In this embodiment, the cross-sectional area of ​​the second segment 22 is minimized as much as possible while meeting processing requirements; therefore, the cross-sectional area of ​​the second segment 22 is preferably greater than 125% of the cross-sectional area of ​​the pin 3. Furthermore, when the cross-sectional area of ​​channel 4 is too small relative to the pin 3, the reserved space of channel 4 is small, which makes it easy for the pin 3 to collide with the inner wall of channel 4; when the cross-sectional area of ​​channel 4 is too large relative to the pin 3, the strength of the first core-pulling rod 2 will be reduced and it will be easy to break. In this embodiment, the cross-sectional area of ​​channel 4 is preferably greater than 600% of the cross-sectional area of ​​pin 3, while ensuring that no collision occurs.

[0025] Furthermore, to further improve the strength of the first core-pulling rod 2, the cross-section of the channel 4 in this embodiment is designed to be flat (see reference). Figure 3 and Figure 4 The main reason is that, compared to channels 4 of other shapes such as circles and squares, the flat channel 4 has better tensile strength and is less prone to breakage during the core-pulling process. Specifically, the length L and width W1 of the channel 4 satisfy the following condition: L = 3W1 to 4W1. When L < 3W1, the length of the channel 4 is too short to meet the core-pulling stroke requirements; when L > 4W1, the channel 4 is too long, occupying too much volume of the second rod segment 22, which will affect the overall strength. Therefore, in this embodiment, L = 3W1 is preferred. Meanwhile, the length L of channel 4 also satisfies: L = S + W2 + D, where S is the stroke of the first core-pulling rod 2 moving outward under the drive of the first driving source 5, W2 is the width of the pin 3, and D is the clearance distance, which is in the range of 6 to 10 mm. The main reason is that when the clearance distance D is less than 6 mm, the first core-pulling rod 2 and the pin 3 are prone to collision; when the clearance distance is greater than 10 mm, the channel 4 is too long, which can easily affect the strength of the first core-pulling rod 2. In this embodiment, the clearance distance D is preferably 6 mm to avoid collision.

[0026] The specific working process is as follows: The initial position of pin 3 is set near the right side of channel 4. Under the drive of the second drive source, pin 3 first pulls product A outward along channel 4, thereby pulling product A out of the cavity. Then, under the drive of the first drive source 5, the first core-pulling rod 2 pulls the core outward. The first core-pulling rod 2 moves from the first position to the second position (see reference). Figure 3 At this time, pin 3 is located near the left side of channel 4, and a punch is formed on product A. During the operation, there will be no interference between the first core-pulling rod 2 and pin 3.

[0027] Example 2

[0028] The only difference between this embodiment and embodiment 1 is that the pin 3 structure is replaced by the second core-pulling rod. The application scenario of this embodiment is that a molded product needs to have punched structures with different drawing directions at positions close to each other. One end of the first core-pulling rod 2 is connected to a core, and the other end is connected to the first driving source 5; one end of the second core-pulling rod is connected to another core, and the other end is connected to the second driving source.

[0029] The specific working process is as follows: The initial position of the second core-pulling rod is set near the right side of channel 4. Under the drive of the second drive source, the second core-pulling rod first pulls the core outward along channel 4, thereby realizing the first punching. Then, under the drive of the first drive source 5, the first core-pulling rod 2 pulls the other core outward, thereby completing the second punching. The first core-pulling rod 2 moves from the first position to the second position (refer to...). Figure 3 At this time, the second core-pulling rod is located near the left side of channel 4, and the first core-pulling rod 2 and the second core-pulling rod will not interfere with each other during operation.

Claims

1. A die-casting mold, comprising a mold (1), wherein a first core-pulling rod (2) connected to a core is provided inside the mold (1), and a pin (3) or a second core-pulling rod arranged intersecting the first core-pulling rod (2) is also provided, characterized in that: The first core-pulling rod (2) is provided with a channel (4) through which the pin (3) or the second core-pulling rod passes.

2. The die-casting mold according to claim 1, characterized in that: The first core-pulling rod (2) includes a first rod segment (21) for connecting the core and a second rod segment (22) for connecting the first drive source (5). A transition section (23) is provided between the first rod segment (21) and the second rod segment (22). The cross-section of the second rod segment (22) is larger than that of the first rod segment (21). The channel (4) is provided on the second rod segment (22). Under the drive of the first drive source (5), the first core-pulling rod (2) can pull the core out of the product (A).

3. The die-casting mold according to claim 2, characterized in that: The cross-sectional area of ​​the second segment (22) is 125% to 300% larger than that of the first segment (21).

4. The die-casting mold according to claim 3, characterized in that: The cross-sectional area of ​​the second rod segment (22) is 125% to 525% larger than that of the pin (3) or the second core-pulling rod, and the cross-sectional area of ​​the channel (4) is 600% to 800% larger than that of the pin (3) or the second core-pulling rod.

5. The die-casting mold according to any one of claims 2 to 4, characterized in that: The cross-section of the channel (4) is flat, and the length L and width W1 of the channel (4) satisfy: L=3W1~4W1.

6. The die-casting mold according to claim 5, characterized in that: The first core-pulling rod (2) moves outward by a stroke of S under the drive of the first driving source (5), the width of the pin (3) or the second core-pulling rod is W2, and the length L of the channel (4) satisfies: L=S+W2+D, where D is the clearance distance and the range of D is 6~10mm.

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