Exhaust and deslagging structure of die-casting die, die opening structure and die opening method of die-casting die

Abstract

The invention discloses an air and slag discharging structure, a die opening structure and a die opening method of a die-casting die, and belongs to the technical field of die-casting dies. A casting cavity and a slag piece cavity are formed in the die-casting die, and after molten metal liquid enters the casting cavity and the slag piece cavity, the slag piece cavity is formed in the die-casting die; a casting and a slag part are formed in the casting cavity and the slag part cavity respectively, the slag part comprises a front part, a first rear part and a second rear part, the front part is formed at the end of the casting, and the first rear part and the second rear part are formed at the other end of the front part; the first rear portion and the second rear portion are oppositely arranged on the end side of the front portion, step structures are formed in the connecting position of the first rear portion and the front portion and the connecting position of the second rear portion and the front portion, and the positions where the step structures are located are the breaking positions of the slag piece. The casting treatment efficiency can be effectively improved, and the consumption of labor cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of die casting mold technology, and particularly relates to a venting and slag removal structure, mold opening structure and mold opening method of a die casting mold. Background Technology

[0002] Die casting, as one of the core technologies in the field of metal forming, leverages its characteristics of "high-pressure, high-speed filling and high-pressure solidification" to mass-produce high-precision, high-complexity, and high-strength metal parts. It is widely used in key areas such as automobiles (e.g., gearbox housings, motor end covers), motorcycles (engine blocks), electronics (5G base station radiators), and home appliances (air conditioning compressor components). Taking the automotive industry as an example, die-cast parts account for 15%-20% of a passenger car's components. Among these, deep-cavity castings (e.g., motor housings and valve body shells with a depth ≥50mm) present significant challenges in die casting production due to their unique structure.

[0003] In the production of deep-cavity castings, the "depth-to-diameter ratio" (the ratio of cavity depth to inner diameter) of the mold cavity is relatively large. When the molten metal fills the cavity under high pressure, it squeezes air, paint volatiles, and other gases into the cavity to the end. If venting is not timely, the gases are easily trapped inside the molten metal, forming "air pits" (surface depressions with a diameter of 0.5-2 mm), "bubbles" (internal voids), or "pinholes" (tiny holes with a diameter ≤0.1 mm) after cooling. This severely affects the mechanical properties of the casting—for example, the tensile strength of ADC12 aluminum alloy castings can decrease by 10%-15% due to air pit defects, and the fatigue life can be shortened by more than 20%. To solve this problem, existing die-casting molds are generally designed with "venting and slag removal structures." By setting a "slag cavity" at the end of the casting cavity, the gases, oxide slag, and impurities in the molten metal enter the slag cavity along with the molten metal, forming a "slag part" integrated with the casting, thereby ensuring the quality of the casting itself.

[0004] However, existing exhaust and slag removal structures have three major problems:

[0005] First, the efficiency of slag component breakage is low. Existing slag components are mostly "long strips" or "blocks," with a smooth transition at the connection point with the casting. After mold opening, the slag components must be manually broken or knocked off the casting end using tools such as pliers and chisels, taking 20-40 seconds per piece. Taking an automotive gearbox housing production line as an example, a single line producing 60 castings per hour requires 3-4 workers specifically for handling slag components, with an average daily processing time exceeding 8 hours. This is inefficient and prone to causing deformation at the casting end due to improper operation (deformation rate approximately 3%).

[0006] Second, the fracture location is uncontrollable. Because the connection strength between the slag and the casting is uniform, "fracture location deviation" is likely to occur during artificial fracture. If the fracture location penetrates deep into the casting body, additional grinding and repair are required (adding 5-8 seconds of processing time per piece). If the fracture location remains on the slag, it will result in a "protrusion" remaining at the end of the casting, affecting subsequent assembly (such as leakage when mating with seals).

[0007] Third, the cavities of molded parts are prone to clogging. Most existing molded parts cavities are "single-channel type", with a large contact area between the molded parts and the cavity wall. When the mold is opened, the molded parts are prone to sticking to the cavity. They need to be cleaned manually with ejector pins or air guns. Each cleaning requires a 1-2 minute shutdown, resulting in a 5%-8% decrease in production line utilization. Summary of the Invention

[0008] This invention overcomes the shortcomings of the prior art by providing a venting and slag removal structure, a mold opening structure, and a mold opening method for a die casting mold, thereby solving the problems existing in the prior art.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a venting and slag removal structure for a die-casting mold, wherein the die-casting mold is provided with a casting cavity and a slag cavity, and after the molten metal enters the casting cavity and the slag cavity, a casting and a slag are formed in the casting cavity and the slag cavity respectively, the casting and the slag are integrally formed, the slag includes a front part, a first rear part and a second rear part, the front part is formed at the end of the casting, the first rear part and the second rear part are both formed at the other end of the front part, the first rear part and the second rear part are arranged opposite to each other on the end side of the front part, and a stepped structure is formed at the connection position between the first rear part and the front part and at the connection position between the second rear part and the front part, the location of the stepped structure is the fracture position of the slag.

[0010] In a preferred embodiment of the present invention, the front part is a semi-circular ring structure, and when the slag part is broken, the front part remains at the end of the casting.

[0011] In a preferred embodiment of the present invention, the end face of the first rear portion is fitted with the end face of the front portion to form a first step structure, and the end face of the second rear portion is fitted with the end face of the front portion to form a second step structure.

[0012] In a preferred embodiment of the present invention, the first step structure is the edge portion of the first rear end face protruding from the front end face, and the second step structure is the edge portion of the second rear end face protruding from the front end face. The step height of both the first step structure and the second step structure is 1-2 mm.

[0013] In a preferred embodiment of the present invention, a cavity gap is provided between the first rear portion and the second rear portion.

[0014] In a preferred embodiment of the present invention, an embedding block is provided on both the first rear part and the second rear part. The embedding block is formed in the cavity of the slag part within the side mold insert. When the mold is opened, the side mold insert separates the first rear part and the second rear part from the front part by driving the embedding block.

[0015] This invention also discloses a die-casting mold opening structure for opening the slag part. The mold opening structure includes a first mold opening component and a second mold opening component. The first mold opening component includes a mold opening driver, a mold opening connecting block, and a side mold insert. The cavity of the slag part is located within the side mold insert. The mold opening driver drives the side mold insert through the mold opening connecting block. When the side mold insert opens, the slag part is separated from the casting after being subjected to force. The second mold opening component includes a movable block and a rod-shaped insert. The movable block is located at the rear end of the mold opening connecting block. After the movable block contacts the mold opening connecting block, the mold opening connecting block drives the movable block to open the mold. One end of the rod-shaped insert is fixedly installed in the movable block, and the other end is located in the cavity of the slag part to form the slag part.

[0016] In a preferred embodiment of the present invention, a lower pressing block is further included. The lower pressing block is connected to the upper pressing plate. The lower pressing block is provided with a lower pressing inclined surface, and the movable block is provided with a contact inclined surface. When the die-casting mold is closed, the upper pressing plate drives the lower pressing block. After the lower pressing inclined surface and the contact inclined surface are in contact, the lower pressing block presses down the movable block, so that the end of the rod-shaped insert enters the cavity of the die.

[0017] In a preferred embodiment of the present invention, it further includes two side support seats located on both sides of the movable block. Each side support seat has a limiting cavity, and the movable block has a limiting protrusion on its side. The limiting protrusion moves within the limiting cavity, and the limiting cavity limits the limiting protrusion.

[0018] This invention also discloses a method for opening a die-casting mold, comprising the following steps:

[0019] S1. The die-casting mold opens in the first step. After the upper template drives the lower pressure block to rise, the side mold insert is released from its limit.

[0020] S2. The mold opening driver pulls out the side mold insert through the mold opening connecting block, causing the slag part located in the slag part cavity to break, and the front part of the slag part is left at the end of the casting.

[0021] S3. After the mold opening connecting block and the movable block are attached, the movable block is driven to move. The movable block drives the first rear part and the second rear part of the slag part through the rod-shaped insert, so that the first rear part and the second rear part located in the cavity of the slag part open the mold synchronously with the side mold insert.

[0022] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0023] 1. The present invention provides a venting and slag removal structure, a mold opening structure and a mold opening method for a die casting mold, which can simultaneously break the slag removal part during the mold opening process of the die casting mold. While ensuring the forming effect of the casting, it eliminates the need to spend a lot of time on the casting later, effectively improving the fracture efficiency of the slag part and reducing the consumption of labor costs.

[0024] 2. In this invention, a stepped structure is formed at the connection position between the first rear part and the front part of the slag part and at the connection position between the second rear part and the front part. The presence of this stepped structure is beneficial for the slag part to undergo directional fracture during the mold opening process, avoiding deviation in the fracture position of the slag part, thereby reducing the subsequent labor intensity of the operator.

[0025] 3. In this invention, there is a cavity gap between the first rear part and the second rear part of the slag part. While reducing the weight of the slag part, it avoids the first rear part and the second rear part from squeezing each other when they break, ensuring that the two are subjected to uniform force, effectively improving the synchronization of the first rear part and the second rear part in fracture. In addition, the cavity gap reduces the contact area between the slag part and the slag part cavity by 30%, reducing the risk of adhesion and improving the demolding success rate.

[0026] 4. The mold opening structure of the present invention adopts a two-stage mold opening operation method. The first mold opening component pulls the slag part to break it, and the second mold opening component opens and removes the broken slag part. The slag parts are processed in sequence to improve efficiency.

[0027] 5. The presence of the embedded block in this invention can transmit the driving force of the side mold insert to the rear part of the slag, ensuring that the first rear part and the second rear part can move synchronously with the side mold insert when the mold is opened, thereby generating a fracture force on the slag. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Figure 1 This is a schematic diagram of the overall structure of the die-casting mold according to a preferred embodiment of the present invention;

[0030] Figure 2 This is a partial structural diagram of a die-casting mold according to a preferred embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the casting and slag in a preferred embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the slag component according to a preferred embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the mold opening structure of a preferred embodiment of the present invention;

[0034] Figure 6 for Figure 5 Top view;

[0035] Figure 7 for Figure 6 Enlarged view of section A in the middle;

[0036] Figure 8 for Figure 5 A partial structural diagram;

[0037] In the diagram: 1000, casting cavity; 2000, slag cavity;

[0038] 10. Casting; 20. Slag part; 21. Front part; 22. First rear part; 23. Second rear part; 30. Stepped structure; 40. Cavity gap; 50. Embedded block; 60. Side mold insert; 70. First mold opening assembly; 71. Mold opening driver; 72. Mold opening connecting block; 80. Second mold opening assembly; 81. Movable block; 811. Contact slope; 812. Limiting protrusion; 82. Rod-shaped insert; 90. Lower pressure block; 901. Lower pressure slope; 100. Side support seat; 1001. Limiting cavity; 110. Upper pressure plate. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0040] Example 1

[0041] This embodiment provides a venting and slag removal structure for a die casting mold. In this venting and slag removal structure, a stepped structure 30 is formed at the connection position between the first rear part 22 and the front part 21 of the slag part 20 and at the connection position between the second rear part 23 and the front part 21. The presence of the stepped structure 30 is beneficial for the slag part 20 to undergo directional fracture during the mold opening process, avoiding deviation in the fracture position of the slag part 20, thereby reducing the subsequent labor intensity of the operator.

[0042] Combination Figures 1 to 4As shown, the die-casting mold in this embodiment has a casting cavity 1000 and a slag cavity 2000. After the molten metal enters the casting cavity 1000 and the slag cavity 2000, casting 10 and slag 20 are formed in the casting cavity 1000 and the slag cavity 2000 respectively. Casting 10 and slag 20 are integrally formed. In this embodiment, the slag cavity 2000 is located at the end of the casting cavity 1000 and has an overall Y-shaped design. Its interior is divided into a front cavity, a first rear cavity, and a second rear cavity, which correspond to the front 21, the first rear 22, and the second rear 23 of the slag 20, respectively. The volume of the casting cavity 2000 is 8%-12% of the volume of the casting cavity 1000, ensuring that it can accommodate enough gas and impurities. After the molten metal enters the die-casting mold from the gate, it is pushed by the injection cylinder to first fill the bottom of the casting cavity 1000 and gradually rises upward, squeezing the gas in the casting cavity 1000 to the end. Then the molten metal flows into the slag cavity 2000 through the transition channel. The gas and oxide slag enter the slag cavity 2000 with the molten metal, and finally the casting 10 is formed in the casting cavity 1000, and the slag 20 is formed integrally with the casting 10 in the slag cavity 2000.

[0043] In this embodiment, the slag part 20 includes a front part 21, a first rear part 22, and a second rear part 23. The front part 21 is formed at the end of the casting 10, and the first rear part 22 and the second rear part 23 are both formed at the other end of the front part 21. The first rear part 22 and the second rear part 23 are arranged opposite to each other on the end side of the front part 21. A step structure 30 is formed at the connection position between the first rear part 22 and the front part 21 and at the connection position between the second rear part 23 and the front part 21. The location of the step structure 30 is the fracture position of the slag part 20. In this embodiment, the slag part 20 is divided into three sections: the front part 21, the first rear part 22, and the second rear part 23. A step structure 30 is designed at the connection position between the front part 21 and the first rear part 22 and the front part 21 and the second rear part 23. The step structure 30 forms a stress concentration area. When the mold is opened, the stress is concentrated at the step, so that the slag part 20 automatically breaks during the mold opening process without manual intervention.

[0044] Specifically, the end face of the first rear part 22 is fitted with the end face of the front part 21 to form a first step structure 30, and the end face of the second rear part 23 is fitted with the end face of the front part 21 to form a second step structure 30. The first step structure 30 is the edge portion of the end face of the first rear part 22 that protrudes from the end face of the front part 21, and the second step structure 30 is the edge portion of the end face of the second rear part 23 that protrudes from the end face of the front part 21. The step height of both the first step structure 30 and the second step structure 30 is 1-2mm. In this embodiment, the first step structure 30 and the second step structure 30 are symmetrically distributed. The end face of the first rear part 22 is fitted with the end face of the front part 21 to form a step structure, that is, the end face of the first rear part 22 (the side closer to the front part) and the end face of the front part 21 (the side farther from the casting) partially overlap, and the overlapping area forms a raised step. The second step structure 30 is formed in the same way as above.

[0045] In this embodiment, the step height h (height of the protruding part) is 1-2 mm, and the step width w (width of the protruding part) is 3-5 mm. Finite element stress analysis revealed that when h=1.5 mm and w=4 mm, the stress concentration factor (the ratio of maximum stress to average stress) at the step reaches 3.2, which is much higher than other parts (stress concentration factor ≤1.5). At this time, the fracture force only needs to be 1.8-2.0 kN to achieve precise fracture of the slag part 20 without causing deformation of the front part 21 or the casting 10.

[0046] In this embodiment, the front part 21 is a semi-circular ring structure. After the slag part 20 is broken, the front part 21 remains at the end of the casting 10. The semi-circular ring structure of the front part 21 in this embodiment can reduce the contact area between the front part 21 and the slag part cavity 2000 (50% less than a circular ring), avoiding the front part 21 sticking to the cavity when the mold is opened. On the other hand, the semi-circular ring structure can form an "annular exhaust channel", allowing gas to enter the rear of the slag part 20 evenly and avoiding local gas accumulation. The front part 21 is integrally formed with the end of the casting 10 and is the transition connection section between the slag part 20 and the casting 10. After the slag part 20 is broken after mold opening, the front part 21 remains at the end of the casting 10. It has two functions: first, to protect the surface of the end of the casting 10 and avoid metal splashing or deformation of the end of the casting 10 when it breaks; second, to facilitate the subsequent cleaning of the casting 10. The ring structure of the front part 21 can be ground in one go using a centerless grinder, reducing labor costs.

[0047] Furthermore, in this embodiment, both the first rear portion 22 and the second rear portion 23 are cuboid in shape, symmetrically distributed on the end side of the front portion 21 (i.e., arranged radially opposite to each other along the front portion 21). To improve the venting effect, venting grooves are provided on the top of both the first rear portion 22 and the second rear portion 23, communicating with the main venting groove of the mold to ensure that the gas in the cavity can be quickly discharged. An insert block 50 is provided on both the first rear portion 22 and the second rear portion 23. The insert block 50 is formed within the slag cavity 2000 of the side mold insert 60. When the mold opens, the side mold insert 60, by driving the insert block 50, separates the first rear portion 22 and the second rear portion 23 from the front portion 21. In the embodiment, the coaxiality error between the axis of the embedded block 50 and the movement direction (i.e., the horizontal direction) of the side mold insert 60 is less than 0.02 mm. Otherwise, it will cause uneven stress on the rear part of the slag piece 20 and result in unilateral fracture. The first rear part 22 and the second rear part 23 serve as the main venting and slag discharge areas. Due to their lower density, oxide slag and impurities in the molten metal will preferentially accumulate in the first rear part 22 and the second rear part 23. At the same time, the first rear part 22 and the second rear part 23 serve as the force carriers during mold opening. They are connected to the side mold insert 60 through the embedded block 50. Under the pull of the side mold insert 60, a fracture force is generated, causing the slag piece 20 to fracture along the stepped structure 30.

[0048] like Figure 4 As shown, in this embodiment, there is a cavity gap 40 between the first rear part 22 and the second rear part 23. The cavity gap is distributed along the axial direction of the slag part 20. While reducing the weight of the slag part 20, the cavity gap prevents the first rear part 22 and the second rear part 23 from squeezing each other during fracture, ensuring that the two are subjected to uniform force, effectively improving the fracture synchronization of the first rear part 22 and the second rear part 23. In addition, the cavity gap 40 reduces the contact area between the slag part 20 and the slag part cavity 2000 by 30%, reducing the risk of adhesion and improving the demolding success rate.

[0049] In this embodiment, the slag mold cavity 2000 is equipped with multiple venting mechanisms. The slag mold cavity 2000 is divided into a front cavity, a first rear cavity, and a second rear cavity. A main venting groove is formed at the top of the first and second rear cavities and is connected to the venting insert of the mold. An auxiliary venting groove is formed on the inner sidewall of the front cavity to guide the gas in the front cavity to the main venting groove. An venting plug is set at the end of the slag mold cavity 2000 and is connected to the vacuum system outside the mold to actively extract the gas in the cavity during the die casting process. Through the multi-venting structure design, the gas discharge rate in the slag mold cavity 2000 is effectively improved, the bubble defects inside the slag 20 are reduced, and the venting of the casting cavity 1000 is guaranteed.

[0050] In practical use, the venting and slag removal structure of this embodiment, through the coordinated design of the three-section slag component 20 structure (front part 21, first rear part 22, second rear part 23) and the directional stress concentration steps (first step structure 30, second step structure 30), completely solves the problems of low fracture efficiency, high defect rate and high cost of the existing venting and slag removal structure of die casting molds. It achieves the goals of immediate fracture upon mold opening, precise fracture and efficient slag removal. In applications in the automotive, electronics and other fields, this structure can significantly improve the quality of castings 10, increase production efficiency and reduce production costs, and has extremely high industrialization value.

[0051] Example 2

[0052] Combination Figures 1 to 8 As shown, this embodiment provides a die-casting mold opening structure for opening the slag part 20. The mold opening structure includes a first mold opening component 70 and a second mold opening component 80. First, the first mold opening component 70 pulls the slag part 20 to break, and then the second mold opening component 80 drives the rear of the broken slag part 20 to be demolded, so that the processing of the slag part 20 and the mold opening are completed simultaneously.

[0053] In this embodiment, the first mold opening assembly 70 includes a mold opening driver 71, a mold opening connecting block 72, and a side mold insert 60. The slag cavity 2000 is located within the side mold insert 60. The mold opening driver 71 drives the side mold insert 60 through the mold opening connecting block 72. When the side mold insert 60 opens, the slag 20 is disengaged from the casting 10 under force. The second mold opening assembly 80 includes a movable block 81 and a rod-shaped insert 82. The movable block 81 is located at the rear end of the mold opening connecting block 72. After the movable block 81 contacts the mold opening connecting block 72, the mold opening connecting block 72 drives the movable block 81 to open the mold. One end of the rod-shaped insert 82 is fixedly installed inside the movable block 81, and the other end is located inside the slag cavity 2000. To form the slag part 20, a hydraulic cylinder is used as the mold opening driver 71 in this embodiment. It has a stable and controllable driving force to ensure the precise movement speed and displacement of the side mold insert 60. The mold opening connecting block 72 of the first mold opening assembly 70 transmits the thrust of the mold opening driver 71 to the side mold insert 60 and drives the movable block 81 to move in the later stage of mold opening. Before the mold opening connecting block 72 contacts the movable block 81, it pulls the slag part 20 to break by pulling the side mold insert 60. Then the mold opening connecting block 72 continuously pushes the movable block 81. During the movement, the movable block 81 drives the rod-shaped insert 82 to move. During the movement, the rod-shaped insert 82 drives the broken slag part 20 to demold.

[0054] Furthermore, the mold opening structure of this embodiment also includes a lower pressure block 90, which is connected to the upper pressure plate 110. The lower pressure block 90 is provided with a lower pressure inclined surface 901, and the movable block 81 is provided with a contact inclined surface 811. When the die-casting mold is closed, the upper pressure plate 110 drives the lower pressure block 90. ​​After the lower pressure inclined surface 901 and the contact inclined surface 811 are in contact, the lower pressure block 90 presses down the movable block 81, so that the end of the rod-shaped insert 82 enters the slag cavity 2000. In this embodiment, the presence of the lower pressure block 90 can press the movable block 81 down to a designated position when the mold is closed, ensuring that the front part of the rod-shaped insert 82 accurately enters the slag cavity 2000 so as to form the slag 20 in the subsequent die-casting process. In addition, the lower pressure block 90 can prevent the rod-shaped insert 82 from colliding with the side mold insert 60 when the mold is closed.

[0055] Specifically, in this embodiment, the lower pressure block 90 converts the vertical movement of the upper pressure plate 110 into the vertical movement of the movable block 81 through the inclined plane transmission. The upper pressure plate 110 is fixed on the upper template of the die-casting machine and moves synchronously with the upper template, driving the lower pressure block 90 to achieve mold closing and pressing down, and mold opening and rising.

[0056] In this embodiment, the mold opening structure also includes two side support seats 100 located on both sides of the movable block 81. Each side support seat 100 has a limiting cavity 1001, and the movable block 81 has a limiting protrusion 812 on its side. The limiting protrusion 812 moves within the limiting cavity 1001, which limits the limiting protrusion 812. In this embodiment, the side support seats 100 can limit the maximum stroke of the movable block 81 while installing the first mold opening assembly 70 and the second mold opening assembly 80. When the movable block 81 reaches its maximum stroke, it indicates that the mold opening is complete.

[0057] In actual use, the mold opening structure of this embodiment is such that the first mold opening component 70 pulls the slag part 20 to break, and then the second mold opening component 80 drives the rear of the broken slag part 20 to be demolded, so that the processing of the slag part 20 and the mold opening are completed simultaneously.

[0058] Example 3

[0059] This embodiment provides a method for opening a die-casting mold, including the following steps:

[0060] S1. The die-casting mold opens in the first step. After the upper template drives the lower pressure block 90 to rise, the side mold insert 60 is released from the limit. At this time, both the casting 10 and the slag part 20 have been formed.

[0061] S2. The mold opening driver 71 pulls out the side mold insert 60 through the mold opening connecting block 72, causing the slag 20 located in the slag cavity 2000 to break. The front part 21 of the slag 20 remains at the end of the casting 10. The mold opening driver 71 of the first mold opening assembly 70 pulls out the side mold insert 60 through the mold opening connecting block 72. The pulled-out side mold insert 60 causes the slag 20 to break at the position of the stepped structure 30. The front part 21 of the slag 20 remains at the end of the casting 10, while the first rear part 22 and the second rear part 23 of the slag 20 are located in the slag cavity 2000 and move with the side mold insert 60.

[0062] S3. After the mold opening connecting block 72 is attached to the movable block 81, it drives the movable block 81 to move. The movable block 81 drives the first rear part 22 and the second rear part 23 of the slag part 20 through the rod-shaped insert 82, so that the first rear part 22 and the second rear part 23 located in the slag part cavity 2000 open the mold synchronously with the side mold insert 60 until the movable block 81 reaches the maximum stroke, which indicates that the mold opening is completed.

[0063] The mold opening method in this embodiment adopts a two-stage mold opening operation. The first mold opening component 70 pulls the slag part 20 to break it, and the second mold opening component 80 opens the mold and takes out the broken slag part 20. The slag part 20 is processed in sequence to improve efficiency.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A venting and slag removal structure for a die-casting mold, wherein the die-casting mold is provided with a casting cavity (1000) and a slag cavity (2000), after molten metal enters the casting cavity (1000) and the slag cavity (2000), a casting (10) and a slag (20) are formed respectively in the casting cavity (1000) and the slag cavity (2000), wherein the casting (10) and the slag (20) are integrally formed, characterized in that, The slag component (20) includes a front part (21), a first rear part (22), and a second rear part (23). The front part (21) is formed at the end of the casting (10). The first rear part (22) and the second rear part (23) are both formed at the other end of the front part (21). The first rear part (22) and the second rear part (23) are arranged opposite to each other on the end side of the front part (21). A stepped structure (30) is formed at the connection position between the first rear part (22) and the front part (21) and at the connection position between the second rear part (23) and the front part (21). The location of the stepped structure (30) is the fracture position of the slag component (20).

2. The venting and slag removal structure of a die-casting mold according to claim 1, characterized in that, The front part (21) is a semi-circular ring structure. When the slag part (20) is broken, the front part (21) remains at the end of the casting (10).

3. The venting and slag removal structure of a die-casting mold according to claim 1, characterized in that, The end face of the first rear part (22) is fitted with the end face of the front part (21) to form a first step structure (30), and the end face of the second rear part (23) is fitted with the end face of the front part (21) to form a second step structure (30).

4. The venting and slag removal structure of a die-casting mold according to claim 3, characterized in that, The first step structure (30) is the edge portion of the first rear part (22) end face that protrudes from the front part (21) end face, and the second step structure (30) is the edge portion of the second rear part (23) end face that protrudes from the front part (21) end face. The step height of the first step structure (30) and the second step structure (30) is 1-2mm.

5. The venting and slag removal structure of a die-casting mold according to claim 1, characterized in that, There is a cavity gap (40) between the first rear part (22) and the second rear part (23).

6. The venting and slag removal structure of a die-casting mold according to claim 1, characterized in that, Both the first rear part (22) and the second rear part (23) are provided with an embedded block (50). The embedded block (50) is formed in the slag cavity (2000) inside the side mold insert (60). When the mold is opened, the side mold insert (60) drives the embedded block (50) to separate the first rear part (22) and the second rear part (23) from the front part (21).

7. A mold opening structure for a die-casting mold, applied to the venting and slag-removing structure of a die-casting mold according to any one of claims 1-6, for opening the slag part (20), characterized in that, The mold opening structure includes a first mold opening assembly (70) and a second mold opening assembly (80). The first mold opening assembly (70) includes a mold opening driver (71), a mold opening connecting block (72), and a side mold insert (60). The slag cavity (2000) is located inside the side mold insert (60). The mold opening driver (71) drives the side mold insert (60) through the mold opening connecting block (72). When the side mold insert (60) opens, the slag (20) is subjected to force and interacts with the casting (10). The second mold opening assembly (80) is disconnected. It includes a movable block (81) and a rod-shaped insert (82). The movable block (81) is located at the rear end of the mold opening connecting block (72). After the movable block (81) contacts the mold opening connecting block (72), the mold opening connecting block (72) drives the movable block (81) to open the mold. One end of the rod-shaped insert (82) is fixedly installed in the movable block (81), and the other end is located in the slag part cavity (2000) to form the slag part (20).

8. The mold opening structure of a die-casting mold according to claim 7, characterized in that, It also includes a lower pressure block (90), which is connected to the upper pressure plate (110). The lower pressure block (90) is provided with a lower pressure inclined surface (901), and the movable block (81) is provided with a contact inclined surface (811). When the die-casting mold is closed, the upper pressure plate (110) drives the lower pressure block (90). After the lower pressure inclined surface (901) and the contact inclined surface (811) are in contact, the lower pressure block (90) presses down the movable block (81), so that the end of the rod-shaped insert (82) enters the slag cavity (2000).

9. The mold opening structure of a die-casting mold according to claim 7, characterized in that, It also includes two side support seats (100) located on both sides of the movable block (81). Each side support seat (100) has a limiting cavity (1001). The movable block (81) has a limiting protrusion (812) on its side. The limiting protrusion (812) moves within the limiting cavity (1001), and the limiting cavity (1001) limits the limiting protrusion (812).

10. A method for opening a die-casting mold, applied to the mold opening structure of a die-casting mold according to any one of claims 7-9, characterized in that, Includes the following steps: S1. The die-casting mold is opened in the first step. After the upper template drives the lower pressure block (90) to rise, the side mold insert (60) is released from the limit. S2. The mold opening driver (71) pulls out the side mold insert (60) through the mold opening connecting block (72), causing the slag (20) located in the slag cavity (2000) to break, and the front part (21) of the slag (20) remains at the end of the casting (10). S3. After the mold opening connecting block (72) and the movable block (81) are attached, the movable block (81) is driven to move. The movable block (81) drives the first rear part (22) and the second rear part (23) of the slag part (20) through the rod-shaped insert (82), so that the first rear part (22) and the second rear part (23) located in the slag part cavity (2000) open the mold synchronously with the side mold insert (60).

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