Vacuum pumping and exhausting mechanism in die-casting die cavity and die-casting device

Abstract

The vacuumizing and exhausting mechanism in the die-casting die cavity comprises a movable die exhausting tip and a fixed die exhausting tip which are coaxially arranged in the contact face of a movable die core and a fixed die frame, an exhausting cavity formed between the movable die exhausting tip and the fixed die exhausting tip is a hollow cylinder, and the exhausting cavity is communicated with a casting cavity formed between the movable die core and the fixed die core; the vacuum tube sequentially and coaxially penetrates through the movable mold frame, the movable mold core and / or the movable mold exhaust pin, the vacuum tube is a hollow cylinder with two open ends, one port of the vacuum tube is communicated with the exhaust cavity, and the other port of the vacuum tube is externally connected with a gas collection mechanism. Through reasonable arrangement of component structures, the exhaust mechanism is ingeniously arranged in a cavity for a die casting of a special structure and used for exhausting cold dirty molten metal collected at the filling tail end and exhausting residual gas at the filling tail end in the die casting process, the overall structural design is ingenious and easy to implement, the residual gas at the filling tail end in the die casting process is exhausted, and the die casting efficiency is improved. Installation, replacement and maintenance are convenient, and good application and popularization values are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of die-casting molds, and particularly relates to an in-cavity vacuum exhaust mechanism for a die-casting mold and a die-casting device. Background Technique

[0002] High-pressure casting is a casting method in which molten metal liquid is filled into a die-casting mold cavity at an extremely high speed and cooled and solidified under high pressure to obtain a casting. The exhaust channel of a high-pressure casting mold is the channel through which the gas in the mold cavity escapes during the filling process of the aluminum liquid. An excellent overflow system design plays a decisive role in removing the residual gas and cold and contaminated metal liquid in the mold cavity. Generally, the exhaust plate of a die-casting mold is only arranged on the main parting surface, that is, the surface where the moving die part contacts the fixed die part, and its shape is usually a planar structure. However, due to the special volume and structure of some die-castings, the gas at some local positions of the die-castings cannot be discharged from the mold cavity smoothly. These residual gases will be uniformly dispersed and left inside the die-castings under the action of high pressure. Therefore, the limitations of the traditional exhaust structure gradually emerge. No matter how the casting system is arranged, there is always a situation of air entrapment at the filling end of some die-castings, and the use of ordinary exhaust plates can no longer meet the internal quality requirements of the castings. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the utility model is to provide an in-cavity vacuum exhaust mechanism for a die-casting mold and a die-casting device to solve the problem of air entrapment at the filling end of existing die-castings.

[0004] To achieve the above purpose, the technical solutions adopted by the utility model include:

[0005] An in-cavity vacuum exhaust mechanism for a die-casting mold includes a moving die exhaust pin and a fixed die exhaust pin coaxially arranged in the contact surface between the moving die core and the fixed die frame. The exhaust cavity formed between the moving die exhaust pin and the fixed die exhaust pin is a hollow cylinder, and the exhaust cavity is communicated with the casting cavity formed between the moving die core and the fixed die core; it also includes a vacuum tube sequentially and coaxially penetrating through the moving die frame, the moving die core and / or the moving die exhaust pin. The vacuum tube is a hollow cylinder with both ends open. One end of the vacuum tube is communicated with the exhaust cavity, and the other end of the vacuum tube is externally connected to a gas collecting mechanism.

[0006] Preferably, the radial cross-section of the exhaust cavity gradually increases from one end to the other end, and the axial cross-section of the exhaust cavity is a pagoda structure.

[0007] Preferably, the other end of the exhaust cavity is communicated with the casting cavity, and one end of the exhaust cavity is communicated with one end port of the vacuum tube.

[0008] Preferably, it further includes a vacuum rod with both ends open and a hollow interior. The vacuum rod is coaxially arranged between one end of the exhaust cavity and one end port of the vacuum tube and communicates the exhaust cavity with the inner cavity of the vacuum tube, and a filter screen is arranged in the inner cavity of the vacuum rod.

[0009] A die-casting device includes a moving die frame and a fixed die frame arranged coaxially. Inside the contact surfaces of the moving die frame and the fixed die frame, a moving die core and a fixed die core are respectively arranged coaxially. There is a casting cavity left coaxially between the moving die core and the fixed die core. It also includes a casting mechanism and a gas-collecting mechanism connected to the casting cavity, and further includes an exhaust mechanism, and the exhaust mechanism is a vacuum exhaust mechanism for the die-casting mold cavity disclosed in this application.

[0010] Preferably, at least one water inlet and one water outlet communicating with the exhaust cavity are provided at one end of the fixed die exhaust nozzle, and a circulating cooling mechanism is connected outside the water inlet and the water outlet.

[0011] Preferably, it further includes a quick-change ejection mechanism. The quick-change ejection mechanism includes a quick-change rod coaxially arranged inside the moving die frame and having one end abutted against the moving die exhaust nozzle. The contact surface between the quick-change rod and the moving die exhaust nozzle is not larger than the other end surface of the moving die exhaust nozzle, and a quick-change pressing plate is pressed at the other end of the quick-change rod.

[0012] Preferably, the quick-change ejection mechanism further includes a push plate and a limit plate coaxially arranged outside the moving die frame. At least two push rods are evenly arranged circumferentially on the limit plate. One end of the push rod is fixedly arranged on the limit plate, and the other end of the push rod sequentially penetrates the moving die frame, the moving die core and the moving die exhaust nozzle and contacts the other end of the exhaust cavity.

[0013] Preferably, two push rods are evenly arranged circumferentially on the limit plate.

[0014] Preferably, the other port of the vacuum tube is connected with a vacuum joint, and a hose is arranged between the gas-collecting mechanism and the vacuum joint.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] (1) The vacuum exhaust mechanism for the die-casting mold cavity of the present utility model, through reasonable setting of the component structure, cleverly arranges the exhaust mechanism inside the cavity for special-structured die-castings to remove the cold and contaminated molten metal liquid gathered at the filling end, and remove the residual gas at the filling end during die-casting. The overall structure design is ingenious and easy to implement, removes the residual gas at the filling end during die-casting, is convenient for installation, replacement, maintenance and repair, and has good application and popularization value.

[0017] (2) The die-casting device of the present utility model, through reasonable setting of the component structure, the casting mechanism pours molten metal liquid into the casting cavity, obtains vacuum power through the gas-collecting mechanism connected to an external vacuum machine, and removes the residual gas at the filling end during die-casting through the exhaust mechanism.

[0018] (3) The die-casting device of the present utility model, through reasonable setting of the component structure, the circulating cooling mechanism circulates and injects cooling water into the exhaust cavity to ensure that the molten metal liquid quickly cools and solidifies in the exhaust cavity, avoiding the situation of blockage of the vacuum port in the exhaust channel entering the vacuum tube.

[0019] (4) The die-casting device of the present utility model realizes the rapid replacement of the moving die exhaust vent through reasonable setting of the component structure, and pushes out the molten metal liquid cooled and solidified in the exhaust cavity after the casting is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0021] Figure 1 is a schematic structural diagram of the vacuum exhaust mechanism and die-casting device in the die-casting mold cavity of the present utility model;

[0022] Figure 2 is Figure 1 an exploded view of;

[0023] Figure 3 is Figure 1 a schematic structural diagram of the fixed die exhaust vent in;

[0024] Each label in the figure represents:

[0025] A moving die frame, B moving die core, C fixed die frame, D fixed die core, E casting cavity, F exhaust mechanism, G quick-change pushing mechanism, H casting mechanism, I vacuum joint, J hose, K gas collection mechanism;

[0026] 1 moving die exhaust vent, 2 fixed die exhaust vent, 21 water inlet, 22 water outlet, 3 exhaust cavity, 4 vacuum rod, 5 vacuum tube, 7 filter screen;

[0027] G1 push plate, G2 limit plate, G3 push rod, G4 quick-change rod, G5 quick-change pressure plate. SPECIFIC EMBODIMENTS

[0028] The present utility model is not limited to the following specific embodiments. Any equivalent transformation made on the basis of the technical solution of this application falls within the protection scope of the present utility model.

[0029] It should be noted that the directional terms mentioned herein, such as "inner cavity", "inner circumference", "inner wall" and "outer side", etc., are all consistent with the specific directions on the paper surface of the specification drawings or the corresponding directions in the space shown in the drawings; all components and devices in the present utility model, unless otherwise specified, are all components and devices known in the prior art.

[0030] Embodiment 1

[0031] This embodiment discloses a vacuum exhaust mechanism inside a die-casting mold cavity, which includes a moving die exhaust pin 1 and a fixed die exhaust pin 2 coaxially arranged within the contact surface between the moving die core B and the fixed die frame C. The exhaust cavity 3 formed between the moving die exhaust pin 1 and the fixed die exhaust pin 2 is a hollow cylinder, and the exhaust cavity 3 communicates with the casting cavity E formed between the moving die core B and the fixed die core D. It also includes a vacuum tube 5 coaxially passing through the moving die frame A, the moving die core B, and / or the moving die exhaust pin 1 in sequence. The vacuum tube 5 is a hollow cylinder with both ends open. One port of the vacuum tube 5 communicates with the exhaust cavity 3, and the other port of the vacuum tube 5 is externally connected to a gas collection mechanism K;

[0032] Its functions are as follows: The moving die exhaust pin 1 and the fixed die exhaust pin 2 are respectively arranged on the corresponding inlay grooves of the moving die core B and the fixed die frame C. The exhaust cavity 3 formed by the moving die exhaust pin 1 and the fixed die exhaust pin 2 communicates with the casting cavity E. During the die-casting process, the molten metal liquid flows into the exhaust cavity 3, enabling the gas at the filling end of the die-casting to be discharged into the exhaust cavity 3 together, and the exhaust is sent out through the vacuum tube 5. For die-castings with special structures, the exhaust mechanism is ingeniously arranged inside the cavity to remove the cold and contaminated metal liquid gathered at the filling end and the residual gas at the filling end during the die-casting process. The overall structure design is ingenious and easy to implement, removing the residual gas at the filling end during the die-casting process, being convenient for installation, replacement, and maintenance, and having good application and popularization value.

[0033] In this embodiment, the radial cross-section of the exhaust cavity 3 gradually increases from one end to the other end, and the axial cross-section of the exhaust cavity 3 is a pagoda structure; the other end of the exhaust cavity 3 communicates with the casting cavity E, and one end of the exhaust cavity 3 communicates with one port of the vacuum tube 5.

[0034] This embodiment also includes a vacuum rod 4 that is hollow with both ends open. The vacuum rod 4 is coaxially arranged between one end of the exhaust cavity 3 and one port of the vacuum tube 5 to connect the inner cavities of the exhaust cavity 3 and the vacuum tube 5, and a filter screen 7 is provided inside the inner cavity of the vacuum rod 4;

[0035] Its functions are as follows: The filter screen 7 is press-fitted and embedded in the vacuum rod 4 to filter impurities in the cavity and prevent the vacuum rod 4 from being blocked during the exhaust process.

[0036] Embodiment 2

[0037] This embodiment discloses a die-casting device, which includes a moving die frame A and a fixed die frame C arranged coaxially. Inside the contact surface of the moving die frame A and the fixed die frame C, a moving die core B and a fixed die core D are respectively arranged coaxially. A casting cavity E is left coaxially between the moving die core B and the fixed die core D. It also includes a casting mechanism H and a gas collection mechanism K connected to the casting cavity E, and an exhaust mechanism F. The exhaust mechanism F is the vacuum exhaust mechanism inside the die-casting mold cavity disclosed in Embodiment 1;

[0038] Its functions are as follows: The casting mechanism H pours molten metal into the casting cavity E, the gas collecting mechanism K is externally connected to a vacuum machine to provide vacuum power, and the exhaust mechanism F removes the residual gas at the end of filling during die casting. For die castings with special structures, the exhaust mechanism is ingeniously arranged inside the cavity to remove the cold and contaminated metal liquid collected at the end of filling and the residual gas at the end of filling during die casting. The overall structure design is ingenious and easy to implement, removing the residual gas at the end of filling during die casting, being convenient for installation, replacement, maintenance and repair, and having good application and popularization value.

[0039] Another port of the vacuum tube 5 disclosed in this embodiment is connected with a vacuum joint I, and a hose J is arranged between the gas collecting mechanism K and the vacuum joint I. That is, the hose J, the vacuum joint I, the vacuum tube 5 and the vacuum rod 4 are combined together to form the main vacuum channel of this mechanism.

[0040] Specifically, at least one water inlet 21 and one water outlet 22 communicated with the exhaust cavity 3 are arranged at one end of the fixed die exhaust pin 2, and the water inlet 21 and the water outlet 22 are externally connected with a circulating cooling mechanism;

[0041] Its functions are as follows: The circulating cooling mechanism circulates and injects cooling water into the exhaust cavity 3 inside the water inlet 21 and the water outlet 22 to ensure that the molten metal quickly cools and solidifies in the exhaust cavity 3, avoiding the occurrence of vacuum port blockage in the exhaust channel inside the vacuum tube 5.

[0042] The die-casting device disclosed in this embodiment further includes a quick-change ejection mechanism G. The quick-change ejection mechanism G includes a quick-change rod G4 coaxially arranged inside the moving die frame A and having one end abutted against the moving die exhaust pin 1. The contact surface between the quick-change rod G4 and the moving die exhaust pin 1 is not larger than the other end surface of the moving die exhaust pin 1, and the other end of the quick-change rod G4 presses a quick-change pressing plate G5; When it is necessary to replace the moving die exhaust pin 1, it is ejected by the quick-change rod G4 to achieve quick replacement.

[0043] The quick-change ejection mechanism G disclosed in this embodiment further includes a push plate G1 and a limit plate G2 coaxially arranged outside the moving die frame A. Two push rods G3 are evenly arranged circumferentially on the limit plate G2. One end of the push rod G3 is fixedly arranged on the limit plate G2, and the other end of the push rod G3 sequentially penetrates the moving die frame A, the moving die core B and the moving die exhaust pin 1 and contacts the other end of the exhaust cavity 3.

[0044] The specific implementation process of the die-casting device in this embodiment is mainly divided into the following two stages:

[0045] The first stage: Under the action of the die-casting machine, the moving die and the fixed die are closed, and the injection is about to start. When the punch passes through the pouring port of the barrel, at this time, the casting cavity E and the exhaust cavity 3 of the casting form a closed space. Then the vacuum system is started, the vacuum interface channel is opened, and the backflush interface is closed. The gas in the cavity passes through the exhaust cavity 3 in the figure, filters impurities through the filter screen 7, and is evacuated through the vacuum rod 4, the vacuum tube 5, the vacuum joint I, and the hose J. During the vacuum evacuation process, the cooling mechanism operates simultaneously. The cooling system of this mechanism is arranged on the fixed die side. The fixed die exhaust port 2 contains a circulating cooling water path, which rapidly cools the molten metal at the filling front end during the filling process of the molten metal.

[0046] The second stage: After the casting is formed, the mold is opened, and the moving die and the fixed die are in a separated state. In this stage, the backflush process and the ejection process are carried out simultaneously. The backflush interface of the external vacuum machine is opened, and the gas moves in the opposite direction to that in the first stage, blowing the impurities attached to the filter screen 7 to the mold closing area. The molten metal cooled and solidified in the exhaust cavity 3 is smoothly separated from the surface of the moving die core B in the figure under the action of the push rod G3, thus completing the entire cycle.

[0047] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable way without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0049] Furthermore, any combination can be made between the various different embodiments disclosed in this solution as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content invented by the present disclosure.

Claims

1. A vacuum exhaust mechanism for die-casting mold cavity, characterized in that It includes a moving die exhaust pin (1) and a fixed die exhaust pin (2) coaxially arranged within the contact surfaces of the moving die core (B) and the fixed die frame (C). The exhaust cavity (3) formed between the moving die exhaust pin (1) and the fixed die exhaust pin (2) is a hollow cylinder, and the exhaust cavity (3) communicates with the casting cavity (E) formed between the moving die core (B) and the fixed die core (D). It also includes a vacuum tube (5) coaxially penetrating through the moving die frame (A), the moving die core (B), and / or the moving die exhaust pin (1) in sequence. The vacuum tube (5) is a hollow cylinder with both ends open. One port of the vacuum tube (5) communicates with the exhaust cavity (3), and the other port of the vacuum tube (5) is externally connected to a gas collecting mechanism (K).

2. The in-cavity vacuum pumping and exhaust mechanism of the die-casting mold according to claim 1, wherein The radial cross-section of the exhaust cavity (3) gradually increases from one end to the other end, and the axial cross-section of the exhaust cavity (3) is in a pagoda structure.

3. The vacuum exhaust mechanism in the die-casting mold cavity according to claim 2, wherein The other end of the exhaust cavity (3) communicates with the casting cavity (E), and one end of the exhaust cavity (3) communicates with one port of the vacuum tube (5).

4. The in-cavity vacuum exhaust mechanism for die casting molds according to any one of claims 1-3, characterized in that, It also includes a vacuum rod (4) that is hollow with both ends open as a whole. The vacuum rod (4) is coaxially arranged between one end of the exhaust cavity (3) and one port of the vacuum tube (5) to connect the inner cavities of the exhaust cavity (3) and the vacuum tube (5), and a filter screen (7) is provided in the inner cavity of the vacuum rod (4).

5. A die-casting device, comprising a moving die frame (A) and a fixed die frame (C) arranged coaxially. A moving die core (B) and a fixed die core (D) are coaxially arranged in the contact surfaces of the moving die frame (A) and the fixed die frame (C) respectively. A casting cavity (E) is left coaxially between the moving die core (B) and the fixed die core (D). The device further comprises a casting mechanism (H) and a gas-collecting mechanism (K) connected to the casting cavity (E). It is characterized in that, It also includes an exhaust mechanism (F), and the exhaust mechanism (F) is a vacuum exhaust mechanism for evacuating the die casting mold cavity according to any one of claims 1-4.

6. The die-casting device according to claim 5, characterized in that, At least one water inlet (21) and one water outlet (22) that communicate with the exhaust cavity (3) are provided at one end of the fixed die exhaust pin (2). The water inlet (21) and the water outlet (22) are externally connected to a circulating cooling mechanism.

7. The die-casting device according to claim 6, wherein, It also includes a quick-change ejection mechanism (G). The quick-change ejection mechanism (G) includes a quick-change rod (G4) coaxially arranged within the moving die frame (A) and having one end abutted against the moving die exhaust pin (1). The contact surface of the quick-change rod (G4) and the moving die exhaust pin (1) is not larger than the other end surface of the moving die exhaust pin (1), and the other end of the quick-change rod (G4) presses a quick-change pressing plate (G5).

8. The die-casting device according to claim 7, characterized in that, The quick-change ejection mechanism (G) also includes a push plate (G1) and a limiting plate (G2) coaxially arranged outside the moving die frame (A). At least two push rods (G3) are evenly arranged circumferentially on the limiting plate (G2). One end of the push rod (G3) is fixedly arranged on the limiting plate (G2), and the other end of the push rod (G3) sequentially penetrates through the moving die frame (A), the moving die core (B), and the moving die exhaust pin (1) to contact the other end of the exhaust cavity (3).

9. The die-casting device according to claim 8, wherein Two push rods (G3) are evenly arranged circumferentially on the limiting plate (G2).

10. The die-casting device according to any one of claims 5-9, characterized in that, Another port of the vacuum tube (5) is connected with a vacuum joint (I), and a hose (J) is provided between the gas collecting mechanism (K) and the vacuum joint (I).

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