Exhaust quick-change structure of die-casting die

Abstract

The utility model relates to the technical field of die-casting dies, and discloses an exhaust quick-change structure of a die-casting die, which comprises an exhaust pin fixed on a movable die frame, a bushing arranged on a movable die core, an ejection sleeve arranged on the movable die frame and used for ejecting the tail part of the bushing, and a lock sleeve used for tightly ejecting the tail part of the ejection sleeve to fix the ejection sleeve on the movable die frame, the exhaust pin sequentially penetrates through the lock sleeve, the top sleeve and the lining and then is communicated with the cavity, exhaust channels are formed between the exhaust pin and the lock sleeve, between the exhaust pin and the top sleeve and between the exhaust pin and the lining, the head of the lining is communicated with the cavity, and the exhaust pin is fixed on the square iron. According to the exhaust quick-change structure provided by the utility model, the top sleeve and the lock sleeve are matched to fix the bushing, so that the complex processing of forming a threaded hole in the deep position in the movable mold core is avoided, and the mounting and replacing processes are simplified. The bushing can be easily pulled out or inserted only by releasing the fixation of the lock sleeve to the top sleeve, so that the replacement efficiency of the bushing is greatly improved, and the maintenance difficulty and the time cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of die casting moulds, in particular to an exhaust quick-change structure of a die casting mould. Background Art

[0002] Die casting molds are generally equipped with exhaust structures to discharge the gas in the cavity when the aluminum liquid fills the cavity, thereby reducing defects such as pores and bubbles in the casting, thereby improving the quality of the casting.

[0003] The exhaust structure includes an exhaust pin and a bushing sleeved on the outside of the exhaust pin, and an exhaust channel is formed between the bushing and the exhaust pin. On the one hand, the bushing protects the exhaust pin, and the sleeve and the exhaust pin fit tightly, which can effectively prevent the high-temperature molten metal from leaking from the exhaust gap, ensure the constancy of the exhaust gap, and provide a stable exhaust effect. According to the actual production situation, the size and shape of the bushing can be adjusted later to change the width and shape of the exhaust channel. It is only necessary to replace the bushing, without replacing the complex exhaust pin as a whole or making large-scale changes to the mold. However, the bushing is mainly fixed to the movable mold core by threaded matching, that is, a threaded hole matching the bushing is opened on the movable mold core, and an external thread matching the threaded hole is set on the outer wall of the bushing, and then the bushing is inserted into the threaded hole, the position is adjusted by rotation, and the extrusion sleeve is fixed to the movable mold core by threaded fastening or other locking structures. The threaded holes are often opened deep inside the moving mold core, which makes it difficult to tap the threaded holes. In addition, when the bushing needs maintenance and replacement due to wear or product debugging, it is necessary to use special tools to unscrew the bushing, which is difficult, time-consuming and labor-intensive to operate, affecting maintenance efficiency.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide an exhaust quick-change structure which simplifies the installation and replacement process.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A quick-change exhaust structure for a die-casting mold, which is arranged on a movable mold, comprises an exhaust pin fixed on a movable mold frame, a bushing arranged on a movable mold core, a top sleeve arranged on the movable mold frame and used to support the tail of the bushing, and a locking sleeve used to tighten the tail of the top sleeve and fix the top sleeve on the movable mold frame; the exhaust pin passes through the locking sleeve, the top sleeve and the bushing in sequence and then communicates with the cavity, an exhaust channel is formed between the exhaust pin and the locking sleeve, the top sleeve and the bushing, the head of the bushing is communicated with the cavity, and the exhaust pin is fixed on a square iron.

[0008] As a further improvement of the above technical solution, the locking sleeve is a hexagonal embedded nut, a hexagonal through hole is provided at the center of the hexagonal embedded nut, an external thread is provided on the hexagonal embedded nut, and a threaded hole compatible with the external thread of the hexagonal embedded nut is opened on the movable mold frame.

[0009] As a further improvement of the above technical solution, the bushing includes a sleeve portion and a first limiting ring arranged at the rear end of the sleeve portion.

[0010] As a further improvement of the above technical solution, the inner hole of the sleeve portion is provided with an inner arc convex surface at the air inlet, which is in contact with the outer wall of the exhaust pin, and the inner arc convex surfaces are arranged in a circular array.

[0011] As a further improvement of the above technical solution, the top sleeve is a circular tube structure.

[0012] As a further improvement of the above technical solution, the exhaust pin includes a round pin body and a second limiting ring arranged at the rear end of the round pin body.

[0013] Beneficial effects of the utility model: Compared with the prior art, the exhaust quick-change structure provided by the utility model adopts a top sleeve and a locking sleeve to fix the bushing, which avoids the complicated processing of opening a threaded hole deep inside the movable mold core and simplifies the installation and replacement process. The bushing can be easily pulled out or inserted by simply releasing the fixing of the locking sleeve to the top sleeve, which greatly improves the replacement efficiency of the bushing and reduces the maintenance difficulty and time cost. The bushing can adjust the width and shape of the exhaust channel according to actual production needs by quickly replacing bushings of different sizes and shapes to meet different exhaust needs without the need to replace the complex exhaust pin as a whole or make large-scale changes to the mold, thereby enhancing the flexibility of mold use and reducing the cost of mold maintenance and updates. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of the exhaust quick-change structure provided by the utility model.

[0015] Figure 2 This is an exploded view of the exhaust quick-change structure provided by the utility model.

[0016] Figure 3 This is a schematic diagram of the exhaust quick-change structure being arranged on the movable mold core.

[0017] Figure 4 This is a schematic diagram of the exhaust quick-change structure installed on the movable mold frame.

[0018] Figure 5 This is a schematic diagram of the exhaust quick-change structure on the die-casting mold.

[0019] Description of main component symbols: 11-movable mold core, 12-movable mold frame, 13-square iron, 14-movable mold bottom plate, 2-exhaust pin, 21-round pin body, 22-second limiting ring, 3-bushing, 31-sleeve part, 32-first limiting ring, 33-inner arc convex surface, 4-top sleeve, 5-lock sleeve, 6-exhaust channel. DETAILED DESCRIPTION

[0020] The utility model provides a quick exhaust change structure for a die-casting mold. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0021] The movable mold of the die-casting mold includes a movable mold frame 12 , a movable mold core 11 arranged on the movable mold frame 12 , a square iron 13 arranged behind the movable mold frame 12 , and a movable mold bottom plate 14 arranged behind the square iron 13 .

[0022] See also Figure 1-Figure 5 The utility model provides an exhaust quick-change structure of a die-casting mold, which is arranged on a movable mold, and includes an exhaust pin 2 fixed on a movable mold frame 12, a bushing 3 arranged on a movable mold core 11, a top sleeve 4 arranged on the movable mold frame 12 and used to support the tail of the bushing 3, and a locking sleeve 5 used to tighten the tail of the top sleeve 4 and fix the top sleeve 4 on the movable mold frame 12; the exhaust pin 2 passes through the locking sleeve 5, the top sleeve 4 and the bushing 3 in sequence and is connected with the cavity. In other words, the locking sleeve 5, the top sleeve 4 and the bushing 3 are sleeved on the exhaust pin 2, and an exhaust channel 6 is formed between the exhaust pin 2 and the locking sleeve 5, the top sleeve 4 and the bushing 3. The head of the bushing 3 is connected with the cavity, and the exhaust pin 2 is fixed on the square iron 13.

[0023] When the bushing 3 needs to be maintained or replaced, first pull out the exhaust pin 2, then release the locking sleeve 5 from fixing the top sleeve 4, so that the top sleeve 4 can move axially along the exhaust pin 2. Since the top sleeve 4 supports the tail of the bushing 3, after releasing the fixing of the top sleeve 4, the bushing 3 can be easily pulled out from the movable mold core 11 to complete the quick replacement of the bushing 3. When replacing a new or repaired bushing 3, the reverse operation can be performed, inserting the bushing 3 into the movable mold core 11, re-fixing the top sleeve 4 and locking it on the movable mold frame 12 with the locking sleeve 5, and finally reinserting the exhaust pin 2 to restore the normal working state of the entire exhaust quick-change structure.

[0024] During the die casting process, when the aluminum liquid fills the cavity, the gas in the cavity can enter the exhaust channel 6 through the head of the bushing 3. The gas passes through the bushing 3, the top sleeve 4 and the lock sleeve 5 in sequence along the exhaust channel 6, and is finally discharged out of the mold through the part connected to the exhaust pin 2, thereby achieving effective exhaust of the cavity, reducing defects such as pores and bubbles in the casting, and improving the quality of the casting.

[0025] Compared with the prior art, the exhaust quick-change structure provided by the utility model adopts a top sleeve 4 and a locking sleeve 5 to cooperate with the fixing sleeve 3, avoiding the complicated processing of opening a threaded hole deep inside the movable mold core 11, and simplifying the installation and replacement process. The sleeve 3 can be easily pulled out or inserted by simply releasing the fixing of the locking sleeve 5 to the top sleeve 4, which greatly improves the replacement efficiency of the sleeve 3 and reduces the maintenance difficulty and time cost. The sleeve 3 can adjust the width and shape of the exhaust channel 6 according to actual production needs by quickly replacing the sleeve 3 of different sizes and shapes to meet different exhaust needs, without the need to replace the complex exhaust pin 2 as a whole or make large-scale changes to the mold, thereby enhancing the flexibility of mold use and reducing the cost of mold maintenance and renewal.

[0026] Specifically, the locking sleeve 5 is a hexagonal embedded nut, the center of which is provided with a hexagonal through hole, the hexagonal embedded nut is provided with an external thread, and the movable mold frame 12 is provided with a threaded hole that matches the external thread of the hexagonal embedded nut. The hexagonal embedded nut is directly embedded in the movable mold frame 12, and its external thread cooperates with the threaded hole on the movable mold frame 12 to form a stable connection. This embedded design makes the entire exhaust quick-change structure more compact, reduces the occupied space, and is conducive to the overall layout optimization of the mold. At the same time, the threaded connection between the hexagonal embedded nut and the threaded hole has good self-locking performance, which ensures the stable position of the locking sleeve 5 during the working process, avoids loosening due to vibration and other reasons, and ensures the continued effectiveness of the exhaust channel 6. When installing or removing the hexagonal embedded nut, use a hexagonal wrench for quick and accurate screwing operations. Compared with other types of fasteners, the hexagon socket embedded nut has a larger contact area with the wrench and applies force more evenly, making the installation or disassembly process more labor-saving and efficient, further improving the operational convenience of replacing the bushing 3.

[0027] Specifically, the bushing 3 includes a sleeve portion 31 and a first limit ring 32 arranged at the rear end of the sleeve portion 31. The first limit ring 32 can provide a clear stop point for the installation of the bushing 3 on the movable mold core 11, ensuring that the bushing 3 reaches a preset depth when inserted into the movable mold core 11, and realizing precise positioning. This structural design avoids the deflection or blockage of the exhaust channel 6 caused by improper installation, ensures the stability and consistency of the exhaust effect, and is beneficial to improving the quality of the casting. The first limit ring 32 not only plays a positioning role, but also can form an effective seal on the contact surface between the bushing 3 and the movable mold core 11, preventing aluminum liquid or impurities from leaking from the connection between the bushing 3 and the movable mold core 11, further improving the overall sealing performance of the mold, and is beneficial to reducing casting defects and ensuring the quality of castings.

[0028] In addition, the first stop ring 32 is located at the rear end of the bushing 3, which can increase the contact area between the top sleeve 4 and the rear end of the bushing 3, and prevent the top sleeve 4 from causing excessive wear or damage to the bushing 3 during the tightening process. This design prolongs the service life of the bushing 3, reduces maintenance costs, and also ensures the long-term stable operation of the exhaust quick-change structure.

[0029] Furthermore, the inner hole of the sleeve portion 31 is provided with an inner arc convex surface 33 at the air inlet, which is fitted with the outer wall of the exhaust pin 2, and the inner arc convex surface 33 is arranged in a circumferential array. The inner arc convex surface 33 can stabilize and guide the exhaust pin 2 on the one hand, and can guide the gas to flow smoothly along the outer wall of the exhaust pin 2 on the other hand, avoiding eddy current or blockage of the gas at the air inlet, effectively optimizing the gas flow path of the gas entering the exhaust channel 6, improving the gas exhaust efficiency, helping to reduce defects such as pores and bubbles in the casting, and improving the quality of the casting.

[0030] In this embodiment, the top sleeve 4 is a round tube structure. The round tube structure has the smallest fluid resistance coefficient, and when the gas passes through the top sleeve 4, it can flow smoothly, reduce energy loss, and improve exhaust efficiency. In particular, when a small amount of molten metal or condensate may remain inside the top sleeve 4, the round tube structure helps these substances to slide smoothly along the tube wall, reducing the risk of blocking the exhaust channel 6.

[0031] In the present embodiment, the exhaust pin 2 includes a round pin body 21 and a second limiting ring 22 arranged at the rear end of the round pin body 21. The second limiting ring 22 provides a clear stop point for the installation of the exhaust pin 2 on the movable mold frame 12, ensuring that the exhaust pin 2 reaches a preset depth when inserted into the movable mold frame 12, thereby achieving precise positioning. This structural design avoids the deflection or blockage of the exhaust channel 6 due to improper installation, ensures the stability and consistency of the exhaust effect, and is beneficial to improving the quality of the casting. The second limiting ring 22 also forms an effective support on the contact surface between the exhaust pin 2 and the movable mold frame 12, enhances the stability of the exhaust pin 2 during operation, prevents it from being displaced due to vibration or impact, and ensures the continuous smoothness of the exhaust channel 6, which is beneficial to reducing casting defects and ensuring the quality of castings.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. An exhaust quick-change structure for a die-casting mold, the exhaust quick-change structure being arranged on a movable mold, characterized in that: It includes an exhaust pin fixed on the movable mold frame, a bushing arranged on the movable mold core, a top sleeve arranged on the movable mold frame and used to support the tail of the bushing, and a locking sleeve used to tighten the tail of the top sleeve and fix the top sleeve on the movable mold frame; the exhaust pin passes through the locking sleeve, the top sleeve and the bushing in sequence and is connected with the cavity, an exhaust channel is formed between the exhaust pin and the locking sleeve, the top sleeve and the bushing, the head of the bushing is connected with the cavity, and the exhaust pin is fixed on the square iron.

2. The exhaust quick-change structure of the die-casting mold according to claim 1 is characterized in that: The locking sleeve is a hexagonal embedded nut, a hexagonal through hole is provided at the center of the hexagonal embedded nut, an external thread is provided on the hexagonal embedded nut, and a threaded hole matching the external thread of the hexagonal embedded nut is opened on the movable mold frame.

3. The exhaust quick-change structure of the die-casting mold according to claim 1, characterized in that: The bushing comprises a sleeve portion and a first limiting ring arranged at the rear end of the sleeve portion.

4. The exhaust quick-change structure of the die-casting mold according to claim 3 is characterized in that: The inner hole of the sleeve portion is provided with an inner arc convex surface at the air inlet, which is in contact with the outer wall of the exhaust pin, and the inner arc convex surfaces are arranged in a circular array.

5. The exhaust quick-change structure of the die-casting mold according to claim 1, characterized in that: The top sleeve is a round tube structure.

6. The exhaust quick-change structure of the die-casting mold according to claim 1, characterized in that: The exhaust pin comprises a round pin body and a second limiting ring arranged at the rear end of the round pin body.

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