Multi-stage exhaust structure of die-casting die

Abstract

The utility model relates to the technical field of die-casting dies and discloses a multi-stage exhaust structure of a die-casting die, which comprises a movable die core and a cylindrical insert arranged on the movable die core, and an annular end face, an annular groove, a first-stage overflow groove and a second-stage overflow groove are sequentially arranged on the end portion of a cavity of the cylindrical insert from outside to inside. A third-stage overflow groove located on the periphery of the annular deep groove is formed in the movable mold core, a first exhaust hole is formed in the first-stage overflow groove, a second exhaust hole is formed in the second-stage overflow groove, a third exhaust hole is formed in the third-stage overflow groove, and a plurality of fourth exhaust holes are formed in the annular end face. By arranging the multi-stage exhaust structure, the multi-stage overflow grooves and the exhaust holes which are reasonably arranged in the die-casting die, gas in the die is timely and effectively exhausted, and molten aluminum can smoothly flow into and fill a complex tooth position structure, so that the problem of insufficient casting caused by air trapping in a traditional die is solved; all parts of a piston product can be fully filled, and the compactness and integrity of the product are improved.

Description

Technical Field

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

[0002] Due to the complex shape of automobile parts, die-casting molds are usually used for casting. There is a piston product that needs to be manufactured. The piston product is annular and has a tooth structure, but the tooth structure is almost vertical, deep, uneven, and has a large fluctuation. The piston product is prone to air entrapment during the casting process, resulting in the aluminum liquid being unable to fully reach the bottom or deep part of the tooth due to the large flow resistance during the filling process, forming an obvious unfilled area, and air holes are easily generated inside the product, which cannot meet the performance requirements of the product. Therefore, it is necessary to improve the die-casting mold to solve the problem of air entrapment during the casting process and improve the quality of the piston product. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a multi-stage exhaust structure for a die-casting mold, aiming to solve the problem of air entrapment during the casting process and to improve the quality of piston products.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-stage exhaust structure of a die-casting mold comprises a movable mold core and a cylindrical insert arranged on the movable mold core, wherein an annular end face, an annular groove, a first-stage overflow groove and a second-stage overflow groove are sequentially arranged on the cavity end of the cylindrical insert from the outside to the inside, a large hole for the cylindrical insert to be embedded is provided on the movable mold core, an annular deep groove is formed between the inner side wall of the large hole and the outer side wall of the cylindrical insert, a third-stage overflow groove located at the periphery of the annular deep groove is provided on the movable mold core, a first exhaust hole is provided in the first-stage overflow groove, a second exhaust hole is provided in the second-stage overflow groove, a third exhaust hole is provided in the third-stage overflow groove, a plurality of fourth exhaust holes are provided on the annular end face, exhaust pins are provided in the first exhaust hole, the second exhaust hole, the third exhaust hole and the fourth exhaust hole to form an exhaust gap, and the aluminum liquid flowing into the die-casting mold cavity not only flows from the annular deep groove to the annular end face, the annular groove, the first-stage overflow groove and the second-stage overflow groove in sequence, but also flows from the annular deep groove to the third-stage overflow groove.

[0006] As a further improvement of the above technical solution, a plurality of first-stage overflow grooves are provided and are arranged at intervals around the annular groove, and the number of second-stage overflow grooves is the same as the number of first-stage overflow grooves and they are connected one-to-one.

[0007] As a further improvement of the above technical solution, a tail-stage overflow groove is also opened on the end of the cavity of the cylindrical insert, so that the second-stage overflow groove is connected to the tail-stage overflow groove, a fifth exhaust hole is provided in the tail-stage overflow groove, and an exhaust pin is provided in the fifth exhaust hole to form an exhaust gap.

[0008] As a further improvement of the above technical solution, the third-stage overflow grooves are provided in plurality and are arranged at intervals around the annular deep groove.

[0009] As a further improvement of the above technical solution, a first exhaust block is provided on the movable die frame of the die-casting mold, and a second exhaust block matching with the first exhaust block is provided on the fixed die frame of the die-casting mold. The first exhaust block is provided with a wave groove, and the second exhaust block is provided with a wave protrusion connected and matched with the wave groove. The wave groove and the wave protrusion are connected and matched to form a wave overflow channel connecting all third-level overflow grooves.

[0010] As a further improvement of the above technical solution, a sixth exhaust hole connected to the wave overflow channel is opened on the first exhaust block, and an exhaust pin is provided in the sixth exhaust hole to form an exhaust gap.

[0011] Beneficial effects of the utility model: Compared with the prior art, the utility model optimizes the aluminum liquid filling path by setting a multi-stage exhaust structure in the die-casting mold, and rationally layout the multi-stage overflow groove and exhaust holes. The aluminum liquid can smoothly flow into and fill the complex tooth structure, especially the bottom and deep part thereof, effectively solving the undercasting phenomenon caused by trapped air in the traditional mold, so that all parts of the piston product can be fully filled, significantly improving the density and integrity of the product. The multi-stage exhaust structure can timely and effectively discharge the gas inside the mold, avoiding the formation of internal pores during the cooling and solidification of the aluminum liquid, thereby significantly improving the mechanical properties and durability of the piston product and meeting the product quality of the piston product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of the multi-stage exhaust structure provided by the utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the piston product.

[0014] Figure 3 It is a schematic diagram of the structure of a piston casting with an overflow channel.

[0015] Explanation of main component symbols: 11-movable mold frame, 12-movable mold core, 2-cylindrical insert, 21-annular end face, 22-annular groove, 23-first stage overflow groove, 24-second stage overflow groove, 25-tail stage overflow groove, 3-annular deep groove, 4-third stage overflow groove, 51-first exhaust hole, 52-second exhaust hole, 53-third exhaust hole, 54-fourth exhaust hole, 55-fifth exhaust hole, 56-sixth exhaust hole, 6-first exhaust block, 61-wave groove, 7-exhaust pin, 8-piston product, 81-circular ring part, 82-tooth structure, 83-overflow channel. DETAILED DESCRIPTION

[0016] The utility model provides a multi-stage exhaust structure of 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.

[0017] See Figure 2 As shown, the piston product 8 includes a circular ring portion 81 and a tooth structure 82. The tooth structure has a special shape, specifically a vertical shape, a high depth, and is uneven and has a large fluctuation. Figure 3 As shown, the die-cast piston casting includes, in addition to the piston product 8 , an overflow channel 83 connected to the annular portion 81 .

[0018] See also Figure 1 The utility model provides a multi-stage exhaust structure of a die-casting mold, including a moving mold core 12, a cylindrical insert 2 arranged on the moving mold core 12, an annular end face 21, an annular groove 22, a first-stage overflow groove 23, and a second-stage overflow groove 24 are sequentially arranged on the cavity end of the cylindrical insert 2 from the outside to the inside, a large hole for the cylindrical insert 2 to be embedded is opened on the moving mold core 12, an annular deep groove 3 is formed between the inner side wall of the large hole and the outer side wall of the cylindrical insert 2, a third-stage overflow groove 4 located on the periphery of the annular deep groove 3 is opened on the moving mold core 12, and a third-stage overflow groove 4 is provided in the first-stage overflow groove 23. A vent hole 51 is provided, a second vent hole 52 is provided in the second-stage overflow groove 24, a third vent hole 53 is provided in the third-stage overflow groove 4, and a plurality of fourth vent holes 54 are opened on the annular end face 21. The first vent hole 51, the second vent hole 52, the third vent hole 53, and the fourth vent hole 54 are all provided with an exhaust pin 7 to form an exhaust gap. The aluminum liquid flowing into the die-casting mold cavity not only flows from the annular deep groove 3 to the annular end face 21, the annular groove 22, the first-stage overflow groove 23 and the second-stage overflow groove 24 in sequence, but also flows from the annular deep groove 3 to the third-stage overflow groove 4.

[0019] In fact, the movable mold core 12 and the cylindrical insert 2 in the die-casting mold cooperate with the fixed mold core to form a mold cavity. When the aluminum liquid enters the mold cavity, it first passes through the annular deep groove 3, and then fills along the annular end face 21, the annular groove 22, the first-level overflow groove 23, and the second-level overflow groove 24 layer by layer, forming an orderly and smooth aluminum liquid flow path, which effectively reduces the flow resistance of the aluminum liquid when filling the tooth position structure 82. It can be understood that the aluminum liquid has formed the annular portion 81 and the tooth position structure 82 of the piston product 8 at the annular deep groove 3, the annular end face 21 and the annular groove 22. The first-level overflow groove 23 and the second-level overflow groove 24 are used to collect excess metal liquid that exceeds the normal filling requirements or as a pressure release area. A small part of the aluminum liquid passes through the annular deep groove 3 and is diverted to the third-level overflow groove 4. The third-level overflow groove 4 further provides additional exhaust space and pressure release, which helps to reduce the gas pressure in the deep tooth area and reduce the possibility of gas hindering the filling of aluminum liquid. When the aluminum liquid is being filled, the gas generated inside the mold can be quickly discharged along these exhaust gaps. The fourth exhaust hole 54, the first exhaust hole 51, the second exhaust hole 52 and the third exhaust hole 53 form a multi-level exhaust layer to adapt to the changing pressure gradient when the aluminum liquid gradually penetrates into the tooth structure 82, ensuring that the gas can be discharged in time to avoid gas stagnation caused by gas stagnation.

[0020] Compared with the prior art, the utility model optimizes the aluminum liquid filling path by setting a multi-stage exhaust structure in the die-casting mold, and rationally layout the multi-stage overflow groove and exhaust holes. The aluminum liquid can smoothly flow into and fill the complex tooth structure 82, especially the bottom and deep part thereof, effectively solving the undercasting phenomenon caused by trapped air in the traditional mold, so that all parts of the piston product 8 can be fully filled, significantly improving the density and integrity of the product. The multi-stage exhaust structure can timely and effectively discharge the gas inside the mold, avoiding the formation of internal pores during the cooling and solidification of the aluminum liquid, thereby significantly improving the mechanical properties and durability of the piston product 8 and meeting the product quality of the piston product 8.

[0021] In this embodiment, the fourth exhaust holes 54 are arranged in a circular array on the annular end surface 21, which increases the exhaust area and improves the exhaust volume of the gas inside the mold per unit time, especially when the aluminum liquid quickly fills the tooth structure 82, it can more effectively deal with the large amount of gas generated instantly. For piston products 8 with large fluctuations and complex shapes in the tooth structure 82, the fourth exhaust holes 54 arranged in a circular array can better adapt to its shape changes, ensure effective exhaust at all angles and positions, reduce the flow resistance of the aluminum liquid, improve the filling quality, and enhance the adaptability of the mold to the complex structure piston product 8.

[0022] Specifically, the first-stage overflow grooves 23 are provided in plurality and are arranged at intervals around the annular groove 22, and a ring-shaped exhaust network is formed, so that the exhaust of each part of the mold is more balanced, avoiding uneven filling of aluminum liquid due to poor local exhaust. This uniform exhaust layout helps to reduce the pressure difference caused by uneven gas distribution inside the tooth structure 82, ensure the smooth flow of aluminum liquid in the entire tooth area, and further reduce the occurrence of undercasting.

[0023] The number of the second-stage overflow grooves 24 is the same as the number of the first-stage overflow grooves 23 and they are connected one-to-one. In other words, each first-stage overflow groove 23 and its corresponding second-stage overflow groove 24 form an independent exhaust unit, forming a deeper exhaust level. This one-to-one connection method makes the exhaust path of each exhaust unit shorter and the resistance smaller, which is conducive to the rapid discharge of gas inside the mold, especially when the aluminum liquid quickly fills the tooth structure 82, it can quickly respond to pressure changes, effectively prevent gas accumulation, and improve the overall exhaust efficiency.

[0024] Furthermore, a tail-stage overflow groove 25 is provided on the end of the cavity of the cylindrical insert 2, and all the second-stage overflow grooves 24 are connected to the tail-stage overflow groove 25, and a fifth exhaust hole 55 is provided in the tail-stage overflow groove 25, and an exhaust pin 7 is provided in the fifth exhaust hole 55 to form an exhaust gap. Through such a setting, the tail-stage overflow groove 25 serves as a common exhaust terminal for all the second-stage overflow grooves 24, thereby enhancing the coordination of the entire multi-stage exhaust system. The exhaust pressure of each layer of the overflow groove can be more smoothly transmitted to the tail-stage overflow groove 25, ensuring the synchronous exhaust work of each layer, avoiding the obstruction of the flow of aluminum liquid due to the uncoordinated exhaust, and improving the casting quality of the piston product 8. It can be understood that this centralized exhaust design is conducive to forming a larger exhaust flow rate and improving the exhaust efficiency, especially when the aluminum liquid quickly fills the tooth structure 82, it can more effectively cope with the large amount of gas generated instantly, avoid the gas blocking the flow of aluminum liquid, and reduce the generation of undercasting and internal pores.

[0025] Preferably, the third-level overflow grooves 4 are provided in plurality and arranged at intervals around the annular deep groove 3 to enhance the exhaust capacity around the annular deep groove 3. The plurality of third-level overflow grooves 4 arranged around form an annular exhaust network, so that the exhaust of each part of the mold is more balanced. This uniform exhaust layout helps to reduce the pressure difference caused by uneven gas distribution inside the tooth structure 82, ensures the smooth flow of aluminum liquid in the entire tooth area, and further reduces the problem of uneven filling caused by gas obstruction.

[0026] In this embodiment, there are four first-stage overflow troughs 23 and four second-stage overflow troughs 24, and the exhaust system composed of multiple independent first-stage overflow troughs 23 and second-stage overflow troughs 24 has a certain redundancy. Even if an individual exhaust unit is abnormal, the remaining units can still maintain an effective exhaust function, ensuring the stability and reliability of the overall casting process and reducing the probability of defective products due to single-point failures. There are five third-stage overflow troughs 4, which can meet the overflow and exhaust functions of the aluminum liquid to the greatest extent.

[0027] In order to prevent the exhaust gas gathered by the third-stage overflow trough 4 from being directly discharged to the side and causing high temperature injuries, and to improve the safety of the die-casting operation, a first exhaust block 6 is provided on the movable die frame 11 of the die-casting mold, and a second exhaust block matching the first exhaust block 6 is provided on the fixed die frame of the die-casting mold. The first exhaust block 6 is provided with a wave groove 61, and the second exhaust block is provided with a wave protrusion connected and matched with the wave groove 61. The wave groove 61 is connected and matched with the wave protrusion to form a wave overflow channel connecting all the third-stage overflow troughs 4. The continuous undulating design of the wave overflow channel can slow down the flow speed of the aluminum liquid until it stops, and collect excess aluminum liquid.

[0028] In this embodiment, the first exhaust block 6 and the second exhaust block are tightly combined with the die-casting mold, so the wave overflow channel is in a closed state, so the first exhaust block 6 is provided with a sixth exhaust hole 56 connected to the wave overflow channel, and the sixth exhaust hole 56 is provided with an exhaust pin 7 to form an exhaust gap. The first exhaust block 6 and the second exhaust block are discharged from the exhaust gap.

[0029] It should be noted that the exhaust outlets of the first exhaust hole 51, the second exhaust hole 52, the third exhaust hole 53, the fourth exhaust hole 54, the fifth exhaust hole 55, and the sixth exhaust hole 56 are all facing the square iron of the die-casting mold, so the discharged high-temperature gas will not hurt people. The die-casting machine will have a spray mechanism to spray release agent, coolant, and cleaning agent, which will cool the mold and clean the residual aluminum slag. After cleaning, it will be blown clean by air. During normal production, the exhaust gap will not be blocked.

[0030] 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.

[0031] 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.

[0032] 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. A multi-stage exhaust structure of a die-casting mold, characterized in that: The invention comprises a movable mold core and a cylindrical insert arranged on the movable mold core, wherein an annular end face, an annular groove, a first-level overflow groove and a second-level overflow groove are sequentially arranged on the cavity end of the cylindrical insert from the outside to the inside, a large hole for embedding the cylindrical insert is provided on the movable mold core, an annular deep groove is formed between the inner side wall of the large hole and the outer side wall of the cylindrical insert, a third-level overflow groove located at the periphery of the annular deep groove is provided on the movable mold core, a first exhaust hole is provided in the first-level overflow groove, a second exhaust hole is provided in the second-level overflow groove, a third exhaust hole is provided in the third-level overflow groove, a plurality of fourth exhaust holes are provided on the annular end face, exhaust pins are provided in the first exhaust hole, the second exhaust hole, the third exhaust hole and the fourth exhaust hole to form an exhaust gap, and the aluminum liquid flowing into the cavity of the die-casting mold not only flows from the annular deep groove to the annular end face, the annular groove, the first-level overflow groove and the second-level overflow groove in sequence, but also flows from the annular deep groove to the third-level overflow groove.

2. The multi-stage exhaust structure of the die-casting mold according to claim 1, characterized in that: There are multiple first-stage overflow grooves arranged at intervals around the annular groove, and the number of second-stage overflow grooves is the same as the number of first-stage overflow grooves and they are connected one-to-one.

3. The multi-stage exhaust structure of the die-casting mold according to claim 2, characterized in that: A tail-stage overflow groove is also provided on the end of the cavity of the cylindrical insert, and the second-stage overflow groove is connected to the tail-stage overflow groove. A fifth exhaust hole is provided in the tail-stage overflow groove, and an exhaust pin is provided in the fifth exhaust hole to form an exhaust gap.

4. The multi-stage exhaust structure of the die-casting mold according to claim 1, characterized in that: The third-stage overflow grooves are provided in plurality and are arranged at intervals around the annular deep groove.

5. The multi-stage exhaust structure of the die-casting mold according to claim 4, characterized in that: A first exhaust block is provided on the movable die frame of the die-casting mold, and a second exhaust block matching the first exhaust block is provided on the fixed die frame of the die-casting mold. The first exhaust block is provided with a wave groove, and the second exhaust block is provided with a wave protrusion connected and matched with the wave groove. The wave groove and the wave protrusion are connected and matched to form a wave overflow channel connecting all third-level overflow grooves.

6. The multi-stage exhaust structure of the die-casting mold according to claim 5, characterized in that: The first exhaust block is provided with a sixth exhaust hole connected with the wave overflow channel, and an exhaust pin is provided in the sixth exhaust hole to form an exhaust gap.

7. The multi-stage exhaust structure of the die-casting mold according to claim 5, characterized in that: The fourth exhaust holes are arranged in a circular array on the annular end surface.

Images