Metal profile shunting extrusion die with cooling structure

Abstract

The invention discloses a metal profile split-flow extrusion die with a cooling structure, comprising: a die body with an extrusion forming channel; the die cushion is arranged at the rear end of the die body, a discharging channel communicated with the extrusion forming channel and a plurality of exhaust grooves are formed in the die cushion, the exhaust grooves are distributed around the discharging channel at intervals, the air outlet end of each exhaust groove is communicated with the discharging channel, and a bottom plate made of thermal expansion materials is arranged at the bottom of each exhaust groove. The expansion amount of the bottom plate is in direct proportion to the temperature, the sectional area of the exhaust groove where the bottom plate is located can be changed through expansion of the bottom plate, an air inlet used for introducing liquid nitrogen is formed in the side wall of the die cushion, and a fluid channel used for communicating the air inlet with the air inlet end of each exhaust groove is formed in the die cushion. Through the innovative cooling structure design, rapid cooling and uniform temperature control of the mold are achieved, the service life of the mold is prolonged, and the quality of an extrusion forming part is improved.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, in particular to a metal profile splitting extrusion mould with a cooling structure. Background Art

[0002] Metal profile split extrusion molding is an industrial manufacturing process widely used in aluminum alloys, copper alloys and other materials. During the extrusion process, the molten metal flows through the mold forming channel and cools and solidifies. The cooling process directly affects the quality of the molded parts and the service life of the mold. However, most of the existing mold cooling technologies use traditional water cooling or oil cooling methods, which have slow cooling speeds and are prone to uneven cooling, further affecting the quality and dimensional accuracy of the extruded products.

[0003] Liquid nitrogen cooling technology has gradually become an important means to solve the defects of traditional cooling methods due to its advantages of rapid cooling and precise temperature control. However, the application of existing liquid nitrogen cooling systems in molds still faces technical challenges. For example, there will be temperature differences between different areas of the mold and the molded parts that flow through the mold forming channel and cool and solidify. At present, the cross-sectional area of ​​the liquid nitrogen flow channel in each area of ​​the mold is equal, which makes the flow rate of the liquid nitrogen flow channel in each area of ​​the mold equal. In this way, the flow rate of the liquid nitrogen flow channel cannot be adjusted according to the temperature of different areas of the mold and the molded part, so that the overall temperature of the mold and the molded part cannot be consistent, which reduces the service life of the mold and the quality of the molded part.

[0004] Therefore, designing a metal profile split extrusion die with a more precise cooling structure has become an urgent need for technological development in this field. Summary of the invention

[0005] The present application provides a metal profile diversion extrusion die with a cooling structure, which realizes rapid cooling and uniform temperature control of the die through innovative cooling structure design, thereby improving the service life of the die and the quality of the extruded parts.

[0006] The metal profile split extrusion die with a cooling structure provided in the present application comprises: A die body having an extrusion molding channel; The die pad is arranged at the rear end of the die body, and is provided with a discharge channel connected to the extrusion molding channel and a plurality of exhaust grooves. The plurality of exhaust grooves are spaced around the discharge channel, and the outlet end of each exhaust groove is connected to the discharge channel. A bottom plate made of thermal expansion material is provided at the bottom of each exhaust groove. The expansion amount of the bottom plate is proportional to the temperature. The bottom plate can change the cross-sectional area of ​​the exhaust groove by expansion. An air inlet for introducing liquid nitrogen is provided on the side wall of the die pad, and a fluid channel for connecting the air inlet with the air inlet end of each exhaust groove is provided on the die pad.

[0007] Preferably, the thermal expansion of the base plate is between 5% and 10%.

[0008] Preferably, the base plate is made of expanded aluminum, expanded ceramics, expanded glass, expanded graphite or aluminum-magnesium alloy.

[0009] Preferably, the fluid channel includes a first annular channel, a second annular channel and a plurality of connecting channels, the air inlet end of each exhaust groove is connected to the second annular channel, the first annular channel is arranged around the second annular channel, the first annular channel and the second annular channel are connected through a plurality of connecting channels, and the air inlet is connected to the first annular channel.

[0010] Preferably, there are two air inlets, the two air inlets are symmetrically arranged about the axis of the die pad, and the two air inlets are both connected to the first annular channel.

[0011] Preferably, the depths of the first annular channel, the connecting channel, the second annular channel and the exhaust groove decrease in sequence, the depths of the multiple connecting channels are the same, and the depths of the multiple exhaust grooves are the same.

[0012] Preferably, the mold pad is provided with a plurality of connecting parts, the base plate and the connecting parts are alternately connected to form an integral annular component, each connecting part is detachably embedded in the first end face of the mold pad, each connecting part is flush with the first end face of the mold pad, each base plate is detachably arranged in the corresponding exhaust groove, and the first end face of the mold pad is used to tightly abut against the rear end face of the mold body so as to press and fix the connecting part on the mold pad through the rear end face of the mold body.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages: The present invention improves the cooling efficiency of the mold by arranging a liquid nitrogen cooling structure and an expandable bottom plate in the mold pad, while effectively avoiding the phenomenon of uneven cooling. Through the rapid cooling characteristics of liquid nitrogen and the temperature response expansion function of the bottom plate, the cross-sectional area of ​​the exhaust groove can be dynamically adjusted, thereby optimizing the temperature distribution inside the mold. In addition, the present invention has a simple structure, a reasonable design, and is easy to produce and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the mold pad.

[0015] Explanation of the accompanying drawings: 10, mold body; 20, mold pad; 21, discharge channel; 22, exhaust groove; 23, bottom plate; 24, air inlet; 25, first annular channel; 26, connecting channel; 27, second annular channel; 28, connecting piece. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 , Figure 2 As shown, the metal profile diversion extrusion die with a cooling structure in this embodiment includes a die body 10 and a die pad 20.

[0018] The die body 10 has an extrusion molding channel, and the extrusion molding channel is used for the flow and molding of the metal melt.

[0019] The die pad 20 is arranged at the rear end of the die body 10. A discharge channel 21 connected to the extrusion molding channel and a plurality of exhaust grooves 22 are provided on the die pad 20. The plurality of exhaust grooves 22 are spaced around the discharge channel 21. The exhaust end of each exhaust groove 22 is connected to the discharge channel 21. After the molten metal passes through the extrusion molding channel of the die body 10, an extruded part is obtained, and then the extruded part is discharged after passing through the discharge channel 21. The exhaust groove 22 can spray liquid nitrogen onto the surface of the extruded part in the discharge channel 21 to cool the extruded part, which can quickly cool down the high-temperature particles on the surface of the extruded part. The high-temperature particles after rapid cooling will become brittle, so that it is easy to brush and remove the cooled high-temperature particles on the surface of the extruded part, so that the surface of the extruded part is smoother.

[0020] The bottom of each exhaust groove 22 is provided with a bottom plate 23 made of a thermal expansion material. The expansion amount of the bottom plate 23 is proportional to the temperature. The bottom plate 23 can change the cross-sectional area of ​​the exhaust groove 22 by expanding. The side wall of the mold pad 20 is provided with an air inlet 24 for introducing liquid nitrogen. The mold pad 20 is provided with a fluid channel for connecting the air inlet 24 with the air inlet end of each exhaust groove 22. In this way, after the liquid nitrogen is introduced into the air inlet 24, it flows in the fluid channel, thereby cooling the mold pad 20, and then the liquid nitrogen is sprayed to the discharge channel through the exhaust groove 22. The bottom plate 23 in each exhaust groove 22 can expand by a certain proportion according to the different temperatures in the area where the exhaust groove 22 is located, so as to change the cross-sectional area of ​​each exhaust groove 22. For example, the smaller the cross-sectional area of ​​an exhaust groove 22, the faster the flow rate of liquid nitrogen in the exhaust groove 22 is, and the faster the temperature drop rate of the area where the exhaust groove 22 is located is, and the faster the flow rate of liquid nitrogen sprayed from the exhaust groove 22 to the extruded part is, so that the temperature drop rate of the extruded part area to which the exhaust groove 22 is aimed is faster.

[0021] The bottom plate 23 is made of expanded aluminum, expanded ceramics, expanded glass, expanded graphite or aluminum-magnesium alloy. The thermal expansion of the bottom plate 23 is between 5% and 10%. Generally, when the temperature exceeds 400 degrees, the bottom plate 23 will begin to expand. As the temperature increases, the expansion of the bottom plate 23 increases accordingly.

[0022] The fluid channel includes a first annular channel 25, a second annular channel 27 and a plurality of connecting channels 26. The air inlet end of each exhaust groove 22 is connected to the second annular channel 27. The first annular channel 25 is arranged around the second annular channel 27. The first annular channel 25 and the second annular channel 27 are connected through a plurality of connecting channels 26. The air inlet 24 is connected to the first annular channel 25. In this way, the liquid nitrogen introduced into the air inlet 24 first enters the first annular channel 25, and then enters the second annular channel 27 through the connecting channel 26. Then, the liquid nitrogen is sprayed toward the extruded part of the discharge channel 21 through the exhaust groove 22.

[0023] There are two air inlets 24 , which are symmetrically arranged about the axis of the mold pad 20 , and both air inlets 24 are connected to the first annular channel 25 . In this way, liquid nitrogen can be introduced into the two air inlets 24 at the same time, which can make the liquid nitrogen evenly distributed and improve the cooling effect on the mold pad 20 .

[0024] The depths of the first annular channel 25, the connecting channel 26, the second annular channel 27 and the exhaust groove 22 decrease successively, the depths of the multiple connecting channels 26 are the same, and the depths of the multiple exhaust grooves 22 are the same, thereby further optimizing the fluid flow path, reducing fluid resistance, and increasing the fluid flow speed along the first annular channel 25, the connecting channel 26, the second annular channel 27 and the exhaust groove 22 successively, so as to improve the cooling effect on the die pad 20.

[0025] The mold pad 20 is provided with a plurality of connecting members 28, and the bottom plate 23 and the connecting members 28 are alternately connected to form an integral annular component, which is a replaceable module component. Each connecting member 28 is detachably embedded in the first end face of the mold pad 20, and each connecting member 28 is flush with the first end face of the mold pad 20. Each bottom plate 23 is detachably arranged in the corresponding exhaust groove 22. The first end face of the mold pad 20 is used to tightly abut against the rear end face of the mold body 10, so that the connecting member 28 can be pressed and fixed on the mold pad 20 through the rear end face of the mold body 10. In this way, after the bottom plate 23 has been used for a long time, its thermal expansion performance will be reduced. In this way, the mold pad 20 can be separated from the mold body 10, the annular component can be removed from the mold pad 20 as a whole, and then a new annular component can be placed on the mold pad 20, so that the replacement of all bottom plates 23 and connecting members 28 can be completed, which is more convenient.

[0026] The first annular channel 25, the second annular channel 27, the multiple connecting channels 26 and the multiple exhaust grooves 22 are all grooves opened on the first end face of the mold pad 20. The two air inlets 24 are opened on the peripheral wall of the mold pad 20 and extend along the radial direction of the mold pad 20 until the two air inlets 24 are connected to the first annular channel 25.

[0027] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. A metal profile split extrusion die with a cooling structure, characterized in that: include: A mold body (10) having an extrusion molding channel; A die pad (20) is arranged at the rear end of the die body (10). The die pad (20) is provided with a discharge channel (21) connected to the extrusion molding channel and a plurality of exhaust grooves (22). The plurality of exhaust grooves (22) are spaced around the discharge channel (21). The exhaust end of each exhaust groove (22) is connected to the discharge channel (21). The bottom of each exhaust groove (22) is provided with a bottom plate (23) made of a thermal expansion material. The expansion amount of the bottom plate (23) is proportional to the temperature. The bottom plate (23) can change the cross-sectional area of ​​the exhaust groove (22) by expansion. An air inlet (24) for introducing liquid nitrogen is provided on the side wall of the die pad (20). The die pad (20) is provided with a fluid channel for connecting the air inlet (24) with the air inlet end of each exhaust groove (22).

2. The metal profile split extrusion die according to claim 1, characterized in that: The thermal expansion amount of the bottom plate (23) is between 5% and 10%.

3. The metal profile split extrusion die according to claim 1, characterized in that: The bottom plate (23) is made of expanded aluminum, expanded ceramics, expanded glass, expanded graphite or aluminum-magnesium alloy.

4. The metal profile split extrusion die according to claim 1, characterized in that: The fluid channel comprises a first annular channel (25), a second annular channel (27) and a plurality of connecting channels (26); the air inlet end of each exhaust groove (22) is connected to the second annular channel (27); the first annular channel (25) is arranged around the second annular channel (27); the first annular channel (25) and the second annular channel (27) are connected via the plurality of connecting channels (26); and the air inlet (24) is connected to the first annular channel (25).

5. The metal profile split extrusion die according to claim 4, characterized in that: There are two air inlets (24), the two air inlets (24) are symmetrically arranged about the axis of the die pad (20), and the two air inlets (24) are both connected to the first annular channel (25).

6. The metal profile split extrusion die according to claim 4, characterized in that: The depths of the first annular channel (25), the connecting channel (26), the second annular channel (27) and the exhaust groove (22) decrease in sequence; the depths of the plurality of connecting channels (26) are the same, and the depths of the plurality of exhaust grooves (22) are the same.

7. The metal profile split extrusion die according to claim 4, characterized in that: The die pad (20) is provided with a plurality of connecting members (28), the bottom plate (23) and the connecting members (28) are alternately connected to form an integral annular component, each connecting member (28) is detachably embedded in the first end face of the die pad (20), each connecting member (28) is flush with the first end face of the die pad (20), each bottom plate (23) is detachably arranged in a corresponding exhaust groove (22), and the first end face of the die pad (20) is used to tightly abut against the rear end face of the die body (10) so as to press and fix the connecting member (28) on the die pad (20) through the rear end face of the die body (10).

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