Pagoda type branch flow control extrusion die

Abstract

The pagoda type branch flow control extrusion die comprises an upper die body and a lower die body which are installed in a matched mode, a boss is arranged in the middle of the feeding side of the upper die body, and a middle feeding hole penetrating in the feeding direction is formed in the range of the boss; on the feeding side of the upper die, peripheral arc-shaped feeding holes are formed in the periphery of the boss, and the feeding side face of the boss is flush with or higher than the feeding side faces of the peripheral arc-shaped feeding holes; a plurality of peripheral flow dividing bridges are arranged in the peripheral arc-shaped feeding hole, the feeding side face of each peripheral flow dividing bridge is lower than that of the peripheral arc-shaped feeding hole, the discharging side of the peripheral arc-shaped feeding hole is divided into a plurality of peripheral flow dividing holes through the peripheral flow dividing bridges, and the peripheral flow dividing holes are through in the feeding direction. The effect that feeding is slow in the middle and fast in the periphery can be achieved, the flow and the flow speed of all parts can be controlled more carefully and accurately, therefore, the feeding effect is good, the profile forming degree is good, and high-quality production of profiles with hollow middles and complex peripheral shapes can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of extrusion dies, and in particular relates to a pagoda-type flow-controlled extrusion die. Background Art

[0002] Taking aluminum profiles as an example, the basic principle of the profile extrusion process is to apply a certain pressure to the raw aluminum rod so that it flows out from the mold hole or the gap between the mold hole and the mold core, thereby obtaining a profile with the desired cross-sectional shape and size. In this process, it is necessary to ensure that the speed of the cross-sectional shape of the profile is consistent at all locations during discharge. Specifically, the flow distribution in the extrusion die is controlled by designing the internal structure of the extrusion die so that the flow conditions at all locations match the cross-sectional shape. Otherwise, it is impossible to produce a profile with an ideal straight cross-sectional shape. For example, Figure 5 The profile with the cross-sectional shape shown has a large cross-sectional size, and the overall center position is empty. The surrounding side walls also have cavities, screw holes, cantilevers and other structures. Therefore, there needs to be relatively sufficient feed on the periphery. A certain amount of feed is also needed on the inside, so that the aluminum materials on both sides of the inside and outside can be welded at the die hole. At the same time, because the aluminum rod is extruded and diverted to the middle of the extrusion die, the flow rate and flow rate in the middle are generally faster than those on the periphery. This makes it difficult to form this type of profile. The mold designed using existing conventional design methods will have defects such as unsatisfactory local structural forming. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pagoda-shaped flow-controlled extrusion die to solve the problem that the existing extrusion die is difficult to normally produce profiles with a hollow middle part and complex outer shapes, and to achieve better control of the diversion and flow rate of the feed through a new structural design, thereby forming the required feeding effect of slow in the middle and fast on the periphery.

[0004] According to the technical solution of the present invention, the present invention provides a pagoda-type flow control extrusion die, including an upper die and a lower die installed in conjunction with each other, a boss is provided at the middle position of the feed side of the upper die, and a central feed hole is provided within the range of the boss and passes through along the feed direction; on the feed side of the upper die, a peripheral arc-shaped feed hole is provided on the periphery of the boss, and the feed side surface of the boss is flush with or higher than the feed side surface of the peripheral arc-shaped feed hole; a plurality of peripheral diversion bridges are provided in the peripheral arc-shaped feed hole, and the feed side surface of the peripheral diversion bridge is lower than the feed side surface of the peripheral arc-shaped feed hole, and the peripheral diversion bridge divides the discharge side of the peripheral arc-shaped feed hole into multiple peripheral diversion holes, and the peripheral diversion holes pass through along the feed direction.

[0005] In some embodiments, the cross-sectional shape of the profile produced is a U-shaped structure. The U-shaped structure includes two side walls and a bottom wall, and there is at least one cavity on at least one side wall. The opening of the U-shaped structure is opposite to the bottom wall; on the discharge side of the upper die, there is a protruding die core, and the die core corresponds to the cavity.

[0006] In some embodiments, the size of the peripheral diversion holes corresponding to the opening position is smaller than the size of the peripheral diversion holes corresponding to the bottom wall position.

[0007] In some embodiments, the position of the middle feed hole corresponds to the inside of the U-shaped structure of the cross-sectional shape of the profile; there are two peripheral arc-shaped feed holes, and the positions of the two peripheral arc-shaped feed holes correspond to the two side walls on both sides; on the side corresponding to the opening, there is a first interval between the two peripheral arc-shaped feed holes; on the side corresponding to the bottom wall, there is a second interval between the two peripheral arc-shaped feed holes.

[0008] In some embodiments, on the discharge side of the upper die, there is a protruding blocking block, and the range of the blocking block extends from the first interval position to the middle position of the upper die.

[0009] In some embodiments, on the feed side of the upper die, the edge contour lines of the two peripheral arc-shaped feed holes and the edge contour line of the boss are concentric circles.

[0010] In some embodiments, there is a chamfer that gradually expands outward from the feed to the discharge direction between the boss and the feed side of the peripheral diversion bridge, or there is a chamfer that gradually expands outward from the feed to the discharge direction between the boss and the feed side of the peripheral arc-shaped feed hole.

[0011] In some embodiments, there are multiple middle feed holes, and the multiple middle feed holes are separated by a middle diversion bridge.

[0012] In some embodiments, the peripheral arc-shaped feed holes are inclined holes that gradually expand outward from the feed to the discharge direction, and / or the peripheral diversion holes are inclined holes that gradually expand outward from the feed to the discharge direction.

[0013] In some embodiments, a welding chamber is provided in the lower die, and a through die hole is provided in the welding chamber.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The pagoda - type split - control flow extrusion die of the present invention is provided with a through - hole in the middle as the middle feeding hole, and the feeding side of the middle feeding hole protrudes and is relatively higher than the surrounding surfaces. This kind of boss structure can be intuitively called pagoda - shaped. An outer arc - shaped feeding hole is also arranged around the boss. Therefore, when the raw material bar is extruded and fed, the resistance of the outer part is smaller than that of the middle part, and the effect of slow feeding in the middle and fast feeding at the periphery can be achieved. Further, an outer split - flow bridge forms an outer split - flow hole. Based on the structural shape design of the split - flow bridge and the split - flow hole, the flow rate and velocity of each part can be controlled more precisely and accurately. Therefore, the feeding effect is better, the profile forming degree is better, and the high - quality production of profiles with a hollow middle and a complex outer shape can be achieved. Brief Description of the Drawings

[0015] Figure 1 It is a perspective structural schematic diagram of the extrusion die provided by the present invention in the combined state of the upper and lower dies.

[0016] Figure 2 It is a sectional structural schematic diagram of the extrusion die provided by the present invention in the combined state of the upper and lower dies.

[0017] Figure 3 It is a structural schematic diagram of the feeding side of the upper die provided by the present invention.

[0018] Figure 4 It is a structural schematic diagram of the discharging side of the upper die provided by the present invention.

[0019] Figure 5 It is a sectional shape schematic diagram of the profile produced by the extrusion die provided by the present invention.

[0020] Explanation of the reference numerals in the drawings: 1. Upper die; 2. Lower die; 3. Boss; 4. Middle feeding hole; 5. Outer arc - shaped feeding hole; 6. Outer split - flow bridge; 7. Outer split - flow hole; 8. Die core; 9. Blocking block; 10. Middle split - flow bridge; 11. Welding chamber; 12. Die hole. Detailed Description of the Invention

[0021] The present invention provides a pagoda - type split - control flow extrusion die, which solves the problem that the existing extrusion die is difficult to produce profiles with a hollow middle and a complex outer shape normally, and realizes better control of the split - flow and flow rate of feeding through a new structural design, forming the required feeding effect of slow in the middle and fast at the periphery.

[0022] Please refer to Figures 1 to 4, a pagoda - type split - control flow extrusion die of the present invention is a split - flow combined die, including an upper die 1 and a lower die 2 which are installed in cooperation. The structures of the upper die 1 and the lower die 2 match each other so as to jointly form the required internal cavity structure of the die and the discharge - side structure consistent with the cross - section shape of the profile. At the middle position of the feeding side of the upper die 1, a boss 3 is provided, and a central feeding hole 4 penetrating along the feeding direction is provided within the range of the boss 3. On the feeding side of the upper die 1, an outer - peripheral arc - shaped feeding hole 5 is provided around the boss 3, so that all the central feeding holes 4 are surrounded by the outer - peripheral arc - shaped feeding hole 5. The feeding side surface of the boss 3 is flush with or higher than the feeding side surface of the outer - peripheral arc - shaped feeding hole 5. A plurality of outer - peripheral split bridges 6 are provided in the outer - peripheral arc - shaped feeding hole 5. The feeding side surface of the outer - peripheral split bridge 6 is lower than the feeding side surface of the outer - peripheral arc - shaped feeding hole 5. The outer - peripheral split bridge 6 divides the discharge side of the outer - peripheral arc - shaped feeding hole 5 into a plurality of outer - peripheral split holes 7, and the outer - peripheral split holes 7 penetrate along the feeding direction. Among them, the height and low of the feeding side surface are relative to the direction from feeding to discharging. The higher part or the so - called protruding part will contact the feeding first; the lower part or the so - called sunken part will contact the feeding later.

[0023] There is usually a certain corresponding relationship between the diameter size of the raw material bar (such as an aluminum bar), the size of the extrusion die, and the model of the extruder. Specifically, reference can be made to Figure 3 , when the raw material bar is fed for extrusion, it will first contact concentrically with the feeding side surface of the upper die 1. The outer - edge size of the raw material bar is larger than the outer - edge size of the boss 3. The middle part of the raw material bar corresponds to the boss 3 in the middle of the upper die 1, and the outer periphery of the raw material bar corresponds to the outer - peripheral arc - shaped feeding hole 5. In some embodiments, the outer - edge size of the raw material bar is less than or equal to the outer - edge size of the outer - peripheral arc - shaped feeding hole 5. Due to the existence of the boss 3, a greater resistance will be exerted on the middle part of the raw material bar, and the feeding will be pushed from the middle to the outer periphery. And the outer periphery is in the form of a through - hole on the feeding side, and there is no split bridge on its feeding side (the outer - peripheral split bridge 6 sinks inside the outer - peripheral arc - shaped feeding hole 5). Therefore, the feeding situation of the outer periphery will be significantly improved, ensuring the forming of the complex structure on the outer periphery of the profile.

[0024] In some embodiments, as Figure 2 shown ( Figure 2 is a schematic imaginary cross - sectional view to show all the main structural features), the feeding side surface of the boss 3 is flush with the feeding side surface of the outer - peripheral arc - shaped feeding hole 5. The periphery of the boss 3 is the outer - peripheral split bridge 6 in the outer - peripheral arc - shaped feeding hole 5. The feeding side surface of the boss 3 is higher than the feeding side surface of the outer - peripheral split bridge 6, so as to achieve the above - mentioned technical effects. In other embodiments, the feeding side surface of the boss 3 is higher than the feeding side surface of the outer - peripheral arc - shaped feeding hole 5, making the split effect from the middle to the outer periphery stronger. Optionally, there is a gap, a slope or a step formed between the root of the boss 3 and the outer - peripheral arc - shaped feeding hole 5.

[0025] More specifically, typically, please refer to Figure 5 ( Figure 5 The profile shown is specifically a corner column), the cross-sectional shape of the profile produced by the extrusion die of the present invention is in a U-shaped structure, the U-shaped structure includes two side walls and a bottom wall, and there is at least one cavity on one side wall (in the illustrated profile structure, there are cavities on both side walls and the bottom wall), and the opening of the U-shaped structure faces the bottom wall. On the discharge side of the upper die 1, there is a protruding die core 8, the die core 8 corresponds to the cavity, and the outer side surface of the die core 8 is a working belt, thereby forming a specific shape of the inner side surface of the profile cavity.

[0026] It can be understood that the present invention is not limited to the illustrated embodiments. For example, the profile is not in a U-shaped structure, but there is also a top wall connected at the opening position in the figure to form a tubular structure, or the overall die hole is in a shape other than a square, etc. As long as it is a situation where the outer feeding is much larger than the middle feeding, the solution of the present invention can be adopted.

[0027] Further, please refer to Figure 4 , for the U-shaped profile, the size of the peripheral diversion holes 7 (the two diversion holes located in the middle position above in the figure) corresponding to the opening position is smaller than the size of the peripheral diversion holes 7 (the two diversion holes located in the middle position below in the figure) corresponding to the bottom wall position. Thus, more feeding is provided for the part corresponding to the bottom wall (below), and the opening (above) is empty, so less feeding is required. This solution is particularly suitable for complex profiles with cavities on the bottom wall and structures such as cantilevers on the outside of the bottom wall.

[0028] More specifically, the position of the middle feeding hole 4 corresponds to the inside of the U-shaped structure of the profile cross-sectional shape. There are two peripheral arc-shaped feeding holes 5, and the positions of the two peripheral arc-shaped feeding holes 5 correspond to the two side walls on both sides. The two peripheral arc-shaped feeding holes 5 are symmetric or substantially symmetric. On the side corresponding to the opening, there is a first interval between the two peripheral arc-shaped feeding holes 5; on the side corresponding to the bottom wall, there is a second interval between the two peripheral arc-shaped feeding holes 5. The first interval and the second interval form a diversion bridge structure. Please refer to Figure 3 , the first interval and the second interval can connect the feeding side surfaces of the upper die 1 together and have sufficient ability to resist the extrusion effect. It can be imagined that in some other embodiments, the peripheral arc-shaped feeding holes 5 can also be selected as one segment, three segments, four segments or more segments of arcs.

[0029] Further, please refer to Figure 4 , Figure 4 Equivalent to Figure 3The upper die 1 shown is turned over, and its discharging side is observed. There is a protruding blocking block 9 on the discharging side of the upper die 1. The range of the blocking block 9 extends from the first spaced position to the middle position of the upper die 1. The blocking block 9 is close to the feeding side of the lower die 2. The structure of the blocking block 9 is wider than that of a conventional shunt bridge bottom. The blocking block 9 is used to block the feeding. Please refer to Figure 1 , the blocking block 9 is adapted to the U-shaped structure. The feeding in the middle enters through the middle feeding hole 4. Due to the blocking of the blocking block 9, it will tend to flow outward, so that the flow path is clearer and smoother, which is beneficial to controlling the flow rate in the inner regions of both side walls and forming a good welding effect. At the same time, since the lower die 2 needs to be provided with a die hole of a U-shaped structure, a cantilever structure suspended on three sides will be formed in the middle. The arrangement of the blocking block 9 can also prevent a large amount of feeding from directly squeezing the middle of the cantilever structure and avoid its collapse and deformation.

[0030] Preferably, the boss 3 is generally circular (such as cylindrical or frustum-shaped). On the feeding side of the upper die 1, the edge contour lines of the two peripheral arc-shaped feeding holes 5 are concentric with the edge contour line of the boss 3, which better matches the cylindrical raw material rod.

[0031] Preferably, there is a chamfer that gradually expands outward from the feeding to the discharging direction between the boss 3 and the feeding side of the peripheral shunt bridge 6 (for the case where the root of the boss 3 is directly connected to the feeding side of the peripheral shunt bridge 6, please refer to Figure 2 ), or there is a chamfer that gradually expands outward from the feeding to the discharging direction between the boss 3 and the feeding side of the peripheral arc-shaped feeding hole 5 (for the case where the boss 3 is higher than the peripheral shunt bridge 6 and there is a gap between them on the feeding side, please refer to Figure 3 ). The chamfer is, for example, an inclined surface or a curved surface, and its outward-expanding structure is more conducive to making the feeding flow outward.

[0032] Preferably, there are multiple middle feeding holes 4. For example, in the illustrated embodiment, there are four middle feeding holes 4 distributed in a cross shape. The multiple middle feeding holes 4 are separated by a middle shunt bridge 10. The arrangement of multiple middle feeding holes 4 can respectively adjust the sizes of the middle feeding holes 4, so as to more precisely control the flow rate at the corresponding positions. Furthermore, as Figure 1 shown in the embodiment, each feeding hole and shunt hole on the discharging side are arranged in a circle around the U-shaped structure of the die hole.

[0033] Preferably, please refer to Figure 1 , Figure 2 , the peripheral arc-shaped feeding hole 5 is an inclined hole that gradually expands outward from the feeding to the discharging direction, and / or the peripheral shunt hole 7 is an inclined hole that gradually expands outward from the feeding to the discharging direction. The use of the inclined hole structure is more conducive to expanding the feeding beyond the diameter size of the raw material rod, and is more suitable for the forming of profiles with complex peripheral structures and larger cross-sectional dimensions.

[0034] As a more specific supplementary description, after the extrusion die set is assembled, the lower die 2 is installed on the discharging side of the upper die 1. The lower die 2 is provided with a welding chamber 11. A through die hole 12 is arranged in the welding chamber 11. The die hole 12 is consistent with the outer contour of the profile cross-sectional shape. The die core 8 is located in the die hole 12. Preferably, a four-stage relief groove is provided on the discharging side of the lower die 2 to avoid surface extrusion marks and extrusion lines generated by the friction between the profile and the die during the discharging of the profile.

[0035] In summary, the tower-type separate control flow extrusion die of the present invention is provided with a through hole in the middle as the middle feeding hole, and the feeding side surface of the middle feeding hole protrudes and is relatively higher than the surrounding surfaces. This convex platform structure type can be intuitively called tower-shaped. An outer arc feeding hole is also arranged around the convex platform. Therefore, when the raw material rod is extruded and fed, the resistance of the outer periphery is smaller than that of the middle part, and the effect of slow feeding in the middle and fast feeding at the outer periphery can be achieved. Further, an outer peripheral diversion hole is formed through the outer peripheral diversion bridge. Based on the structural shape design of the diversion bridge and the diversion hole, the flow rate and flow velocity of each part can be controlled more precisely and accurately. Therefore, the feeding effect is better, the profile forming degree is better, and the high-quality production of a profile with a hollow middle part and a complex outer shape can be achieved.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention; for the convenience of description, only parts related to the relevant invention are shown in the drawings. Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other; modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some of the technical features, does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pagoda-style split-control flow extrusion die, comprising an upper die (1) and a lower die (2) which are cooperatively installed, characterized in that, A boss (3) is provided at the middle position on the feeding side of the upper die (1), and a middle feeding hole (4) penetrating along the feeding direction is provided within the range of the boss (3); on the feeding side of the upper die (1), an outer arc-shaped feeding hole (5) is provided on the periphery of the boss (3), and the feeding side surface of the boss (3) is flush with or higher than the feeding side surface of the outer arc-shaped feeding hole (5); a plurality of outer dividing bridges (6) are provided in the outer arc-shaped feeding hole (5), the feeding side surface of the outer dividing bridge (6) is lower than the feeding side surface of the outer arc-shaped feeding hole (5), and the outer dividing bridge (6) divides the discharging side of the outer arc-shaped feeding hole (5) into a plurality of outer dividing holes (7), and the outer dividing holes (7) penetrate along the feeding direction.

2. The pagoda-type split-control flow extrusion die according to claim 1, wherein The cross-sectional shape of the profile produced is a U-shaped structure, the U-shaped structure includes two side walls and a bottom wall, and there is at least one cavity on one of the side walls, and the opening of the U-shaped structure faces the bottom wall; on the discharging side of the upper die (1), there is a protruding die core (8), and the die core (8) corresponds to the cavity.

3. The pagoda-type split-control flow extrusion die according to claim 2, wherein, The size of the outer dividing hole (7) corresponding to the opening position is smaller than the size of the outer dividing hole (7) corresponding to the bottom wall position.

4. The pagoda-type split control flow extrusion die according to claim 2, characterized in that, The position of the middle feeding hole (4) corresponds to the inside of the U-shaped structure of the cross-sectional shape of the profile; there are two outer arc-shaped feeding holes (5), and the positions of the two outer arc-shaped feeding holes (5) correspond to the two side walls on both sides; on the side corresponding to the opening, there is a first interval between the two outer arc-shaped feeding holes (5); on the side corresponding to the bottom wall, there is a second interval between the two outer arc-shaped feeding holes (5).

5. The pagoda-type split-control flow extrusion die according to claim 4, characterized in that, On the discharging side of the upper die (1), there is a protruding blocking block (9), and the range of the blocking block (9) extends from the first interval position to the middle position of the upper die (1).

6. The pagoda-style split-flow extrusion die according to claim 2, wherein On the feeding side of the upper die (1), the edge contour lines of the two outer arc-shaped feeding holes (5) and the edge contour line of the boss (3) are concentric circles.

7. The pagoda-type split-control flow extrusion die according to any one of claims 1-6, characterized in that, There is a chamfer that gradually expands outward from the feeding to the discharging direction between the feeding side surface of the boss (3) and the outer dividing bridge (6), or there is a chamfer that gradually expands outward from the feeding to the discharging direction between the feeding side surface of the boss (3) and the outer arc-shaped feeding hole (5).

8. The pagoda-type split control flow extrusion die according to any one of claims 1-6, characterized in that, There are a plurality of middle feeding holes (4), and the plurality of middle feeding holes (4) are separated by a middle dividing bridge (10).

9. The pagoda-type split-control flow extrusion die according to any one of claims 1-6, characterized in that, The outer arc-shaped feeding hole (5) is an inclined hole that gradually expands outward from the feeding to the discharging direction, and / or the outer dividing hole (7) is an inclined hole that gradually expands outward from the feeding to the discharging direction.

10. The pagoda-type split-control flow extrusion die according to any one of claims 1-6, characterized in that, The lower die (2) is provided with a welding chamber (11), and a through die hole (12) is provided in the welding chamber (11).

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