A choke type extrusion die having a back hole in an inclined position

Abstract

The utility model discloses a resistance flow type extrusion die with back hole in inclined position, including upper die and lower die, the upper die is provided with the first shunt hole from the feeding side to the discharge side through, the side wall of first shunt hole is the first inclined plane inclined and towards the feeding side, be provided with a plurality of first sunken bridge in first shunt hole, the feeding side surface of first sunken bridge is below the first inclined plane, and first sunken bridge divides and forms a plurality of first two shunt holes to the discharge side of first shunt hole, and the inclined plane back hole is provided with from the feeding side to the discharge side through in the middle part of first inclined plane. The scheme adopts the mode for setting shunt hole on the inclined plane of upper die feeding side, and there is resistance in feeding, therefore this position can carry out feeding again, has the required slower feeding speed, can better match with the feeding of other parts of section bar section, satisfies the special feeding requirement of difficult forming part, helps to solve the problem that the section bar of special shape is difficult to extrude and form, improves production efficiency and the yield.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion die technology, and specifically relates to a flow-blocking extrusion die with a back hole on the inclined side. Background Technology

[0002] In some existing profile extrusion dies, the upper die typically has multiple diversion holes to allow the extruded bar material to flow in separately. The design of these diversion holes is directly related to the forming effect at different locations on the profile. In conventional structures, the diversion holes are located on the feed side of the upper die, allowing the raw material to flow directly into them, resulting in a relatively fast feeding speed. For profiles with large size spans and relatively complex structures, it is necessary to balance the feeding speed at different locations on the cross-section to avoid unsatisfactory forming or forming failures such as profile bending. Therefore, more types of diversion holes are needed to ensure control over the feeding speed. Currently, there is no optimal solution for situations where it is necessary to ensure a stable feed speed while controlling the feeding speed. For example, for... Figure 4 The conventional solution for the profile shown is to set multiple flow holes around the profile cross-section contour. However, there are partitions formed between the cavity structures in the cross-section shape of this profile, which makes it difficult to ensure material supply and may result in incomplete forming. If a flow hole is added directly to the corresponding location, it will cause the material supply in that part to be too fast. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flow-blocking extrusion die with a back hole on the inclined position, which solves the problem in the prior art that it is difficult to control the slow feeding speed while ensuring the feeding, and achieves beneficial effects such as improving the yield of extrusion molding of complex cross-section profiles.

[0004] According to the technical solution of this utility model, this utility model provides a flow-blocking extrusion die with a back hole on an inclined position, including an upper die and a lower die. The upper die is provided with a first diversion hole that runs from the inlet side to the outlet side. One side wall of the first diversion hole is inclined and faces the inlet side. A plurality of first bridges are provided in the first diversion hole. The inlet side of the first bridge is below the first inclined side. The first bridges divide the outlet side of the first diversion hole into a plurality of first and second diversion holes. A sloped back hole that runs from the inlet side to the outlet side is provided in the middle of the first inclined side.

[0005] In some implementations, the first and second diversion holes are distributed around the beveled back hole.

[0006] In some embodiments, the upper mold is further provided with a second diversion hole that runs through from the inlet side to the outlet side. The first diversion hole and the second diversion hole are located on both sides of the center of the upper mold, respectively. One side wall of the second diversion hole is an inclined second slope facing the inlet side. Several second sinkers are provided in the second diversion hole. The inlet side of the second sinker is below the second slope. The second sinker divides the outlet side of the second diversion hole into several second and second diversion holes. The first slope and the second slope are both located on the side close to the center of the upper mold. On the outer side away from the center of the upper mold, the side walls of the first diversion hole and the second diversion hole are inclined and gradually expand outward from the inlet side to the outlet side.

[0007] In some embodiments, the upper mold is also provided with a central flow-dividing hole that runs from the inlet side to the outlet side. The central flow-dividing hole is located between the first flow-dividing hole and the second flow-dividing hole, and the central flow-dividing hole and the first flow-dividing hole and the second flow-dividing hole form a primary flow-dividing bridge.

[0008] In some embodiments, a first mold core is provided on the upper mold discharge side, and a first secondary flow divider hole, a middle flow divider hole, and a second secondary flow divider hole are distributed around the first mold core.

[0009] In some embodiments, there are at least two central flow holes, with at least one central flow hole provided on each side of the first mold core.

[0010] In some embodiments, the cross-sectional shape of the produced profile includes a first cavity and a second cavity located on one side of the first cavity; the lower die is provided with a die hole that extends from the inlet side to the outlet side, and the outline of the die hole is consistent with the outer outline of the cross-sectional shape of the produced profile; the upper die is also provided with a second die core on the outlet side; the first die core corresponds to the first cavity, and the second die core corresponds to the second cavity; the inclined back hole is located between the first die core and the second die core.

[0011] In some embodiments, the cross-sectional shape of the produced profile also includes a third cavity, with the first cavity, the second cavity, and the third cavity arranged side by side in sequence; a third mold core is also provided on the upper mold discharge side, with the first mold core corresponding to the third cavity.

[0012] In some embodiments, the first cavity is rectangular, the second cavity is located at one end along the length of the first cavity, the size of the second cavity is smaller than that of the first cavity, and the size of the third cavity is smaller than that of the second cavity.

[0013] In some embodiments, the cross-sectional shape of the produced profile includes a first cavity and a second cavity located on one side of the first cavity; the lower die is provided with a die hole that runs from the inlet side to the outlet side, and the outline of the die hole is consistent with the outer outline of the cross-sectional shape of the produced profile; a second die core is also provided on the outlet side of the upper die; the first die core corresponds to the first cavity, and the second die core corresponds to the second cavity; a beveled back hole is located between the first die core and the second die core; the cross-sectional shape of the produced profile also includes a third cavity, and the first cavity, the second cavity, and the third cavity are arranged side by side in sequence; a third die core is also provided on the outlet side of the upper die, and the first die core corresponds to the third cavity; the first cavity is rectangular, the second cavity is located at one end of the length direction of the first cavity, the size of the second cavity is smaller than that of the first cavity, and the size of the third cavity is smaller than that of the second cavity; a first secondary diversion hole, a middle diversion hole, and a second secondary diversion hole are distributed around the first die core and the second die core, and the second die core and the third die core are located between the two first and second secondary diversion holes.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows: In this invention, a flow-blocking extrusion die with a back hole on an inclined surface employs a method of creating a flow-diverting hole on the inclined surface of the upper die's feed side. More specifically, a smaller back hole is further created on the inclined side of the larger flow-diverting hole. If conventional die design methods are used to directly add a flow-diverting hole to the upper die, the feeding speed will be too fast, resulting in an unbalanced overall feeding speed and making it difficult to achieve the desired forming effect. In this solution, because the back hole is located on an inclined surface, it provides resistance to the feed. Therefore, this position allows for both feeding and the required slower feeding speed, thus better matching the feeding of other parts of the profile cross-section and meeting the special feeding requirements of difficult-to-form parts. This invention provides a new approach to the design of flow-diverting holes in extrusion dies, helping to solve the problem of difficult extrusion forming of some special-shaped profiles, improving production efficiency and yield. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the extrusion die provided by this utility model.

[0016] Figure 2 yes Figure 1 A schematic diagram of the upper mold feeding side in the embodiment shown.

[0017] Figure 3 This is a cross-sectional structural diagram of the extrusion die provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the cross-sectional shape of a typical profile to which this utility model applies.

[0019] Explanation of reference numerals in the attached figures: 11. Upper mold; 11. First diversion hole; 111. First inclined surface; 112. First and second diversion holes; 113. First sinker bridge; 114. Sloping back hole; 12. Second diversion hole; 121. Second inclined surface; 122. Second and second diversion holes; 123. Second sinker bridge; 13. Middle diversion hole; 14. First mold core; 15. Second mold core; 16. Third mold core; 17. First diversion bridge; 2. Lower mold; 21. Mold hole; 31. First cavity; 32. Second cavity; 33. Third cavity. Detailed Implementation

[0020] This invention provides a flow-blocking extrusion die with a back hole on the inclined side, which solves the problem in the prior art that it is difficult to control the slow feeding speed while ensuring the feeding of materials, and achieves beneficial effects such as improving the yield of extrusion molding of complex cross-section profiles.

[0021] Please see Figures 1 to 3 This utility model discloses a flow-blocking extrusion die with a back hole on an inclined surface. It is a flow-dividing combination die, comprising an upper die 1 and a lower die 2. The upper die 1 is provided with a first flow-dividing hole 11 extending from the inlet side to the outlet side. The first flow-dividing hole 11 is an inclined hole with a certain angle relative to the die axis. One side wall of the first flow-dividing hole 11 is an inclined surface 111 facing the inlet side. Figure 2 As shown, when viewed from the side of the upper mold 1 where it is fed, the first inclined surface 111 in the first diversion hole 11 can be seen (in the illustrated embodiment, the first inclined surface 111 can be seen completely). Several first sinkers 113 are provided within the first diversion hole 11. The feeding side of the first sinkers 113 is below the first inclined surface 111 (and naturally below the feeding side of the upper mold 1). For example, the first sinkers 113 connect outward from the first inclined surface 111 to the remaining sidewalls of the first diversion hole 11. The first sinkers 113 divide the discharge side of the first diversion hole 11 into several first and second-level diversion holes 112. A sloping back hole 114, extending from the feeding side to the discharge side, is provided in the middle of the first inclined surface 111. The feeding side of the sloping back hole 114 is surrounded by sloping surfaces (the first inclined surface 111). The extruded raw material first enters the first diversion hole 11 (primary diversion hole). Under the action of the first inclined surface 111, the raw material is pushed and guided, and then diverted by the first sinker 113 into the first and second secondary diversion holes 112. Most of the raw material in the first diversion hole 11 enters the first and second secondary diversion holes 112, and a relatively small portion of the raw material enters the inclined back hole 114 to supplement the local structure. Since the inclined back hole 114 is located on the inclined surface, there is resistance to the feeding, so it can be ensured that the feeding at this point will not be too fast.

[0022] More specifically, the first and second-level diversion holes 112 are distributed around the inclined back hole 114; for example, there are three first bridges 113 in the first diversion hole 11, forming four first and second-level diversion holes 112, which are distributed in a fan shape around the inclined back hole 114.

[0023] Furthermore, in the illustrated embodiment, the upper mold 1 is also provided with a second diversion hole 12 that extends from the inlet side to the outlet side. The first diversion hole 11 and the second diversion hole 12 are located on both sides of the center of the upper mold 1 to accommodate larger profile spans. Similar to the first diversion hole, one side wall of the second diversion hole 12 is an inclined second slope 121 facing the inlet side. Several second bridges 123 are provided inside the second diversion hole 12. The inlet side of the second bridges 123 is below the second slope 121. The second bridges 123 divide the outlet side of the second diversion hole 12 into several second and secondary diversion holes 122. More specifically, there are three second bridges 123 in the second diversion hole 12, forming four second and secondary diversion holes 122, which are distributed in a fan shape around the second slope 121.

[0024] The first inclined surface 111 and the second inclined surface 121 are both located on the side (inner side) close to the center of the upper mold 1 and on the outer side away from the center of the upper mold 1. The side walls of the first diversion hole 11 and the second diversion hole 12 are inclined from the material inlet side to the material outlet side, so that the material inlet can achieve the effect of pushing and guiding the flow outward through the inclined hole and the inclined surface, so that the raw material covers the required span of the profile.

[0025] The upper die 1 is also provided with a central flow-dividing hole 13 that runs from the inlet side to the outlet side. The central flow-dividing hole 13 is located between the first flow-dividing hole 11 and the second flow-dividing hole 12. A primary flow-dividing bridge 17 is formed between the central flow-dividing hole 13 and the first flow-dividing hole 11 and the second flow-dividing hole 12. The primary flow-dividing bridge 17 is directly formed on the upper die 1, and the inlet side of the primary flow-dividing bridge 17 is the inlet side of the upper die 1. The extruded material first contacts the inlet side of the upper die 1, and then flows through the primary flow-dividing bridge 17 into the central flow-dividing hole 13, the first flow-dividing hole 11 and the second flow-dividing hole 12, and then undergoes corresponding secondary flow-dividing in the first flow-dividing hole 11 and the second flow-dividing hole 12.

[0026] The upper mold 1 has a first mold core 14 on the discharge side, and a first secondary flow divider hole 112, a middle flow divider hole 13, and a second secondary flow divider hole 122 are distributed around the first mold core 14. There are at least two middle flow divider holes 13 (two in the illustrated embodiment), and at least one middle flow divider hole 13 is provided on both sides of the first mold core 14.

[0027] The lower die 2 has a through-hole 21 extending from the inlet side to the outlet side, and the outline of the through-hole 21 matches the outer contour of the cross-sectional shape of the produced profile. Before extrusion, the upper and lower dies are assembled, and the die core is inserted into the die hole. The gap between the die core and the die hole is the same as the cross-sectional shape of the profile. The specific structure of the lower die 2 and the basic principle of the extrusion die can be designed according to existing technology as needed, and are not the focus of this utility model improvement, so they will not be elaborated here.

[0028] Please also refer to Figure 4 The produced profile has a cross-sectional shape including a first cavity 31 and a second cavity 32 located on one side of the first cavity 31. A partition is formed between the first cavity 31 and the second cavity 32. Due to its position, this partition is difficult to form using conventional methods, resulting in a high overall scrap rate. Correspondingly, a second mold core 15 is also provided on the discharge side of the upper mold 1. The first mold core 14 corresponds to the first cavity 31, and the second mold core 15 corresponds to the second cavity 32. The inclined back hole 114 is located between the first mold core 14 and the second mold core 15.

[0029] Furthermore, the cross-sectional shape of the produced profile also includes a third cavity 33. The first cavity 31, the second cavity 32, and the third cavity 33 are arranged side by side in sequence, forming a large span dimension. Correspondingly, a third mold core 16 is also provided on the material discharge side of the upper mold 1, and the first mold core 14 corresponds to the third cavity 33. The first cavity 31 is, for example, generally rectangular. The second cavity 32 is located at one end of the length direction of the first cavity 31, and the third cavity 33 is further located behind that end of the second cavity 32. The size of the second cavity 32 is smaller than that of the first cavity 31, and the size of the third cavity 33 is smaller than that of the second cavity 32.

[0030] like Figure 1 , Figure 4In the specific embodiment shown, the cross-sectional shape of the produced profile includes a first cavity 31 and a second cavity 32 located on one side of the first cavity 31; the lower mold 2 is provided with a die hole 21 that extends from the inlet side to the outlet side, and the outline of the die hole 21 is consistent with the outer outline of the cross-sectional shape of the produced profile; the upper mold 1 is also provided with a second die core 15 on the outlet side; the first die core 14 corresponds to the first cavity 31, and the second die core 15 corresponds to the second cavity 32; the inclined back hole 114 is located between the first die core 14 and the second die core 15, and the inclined back hole 114 is, for example, a straight hole or The oblique hole and the discharge side of the oblique back hole 114 form the gap between the first mold core 14 and the second mold core 15. The cross-sectional shape of the produced profile also includes a third cavity 33. The first cavity 31, the second cavity 32, and the third cavity 33 are arranged side by side in sequence. The discharge side of the upper mold 1 is also provided with a third mold core 16, with the first mold core 14 corresponding to the third cavity 33. The first cavity 31 is rectangular, and the second cavity 32 is located at one end of the length direction of the first cavity 31. The size of the second cavity 32 is smaller than that of the first cavity 31, and the size of the third cavity 33 is smaller than that of the second cavity 32. Based on this, the first and second secondary diversion holes 112, the middle diversion hole 13, and the second and second secondary diversion holes 122 are distributed around the first mold core 14 and the second mold core 15. The second mold core 15 and the third mold core 16 are located between the two first and second secondary diversion holes 112. In this typical embodiment, the profile cross-section is generally flat and has a large span, requiring the material to be pushed outwards from the middle. One end also has a small cavity structure. Based on its symmetrical structure, it is positioned between the two first and second-level diversion holes 112 to ensure material supply. The partition between the small cavity and the large cavity of the main body is located between the two molds and is relatively large. Material feeding is difficult in the middle of the partition, which can be solved by using the inclined back hole 114 of this solution. This invention is particularly suitable for profiles with a large span and a partition structure between two cavities on the outer side.

[0031] In summary, the flow-blocking extrusion die with a back hole on the inclined side of the present invention adopts the method of opening a diversion hole on the inclined surface of the upper die's feed side, more specifically, further opening a smaller back hole on the inclined side of the larger diversion hole; if the conventional die design method is used to directly add a diversion hole to the upper die, the feeding speed will be too fast, resulting in an unbalanced overall feeding speed, and it will still be difficult to obtain the ideal forming effect; in this solution, since the back hole is opened on the inclined surface, there is resistance to the feeding, so this position can both allow feeding and have the required slower feeding speed, thus better matching the feeding of other parts of the profile cross section and meeting the special feeding requirements of difficult-to-form parts; the present invention provides a new idea for the design of diversion holes in extrusion dies, which helps to solve the problem of difficult extrusion forming of some special-shaped profiles, and improves production efficiency and yield.

Claims

1. A flow-blocking extrusion die with a back hole on an inclined surface, comprising an upper die (1) and a lower die (2), characterized in that, The upper mold (1) is provided with a first diversion hole (11) that runs from the inlet side to the outlet side. One side wall of the first diversion hole (11) is an inclined first slope (111) facing the inlet side. Several first sinkers (113) are provided in the first diversion hole (11). The inlet side of the first sinker (113) is below the first slope (111). The first sinker (113) divides the outlet side of the first diversion hole (11) into several first and second diversion holes (112). A slope back hole (114) that runs from the inlet side to the outlet side is provided in the middle of the first slope (111).

2. The flow-blocking extrusion die with a back hole on the inclined side according to claim 1, characterized in that, The first and second level diversion holes (112) are distributed around the inclined back hole (114).

3. The flow-blocking extrusion die with a back hole on the inclined side according to claim 2, characterized in that, The upper mold (1) is also provided with a second diversion hole (12) that runs from the inlet side to the outlet side. The first diversion hole (11) and the second diversion hole (12) are located on both sides of the center of the upper mold (1); The second diversion hole (12) has one side wall that is inclined and faces the feed side (121). Several second sinkers (123) are provided in the second diversion hole (12). The feed side of the second sinker (123) is below the second inclined surface (121). The second sinker (123) divides the discharge side of the second diversion hole (12) into several second and second secondary diversion holes (122). The first inclined surface (111) and the second inclined surface (121) are both located on the side close to the center of the upper mold (1), on the outside away from the center of the upper mold (1). The side walls of the first diversion hole (11) and the second diversion hole (12) are both inclined from the inlet side to the outlet side.

4. The flow-blocking extrusion die with a back hole on the inclined side according to claim 3, characterized in that, The upper mold (1) is also provided with a middle flow hole (13) that runs from the inlet side to the outlet side. The middle flow hole (13) is located between the first flow hole (11) and the second flow hole (12). The middle flow hole (13) is connected to the first flow hole (11) and the second flow hole (12) as a first-level flow bridge (17).

5. The flow-restricting extrusion die with a back hole on the inclined side according to claim 4, characterized in that, The upper mold (1) has a first mold core (14) on the discharge side, and a first secondary flow divider hole (112), a middle flow divider hole (13) and a second secondary flow divider hole (122) are distributed around the first mold core (14).

6. The flow-restricting extrusion die with a back hole on the inclined side according to claim 5, characterized in that, There are at least two central flow holes (13), and at least one central flow hole (13) is provided on both sides of the first mold core (14).

7. The flow-restricting extrusion die with a back hole on the inclined side according to any one of claims 1-6, characterized in that, The cross-sectional shape of the produced profile includes a first cavity (31) and a second cavity (32) located on one side of the first cavity (31); The lower mold (2) is provided with a mold hole (21) that runs from the inlet side to the outlet side. The outline of the mold hole (21) is consistent with the outer outline of the cross-sectional shape of the profile produced. The upper mold (1) is also provided with a second mold core (15) on the discharge side; the first mold core (14) corresponds to the first cavity (31), and the second mold core (15) corresponds to the second cavity (32); the inclined back hole (114) is located between the first mold core (14) and the second mold core (15).

8. The flow-restricting extrusion die with a back hole on the inclined side according to claim 7, characterized in that, The cross-sectional shape of the produced profile also includes a third cavity (33), and the first cavity (31), the second cavity (32), and the third cavity (33) are arranged side by side in sequence; The upper mold (1) is also provided with a third mold core (16) on the discharge side, and the first mold core (14) corresponds to the third cavity (33).

9. The flow-restricting extrusion die with a back hole on the inclined side according to claim 8, characterized in that, The first cavity (31) is rectangular, the second cavity (32) is located at one end of the length direction of the first cavity (31), the size of the second cavity (32) is smaller than that of the first cavity (31), and the size of the third cavity (33) is smaller than that of the second cavity (32).

10. The flow-blocking extrusion die with a back hole on the inclined side according to claim 6, characterized in that, The cross-sectional shape of the produced profile includes a first cavity (31) and a second cavity (32) located on one side of the first cavity (31); the lower mold (2) is provided with a die hole (21) that runs from the inlet side to the outlet side, and the outline of the die hole (21) is consistent with the outer outline of the cross-sectional shape of the produced profile; the upper mold (1) is also provided with a second die core (15) on the outlet side; the first die core (14) corresponds to the first cavity (31), and the second die core (15) corresponds to the second cavity (32); the inclined back hole (114) is located between the first die core (14) and the second die core (114). Between 15); the cross-sectional shape of the produced profile also includes a third cavity (33), the first cavity (31), the second cavity (32) and the third cavity (33) are arranged side by side in sequence; the upper mold (1) is also provided with a third mold core (16) on the discharge side, the first mold core (14) corresponds to the third cavity (33); the first cavity (31) is rectangular, the second cavity (32) is located at one end of the length direction of the first cavity (31), the size of the second cavity (32) is smaller than that of the first cavity (31), and the size of the third cavity (33) is smaller than that of the second cavity (32); The first secondary diversion hole (112), the middle diversion hole (13) and the second secondary diversion hole (122) are distributed around the first mold core (14) and the second mold core (15), and the second mold core (15) and the third mold core (16) are located between the two first secondary diversion holes (112).

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