Extrusion die with inward force preventing outward expansion

Abstract

This utility model discloses an inward-contracting force anti-outward-expansion extrusion mold, including an upper mold and a lower mold. The upper mold has a protruding first mold core and a second mold core on the discharge side, which are adjacent to each other and have a forming gap between them. The upper mold has a through-hole, which includes inward-contracting flow-dividing holes located on both sides of the first and second mold cores. The inner and outer sides of the inward-contracting flow-dividing holes are inclined towards the first and second mold cores in the direction from material inlet to outlet. The flow-dividing hole also includes a central flow-dividing hole, which corresponds to the forming gap between the first and second mold cores. This utility model sets a central flow-dividing hole in the middle of the two small mold cores to ensure material supply, and sets inward-contracting flow-dividing holes on the outer side of the two small mold cores. During extrusion, the material in the inward-contracting flow-dividing holes pushes the mold core from the outside to the inside, which plays a role in contracting the mold core inward. This counteracts the pressure of the central flow-dividing hole pushing the mold core outward, thereby ensuring the stability of the small mold core.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion die technology, specifically relating to an extrusion die with inward force to prevent outward expansion. Background Technology

[0002] During the extrusion molding process, the raw material is diverted by the flow divider bridge of the extrusion die and flows towards the discharge side within the flow divider orifice. Existing flow dividers are generally straight orifices (the orifice wall is parallel to the discharge direction) or outwardly inclined orifices (the orifice wall slopes outward to expand the central feed area). When the die core is small and lacks sufficient strength, it is prone to swaying under pressure during the extrusion process. Consequently, in the case of two adjacent die cores in the produced profile, the distance between the two cores will change, resulting in an unsatisfactory wall thickness at that point. Specifically, for example, two small die cores may bulge outward, leading to a larger wall thickness between them. Furthermore, due to the unstable deformation of the small die cores, there is a significant difference in wall thickness. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an inward force anti-outward extrusion mold, which solves the problem that the existing mold core is prone to swaying and deformation, resulting in unsatisfactory wall thickness. It realizes the inward force on the mold core through the design of the diversion hole, prevents the mold core from expanding outward, and ensures the distance between the two mold cores.

[0004] According to the technical solution of this utility model, this utility model provides an inward force anti-outward extrusion mold, including an upper mold and a lower mold. The upper mold has a protruding first mold core and a second mold core on the discharge side. The first mold core and the second mold core are arranged adjacent to each other and have a forming gap between them. The upper mold has a through-hole, which includes inwardly converging diversion holes located on both sides of the first mold core and the second mold core. The inner and outer sides of the inwardly converging diversion holes are inclined towards the first mold core and the second mold core in the direction from material inlet to material outlet. The diversion hole also includes a central diversion hole, which corresponds to the forming gap between the first mold core and the second mold core.

[0005] In some implementations, the size of the central flow orifice gradually decreases along the direction from feed to discharge.

[0006] In some embodiments, the central flow-diverting orifice is a rounded rectangle on the feed side, the length direction of the rounded rectangle is perpendicular to the length direction of the forming gap, and the forming gap is located in the middle of the length direction of the rounded rectangle. The central flow-diverting orifice shrinks from both sides to the middle in the length direction along the feed to discharge direction.

[0007] In some embodiments, the diversion orifice also includes an outer diversion orifice, and the outer diversion orifice and the inner diversion orifice together constitute a plurality of diversion orifices surrounding a ring distributed around the middle diversion orifice.

[0008] In some embodiments, the inner side of the outer diversion hole is inclined toward the first mold core and the second mold core in the direction from feed to discharge.

[0009] In some embodiments, reinforcing blocks are provided on both sides of the first mold core and the second mold core away from the molding gap.

[0010] In some embodiments, the cross-sectional shape of the profile produced includes a first cavity and a second cavity corresponding to the first mold core and the second mold core, respectively, and a thick-walled portion located below the first cavity and the second cavity; the upper mold is also provided with a protruding guide cone on the discharge side, the discharge side of the guide cone is a gradually narrowing cone, and the guide cone corresponds to the thick-walled portion.

[0011] In some embodiments, the lower die is provided with a recessed welding chamber, and a die hole extending from the inlet side to the outlet side is provided in the welding chamber. The outline of the die hole is consistent with the outer outline of the cross-sectional shape of the produced profile. The outlet end of the guide cone is located on the inlet side of the bottom plane of the welding chamber, and there is an outlet gap between the outlet end of the guide cone and the bottom plane of the welding chamber. The size of the guide cone is smaller than the part of the die hole corresponding to the thick-walled portion.

[0012] In some embodiments, the lower die is also provided with a protruding flow-blocking band on the material inlet side, and the flow-blocking band is arranged around the part of the die hole corresponding to the thick-walled part.

[0013] In some embodiments, a mold pad is also provided on the discharge side of the lower mold, and the mold pad has a mold pad discharge hole that communicates with the discharge side of the mold hole.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model's inward-contracting anti-outward-expansion extrusion die is designed for situations with two adjacent small die cores. A central flow-diverting hole is provided between the two small die cores to ensure material supply. An inward-contracting flow-diverting hole is provided on the outer side of the two small die cores. This inward-contracting flow-diverting hole is an inclined hole with an inward slope. During extrusion, the flow force of the material within the inward-contracting flow-diverting hole pushes the die core from the outside inward, effectively constricting it inward. This counteracts the pressure exerted by the central flow-diverting hole on the die core's outward push, thus solving the problem of insufficient strength and easy deformation of the small die core, ensuring the stability of the small die core, and thereby improving the yield rate of this type of profile. Attached Figure Description

[0015] Figure 1 This is a perspective structural diagram of the upper and lower molds combined according to the present invention.

[0016] Figure 2 This is a cross-sectional view of the upper mold, lower mold, and mold pad assembly provided by this utility model.

[0017] Figure 3This is a schematic diagram of the flow divider hole structure on the side of the upper mold feeding section provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the flow distribution hole and mold core on the material discharge side of the upper mold provided by this utility model.

[0019] Figure 5 This is a schematic diagram of the cross-sectional shape of a typical profile provided by this utility model.

[0020] Explanation of reference numerals in the attached figures: 1. Upper mold; 11. First mold core; 12. Second mold core; 13. Inner diversion hole; 14. Middle diversion hole; 15. Outer diversion hole; 16. Reinforcing block; 17. Guide cone block; 2. Lower mold; 21. Welding chamber; 22. Mold hole; 23. Flow barrier; 31. First cavity; 32. Second cavity; 33. Thick wall section; 4. Mold pad; 41. Mold pad discharge hole. Detailed Implementation

[0021] This utility model provides an inward-contracting force anti-outward-expansion extrusion mold, which solves the problem of the existing mold core being prone to swaying and deformation, resulting in unsatisfactory wall thickness. It achieves the inward-contracting force on the mold core through the design of the diversion hole, preventing the mold core from expanding outward and ensuring the distance between the two mold cores.

[0022] Please see Figures 1 to 5 This utility model discloses an inward-contracting anti-outward-expansion extrusion mold, comprising an upper mold 1 and a lower mold 2, which is a flow-dividing combination mold. The upper mold 1 has a protruding first mold core 11 and a second mold core 12 on the discharge side. The first mold core 11 and the second mold core 12 are arranged adjacent to each other and have a forming gap between them, which extends through the material from the inlet side to the outlet side. The upper mold 1 has a flow-dividing hole extending through the material from the inlet side to the outlet side. The flow-dividing hole includes inward-contracting flow-dividing holes 13 located on both sides of the first mold core 11 and the second mold core 12. The inward-contracting flow-dividing holes 13 are oblique holes, and the inner and outer sides of the inward-contracting flow-dividing holes 13 are inclined towards the first mold core 11 and the second mold core 12 in the direction from the inlet to the outlet, thereby causing the raw material to gradually flow inward and compress the first mold core 11 and the second mold core 12 in this manner. The flow divider also includes a central flow divider 14, which corresponds to the molding gap between the first mold core 11 and the second mold core 12. The central flow divider 14 directly supplies material to the molding gap to ensure sufficient material supply to this part. It also works with the inward flow divider 13 to make the forces on both sides of the first mold core 11 and the second mold core 12 basically balanced, preventing the mold core from swaying outward and ensuring the stability of the mold core.

[0023] Furthermore, the size of the central flow-diverting orifice 14 gradually decreases along the direction from feed to discharge. More specifically, for example, the central flow-diverting orifice 14 is a rounded rectangle on the feed side, the length direction of the rounded rectangle is perpendicular to the length direction of the forming gap, and the forming gap is located in the middle of the length direction of the rounded rectangle. The central flow-diverting orifice 14 decreases in size from both sides towards the middle along the length direction from feed to discharge. The gradual decrease in size of the central flow-diverting orifice 14 can prevent the feed flow rate in the middle from being too fast, facilitate the consistency of the overall feed, and provide sufficient space for setting the first mold core 11 and the second mold core 12 structure, ensuring the structural strength of the mold core.

[0024] Preferably, reinforcing blocks 16 are provided on both sides of the first mold core 11 and the second mold core 12 away from the molding gap. The reinforcing blocks 16 increase the thickness of the middle part of the first mold core 11 and the second mold core 12, thereby further improving the mold core's resistance to pressure and making the mold core less prone to deformation.

[0025] Furthermore, the flow divider also includes an outer flow divider 15, which, together with the inner flow divider 13, constitutes a plurality of flow dividers surrounding the central flow divider 14. The inner side of the outer flow divider 15 is inclined toward the first mold core 11 and the second mold core 12 in the direction from material inlet to material outlet, so that the material inlet on the outside can flow toward the center.

[0026] Please see Figure 5 The profiles produced by this manufacturer have a cross-sectional shape including a first cavity 31 and a second cavity 32 corresponding to the first mold core 11 and the second mold core 12, respectively, and a thick-walled portion 33 located below the first cavity 31 and the second cavity 32. The thick-walled portion 33 refers to a solid portion with a wall thickness greater than normal, and this portion is prone to hollowness.

[0027] The upper mold 1 is also provided with a protruding guide cone 17 on the discharge side. The discharge side of the guide cone 17 is a tapered cone (the cross section is trapezoidal or triangular). The guide cone 17 corresponds to the thick wall part 33. The guide cone 17 forms a protrusion on the discharge side of the upper mold 1, reducing the space between the upper mold 1 and the lower mold 2, and achieving flow guidance based on the tapered slope, thereby ensuring that there is enough raw material for forming the thick wall part 33.

[0028] More specifically, the lower mold 2 is provided with a recessed welding chamber 21, and a die hole 22 extending from the inlet side to the outlet side is provided in the welding chamber 21. The outline of the die hole 22 is consistent with the outer outline of the cross-sectional shape of the produced profile. The structure of the lower mold 2 corresponds to the upper mold and the cross-sectional shape of the profile. Its specific structure can be referred to in the prior art and is not the focus of the improvement of this utility model, so it will not be described in detail.

[0029] Furthermore, the discharge end of the guide cone 17 is located on the inlet side of the bottom plane of the welding chamber 21, and there is a discharge gap between the discharge end of the guide cone 17 (e.g., a flat surface) and the bottom plane of the welding chamber 21. The size of the guide cone 17 is smaller than the portion of the die hole 22 corresponding to the thick-walled portion 33. This allows the extruded raw material to enter the portion of the die hole 22 corresponding to the thick-walled portion 33 through the area around the guide cone 17 and the discharge gap, achieving the desired effect of guiding and increasing flow rate. It should be noted that... Figure 2 This is for illustrative purposes only. An imaginary cross-section was chosen to show more structural features; for actual positional relationships, please refer to [reference needed]. Figure 1 The interior of the part directly below the guide cone 17 that corresponds to the mold hole 22 and the thick-walled part 33.

[0030] Preferably, the lower die 2 is further provided with a protruding flow-blocking band 23 on the material inlet side, and the flow-blocking band 23 is arranged around the portion of the die hole 22 corresponding to the thick-walled portion 33. For more details, please refer to... Figure 2 The flow-blocking strip 23 has a transition slope on the side away from the die hole 22. The flow-blocking strip 23, in conjunction with the flow-guiding cone 17, can further ensure the material feeding effect of the thick-walled section 33, avoid hollowness, and facilitate the adjustment of the material feeding flow rate of each part of the profile.

[0031] Preferably, a die pad 4 is also provided on the discharge side of the lower die 2. The die pad 4 has a die pad discharge hole 41 that communicates with the discharge side of the die hole 22. The die pad 4 serves to increase the rigidity of the die and reduce the elastic deformation of the die (upper die and lower die) during the extrusion process. The die pad discharge hole 41 ensures that the profile will not come into contact with the die pad 4 when it is discharged.

[0032] In summary, the inward-contracting anti-outward-expansion extrusion die of this utility model, designed for cases with two adjacent small die cores, features a central flow-dividing hole in the middle of the two small die cores to ensure material supply. An inward-contracting flow-dividing hole is located on the outer side of the two small die cores. This inward-contracting flow-dividing hole is an inclined hole with an inward slope. During extrusion, the flow force of the material within the inward-contracting flow-dividing hole pushes the die core from the outside inward, effectively constricting it inward. This counteracts the pressure exerted by the central flow-dividing hole on the die core's outward push, thus solving the problem of insufficient strength and easy deformation of the small die core, ensuring the stability of the small die core, and thereby improving the yield rate of this type of profile.

Claims

1. A mold for preventing outward extrusion by inward force, comprising an upper mold (1) and a lower mold (2), characterized in that, The upper mold (1) is provided with a protruding first mold core (11) and a second mold core (12) on the discharge side. The first mold core (11) and the second mold core (12) are arranged adjacent to each other and have a forming gap between them. The upper mold (1) is provided with a through flow divider hole, which includes an inward flow divider hole (13) located on both sides of the first mold core (11) and the second mold core (12). The inner side and the outer side of the inward flow divider hole (13) are inclined towards the first mold core (11) and the second mold core (12) in the direction from material inlet to material outlet. The flow divider hole also includes a middle flow divider hole (14), which corresponds to the forming gap between the first mold core (11) and the second mold core (12).

2. The inward-contraction force anti-outward-expansion extrusion mold according to claim 1, characterized in that, The size of the middle flow orifice (14) gradually decreases along the direction from feed to discharge.

3. The inward-contraction force anti-outward-expansion extrusion mold according to claim 2, characterized in that, The middle flow hole (14) is a rounded rectangle on the feed side. The length direction of the rounded rectangle is perpendicular to the length direction of the forming gap, and the forming gap is located in the middle of the length direction of the rounded rectangle. The middle flow hole (14) shrinks from both sides to the middle along the length direction from feed to discharge.

4. The inward-contracting force anti-outward-expansion extrusion mold according to claim 1, characterized in that, The diversion orifice also includes an outer diversion orifice (15), and the outer diversion orifice (15) and the inner diversion orifice (13) together constitute multiple diversion orifices surrounding the outer ring of the middle diversion orifice (14).

5. The inward-contraction force anti-outward-expansion extrusion die according to claim 4, characterized in that, The inner side of the outer diversion hole (15) is inclined toward the first mold core (11) and the second mold core (12) in the direction from material inlet to material outlet.

6. The inward-contraction anti-outward-expansion die according to any one of claims 1-5, characterized in that, Reinforcing blocks (16) are provided on both sides of the first mold core (11) and the second mold core (12) away from the molding gap.

7. The inward-contraction force anti-outward-expansion extrusion die according to any one of claims 1-5, characterized in that, The cross-sectional shape of the profile produced includes a first cavity (31) and a second cavity (32) corresponding to the first mold core (11) and the second mold core (12) respectively, and a thick-walled portion (33) located below the first cavity (31) and the second cavity (32); The upper mold (1) is also provided with a protruding guide cone (17) on the discharge side. The discharge side of the guide cone (17) is a cone that gradually narrows. The guide cone (17) corresponds to the thick wall part (33).

8. The inward-contraction force anti-outward-expansion extrusion die according to claim 7, characterized in that, The lower mold (2) is provided with a recessed welding chamber (21), and a mold hole (22) is provided in the welding chamber (21) that runs from the material inlet side to the material outlet side. The outline of the mold hole (22) is consistent with the outer outline of the cross-sectional shape of the profile produced. The discharge end of the guide cone (17) is located on the inlet side of the bottom plane of the welding chamber (21), and there is a discharge gap between the discharge end of the guide cone (17) and the bottom plane of the welding chamber (21). The size of the guide cone (17) is smaller than the part corresponding to the die hole (22) and the thick wall part (33).

9. The inward-contraction force anti-outward-expansion extrusion die according to claim 8, characterized in that, The lower mold (2) is also provided with a protruding flow-blocking strip (23) on the material inlet side. The flow-blocking strip (23) is provided around the part corresponding to the mold hole (22) and the thick wall part (33).

10. The inward-contraction force anti-outward-expansion die according to any one of claims 1-5, characterized in that, A mold pad (4) is also provided on the discharge side of the lower mold (2), and the mold pad (4) has a mold pad discharge hole (41) that is connected to the discharge side of the mold hole (22).

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