Extrusion die for conical radial and crescent shunt bridges

Abstract

The utility model discloses an extrusion die of an excitation cone radial and crescent shunting bridge, which comprises an upper die, the upper die is provided with shunting holes penetrating from a feeding side to a discharging side, the shunting bridge is arranged between the shunting holes, the extrusion die is characterized in that the feeding side of the upper die is provided with a sunken sinking groove, and the longitudinal section of the sinking groove is arc-shaped; a protruding excitation cone is arranged in the center of the feeding side of the upper die, and the longitudinal section of the excitation cone is in a circular arc shape or a cone shape. The plurality of shunting bridges are radially distributed on the circumferential periphery of the excitation cone; on the feeding side of the upper die, the connecting position of the shunting bridge and the excitation cone is a smooth transition surface. According to the scheme, the arc (crescent) buffer is arranged at the feeding position, the protruding excitation cone is arranged at the center, meanwhile, the diversion bridge adopts a radial bridge position mode, diversion and feeding of raw material aluminum bars are facilitated, and therefore the extrusion speed is increased under the condition that the forming quality of aluminum profiles is guaranteed, rapid production is achieved, and the production efficiency is improved. And the device is particularly suitable for large-size round pipe profiles.

Description

Technical Field

[0001] The utility model belongs to the technical field of extrusion dies, and in particular relates to an extrusion die with a cone-shaped radial and crescent-shaped shunt bridge. Background Art

[0002] Existing aluminum profile extrusion dies, such as the one shown in the Chinese utility model patent with authorization announcement number CN202606557U, have a flat feeding side of the upper die, which is not conducive to feeding the raw aluminum rod. Especially for the production of large-sized round tube-type profiles, the extrusion die will be subjected to great pressure during feeding, and the existing structure cannot meet the needs of fast and stable feeding. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an extrusion die with a cone-shaped radial and crescent-shaped diverter bridge, so as to solve the problems of the existing extrusion die being subjected to high pressure, difficult to produce quickly, and difficult to ensure feeding, and to achieve sufficient buffering effect on the feeding side, which is conducive to the feeding of aluminum bars.

[0004] According to the technical solution of the present invention, the present invention provides an extrusion die with a radial cone and a crescent-shaped diverter bridge, including an upper die, the upper die having diverter holes running through from the feed side to the discharge side, and diverter bridges between the diverter holes. The die is characterized in that a concave sinking groove is provided on the feed side of the upper die, and the longitudinal section of the sinking groove is arc-shaped; a convex cone is provided at the center of the feed side of the upper die, and the longitudinal section of the cone is arc-shaped or conical; a plurality of diverter bridges are radially distributed on the circumferential periphery of the cone; on the feed side of the upper die, the connection between the diverter bridge and the cone is a smooth transition surface.

[0005] Furthermore, on the feeding side of the upper die, the width of the diverter bridge gradually increases from near the excitation cone to the outside.

[0006] Furthermore, the longitudinal section of the diverter bridge is in the shape of a teardrop, with the feed side being narrower than the discharge side and the shape gradually transitioning from the feed side to the discharge side.

[0007] Furthermore, a mold core is provided in the middle of the upper mold, and the mold core smoothly transitions to a cone on the feeding side; a plurality of diversion bridges and diversion holes are radially distributed on the circumferential periphery of the mold core.

[0008] Furthermore, a blind hole is provided at the center of the discharge side of the mold core, and the sidewalls and bottom of the blind hole are both smooth curved surfaces.

[0009] Furthermore, the diversion hole is an outwardly expanding inclined hole in the direction from the inlet side to the outlet side.

[0010] Furthermore, it also includes a lower mold matching the upper mold, the lower mold has a recessed welding chamber on the feeding side, the welding chamber has a die hole that passes through in the direction from the feeding side to the discharging side, and the feeding side of the welding chamber is connected to the discharging side of the upper mold.

[0011] Furthermore, the welding chamber gradually shrinks inwards from the feeding side to the discharging side, and the longitudinal section of the welding chamber is a rounded trapezoid.

[0012] Furthermore, the mold core and the mold hole are both circular, and the profiles produced by the extrusion molds of the cone-shaped radial and crescent-shaped diverter bridges are round tubes.

[0013] Furthermore, on the discharge side of the lower die, a first-level empty knife, a second-level empty knife and a third-level empty knife are sequentially provided outside the die hole.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0015] To sum up, the extrusion die of the utility model with radial cone and crescent-shaped diverter bridge has an arc (crescent-shaped) buffer at the feeding point and a protruding cone at the center. At the same time, the diverter bridge adopts a radial bridge position. The principle of the cone is similar to the straightening cone of an aircraft engine, which is beneficial to the diversion of the raw aluminum rod, thereby helping to increase the extrusion speed and achieve rapid production while ensuring the forming quality of the aluminum profile, and is especially suitable for larger round tube-type profiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the longitudinal cross-sectional structure of the upper mold according to one embodiment of the present utility model.

[0017] Figure 2 It is a perspective structural diagram of an extrusion die according to an embodiment of the present utility model.

[0018] Figure 3 It is a schematic cross-sectional structural diagram of an extrusion die according to an embodiment of the present utility model.

[0019] Figure 4 It is a schematic diagram of the longitudinal cross-sectional structure of a diverter bridge according to an embodiment of the present utility model.

[0020] Description of reference numerals in the accompanying drawings:

[0021] 1. Upper die; 2. Diverter hole; 3. Diverter bridge; 4. Sinking groove; 5. Stir cone; 6. Transition surface; 7. Mold core; 8. Blind hole; 9. Lower die; 10. Welding chamber; 11. Mold hole; 12. First-level blanking tool; 13. Second-level blanking tool; 14. Third-level blanking tool. DETAILED DESCRIPTION

[0022] The utility model provides an extrusion die with a cone-shaped radial and crescent-shaped diverter bridge, which solves the problems of high pressure on existing extrusion dies, difficulty in rapid production, and difficulty in ensuring feeding, and realizes sufficient buffering effect on the feeding side, which is beneficial to the feeding of aluminum bars.

[0023] See also Figures 1 to 3 In one embodiment of the utility model, an extrusion die for a cone-shaped radial and crescent-shaped diverter bridge includes an upper die 1, and the upper die 1 has diverter holes 2 that pass through in the direction from the feed side to the discharge side, and a diverter bridge 3 between the diverter holes 2. On the feed side of the upper die 1, there is a concave, preferably circular, sinking groove 4, and the longitudinal section of the sinking groove 4 is an arc shape. The sinking groove 4 is equivalent to cutting off the feed side of the original diverter bridge, or in other words, the feed side of the diverter bridge 3 forms the sinking groove 4. The key point is that there is an arc buffer at the feed point, and there is a drop in the way of sinking. The overall arc of the sinking is not a slant line but a circular arc, such as Figure 3 As shown, this kind of arc sinking can be intuitively called a crescent-shaped structure. At the same time, at the center of the feeding side of the upper mold 1 (that is, the bottom and center of the sinking groove 4), there is a protruding, preferably circular, cone 5, the longitudinal section of the cone 5 is arc-shaped or conical, and the cross-section of the cone 5 gradually increases from the discharge side to the feeding side. Correspondingly, a plurality of diverter bridges 3 are radially distributed on the circumferential periphery of the cone 5. The role played by the cone 5 is similar to that of the straightening cone of the aircraft engine, which helps to divert the raw aluminum rod into the feed. More specifically, the junction between the diverter bridge 3 and the cone 5 has a transition section similar to a chamfer, so that Figure 1 As shown, at the feeding side of the upper mold 1, the junction between the diverter bridge 3 and the excitation cone 5 is a smooth transition surface 6, so that the diverter bridge 3 and the excitation cone 5 present a smooth S-shaped curve as a whole.

[0024] Furthermore, if Figure 2 As shown, on the inlet side of the upper mold 1, the width of the diverter bridges 3 gradually increases from near the excitation cone 5 outward. In this embodiment, the radial arrangement of the diverter bridges 3 is reflected in two aspects: first, multiple diverter bridges 3 are arranged radiating outward from the center, for example, five or six diverter bridges 3 are provided; second, the diverter bridges 3 are narrower near the excitation cone 5 and wider toward the outside. This arrangement helps improve pressure on the inlet side of the mold, reducing the difference in feed volume between the inner and outer sides, making feeding easier and more uniform.

[0025] In some embodiments, the bridge position of the diverter bridge 3 changes gradually from small to large, with the inlet side being thinner and the outlet side being larger; for example Figure 4 As shown, the longitudinal section of the diverter bridge 3 is in the shape of a teardrop with the feed side narrower than the discharge side and a gradual transition from the feed side to the discharge side; this further helps the feed side raw materials enter the diverter hole 2.

[0026] More specifically, the upper mold 1 has a core 7 in the middle, with a working band on the discharge side. The core 7 smoothly transitions to a cone 5 on the inlet side. Multiple diverter bridges 3 and diverter holes 2 are radially distributed around the circumference of the core 7, thus forming the integrally formed structure of the upper mold 1. Preferably, a blind hole 8 is provided at the center of the discharge side of the core 7. The sidewalls and bottom of the blind hole 8 are both smoothly curved surfaces, such as cylindrical sidewalls and a hemispherical bottom. The blind hole 8 can reduce deformation of the core 7 and save material in the upper mold 1. The diverter holes 2 are inclined holes that expand outward from the inlet side to the discharge side, allowing the aluminum material to flow outward, corresponding to the larger size of the profile to be formed.

[0027] The extrusion die also includes a lower die 9 that matches the upper die 1. The lower die 9 has a recessed welding chamber 10 on the feeding side. The welding chamber 10 has a die hole 11 that passes through from the feeding side to the discharging side. The feeding side of the welding chamber 10 is connected to the discharging side of the upper die 1 to form a continuous transition side. Figure 3 As shown, the welding chamber 10 gradually shrinks inward from the feeding side to the discharging side. The longitudinal section of the welding chamber 10 is a rounded trapezoid, and the waist of the rounded trapezoid has a large inclination angle, which provides a diversion effect and is more conducive to the welding of aluminum material and the flow to the die hole 11.

[0028] See also Figure 2 In an embodiment particularly suitable for adopting the present scheme, the mold core 7 and the mold hole 11 are both circular, and the profile produced by the extrusion mold is a round tube; the contours of the welding chamber 10, the sinking groove 4, the mold hole 11, the extrusion cone 5, and the blind hole 8 are all circular, and the sizes of the circles are preferably decreasing in sequence as shown in the figure.

[0029] See also Figure 3 Preferably, on the discharge side of the lower die 9, a first-level empty knife 12, a second-level empty knife 13 and a third-level empty knife 14 are sequentially provided outside the die hole 11. The shapes of the first-level empty knife 12, the second-level empty knife 13 and the third-level empty knife 14 are adapted to the die hole 11 (for example, they are all circular) and their sizes gradually increase; the use of this multi-level empty knife method can avoid surface extrusion marks and extrusion lines caused by friction with the die when the profile is discharged.

[0030] To sum up, the extrusion die of the utility model with radial cone and crescent-shaped diverter bridge has an arc (crescent-shaped) buffer at the feeding point and a protruding cone at the center. At the same time, the diverter bridge adopts a radial bridge position. The principle of the cone is similar to the straightening cone of an aircraft engine, which is beneficial to the diversion of the raw aluminum rod, thereby helping to increase the extrusion speed and achieve rapid production while ensuring the forming quality of the aluminum profile, and is especially suitable for larger round tube-type profiles.

Claims

1. An extrusion die for producing a cone-shaped radial and crescent-shaped diverter bridge, comprising an upper die (1), the upper die (1) having diverter holes (2) extending from the feed side to the discharge side, and diverter bridges (3) between the diverter holes (2), characterized in that: A concave sink groove (4) is provided on the feeding side of the upper die (1), and the longitudinal section of the sink groove (4) is in the shape of an arc; a convex excitation cone (5) is provided at the center of the feeding side of the upper die (1), and the longitudinal section of the excitation cone (5) is in the shape of an arc or a cone; a plurality of diverter bridges (3) are radially distributed around the circumference of the excitation cone (5); on the feeding side of the upper die (1), the connection between the diverter bridge (3) and the excitation cone (5) is a smooth transition surface (6).

2. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 1, characterized in that: On the feeding side of the upper die (1), the width of the diverter bridge (3) gradually increases from the vicinity of the excitation cone (5) toward the outside.

3. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 1, characterized in that: The longitudinal section of the diverter bridge (3) is in the shape of a teardrop, with the feed side being narrower than the discharge side and the transition gradually from the feed side to the discharge side.

4. The extrusion die of the cone-shaped radial and crescent-shaped diverter bridge according to any one of claims 1 to 3, characterized in that: The middle part of the upper mold (1) is provided with a mold core (7), which smoothly transitions to a cone (5) on the feeding side; a plurality of diversion bridges (3) and diversion holes (2) are radially distributed on the circumference of the mold core (7).

5. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 4, characterized in that: A blind hole (8) is provided at the center of the discharge side of the mold core (7), and the side wall and bottom of the blind hole (8) are both smooth curved surfaces.

6. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 4, characterized in that: The diversion hole (2) is an outwardly expanding inclined hole in the direction from the inlet side to the outlet side.

7. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 6, characterized in that: The invention also includes a lower die (9) matched with the upper die (1), wherein the feeding side of the lower die (9) has a recessed welding chamber (10), and the welding chamber (10) has a die hole (11) that passes through in the direction from the feeding side to the discharging side, and the feeding side of the welding chamber (10) is connected to the discharging side of the upper die (1).

8. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 7, characterized in that: The welding chamber (10) gradually shrinks inwards from the feeding side to the discharging side, and the longitudinal section of the welding chamber (10) is a rounded trapezoid.

9. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 8, characterized in that: The die core (7) and the die hole (11) are both circular, and the profiles produced by the extrusion dies of the cone-shaped radial and crescent-shaped diversion bridges are round tubes.

10. The extrusion die of the cone radial and crescent shaped diverter bridge according to claim 9, characterized in that: On the discharge side of the lower die (9), a first-level empty knife (12), a second-level empty knife (13) and a third-level empty knife (14) are sequentially arranged outside the die hole (11).

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