A cavity feed insert-mold extrusion molding die

Abstract

The utility model relates to the field of extrusion forming die, especially a die-in-die extrusion forming die with inner cavity feeding. The utility model wants to solve the technical problem to provide a die-in-die extrusion forming die with inner cavity feeding which can effectively promote the full welding of metal flow and effectively improve the welding quality. The die-in-die extrusion forming die with inner cavity feeding comprises an upper die and a lower die, the upper die and the lower die are in butt joint to form a metal runner, a die core is fixedly arranged at the center of the butt joint end face of the upper die, the lower die is provided with a welding chamber and a die hole matched with the butt joint end face of the upper die, the end of the die core extends into the die hole of the lower die, and the end profile of the die core and the die hole jointly constitute a working belt for forming the inner wall of a product; an inner cavity is arranged on the die core and is communicated with the external welding chamber. The utility model achieves the effect of effectively promoting the full welding of metal flow and effectively improving the welding quality.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molding dies, and in particular to a die-in-die extrusion molding die with internal cavity feeding. Background Technology

[0002] In non-ferrous metal extrusion processing, the flow divider die is a key piece of equipment for producing hollow profiles. Traditional single-layer flow divider extrusion dies use a flow divider bridge to split the metal billet into multiple streams, which flow into the welding chamber and re-merge to form a whole material flow that surrounds the die core. Finally, the material is extruded through the working zone formed by the die core and the die holes to form a hollow product. However, this traditional structure has inherent limitations: its flow divider holes are only set around the outer periphery of the die core, and all the metal material flow is guided to the outside of the die core. It is difficult to feed material into the cavity inside the die core to the outer contour of the formed product. This means that for any profile that requires independent partitions, reinforcing ribs, or complex internal cavity structures, such traditional single-layer feeding dies are difficult to form. Therefore, there is an urgent need to develop a die-in-die extrusion forming die with internal cavity feeding that can effectively promote the full welding of the metal material flow and effectively improve the welding quality. Utility Model Content

[0003] In order to overcome the shortcomings of traditional extrusion molding dies, where the flow diversion holes are only set around the outer periphery of the die core, all metal flow is guided to the outside of the die core, and the outer wall contour of the molded product is difficult to supply material to the cavity inside the die core, the present invention aims to provide a die-in-die extrusion molding die with internal cavity feeding that can effectively promote the full welding of metal flow and effectively improve the welding quality.

[0004] This utility model is achieved by the following specific technical means: A die-in-die extrusion molding die with internal cavity feeding includes an upper die and a lower die. The upper die and the lower die are mated to form a metal flow channel. A die core is fixedly disposed at the center of the mating end face of the upper die. The lower die is provided with a welding chamber and a die hole that mate with the mating end face of the upper die. The end of the die core extends into the die hole of the lower die, and the contour of the die core end and the die hole together form a working zone for molding the inner wall of the product. The die core is provided with an internal cavity that communicates with the external welding chamber. The upper mold is provided with a first diversion hole group and a second diversion hole group; the first diversion hole group consists of multiple diversion holes evenly distributed around the circumference of the mold core, one end of which extends to the back of the upper mold and the other end extends to the mating end face of the upper mold and is connected to the welding chamber, for feeding material to the periphery of the mold core; the second diversion hole group consists of multiple diversion holes evenly distributed around the circumference and located inside the first diversion hole group, one end of which extends to the back of the upper mold and the other end is connected to the inner cavity of the mold core, for feeding material to the inner cavity of the mold core; the inner wall of the welding chamber corresponds to the position of the metal flow welding line generated by each diversion hole of the first diversion hole group, and several flow-blocking blocks protruding towards the center are equidistantly distributed in a ring around the center of the welding chamber; the inner cavity provided on the mold core has a conical transition structure along the extrusion direction.

[0005] Furthermore, the diversion holes in the first diversion hole group and the second diversion hole group are inclined along the extrusion direction.

[0006] Furthermore, the flow-blocking block is an arc-shaped block that matches the curvature of the inner wall of the welding chamber, and the root connected to the inner wall of the welding chamber is provided with a rounded arc.

[0007] Furthermore, the sum of the feeding areas of the second diversion orifice group is less than the sum of the feeding areas of the first diversion orifice group.

[0008] Furthermore, the first and second diversion hole groups are arranged in a concentric ring at the entrance on the back side of the upper mold.

[0009] Compared with the prior art, the present invention has the following beneficial effects: This invention effectively promotes the full welding of metal flow and improves welding quality. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 2 This is a cross-sectional view of the present invention.

[0012] The labels in the attached diagram are: 1-upper mold, 2-lower mold, 11-mold core, 12-inner cavity, 13-first diversion hole group, 14-second diversion hole group, 21-welding chamber, 22-mold hole, 23-flow blocking block. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings: Example

[0014] A die-in-die extrusion molding die with internal cavity feeding, such as Figure 1-2As shown, the device includes an upper mold 1 and a lower mold 2. The upper mold 1 and the lower mold 2 are mated together to form a metal flow channel. A mold core 11 is fixedly provided at the center of the mating end face of the upper mold 1. The lower mold 2 is provided with a welding chamber 21 and a mold hole 22 that mate with the mating end face of the upper mold 1. The end of the mold core 11 extends into the mold hole 22 of the lower mold 2. The outline of the end of the mold core 11 and the mold hole 22 together form a working zone for molding the inner wall of the product. An inner cavity 12 that communicates with the external welding chamber 21 is provided on the mold core 11. The upper mold 1 is provided with a first diversion hole group 13 and a second diversion hole group 14. The first diversion hole group 13 is composed of a plurality of diversion holes evenly distributed around the mold core 11 in the circumferential direction. One end of the diversion hole group 13 extends to the back of the upper mold 1, and the other end extends to the mating end face of the upper mold 1 and is connected to the welding chamber 21. It is used to supply material to the periphery of the mold core 11. The second diversion hole group 14 is composed of a plurality of diversion holes evenly distributed in the circumferential direction and located inside the first diversion hole group 13. One end of the diversion hole group 14 extends to the back of the upper mold 1, and the other end is connected to the inner cavity 12 of the mold core 11. It is used to supply material to the inner cavity 12 of the mold core 11. The inner wall of the welding chamber 21 corresponds to the position of the metal flow welding line generated by each diversion hole of the first diversion hole group 13. Several flow-blocking blocks 23 protruding towards the center are equidistantly distributed in a ring around the center of the welding chamber 21. The inner cavity 12 provided on the mold core 11 has a conical transition structure along the extrusion direction.

[0015] Working principle: Under the pressure of the extruder, the metal billet simultaneously enters the first diversion hole group 13 and the second diversion hole group 14 from the back of the upper die 1. The diversion holes of the first diversion hole group 13 guide the metal flow and inject it into the welding chamber 21 formed after the upper die 1 and the lower die 2 are joined. Multiple metal flows are re-welded under high pressure in the welding chamber 21 to form an overall flow surrounding the die core 11. The flow-blocking blocks 23 distributed in a ring on the inner wall of the welding chamber 21 act critically on the welding line area of ​​the flow. By increasing local resistance and changing the direction of metal flow, they effectively disrupt the original linear welding interface, promote more complete diffusion and fusion between metal flows, thereby significantly improving the welding quality and eliminating visible welding line defects. The diversion holes of the second diversion hole group 14 direct part of the metal flow... The material is fed into the inner cavity 12 of the die core 11. The tapered transition structure of the inner cavity 12 of the die core 11 guides and compresses this part of the material flow. Subsequently, the metal flow formed by the first diversion hole group 13 and wrapped around the outside of the die core 11, together with the metal flow flowing out from the inner cavity 12 of the die core 11, are squeezed through the working belt formed by the end contour of the die core 11 and the die hole 22 of the lower die 2. In this final forming stage, the inner and outer material flows finally merge and weld at the end of the die core 11 under high pressure. By precisely controlling the feeding ratio, tilt angle and length of the working belt of the two diversion holes, the flow rate of the inner and outer metals can be precisely balanced to ensure that the extruded products have uniform wall thickness, accurate dimensions and high surface quality, which is especially suitable for the production of hollow profiles with complex cross sections.

[0016] In summary, through its unique dual-flow channel design, the flow-blocking structure of the welding chamber 21, and the conical design of the inner cavity 12 of the mold core 11, the mold works synergistically to achieve reasonable distribution of metal flow, full welding, and smooth extrusion, ultimately achieving the goal of efficient production of high-quality complex hollow profiles.

[0017] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.

Claims

1. A die-in-die extrusion molding die with internal cavity feeding, characterized in that, The device includes an upper mold (1) and a lower mold (2). The upper mold (1) and the lower mold (2) are mated together to form a metal flow channel. A mold core (11) is fixedly provided at the center of the mating end face of the upper mold (1). The lower mold (2) is provided with a welding chamber (21) and a mold hole (22) that are mated with the mating end face of the upper mold (1). The end of the mold core (11) extends into the mold hole (22) of the lower mold (2). The end contour of the mold core (11) and the mold hole (22) together form a working zone for molding the inner wall of the product. An inner cavity (12) is provided on the mold core (11) that is connected to the external welding chamber (21). The upper mold (1) is provided with a first diversion hole group (13) and a second diversion hole group (14); the first diversion hole group (13) is composed of a plurality of diversion holes evenly distributed around the mold core (11) in the circumferential direction, one end of which extends to the back of the upper mold (1) and the other end extends to the mating end face of the upper mold (1) and is connected to the welding chamber (21), for feeding material to the outside of the mold core (11); the second diversion hole group (14) is composed of a plurality of diversion holes evenly distributed in the circumferential direction and located inside the first diversion hole group (13). One end of it extends through to the back of the upper mold (1), and the other end is connected to the inner cavity (12) of the mold core (11) for feeding material into the inner cavity (12) of the mold core (11); the inner wall of the welding chamber (21) corresponds to the position of the metal flow welding line generated by each of the first diversion hole group (13), and several flow blocking blocks (23) protruding towards the center are distributed in a ring at equal intervals around the center of the welding chamber (21); the inner cavity (12) provided on the mold core (11) has a conical transition structure along the extrusion direction.

2. The die-in-die extrusion molding die with internal cavity feeding according to claim 1, characterized in that, The diversion holes in the first diversion hole group (13) and the second diversion hole group (14) are inclined along the extrusion direction.

3. The die-in-die extrusion molding die with internal cavity feeding according to claim 1, characterized in that, The flow-blocking block (23) is an arc-shaped block that matches the curvature of the inner wall of the welding chamber (21), and the root connected to the inner wall of the welding chamber (21) is provided with a rounded arc.

4. The die-in-die extrusion molding die with internal cavity feeding according to claim 1, characterized in that, The sum of the feeding areas of the second diversion hole group (14) is less than the sum of the feeding areas of the first diversion hole group (13).

5. The die-in-die extrusion molding die with internal cavity feeding according to claim 1, characterized in that, The first diversion hole group (13) and the second diversion hole group (14) are arranged in a concentric ring at the entrance on the back side of the upper mold (1).

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