Special diversion die for thin-walled porous profiles

Abstract

A special diverter die for thin-walled porous profiles comprises a lower die, a middle die and an upper die which are stacked and connected in sequence from bottom to top; a die hole is provided on the lower die, a die core A is provided on the upper die, and a die core B is provided on the middle die; the die hole of the lower die is used to shape the outer wall of the profile, and the die core A of the upper die and the die core B of the middle die are used together to shape the inner wall of the profile. The advantage of the present invention is that a diverter die with a three-part structure is adopted, which, on the one hand, prolongs the flow path of the material. On the premise of prolonging the path, multiple drainage and speed regulating structures are dispersedly arranged along the axial direction, thereby balancing the material flow rate during the extrusion process and solving the molding quality defects caused by uneven material flow rate. On the other hand, the die cores are dispersed on the upper die and the middle die, and the inner wall of the profile is formed together by the die cores on the upper die and the middle die, thereby dispersing the extrusion force and improving the service life of the die.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, in particular to a special flow divider mould for thin-walled porous profiles. Background Art

[0002] The diverter die is suitable for manufacturing perforated profiles. Its structure consists of two parts: an upper die and a lower die. The upper die generally functions to divert the ingot through the diverter hole and to shape the inner wall of the hole of the perforated profile through the die core. The lower die generally functions to gather the metal material flowing out of the diverter hole of the upper die through the welding chamber and to shape the outer wall of the hole of the perforated profile through the die hole (the die hole is directly connected to the welding chamber).

[0003] During the operation of the diverter die, the material at the center of the diverter hole of the upper die flows smoothly with a relatively fast flow rate, while the material at the edge of the diverter hole is blocked by the diverter bridge (the partition between adjacent diverter holes is called the diverter bridge) and flows relatively slowly. This difference in flow rate will cause uneven wall thickness, distortion or failure to extrude the molded part, which is an inherent defect caused by the structure of the diverter die itself.

[0004] When the manufactured profile is a thin-walled porous profile, this inherent defect will be further amplified, greatly increasing the difficulty of manufacturing thin-walled porous profiles. On the one hand, the upper mold mainly bears the extrusion pressure of metal flow through the mold core. When the number of holes in the manufactured profile increases, the number of mold cores also needs to be adaptively increased (the number of mold cores is consistent with the number of holes in the porous profile), which will cause the extrusion pressure on the upper mold to increase accordingly, making the upper mold more prone to elastic deformation, plastic deformation and overall distortion, resulting in dimensional deviation of the molded part. On the other hand, when the wall thickness of the manufactured profile is thin, the gap between the mold core working zone of the upper mold and the mold hole working zone of the lower mold will also be relatively small, and the passability (or fluidity) of the metal material between the two working zones will also be relatively poor, which will cause the extrusion pressure on the upper mold to increase accordingly, making the upper mold more prone to elastic deformation, plastic deformation and overall distortion, resulting in dimensional deviation of the molded part.

[0005] The energy-absorbing box is a component located on the front and rear anti-collision beams of the car and is a typical thin-walled porous profile. Fig. 9 As shown, the buffer energy absorption box includes an inner layer profile split 41, an outer layer profile split 42 and a reinforcing rib 43. The inner layer profile split 41 is arranged inside the outer layer profile split 42, and a central hole is arranged therein. A plurality of reinforcing ribs 43 are evenly distributed in a radial annular shape outside the inner layer profile split 41, one side of which is fixedly connected to the inner wall of the outer layer profile split 42, and the other side of which is fixedly connected to the outer wall of the inner layer profile split 41, and a plurality of process holes are separated by the reinforcing ribs 43 from the annular area between the inner layer profile split 41 and the outer layer profile split 42.

[0006] When a conventional two-split diverter die (upper die + lower die) is used to extrude and manufacture a buffer energy absorbing box, the reinforcement ribs of the buffer energy absorbing box will be difficult to form due to severe lack of material supply, the inner layer profile split will have a thinner wall due to relatively less material supply, and the outer layer profile split will be twisted due to excessive material supply, resulting in the molded part being unable to meet the process requirements. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a special diverter die for thin-walled porous profiles, which to a certain extent alleviates the inherent defect of uneven material flow rate in the existing diverter die, thereby solving the problem that the existing diverter die is difficult to manufacture thin-walled porous profiles.

[0008] The technical solution of the present invention is: a special diverter die for thin-walled porous profiles, comprising a lower die, a middle die and an upper die which are stacked and connected in sequence from bottom to top; a die hole is provided on the lower die, a die core A is provided on the upper die, and a die core B is provided on the middle die; the die hole of the lower die is used to shape the outer wall of the profile, and the die core A of the upper die and the die core B of the middle die are used together to shape the inner wall of the profile.

[0009] A further technical solution of the present invention is: the middle mold includes a main body B and a mold core B; a confluence hole A and a plurality of diversion holes B are provided on the main body B, a diversion bridge B is formed between adjacent diversion holes B, the confluence hole A and the diversion hole B both pass through the upper and lower end surfaces of the main body B, a plurality of mold cores B are arranged at intervals at the lower end of the main body B, and enclose the confluence hole B, the confluence hole B is connected with the confluence hole A to form a confluence channel, and the mold core B is provided with a second working belt and a second empty knife belt in sequence from top to bottom on the side facing the confluence channel; the mold core B is provided with a third working belt and a third empty knife belt in sequence from top to bottom on the side facing away from the confluence channel; a drainage channel, a molding gap and an empty knife gap are provided between two adjacent mold cores B from top to bottom, the two ends of the drainage channel are respectively connected with the diversion hole B and the confluence channel, the two ends of the molding gap are respectively connected with the lower space of the diversion hole B and the confluence channel, and the two ends of the empty knife gap are respectively connected with the lower space of the diversion hole B and the confluence channel;

[0010] The upper mold includes a main body A, a connecting column and a mold core A; the main body A is provided with a plurality of diverter holes A, and a diverter bridge A is formed between adjacent diverter holes A. The diverter holes A penetrate the upper and lower end surfaces of the main body A, and each diverter hole A is respectively connected to a part of the edge area of ​​the confluence hole A. The upper end of the connecting column is fixedly connected to the lower end surface of the main body A, and the mold core A is fixedly connected to the lower end of the connecting column. The mold core A is sequentially provided with a first working belt and a first empty knife belt from top to bottom;

[0011] The lower die includes a main body C; the main body C is provided with a welding chamber and a die hole which are connected in sequence from top to bottom; an annular surface is provided at the junction of the welding chamber and the die hole; a plurality of flow-blocking blocks are evenly distributed in an annular shape at the inner edge of the annular surface; the die hole includes a fourth working belt and a fourth empty knife belt which are connected in sequence from top to bottom; an upper port of the welding chamber is connected to an upper end surface of the main body C; and a lower port of the die hole is connected to a lower end surface of the main body C;

[0012] The core A of the upper mold extends into the confluence channel of the middle mold, the first working belt on the core A is opposite to the second working belt in the confluence channel, and the first empty knife belt on the core A is opposite to the second empty knife belt in the confluence channel; the diversion hole A of the upper mold and the diversion hole B of the middle mold form a one-to-one correspondence up and down, and each diversion hole A of the upper mold is opposite to the edge area of ​​the confluence hole A of the middle mold at the edge area close to the diversion bridge A; the lower mold contains all the cores B of the middle mold through the welding chamber and the mold hole, the fourth working belt in the mold hole is opposite to the third working belt on the core B, and the fourth empty knife belt in the mold hole is opposite to the third empty knife belt on the core B; the welding chamber of the lower mold is located directly below all the diversion holes B in the middle mold.

[0013] A further technical solution of the present invention is: a plurality of drainage notches are evenly distributed in a ring shape at the upper edge of the confluence hole A, the drainage notches include a transition surface and a drainage surface that are smoothly connected from top to bottom, the upper edge of the transition surface is smoothly transitionally connected to the upper end surface of the main body B, and the lower edge of the drainage surface is connected to the hole wall surface of the confluence hole A; the drainage notch and the diversion hole A of the upper mold form a one-to-one correspondence relative to each other, and are used to receive the metal material extruded by the diversion hole A in the area near the diversion bridge A.

[0014] A further technical solution of the present invention is that the angle formed between the drainage surface and the center line of the middle mold is a, and the value range of a is 23-25°.

[0015] A further technical solution of the present invention is that the angle a is 24°.

[0016] A further technical solution of the present invention is: the drainage channel is provided with a bell-mouth section A, a transition section and a bell-mouth section B in sequence from one end connected to the diversion hole B to the end connected to the converging channel, the end of the bell-mouth section A connected to the transition section is a small-diameter end, the end of the bell-mouth section A connected to the diversion hole B is a large-diameter end, the end of the bell-mouth section B connected to the transition section is a small-diameter end, and the end of the bell-mouth section B connected to the converging channel is a large-diameter end.

[0017] A further technical solution of the present invention is that the bell mouth section A includes an upper inclined surface, side inclined surfaces connected to both sides of the upper inclined surface, and a bottom plane connected to the lower ends of the two side inclined surfaces, and the angle formed between the upper inclined surface of the bell mouth section A and the center line of the middle mold is β, and the value range of β is 29-31°.

[0018] A further technical solution of the present invention is that the angle β is 30°.

[0019] A further technical solution of the present invention is that the lower die is provided with an annular surface at the junction of the welding chamber and the die hole, and a plurality of flow-blocking blocks are evenly distributed in an annular shape at the inner edge of the annular surface.

[0020] A further technical solution of the present invention is: it is used to manufacture a buffer energy absorption box, which includes an inner layer profile split, an outer layer profile split and reinforcing ribs; the inner layer profile split is arranged inside the outer layer profile split, and a central hole is arranged therein; the outer layer profile split includes a conventional thickness area and a thickened area arranged alternately; a plurality of reinforcing ribs are radially annularly distributed outside the inner layer profile split, one side of which is fixedly connected to the inner wall of the outer layer profile split, and the other side of which is fixedly connected to the outer wall of the inner layer profile split, and a plurality of process holes are separated by the reinforcing ribs in the annular area between the inner layer profile split and the outer layer profile split;

[0021] When the wall thickness of the reinforcement rib is 1.5mm, the length of the molding gap is 2.4-2.6mm; when the wall thickness of the inner layer profile split is 2.4mm, the length of the first working band is 3-4mm, and the length of the second working band is 3-4mm; when the wall thickness of the conventional thickness zone of the outer layer profile split is 2.4mm, the length of the third working band is 4.5-5.5mm, and the length of the fourth working band is 4.5-5.5mm; when the wall thickness of the thickened zone of the outer layer profile split is 3.38mm; the length of the third working band is 7.0-7.5mm, and the length of the fourth working band is 7.0-7.5mm; the reinforcement rib is molded through the molding gap, the outer layer profile split is molded together by the fourth working band and the third working band, and the inner layer profile split is molded together by the first working band and the second working band.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. It is suitable for hot extrusion molding of thin-walled porous profiles. It adopts a three-part diverter die. On the one hand, it extends the flow path of the material. On the premise of extending the path, multiple drainage and speed regulation structures are dispersedly arranged along the axial direction, thereby balancing the material flow rate during the extrusion process and solving the molding quality defects caused by uneven material flow rate. On the other hand, the mold cores are dispersed on the upper mold and the middle mold, and the inner wall of the profile is formed together by the mold cores on the upper mold and the middle mold, thereby dispersing the extrusion force and improving the service life of the mold.

[0024] 2. In order to increase the material supply in the middle of the profile, a number of drainage notches are evenly distributed at the upper edge of the confluence hole A, which can improve the fluidity of the metal material in the diverter bridge A area of ​​the upper die (i.e. the axial middle area of ​​the diverter die), thereby reducing the flow velocity difference of the metal material at various locations in the same radial section of the diverter die, thereby improving the problem of thinning of the internal wall thickness of the porous profile during extrusion molding, and further improving the molding quality and molding stability of the profile.

[0025] 3. In order to increase the material supply of the reinforcing ribs inside the profile, a drainage channel connecting the converging channel with the diversion hole B is provided on the middle die. Both ends of the drainage channel are in a trumpet shape, which can respectively drain the metal material in the diversion hole B and the converging channel into the drainage channel, thereby increasing the material supply of the reinforcing ribs inside the profile, so that the reinforcing ribs can be formed normally, thereby improving the forming quality and forming stability of the profile.

[0026] 4. Based on the uneven material flow rate at different positions of the same radial section in the mold, working belts / molding gaps of different lengths are adaptively designed to achieve relative increase or decrease adjustment of the flow rate. Among them: 1. The molding gap is used to shape the reinforcing ribs inside the profile. The material supply at its location is relatively the least, so the relatively shortest length is designed to improve the material's passability. However, considering that too short a length will lead to unstable molding dimensions, poor molding quality, and reduced mold wear resistance, it is set to 2.5mm. 2. The fourth working belt and the third working belt are used together to shape the outer layer of the profile. The material supply at its location is relatively the most, so the relatively longest length is designed to reduce the material's passability. However, considering that too long a length will increase friction and extrusion pressure, resulting in burrs, scratches, hemp and other defects on the molding surface, it is set to 4.5-7.5mm.

[0027] The present invention is further described below in conjunction with the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 for Figure 1 A magnified view of part A;

[0030] Figure 3 This is a schematic diagram of the structure of the middle mold from a top view;

[0031] Figure 4 This is a schematic diagram of the structure of the middle mold when looking up;

[0032] Figure 5 for Figure 4 A magnified view of part B;

[0033] Figure 6 for Figure 4 Enlarged view of part C;

[0034] Figure 7 It is a structural schematic diagram of the upper die;

[0035] Figure 8 It is a structural schematic diagram of the lower mold;

[0036] Fig. 9 This is the radial cross-sectional structure diagram of the buffer energy absorption box.

[0037] Legend: main body B20; confluence hole A21; drainage gap 211; transition surface 2111; drainage surface 2112; diverter hole B22; diverter bridge B23; core B24; second working zone 242; second empty knife zone 243; third working zone 245; third empty knife zone 246; confluence hole B25; drainage channel 26; bell-mouth section A261; transition section 262; bell-mouth section B263; molding gap 27; empty knife gap 28; main body A10; diverter hole A11; connecting column 13; core A14; first working zone 141; first empty knife zone 142; main body C30; welding chamber 31; mold hole 32; fourth working zone 321; fourth empty knife zone 322; inner layer profile split 41; outer layer profile split 42; reinforcing rib 43. DETAILED DESCRIPTION

[0038] Embodiment 1:

[0039] like Figure 1-8 As shown, a special diverter die for thin-walled porous profiles includes an upper die, a middle die and a lower die.

[0040] The middle mold includes a main body B20 and a core B24. The main body B20 is provided with a confluence hole A21 and a plurality of diversion holes B22, and a diversion bridge B23 is formed between adjacent diversion holes B22. The confluence hole A21 and the diversion hole B22 both pass through the upper and lower end surfaces of the main body B20. Multiple cores B24 are arranged at intervals at the lower end of the main body B20, and enclose to form a confluence hole B25, and the confluence hole B25 is connected with the confluence hole A21 to form a confluence channel. The side of the core B24 facing the confluence channel is provided with a second working belt 242 and a second empty knife belt 243 from top to bottom. The side of the core B24 facing away from the confluence channel is provided with a third working belt 245 and a third empty knife belt 246 from top to bottom. Between two adjacent mold cores B24, there are provided a drainage channel 26, a molding gap 27 and an empty knife gap 28 which are connected in sequence from top to bottom. The two ends of the drainage channel 26 are respectively connected to the diverter hole B22 and the converging channel, the two ends of the molding gap 27 are respectively connected to the lower space of the diverter hole B22 and the converging channel, and the two ends of the empty knife gap 28 are respectively connected to the lower space of the diverter hole B22 and the converging channel.

[0041] The upper mold includes a main body A10, a connecting column 13 and a mold core A14. The main body A10 is provided with a plurality of diverter holes A11, and a diverter bridge A12 is formed between adjacent diverter holes A11. The diverter holes A11 penetrate the upper and lower end surfaces of the main body A10, and each diverter hole A11 is respectively connected to a part of the edge area of ​​the confluence hole A21. The upper end of the connecting column 13 is fixedly connected to the lower end surface of the main body A10, and the mold core A14 is fixedly connected to the lower end of the connecting column 13. The mold core A14 is sequentially provided with a first working belt 141 and a first empty knife belt 142 from top to bottom.

[0042] The lower mold includes a main body C30. The main body C is provided with a welding chamber 31 and a die hole 32 which are connected in sequence from top to bottom. An annular surface is provided at the junction of the welding chamber 31 and the die hole 32. A plurality of flow-blocking blocks 33 are evenly distributed in an annular shape at the inner edge of the annular surface. The die hole 32 includes a fourth working belt 321 and a fourth empty knife belt 322 which are connected in sequence from top to bottom. The upper port of the welding chamber 31 is connected to the upper end face of the main body C30, and the lower port of the die hole 32 is connected to the lower end face of the main body C30.

[0043] The lower mold, the middle mold and the upper mold are stacked and connected in sequence from bottom to top. Specifically, the core A14 of the upper mold extends into the confluence channel of the middle mold, the first working band 141 on the core A14 faces the second working band 242 in the confluence channel, and the first empty knife band 142 on the core A14 faces the second empty knife band 243 in the confluence channel. The diverter hole A11 of the upper mold forms a one-to-one correspondence with the diverter hole B22 of the middle mold, and each diverter hole A11 of the upper mold faces the edge area of ​​the confluence hole A21 of the middle mold at the edge area near the diverter bridge A12. The lower mold contains all the cores B24 of the middle mold through the welding chamber 31 and the mold hole 32, the fourth working band 321 in the mold hole 32 faces the third working band 245 on the core B24, and the fourth empty knife band 322 in the mold hole 32 faces the third empty knife band 246 on the core B24. The welding chamber 31 of the lower mold is located directly below all the diverter holes B22 of the middle mold.

[0044] Preferably, the upper mold, the middle mold and the lower mold are integrally formed.

[0045] Preferably, a plurality of drainage notches 211 are evenly distributed in a ring shape at the upper edge of the confluence hole A21. The drainage notches 211 include a transition surface 2111 and a drainage surface 2112 that are smoothly connected from top to bottom. The upper edge of the transition surface 2111 is smoothly transitionally connected to the upper end surface of the main body B20, and the lower edge of the drainage surface 2112 is connected to the hole wall surface of the confluence hole A21. The drainage notches 211 form a one-to-one correspondence with the diverter hole A11 of the upper die, and are used to receive the metal material extruded from the diverter hole A11 near the diverter bridge A area. Based on the design of the drainage notches 211, the fluidity of the metal material in the diverter bridge A area of ​​the upper die (i.e., the axial middle area of ​​the diverter die) can be improved, thereby reducing the flow velocity difference of the metal material at each location of the same radial cross section of the diverter die, thereby improving the problem of thinning of the internal wall thickness of the porous profile during extrusion molding, thereby improving the molding quality and molding stability of the profile.

[0046] Preferably, the drainage channel 26 is provided with a bell-mouth section A261, a transition section 262 and a bell-mouth section B263 in sequence from one end connected to the diverter hole B22 to one end connected to the converging channel, the end where the bell-mouth section A261 is connected to the transition section 262 is a small-diameter end, the end where the bell-mouth section A261 is connected to the diverter hole B22 is a large-diameter end, the end where the bell-mouth section B263 is connected to the transition section 262 is a small-diameter end, and the end where the bell-mouth section B263 is connected to the converging channel is a large-diameter end. Based on the design of the drainage channel 26, the metal material in the diverter hole B22 and the converging channel is partially drained into the drainage channel 26, thereby increasing the material supply of the reinforcing ribs inside the profile, so that the reinforcing ribs can be formed normally, thereby improving the forming quality and forming stability of the profile.

[0047] Preferably, the drainage surface 2112 is a conical surface, and the angle between the generatrix of the conical surface and the center line of the middle mold is 24°. The smaller the angle, the smaller the drainage notch 211, and the larger the angle, the larger the drainage notch 211. When the angle is less than 22°, the drainage material effect is poor, and the inner layer profile inside the profile will have a poor molding effect due to insufficient material supply, and the process requirements cannot be met. When the angle is greater than 25°, the drainage notch 211 is too close to the upper edge of the diversion hole B22 to form a sharp edge, which reduces the structural strength of the middle mold and is prone to collapse during use. When the angle is selected to be 24°, a better balance is reached between the structural strength of the middle mold and the material drainage effect.

[0048] Preferably, the bell mouth section A261 includes an upper inclined surface, side inclined surfaces connected to both sides of the upper inclined surface, and a bottom plane connected to the lower ends of the two side inclined surfaces, and the angle between the upper inclined surface of the bell mouth section A261 and the center line of the middle mold is 30°. When the angle is reduced, the drainage amount is reduced but the drainage is smoother (the resistance of the metal material flowing along the slope is small), and when the angle is expanded, the drainage amount is increased but the drainage resistance is increased (the resistance of the metal material flowing along the slope is large). When the angle is selected to be 30°, the drainage amount and the drainage resistance reach a better balance point, so that the reinforcing ribs inside the profile have a better forming effect and can meet the process requirements.

[0049] The diverter die provided in this embodiment is used to manufacture a buffer energy absorption box, which is an energy absorbing component on the front and rear anti-collision beams of a car and is a typical thin-walled porous profile.

[0050] like Fig. 9 As shown, the buffer energy absorption box includes an inner layer profile split 41, an outer layer profile split 42 and a reinforcing rib 43. The inner layer profile split 41 is arranged inside the outer layer profile split 42, and a center hole is arranged therein. The outer layer profile split 42 includes a conventional thickness area and a thickened area arranged alternately. A plurality of reinforcing ribs 43 are radially annularly distributed on the outside of the inner layer profile split 41, one side of which is fixedly connected to the inner wall of the outer layer profile split 42, and the other side of which is fixedly connected to the outer wall of the inner layer profile split 41. The reinforcing ribs 43 separate the annular area between the inner layer profile split 41 and the outer layer profile split 42 into a plurality of process holes.

[0051] When the wall thickness of the reinforcing rib 43 is 1.5 mm, the length of the molding gap 27 is 2.4-2.6 mm; when the wall thickness of the inner layer profile body 41 is 2.4 mm, the length of the first working zone 141 is 3-4 mm, and the length of the second working zone 242 is 3-4 mm; when the wall thickness of the conventional thickness area of ​​the outer layer profile body 42 is 2.4 mm, the length of the third working zone 245 is 4.5-5.5 mm, and the length of the fourth working zone 321 is 4.5-5.5 mm; when the wall thickness of the thickened area of ​​the outer layer profile body 42 is 3.38 mm, the length of the third working zone 245 is 7.0-7.5 mm, and the length of the fourth working zone 321 is 7.0-7.5 mm. The reinforcing ribs 43 are formed by the forming gap 27 , the outer layer profile part 42 is formed by the fourth working belt 321 and the third working belt 245 , and the inner layer profile part 41 is formed by the first working belt 141 and the second working belt 242 .

[0052] Through simulation experiments, the extrusion molding process of the buffer energy absorption box is simulated, and the material flow rate distribution data of the profile (a specific length) is derived. The maximum flow rate is 213mm / s, the minimum flow rate is 206mm / s, and the difference is only 7mm / s, which can meet the manufacturing process requirements of the buffer energy absorption box.

Claims

1. Special diversion die for thin-walled porous profiles, characterized by: It comprises a lower die, a middle die and an upper die which are stacked and connected in sequence from bottom to top; the lower die is provided with a die hole, the upper die is provided with a die core A, and the middle die is provided with a die core B; the die hole of the lower die is used to shape the outer wall of the profile, and the die core A of the upper die and the die core B of the middle die are used together to shape the inner wall of the profile; The middle mold includes a main body B and a mold core B; a confluence hole A and a plurality of diversion holes B are provided on the main body B, and a diversion bridge B is formed between adjacent diversion holes B. The confluence hole A and the diversion hole B both penetrate the upper and lower end surfaces of the main body B. A plurality of mold cores B are arranged at intervals at the lower end of the main body B and enclose the confluence hole B. The confluence hole B is connected with the confluence hole A to form a confluence channel. The mold core B is provided with a second working belt and a second empty knife belt in sequence from top to bottom on the side facing the confluence channel; the mold core B is provided with a third working belt and a third empty knife belt in sequence from top to bottom on the side facing away from the confluence channel; a drainage channel, a molding gap and an empty knife gap are provided between two adjacent mold cores B from top to bottom, and the two ends of the confluence channel are respectively connected with the diversion hole B and the confluence channel, the two ends of the molding gap are respectively connected with the lower space of the diversion hole B and the confluence channel, and the two ends of the empty knife gap are respectively connected with the lower space of the diversion hole B and the confluence channel; The upper mold includes a main body A, a connecting column and a mold core A; the main body A is provided with a plurality of diverter holes A, and a diverter bridge A is formed between adjacent diverter holes A. The diverter holes A penetrate the upper and lower end surfaces of the main body A, and each diverter hole A is respectively connected to a part of the edge area of ​​the confluence hole A. The upper end of the connecting column is fixedly connected to the lower end surface of the main body A, and the mold core A is fixedly connected to the lower end of the connecting column. The mold core A is sequentially provided with a first working belt and a first empty knife belt from top to bottom; The lower die includes a main body C; the main body C is provided with a welding chamber and a die hole which are connected in sequence from top to bottom; an annular surface is provided at the junction of the welding chamber and the die hole; a plurality of flow-blocking blocks are evenly distributed in an annular shape at the inner edge of the annular surface; the die hole includes a fourth working belt and a fourth empty knife belt which are connected in sequence from top to bottom; an upper port of the welding chamber is connected to an upper end surface of the main body C; and a lower port of the die hole is connected to a lower end surface of the main body C; The mold core A of the upper mold extends into the confluence channel of the middle mold, the first working belt on the mold core A is opposite to the second working belt in the confluence channel, and the first empty knife belt on the mold core A is opposite to the second empty knife belt in the confluence channel; the diversion hole A of the upper mold and the diversion hole B of the middle mold form a one-to-one correspondence up and down, and each diversion hole A of the upper mold is opposite to the edge area of ​​the confluence hole A of the middle mold at the edge area close to the diversion bridge A; the lower mold contains all the mold cores B of the middle mold through the welding chamber and the mold hole, the fourth working belt in the mold hole is opposite to the third working belt on the mold core B, and the fourth empty knife belt in the mold hole is opposite to the third empty knife belt on the mold core B; the welding chamber of the lower mold is located directly below all the diversion holes B of the middle mold; There are multiple drainage notches evenly distributed in a ring shape at the upper edge of the confluence hole A. The drainage notches include a transition surface and a drainage surface that are smoothly connected from top to bottom. The upper edge of the transition surface is smoothly transitionally connected to the upper end surface of the main body B, and the lower edge of the drainage surface is connected to the hole wall surface of the confluence hole A; the drainage notch and the diversion hole A of the upper mold form a one-to-one correspondence up and down, and are used to receive the metal material extruded by the diversion hole A in the area near the diversion bridge A.

2. The special manifold for thin-walled porous profiles as claimed in claim 1, characterized in that: The angle between the drainage surface and the center line of the middle mold is a, and the value range of a is 23-25°.

3. The special diverter die for thin-walled porous profiles as claimed in claim 2, characterized in that: The angle a is 24°.

4. The special diverter die for thin-walled porous profiles as claimed in claim 3, characterized in that: The drainage channel is provided with a bell-mouth section A, a transition section and a bell-mouth section B in sequence from one end connected to the diversion hole B to the end connected to the converging channel. The end of the bell-mouth section A connected to the transition section is a small-diameter end, the end of the bell-mouth section A connected to the diversion hole B is a large-diameter end, the end of the bell-mouth section B connected to the transition section is a small-diameter end, and the end of the bell-mouth section B connected to the converging channel is a large-diameter end.

5. The special diverter die for thin-walled porous profiles as claimed in claim 4, characterized in that: The bell mouth section A includes an upper inclined surface, side inclined surfaces connected to both sides of the upper inclined surface, and a bottom plane connected to the lower ends of the two side inclined surfaces. The angle formed between the upper inclined surface of the bell mouth section A and the center line of the middle mold is β, and the value range of β is 29-31°.

6. The special manifold for thin-walled porous profiles as claimed in claim 5, characterized in that: The angle β is set to 30°.

7. The special splitter die for thin-walled porous profiles according to any one of claims 3 to 6, characterized in that Used to manufacture a buffer energy absorption box, the buffer energy absorption box comprises an inner layer profile split, an outer layer profile split and reinforcing ribs; the inner layer profile split is arranged inside the outer layer profile split, and a central hole is arranged therein; the outer layer profile split comprises a conventional thickness area and a thickened area arranged alternately; a plurality of reinforcing ribs are radially annularly distributed on the outside of the inner layer profile split, one side of which is fixedly connected to the inner wall of the outer layer profile split, and the other side of which is fixedly connected to the outer wall of the inner layer profile split, and a plurality of process holes are separated by the reinforcing ribs from the annular area between the inner layer profile split and the outer layer profile split; When the wall thickness of the reinforcement rib is 1.5mm, the length of the molding gap is 2.4-2.6mm; when the wall thickness of the inner layer profile split is 2.4mm, the length of the first working band is 3-4mm, and the length of the second working band is 3-4mm; when the wall thickness of the conventional thickness zone of the outer layer profile split is 2.4mm, the length of the third working band is 4.5-5.5mm, and the length of the fourth working band is 4.5-5.5mm; when the wall thickness of the thickened zone of the outer layer profile split is 3.38mm; the length of the third working band is 7.0-7.5mm, and the length of the fourth working band is 7.0-7.5mm; the reinforcement rib is molded through the molding gap, the outer layer profile split is molded together by the fourth working band and the third working band, and the inner layer profile split is molded together by the first working band and the second working band.

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