Aluminum alloy extrusion die

Abstract

The utility model provides an aluminum alloy extrusion die which comprises an upper die and a lower die which are connected with each other, and is characterized in that a plurality of shunting holes are formed in the upper die, a shunting bridge is connected between every two adjacent shunting holes, a die core is arranged on one side of the upper die, a die hole is formed in the lower die, and the die core penetrates through the die hole. The edge of the die core is provided with a curved surface transitioning towards the flow dividing holes, the lower die is provided with a welding chamber communicated with the flow dividing holes, a distribution groove is formed between the welding chamber and the die hole, and the flow dividing holes are all communicated with the distribution groove. According to the aluminum alloy extrusion die, the proportion of the area, facing the auxiliary hole, of the distribution groove to the cross section area of the auxiliary hole is the same as the proportion of the area, facing the main hole, of the distribution groove to the cross section area of the main hole, so that when an aluminum material is fused and extruded in the distribution groove, the pressure of the aluminum material on the lower die is relatively balanced; fusion and extrusion forming effects of aluminum materials are good, stress concentration of the lower die during extrusion operation is avoided, and the service life of the die is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to extrusion die technical field, concretely relates to a kind of aluminium alloy extrusion dies. BACKGROUND

[0002] As a key process in high-end manufacturing field, aluminum alloy profile extrusion forming technology is widely used in aerospace, rail transportation and new energy vehicle industries, and aluminum extrusion forming die is an important process equipment in aluminum processing industry, which has the characteristics of high precision, high efficiency and high stability, and is a key link in aluminum extrusion forming process, and the core is to control the plastic flow of high-temperature aluminum material through the die to form a complex cross-sectional shape. The traditional split-flow die adopts the structure of combining multiple split-flow holes with guide and welding chamber to realize the production of high-thin-wall and different cross-section profiles.

[0003] However, the existing aluminum extrusion forming die is not balanced in matching between the split-flow hole and the welding chamber, which causes stress concentration during extrusion operation, and the rate difference of metal flowing through each channel is too large, resulting in quality defects such as material shortage and shrinkage mark of aluminum profile. The present application solves the above technical problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an aluminum alloy extrusion die, which is characterized in that the area of the distribution groove facing the auxiliary hole occupies the same proportion of the cross-sectional area of the auxiliary hole as the area of the distribution groove facing the main hole, so that the pressure of the aluminum material on the lower die is more balanced when the aluminum material is fused and extruded in the distribution groove, the fusion and extrusion forming effect of the aluminum material is good, and the stress concentration of the lower die during extrusion operation is avoided, thereby improving the service life of the die.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: an aluminum alloy extrusion die, comprising an upper die and a lower die connected to each other, characterized in that a plurality of split-flow holes are provided on the upper die, and a split-flow bridge is connected between two adjacent split-flow holes, one side of the upper die is provided with a die core, the lower die is provided with a die hole, the die core is arranged through the die hole, the edge of the die core is provided with a curved surface transitioning to the split-flow hole, the lower die is provided with a welding chamber communicating with the split-flow hole, a distribution groove is arranged between the welding chamber and the die hole, and a plurality of split-flow holes are in communication with the distribution groove.

[0006] A back hole is arranged through the die core, the other side of the die core is provided with a discharge hole communicating with the back hole, the discharge hole is in communication with the distribution groove, and the back hole comprises a small cross-section end communicating with the discharge hole and a large cross-section end arranged on one side of the upper die.

[0007] The large-section end edge, the large-section end and the small-section end are provided with a round corner, and the discharging hole is communicated with the small-section end.

[0008] The distribution groove is communicated with the main hole and the auxiliary hole, and the proportion of the area of the distribution groove facing the auxiliary hole to the cross-sectional area of the auxiliary hole is the same as the proportion of the area of the distribution groove facing the main hole to the cross-sectional area of the main hole.

[0009] The main hole and the auxiliary hole are provided with a connection surface expanding from the center to the edge.

[0010] The diameter of the discharging end of the die hole is larger than that of the feeding end.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] (1) the proportion of the area of the distribution groove facing the auxiliary hole to the cross-sectional area of the auxiliary hole is the same as the proportion of the area of the distribution groove facing the main hole to the cross-sectional area of the main hole, so that the pressure of the aluminum material on the lower die is balanced when the aluminum material is fused and extruded in the distribution groove, the fusion and extrusion forming effect of the aluminum material is good, the stress concentration of the lower die during extrusion operation is avoided, and the service life of the die is improved.

[0013] (2) the back hole comprises a small-section end communicated with the discharging hole and a large-section end arranged on one side of the upper die, the other side of the die core is provided with a discharging hole communicated with the back hole, the discharging hole is communicated with the distribution groove, and when the aluminum material is extruded, the large-section end reduces the crushing pressure of the aluminum bar, so that the aluminum material is more easily introduced into the back hole, the stress concentration of the upper die during extrusion of the aluminum material is avoided, the aluminum material is extruded and fused through the small-section end, the flow control of the aluminum material is more accurate, and the forming quality of the profile is improved.

[0014] (3) the large-section end edge, the large-section end and the small-section end are provided with a round corner, and the main hole and the auxiliary hole are provided with a connection surface expanding from the center to the edge, so that the concentrated stress of the aluminum material on the upper die is reduced when the aluminum material flows, the wear and maintenance cost of the die is reduced, the flow of the aluminum material is more uniform, and the quality defect of the aluminum profile is reduced.

[0015] (4) the diameter of the discharging end of the die hole is larger than that of the feeding end, the high-pressure impact of the aluminum material is relieved, the risk of blockage of the aluminum alloy profile during discharging is reduced, the adhesion probability of the aluminum material to the surface of the die under high temperature is reduced, and the generation of granular burrs is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole structure disassembly schematic view of the utility model.

[0017] Figure 2 is a top view of the utility model;

[0018] Figure 3 is a top view of the utility model lower mould;

[0019] Figure 4 is the sectional structure schematic diagram of the utility model Figure 1 ;

[0020] Figure 5 is the sectional structure schematic diagram of the utility model Figure 2 .

[0021] Wherein, in the drawing: 1, upper mould;2, lower mould;3, shunt hole;31, main hole;32, auxiliary hole;4, shunt bridge;5, mould core;51, curved surface;52, discharge hole;6, mould hole;7, welding chamber;8, distribution groove;9, back hole;91, small cross section end;92, large cross section end;10, joint surface. DETAILED DESCRIPTION

[0022] In order to be more clearly illustrate the technical features of the scheme, below through specific implementation, the scheme is described.

[0023] Referring to Figures 1-5 , an aluminum alloy extrusion die, comprising the upper mould 1 and lower mould 2 that are connected to each other, it is characterized in that, the upper mould 1 is provided with several shunt holes 3, two adjacent shunt holes 3 are connected with shunt bridge 4, one side of the upper mould 1 is provided with mould core 5, the lower mould 2 is provided with mould hole 6, the mould core 5 is arranged through the mould hole 6, the edge of the mould core 5 is provided with the curved surface 51 that is transitioned to the shunt hole 3, the lower mould 2 is provided with the welding chamber 7 that is communicated with the shunt hole 3, the distribution groove 8 is arranged between the welding chamber 7 and the mould hole 6, several shunt holes 3 are all communicated with the distribution groove 8.

[0024] The back hole 9 is arranged through the mould core 5, the other side of the mould core 5 is provided with the discharge hole 52 that is communicated with the back hole 9, the discharge hole 52 is communicated with the distribution groove 8, the back hole 9 includes the small cross section end 91 that is communicated with the discharge hole 52, the large cross section end 92 that is arranged at one side of the upper mould 1.

[0025] The edge of the large cross section end 92, between the large cross section end 92 and the small cross section end 91, the bottom of the small cross section end 91 are all provided with round corners, the discharge hole 52 is communicated with the small cross section end 91.

[0026] The shunt hole 3 includes the main hole 31 that is communicated with the side of the mould hole 6, the auxiliary hole 32 that is communicated with the corner of the mould hole 6, the area of the distribution groove 8 towards the auxiliary hole 32 accounts for the same proportion of the cross-sectional area of the auxiliary hole 32 as the area of the distribution groove 8 towards the main hole 31 accounts for the cross-sectional area of the main hole 31.

[0027] The main hole 31 and the auxiliary hole 32 are provided with a connection surface 10 which expands from the center to the edge.

[0028] The aperture of the outlet end of the die hole 6 is larger than that of the inlet end.

[0029] The specific working process and principle of the utility model are as follows:

[0030] In use, the extruded aluminum material passes through the main hole 31, the auxiliary hole 32 and the back hole 9, wherein the aluminum material in the main hole 31 enters the welding chamber 7 under the guidance of the curved surface 51 in the die core 5, and enters the die hole 6 along the distribution groove 8 of the lower die 2, and is formed under the extrusion of the gap between the die core 5 and the die hole 6, at the same time, the auxiliary hole 32 enters the welding chamber 7, and the aluminum material discharged from the main hole 31 is fused in the distribution groove 8, and the die hole 6 towards the auxiliary hole 32 is filled and extruded, the aluminum material is gathered through the large cross-section end 92 of the back hole 9, and then enters the small cross-section end 91, and is distributed to the discharge hole 52 at the bottom of the small cross-section end 91, and is fused and extruded with the aluminum material passing through the main hole 31 and the auxiliary hole 32 in the discharge hole 52, so as to realize the extrusion forming of the aluminum material in the whole profile.

[0031] The area of the distribution groove 8 towards the auxiliary hole 32 accounts for the same proportion of the cross-sectional area of the auxiliary hole 32 as the area of the distribution groove 8 towards the main hole 31 accounts for the cross-sectional area of the main hole 31, so that when the aluminum material is fused and extruded in the distribution groove 8, the pressure of the aluminum material on the lower die 2 is balanced, the fusion and extrusion forming effect of the aluminum material is good, and the stress concentration of the lower die 2 during extrusion operation is avoided, and the service life of the die is improved.

[0032] The back hole 9 includes the small cross-section end 91 communicated with the discharge hole 52, and the large cross-section end 92 arranged on one side of the upper die 1, and the other side of the die core 5 is provided with the discharge hole 52 communicated with the back hole 9, and the discharge hole 52 is communicated with the distribution groove 8, when the aluminum material is extruded, the crushing pressure of the aluminum bar is reduced through the large cross-section end 92, so that the aluminum material is more easily entered into the back hole 9, the stress concentration of the upper die 1 during extrusion of the aluminum material is avoided, the aluminum material is extruded and fused through the small cross-section end 91, the flow control of the aluminum material is more accurate, and the forming quality of the profile is improved.

[0033] The edge of the large cross-section end 92, the large cross-section end 92 and the small cross-section end 91, and the bottom of the small cross-section end 91 are all provided with a round corner, and the main hole 31 and the auxiliary hole 32 are both provided with a connection surface 10 which expands from the center to the edge, so as to reduce the concentrated stress of the aluminum material on the upper die 1 when flowing, reduce the die wear and maintenance cost, the flow of the aluminum material is more uniform, and the quality defect of the aluminum profile is reduced.

[0034] The aperture of the outlet end of the die hole 6 is larger than that of the inlet end, which relieves the high pressure impact of the aluminum material, reduces the risk of blockage when the aluminum alloy profile is discharged, reduces the adhesion probability of the aluminum material to the surface of the die at high temperature, and thus reduces the generation of granular burrs.

[0035] Although the prior art is improved by adding a flow cone, optimizing the depth of the welding chamber 7, etc., but still cannot systematically coordinate the contradiction between metal flow, pressure distribution and structural strength. The extrusion die with multi-stage flow regulation, stress dissipation and welding strengthening designed by the scheme can realize high uniformity material flow and stable forming, and meet the high efficient and precise manufacturing requirements of complex aluminum alloy profiles. It also solves the following problems: the unreasonable layout of the shunt hole 3 leads to too large rate difference of metal flowing through each channel, the lack of material and shrinkage mark is caused by filling lag at the corner of the profile; the volume of the welding chamber 7 and the shunt ratio are not matched, the laminar metal cannot be fully diffused and combined at the intersection interface, visible welding lines are formed, and the mechanical properties of the product are reduced; the stress concentration effect is caused by the right angle design of the root of the die core 5, the fatigue crack propagation rate of the die is accelerated; the extrusion pressure fluctuates sharply, and the bamboo pattern or size out-of-tolerance appears on the surface of the profile.

[0036] The technical features not described in the utility model can be realized by or using the prior art, which will not be repeated here. Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples. Changes, modifications, additions or replacements made by ordinary skilled in the art within the essential scope of the utility model should also be within the protection scope of the utility model.

Claims

1. An aluminium alloy extrusion die comprising an upper die (1) and a lower die (2) connected to each other, characterised in that, The upper die (1) is provided with a plurality of shunt holes (3), two adjacent shunt holes (3) are connected with a shunt bridge (4), one side of the upper die (1) is provided with a mold core (5), the lower die (2) is provided with a mold hole (6), the mold core (5) is arranged through the mold hole (6), the edge of the mold core (5) is provided with a curved surface (51) which is transitioned to the shunt hole (3), the lower die (2) is provided with a welding chamber (7) which is communicated with the shunt hole (3), the welding chamber (7) and the mold hole (6) are provided with a distribution groove (8), a plurality of shunt holes (3) are communicated with the distribution groove (8).

2. The aluminum alloy extrusion die of claim 1, wherein, The mold core (5) is provided with a back hole (9) which is arranged through, the other side of the mold core (5) is provided with a discharge hole (52) which is communicated with the back hole (9), the discharge hole (52) is communicated with the distribution groove (8), the back hole (9) includes a small cross-section end (91) which is communicated with the discharge hole (52), a large cross-section end (92) which is arranged on one side of the upper die (1).

3. The aluminum alloy extrusion die of claim 2, wherein, The edge of the large cross-section end (92), between the large cross-section end (92) and the small cross-section end (91), and the bottom of the small cross-section end (91) are all provided with a round corner, the discharge hole (52) is communicated with the small cross-section end (91).

4. The aluminum alloy extrusion die of claim 3, wherein, The shunt hole (3) includes a main hole (31) which is communicated with the side of the mold hole (6), and an auxiliary hole (32) which is communicated with the corner of the mold hole (6), the area of the distribution groove (8) which is directed to the auxiliary hole (32) accounts for the same proportion of the cross-sectional area of the auxiliary hole (32) as the area of the distribution groove (8) which is directed to the main hole (31) accounts for the cross-sectional area of the main hole (31).

5. The aluminum alloy extrusion die of claim 4, wherein, The main hole (31) and the auxiliary hole (32) are both provided with a connection surface (10) which is enlarged from the center to the edge.

6. The aluminum alloy extrusion die of claim 5, wherein, The hole diameter of the discharge end of the mold hole (6) is larger than that of the feeding end.

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