Special-shaped metal continuous extrusion die

Abstract

The utility model discloses a special-shaped metal continuous extrusion die which comprises a feeding port, a feeding buffer cavity, a forming buffer cavity and a forming outlet which are all communicated in sequence, the forming outlet is arranged to be a polygonal die hole, and the sectional area of the end, close to the forming outlet, of the feeding buffer cavity is smaller than that of the end, away from the forming outlet, of the feeding buffer cavity. By means of the arrangement, after the extruded trapezoid strip is compounded, rolling burrs extending in the longitudinal direction and edge flashes perpendicular to the section of the strip cannot be generated; after the extruded trapezoidal strip is compounded, the edge of the strip has no flash or burr, so that the manual polishing or grinding removal procedure can be cancelled, the labor cost is reduced, the machining procedure of the composite strip is reduced, and the production efficiency is improved; after the extruded trapezoidal strip is compounded, the edge of the strip is free of flashes and burrs, the situation that the surface of the material is damaged in the subsequent machining process due to burr residues is avoided, and therefore the overall yield of products is increased.

Description

Technical Field

[0001] This application relates to the field of electro - contact metal materials, and particularly to a special - shaped metal continuous extrusion die. Background Art

[0002] Precision special - shaped contact strips are applicable to various low - voltage electrical appliances such as micro - switches, circuit breakers, and relays, and are composed of two or more metal materials compounded together.

[0003] In the prior art, the typical preparation method for special - shaped contact strips is the rolling - compounding process; its technological process is to extrude the materials required for the finished product into square wires → flatten the square wires → surface treatment of the materials → high - frequency heating and rolling compounding. The advantage of this compounding method is that a compound strip with a geometric shape of a special cross - section can be obtained after compound rolling. The defect is that rolling burrs extending longitudinally and edge flash perpendicular to the cross - section of the strip will be generated. Subsequent burr treatment needs to be removed by manual grinding or grinding. This method of deburring not only has low efficiency and a large workload, but also burrs are likely to remain, resulting in damage to the material surface during subsequent processing.

[0004] In addition, if the extrusion die method is used, in the prior art, traditional precious - metal extrusion dies mostly adopt circular or square cross - section designs, which limits the application of precious metals in products with complex shapes.

[0005] Therefore, in summary, with the increasing demand for precious - metal special - shaped cross - sections in industrial products, there is room for improvement. Summary of the Invention

[0006] In view of the above problems, this application proposes a special - shaped metal continuous extrusion die. By setting a feeding buffer cavity with a certain inclination and a forming outlet with a special trapezoidal cross - section, on the one hand, the problem of more burrs in the rolling process is solved, and on the other hand, the disadvantage of the single cross - section shape of traditional precious - metal extrusion dies is improved. Finally, the cross - section of the extruded strip presents a specific cross - section similar to that of the strip finished product. The special - shaped metal continuous extrusion die is specifically realized through the following technical solutions:

[0007] A special - shaped metal continuous extrusion die, comprising: a die core. The die core is provided with a feeding port, a forming outlet, a feeding buffer cavity, and a forming buffer cavity along the central axis direction. The feeding port, the feeding buffer cavity, the forming buffer cavity, and the forming outlet are all connected in sequence. The forming outlet is set as a polygonal die hole. The cross - section area of the feeding buffer cavity near the forming - outlet end is smaller than that of the end far from the forming - outlet end, so that the inner walls around the feeding buffer cavity are all inclined.

[0008] Further set, the die core is set as a cylinder, the thickness of the die core is set to 15 - 30 mm, and the diameter of the die core is set to Φ20 - Φ40 mm.

[0009] It is further arranged that the feed port has a rectangular cross section, the length of the rectangular cross section is set to 2-20 mm, and the width is set to 2-20 mm.

[0010] It is further arranged that the forming outlet is arranged to be a trapezoidal cross section, the upper bottom length of the trapezoidal cross section is arranged to be 1 to 10 mm, the lower bottom length is arranged to be 2 to 20 mm, and the height is arranged to be 2 to 8 mm.

[0011] It is further provided that the four vertex corners of the rectangular cross section of the feed port and the four vertex corners of the trapezoidal cross section of the forming outlet are all rounded, and the radius of the rounded corners is set to R0.5-R3.

[0012] It is further provided that the forming outlet is provided with a rounded corner, and the rounded corner radius is set to R0.5-R1.

[0013] It is further provided that the feeding buffer chamber is naturally and smoothly connected with the forming buffer chamber, and the left and right side walls and the upper and lower side walls of the feeding buffer chamber along the trapezoidal cross section are all inclined.

[0014] It is further provided that the slope angle α of the feed buffer cavity along the left and right sides of the trapezoidal cross section is set to 92-102°.

[0015] It is further provided that the slope angle β of the side walls of the feed buffer chamber along the upper and lower sides of the trapezoidal cross section is set to 92-102°.

[0016] It is further provided that the axial depth of the feeding buffer cavity is set to 10-20 mm, and the axial depth of the molding buffer cavity is set to 2-4 mm.

[0017] In summary, the special-shaped metal continuous extrusion die will not produce longitudinally extending rolling burrs and edge flash perpendicular to the strip cross section after the extruded trapezoidal strip is compounded; the extruded trapezoidal strip has no burrs on the edges of the strip after compounding, which can eliminate the manual grinding or grinding removal process, reduce labor costs, and reduce the processing steps of the composite strip to improve production efficiency; the extruded trapezoidal strip has no burrs on the edges of the strip after compounding, which avoids burr residue and causes damage to the material surface during subsequent processing, thereby improving the overall yield of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1The front view of the special-shaped metal continuous extrusion die provided by the embodiment of the present application;

[0020] Figure 2 The left view of the special-shaped metal continuous extrusion die provided by the embodiment of the present application;

[0021] Figure 3 The top view of the special-shaped metal continuous extrusion die provided by the embodiment of the present application;

[0022] Figure 4 The front view of the extrusion die of Embodiment 1 of the present utility model;

[0023] Figure 5 The left view of the extrusion die of Embodiment 1 of the present utility model;

[0024] Figure 6 The top view of the extrusion die of Embodiment 1 of the present utility model;

[0025] Figure 7 The front view of the extrusion die of Embodiment 2 of the present utility model;

[0026] Figure 8 The left view of the extrusion die of Embodiment 2 of the present utility model;

[0027] Figure 9 The top view of the extrusion die of Embodiment 2 of the present utility model;

[0028] Figure 10 The front view of the extrusion die of Comparative Example 1 of the common square die;

[0029] Figure 11 The left view of the extrusion die of Comparative Example 1 of the common square die;

[0030] Figure 12 The top view of the extrusion die of Comparative Example 1 of the common square die.

[0031] Among them, the reference numerals in the figure:

[0032] 1, die core; 2, feed inlet; 3, forming outlet; 4, feed buffer cavity; 5, forming buffer cavity; 6, polygonal die hole; 7, rectangular cross-section; 8, trapezoidal cross-section; 9, slope angle α; 10, slope angle β. Detailed implementation manners

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] The appearance of the above-mentioned terms at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0035] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0036] Please refer to Figures 1 to 3 , a special-shaped metal continuous extrusion die, comprising: a die core 1, the die core 1 is provided with a feed inlet 2, a forming outlet 3, a feed buffer cavity 4 and a forming buffer cavity 5 extending along the central axis direction, the feed inlet 2, the feed buffer cavity 4, the forming buffer cavity 5 and the forming outlet 3 are all connected in sequence, the forming outlet 3 is set as a polygonal die hole 6, and the cross-sectional area of the feed buffer cavity 4 at one end close to the forming outlet 3 is smaller than that at one end far from the forming outlet 3, so that the inner walls around the feed buffer cavity 4 are all inclined.

[0037] Please refer to Figures 4 to 6 , in Embodiment 1, a trapezoidal strip die with a specification of Lx15x6 and AgNi30 prepared for the present utility model, comprising a die core 1, the die core 1 is provided with a feed inlet 2, a forming outlet 3, a feed buffer cavity 4 and a forming buffer cavity 5 extending along the central axis direction, the feed inlet 2, the feed buffer cavity 4, the forming buffer cavity 5 and the forming outlet 3 are all connected in sequence, the forming outlet 3 is set as a polygonal die hole 6, and the cross-sectional area of the feed buffer cavity 4 at one end close to the forming outlet 3 is smaller than that at one end far from the forming outlet 3, so that the inner walls around the feed buffer cavity 4 are all inclined, the die core 1 is set as a cylinder, the thickness of the die core 1 is set as 20 mm, and the diameter of the die core 1 is set as Φ40 mm; the feed inlet 2 is a rectangular cross-section 7, the length of the rectangular cross-section 7 is set as 18 mm, and the width is set as 9 mm; the forming outlet 3 is a special trapezoidal cross-section 8, the upper base length of the trapezoidal cross-section 8 is set as 6 mm, the lower base length is set as 15 mm, and the height is set as 6 mm; the forming outlet 3 is provided with a fillet, and the fillet is set as R0.5; the four top corners of the rectangular cross-section 7 of the feed inlet 2 and the trapezoidal cross-section 8 of the forming outlet 3 are all chamfered, and the sum of the fillets set for the rectangular cross-section 7 and the trapezoidal cross-section 8 is R1.5; the feed buffer cavity 4 and the forming buffer cavity 5 are naturally and smoothly connected, and the feed buffer cavity 4 is inclined along the left and right sides and the upper and lower sides of the trapezoidal cross-section 8; the slope angle α9 of the feed buffer cavity 4 along the left and right sides of the trapezoidal cross-section 8 is set as 95°; the slope angle β10 of the feed buffer cavity 4 along the upper and lower side walls of the trapezoidal cross-section 8 is set as 95°; the axial depth of the feed buffer cavity 4 is set as 17.5 mm, and the axial depth of the forming buffer cavity 5 is set as 2.5 mm.

[0038] Please refer to Figures 7 to 9 In Embodiment 2 of the present utility model, a trapezoidal strip die of AgNi30 with a specification of Lx10x5 is prepared. The die core 1 is provided with a feed inlet 2, a forming outlet 3, a feed buffer cavity 4 and a forming buffer cavity 5 extending along the central axis direction. The feed inlet 2, the feed buffer cavity 4, the forming buffer cavity 5 and the forming outlet 3 are all connected in sequence. The forming outlet 3 is set as a polygonal die hole 6. The cross-sectional area of the feed buffer cavity 4 near the forming outlet 3 is smaller than that at the end far from the forming outlet 3, so that the inner walls around the feed buffer cavity 4 are all inclined. The die core 1 is set as a cylinder, the thickness of the die core 1 is set as 20 mm, and the diameter of the die core 1 is set as Φ40 mm; the feed inlet 2 is a rectangular cross-section 7, the length of the rectangular cross-section 7 is set as 13 mm, and the width is set as 8.5 mm; the forming outlet 3 is a special trapezoidal cross-section 8. The upper base length of the trapezoidal cross-section 8 is set as 4 mm, the lower base length is set as 10 mm, and the height is set as 5 mm; the forming outlet 3 is provided with rounded corners, and the rounded corners are set as R0.5; the four top corners of the rectangular cross-section 7 of the feed inlet 2 and the trapezoidal cross-section 8 of the forming outlet 3 are all chamfered, and the sum of the rounded corners set for the rectangular cross-section 7 and the trapezoidal cross-section 8 is R1.0; the feed buffer cavity 4 and the forming buffer cavity 5 are naturally and smoothly connected, and the feed buffer cavity 4 is inclined along the left and right sides and the upper and lower sides of the trapezoidal cross-section 8; the slope angle α9 of the feed buffer cavity 4 along the left and right sides of the trapezoidal cross-section 8 is set as 95°; the slope angle β10 of the side walls of the feed buffer cavity 4 along the upper and lower sides of the trapezoidal cross-section 8 is set as 95°; the axial depth of the feed buffer cavity 4 is set as 17.5 mm, and the axial depth of the forming buffer cavity 5 is set as 2.5 mm.

[0039] Please refer to Figures 9 to 12 In Comparative Example 1, a conventional square extrusion die for extruding a strip of AgNi30 with a specification of Lx15x6 is used. The extrusion die core 1 is a cylinder. It is characterized in that the thickness of the die core 1 is set as 20 mm, and the diameter of the die core 1 is set as The feed inlet 2 is a rectangular cross-section 7, the length of the rectangular cross-section 7 is set as 18 mm, and the width is set as 9 mm; the forming outlet 3 is a rectangular cross-section 7. The set length of the rectangular cross-section 7 is set as 15 mm, and the width is set as 6 mm; the forming outlet 3 is provided with rounded corners, and the rounded corners are R0.5; the four top corners of the rectangular cross-section 7 of the feed inlet 2 and the forming outlet 3 are chamfered, and the rounded corners set for the rectangular cross-section 7 are all R1.0; specifically, the feed buffer cavity 4 and the forming buffer cavity 5 are naturally and smoothly connected, and the feed buffer cavity 4 is inclined along the left and right sides and the upper and lower sides of the forming hole cross-section. The axial depth of the feed buffer cavity 4 is set as 17 mm, and the axial depth of the forming buffer cavity 5 is set as 3 mm;

[0040] The composite strip obtained by high-frequency rolling and compounding the strip prepared by the square die with BAg15CuP has rolling burrs extending longitudinally and edge flash perpendicular to the strip cross-section. Subsequent burr treatment requires manual grinding or grinding to remove. This deburring method not only has low efficiency and heavy workload, but also burrs are likely to remain, resulting in a great impact on the material appearance during subsequent processing.

[0041] In this invention, the density, relative density, hardness and resistivity of the finished AgNi30 composite electrical contact materials prepared in Comparative Example 1 and Comparative Example 1 were tested. Among them, the density was measured by the Archimedes drainage method, the relative density was calculated as ρactual / ρtheoretical, the hardness of the electrical contact material was measured by a Brinell hardness tester, and the resistivity of the material was measured by an eddy current conductivity meter. The test results are shown in Table 1. It can be seen from Table 1 that the AgNi30 composite electrical contact materials prepared from trapezoidal strips and square strips are similar in physical and electrical properties and both meet the product standard requirements. It is determined that changing to trapezoidal strips has no effect on the properties of the finished contact strips.

[0042] Table 1 Density, hardness and resistivity of AgNi30 composite electrical contact materials prepared from trapezoidal and square strips

[0043] <![CDATA[Density / g.cm -3 > Relative density % HV0.2 Resistivity / μΩ.cm Example 1 9.955 99.85％ 107 2.42 Comparative Example 1 9.947 99.77％ 103 2.46

[0044] Table 1 Data comparison between Example 1 and Comparative Example 1

[0045] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A special-shaped metal continuous extrusion die, characterized in that: The mold core (1) comprises a feeding port (2), a molding outlet (3), a feeding buffer cavity (4) and a molding buffer cavity (5) extending along the central axis direction; the feeding port (2), the feeding buffer cavity (4), the molding buffer cavity (5) and the molding outlet (3) are all connected in sequence; the molding outlet (3) is arranged as a polygonal mold hole (6); the cross-sectional area of ​​the feeding buffer cavity (4) at one end close to the molding outlet (3) is smaller than the cross-sectional area at one end away from the molding outlet (3), so that the inner walls of the feeding buffer cavity (4) are arranged in an inclined manner.

2. A special-shaped metal continuous extrusion die according to claim 1, characterized in that The mold core (1) is configured as a cylinder, the thickness of the mold core (1) is configured as 15 to 30 mm, and the diameter of the mold core (1) is configured as Φ20 to Φ40 mm.

3. A special-shaped metal continuous extrusion die according to claim 1, characterized in that The feed port (2) is a rectangular cross section (7), the length of the rectangular cross section (7) is set to 2 to 20 mm, and the width is set to 2 to 20 mm.

4. A special-shaped metal continuous extrusion die according to claim 3, characterized in that The forming outlet (3) is configured as a trapezoidal cross section (8), the upper bottom length of the trapezoidal cross section (8) is configured as 1 to 10 mm, the lower bottom length is configured as 2 to 20 mm, and the height is configured as 2 to 8 mm.

5. A special-shaped metal continuous extrusion die according to claim 4, characterized in that The four vertices of the rectangular cross section (7) of the feed port (2) and the four vertices of the trapezoidal cross section (8) of the forming outlet (3) are all rounded, and the radius of the rounded corners is set to R0.5 to R3.

6. The special-shaped metal continuous extrusion die according to claim 1, characterized in that The molding outlet (3) is provided with a rounded corner, and the radius of the rounded corner is set to R0.5 to R1.

7. The special-shaped metal continuous extrusion die according to claim 1, characterized in that The feeding buffer chamber (4) and the molding buffer chamber (5) are naturally and smoothly connected, and the left and right side walls and the upper and lower side walls of the feeding buffer chamber (4) along the trapezoidal cross-section (8) are inclined.

8. The special-shaped metal continuous extrusion die according to claim 4, characterized in that The slope angle α (9) of the feed buffer chamber (4) along the left and right sides of the trapezoidal cross section (8) is set to 92-102°.

9. The special-shaped metal continuous extrusion die according to claim 4, characterized in that The feed buffer chamber (4) has a side wall slope angle β (10) on both upper and lower sides of the trapezoidal cross section (8) set to 92-102°.

10. The special-shaped metal continuous extrusion die according to claim 1, characterized in that The axial depth of the feeding buffer cavity (4) is set to 10 to 20 mm, and the axial depth of the molding buffer cavity (5) is set to 2 to 4 mm.

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