Module for producing variable cross-section alloy bar

Abstract

The utility model discloses a module for producing variable cross-section alloy bars, which comprises an integrated backward extrusion die, a backward die holder, a die middle pad, a die tail pad and a base, the integrated backward extrusion die is mounted inside the backward die holder from the metal extrusion side, the die middle pad and the die tail pad are sequentially arranged behind the backward die holder, and the die middle pad and the die tail pad are mounted on the base. Clamping grooves are formed in the bottoms of the reverse mold base, the mold middle cushion and the mold tail cushion, the reverse mold base, the mold middle cushion and the mold tail cushion are assembled with the base through bosses in the base, and a sliding groove is formed in the bottom of the base. According to the module for producing the variable-cross-section alloy bar, the integrated backward extrusion die is installed, the taper design is adopted, the length of a deformation area is increased, metal flowing is facilitated, and concentrated deformation is reduced into slow deformation; and meanwhile, the integrated backward extrusion die and the backward die holder are firmly assembled and are not easy to loosen, the bar material is convenient to demould after extrusion is finished, the problem of die clamping is solved, the die is convenient to change, the production efficiency is improved, and the extrusion die is suitable for extrusion of the variable-section alloy bar material with a small front end diameter and a large tail end diameter.

Description

Technical Field

[0001] The utility model relates to the technical field of metal hot extrusion moulding dies, in particular to a mould set for producing alloy bars with variable cross-sections. Background Art

[0002] The die body of the variable-section alloy bar production plays an important role in controlling size and shape, improving production quality, improving production efficiency, adapting to different production processes, promoting automated production, and reducing maintenance costs. The extrusion process has the characteristics of three-way compressive stress, which can improve the organization of the material and is suitable for the production of difficult-to-deform high-temperature alloy bars;

[0003] Reference publication number CN105964859B is a uniform upsetting forming die for a magnesium alloy bar with a large aspect ratio. The punch and die formed by a combination of spatial curved surfaces can significantly reduce the contact area with the magnesium alloy metal bar, improve the stress state and flow direction of the metal at the end of the magnesium alloy metal bar, enhance the uniformity of the metal deformation at the end and the middle of the magnesium alloy metal bar, achieve uniform deformation of the magnesium alloy bar with a large aspect ratio, and improve the material utilization rate. The economic benefits of promoting it in the forging industry are significant. However, the following problems still exist:

[0004] In the actual use of the above device, although the subsequent demolding is facilitated by the ejector pin, the extrusion die used is a flat-cone die with a split structure. The extrusion die is installed from the extrusion direction and fixed by a die support. The metal deformation during the extrusion process is relatively severe. When it is used for the production of variable-section alloy bars with a small front diameter and a large tail diameter, the surface of the billet is easily scratched and cracked. After extrusion, the workpiece is easily stuck in the die, demolding is difficult, and the production rhythm is slow.

[0005] Therefore, we proposed a module for the production of variable-section alloy bars that can solve the above problems well. Utility Model Content

[0006] The utility model aims to provide a die set for producing alloy bars with variable cross-sections, so as to solve the problem in the current market that metal deformation is too severe during extrusion, resulting in cracking of the workpiece and die jamming after extrusion.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a die set for producing alloy bars with variable cross-sections, comprising an integrated reverse extrusion die, a reverse die base, a die center pad, a die tail pad and a base;

[0008] Also includes:

[0009] The integrated reverse extrusion die is installed inside the reverse die base from the alloy extrusion side, and a die center pad and a die tail pad are sequentially arranged behind the reverse die base, and the bottoms of the reverse die base, the die center pad and the die tail pad are all provided with card grooves, which are assembled together with the base through the boss inside the base, and a slide groove is provided at the bottom of the base, and a slideway is provided under the slide groove.

[0010] Preferably, a No. 1 lifting bolt is provided on the upper portion of the reverse die base, a No. 2 lifting bolt is provided on the upper portion of the middle die pad, and a No. 3 lifting bolt is provided on the upper portion of the tail die pad.

[0011] Preferably, a transverse slot is provided at the bottom of the reverse die base, a second slot is provided at the bottom of the middle die pad, and a third slot is provided at the bottom of the tail die pad.

[0012] Preferably, the inner diameter L1 of the reverse die base is 10 mm larger than the inner diameter of the integrated reverse extrusion die, the inner diameter L2 of the die center pad is 20 mm larger than the inner diameter L1 of the reverse die base, and the inner diameter L3 of the die tail pad is 20 mm larger than the inner diameter L2 of the die center pad.

[0013] Preferably, the base is provided with a transverse boss, a longitudinal boss and a slide groove, and the base is installed with a reverse mold base via the transverse boss, and the base is installed with a mold center pad and a mold tail pad via the longitudinal boss.

[0014] Preferably, the value of the cone angle β of the outer contour of the integrated reverse extrusion die is equal to the value of the cone angle β' of the reverse die base inlet, and the value of the cone angle α of the inner contour of the integrated reverse extrusion die is 115°.

[0015] Preferably, the value of the cone angle β' of the reverse die base entrance is 20°, and a transverse groove 22 is provided at the bottom of the reverse die base.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the die set for producing alloy bars with variable cross-sections is easy to demould and replace, the integrated reverse extrusion die and the reverse die base are firmly assembled and not easy to loosen, the bars are easy to demould after extrusion, and the integrated reverse extrusion die can achieve the purpose of easy replacement, and the specific contents are as follows:

[0017] (1) An integrated reverse extrusion die is provided, which is firmly assembled with the reverse die base and is not easy to loosen. After the extrusion is completed, it is convenient for the bar to be demolded, thus solving the problem of die jamming;

[0018] (2) An integrated reverse extrusion die is provided, which makes die change convenient, improves production efficiency, is suitable for the production of variable-section alloy bars with a small front diameter and a large rear section, and improves workpiece quality;

[0019] (3) The integrated reverse extrusion die adopts a taper design, which extends the length of the deformation zone, facilitates the stable flow of metal during the extrusion process, and reduces concentrated deformation to slow deformation;

[0020] (4) Use bolt No. 1, lifting bolt No. 2 and lifting bolt No. 3 to lift the die, so that the reverse die base, the die center pad and the die tail pad can be disassembled and assembled;

[0021] (5) The module body can be lifted up by the transverse boss and the longitudinal boss, thereby reducing the friction between the module body and the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the module body structure of the utility model;

[0023] Figure 2 A schematic diagram and a stereogram of an integrated reverse extrusion die;

[0024] Figure 3 It is a schematic diagram and a stereogram of the reverse mold base;

[0025] Figure 4 It is a schematic diagram of the assembly of an integrated reverse extrusion die;

[0026] Figure 5 is a schematic diagram of the base structure;

[0027] Figure 6 It is a three-dimensional diagram of the working position of the module body of the utility model in the extrusion process;

[0028] Figure 7 It is a cross-sectional view of the working position of the module body of the utility model in the extrusion process;

[0029] Figure 8 It is a schematic diagram of the blank used in the extrusion process of the module body of the utility model.

[0030] In the figure: 111, die body; 222, extrusion cylinder; 333, extrusion rod; 1, integrated reverse extrusion die; 2, reverse die base; 21, bolt No. 1; 22, transverse slot; 3, die center pad; 31, bolt No. 2; 32, slot No. 2; 4, die tail pad; 41, bolt No. 3; 42, slot No. 3; 5, base; 51, transverse boss; 52, longitudinal boss; 53, slide; 6, slideway; 7, lubrication pad; 8, extrusion pad; 9, blank; 10, bar stock. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1:

[0033] The utility model solves the problem that the metal deformation is too severe in the existing extrusion process, resulting in cracking of the workpiece during extrusion and die jamming after the extrusion is completed. The purpose of facilitating demoulding can be achieved through an integrated reverse extrusion die 1. The utility model discloses:

[0034] An integrated reverse extrusion die 1, a reverse die base 2, a die center pad 3, a die tail pad 4 and a base 5. The integrated reverse extrusion die 1 is installed inside the reverse die base 2 from the alloy extrusion side. The die center pad 3 and the die tail pad 4 are arranged in sequence behind the reverse die base 2. The bottoms of the reverse die base 2, the die center pad 3 and the die tail pad 4 are all provided with a card slot, and are assembled with the base 5 through the boss inside the base 5. The bottom of the base 5 has a slide groove 53, and below the slide groove 53 is a slideway 6, so that the die body 111 can be switched between the die replacement station and the workpiece extrusion station. The inlet cone angle β' of the reverse die base 2 is 20°, and a transverse card slot 22 is arranged at the bottom. The cone angle β of the outer contour of the integrated reverse extrusion die 1 is equal to the inlet cone angle β' of the reverse die base 2, which is easy to install; the cone angle α of the inner contour of the integrated reverse extrusion die 1 is 115°, which is the channel for the metal of the blank 9 to flow in;

[0035] refer to Figures 1 to 8 , 90% of the processed blank Figure 8 As shown, the cone angle α' of the head of the blank 9 is 100°, and the diameter d' is equal to the inner diameter of the integrated reverse extrusion die 1. The billet 9 heated to a high temperature is loaded into the extrusion barrel 222, and then the power system of the extruder causes the extrusion rod 333 to push the extrusion pad 8 and the blank 9 to move toward the integrated reverse extrusion die 1. After the billet 9 is close to the lubricating pad 7, the high-pressure system of the extruder is started, and the billet 9 is extruded into the cavity of the integrated reverse extrusion die 1 and becomes a rod 10. When the billet 9 is extruded to a length of 150 mm, the extrusion barrel 222 and the extrusion rod 333 are withdrawn, driving the extrusion pad 8, the rod 10 and the integrated reverse extrusion die 1 to withdraw together, and then the rod 10 with a small front diameter and a large rear diameter is taken out, and this extrusion process is ended. After the extrusion is ended, it is easy to separate the integrated reverse extrusion die 1 and the reverse die base 2, avoiding the problem of too long demolding time. At the same time, the degree of deformation of the billet 9 during metal extrusion is reduced, and the quality of the extruded product is improved;

[0036] Embodiment 2:

[0037] The utility model solves the problem that the existing mold is not easy to disassemble and assemble. The reverse mold base 2, the mold center pad 3 and the mold tail pad 4 can be easily separated by bolt No. 1 21, hanging bolt No. 2 31 and hanging bolt No. 3 41.

[0038] A No. 1 hanging bolt 21 is provided on the upper part of the reverse die base 2, a No. 2 hanging bolt 31 is provided on the upper part of the die center pad 3, and a No. 3 hanging bolt 41 is provided on the upper part of the die tail pad 4; a transverse clamping groove 22 is provided on the bottom of the reverse die base 2, a No. 2 clamping groove 32 is provided on the bottom of the die center pad 3, and a No. 3 clamping groove 42 is provided on the bottom of the die tail pad 4; the inner diameter L1 of the reverse die base 2 is 10 mm larger than the inner diameter of the integrated reverse extrusion die 1, the inner diameter L2 of the die center pad 3 is 20 mm larger than the inner diameter L1 of the reverse die base 2, and the inner diameter L3 of the die tail pad 4 is 20 mm larger than the inner diameter L2 of the die center pad 3;

[0039] refer to Figure 3 and Figure 4 In order to facilitate separation, after disassembly, use a hoisting hoist to hoist bolt No. 1 21, hoisting bolt No. 2 31 and hoisting bolt No. 3 41, so that the reverse die base 2, die center pad 3 and die tail pad 4 can be disassembled and assembled, thereby achieving the purpose of easy disassembly;

[0040] Embodiment three:

[0041] The utility model solves the problem that the existing module body 111 and the base 5 are completely fitted together, which leads to increased friction. The friction can be reduced by using the transverse boss 51 and the longitudinal boss 52.

[0042] The base 5 is provided with a transverse boss 51, a longitudinal boss 52 and a slide groove 53; the reverse die base 2 is mounted on the base 5 via the transverse boss 51; the die center pad 3 and the die tail pad 4 are mounted on the base 5 via the longitudinal boss 52;

[0043] refer to Figure 5 and Figure 6 , and then the module body 111 can be placed on the base 5 , and the module body 111 can be lifted up by the transverse boss 51 and the longitudinal boss 52 , thereby reducing the friction between the module body 111 and the base 5 .

[0044] Working principle: When using this module for producing variable cross-section alloy bars, first refer to Figures 1 to 8 , 90% of the processed blank Figure 8As shown, the cone angle α' of the head of the blank 9 is 100°, and the diameter d' is equal to the inner diameter of the integrated reverse extrusion die 1. When the blank 9 is extruded to a length of 150 mm, the extrusion cylinder 222 and the extrusion rod 333 are withdrawn, driving the extrusion pad 8, the rod 10 and the integrated reverse extrusion die 1 to withdraw together, and then the rod 10 with a small front diameter and a large rear diameter is taken out, and the extrusion process is completed. After the extrusion is completed, it is easy to separate the integrated reverse extrusion die 1 and the reverse die base 2, avoiding the problem of too long demoulding time. At the same time, the degree of deformation of the blank 9 during the metal extrusion process is reduced, and the quality of the extruded product is improved;

[0045] refer to Figure 3 and Figure 4 In order to facilitate separation, after disassembly, use a hoisting hoist to hoist bolt No. 1 21, hoisting bolt No. 2 31 and hoisting bolt No. 3 41, so that the reverse die base 2, die center pad 3 and die tail pad 4 can be disassembled and assembled, thereby achieving the purpose of easy disassembly;

[0046] refer to Figure 5 and Figure 6 , and then the module body 111 can be placed on the base 5 , and the module body 111 can be lifted up by the transverse boss 51 and the longitudinal boss 52 , thereby reducing the friction between the module body 111 and the base 5 .

[0047] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A die set for producing alloy bars with variable cross-sections, comprising a die set body (111), wherein the die set body (111) comprises an integrated reverse extrusion die (1), a reverse die base (2), a die center pad (3), a die tail pad (4) and a base (5); It is characterized in that Also includes: The integrated reverse extrusion die (1) is installed inside the reverse die base (2) from the alloy extrusion side, and a die center pad (3) and a die tail pad (4) are arranged in sequence behind the reverse die base (2), and the bottoms of the reverse die base (2), the die center pad (3) and the die tail pad (4) are all provided with card slots, and are assembled with the base (5) through a boss inside the base (5), and a slide groove (53) is provided at the bottom of the base (5), and a slideway (6) is provided below the slide groove (53).

2. A die set for producing alloy bars with variable cross-sections according to claim 1, characterized in that: The upper part of the reverse die base (2) is provided with a first hanging bolt (21), the upper part of the die center pad (3) is provided with a second hanging bolt (31), and the upper part of the die tail pad (4) is provided with a third hanging bolt (41).

3. A die set for producing alloy bars with variable cross-sections according to claim 2, characterized in that: The bottom of the reverse die base (2) is provided with a transverse slot (22), the bottom of the die center pad (3) is provided with a second slot (32), and the bottom of the die tail pad (4) is provided with a third slot (42).

4. A die set for producing alloy bars with variable cross-sections according to claim 3, characterized in that: The inner diameter L1 of the reverse die base (2) is 10 mm larger than the inner diameter of the integrated reverse extrusion die (1), the inner diameter L2 of the die center pad (3) is 20 mm larger than the inner diameter L1 of the reverse die base (2), and the inner diameter L3 of the die tail pad (4) is 20 mm larger than the inner diameter L2 of the die center pad (3).

5. The die set for producing alloy bars with variable cross-sections according to claim 1, characterized in that: The base (5) is provided with a transverse boss (51), a longitudinal boss (52) and a slide groove (53), and the base (5) is installed with a reverse mold base (2) via the transverse boss (51), and the base (5) is installed with a mold center pad (3) and a mold tail pad (4) via the longitudinal boss (52).

6. The die assembly for producing alloy bars with variable cross-sections according to claim 1, characterized in that: The cone angle β of the outer contour of the integrated reverse extrusion die (1) is equal to the cone angle β' of the inlet of the reverse die base (2), and the cone angle α of the inner contour of the integrated reverse extrusion die (1) is 115°, and the integrated reverse extrusion die (1) is a channel for the metal of the billet (9) to flow in.

7. The die assembly for producing alloy bars with variable cross-sections according to claim 1, characterized in that: The inlet cone angle β' value of the reverse die base (2) is 20°, and a transverse groove (22) is provided at the bottom of the reverse die base (2).

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