阅读说明：本技术 一种高强度铜铬锆接触线的生产装置 (Production device of high-strength copper-chromium-zirconium contact line ) 是由 冯岳军 卞方宏 赵强 谷正行 程胜 于 2021-09-30 设计创作，主要内容包括：本发明涉及一种高强度铜铬锆接触线的生产装置,包括依次设置的放线架、校直机、清洁机、连续挤压机、冷却装置和收线架,所述连续挤压机设有压实轮、挤压轮和挤压成型模具,所述挤压成型模具包括模座,所述模座由内向外依次设有通孔、模具容纳腔和模套容纳腔,所述模具容纳腔内设有模具,所述模套容纳腔内设有模套,模套将模具限位在模具容纳腔内。本发明通过在模座上分别设置模具容纳腔和模套容纳腔,在模座外形(轴向尺寸)不变的情况下,模具前置,挤压通道变短,所需挤压压力变小,挤压电流下降20%,晶粒没有完全破碎,出现晶粒分层现象,内外晶粒度大小完全不一样,生产出来的产品强度和韧性都有提高,完全满足工业化生产要求。(The invention relates to a production device of a high-strength copper-chromium-zirconium contact line, which comprises a pay-off stand, a straightening machine, a cleaning machine, a continuous extruding machine, a cooling device and a take-up stand which are sequentially arranged, wherein the continuous extruding machine is provided with a compaction wheel, an extrusion wheel and an extrusion forming die, the extrusion forming die comprises a die holder, the die holder is sequentially provided with a through hole, a die accommodating cavity and a die sleeve accommodating cavity from inside to outside, a die is arranged in the die accommodating cavity, a die sleeve is arranged in the die sleeve accommodating cavity, and the die is limited in the die accommodating cavity by the die sleeve. According to the invention, the die containing cavity and the die sleeve containing cavity are respectively arranged on the die holder, under the condition that the shape (axial dimension) of the die holder is not changed, the die is arranged in front, the extrusion channel is shortened, the required extrusion pressure is reduced, the extrusion current is reduced by 20%, the crystal grains are not completely crushed, the phenomenon of crystal grain layering occurs, the sizes of the inner and outer crystal grains are completely different, the strength and toughness of the produced product are improved, and the industrial production requirements are completely met.)

1. The utility model provides a apparatus for producing of high strength copper chromium zirconium contact line which characterized in that: including pay off rack (1), straightener (2), cleaner (3), continuous extrusion machine (4), cooling device (5) and take-up stand (6) that set gradually, continuous extrusion machine (4) are equipped with compaction wheel (7), extrusion wheel (8) and extrusion mould (9), extrusion mould (9) are including die holder (9.1), die holder (9.1) is equipped with through-hole (9.1.1) from inside to outside in proper order, the mould holds chamber (9.1.2) and die sleeve holds chamber (9.1.3), the mould holds and is equipped with mould (9.2) in chamber (9.1.2), the die sleeve holds and is equipped with die sleeve (9.3) in chamber (9.1.3), and die sleeve (9.3) are spacing die (9.2) hold chamber (9.1.2) in the mould.

2. The production device of the high-strength copper-chromium-zirconium contact line according to claim 1, characterized in that: be equipped with horn hole (9.2.1) in mould (9.2), the path end and through-hole (9.1.1) intercommunication of horn hole (9.2.1), horn hole (9.2.1) and through-hole (9.1.1) constitute the extrusion passageway.

3. The production device of the high-strength copper-chromium-zirconium contact line according to claim 1, characterized in that: the cooling device (5) is provided with an oxidation pipe, the oxidation pipe is filled with cooling water, the oxidation pipe filled with the cooling water cools the copper-chromium-zirconium-copper rod, and meanwhile, the effect of preventing oxidation is achieved.

4. The production device of the high-strength copper-chromium-zirconium contact line according to claim 1, characterized in that: the extrusion parameters of the continuous extruder (4) are extrusion rotating speed of 5m/min and extrusion current of 310-330A.

5. The production device of the high-strength copper-chromium-zirconium contact line according to claim 1, characterized in that: the extruded copper-chromium-zirconium contact line (11) comprises a coarse grain area (11.1) with the grain size of 0.5mm at the center and a fine grain area (11.2) with the grain size of 0.05mm at the outer layer, wherein the single-side thickness of the fine grain area (11.2) at the outer layer is 1 mm.

Technical Field

The invention relates to the technical field of electrified railways and rail transit contact networks, in particular to a production device of a high-strength copper-chromium-zirconium contact line.

Background

With the rapid development of electrified railways, the requirements on contact network wires are higher and higher. The contact net wire is required to have high conductivity while having high strength. The high strength of the wire can improve the safety and stability of train operation, and the loss of electric energy in the transmission process can be saved due to high conductivity. The copper chromium zirconium contact line produced by the traditional copper chromium zirconium alloy production process (horizontal extrusion, continuous casting and continuous rolling) has uniform grain size, the toughness is poor along with the improvement of the strength, the standard requirement is difficult to meet, even if qualified products can be produced, the performance is in a critical state, and the industrial production cannot be realized.

Disclosure of Invention

The invention aims to overcome the defects and provides a production device of a high-strength copper-chromium-zirconium contact line, wherein a die accommodating cavity and a die sleeve accommodating cavity are respectively arranged on a die holder, the die accommodating cavity is arranged at the inner side of the die sleeve accommodating cavity, under the condition that the shape (axial dimension) of the die holder is not changed, the die is arranged in front, an extrusion channel is shortened, the required extrusion pressure is reduced, the extrusion current is reduced by 20%, crystal grains are not completely crushed, the phenomenon of crystal grain layering occurs, the sizes of the inner and outer crystal grains are completely different, the strength and toughness of the produced product are improved, and the industrial production requirements are completely met.

The purpose of the invention is realized as follows:

a production device of a high-strength copper-chromium-zirconium contact line comprises a pay-off stand, a straightening machine, a cleaning machine, a continuous extruding machine, a cooling device and a take-up stand which are sequentially arranged, wherein the continuous extruding machine is provided with a compaction wheel, an extrusion wheel and an extrusion forming die; the extrusion forming die comprises a die holder, wherein the die holder is sequentially provided with a through hole, a die accommodating cavity and a die sleeve accommodating cavity from inside to outside, the die is arranged in the die accommodating cavity, the die sleeve is arranged in the die accommodating cavity, and the die sleeve limits the die in the die accommodating cavity.

Preferably, a horn hole is formed in the die, a small-diameter end of the horn hole is communicated with the through hole, and the horn hole and the through hole form an extrusion channel.

Preferably, the cooling device is provided with an oxidation pipe, the oxidation pipe is filled with cooling water, and the oxidation pipe filled with the cooling water cools the copper-chromium-zirconium-copper rod and plays a role in preventing oxidation.

Preferably, the extrusion parameters of the continuous extruder are extrusion rotation speed of 5m/min, extrusion current of 310-330A.

Preferably, the extruded copper-chromium-zirconium contact line comprises a coarse grain region with the grain size of 0.5mm at the center and a fine grain region with the grain size of 0.05mm at the outer layer, and the unilateral thickness of the fine grain region at the outer layer is 1 mm.

The invention has the beneficial effects that:

according to the invention, the die containing cavity and the die sleeve containing cavity are respectively arranged on the die holder, and the die containing cavity is arranged at the inner side of the die sleeve containing cavity, so that under the condition that the appearance (axial dimension) of the die holder is not changed, the die is arranged in front, the extrusion channel is shortened, the required extrusion pressure is reduced, the extrusion current is reduced by 20%, the crystal grains are not completely crushed, the crystal grain layering phenomenon occurs, the sizes of the inner and outer crystal grains are completely different, the strength and toughness of the produced product are improved, and the industrial production requirements are completely met.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of an extrusion molding die of an embodiment.

Fig. 3 is a schematic structural view of the die holder.

FIG. 4 is a schematic cross-sectional view of an extruded product according to an embodiment.

FIG. 5 is a photograph of a metallographic analysis of the coarse grained region of the extruded product of the examples.

FIG. 6 is a photograph of a metallographic analysis of fine grained regions of the extruded product of the examples.

Fig. 7 is a schematic structural view of an extrusion molding die of a comparative example.

Wherein: a pay-off rack 1; a straightening machine 2; a cleaning machine 3; a continuous extruder 4; a cooling device 5; a take-up stand 6; a compaction wheel 7; an extrusion wheel 8; an extrusion forming mold 9; 9.1 of a die holder; a through hole 9.1.1; the mould receiving cavity 9.1.2; the die sleeve accommodating cavity 9.1.3; a service hole 9.1.4; 9.2 of a mould; a horn hole 9.2.1; 9.3 of a die sleeve; a material blocking block 9.4; a copper chromium zirconium copper rod 10; a copper chromium zirconium contact line 11; a coarse-grained region 11.1; fine grain region 11.2.

Detailed Description

Example 1:

referring to fig. 1-6, the invention relates to a production device of a high-strength copper-chromium-zirconium contact line, which comprises a pay-off stand 1, a straightening machine 2, a cleaning machine 3, a continuous extruder 4, a cooling device 5 and a take-up stand 6 which are arranged in sequence, wherein the continuous extruder 4 is provided with a compaction wheel 7, an extrusion wheel 8 and an extrusion forming die 9.

The copper chromium zirconium copper rod 10 sequentially passes through a pay-off rack 1, a straightening machine 2 and a cleaning machine 3 and then enters a continuous extrusion machine 4, the copper chromium zirconium copper rod 10 is pressed into an extrusion wheel 8 by a compaction wheel 7, the copper chromium zirconium copper rod 10 is brought into an extrusion forming die 9 by the rotation of the extrusion wheel 8, an extruded copper chromium zirconium contact wire 11 is cooled by a cooling device 5, and a cooled product is wound by a winding rack.

Extrusion mould 9 includes die holder 9.1, die holder 9.1 is equipped with through-hole 9.1.1, mould from inside to outside in proper order and holds chamber 9.1.2 and die sleeve and hold chamber 9.1.3, the mould holds and is equipped with mould 9.2 in the chamber 9.1.2, the die sleeve holds and is equipped with die sleeve 9.3 in the chamber 9.1.3, and die sleeve 9.3 is spacing in die sleeve holds chamber 9.1.2 with mould 9.2.

The inside of the die 9.2 is provided with a horn hole 9.2.1, the small-diameter end of the horn hole 9.2.1 is communicated with the through hole 9.1.1, and the horn hole 9.2.1 and the through hole 9.1.1 form an extrusion channel. By respectively arranging the die accommodating cavity 9.1.2 and the die sleeve accommodating cavity 9.1.3 on the die holder and arranging the die accommodating cavity 9.1.2 at the inner side of the die sleeve accommodating cavity 9.1.3, under the condition that the appearance (axial size) of the die holder 9.1 is not changed, the forward movement of the die is 13-16mm, the layering effect of 15mm crystal grains is good, the extrusion channel is shortened, the required extrusion pressure is reduced, and the extrusion current is reduced by 20%.

A material blocking block 9.4 is arranged below the inner side of the through hole 9.1.1, and a copper chromium zirconium copper rod 10 rotating along with the extrusion wheel 8 enters an extrusion channel of the extrusion forming die 9 after being limited by the material blocking block 9.4.

And a maintenance hole 9.1.4 is formed in the die holder 9.1, and the maintenance hole 9.1.4 corresponds to the material blocking block 9.4. After the service life of the material blocking block 9.4 is over, the material blocking block 9.4 can not be taken out due to the fact that the material blocking block 9.4 deforms slightly, and at the moment, the ejector pin extends into the outside of the maintenance hole 9.1.4 to eject the deformed material blocking block 9.4.

The cooling device 5 is provided with an oxidation pipe, the oxidation pipe is filled with cooling water, and the oxidation pipe filled with the cooling water cools the copper rod because the temperature of the extruded copper rod is very high, and plays a role in preventing oxidation.

The extrusion parameters of the continuous extruder 4 are extrusion rotation speed of 5m/min, extrusion current of 310-330A.

As shown in fig. 4-6, the extruded cu-cr-zr contact line 11 includes a central coarse grain region 11.1 with a grain size of 0.5mm and an outer fine grain region 11.2 with a grain size of 0.05mm, wherein the outer fine grain region 11.2 has a single-sided thickness of 1 mm.

Comparative example 1:

referring to fig. 7, the conventional extrusion forming mold is as shown in fig. 7, a through hole 9.1.1 and a mold sleeve accommodating cavity 9.1.3 are sequentially formed in a mold base 9.1 of the extrusion forming mold 9 from inside to outside, a mold sleeve 9.3 is arranged in the mold sleeve accommodating cavity 9.1.3, a mold is embedded in the mold sleeve 9.3, a horn hole 9.2.1 is formed in the mold 9.2, a small-diameter end of the horn hole 9.2.1 is communicated with the through hole 9.1.1, the horn hole 9.2.1 and the through hole 9.1.1 form an extrusion channel, the mold base is not provided with the mold accommodating cavity separately, and the length of the extrusion channel is the same as that of the embodiment 1.

The results of comparing the examples with the comparative example production data are shown in Table 1.

It can be seen from the test data that the hardness of the product produced in the example is improved by 7HB compared with that produced in the comparative example, and the extrusion current required in the example is reduced by about 80A, so that the energy consumption is saved. If the extrusion temperature is high, the electric conductivity is also higher, which indicates that alloy elements of the copper rod are precipitated in the extrusion process, and the lower the electric conductivity of the extruded copper rod is, the better the solid solubility is, and the better the subsequent processing aging strengthening effect is.

The extruded products of the examples and comparative examples were subjected to drawing tests, the performance parameters of which are shown in Table 2.

As can be seen from tables 1 and 2, the extruded product exhibited the following cold working deformation amount of 60% at a cold working speed of 5m/min, and the hardness was improved by the cold working and the electric conductivity was reduced by about 1.5%.

The cold worked product is heat treated to precipitate elements such as chromium and zirconium from the copper matrix, which results in increased hardness and increased electrical conductivity. The specific data are shown in Table 3.

As can be seen from the data in Table 3, the hardness of the product after aging strengthening is improved to a greater extent due to the good solid solubility effect (low conductivity) of the product produced by the new tool.

And performing secondary cold machining on the aged product, and finally machining the aged product into a finished product, wherein the specific data are shown in Table 4.

Through data comparison, the tensile strength and the repeated bending of the product produced by the original tool are both in a critical state, and the tensile strength and the repeated bending of the product produced by the new tool are both greatly improved, so that the product requirements are met.

The extrusion channel of the comparative example is longer, and the copper-chromium-zirconium high-temperature softening resistance is strong, so that the extrusion current is extremely large and reaches 400A during extrusion, great damage is caused to tooling dies, and the products cannot be produced in batches. By changing the structure of the die cavity, the extrusion deformation area is shortened, so that the current 320A is reduced by 20 percent during extrusion, the extrusion force is reduced, and the product can be produced smoothly.

The produced copper-chromium-zirconium contact line has inconsistent grain sizes inside and outside, and compared with the traditional configuration, the strength and toughness of the deformed type are improved. The strength is mainly realized by an outer fine crystal layer, and the toughness is realized by a large crystal grain which is not crushed in the middle. Through a comparison test, the heterogeneous tensile strength is improved by 50MPa and the repeated bending is improved by 1-2K under the same cold deformation processing condition.

In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.