Continuous drawing and continuous annealing process capable of improving strength of numerical control cutting line

Abstract

The invention relates to the field of copper wire manufacturing, and discloses a numerical control cutting wire which comprises the following preparation raw materials: 65% of copper, 22% of zinc, 9% of phosphorus and 4% of ferrum, and the numerical control cutting wire is prepared by the following preparation steps: S1, putting the copper, the zinc, the phosphorus and the ferrum into a smelting furnace for smelting; s2, molten metal obtained after smelting is put into a continuous casting machine for blank casting, and a brass alloy blank is obtained after blank casting and cooled; s3, the obtained brass alloy blank is stretched through a giant drawing machine, and a brass alloy wire blank is obtained; and S4, the brass alloy wire blank is fed into a chamber furnace to be subjected to softening annealing work, and the annealed brass alloy wire blank is subjected to wire drawing work of heavy drawing and medium drawing. According to the continuous drawing and continuous annealing process capable of improving the strength of the numerical control cutting wire, the requirement of brass alloy wires in the low-speed wire feeding industry for dense wires is met to a great extent, meanwhile, the surface hot galvanizing process is adopted for galvanizing, the overall cutting speed, surface quality and precision are superior to those of brass wires, and the continuous drawing and continuous annealing process is suitable for high-speed and high-precision machining.

Description

Technical Field

[0001] The invention relates to the field of copper wire manufacturing, in particular to a continuous drawing and withdrawing process capable of increasing the strength of a numerically controlled cutting wire. Background Art

[0002] Wire EDM is a form of EDM. Its principle is to use a moving metal electrode wire as a tool electrode, rely on the instantaneous energy generated by pulse discharge between electrodes to melt or even evaporate the workpiece material, and process parts of the required shape by controlling the running trajectory of the electrode wire. It is widely used in defense, medical, chemical, instrumentation industry and other fields.

[0003] With the development of EDM technology, the market has put forward higher requirements for the performance of brass electrode wire, specifically good verticality, fast cutting speed, high cutting surface accuracy, and low price. The traditional horizontal continuous casting extrusion method to produce brass wire billets has limited cold processing plasticity, resulting in low strength, low toughness, poor density and wear resistance of the cut busbar. Galvanized wire is a rapidly developing variety in recent years. Its cutting speed, surface quality and accuracy are better than brass wire. It is suitable for high-speed and high-precision machining. The thickness uniformity of its galvanized layer is an important factor affecting the cutting accuracy and cutting surface finish. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a continuous pulling and retreating process that can increase the strength of the CNC cutting line, has the advantages of higher strength, etc., and solves the problems in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of higher strength, the present invention provides the following technical solution: a CNC cutting wire, comprising the following preparation raw materials: copper-65%, zinc-22%, phosphorus-9%, and iron-4%. By increasing the proportion of zinc in the raw materials, the processed cutting wire can effectively have good toughness. At the same time, since the proportion of copper has not decreased, the toughness is guaranteed while also having a certain strength. The addition of phosphorus and iron can effectively improve the cutting performance of the copper alloy wire.

[0008] Preferably, the method comprises the following preparation steps:

[0009] S1: copper, zinc, phosphorus and iron are placed in a furnace for smelting;

[0010] S2: The molten metal obtained after smelting is put into a continuous casting machine for casting, and a brass alloy body is obtained after casting and cooled;

[0011] S3: The obtained brass alloy blank is stretched by a giant drawing machine to obtain a brass alloy wire blank;

[0012] S4: feeding the brass alloy wire billet into a chamber furnace for softening annealing, and then subjecting the annealed brass alloy wire billet to large drawing and medium drawing;

[0013] S5: After drawing, the brass alloy wire undergoes alkaline electrolysis, and then acid electrolysis is performed;

[0014] S6: After the electrolysis is completed, a degreasing agent is used to degrease the surface of the copper alloy wire;

[0015] S7: After degreasing, the surface is hot-dip galvanized to obtain a finished copper alloy wire.

[0016] Preferably, the casting temperature in step S1 is controlled at around 1500° C., with a fluctuation of no more than 50° C. A higher casting temperature can make the iron molecules more active, and can effectively combine with copper, zinc and phosphorus to further improve the strength.

[0017] Preferably, the softening annealing temperature in step S3 should be controlled between 650°C and 720°C, and the annealing temperature should be maintained for 1 hour when the temperature is raised to 650°C-720°C. A longer annealing temperature can effectively improve the toughness of the overall copper alloy wire.

[0018] Preferably, the large-scale and medium-scale wire drawing work in step S4 is performed using a continuous drawing and continuous withdrawal device.

[0019] Preferably, the electrolyte for alkaline electrolysis in step S5 is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 33%, and the electrolyte in the acid electrolyte is a copper sulfate solution, and the concentration of the copper sulfate solution is controlled at 230 g / L.

[0020] Preferably, the degreasing work in step S6 uses a degreasing agent to degrease the surface of the brass alloy.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a continuous pulling and retreating process that can increase the strength of the CNC cutting line, and has the following beneficial effects:

[0023] This continuous drawing and continuous retreating process, which can increase the strength of CNC cutting wire, can greatly improve the overall strength and toughness through deep processing and excellent ratio of brass alloy wire, and to a great extent meet the demand for dense wire of brass alloy wire in the wire-cutting industry. At the same time, due to the use of surface hot-dip galvanizing process for galvanizing, the overall cutting speed, surface quality and precision are better than brass wire, which is suitable for high-speed and high-precision processing. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] A preferred embodiment of a continuous drawing and retreating process for increasing the strength of a CNC cutting wire provided by the present invention is as follows: a CNC cutting wire, comprising the following raw materials for preparation: copper - 65%, zinc - 22%, phosphorus - 9%, iron - 4%. By increasing the proportion of zinc in the raw materials, the processed cutting wire can effectively have good toughness. At the same time, since the proportion of copper has not decreased, the toughness is guaranteed while also having a certain strength. The addition of phosphorus and iron can effectively improve the cutting performance of the copper alloy wire.

[0027] In this embodiment, the following preparation steps are included:

[0028] S1: copper, zinc, phosphorus and iron are placed in a furnace for smelting;

[0029] S2: The molten metal obtained after smelting is put into a continuous casting machine for casting, and a brass alloy body is obtained after casting and cooled;

[0030] S3: The obtained brass alloy blank is stretched by a giant drawing machine to obtain a brass alloy wire blank;

[0031] S4: feeding the brass alloy wire billet into a chamber furnace for softening annealing, and then subjecting the annealed brass alloy wire billet to large drawing and medium drawing;

[0032] S5: After drawing, the brass alloy wire undergoes alkaline electrolysis, and then acid electrolysis is performed;

[0033] S6: After the electrolysis is completed, a degreasing agent is used to degrease the surface of the copper alloy wire;

[0034] S7: After degreasing, the surface is hot-dip galvanized to obtain a finished copper alloy wire.

[0035] Example 2

[0036] On the basis of Example 1, a preferred embodiment of a continuous pulling and retreating process provided by the present invention that can increase the strength of a CNC cutting line is as follows: the casting temperature in step S1 is controlled at around 1500°C, with a fluctuation of no more than 50°C. A higher casting temperature can make the iron molecules more active, and can effectively combine with copper, zinc and phosphorus to further improve the strength.

[0037] In this embodiment, the softening annealing temperature in step S3 should be controlled between 650°C and 720°C, and the annealing temperature should be maintained for 1 hour when the temperature is raised to 650°C-720°C. A longer annealing temperature can effectively improve the toughness of the overall copper alloy wire.

[0038] Furthermore, the large-scale and medium-scale wire drawing work in step S4 is performed using a continuous drawing and continuous withdrawal device.

[0039] Furthermore, the electrolyte of the alkaline electrolysis in step S5 is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 33%, the electrolyte in the acid electrolyte is a copper sulfate solution, and the concentration of the copper sulfate solution is controlled at 230 g / L. The acid-base electrolysis can effectively improve the purity of the brass alloy wire and precipitate some impurities brought in during processing.

[0040] In addition, the degreasing work in step S6 uses a degreasing agent to degrease the surface of the brass alloy. Using a degreasing agent to clean the surface can effectively remove the electrolyte attached to the surface of the copper alloy wire during the electrolysis process, and can also remove oil stains and impurities on the surface of the wire.

[0041] In summary, the continuous drawing and retreating process that can increase the strength of CNC cutting wires can largely meet the demand for dense brass alloy wires in the wire-cutting industry. At the same time, due to the use of hot-dip galvanizing technology for galvanizing, the overall cutting speed, surface quality and precision are better than brass wires, which is suitable for high-speed and high-precision processing.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CNC cutting line, characterized in that: The preparation method comprises the following raw materials: copper-65%, zinc-22%, phosphorus-9% and iron-4%.

2. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The method comprises the following preparation steps: S1: copper, zinc, phosphorus and iron are placed in a furnace for smelting; S2: The molten metal obtained after smelting is put into a continuous casting machine for casting, and a brass alloy body is obtained after casting and cooled; S3: The obtained brass alloy blank is stretched by a giant drawing machine to obtain a brass alloy wire blank; S4: feeding the brass alloy wire billet into a chamber furnace for softening annealing, and then subjecting the annealed brass alloy wire billet to large drawing and medium drawing; S5: After drawing, the brass alloy wire undergoes alkaline electrolysis, and then acid electrolysis is performed; S6: After the electrolysis is completed, a degreasing agent is used to degrease the surface of the copper alloy wire; S7: After degreasing, the surface is hot-dip galvanized to obtain a finished copper alloy wire.

3. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The casting temperature in step S1 is controlled at about 150°C, with a fluctuation of no more than 50°C.

4. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The softening annealing temperature in step S3 should be controlled between 650°C and 720°C, and the annealing temperature should be maintained for 1 hour when the temperature is raised to 650°C-720°C.

5. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The large and medium wire drawing work in step S4 is performed using a continuous drawing and continuous evacuation device.

6. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The electrolyte for alkaline electrolysis in step S5 is a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 33%. The electrolyte in the acid electrolyte is a copper sulfate solution, and the concentration of the copper sulfate solution is controlled at 230 g / L.

7. The continuous drawing and retreating process for increasing the strength of a CNC cutting line according to claim 1, characterized in that: The degreasing work in step S6 uses a degreasing agent to degrease the surface of the brass alloy.