KR102120320B1 - Manufacturing Method of Rectangular Wire Composed of Brass - Google Patents

Abstract

The present invention relates to a manufacturing method of a rectangular brass wire and, more specifically, to a manufacturing method of a rectangular brass wire consisting of components of 61-70.8 wt% of copper (Cu), 29-38.8 wt% of zinc (Zn), 0.1-1.2 wt% of calcium (Ca), 0.01-0.05 wt% of iron (Fe), and 0.1-0.5 wt% of tin (Sn) and having a fluorine film to prevent product cracks and corrosion and improve the mechanical strength and hardness of a rectangular brass wire. The manufacturing method of a rectangular brass wire comprises the following steps of: melting copper (Cu) and inserting alloy elements to manufacture a brass billet; using the manufactured brass billet to manufacture a brass steel bar; using the manufactured brass steel bar to manufacture a rectangular brass wire; performing a surface treatment on the manufactured rectangular brass wire; and winding the surface-treated rectangular brass wire. The rectangular brass wire has a hardness value of 140-150 HV.

Description

Manufacturing Method of Rectangular Wire Composed of Brass}

This invention relates to a method of manufacturing a brass wire, and to be described in more detail, copper (Cu) 61 to 70.8 wt%, zinc (Zn) 29 to 38.8 wt%, calcium (Ca) 0.1 to 1.2 wt%, iron (Fe) ) It is composed of 0.01~0.05% by weight and 0.1~1.5% by weight of tin (Sn), and a fluorine film is formed, which can prevent cracking and corrosion of the product in advance and improve the mechanical strength and hardness of each brass wire. It relates to a method of manufacturing a brass wire.

As the demand for high-voltage, high-power, and large-capacity motors increases, there is a problem in improving the drop ratio for increasing efficiency with a circular wire, which is a general wire, and the necessity of a flat and rectangular wire is high for a higher drop ratio than the circular wire. As it was lost, each line, which has been limited in use for large-capacity generators, is applied to driving motors of electric/hybrid vehicles, including various motors for automobiles that require high efficiency, and driving motors for high-speed rail vehicles that require high heat and high voltage It is steadily used in generators and large-sized generators, etc., and the scope of its application is gradually expanding, so that each line of various sizes needs to be developed.

On the other hand, brass is a metal made by adding zinc to copper. Depending on the amount of zinc, brass is divided into seven types, 67/33, and 65/35. It is used as a socket for a light bulb, a bullet pharmacy, and other spring materials. Used for electrical appliances, etc., because it is a gold-like color, it is also used for interior decoration such as metal fittings, brass ornaments, buttons, and badges.In the case of α brass, it has high malleability, so it is beaten or stretched to process into plates, rods, wires, tubes, etc. Because it is useful, it is widely used as an important material as an industrial material.

In order to provide more desirable properties to such brass, a small amount of lead (Pb), aluminum (Al), iron (Fe), nickel (Ni), etc. is added as an alloy element to satisfy the required properties such as strength, corrosion resistance, and seawater resistance. Although it has been enacted, RoHS (Restriction of Hazardous Substanes) has been enacted, and environmental regulations have become strict, and as the regulation of harmful elements for the human body has been enforced, lead-free copper alloys with improved cutting performance by adding lead (Pb) A study on replacement is required.

Republic of Korea Patent Publication Publication No. 10-2008-0100821

Accordingly, in the present invention, calcium (Ca), not lead (Pb), is added, and 61 to 70.8% by weight of copper (Cu), 29 to 38.8% by weight of zinc (Zn), 0.1 to 1.2% by weight of calcium (Ca), and iron ( Fe) 0.01~0.05% by weight, tin (Sn) 0.1~1.5% by weight of a free-form copper alloy made of a component, and a fluorine film is formed, which prevents cracking and corrosion of the product in advance and mechanical strength of the brass product. And it is an object to provide a method of manufacturing a brass wire that can improve the hardness.

The configuration of the method of the present invention as a means for achieving the above object is a step of manufacturing a copper billet (Buille) by dissolving copper (Cu) and charging an alloy element, using the manufactured billet (Billet) It comprises the steps of manufacturing a brass bar, manufacturing a brass wire using the manufactured brass bar, surface treating the prepared brass wire, and winding the surface treated brass wire, The above brass is copper (Cu) 61 ~ 70.8 wt%, zinc (Zn) 29 ~ 38.8 wt%, calcium (Ca) 0.1 ~ 1.2 wt%, iron (Fe) 0.01 ~ 0.05 wt%, tin (Sn) 0.1 ~ It is made of a component of 1.5% by weight, and the hardness of the brass wire completed in the above-described step, it is preferable that it is made of a feature characterized in that 140 ~ 150Hv.

In addition, in the configuration of the method of the present invention, the step of manufacturing the above-mentioned brass billet (Billet), the step of melting a copper ingot (Ingot) at a temperature of 1130 ~ 1270 ℃, the dross of the molten copper molten (Dross ) Removing, charging the alloy element into the copper molten metal from which the dross is removed, injecting the copper molten metal from which the alloy element is charged into the mold, and cooling the mold together, and cooling the brass billet ( Billet) is made from the step of removing the scrap by removing from the mold, the injection temperature of the molten metal in the step of injecting the above-described alloy element into the mold molten copper is preferably a temperature of 1080 ~ 1170 ℃ .

In addition, as a configuration of the method of the present invention, the step of manufacturing a brass bar using the above-mentioned brass billet (Billet), put the completed billet (Billet) in claim 2 into a heating furnace to 650 ~ 750 ℃ It is preferable to include the step of heating, passing the heated brass billet through a rough mill to trim the billet into a rod, and rolling the brass rod through the finishing mill to roll into a brass rod having a target value.

In addition, as a configuration of the method of the present invention, the step of manufacturing a brass wire using the above-mentioned brass bar, the step of heating the brass bar completed in claim 3 above into a heating furnace of 150 ~ 200 ℃, the above Step of multi-pulling the heated brass bar, moving the multi-drawn brass bar to a rolling mill and rolling it with a square wire of 0.15 to 0.2 mm wider and higher than the final square wire specification, and finished with the above-mentioned rolling The step of annealing for 4-5 hours in an electric annealing furnace at 430~470℃, surface treating the annealed brass wire, and putting the above-treated brass wire into each wire and winding it. It is made to include, it is preferable that the diameter after the first draw in the above multiple drawing step is characterized in that it is 82% to 95% of the diameter before the draw.

In addition, in the composition of the method of the present invention, the coating solution of the surface treatment step performed on the brass wire is 67 to 76% by weight of fluorine resin and 10 to 12% by weight of p,p'-oxbisbenzenesulfonyl hydrazide. , Methyl methacrylate 7~10 wt%, Epoxysided Soybean Oil 1~3 wt%, Polymethacrylate 3~5 wt%, Propionate 0.1~2 wt%, Phosphate 0.5~3 wt%, Dty It comprises 2 to 3% by weight of zinc carbamate, 0.01 to 3% by weight of benzotriazole, and the above-described fluororesin is polytetrafluoroethylene (PTFE), chlorotrifluoroethylene (CTFE), vinylidene fluoride resin ( PVDF) is preferably included.

Copper (Cu) 61 to 70.8 wt%, zinc (Zn) 29 to 38.8 wt%, calcium (Ca) 0.1 to 1.2 wt%, iron (Fe) 0.01 to 0.05 wt%, tin (Sn) 0.1 to 1.5 wt% It is made of ingredients and has a fluorine coating, which prevents cracking and corrosion of the product in advance, while improving the mechanical strength and hardness of the brass wire.

1 is an overall flow chart of a method for manufacturing a brass wire according to an embodiment of the present invention.
2 is a flowchart of a method for manufacturing a brass billet according to an embodiment of the present invention.
3 is a flowchart of a method for manufacturing a brass bar according to an embodiment of the present invention.
4 is a flowchart of a method for manufacturing a brass wire according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail that a person skilled in the art to which the present invention pertains can easily implement the present invention. Advantages of the objects, actions, and effects of this invention will become more apparent by the description of preferred embodiments.

For reference, the embodiments disclosed herein are only selected and presented as the most preferred embodiments to assist the skilled person in understanding among the possible examples, and the technical spirit of the present invention is not necessarily limited or limited by the presented embodiments , Various changes, additions, and modifications including equivalents or substitutes are possible without departing from the technical spirit of the present invention.

In addition, the expressions of terms or words used in the specification and claims of the present application are defined on the basis of the principle that the inventor can appropriately define the concept of terms in order to best describe his or her invention. However, it should not be interpreted as being limited to only ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

1 is an overall flow chart of a method for manufacturing a brass wire according to an embodiment of the present invention.

As shown in Figure 1, the overall flow chart of the method of manufacturing a brass wire is a step (S100) of dissolving copper (Cu) and charging an alloy element to manufacture a brass billet (S100), the manufactured brass billet (Billet) Manufacturing a brass bar using (S200), manufacturing a brass wire using the manufactured brass bar (S300), surface-treating the manufactured brass wire (S400), and the surface treatment It comprises a step (S500) of winding the brass wire.

At this time, the above-mentioned brass is copper (Cu) 61 ~ 70.8 wt%, zinc (Zn) 29 ~ 38.8 wt%, calcium (Ca) 0.1 ~ 1.2 wt%, iron (Fe) 0.01 ~ 0.05 wt%, tin (Sn ) It is preferably made of 0.1 to 1.5% by weight of components, and the hardness of each brass wire is characterized by being 140 to 150 Hv.

At this time, it is preferable that the calcium (Ca) is contained in the brass in an amount of 0.1 to 1.2% by weight, and when the calcium (Ca) is added less than 0.1% by weight, the formation of Cu-Ca compound is insufficient, so that the free cutability of nickel silver is not improved. When it is added in excess of 1.2% by weight, the castability becomes unfavorable due to an increase in oxide upon dissolution, and the formation of a low melting point compound such as Ca ₂ Cu may cause cracking during hot working, which is not preferable.

In addition, iron (Fe) is preferably contained in brass in an amount of 0.01 to 0.05% by weight, and if it is less than 0.01% by weight, it does not improve the hardness due to less tissue refinement effect. Brittleness is increased, and corrosion properties can be reduced, which is not preferable.

In addition, it is preferable that tin (Sn) is contained in brass in an amount of 0.1 to 1.5% by weight, and if it is less than 0.1% by weight, it does not have a sufficient effect on improving hot workability, and thus does not affect hardness, and when it exceeds 1.5% by weight, hardness The brittleness due to the synergistic effect is increased, which is undesirable.

2 is a flowchart of a method for manufacturing a brass billet according to an embodiment of the present invention.

As shown in Figure 2, the brass billet, the step of dissolving the copper ingot (Ingot) to a temperature of 1130 ~ 1270 ℃ (S110), removing the dross (Dross) of the molten copper melt (S120) , The step of charging the alloy element to the copper molten metal dross is removed (S130), by injecting the copper molten metal is loaded with the alloy element in the mold to cool together with the mold (S140), the cooled brass billet (Billet) to remove the scrap by removing from the mold (S150).

At this time, the temperature of the step of dissolving the copper ingot (S110) is preferably 1130 to 1270°C, and when the above-mentioned temperature is less than 1130°C, the alloying element including the copper ingot is not sufficiently dissolved, which is undesirable, and exceeds 1270°C. If it does, it is not preferable because hydrogen is excessively charged when the alloy element is charged and stirred, so that the correct brass billet cannot be obtained.

In addition, in the step (S140) of injecting the above-described alloy element-loaded copper molten metal into the mold, the injection temperature of the molten metal is set to a temperature of 1080 to 1170°C, and when the molten metal injection temperature is less than 1080°C, the molten metal is introduced into the mold. It is not preferable that the solidification of the molten metal may be started before it is sufficiently injected, and when it exceeds 1170°C, oxygen introduced into the flow of the molten metal may cause fatal defects in the finished brass billet.

3 is a flowchart of a method for manufacturing a brass bar according to an embodiment of the present invention.

As shown in Figure 3, the brass bar, put a brass billet (Billet) into a heating furnace to heat it to 650 to 750°C (S210), and pass the heated brass billet through a roughing mill to trim the billet into rods. Step (S220), passing through the brass bar of the finishing mill comprises a step (S230) of rolling into a brass bar of a target value.

At this time, the heating temperature of the brass billet in the step (S210) of heating the brass billet is preferably 650~750℃, and if it does not reach 650℃, the loosening of the brass billet is insufficient, causing damage in the rolling mill. It is not preferable because it can be, and when it exceeds 750°C, the crystal grains of the brass billet are coarsened, so the finished bi-angled line does not have sufficient hardness, which is not preferable.

4 is a flowchart of a method for manufacturing a brass wire according to an embodiment of the present invention.

As shown in Figure 4, each of the brass wires is heated by putting the brass bars in a heating furnace of 150 to 200°C (S310), multiple drawing of the heated brass bars (S320), and multiple drawing Moving the brass bar to a rolling mill and rolling with a square wire agent of width and height about 0.15 to 0.2 mm larger than the final square wire specification (S330), and the brass wire completed by the above rolling is 4 to 4 in an electric annealing furnace at 430 to 470°C. Annealing for 5 hours (S340), the surface treatment of the annealed brass wire (S350), and the surface treatment of the brass wire is put in a square wire and is wound (S360). .

At this time, in the multiple drawing step (S320), the diameter after one draw is characterized in that it is 82 to 95% of the diameter before drawing, and when drawn with a diameter of less than 82%, it may cause various defects including damage in the material, and is preferable. If it is not drawn and is drawn to a diameter exceeding 95%, it is not preferable because the desired diameter may not be reached due to the elastic recovery of brass.

In addition, in the step of annealing in the electric annealing furnace (S340), the temperature of the electric annealing furnace is preferably 430 to 470°C, and if it does not reach 430°C, the potential in the brass wire caused by rolling cannot be sufficiently resolved, and finally the brass wire It is not preferable because it may cause brittleness, and if it exceeds 470°C, it is not preferable because the brass wire does not have sufficient hardness due to the coarsening of the grain size.

In addition, the coating solution used in the surface treatment step (S350) is 67 to 76% by weight of fluorine resin, 10 to 12% by weight of p,p'-oxbisbenzenesulfonyl hydrazide, 7 to 10% by weight of methyl methacrylate , 1 to 3% by weight of epoxidide soybean oil, 3 to 5% by weight of polymethacrylate, 0.1 to 2% by weight of propionate, 0.5 to 3% by weight of phosphate, 2 to 3% by weight of zinc dithiocarbamate, It is preferable to include 0.01 to 3% by weight of benzotriazole.

The fluorine resin used at this time is preferably made of polytetrafluoroethylene (PTFE), chlorotrifluoroethylene (CTFE), and vinylidene fluoride resin (PVDF), and the total content of the fluorine resin in the coating solution is It is preferable that it is 67 to 76% by weight, and if the content of the fluorine resin is less than 67% by weight, it is not preferable because sufficient surface hardening is not generated, and when it exceeds 76% by weight, surface hardening is excessive and defects on the surface of each brass wire are prevented. It is not desirable because it can cause.

In addition, it is preferable that the polymethacrylate used at this time is 3 to 5% by weight, and when the content of the polymethacrylate is less than 3% by weight, the viscosity of the coating solution is dilute, so that a sufficient thin film is not produced on the surface of the finished brass wire. If it is more than 5% by weight, the viscosity of the immersion solution becomes thicker, so there is a problem in that it is difficult to produce a uniform thin film on the surface of the cast, which is not preferable.

Claims (5)

Dissolving copper (Cu) and charging an alloy element to produce a brass billet (Billet);
Manufacturing a brass bar using the manufactured brass billet;
Manufacturing a brass wire using the manufactured brass bar;
Surface-treating the manufactured brass wire;
It is made, including; winding the surface-treated brass wire;
The above-mentioned brass billet is copper (Cu) 61 to 70.8 wt%, zinc (Zn) 29 to 38.8 wt%, calcium (Ca) 0.1 to 1.2 wt%, iron (Fe) 0.01 to 0.05 wt%, tin (Sn) 0.1 It consists of ~1.5% by weight of ingredients,
The hardness of the brass wire is 140 ~ 150Hv,
The step of manufacturing the above-mentioned brass billet (Billet),
Dissolving the copper ingot (Ingot) at a temperature of 1130 ~ 1270 ℃;
Removing the dross of the molten copper melt;
Charging an alloy element into the copper molten metal from which the dross is removed;
Injecting the molten copper loaded with the alloying element into a mold and cooling the mold together;
And removing the scrap by separating the cooled brass billet from the mold.
Method for manufacturing a brass wire made of a temperature of 1080 ~ 1170 ℃ the injection temperature of the molten metal in the step of injecting the above-described alloy element charged copper molten metal into the mold. delete According to claim 1,
The step of manufacturing a brass bar using the above-mentioned brass billet (Billet),
Putting the above-mentioned brass billet (Billet) into a heating furnace to heat to 650 ~ 750 ℃;
Passing the heated brass billet through a rough mill to trim the billet into rods;
Method of manufacturing a brass wire comprising;; passing through the brass rod of the finishing mill to roll into a brass rod of the target value. According to claim 3,
The step of manufacturing the brass wire using the above-mentioned brass bar,
Heating the above-mentioned brass bar steel in a heating furnace of 150 to 200°C;
Multidrawing the heated brass bar;
Moving the multi-drawn brass bar to a rolling mill and rolling with a square wire agent having a width and height of about 0.15 to 0.2 mm greater than the final square wire specification;
Annealing the brass wire completed by the rolling in an electric annealing furnace at 430 to 470°C for 4 to 5 hours;
Surface-treating the annealed brass wire;
It is made, including; the step of winding the brass wire with the surface treatment of each of the box;
In the above multiple drawing step, the diameter after the one-time drawing is 82% to 95% of the diameter before drawing. According to claim 1,
The coating solution in the step of surface treatment performed on the brass wires described above is
Fluorine resin 67~76% by weight, p,p'-oxbisbenzenesulfonylhydrazide 10~12% by weight, methyl methacrylate 7~10% by weight, epoxidide soybean oil 1~3% by weight, poly Methacrylate 3~5 wt%, Propionate 0.1~2 wt%, Phosphate 0.5~3 wt%, Dithiocarbamate Zinc 2~3 wt%, Benzotriazole 0.01~3 wt%
The fluorine resin is polytetrafluoroethylene (PTFE), chlorotrifluoroethylene (CTFE), a method for producing a brass wire, characterized in that it comprises all of vinylidene fluoride resin (PVDF).

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