CN104690381A - Cutting wire for one-way wire traveling of low magnesia and manufacturing method thereof - Google Patents

Abstract

A low-magnesium oxygen unidirectional wire cutting wire and its manufacturing method, core material: copper 75-85%, magnesium 0.0005-0.50%, boron 0.001-0.03%, RE0.0005-0.02%, other elements 0.05-1.0% %, other elements are at least two of titanium, iron, silicon, nickel, manganese, aluminum, tin, phosphorus, unavoidable impurities <0.5wt%, the rest is zinc; surface layer: copper 35-45%, oxygen 0.0005-3.0% , Magnesium 0.0005-0.25%, RE0.005-0.01%, unavoidable impurities less than 0.5%, the rest is zinc. The core material is smelted by upward continuous casting, plastic processing and recrystallization annealing, and the surface layer is heat-treated to form a mother billet; the mother billet is continuously drawn and annealed to form a cutting line. The cutting wire of the present invention can cut materials with a thickness greater than 80 mm, has high straightness, dimensional accuracy, good surface finish and high cutting speed.

Description

Cutting wire for unidirectional wire-feeding with low magnesium oxygen and manufacturing method thereof

technical field

The invention relates to a cutting wire for low-magnesium (magnesium: 0.0005-0.50wt%) oxygen unidirectional wire electric discharge machining (electrodischarge machining) and a manufacturing method thereof.

Background technique

The unidirectional wire electric discharge machining method is a precision machining method developed rapidly in recent years. EDM technology was first invented by former Soviet scholars Lazarenko and his wife in 1943, and then developed rapidly with the improvement of pulse power supply and control system. EDM is a special processing method that uses the electric erosion effect generated by the pulse discharge between the two electrodes immersed in the working fluid to etch away the conductive material. It is also called electric discharge machining or electric erosion machining.

According to the form of the tool electrode and the characteristics of the relative movement between the workpiece and the workpiece, the EDM methods can be divided into five categories: EDM wire cutting; EDM forming; EDM grinding; EDM conjugate rotary machining; Small hole processing, engraving, surface alloying, surface strengthening and other types of processing. The wire electric discharge machining can be divided into: fast wire electric discharge machining, middle wire electric discharge machining, and one-way wire electric discharge machining according to the difference of wire speed. The present invention mainly describes the last wire electric discharge machining cutting processing.

The development of slow wire EDM (called one-way wire EDM in China) is inseparable from the synchronous development of cutting line technology. The design concept of the internationally popular one-way wire EDM machine tool is based on the work of the cutting line. It is designed based on its characteristics, and the breakthrough of cutting wire technology will often lead to the innovation of wire cutting machine design. From the initial use of oxygen-free copper wire cutting to the current cutting wire cutting, the development of unidirectional wire cutting has experienced a long process from low efficiency and low quality to high efficiency, high quality, automation and specialized production. The development of my country's wire-cutting technology is developed on the basis of gradually introducing and absorbing foreign advanced technologies. From the earliest fast-moving wire-cutting and medium-running wire-cutting processing to the unidirectional wire-cutting electric discharge machining that has been widely used now, it has experienced a series of developments. The development process from low to high. As mentioned above, the development of cutting wire technology determines the development direction of cutting technology, how to research and develop cutting wire, here we must first understand the principle of EDM.

During EDM, one pole of the pulse power supply is connected to the tool electrode, and the other pole is connected to the workpiece electrode. ionized water). The tool electrode is controlled by an automatic feed adjustment device to ensure that the tool and the workpiece maintain a small discharge gap (0.01-0.05mm) during normal processing. When the pulse voltage is applied between the two poles, the liquid medium at the nearest point between the poles under the current conditions will be broken down to form a discharge channel. Due to the small cross-sectional area of the channel and the extremely short discharge time, the energy is highly concentrated (10-107W/mm), and the instantaneous high temperature generated in the discharge area is enough to melt or even evaporate the material, resulting in the formation of small electric corrosion pits. After the end of the first pulse discharge, after a short interval, the second pulse strikes the nearest point between the other poles to discharge, so that the cycle continues with high frequency, the tool electrode is continuously fed to the workpiece, and its The walking shape is finally copied on the workpiece to form the required processing shape. At the same time, a small portion of the total energy is also released to the tool electrode, causing tool wear. The worn tool electrode is continuously discharged, and the new tool electrode without loss is continuously supplied, so that there is always a dynamic balance in the shape of the cutting tool electrode, so as to ensure the dimensional accuracy and surface finish of the workpiece.

With the continuous advancement of material processing technology and mechanical processing technology, the cutting wire has experienced the use conversion from ordinary brass cutting wire to coating cutting wire, and even the multi-layer composite cutting wire is now being studied. The research of these coating cutting wires is all based on The principle of electric discharge machining came into being, and the coatings and coating structures of different tissues are suitable for cutting different types of materials.

For mechanical processing, the pursuit of precision is a major issue at present. For production managers, the consideration is how to improve efficiency. For the unidirectional wire discharge machining method, increasing the speed may reduce the machining efficiency. accuracy, while improving the machining accuracy, it will inevitably reduce the processing efficiency. Therefore, the cutting line of the present invention is suitable for cutting materials with a thickness of 80 mm without affecting the processing accuracy. The straightness of the parts is high, the dimensional accuracy and surface finish are good, and the cutting speed is improved.

The following describes the specific technical conditions of cutting wires used at home and abroad:

1. Ordinary brass cutting wire: This cutting wire is a copper-zinc binary alloy. Because of the limitation of the zinc content in brass, its cutting speed is restricted, and as the zinc content in brass increases, its cutting speed There will also be a small improvement, but its lifting speed is limited, because the higher the zinc content, the more difficult the material will be processed. This kind of cutting line is generally used by ordinary domestic users, but if this kind of cutting line is used to cut materials with a thickness of 80 mm, the processing accuracy and surface quality will be limited, and the line is often broken, which increases the number of workers. difficulty.

2. Galvanized cutting wire: the core material is ordinary brass, and the outer layer is coated with zinc. Due to the gasification of zinc during the cutting process, the discharge of this cutting wire will be relatively stable, and the cutting surface will be smoother than ordinary brass wire. . The relatively mature manufacturing countries in the world are mainly distributed in Europe. At present, some domestic manufacturers can produce it, but the common problem in the use of this cutting line is the problem of powder falling, which is also faced by domestic and foreign manufacturers. Because of powder falling, the auxiliary process time during cutting will be prolonged and the processing efficiency will be reduced. At the same time, when this ordinary galvanized cutting wire cuts a material with a thickness of 80 mm, the situation of zinc powder falling is even worse, which greatly improves The labor intensity of the operator.

3. Speed-type coating cutting wire: the core material is ordinary brass, and the coating is copper-zinc alloy, which is thicker than the coating of ordinary galvanized cutting wire. The cutting speed of this kind of coating cutting wire is faster than that of ordinary galvanized cutting wire, which is suitable for high-efficiency processing. Because the core material of this cutting wire is ordinary brass, the tensile strength will be relatively low, and the shape and position during cutting will be relatively low. Tolerances are not easy to guarantee.

4. β-type cutting line: Research has found that the cutting line with uniform small pits (cracks) on the surface will improve the discharge effect of the cutting line, and this kind of cutting line with porous surface structure came into being. The core material of the diffusion annealed cutting wire is oxygen-free copper or brass alloy, and a layer of copper-zinc alloy is coated on the outer layer by diffusion annealing, and the ratio of copper to zinc is close to 1:1. Since the core material is oxygen-free copper or brass Copper alloy, the surface layer is a porous structure formed by diffusion annealing, and the surface structure of the cutting wire material is β-phase, so this cutting wire is usually called β-type cutting wire. As we all know, at room temperature, the zinc content of the β-phase is less than 50 %. The surface metal of this kind of cutting wire is a β-phase structure, and the β-phase is a brittle phase. Therefore, the toughness of this kind of cutting wire is poor. When cutting a material with a thickness of 80 mm, it is often cut or broken.

5. γ-type cutting line: The research found that the cutting line whose surface structure is γ-phase has higher surface cutting accuracy, because the zinc content of γ-phase is about 60%, and this cutting line is usually called γ-type cutting line. This kind of structure has more zinc content in the cutting line, and the interval between electric spark discharges will be relatively small. Microscopically, the pits of electrocorrosion will be smaller. Reflecting on the macroscopically, the cutting smoothness of this wire will be relatively high. On the other hand, because the zinc content in the γ phase is relatively high, and the electrolytic corrosion rate of zinc will be relatively fast, zinc will be consumed rapidly during the cutting process. Similarly, when this cutting wire cuts a material with a thickness of 80 mm, It often fails or disconnects.

6. Composite phase cutting wire: The surface of this cutting wire contains both β phase and γ phase, so it is also called composite phase cutting wire. This cutting wire combines the advantages of β-type cutting wire and γ-type cutting wire to make The cutting speed and cutting precision are improved at the same time. Only a few industrially developed countries in the world can produce this kind of cutting wire at the same time, because the mixture of β phase and γ phase must be produced at the same time, so its manufacturing cost will be relatively high. Now this kind of wire Because of the cost of cutting wire, almost no manufacturers use it.

Contents of the invention

The present invention aims at the above-mentioned deficiencies of the prior art, and provides a low-magnesium-oxygen unidirectional wire-feeding cutting wire suitable for cutting materials with a thickness of 80 mm and without reducing the cutting efficiency and cutting precision. .

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a cutting wire for low-magnesium oxygen one-way wire-running, the cutting wire is composed of a core material and a surface metal layer coated on the outside of the core material, the core The material alloy is composed of: copper 75-85wt%, magnesium 0.0005-0.50wt%, boron 0.0005-0.03wt%, rare earth 0.0005-0.02wt%, other elements 0.05-1.0wt%, the other elements are titanium, iron, At least two of silicon, nickel, manganese, aluminum, tin and phosphorus, the inevitable impurities are less than 0.5wt%, and the rest is zinc; the alloy composition of the surface composite metal layer is: copper 35-45wt%, oxygen 0.0005 -3.0wt%, magnesium 0.0002-0.25wt%, rare earth 0.0005-0.01wt%, and unavoidable impurities less than 0.5%wt, the rest is zinc.

The first preferred scheme of the low-magnesium-oxygen unidirectional wire cutting wire of the present invention, the alloy composition of the core material is: copper 75-80wt%, magnesium 0.0005-0.01wt%, boron 0.0005-0.01wt%, rare earth 0.0005- 0.02wt%, other elements 0.05-0.5wt%, the sum of the content of copper, zinc, magnesium and boron is less than 99.5wt%, wherein the zinc content is greater than 19.5wt%; the alloy composition of the surface composite metal layer is : copper 40-45wt%, oxygen 0.0005-1.0wt%, magnesium 0.0002-0.008wt%, rare earth: 0.0005-0.01wt%, the rest is zinc.

The preferred scheme two of the low-magnesium oxygen unidirectional wire cutting wire of the present invention, the alloy composition of the core material is: copper 80-85wt%, magnesium 0.005-0.50wt%, boron 0.005-0.03wt%, rare earth 0.0005- 0.02wt%, other elements 0.05-0.5wt%, the sum of the content of copper, zinc, magnesium and boron is less than 99.5wt%, wherein the zinc content is greater than 14.5wt%; the alloy composition of the surface composite metal layer is : copper 35-40wt%, oxygen 0.01-3.0wt%, magnesium 0.0005-0.25wt%, rare earth 0.0005-0.01wt%, the rest is zinc.

The thickness of the surface metal layer of the low-magnesium oxygen unidirectional wire cutting wire of the present invention is greater than 5% and less than 23% of the final diameter of the cutting wire.

The total electrical conductivity of the low magnesium oxygen unidirectional wire cutting wire of the present invention is greater than 25.5% IACS to 37.5% IACS.

The present invention also provides a method for manufacturing the above-mentioned low-magnesium-oxygen unidirectional wire cutting wire, specifically: adopting the alloying smelting technology, and continuously drawing various raw materials with formula proportions at a temperature of 980-1250 degrees Celsius Casting technology casts a brass billet rod, and produces a core material through plastic processing and recrystallization annealing processes; the core material is covered with a layer of zinc on the surface by chemical electroplating or mechanical methods to form the original billet (shown in Figure 2). Heat treatment under a neutral atmosphere, the heat treatment pressure is 0.5-12.5 MPa, the oxygen content is 10-90wt%, and the heat treatment temperature is 250-450 degrees Celsius; then 250-450 degrees Celsius for 2.0-16.0 hours, and then cooled to 50 degrees Celsius with the furnace Produce the surface layer metal layer containing copper, zinc, magnesium and oxygen on the surface (shown in Figure 3); carry out continuous annealing processing to the composite material made by the above method, and produce the final unidirectional wire cutting line.

The above-mentioned other elements of the present invention can be added in any ratio, as long as the total content is in the range of 0.05-1.0 wt%.

Advantages and beneficial effects of the present invention:

1. The core material metal of the present invention adopts alloying continuous casting smelting and casting technology, adds a trace amount of boron, the serial number of the periodic table of boron is 5, the radius of the atom is very small, and the serial number of the periodic table of zinc is 5. The atomic radius is 30, and the atomic radius is much larger than that of boron. When cutting, the surface metal layer is first consumed. If the surface metal layer is consumed, the core metal continues to be consumed. At this time, the tensile strength of the cutting line will decrease, and the mechanical properties will deteriorate. Cutting becomes difficult because boron is added, and the atomic radius of boron is small. When the zinc of the core metal is just consumed, the boron atoms quickly occupy the vacancies left by the zinc atoms, which protects the core. The metal will not continue to be lost, which ensures that the performance of the core metal will not be reduced.

2. Because the core material metal of the present invention adopts the alloying up-leading continuous casting smelting and casting technology, a small amount of magnesium element is added. It is well known that magnesium is a metal with extremely active chemical properties, and chemical reactions are very easy to occur at high temperatures . The copper content of the alloy core material of the present invention is relatively high, reaching 75-85wt%, and the temperature reaches 980-1250 degrees Celsius. At the same time, because the zinc content is at most only 24.5wt%, the content is low, which affects the deoxidation effect. The water is easily dissolved in the metal solution, the water vapor is dissolved in the solution, and decomposed into hydrogen atoms and oxygen atoms at high temperature, and the oxygen atoms and copper undergo a chemical reaction to produce copper oxide and cuprous oxide, and hydrogen atoms are easily produced when dissolved in copper solution. Hydrogen embrittlement, if this phenomenon is not eliminated, the mechanical properties of the manufactured core material will decrease. In order to reduce this negative effect, add strong reducing metal magnesium element (the addition method of metal magnesium can be added in the form of copper-magnesium master alloy), magnesium will reach the following four beneficial effects after being dissolved in the copper solution: ( 1) Magnesium reacts with copper oxide and cuprous oxide to produce magnesium oxide, which floats on the surface of the solution and turns into slag. This slag can be removed to effectively remove harmful oxide inclusions; (2) Magnesium element enters After the copper solution, intense combustion occurs to generate combustion heat, the local copper water will roll, and the hydrogen atoms dissolved in the copper water will undergo a polymerization reaction to produce hydrogen vapor, which is the gas with the lowest density in nature. The tumbling of copper water will discharge, reducing the occurrence of hydrogen embrittlement of alloy materials; (3) magnesium element is added according to a certain proportion. Magnesium can be used as a fine-grain strengthening element to improve the mechanical properties of the metal matrix; (4) the remaining magnesium can also improve the stability of the material at high temperatures, thereby improving the high-temperature disconnection resistance of the cutting wire.

3. The present invention improves the overall performance of the cutting wire by adding rare earth elements. Rare earth metals are excellent modifiers and refining purifiers. Rare earth metals are not solid-soluble in copper, and can form a dispersion strengthening phase in copper alloy solution, which can purify the structure and improve the comprehensive performance of the cutting wire. At the same time, the rare earth metal will form a metal compound with a high melting point with the impurity elements in the copper alloy solution, such as: Pb, Sb, Bi, Te, so that the metal solution will dissolve into the metal crystal when the metal solution is cooled, improving the plasticity and durability of the metal. Abrasiveness, so that the metal compound at the grain boundary is finer and more uniformly distributed; on the other hand, the addition of metal rare earth elements can increase the conductivity of the metal material. Generally, the addition content should be less than 0.025wt%, and the excessive content will reduce the alloy. fluidity and increased cost; on the other hand, due to the addition of rare earth metals to the core metal, when the surface metal is heat-treated, a part of the rare earth metal in the core metal component will remain in the surface metal, and will remain in the surface metal The rare earth metal in the layer can improve the high temperature resistance of the surface metal during cutting, so that the ability of the cutting wire to withstand high temperature during cutting is strengthened, thereby reducing the occurrence of burning wire.

4. Because the core metal of the present invention adopts fine-grain strengthening technology, that is, by adding titanium, iron, silicon, nickel, manganese, aluminum, tin, and phosphorus metal elements, it can deoxidize, so that the purity of the core material is higher, and it is also Refine the grains, make the grains smaller and improve the mechanical properties of the material. The improvement of mechanical properties is beneficial to ensure the shape and position tolerance of the material.

5. The present invention is because the copper content of core material metal is 75-85wt%, and zinc content is 14.5-24.5wt%, and the content of titanium, iron, silicon, nickel, manganese, aluminum, tin, phosphorus, rare earth is not more than 1.0wt %, the ratio of this composition, the material cost is low, and the mechanical performance of the material does not decrease, the production difficulty is small, and it is suitable for industrial production.

6. The present invention is because surface layer metal contains 0.0005-3.0wt% oxygen, and these oxygen elements form cupric oxide, cuprous oxide, zincous oxide, zinc oxide with copper and zinc, and these metal compounds have blocked the continuity of surface layer metal copper and zinc , which ensures the interval discharge during cutting, and plays the role of cooling and chip removal during EDM. The principle of chip removal and cooling is that during discharge, because zinc has a low gasification temperature, it is corroded first, while copper oxide, cuprous oxide, zinc oxide, and zinc oxide with high melting points are left on the surface of the cutting line. , to ensure that the shape of the cutting line remains unchanged, and the pits left by the corrosion of zinc increase the surface area of the cutting line. The cutting speed of the cutting line will be improved; because the shape of the cutting line does not change during discharge, that is to say, the shape of the tool electrode does not change, so the shape tolerance of the cut material will be improved compared with other types of lines.

7. In the present invention, because the content of zinc in the surface metal layer is greater than 50wt%, the gasification performance during discharge is enhanced, which helps to improve the surface finish during cutting.

8. The present invention heat-treats the zinc-coated material in an oxidative atmosphere, so that incomplete recrystallization and chemical reactions occur in the material, and the selection of the incomplete recrystallization temperature is based on the copper content of the core material to ensure that the material will not be reduced. Comprehensive mechanical properties, because after the mechanical properties are reduced, the mechanical properties of the final product cannot meet the performance requirements of the cutting line.

9. Because the present invention carries out aerobic heat treatment under an oxidative atmosphere, oxygen atoms can fully enter the surface metal at high temperature, and form copper oxide, cuprous oxide, zinc oxide, and zinc oxide with the body metal, and the surface layer The zinc atoms of the core material and the copper atoms of the core material react electrochemically with each other to produce a copper-zinc-magnesium-oxygen composite layer on the surface. This composite layer contributes to the discharge effect during discharge machining. The metallographic analysis of the composite layer is shown in Figure 4.

10. The magnesium in the surface layer metal among the present invention is formed like this: after the surface layer metal is carried out heat treatment, the magnesium in the core material alloy will have a part to infiltrate in the surface layer metal, the fact proves, this part magnesium has the following function: When discharging, the surface metal is the first to withstand high-temperature electric corrosion. Magnesium can improve the high-temperature resistance of materials at high temperatures. Therefore, magnesium in the surface metal can improve the high-temperature electric corrosion resistance of the surface metal, thereby reducing the number of electrodes during cutting. At the same time, the magnesium in the surface metal also partially generates magnesium oxide, which also has the cooling and chip removal functions in (6) above.

11. The processing of the final product process of the present invention adopts plastic processing and continuous annealing with a large processing rate to ensure the electrical conductivity and mechanical properties of the cutting line. The metallographic analysis diagram of the final product is shown in Figure 5.

12. The thickness of the surface copper-zinc-magnesium-oxygen composite layer of the present invention is greater than 5% of the final diameter and less than 23% of the final diameter. If the thickness of the composite layer is too thin, the improvement of the cutting effect will not be obvious; if the thickness of the composite layer is too thick, the mechanical properties of the material will decrease, making cutting difficult and easy to break.

13. The total conductivity of the low-magnesia unidirectional wire cutting wire of the present invention is greater than 25.5% IACS to 37.5% IACS. Maintain the conductivity when cutting thick workpieces. Such a high conductivity can enhance the ability of the cutting wire to withstand current, help to stabilize the voltage during discharge, and ensure the stability of cutting.

14. The low-magnesium oxygen unidirectional wire cutting wire of the present invention is a cutting wire with improved mechanical properties and enhanced discharge performance, which is helpful for cutting materials with a thickness of 80 mm, and the straightness of the cut materials is high , Dimensional accuracy, good surface finish, and cutting speed can be improved.

Description of drawings

Fig. 1 is the cross-sectional schematic diagram of cutting line 1 of the present invention;

Fig. 2 is the schematic cross-sectional view of the mother blank 2 before heat treatment of the present invention;

Fig. 3 is the schematic cross-sectional view of the mother blank 3 after the heat treatment of the present invention;

Fig. 4 is the metallographic picture of the physical cross-section of the mother blank of the present invention;

Fig. 5 is the physical section metallographic enlarged picture of cutting line 1 of the present invention;

Detailed ways

The present invention is further described in detail below through examples, but the present invention is not limited only to the following examples.

The conductivity unit %IACS described in the present invention is the International System of Units.

μm in the present invention is a unit of measurement, representing microns.

The wt% mentioned in the present invention is the mass percentage when the material is proportioned, not the volume percentage.

The fine-grain strengthening technology in the present invention is carried out through the application of metamorphic treatment. The method of improving the mechanical properties of metal materials by refining grains is called fine-grain strengthening. In industry, the strength of materials is often improved by refining grains .

The mechanism of the fine-grain strengthening technology in the present invention is: usually, metals are polycrystals composed of many grains, and the size of the grains can be expressed by the number of grains per unit volume, the more the number, the finer the grains. Experiments have shown that fine-grained metals have better mechanical properties than coarse-grained metals at room temperature. This is because when the fine-grained metal is plastically deformed by external force, the external force can be decomposed in more grains. At this time, the plastic deformation is more uniform and the stress concentration is smaller; in addition, the finer the grain, the larger the grain boundary area. , the more tortuous the grain boundary is, the more unfavorable it is to the expansion of cracks, so the toughness of the material is improved. Therefore, this kind of material strengthening technology is called fine grain strengthening. After the material is strengthened by fine grain, the comprehensive performance will be improved.

In order to prove that the cutting wire structure and the manufacturing method of the cutting wire of the present invention are advantageous, the following examples are used to demonstrate.

In the present invention, specific smelting, processing, stretching, etc. are all conventional technologies in the industry, for example, reference may be made to existing technologies such as ZL200810163235.7.

Example 1

1. Manufacture the cutting wire A with a cutting wire diameter of 0.25mm according to the present invention. The core material alloy is composed of: copper: 84.0wt%, magnesium: 0.16wt%, boron: 0.012wt%, rare earth: 0.0012wt%, and the content of other elements is 0.5wt%, other elements are iron and phosphorus, the content of unavoidable impurity elements is less than 0.5wt%, and the rest is zinc; the surface metal is: copper: 37.0wt%, oxygen: 0.01-3.0wt%, magnesium: 0.09wt%, rare earth: 0.0006wt%, unavoidable impurity element content is less than 0.5%wt, and the rest is zinc.

Step 1. The raw materials are copper, magnesium and boron purchased in the market. After being selected and processed by the laboratory, after passing the test, the proportioning is carried out according to the requirements of the core material composition (wherein boron can be made into an intermediate alloy and added), and the prepared material is transported to The smelting site is smelted, the smelting temperature is controlled at 1050-1250 degrees Celsius, the traction speed is 1.0-3.5 m/min), and the diameter of the continuous casting rod produced is 6.0-16.0mm.

After surface treatment, the above-mentioned continuous casting slabs are subjected to multi-pass plastic processing and recrystallization annealing (both are conventional processes in the industry, which will not be repeated here) to make brass with a diameter of 1.2mm and a copper content of 84.0wt%. Wire, and then cover the zinc layer with a thickness of 22 μm by chemical method to form the mother blank 2.

Step 2. Heat treatment the material prepared in step 1. The heat treatment atmosphere is as follows: the oxygen content is 45%, the heat treatment temperature is 375°C, and the holding time is 5 hours to form the mother blank 3, which is cooled to 50°C and released from the furnace.

Step 3, using continuous pulling and continuous annealing equipment to carry out high processing rate stretching and stress relief annealing on the mother blank 3 made in step 2 (specifically: the workpiece is under the condition of less than 550 ° C, the annealing speed is 850-1500 m/ Minutes, the annealing distance is 0.5-10 meters, and then in the annealing liquid (the annealing liquid can also be called burning stewing oil, annealing burning stewing oil is a common saying in the industry, and can be bought on the market, such as the multidraw DG produced in Germany. type; there are also many domestic products, such as FX128, etc.) for post-processing, the temperature of the annealing solution is 15-100 degrees), and coiling and winding, the specification of the finished product after stretching is 0.25mm, and the cutting line is measured by the test The tensile strength is 755N/mm ² ;

1. Compare the cutting line A with any common brass cutting line I on the market;

2. The one-way wire cutting machine used in the test is the FA10SADVANCE2009 machine manufactured by Mitsubishi;

3. The test conditions are as follows: the size of the workpiece cut in the test is 84.0*4.5*4.5 (0.5*3 groove); the material of the workpiece: SKD11; the equipment parameters: NM; the number of processing: one repair three; The tension parameter is adjusted to fit a cutting line of 700N/ ^mm2 ; the nozzle is pressed against the workpiece. Record the cutting effects of the two types of cutting wires, as shown in Table 1 below:

Table 1 Implementation 1 Cutting effect of two types of cutting wires

Cutting line category total processing time first knife speed time to first cut Work piece roughness Straightness (μm) Contrast line Ⅰ 38.46 points 1.0-1.5mm/min 22.90 points Ra＝0.808 4 cutting line A 30.52 points 1.3-1.8mm/min 17.90 points Ra＝0.842 3

Note: The straightness in this table is the maximum absolute value difference of the three dimensions above, below and below the height of 85.

4. It can be seen from Table 1 that in the case of a slight decrease in the surface roughness of the workpiece, it has been proved that the decrease in roughness is enough to offset the comprehensive increase in the comprehensive benefits brought to users by the improvement of cutting efficiency. Calculated based on the total cutting time, the total cutting efficiency of the cutting wire prepared in this example is increased by 26.01%, the cutting speed of the first cut is increased by 27.93%, and the straightness is improved, and the cutting efficiency is increased by more than 25%, which has broad market promotion value .

Example 2

Manufacture the cutting wire B whose cutting wire diameter is 0.25mm according to the present invention, characterized by: copper: 81.0wt%, magnesium: 0.008wt%, boron: 0.009wt%, rare earth: 0.0017wt%, the content of other elements is 0.5wt%, Other elements are iron and phosphorus, the content of unavoidable impurity elements is less than 0.5wt%, and the rest is zinc; the surface metals are: copper: 39.0wt%, oxygen: 0.01-3.0wt%, magnesium: 0.004wt%, rare earth : 0.0008wt%, the content of unavoidable impurity elements is less than 0.5%wt, and the rest is zinc.

Step 1. The raw materials are copper, magnesium and boron purchased on the market. After testing and testing, they are selected and processed. After passing the test, the proportioning is carried out according to the requirements of the core material composition (wherein boron can be made into an intermediate alloy and added), and the prepared material is Transport to the smelting site for smelting, the smelting temperature is controlled at 1050-1250 degrees Celsius, the traction speed is 1.0-3.5 m/min), and the specifications of the produced continuous casting rods are 6.0-16.0mm in diameter.

After surface treatment, the above-mentioned continuous casting slabs are subjected to multi-pass plastic processing and recrystallization annealing to produce brass wires with a diameter of 1.05 mm and a copper content of 81.0 wt %, and then use a chemical method to cover a zinc layer with a thickness of 25 μm , forming the mother blank 2.

Step 2. Heat treatment the material prepared in step 1. The heat treatment atmosphere is as follows: the oxygen content is 33%, the heat treatment temperature is 390°C, and the holding time is 12 hours to form the mother blank 3, which is cooled to 50°C and released from the furnace.

Step 3, using continuous pulling and continuous annealing equipment to carry out high processing rate stretching and stress relief annealing on the mother blank 3 made in step 2 (the workpiece is under the condition of less than 550 ° C, the annealing speed is 850-1500 m/min, annealing The distance is 0.5-10 meters, and then in the annealing liquid (annealing liquid can also be called stewing oil, annealing and stewing oil is a common saying in the industry, and it can be bought on the market, such as the type of multidraw DG produced in Germany; There are also many domestic products, such as FX128, etc.) for post-processing, the temperature of the annealing solution is 15-100 degrees), and coiling and winding, the specification of the finished product is 0.25mm after stretching, and the tensile strength of the cutting line is measured by the test. The strength is 785N/mm ² ;

1. Compare cutting line B with any gamma type cutting line II on the market;

2. The one-way wire cutting machine used in the test is the FA10SADVANCE2009 machine manufactured by Mitsubishi;

3. The test conditions are as follows: the size of the workpiece cut in the test is 84.0*4.5*4.5 (0.5*3 groove); the material of the workpiece: SKD11; the equipment parameters: NM; the number of processing: one repair three; The tension parameter is adjusted to fit a cutting line of 700N/ ^mm2 ; the nozzle is pressed against the workpiece. Record the cutting effects of the two types of cutting wires, as shown in Table 2 below:

The cutting effect of two types of cutting wires in embodiment 2 of table 2

Cutting line category total processing time first knife speed time to first cut Work piece roughness Straightness (μm) Contrast line Ⅱ 32.83 points 1.1-1.6mm/min 19.72 points Ra＝0.848 4 cutting line B 30.72 points 1.3-1.8mm/min 17.80 points Ra＝0.838 3

Note: The straightness in this table is the maximum absolute value difference of the three dimensions above, below and below the height of 85.

4. It can be seen from Table 2 that when the surface roughness of the workpiece is basically the same, the cutting efficiency is increased by 6.86% based on the total cutting time, the first cutting speed is increased by 10.79%, and the straightness is improved to a certain extent.

Example 3

1. Manufacture the cutting wire C with a cutting wire diameter of 0.25mm in the present invention, characterized by: copper: 79.0wt%, magnesium: 0.008wt%, boron: 0.008wt%, rare earth: 0.01wt%, and the content of other elements is 0.5wt% %, other elements are iron and phosphorus, the content of unavoidable impurity elements is less than 0.5wt%, and the rest is zinc; the surface metal is: copper: 43.0wt%, oxygen: 0.0005-1.0wt%, magnesium: 0.004wt% , rare earth: 0.005wt%, the content of unavoidable impurity elements is less than 0.5%wt, and the rest is zinc.

Step 1. The raw materials are copper, magnesium and boron purchased on the market. After testing and testing, they are selected and processed. After passing the test, the proportioning is carried out according to the requirements of the core material composition (wherein boron can be made into an intermediate alloy and added), and the prepared material is Transport to the smelting site for smelting, the smelting temperature is controlled at 980-1150 degrees Celsius, the traction speed is 1.0-3.5 m/min), and the specifications of the produced continuous casting rods are 6.0-16.0mm in diameter.

After surface treatment, the above-mentioned continuous casting slabs are subjected to multi-pass plastic processing and recrystallization annealing to produce brass wires with a diameter of 0.95 mm and a copper content of 79.0 wt %, and then use a chemical method to cover a zinc layer with a thickness of 30 μm , to produce the mother blank 2.

Step 2, plastically processing the material (master blank 2) made in step 1 to a wire rod whose specification is 0.5mm;

Step 3. Heat treatment the wire rod prepared in step 2. The heat treatment atmosphere is as follows: the oxygen content is selected between 15-30%, the heat treatment temperature is 405°C, and the holding time is 9 hours. The mother blank 3 is produced and cooled in the furnace To 50 degrees Celsius out of the oven, raw.

Step 4, using continuous pulling and continuous annealing equipment to carry out high processing rate stretching and stress relief annealing on the mother blank 3 made in step 2 (the workpiece is under the condition of less than 550 ° C, the annealing speed is 850-1500 m/min, annealing The distance is 0.5-10 meters, and then in the annealing liquid (annealing liquid can also be called stewing oil, annealing and stewing oil is a common saying in the industry, and it can be bought on the market, such as the type of multidraw DG produced in Germany; There are also many domestic products, such as FX128, etc.) for post-processing, the temperature of the annealing solution is 15-100 degrees), and coiling and winding, the specification of the finished product is 0.25mm after stretching, and the tensile strength of the cutting line is measured by the test. The strength is 815N/mm ² ;

1. Compare cutting line C with any compound cutting line III on the market;

2. The one-way wire cutting machine used in the test is the FA10SADVANCE2009 machine manufactured by Mitsubishi;

3. The test conditions are as follows: the size of the workpiece cut in the test is 84.0*4.5*4.5 (0.5*3 groove); the material of the workpiece: SKD11; the equipment parameters: NM; the number of processing: one repair three; The tension parameter is adjusted to fit a cutting line of 700N/ ^mm2 ; the nozzle is pressed against the workpiece. Record the cutting effects of the two types of cutting wires, as shown in Table 3 below:

The cutting effect of two types of cutting wires in embodiment 3 of table 3

Cutting line category total processing time first knife speed time to first cut Work piece roughness Straightness (μm)

Contrast line Ⅲ 31.40 points 1.1-1.6mm/min 18.35 points Ra＝0.850 4 cutting line C 30.45 points 1.3-1.8mm/min 17.70 points Ra=0.844 3

Note: The straightness in this table is the maximum absolute value difference of the three dimensions above, below and below the height of 85.

4. It can be seen from Table 3 that when the surface roughness of the workpiece is improved, the cutting efficiency is increased by 3.11% based on the total cutting time, and the speed of the first knife is increased by 3.67%. The speed increase is not very high and the straightness It is slightly improved, and the processing of the cutting line C is easier, and the cost has a certain advantage, which is more suitable for industrial production.

Example 4

Manufacture the cutting wire D with the cutting wire diameter of the present invention being 0.25mm, characterized by: copper: 77.0wt%, magnesium: 0.005wt%, boron: 0.001wt%, rare earth: 0.008wt%, the content of other elements is 0.5wt%, Other elements are iron and phosphorus, the content of unavoidable impurity elements is less than 0.5wt%, and the rest is zinc; the surface metals are: copper: 41.0wt%, oxygen: 0.0005-1.0wt%, magnesium: 0.0025wt%, rare earth : 0.004wt%, the content of unavoidable impurity elements is less than 0.5%wt, and the rest is zinc.

Step 1. The raw materials are copper, magnesium and boron purchased on the market. After testing and testing, they are selected and processed. After passing the test, the proportioning is carried out according to the requirements of the core material composition (wherein boron can be made into an intermediate alloy and added), and the prepared material is Transport to the smelting site for smelting, the smelting temperature is controlled at 980-1150 degrees Celsius, the traction speed is 1.0-3.5 m/min), and the specifications of the produced continuous casting rods are 6.0-16.0mm in diameter.

After surface treatment, the above-mentioned continuous casting slabs are subjected to multi-pass plastic processing and recrystallization annealing to produce brass wires with a diameter of 0.95 mm and a copper content of 77.0 wt %, and then use a chemical method to cover a zinc layer with a thickness of 33 μm , to produce the mother blank 2.

Step 2, plastically processing the material (master blank 2) made in step 1 to a wire rod whose specification is 0.65mm;

Step 3: Carry out heat treatment to the wire rod prepared in step 2. The heat treatment atmosphere is as follows: the oxygen content is selected between 15-30%, the heat treatment temperature is 405°C, and the holding time is 9 hours to generate the mother blank 3, which is cooled to Bake at 50 degrees Celsius.

Step 4, using continuous pulling and continuous annealing equipment to carry out high processing rate stretching and stress relief annealing on the mother blank 3 made in step 2 (the workpiece is under the condition of less than 550 ° C, the annealing speed is 850-1500 m/min, annealing The distance is 0.5-10 meters, and then in the annealing liquid (annealing liquid can also be called stewing oil, annealing and stewing oil is a common saying in the industry, and it can be bought on the market, such as the type of multidraw DG produced in Germany; There are also many domestic products, such as FX128, etc.) for post-processing, the temperature of the annealing solution is 15-100 degrees), and coiling and winding, the specification of the finished product is 0.25mm after stretching, and the tensile strength of the cutting line is measured by the test. The strength is 815N/mm ² ;

1. Compare the cutting line D with any common galvanized cutting line IV on the market;

2. The one-way wire cutting machine used in the test is the FA10SADVANCE2009 machine manufactured by Mitsubishi;

3. The test conditions are as follows: the size of the workpiece cut for the test is 84.0*4.5*4.5 (0.5*3 groove); the material of the workpiece: SKD11; the equipment parameters: NM; The tension parameter is adjusted to suit the cutting line of 700N/mm2; the nozzle is pressed against the workpiece. Record the cutting effects of the two types of cutting wires, as shown in Table 4 below:

The cutting effect of two types of cutting wires in embodiment 4 of table 4

Cutting line category total processing time first knife speed time to first cut Work piece roughness Straightness (μm) Contrast line IV 34.17 points 1.0-1.5mm/min 21.53 points Ra＝0.828 3 cutting line D 29.45 points 1.3-1.8mm/min 17.60 points Ra＝0.842 3

Note: The straightness in this table is the maximum absolute value difference of the three dimensions above, below and below the height of 85.

4. It can be seen from Table 4 that in the case of a slight decrease in the surface roughness of the workpiece, it has been proved that the magnitude of the decrease in roughness does not affect the use of the final cutting material, and the ordinary galvanized wire can cut the thickness of more than 80mm The phenomenon of zinc powder falling off the workpiece is more serious, and based on the total cutting time, the cutting efficiency has increased by 16.02%, the speed of the first knife has increased by 22.33%, and the straightness is the same. Under the condition of basically the same manufacturing cost, the total cutting efficiency has improved More than 15%, the use cost of the final customer is significantly reduced.

The above-mentioned embodiments illustrate the present invention, rather than limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change of the present invention will fall into the protection scope of the present invention.

Claims (6)

1. the unidirectional wire line of cut of low magnesia, it is characterized in that: this line of cut comprises core and top layer complex metal layer, the group of alloys of core becomes: copper 75-85wt%, magnesium 0.0005-0.50wt%, boron 0.0005-0.03wt%, rare earth 0.0005-0.02wt%, other element: 0.05-1.0wt%, other described element is at least two kinds in titanium, iron, silicon, nickel, manganese, aluminium, tin, phosphorus, and inevitable impurity is less than 0.5wt%, and all the other are zinc; The group of alloys of described top layer complex metal layer becomes: copper 35-45wt%, oxygen 0.0005-3.0wt%, magnesium 0.0002-0.25wt%, rare earth 0.0005-0.01wt%, and inevitable impurity is less than 0.5%wt, and all the other are zinc.

2. the unidirectional wire line of cut of low magnesia according to claim 1, it is characterized in that: the group of alloys of described core becomes: copper 75-80wt%, magnesium 0.0005-0.01wt%, boron 0.0005-0.01wt%, rare earth 0.0005-0.02wt%, other element 0.05-0.5wt%, the content sum of described copper, zinc, magnesium, boron is less than 99.5wt%, and wherein Zn content is greater than 19.5wt%; The group of alloys of described top layer complex metal layer becomes: copper 40-45wt%, oxygen 0.0005-1.0wt%, magnesium 0.0002-0.008wt%, rare earth: 0.0005-0.01wt%, and all the other are zinc.

3. the unidirectional wire line of cut of low magnesia according to claim 1, it is characterized in that: the group of alloys of described core becomes: copper 80-85wt%, magnesium 0.005-0.50wt%, boron 0.005-0.03wt%, rare earth 0.0005-0.02wt%, other element 0.05-0.5wt%, the content sum of described copper, zinc, magnesium, boron is less than 99.5wt%, and wherein Zn content is greater than 14.5wt%; The group of alloys of described top layer complex metal layer becomes: copper 35-40wt%, oxygen 0.01-3.0wt%, magnesium 0.0005-0.25wt%, rare earth 0.0005-0.01wt%, and all the other are zinc.

4. the unidirectional wire line of cut of the low magnesia according to the arbitrary claim of claim 1-3, is characterized in that: the thickness of the top layer complex metal layer of this line of cut is greater than 5.0% of line of cut final diameter and is less than 23.0%.

5. the unidirectional wire line of cut of the low magnesia according to the arbitrary claim of claim 1-3, is characterized in that: total conductance of this line of cut is for being greater than 25.5%IACS to 37.5%IACS.

6. the manufacture method of the unidirectional wire line of cut of low magnesia, it is characterized in that: adopt alloying continuous casting melting and casting that each raw material of formula rate is continuously cast into brass base bar at the temperature of 980-1250 degree Celsius, produce core through plastic working and recrystallization annealing; Core passes through the method for electroless plating or machinery at Surface mulch one deck zinc, heat-treat in an oxidizing atmosphere, heat treated air pressure is 0.5-12.5 MPa, and oxygen content is 10-90wt%, and heat treatment temperature is 250-450 degree Celsius; Then 250-450 degree Celsius of insulation 2.0-16.0 hour, then cool to 50 degrees Celsius with the furnace; Make material produce incomplete recrystallized annealing and chemical reaction, produce the top layer complex metal layer of top layer cupric zinc-magnesium oxygen; Continuous annealing processing is carried out to the composite adopting aforesaid way to make, produces unidirectional wire line of cut.