KR820000429B1 - Method of fabricating aluminum alloy rod - Google Patents

Abstract

An elec. conducting Al alloy wire, having increased ultimate elongation, bendability and fatigue resistance when compared to conventional Al alloy wire of the same tensile strength has evenly distributed FeAl3 inclusions in an alloy contg.<99.70 Al, >=0.30Fe, and <=0.15% Si. The evenyl distributed inclusions are obtained by continuously casting the alloy to form a continuous Al alloy bar, hot working immediately after casting to form a continuous rod which is subsequently wire drawn without intermediate anneals, and then annealing.

Description

Manufacturing method of aluminum alloy rod

The present invention relates to the production of aluminum alloy wires suitable for use as conductive wires, and more particularly to the production of aluminum alloy rods for the production of aluminum alloy wires with suitable conductivity and improved elongation, bendability and tensile strength.

The use of various aluminum alloy wires (commonly referred to as EC wires) as general purpose conductive wires is a well established fact in the art. In addition, aluminum alloy wires have been used as windings, multi-conductor wires and telephone cables for electromagnets. The alloys used in these applications have a conductivity of at least 61% in accordance with international interlocking standards (hereinafter sometimes referred to as IACS), and their chemical composition is significant in pure aluminum and in small amounts of silicon, vanadium, iron, copper, manganese, magnesium, It contains common impurities such as zinc, boron and titanium. It has been proven that the physical properties of conventional aluminum alloy wires are undesirable for various applications. In general, the desired elongation can only be obtained below the desired tensile strength and the desired tensile strength can only be obtained below the desired elongation. In addition, the conventional aluminum alloy wire is very low in flexibility and fatigue resistance, which is generally unsuitable for various desirable applications.

Therefore, the need for aluminum alloy conductors with improved elongation and improved tensile strength has emerged in the industry, and also there is a need for conductors that can withstand numerous bends at certain points and maintain fatigue resistance while being used as conductors. Therefore, it is one of the objects of the present invention to provide an aluminum alloy lead having excellent conductivity and physical properties so that it can be used for new applications. It is yet another object of the present invention to provide aluminum alloy leads with novel properties of increased maximum elongation and tensile strength, improved flex and fatigue resistance, and good conductivity.

These objects, forms, and advantages of the present invention will become apparent to those skilled in the art in light of the following detailed description of the invention.

The aluminum alloy wire according to the present invention is manufactured from an alloy containing silicon of about 99.70 wt% or less of aluminum, about 0.30 wt% or more of iron, and 0.15 wt% or less of aluminum. The preferred aluminum content of this alloy is about 98.95-99.45% by weight, particularly when it contains 99.15-99.40% by weight of aluminum. In addition, a suitable content of iron in the present alloy is about 0.45-0.95% by weight, and particularly excellent results are obtained when it contains 0.50-0.80% by weight of iron.

It is preferable that the silicon used for this alloy does not exceed 0.07 weight%. The percentage ratio of iron to silicon is 1.99: 1 or higher and preferably 8: 1 or higher. Therefore, if the amount of iron in this aluminum alloy is at the lower end of the above range, the percentage of aluminum should be increased rather than increasing the percentage of silicon to deviate from the above limit. Properly treated conductors with aluminum alloy components within the above ranges have adequate conductivity, improved tensile strength and maximum elongation, in addition to surprisingly increased flexibility and fatigue resistance.

The aluminum alloy is prepared by first melting the aluminum together with the required amount of iron or other components needed for the process. It is common for the amount of silicon to be kept as low as possible without adding it during melting. In addition, ordinary impurities, that is, trace components are present in the melt, but each is present in a trace amount of less than 0.05% by weight, and the total amount of impurities generally does not exceed 0.15% by weight. Of course, when controlling the amount of microcomponents, the conductivity of the final alloy must be taken into account. This is because some microcomponents have a greater impact on conductivity than others. Typical microcomponents are vanadium, copper, manganese, magnesium, zinc, boron and titanium. If the amount of titanium is relatively high (but very low compared to the amounts of aluminum, iron and silicon), adding a small amount of boron to offset excess titanium will prevent the conduction of the conductor from decreasing.

Iron is the major component added to the melt to produce the alloy of the present invention. Usually about 0.50% by weight is added to the aluminum component used to make this alloy. Of course, the scope of the present invention includes controlling the amount of all alloy components and increasing or decreasing the amount of iron added.

The molten aluminum composition after alloying is continuously cast into continuous bars. The bar is hot worked as received from the casting machine.

A typical hot work consists of casting the bar into a bar and then rolling the bar with a rolling mill.

A continuous casting and rolling process for producing a continuous rod is, for example, as follows.

The continuous casting machine moves the continuous casting machine from the continuous casting machine to the rolling mill as it solidifies the molten aluminum alloy metal to become a cast bar, and gives the rolling mill a substantial motion to the casting bar along a plurality of angularly arranged axes. It acts as a device for hot forming a cast bar to form a rod or other hot formed body.

Continuous casting machines are a conventional type with casting wheels and casting wheels with casting grooves partially blocked by endless belts supported by idler pulleys. The cast ring and endless belt form a mold, and the molten metal is poured into one end of the mold to solidify and the casting bar is extracted in the state of being substantially solidified from the other end.

Rolling mills are a commonly used type with a number of rolling stands arranged to hot mold the cast bar by a series of deformations. The continuous casting machine and the rolling mill are positioned relative to each other so that the casting bar immediately enters the rolling mill as it is substantially solidified after being solidified. Under these conditions, the cast bar is at a temperature within the temperature range for hot forming the cast bar at the beginning of hot forming without heating between the casting machine and the rolling mill. If precisely controlling the hot forming temperature of the casting bar within the normal temperature range of hot forming, a temperature control device of the casting bar may be installed between the continuous casting machine and the rolling mill.

The rolled stand has a plurality of rolls in which the cast bar is engaged. There are two or more rolls of the rolled stand, which are arranged opposite each other or at equal intervals with respect to the moving shaft of the casting bar through the rolling mill.

The roll of each rolling stand of the rolling mill is rotated at a predetermined speed by one or several electric motors and the cast wheel is rotated at a speed determined by its operating characteristics. The rolling mill hot-forms the casting bar so that as it enters the rolling mill, it becomes a rod having a cutting area smaller than that of the casting bar.

The circumferential surface shape of the roll of the adjacent rolling stand in the rolling mill is changed. That is, the cast bars are engaged in different directions by a series of rolls of rolled stands having different shaped surfaces. This different engagement of the cast bar in the rolling stand serves to knead or form the base metal in the cast bar in such a way that it acts on each rolling stand while simultaneously reducing the cross-sectional area of the cast bar by the cross-sectional area of the rod.

Since each rolling stand is engaged with the casting bar, it is preferable that the casting bar enters a sufficient volume per hour in the rolling stand relative to the casting bar to fill the space formed by the roll of the rolling stand so that the roll effectively acts on the metal of the casting bar. However, the space created by the roll of each roll stand is preferably not overfilled so that the casting bar is not forced into the gap between the rolls. Therefore, it is preferable that the rods are fed toward each of the rolled stands in a volume per unit time which is sufficiently filled but not too overfilled by the space created by the rolls of the roll stands.

Since the casting bar is accepted from a continuous casting machine, one wide face corresponding to the surface of the endless band is tapered inward to correspond to the shape of the groove in the casting wheel. As the cast bar is compressed by the roll of the rolled stand, the cast bar is deformed to form a cut surface created by the adjacent circumference of the roll of each rolled stand.

As described above, a myriad of cast aluminum alloy rods having different lengths are produced by hot forming or rolling a cast aluminum bar simultaneously with casting a molten aluminum alloy.

The continuous rods produced by the casting and rolling process are compressed to produce continuous lines of various standard dimensions.

Cold drawn rods (ie, f-tempered) are drawn through a series of gradually smaller dies without intermediate annealing to create a continuous line of the desired diameter. After this drawing operation, the alloy wire has a very high tensile strength, its maximum elongation falls below the allowable limit, and the conductivity falls below the lowest allowable value of 61% of IACS. The wire is either completely annealed or partially annealed to the desired tensile strength and then cooled.

It has been found that the annealed alloy wires have excellent conductivity and surprisingly improved maximum elongation as described previously herein and improved tensile strength and surprisingly increased flexibility and fatigue resistance. The annealing operation is suitable for continuous annealing, such as resistance annealing, induction annealing, reflux annealing by a combustion furnace or heat radiating annealing by a continuous furnace, or annealing in a batch furnace. In continuous annealing, the temperature is 232-648 ° C and the time is about 5-1 / 10,000 minutes. In general, however, the continuous annealing temperature and time within the range in which the desired tensile strength can be obtained are controlled in relation to the overall process.

In the case of discontinuous annealing, the temperature is kept at 204-398 ° C. for about 30 minutes to 24 hours. As mentioned in the continuous annealing, the time and temperature in the discontinuous annealing can be adjusted to suit the whole process as long as the desired tensile strength can be obtained. The tensile strength of the ball aluminum wire obtained for the discontinuous annealing temperature and time is shown in the following table.

TABLE 1

During continuous casting of this alloy, a significant amount of iron present in the alloy is precipitated from the solution as iron aluminum intermetallic compound (FeAl ₃ ). Therefore, after casting, the bar contains FeAl ₃ dispersed in a matrix of supersaturated solid solution. The supersaturated matrix contains 0.17 weight percent iron. As soon as the bar is hot rolled, the FeAl ₃ particles are destroyed and dispersed into the matrix structure, and formation of large particles is suppressed. If the rod is drawn to the final size without intermediate annealing and then aged in the final annealing operation, the pinning phenomenon is caused by preferential precipitation of FeAl ₃ in the cell size and the position where the tensile strength, elongation and flexibility are small. It is increased because of pinning. Therefore, the new transfer member must be activated under the stress of the drawing process, which causes further improvement in tensile strength and elongation.

The property of this aluminum alloy wire is FeAl in the matrix₃ It is affected by the size of the particles. Coarse precipitation promotes nucleation and growth of large particles, thereby lowering the recrystallization temperature of the alloy wire, thereby reducing elongation and bending rate. Microprecipitation improves elongation and bending by reducing nucleation and increasing recrystallization temperature. Severely Coarse FeAl₃The precipitation of the alloy wire tends to be brittle and cannot be used. The coarse precipitation particle size is 2,000 angstroms or more and the fine precipitation is the particle size 2,000 stroms or less.

Typical alloy AWG 12 of the present invention has a tensile strength of 11.2 kg / mm2, a maximum elongation of 20%, an IACS conductivity of 61%, and a number of bends to break of 20. The physical properties of the AWG 12 line made from this alloy were about 8.4-15.4kg / mm2 of tensile strength, about 40-50% of maximum elongation, about 61-63% of conductivity, and about 45-10 of bending times leading to fracture. to be.

When making special final products, adjustments can be made at the manufacturing stage and additional steps can be carried out. Therefore, when the insulated wire is manufactured, the rods manufactured continuously are pressed down to the AWG line 0000 (section diameter or the maximum parallel face distance 11.684 mm) to the line 40 (section diameter or the maximum parallel face distance 0.07874 mm). After annealing, the aluminum alloy wire is continuously insulated in a standard continuous insulation process. A typical insulation process is to pass the leads through an extrusion head. As it passes through the extrusion head, a continuous thermoplastic insulation coating is applied to the conductor surface. The sheath is cooled by contact with an air stream or a cooling bath. The insulating material should be of sufficient thickness to insulate the conductors and be able to withstand the physical hazards of use.

Typical insulation thickness is between about 0.40-1.19mm. Suitable thermoplastic insulation materials are polyvinyl chloride and materials such as neoprene, polypropylene and polyethylene are also used.

Insulation coating AWG 12 of the present invention has a physical property of 11.2kg / ㎜ tensile strength, 20% maximum elongation, 61% conductivity and 30 bending times to break. The range of physical properties of line 12 made from this alloy ranges from tensile strength of about 9.1-14 kg / mm2, maximum elongation, about 35-5%, electrical conductivity of 61-63%, and fracture flexural recovery of 45-10.

Preferred alloy wires for use in the present invention have a tensile strength of between 9.8-12.6 kg / mm 2 and a maximum elongation of between 30-15%, a conductivity of 61-63% and a breakage recovery of 40-15.

In the case of manufacturing insulated telephone wire, it is continuous drawn and annealed from AWG 12 wire (section diameter or maximum parallel face distance is 2.074mm) to AWG 30 wire (section diameter or maximum parallel face 0.254mm) and then aluminum alloy wire is standard continuous Insulate continuously in an insulation process.

A typical insulation process is to pass an alloy wire through an extrusion head. As the alloy wire passes through the extrusion head, a continuous thermoplastic insulation coating is made on the wire surface. The sheath is contacted with an air stream or a cooling bath to make the cabinet. The insulating material must have the ability to insulate the alloy wires, and the thickness must be sufficient to insulate the alloy wires and to withstand the physical hazards of processing the alloy wires with telephone wires. Typical insulation thickness is about 0.0254-5.08 mm. Suitable insulators are polyethylene and materials such as neoprene, polypropylene and polyvinyl chloride are also used.

Insulate the wires individually, then tie two or more insulated wires together and braid them in pairs. These pairs are cabled into groups and these groups become larger groups or cables. These groups or cables are fed to a second extrusion head, where they each have an insulating sheath around the insulated wires. A thin sheet of plastic material or tape may be wrapped around the military or cable before applying the insulation. The insulated telephone cable exits from the second extrusion head and is cooled by contacting the airflow or cooling bath.

Suitable external insulation materials are polyethylene, together with thermoplastics such as polypropylene, polyvinyl chloride and neoprene. If necessary, the finished telephone cable can be sheathed once again according to conventional methods.

The representative AWG line 18 of the aluminum alloy wire suitable for use in the telephone cable of the present invention has a physical property of 11.9kg / mm2 tensile strength, 14% maximum elongation, and 61% conductivity IACS. The general physical properties of the AWG 18 line made of this alloy range from about 9.1-15.4 kg / mm2 of tensile strength, about 40-5% of maximum elongation, and about 61-63% of conductivity.

Preferred alloys have a tensile strength of 11.2-12.6 kg / mm 2, a maximum elongation of 20-10% and a conductivity of 61-63%.

In order to manufacture windings for all-electric electromagnets, continuous drawing is performed from 8 AWG wire (section diameter or maximum parallel facing distance 3.2512mm) to AWG 40 wire (section diameter or maximum parallel facing distance 0.07874mm). The microannealed rod is cold drawn through a series of progressively compressed dice to form a continuous line of the desired diameter without intermediate annealing. If the shape of the cut surface is not desired to be round, a suitable die may be made by cold rolling the drawn line or by drawing through a suitable rolling mill or die. Typical cut sections other than round shapes are polygons and rectangles.

After annealing, the aluminum alloy wire is continuously insulated by standard insulation process. A typical insulation process is to pass a enamel bath while aqueous continuous enamel insulation is formed in a continuous furnace. The insulating enamel must be sufficiently insulating and its thickness must be able to withstand the physical hazards of use.

Suitable insulating materials include enamels such as oil-based resins, fibers, polyethylene, polypropylene, polyvinyl chloride, polyurethane, epoxy, polyvinyl proline resins, nylon coated polyvinyl formalin resins, urethane modified polyvinyl formalin resins Nylon coated on polyurethane, linear polyester coated on modified polyester, polyimide resin, cotton fiber and polyester can be used. When thermoplastic resin is used as insulation material, it is common to cover the wire as it moves through the head by using the extrusion head.

A representative insulated electromagnet coiled wire AWG 12 of the present invention is prepared from a line having a tensile strength of 11.2 kg / mm 2, a maximum elongation of 20%, a conductivity of 61% IACS, and a breakage number of break of 30. The range of physical properties of AWG 12 produced from this alloy ranges between about 8.4-11.9 kg / mm2 tensile strength, about 40-15% elongation, 61-63% conductivity, and 45-15 fracture times. Preferred alloy wires for use in the present invention are tensile strength 9.1-10.5 kg 2, maximum elongation 35-25%, electrical conductivity 61-63% and flexural recovery 35-20.

When manufacturing multi-filament wires made of a plurality of filaments, continuous drawing is performed to form an annealing between AWG 0000 (section diameter or maximum parallel face distance 11.684mm) to AWG 40 (section diameter or maximum parallel face distance 0.07874mm). After each filament wire is twisted together with other wires, a multi-conductor wire made of multiple filaments is produced and subsequently insulated in a standard continuous insulation process. A typical insulation process is to pass a twisted wire through the extruder head. As the conductor passes through the extruder head, a thermoplastic insulation coating is continuously applied around the conductor. The coated conductor is cooled by contact with an air stream or a cooling bath. Insulating material should be able to insulate the multi-conductor wires and the thickness of the insulation should be able to bind the wires and to withstand the physical hazards to the wires. Typical thicknesses of insulators are about 0.025-1.00 mm.

Preferred thermoplastic insulating materials are polyvinyl chloride or neoprene, rubber, polyethylene, polypropylylene and crosslinked polyethylene and the like.

Typical AWG 12 for multi-conductor wires has physical properties of 11.2kg / mm2 tensile strength, 20% maximum elongation, 61% conductivity IACS, and 30 times of fracture flexion. The general physical properties of the AWG 12 line made of this alloy range from about 9.1-15.4 kg / mm2 of tensile strength, about 35-5% of elongation, about 61-63% of conductivity, and about 45-10 of flexural fracture. The preferred tensile strength is 9.1-12.6kgmm2, the maximum elongation is 35-15, the electrical conductivity 61-63% ICAS, the fracture flexion frequency is 40-15%.

Conductors made from this alloy may be joined together in a stranded manner, such as concentric, aggregate, parallel and rope, before each insulation.

In the concentric type, six or more single wires are spirally twisted around a single central wire to insulate the outer surface of the stranded wire through the extrusion head of the two-day extruder.

In the collective type, a plurality of disconnected wires are twisted together somewhat and insulation coating is performed on the outer surface thereof.

In the case of parallel type, insulation coating is to be carried out by tying each alloy wire side by side without twisting.

In the rope type, stranded cable is twisted into several wicked or collective strands to form a composite cable, and the entire outer surface of the cable is insulated.

Insulated stranded cables of this alloy have been demonstrated to have superior flexibilities than those of ordinary insulated and EC alloys.

In the following examples the invention will be more fully understood.

Example 1

The comparison between the known EC aluminum wire and the aluminum alloy wire of the present invention is 99.73% by weight of aluminum, 0.18% by weight of iron, 0.059% by weight of silicon and 99.45% by weight of aluminum, 0.45% by weight of iron, and 0.45% by weight of silicon. This alloy wire was made by 0.056% and a trace amount of impurity.

These alloys are continuously cast and cold drawn to produce AWG 12.

The cutting alloy wires are collected in separate bobbins and annealed in a batch furnace at various temperatures and times to produce conventional EC alloys and present alloys of various tensile strengths. Experiment with a device to measure the number of flexures required to break a specific flexure. With uniform force and tension, the device bends each sample at about 135 degrees. Bend the alloy wire over a pair of mandrels facing each other with a diameter equal to the diameter of the alloy wire. The spacing of the mandrels is at a distance of 1 to 1.5 times that of the alloy wire. From the vertical position of the alloy wire to one limit, to return vertically, to the opposite limit; Once returned to the original vertical position, one bend is recorded. For all test samples the bending speed and the forces and tensions acting on them are the same.

The following results were obtained.

TABLE IIA

As shown in Table IIA, the alloy has a surprisingly improved bendability over conventional EC alloys.

Samples of this alloy AWG 12 and EC alloy AWG 12 treated as described above are tested for maximum elongation in accordance with standard test methods. The elongated length of the alloy wire is measured at break. Maximum elongation is calculated by dividing the increased length of the alloy wire sample by the original length. The tensile angle of the alloy wire sample is the force required for fracture in the maximum elongation test, expressed as the pressure per cross section. The result is as follows.

TABLE IIB

As shown in Table IIB, this alloy has a surprisingly improved maximum elongation than conventional EC alloys.

Example 2-7

Six aluminum alloys are produced by varying the amount of the main component. These alloys are described in the following table.

TABLE III

Six alloys were cast continuously into six bars and hot rolled to six continuous rods. Cold drawn through a progressively compressed die to create AWG 12. Alloy wires made from the alloys of Examples 2 and 4 were annealed and the remainder was annealed in a batch furnace to obtain tensile strength as described in Table IV.

After annealing, each alloy wire was tested for conductivity, tensile strength, maximum elongation, and average number of bendings. After slow cooling, the standard test method, except for using the method described in Example 1, to determine the average number of flexures leading to failure, the average bending to electrical conductivity, tensile strength, maximum elongation and breaking by standard test methods Each was tested for recovery. These results are shown in the following table.

TABLE IV

From these results, it can be seen that the line of Example 2 is inferior in both the elongation and the bendability as compared to the other because of the outside of the component range of the present invention.

Example 8

An aluminum alloy containing 99.42 weight percent aluminum, 0.50 weight percent iron, 0.55 weight percent silicon and trace amounts of common impurities is prepared.

The continuous bar is cast by hot rolling and hot rolled to produce a continuous rod. Cold drawn through a progressively compressed die to create AWG 12. Alloy wires were collected on a 76 cm (30 inch) bobbin until they weighed about 113 kg. The bobbin is placed in a cold General Electric Bell and the temperature is raised to 249 ° C. The temperature is maintained for 3 hours and then cooled to 204 ° C. The furnace is then quenched and the bobbins are removed. The test results revealed that the alloy wire had a conductivity of 61.5% IACS, a tensile strength of 11.5kg / mm 2, a maximum elongation of 20%, and a number of bends of 18 to break.

Example 9

The same procedure as in Example 8 was carried out except that the temperature of the bellows was raised to 260 ° C. and maintained for 3 hours before cooling. The annealed alloy wire has a conductivity of 61.4% IACS, a tensile strength of 10.5kg / mm2, a maximum elongation of 27%, and a number of bends of 28 to break.

Example 10

The same procedure as in Example 8 was carried out except that the temperature of the bellows was raised to 316 ° C. and maintained for 3 hours before cooling. The annealed alloy wire has an electrical conductivity of 61.2% IACS, a tensile strength of 9.8kg / mm 2, a maximum elongation of 30%, and a number of bends of 43 to fracture.

Example 11

The treatment was carried out in the same manner as in Example 8 except that the temperature of the bellows was raised to 310 ° C. and maintained for an hour and a half before cooling. The annealed alloy wire has a conductivity of 61.5% IACS, a tensile strength of 11.2 kg / mm 2, a maximum elongation of 21%, and a number of bends of 23 to break.

Example 12

The alloy of Example 8 was cast to make a continuous bar and then hot rolled to create a continuous rod of 0.95 cm (3/8 inch) diameter.

The AWG 14 line was prepared by cooling the rod through a die that was gradually compressed. This is redrawn on a Synchro Model BG-16 drawing machine with a continuous resistance annealer. The alloy wire is drawn to AWG 28 at a final speed of 1,000 meters per minute, and the annealer is fixed to the transformer tap at number 8 and operated at 52 volts. Annealed alloy wire has a conductivity of 62% IACS, a tensile strength of 10.8 kg / mm 2, and a maximum elongation of 25%. Since the diameter of the alloy wire is very small, the number of bends leading to breakage is quite large.

Example 13

An alloy of the same component as in Example 8 was cast to form a continuous bar and hot rolled to produce a continuous rod having a diameter of 0.95 cm (3/8 inch). Cold drawn using a synchro-type F × 13 stretching machine equipped with a continuous annealer.

The final speed is drawn at 610m / min to AWG 12, the preheater No. 1 voltage is 35 volts, the preheater No. 2 is 35 volts, and the annealer is 22 volts. Three transformer taps are fixed at five. The conductivity of the annealed alloy wire is 62% IACS, tensile strength 11.4kg / mm2, and maximum elongation 20%.

Example 14

[Insulated wire]

The aluminum alloy is 99.42 wt% aluminum, 0.50 wt% iron, 0.055 wt% silicon, and is prepared so that ordinary impurities are present in trace amounts. The alloy is cast into continuous bars and hot rolled to produce a continuous rod.

This is cold drawn through a die that is gradually compressed into an AWG 12 line. Collect them on a 30-inch bobbin until the line weighs approximately 113 kg. The bobbin is placed in a general electric bellows and the temperature is raised to 249 ° C. The furnace temperature is maintained at 249 ° C. for 3 hours and when the heat is lost the furnace is cooled to 204 ° C. The furnace is then quenched and the bobbins are removed. The annealed wire is passed through an extruder head and insulated with polyvinyl chloride.

The short circuit insulated from the test results in a 61.6% IACS conductivity and an improved physical symbol.

Example 15

[Insulated wire]

The alloy of Example 14 was cast to form a continuous bar and hot rolled to improve a continuous f temper rod of 0.95 cm (3/8 inch). Cold drawn using a model F × 13 drawing machine with a sink equipped with a continuous annealer. The final speed is drawn at 915 m / min to AWG 12, the continuous annealer voltage is 35 volts in preheater 1, 35 volts in preheater 2, and the annealing device is operated at 22 volts. Secure the three transformer taps to five. The annealing wire is passed through an extruder head and continuously insulated with polyvinyl chloride. Annealed and insulated wires have a conductivity of 62% IACS and have improved physical properties.

It should be understood, in part, that the present invention relates to insulated conductors of aluminum alloys. The term "insulated conductors" includes insulated cables consisting of individual insulated aluminum alloy conductors.

Examples of special insulated wires or cables formed by the present invention include construction wires, NM sheathed cables, underground construction wires, distribution cables, TW-type single wires, harness wires, neon-signed cables, wireless connection wires, and security fire alarms. Wires, buried wires, control wires, machine tool wires, enunciator wires, DD wire wires and railway signal cables.

Example 16

[Insulated telephone cable]

An aluminum alloy is produced in which 99.42% aluminum, 0.50% iron, 0.055% silicon and trace amounts of ordinary impurities are present. The alloy is cast into continuous bars and hot rolled to form a continuous rod. Cold drawn through progressively compressed dice to form AWG 12.

Gather the wires in a 76 cm (30 inch) bobbin until the gathered wire weighs approximately 113 kg. The bobbin is then placed in a cold general electric furnace to raise the temperature to 249 ° C. The furnace temperature is maintained at 249 ° C. for 3 hours and then the furnace is cooled to 204 ° C. The furnace is then quenched and provided with bobbins. The annealed wire is passed through an extruder head and insulated with polyethylene. The two insulated wires are gathered together untwisted and sent to the second extruder head and insulated with polyethylene.

Example 17

[Insulated telephone cable]

The alloy of Example 16 was cast into continuous bars and hot rolled to produce a continuous f temper rod of 0.95 cm (3/8 inch) in diameter. Cold draw with a model F × 13 stretching machine with a continuous annealing device.

The final speed is drawn at 610m / min to AWG 12, the voltage of continuous annealing device in preheater 1 is 22 volts, 35 volts in preheater 2 and 22 volts. Three transformers are fixed at five. The annealed wire is passed through an extruder head and continuously insulated with polypropylene. Each of the eight insulated wires is typically twisted together and fed to a second extruder head which is sheathed with polypropylene.

Each wire of the telephone cable can be treated to have a tensile strength that can withstand the forces applied during the insulation process using polyethylene as the insulating material. Since polyethylene is a standard insulating material, each alloy wire should be able to insulate with this polyethylene.

However, if polyethylene is used as an insulating material, the maximum elongation is increased and the flexibility is improved while the tensile strength is decreased. In this particular form, the tensile strength is lowered because the alloy wire cannot pull the alloy wire from the combiner head with a strong force when polyethylene is used as the insulating material.

In addition, when two or more insulated wires are used as telephone cables, the alloy wires are twisted in the form of concentric, collective, cross, parallel and rope or in pairs to form cables. Twisted or cabled alloy wire is insulated as described above. The number of wires in the cable of the invention is not limited and may be taped or sheathed prior to extrusion or tubing.

Example 18

[Wound for insulated electromagnet]

An aluminum alloy containing 99.42% aluminum, 0.50% iron, 0.055% silicon and small amounts of common impurities is produced. The alloy is cast into continuous bars and hot rolled to produce a continuous rod. Cold drawn through a progressively compressed die to make AWG 12. The alloy wire is collected in the bobbin until the gathered wire weighs about 113 kg. Place the bobbin in a cold general electric bellows and raise the temperature to 249 ° C. The temperature of the furnace is maintained at 249 ° C. for 3 hours and the furnace is cooled to 204 ° C. The annealed wire is passed through an enamel bath and insulated with enamel. The test results showed that the insulated alloy magnetic wire had a conductivity of 61.61% IACS, a tensile strength of 11.6kg / mm2, and a maximum elongation of 19.8%.

The most interesting fact about this electromagnet alloy wire is that the annealing increased the elongation at higher tensile strength than the annealed EC alloy wire. In addition, when annealing the EC alloy wire to improve the elongation, the alloy wire must be completely softened. As the alloy wire of the present invention increases the annealing time and temperature, the elongation is gradually improved, and excellent elongation is obtained even without completely softening.

Example 19

[Insulated roughness wire]

An aluminum alloy containing 99.42 wt% aluminum, 0.50 wt% iron, 0.055 wt% silicon and trace amounts of common impurities is prepared. The alloy is cast into continuous bars and hot rolled to form a continuous rod. Cold drawn with progressively compressed dice to form AWG 12. The alloy wire is collected in a 76 cm (30 inch) bobbin until the gathered wire weighs approximately 113 kg. Place the bobbin in a cold general electric bellows and raise the temperature to 249 ° C. The furnace temperature is maintained at 249 ° C. for 3 hours and cooled to 204 ° C. The annealed wire is twisted concentrically with six other wires produced in the same way. The twisted unit is passed through an extruder head and insulated with polyvinyl chloride. The test results show that the insulated forged lead alloy wire has a conductivity of 61.6% IACS and improved physical properties.

Example 20

[Insulated roughness wire]

An aluminum alloy containing 99.42% aluminum, 0.50% iron, 0.055% silicon and trace amounts of typical impurities is prepared. The alloy is cast into continuous bars and hot rolled to form a continuous rod. Twist concentrically with six other wires made in the same way. Gather the gathered wires into 76 cm (30 inch) bobbins until they weigh about 113 kg. The bobbin is placed in a cold general electric bellows, the temperature is raised to 249 ° C. for 3 hours, the furnace is cooled and the bobbin removed. The twisted unit is fed from the bobbin to the extruder head and insulated with polyvinyl chloride.

It was found by testing that the insulated alloy wire of the multi-conductor wire had a conductivity of 61.6% IACS and improved physical properties.

It should be understood that the present invention relates, at least in part, to insulated aluminum alloy conductors.

Examples of specially insulated multi-conductor cables and cables include building cables, automotive ignition primary wiring cables, underground structure wiring cables and battery cables, underground cables, aircraft cables, Haners cables, neon sign cables, wireless connection cables, security fire alarm cables, and buried Cable, control cable, cable for machine tool, innator cable, heater cord, lamp cord, electric cord, welder and mine cable, towing cable, sheath cable, SEU cable insulated with crosslinked polyolefin, overhead cable, braided cable , Instrument wiring cables and composite cables of aluminum or copper centered on iron or aluminum alloys.

The meanings of the predicates used herein to clarify the purpose of the present invention are as follows.

It is a solid product that is longer than the rod-section and usually has a cross section of 7.62-0.95 cm.

It is a machined product of solid length which is longer than wire-section, and its cross section is circular, square, rectangular, regular hexagon and square octagon. Its cross sectional diameter or maximum parallel face distance is in the range of 0.95-0.007874 cm.

While the invention has been described in particular detail with respect to preferred embodiments, it is to be understood that changes and modifications can be made within the spirit and scope of the invention.

Claims (1)

A) 98.95 to 99.54 weight percent aluminum, 0.45 to 0.95 weight percent iron, 0.015 to 0.15 weight percent silicon and 0.0001 to 0.05 weight percent microcomponents of vanadium, copper, manganese, zinc, boron and titanium The total weight percentage of the microcomponents is 0.004 to 0.15 weight percent and the alloy has an iron content ratio of at least 8: 1 to make silicon. B) Continuous casting of the alloy forms a continuous casting bar. A method of producing an aluminium alloy rod by presenting the hot working of the casting bar before the casting bar is cooled below the hot working temperature without intermediate annealing.