CN110349692B - Preparation process of motor winding precision wire of service robot - Google Patents
Preparation process of motor winding precision wire of service robot Download PDFInfo
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- CN110349692B CN110349692B CN201910654459.6A CN201910654459A CN110349692B CN 110349692 B CN110349692 B CN 110349692B CN 201910654459 A CN201910654459 A CN 201910654459A CN 110349692 B CN110349692 B CN 110349692B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/30—Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect
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Abstract
The invention discloses a preparation process of a motor winding precision wire of a service robot, which relates to the technical field of electric wires and cables and mainly comprises the working procedures of material selection, wire drawing, copper plating, tin plating, paint film spraying and post-treatment, so that the wire with a copper-clad aluminum inner core, a tin plating layer and an insulating layer in sequence from the center to the outside is obtained. According to the preparation process disclosed by the invention, the tin-coated copper aluminum of the obtained central conductor of the wire can reduce the alternating current impedance effect generated by higher harmonics, and compared with pure red copper with the same specification and size, the copper-coated aluminum has lower cost and lighter weight than pure copper materials. The surface molecule binding property of the copper tinning and copper clad aluminum material is good, the adhesive force is strong, the heat dissipation is good, the skin effect and the proximity effect of the conductor are effectively reduced, the direct welding property of the conductor is improved, and the problem of surface oxidation of the conductor is solved.
Description
Technical Field
The invention relates to the field of wires and cables, in particular to a preparation process of a motor winding precision lead of a service robot.
Background
The material of the enameled wire is mainly composed of a conductor and an insulating layer, a bare copper wire is softened through vacuum or continuous annealing and flattened through a specific mould, artificial synthesis or organic fiber center twisting is added in the center, and the enameled wire is manufactured through a paint film spraying and baking process. Although the enameled wires have different characteristics, the enameled wires have mechanical properties, chemical properties, electrical properties and thermal properties, and are widely applied to relays, micro and special motors and electronic transformers of automobiles, household appliances, mobile phones, computers and office electronic products. In the practical application process of a specific electronic and electric product, most enameled wires generally have the phenomena of slow conductor heat dissipation, high on-resistance and skin effect of current flowing on the surface; secondly, the motor or the transformer or the relay is not covered in place in a winding process at a specific angle or area.
The square wire conductor material in the metal material industry is applied to a winding wire of a micro motor, although the winding overlapping rate and power are high, the sectional area heat dissipation effect of the conductor is good, and the transmission skin effect of the surface of the conductor is improved, the conductor resistance of the central conductor is high, the second layer of paint film material is prone to poor stress cracking under the action of external stress, particularly severe eccentricity and poor ellipticity exist in the size, the surface coating is poor in finish, and the third layer of paint film and the second layer of paint film are poor in adhesive force and weak in molecular bonding force under the conditions of compatibility and high-temperature heating. And finally, the manufacturing process comprises the following steps: because the self-adhesion temperature and time are not reasonably optimized, poor adhesive force and insulativity are easy to generate, and potential quality hazards of safety, stability and durability are directly brought to the service life and working power output of the application electric appliance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to improve the manufacturing process, how to obtain a motor winding precision wire for a service robot, which has strong adhesive force and good heat dissipation, can effectively reduce the skin effect and the proximity effect of a conductor and improve the direct welding performance of the conductor, and meets the special requirement of the motor winding of the robot on the precision wire.
Therefore, the invention discloses a preparation process of a motor winding precision wire of a service robot, which comprises the following steps:
s1, selecting materials, and selecting a required aluminum rod;
s2, drawing, namely drawing the raw material aluminum rod to the required specification to obtain aluminum wires;
s3, copper plating, wherein a copper plating process is carried out on the surface of the obtained aluminum wire to form a copper-clad aluminum inner core of the wire;
s4, tinning, namely tinning the surface of the copper-clad aluminum inner core to obtain a tinned layer, and forming a lead conductor comprising the copper-clad aluminum inner core and the tinned layer;
s5, spraying a paint film, spraying the paint film on the surface of the conductor of the lead and baking to form an insulating layer on the surface of the conductor;
and S6, post-treating, and obtaining the lead comprising the conductor positioned inside and the paint film insulation layer coated on the surface of the conductor through the post-treatment process.
In a further scheme, the step of drawing the wire by S2 specifically comprises the following steps:
s21, drawing wires for the first time, and sequentially carrying out large drawing and middle drawing processes on the aluminum rod to obtain aluminum wires;
s22, paying off, namely performing vacuum annealing on the aluminum wire obtained after the intermediate drawing and then paying off the aluminum wire at constant tension;
and S23, drawing wire for the second time to the required specification, and then cleaning and drying for preparing subsequent copper plating and tin plating.
In a further scheme, in the step of drawing at S2, aluminum wires with the specification of phi 2.6mm are obtained through first drawing, and aluminum wires with the specification of phi 1.0mm are obtained through second drawing.
In a further scheme, in the S4 tin plating step, white tin with the mass parts of zinc and lead being less than or equal to 0.0005% is adopted, and the thickness of a tin plating layer formed on the copper clad aluminum core is 0.003-0.005 mm.
In a further scheme, in the step of S4 tin plating, the copper clad aluminum inner core to be subjected to tin plating sequentially passes through an annealing furnace tube, a water tank, a pickling tank and a tin furnace, and finally a wire is wound up; isopropanol scaling powder is added into the tin furnace, and the scaling powder comprises 7 mass percent of ammonium chloride, 4 mass percent of zinc chloride and 30 mass percent of industrial hydrochloric acid.
In a further scheme, after the step of S4 tin plating, the method further comprises the steps of flattening the conductor of the lead into a square shape by using a square diamond coating wire drawing and pressing die, and then performing S5 paint film spraying; the wire conductor sequentially passes through a first round wire drawing and pressing die with the diameter of 1.019mm, a second square wire drawing and pressing die with the side length of 0.902mm, a third square wire drawing and pressing die with the side length of 0.799mm and a chamfer of 0.025mm, a fourth square wire drawing and pressing die with the side length of 0.708mm and a chamfer of 0.035mm, a fifth square wire drawing and pressing die with the side length of 0.627mm and a chamfer of 0.045mm, a sixth square wire drawing and pressing die with the side length of 0.555mm and a chamfer of 0.050mm and a take-up and sizing die with the side length of 0.553 mm.
In a further aspect, the S5 paint film spraying process includes:
and S51, spraying an MPPO paint film on the surface of the tinning layer, wherein the MPPO paint film is formed by spraying the MPPO paint film, the linear speed of the MPPO paint film spraying process is 25-30m/min, the paying-off tension is 15-18kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-12min, so that the MPPO paint film with the thickness of 0.040-0.055mm is finally obtained.
In a further aspect, the S5 paint film spraying process further includes:
s52, spraying a PI paint film on the surface of the MPPO paint film, wherein the linear speed of the PI paint film spraying process is 25-30m/min, the paying-off tension is 16-19kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-15min, so that the PI paint film with the thickness of 0.040-0.055mm is finally obtained.
In a further aspect, the S5 paint film spraying process includes:
s53, spraying an insulating carbon black paint film on the surface of the PI paint film, wherein the insulating carbon black paint film is sprayed at a linear speed of 20-25m/min, a pay-off tension of 17-20kgf, a spraying temperature of 72 +/-3 ℃ and a baking time of 15-20min, and the insulating carbon black paint film with a thickness of 0.014-0.016mm is finally obtained.
In a further aspect, the S6 post-processing step includes cooling, lubricating, cleaning and winding the wire after the insulating layer is formed.
According to the preparation process disclosed by the invention, the tin-coated copper aluminum of the obtained central conductor of the wire can reduce the alternating current impedance effect generated by higher harmonics, and compared with pure red copper with the same specification and size, the copper-coated aluminum has lower cost and lighter weight than pure copper materials. The surface molecules of the copper tinning and copper clad aluminum material have good binding property and strong adhesive force; the heat dissipation performance is good, the conductor skin effect and the proximity effect are effectively reduced, the direct welding performance of the conductor is improved, and the problem of conductor surface oxidation is solved.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
FIG. 1 is a flow chart of a process for manufacturing a precision wire for a motor winding of a service robot;
fig. 2 is a schematic cross-sectional view of a motor winding precision conductor of a service robot.
In the figure, the method comprises the following steps: 1-copper clad aluminum inner core, 2-tin coating, 3-MPPO paint film, 4-PI paint film and 5-insulating carbon black paint film.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
In a specific embodiment, with reference to fig. 1, a method for preparing a precision wire for a motor winding of a service robot is disclosed, which sequentially comprises the steps of material selection, wire drawing, copper plating, tin plating, paint film spraying and post-treatment.
S1 sorting
According to actual requirements, the required wire drawing raw material pure aluminum rod is selected, the specification of the aluminum rod is 8.0 mm-2.6 mm, and the aluminum content is more than or equal to 99.6%. In the step, the raw materials need to be strictly checked, and the quality of the pure aluminum rod of the raw materials directly influences the performance of the finally obtained precise wire.
S2 drawing wire
And drawing the pure aluminum rod to the required specification phi 1.0mm to form the copper-clad aluminum core of the wire. The method specifically comprises the following processes:
s21, drawing wires for the first time, and sequentially carrying out large drawing and middle drawing processes on the pure aluminum rod to enable the aluminum rod to become an aluminum wire with the specification of 2.6 mm;
s22, paying off, namely carrying out vacuum annealing on the aluminum wire obtained by the first wire drawing and then paying off at constant tension;
and S23, drawing for the second time, drawing the aluminum wire for the second time to obtain the aluminum wire with the specification of phi 1.0mm, and cleaning and drying the aluminum wire for subsequent copper plating and tin plating.
S3 copper plating
And performing a copper plating process on the surface of the obtained aluminum wire to form a copper-clad aluminum inner core of the wire.
S4 tin plating
After the wire drawing step, tin plating is carried out on the surface of the copper-clad aluminum inner core to obtain a tin plating layer with the thickness of 0.003-0.005mm, and a lead conductor comprising the copper-clad aluminum inner core and the tin plating layer is formed. The tin-plated copper-clad aluminum conductor part can reduce the alternating current impedance effect generated by higher harmonics, and compared with pure red copper with the same specification and size, the copper-clad aluminum has lower cost and lighter weight than pure copper materials; the surface molecules of the copper tinning and copper clad aluminum material have good binding property and strong adhesive force; the heat dissipation performance is good, the conductor skin effect and the proximity effect are effectively reduced, the direct welding performance of the conductor is improved, and the problem of conductor surface oxidation is solved.
The specific tinning operation comprises the steps of sequentially placing tinned buses below a pay-off rack before starting, covering a wire placing cover, preparing wire threading and a P5-P20 wire coil (for wire collection), and placing white tin blocks meeting the requirements into a tin furnace (ensuring that the content/mass parts of white tin, zinc and lead are less than or equal to 0.0005%).
Checking whether each part of the machine is normal, turning on a control power supply, putting enough water in a water tank, setting the temperature of the tin furnace, the cooling water tank and the annealing furnace on a control box, then turning on respective switches to start preheating, and setting the temperature of the tin furnace to be 250-350 ℃.
After the tin blocks are melted and the temperature of each part rises to a set value, each bus sequentially passes through a pay-off guide wheel, an annealing furnace tube, a water tank, a pickling tank and a tin furnace from a pay-off reel, then is drawn, and is temporarily placed in a winding manner of a take-up table; then, the single-sided copper wires are collected on the last glue shaft, and then isopropanol scaling powder (the scaling powder is prepared according to 100kg of water and comprises 7 percent of ammonium chloride, 4 percent of zinc chloride and 30 percent of industrial hydrochloric acid) is added into a tin furnace; so as to increase the surface adhesive force of copper and tin and improve the glossiness of the tinned copper wire. The main components of the pickling tank are as follows: ammonium chloride, zinc chloride and industrial hydrochloric acid. When the appearance quality of the lead is normal, each wire is separately wound on each shaft, and a wire winding motor is started, so that the wire winding speed, the tension, the wire arrangement speed and the width are adjusted. And collecting the shaft for replacement when the shaft is replaced.
Specifically, the tinning machine mainly comprises a pay-off stand, an annealing furnace, a tin furnace, a drawing machine, a take-up table, a control box and the like.
A pay-off rack: is formed by welding channel steel and other section steel. The paying-off and stabilizing parts are distributed on the upper surface, and the bus below the paying-off rack is paid off to the annealing furnace through the paying-off parts. The annealing furnace, the water tank and the pickling tank are supported by a pay-off rack. The water tank is arranged behind the annealing furnace, and a 1.5KW heating tube is arranged in the water tank in order to ensure that the water temperature reaches a certain requirement.
Annealing furnace: the furnace machine is formed by welding high-quality steel plates and is divided into an upper cover and a lower cover, and an asbestos plate, insulating bricks, refractory bricks, a furnace plate and the like are sequentially placed in the furnace. 45 1.2KW heating tubes are transversely arranged in the furnace, 40 stainless seamless steel tubes and phi 14 stainless steel tubes are longitudinally arranged to serve as copper wire channels and heating places.
A tin furnace: the furnace body is assembled and welded by steel plates and angle steels. The tin pot is formed by casting HT200, heat-insulating bricks, heat-resisting bricks, furnace plates and the like are arranged below the tin pot, 4 furnace wires are arranged in the furnace, and each wire is 5000W. After being annealed, the copper wire enters the tin pot to be tinned under the action of the wire pressing rod.
A drawing machine: the drawing wire mainly plays a role in drawing, the surface of the drawing wheel is plated with hard chrome, the drawing wheel is wear-resistant and rust-proof, the motor is 1HP belt with stepless speed change, and the fastest speed is adjustable at 250 m/min.
A wire take-up table: the number of the wire take-up tables is two, each wire take-up table has 20 heads, the number of the wire take-up motors is 2.5KW-CM, the number of the wire take-up motors is 40, each wire take-up table is provided with 20 0-130V voltage regulators and 16 KVA20A large voltage regulator, and the speed and the tension of the motors are adjusted by adjusting the voltage. The power of the wire arranging motor is 0.75KW, and the wire arranging motor is matched with a stepless speed change and 80 type 60: 1 speed reducer. The reverse linear motion of the flat cable is realized by the bevel gear, the gear row and the travel switch.
In addition, after the step of S4 tin plating, the method also comprises the steps of flattening the conductor wire into a square shape by using a square diamond coating drawing and pressing die, and then carrying out S5 paint film spraying. The wire drawing and compacting die is generally divided into an inlet area, a lubricating area, a compression area, a sizing area and an outlet area. The wire conductor sequentially passes through a first round wire drawing and pressing die with the diameter of 1.019mm, a second square wire drawing and pressing die with the side length of 0.902mm, a third square wire drawing and pressing die with the side length of 0.799mm and a chamfer of 0.025mm, a fourth square wire drawing and pressing die with the side length of 0.708mm and a chamfer of 0.035mm, a fifth square wire drawing and pressing die with the side length of 0.627mm and a chamfer of 0.045mm, a sixth square wire drawing and pressing die with the side length of 0.555mm and a sixth square wire drawing and pressing die with the side length of 0.553mm, and the wire diameter of the square copper wire after being drawn is guaranteed to be within the range of +/-0.003 mm through maximum precision.
In the case of round conductors, the paint film can be sprayed directly after tinning without the conductor part being flattened to a square shape.
S5 spray paint film
After the tin plating step, a paint film is sprayed on the surface of the conductor part and baked to form an insulating layer on the surface of the conductor.
In the S5 paint film spraying process, the method comprises the following steps:
and S51, spraying an MPPO paint film on the surface of the tinning layer, wherein the MPPO paint film is formed by spraying the MPPO paint film, the linear speed of the MPPO paint film spraying process is 25-30m/min, the paying-off tension is 15-18kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-12min, so that the MPPO paint film with the thickness of 0.040-0.055mm is finally obtained. MPPO adopts a modified polyphenyl ether paint film; the flame-retardant cable has the advantages of environmental stress cracking resistance, excellent dimensional stability, outstanding electrical insulation, good flame retardance, steam resistance, heat resistance, wear resistance and excellent dielectric property; good stamping resistance and creep resistance, light weight, no toxicity and environmental protection.
S52, spraying a PI paint film on the surface of the MPPO paint film, wherein the linear speed of the PI paint film spraying process is 25-30m/min, the paying-off tension is 16-19kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-15min, so that the PI paint film with the thickness of 0.040-0.055mm is finally obtained. PI (self-lubricating aromatic self-adhesive polyimide paint film) H-level high-heat-resistance hot-melt self-adhesive paint with smooth surface; has good adhesive property, low friction coefficient and expansion coefficient, and can resist heat of 180 degrees. As a PI paint film used on the surface of an electromagnetic wire, the polyimide film has excellent heat resistance, and the decomposition temperature can reach 750 ℃; the mechanical property is excellent, the elastic modulus of the fiber is second to that of the carbon fiber, and the elastic modulus can reach 500 Mpa; good chemical stability, humidity resistance, corrosion resistance and hydrolysis resistance (can resist 2 atmospheres and 120 ℃/500H water boiling); good radiation resistance, 5 x 109The intensity can be kept 86% after the radiation of the rad dose; the dielectric property is excellent, the dielectric constant is less than 3.5, the dielectric constant of the fluorine-containing polyimide material can reach 2.5, the dielectric loss is 10, and the dielectric strength is 100-300KV/mm, volume resistance up to 1015-1017Omega.cm; the dielectric property is at the first place of plastics. Low temperature resistance, high flame retardance and good biocompatibility. And secondly, the PI insulating paint film has high breakdown voltage, good insulating adhesive force and excellent moisture-proof thermal conductivity.
S53, spraying an insulating carbon black paint film on the surface of the PI paint film, wherein the insulating carbon black paint film is sprayed at a linear speed of 20-25m/min, a pay-off tension of 17-20kgf, a spraying temperature of 72 +/-3 ℃ and a baking time of 15-20min, and the insulating carbon black paint film with a thickness of 0.014-0.016mm is finally obtained. The superfine insulating carbon black can increase the opacity of the material and reduce the cost; secondly, the electrical conductivity and the thermal conductivity of the central conductor can be changed; after the surface of the carbon black is completely cured, the precise wire has the functions of water resistance, moisture resistance, dust prevention, insulation, heat conduction, confidentiality, corrosion resistance, temperature resistance and shock resistance, and the mechanical and environmental properties of the material are greatly changed.
S5 post-processing
After an insulating layer is formed on a conductor part, the whole lead is cooled, lubricated, cleaned and taken up. And then packaging, quality inspection, warehousing and the like can be carried out.
With reference to fig. 2, the final structure of the motor winding precision conductor of the service robot obtained by the process of the invention sequentially comprises a copper-clad aluminum inner core 1, a tin coating 2, an MPPO paint film 3, a PI paint film 4 and an insulating carbon black paint film 5 from inside to outside. In a further scheme, the cross-sectional area of the copper-clad aluminum inner core 1 is 0.2704-0.3025mm2The thickness of the tin coating 2 is 0.003-0.005mm, the thickness of the MPPO paint film 3 is 0.040-0.055mm, the thickness of the PI paint film 4 is 0.040-0.055mm, and the thickness of the insulating carbon black paint film 5 is 0.014-0.016 mm.
Performance testing
1. Main test instrument
1) Copper wire elongation tester (including maximum breaking force project test);
2) a conductor resistance tester;
3) a liquid fungus/mould tester;
4) a withstand voltage tester/insulation resistance tester;
5) softness/flex testers;
6) two-dimensional projector/paint film pinhole test;
7) a paint film adhesion tester;
8) sodium chloride solution tester.
2. Test results
1) Conductor resistance (20 ℃): the maximum value is 132.1 omega/KM, and the actual value is 93.25 omega/KM;
2) minimum elongation: the standard is more than or equal to 20 percent, and the actual is more than or equal to 23.5 percent;
3) flexibility and adhesion and appearance: the paint film is not cracked, and the surface is smooth and has no scars;
4) adhesion force: x30MIN at 180 deg.C, standard is not less than 0.5N/mm, and actual is not less than 1.1N/mm;
5) rebound angle: the standard is less than or equal to 5 degrees, and the actual angle is less than or equal to 3 degrees;
6) the minimum thermal shock temperature is: 260 ℃/30 MIN;
7) breakdown voltage: the standard AC is more than or equal to 1.0KV, and the actual AC is 1.3-1.5 KV.
8) Soldering tin temperature resistance: soldering resistance (no damage of soldering tin: 300 ℃, 10 seconds); direct weldability (solder is smooth and has no residue: 390 ℃, 5 seconds).
9) Normal saline pinhole: less than or equal to 3 holes, and no pin hole is formed after the saline water test.
The motor winding precision conductor of the service robot increases the surface contact resistance of the conductor and the intergrowth performance of the conductor through tinning the surface of a copper clad aluminum material; the natural color process of the metal material body and the plastic material body is combined and enhanced, so that the contact area is increased to achieve the three-dimensional comprehensive heat dissipation effect; the mechanical strength, the electrical comprehensive performance and the radiation resistance of the material are mutually complemented and enhanced through the performance of the metal material and the high polymer material. In general, the conductor of the precise lead has small resistance, light weight (relatively less copper is used, the cost is low), and the skin effect and the proximity effect are obvious, thereby meeting the direct current resistance requirement of the conductor; and meanwhile, the alternating current impedance effect generated by higher harmonics and good corrosion resistance can be reduced. In addition, the surface of the conductor has strong heat dissipation capacity, good thermal stability and high winding coverage rate; the conductor insulating layer paint film has strong stress cracking resistance; the surface smoothness and the adhesive force of a conductor paint film are good; the conductive paint film has good compatibility, and the impregnating varnish and the paint film have compatibility. The precise lead has the advantages of water resistance, moisture resistance, dust resistance, insulation, temperature resistance, shock resistance, and good mechanical and environmental properties.
Known and potential technology/product application fields and application modes thereof
The known technology in the precision wire industry is as follows: the existing special-shaped conductors comprise oval, rectangular and square conductors, but the specification tolerance, the process and the material application thereof and the application level of resisting a specific environment need to be greatly improved and perfected.
The potential technology of the precision wire industry is as follows: in the process of continuously developing and innovating new metal materials in the future, particularly the development and application of new composite metal materials, the adhesive force and specific environment resistance of the metal materials and the special polymer plastic materials are more and more strict, and the surface blending technology of the special composite engineering plastic materials and graphene appears in emerging application markets through a continuously developing process.
This precision wire product application field: the high-power direct current induction heating coil is widely applied to the aspects of inductors, micro motors, heating earphones, special automobile main power lighting transformers, military miniature direct current motors and the like in heating equipment voice coils, portable notebook computers and HI-FI high-definition cinema audio and video equipment.
The application mode of the precision lead product is as follows: the permanent magnet servo motor is applied to miniature permanent magnet servo motor motors of service robots, educational robots, unmanned planes, small-sized aviation aircrafts, field exploration, mine explosion prevention, deep sea diving and the like.
Here, the upper, lower, left, right, front, and rear merely represent relative positions thereof and do not represent absolute positions thereof. The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A preparation process of a motor winding precision wire of a service robot comprises the following steps:
s1, selecting materials, and selecting a required aluminum rod;
s2, drawing, namely drawing the raw material aluminum rod to the required specification to obtain aluminum wires;
s3, copper plating, wherein a copper plating process is carried out on the surface of the obtained aluminum wire to form a copper-clad aluminum inner core of the wire;
s4, tinning, namely tinning the surface of the copper-clad aluminum inner core to obtain a tinned layer, and forming a lead conductor comprising the copper-clad aluminum inner core and the tinned layer;
s5, spraying a paint film, spraying the paint film on the surface of the conductor of the lead and baking to form an insulating layer on the surface of the conductor;
s6, post-treating, and finally obtaining the lead comprising the conductor positioned inside and the paint film insulation layer coated on the surface of the conductor through the post-treatment process;
wherein, in the S5 paint film spraying process, the method comprises the following steps:
s51, spraying an MPPO paint film on the surface of the tinning layer, wherein the MPPO paint film is formed by spraying the MPPO paint film, the linear speed of the MPPO paint film spraying process is 25-30m/min, the paying-off tension is 15-18kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-12min, so that the MPPO paint film with the thickness of 0.040-0.055mm is finally obtained;
s52, spraying a PI paint film on the surface of the MPPO paint film, wherein the linear speed of the PI paint film spraying process is 25-30m/min, the paying-off tension is 16-19kgf, the spraying temperature is 72 +/-3 ℃, and the baking time is 10-15min, so that the PI paint film with the thickness of 0.040-0.055mm is finally obtained;
s53, spraying an insulating carbon black paint film on the surface of the PI paint film, wherein the insulating carbon black paint film is sprayed at a linear speed of 20-25m/min, a pay-off tension of 17-20kgf, a spraying temperature of 72 +/-3 ℃ and a baking time of 15-20min, and the insulating carbon black paint film with a thickness of 0.014-0.016mm is finally obtained.
2. The preparation process of the motor winding precision conductor of the service robot as claimed in claim 1, wherein the S2 wire drawing step specifically comprises the following steps:
s21, drawing wires for the first time, and sequentially carrying out large drawing and middle drawing processes on the aluminum rod to obtain aluminum wires;
s22, paying off, namely performing vacuum annealing on the aluminum wire subjected to the intermediate drawing and then paying off at constant tension;
and S23, drawing wire for the second time to the required specification, and then cleaning and drying for preparing subsequent copper plating and tin plating.
3. The process for preparing the precise wire for the motor winding of the service robot as claimed in claim 2, wherein in the step of drawing at S2, the aluminum wire with the specification of 2.6mm is obtained by drawing for the first time, and the aluminum wire with the specification of 1.0mm is obtained by drawing for the second time.
4. The process for preparing a precision wire for motor windings of a service robot as claimed in claim 1, wherein in the step of S4 tin plating, white tin with zinc and lead in parts by mass less than or equal to 0.0005% is used, and the tin plating layer formed on the copper-clad aluminum core has a thickness of 0.003-0.005 mm.
5. The process for preparing the motor winding precision lead of the service robot as claimed in claim 4, wherein in the step of S4 tin plating, the copper clad aluminum inner core to be tin plated is sequentially passed through an annealing furnace tube, a water tank, a pickling tank and a tin furnace, and finally a wire is taken up; isopropanol scaling powder is added into the tin furnace, and the scaling powder comprises 7% by mass of ammonium chloride, 4% by mass of zinc chloride and 30% by mass of industrial hydrochloric acid.
6. The process for preparing a precision wire for motor windings of a service robot as claimed in claim 1, wherein after the step of tin plating S4, the process further comprises the steps of flattening the conductor of the wire into a square shape by using a wire drawing and pressing die with a square diamond coating, and then spraying a paint film S5; the conductor of the lead sequentially passes through a first round wire drawing and pressing die with the diameter of 1.019mm, a second square wire drawing and pressing die with the side length of 0.902mm, a third square wire drawing and pressing die with the side length of 0.799mm and a chamfer of 0.025mm, a fourth square wire drawing and pressing die with the side length of 0.708mm and a chamfer of 0.035mm, a fifth square wire drawing and pressing die with the side length of 0.627mm and a chamfer of 0.045mm, a sixth square wire drawing and pressing die with the side length of 0.555mm and a chamfer of 0.050mm and a square take-up sizing die with the side length of 0.553 mm.
7. The process for preparing a precise wire for the motor winding of a service robot as claimed in claim 6, wherein the post-processing step of S6 includes cooling, lubricating, cleaning and winding the wire after forming the insulating layer.
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