CN104300714A - Novel squirrel-cage motor rotor conducting bar and manufacturing method thereof - Google Patents

Abstract

The invention discloses a novel squirrel-cage motor rotor conducting bar which comprises the following components by mass percent: 1.5-1.7% of silicon and the balance of copper and inevitable impurities. A manufacturing method comprises the steps of putting a silicon block and electrolytic copper into an intermediate-frequency electric furnace for smelting according to the components, casting a raw material melt for smelting production into a copper-silicon ingot circular blank by a downward continuous casting machine, extruding the copper-silicon ingot circular blank into a semifinished conducting bar by an extruding machine with working pressure of 25Mpa, extruding heating temperature of 870 DEG C and extruding speed of 0.2m/min, and drawing the semifinished conducting bar into the finished conducting bar by a hydraulic drawing machine with working pressure of 12Mpa and drawing speed of 10m/min. The conducting bar is stable in conductivity, good in soldering property, very considerable in economic benefit and excellent in mechanical property; a requirement of a motor for the conductivity of the conducting bar can be met; a low silver solder can be selected; the silver content of the solder is reduced from 45% to 30%; and great material expenses can be saved annually.

Description

A kind of novel squirrel-cage motor rotator sliver and manufacture method thereof

Technical field

The invention belongs to machine field, particularly relate to a kind of novel squirrel-cage motor rotator sliver and manufacture method thereof.

Background technology

The soldering of end ring and rotor bar is an important step in motor production procedure, and the quality of brazing quality directly has influence on the performance parameter of motor.

Wherein, not only desired strength is high, plasticity good for rotor bar, brazing property is excellent, the operating mode that more will use according to motor, electric motor starting electric current are different, drag load moment of inertia size, when starting damping moment curve shape and start time motor terminal voltage size, and need rotor bar to have stable conductivity.

Traditional HP _b59-1, HS _nthe rotor bar materials such as 62-1, QAl9-4, owing to not examining its conductivity performance in material national standard, therefore its conductivity performance extremely unstable, and brazing property is poor.

Summary of the invention

Based on this, for above-mentioned technical problem, provide a kind of novel squirrel-cage motor rotator sliver and manufacture method thereof.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

A novel squirrel-cage motor rotator sliver, its Ingredient percent is: silicon 1.5%-1.7%, and surplus is copper and inevitable impurity.

The invention still further relates to a kind of manufacture method of novel squirrel-cage motor rotator, comprise the following steps:

Composition: the Ingredient percent of squirrel-cage motor rotator sliver is: silicon 1.5%-1.7%, surplus is copper and inevitable impurity;

Melting: silico briquette and cathode copper are put into middle frequency furnace melting by mentioned component;

Strand: by under draw the raw material liquation that melting produces by conticaster and cast copper silicon ingot circle base, liquation pouring temperature 1190 DEG C, draws note speed 800 turns/hour, cast hydraulic pressure 2Mpa;

Extrude semi-finished product: by extruder, copper silicon ingot circle base is extruded into sliver semi-finished product, extruder operating pressure 25Mpa, extruding heating-up temperature 870 DEG C, extrusion speed 0.2 m/min;

Pulling finished goods: sliver semi-finished product are drawn into sliver finished product by hydraulic drawbench, hydraulic drawbench operating pressure 12Mpa, drawing speed 10 ms/min.

Sliver stable conductivity of the present invention, can meet the requirement of motor to sliver conductivity, brazing property is good, can select low-silver solder, the silver content of solder is down to 30% by original 45%, can save the millions of unit of fee of material every year, economic benefit is considerable, and good mechanical performance.

Embodiment

A novel squirrel-cage motor rotator sliver, its Ingredient percent is: silicon 1.5%-1.7%, and surplus is copper and inevitable impurity.

The present embodiment also relates to a kind of manufacture method of novel squirrel-cage motor rotator, comprises the following steps:

Composition: the Ingredient percent of squirrel-cage motor rotator sliver is: silicon 1.5%-1.7%, surplus is copper and inevitable impurity;

Melting: silico briquette and cathode copper are put into middle frequency furnace melting by mentioned component.

Particularly, based on mentioned component, by weight method proportioning, get silico briquette and the cathode copper surplus of 1.6%, add melting in middle frequency furnace, heat up after all dissolving, copper in stove and silicon are stirred simultaneously, after stirring sampling detect, detect qualified after again stir.

Strand: by under draw the raw material liquation that melting produces by conticaster and cast copper silicon ingot circle base, liquation pouring temperature 1190 DEG C, draws note speed 800 turns/hour, cast hydraulic pressure 2Mpa;

Extrude semi-finished product: by 1200T hydraulic horizontal list hole water seal extruder, copper silicon ingot circle base is extruded into sliver semi-finished product, extruder operating pressure 25Mpa, extruding heating-up temperature 870 DEG C, extrusion speed 0.2 m/min;

Particularly, copper silicon ingot circle base is heated to 870 DEG C come out of the stove, the extrusion die of corresponding specification loaded onto by extruder, carry out half-finished extruding with the extrusion speed of 0.2 m/min, then carry out blank inspection, extruding can be continued after the assay was approved, wherein, the extruding heating-up temperature of 870 DEG C and 0.2 m/min of extrusion speed can improve a lot to the interior molecules institutional framework improvement of sliver, and to electric conductivity in guarantee product, mechanical stability plays a crucial role.

Pulling finished goods: by full-automatic 50T hydraulic drawbench, sliver semi-finished product are drawn into sliver finished product, hydraulic drawbench operating pressure 12Mpa, drawing speed 10 ms/min.

The present embodiment sliver good mechanical performance, stable conductivity, the requirement of motor to sliver conductivity can be met, and braze ability is good, can select low-silver solder, the silver content of solder is down to 30% by original 45%, can save the millions of unit of fee of material every year, economic benefit is considerable, in table 1, table 2 and table 3.

Wherein, table 1 is mechanical properties data table.

Table 1

Table 2 is electrical performance data table.

Table 2

Table 3 is brazing property comparison sheet.

Table 3

In order to verify the mechanical performance of sliver of the present invention, electrical property and brazing property, be below corresponding demonstration test:

One, mechanical test

Test method is with reference to GB/T11363-2008.

(1) tension test

According to practical condition, red copper, copper silicon is selected to be mother metal.Solder is BAg30CuZnSn, and brazing flux is FB112.During test, pull-rod one end is red copper (T2), and the other end is red copper (T2), copper silicon (THMD) respectively.The average tensile strength of soldered fitting is in table 4.

Mother metal	Average tensile strength (MPa)
		Red copper+red copper	226.8
Red copper+copper silicon	225.2

Table 4

(2) shearing test

Sample one end is red copper (T2), and the other end is red copper (T2), copper silicon (THMD) respectively.Solder is BAg30CuZnSn, and brazing flux is FB112.Sample all adopts lap joint, all breaks in mother metal.The shearing force of soldered fitting is in table 5.

Base metal test specimen is numbered	Red copper+red copper (kN)	Red copper+copper silicon (kN)
			1	25.5	25.0
2	25.5	25.5
			3	25.5	26.0

Table 5

Two, the bend test of soldered fitting, test method is with reference to ASME standard Ⅸ volume QB-160.

Sample one end is red copper (T2), and the other end is red copper (T2), copper silicon (THMD) respectively.Solder is BAg30CuZnSn, and brazing flux is FB112.Sample all adopts banjo fixing butt jointing.During bend test, pressure head diameter is 40mm, and angle of bend is 60 °.

After bending, on the Extrude Face of red copper and red copper brazed coupon in brazed seam region, along the equal zero defect in any direction.Indivedual red copper and copper silicon brazed coupon find that there is defect, but defect length is all less than 3mm, meet relevant regulations in ASME standard Ⅸ volume: after bending, guided bend sample convex surface any direction is measured, all must not there is the flaws being greater than 3mm, in bend test process except the crackle of sample edges and corners generation.

Three, using low-silver solder to prove that copper silicon sliver welds with short-circuited conducting sleeve: the feasibility of BAg30CuZnSn, also having carried out brazing filler metal procedure qualification work with reference to ASME standard Ⅸ volume related request.The size and dimension of technique test specimen is according to product actual conditions, and wherein the material of rotor bar is respectively red copper and copper silicon, and the actual brazing process of analog equipment.Brazing filler metal testing new process project is tension test and slice test.

(1) technique test specimen joint slice test, test method is with reference to ASME standard Ⅸ volume QB-180.

In design of electrical motor manufacture process, more it is envisaged that the requirement of electric conductivity aspect, namely how to ensure will there be reliable contact between rotor bar with short-circuited conducting sleeve.Joint area is enough large, makes its commissure contact resistance value as far as possible little, thus does not affect the performance parameter of motor.We are by dissecting soldered fitting for this reason, check brazed seam compactness.

After dyeing inspection has been carried out to brazed seam, find that copper silicon sliver welded seam area has indivedual spilehole, but each side face defects rate of sample is not all more than 5%, is better than relevant regulations in ASME standard Ⅸ volume: the total length in non-brazing filler metal district must not exceed 20% of overlapping splice length.

(2) tension test, test method is with reference to ASME standard Ⅸ volume QB-150.

In order to the accuracy of guarantee test data, tensile sample both ends of the surface have carried out digging processing, make rotor bar position placed in the middle.The average tensile strength of soldered fitting is in table 6.

Mother metal	Average tensile strength (MPa)
		Red copper+red copper	207.2
Red copper+copper silicon	241.4

Table 6

But, those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.

Claims (2)

1. a novel squirrel-cage motor rotator sliver, is characterized in that, its Ingredient percent is: silicon 1.5%-1.7%, and surplus is copper and inevitable impurity.

2. a manufacture method for novel squirrel-cage motor rotator, is characterized in that, comprises the following steps:

Composition: the Ingredient percent of squirrel-cage motor rotator sliver is: silicon 1.5%-1.7%, surplus is copper and inevitable impurity;

Melting: silico briquette and cathode copper are put into middle frequency furnace melting by mentioned component;

Strand: by under draw the raw material liquation that melting produces by conticaster and cast copper silicon ingot circle base, liquation pouring temperature 1190 DEG C, draws note speed 800 turns/hour, cast hydraulic pressure 2Mpa;

Extrude semi-finished product: by extruder, copper silicon ingot circle base is extruded into sliver semi-finished product, extruder operating pressure 25Mpa, extruding heating-up temperature 870 DEG C, extrusion speed 0.2 m/min;

Pulling finished goods: sliver semi-finished product are drawn into sliver finished product by hydraulic drawbench, hydraulic drawbench operating pressure 12Mpa, drawing speed 10 ms/min.