CN105356683A - Processing method for aluminum casting rotor of motor - Google Patents

Abstract

The invention provides a processing method for an aluminum casting rotor of a motor. The processing method comprises the following steps of firstly, placing a stacked rotor core in a baking oven for baking to remove stamping oil, wherein the temperature of the oven is controlled to be 170-180 DEG C, and the process is controlled to last for 30-40 minutes; secondly, carrying out stress relief annealing on the rotor core with oil removedstrictly controlling oxidizing gas content in the oven and cooling the rotor core with the oven and taking the rotor core out of the oven until the temperature is below 300 DEG C, wherein the annealing temperature is controlled to be 700-750 DEG C, and the cooling speed is smaller than 30 DEG C per hour; thirdly, carrying out pressure aluminum casting on the rotor core subjected to stress relief annealing; and finally putting the aluminum casting rotor after die casting into transformer oil with a temperature of 10 to 20 DEG C for cooling, taking the aluminum casting rotor out after standing for 20 minutes, and washing to remove the transformer oil remained on the aluminum casting rotor after the rotor is taken out. With the adoption of the processing method, additional loss and iron loss of the aluminum casting rotor can be reduced, and the efficiency of the motor is improved.

Description

A kind of processing method of motor cast-aluminum rotor

Technical field

The invention belongs to cast-aluminum rotor field, particularly relate to a kind of processing method of motor cast-aluminum rotor.

background technology:

Existing asynchronous motor mouse cage cast aluminium rotor generally adopts pressure cast aluminium die to carry out the mode of cast aluminium, and this cast aluminium mode rotor core not preheating before die casting, does not eliminate rotor core machining stress.Its operating procedure is simple, and because pressure in pressure cast aluminium process is very large, aluminium water can be close to cell wall along rotor, even enters between silicon steel sheet, increases the leakage of current between cast-aluminum rotor sliver, the supplementary load loss of rotor is increased, especially stray loss.Not eliminating rotor core machining stress causes magnetic to worsen iron loss increase.

summary of the invention:

The object of the invention is to overcome above-mentioned weak point of the prior art and the treatment process that a kind of asynchronous motor mouse cage cast aluminium rotor of constant product quality is provided.

Cast-aluminum rotor processing method provided by the invention, is characterized in that following flow process:

A), the rotor core laminated is placed in baking box toasts, to remove punching oil, Control for Kiln Temperature is at 170-180 DEG C, and the time is at 30-40 minute;

B), by rotor core complete for oil removing carry out stress relief annealing, annealing temperature controls at 700-750 DEG C, strictly will control stove internal oxidition gas content, cools to less than 300 DEG C with the furnace and comes out of the stove, cooling rate be less than 30 DEG C per hour;

C), pressure cast aluminium is carried out in rotor core complete for stress relief annealing;

D), die casting is completed after cast-aluminum rotor to drop into temperature be cool in the transformer oil of 10-20 DEG C, leave standstill after 20 minutes and take out, take out transformer oil residual on afterwash cast-aluminum rotor.

The invention has the advantages that baking rotor core can remove punching oil, when preventing stress relief annealing, rotor core generation carburizing, worsens magnetic property.Stress relief annealing is eliminated rotor core and is eaten up part of the stress produced in the course of processing, the magnetic property of restorer, reduces iron loss.Define tiny gap between the iron core cell wall of cast-aluminum rotor, reduce the leakage of current of cast-aluminum rotor sliver, reduce the supplementary load loss of cast-aluminum rotor, improve motor efficiency.

embodiment:

Cast-aluminum rotor processing method, is characterized in that following flow process:

A), the rotor core laminated is placed in baking box toasts, to remove punching oil, Control for Kiln Temperature is at 170-180 DEG C, and the time is at 30-40 minute;

B), by rotor core complete for oil removing carry out stress relief annealing, annealing temperature controls at 700-750 DEG C, strictly will control stove internal oxidition gas content, cools to less than 300 DEG C with the furnace and comes out of the stove, cooling rate be less than 30 DEG C per hour;

C), pressure cast aluminium is carried out in rotor core complete for stress relief annealing;

D), die casting is completed after cast-aluminum rotor to drop into temperature be cool in the transformer oil of 10-20 DEG C, leave standstill after 20 minutes and take out, take out transformer oil residual on afterwash cast-aluminum rotor.

It is in the transformer oil of 10-20 DEG C that cast-aluminum rotor after die casting completes drops into temperature at once, and the reason owing to expanding with heat and contract with cold between cast-aluminum rotor sliver and cell wall can produce tiny gap, more effective reinforced insulation.

Claims (1)

1. a processing method for motor cast-aluminum rotor, is characterized in that following flow process:

A), the rotor core laminated is placed in baking box toasts, to remove punching oil, Control for Kiln Temperature is at 170-180 DEG C, and the time is at 30-40 minute;

B), by rotor core complete for oil removing carry out stress relief annealing, annealing temperature controls at 700-750 DEG C, strictly will control stove internal oxidition gas content, cools to less than 300 DEG C with the furnace and comes out of the stove, cooling rate be less than 30 DEG C per hour;

C), pressure cast aluminium is carried out in rotor core complete for stress relief annealing;

D), die casting is completed after cast-aluminum rotor to drop into temperature be cool in the transformer oil of 10-20 DEG C, leave standstill after 20 minutes and take out, take out transformer oil residual on afterwash cast-aluminum rotor.