CN103457419A - Guidance design of motor cold pressing rotating shaft - Google Patents

Abstract

The invention provides a guidance design of a motor cold pressing rotating shaft. The guidance design includes the step that when the rotating shaft is installed in a cold pressing mode, a guidance structure with the automatic alignment and locating function is designed on the rotating shaft on the premise that the mechanical strength and the structure functions of the rotating shaft are not affected. The guidance design is characterized in that the dimension of the guidance starting end of the rotating shaft is about 2-3-mm smaller than the shaft hole fit dimension, the dimension of the guidance tail end is in smooth transition to the shaft hole fit dimension, the guidance angle is 2 degrees, and the relation of the guidance length L1 and the effective length L2 of a shaftless cast-aluminum rotor shaft hole is that L1:L2 is about equal to 1:4. By the utilization of the guidance design, through the reasonable guidance angle and the guidance length, the rotating shaft is conveniently automatically aligned and located, and therefore working efficiency is improved; the guidance tail end is in smooth transition to the shaft hole fit dimension, burrs inside the shaftless cast-aluminum rotor shaft hole can not be scraped, and then first-pass yield of products is improved; the guidance structure of the rotating shaft is obtained without increasing machining cost.

Description

The cold pressing navigation designing of rotating shaft of motor

Technical field

The present invention relates to design, processing and the assembling field of threephase asynchronous rotating shaft, be specially adapted to the process of rotating shaft cold-pressing assembly to shaftless cast-aluminum rotor.

Background technology

For convenience of describing, take YX3-90 as example.The rotor of motor (seeing Fig. 3) generally comprises rotating shaft (seeing Fig. 4) and shaftless cast-aluminum rotor (seeing Fig. 5), shaftless cast-aluminum rotor through the silicon steel sheet stamping-out, laminate and the manufacture of cast aluminium operation forms.The cylindrical of rotating shaft and the axis hole of shaftless cast-aluminum rotor are interference fit, and (tolerance fit is

).The method that rotating shaft is assembled to shaftless cast-aluminum rotor mainly contains hot jacket assembling method (abbreviation hot jacket) and the rotating shaft assembling method of colding pressing (abbreviation cold pressing axle).The hot jacket assembling method refers to the principle that utilization is expanded with heat and contract with cold, and by shaftless cast-aluminum rotor heating, shaft hole diameter strengthens, and then rotating shaft is penetrated to the method for assembling.The rotating shaft assembling method of colding pressing refers to and with forcing press, rotating shaft is pressed into to the assembly method of shaftless cast-aluminum rotor." hot jacket " and " axle of colding pressing " compares, and because latter's energy consumption is less, is widely used.

" axle of colding pressing " generally has following steps: first by shaftless cast-aluminum rotor axis hole upward → be put on the workbench of forcing press → insert rotating shaft (now, the axis of rotating shaft and shaftless cast-aluminum rotor axis hole is decentraction) → motor press, first align gently the axis of rotating shaft and shaftless cast-aluminum rotor axis hole, i.e. " axis is concentric " → start forcing press, be press-fit into place.In " axle of colding pressing " process, first align the axis of rotating shaft and shaftless cast-aluminum rotor axis hole, be one of important step guaranteed product quality.

As seen from Figure 4, the chamfering of rotating shaft is less, between rotating shaft mating surface and non-mating surface, less step is arranged.As seen from Figure 5, the axis hole of shaftless cast-aluminum rotor does not have chamfering.Because the cylindrical of rotating shaft and the axis hole of shaftless cast-aluminum rotor are interference fit, at the beginning of process of assembling is colded pressing in rotating shaft, the step in rotating shaft is easy to sweep the burr in shaftless cast-aluminum rotor axis hole.Along with deepening continuously of press-fiting, final result generally has following several situation:

1) burr can be stronger and stronger, the pressure of forcing press with press-fit resistance balance, rotating shaft occurs significantly crooked, becomes waste product.

2) at other end axis hole, the silicon steel sheet turnup of shaftless cast-aluminum rotor is deposited in rotating shaft, and generally " turned welt " or " pressure is collapsed ", become serious defective item.

3) unconspicuous bending occurs in rotating shaft, becomes defective item.

The fault easily caused has: a) rotor dynamic balancing difficulty; B) during overall test, the stator inner circle is wiped mutually with rotor outer circle, and rotor " is swept thorax "; When c) the complete machine dimensional accuracy detects, shaft extension is beated and is exceeded standard.

4) rotating shaft sweeps a small amount of burr, and there is obvious scoring trace on the rotating shaft surface, affects apparent mass, is defective item.

5) rotating shaft sweeps the seldom burr of amount, and there is slight scoring trace on the rotating shaft surface, does not affect use, is inferior qualified product.

6) grain raising is not scraped in rotating shaft, and rotor has concentricity and apparent mass preferably, is first-class qualified product.

According to incompletely statistics, rear two qualified product only account for 75% left and right of product sum.That is to say, the first-time qualification rate of product is 75% left and right only.Motor is as a kind of general electronic product, and output is very large.If will further improve the first-time qualification rate of product, only depend on operator's the consummate degree of quality mind, operative skill and operation, be obviously far from being enough.

For this reason, under the prerequisite of the mechanical strength that does not affect rotating shaft and structure function, we design the guide frame of having processed the automatic adjustment location in rotating shaft.Through improvement, practice and checking repeatedly, determined guiding angle and guiding length, guaranteed " axle of colding pressing " product quality, the first-time qualification rate of product has reached 99% (first-class qualified product), has improved efficiency, has obtained useful effect.

Summary of the invention

The cold pressing navigation designing of rotating shaft of motor, refer in process of assembling is colded pressing in rotating shaft, under the prerequisite of the mechanical strength that does not affect rotating shaft and structure function, designed the guide frame of automatic adjustment location in rotating shaft, it is characterized in that: rotating shaft guiding top is less than approximately 2～3mm of shaft hole matching size, guiding tail end smooth transition is to the shaft hole matching size, and the guiding angle is 2 °, and guiding length L 1 with the relation of shaftless cast-aluminum rotor axis hole effective length L2 is

The invention has the beneficial effects as follows:

1) design of rotating shaft guiding, at first take does not affect the mechanical strength of rotating shaft and structure function is prerequisite.

2) reasonably lead angle and guiding length, be convenient to realize the automatic adjustment location of rotating shaft omitted " aligning " step in artificial and equipment operating process, saved the unnecessary operating time, improved operating efficiency.

3) guiding tail end smooth transition, to the shaft hole matching size, can not sweep the burr in shaftless cast-aluminum rotor axis hole again, has improved " axle of colding pressing " product quality, and the first-time qualification rate of product has reached 99%.

4) realization of rotating shaft guide frame, do not increase machining cost, in the programming of numerically controlled lathe, by the Excircle machining programing change of this position, is just that the tapering procedure gets final product, simple to operation.

The accompanying drawing explanation

After Fig. 1 is application the present invention, i.e. the schematic diagram after guiding has been processed in rotating shaft.

After Fig. 2 is application the present invention, i.e. after guiding has been processed in rotating shaft, the rotor installation diagram.

Before Fig. 3 is application the present invention, YX3-90 rotor installation diagram.

Before Fig. 4 is application the present invention, YX3-90 rotating shaft figure.

Fig. 5 and Fig. 6 are respectively the shaftless cast-aluminum rotor front view of YX3-90 and end view.

Embodiment

1. layout design:

In rotating shaft, the shaping-orientation structure, rotating shaft guiding top is less than approximately 2～3mm of shaft hole matching size, and guiding tail end smooth transition is to the shaft hole matching size, and the guiding angle is 2 °, and guiding length L 1 with the relation of shaftless cast-aluminum rotor axis hole effective length L2 is $\frac{L1}{L2}\≈\frac{1}{4},$ See Fig. 1.

2 machinings: input tapering procedure in the programming of numerically controlled lathe, processing puts in place, sees Fig. 1.

3 cold-pressing assemblies:

3.1 first by the axis hole of shaftless cast-aluminum rotor (Fig. 5) upward, be put on the workbench of forcing press.

3.2 have an end of guiding to insert the endoporus of shaftless cast-aluminum rotor rotating shaft, the axis of rotating shaft and shaftless cast-aluminum rotor is automatic adjustment under the effect of guiding, keeps axis unified.

3.3 the other end in rotating shaft is put auxiliary mould.

3.4 start forcing press, rotating shaft be press-fit into place.

3.5 the apparent mass of the concentricity of detection rotor, range estimation rotor.

At present, my company average is the about dress of colding pressing of 1.5 ten thousand rotors per month, has all adopted the rotating shaft with guide frame, and operating efficiency is very high, has created considerable economic benefit.

Claims (1)

1. the motor navigation designing of rotating shaft of colding pressing, refer in process of assembling is colded pressing in rotating shaft, under the prerequisite of the mechanical strength that does not affect rotating shaft and structure function, designed the guide frame of automatic adjustment location in rotating shaft, it is characterized in that: the guiding top of rotating shaft is less than approximately 2～3mm of shaft hole matching size, guiding tail end smooth transition is to the shaft hole matching size, and the guiding angle is 2 °, and guiding length L 1 with the relation of shaftless cast-aluminum rotor axis hole effective length L2 is

.

Images