CN1304831A

CN1304831A - Injection part for adhering and pressing magnetic body and injection technology

Info

Publication number: CN1304831A
Application number: CN 01105211
Authority: CN
Inventors: 曲东海
Original assignee: NINGBO YUNSHENG STRONG MAGNETIC MATERIAL CO Ltd
Current assignee: NINGBO YUNSHENG STRONG MAGNETIC MATERIAL CO Ltd
Priority date: 2001-01-11
Filing date: 2001-01-11
Publication date: 2001-07-25
Anticipated expiration: 2021-01-11
Also published as: CN1192867C

Abstract

An injection-moulded part for integrating magnet is made up through such steps as putting the magnet in the mould of shaper, pouring molten material in peripheral cavity and then in inner cavity, demoulding the injection-moulded part having protecting cover, and removing the protecting cover. Its advantages are omitting metal element, low cost and light weight. It can be used to make the rotor of motor.

Description

The moulding of adhering and pressing magnetic body and Shooting Technique

The present invention relates to a kind of moulding of magnet and make processing method, particularly a kind of magnet is pressed into by fast quenching neodymium iron boron NaFeB alloyed powder or general magnetic, and carry out the moulding and the Shooting Technique of the adhering and pressing magnetic body of injection moulding processing within it on the wall of chamber, with the magnet moulding that the method processing makes, be mainly used in and do the rotor use.

Original routine after magnet processing, carry out Shooting Technique; especially on the magnet internal chamber wall during injection moulding; for make magnet do not annotate broken, scrap, reduce the loss; need to become an annulus to make grommet with the nonferrous materials cut earlier; and becket is placed on to be glued in the magnet is integral; play protection magnet effect, will be injection molded into one and make with the magnet of becket and working of plastics more at last, as shown in Figure 1.

This processing method not only procedure is many, and the middle transition of being made by the nonferrous materials protection part that also need assist has increased product weight, has improved manufacturing cost again.

The object of the present invention is to provide a kind of moulding and Shooting Technique of adhering and pressing magnetic body, can simplify procedure, make simply, and can save a large amount of nonferrous materialss, the moulding that makes is in light weight can to reduce cost again.

The present invention is achieved in that the moulding and the Shooting Technique of adhering and pressing magnetic body, and the magnet that processing step a. will process is put into the mould of injection (mo(u)lding) machine; B. the cast gate of melting feed liquid on die edge injects mould, and feed liquid is at first filled with behind the injection molding cavity of magnet neighboring again through being distributed on the little cast gate on the magnet end face, fills with the injection molding cavity of magnet inner peripheral wall; C. demoulding, the magnet moulding that will have protective cover is taken out from mould, and protective cover is that an end is fixed on the sealing ring of magnet ends, in addition the equal cloth bar cage of end opening; D. remove the protective cover of outside, just obtain the moulding of magnet.

The integral body of moulding for connecting into by magnet and working of plastics, the boss and the groove that cooperate with working of plastics in addition on the both ends of the surface of described magnet.

Fig. 1. the structural representation (cutaway view) of prior art magnet moulding;

Fig. 2. have the structural representation of the magnet moulding of protective cover;

Fig. 3. the vertical view of Fig. 2;

Fig. 4. have the structural representation (cutaway view) of the magnet moulding of protective cover;

Fig. 5. the vertical view of Fig. 4;

Fig. 6. the structural representation of magnet moulding of the present invention (cutaway view);

Fig. 7. the vertical view of Fig. 6;

Fig. 8. the structural representation of magnet moulding of the present invention (cutaway view);

Fig. 9. the magnet structure schematic diagram;

Figure 10. the vertical view of Fig. 9;

Figure 11. the magnet structure schematic diagram;

Figure 12. the vertical view of Figure 11.

Below in conjunction with accompanying drawing embodiments of the invention are further described:

Magnet can be alloyed powder or the magnetic and the various difform rolled-up stock of various different components as required.

According to size and designing requirement and user's needs of motor, rotor axis of electric can, can not be injection molded into one with rotor yet.

Now the magnet moulding with the processing belt rotor axis of electric is an example, the Shooting Technique step:

A. the magnet that will process (1) is put into the mould of injection (mo(u)lding) machine.

B. the melting feed liquid in the injection (mo(u)lding) machine; cast gate on die edge injects mould; feed liquid is injected the injection molding cavity of the less magnet of resistance (1) neighboring at first from top to bottom; be injection molded into the protective cover (4) of being close to magnet (1); fill with the back feed liquid again through being distributed on three little cast gates (5) on the end face; fill with the injection molding cavity on magnet (1) inwall from top to bottom, and make working of plastics (3) and magnet (1) be injection molded into whole moulding.

C. the demoulding, the magnet moulding that will have protective cover (4) is taken out from mould, and protective cover (4) is that an end is fixed on the sealing ring of magnet (1) end, the equal cloth bar cage of other end opening.The bar pole length is identical with magnet (1) length, and the sealing ring external diameter is slightly larger than magnet (1) external diameter, is coated on the neighboring of magnet (1).

D. remove the outer protective cover (4) of magnet moulding, soon the tie point that three little cast gates (5) are located between protective cover (4) and working of plastics (3) is torn and is removed, and just obtains the magnet moulding, as Fig. 6, shown in Figure 8.

The processes step of magnet (8), (9) is same as described above not to be described in detail.Just rotor axis of electric is not injection molded into one with rotor.

Suppress symmetry and

uniform

3 or 4 boss and 3 or 4 arc grooves (6), (10) on the both ends of the surface of magnet (1), (8), (9) respectively, shown in Fig. 9,10,11,12.Make after the injection moulding between itself and working of plastics (3), (7) and work in coordination, axial endplay can not take place, can transmit after the injection moulding simultaneously and can not produce slide relative than high pulling torque.

The present invention is compared with prior art: because having adopted the processing technology of magnet and the direct injection mo(u)lding of working of plastics, And at first pour into a mould formation one protective cover at the outer surface of magnet, and then carry out the injection moulding of magnet inner chamber, thereby have When protective cover protection magnet carries out the inner chamber injection moulding, can not crack with cracked, reduce scrappage. Add simultaneously The worker is simple, operation is few, removed original non-ferrous metals processing operation and with the bonding all-in-one-piece of magnet bonding Operation has saved the middle auxiliary component that non-ferrous metal is made into, and has therefore reduced cost, has reduced product Weight is beneficial to batch production. The magnet both ends of the surface have boss and groove and working of plastics tight fit, its moulding structure Firm.

Claims

1. the Shooting Technique of an adhering and pressing magnetic body is characterized in that: processing step

A. the magnet that will process is put into the mould of injection (mo(u)lding) machine;

B. the cast gate of melting feed liquid on die edge injects mould, and feed liquid is at first filled with behind the injection molding cavity of magnet neighboring again through being distributed on the little cast gate on the magnet end face, fills with the injection molding cavity of magnet inner peripheral wall;

C. demoulding, the magnet moulding that will have protective cover is taken out from mould, and protective cover is that an end is fixed on the sealing ring of magnet ends, in addition the equal cloth bar cage of end opening;

D. remove the protective cover of outside, just obtain the moulding of magnet.

2. Shooting Technique according to claim 1 is characterized in that: processing step

A. put in the mould of people's injection (mo(u)lding) machine the magnet that will process (1) or (8) or (9);

B. the melting feed liquid in the injection (mo(u)lding) machine, cast gate on die edge injects mould, feed liquid is injected the injection molding cavity of the less magnet of resistance (1) or (8) or (9) neighboring at first from top to bottom, be injection molded into the protective cover (4) of being close to magnet (1) or (8) or (9), fill with the back feed liquid again through being distributed on three little cast gates (5) on the end face, fill with the injection molding cavity on magnet (1) or (8) or (9) inwall from top to bottom, and make working of plastics (3) or (7) be injection molded into whole moulding with magnet (1) or (8) or (9);

C. the demoulding, the magnet (1) or (8) or (9) moulding that will have protective cover (4) are taken out from mould, protective cover (4) is that an end is fixed on the sealing ring of magnet (1) end, the equal cloth bar cage of other end opening, the bar pole length is identical with magnet (1) length, and the sealing ring external diameter is slightly larger than magnet (1) external diameter, is coated on the neighboring of magnet (1);

D. remove the outer protective cover (4) of magnet moulding, soon the tie point that three little cast gates (5) are located between protective cover (4) and working of plastics (3) or (7) is torn and is removed, and just obtains the magnet moulding.

3. the moulding of an adhering and pressing magnetic body, moulding be is characterized in that by the integral body that magnet and working of plastics connect into: the boss and the groove that cooperate with working of plastics in addition on the both ends of the surface of magnet.

4. moulding according to claim 3 is characterized in that: suppress symmetry and uniform 3 or 4 boss and 3 or 4 arc grooves (6), (10) on the both ends of the surface of magnet (1), (8), (9) respectively.