CN102029392A

CN102029392A - Punch die for powder compacting, powder compacting device provided with punch die, and forming method with device

Info

Publication number: CN102029392A
Application number: CN2010102544007A
Authority: CN
Inventors: 床井博洋; 小林金也
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2009-09-30
Filing date: 2010-08-12
Publication date: 2011-04-27
Also published as: JP2011073028A; US20110076175A1

Abstract

In a punch die for powder compacting, a powder compacting device provided with the punch die, and a forming method with the device, for suppressing the occurrence of stress concentration in the die without changing a shape of a powder compacting body, the punch die (300) is used to form a cylindrical member by powder compacting, which has a substantially cylindrical shape and has a protrusion portion formed on the inner peripheral side thereof to protrude in the axial direction or a stepped portion or a concave portion formed on the inner peripheral side thereof in the radial direction. The punch die (300) has a substantially cylindrical shape, and has a protrusion portion (330) formed on at least a part of the inner peripheral surface or the outer peripheral surface thereof to protrude toward the center axis. The punch die is divided into upper and lower two parts at a surface forming the same surface as a lower surface of the protrusion portion, and the division surfaces are mechanically connected to each other or adhered to each other by adhesive.

Description

Be shaped with punch die, possess building mortion and the manufacturing process of this shaping with punch die

Technical field

The present invention relates to be used for to be manufactured on interior all sides of tubular structure or outer circumferential side by powder extrusion forming has in the shaping of the cartridge of axially outstanding protuberance with punch die, the building mortion that possesses this punch die and manufacturing process.

Background technology

Used use in the motor core etc. of powder extruding core material at the powder extrusion forming body that interior all sides or outer circumferential side have a protuberance.For example, in the motor core, use at the three-dimensional body that circumferentially has raised structures discretely in the interior perimembranous of ring structure.The density of this formed body is big more, helps the raising of motor output, the raising of motor torque more.The electric rotating machine that forms stator core by compression magnetic powder is disclosed in patent documentation 1.

Patent documentation 1: TOHKEMY 2007-124884 communique

Fig. 2 (a) is the stereogram of the powder extrusion forming body 200 that passes through the tubular that powder extrusion forming is shaped shown in the patent documentation 1, and Fig. 2 (b) is the amplification stereogram of inner peripheral surface side that amplifies the A portion of presentation graphs 2 (a).The powder extrusion forming body 200 of tubular has round or body cylindraceous 210, has at the outer surface of the jut 210 of axially outstanding protuberance 220 or radial direction, step difference or the depressed part between the inner surface in interior all sides of body 210.

Below explanation is used to make the conventional example of mould structure, building mortion and manufacturing process of the powder extrusion forming body 200 of above-mentioned tubular.

Fig. 4 represents to be used for the shaping of powder extrusion forming body 200 of shop drawings 2 with the shape of the upper punch 400 of punch die, and Fig. 4 (a) is that the top sees that the stereogram of upper punch 400, Fig. 4 (b) are that the stereogram of upper punch 400 is seen in the below from the side from the side.Upper punch 400 constitutes at the outstanding protuberance 420 of radial direction by ring portion 410 with in interior all sides of ring portion 410.By ring portion upper surface 211 pressurizations of the 411 pairs of formed bodies in bottom surface of ring portion 410, by protuberance upper surface 221 pressurizations of 421 pairs of formed bodies of lower surface of protuberance 420.

Figure 12 is the formation of the powder extrusion forming device 1200 that possesses upper punch represented with the B-B section of Fig. 4 (a) of expression and the major part profile of manufacturing process.Powder extrusion forming device 1200 is made of the mould 1220 of the core 1210 of interior perimembranous, peripheral part and the upper punch 1230 of exerting pressure from top pushing powder 1201, the low punch 1240 of exerting pressure from below pushing powder.By upper punch 1230 and low punch 1240 are relatively moved, form powder extrusion forming body 1202.

In the above-described configuration, this situation of generation crackle becomes problem in that the bight of upper punch 400 430 generation stress are concentrated.When powder extrusion forming, have by the forcing press applied pressure in protuberance lower surface 421 effect of upper punch 400, have because of powder in ring portion inner peripheral surface 412 effects of upper punch 400 to carry over the side pressure that fragmentation produces.Thus, 430 produced to hale and stretched stress in the bight.For this reason, in the past, 430 were provided with curved surface and concentrated to relax stress in the bight.On the other hand, as shown in Figure 2, also form same curved surface at this place of formed body 200.Like this, for existing method, be provided with unnecessary curved surface at formed body, system has been limit the design freedom of formed body.For example, when the motor core that formed body is used for shown in the patent documentation 1,, there is degradation under motor output or the motor torque to can not get the situation of abundant characteristic because the iron amount of jut reduces.

Summary of the invention

Therefore, punch die structure, building mortion and the manufacturing process concentrated of the problem of the present invention stress that is to provide a kind of shape that does not change over body just can suppress mould.

In order to reach above-mentioned problem, the present invention is a kind of shaping punch die, this shaping is used for the powder extrusion forming cartridge with punch die, this cartridge has roughly barrel shape, and have at the axially outstanding protuberance or the step difference or the depressed part of radial direction in interior all sides or outer circumferential side, it is characterized in that, described shaping has roughly barrel shape with punch die, and at least a portion at inner peripheral surface or outer peripheral face has at the outstanding protuberance of center position, with the same one side of the lower surface of this protuberance on be divided into two parts up and down, the face of cutting apart mechanically tightens together each other or is bonded together by bonding agent.

And then, the present invention is being shaped with in the punch die, it is characterized in that the described punch die of being cut apart up and down forms recess and forms protuberance ground at another drift and embed and tighten together by bolted, screw threads for fastening or at a drift at described divisional plane each other.

And then the present invention is characterized in that being shaped with in the punch die, is divided into up and down accordingly in the two-part drift in the shape with the cartridge of powder extrusion forming, and the drift of bottom can be changed.

And then, the present invention uses in the punch die in above-mentioned shaping, it is characterized in that, as the bight of the linking part of the inner peripheral surface of the drift of the lower surface of described protuberance and described bottom, be the structure that corner angle are arranged of non-curved-surface structure or be made as R and the width of the radial direction of described protuberance is made as in radius of curvature and satisfy the structure of R/ δ＜0.2mm under the situation of δ or any at least in the structure of R＜0.2mm when the radius of curvature with described bight is made as R described bight.

In addition, the present invention is a kind of building mortion of cartridge, it is characterized in that, use punch die as upper trimming die above-mentioned shaping, punch die under axially disposing opposite to each other with described upper trimming die is at the outside configuration mould of described upper trimming die and described punch die down, at the inboard configuration core of described upper trimming die and described punch die down, by described upper punch and described low punch are relatively moved, the powder that is filled between described upper trimming die and the described following punch die is formed.

And then, the invention is characterized in, use described shaping punch die, described down punch die with Zhou Chongtou and periphery drift in the roughly corresponding diameter of the external diameter of the protuberance of described cartridge is divided into, by making described upper punch and described interior Zhou Chongtou and the described periphery drift powder that is shaped that relatively moves.

In addition, in order to reach above-mentioned problem, the present invention is a kind of manufacturing process of cartridge, it is characterized in that, punch die under axial and upper punch dispose opposite to each other, this upper punch has at the outstanding protuberance of center position at least a portion of inner peripheral surface, and with the same one side of the lower surface of this protuberance on be divided into two parts up and down, the face of cutting apart mechanically tightens together each other or is bonded together by bonding agent, outside configuration mould at described upper trimming die and described punch die down, inboard configuration core at described upper trimming die and described punch die down, by described upper punch and described low punch are relatively moved, the powder that is filled between described upper trimming die and the described down punch die is carried out powder extrusion forming, make barrel shape roughly and have the cartridge of the powder extrusion forming of step difference or depression in interior all sides.

And then, the present invention is in the manufacturing process of cartridge, it is characterized in that the described punch die of cutting apart up and down forms recess by bolted, screw threads for fastening or on a drift and forms protuberance ground at another drift and embed and tighten together at described divisional plane each other.

And then the present invention is characterized in that in the manufacturing process of cartridge, is divided into up and down accordingly in the two-part drift in the shape with the cartridge of powder extrusion forming, and the drift of bottom can be changed.

And then, the present invention is in the manufacturing process of cartridge, it is characterized in that, as the bight of the linking part of the inner peripheral surface of the drift of the lower surface of described protuberance and described bottom, be the structure that corner angle are arranged of non-curved-surface structure or be made as R and the width of the radial direction of described protuberance is made as in radius of curvature and satisfy the structure of R/ δ＜0.2mm under the situation of δ or any at least in the structure of R＜0.2mm when the radius of curvature with described bight is made as R described bight.

And then, the present invention is a kind of building mortion of cartridge, it is characterized in that, the punch die of manufacturing process that will be used for above-mentioned cartridge is as upper trimming die, punch die under axially disposing opposite to each other with described upper trimming die is at the outside configuration mould of described upper trimming die and described punch die down, at the inboard configuration core of described upper trimming die and described punch die down, by described upper punch and described low punch are relatively moved, the powder that is filled between described upper trimming die and the described following punch die is formed.

And then, the present invention is in the building mortion of cartridge, it is characterized in that, described down punch die with Zhou Chongtou and periphery drift in the roughly corresponding diameter of the external diameter of the protuberance of described cartridge is divided into, by making described upper punch and described interior Zhou Chongtou and the described periphery drift powder that is shaped that relatively moves.

Punch die of the present invention is because be slit into two parts with ledge, so according to following reason, be difficult to take place in the bight damaged.

1) since the inner peripheral surface of the lower surface of the protuberance of punch die and cylindrical portion on material, do not have integrated, so the not stress addition of this lower surface and inner peripheral surface in the bight.

2) though strong load vertically is applied to the protuberance of punch die, by by with the same plane formation of cutting apart and linking of the lower surface of the protuberance of punch die, the tensile stress of protuberance weakens.

3) owing to punch die being separated, so the development of crackle can not occur at protuberance.

Therefore, can reduce as the protuberance lower surface of punch die with the stress in the bight of the linking part of the cylindrical portion inner peripheral surface of its binding and concentrate.

Description of drawings

Fig. 1 (a) is the stereogram of expression with the powder extrusion forming body of the powder extrusion forming device manufacturing of first embodiment, (b) is the amplification stereogram that amplifies the outer peripheral face side of the F portion that represents (a) figure.

Fig. 2 (a) is the stereogram of expression with the powder extrusion forming body of existing powder extrusion forming device manufacturing, is the amplification stereogram that amplifies the outer peripheral face side of the A portion that represents (a) figure (b).

Fig. 3 is the figure of formation of punch die of the mode of expression embodiment 1, (a) is the stereogram of the punch die that tightens together of upper punch and bottom drift, (b) is the stereogram of the punch die of the state that separates with the bottom drift of upper punch.

Fig. 4 is the figure of shape of the existing punch die of expression, (a) is that the stereogram of punch die is seen in the top from the side, (b) is that the stereogram of punch die is seen in the below from the side.

Fig. 5 is the major part section pie graph of the powder extrusion forming device that possesses the top punch die represented of the C-C section with Fig. 3 of embodiment 2.

Fig. 6 represents conventional example.

Fig. 7 is the major part section pie graph of the powder extrusion forming device of embodiment 4.

Fig. 8 (a) is the stereogram of expression with the powder extrusion forming body of the powder extrusion forming device manufacturing of the 3rd embodiment, (b) is the amplification stereogram that amplifies the outer peripheral face side of the I portion that represents (a) figure.

Fig. 9 represents the formation of the punch die of embodiment 3, (a) is the stereogram of the punch die that tightens together of upper punch and bottom drift, (b) is the stereogram of the punch die of the state that separates with the bottom drift of upper punch.

Figure 10 is the stereogram of expression with the powder extrusion forming body of the powder extrusion forming device manufacturing of embodiment 4.

Figure 11 is the major part section pie graph of the powder extrusion forming device that possesses the top punch die represented of the C-C section with Fig. 3 of embodiment 1.

Figure 12 is the major part section pie graph of the powder extrusion forming device that possesses the top punch die represented of the B-B section with Fig. 4 of existing punch die.

Figure 13 is the major part section pie graph of the powder extrusion forming device of embodiment 5.

Figure 14 is the stereogram of the example of the expression stator that the powder extrusion forming body that is shaped by the powder extrusion forming device of embodiment 4 is applicable to motor.

Description of reference numerals

100,200,502,702,800,1000,1410,1102,1202,1302... powder extrusion forming body (formed body), 110,210,810,1010... body, 120,220,820,1020,1303... jut, 121,221,821,1022... jut upper surface, 122,222,822,1021... jut outer peripheral face, 123,223,823,1023... the bight that constitutes by jut upper surface and jut outer peripheral face, 300,400,900,1330... punch die, 310,732,910,1332... top drift, 320,733,920,1333... bottom drift, 321,412... the inner peripheral surface of ring portion, 330,420... protuberance, 331,421,931... the lower surface of protuberance, 340,430,731,1331... bight, 411... ring portion lower surface, 500,700,1100,1200,1300... powder extrusion forming device (building mortion), 501,701,1101,1201... powder, 510,710,1110,1210... core, 520,720,1120,1220... mould, 530,730,1130,1230... upper punch, 540,740,1340... following outer circumferential side drift, 541... following outer circumferential side drift upper surface, 550,750,1350... all side blow heads down, 551... all side blow heads upper surface down, 824... the tapering of projection upper surface, 825... the tapering of projection outer peripheral face, 1140,1240... low punch, 1420... loop coil, R... radius of curvature (radius of curvature in bight), δ ... the width dimensions of the front end face of jut.

The specific embodiment

Below, with reference to accompanying drawing embodiments of the present invention are described.

[embodiment 1]

Fig. 3 represents the formation of the punch die 300 of embodiment 1, and Fig. 3 (a) is the stereogram of the punch die 300 that links of top drift 310 and bottom drift 320, and Fig. 3 (b) is the stereogram of the punch die 300 of the state that separates with bottom drift 320 of top drift 310.

Shown in Fig. 3 (a), the punch die of first embodiment is be shaped the mould of shape of body, protuberance of formed body, is roughly cylindric, is circumferentially forming three protuberances 320 at the inner peripheral surface of upside to center position.

Punch die 300 shown in Fig. 3 (b), with the same one side of the lower surface of protuberance 320 in be divided into two parts up and down, be separated into top drift 310 and bottom drift 320 ground and constitute, the divisional plane of punch die and protuberance lower surface are with simultaneously.

At this divisional plane, with the fastening low punch of going up of alienable method of attachment, for example, nut (not shown) is installed on the top drift corresponding with it by construction bolt (not shown) on the drift of bottom, can be with bolted and powerful the connection gone up low punch each other.

Up and down the fastening method of core is not limited to bolted, also can form protuberance the opposing party at a square one-tenth recess of the divisional plane of last low punch, by chimeric and be pressed into this jog etc. and make top drift and bottom drift combination.

In addition, the binding of last low punch also can also can be adopted screw threads for fastening in addition with combinations such as bonding agents.

As mentioned above, the divisional plane of the tabular surface that punch die constitutes at the upper surface by the lower surface of top drift and bottom drift engages the top drift with the bottom drift.

For this reason, the bight (not shown) that is formed by the lower surface 331 and the inner peripheral surface 321 of the protuberance that forms the punch die step difference can form non-curved-surface structure, and for example the shape that corner angle are arranged by vertical plane etc. forms.

Figure 11 possesses the punch die represented with the C-C ' section of Fig. 3 major part section pie graph as the powder extrusion forming device 1100 of upper punch 1130, Figure 11 (a) expression constitutes the device before the powder extrusion forming that upper punch risen, and Figure 11 (b) expression descends upper punch 1130 and the descend device that just carries out after the powder extrusion forming and take out before the powder extrusion forming body 1102 of ground pushing powders 1101 and shaping powder delivery end extruded body 1102 of low punch 1140 is constituted.

In Figure 11 (a) and (b), the left side of center line D is the formation picture of device that the punch die part of protuberance is arranged, and the right side of center line D is the formation picture of device that does not have the punch die part of protuberance.

Shown in Figure 11 (a), powder extrusion forming device 1100, the configuration of the outer peripheral face Outboard Sections of core 1110 from below apply the low punch 1140 of pushing force, and then at the outer peripheral face Outboard Sections of this low punch 1140 configuration mould 1120, above the space E that is formed by this mould 1120, core 1110 and low punch 1140, configuration applies the upper punch 1130 of pushing force from the top.

Shown in Figure 11 (a), in the powder extrusion forming device 1100 of this formation, in the space E that forms by mould 1120, core 1110 and low punch 1140, fill powder 1101, shown in the white arrow of Figure 11 (b), make upper punch 1130 apply load from the top to powder 1101 with descending, and, low punch 1140 is descended so that also powder 1101 is applied load from the below.As mentioned above, pushed by mould 1120, core 1110,

low punch

1140 and 1130 pairs of powders 1101 of upper punch and to be shaped, extruded body 1102 makes powder.

In addition, use powder extruding core material as powder, powder extrusion forming device by forcing press applies load, so that the powder that makes the global density of powder extrusion forming body become the formation powder pushes more than 92% of real density of magnetic material, produce the powder extrusion forming body of structure shown in Figure 1.

In addition, the stereogram of Fig. 1 (a) powder extrusion forming body 100 that to be expression make with powder extrusion forming device 1100, Fig. 1 (b) are the amplification stereograms of circumferential lateral surface side that amplifies the F portion of the powder extrusion forming body 100 shown in the presentation graphs 1 (a).

As Fig. 1 and shown in Figure 11, by using powder extrusion forming device 1100, the upper surface at the body 110 of cyclic structure is formed in the powder extrusion forming body 100 that circumferentially has three juts 120.

Powder extrusion forming body 100 has roughly barrel shape, and has at axially outstanding jut 120 in interior all sides, or the step difference of radial direction or depressed part, promptly forms the step difference or the depressed part of the radial direction of jut 120.

In addition, in above-mentioned punch die shown in Figure 4 400, when being shaped, 430 stress occurs and concentrate and crack in the bight, and punch die is damaged at short notice.

Because the real density of the powder of powder extrusion forming body is high more, the load that is applied on the punch die is just big more, so the lifetime of punch die.

Relative therewith, in embodiment 1, as shown in Figure 3, punch die 300 is two to be divided into top drift 310 and bottom drift 320 and fastening formation up and down with the same one side of the lower surface of protuberance, thereby, the angle (not shown) that the lower surface 331 and the inner peripheral surface 321 by protuberance of punch die 300 forms, because form by top drift 310 that separates and bottom drift 320, do not concentrate so can not cause stress, prevent from punch die 300 is applied excessive stress, breakage can not take place.

In addition, in the present embodiment, powder extrusion forming body 100 shown in Figure 1 can be set as the radius of curvature 123 of the linking part of the front end face 121 of jut 120 and outer peripheral face 122 roughly zero.

On the other hand, under the situation of above-mentioned Fig. 2, because the bight 223 of the powder extrusion forming body 200 shown in Fig. 2 (b) is curved-surface structures, the area of the flat site of front end face 221 diminishes.

Like this, when the flatness of the front end face of the jut that has improved the powder extrusion forming body, can receive following effect.

1) under the overlapping situation of the front end face of the jut that makes the powder formed body, the front end face of jut is smooth, then further improves and is close to power.

2) the whole end face that is made of the front end face of powder extrusion forming body is smooth, for the equipment that breadth is thin, width dimensions is little, is desirable forming on the slim this point then.

3) under the situation of the shaping that is applicable to the motor core that used powder extruding core material etc., because avoided unnecessary curve form, make the iron amount increase, so motor output or motor torque become big by same volume.

In addition, as shown in Figure 1, in the above embodiments 1, the quantity of having represented the jut of powder extrusion forming body is three situation, but the situation beyond three also has same effect.

[embodiment 2]

Utilize Fig. 5 that second embodiment is described.Fig. 5 is the major part profile of formation of the powder extrusion forming device 500 of expression second embodiment.Fig. 5 (a) expression constitutes the device before the powder extrusion forming that upper punch 530 rises, Fig. 5 (b) expression upper punch 530 is descended and make down outer circumferential side drift 540 and down in descend ground pushing powders 501 and after the powder extruded body 502 that just has been shaped and the device formation of powder extrusion forming body 502 before taking out of all side blow heads 550.

Shown in Fig. 5 (a), in the manner, the low punch that is forced into the body lower surface is divided into interior all side low punches 550 and outer circumferential side low punch 540 these two parts.Before being shaped, rise by making outer circumferential side drift 540, can make the powder height of powder aspect ratio formed body jut 120 of body part 110 of formed body shown in Figure 1 low.

From the state of Fig. 5 (a), upper punch 530 is descended push powder 501.Simultaneously, following outer circumferential side drift 540 direction up applies load, and down the upper surface 541 of outer circumferential side drift 540 drop to down in upper surface 551 consistent location roughly of all side blow heads 550.

According to foregoing, can make the decrement of powder roughly the same at the body 110 and the jut 120 of formed body.That is, the body 110 of formed body and the density of jut 120 are formed equably.

Like this, under the uniform situation of density of the body of powder extrusion forming body and jut, can receive following effect.

1) can make the intensity of formed body in body, jut homogenising.

2) under the situation of the shaping that is applicable to the motor core that used powder extruding magnetic core etc., make the magnetic characteristic of saturation flux density or iron loss etc. roughly even at the motor in-core.

[embodiment 3]

Utilize Fig. 8, Fig. 9 that embodiment 3 is described.Fig. 9 represents the formation of the punch die 900 of the 3rd embodiment, and Fig. 9 (a) is the stereogram that links the punch die 900 of top drift 910 and bottom drift 920, and Fig. 9 (b) is the stereogram of the punch die 900 of the state that separates with bottom drift 920 of top drift 910.

Shown in Fig. 9 (a), the punch die 900 of the 3rd embodiment is the body to formed body, the mould that the protuberance shape forms, and is roughly cylindric, circumferentially forms three protuberances 930 towards center position in the inner peripheral surface upper edge of upside.The lower surface 931 of protuberance 930 becomes the taper of axial two steps down from interior all sides to outer circumferential side.

Shown in Fig. 9 (b), punch die 900 is divided into two parts up and down in the different position of inclination of the taper lower surface 931 of protuberance 930, is separated into top drift 910 and bottom drift 920 ground and constitutes, and the divisional plane of punch die 900 and protuberance lower surface are with one side.

At this divisional plane, drift up and down is fastening with alienable method of attachment, for example by at bottom drift construction bolt (not shown), at corresponding therewith top drift nut (not shown) is installed, and can come brute force to connect drift up and down each other with bolted.

Up and down the fastening method of core is not limited to bolted, also can form protuberance the opposing party at a square one-tenth recess of the divisional plane of last low punch, by chimeric and be pressed into this jog etc. and make

top drift

910 and 920 combinations of bottom drift.

As mentioned above, the smooth divisional plane that punch die 900 constitutes at the upper surface by the lower surface of top drift and bottom drift engages top drift 910 and bottom drift 920.

In addition, the stereogram of Fig. 8 (a) powder extrusion forming body 800 that to be expression made by the powder extrusion forming device 500 that the punch die 900 of Fig. 9 is used as upper punch, Fig. 8 (b) are the amplification stereograms of circumferential lateral surface side of the I portion of the powder extrusion forming body 800 shown in the amplification presentation graphs 8 (a).

As shown in Figure 8, by using powder extrusion forming device 500, the upper surface at the body 810 of cyclic structure is shaped along the powder extrusion forming body 800 that circumferentially has three juts 820.

Powder extrusion forming body 800 has roughly barrel shape, and has at axially outstanding jut 820 in interior all sides, or the step difference of radial direction or depressed part, promptly has the step difference or a depressed part of the radial direction that forms jut 820.Circumferentially has a tapering 823 that descends from interior all side direction outer circumferential sides at the upper surface of the jut 820 of formed body 800, the upper surface of jut 820 radially have a tapering 824 that descends laterally from the inboard, on the outer peripheral face 822 of jut 820, have from top to bottom tapering 825 to outer circumferential side enlarges.

Like this, when on punch die, the tapering being set, can receive following effect.

1) because the jut of powder extrusion forming body attenuates towards axial top, so, after powder extrusion forming, pull down upper punch from formed body easily.

[embodiment 4]

Utilize Fig. 7, Figure 10, Figure 14 that the situation of stator core of 3D (three-dimensional) motor of powder extrusion forming embodiment 4 is described.

Fig. 7 is the major part profile of formation of the powder extrusion forming device 700 of expression powder extrusion forming 3D motor core, Fig. 7 (a) expression constitutes the device before the powder extrusion forming that upper punch 730 rises, Fig. 7 (b) be illustrated in upper punch 730 is descended and make low punch descend ground pushing powder be shaped powder extrusion forming body 702 just carry out after the powder extrusion forming and the device of powder extrusion forming body 702 before taking out constitutes.

In Fig. 7 (a) and (b), the left side of center line J is the formation picture of device that the punch die part of protuberance is arranged, and the right side of center line J is the formation picture of device that does not have the punch die part of protuberance.

Shown in Fig. 7 (a), powder extrusion forming device 700 is at the outer peripheral face Outboard Sections of core 710, configuration applies pushing force from the below following interior all side blow heads 750 reach outer circumferential side drift 740 down, and then at the outer peripheral face Outboard Sections of this time outer circumferential side drift 740 configuration mould 720, by this mould 720, core 710, and down in all side blow heads 750, down the space K that forms of outer circumferential side drift 740 above, dispose the upper punch 730 that applies pushing force from the top.

Shown in Fig. 7 (a), in the powder extrusion forming device 700 of this formation, by mould 720, core 710, and down in all side blow heads 750, filling powder 701 among the space K that forms of outer circumferential side drift 740 down, shown in the white arrow of Fig. 7 (b), upper punch 730 is descended apply load from the top to powder 701, and, outer circumferential side drift 740 is descended so as also from the below to powder 701 application of loads.As mentioned above, by mould 720, core 710, down in all side blow heads 750, outer

circumferential side drift

740 and 730 pairs of powders 701 of upper punch push and are shaped down, extruded body 701 makes powder.

In addition, use powder extruding core material as powder, powder extrusion forming device by forcing press applies load, so that the global density of powder extrusion forming body becomes more than 92% of real density of the powder extruding magnetic material that constitutes powder, make the powder extrusion forming body of Figure 10, structure shown in Figure 14.

Figure 10 is the stereogram of expression with the powder extrusion forming body 1000 of powder extrusion forming device 700 manufacturings, and Figure 14 is the stereogram that expression is applicable to the powder extrusion forming body 1410 that is shaped by powder extrusion forming device 700 example of motor stator.

Figure 14 (a), Figure 14 (c) are the stereograms of the motor stator of the powder extrusion forming body 1410 that is shaped with powder extrusion forming device 700, and Figure 14 (b) is the stereogram of the coil that is used for current flowing 1420 of being seized on both sides by the arms by the motor stator of these powder extrusion forming bodies 1410.

In the above-described configuration, utilize the powder extruding core material of iron, by upper punch and low punch to the powder application of load, so that the global density of the density of the rostrum configurations of powder extrusion forming body and powder extrusion forming body becomes more than 92%.

In the past, for such high density, as above-mentioned shown in Figure 4, in the bight 430 of upper trimming die 400 stress take place sometimes and concentrate, drift 400 is damaged at short notice.The density of material of formed body is high more, and the load that then is applied on the upper punch just becomes big more, so lifetime.

But in present embodiment 4, the bight 731 of punch die 730 constitutes by top drift 732 and bottom drift 733 are cut apart and linked, so can suppress the breakage of punch die 730.

By above-mentioned shaping, shown in Figure 10, Figure 14 (a), Figure 14 (c),, be shaped along the powder extrusion forming body (1000,1410) that circumferentially has 12 juts 1020 at the upper surface of circulus body 1010.

The powder extrusion forming body has roughly barrel shape, and has at axially outstanding jut 1020 in interior all sides, or the step difference of radial direction or depressed part, promptly forms the step difference or the depressed part of the radial direction of jut 1020.

In this powder extrusion forming body 1000, as shown in Figure 7, the punch die 730 of the powder extrusion forming device 700 of shaping powder extrusion forming body 1000 is the formations that are divided into top drift 732 and bottom drift 733 these two parts, the outer peripheral face side of the jut 1020 of powder extrusion forming body as shown in figure 10 and the linking part 1023 of front end face 1022 are as shown in figure 10, be shaped by the lower surface of the protuberance of top drift and the inner peripheral surface of bottom drift, the linking part 1023 of powder extrusion forming body can be formed the vertical plane of non-curved-surface structure, the shape that corner angle are arranged of non-perpendicular grade can be configured as tabular surface with front end face 1022.

In the present embodiment, only cut apart drift, but also can cut apart drift at the step difference 734 of the outer circumferential side of formed body in the position corresponding 731 with interior all juts of formed body.And then, also can and use this dual mode.

Like this, the flatness of the front end face of the jut by improving the powder extrusion forming body can be received following effect.

1) when the front end face of the jut of powder extrusion forming body was overlapping, the words of tabular surface then can improve was close to power.When connecting front end face and plane material, joint face is maximized, contact force can be improved, and useless space can be eliminated.

2) front end face is smooth, then for the narrow and small equipment of width, is desirable forming on the slim this point.

In present embodiment 4, though be that zero situation is that example is illustrated with the radius of curvature R, even radius of curvature is limited, if R＜δ/0.2 or R＜0.1mm then also can fully obtain above-mentioned effect.In addition, as shown in figure 10, δ is the width dimensions of front end face of the jut of powder extrusion forming body.

And then along with becoming R/ δ＜0.1, the little value in R/ δ＜0.05, above-mentioned effect is improved, and in addition, along with becoming the little value of R＜0.1mm, R＜0.05mm, above-mentioned effect is improved.

By the global density densification that makes the powder extrusion forming body is more than 92% of real density of the material of formation powder, has following effect.

1) the powder extrusion forming body has improved the intensity of powder extrusion forming body owing to densification becomes harder.

2) carrying in limited space under the powder extrusion forming body situation as the situation of embarkation parts, is effective.

3) can make the shaping of carrying out the powder extrusion forming body by clean die forging, boost productivity.

And then, in the shaping of the motor core that has used powder extruding core material etc., effectively utilize under the situation of powder extrusion forming body, have following effect.

4) owing to the powder extrusion forming body can be configured as more desirable shape, so can suppress the crooked magnetic flux density that improves of magnetic flux, the motor output or the motor torque that exist with ... magnetic flux density become big.

And then, owing to reduced maximum stress, thereby have following effect.

1) is applied to stress equalization on the powder extrusion forming body, can makes formed body density homogenising.

2) can reduce residual stress on the part that concentrates on the powder extrusion forming body, can reduce magnetic hysteresis and decrease.

3) when utilizing insulation to cover powder extruding core material on the powder, be applied to the stress equalization on the powder extrusion forming body and can not concentrate, so can prevent the destruction that this insulation covers, reduce the vortex flow damage.

4) owing to can prevent that the stress on the punch die is concentrated, so can not apply excessive stress, die life is elongated.

5), when parts that are used in the parts of motor, actuator or electric component, produce effect according to foregoing.

(embodiment 5)

Utilize Figure 13 that embodiment 5 is described.Figure 13 is the major part profile of the formation of expression embodiment 5, Figure 13 (a) expression makes the device before the powder extrusion forming that upper punch 1330 rises constitute 1300, Figure 13 (b) expression upper punch 1330 is descended and make down in all side blow heads 1350 descend ground pushing powders 1301 and shaping powder delivery end extruded body 1302 just carry out after the powder extrusion forming and the device formation of powder extrusion forming body 1302 before taking out.

The formed body that is shaped by present embodiment has jut 1303 at outer circumferential side, but cuts apart punch die by the projection upper end 1331 at formed body similarly to Example 4, can receive same effect.In addition, also can in formed body, cut apart drift by the step difference 1334 of perimembranous.And then, even and also can obtain same effect with this dual mode.

Claims

1. the shaping punch die of a cartridge, the shaping of this cartridge is used for the powder extrusion forming cartridge with punch die, this cartridge has roughly barrel shape, and have at the axially outstanding protuberance or the step difference or the depressed part of radial direction in interior all sides or outer circumferential side, it is characterized in that

The shaping of described cartridge has roughly barrel shape with punch die, and at least a portion at inner peripheral surface or outer peripheral face has at the outstanding protuberance of center position, with the same one side of the lower surface of this protuberance on be divided into two parts up and down, the face of cutting apart mechanically tightens together each other or is bonded together by bonding agent.

2. the shaping punch die of cartridge as claimed in claim 1, it is characterized in that the described punch die of being cut apart up and down forms recess and forms protuberance ground at another drift and embed and tighten together by bolted, screw threads for fastening or at a drift at described divisional plane each other.

3. the shaping punch die of cartridge as claimed in claim 1 is characterized in that, is divided into up and down accordingly in the two-part drift in the shape with the cartridge of powder extrusion forming, and the drift of bottom can be changed.

4. as the shaping punch die of each described cartridge in the claim 1 to 3, it is characterized in that, as the bight of the linking part of the inner peripheral surface of the drift of the lower surface of described protuberance and described bottom, be the structure that corner angle are arranged of non-curved-surface structure or be made as R and the width of the radial direction of described protuberance is made as in radius of curvature and satisfy the structure of R/ δ＜0.2mm under the situation of δ or any at least in the structure of R＜0.2mm when the radius of curvature with described bight is made as R described bight.

5. the building mortion of a cartridge, it is characterized in that, to use punch die as upper trimming die as the shaping of each the described cartridge in the claim 1 to 4, punch die under axially disposing opposite to each other with described upper trimming die, outside configuration mould at described upper trimming die and described punch die down, at the inboard of described upper trimming die and described following punch die configuration core, relatively move by making described upper punch and described low punch, the powder that is filled between described upper trimming die and the described following punch die is formed.

6. the building mortion of cartridge as claimed in claim 5, it is characterized in that, described down punch die with Zhou Chongtou and periphery drift in the roughly corresponding diameter of the external diameter of the protuberance of described cartridge is divided into, by making described upper punch and described interior Zhou Chongtou and the described periphery drift powder that is shaped that relatively moves.

7. the manufacturing process of a cartridge, it is characterized in that, punch die under axial and upper punch dispose opposite to each other, this upper punch has at the outstanding protuberance of center position at least a portion of inner peripheral surface, and with the same one side of the lower surface of this protuberance on be divided into two parts up and down, the face of cutting apart mechanically tightens together each other or is bonded together by bonding agent, outside configuration mould at described upper trimming die and described punch die down, inboard configuration core at described upper trimming die and described punch die down, by described upper punch and described low punch are relatively moved, the powder that is filled between described upper trimming die and the described down punch die is carried out powder extrusion forming, make barrel shape roughly and have the cartridge of the powder extrusion forming of step difference or depression in interior all sides.

8. the manufacturing process of cartridge as claimed in claim 7, it is characterized in that the described punch die of cutting apart up and down forms recess and forms protuberance ground at another drift and embed and tighten together by bolted, screw threads for fastening or at a drift at described divisional plane each other.

9. the manufacturing process of cartridge as claimed in claim 7 is characterized in that, is divided into up and down accordingly in the two-part drift in the shape with the cartridge of powder extrusion forming, and the drift of bottom can be changed.

10. as the manufacturing process of each described cartridge in the claim 7 to 9, it is characterized in that, as the bight of the linking part of the inner peripheral surface of the drift of the lower surface of described protuberance and described bottom, be the structure that corner angle are arranged of non-curved-surface structure or be made as R and the width of the radial direction of described protuberance is made as in radius of curvature and satisfy the structure of R/ δ＜0.2mm under the situation of δ or any at least in the structure of R＜0.2mm when the radius of curvature with described bight is made as R described bight.

11. the building mortion of a cartridge, it is characterized in that, to be used for punch die as the manufacturing process of each described cartridge of claim 7 to 10 as upper trimming die, punch die under axially disposing opposite to each other with described upper trimming die, outside configuration mould at described upper trimming die and described punch die down, inboard configuration core at described upper trimming die and described punch die down, by described upper punch and described low punch are relatively moved, the powder that is filled between described upper trimming die and the described following punch die is formed.

12. the building mortion of cartridge as claimed in claim 11, it is characterized in that, described down punch die with Zhou Chongtou and periphery drift in the roughly corresponding diameter of the external diameter of the protuberance of described cartridge is divided into, by making described upper punch and described interior Zhou Chongtou and the described periphery drift powder that is shaped that relatively moves.