CN111371214A - Claw pole hot forging and finished claw pole manufacturing process based on claw pole hot forging - Google Patents
Claw pole hot forging and finished claw pole manufacturing process based on claw pole hot forging Download PDFInfo
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- CN111371214A CN111371214A CN202010320918.XA CN202010320918A CN111371214A CN 111371214 A CN111371214 A CN 111371214A CN 202010320918 A CN202010320918 A CN 202010320918A CN 111371214 A CN111371214 A CN 111371214A
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- 210000000078 claw Anatomy 0.000 title claims abstract description 136
- 238000005242 forging Methods 0.000 title claims abstract description 115
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 230000008093 supporting effect Effects 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000005422 blasting Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000009966 trimming Methods 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 23
- 239000002184 metal Substances 0.000 abstract description 11
- 230000007704 transition Effects 0.000 abstract description 7
- 238000000641 cold extrusion Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 230000005284 excitation Effects 0.000 description 5
- 238000007127 saponification reaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/04—Windings on magnets for additional excitation ; Windings and magnets for additional excitation
- H02K21/042—Windings on magnets for additional excitation ; Windings and magnets for additional excitation with permanent magnets and field winding both rotating
- H02K21/044—Rotor of the claw pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to the technical field of claw pole manufacturing, in particular to a claw pole hot forging, wherein the inner surface of the whole groove of a groove directly adopts a complete arc transition unsupported plane part, and steel shots for subsequent shot blasting cannot be forced to remain in the groove, so that the stability of the manufacturing process is greatly improved; the invention also provides a manufacturing process of the finished claw pole of the claw pole hot forging, which is characterized in that the part of the claw pole subjected to local cold finishing by adopting a cold forming die comprises a magnetic yoke outer circular surface, a bottom plane, an inner inclined plane and a claw pole outer circular surface, and does not comprise a magnet supporting surface and a magnet positioning surface; because the magnet supporting surface and the magnet positioning surface are not extruded, no redundant material flows into the groove reserved in the forging process, residual metal burrs can not occur, and the stability of the manufacturing process is further improved.
Description
Technical Field
The invention relates to the technical field of claw pole manufacturing, in particular to a claw pole hot forging piece and a finished claw pole manufacturing process based on the claw pole hot forging piece.
Background
The claw pole is a core part in an automobile alternating-current generator rotor assembly and mainly has the function of converting an axial magnetic field generated by a magnet exciting coil in a rotor into a radial magnetic field, so that an alternating magnetic field distributed along a three-dimensional space is obtained when the rotor rotates, the alternating magnetic field moves relative to a stator to generate alternating current, and therefore the claw pole of the automobile generator is sometimes called as an automobile generator magnetic pole.
The claw pole for the hybrid excitation generator is a claw pole with a novel structure developed based on the high-power lightweight of the automobile alternating-current generator, and is different from the conventional claw pole in that magnet mounting grooves are reserved on two side faces of the claw pole, and permanent magnets can be embedded in the magnet grooves during assembly and use, so that the output power of the alternating-current generator is greatly increased under the condition that the size of the alternating-current generator is not increased.
Compared with the conventional claw pole, the claw pole for the hybrid excitation generator is additionally provided with the special structure of the magnet mounting groove, so that in order to ensure the normal mounting of the permanent magnet, the connecting part of the magnet positioning surface and the supporting surface of the magnet mounting groove cannot have an arc with the radius larger than 0.5mm, and the structural requirement needs to be further improved on the manufacturing process of the conventional claw pole so as to meet the requirement of industrial production.
At present, three manufacturing processes of claw poles for a hybrid excitation generator are mainly provided, wherein the three manufacturing processes are respectively as follows:
(1) the processing method mainly comprises the steps of hot forging blank making, magnetic annealing, cold finishing, inner hole drilling, inner hole fine boring, yoke end face turning and magnet mounting groove milling. The method has the problems that the surface of the forged piece is not treated by removing the oxide skin on the surface of the claw pole hot forged piece before annealing and cold finishing, and the direct cold finishing causes the problems of mold damage, residual oxide skin pressed into the surface of the claw pole forged piece and the like, so that the use performance of the claw pole is influenced. And the method adds a milling process to the magnet mounting groove, greatly reduces the manufacturing efficiency of the claw pole and wastes materials and cutting tools.
(2) A claw pole hot forging cold extrusion manufacturing process for a hybrid excitation generator mainly comprises the following process steps of blanking, heating, forging, trimming, shot blasting, cold extrusion, inner hole drilling, inner hole fine boring and yoke end face turning. According to the method, the accommodating groove is formed in the hot forging piece, the magnet mounting groove is manufactured in a hot forging and cold extruding mode, the magnet mounting groove does not need to be additionally milled, the manufacturing efficiency of the claw pole is improved, and materials and cutting tools are saved. However, in the method, because the material containing groove and the shot blasting process are arranged on the hot forging piece, shot blasting steel shot particles are easy to remain in the material containing groove in the actual manufacturing process, and metal burrs which cannot completely fill the material containing groove are generated during cold extrusion due to size fluctuation of the hot forging piece, so that the manufacturing process is unstable due to the problems, and the industrial production is not facilitated.
(3) The main process steps of the process method are hot forging blank making, heat treatment, shot blasting, shaping, phosphorus saponification and cold extrusion. The method realizes the manufacture of the magnet mounting groove by combining surface lubrication methods such as phosphorization and saponification and the like by increasing extrusion allowance at the slot part of the hot forging magnet through a large allowance cold extrusion mode. The process method needs to increase the surface phosphorization and saponification treatment because of larger extrusion allowance during cold forming, has larger environmental pollution and improves the requirements on a cold forming die because of larger allowance during cold extrusion. In addition, the method requires machining of the central hole for the rotor shaft to be transferred in order to obtain a complete claw pole finished product.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the stability of the prior mixed excitation generator claw pole manufacturing process is improved on the premise of not polluting the environment and reducing the manufacturing efficiency.
In a first aspect, the invention provides a claw pole hot forging, the inner surface of the whole groove of the groove directly adopts a complete arc transition unsupported plane part, and steel shots for subsequent shot blasting cannot be forced to remain in the groove, the stability of the manufacturing process is greatly improved, and the specific technical scheme is as follows:
a claw pole hot forging piece comprises a forging body,
a support part for supporting the support part,
the claw pole finger part assembly is a plurality of claw pole finger parts distributed along the circumferential direction of the central line,
the claw pole finger part and the supporting part are connected through the lower surface of the claw pole finger part,
the claw pole finger part comprises an outer circular surface, an inner inclined surface, a magnet positioning surface and a magnet supporting surface,
a curved surface groove is arranged between the magnet supporting surface and the magnet positioning surface, and the whole inner surface of the curved surface groove is of a complete section of curved surface circular arc structure.
Preferably, the arc radius of the curved surface arc structure is 0.5-1 mm.
Preferably, the arc radius of the curved surface arc structure is 1 mm.
Preferably, the included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is larger than 90 degrees.
Preferably, the included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is 91-93 degrees.
Preferably, the included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is 91.5 degrees.
The key point is that the part of the claw pole subjected to local cold finishing by adopting a cold forming die comprises a magnetic yoke excircle surface, a bottom plane, an inner inclined surface and a claw pole excircle surface, and does not comprise a magnet supporting surface and a magnet positioning surface; because do not extrude magnet holding surface and magnet locating surface, do not have unnecessary material to flow in the recess that reserves when forging, therefore residual metal burr also can not appear, the stability of manufacturing process has also been further improved, that is to say that the effect of the recess that sets up in the hot forging piece does not hold the material when the cold extrusion but only does not have the circular arc that the radius is greater than 0.5mm for guaranteeing the magnet locating surface of final finished product part magnet mounting groove and the junction of holding surface, and then appear interfering when avoiding the permanent magnet assembly, specific technical scheme is as follows:
1) obtaining a claw pole hot forging piece 01 by adopting a hot die forging method;
2) secondly, performing post-forging treatment on the claw pole hot forging piece 01 to obtain a claw pole post-forging treatment piece, wherein the post-forging treatment is direct shot blasting treatment or heat treatment and shot blasting treatment in sequence;
3) then, performing local cold finishing on the claw pole by using a cold forming die on the claw pole forged treatment piece 02 to obtain a claw pole cold-formed piece 03, wherein the part of the claw pole subjected to local cold finishing by using the cold forming die comprises a magnetic yoke outer circular surface, a bottom plane, an inner inclined plane and a claw pole outer circular surface;
4) and finally, carrying out local cutting processing on the claw pole cold-formed part 03 to obtain a claw pole finished product part 04, wherein the radius of a transitional arc at the intersection of the magnet supporting surface and the magnet positioning surface of the claw pole finished product part is not more than 0.5 mm.
Preferably, the hot die forging method in the step 1) sequentially comprises the steps of blanking, heating, upsetting blank, pre-forging, final forging and trimming, wherein the blanking is blanked by a sawing machine or a shearing machine, the heating is medium-frequency induction heating, the upsetting blank, the pre-forging and the final forging are manufactured by a hot die forging machine, and the trimming is hot cut or cold cut by a press machine to remove forging flash.
Preferably, the local cutting in the step 4) is to process a middle hole, a yoke end face, a claw pole outer circular face, a fan plane and a positioning key groove.
Preferably, the grain diameter of the steel shot is 0.8-1.2mm during shot blasting treatment, and the heat treatment is annealing or normalizing treatment of the hot forged piece.
The invention has the beneficial effects that: the invention is energy-saving and environment-friendly, the whole manufacturing process does not relate to the manufacturing process of polluting the environment, the manufacturing efficiency is high, the magnet mounting groove does not need to be milled, the manufacturing process is stable, the steel shot in the shot blasting process cannot be remained in the forge piece, the problem of metal burrs remained in the material containing groove after cold plastic forming cannot occur, and the specific beneficial effects are shown in the following aspects:
(1.1) the invention provides a claw pole hot forging, the inner surface of the whole groove of the groove directly adopts a complete circular arc transition unsupported plane part, steel shots for subsequent shot blasting cannot be forced to remain in the groove, and the stability of the manufacturing process is greatly improved;
(1.2) the arc radius of the curved surface arc structure is 0.5-1mm, and the arc radius is too small to be easily forged and formed; the arc radius is too large, so that metal burrs which cannot completely fill the arc groove can appear when the material flows in the subsequent cold finishing process, and the stability of the manufacturing process is influenced. The appropriate radius of the arc simultaneously ensures ease of forging and stability of the manufacturing process.
(1.3) an included angle a between a magnet supporting surface and a magnet positioning surface of the hot forging piece is 91-93 degrees, if the included angle is too large, the deformation amount is too large during subsequent cold finishing, if surface phosphorization and saponification treatment is not adopted, the forming defect is easy to occur, and excessive materials form redundant metal burrs; putting into cold finishing mould with the hot forging during cold finishing of contained angle undersize and hindering greatly, both having influenced production efficiency and also having reduced the mould life-span simultaneously, the green, the economic nature and the stability of product manufacturing efficiency, manufacturing process can be guaranteed simultaneously to suitable contained angle.
The invention provides a manufacturing process of a finished claw pole of a claw pole hot forging, which is characterized in that the part of the claw pole subjected to local cold finishing by adopting a cold forming die comprises an outer circular surface, a bottom plane, an inner inclined plane and an outer circular surface of a magnetic yoke, and does not comprise a magnet supporting surface and a magnet positioning surface; because do not extrude magnet holding surface and magnet locating surface, do not have unnecessary material to flow in the recess that reserves during forging, therefore also can not appear remaining metal burr, the stability of manufacturing process has also further been improved, that is to say the effect of the recess that sets up in the hot forging is not holding the material when the cold extrusion but only does not have the circular arc that the radius is greater than 0.5mm in order to guarantee that the magnet locating surface of final finished product part magnet mounting groove and the junction of holding surface, and then appear interfering when avoiding the permanent magnet assembly.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a claw pole hot forging obtained by the manufacturing process of the invention in a front view;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of the claw pole finger of FIG. 2;
FIG. 4 is a schematic structural view of a claw-pole hot forging material accommodating groove in the prior art;
FIG. 5 is a schematic structural view of claw poles 01, 02 and 03;
fig. 6 is a schematic view of the claw pole finished part 04.
In the figure: 1 magnet supporting surface, 2 magnet positioning surfaces, 3 curved surface grooves of the invention, 4 magnet yoke outer circular surfaces, 5 bottom planes, 6 inner inclined surfaces, 7 claw pole outer circular surfaces, 8 middle holes, 9 magnet yoke end surfaces, 10 fan surfaces, 11 positioning key grooves, 31 arc surfaces of the prior art material containing groove, 32 residual planes of the prior art material containing groove and 33 arc surfaces of the prior art material containing groove.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 5, the claw pole hot forged piece and the post-forged processed piece have the same shape and structure, and are different in the presence or absence of scale on the surface and in the surface roughness; the shape structures of the claw pole cold-formed part and the forged processed part are different in the shape and the precision of the reshaping part, and the reshaped part is bright;
as shown in FIG. 6, the hole structure of the claw pole finished part is different, and the claw pole finished part is a finished part model.
Example 1
A claw utmost point hot forging which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a support part for supporting the support part,
the claw pole finger part assembly is a plurality of claw pole finger parts distributed along the circumferential direction of the central line,
the claw pole finger part and the supporting part are connected through the lower surface of the claw pole finger part,
the claw pole finger part comprises an outer circular surface 7, an inner inclined surface 6, a magnet positioning surface 2 and a magnet supporting surface 1,
a curved surface groove 3 is arranged between the magnet supporting surface 1 and the magnet positioning surface 2, and the whole inner surface of the curved surface groove 3 is of a complete section of curved surface arc structure.
In a specific embodiment, the arc radius of the curved arc structure is 0.5-1 mm.
In a specific embodiment, the arc radius of the curved arc structure is 1 mm.
In one specific embodiment, the angle a between the magnet support surface 1 and the magnet positioning surface 2 of the hot forging is greater than 90 °.
Preferably, the included angle a between the magnet supporting surface 1 and the magnet positioning surface 2 of the hot forging piece is 91-93 degrees.
Preferably, the included angle a between the magnet supporting surface and the magnet positioning surface 2 of the hot forging piece is 91.5 degrees.
The invention provides a claw pole hot forging, wherein the inner surface of the whole groove of a groove directly adopts a complete circular arc transition unsupported plane part, which is different from the existing three-section structure that a material containing groove is composed of two circular arc surfaces 31 and 33 and a plane 32, the circular arc radius of the curved surface circular arc structure is 0.5-1mm, preferably 1mm, the inner surface of the whole groove of the groove directly adopts the complete circular arc transition unsupported plane part, and steel shots for subsequent shot blasting cannot be forced to remain in the groove, the stability of the manufacturing process is greatly improved, the included angle a between a magnet supporting surface 1 and a magnet positioning surface 2 of the hot forging is larger than 90 degrees, preferably 91-93 degrees, further preferably 91.5 degrees, so that the gap between the magnet supporting surface 1 and a cold forming die is reserved during subsequent cold finishing, and the requirements on the size and the form and position precision can be met.
Among the prior art, the groove structure originally was for the sake of the design of holding the material when cold extrusion, do not consider the negative effects that this groove structure's design can lead to the fact to manufacturing process, therefore can design the structure of arbitrary shape, current designer can not think of what shape structure is optimum to manufacturing process, from the angle of material, the inslot surface has the plane to judge the rationality that the surplus set up of warping through the remaining metal of actual cold extrusion more easily, so hold the silo at first and all set up the rectangle recess then rectangle closed angle department fillet forms syllogic groove structure again.
However, in the actual manufacturing process, the problem of residual metal shot after shot blasting is found, so that the groove with the original material containing function is considered to be structurally optimized, and the groove with the complete curved surface circular arc structure is finally researched through deep exploration, so that the comprehensive effect is the best. The technical scheme of the invention is provided with the following difficulties to be overcome:
(1) the claw pole finished product meeting the requirements of shape structure and dimensional accuracy is manufactured by considering the material containing function of canceling the forged piece groove;
(2) considering that the groove structure is an influencing factor influencing the stability of the manufacturing process;
(3) the supporting effect of the groove structure of the complete circular arc structure on the metal pill is considered to be minimum;
(4) consider the effect of the size of the radius of the arc on the stability of the manufacturing process.
Example 2
The invention provides a manufacturing process of a finished claw pole of a claw pole hot forging,
1) the claw pole hot forging piece 01 is obtained by adopting a hot die forging method, the steps of the hot die forging method are blanking, heating, upsetting blank, pre-forging, final forging and trimming, wherein the blanking is blanked by adopting a sawing machine or a shearing machine, the heating adopts medium-frequency induction heating, the upsetting blank, the pre-forging and the final forging processes are manufactured by adopting a hot die forging machine, and the trimming is carried out by adopting a press machine for hot cutting or cold cutting to remove forging flash;
2) secondly, performing post-forging treatment on the claw pole hot forging piece 01 to obtain a claw pole post-forging treatment piece, wherein the post-forging treatment is direct shot blasting treatment or heat treatment and shot blasting treatment in sequence;
3) then, performing local cold finishing on the claw pole by using a cold forming die on the claw pole forged treatment piece 02 to obtain a claw pole cold-finished piece 03, wherein the part of the claw pole subjected to local cold finishing by using the cold forming die comprises a magnetic yoke outer circular surface 4, a bottom plane 5, an inner inclined surface 6 and a claw pole outer circular surface 7;
4) and finally, carrying out local cutting on the claw pole cold-formed part 03 to obtain a claw pole finished part 04, wherein the radius of a transition arc at the intersection of the magnet supporting surface 1 and the magnet positioning surface 2 of the claw pole finished part is not larger than 0.5mm, and the local cutting is carried out to form a processing middle hole 8, a magnet yoke end surface 9, a claw pole outer circular surface 7, a fan plane 10 and a positioning key groove 11.
Example 3:
(1) the hot forging method specifically comprises the steps of blanking by using a shearing machine or a sawing machine to obtain a round steel blank with a certain length, heating the round steel blank to a proper forging temperature by using a medium-frequency induction heating furnace, and carrying out hot forging forming processing on the heated round steel blank by using a die by using a hot die forging machine, wherein the hot forging forming processing sequentially comprises upsetting, pre-forging, final forging and trimming. A curved surface groove 3 which is not used for containing materials is arranged between a magnet supporting surface 1 and a magnet positioning surface 2 of the claw pole hot forging piece, the whole groove inner surface of the curved surface groove 3 is of a complete section of curved surface circular arc structure, and the structure is different from a three-section structure formed by two circular arc surfaces and a plane in the existing containing groove. The arc radius of the curved surface arc structure is 0.5-1mm, preferably 1mm, the whole groove inner surface of the curved surface groove 3 directly adopts a complete arc transition unsupported plane part, steel shots for subsequent shot blasting cannot be forced to remain in the groove, and the stability of the manufacturing process is greatly improved. The included angle a between the magnet supporting surface 1 and the magnet positioning surface 2 of the hot forging piece is larger than 90 degrees, preferably 91-93 degrees, and further preferably 91.5 degrees, so that a gap is reserved between the magnet supporting surface 1 and a cold forming die during subsequent cold finishing, and the requirements on size and shape and position accuracy can be met.
(2) And secondly, performing post-forging treatment on the claw pole hot forging piece 01 to obtain a claw pole post-forging treatment piece 02, wherein the post-forging treatment is specifically to perform direct shot blasting treatment on the forging piece by using a shot blasting machine to remove oxide skin on the surface of the forging piece. The grain diameter of the steel shot is preferably 0.8-1.2mm during shot blasting treatment
(3) And then, performing cold plastic forming on the claw pole forging post-processing piece 02 by adopting a cold forming die to obtain a claw pole cold forming piece 03, and specifically, performing cold finishing on the outer circular surface 4, the bottom plane 5, the inner inclined plane 6 and the outer circular surface 7 of the magnetic yoke of the claw pole forging post-processing piece to improve the size and the form and position accuracy of the corresponding part.
(4) And finally, cutting the claw pole cold forming piece 03 to obtain a claw pole finished part 04, specifically, machining a middle hole 8, a fan surface 10, a claw pole outer circular surface 7 and a magnet yoke end surface 9 of the claw pole by using a machine tool so as to improve the size and the form and position accuracy of the corresponding part of the claw pole.
Example 4
The same as example 3, except that: the post-forging treatment in the step 2) is specifically that the claw pole is subjected to heat treatment by adopting an annealing furnace to improve the magnetic conductivity of the claw pole, and then the forged piece is subjected to direct shot blasting treatment by adopting a shot blasting machine to remove the oxide skin on the surface of the forged piece.
The cold finishing is the prior art, namely, a cold finishing die is used for carrying out small-allowance surface plastic deformation on a forge piece, and cold extrusion belongs to the subordinate concept of cold plastic deformation, the difference mainly lies in the size of the deformation allowance, the effect is mainly to ensure the size and shape position precision of the local position of a claw pole, and the existing scheme considers that the shape and position fluctuation of a magnet supporting surface and a positioning surface of a hot forging exceeds the requirements of the existing claw pole finished product, so that the two surfaces are included during cold plastic deformation.
In order to solve the problem of residual metal burrs, the cold plastic deformation is considered, and a cold finishing mode is used, namely, the deformation amount during cold forming is reduced, so that the shape position and the size precision of the local position of a product are ensured, and the stability of the manufacturing process is improved. The key point of cold finishing lies in the control of the position of plastic and plastic surplus, and this scheme is different from carrying out the plastic to magnet holding surface and locating surface among the prior art scheme, but avoids these two faces completely when the plastic, controls shape and size precision after its plastic through the contained angle size to magnet installation face and magnet locating surface in the forging structure. The angle between the magnet mounting face and the magnet locating face after cold finishing is theoretically 90 °, and a deviation of plus or minus 15' is practically allowed.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A claw utmost point hot forging which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a support part for supporting the support part,
the claw pole finger part assembly is a plurality of claw pole finger parts distributed along the circumferential direction of the central line,
the claw pole finger part and the supporting part are connected through the lower surface of the claw pole finger part,
the claw pole finger part comprises an outer circular surface, an inner inclined surface, a magnet positioning surface and a magnet supporting surface,
a curved surface groove is arranged between the magnet supporting surface and the magnet positioning surface, and the whole inner surface of the curved surface groove is of a complete section of curved surface circular arc structure.
2. The claw pole hot forging of claim 1, wherein: the arc radius of the curved surface arc structure is 0.5-1 mm.
3. The claw pole hot forging of claim 2, wherein: the arc radius of the curved surface arc structure is 1 mm.
4. The claw pole hot forging of claim 2, wherein: and the included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is larger than 90 degrees.
5. The claw pole hot forging of claim 4, wherein: and an included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is 91-93 degrees.
6. The claw pole hot forging of claim 5, wherein: and the included angle a between the magnet supporting surface and the magnet positioning surface of the hot forging piece is 91.5 degrees.
7. A process for manufacturing a finished claw pole of a claw pole hot forging according to claims 1 to 6, wherein the process comprises the following steps:
1) obtaining a claw pole hot forging piece 01 by adopting a hot die forging method;
2) secondly, performing post-forging treatment on the claw pole hot forging piece 01 to obtain a claw pole post-forging treatment piece, wherein the post-forging treatment is direct shot blasting treatment or heat treatment and shot blasting treatment in sequence;
3) then, performing local cold finishing on the claw pole by using a cold forming die on the claw pole forged treatment piece 02 to obtain a claw pole cold-formed piece 03, wherein the part of the claw pole subjected to local cold finishing by using the cold forming die comprises a magnetic yoke outer circular surface, a bottom plane, an inner inclined plane and a claw pole outer circular surface;
4) and finally, carrying out local cutting processing on the claw pole cold-formed part 03 to obtain a claw pole finished product part 04, wherein the radius of a transitional arc at the intersection of the magnet supporting surface and the magnet positioning surface of the claw pole finished product part is not more than 0.5 mm.
8. The manufacturing process of the finished claw pole of the claw pole hot forging piece according to claim 7, wherein the hot die forging method in the step 1) comprises the steps of blanking, heating, upsetting, pre-forging, final forging and trimming in sequence, wherein the blanking is blanked by a sawing machine or a shearing machine, the heating is carried out by medium frequency induction heating, the processes of upsetting, pre-forging and final forging are manufactured by a hot die forging machine, and the trimming is carried out by hot cutting or cold cutting by a press machine to remove forging flash.
9. The process for manufacturing the finished claw pole of the claw pole hot forging piece according to claim 7, wherein the local cutting in the step 4) is to machine a middle hole, a yoke end face, a claw pole outer circular face, a fan plane and a positioning key groove.
10. The process for manufacturing the finished claw pole of the claw pole hot forging piece according to claim 7, wherein the grain size of steel shots is 0.8-1.2mm during shot blasting, and the heat treatment is annealing or normalizing treatment on the hot forging piece.
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Address after: 213164 No.26 Longyu West Road, Wujin high tech Zone, Changzhou City, Jiangsu Province Applicant after: Jiangsu Longcheng Precision Forging Group Co.,Ltd. Address before: 213164 No.26 Longyu West Road, Wujin high tech Zone, Changzhou City, Jiangsu Province Applicant before: JIANGSU LONGCHENG PRECISION FORGING Co.,Ltd. |