CN1234717A - Method for manufacturing U-shaped yoke for Al-Ni-Co/neodium magnet with multistage cold forming machine - Google Patents
Method for manufacturing U-shaped yoke for Al-Ni-Co/neodium magnet with multistage cold forming machine Download PDFInfo
- Publication number
- CN1234717A CN1234717A CN98120450A CN98120450A CN1234717A CN 1234717 A CN1234717 A CN 1234717A CN 98120450 A CN98120450 A CN 98120450A CN 98120450 A CN98120450 A CN 98120450A CN 1234717 A CN1234717 A CN 1234717A
- Authority
- CN
- China
- Prior art keywords
- yoke
- unit
- punching press
- admittance
- shape
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Manufacture Of Motors, Generators (AREA)
Abstract
The present invention relates to a method for manufacturing a U-shaped yoke for an alnico magnet or a neodymium magnet used in a speaker of electronic appliances. Through such a manufacturing method, a slant portion and a stepped portion formed at an entrance portion of an accommodating unit, and an inside protrusion in the U-shaped yoke are integrally forms through once pressing with a multistage cold forming machine, thereby enhancing durability of a finished product. Also, post-processing is removed by integal formation with the forming machine. According, the present invention provides an effect that the overall production cost can be economized, including the decrease of manufacturing works, reduction of a manufacturing time and curtailment of a material cost.
Description
The present invention relates to a kind of method of making yoke, this yoke is via an element in the magnetic circuit of loud speaker sounding in the electronic equipment, more specifically say, relate to the method for making a kind of U-shape yoke, wherein this method integrally forms a predetermined chamfered portion, an inner surface and a step portion that U-shape yoke is admitted the porch, unit by a punching press without any back processing.
Generally speaking, the loud speaker in the electronic product all has one to be used to constitute the yoke that magnet is installed in its of magnetic circuit.This yoke has an admittance unit that is used to fixedly secure magnet, and the shape of one-tenth U-shape, and one surface tilts and ladder is arranged.This U-shape yoke is divided into two kinds of alnico magnet and neodium magnets usually.
With reference now to Fig. 1 and Fig. 2 A to 2F, describe the conventional method of making alnico magnet U-shape yoke in detail.
Multistage cold forming processing
As shown in Figure 1, first step is at first to emit coiling material 10a from bearing roller, with stretch this coiling material 10a and it is guided to blanking punch of stretching-machine, and material 10a is cut into predetermined length, obtain the material 100 shown in Fig. 2 A thus with first mould in the die forging machine.Here, material is steel wire from cutting into predetermined length to the final operation of finishing.
Second step is that cutting material 100 is put into second mould, pushes the two ends of cutting material 100 for the first time, and forms the basic recess 101 and the 101a of depression slightly shown in Fig. 2 B.
Third step is that punching press for the second time and forms the first meticulous recessed recess 102 shown in Fig. 2 C in advance from the left basic recess 101 of the material 100 of second mould in the 3rd mould.
The 4th step is that punching press for the third time and forms shown in Fig. 2 D by the second recessed recess 103 of preliminary dimension in advance from a left side first recess 102 of the material 100 of the 3rd mould in the 4th mould.
The 5th step be in the 5th mould with pierce punch punching press second recess 103 from the material 100 of the 4th mould, extending its outer wall, and form the admittance unit 104 shown in Fig. 2 E with desired depth.Therefore, obtain the cylindrical duct on a top that the bottom is arranged and opening wide.
Manufacturing procedure
The material 100 that is shaped in the course of processing by above-mentioned five moulds forms through multistage cold working once and admits unit 104, carries out reprocessing then.
Shown in Fig. 2 F, use cut, sloping portion 106 is formed in and the recessed adjacent side of admittance unit inlet part, and step portion 107 is formed in its outside.And, admit the inboard of unit 104 that a straight portion 105 is arranged, thereby form the U-shape yoke of alnico magnet.
Yet the U-shape yoke of traditional neodium magnet is to make of the method for Fig. 1 and Fig. 3 A to 3F, and its technology is made explanations hereinafter.Fig. 1 is the view that the used coiling material of yoke is made in expression.And Fig. 3 A to 3F represents to have traditional U-shape yoke of internal projection, has promptly represented the formed yoke shape of each manufacturing procedure successively.
At first the material cold forging is become constant shape, carry out the cutting process of whole length, a slope and a step portion then.Simultaneously, will process the internal protrusion that is positioned at the yoke inboard separately, and it is fixed in the center that yoke is admitted the unit.
In more detail, cold forging is finished by first to fourth operation.First operation is to discharge steel wire from as shown in Figure 1 coiling material 10a, with stretching-machine stretching and winding material 10a, and with a steel wire that cuts predetermined length under the die cuts, obtains the material 200 shown in Fig. 3 A then.Steel wire is cut into the material 200 of constant size by die forging in first mould.
Second operation is that the material 200 that is cut into is carried out first punching press, and obtains recessed slightly shape, shown in Fig. 3 B.The 3rd operation is that material 200 is carried out the punching press second time through the first resulting dolly dimple 201a of punching press, and forms the depression 201b of constant shapes shown in Fig. 3 C.The 4th operation is with the outer wall of pierce punch punching press depression 201b with extension depression 201b, and forms the admittance unit 201c that has desired depth shown in Fig. 3 D.
Finished after the cold forging operation, then carried out cutting process.By cutting process, along whole length cutting material 200, and the contiguous constant portion of admitting 201c outer end, unit of cutting, to form step portion 202.At the intake section of admitting unit 201c, form chamfered portion 203, shown in Fig. 3 E with predetermined angular.
After cutting process, the internal protrusion of being made by material 200 separately 210 is fixed within the admittance unit 201c of material 200, thereby obtains final product.Finish above-mentioned operation, just produced the A-type finished product neodium magnet U-shape yoke shown in Fig. 3 F.
Simultaneously, yoke both can be the A-type, also can be B-type and C-type, but the yoke of B-type or C-type did not have internal protrusion.B-type yoke admits the adjacently situated surfaces of unit that one chamfered portion is arranged at it, and is formed with step portion in its outer end; And C-type yoke only is formed with step portion in its outer end.B-type or C-type yoke create by the operation identical with above-mentioned A-type yoke.Be such rapidoprint: at first form reservation shape, and then finish whole operations by cutting its whole length, an inclined plane and a step portion by cold forging.
Make the conventional method of alnico magnet U-shaped yoke and need in die forging, finish multistage manufacturing procedure, but also need carry out the manufacturing procedure of thin separately.So,, manufacturing cost is improved owing to not only need die forging machine but also need the device or the operation of reprocessing.
And for A-type yoke, in the method for making above-mentioned traditional neodium magnet U-shape yoke, the internal protrusion of making will be secured in the admittance unit of material with adhesive separately.Therefore the shortcoming of undercapacity and manufacturing process's complexity is arranged, reduced operating efficiency.In addition, for B-type and C-type yoke,,, such yoke brings the high shortcoming of manufacturing cost after the multistage shaping of finishing by cold forging so having because of manufacturing process because final products are to obtain through cutting process more more.
Especially, in the manufacture method of traditional yoke, owing to cut into than the required longer material of the yoke of finished product, and will process it, so the shortcoming of waste material and raising manufacturing cost is arranged.
In order to address these problems, to the purpose of this invention is to provide and a kind ofly need not any reprocessing and only use the separate unit die forging machine to make the method for alnico magnet U-shape yoke.
In order to solve the problem of traditional neodium magnet U-shape yoke, another object of the present invention provides the method that a kind of usefulness one multistage cold forming machine is made neodium magnet U-shape yoke, it has integrally formed chamfered portion, the step portion of the porch, admittance unit of this neodium magnet U-shape yoke by a punching press, with its internal protrusion, thereby reduce manufacturing process, improved processability and strengthened intensity.
Another object of the present invention is to provide a kind of neodium magnet U-shape yoke with multistage cold forming machine, it has integrally formed chamfered portion, the step portion of neodium magnet U-shape yoke admittance porch, unit by a punching press, thereby the reduction manufacturing cost has been improved processability.
In order to realize above-mentioned purpose of the present invention, a kind of method of making alnico magnet U-shape yoke is provided, comprise the steps: that cutting material becomes constant length, make the material preform by first and second cutting actions, and with the front end of pierce punch punching press preform material to form predetermined endoporus, this method also comprises the steps:
The intake section that enlarges for the material that endoporus will be arranged is reduced to predetermined size, is squeezed into notch portion with mould and has the predetermined intake section that reduces internal diameter with formation; With
At the intake section front end shaping chamfered portion that reduces, and simultaneously form a straight portion, and with shaping chamfered portion and straight portion the time, form a ladder part in the outside of intake section along inner wall surface towards chamfered portion.
According to the present invention,, only can make predetermined U-shape yoke, thereby reduce manufacturing time and reduced manufacturing cost with a die forging machine without any the alnico magnet U-shape yoke manufacture method of postprocessing working procedures.
In order to realize another object of the present invention, a kind of method of making neodium magnet U-shape yoke with multistage cold forming machine is provided, it comprises material is cut into constant length, the material of being cut by the first and second operation punching presses, carry out preform, with the material behind the punching head punching press preform, and the step of the admittance unit with preliminary dimension of being shaped, this method is made up of following steps:
After being installed to the material of the admittance unit that is shaped in the mould, using this material of drift punching press, and press, form the step portion of chamfered portion He its abutting end of this edge, admittance unit with the demoulding primary drying in the mould; With
With the mold pin that mold center partly locates, this material of punching press is admitted the inboard outer wall in the unit circlewise, admits the core of unit to form an internal protrusion at this.
In order to realize another object of the present invention, a kind of method of making neodium magnet U-shape yoke with multistage cold forming machine is provided, it comprises material is cut into constant length, the material of being cut by the first and second operation punching presses, carry out preform, with the material behind the punching head punching press preform, and the step of the admittance unit with preliminary dimension of being shaped, this method is made up of following steps:
After forming in the mould that the material of admitting the unit is installed to template, with this material of drift punching press, and with the pressure of the demoulding primary drying in the mould, form the step portion of this admittance unit sides adjacent and abutting end,
Wherein the mold pin extrded material partly located of mold center is admitted the inboard of unit, to form predetermined size.
Description illustrates each preferred embodiment, wherein
Fig. 1 is the view that expression is used to make the coiling material of yoke;
Fig. 2 A to 2F is a sectional view, explains the yoke shape in each process in traditional manufacturing step of yoke successively;
Fig. 3 A to 3F represents the yoke shape in each manufacturing process's step in traditional yoke manufacture method successively;
Fig. 4 A to 4F is the view of a kind of embodiment of expression U-shape yoke manufacture method of the present invention;
Fig. 5 is the schematic diagram that the present invention's the 6th manufacturing procedure equipment therefor is finished in expression;
Fig. 6 A to 6E is the view of the another kind of embodiment of expression yoke manufacture method of the present invention;
Fig. 7 is the structure chart of the used shaped device of expression A-type yoke slender acanthopanax worker's operation of the present invention;
Fig. 8 is the structure chart of the used shaped device of expression B-type yoke slender acanthopanax worker's operation of the present invention;
Fig. 9 A and 9B represent to be installed in respectively the view of the demoulding head that is used to make B-type yoke and C-type yoke in the device shown in Figure 8; And
Figure 10 A and 10B represent B-type yoke and the C-type yoke view made respectively with Fig. 8 and 9 shown devices.
Hereinafter will be described in detail with reference to the attached drawings various preferred embodiment of the present invention.
At first, will one of embodiment of the invention be described, the manufacture method of alnico magnet U-shape yoke with reference to figure 4A to 4F and Fig. 5.
Embodiment 1
First step
Fig. 4 A is the perspective view of expression cutting material.As mentioned above, first step is to emit steel wire from bearing roller, with stretching-machine this steel wire that stretches, the steel wire after stretching is guided in the blanking punch, and by the material 10 that with blanking punch this steel wire is cut into reservation shape shown in Fig. 4 A.
Second step
Fig. 4 B is that the expression material is subjected to the sectional view of its state of extruding back for the first time.When cutting material is squeezed in mould, obtained to be formed with the rounded material 10 of first depression 11, shown in Fig. 4 B, it has a flat and short shape.
Third step
Fig. 4 C is that the expression material is subjected to the sectional view of its state of extruding back for the second time.As shown in the figure, under the supported state of a side of material 10, first depression 11 is extruded once more, preforming second depression 12.
The 4th step
Fig. 4 D is that the state sectional view after unit 13 forms is admitted in expression.Under the supported state in the rear end of material 10,, formed the admittance unit 13 that inwardly gets deeply stuck in into towards material 10 front ends by with pierce punch punching press second depression 12.
The 5th step
Fig. 4 E is the sectional view that unit 13 intake sections, 14 reduced states are admitted in expression.As shown in the figure, admitting unit 13 intake sections, 14 1 ends, form an internal heads 15 by intake section 14 being expressed to predetermined length.Internal heads 15 has a predetermined diameter that reduces to intake section 14 inside, and forms a new convex gabarit at the intake section of admitting unit 13.
The 6th step
Fig. 4 F is that the state sectional view that intake section is inboard and handle in the outside has been finished in expression according to the present invention, and Fig. 5 is the schematic representation of apparatus that an expression obtains yoke shown in Fig. 4 F.Shown in Fig. 4 F, chamfered portion 16 be formed on dwindle the front end of intake section 14, and the straight portion 17 with predetermined length forms along the inwall towards chamfered portion 16.Outside step portion 18 and chamfered portion 16 and straight portion 17 are formed in the outer end of intake section 14 simultaneously.
In order to finish these procedures, because what have that the forming machine of structure shown in Figure 5 adopts is traditional multistage die forging, so material can be handled by multistage die forging once.
That is, material 10 is installed in the mould 20, the endoporus of material 10 to interpolation to mold pin 22.The demoulding 21 is placed in and separates on the position of a preset distance from mold pin 22 outer ends, and drift 30 is positioned at the rear end of material 10.By the once pressurization of drift 30, at the front end formation chamfered portion 16 of intake section 14, and form straight portion 17 in inner wall surface simultaneously towards chamfered portion 16, form step portion 18 in the outside of intake section.Therefore, made the U-shape yoke of alnico magnet according to above-mentioned steps.
As the neodium magnet U-shape yoke manufacture method of another preferred embodiment of the present invention, will describe in more detail with reference to figure 6 to 10 hereinafter.
Embodiment 2
Fig. 6 A to 6E is the view that the yoke shape in each manufacturing process's step in the A-type yoke manufacture method of the present invention is explained in expression.
After having carried out making the necessary volume calculation of final yoke, discharge steel wire from coiling material shown in Figure 1, and it is stretched with stretching-machine, cut off then.Gained material 40 as shown in Figure 6A is introduced in the mould, and first punching press finishes preform, thereby forms the sunk part slightly 41 shown in Fig. 6 B.There is the material 40 of sunk part 41 to aim at this mould and quilt punching press for the second time, to form the sunk part 41a on the material 40 shown in Fig. 6 C.Simultaneously,, drift hammer is inserted in the sunk part 41a of material 40, thereby forms the admittance unit 41b shown in Fig. 6 D in order to stamp out the dark sunk part 41a of about 3mm by internal diameter.
When on the mould that the material 40 with the admittance unit 41b that stamps out is installed to building mortion hereinafter described and with the drift punching press, by means of a demoulding head that is installed in the mould, promptly form chamfered portion 42, and form step portion 43 near outer end place's punching press at it in the porch punching press of admitting unit 41b.Simultaneously, be arranged on the 41b inboard, admittance unit of a mold pin extrded material 40 of mold center's part, form the internal protrusion 44 shown in Fig. 6 E.Its more detailed description will provide hereinafter with reference to figure 7.
Fig. 7 is the structure chart that expression is used for the building mortion of A-type yoke the 5th operation of the present invention.
As shown in Figure 7, this building mortion comprises that a stable mould 20 that yoke material 40 shaping reservation shape yokes are installed and one are used for the drift 30 that punching press is installed in the yoke material 40 on the mould 20 and material 40 is pressed into mould 20 shapes.Specifically, mould 20 has one and is used in the demoulding of admitting unit 41b inlet portion office shaping chamfered portions 42 adjacent to material 40 21.And, in the inside of this demoulding 21, be provided with one and stretch to material 40 and admit in the unit 41b and its respective face of punching press, thereby punching press forms the mold pin 22 of internal protrusion 44.Mold pin 22 has stamping surface and circular inner hole of an annular.Therefore, when big pressure is applied on the material 40, is subjected to the respective face of annular stamping surface 23 extruding to be pushed and to be deep in the circular inner hole of mold pin 22, thereby in the admittance unit of material 40 41b, forms projection 44.
Embodiment 3
Fig. 8 is the structure chart that expression is used for making the building mortion of B-type yoke the 5th operation of the present invention, Fig. 9 A and 9B have represented that is installed in a demoulding head that is used to make B-type yoke and C-type yoke in Fig. 8 device, and Figure 10 A and 10B have represented B-type yoke and C-type yoke with the device manufacturing of Fig. 8 and 9 respectively.
Be used to the to be shaped building mortion of B-type yoke 40a is different from the vpg connection of mold pin and is used to be shaped A-type yoke 40.As shown in Figure 8, mold pin 22a is a flat portions 24 with admitting the contacted end of unit 41b inner surface.Therefore, be subjected to the yoke of this mold pin 22a punching press to admit unit 41b inner surface also to form a plane surface, make the flat admittance unit of B-type or C-type thus.
According to the sides adjacent of admitting unit 41b is the inclined-plane or the situation on plane, distinguishes B-type or C-type yoke.In manufacture process, B-type yoke 40a or C-type yoke 40b are determined by the shape of the demoulding 21.Promptly, if the demoulding 21 has chamfered portion 21a shown in Fig. 9 A with admitting the contacted counterpart of unit 41b inlet sides adjacent, then yoke admits unit 41b sides adjacent to be pressed, and forms the B-type yoke that has a chamfered portion 42 in the yoke porch shown in Figure 10 A thus.If the counterpart of the demoulding 21 has straight portion 21b shown in Fig. 9 B, then admit unit 41b sides adjacent to be pressed, form the C-type yoke that has a flat 45 in the yoke porch shown in Figure 10 B thus.
Up to finishing the 4th forming process, the B-type is according to identical process to carry out with 40b with A-type yoke 40 with C-type yoke 40a with forming machine shown in Figure 8.Be used in the forming machine shown in Figure 8 the demoulding shown in the load map 9A 21, to through being formed with the yoke material drawing of admitting unit 41b after these operations, thereby make the B-type yoke 40a shown in Figure 10 A.Be used in the forming machine shown in Figure 8 the demoulding shown in the load map 9B 21,, thereby make the C-type yoke 40b shown in Figure 10 B the yoke material drawing.
As mentioned above, obtained the U-shape yoke of alnico magnet as follows: at first come rapidoprint through multistage forging, carry out second operation work then, such as the material after cutting and the fine finishining processing with traditional die forging.But, the invention provides the effect that only promptly forms alnico magnet U-shape yoke by the multistage die forging processing of part with first step.Especially, the present invention is with a corresponding multistage cold forming machine, by a punching press, a chamfered portion and a step portion that neodium magnet U-shape yoke is admitted the unit intake section integrally have been shaped, with its internal protrusion, thereby produce the A-type, B-type and C-type yoke, therefore have enhancing intensity, save postprocessing working procedures and the advantage of improving machinability.Owing to the monolithic molding with forming machine has saved postprocessing working procedures, the worker ordinal number that saves has shortened manufacturing time.And, mainly do not finish owing to there is cut by stamping procedure, thus can cut out the material of accurate dimension from coiling material, thus prevented the loss of material.Therefore, the present invention has because of reducing the effect that material cost reduces production costs.
Here just described some embodiment of the present invention to illustrative, should be appreciated that under the condition that does not break away from design of the present invention and scope, can also produce many conversion.
Claims (6)
1. method of making alnico magnet U-shape yoke, comprise the steps: material is cut into constant length, by first and second cutting actions carry out preform and with the front end of pierce punch punching press preform material to form predetermined endoporus, this method also comprises the steps:
For the expansion intake section of material that endoporus will be arranged is reduced to predetermined size, be squeezed into notch portion with mould, have the predetermined intake section that reduces internal diameter with formation; And
At the intake section front end shaping chamfered portion that reduces, and simultaneously form a straight portion, and with shaping chamfered portion and straight portion the time, form a ladder part in the outside of intake section along inner wall surface towards chamfered portion.
2. method of making neodium magnet U-shape yoke with multistage cold forming machine, it comprises the steps: material is cut into constant length, the material of being cut by the first and second operation punching presses, and carry out preform, with the material behind the hole primary drying pressure preform, and the admittance unit that is shaped and has preliminary dimension, this method comprises the steps:
After being installed to the material that forms the admittance unit in the mould, using this material of drift punching press, and press, form the step portion of chamfered portion He its abutting end of this admittance cell side with the demoulding primary drying in the mould; With
With the mold pin of mold center's part, this material of punching press is admitted the unit inside outer wall circlewise, is formed centrally an internal protrusion in this admittance unit.
3. according to the method for the manufacturing U-shape yoke of claim 2, wherein the outstanding stamping surface of an annular and a circular inner hole that is positioned at it are arranged with admitting the corresponding mold pin in unit,
Wherein when punching press, this mold pin only is pressed into admits the unit inside outside, and forms the internal protrusion identical with the shrinkage pool shape.
4. method of making neodium magnet U-shape yoke with multistage cold forming machine, it comprises the steps: material is cut into constant length, the material of being cut by the first and second operation punching presses, carry out preform, with the material behind the punching head punching press preform, and the admittance unit that is shaped and has preliminary dimension, this method is made up of following steps:
After being installed in the mould,, and, form the sides adjacent of this admittance unit and the step portion of abutting end to the material that forms the admittance unit with the pressure of the demoulding primary drying in the mould with this material of drift punching press,
Wherein the inboard of the mold pin extrded material admittance unit of mold center's part is shaped to press preliminary dimension.
5. according to the method for the manufacturing U-shape yoke of claim 4, comprise such step: admitting the contacted demoulding of the unit sides adjacent contact portion inclined-plane that is shaped with yoke, and the respective face by the punching press yoke forms the chamfered portion that yoke is admitted the unit sides adjacent, to produce B-type yoke.
6. according to the method for the manufacturing U-shape yoke of claim 4, comprise such step: be shaped and the contacted demoulding of a yoke admittance unit sides adjacent straight contact portion, and the respective face by the punching press yoke, the shaping yoke is admitted the flat sides adjacent of unit, to produce C-type yoke.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980015926A KR100266159B1 (en) | 1998-05-04 | 1998-05-04 | Manufacturing method for u yoke |
| KR15926/98 | 1998-05-04 | ||
| KR21318/98 | 1998-06-09 | ||
| KR19980021318 | 1998-06-09 | ||
| KR30045/98 | 1998-07-25 | ||
| KR1019980030045A KR100325366B1 (en) | 1998-06-09 | 1998-07-25 | Manufacturing method of U-shaped yoke for neodymium magnet by multi-stage cold molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1234717A true CN1234717A (en) | 1999-11-10 |
Family
ID=27349720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98120450A Pending CN1234717A (en) | 1998-05-04 | 1998-10-20 | Method for manufacturing U-shaped yoke for Al-Ni-Co/neodium magnet with multistage cold forming machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1234717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095347A1 (en) * | 2014-12-16 | 2016-06-23 | 苏州赫里翁电子科技有限公司 | Method for machining yoke for balanced armature unit |
-
1998
- 1998-10-20 CN CN98120450A patent/CN1234717A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095347A1 (en) * | 2014-12-16 | 2016-06-23 | 苏州赫里翁电子科技有限公司 | Method for machining yoke for balanced armature unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1870320A (en) | Apparatus and method of producing battery case | |
| CN108372234B (en) | End cover forming processing method and stretching forming die thereof | |
| CN2838796Y (en) | Thin-wall steel composite forming die | |
| CN100339167C (en) | Method for manufacturing cooling fin of heat exchanger and its die apparatus | |
| CN1110121C (en) | Steel sheets for stator cores, stator cores with the steel sheets and munufacture thereof | |
| CN1234717A (en) | Method for manufacturing U-shaped yoke for Al-Ni-Co/neodium magnet with multistage cold forming machine | |
| CN210333990U (en) | Conical cover stamping die | |
| CN1050075C (en) | Method forming of hub from block of plate and belt wheel made from plate | |
| CN217775441U (en) | Stainless steel mesh preforming device | |
| CN217941555U (en) | Stamping die for processing aluminum foil container | |
| CN109647979B (en) | Continuous progressive die for processing unilateral bending product and processing technology thereof | |
| CN1381318A (en) | Precise punch technology for manufacturing circular or sectorial gear | |
| CN201249241Y (en) | Handle die | |
| CN212384407U (en) | Electronic product forming die with small dense holes | |
| CN209699286U (en) | A kind of new-energy automobile carbon brush holder insulating part stamping die | |
| CN108273908B (en) | Continuous stamping die and stamping method for fingerprint identification module metal structural part | |
| CN217315432U (en) | Production mold for automobile armrest frame | |
| JPH10193029A (en) | Manufacture of lead positive and negative pole terminal and its device | |
| CN114733973B (en) | Processing technology and processing die for automobile armrest frame | |
| CN217964374U (en) | Car window frame sheet metal component drawing die with synchronous swager of many blank pressing rings constructs | |
| CN214719927U (en) | Long stretching die | |
| CN210523563U (en) | Automobile support forming and processing die | |
| CN218656423U (en) | Prepressing material-blocking-preventing material-stripping mechanism | |
| CN213496269U (en) | Steel piston forging die | |
| CN214639444U (en) | Automatic demolding and stamping die for automobile front floor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |