CN101607288B - Small cylinder stretching device - Google Patents
Small cylinder stretching device Download PDFInfo
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- CN101607288B CN101607288B CN2009103047314A CN200910304731A CN101607288B CN 101607288 B CN101607288 B CN 101607288B CN 2009103047314 A CN2009103047314 A CN 2009103047314A CN 200910304731 A CN200910304731 A CN 200910304731A CN 101607288 B CN101607288 B CN 101607288B
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- tensioning member
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Abstract
The invention relates to the field of forming manufacture, and discloses a small cylinder stretching device comprising an stretching convex die rod, a concave die plate and a positioning guide plate, wherein the outer surface of the head of the stretching convex die rod is identical with the contour structure of the part to be stretched; a handle of the stretching convex die rod is a stress part and is used for bearing the pressure exerted by external force to the stretching convex die rod; the positioning guide plate is provided with a positioning guide port which has the diameter of larger than the outer diameter of the head of the stretching convex die rod; the concave die plate is provided with a cavity sleeved with the outer surface structure of the head of the stretching convex die rod; the concave die plate is arranged at the lower end of the guide plate; the cavity of the concave die plate is aligned with the positioning guide port of the guide plate; the head of the stretching convex die rod passes through the positioning guide port and applies force to the part to be stretched between the concave die plate and the positioning guide late. The stretching device is applicable to stretching forming manufacture of small cylinders of various materials, is characterized by being light, delicate and small, having low cost and convenient use and being capable of shortening the production cycle, and can be widely applied in manufacturing similar products of various types.
Description
Technical field
The present invention relates to moulding and make the field.
Background technology
In the product development process, we often run into a kind of small cylinder formula constructed products.Such as the battery contacts in the product battery mounting box, it makes the slim material that material generally adopts phosphor bronze QSn6.5-0.1 one class, need process that diameter is little, the cylinder mode of depth as shallow to this material.For example need process diameter is
The cylinder mode of dark 5.3 (5+0.3) mm, its wall thickness is 0.3mm.In traditional industries, for this series products manufacturing two kinds of methods are arranged usually: a kind of is the design drawing die, adopts one or many to stretch, and smooths end face at last and finishes; Another kind is exactly to adopt the way of machining to machine.
There is following problem in actual applications in prior art:
1. adopt the design drawing die, stretch by one or many, smooth the mode that end face finishes at last and process, its drawing die volume is big, cost is high, and fabrication cycle is long.
2. adopt the way of machining to machine, have the cost height, approach, make that difficulty of processing is big, qualification rate is low owing to the finished product that processes requires wall.
3. when product was in the development stage, number of spare parts was few, and often design point is unstable again, adopts above-mentioned two kinds of method costs too high, and the production cycle is long, is not suitable for the needs of market economic development.
Summary of the invention
Technical problem to be solved by this invention provides a kind of small cylinder stretching device, it has stretching convex die bar and concave template according to required stretched small cylinder structural design, the stretching convex die bar is by the axiality of the die cavity of the location of positioning guiding plate and lead assurance stretching convex die bar and die sense, by external force the stretching convex die bar is exerted pressure, the stretching convex die bar is by the guide plate guide-localization, pressure is applied to accurately treats on the tensioning member, utilize the stretched predetermined small cylinder structure of concave template and stretching convex die bar, it is little to have volume, easy-operating characteristics.
For solving the problems of the technologies described above, a kind of small cylinder stretching device provided by the invention is characterized in that, comprises stretching convex die bar, concave template and positioning guiding plate,
The head outer surface of described stretching convex die bar is consistent with the contour structures for the treatment of the required stretching of tensioning member; The shank of stretching convex die bar is the force part, is used to bear external force to stretching convex die bar institute applied pressure;
Described positioning guiding plate is offered the positioning and guiding mouth, and the diameter of positioning and guiding mouth is greater than described stretching convex die club head external diameter;
Offer die cavity on the described concave template, the structure of described die cavity and stretching convex die club head outer surface structure be fit mutually, and concave template is installed in the lower end of described guide plate, the positioning and guiding mouth of the die cavity alignment guide plate of concave template;
The head of stretching convex die bar passes the positioning and guiding mouth of offering on the described positioning guiding plate, to being positioned to treat the tensioning member application of force between concave template and the positioning guiding plate.
To being improved to of above-mentioned foundation structure, also comprise pre-tightening mechanism, described pre-tightening mechanism passes the positioning and guiding mouth of offering on the described guide plate, be pressed in the shaping position for the treatment of tensioning member that is positioned between concave template and the positioning guiding plate around, it is a plane that pre-tightening mechanism is pressed in that face for the treatment of around the tensioning member shaping position.
Prioritization scheme to said structure is, described pre-tightening mechanism comprises described locating piece and pretension pad,
Described locating piece offers locating hole, and the aperture of locating hole is greater than the head outer diameter of described stretching convex die bar, and locating piece is installed in the positioning and guiding mouth of positioning guiding plate, and locating hole is coaxial with the positioning and guiding mouth;
Be provided with projection between the shank of described stretching convex die bar and the head;
Described pretension pad has through hole, the aperture of through hole is greater than the external diameter of the stretching convex die bar external diameter less than stretching convex die bar upper protruding block, through hole is coaxial with the locating hole of described locating piece, the pretension pad is positioned on the locating piece and contacts with the projection of stretching convex die bar, the head of stretching convex die bar passes the through hole of pretension pad and the locating hole of locating piece, to being positioned to treat the tensioning member application of force between concave template and the positioning guiding plate, the height that described pretension pad and locating piece form is greater than the distance of stretching convex die bar projection lower end to the head top, in the application of force process, projection on the stretching convex die bar is under pressure stretching convex die bar shank and passes to the pretension pad, promoting locating piece at first contacts with treating tensioning member, reach the purpose that compresses in advance, the height that forms with locating piece after the pretension pad compresses fully is less than the distance of stretching convex die bar projection lower end to the head top.
To further being improved to of said structure, fixedly connected by the mutual gap of removable mode between the working face of described concave template and positioning guiding plate, face and face.
Optimized technical scheme is, fixedly connected by the guide pillar gap between the working face of described concave template and positioning guiding plate, face and face, positioning guiding plate offers the guide pillar hole, guide pillar is fixedly mounted on the described concave template 7, and positioning guiding plate is positioned on the concave template by the fit of guide pillar hole and guide pillar.
Said structure further is improved to, also comprises locating pin, described locating pin is according to the appearance and size for the treatment of tensioning member, is installed on the working face that described concave template has die cavity, and the side edge place with treating tensioning member is used for fixing the position for the treatment of tensioning member.
Further the scheme of optimizing is, described guide pillar is arranged at the marginal position that is positioned at two relative edges that treat tensioning member between concave template and the positioning guiding plate, described locating pin is arranged at the marginal position on the another one limit for the treatment of tensioning member, guide pillar cooperates with locating pin, treats tensioning member and forms three-point fix.
Further prioritization scheme to said structure is that the shank of described stretching convex die bar is connected with the rotary main shaft of the vertical equipment that has rotary main shaft; Driving the rotation of stretching convex die bar do by the vertical equipment that has rotary main shaft moves downward.
The invention has the advantages that:
1. a kind of small cylinder stretching device is provided, this device respectively form structure according to required stretched small cylinder structural design, its volume is little, cost is low, by external force the stretching convex die bar is exerted pressure, positioning guiding plate positions the stretching convex die bar, guiding, utilize the stretched predetermined small cylinder structure of concave template and stretching convex die bar, make easy and simple to handle, can solve available technology adopting design drawing die, stretch by one or many, its drawing die volume is big, the cost height, and fabrication cycle is long, and adopt the way of machining to machine the problem that cost is high.
2. at first compress, push by pre-pressing structure, reach the purpose that compresses in advance, avoid in stretching, occurring wrinkling with treating the part around the tensioning member shaping position.The pre-pressing structure of forming by pretension pad and locating piece, when tensioning member is treated in stretching, treat that tensioning member places between positioning guiding plate and the concave template, external force acts on the stretching convex die bar, it is exerted pressure, when making it to move down, the lower surface that projection drive pretension pad on the stretching convex die bar and locating piece are moved downward to locating piece touches treats the tensioning member surface, the stretching convex die bar continues to move down, pretension pad compressive deformation, produce tension force, tension force is delivered to by locating piece and treats on the tensioning member, guarantees to treat that the tensioning member flange is wrinkle resistant in stretching.Small cylinder stretching device provided by the present invention just can solve the problem for the treatment of that the tensioning member flange is wrinkling in drawing process, solved prior art and adopted drawing die, also will smooth end face behind stretched desired structure, the problem that the process-cycle is long.
3. by adopting on concave template fixedly guide pillar, guide plate is offered corresponding guide pillar hole, make guide plate freely to tear open with concave template and close, and make the positioning and guiding mouth of guide plate can aim at the moulding die cavity on the concave template, guide pillar can also be treated tensioning member and carry out spacing.
4. owing to treat that the tensioning member material is thin, the vertical equipment that adopts band conduct main shaft is to the stretching convex die bar application of force, can make the stretching convex die bar under the drive of machine spindle, do the downward motion of rotation, make even more progressive being applied to of pressure treat on the tensioning member, the better effects if all over wrinkling and drawing and forming is turned in feasible control, and, the way processing that has also solved available technology adopting machining, exist because the finished product that processes requires wall thin, make the problem that difficulty of processing is big, qualification rate is low.
5. small cylinder stretching device provided by the present invention, volume is little, cost is low, can solve when product is in the development stage, number of spare parts is few, often design point is unstable again, adopts the design drawing die or the machining process of prior art, and cost is too high, production cycle is long, is not suitable for the problem of the needs of market economic development.
The present invention is applied in the small cylinder stretch forming of various materials is made, be applicable to the stretching diameter of bore less than
Stretching depth stretches less than the cylinder of 6mm, maximum appearance and size is in (60 * 60 * 60) mm scope, have slim and graceful, exquisite, light and handy, cost is low, easy to use, can shorten the characteristics of production cycle, therefore can be used widely in the like product manufacturing of various models.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is a battery contacts cutaway view in certain type product battery mounting box;
Fig. 2 is a front view of the present invention;
Fig. 3 is a vertical view of the present invention.
Wherein, 1-guide pillar, 2-positioning guiding plate, the 3-locating piece, 4-stretching convex die bar, 5-pretension pad, the 6-locating pin, the 7-concave template, 8-treats tensioning member, the rotary main shaft of the vertical equipment of 9-band rotary main shaft, the 10-anchor clamps, 11-treats the thickness of tensioning member, and 12-treats the degree of depth of drawing and forming cylinder, and 13-treats the diameter of drawing and forming cylinder.
The specific embodiment
As shown in Figure 1, what represent among the figure is battery contacts in certain type product battery mounting box, and it is shaped as diameter 13 and is
The degree of depth 12 is the cylinder mode of 5.3 (5+0.3) mm, treats that the material of tensioning member is QSn6.5-0.1, treats that the thickness 11 of tensioning member is 0.3mm.Front view of the present invention and vertical view below in conjunction with shown in accompanying drawing 2 and the accompanying drawing 3 provide following making embodiments of the invention, and the present invention who utilizes following examples to provide can will treat that tensioning member is drawn into structure shown in Figure 1.
Embodiment one:
At first, process each required building block of present embodiment:
Make stretching convex die bar 4: the head outer surface of stretching convex die bar 4 is designed according to the contour structures for the treatment of tensioning member 8 required stretchings; The shank of stretching convex die bar 4 is the force side, is used to bear external force effect institute applied pressure;
Make positioning guiding plate 2 and concave template 7: on positioning guiding plate 2, offer the positioning and guiding mouth, the diameter of positioning and guiding mouth is greater than the head outer diameter of stretching convex die bar 4, preferably the head of stretching convex die bar 4 can with the positioning and guiding mouth matched in clearance of positioning guiding plate 2; Offer die cavity on concave template 7, the head outer surface structure of the structure of this die cavity and stretching convex die bar 4 is fit mutually, and concave template 7 is installed in the lower end of guide plate 2, and the die cavity of concave template 7 is aimed at the positioning and guiding mouth of positioning guiding plate 2.Make the positioning and guiding mouth of the die cavity alignment guide plate 2 of concave template 7, can adopt bolt that concave template 7 and guide plate 2 are located by removable mode; Perhaps the projection and the groove of the mutual fit of design on concave template 7 and guide plate 2 are realized the removable location of closing between the two; Preferably, adopt guide pillar 1 to be connected with concave template 7 interference, when the positioning and guiding mouth of positioning guiding plate 2 is aimed at the die cavity of concave template 7, on positioning guiding plate 2 with guide pillar 1 corresponding position, offer the guide pillar hole, guide pillar hole and guide pillar 1 matched in clearance, thus realize that positioning guiding plate 2 is installed on the concave template 7 by the matched in clearance of guide pillar hole and guide pillar 1.
For the setting of guide pillar 1 position, preferably guide pillar 1 be arranged in treat tensioning member 8 treat that stretch position is between the positioning and guiding mouth of the die cavity of concave template 7 and positioning guiding plate 2 time, treat residing position, 8 four limits of tensioning member.At this moment, guide pillar 1 has not only played the effect that connects concave template 7 and positioning guiding plate 2, has also played and has given the effect for the treatment of tensioning member 8 location, makes stretch position more accurate.
With reference to vertical view of the present invention shown in Figure 3, in order to save material, reduce the cost of manufacture of a kind of small cylinder stretching device provided by the present invention, can guide pillar 1 be set a length direction at positioning guiding plate 2, the width of positioning guiding plate 2 can be narrower than the size for the treatment of tensioning member 8, utilize 6 pairs of marginal positions for the treatment of tensioning member 8 parallel of locating pin to position with positioning guiding plate 2 widths, be more preferably, only need locating pin 6 to be set at the edge for the treatment of tensioning member 8 one side marginal position wherein parallel with positioning guiding plate 2 widths, can cooperate with the guide pillar 1 of both sides, treat tensioning member 8 and form three-point fix.
Next, above-mentioned parts are connected, and utilize the small cylinder stretching device provided by the present invention connect to treat tensioning member 8 to stretch: will treat that tensioning member 8 is placed between concave template 7 and the positioning guiding plate 2, utilize guide pillar 1 and locating pin 6 three-point fixs, the positioning and guiding mouth of positioning guiding plate 2 is aimed at the die cavity of concave template 7, the head of stretching convex die bar 4 is passed the positioning and guiding mouth of offering on the positioning guiding plate 2, utilize external force that stretching convex die bar 4 is exerted pressure, it is moved down, contact with the tensioning member 8 for the treatment of that is positioned between concave template 7 and the positioning guiding plate 2, and transmission pressure, utilize the stretched predetermined structure of cooperation of the die cavity and stretching convex die bar 4 heads of concave template 7.
Treat tensioning member enforcement stretched operation by the device that present embodiment one provides, simple, after the stretched predetermined structure, by the smoothing end face flange of tensioning member is processed again.
Embodiment two:
Present embodiment is to set up pre-pressing structure on the basis of embodiment one, in the present embodiment, adopts locating piece 3 and pretension pad 5 to form pre-pressing structure, makes and treats tensioning member in drawing process, turns over all over wrinkling problem with regard to solving.
At first, the existing building block among the embodiment one is processed improvement: stretching convex die bar 4 on the processing basis described in the embodiment one, is provided with projection between its head and shank, for the shape of projection, preferably annular; To offer processing of positioning and guiding mouth on the positioning guiding plate 2, make its can with locating piece 3 matched in clearance.
Next, newly-increased pre-pressing structure is processed: one, on locating piece 3, offer locating hole, the aperture of locating hole is greater than the head outer diameter of stretching convex die bar 4, locating piece 3 need be installed in the positioning and guiding mouth of positioning guiding plate 2, and locating hole is coaxial with the positioning and guiding mouth, for the structure of locating piece 3, the end face of locating piece 3, promptly with locating piece 3 on two faces of the locating hole vertical direction offered, having an end face at least is the plane, this plane is used for contacting with treating tensioning member 8.Preferably, the structure of locating piece 3 is an annular, guarantees that locating piece 3 is all smooth with the end face of contact up and down.Two, pretension pad 5 is offered through hole, the aperture of through hole is greater than the external diameter of stretching convex die bar 4 external diameter less than stretching convex die bar 4 upper protruding blocks, and the through hole of pretension pad 5 is coaxial with the locating hole of locating piece 3, for the structure of pretension pad 5, and the preferred annular that adopts.
The head of stretching convex die bar 4 is passed pretension pad 5 and locating piece 3 successively, and at this moment, the upper end of pretension pad 5 is subjected to the restriction of the projection on the stretching convex die bar 4.Before the stretching, locating piece 3 is greater than the distance of the projection lower end of stretching convex die bar 4 to the head top with pretension pad 5 formed height, in the drawing process, the distance that forms with locating piece 3 after pretension pad 5 compresses fully arrives the distance on head top less than the projection lower end of stretching convex die bar 4.
The head of stretching convex die bar 4 passes the through hole of pretension pad 5 and the locating hole of locating piece 3, when the shank pressurized of stretching convex die bar 4 moves down, the lower surface that projection drive pretension pad 5 on the stretching convex die bar 4 and locating piece 3 are moved downward to locating piece 3 touches the surface for the treatment of tensioning member 8, stretching convex die bar 4 continues to move down, pretension pad 5 compressive deformations, produce tension force, tension force is delivered to by locating piece 3 and treats on the tensioning member, assurance treats that the tensioning member flange is wrinkle resistant in stretching, reaches the purpose that compresses in advance.Stretching convex die bar 4 continues to move down, and forces to treat that tensioning member stretches along the mold cavity deformation of concave template 7, finally forms needed stretching structure.
With reference to the front view of the present invention shown in the accompanying drawing 2, for to the suffered external force of stretching convex die bar 4, the equipment that it is exerted pressure, the preferred vertical equipment that has rotary main shaft, for example drilling machine of adopting.With stretching convex die bar 4 clampings on the rotary main shaft 9 of equipment, can utilize anchor clamps 10 to carry out clamping, remainder lies on the platform of equipment, adjust the position of top and the bottom, guarantee the slip that stretching convex die bar 4 and locating piece 3, locating piece 3 and the positioning and guiding mouth that is decided to be guide plate 2 each other can be freely, then concave template 7 is fixed on the workbench of equipment;
To treat that the position of tensioning member 8 according to Fig. 3 signal is positioned between positioning guiding plate 2 and the concave template 7;
The opening device power supply, machine spindle 9 drives stretching convex die bar 4 and begins rotation, commanding apparatus, making main shaft 9 drive stretching convex die bar 4 slowly moves down, finish and treat compressing in advance and stretch forming of tensioning member 8, withdraw from stretching convex die bar 4, the closing device power supply, take off positioning guiding plate 2, locating piece 3, take out the part after being shaped.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. a small cylinder stretching device is characterized in that, comprises stretching convex die bar, concave template, positioning guiding plate and pre-tightening mechanism,
The head outer surface of described stretching convex die bar is consistent with the contour structures for the treatment of the required stretching of tensioning member; The shank of stretching convex die bar is the force part, is used to bear external force to stretching convex die bar institute applied pressure;
Described positioning guiding plate is offered the positioning and guiding mouth, and the diameter of positioning and guiding mouth is greater than described stretching convex die club head external diameter;
Offer die cavity on the described concave template, the structure of described die cavity and stretching convex die club head outer surface structure be fit mutually, and concave template is installed in the lower end of described guide plate, the positioning and guiding mouth of the die cavity alignment guide plate of concave template;
The head of stretching convex die bar passes the positioning and guiding mouth of offering on the described positioning guiding plate, to being positioned to treat the tensioning member application of force between concave template and the positioning guiding plate;
Described pre-tightening mechanism passes the positioning and guiding mouth of offering on the described guide plate, be pressed in the shaping position for the treatment of tensioning member that is positioned between concave template and the positioning guiding plate around, it is a plane that pre-tightening mechanism is pressed in that face for the treatment of around the tensioning member shaping position.
2. a kind of small cylinder stretching device as claimed in claim 1 is characterized in that, described pre-tightening mechanism comprises locating piece and pretension pad,
Described locating piece offers locating hole, and the aperture of locating hole is greater than the head outer diameter of described stretching convex die bar, and locating piece is installed in the positioning and guiding mouth of positioning guiding plate, and locating hole is coaxial with the positioning and guiding mouth;
Be provided with projection between the shank of described stretching convex die bar and the head;
Described pretension pad has through hole, the aperture of through hole is greater than the external diameter of the stretching convex die bar external diameter less than stretching convex die bar upper protruding block, through hole is coaxial with the locating hole of described locating piece, the pretension pad is positioned on the locating piece and contacts with the projection of stretching convex die bar, the head of stretching convex die bar passes the through hole of pretension pad and the locating hole of locating piece, to being positioned to treat the tensioning member application of force between concave template and the positioning guiding plate, the height that described pretension pad and locating piece form is greater than the distance of stretching convex die bar projection lower end to the head top, in the application of force process, projection on the stretching convex die bar is under pressure stretching convex die bar shank and passes to the pretension pad, promoting locating piece at first contacts with treating tensioning member, reach the purpose that compresses in advance, the height that forms with locating piece after the pretension pad compresses fully is less than the distance of stretching convex die bar projection lower end to the head top.
3. a kind of small cylinder stretching device as claimed in claim 1 or 2 is characterized in that, fixedlys connected by the mutual gap of removable mode between the working face of described concave template and positioning guiding plate, face and face.
4. a kind of small cylinder stretching device as claimed in claim 1 or 2, it is characterized in that, the working face of described concave template and positioning guiding plate, fixedly connected by the guide pillar gap between face and the face, positioning guiding plate offers the guide pillar hole, guide pillar is fixedly mounted on the described concave template (7), and positioning guiding plate is positioned on the concave template by the fit of guide pillar hole and guide pillar.
5. a kind of small cylinder stretching device as claimed in claim 3, it is characterized in that, the working face of described concave template and positioning guiding plate, fixedly connected by the guide pillar gap between face and the face, positioning guiding plate offers the guide pillar hole, guide pillar is fixedly mounted on the described concave template (7), and positioning guiding plate is positioned on the concave template by the fit of guide pillar hole and guide pillar.
6. a kind of small cylinder stretching device as claimed in claim 4, it is characterized in that, also comprise locating pin, described locating pin is according to the appearance and size for the treatment of tensioning member, be installed in working face and the side edge place that treats tensioning member that described concave template has die cavity, be used for fixing the position for the treatment of tensioning member.
7. a kind of small cylinder stretching device as claimed in claim 5, it is characterized in that, also comprise locating pin, described locating pin is according to the appearance and size for the treatment of tensioning member, be installed in working face and the side edge place that treats tensioning member that described concave template has die cavity, be used for fixing the position for the treatment of tensioning member.
8. a kind of small cylinder stretching device as claimed in claim 6, it is characterized in that, described guide pillar is arranged at the marginal position that is positioned at two relative edges that treat tensioning member between concave template and the positioning guiding plate, described locating pin is arranged at the marginal position on the one side except described two relative edges, guide pillar cooperates with locating pin, treats tensioning member and forms three-point fix.
9. a kind of small cylinder stretching device as claimed in claim 7, it is characterized in that, described guide pillar is arranged at the marginal position that is positioned at two relative edges that treat tensioning member between concave template and the positioning guiding plate, described locating pin is arranged at the marginal position on the another one limit for the treatment of tensioning member, guide pillar cooperates with locating pin, treats tensioning member and forms three-point fix.
10. a kind of small cylinder stretching device as claimed in claim 1 or 2 is characterized in that, the shank of described stretching convex die bar is connected with the rotary main shaft of the vertical equipment that has rotary main shaft; Driving the rotation of stretching convex die bar do by the vertical equipment that has rotary main shaft moves downward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103047314A CN101607288B (en) | 2009-07-23 | 2009-07-23 | Small cylinder stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103047314A CN101607288B (en) | 2009-07-23 | 2009-07-23 | Small cylinder stretching device |
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| CN101607288A CN101607288A (en) | 2009-12-23 |
| CN101607288B true CN101607288B (en) | 2011-04-20 |
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| CN2009103047314A Expired - Fee Related CN101607288B (en) | 2009-07-23 | 2009-07-23 | Small cylinder stretching device |
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| CN102169971A (en) * | 2011-03-28 | 2011-08-31 | 慈晟 | Metal shell of battery and preparation method thereof |
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