CN105033005A - Punch forming method and punch forming die for corrugated metal foil - Google Patents
Punch forming method and punch forming die for corrugated metal foil Download PDFInfo
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- CN105033005A CN105033005A CN201510495411.7A CN201510495411A CN105033005A CN 105033005 A CN105033005 A CN 105033005A CN 201510495411 A CN201510495411 A CN 201510495411A CN 105033005 A CN105033005 A CN 105033005A
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Abstract
The invention provides a punch forming method and punch forming die for corrugated metal foil. The punch forming die comprises an upper rack die and a lower rack die, wherein the upper rack die comprises an upper forming tooth base, an upper forming tooth arranged on the upper forming tooth base and an upper shaping rack capable of moving relative to the upper forming tooth base; the upper forming tooth base is connected with the upper shaping rack through a limiting component so as to limit the upper shaping rack to the degree of freedom of moving in a die assembly direction; the lower rack die comprises a lower forming tooth base, a lower forming tooth and a lower shaping rack and has the same connection and structural position relation as the upper rack die; the upper forming tooth and the lower forming tooth are arranged asymmetrically; a sectional punch stroke is formed through the asymmetric motion of the upper shaping rack and the lower shaping rack during a die assembly process in combination with the corresponding forming teeth; and the sectional punch stroke comprises a first punch stroke for punching a material strip to bend the material strip to one side and a second punch stroke for punching the material strip to bend the material strip to the other side.
Description
Technical field
The present invention relates to metal material moulding technical field, particularly relates to a kind of wavy metal paillon foil impact forming method and punch-forming mold thereof.
Background technology
Wavy metal paillon foil is a kind of foil of bellows-shaped, has a wide range of applications in fields such as Aero-Space, defence equipment, track traffic, car radiations.The metal beehive be superimposed as half regular hexagon corrugated foil has that density is little, rigidity is low, strong shock resistance and the advantage such as compression is controlled, and can be used as buffering energy-absorbing material is widely used in track traffic safety, Aero-Space Landing Buffer etc.; The structure that the corrugated foil of short pitch, high amplitude is formed by stacking simultaneously has the strong feature of heat radiation, can be used as fin material and is widely used in the heat dissipation environment such as automobile, air-conditioning.
Existing wavy metal paillon foil forming method mainly contains gear roll forming method and the diel method of forming.Roll forming method is difficult to the corrugated plate processing short pitch, high amplitude, high-strength metal material, and the shortcoming such as corrugated plate both sides symmetry is poor, crest top land circular arc is excessive, the excessive circular arc of bent angle is excessive.And the corrugated foil that conventional ones molds affects by material mechanical performance, for low elongation material, often there is the phenomenons such as resilience, the thinning drawing crack of material, corrugated plate integrally bending, thus affect shaping after size and mechanical property.
Therefore, prior art need development.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of wavy metal paillon foil impact forming method and punch-forming mold thereof, be intended to solve existing wavy metal paillon foil forming method shaping after corrugated foil size and mechanical property not good, be difficult to realize that high amplitude is shaping, pitch is short, the problem of high bending ratio.
In order to achieve the above object, this invention takes following technical scheme:
A kind of wavy metal paillon foil punch-forming mold, comprises upper rack mould and lower rack die, and wherein, described upper rack mould comprises shaping toothholder, be arranged on the upper molding gear on shaping toothholder and can relative to the upper shaping tooth bar of upper shaping toothholder movement; Described shaping toothholder is connected with described upper shaping tooth bar by limit assembly, only has the free degree along the movement of matched moulds direction to limit described upper shaping tooth bar; Described lower rack die comprises compacted under toothholder, compacted under tooth and lower shaping tooth bar, connect and locations of structures relation identical with upper rack mould; Described upper molding gear and compacted under tooth are asymmetric setting; The assymmetric motion in matched moulds process by upper shaping tooth bar and lower shaping tooth bar, coordinates corresponding molding gear to form sectional stamping stroke; Described sectional stamping stroke comprises: the second punching stroke that punching bends to the first punching stroke and the punching of a lateral buckling to opposite side.
Described punch-forming mold, wherein, described upper shaping tooth bar comprises first motion state of stretching out described shaping toothholder and the second motion state being set back in described shaping toothholder; Described lower shaping tooth bar comprises the 3rd motion state of stretching out described compacted under toothholder and the 4th motion state being set back in described compacted under toothholder; Described first and the 3rd motion state be respectively described upper shaping tooth bar and the original state of lower shaping tooth bar in a punching stroke.
Described punch-forming mold, wherein, described upper shaping tooth bar is connected to form first and second motion state described with the body elastic of described upper rack mould by the first elastic component; Described lower shaping tooth bar is connected to form the described 3rd and the 4th motion state with the body elastic of described lower rack die by the second elastic component.
Described punch-forming mold, wherein, described limit assembly comprise in the restriction that arranges in lower shaping toothholder or lower shaping tooth bar along the movement of matched moulds direction groove and be arranged on or the side guide of compacted under toothholder front end face and rear end face.
Described punch-forming mold, wherein, described upper or compacted under tooth is arranged on or one end of compacted under toothholder; The described other end that is upper or compacted under toothholder is step, step is provided with the compression bar be fixedly connected with; Described upper or lower shaping tooth bar is provided with the step surface suitable with described compression bar to limit or the displacement of lower shaping tooth bar.
Described punch-forming mold, wherein, described upper shaping tooth bar and lower shaping tooth bar, according to stamping material characteristic, are provided with the shaping tooth of predetermined quantity.
Described punch-forming mold, wherein, is provided with the shedding mechanism for preventing from being with material phenomenon in described upper shaping tooth bar and lower shaping tooth bar; Described shedding mechanism comprises discharging thimble and connects the thimble spring of discharging thimble and upper or lower shaping tooth bar; Described discharging thimble is arranged on the shaping between cog of described upper or lower shaping tooth bar.
Described punch-forming mold, wherein, the limit for height post in gap when described upper shaping tooth bar and lower shaping tooth bar being provided with for controlling upper rack mould and lower rack die matched moulds.
Described punch-forming mold, wherein, described upper rack mould and lower rack die are provided with the guide-localization mechanism of guiding and location in punching stroke.
A kind of wavy metal paillon foil impact forming method, wherein, described method comprises:
Use punch-forming mold as above, punching is to a lateral buckling;
Punching bends to opposite side with the punch forming completing a ripple;
By upper shaping tooth bar and lower shaping tooth bar, in follow-up punching corrugated forming process, repeatedly shaping is carried out to molded ripple.
Beneficial effect: a kind of wavy metal paillon foil impact forming method provided by the invention and punch-forming mold thereof, becomes sectional stamping by an original ripple punch forming, first punching press side, then punching press opposite side.By this batch (-type), progressive shaping mode, effectively solve metal foil material punch forming easy fracture, flexible, be difficult to realize the problems such as tinsel high amplitude is shaping, pitch is short, high bending ratio, especially to the punch forming of low elongation metal foil material, greatly improve its formed precision and speed, and the corrugated foil dimensional uniformity molded is good, stable mechanical property.
Accompanying drawing explanation
Fig. 1 is the structural representation of the matched moulds state of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Fig. 2 is the structural representation of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Fig. 3 is the schematic diagram that material strip compresses by the tooth bar of shaping up and down of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Fig. 4 is the schematic diagram of the right side tooth bending of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Fig. 5 is the schematic diagram of the left side tooth bending of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Fig. 6 is the schematic diagram that the part of the upper die of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention moves to top dead centre.
Fig. 7 to be the profile of tooth angle [alpha] of the planar top surface molding gear of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention be schematic diagram of 90 °.
Fig. 8 to be the profile of tooth angle [alpha] of the circular arc end face molding gear of the wavy metal paillon foil punch-forming mold of the specific embodiment of the invention be schematic diagram of 90 °.
Detailed description of the invention
The invention provides a kind of wavy metal paillon foil impact forming method and punch-forming mold thereof.For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, be a kind of wavy metal paillon foil punch-forming mold of the specific embodiment of the invention.
Shown punch-forming mold comprises: upper rack mould 10 and lower rack die 20.
Wherein, as shown in Figures 2 and 3, described upper rack mould 10 comprises shaping toothholder 100, is arranged on upper molding gear 110 on shaping toothholder and can relative to the upper shaping tooth bar 300 of upper shaping toothholder movement.Described shaping toothholder 100 is connected with described upper shaping tooth bar 300 by limit assembly, only has the free degree along the movement of matched moulds direction to limit described upper shaping tooth bar.Described matched moulds direction specifically refers to moving direction when to carry out matched moulds punching press between upper rack mould 10 and lower rack die 20, is upper and lower vertical direction in the present embodiment.
The shaping toothholder of described up/down and up/down molding gear can be formed in one, also can for removably connect or other are fixedly connected with mode.
Accordingly, described lower rack die 20 comprises compacted under toothholder 200, is arranged on compacted under tooth 210 on compacted under toothholder and lower shaping tooth bar 400.Its connect and locations of structures relation identical with upper rack mould.That is described compacted under toothholder 200 is connected with described lower shaping tooth bar 300 by limit assembly, to limit described lower shaping tooth bar, only there is the free degree along the movement of matched moulds direction.
Described upper molding gear 110 is asymmetric setting with compacted under tooth 210.That is as shown in Figure 3, one is arranged on relatively outer outside, one is arranged on more close to the inner side of mould inside.
By the above-mentioned upper molding gear that is crisscross arranged and compacted under tooth, in cooperation, shaping tooth bar 300 and the assymmetric motion of lower shaping tooth bar 400 in matched moulds process can form the punching stroke of a segmented.Described sectional stamping stroke comprises: the second punching stroke that punching bends to the first punching stroke and the punching of a lateral buckling to opposite side.Assymmetric motion between described upper shaping tooth bar and lower shaping tooth bar specifically refers to the motion state of whether stretching out corresponding shaping toothholder between shaping tooth bar and lower shaping tooth bar, can be achieved by existing any suitable frame for movement, such as, by arranging the different Compress Spring of elastic force, different cylinders etc.
At this, following molding gear is that example is described in outside:
When entering the first punching stroke, upper shaping tooth bar 300, in upper shaping toothholder 100, is then coordinated with the outermost shaping tooth of lower shaping tooth bar by upper molding gear, punching to a lateral buckling to form the ripple of half.
Then, enter the second punching stroke, lower shaping tooth bar 400 bounces back in compacted under toothholder, is coordinated with upper molding gear by compacted under tooth, punching to opposite side bending to form a complete ripple.Then, constantly repeat above-mentioned two punching strokes, the punch forming of wavy metal paillon foil can be realized.
Above-mentioned punch-forming mold, the first aftershaping in both sides, front and back is decomposed into by one time punching molded for traditional ripple, the problem of material flowing when solving metal plastic deformation well, not easily there is the thinning even drawing crack phenomenon of corrugated foil material, reduce the impact of the mechanical property on corrugated foil, the thin metal material moulding significantly improving low elongation is the molding effect of corrugated foil of short pitch, high amplitude.
Concrete, described upper shaping tooth bar 300 comprises first motion state of stretching out described shaping toothholder and the second motion state being set back in described shaping toothholder.Accordingly, described lower shaping tooth bar 400 comprises the 3rd motion state of stretching out described compacted under toothholder and the 4th motion state being set back in described compacted under toothholder.
Described first and the 3rd motion state be respectively described upper shaping tooth bar and the original state of lower shaping tooth bar in a punching stroke.Described original state is specially the state under upper shaping tooth bar and lower shaping tooth bar are not subject to External Force Acting.
In a particular embodiment of the present invention, as shown in Figure 2, described upper shaping tooth bar 300 is connected to form first and second motion state described with the body elastic of described upper rack mould by the first elastic component 500.Described lower shaping tooth bar 400 is connected to form the described 3rd and the 4th motion state with the body elastic of described lower rack die by the second elastic component 600.Described elastic component can for Compress Spring or other realize the elastic component of identical function, such as air spring etc.
Because original state is the state that up/down shaping tooth bar stretches out shaping toothholder.Thus, on the one hand, over/under before molding gear punch forming, first upper and lower shaping tooth bar compresses material strip to be formed, thus plays good guide effect and and then effectively raise the stamping forming positional precision of molding gear.
On the other hand, in whole punching press matched moulds process, because upper and lower shaping tooth bar can compress in type ripple, thus to realize the repeatedly shaping (concrete shaping number of times determined by the shaping number of teeth amount on shaping tooth bar) of molded ripple and then the resilience of elimination metal material, on the impact of corrugated plate tooth proportions, substantially increasing stability and the uniformity of corrugated plate pitch size.Described repeatedly shaping concrete number of times can be determined according to the mechanical property of the material specifically carrying out punching press, can be realized the adjustment of shaping number of times by adjustment shaping number of teeth amount.
More specifically, as shown in Figure 2, described limit assembly specifically comprises: in the restriction arranged in upper or lower shaping toothholder or lower shaping tooth bar along the movement of matched moulds direction groove 120 or 320 and be arranged on or the side guide 30 of compacted under toothholder front end face and rear end face.
In the present embodiment, the shaping toothholder of up/down is structure as a whole, and up/down shaping tooth bar is arranged in the groove of shaping toothholder, moves along matched moulds direction.Through hole is provided with, for placing above-mentioned elastic component (Compress Spring) to realize above-mentioned different motion state in described groove.The side guide 30 being arranged on front end face and rear end face can limit shaping tooth bar and move along the axial direction of shaping toothholder, guarantees that it has the one-movement-freedom-degree in matched moulds direction.
Except the direction of motion, also need to limit the direction of motion of described shaping tooth bar on shaping toothholder.As shown in Figure 2, specifically can be realized by following structure:
Described upper or compacted under toothholder is arranged or relative one end of compacted under tooth is set to step 130 or 330, step is provided with the compression bar 40 that bolt is fixedly connected with.
As shown in Figure 3, described upper or lower shaping tooth bar is provided with the step surface 310 or 410 suitable with described compression bar.Compression bar abuts mutually with described step surface, thus restriction displacement that is upper or lower shaping tooth bar is run out of from up/down shaping toothholder to avoid it.
In the preferred embodiment, the shedding mechanism for preventing from being with material phenomenon is provided with in described upper shaping tooth bar 300 and lower shaping tooth bar 400.
As shown in Figure 2, described shedding mechanism comprises discharging thimble 51, provides the thimble spring 52 of elastic force and connects the plug screw 53 of discharging ejector pin mechanism and upper or lower shaping tooth bar.As shown in Figure 3, described discharging thimble 51 is arranged on the shaping between cog of described upper or lower shaping tooth bar.By above-mentioned shedding mechanism, when upper and lower mould is separated, material strip can be ejected, and effectively can prevent the band material phenomenon occurred in punching course.
More preferably, as shown in Figure 2, the limit for height post 60 in gap when described upper shaping tooth bar and lower shaping tooth bar being provided with for controlling upper rack mould and lower rack die matched moulds.Effectively can protect the inner body of mould by arranging limit for height post, avoiding that punching operation is improper causes damage to it.In addition, can also be adjusted by the amplitude of wave form (highly) of size to punching press ripple of adjustment limit for height post.When reducing limit for height column dimension, amplitude of wave form can be strengthened.
More specifically, described upper rack mould and lower rack die are provided with the guide-localization mechanism of guiding and location in punching stroke.
As shown in Figure 2, described guide-localization mechanism can comprise: guide pillar 1 is installed on lower bolster 2, and guide pin bushing 1A is installed on cope match-plate pattern 2A.Upper and lower rack die is located by guide pillar 1 and guide pin bushing 1A and is defined in the free degree of above-below direction.Lower bolster 2 and cope match-plate pattern 2A are all provided with positioning key 3, give compacted under toothholder and upper shaping toothholder location respectively, when making matched moulds, profile of tooth can accurately be aimed at.Should be noted that, although described guide-localization mechanism is specially guide pillar guide pin bushing form and key location in the present embodiment, the present invention also can use any suitable guide-localization mechanism in prior art or can realize other suitable frame for movements of above-mentioned guide-localization function.
Present invention also offers a kind of wavy metal paillon foil impact forming method.Described method comprises:
S1, use punch-forming mold as above, punching is to a lateral buckling;
S2, punching bend to opposite side with the punch forming completing a ripple;
S3, by upper shaping tooth bar and lower shaping tooth bar, in follow-up punching corrugated forming process, carry out repeatedly shaping to molded ripple.
Certainly, described wavy metal paillon foil impact forming method and mould thereof, not only can realize the punch forming of metal material, can also further use in prior art various suitable, stamping forming material can be applicable to form corresponding corrugated foil.
For further stating the principle of described impact forming method and mould thereof.As seen in figures 3-6, think that half regular hexagon corrugated foil substrate forming in metal beehive is example, in conjunction with diel and method thereof, punch forming process be presented below:
First, lower bolster 2 fixes, and cope match-plate pattern 2A is fixed on the driving mechanism that moves up and down, and time initial, driving mechanism drives part of the upper die to move downward from top dead centre, and the limit for height post 60 on lower shaping tooth bar 400 withstands shaping tooth bar 300.Now, profile of tooth is compressed (as shown in Figure 3) by upper and lower shaping tooth bar.
Secondly, upper rack mould part continues down to move, and the elastic force due to Compress Spring 500 is less than Compress Spring 600, therefore it is first compressed.In upper shaping tooth bar 300 compression and back in shaping toothholder 100, the first bending (as shown in Figure 4) of tooth on the right side of corrugated plate.
Again, upper rack mould part continues to move downward, and the free degree now going up shaping tooth bar 300 has been 0, and Compress Spring 600 is compressed, and lower shaping tooth bar 400 is pushed back in compacted under toothholder 200.Now upper rack mould part moves to bottom dead centre, tooth bending (as shown in Figure 5) on the left of corrugated plate.
Finally, upper rack mould moves to after bottom dead center, starts up to move.In motion process, upper and lower rack die starts to be separated, up/down shaping tooth bar is over/under under Compress Spring effect, its toothed region stretches out the toothed region (namely first and the 3rd motion state) of upper and lower shaping toothholder separately, corrugated foil, under the effect of discharging spring 7, ejects by the discharging pin 6 simultaneously up and down in each shaping tooth bar in the serrate slot of upper and lower shaping tooth bar.While treating that part of the upper die moves to top dead centre, corrugated foil is feeding forward, and step pitch is a pitch (as shown in Figure 6) of corrugated plate.
So far, a waveform punch forming completes.Perform the action of above-mentioned four steps by circulation and can enter next Waveform shaping, and in corrugation process, the action that up/down shaping tooth bar compresses described material strip can also realize the repeatedly shaping to molded ripple.
Should be noted that, although the present invention states for half regular hexagon corrugated foil substrate forming in metal beehive, described impact forming method and punch-forming mold thereof can be able to realize by the profile of tooth angle changing molding gear and shaping tooth multiplely stamping out dissimilar ripple.Such as, when the profile of tooth angle [alpha] in Fig. 3-6 is adjusted to 90 ° from 60 °, can stamp out the rectangle corrugated plate shown in Fig. 7, described profile of tooth angle [alpha] can from 0 to 90 ° of adjustment with the flat-top ripple realizing different waveforms.
In addition, the planar top surface of described profile of tooth can also be changed into circular arc end face, the corrugated plate of punching stroke dome can be realized; When circular arc end face, profile of tooth angle [alpha] equally also can adjust between 0 to 90 °.Such as, as shown in Figure 8, be dome corrugated plate stamping forming during a=90 °.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and the present invention's design and replace or change, and all these change or replace the protection domain that all should belong to the claim appended by the present invention.
Claims (10)
1. a wavy metal paillon foil punch-forming mold, comprises upper rack mould and lower rack die, it is characterized in that, described upper rack mould comprises shaping toothholder, be arranged on the upper molding gear on shaping toothholder and can relative to the upper shaping tooth bar of upper shaping toothholder movement;
Described shaping toothholder is connected with described upper shaping tooth bar by limit assembly, only has the free degree along the movement of matched moulds direction to limit described upper shaping tooth bar;
Described lower rack die comprises compacted under toothholder, compacted under tooth and lower shaping tooth bar, connect and locations of structures relation identical with upper rack mould;
Described upper molding gear and compacted under tooth are asymmetric setting; The assymmetric motion in matched moulds process by upper shaping tooth bar and lower shaping tooth bar, coordinates corresponding molding gear to form sectional stamping stroke;
Described sectional stamping stroke comprises: the second punching stroke that punching bends to the first punching stroke and the punching of a lateral buckling to opposite side.
2. punch-forming mold according to claim 1, is characterized in that, described upper shaping tooth bar comprises first motion state of stretching out described shaping toothholder and the second motion state being set back in described shaping toothholder;
Described lower shaping tooth bar comprises the 3rd motion state of stretching out described compacted under toothholder and the 4th motion state being set back in described compacted under toothholder;
Described first and the 3rd motion state be respectively described upper shaping tooth bar and the original state of lower shaping tooth bar in a punching stroke.
3. punch-forming mold according to claim 2, is characterized in that, described upper shaping tooth bar is connected to form first and second motion state described with the body elastic of described upper rack mould by the first elastic component; Described lower shaping tooth bar is connected to form the described 3rd and the 4th motion state with the body elastic of described lower rack die by the second elastic component.
4. punch-forming mold according to claim 1, it is characterized in that, described limit assembly comprise in the restriction that arranges in lower shaping toothholder or lower shaping tooth bar along the movement of matched moulds direction groove and be arranged on or the side guide of compacted under toothholder front end face and rear end face.
5. want the punch-forming mold described in 4 according to right, it is characterized in that, described upper or compacted under tooth is arranged on or one end of compacted under toothholder; The described other end that is upper or compacted under toothholder is step, step is provided with the compression bar be fixedly connected with;
Described upper or lower shaping tooth bar is provided with the step surface suitable with described compression bar to limit or the displacement of lower shaping tooth bar.
6. punch-forming mold according to claim 1, is characterized in that, described upper shaping tooth bar and lower shaping tooth bar, according to stamping material characteristic, are provided with the shaping tooth of predetermined quantity.
7. punch-forming mold according to claim 1, is characterized in that, is provided with the shedding mechanism for preventing from being with material phenomenon in described upper shaping tooth bar and lower shaping tooth bar;
Described shedding mechanism comprises discharging thimble and connects the thimble spring of discharging thimble and upper or lower shaping tooth bar; Described discharging thimble is arranged on the shaping between cog of described upper or lower shaping tooth bar.
8. punch-forming mold according to claim 1, is characterized in that, the limit for height post in gap when described upper shaping tooth bar and lower shaping tooth bar being provided with for controlling upper rack mould and lower rack die matched moulds.
9. punch-forming mold according to claim 1, is characterized in that, described upper rack mould and lower rack die are provided with the guide-localization mechanism of guiding and location in punching stroke.
10. a wavy metal paillon foil impact forming method, is characterized in that, described method comprises:
Use punch-forming mold as claimed in claim 1, punching is to a lateral buckling;
Punching bends to opposite side with the punch forming completing a ripple;
By upper shaping tooth bar and lower shaping tooth bar, in follow-up punching corrugated forming process, repeatedly shaping is carried out to molded ripple.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510495411.7A CN105033005B (en) | 2015-08-13 | 2015-08-13 | A kind of wavy metal paillon foil impact forming method and its punch-forming mold |
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| CN201510495411.7A CN105033005B (en) | 2015-08-13 | 2015-08-13 | A kind of wavy metal paillon foil impact forming method and its punch-forming mold |
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| CN105033005B CN105033005B (en) | 2017-06-06 |
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| CN107952850A (en) * | 2017-12-06 | 2018-04-24 | 湖北三环锻压设备有限公司 | A kind of bending method of steel corrugated workpiece automatic moulding |
| CN110369615A (en) * | 2019-07-26 | 2019-10-25 | 杨帅 | A kind of wavy metal paillon stamping die |
| CN113020487A (en) * | 2019-12-24 | 2021-06-25 | 中国电信股份有限公司 | Cutting machine and cutting method |
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| CN113020487A (en) * | 2019-12-24 | 2021-06-25 | 中国电信股份有限公司 | Cutting machine and cutting method |
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| Publication number | Publication date |
|---|---|
| CN105033005B (en) | 2017-06-06 |
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