CN106825153B - A kind of accurate continuous bending method of U-shaped heavy forging - Google Patents
A kind of accurate continuous bending method of U-shaped heavy forging Download PDFInfo
- Publication number
- CN106825153B CN106825153B CN201710091394.XA CN201710091394A CN106825153B CN 106825153 B CN106825153 B CN 106825153B CN 201710091394 A CN201710091394 A CN 201710091394A CN 106825153 B CN106825153 B CN 106825153B
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- Prior art keywords
- forging
- bending
- guide plate
- back pressure
- punch
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/04—Bending rods, profiles, or tubes over a movably-arranged forming menber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
Abstract
The invention discloses a kind of accurate continuous bending method of U-shaped heavy forging, this method passes through an arc entrance cavity plate, matched punch-pin and the back pressure mould with bending guide plate are realized, this method includes heats expansion blocking by forging blank, back pressure trimming, waste heat is accurately positioned, and bending guide plate drives forging crooked position to move the steps such as bending along cavity plate entrance arching trajectory.This method has the advantages of crooked position surface quality is high, damage is small, and forging symmetry is high.
Description
Technical field
The present invention relates to a kind of bending method of heavy forging, and U-shaped heavy forging dimensional accuracy can be improved by being specifically related to one kind
With the accurate continuous bending method of surface quality.
Background technology
Curved super-long structure is still a great problem for restricting the bending production of high quality heavy forging.U-shaped heavy forging is being bent
Easily caused in deformation process load mutation, deformed area acutely be thinned, forging galled spots it is big, U-bend crank arm symmetry difference
Problem, forging total quality is low, easily causes potential safety hazard.Mainstream technology using common apparatus bending preform be aided with it is cold/
The bending special plane of thermal recalibration process or purchasing expensive avoids this technical barrier, causes process route tediously long, production cost pole
It is big to improve.
Therefore, to those skilled in the art, exploitation one kind can realize heavy forging essence on general forging equipment
Really, the processing technology of lossless, efficient bending production, to significantly reduce production cost, Improving The Quality of Products is very necessary.
The content of the invention
The technical problem to be solved by the invention is to provide a kind of U-shaped heavy forging that can implement on general forging equipment
Bend processing method, to overcome the excessively scratch and forging of the mutation of shaping load present in prior art, forging and contacting dies area
The problem of part symmetry difference.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of accurate continuous bending method of U-shaped heavy forging, this method are and matched by an arc entrance cavity plate
Punch-pin and the back pressure mould realization with bending guide plate, wherein the arc inlet profiles are the 1/4 of complete circular arc, arc radius is
100-350mm, arc entrance cavity plate working surface has been evenly arranged 3-8 roll shaft along the direction of motion per side, outside punch-pin lower surface
Side is axially disposed with the semi-cylindrical positioning bar that two radiuses are 3-5mm, the positioning bar and inner surface in the middle part of forging along bending
The detent that precompressed is formed matches, and the back pressure mould is arranged inside concave die cavity, thereon surface machined surface profile and forging
Bending area shape does not match on the outside of middle part, and lower end is connected the perseverance for providing that size is 0.15-0.25 times of bending force with hydraulic cylinder
Determine back pressure, described bending guide plate one end is connected with hinge with back pressure mould end, and pushes arcuately cavity plate and roll shaft table with punch-pin
Face is slided, and the arc entrance cavity plate bottom is dovetail-shape, and is fastened with base with drift, and the base and cavity plate dovetail are another
One end is provided with spacer groove, and the pad that thickness is up to 1.0mm is pre-installed when new molding jig assembles, with mold use,
Spacer thickness can reduce but should be not less than 0.3mm.The method includes the steps of：
A. forging is preheating to initial forging temperature, and deploys to be forged to " one " font, while contacted in the middle part of forging with punch-pin
The overseas side pressure radius in partial not bending deformation area is 4-6mm and penetrates the detent of forging width；
B. the trimming on preheated shaving die of above-mentioned forging blank, trimming are used and the non-trimming profile of forging main body
The back pressure mould to match, back pressure are 0.3-0.5 times of trimming power, ensure the glacing flatness and symmetry of forging after trimming；
C. the waste heat blank after trimming is placed into above arc entrance cavity plate immediately, by back pressure mould and connected two
In the horizontal location space that bending guide plate is formed, and realized and not buckled zone shape in the middle part of forging by back pressure model facial contour
Coarse positioning, subsequent forcing press drives punch-pin to stress on forging blank, coordinates back pressure hydraulic cylinder piston rod along forging horizontal direction
Slight jitter complete positioning bar and detent be engaged and compression, and forging blank is brought into close contact realization with back pressure mould
It is accurately positioned；
D. forcing press drives punch-pin to continue to push, and bending guide plate is carried out using hinge as rotary shaft with the process that pushes, along cavity plate
Arc entrance trajectory drives forging crooked position to carry out continuous bending deformation, continuous after forging reaches predetermined angle of bend
Bending process terminates；
E. forcing press drives punch-pin backhaul, and rising the dynamic bending guide plate of back pressure modular belt with punch-pin arcuately moves and deploy in track
Horizontality is returned to, forging demoulding simultaneously obtains the forging finished product with required angle of bend.
Further, the roll shaft along cavity plate arc arrangement is in dumbbell shape, and its radius of clean-up is 15-40mm, roll shaft and folding
The surface of curved guide plate contact is reserved with the rectangle groove that depth is 8-10mm, and groove width is unilateral pre- with respect to bending guide plate width
1-3mm gaps are stayed, and channel inlet does chamfered, to ensure move in tracks that bending guide plate is formed in groove.
Further, it is guarantee BENDING PROCESS forging and the good position relationship of bending guide plate, the bending guide plate and forging
The surface of contact is reserved with the groove that depth is forging thickness 1/3-2/3, groove width reserved 3- unilateral with respect to forging width
5mm gaps, and channel inlet does chamfered.Completed from forging initial alignment to bending, all ensure that forging is located at bending guide plate
Positioning groove in, the unilateral reserved gap of groove be used for accommodate due to forging Zona transformans come broadening.
Further, the bending guide plate length takes 1/2 forging bending arm lengths and hinge and arc entrance cavity plate planar section
The higher value of horizontal range, thickness need to ensure that bending guide plate has enough rigidity after groove is made, not sent out in bending process
Raw deformation and failure.
Further, prior art is different from, forging is simultaneously in the accurate continuous bending method of U-shaped heavy forging described herein
It is not direct to be contacted with bending die and its roll shaft, but guide forging to be transported along bending die camber line profile traces by bending guide plate
It is dynamic.Because bending guide plate is repeatedly with cavity plate and its roll shaft friction, precision and service life, the bending guide plate are bent for guarantee
From hot die steel and it is aided with Surface hardening treatment, ensures that case hardness is not less than 60HRC.
Further, the hinge fit tolerance that the bending guide plate is connected with back pressure mould is not less than H10/d10, to ensure bending
Guide plate remains in that higher positional precision with back pressure mould in bending motion progress.
Further, in order to overcome torsion problem of the circular cross-section piston rod occurred in the prior art under stress,
The cross section of the hydraulic cylinder piston rod is square.
Compared with prior art, this method has advantageous effect in that：
(1) bending load significantly reduces, process steady and smooth.This method is transported using cavity plate curved profile as bending
Dynamic rail mark, will (invention ZL200910104155.9) power can be concentrated once or twice in the prior art acute phase deformation
Lasting continuous bend deformation process is changed into once, flexural loading position progressively turns as punch-pin is descending from deformation effect area
The large deformation area of forging root is moved on to, forging bend arm is with the descending angle change recurred from 0 ° to 90 ° of punch-pin.Entirely
Process bending load, which is presented, to be risen, maintains to the smooth change declined, and the power without generally existing in the prior art can be mutated
(1-2 times) situation.Effectively reduce bending load and forging contacts the damage at stand under load position with cavity plate, bring bending forging matter
The essence lifting of amount.
(2) forging symmetry significantly improves.Applicant had found by lot of experiments, in the prior art forging symmetry difference
Basic reason is during trimming of the forging before bending, due to the shaving die using simple drift and cavity plate, shortage pair
The rigidly poor necessary support in middle part and positioning of overlength forging, easily causes forging unbalance loading, mistake in trimming stress
Move, decline forging glacing flatness, there is irregular amount of deflection in the horizontal direction in forging, further caused during bending location difficulty and
Contacting dies it is asynchronous, aggravate the asymmetry of forging.The present invention is by introducing back pressure mould in the trimming process before bending
Tool, forging body is limited in the closing space that punch-pin is formed with back pressure mould, completes trimming process, suppress trimming deformation
Generation, ensure the dimensional accuracy and symmetry of initial forging from source.
(3) positioning precision of bending machining process significantly improves.It has been found that finally bending forging dimensional accuracy with
Positioning precision in forging blank dimensional accuracy, bending initial alignment precision and process is closely related.Prior art is simultaneously
Enough attention are not given to process positioning precision, also do not take effective measure to be ensured.In this application
Technical scheme in, positioning bar is provided with punch-pin first and is provided with forging relevant position and positioning bar shape phase
The detent matched somebody with somebody, bending motion process forging are firmly locked with punch-pin in the presence of press ram and back pressure, overcome
Slide and offset caused by spot placement accuracy deficiency in the prior art；Secondly, by roll shaft working position and bending guide plate
Side makes groove, forms cavity plate, roll shaft, bending guide plate and forging deformation position state all linked with one another, is moved in BENDING PROCESS
Part is implemented to process operation all in default tracks, coordinates the piston rod of square-section, can effectively limit forging X,
Rotation and offsetting in Y plane.With reference to back pressure mechanism, the positioning precision in process can be effectively improved, it is ensured that final forging
Accurate size is stable.
(4) mold work life-span and production flexibility are greatly improved.In this application, by female bottom be designed as dove-tail form with
Base engagement, and use wedge fastening positioning.In drift groove to being provided with spacer groove on wing base, and filled in new molding jig
Certain thickness pad is pre-installed in timing.It can be measured in real time according to the progress of production because minimum porch roll shaft wears or by work
Die orifice of cavity die gap change caused by filling insufficient rigidity, and adjusted in time in the course of the work by rationally increasing and decreasing spacer thickness
Whole and guarantee mould assembly precision.The design of drift and spacer groove avoids cavity plate caused by mould fitted position changes repeatedly
Dismount the trouble of positioning, it is ensured that BENDING PROCESS is accurate, continuous high-efficient is carried out, and greatly improves the work longevity of a whole set of bending tool
Life and production flexibility.
(5) fundamentally solves the problems, such as the scratch of forging deformation position.The technical scheme that the application proposes is based on existing
The method that common apparatus is bent is compared, and most significant feature is that forging body is not direct with bending die and roll shaft
Contact, but the guiding of movement locus and the transmission of bending force are carried out using bending guide plate.Solves prior art from sheet
During 1-2 aggressive bend, forging caused by load mutation seriously abrades middle forging with roll shaft contact site, excessively subtracts
The problem of thin.
Brief description of the drawings
Fig. 1 is that the present invention use the structural representation of device, is forging in figure in progress is bent.
Fig. 2 is roll shaft structure schematic diagram.
Embodiment
In order to illustrate more clearly of the technical process of the present invention, used below using railway van coupler yoke forge piece as example
Forging, and the present invention is described in further detail with reference to its accompanying drawing.Herein it should be strongly noted that couple yoke is a kind of
The strength member of railway freight-car, it is typical U shapes mount structure, the implementation particularly suitable for the present invention.
This method realizes the curved of railway van coupler yoke forge piece 1 in the specific implementation, by constructional device shown in Fig. 1, Fig. 2
Song shaping, its structure is, including an arc entrance cavity plate 7, and matched punch-pin 21 and the back pressure with bending guide plate 2
Mould 16 realizes, wherein, the working surface 5 that the arc entrance cavity plate 7 contacts with bending guide plate 2 is the 1/4 of complete circular arc, institute
State and be evenly arranged 5 roll shaft 6a-6e per side along operative orientation on arc surface 5, as shown in Fig. 2 the roll shaft 6 is in dumbbell shape,
The surface 24 contacted with bending guide plate 2 is reserved with rectangle groove 25, and the groove width is reserved with respect to the width of bending guide plate 2 certain
Unilateral gap 23.Wherein roll shaft 6a working surfaces and arc entrance cavity plate top surface horizontal segment 18 is tangent, roll shaft 6b, 6c and 6d work
Make surface and cambered surface 5 is tangent, the die orifice upright side walls 15 of roll shaft 6e working surfaces and arc entrance cavity plate are tangent.The bending
The end hinge 17 of guide plate 2 is connected with back pressure mould 16, and it is square that section is designed with the surface 3 that bending guide plate 2 contacts with couple yoke
The through slot 26 of shape, the whole deformation position of BENDING PROCESS couple yoke 1, which is all limited in through slot 26, to be carried out.The punch-pin following table
The outside of face 20 is axially disposed with two positioning bars 4 along bending, and the positioning bar 4 is formed with inner surface precompressed in the middle part of couple yoke
Detent 19 matches.The back pressure mould 16 is arranged inside the die cavity of arc entrance cavity plate 7, thereon surface machined surface profile with
Bending area shape does not match in outside in the middle part of couple yoke, and lower end is connected with hydraulic cylinder 12 provides constant backpressure, the hydraulic cylinder
12 are connected with piston rod 11 of the section for square, and the hydraulic cylinder 12 can not pushed up back pressure mould 16 to flexure type by during external force
Chamber upper surface, while bending guide plate 2 flattens and is overlapped in the support that the horizontal segment of arc entrance cavity plate 7 is formed with roll shaft 3a working faces
On face.7 bottoms of arc entrance cavity plate are dovetail-shape, and are fastened with base 10 with drift 9, the base 10 and cavity plate swallow
The other end of tail 14 is provided with spacer groove 13, and certain thickness pad 8 is pre-installed when new molding jig assembles；When it is implemented,
The upper end of punch-pin 21 is fabricated to staged, and coupler yoke forge piece 1 departs from concave die cavity with the backhaul of punch-pin 21 after convenient bending.Back pressure
Its surface and the top surface 18 of arc entrance cavity plate when mould 16 can be stablized in idle position, original state under the effect of hydraulic cylinder 12
It is equal, after the coupler yoke forge piece 1 that expansion forging and trimming are completed is put on arc entrance cavity plate 7, the backrest of coupler yoke forge piece 1
The upper surface shape coarse positioning of pressing mold 16.When it is implemented, the arc radius reasonable value scope of arc cavity plate 7 is 280-
300mm, the working portion radius reasonable value scope of roll shaft 6 are 25-30mm, and rectangle groove 25 is relative to bending guide plate on roll shaft
The unilateral gap 23 for having 1-2mm of width, the depth of groove 25 are 8-10mm, and the length of bending guide plate 2 takes the 1/ of couple yoke bending brachium
2, about 450mm, the thickness of bending guide plate 2 take 65-70mm, it is contemplated that couple yoke flexural deformation back root part can produce horizontal direction
Broadening, so the through slot 26 that coordinates of bending guide plate 2 and coupler yoke forge piece 1 is unilateral to stay 5mm gaps 22, gash depth 17-
20mm, from the H13 mould steel that hardness after case hardened processing is 60HRC, it is connected bending guide plate 2 with back pressure mould 16
The fit tolerance of hinge 17 is H10/d10, and the piston rod 11 is square cross section, to avoid the back pressure modular belt in BENDING PROCESS
Dynamic rotation and offsetting of the coupler yoke forge piece in X, Y plane, the thickness of pad 8 of the new die prepackage is 0.8mm.When each ginseng
After number makees above-mentioned span, bending effect can be made optimal.
When the present apparatus is used to process the coupler yoke forge piece 1 used in example, following step can be specifically used：A. by couple yoke hair
Base is preheating to 1150-1180 DEG C of initial forging temperature, and deploys to be forged to " one " font, while in the middle part of couple yoke blank and punch-pin
The overseas side pressure radius in not bending deformation area of 21 contact portions is 5mm and penetrates the detent of couple yoke blank width
19；B. above-mentioned couple yoke blank trimming on the shaving die for be preheating to 300-350 DEG C, trimming are used and couple yoke main body
The back pressure mould that non-trimming profile matches, ensure the glacing flatness and symmetry of couple yoke after trimming；C. by the waste heat after trimming
Blank is placed into the level that the top of arc entrance cavity plate 7 is made up of back pressure mould 16 and two connected bending guide plates 2 immediately to be determined
In bit space, and by the upper machined surface profile of back pressure mould 16 realize with the not coarse positioning of buckled zone shape in the middle part of couple yoke, then
Forcing press drives punch-pin 21 to stress on couple yoke blank, coordinates back pressure hydraulic cylinder 12, piston rod 11 along couple yoke horizontal direction
Slight jitter complete positioning bar 4 and detent 19 be engaged and compression, and couple yoke blank is brought into close contact with back pressure mould 16
Realization is accurately positioned；
D. forcing press drives punch-pin 21 to continue to push, and bending guide plate 2 is carried out with hinge 17 as rotary shaft with the process that pushes, edge
The arc entrance trajectory of cavity plate 7 drives couple yoke crooked position to carry out continuous bending deformation, when forging 1 reaches predetermined angle of bend
Continuous bending process terminates after degree；E. forcing press drives the backhaul of punch-pin 21, and rising back pressure mould 16 with punch-pin 21 drives bending guide plate
2 arcuately track plane 5 move and deploy to be returned to horizontality, be stripped and obtain the couple yoke with required angle of bend into
Product.
Using the accurate continuous bending method of U-shaped heavy forging proposed by the present invention, and the parameter limited according to claim is closed
Manage value production coupler yoke forge piece, products obtained therefrom and conventional bending mould and invention ZL200910104155.9 are proposed two
Couple yoke properties of product obtained by segmentation bending method are compared, and beneficial effect is very notable.Concrete outcome is as follows：
Note：Ratio data is in traditional first order buckling method as contrast benchmark in table
Finally illustrate, above example is only used for being illustrated more clearly that the operation principle and process of the present invention, not
Limitation is produced to the present invention.It it may also be possible to apply the invention for processing the heavy forging of other shapes, its process principle and procedure of processing
Difference is had no with examples detailed above, therefore is not required to repeat to illustrate.The present invention makes the place of creative contribution to prior art, is
A kind of accurate continuous bending method of New-Type U heavy forging is proposed, is efficiently solved universal in prior art and its improved technology
The problem of excessively scratch of existing shaping load mutation, forging and contacting dies area and forging symmetry difference, beneficial effect is very
Significantly.
Claims (7)
1. a kind of accurate continuous bending method of U-shaped heavy forging, this method pass through an arc entrance cavity plate, matched punch-pin
Realized with the back pressure mould with bending guide plate, wherein the arc inlet profiles are 1/4, radius 100-350mm of complete circular arc,
Arc entrance cavity plate working surface has been evenly arranged 3-8 roll shaft along the direction of motion per side, and punch-pin lower surface outside is along bending axis
To the semi-cylindrical positioning bar that two radiuses are 3-5mm is disposed with, the positioning bar is formed with inner surface precompressed in the middle part of forging
Detent matches, and the back pressure mould is arranged inside concave die cavity, and outside is not in the middle part of surface machined surface profile and forging thereon
Bending area shape matches, and lower end is connected the constant backpressure for providing that size is 0.15-0.25 times of bending force with hydraulic cylinder, described
Bending guide plate one end is connected with hinge with back pressure mould end, and pushes arcuately cavity plate and the slip of roll shaft surface with punch-pin, described
Arc entrance cavity plate bottom is dovetail-shape, and is fastened with base with drift, and the base is provided with pad with the cavity plate dovetail other end
Film trap, and the pad that thickness is up to 1.0mm is pre-installed when new molding jig assembles, with mold use, spacer thickness can drop
It is low but 0.3mm should be not less than；The method includes the steps of：
A. forging is preheating to initial forging temperature, and deploys to be forged to " one " font, at the same in the middle part of forging with punch-pin contact portion
The overseas side pressure radius in not bending deformation area for 4-6mm and penetrate the detent of forging width；
B. the trimming on preheated shaving die of above-mentioned forging blank, trimming are used and the non-trimming profile phase of forging main body
The back pressure mould matched somebody with somebody, back pressure are 0.3-0.5 times of trimming power；
C. the waste heat blank after trimming is placed into above arc entrance cavity plate immediately, by back pressure mould and connected two bendings
In the horizontal location space of guide plate composition, and realize that or not thick of buckled zone shape is not determined with forging middle part by back pressure model facial contour
Position, subsequent forcing press drive punch-pin to stress on forging blank, coordinate back pressure hydraulic cylinder piston rod along the slight of forging horizontal direction
Shake complete positioning bar and detent be engaged and compression, and it is accurate fixed forging blank with back pressure mould is brought into close contact realization
Position；
D. forcing press drives punch-pin to continue to push, and bending guide plate is carried out using hinge as rotary shaft with the process that pushes, along cavity plate arc
Entrance trajectory drives forging crooked position to carry out continuous bending deformation, continuous bending mistake after forging reaches predetermined angle of bend
Journey terminates；
E. forcing press drives punch-pin backhaul, and rising the dynamic bending guide plate of back pressure modular belt with punch-pin arcuately moves and deploy to reply in track
To horizontality, forging demoulding simultaneously obtains the forging finished product with required angle of bend.
2. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that arranged along cavity plate arc
Roll shaft be in dumbbell shape, its radius of clean-up is 15-40mm, and it is 8-10mm that roll shaft is reserved with depth with the surface that bending guide plate contacts
Rectangle groove, groove width reserved 1-3mm gaps unilateral with respect to bending guide plate width, and channel inlet does chamfered.
3. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that bending guide plate and forging
The surface of contact is reserved with the groove that depth is forging thickness 1/3-2/3, groove width reserved 3-5mm unilateral with respect to forging width
Gap, and channel inlet does chamfered.
4. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that bending guide plate length takes
1/2 forging bends arm lengths and hinge and the higher value of arc entrance cavity plate planar section horizontal range, and thickness need to ensure that bending is led
Plate has enough rigidity after groove is made.
5. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that bending guide plate is from warm
Make mould steel and be aided with Surface hardening treatment, ensure that case hardness is not less than 60HRC.
6. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that bending guide plate and back pressure
The hinge fit tolerance of mould connection is not less than H10/d10.
7. a kind of accurate continuous bending method of U-shaped heavy forging as claimed in claim 1, it is characterised in that hydraulic cylinder piston rod
Cross section is square.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710091394.XA CN106825153B (en) | 2017-02-14 | 2017-02-14 | A kind of accurate continuous bending method of U-shaped heavy forging |
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| CN201710091394.XA CN106825153B (en) | 2017-02-14 | 2017-02-14 | A kind of accurate continuous bending method of U-shaped heavy forging |
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| CN106825153B true CN106825153B (en) | 2018-03-09 |
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| CN202963130U (en) * | 2012-11-16 | 2013-06-05 | 纽科伦（新乡）起重机有限公司 | Bending mold |
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2017
- 2017-02-14 CN CN201710091394.XA patent/CN106825153B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| DE3629270A1 (en) * | 1985-09-10 | 1987-03-19 | Volkswagen Ag | Apparatus for the wear-free forming of dimensionally accurate sheet-metal components with an at least approximately L-shaped or U-shaped cross-section from sheet-metal blanks or sheet-metal parts |
| JP2000167624A (en) * | 1998-12-04 | 2000-06-20 | Ryoji Ishii | Press bender system |
| CN101954396A (en) * | 2010-05-31 | 2011-01-26 | 南京万汇钢板桩有限公司 | Roll type continuous cold-bending forming fabricating method for U-shaped steel sheet pile |
| CN102228919A (en) * | 2011-06-21 | 2011-11-02 | 青岛变压器集团有限公司 | Tool special for bending steel plate |
| CN202239110U (en) * | 2011-09-22 | 2012-05-30 | 山东法因数控机械股份有限公司 | U-shaped beam bender |
| CN202963130U (en) * | 2012-11-16 | 2013-06-05 | 纽科伦（新乡）起重机有限公司 | Bending mold |
| CN103042113A (en) * | 2012-12-18 | 2013-04-17 | 芜湖开瑞金属科技有限公司 | U-shaped bend forming die of car lifting hook with pulleys |
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| CN106825153A (en) | 2017-06-13 |
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