CN106825153A - 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
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- CN106825153A CN106825153A CN201710091394.XA CN201710091394A CN106825153A CN 106825153 A CN106825153 A CN 106825153A CN 201710091394 A CN201710091394 A CN 201710091394A CN 106825153 A CN106825153 A CN 106825153A
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- forging
- bending
- guide plate
- back pressure
- pin
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Classifications
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- 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, the method passes through an arc entrance cavity plate, matched punch-pin and the back pressure mould with bending guide plate are realized, the method is included launches blocking by forging blank heating, 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 have crooked position surface quality it is high, damage small, forging symmetry advantage high.
Description
Technical field
The present invention relates to a kind of bending method of heavy forging, being specifically related to one kind can improve U-shaped heavy forging dimensional accuracy
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 in bending
Load is easily caused to be mutated in deformation process, acutely thinning, forging galled spots is big for deformed area, U-bend is cranked 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 operation 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
The processing technology of really, lossless, efficient bending production, to significantly reduce production cost, Improving The Quality of Products is very necessary.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of U-shaped heavy forging that can implement on general forging equipment
Bend processing method, to overcome the excessively scratch of the mutation of shaping load present in prior art, forging and contacting dies area and forge
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, the method passes through an arc entrance cavity plate, and matched
Punch-pin and the back pressure mould with bending guide plate realize that, wherein the arc inlet profiles are the 1/4 of complete circular arc, arc radius are
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 forging middle part inner surface 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 in middle part outside, and it is the 0.15-0.25 times of perseverance of bending force that lower end is connected with hydraulic cylinder and provides size
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 drift with base, and the base is another with cavity plate dovetail
End is provided with spacer groove, and the pad that thickness is 1.0mm to the maximum is pre-installed in brand-new die assembly, with mold use, pad
Piece thickness can be reduced but should be not less than 0.3mm.The method includes the steps of：
A. forging is preheating to initial forging temperature, and expansion is forged to " one " font, while being contacted with punch-pin in the middle part of forging
The overseas side pressure radius in partial not bending deformation area is the detent of 4-6mm and insertion forging width；
B. by the trimming on preheated shaving die of above-mentioned forging blank, trimming is used and the non-trimming profile of forging main body
The back pressure mould for matching, back pressure is 0.3-0.5 times of trimming power, it is ensured that the glacing flatness and symmetry of forging after trimming；
C. the waste heat blank after trimming is placed into arc entrance cavity plate top immediately, by back pressure mould and connected two
In the horizontal location space that bending guide plate is constituted, and realized and forging middle part not buckled zone shape 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 completion positioning bar is engaged and compression with detent, and it is accurate forging blank is brought into close contact realization with back pressure mould
Positioning；
D. forcing press drives punch-pin to continue to push, and bending guide plate is carried out with hinge as rotary shaft with the process of pushing, along cavity plate
Arc entrance trajectory drive forging crooked position carries out continuous bending deformation, is continuously rolled over after forging reaches predetermined angle of bend
Journey is bent through to terminate；
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 launch in track
Horizontality is returned to, forging demoulding simultaneously obtains the forging finished product with required angle of bend.
Further, described is in dumbbell shape along the roll shaft that cavity plate arc is arranged, 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 with respect to bending guide plate width reserved
1-3mm gaps, and channel inlet does chamfered, to ensure the move in tracks that bending guide plate is constituted 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 3-5mm unilateral with respect to forging width
Gap, and channel inlet does chamfered.Completed to bending from forging initial alignment, all ensure that forging is located at determining for bending guide plate
In the groove of position, the unilateral reserved gap of groove is used to accommodate due to the broadening that forging Zona transformans comes.
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, and 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
Do not contacted with bending die and its roll shaft directly, but transported along bending die camber line profile traces by bending guide plate guiding forging
It is dynamic.Due to guide plate repeatedly with cavity plate and its roll shaft friction, be to ensure bending precision and service life, the bending guide plate preferably uses
Hot die steel is simultaneously aided with Surface hardening treatment, it is ensured that case hardness is not less than 60HRC.
Further, the hinge fit tolerance that the guide plate is connected with back pressure mould is not less than H10/d10, to ensure bending guide plate
With back pressure mould positional precision higher is remained in that in bending motion is carried out.
Further, in order to overcome torsion problem of the circular cross-section piston rod for occurring in the prior art under stress,
The hydraulic cylinder piston rod selects non-circular cross sections, preferably square cross section.
Compared to existing technology, this method has advantageous effect in that：
(1) bending load is significantly reduced, process steady and smooth.This method is transported using cavity plate curved profile as bending
Dynamic rail mark, the acute phase deformation that (invention ZL200910104155.9) power can be concentrated once or twice in the prior art is changed
It is changed into once lasting continuous bend deformation process, flexural loading position is progressively transferred to as punch-pin is descending from deformation effect area
The large deformation area of forging root, forging bend arm is with the descending angle change recurred from 0 ° to 90 ° of punch-pin.It is whole processed
Journey bending load presents and rises, maintains to the smooth change for declining, 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 the essence of bending forging quality
Lifting.
(2) forging symmetry is significantly improved.Applicant by lot of experiments find, in the prior art forging symmetry difference
During basic reason is trimming of the forging before bending, due to the shaving die using simple drift and cavity plate, it is right to lack
The necessary support in the rigidly poor middle part of overlength forging and positioning, easily cause forging unbalance loading, offsetting in trimming stress,
Decline forging glacing flatness, irregular amount of deflection occurs in the horizontal direction in forging, further cause location difficulty and mould during bending
Asynchronous, the asymmetry of aggravation forging of contact.The present invention, will by introducing back pressure mould in the trimming operation before bending
Forging body is limited in the closing space that punch-pin is constituted with back pressure mould, completes trimming process, suppresses the generation of trimming deformation,
Ensure the dimensional accuracy and symmetry of initial forging from source.
(3) positioning precision of bending machining process is significantly improved.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, does not also 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 match with positioning bar shape
Detent, bending motion process forging firmly locks in the presence of press ram and back pressure with punch-pin, overcomes existing
There are slip and offsetting that spot placement accuracy deficiency in technology is caused；Secondly, by the inside of roll shaft working position and bending guide plate
Groove is made, cavity plate, roll shaft, bending guide plate and forging deformation position state all linked with one another, motion portion in BENDING PROCESS is formed
Part is implemented to process operation all in default tracks, coordinates the piston rod of square-section, can effectively limit forging flat in X, Y
Rotation and offsetting in face.With reference to back pressure mechanism, the positioning precision in process can be effectively improved, it is ensured that final forging's block dimension
It is precise and 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 fasten positioning using wedge.In drift groove to being provided with spacer groove on wing base, and in brand-new die assembly
When pre-install certain thickness pad.Can be according to the measurement in real time of the carrying out of production due to the abrasion or firm by frock of minimum porch roll shaft
The die orifice of cavity die gap change that degree deficiency is caused, and adjust in time in the course of the work and protect by rationally increase and decrease spacer thickness
Card die assembly precision.The design of drift and spacer groove avoids die assembly size and changes the cavity plate repeated disassembled and assembled positioning for causing
Trouble, it is ensured that BENDING PROCESS is accurate, continuous high-efficient is carried out, and working life and the production for greatly improving a whole set of bending tool are soft
Property.
(5) the abrasive problem of forging deformation position is fundamentally solved.The technical scheme that the application is proposed is based on existing
The method that common apparatus is bent is compared, and most outstanding feature is that forging body does not connect directly with bending die and roll shaft
Touch, but the guiding of movement locus and the transmission of bending force are carried out using bending guide plate.Solved in the prior art from sheet
During 1-2 aggressive bend, forging is seriously abraded forging with roll shaft contact site caused by load mutation, excessive thinning
Problem.
Brief description of the drawings
Fig. 1 is the structural representation of institute's use device of the invention, is forging in figure in bending is carried out.
Fig. 2 is roll shaft structure schematic diagram.
Specific embodiment
In order to illustrate more clearly of technical process of the invention, used as an example using railway van coupler yoke forge piece below
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 iron
The automobile-used strength member of afloat, is typical U-frame structure, is particularly suitable for implementation of the invention.
This method in the specific implementation, the curved of railway van coupler yoke forge piece 1 is realized 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 mould with bending guide plate 2
26 realize, wherein, the working surface 5 that the arc entrance cavity plate 7 is contacted with bending guide plate 2 is the 1/4 of complete circular arc, the circle
5 roll shaft 6a-6e have been evenly arranged per side along operative orientation in cambered surface 5, as shown in Fig. 2 the roll shaft 6 is in dumbbell shape, with folding
The surface 24 of the contact of curved 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 are tangent with arc entrance cavity plate top surface horizontal segment 18, roll shaft 6b, 6c and 6d working surface with
Cambered surface 5 is tangent, and roll shaft 6e working surfaces are tangent with the die orifice upright side walls 15 of arc entrance cavity plate.The end of bending guide plate 2
It is connected with back pressure mould 16 with hinge 17, the through slot of rectangular cross-section is designed with the surface 3 that bending guide plate 2 is contacted with couple yoke
26, the whole deformation position of BENDING PROCESS couple yoke 1 is carried out in being all limited in through slot 26.The outside edge of the punch-pin lower surface 20
Bending is axially disposed with two positioning bars 4, the phase of detent 19 that the positioning bar 4 is formed with the inner surface precompressed of couple yoke middle part
Matching.The back pressure mould 16 is arranged inside the die cavity of arc entrance cavity plate 7, thereon surface machined surface profile and couple yoke middle part outside
Bending area shape does not match, and lower end is connected offer constant backpressure with hydraulic cylinder 12, and the hydraulic cylinder 12 is connected with section and is
Foursquare piston rod 11, can push up to bending die cavity upper surface back pressure mould 16, while folding when the hydraulic cylinder 12 does not receive external force
Curved guide plate 2 is flattened and is overlapped on the supporting surface that the horizontal segment of arc entrance cavity plate 7 is formed with roll shaft 3a working faces.The arc entrance
The bottom of cavity plate 7 is dovetail-shape, and is fastened with drift 9 with base 10, and the base 10 is provided with the other end of cavity plate dovetail 14
Spacer groove 13, and pre-install certain thickness pad 8 in brand-new die assembly；During specific implementation, the upper end of the punch-pin 21 makes
Into staged, coupler yoke forge piece 1 departs from concave die cavity with the backhaul of punch-pin 21 after convenient bending.Back pressure mould 16 is acted in hydraulic cylinder 12
Under can to stablize its surface at idle position, original state equal with the top surface 18 of arc entrance cavity plate, when launching to forge and cut
After the coupler yoke forge piece 1 that side completes is put on arc entrance cavity plate 7, the upper surface shape of 1 backrest pressing mold of coupler yoke forge piece 16 is slightly fixed
Position.During specific implementation, the arc radius reasonable value scope of arc cavity plate 7 is 280-300mm, and the working portion radius of roll shaft 6 is closed
Reason span is 25-30mm, the gap 23 for having a 1-2mm unilateral relative to bending guide plate width of rectangle groove 25, ditch on roll shaft
The depth of groove 25 is 8-10mm, and the length of bending guide plate 2 takes the 1/2 of couple yoke bending brachium, and about 450mm, the thickness of bending guide plate 2 takes
65-70mm, it is contemplated that couple yoke flexural deformation back root part can produce the broadening of horizontal direction, so bending guide plate 2 and couple yoke
The through slot 26 of the cooperation of forging 1 is unilateral to stay 5mm gaps 22, and gash depth is 17-20mm, and bending guide plate 2 is from case hardened
Hardness is the H13 mould steel of 60HRC after treatment, and the fit tolerance of hinge 17 that it is connected with back pressure mould 16 is H10/d10, the work
Stopper rod 11 is square cross section, to avoid the dynamic coupler yoke forge piece of the back pressure modular belt in pressure-loaded and BENDING PROCESS flat in X, Y
Rotation and offsetting in face, the thickness of pad 8 of the new die prepackage is 0.8mm.After each parameter makees above-mentioned span, can
Make bending effect optimal.
When the present apparatus is used to process the coupler yoke forge piece 1 used by 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 expansion is forged to " one " font, at the same in the middle part of couple yoke blank with punch-pin 21
The overseas side pressure radius in not bending deformation area of contact portion is the detent 19 of 5mm and insertion couple yoke blank width；
B. by above-mentioned couple yoke blank trimming on the shaving die for be preheating to 300-350 DEG C, trimming is cut using non-with couple yoke main body
The back pressure mould that edge profile matches, it is ensured that the glacing flatness and symmetry of couple yoke after trimming；C. by the waste heat blank after trimming
It is empty by the horizontal location that back pressure mould 16 and two connected bending guide plates 2 are constituted that the top of arc entrance cavity plate 7 is placed into immediately
It is interior, and the coarse positioning with couple yoke middle part not buckled zone shape, subsequent pressure are realized by the upper machined surface profile of back pressure mould 16
Machine drives punch-pin 21 to stress on couple yoke blank, coordinates back pressure hydraulic cylinder 12, piston rod 11 slight along couple yoke horizontal direction
Shake completion positioning bar 4 is engaged and compression with detent 19, and couple yoke blank is brought into close contact realization with back pressure mould 16
It 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 of pushing, edge
The arc entrance trajectory of cavity plate 7 drive couple yoke crooked position carries out continuous bending deformation, when forging 1 reaches predetermined angle of bend
Continuous bending process terminates afterwards；E. forcing press drives the backhaul of punch-pin 21, and rising back pressure mould 16 with punch-pin 21 drives the edge of bending guide plate 2
Arching trajectory face 5 is moved and launches to be returned to horizontality, and the demoulding simultaneously obtains the couple yoke finished product with required angle of bend.
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
Reason value production coupler yoke forge piece, propose two sections of products obtained therefrom and conventional bending mould and invention ZL200910104155.9
Couple yoke properties of product obtained by formula bending method are compared, and beneficial effect is very notable.Concrete outcome is as follows：
Note：Ratio data is contrast benchmark in traditional first order buckling method in table
Finally illustrate, above example is only used for being illustrated more clearly that operation principle of the invention and process, not
Limitation is produced to the present invention.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 citing.The present invention makes the place of creative contribution to prior art, is to carry
A kind of accurate continuous bending method of New-Type U heavy forging is gone out, has efficiently solved and generally deposit in prior art and its improved technology
The excessively scratch of shaping load mutation, forging and contacting dies area and forging symmetry difference problem, beneficial effect shows very much
Write.
Claims (7)
1. a kind of accurate continuous bending method of U-shaped heavy forging, the method is by an arc entrance cavity plate, matched punch-pin
Realize that, wherein the arc inlet profiles are the 1/4 of complete circular arc, radius is 100-350mm with the back pressure mould with bending guide plate,
Arc entrance cavity plate working surface has been evenly arranged 3-8 roll shaft per side along the direction of motion, 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 the inner surface precompressed of forging middle part
Detent matches, and the back pressure mould is arranged inside concave die cavity, and surface machined surface profile and forging middle part outside is not thereon
Bending area shape matches, and it is the 0.15-0.25 times of constant backpressure of bending force that lower end is connected with hydraulic cylinder and provides size, 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 drift with base, and the base is provided with pad with the cavity plate dovetail other end
Film trap, and the pad that thickness is 1.0mm to the maximum is pre-installed in brand-new die assembly, 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 expansion is 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 be the detent of 4-6mm and insertion forging width；
B. by the trimming on preheated shaving die of above-mentioned forging blank, trimming is used and the non-trimming profile phase of forging main body
The back pressure mould matched somebody with somebody, back pressure is 0.3-0.5 times of trimming power；
C. the waste heat blank after trimming is placed into arc entrance cavity plate top immediately, by back pressure mould and two connected 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 drives punch-pin to stress on forging blank, coordinates back pressure hydraulic cylinder piston rod along the slight of forging horizontal direction
Shake completion positioning bar is engaged and compression with detent, and it is accurate fixed forging blank is brought into close contact realization with back pressure mould
Position；
D. forcing press drives punch-pin to continue to push, and bending guide plate is carried out with hinge as rotary shaft with the process of pushing, along cavity plate arc
Entrance trajectory drive forging crooked position carries out continuous bending deformation, continuous bending mistake after forging reaches predetermined angle of bend
Journey terminates；
E. forcing press drives punch-pin backhaul, and arcuately track is moved and launches to reply to rise the dynamic bending guide plate of back pressure modular belt with punch-pin
To horizontality, forging demoulding simultaneously obtain having needed for angle of bend forging finished product.
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 be 15-40mm, the surface that roll shaft is contacted with bending guide plate be reserved with depth be 8-10mm
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 with 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 preferably used
Hot die steel is simultaneously aided with Surface hardening treatment, it is ensured 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 guide plate connects with back pressure mould
The hinge fit tolerance for connecing 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 is
Non-circular cross sections, preferably square cross section.
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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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| CN108188215A (en) * | 2017-11-30 | 2018-06-22 | 江苏华电铁塔制造有限公司 | A kind of sheet material bending mould |
| CN108480438A (en) * | 2018-04-08 | 2018-09-04 | 安徽机电职业技术学院 | A kind of sheet material bending device |
| CN108637150A (en) * | 2018-04-14 | 2018-10-12 | 青岛鑫隆恒达五金制品有限公司 | A kind of former, production line and the production technology of high-precision high-strength shackle |
| CN108838683A (en) * | 2018-07-18 | 2018-11-20 | 乐清市中雁机械制造有限公司 | Full-automatic curve Bending Processing equipment |
| CN108927474A (en) * | 2018-06-13 | 2018-12-04 | 陕西长羽航空装备有限公司 | A kind of bending and molding method of crotch forging |
| CN109500156A (en) * | 2018-12-28 | 2019-03-22 | 天津航天长征火箭制造有限公司 | Grid siding bend molding apparatus and method in a kind of high muscle thickness rate |
| CN111992596A (en) * | 2020-07-15 | 2020-11-27 | 张少康 | Radian bending device capable of accurately adjusting angle and used for machining electric heating type steel plate |
| CN112588904A (en) * | 2020-11-27 | 2021-04-02 | 贵州航天新力科技有限公司 | Forge piece bending die and bending process |
| CN113182968A (en) * | 2021-05-11 | 2021-07-30 | 刘春燕 | Aluminum alloy section bar system of processing |
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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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| CN108188215A (en) * | 2017-11-30 | 2018-06-22 | 江苏华电铁塔制造有限公司 | A kind of sheet material bending mould |
| CN108480438A (en) * | 2018-04-08 | 2018-09-04 | 安徽机电职业技术学院 | A kind of sheet material bending device |
| CN108480438B (en) * | 2018-04-08 | 2019-11-26 | 陈守树 | A kind of sheet material bending device |
| CN108637150A (en) * | 2018-04-14 | 2018-10-12 | 青岛鑫隆恒达五金制品有限公司 | A kind of former, production line and the production technology of high-precision high-strength shackle |
| CN108637150B (en) * | 2018-04-14 | 2019-12-06 | 青岛鑫隆恒达五金制品有限公司 | forming equipment, production line and production process of high-precision and high-strength shackle |
| CN108927474A (en) * | 2018-06-13 | 2018-12-04 | 陕西长羽航空装备有限公司 | A kind of bending and molding method of crotch forging |
| CN108838683A (en) * | 2018-07-18 | 2018-11-20 | 乐清市中雁机械制造有限公司 | Full-automatic curve Bending Processing equipment |
| CN108838683B (en) * | 2018-07-18 | 2023-07-28 | 浙江中雁机械制造有限公司 | Full-automatic curve bending processing equipment |
| CN109500156A (en) * | 2018-12-28 | 2019-03-22 | 天津航天长征火箭制造有限公司 | Grid siding bend molding apparatus and method in a kind of high muscle thickness rate |
| CN111992596A (en) * | 2020-07-15 | 2020-11-27 | 张少康 | Radian bending device capable of accurately adjusting angle and used for machining electric heating type steel plate |
| CN112588904A (en) * | 2020-11-27 | 2021-04-02 | 贵州航天新力科技有限公司 | Forge piece bending die and bending process |
| CN113182968A (en) * | 2021-05-11 | 2021-07-30 | 刘春燕 | Aluminum alloy section bar system of processing |
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