CN109396208A - A kind of steel different wall thickness " H " shape connector synchronization extrusion forming method - Google Patents
A kind of steel different wall thickness " H " shape connector synchronization extrusion forming method Download PDFInfo
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- CN109396208A CN109396208A CN201811538536.3A CN201811538536A CN109396208A CN 109396208 A CN109396208 A CN 109396208A CN 201811538536 A CN201811538536 A CN 201811538536A CN 109396208 A CN109396208 A CN 109396208A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/08—Dies or mandrels with section variable during extruding, e.g. for making tapered work; Controlling variation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
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Abstract
A kind of steel different wall thickness " H " shape connector disclosed by the invention synchronizes extrusion forming method, this method is related to a kind of steel different wall thickness " H " shape connector synchronization mold for extruding and forming, the mold includes upper mold component, lower die assembly and guiding and liftout attachment component；It is exported after three deformation processes and final forming when preheated mold and blank and then concave-convex mold squeeze before this method experience shapes.The present invention realizes the precision plastic forming of different wall thickness " H " shape connector using Warm Extrusion synchronous forming, purpose is effectively to overcome the problems, such as brought by existing traditional processing manufacturing method, improve the formability of alloy, improve the comprehensive mechanical property of drip molding, greatly improve stock utilization and production efficiency, energy-saving and emission-reduction.
Description
Technical field
The invention belongs to metal material plastic processing and forming technique field, in particular to a kind of steel different wall thickness " H "
Shape connector synchronizes extrusion forming method.
Background technique
With China's aeronautical and space technology, new- and high-tech weaponry and equipment and the fast development of ocean development, different wall thickness
" H " shape connector (referring to workpiece inner hollow up and down, there are spaced walls for centre, and upper and lower two walls wall thickness is different) is each in the army and the people
A field using more and more extensive.Such as in the guided missile warhead of weaponry, the connection at the positions such as aircraft, automobile to be all kinds of
The junction of different-diameter pipes is also seen everywhere in daily life." H " shape inside parts can have different degrees of step and recessed
Angle and wall is thin, traditional manufacturing process will such as be welded among two " u "-shaped parts, cast the either most common machinery
The mode manufactured parts of processing.The defects of weldment can have different degrees of weld cracking, shrinkage cavity and be fallen off at soldered,
And many material welding performances are bad；Casting equally exists not fine and close cast structure, shrinkage cavity and bubble and crystal grain thickness
It is uneven etc.；Simple machining production efficiency is low, waste of raw materials is serious and takes time and effort.Existing for these methods not
In place of foot and it is difficult to meet this part service demand.
The difficulties for forming of such part is first is that be also to prevent wall of cup in axial hair while different wall thickness forming up and down
Raw unstability, second is that the uniformity consistency and lower wall of the wall thickness that guarantee finally shapes are relatively thin will to be easy to take out and remain intact constantly
It splits.
Summary of the invention
For existing processing technology status, the present invention proposes that a kind of steel different wall thickness " H " shape connector synchronizes and is squeezed into
Shape method realizes the precision plastic forming of different wall thickness " H " shape connector using Warm Extrusion synchronous forming, it is therefore intended that effectively
Overcome the problems, such as to improve the formability of alloy brought by existing traditional processing manufacturing method, improves the synthesis mechanical property of drip molding
Can, greatly improve stock utilization and production efficiency, energy-saving and emission-reduction.
To achieve the goals above, technical scheme is as follows:
A kind of steel different wall thickness " H " shape connector synchronization extrusion forming method, this method are related to a kind of steel difference wall
Thick " H " shape connector synchronizes mold for extruding and forming, which includes the upper mold component connecting with the top of press machine, with pressure
The lower die assembly of the lower part connection of machine, and guiding and liftout attachment component；The upper mold component includes and press machine
The cope plate of upper table connection, the mold insert to connect with cope plate and upper mold pedestal, the punch-pin to connect with the mold insert and upper mold
Cage plate, and the bung flange and back pieces ring that connect with the upper mold pedestal；The lower die assembly includes the lower work with press machine
The bottom core and cavity plate of platform connection；The inside of the cavity plate forms inward flange, and the bottom core and punch-pin form knuckle and inclination
Degree；The guiding and liftout attachment component include mandril, bottom plate and pull rod, this method specifically:
(1) forming before prepare: by blank preheating and even application colloidal graphite mixed with water, punch-pin, back pieces ring, cavity plate and
The surface of bottom core is uniformly smeared colloidal graphite mixed with water and is preheated, and after preheating, places the blanks on the core of bottom, cope plate
It moves downward, while pull rod declines, mandril and the decline of bottom core, bottom core return to female bottom blank and also arrive pre-extrusion position, prepare
Extrusion molding；
(2) forming process: press machine drives upper mold component to move downward, and punch-pin, which touches blank, to be continued to be pressed down against,
With being pressed down against for punch-pin, back pieces ring can also be entered in cavity plate, and blank is under the action of punch-pin, the change of experienced three stages
Shape:
First is that " H " blank shaping stage, when just starting to squeeze, blank is limited by the inward flange of cavity plate, the diameter that blank is subject to
It is greater than to resistance axial, is first flowed into bottom core and concave die cavity, bottom core ribbon has that the gradient the bigger toward the smaller resistance of down space,
Radial resistant force is less than axially blank at this time, causes the effect aggravation of blank jumping-up, blank is full of cavity plate inward flange part and along convex
The inclined wall of mould moves upwards, and shows " H " pre- shape；
Second is that on " H " lower wall build phase, with press machine drive punch-pin continue to be pressed down against, punch-pin work belt is up
With the presence of gradient, space of the punch-pin compared with the space between cavity plate between bottom core and cavity plate will greatly, therefore the resistance of upper part
Power is less than the resistance of lower part, and the material of lower part is also to walk from top to bottom, so the growth rate of upper wall height is wanted
It is radial at this time to fill in cavity plate greater than lower wall, so this stage does not increase compared to radial on last stage, only up and down
The height growth of two walls can touch back pieces ring bottom when upper wall rises to certain altitude, upper lower wall has been completed axis at this time
It is shaped to increasing；
Third is that " H " full shaping stage, press machine continues to be pressed down against blank with punch-pin, and " H " shape is substantially complete at this time
At upper wall has not arrived final height and lower wall base angle difficulty formation zone and do not complete final forming also, and back pieces ring at this time is
Upper wall has been touched, has had certain height cooperation between back pieces ring and bung flange, when punch-pin continues decline, upper wall pushes back pieces ring
It moving upwards, stops rising when back pieces ring touches upper mold cage plate, punch-pin, back pieces ring and cavity plate form closo chamber at this time,
The unique flow direction of blank is lower wall base angle difficulty formation zone, fills and completes along with downward impact force base angle, completes to squeeze eventually
Forming；
(3) after the completion of extrusion molding: stopping moving downward for press machine upper table, press machine upper table is back up
Movement drives punch-pin to rise and is simultaneously detached from workpiece upper wall, and with the rising of punch-pin, back pieces ring automatically falls off a distance, and convex
Mould is detached from；Pull rod is driven to rise during cope plate rises, pull rod drives bottom plate to rise simultaneously, and bottom plate rises certain distance
Mandril is contacted afterwards and bottom core is driven to head on workpiece climbs away cavity plate together, meeting automatic spring cavity plate after workpiece break away from moulds, most
After remove workpiece, extrusion forming is completed.
Preferably, the gradient of the bottom core is 10 °.
Preferably, the gradient of the punch-pin is 12 °.
After adopting the above scheme, the beneficial effects of the present invention are:
1, punch-pin, cavity plate and bottom core together constitute the shaped cavity of " H " shape connector, by control technological parameter (at
The gradient of shape inner cavity each section, intermediate zone fillet) change stress condition of " H " the shape part in extrusion process used for forming, it is ensured that
Two walls increase and the smooth realization of whole shaping stage shaping stage up and down, preferably control metal stresses state, equivalent strain
Amount, plastic deformation and structural homogenity etc., ensure that forming is gone on smoothly, meet " H " shape connector final size and performance
It is required that；
2, back pieces ring cooperation guiding and liftout attachment component.The back pieces ring for having positioning and guiding to act on, is transported downwards in press machine
In dynamic process, back pieces ring can both play the role of position punch-pin in turn ensure whole shaping stage lower wall difficulty formation zone it is good at
Shape, and play workpiece one on the other in back pieces stage cooperation reverse drawing rod structure and smoothly demould；Reverse drawing rod-type linkage ejecting structure
It can be matched on any press machine and use, press machine liftout tank is not required, considerably increase the applicability of extrusion die, subtract
Production cost is lacked；
3, using warm-extrusion forming technology, extruding force is greatly reduced compared with cold extrusion, while guaranteeing near-net-shape
Ensure that the comprehensive mechanical property of material is optimal.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention into
Row is further described.
Detailed description of the invention
Fig. 1 is mold overall structure cross-sectional view when not being put into blank in embodiment provided by the present invention；
Fig. 2 is guiding and liftout attachment assemble cross-section in embodiment provided by the present invention；
Fig. 3 is mold work state cross-sectional view when being put into blank before extrusion molding in embodiment provided by the present invention；
Fig. 4 is blank mold work state cross-sectional view when to be extruded in embodiment provided by the present invention；
Fig. 5 shapes deformation stage mold work state section view in " H " blank for blank in embodiment provided by the present invention
Figure；
Fig. 6 is blank lower wall build phase mold work state cross-sectional view on " H " in embodiment provided by the present invention；
Fig. 7 is that blank is squeezing whole shaping stage mold work state cross-sectional view in embodiment provided by the present invention；
Fig. 8 is embodiment convex mould structural schematic diagram provided by the present invention；
Fig. 9 is cavity die structure cross-sectional view in embodiment provided by the present invention；
Figure 10 is embodiment indsole cored structure schematic diagram provided by the present invention；
Figure 11 is back pieces ring structure cross-sectional view in embodiment provided by the present invention；
Figure 12 is the blank schematic diagram in embodiment provided by the present invention before extrusion molding；
Figure 13 is " H " shape connector schematic diagram in embodiment provided by the present invention after extrusion molding.
Label declaration:
1- lower template；2- lower die hexagon socket cap head screw；3- lower die straight pin；4- lower mold backing plate；5- mandril；6- is led
Column；7- lower die hexagon socket cap head screw；The bottom 8- core；9- lower die support plate；10- pressing sleeve；11- tightens set；12- cavity plate；13- is convex
Mould；14- back pieces ring；15- bung flange；16- guide sleeve；17- upper mold pedestal；18- cope plate；19- upper mold straight pin；20- mold insert；21-
Upper mold registering；22- upper mold hexagon socket cap head screw；23- spring washer；24- hex nut；25- bottom plate；26- pull rod；27-
Sleeve；28- nut；29- connecting rod；30- hex nut；31- inward flange；32- knuckle.
Specific embodiment
A kind of synchronous extrusion forming method of steel different wall thickness " H " shape connector that the present invention discloses, this method are related to one
The synchronous mold for extruding and forming of kind steel different wall thickness " H " shape connector, refering to fig. 1-13, which includes the top with press machine
The upper mold component of connection, the lower die assembly being connect with press machine lower part and guiding and liftout attachment component.
As shown in Figure 1, shown upper mold component includes: the cope plate 18 connecting with the upper table of press machine, with upper mold
The mold insert 20 and upper mold pedestal 17 that plate 18 connects, the punch-pin 13 and upper mold cage plate 21 to connect with mold insert 20, and with upper mold pedestal
17 bung flanges 15 and back pieces ring 14 to connect.The mold insert 20 is built in upper mold pedestal 17, and 15 ring set of bung flange is at upper mold bottom
The lower section of seat 17, the punch-pin 13 pass through upper mold pedestal 17 and bung flange 15, and the upper mold cage plate 21 is placed in upper mold pedestal 17 and convex
Between mould 13, the back pieces ring 14 is placed between bung flange 15 and punch-pin 13.More specifically, the punch-pin 13, upper mold cage plate 21
It is fitted together with mold insert 20 by clearance fit, back pieces ring 14, which is put into bung flange 15, passes through fastening thread and upper mold across punch-pin 13
Pedestal 17 connects together.The upper mold pedestal 17 and cope plate 18 passes through again later by the way that upper mold straight pin 19 is circumferentially positioned
The upper mold hexagon socket cap head screw 22 for being placed with spring washer 23 is assembled together.The cope plate 18 fastening bolt (figure
In be not shown) be assemblied in the upper table of press machine.
As shown in Figure 1, the lower die assembly includes: lower template 1, the lower mold backing plate connecting with the lower table of press machine
4, lower die support plate 9, bottom core 8, pressing sleeve 10, tighten set 11 and cavity plate 12.The lower template 1, lower mold backing plate 4 and lower die support plate
9 place from bottom to up, the lower template 1, lower mold backing plate 4 and lower die support plate 9 by lower die straight pin 3 it is circumferentially positioned after,
Lower mould bottom plate 1 is assembled together with lower mold backing plate 4 by lower die hexagon socket cap head screw 2, lower mold backing plate 4 and lower die support plate
9 are assembled together by lower die hexagon socket cap head screw 7.The cavity plate 12 is nested with above bottom core 8, in conjunction with Fig. 8, Fig. 9, figure
Shown in 10, the inside of the cavity plate 12 forms inward flange 31, the bottom core 8 and punch-pin 13 formed knuckle 32 and gradient α,
β.The lower template 1 and lower mold backing plate 4 open up the sliding slot communicated with core slot, plant for mandril 5, as shown in connection with fig. 10, on mandril 5
Splaying cooperates bottom core 8, and 5 lower end of mandril can be by 25 support of bottom plate.The centre of the lower die support plate 9 opens up core slot, the bottom
Core 8 is put into core slot and its clearance fit, card slot cooperation of the cavity plate 12 by 9 upper end of lower die support plate corresponding thereto
Together, the set 11 that tightens is combined together by corresponding card slot with cavity plate 12, and the pressing sleeve 10 passes through corresponding card slot
Cooperation is tightening outside set, together with pressing sleeve 10 and lower die support plate 9 are tightly coupled by fastening thread.The lower template 1
The lower table of press machine is assemblied in fastening bolt.The lower die assembly further includes knockout plate, jacking block；The jacking block
It is connected together with mandril 5 by screw threads for fastening mode, and has corresponding recesses in cavity plate 12 and lower template 1, positioning is risen to jacking block
Effect；Knockout plate is T shape key, there is corresponding cooperation T-slot on cavity plate 12.
As depicted in figs. 1 and 2, the guiding and liftout attachment component include guide post 6, guide sleeve 16, mandril 5, bottom plate 25,
Pull rod 26, sleeve 27 and connecting rod 29.The guide post 6 is mounted on cope plate 18, and the guide sleeve 16 is mounted on lower template 1, guide post 6
It is cooperatively connected with guide sleeve 16, guide post 6 and guide sleeve 16 play the role of lead between cope plate 18 and lower template 1.Mandril 5 is loading
It has been installed when die assembly, lower end is by 25 support of bottom plate, and bottom plate 25 is fixed on 26 lower end of pull rod by hex nut 24, is drawn
Bar 26 passes through the through-hole on lower mold 1 and is connected by sleeve 27 with connecting rod 29, can be by adjusting nut 28 come adjusting yoke
About 26 distance, connecting rod 29 are fixed on cope plate 18 by hex nut 30.When cope plate 18 moves downward, pull rod
26 drop to mandril 5 together to complete to squeeze, when squeezing is finished cope plate 18 rise, 26 support of pull rod mandril 5 will squeeze
Casting die, which jacks up, to be come, and takes extrusion to facilitate.
A kind of synchronous extrusion forming method of steel different wall thickness " H " shape connector, below we take make for 45 steel it is brief
Explanation, step specifically:
(1) prepare before shaping: it is to 200 DEG C and equal that 45 rod iron material are put into tubular type electricity frequency induction heater first low-temperature heat
Even spraying colloidal graphite mixed with water, is heated to 950 DEG C；Mold is mounted on press machine by assembly relation described in Fig. 1；Recessed
The preheated mold bar heated is placed inside and outside model cavity and uniformly around punch-pin carry out preheated mold.
With reference to Fig. 3, in punch-pin 13,14 bottom of back pieces ring, wall-shaped chamber and the bottom core 8 in cavity plate 12 that will be contacted with steel shape part
Surface uniformly smear colloidal graphite mixed with water, to mold preheating after, place the blanks on bottom core 8.After completion, this
When cope plate 18 move downward, while pull rod 26 declines, and mandril 5 and bottom core 8 decline automatically, and bottom core 8 returns to 12 bottom base of cavity plate
Material also arrives pre-extrusion position, as shown in figure 4, preparing extrusion molding.
(2) forming process: referring to Fig. 5, Fig. 6 and Fig. 7, press machine drive the cope plate 18 of upper mold component, mold insert 20, on
Die sleeve version 21, upper mold pedestal 17 and punch-pin 13 and back pieces ring 14 move downward, and punch-pin 13, which touches blank, to be continued to be pressed down against, with
Being pressed down against for punch-pin 13, back pieces ring 14 can also enter in cavity plate 12, and certain positioning action can be played to punch-pin 13.
Since punch-pin 13 is provided with gradient α, cavity plate 12 has inward flange 31, and bottom core 8 has knuckle 32 and gradient β, such as schemes
8, shown in Fig. 9 and Figure 10, so blank is under the action of punch-pin 13, the deformation of experienced three stages:
First is that " H " blank shaping stage, with reference to Fig. 5 and Fig. 9, when just starting to squeeze, blank is limited by the inward flange 31 of cavity plate
System, the Radial resistant force that blank is subject to are greater than axially, first to bottom core 8 and the intracavitary flowing of 12 type of cavity plate, since bottom core 8 inclines with 10 °
The gradient the bigger toward the smaller resistance of down space, and Radial resistant force is less than axially blank at this time, causes the effect aggravation of blank jumping-up, blank
It moves upwards full of 31 part of cavity plate inward flange and along the inclined wall of punch-pin 13, shows " H " pre- shape；
Second is that on " H " lower wall build phase, as shown in Figure 6 and Figure 8, with press machine drive punch-pin 13 continue downwards squeeze
Pressure, 13 work belt of punch-pin is up with the presence of 12 ° of gradients, punch-pin 13 bottom core 8 and cavity plate 12 compared with the space between cavity plate 12
Between space will greatly, therefore the resistance of upper part is less than the resistance of lower part, and the material of lower part is also from top to bottom
It walks, so the growth rate of upper wall height is greater than lower wall, it is radial at this time to fill in cavity plate 12, so this stage phase
Compared with not increasing radially on last stage, only the height growth of upper and lower two walls, can touch when upper wall rises to certain altitude and move back
14 bottom of part ring, upper lower wall has been completed that axial increase shapes at this time；
Third is that " H " full shaping stage, as shown in fig. 7, press machine continues to be pressed down against blank with punch-pin 13, at this time
" H " shape is basically completed, and upper wall has not arrived final height and lower wall base angle difficulty formation zone and do not complete final forming also, at this time
Back pieces ring 14 touched upper wall, have certain height cooperation between back pieces ring 14 and bung flange 15, when punch-pin 13 continues
When decline, upper wall pushes back pieces ring 14 and moves upwards, and stops rising when back pieces ring 14 touches upper mold cage plate 21, at this time punch-pin
13, back pieces ring 14 and cavity plate 12 form closo chamber, and the unique flow direction of blank is lower wall base angle difficulty formation zone, along with downward
Impact force base angle fill complete, complete squeeze eventually forming.
(3) after the completion of extrusion molding: stopping moving downward for press bench, press machine upper table is transported back up
It is dynamic, drive punch-pin 13 to rise and be detached from workpiece upper wall, even if not automatically disengaging once in a while, with the rising of punch-pin 13, back pieces ring
14 can automatically fall off a distance due to gravity without the pressure on top, and a downward impact force can be played to workpiece makes work
Part and punch-pin 13 are detached from；It will drive pull rod 26 during cope plate 18 rises to rise, pull rod 26 drives on bottom plate 25 simultaneously
It rises, bottom plate 25 contacts mandril 5 after rising certain distance and drives bottom core 8 to head on workpiece to climb away cavity plate 12 together, entire to squeeze
Press process time very short, meeting automatic spring cavity plate 12 after workpiece break away from moulds smoothly easily can smoothly remove workpiece, extrusion
Forming is completed.
Compared with prior art, the present invention having following technical effect that
1. punch-pin 13, cavity plate 12 and bottom core 8 together constitute the shaped cavity of " H " shape connector, pass through control technique ginseng
Count (gradient of shaped cavity each section, knuckle) to change stress condition of " H " the shape part in extrusion process used for forming, really
Having protected shaping stage, two walls increase and the smooth realization of whole shaping stage up and down, preferably control metal stresses state, etc. effects
Variable, plastic deformation and structural homogenity etc. ensure that forming is gone on smoothly, and meet " H " shape connector final size and property
It can require；
2. back pieces ring cooperation guiding and liftout attachment component.The back pieces ring 14 for thering is positioning and guiding to act on, it is downward in press machine
During movement, back pieces ring 14 can both play the role of positioning punch-pin 13 and in turn ensure whole shaping stage lower wall difficulty formation zone
Good forming, and play workpiece one on the other in back pieces stage cooperation reverse drawing rod structure and smoothly demould；Reverse drawing rod-type linkage top
Structure can be matched on any press machine and use out, not require press machine liftout tank, considerably increase the suitable of extrusion die
With property, reduce production cost；
3. using warm-extrusion forming technology, extruding force is greatly reduced compared with cold extrusion, while guaranteeing near-net-shape
Ensure that the comprehensive mechanical property of material is optimal.
It should be noted that this case uses the cavity plate 12 for having inward flange 31 and has specific for first difficulties for forming
The punch-pin 13 and bottom core 8 of gradient α, β and knuckle 32 overcomes.The forming face of cavity plate 12, punch-pin 13 and bottom core 8 can basis
The inward flange 31 of the optimal forming curve cooperation cavity plate 12 of corresponding optimization one, part drawing can both prevent wall of cup axial direction unstability
Lower wall in the intact forming of energy again.For second difficulties for forming, this case using band back pieces ring 14 on punch-pin 13, in conjunction with guiding and
Liftout attachment component realizes that the linkage ejection of reverse drawing rod-type is overcome.The back pieces ring 14 of band and punch-pin 13 enter together on punch-pin 13
Good positioning action can be played in cavity plate 12, and in final shaping stage back pieces ring 14 and 12,13 structure of punch and matrix to cup
Wall forms three-dimensional compressive stress, both can guarantee the uniformity consistency of wall thickness or can play certain supplement to the intact forming of lower wall and makees
With.Back pieces ring cooperation guiding and liftout attachment component can play the role of facilitating feeding, the mold design clever structure, reliable
Property it is good, forming accuracy is high.
The above is only specific embodiments of the present invention, not to the restriction of protection scope of the present invention.All setting according to this case
The equivalent variations that meter thinking is done, each falls within the protection scope of this case.
Claims (3)
1. a kind of synchronous extrusion forming method of steel different wall thickness " H " shape connector, this method are related to a kind of steel different wall thickness
" H " shape connector synchronizes mold for extruding and forming, which includes the upper mold component connecting with the top of press machine, with press machine
Lower part connection lower die assembly, and guiding and liftout attachment component；The upper mold component includes upper with press machine
The cope plate of workbench connection, the mold insert to connect with cope plate and upper mold pedestal, the punch-pin and Upper Die-sleeve to connect with the mold insert
Plate, and the bung flange and back pieces ring that connect with the upper mold pedestal；The lower die assembly includes the lower table with press machine
The bottom core and cavity plate of connection；The inside of the cavity plate forms inward flange, and the bottom core and punch-pin form knuckle and gradient；
The guiding and liftout attachment component include mandril, bottom plate and pull rod, this method specifically:
(1) prepare before forming: by blank preheating and even application colloidal graphite mixed with water, in punch-pin, back pieces ring, cavity plate and bottom core
Surface uniformly smear colloidal graphite mixed with water and preheat, after preheating, place the blanks on the core of bottom, cope plate is downward
Movement, while pull rod declines, mandril and the decline of bottom core, bottom core return to female bottom blank and also arrive pre-extrusion position, prepare to squeeze
Forming；
(2) forming process: press machine drives upper mold component to move downward, and punch-pin, which touches blank, to be continued to be pressed down against, with
Punch-pin is pressed down against, and back pieces ring can also enter in cavity plate, and blank is under the action of punch-pin, the deformation of experienced three stages:
First is that " H " blank shaping stage, when just starting to squeeze, blank is limited by the inward flange of cavity plate, the radial resistance that blank is subject to
Power is greater than axial, first flows into bottom core and concave die cavity, and bottom core ribbon has that the gradient the bigger toward the smaller resistance of down space, blank
Radial resistant force is less than axial at this time, causes the effect aggravation of blank jumping-up, blank is full of cavity plate inward flange part and along punch-pin
Inclined wall moves upwards, and shows " H " pre- shape；
Second is that on " H " lower wall build phase, with press machine drive punch-pin continue to be pressed down against, punch-pin work belt, which up has, inclines
Gradient exists, and space of the punch-pin compared with the space between cavity plate between bottom core and cavity plate will greatly, therefore the resistance of upper part is wanted
Material less than the resistance of lower part, and lower part is also to walk from top to bottom, so the growth rate of upper wall height is greater than
Lower wall, it is radial at this time to fill in cavity plate, so this stage does not increase compared to radial on last stage, only two walls up and down
Height growth, back pieces ring bottom can be touched when upper wall rises to certain altitude, upper lower wall has been completed axial increasing at this time
Long forming；
Third is that " H " full shaping stage, press machine continues to be pressed down against blank with punch-pin, and " H " shape is basically completed at this time, on
Wall has not arrived final height and lower wall base angle difficulty formation zone and does not complete final forming also, and back pieces ring at this time has touched
Upper wall has certain height cooperation between back pieces ring and bung flange, when punch-pin continues decline, upper wall pushes transports on back pieces circumferential direction
It is dynamic, stop rising when back pieces ring touches upper mold cage plate, punch-pin, back pieces ring and cavity plate form closo chamber at this time, and blank is only
One flow direction is lower wall base angle difficulty formation zone, fills and completes along with downward impact force base angle, completes to squeeze forming eventually；
(3) after the completion of extrusion molding: stopping moving downward for press machine upper table, press machine upper table is transported back up
It is dynamic, drive punch-pin to rise and be detached from workpiece upper wall, with the rising of punch-pin, back pieces ring automatically falls off a distance, with punch-pin
It is detached from；Pull rod is driven to rise during cope plate rises, pull rod drives bottom plate to rise simultaneously, after bottom plate rises certain distance
It contacts mandril and bottom core is driven to head on workpiece and climb away cavity plate together, meeting automatic spring cavity plate after workpiece break away from moulds, finally
Workpiece is removed, extrusion forming is completed.
2. a kind of steel different wall thickness " H " shape connector as described in claim 1 synchronizes extrusion forming method, feature exists
In: the gradient of the bottom core is 10 °.
3. a kind of steel different wall thickness " H " shape connector as described in claim 1 synchronizes extrusion forming method, feature exists
In: the gradient of the punch-pin is 12 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811538536.3A CN109396208B (en) | 2018-12-03 | 2018-12-03 | Synchronous extrusion forming method for steel H-shaped connecting pieces with different wall thicknesses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811538536.3A CN109396208B (en) | 2018-12-03 | 2018-12-03 | Synchronous extrusion forming method for steel H-shaped connecting pieces with different wall thicknesses |
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| Publication Number | Publication Date |
|---|---|
| CN109396208A true CN109396208A (en) | 2019-03-01 |
| CN109396208B CN109396208B (en) | 2020-01-03 |
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| CN201811538536.3A Active CN109396208B (en) | 2018-12-03 | 2018-12-03 | Synchronous extrusion forming method for steel H-shaped connecting pieces with different wall thicknesses |
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| CN113020516A (en) * | 2021-04-01 | 2021-06-25 | 湘潭大学 | Method and die for forging unequal-thickness metal piece plate with flange structure |
| CN113070399A (en) * | 2021-03-23 | 2021-07-06 | 中北大学 | A terrace die reposition of redundant personnel discharge apparatus that is used for Gleeble-3500 testing machine extrusion to press |
| CN113084006A (en) * | 2021-04-02 | 2021-07-09 | 中北大学 | Step-by-step extrusion die capable of effectively reducing box forming load |
| CN113814287A (en) * | 2021-10-11 | 2021-12-21 | 中北大学 | Precise warm extrusion forming method of steel anchoring flange and steel anchoring flange |
| CN117345752A (en) * | 2023-10-26 | 2024-01-05 | 东方蓝天钛金科技有限公司 | Lightweight self-locking nut for aerospace, cold extrusion die and forming method |
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| CN113814287A (en) * | 2021-10-11 | 2021-12-21 | 中北大学 | Precise warm extrusion forming method of steel anchoring flange and steel anchoring flange |
| CN113814287B (en) * | 2021-10-11 | 2023-07-28 | 中北大学 | Precise warm extrusion forming method for steel anchoring flange and steel anchoring flange |
| CN117345752A (en) * | 2023-10-26 | 2024-01-05 | 东方蓝天钛金科技有限公司 | Lightweight self-locking nut for aerospace, cold extrusion die and forming method |
| CN117345752B (en) * | 2023-10-26 | 2024-05-14 | 东方蓝天钛金科技有限公司 | Lightweight self-locking nut for aerospace, cold extrusion die and forming method |
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