CN109530472A - A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled - Google Patents
A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled Download PDFInfo
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- CN109530472A CN109530472A CN201910080139.4A CN201910080139A CN109530472A CN 109530472 A CN109530472 A CN 109530472A CN 201910080139 A CN201910080139 A CN 201910080139A CN 109530472 A CN109530472 A CN 109530472A
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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
- B21C25/02—Dies
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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
- B21C23/02—Making uncoated products
- B21C23/03—Making uncoated products by both direct and backward extrusion
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Abstract
A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled disclosed by the invention, this method is related to a kind of closely contour chevron light-alloy component mold for extruding and forming of thin-walled, which includes upper mold component, lower die assembly, liftout attachment, filling device, fixation and movable component；Upper mold component, lower die assembly, liftout attachment constitute drip molding external annulus channel, corner channel and drip molding internal ring wall channel, this method includes the first passage extrusion molding and the second passage extrusion molding, first passage shapes bottom and the external annulus of chevron part, then dnockout, demoulding, ejection by corner channel and external annulus channel pressings；Second passage shapes the internal ring wall of chevron part by internal ring wall channel pressings.The present invention realizes the precision plastic forming of the nearly contour complicated chevron component of thin-walled, effectively overcomes the problems, such as that traditional processing manufactures die strip, improves the formability of light-alloy, improve the comprehensive mechanical property of formed parts, greatly improve stock utilization, energy-saving.
Description
Technical field
The present invention relates to metal material plastic processing and forming technique field, in particular to a kind of closely contour chevron of thin-walled is light
Alloy components 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, thin-walled is close etc.
(the closely contour chevron component of thin-walled refers to integrated member for inside loop and outside loop wall composition, internal ring wall and outer ring to high chevron light-alloy component
Wall wall is thin and height is close to flushing) in every field using more and more extensive.Such as have the guided missile and satellite capsule of double walled housing
Section, double-walled chevron component is had on ocean action Drive, application has double-walled shape on a variety of equipments such as caterpillar
Complex forging etc..It is no lack of the presence there are many closely contour formula part of dual thin wall in chevron part, these part shapes are complicated, matter
Amount requires height, and the place that geometrical stress is concentrated is also stress position the most severe, and traditional shaping dies passes through and such as casts
Or the different degrees of presence casting bubble of the product that produces of mode of machining, shrinkage cavity, processing cost height, waste of resource etc.
Defect and deficiency not only degraded performance but also are not able to satisfy the service demand of product.
Summary of the invention
For existing processing technology status, the present invention proposes to realize that thin-walled is close using Warm Extrusion corner channel formation technology
The precision plastic forming of contour complexity chevron component.Purpose is that existing traditional processing manufacture mold bring is effectively overcome to ask
Topic, improves the formability of light-alloy, improves the comprehensive mechanical property of formed parts, greatly improve stock utilization, energy-saving.
To achieve the goals above, technical scheme is as follows:
A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled, this method are related to a kind of closely contour chevron of thin-walled
Light-alloy component mold for extruding and forming, the mold include upper mold component, lower die assembly, liftout attachment, filling device, fixation
And movable component；The upper mold component includes that punch-pin retainer plate and interchangeable first passage punch-pin and the second passage are convex
Mould；The lower die assembly includes cavity plate and interchangeable intermediate cavity plate and mandrel；When the upper mold component assembles first
When passage punch-pin, the cavity plate is corresponding to install intermediate cavity plate, described recessed when the upper mold component assembles the second passage punch-pin
The corresponding installation mandrel of mould, and exchanged by the assembly method of intermediate cavity plate and intermediate cavity plate；The intermediate punch-pin opens up placement blank
Discharging channel, cavity plate center has inner cavity, and the intermediate cavity plate lower section extends lower ring wall to inner cavity；The mandrel has in
Between the identical discharging channel of cavity plate and lower ring wall；Inverse-T-shaped sliding slot is equipped with above the cavity plate；The liftout attachment includes jacking block
And mandril；The fixation and movable component include umbrella crown, straight pin, fixed block, hang erbium and chain；Umbrella crown surface slope and
Jacking block gradient is consistent, and the intermediate cavity plate and punch-pin retainer plate form the latch groove communicated, punch-pin retainer plate lower part and
Mandrel top, which is respectively provided with, hangs erbium；The external surface shape of the first passage punch-pin lower end is cylindric, the second passage punch-pin
The external surface shape of lower end is identical with the inner wall shape of drip molding internal ring wall；The lower ring wall of the intermediate cavity plate and mandrel is respectively single
Drip molding external annulus channel is solely constituted with cavity plate, and constitutes corner channel with jacking block top；The second passage punch-pin and core
Ring wall constitutes drip molding internal ring wall channel under axis；
This method includes the first passage extrusion molding and the second passage extrusion molding, step are as follows:
First passage extrusion molding:
(1) prepare before forming: blank bottom is processed into a bellmouth identical with umbrella crown size, squeezed with the first passage
Compression mould is integrally preheated and is kept the temperature；The first passage extrusion die assembly after preheating insulation is mounted on press machine；To first it consolidate
Determine the inverse-T-shaped sliding slot that block promotes cavity plate upper end, fixes intermediate cavity plate, preheated blank is then placed on discharging channel
It is interior；
(2) forming process: upper mold component moves downward, and the first passage punch-pin, which starts to press against blank, to be walked downwards, and blank exists
Under the action of first passage punch-pin pressure, by the deformation in two stages:
First is that radial jumping-up and bottom stage, blank bottom are located on umbrella crown, the lower part of blank is logical along corner
Road enters drip molding external annulus channel, until the bottom of forming chevron part；
Second is that the shaping stage of chevron part external annulus, as the first passage punch-pin continues to be pressed down against, blank will be by turning
Corner channel is gone successively in external annulus channel, and external annulus height increases, until external annulus height reaches requirement, is completed outside chevron part
Ring wall extrusion molding；
(3) after the completion of squeezing: stopping the first passage punch-pin and move downward, fixed block exits inverse-T-shaped sliding slot, in latch groove
Plugging straight pin fixes intermediate cavity plate with extrusion, and the first passage punch-pin moves back up, drives intermediate cavity plate and squeezes
Part rises together, and is risen using filling device limitation extrusion and complete the first passage dnockout, demoulding, and extrusion falls into cavity plate
Interior, extrusion is ejected cavity plate by liftout attachment at this time, and staff's folder walks extrusion and removes umbrella crown；
Second passage extrusion molding:
(1) prepare before forming: the extrusion of the first passage extrusion molding heated and kept the temperature with the second passage extrusion die,
The second passage extrusion die after preheating insulation is mounted on press machine；First extrusion is put into cavity plate, will first hang erbium extension
Upper chain, upper mold component downwards put back to mandrel in cavity plate, then remove chain and fix mandrel；
(2) forming process: upper mold component moves downward, and the second passage punch-pin touches pre- among when the first passage squeezes
Start to squeeze when staying Partial flats, the second passage punch-pin continues to move downward, extrusion along the second passage punch-pin appearance towards
On grow tall, until internal ring wall height reaches requirement；
(3) after the completion of squeezing: stopping moving downward for the second passage punch-pin, then erbium will be hung and hang up chain, the second passage is convex
Mould starts to move back up, and press machine upper table band moving mandrel and blank are walked upwards, and is squeezed using filling device limitation
Part, which rises, completes the second passage dnockout, demoulding；Extrusion is fallen into cavity plate, and extrusion is ejected cavity plate, work by liftout attachment at this time
Make personnel's folder to walk extrusion and remove umbrella crown, light-alloy chevron part, which squeezes, to be completed.
After adopting the above scheme, the beneficial effects of the present invention are:
1. because ring wall can collectively form the passway in corner channel under umbrella crown, jacking block and intermediate cavity plate, add
Between under cavity plate ring wall and cavity plate constitute drip molding external annulus channel, it is possible to by control technological parameter (such as umbrella crown and
The gradient of ring wall and bottom transition band fillet under the gradient of jacking block, intermediate cavity plate) come change blank by passway into
Enter the stress condition in channel pressings deformation process, it is ensured that blank does not occur cracking and in the process to ring under intermediate cavity plate
Wall, which generates excessive impact force, makes its deformation, preferably controls metal stresses state, equivalent strain amount, plastic deformation and even tissue
Property etc., ensure that the smooth forming of light-alloy chevron part external annulus, meet the final of light-alloy chevron part external annulus and bottom
Size and performance requirement.
2. the ingenious precision plastic forming for realizing the nearly contour complicated chevron component of thin-walled using corner channel formation technology
While, the control of Wall-Thickness Difference when ensure that external annulus forming occurs axial unstability and is squeezed into when blank being prevented to be pressed down against
Facilitate taking-up extrusion after shape；It also ensures the distance not influenced between inside and outside ring wall when shaping internal ring wall and facilitates taking-up most
The light-alloy chevron part of whole extrusion molding.
3. using warm-extrusion forming technology, extruding force is substantially reduced compared with cold extrusion, while ensure that near-net-shape
Also ensure that the comprehensive mechanical property of material is optimal.
4. cooperating detachable the first passage punch-pin, the second passage punch-pin, intermediate cavity plate and mandrel, it is only necessary to replace the
One, the second passage punch-pin and intermediate structures such as cavity plate and mandrel can carry out the chevron part of different wall thickness or drum is squeezed into
Shape improves the utilization rate of mold.
Further, the lower die assembly further includes limit film, and limit film is placed on intermediate cavity plate after being put into blank
At discharging channel mouth, when the first passage punch-pin moves downward, limit film is taken down when touching blank upper surface.
Further, prepare to further include in first for will contacting with blank before the forming of the first passage extrusion molding
Secondary male bottom, cavity plate inner cavity, umbrella crown, jacking block surface and intermediate molding surface uniformly spray colloidal graphite mixed with water.
Further, prepare to further include in the second that will be contacted with blank before the forming of the second passage extrusion molding
Secondary convex mould surface, cavity plate inner wall and mandrel surface uniformly spray colloidal graphite mixed with water.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Detailed description of the invention
Fig. 1 is the first passage mold overall structure cross-sectional view in embodiment provided by the present invention；
Fig. 2 is the second passage mold overall structure cross-sectional view in embodiment provided by the present invention；
Fig. 3 is mold work state section view when blank is put by the first passage before squeezing in embodiment provided by the present invention
Figure；
Fig. 4 is the first passage blank mold work state cross-sectional view when to be extruded in embodiment provided by the present invention；
Fig. 5 is that blank is cutd open in radial jumping-up and bottom stage mold work state in embodiment provided by the present invention
View；
Fig. 6 is that blank is cutd open in the shaping stage mold work state of chevron part external annulus in embodiment provided by the present invention
View；
Fig. 7 is that first passage squeezes demoulding working state schematic representation after the completion in embodiment provided by the present invention；
Fig. 8 is blank in embodiment provided by the present invention in chevron part internal ring wall shaping stage mold work state section view
Figure；
Fig. 9 is that the second passage punch-pin demoulds working condition after the completion of the extruding of second passage in embodiment provided by the present invention
Schematic diagram；
Figure 10 is that second passage extruding completion rear mandrel stripper makees status diagram in embodiment provided by the present invention；
Figure 11 is the first passage punch structure schematic diagram in embodiment provided by the present invention；
Figure 12 is the second passage punch structure schematic diagram in embodiment provided by the present invention；
Figure 13 is cavity die structure cross-sectional view in embodiment provided by the present invention；
Figure 14 is intermediate cavity die structure schematic diagram in embodiment provided by the present invention；
Figure 15 is core shaft structure cross-sectional view in embodiment provided by the present invention；
Figure 16 is umbrella crown and ejecting block cross-sectional view in embodiment provided by the present invention；
Figure 17 is the blank schematic diagram in embodiment provided by the present invention before extrusion molding；
Figure 18 is the chevron part schematic diagram in embodiment provided by the present invention after extrusion molding.
Label declaration
1-mandril；2-lower templates；3-lower die hexagon socket cap head screws；4-jacking blocks；5-umbrella crowns；6-cavity plates；7—
Intermediate cavity plate；Cavity plate discharging channel among 71-；Ring wall under cavity plate among 72-；8-fixed blocks；9-the first passage punch-pin；10—
Punch-pin retainer plate；11-upper mold hexagon socket cap head screws；12-cope plates；13-limit films；14-straight pins；15-dnockouts
Plate；16-mandrels；161- mandrel discharging channel；Ring wall under 162- mandrel；17-hang erbium；18-chains；19-the second passage is convex
Mould；20- drip molding external annulus channel；21- corner channel；22- drip molding internal ring wall channel.
Specific embodiment
A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled that the present invention discloses, refering to fig. 1-18, including
The upper mold component that is connect with the superstructure of press machine, the lower die assembly being connect with press machine substructure, liftout attachment,
Filling device, fixation and movable component.
As depicted in figs. 1 and 2, the upper mold component include the cope plate 12 being connect with the upper table of press machine, with
The punch-pin retainer plate 10 and interchangeable first passage punch-pin 9 and the second passage punch-pin 19 that cope plate connects；Described first
Secondary 9 lower end of punch-pin passes through among punch-pin retainer plate 10, and 9 upper end of the first passage punch-pin and punch-pin retainer plate 10 are assemblied in one
It rises, punch-pin retainer plate 10 is assemblied in cope plate 12 by upper mold hexagon socket head cap screw 11, and cope plate 12 is assemblied in pressure with fastening bolt
Power machine upper table (not shown)；The second passage punch-pin 19 presses the assembly method and the first passage of the first passage punch-pin
Punch-pin 9 exchanges.
As depicted in figs. 1 and 2, the lower die assembly includes the lower template 2 connecting with press machine lower table, cavity plate 6
And interchangeable intermediate cavity plate 7 and mandrel 16；The cavity plate 6 is assemblied in lower template 2 by lower die hexagon socket head cap screw 3, described
Lower template 2 be assemblied in press machine lower table (not shown) with fastening bolt.6 center of cavity plate has inner cavity, when described
When upper mold component assembles the first passage punch-pin 9, the cavity plate 6 is corresponding to install intermediate cavity plate 7, it is preferable that the intermediate cavity plate 7
Outer surface forms boss, and boss is together with the card slot clearance fit for passing through certain depth above cavity plate inner cavity, the mandrel 16
Also have and the identical boss of intermediate cavity plate 7；When the upper mold component assembles the second passage punch-pin 19, the cavity plate 6 is right
Mandrel 16 should be installed, and exchanged by the assembly method of intermediate cavity plate and intermediate cavity plate 7；The intermediate punch-pin 7 opens up placement blank
Discharging channel 71, and 71 diameter of discharging channel is greater than blank diameter, and the intermediate cavity plate lower section extends lower ring wall 72 to inner cavity；
The mandrel has and the intermediate identical discharging channel 161 of cavity plate and lower ring wall 162；For Optimize the forming scheme lines and it is conducive to de-
Fillet is formed on 72,162 bottom of lower ring wall of mould, the intermediate cavity plate and mandrel, it is preferable that the lower ring wall 72 of the intermediate cavity plate
Bottom also has gradient.
As shown in Figure 1, the liftout attachment includes jacking block 4 and mandril 1；Jacking block 4 is put by the inner cavity of cavity plate 6 and and lower die
Plate 2 contacts, and 4 upper surface of jacking block has gradient, the cavity radius clearance fit and formation transition corner of jacking block 4 and cavity plate 6；Top
Bar 1 and 2 clearance fit of lower template, and it is set to 4 bottom of jacking block；
As depicted in figs. 1 and 2, the filling device includes knockout plate 15, is set above the cavity plate 6 there are four inverse-T-shaped
Sliding slot, knockout plate slide in inverse-T-shaped sliding slot, promote when needing dnockout and complete dnockout, release, unload when not needing, when the
When two passage 19 extrusion billets of punch-pin, knockout plate 15 can be promoted with fixed central spindle 16, as shown in Figure 8；
As depicted in figs. 1 and 2, the fixation and movable component include umbrella crown 5, straight pin 14, fixed block 8, limit film
13, erbium 17 and chain 18 are hung；Umbrella crown 5 is placed on jacking block 4, and umbrella handle is formed on 5 bottom of umbrella crown, opens up hole for hoist, umbrella at the top of jacking block 4
Cap 5 is inserted into hole for hoist by umbrella handle and is fixed on 4 on jacking block, is played positioning action and is changed blank flow direction reduction blank pair
The impact force of ring wall 72 under intermediate cavity plate；5 upper surface of umbrella crown has and the consistent gradient of jacking block 4；Before the first passage dnockout,
It needing intermediate cavity plate 7 as punch-pin 9 rises together, the intermediate cavity plate 7 and punch-pin retainer plate 10 form the latch groove communicated,
When the first passage punch-pin 9, which declines, to be squeezed, straight pin 14 is cooperated in insertion latch groove, so that intermediate cavity plate 7 and punch-pin are fixed
Circle 10 is fixed together, so that intermediate cavity plate 7 rises together with the first passage punch-pin 9.
Before the second passage dnockout, mandrel 16 is needed to rise with the second passage punch-pin 19, when under the second passage punch-pin 19
When drop squeezes, 10 lower part of punch-pin retainer plate and 16 top of mandrel keep mandrel 16 solid by hanging to be hung up between erbium 17 with chain 18
Fixed second passage punch-pin 19, so that mandrel 16 rises with the second passage punch-pin 19；When the first passage 9 extrusion billet of punch-pin,
Fixed block 8 is pushed into when the first passage is shaped by the inverse-T-shaped sliding slot above cavity plate 6, and the work of fixed intermediate cavity plate 7 is played
With；Limit film 13 is placed at 17 mouthfuls of discharging channel of intermediate cavity plate after being put into blank, plays position-limiting action.
The external surface shape of first passage punch-pin, 9 lower end be it is cylindric, 19 lower end of the second passage punch-pin it is outer
Surface shape is identical with the inner wall shape of drip molding internal ring wall；The lower ring wall 162 of the intermediate cavity plate 7 and mandrel respectively individually with
Cavity plate 6 constitutes drip molding external annulus channel 20, and constitutes corner channel 21 with jacking block top；Second passage punch-pin, 19 He
Ring wall 162 constitutes drip molding internal ring wall channel 22 under mandrel.
Nowadays light-alloy using more for Al alloys andMg alloys, so we take brief description for aluminium alloy below,
A kind of closely contour chevron light-alloy component extrusion forming method of thin-walled, including the first passage extrusion molding and the second passage are squeezed into
Shape, step include:
First passage extrusion molding:
(1) prepare before forming: blank bottom being processed into a bellmouth identical with umbrella crown size, is heated to 470 DEG C
And 12h is kept the temperature, and the first above-mentioned passage extrusion die is integrally preheated to 480 DEG C and is kept the temperature；By first after preheating insulation
Passage extrusion die is mounted on press machine according to assembly relation described in Fig. 1.
With reference to Fig. 3 and Fig. 4, will be contacted with blank 9 bottom of punch-pin, 6 inner cavity of cavity plate, umbrella crown 5,4 surface of jacking block and
Colloidal graphite mixed with water is uniformly sprayed on intermediate 7 surface of cavity plate, promotes 6 upper end of cavity plate inverse-T-shaped from surrounding fixed block 8 at this time
Sliding slot fixes intermediate cavity plate 7, then preheated blank is placed in intermediate cavity plate 7, and put limit film 13.
(2) forming process: referring to Fig. 4, Fig. 5 and Fig. 6, and press machine drives cope plate 12, the punch-pin of upper mold component to fix
Circle 10 and the first passage punch-pin 9 move downward, and limit film 13 is taken down when touching blank upper surface, and the first passage punch-pin 9 starts
It is pressing against blank to walk downwards, since blank diameter and intermediate 7 interior diameter of cavity plate have a difference, and 20 knot of drip molding external annulus channel
The composition of structure, so blank is under the action of the first passage 9 pressure of punch-pin, by the deformation in two stages:
First is that radial jumping-up and bottom stage, blank have a slight upsetting under the action of the first passage punch-pin 9
Thick process, blank bottom are located on umbrella crown 5, and as shown in figure 15,5 surface slope of umbrella crown is consistent with 4 gradient of jacking block to be
25 °, punch-pin 9 moves downward, and is in and puts while the lower part of blank enters drip molding external annulus channel 20 along corner channel 21
Blank diameter in material channel 71 gradually reaches the diameter of discharging channel 71, only flows downward when blank diameter is not in variation,
And the bottom that chevron part will be shaped；
Second is that the shaping stage of chevron part external annulus, as press machine drives the first passage punch-pin 9 to continue to be pressed down against, base
Material is full of jacking block 4 is formed by region with 6 bottom of cavity plate on last stage, at this time blank will by corner channel 21 after
Continuous to enter in external annulus channel 20, as shown in figure 13, there is a fillet of R8 in 72 bottom end of ring wall under intermediate cavity plate, in external annulus channel 20
Constantly squeezing into blank causes external annulus height to increase, until external annulus height reaches requirement, completes chevron part external annulus and is squeezed into
Shape.
(3) after the completion of squeezing: as shown in fig. 7, stopping moving downward for press machine upper table, exiting four fixations at this time
Block 8 plugs four straight pins 14 in the latch groove that intermediate 7 top of cavity plate is matched with punch-pin retainer plate 10, at this time press machine
Upper table moves back up, and intermediate cavity plate 7 is driven to rise together with extrusion, from 6 card slot of cavity plate in the middle part of intermediate cavity plate 7
After out, knockout plate 15 is pushed into from inverse-T-shaped sliding slot, prevents to squeeze after knockout plate 15 touches the external annulus of extrusion
Part rises, and press machine upper table continues to rise, and as shown in figure 13, ring wall 72 is gradient and the R8 for having 2 ° under intermediate cavity plate
Fillet, thus by extrusion and mould separating, upper table rises to always vertex, and extrusion can be fallen into after mold separation
In cavity plate 6, liftout tank is risen at this time and pushes mandril 1 and jacking block 4 that extrusion is ejected cavity plate 6, staff's folder walks extrusion simultaneously
Remove umbrella crown 5.
Second passage extrusion molding:
(1) prepare before forming: the extrusion of the first passage extrusion molding being heated to 470 DEG C and is kept the temperature, and will be above-mentioned
Second passage extrusion die is integrally preheated to 480 DEG C and keeps the temperature, by the mold after preheating insulation according to assembly relation described in Fig. 2
It is mounted on press machine.
With reference to Fig. 8, Figure 12 and Figure 14, colloidal graphite mixed with water first is sprayed on 19 surface of the first passage punch-pin, then upper work
Make platform and the erbium 17 that hangs between punch-pin retainer plate 10 and mandrel 16 is hung up into chain 18 down to certain distance, upper table rises one
Set a distance takes up mandrel 16 and prepares for spray lubricant, equal in 6 inner wall of cavity plate that will be contacted with extrusion and 16 surface of mandrel
Even sprays colloidal graphite mixed with water, and 6 inner wall of cavity plate sprays less, and 16 surface of mandrel is sprayed more, after having sprayed lubricant；It will be preheated
Extrusion is put into cavity plate 6, and upper table downwards puts back to mandrel 16 in 6 card slot of cavity plate, takes down chain 18 and by knockout plate 15
It is pushed into inverse-T-shaped sliding slot and fixes mandrel 16.
(2) forming process: referring to Fig. 8 and Figure 11, and press machine drives cope plate 12, the punch-pin retainer plate 10 of upper mold component
It is moved downward with the second passage punch-pin 19, when the second passage punch-pin 19 touches reserved part platform among when the first passage squeezes
Start to squeeze, the second passage punch-pin 19 continues to move downward, and extrusion is tilted along 19 bottom first part of the second passage punch-pin
Degree α is that 4 ° of skew wall grows tall upwards, when press machine continues to move downward, extrusion by having the transition rotary table of R6, along
Gradient β is that 4 ° of upper skew wall continues to grow tall, until the second passage punch-pin 19 moves to stroke end stopping；In whole process,
External annulus can also increase certain altitude but not be very big.
(3) after the completion of squeezing: referring to Fig. 9, Figure 10 and Figure 14, stop moving downward for press machine upper table, press machine
Upper table moves back up, is detached from the second passage punch-pin 19 from extrusion, completes the second passage punch-pin 19 and is detached from；So
It arrives certain distance still further below afterwards to hang up chain 18 and exit knockout plate 15, press machine upper table band moving mandrel 16 and blank are upward
It walks, is pushed into knockout plate 15 when mandrel 16 is increased beyond inverse-T-shaped sliding slot, when knockout plate 15 touches the external annulus of extrusion
It prevents extrusion from rising afterwards, completes the disengaging between extrusion and mandrel 16, upper table is risen into highest point then liftout tank
Push mandril 1 and jacking block 4 that chevron extrusion is ejected cavity plate 6, staff takes out extrusion and removes umbrella crown 5, light-alloy mountain
The laborsaving extruding of shape part is completed.
Difficulties for forming of the invention is first is that such as how labour-saving mode shapes inside loop and outside loop wall and guarantees the wall finally shaped
Thick uniformity consistency, second is that being to prevent axial generation unstability when the first passage blank extrusion molding and guaranteeing the second passage inner wall
Spacing distance when forming between inside loop and outside loop wall is unaffected and is easy to the placement and taking-up of blank.
For first difficulties for forming, the present invention successively shapes two ring walls in outer using corner passage technology and two passages
Method overcomes.The forming of external annulus is first realized with corner channel, then passes through backward extrusion internal ring wall, mold convex-concave again
The forming face of mould can largely reduce forming force according to one optimal forming curve of corresponding part drawing optimization.
Drip molding external annulus channel internal diameter is consistent the uniform wall thickness consistency that can be very good to guarantee external annulus, in backward extrusion
Internal ring wall uniform wall thickness consistency can be guaranteed by carrying out accurate limit to punch-pin when ring wall.For second difficulties for forming, this hair
Bright have that certain difference reaches reasonable cooperation and discharging channel height is sufficiently high using discharging channel diameter and blank diameter,
Guarantee that blank safe can be pressed down against, when the second passage punch-pin squeezes inner wall, the present invention is used and intermediate female bottom is complete
To separate internal ring wall and external annulus, reaching does not influence interval distance between inside and outside ring wall for complete the same mandrel and cavity plate clearance fit
From purpose, intermediate cavity plate and mandrel are movable up and down, it is possible to easily take out very much extrusion.
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 (4)
1. a kind of closely contour chevron light-alloy component extrusion forming method of thin-walled, it is light that this method is related to a kind of closely contour chevron of thin-walled
Alloy components mold for extruding and forming, the mold include upper mold component, lower die assembly, liftout attachment, filling device, it is fixed with
And movable component；The upper mold component includes that punch-pin retainer plate and interchangeable first passage punch-pin and the second passage are convex
Mould；The lower die assembly includes cavity plate and interchangeable intermediate cavity plate and mandrel；When the upper mold component assembles first
When passage punch-pin, the cavity plate is corresponding to install intermediate cavity plate, described recessed when the upper mold component assembles the second passage punch-pin
The corresponding installation mandrel of mould, and exchanged by the assembly method of intermediate cavity plate and intermediate cavity plate；The intermediate punch-pin opens up placement blank
Discharging channel, cavity plate center has inner cavity, and the intermediate cavity plate lower section extends lower ring wall to inner cavity；The mandrel has in
Between the identical discharging channel of cavity plate and lower ring wall；Inverse-T-shaped sliding slot is equipped with above the cavity plate；The liftout attachment includes jacking block
And mandril；The fixation and movable component include umbrella crown, straight pin, fixed block, hang erbium and chain；Umbrella crown surface slope and
Jacking block gradient is consistent, and the intermediate cavity plate and punch-pin retainer plate form the latch groove communicated, punch-pin retainer plate lower part and
Mandrel top, which is respectively provided with, hangs erbium；The external surface shape of the first passage punch-pin lower end is cylindric, the second passage punch-pin
The external surface shape of lower end is identical with the inner wall shape of drip molding internal ring wall；The lower ring wall of the intermediate cavity plate and mandrel is respectively single
Drip molding external annulus channel is solely constituted with cavity plate, and constitutes corner channel with jacking block top；The second passage punch-pin and core
Ring wall constitutes drip molding internal ring wall channel under axis；
This method includes the first passage extrusion molding and the second passage extrusion molding, step are as follows:
First passage extrusion molding:
(1) prepare before forming: blank bottom being processed into a bellmouth identical with umbrella crown size, with the first passage extrusion die
Tool is whole to be preheated and keeps the temperature；The first passage extrusion die assembly after preheating insulation is mounted on press machine；First by fixed block
The inverse-T-shaped sliding slot for promoting cavity plate upper end, fixes intermediate cavity plate, then preheated blank is placed in discharging channel；
(2) forming process: upper mold component moves downward, and the first passage punch-pin, which starts to press against blank, to be walked downwards, and blank is first
Under the action of passage punch-pin pressure, by the deformation in two stages:
First is that radial jumping-up and bottom stage, blank bottom are located on umbrella crown, the lower part of blank along corner channel into
Enter drip molding external annulus channel, until the bottom of forming chevron part；
Second is that the shaping stage of chevron part external annulus, as the first passage punch-pin continues to be pressed down against, blank will be led to by corner
Road is gone successively in external annulus channel, and external annulus height increases, until external annulus height reaches requirement, completes chevron part external annulus
Extrusion molding；
(3) after the completion of squeezing: stopping the first passage punch-pin and move downward, fixed block exits inverse-T-shaped sliding slot, plugs in latch groove
Straight pin fixes intermediate cavity plate with extrusion, and the first passage punch-pin moves back up, drives intermediate cavity plate and extrusion one
It rising and rises, and risen using filling device limitation extrusion and complete the first passage dnockout, demoulding, extrusion is fallen into cavity plate, this
When liftout attachment extrusion ejected into cavity plate, staff's folder walks extrusion and removes umbrella crown；
Second passage extrusion molding:
(1) prepare before forming: the extrusion of the first passage extrusion molding is heated and kept the temperature with the second passage extrusion die, it will be pre-
The second passage extrusion die after heat heat preservation is mounted on press machine；First extrusion is put into cavity plate, erbium will be first hung and hang up chain
Son, upper mold component downwards put back to mandrel in cavity plate, then remove chain and fix mandrel；
(2) forming process: upper mold component moves downward, and the second passage punch-pin touches among when the first passage squeezes and reserves portion
Start to squeeze when dividing platform, the second passage punch-pin continues to move downward, and extrusion is grown upwardly along the second passage punch-pin appearance
Height, until internal ring wall height reaches requirement；
(3) after the completion of squeezing: stopping moving downward for the second passage punch-pin, then erbium will be hung and hang up chain, the second passage punch-pin is opened
Beginning moves back up, and press machine upper table band moving mandrel and blank are walked upwards, and using on filling device limitation extrusion
It rises and completes the second passage dnockout, demoulding；Extrusion is fallen into cavity plate, and extrusion is ejected cavity plate by liftout attachment at this time, and work people
Member's folder walks extrusion and removes umbrella crown, and light-alloy chevron part, which squeezes, to be completed.
2. a kind of closely contour chevron light-alloy component extrusion forming method of thin-walled as described in claim 1, it is characterised in that: institute
Stating lower die assembly further includes limit film, and limit film is placed at the discharging channel mouth of intermediate cavity plate after being put into blank, when
A time punch-pin moves downward, and takes down limit film when touching blank upper surface.
3. a kind of closely contour chevron light-alloy component extrusion forming method of thin-walled as described in claim 1, it is characterised in that: institute
It states and prepares before the forming of the first passage extrusion molding to further include in the first passage male bottom that will be contacted with blank, in cavity plate
Chamber, umbrella crown, jacking block surface and intermediate molding surface uniformly spray colloidal graphite mixed with water.
4. a kind of closely contour chevron light-alloy component extrusion forming method of thin-walled as described in claim 1, it is characterised in that: institute
It states and prepares before the forming of the second passage extrusion molding to further include in the second passage convex mould surface that will be contacted with blank, in cavity plate
Wall and mandrel surface uniformly spray colloidal graphite mixed with water.
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| CN112692088A (en) * | 2020-12-23 | 2021-04-23 | 北京航星机器制造有限公司 | Barrel component hot extrusion die and forming method |
| CN114054656A (en) * | 2021-11-15 | 2022-02-18 | 中北大学 | Extrusion forming method for special-shaped box body with large projection area |
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