CN102615268A - Antigravity squeeze casting device of aluminum alloy connecting rod and manufacture method - Google Patents
Antigravity squeeze casting device of aluminum alloy connecting rod and manufacture method Download PDFInfo
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- CN102615268A CN102615268A CN2012101111892A CN201210111189A CN102615268A CN 102615268 A CN102615268 A CN 102615268A CN 2012101111892 A CN2012101111892 A CN 2012101111892A CN 201210111189 A CN201210111189 A CN 201210111189A CN 102615268 A CN102615268 A CN 102615268A
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Abstract
The invention relates to a method and a mould using an antigravity squeeze casting process to manufacture an aluminum alloy connecting rod, and particularly relates to a manufacturing method and a mould of a splitting type aluminum connecting rod. The technical scheme is that suitable foils are imbedded in the mould in advance, aluminum melting liquid is filled in to form a shape in a squeeze casting mode, the aluminum liquid enters a cavity from bottom to top through bypassing and controlling of a bypass flow cone pair, and liquid levels on two sides of the foils synchronously rise to enable a splitting interface to form inside a casting of the connecting rod. A screw mechanism is arranged on the mould, and a gap between joint surfaces of a body cavity of the connecting rod and a cover cavity of the connecting rod to bring convenience in foil placing and changing. The device and the method guarantee that the splitting interface formed when the connecting rod is cast in a pre-breaking area of a big head of the connecting rod, avoid defects of crack branching or splitting surface excursion and the like in a follow-up splitting manufacture process of the connecting rod, enable the castings to be free of entrapped air, cold shut and insufficient pouring, tight in organization and capable of conducting heat treatment, and enable mechanical property and mechanical behavior to be obviously improved.
Description
Technical field
The invention belongs to and adopt Extrution casting technique to prepare the part technical field, particularly a kind of antigravity extrusion casting method and die device of aluminum alloy connecting rod.
Background technology
Connecting rod is as one of key components and parts of engine; Be formed by connecting with bolt gonnecting rod body and connecting rod cap; Mainly bear high frequency alternate loads such as the burning stretching that explosive force and reciprocal inertia force produced, compression, bending in its course of work; Condition of work is abominable, and motion state is complicated, and fatigue, wearing and tearing, vibrations etc. influence the service life of connecting rod.Therefore, require connecting rod should have higher intensity and anti-fatigue performance, have enough rigidity and toughness again.
Many in recent years scientific workers have proposed multiple alloy liquid forming technique, like high pressure casting, low pressure casting method (containing gravitational casting).High pressure casting is with high-voltage high-speed the moulding that cooling and shaping in the mould die cavity is accomplished goods to be gone in the liquid alloy injection through die casting machine; Its filling velocity is fast, but it is bad often to occur exhaust in the injection process, alloy liquid volume gas; Make foundry goods organize gassiness; And cold shut is arranged, owe defective such as casting, cause the mechanical performance of goods to reduce, can not heat-treat.Low pressure casting method is hot liquid alloy injection to be got in the die cavity of mould with low pressure low speed through die casting machine, and cooling and shaping is accomplished the moulding of goods, and its filling velocity is slow; Time is long, and die venting is more abundant, and the air content of foundry goods reduces; But the cooled and solidified process pressure of foundry goods is not enough; Make tissue looseness, crystal grain is thick, and mechanical performance is lower.
At present, the processing of domestic aluminum alloy connecting rod depends on the traditional mechanical processing mode, is gonnecting rod body, connecting rod cap two parts with the sawing of monolithic linkage blank earlier, adopts both involutory surfaces of grinding method processing again.This manufacturing procedure is various, inefficiency, and receive location precision, the connecting rod bearing capacity and the assembly precision of manufacturing receive considerable restraint.Abroad, adopted PM technique, semisolid forming technique to make aluminum alloy connecting rod.U.S. Patent number: US20020148325A1 has proposed employing semisolid forming technique and has made cracking type aluminum alloy connecting rod.The Piston Rods Die moulding was injected in extruding after this patent proposed aluminium alloy with special component and is made into the semisolid raw material; The follow-up obdurability of regulating aluminum alloy connecting rod through quenching heat treatment, artificial aging; Make it at ambient temperature can brittle fracture, satisfy the requirement of connecting rod cracking processing.It exists following not enough: the complicated process of preparation of semi-solid aluminium alloy raw material; With high costs; Excessive or the too small obdurability that all influences connecting rod of crystal grain that its cooling back forms; Follow-up heat treatment is complicated to the connecting rod Effect on Performance, the connecting rod cracking is added be prone to major part man-hour to tear, split not open, fall problems such as slag, plane of disruption distortion.
By " extrusion casint of ADC12 aluminum alloy connecting rod " that Tang Quanbo, Jiang Jufu etc. delivers, Special Processes of Metal Castings and non-ferrous alloy, 2006; 30 (7), the aluminum alloy connecting rod that direct pressing method forms has been proposed, the aluminum connecting rod crystalline structure made from the method is very fine and smooth; It is higher not have loose, surface quality and mechanical property, but has following shortcoming: the quantity that 1) pours into aluminum melt in the die cavity with temperature control want tight, consider that aluminum melt volume contraction after pushing, solidifying asks complicacy; Otherwise the forming dimension of connecting rod blank do not reach specification requirement or because of aluminum melt few; And make metal structure loose, thereby product percent of pass is low, it is high that operating technology requires; 2) owing to before pouring into a mould the back, beginning pressurization, liquid metal liquid freely crusts at wedge angle or the formation of place, narrow chamber easily, freely crusts to be squeezed and break in the back of pressurizeing, and molten metal is wrapped in it wherein, the easy bark pocket that forms.
Antigravity extrusion casint is a kind of casting, forges few smear metal or the chipless technology be integrated, and liquid alloy is filled die cavity through the squeezing action of pressure head with low flow velocity, big flow, when treating that molten metal is in accurate solid phase area, continues extruded alloy and carries out high pressure and force feeding.Defectives such as this method has overcome the defective that high pressure casting is involved in gas and oxidizing slag easily, has effectively improved the not enough and tissue looseness that causes of low pressure casting method freezing pressure, and crystal grain is thick.In addition, under hot pressing condition, it is fine and close that foil that cracking is used and molten metal react formed fused interface; All volume defects of interface internal are able to flatten; The oxide that near interface generates binds through diffusion and matrix material, thereby, in connecting rod blank, form desirable cracking interface; To improve the connecting rod lysis efficiency, guarantee the cracking quality.
Summary of the invention
The manufacturing approach and the mould that the purpose of this invention is to provide a kind of cracking type aluminum alloy connecting rod blank; Solve to adopt the operation that exists in the traditional mechanical processing aluminum alloy connecting rod technology various, problem such as stock utilization is low, the machine tool investment is big, cutter and energy consumption are many.
The present invention places cracking material in advance in mold cavity; Get into the molten metal of die cavity through fan-shaped running channel and the reasonable distribution of dividing flow cone; The molten metal of foil both sides is risen synchronously; Molten metal is to the impact of foil, the cracking interface that in the cut section that connecting rod is scheduled to, forms after the cooling in the minimizing cavity filling process.During the subsequent implementation cracking technology, connecting rod can avoid occurring defectives such as crack branching or the skew of cracking face along prefabricated cracking interfacial fracture subdivision
A kind of mould that utilizes the antigravity Extrution casting technique to make aluminum alloy connecting rod comprises patrix one, counterdie one, patrix two, counterdie two, top mold frame, following mould bases, divides flow cone, snap ring, sprue bush, liquid material cylinder, pressure head, screw mandrel, pull bar, push rod, upper molded plate, counterdie backing plate, die shank; Mold cavity is made up of gonnecting rod body die cavity and connecting rod cap die cavity; With the vertical involutory surface of connecting rod cap die cavity (22) place boss face and the curved cavity that cooperatively interacts is set at gonnecting rod body die cavity (29); The boss face height is slightly less than the cavity degree of depth 0.02 ~ 0.25 ㎜; Boss face cooperates with curved cavity during matched moulds; The patrix one that is nested in the top mold frame is accurately located with patrix two, the counterdie one that is nested in down in the mould bases is accurately located with counterdie two, the gap that matched moulds rear boss face and cavity constitute is used to place foil; Following mould bases and top mold frame both sides are provided with wedge-shaped slot, and wedge is fixed on the die shoe by screw, and the wedge outer edge side is equipped with rolling wheel; Counterdie backing plate end near the connecting rod cap die cavity is provided with screw mandrel, can the connecting rod cap casting mold that patrix two and counterdie two are formed be moved along the screw mandrel axis direction through regulating screw mandrel, changes the spacing between the involutory surface of two die cavities; At the vertical-parting basifacial of gonnecting rod body die cavity and connecting rod cap die cavity liquid material cylinder is installed, said liquid material cylinder is not for there being the top cylindrical tubular structure at the no end, and its top is communicated with liquid material chamber with sprue bush presses the chamber, and the bottom cooperates the cylinder pressure head of steel; Press the top, chamber that the branch flow cone is installed; Said minute flow cone is cylinder table stepped column body, involuted by two semicylinders, and wherein half sheet divides the bottom of flow cone at the gonnecting rod body die cavity; Half sheet divides the bottom of flow cone at the connecting rod cap die cavity in addition; And the position is corresponding each other, divides the flow cone both sides that two independently fan-shaped running channels are arranged, and is communicated with gonnecting rod body die cavity and connecting rod cap die cavity respectively; During installation snap ring is embedded the collar that divides the flow cone bottom, be fixedly clamped with the counterdie backing plate through counterdie one, counterdie two; Mould emptier is set on the upper molded plate, and pull bar and push rod upper end are fixed on the knockout plate, and the pull bar lower end is provided with the shaft shoulder, and restriction knockout plate and push rod moves upward during the demoulding.
Said screw mandrel can move the connecting rod cap casting mold along the screw mandrel axis direction, be used for regulating the spacing between gonnecting rod body casting mold and the connecting rod cap casting mold, is convenient in this gap, install or change foil before the casting; Following mould bases and top mold frame both sides are provided with wedge-shaped slot, and wedge embeds and to be installed in the wedge-shaped slot, are fixed on the die shoe by screw, and utilize the fixing foil of wedging power between the two; The wedge outer edge side is equipped with rolling wheel, during casting subsequent use foil is placed on the rolling wheel in advance.When foil is installed, paste high temperature gummed tape in foil band upper edge earlier, to increase foil band strength and toughness, realize during production foil continuously, the conveying of not cutting off.
The operation principle of mould and process: mould is with horizontal parting, and the center line that die joint is arranged on connecting rod part is the position on the lower side, and injection device is arranged under the vertical mating surface of gonnecting rod body die cavity and connecting rod cap die cavity.This mould is by two independently hydraulic cylinder operation work; During the mould matched moulds; Die shank descend to drive patrix one, patrix two moves downward and matched moulds, position through pull bar and alignment pin, and through presetting the foil clamping that is fixed behind the screw mandrel adjusting connecting rod cap casting mold position.During production, earlier alloy liquid is quantitatively poured in the liquid material cylinder, hydraulic cylinder upwards promotes pressure head and moves with certain speed under the hydraulic press; Liquid alloy liquid gets into die cavity through fan-shaped running channel; After type to be filled finished, pressure head continues to apply to be suppressed, and made the crystallization and freezing moulding under the high specific pressure condition of alloy liquid.During die sinking, earlier leading screw is adjusted to rational position, die shank drives patrix one, patrix two moves upward, and foundry goods heads on push rod, and knockout plate and pull bar are moved upward together.Pull bar rises behind the segment distance, because the restriction of counterdie backing plate, knockout plate and pull bar all no longer move upward with die shank.Like this, when die shank drove patrix continuation rising, push rod was just made squeeze casting from die cavity.
The antigravity extrusion casting method of aluminum alloy connecting rod of the present invention, processing step is followed successively by: preheated mold, apply releasing agent, preset foil, matched moulds, low pressure fill type, extrusion modling, die sinking pickup, heat treatment;
(1) preheated mold: with mould and die preheating to 150 ~ 250 degree centigrade;
(2) wall of die cavity spary releasing agent, and in gap 13, place the foil that is used for the connecting rod cracking, matched moulds then;
(3) low pressure is filled type: quantitatively be poured into aluminum alloy melt in the liquid material cylinder, steadily push through pressure head low speed, aluminum melt is filled with die cavity through the antigravity direction with stable flow velocity, and the aluminium alloy pouring temperature is 650 ~ 720 degrees centigrade, and the pressure head speed controlling is at 50 ~ 70mm/s;
(4) suppress feeding: after die cavity is full of, continue the extruded aluminium liquation through pressure head, carry out and force feeding, exerting all one's strength can alloy cooling, crystallization under the high pressure effect, solidify the formation foundry goods; Specific pressure is 85 ~ 100Mpa, and the dwell time is 30 ~ 40s;
(5) aluminum alloy connecting rod with extrusion modling takes out from mould, carries out heat treatment reinforcement after the cleaning of foundry goods.
Beneficial effect of the present invention:
1. the cracking of presetting in the mould is with foil and molten metal effect, and the cooling back is at the cracking interface that the predetermined cracking zone of connecting rod forms, and improves problems such as splitting not open of occurring in the connecting rod cracking process, crack branching or crackle extended offset precalculated position.
2. controlled filling velocity has guaranteed to preset that foil both sides molten metal steadily rises, exhaust is smooth and easy, avoids producing and impacts and turbulent flow, effectively avoids being involved in gas and oxidizing slag;
3. can obtain fine and close connecting rod foundry goods, under the pressure head effect of suppressing, be in the molten metal generation dendrite fragmentation of accurate solid phase, realize the pressure feeding, reduce the crackle tendency, eliminate hot tearing hidden danger.
4. the dimensional accuracy of connecting rod foundry goods and surface quality improve, and mechanical property improves a lot, and production method is simple, and technological parameter can fluctuate greatly, and product percent of pass is high.
Description of drawings
Fig. 1 is the bar linkage structure sketch map
Fig. 2 is an aluminum alloy connecting rod antigravity extrusion casting and forming device structural representation of the present invention
Fig. 3 is the vertical view of the counterdie of apparatus of the present invention
Fig. 4 is shunting wimble structure sketch map
Among the figure: counterdie seat board 1, pull bar 2, down mould bases 3, counterdie 1, top mold frame 5, patrix 1, push rod 7, nut 8,9,18 cope match-plate patterns 9, cope match-plate pattern 10, die shank 11, knockout plate 12, foil 13,
Upper molded plate 14, guide pin bushing 15, patrix 2 16, gripper shoe 17, screw mandrel 19, counterdie 2 20, pilot pin 21, connecting rod cap shape chamber 22, liquid material cylinder 23, pressure head 24, pressure chamber 25, sprue bush 26, branch flow cone 27, fan-shaped running channel 28, connecting rod bodily form chamber 29, gonnecting rod body 30, cracking interface 31, connecting rod cap 32, wedge 33
Snap ring 34, rolling wheel 35
The practical implementation method
Contrast accompanying drawing below,, the specific embodiment of patent of the present invention is done further explain through description to embodiment.
Embodiment:
Fig. 1 is the sketch map of present embodiment connecting rod, and this connecting rod comprises gonnecting rod body 30, connecting rod cap 32, and both guarantee accurately engagement by the staggered structure of cracking interface 32 eyetooths.
Present embodiment adopts the antigravity extrusion casting method to make cracking type aluminum alloy connecting rod.Connecting rod material is the LD10 aluminium alloy, and the foil that is used for the connecting rod cracking is selected magnesium base alloy AZ31 for use, and its thickness is 0.1mm.
In conjunction with Fig. 1, Fig. 2; The antigravity extrusion casint device of the aluminum alloy connecting rod among the present invention comprises patrix 2 16, patrix 1, counterdie 1, counterdie 2 20, top mold frame 5, following mould bases 3, divides flow cone 27, snap ring 34, sprue bush 26, liquid material cylinder 23, pressure head 24, screw mandrel 19, pull bar 2, push rod 7, upper molded plate 14, counterdie backing plate 1, die shank 11; Mold cavity is made up of gonnecting rod body die cavity 29 and connecting rod cap die cavity 22; With connecting rod cap die cavity 22 vertical involutory surface places boss face and the curved cavity that cooperatively interacts is set at gonnecting rod body die cavity 29; The boss face height is slightly less than the cavity degree of depth 0.15 ㎜; Boss face cooperates with curved cavity during matched moulds; The patrix 1 that is nested in the top mold frame 5 is accurately located with patrix 2 16, the counterdie 1 that is nested in down in the mould bases 3 is accurately located with counterdie 2 16, the gap that matched moulds rear boss face and cavity constitute is used to place foil.Counterdie backing plate 1 end near the connecting rod cap die cavity is provided with screw mandrel 19; Can regulate the position of connecting rod cap casting mold in mould bases through screw mandrel 19; Suitably regulate spacing between gonnecting rod body casting mold and the connecting rod cap casting mold; Be convenient in gap 13 to install foil or change foil, utilize the wedge 33 of mould bases 3 both sides down that foil is fixed again.The injection device of mould is vertically set on the vertical-parting basifacial of gonnecting rod body die cavity 29 and connecting rod cap die cavity 22; Be fixed on the counterdie backing plate 1; Its liquid material cylinder 23 is not for there being the top cylindrical tubular structure at the no end; The top is communicated with liquid material chamber 25 with sprue bush 26 presses the chamber, and the bottom cooperates the cylinder pressure head 24 of steel, and squeeze pressure was provided by pressure head 24 when type was filled in cast.Mold top is provided with the mould emptier that is made up of pull bar 2, push rod 7, knockout plate 14;
Subsequent use foil band is placed on the rolling wheel 35 during casting, be to increase the toughness of foil band, and preventing that foil from tearing to replacing and the attaching together of mould of foil makes troubles, earlier at the upper edge stickup high temperature gummed tape of foil band.When installing or change foil; Spacing through screw mechanism adjustment gonnecting rod body die cavity and connecting rod cap die cavity; Behind the foil of packing into, drag high temperature gummed tape from die side, utilize the fixing foil of wedge of ledge structure and the framed both sides of two die cavity mating surfaces at last to adjust its position in the gap.
Working process of mould: mould is by two independently hydraulic cylinder operation work; During the mould matched moulds; Die shank 11 declines drive patrix 1 and move downward and matched moulds with patrix 2 16; Position through pull bar 2 and alignment pin 21, and regulate through leading screw 19 and to preset the foil clamping that is fixed behind the connecting rod cap casting mold positions.During production, earlier alloy liquid is quantitatively poured in the liquid material cylinder 23, hydraulic cylinder upwards promotes pressure head 24 and moves with certain speed under the hydraulic press; Liquid alloy liquid gets into die cavity through fan-shaped running channel; After type to be filled finished, pressure head continues to apply to be suppressed, and made the crystallization and freezing moulding under the high specific pressure condition of alloy liquid.During die sinking, leading screw is adjusted to rational position, die shank 11 drives patrix 1 and moves upward with patrix 2 16, and squeeze casting heads on push rod 7, and knockout plate 12 and pull bar 2 are moved upward together.Pull bar rises behind the segment distance, because the restriction of counterdie backing plate 1, knockout plate 12 and pull bar 2 all no longer move upward with die shank.Like this, when die shank 11 drove patrix continuation rising, push rod was just made squeeze casting from die cavity.
The antigravity Squeeze Casting Parameters on Microstructure of aluminium alloy LD10 connecting rod is following:
The processing step of present embodiment is followed successively by: preheated mold, apply releasing agent, preset foil, matched moulds, low pressure fill type, extrusion modling, die sinking pickup, heat treatment.The concrete operations step is following:
Step 1: preheated mold: with mould and die preheating to 220 ~ 240 degree centigrade;
Step 2:, and in the gap that big end portion reserves, place the foil that is used for the connecting rod cracking, matched moulds then to mold cavity spary releasing agent; The coating that adopts is the aqua aquadag;
Step 3: be poured into liquid material chamber to aluminum melt, promote aluminum melt through pressure head, make aluminum melt fill with die cavity from the antigravity direction with stable flow velocity, the aluminum melt temperature is controlled at 650 ~ 720 degrees centigrade, and the pressure head speed controlling is at 50 ~ 70mm/s; Directly with aluminum melt running channel liquid chamber, or reserve pouring slot at material cylinder outer wall with casting ladle, directly inject aluminium liquid from side, liquid material chamber, pressure head adopts slide block to seal pouring slot when injection.
Step 4: suppress feeding: after die cavity is full of, continue the extruded aluminium liquation through pressure head, carry out and force feeding, make its foundry goods of solidification and crystallization formation under pressure, specific pressure is 85 ~ 100Mpa, and the dwell time is 30 ~ 40s;
Step 5: the aluminum alloy connecting rod behind the extrusion solidification is taken out from mould; The casting cleaning after-baking: solid solubility temperature is
; Temperature retention time is 6 ~ 8h; Quenching is controlled in the 15s transfer time, quenches with
hot water; Ageing Treatment is
; Temperature retention time is 8 ~ 10h, the air cooling of coming out of the stove.
The present invention has significantly improved the crystalline structure and the mechanical property of connecting rod foundry goods owing to adopt rational antigravity technological process of extruding and rational die device, reduces casting flaws such as shrinkage cavity, shrinkage porosite, volume gas.The connecting rod of casting at ambient temperature; Through apply the disconnected load that expands at crank pin end pore; Can realize that gonnecting rod body, connecting rod cap separate along the fragility of the cracking face that presets; And the staggered structure of plane of disruption eyetooth makes gonnecting rod body and connecting rod cap have good engagement property and reorientation property, guarantees that both can accurately attach together.
Claims (3)
1. the antigravity extrusion casint device of an aluminum alloy connecting rod is characterized in that: comprise counterdie one (4), counterdie two (20), patrix two (16), patrix one (6), top mold frame (5), following mould bases (3), divide flow cone (27), snap ring (34), sprue bush (26), liquid material cylinder (23), pressure head (24), leading screw (19), pull bar (2), push rod (7), upper molded plate (14), counterdie backing plate (1), die shank (11); Mold cavity is made up of gonnecting rod body die cavity (29) and connecting rod cap die cavity (22); With the vertical involutory surface of connecting rod cap die cavity (22) place boss face and the curved cavity that cooperatively interacts is set at gonnecting rod body die cavity (29); The boss face height is slightly less than the cavity degree of depth 0.02 ~ 0.25 ㎜; Boss face cooperates with curved cavity during matched moulds; Make the patrix one (4) and patrix two (16) accurate location that are nested in the top mold frame (5), the counterdie one (20) that is nested in down in the mould bases (3) is accurately located with counterdie two (16), the gap that matched moulds rear boss face and cavity constitute is used to place foil; Following mould bases (3) is provided with wedge-shaped slot with top mold frame (5) both sides, and wedge (33) embeds and is installed in the wedge-shaped slot, and is fixed on down on the mould bases (3) by screw, and the wedge outer edge side is equipped with rolling wheel (35); Counterdie backing plate (1) end near connecting rod cap die cavity (22) is provided with leading screw (19); Through regulating screw mandrel (19) the connecting rod cap die cavity (22) of patrix two (16) with counterdie two (20) compositions moved along screw mandrel (19) axis direction, change the spacing (13) between the two die cavity involutory surfaces; At the gonnecting rod body die cavity (29) and the vertical-parting basifacial of connecting rod cap die cavity (22) liquid material cylinder (23) is installed; Said liquid material cylinder (23) is not for there being the top cylindrical tubular structure at the no end; Its top is communicated with liquid material chamber (25) with sprue bush (26) presses chamber (25), and the bottom cooperates the cylinder pressure head (24) of steel; Press top, chamber (25) that branch flow cone (27) is installed; Said minute flow cone (27) be cylinder table stepped column body, involute by two semicylinders, wherein half sheet divides the bottom of flow cone in gonnecting rod body die cavity (29); Half sheet divides the bottom of flow cone (27) in connecting rod cap die cavity (22) in addition; And the position is corresponding each other, divides flow cone (27) both sides that two independently fan-shaped running channels (28) are arranged, and is communicated with gonnecting rod body die cavity (29) and connecting rod cap die cavity (22) respectively; During installation snap ring (34) is embedded the collar that divides flow cone (27) bottom, be fixedly clamped with counterdie backing plate (1) through counterdie one (4), counterdie two (20); Upper molded plate is provided with mould emptier on (14), and pull bar (2) is fixed on the knockout plate (14) with push rod (7) upper end, and pull bar (2) lower end is provided with the shaft shoulder, and restriction knockout plate (14) and push rod (2) moves upward during the demoulding.
2. adopt the manufacturing approach of the antigravity extrusion casint device of the said anti-alloy connecting rod of claim 1; It is characterized in that steps in sequence is: preheated mold, apply releasing agent, preset foil, matched moulds, low pressure fill type, extrusion modling, die sinking pickup, heat treatment; Concrete steps are:
(A) preheated mold: with mould and die preheating to 150 ~ 250 degree centigrade;
(B) wall of die cavity spary releasing agent, and in the fit clearance (13) of gonnecting rod body die cavity (29) and connecting rod cap die cavity (22), place the foil that is used for the connecting rod cracking, matched moulds;
(C) low pressure is filled type: quantitatively be poured into aluminum alloy melt in the liquid material cylinder, steadily push through pressure head low speed, aluminum melt is filled with die cavity through the antigravity direction with stable flow velocity, and the aluminium alloy pouring temperature is 650 ~ 720 degrees centigrade, and the pressure head speed controlling is at 50 ~ 70mm/s;
(D) suppress feeding: after die cavity is full of, continue the extruded aluminium liquation through pressure head, carry out and force feeding, exerting all one's strength can alloy cooling, crystallization under the high pressure effect, solidify the formation foundry goods; Specific pressure is 85 ~ 100Mpa, and the dwell time is 30 ~ 40s;
(F) aluminum alloy connecting rod with extrusion modling takes out from mould, carries out heat treatment reinforcement after the cleaning of foundry goods.
3. the manufacturing approach of the antigravity extrusion casint of alloy connecting rod according to claim 2; It is characterized in that: subsequent use foil band is placed on the rolling wheel (35); When foil is installed; At the upper and lower lateral edges pasted with high temperature-resistant of foil band adhesive tape, said high temperature gummed tape heat resistance is at
earlier.
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| CN103658597A (en) * | 2012-09-07 | 2014-03-26 | 秦皇岛戴卡兴龙轮毂有限公司 | Aluminium alloy wheel gravity pressing casting method and device |
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| CN108788090A (en) * | 2018-07-04 | 2018-11-13 | 重庆环鹰机械有限公司 | A kind of cavity flow passage structure of aluminum alloy connecting rod liquid forging mold |
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