CN102615268B - 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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- CN102615268B CN102615268B CN201210111189.2A CN201210111189A CN102615268B CN 102615268 B CN102615268 B CN 102615268B CN 201210111189 A CN201210111189 A CN 201210111189A CN 102615268 B CN102615268 B CN 102615268B
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Abstract
本发明涉及一种利用反重力挤压铸造工艺制造铝合金连杆的方法及模具，具体说是一种裂解型铝连杆的制造方法与模具，其技术方案是预先在模具内置入适合的箔材，铝熔液以挤压浇注式充型，通过分流锥对的分流与控制，铝液自下而上进入型腔，箔材两侧液面同步上升，使连杆铸件内形成裂解界面。所述模具上设置丝杠机构，调节连杆体型腔与连杆盖型腔对合面之间的间隙，便于放置与更换箔材。用本发明的装置和方法保证连杆铸造时形成的裂解界面在其大头预断区之内，避免连杆在后续裂解加工过程中出现裂纹分叉或裂解面偏移等缺陷，使铸件无卷气，无冷隔、无欠浇、组织紧密、可以进行热处理，其力学性能和机械性能显著提高。
The invention relates to a method and a mold for manufacturing an aluminum alloy connecting rod using an anti-gravity squeeze casting process, in particular to a manufacturing method and a mold for a cracked aluminum connecting rod. The aluminum melt is filled by extrusion pouring. Through the diversion and control of the diverter cone pair, the aluminum liquid enters the cavity from bottom to top, and the liquid level on both sides of the foil rises synchronously, so that a cracking interface is formed in the connecting rod casting. The mold is provided with a screw mechanism to adjust the gap between the cavity of the connecting rod body and the mating surface of the cavity of the connecting rod cover, which is convenient for placing and replacing the foil material. The device and method of the present invention ensure that the cracking interface formed during the casting of the connecting rod is within the pre-fracture area of the big end, avoiding defects such as crack bifurcation or cracking surface deviation in the subsequent cracking process of the connecting rod, so that the casting has no air entrainment , no cold insulation, no under-casting, compact structure, heat treatment possible, and its mechanical properties and mechanical properties are significantly improved.
Description
Technical field
The invention belongs to and adopt Extrution casting technique to prepare 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 by gonnecting rod body and connecting rod cap, in its course of work, mainly bear the high frequency alternate loads such as stretching that burning explosive force and reciprocal inertia force produce, compression, bending, condition of work is severe, motion state complexity, fatigue, wearing and tearing, vibrations etc. affect the service life of connecting rod.Therefore, require connecting rod should there is higher intensity and anti-fatigue performance, there is again enough rigidity and toughness.
Many scientific workers have proposed multiple alloy liquid forming technique in recent years, as high pressure casting, low pressure casting method (containing gravitational casting).High pressure casting is the moulding that by die casting machine high-voltage high-speed, liquid alloy injection is entered to cooling and shaping in mould die cavity and completes goods, its filling velocity is fast, but in injection process, often occur that exhaust is bad, aluminium alloy volume gas, make foundry goods organize gassiness, and there is cold shut, owe the defects such as casting, cause the mechanical performance of goods to reduce, can not heat-treat.Low pressure casting method is to use low pressure low speed that hot liquid alloy injection is entered in the die cavity of mould by die casting machine, cooling and shaping completes the moulding of goods, 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 deficiency of foundry goods, make tissue looseness, coarse grains, mechanical performance is lower.
At present, the processing of domestic aluminum alloy connecting rod depends on traditional machining mode, is first gonnecting rod body, connecting rod cap two parts by the sawing of monolithic linkage blank, then adopts grinding method to process both involutory surfaces.This manufacturing procedure is various, inefficiency, and be subject to location precision, connecting rod bearing capacity and the assembly precision of manufacture are subject to considerable restraint.Abroad, adopted PM technique, semisolid forming technique to manufacture aluminum alloy connecting rod.U.S. Patent number: US20020148325A1, has proposed employing semisolid forming technique and has manufactured cracking type aluminum alloy connecting rod.After this patent proposes that the aluminium alloy of special component is made into semisolid raw material, Piston Rods Die moulding is injected in extruding, the follow-up obdurability that regulates aluminum alloy connecting rod through quenching heat treatment, artificial aging, make it at ambient temperature can brittle fracture, meet the requirement of con-rod fracture splitting 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 affects connecting rod of the crystal grain of its cooling rear formation, the affect complexity of follow-up heat treatment on connecting rod performance, adds con-rod fracture splitting to be prone to major part man-hour to tear, split not open, fall the problem such as slag, plane of disruption distortion.
By Tang Quanbo, " extrusion casint of ADC12 aluminum alloy connecting rod " that Jiang Jufu etc. deliver, 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 of manufacturing by the method is very fine and smooth, without loose, surface quality and mechanical property are higher, but there is following shortcoming: the quantity and the temperature control that 1) pour into aluminum melt in die cavity want tight, consider that aluminum melt is through extruding, solidify rear volume contraction and ask complexity, otherwise the forming dimension of connecting rod blank do not reach technical requirement or because of aluminum melt few, and make metal structure loose, thereby product percent of pass is low, operating technology requires high, 2) due to after cast, start before pressurization, liquid metal liquid easily forms free crust at wedge angle or narrow chamber place, after pressurization, freely crusts and is racked, molten metal is wrapped in wherein, easily forms bark pocket.
Antigravity extrusion casint is a kind of casting, forges the few smear metal or the chipless technique that are integrated, and liquid alloy, through the squeezing action of pressure head, is filled die cavity with low flow velocity, large flow, until molten metal during in semi-solid range, continues extruded alloy and carries out high pressure and force feeding.The method has overcome high pressure casting and has easily been involved in the defect of gas and oxidizing slag, has effectively improved the tissue looseness that low pressure casting method freezing pressure causes not, the defects such as coarse grains.In addition, under hot pressing condition, the foil that cracking is used reacts formed fused interface densification with molten metal, all volume defects of interface internal are flattened, the oxide that near interface generates binds by diffusion and matrix material, thereby, in connecting rod blank, form desirable cracking interface, to improve con-rod fracture splitting efficiency, guarantee fracture quality.
Summary of the invention
The object of this invention is to provide a kind of manufacture method and mould of cracking type aluminum alloy connecting rod blank, solve and adopt the operation existing in traditional machining aluminum alloy connecting rod technique various, stock utilization is low, machine tool investment is large, cutter and the problem such as energy consumption is many.
The present invention places in advance cracking material in mold cavity, enter the molten metal of die cavity by the reasonable distribution of fan-shaped running channel and spreader, make the molten metal of foil both sides synchronously increase, reduce the impact of molten metal to foil in cavity filling process, the cracking interface forming after cooling in the predetermined cut section of connecting rod.When subsequent implementation cracking technology, connecting rod, along prefabricated cracking interfacial fracture subdivision, can avoid occurring the defect such as crack branching or the skew of cracking face
Utilize antigravity Extrution casting technique to manufacture a mould for aluminum alloy connecting rod, comprise patrix one, counterdie one, patrix two, counterdie two, top mold frame, lower mold holder, spreader, 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, the boss face and the curved cavity that cooperatively interact are set at gonnecting rod body die cavity (29), boss face height is slightly less than the cavity degree of depth 0.02 ~ 0.25 ㎜, when matched moulds, boss face coordinates with curved cavity, the patrix one that makes to be nested in top mold frame is accurately located with patrix two, the counterdie one that makes to be nested in lower mold holder is accurately located with counterdie two, and the gap that matched moulds rear boss face and cavity form is used for placing foil; Lower mold holder and top mold frame both sides arrange wedge-shaped slot, and wedge is fixed on die shoe by screw, and wedge outer edge side is equipped with rolling wheel; At the counterdie backing plate end near connecting rod cap die cavity, screw mandrel is set, moves along screw mandrel axis direction by the connecting rod cap casting mold that regulates screw mandrel patrix two and counterdie two can be formed, the spacing between the involutory surface of change two die cavities; Vertical-parting basifacial at gonnecting rod body die cavity and connecting rod cap die cavity is installed liquid material cylinder, and described liquid material cylinder is the cylindrical tubular structure bottomless without top, and its top is communicated with pressure chamber with sprue bush by liquid material chamber, and bottom coordinates the column indenter indentation of steel; Pressure chamber top is provided with spreader, described spreader is cylinder table stepped column body, involuted by two semicylinders, wherein half sheet spreader is in the bottom of gonnecting rod body die cavity, another half sheet spreader is in the bottom of connecting rod cap die cavity, and position is mutually corresponding, and there are two independently fan-shaped running channels spreader both sides, are communicated with respectively gonnecting rod body die cavity and connecting rod cap die cavity; When installation, snap ring is embedded to the collar of spreader bottom, fasten with counterdie padding plate clip through counterdie one, counterdie two; Mould emptier is set on upper molded plate, and pull bar and push rod upper end are fixed on knockout plate, and pull bar lower end is provided with the shaft shoulder, limits moving upward of knockout plate and push rod when the demoulding.
Described screw mandrel can move connecting rod cap casting mold along screw mandrel axis direction, the spacing being used between regulating connecting rod body casting mold and connecting rod cap casting mold is convenient in this gap, install or change foil before casting; Lower mold holder and top mold frame both sides arrange wedge-shaped slot, and wedge embeds and is arranged in wedge-shaped slot, be fixed on die shoe, and utilize the fixing foil of wedging power between the two by screw; Wedge outer edge side is equipped with rolling wheel, when casting, foil for subsequent use is placed on rolling wheel in advance.When foil is installed, first paste high temperature gummed tape in foil band upper edge, to increase foil band strength and toughness, when production, realize the conveying of continuously, not cutting off of foil.
The operation principle of mould and process: mould is with horizontal parting, and die joint is arranged on the center line position on the lower side of connecting rod part, 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, when mould matched moulds, die shank declines and drives patrix one, patrix two to move downward and matched moulds, positions by pull bar and alignment pin, and by the clamping that is fixed of preset foil behind screw mandrel regulating connecting rod lid casting mold position.When production, first aluminium alloy is quantitatively poured in liquid material cylinder, under hydraulic press, hydraulic cylinder upwards promotes pressure head and moves with certain speed, liquid alloy liquid enters die cavity through fan-shaped running channel, after type to be filled, pressure head continues to apply to be suppressed, and makes aluminium alloy crystallization and freezing moulding under high specific pressure condition.When die sinking, first leading screw is adjusted to rational position, die shank drives patrix one, patrix two to move upward, and foundry goods heads on push rod, and knockout plate is moved upward together with pull bar.Pull bar rises after a segment distance, and due to the restriction of counterdie backing plate, knockout plate and pull bar all no longer move upward with die shank.Like this, in the time that die shank drives patrix to continue to rise, push rod is 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, coating releasing agent, preset foil, matched moulds, low pressure are filled type, extrusion modling, die sinking pickup, heat treatment;
(1) preheated mold: by mould and die preheating to 150 ~ 250 degree Celsius;
(2) wall of die cavity spary releasing agent, and in the interior placement in gap 13 for the foil of con-rod fracture splitting, then matched moulds;
(3) low pressure is filled type: aluminum alloy melt quantitative pouring, in liquid material cylinder, is steadily pushed through pressure head low speed, and aluminum melt fills die cavity through antigravity direction with stable flow velocity, and aluminium alloy pouring temperature is 650 ~ 720 degrees Celsius, and pressure head speed is controlled at 50 ~ 70mm/s;
(4) suppress feeding: after die cavity is full of, continue extruded aluminium liquation through pressure head, carry out and force feeding, can alloy cooling under high pressure effect, the crystallization of exerting all one's strength, solidify formation foundry goods; Specific pressure is 85 ~ 100Mpa, and the dwell time is 30 ~ 40s;
(5) aluminum alloy connecting rod of extrusion modling is taken out from mould, after the cleaning of foundry goods, carry out heat treatment reinforcement.
Beneficial effect of the present invention:
1. preset foil and molten metal effect for cracking in mould, the cracking interface forming in the predetermined cracking zone of connecting rod after cooling, improves splitting not open of occurring in con-rod fracture splitting process, crack branching or Crack Extension and is offset the problems such as precalculated position.
2. controlled filling velocity, has guaranteed that preset 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, suppress the molten metal generation dendrite fragmentation in accurate solid phase under effect at pressure head, realize pressure feeding, reduce 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.
Accompanying drawing explanation
Fig. 1 is bar linkage structure schematic diagram
Fig. 2 is aluminum alloy connecting rod antigravity extrusion casting and forming device structural representation of the present invention
Fig. 3 is the top view of the counterdie of apparatus of the present invention
Fig. 4 is spreader structural representation
In figure: counterdie seat board 1, pull bar 2, lower mold holder 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, spreader 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
specific implementation method
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of patent of the present invention is described in further detail.
embodiment:
Fig. 1 is the schematic diagram of the 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.
The present embodiment adopts antigravity extrusion casting method to manufacture cracking type aluminum alloy connecting rod.Connecting rod material is LD10 aluminium alloy, selects magnesium base alloy AZ31 for the foil of con-rod fracture splitting, and its thickness is 0.1mm.
In conjunction with Fig. 1, Fig. 2, the antigravity extrusion casint device of the aluminum alloy connecting rod in the present invention, comprises patrix 2 16, patrix 1, counterdie 1, counterdie 2 20, top mold frame 5, lower mold holder 3, spreader 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, at gonnecting rod body die cavity 29 involutory surface vertical with connecting rod cap die cavity 22, place arranges the boss face and the curved cavity that cooperatively interact, boss face height is slightly less than the cavity degree of depth 0.15 ㎜, when matched moulds, boss face coordinates with curved cavity, the patrix 1 that makes to be nested in top mold frame 5 is accurately located with patrix 2 16, the counterdie 1 that makes to be nested in lower mold holder 3 is accurately located with counterdie 2 16, and the gap that matched moulds rear boss face and cavity form is used for placing foil.Be provided with screw mandrel 19 at counterdie backing plate 1 end near connecting rod cap die cavity, can pass through screw mandrel 19 positions of regulating connecting rod lid casting mold in mould bases, suitably spacing between regulating connecting rod body casting mold and connecting rod cap casting mold, be convenient to interior installation foil or replacing foil in gap 13, the wedge 33 of recycling lower mold holder 3 both sides is fixed foil.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 counterdie backing plate 1, its liquid material cylinder 23 is the cylindrical tubular structure bottomless without top, top is communicated with pressure chamber with sprue bush 26 by liquid material chamber 25, bottom coordinates the column indenter indentation 24 of steel, and when type is filled in cast, squeeze pressure is provided by pressure head 24.Mould top is provided with the mould emptier being made up of pull bar 2, push rod 7, knockout plate 14;
When casting, foil band for subsequent use is placed on rolling wheel 35, is the toughness that increases foil band, and preventing that foil from tearing to replacing and the attaching together of mould of foil makes troubles, first at the upper edge stickup high temperature gummed tape of foil band.In the time installing or change foil, adjust the spacing of gonnecting rod body die cavity and connecting rod cap die cavity by screw mechanism, from die side to packing into foil, drag high temperature gummed tape to adjust its position in gap, finally utilize two ledge structures of die cavity mating surface and the wedge of framed both sides to fix foil.
The course of work of mould: mould is by two independently hydraulic cylinder operation work, when mould matched moulds, die shank 11 declines and drives patrix 1 and patrix 2 16 to move downward and matched moulds, position by pull bar 2 and alignment pin 21, and by the clamping that is fixed of preset foil behind leading screw 19 regulating connecting rod lid casting mold positions.When production, first aluminium alloy is quantitatively poured in liquid material cylinder 23, under hydraulic press, hydraulic cylinder upwards promotes pressure head 24 and moves with certain speed, liquid alloy liquid enters die cavity through fan-shaped running channel, after type to be filled, pressure head continues to apply to be suppressed, and makes aluminium alloy crystallization and freezing moulding under high specific pressure condition.When die sinking, leading screw is adjusted to rational position, die shank 11 drives patrix 1 and patrix 2 16 to move upward, and squeeze casting heads on push rod 7, and knockout plate 12 is moved upward together with pull bar 2.Pull bar rises after a segment distance, and due to the restriction of counterdie backing plate 1, knockout plate 12 and pull bar 2 all no longer move upward with die shank.Like this, in the time that die shank 11 drives patrix to continue to rise, push rod is just made squeeze casting from die cavity.
The antigravity Squeeze Casting Parameters on Microstructure of aluminium alloy LD10 connecting rod is as follows:
The processing step of the present embodiment is followed successively by: preheated mold, coating releasing agent, preset foil, matched moulds, low pressure are filled type, extrusion modling, die sinking pickup, heat treatment.Concrete operation step is as follows:
Step 1: preheated mold: by mould and die preheating to 220 ~ 240 degree Celsius;
Step 2: to mold cavity spary releasing agent, and place the foil for con-rod fracture splitting, then matched moulds in the reserved gap of big end portion; ; The coating adopting is aqua aquadag;
Step 3: aluminum melt is poured into liquid material chamber, promotes aluminum melt through pressure head, make aluminum melt fill die cavity from antigravity direction with stable flow velocity, aluminum melt temperature is controlled at 650 ~ 720 degrees Celsius, and pressure head speed is controlled at 50 ~ 70mm/s; Directly by aluminum melt running channel liquid chamber, or at the reserved pouring slot of material cylinder outer wall, directly inject aluminium liquid from side, liquid material chamber with casting ladle, pressure head adopts slide block sealing pouring slot in the time of injection.
Step 4: suppress feeding: after die cavity is full of, continue 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 after extrusion solidification is taken out from mould to casting cleaning after-baking: solid solubility temperature is
, temperature retention time is 6 ~ 8h, quenching shift time is controlled in 15s, uses
hot water quenches; Ageing Treatment is
, temperature retention time is 8 ~ 10h, the air cooling of coming out of the stove.
The present invention, owing to adopting rational antigravity technological process of extruding and rational die device, has significantly improved crystalline structure and the mechanical property of connecting rod foundry goods, reduces the casting flaw such as shrinkage cavity and porosity, volume gas.The connecting rod of casting at ambient temperature, by apply swollen disconnected load at crank pin end pore, can realize gonnecting rod body, connecting rod cap separates along the fragility of preset cracking face, and the staggered structure of plane of disruption eyetooth makes gonnecting rod body and connecting rod cap have good engagement property and reorientation, guarantee that both can accurately attach together.
Claims (3)
1. an antigravity extrusion casint device for 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), lower mold holder (3), spreader (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 connecting rod bodily form chamber (29) and connecting rod cap shape chamber (22), with vertical involutory surface place, connecting rod cap shape chamber (22), the boss face and the curved cavity that cooperatively interact are set in connecting rod bodily form chamber (29), boss face height is slightly less than the cavity degree of depth 0.02 ~ 0.25 ㎜, when matched moulds, boss face coordinates with curved cavity, the patrix one (6) that makes to be nested in top mold frame (5) is accurately located with patrix two (16), the counterdie one (4) that makes to be nested in lower mold holder (3) is accurately located with counterdie two (20), the gap that matched moulds rear boss face and cavity form is used for placing foil, lower mold holder (3) arranges wedge-shaped slot with top mold frame (5) both sides, and wedge (33) embeds and is arranged in wedge-shaped slot, and it is upper to be fixed on lower mold holder (3) by screw, and wedge outer edge side is equipped with rolling wheel (35), at counterdie backing plate (1) end near connecting rod cap shape chamber (22), leading screw (19) is set, by regulating screw mandrel (19) that patrix two (16) and the connecting rod cap shape chamber (22) of counterdie two (20) compositions are moved along screw mandrel (19) axis direction, thereby change the spacing in gap between two die cavity involutory surfaces, with the vertical-parting basifacial in connecting rod cap shape chamber (22), liquid material cylinder (23) is installed in connecting rod bodily form chamber (29), described liquid material cylinder (23) is the cylindrical tubular structure bottomless without top, it is sprue bush (26) connection liquid material cylinder (23) and pressure chamber (25) for top, and bottom coordinates the column indenter indentation (24) of steel, pressure chamber (25) top is provided with spreader (27), described spreader (27) is cylinder table stepped column body, involuted by two semicylinders, wherein half sheet spreader is in the bottom in connecting rod bodily form chamber (29), another half sheet spreader is in the bottom in connecting rod cap shape chamber (22), and position is mutually corresponding, there are two independently fan-shaped running channels (28) spreader (27) both sides, be communicated with respectively connecting rod bodily form chamber (29) and connecting rod cap shape chamber (22), when installation, snap ring (34) is embedded to the collar of spreader (27) bottom, through counterdie one (4), counterdie two (20) is fixedly clamped with counterdie backing plate (1), upper molded plate arranges mould emptier on (14), and pull bar (2) is fixed on knockout plate (12) above with push rod (7) upper end, and pull bar (2) lower end is provided with the shaft shoulder, limits moving upward of knockout plate (12) and push rod (7) when the demoulding.
2. adopt the antigravity extrusion casint device of aluminum alloy connecting rod claimed in claim 1 to manufacture the method for aluminum alloy connecting rod, it is characterized in that, step is followed successively by: preheated mold, coating releasing agent, preset foil, matched moulds, low pressure are filled type, extrusion modling, die sinking pickup, heat treatment; Concrete steps are:
(A) preheated mold: by mould and die preheating to 150 ~ 250 degree Celsius;
(B) wall of die cavity spary releasing agent, and in the fit clearance in connecting rod bodily form chamber (29) and connecting rod cap shape chamber (22), place the foil (13) for con-rod fracture splitting, matched moulds;
(C) low pressure is filled type: aluminum alloy melt quantitative pouring, in liquid material cylinder, is steadily pushed through pressure head low speed, and aluminum melt fills die cavity through antigravity direction with stable flow velocity, and aluminium alloy pouring temperature is 650 ~ 720 degrees Celsius, and pressure head speed is controlled at 50 ~ 70mm/s;
(D) suppress feeding: after die cavity is full of, pressure head continues extruded aluminium liquation, carries out and forces feeding, make that aluminium alloy is cooling under high pressure effect, crystallization, solidify formation foundry goods; Pressure is 85 ~ 100Mpa, and the dwell time is 30 ~ 40s;
(F) aluminum alloy connecting rod of extrusion modling is taken out from mould, after casting cleaning, carry out heat treatment reinforcement.
3. the method for manufacture aluminum alloy connecting rod according to claim 2, is characterized in that: it is upper that foil band for subsequent use is placed on rolling wheel (35), and when foil is installed, first at the upper and lower lateral edges pasted with high temperature-resistant of foil band adhesive tape, described high temperature resistant adhesive tape heat resistance exists
.
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| CN102652997A (en) * | 2012-04-26 | 2012-09-05 | 太仓市弧螺机电有限公司 | Pull rod discharging mechanism |
| 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 |
| CN103341599A (en) * | 2013-06-28 | 2013-10-09 | 常州午阳柴油机水箱制造有限公司 | Horizontal casting machine and method for using same |
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| CN104801692B (en) * | 2015-03-12 | 2016-10-19 | 宁波市北仑华盛模具厂 | A kind of die casting |
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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 |
| CN112658226B (en) * | 2020-12-11 | 2022-02-15 | 哈尔滨工业大学 | A kind of unequal thickness deep cavity shell type aluminum alloy component extrusion casting device and using method thereof |
| CN116037895A (en) * | 2021-10-28 | 2023-05-02 | 宝兴（宁波）机械科技有限公司 | Metal compression molding equipment and molding process thereof |
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