CN204912714U

CN204912714U - Large -scale aluminum alloy squeeze casting's piston

Info

Publication number: CN204912714U
Application number: CN201520261982.XU
Authority: CN
Inventors: 傅金观; 吴新陆
Original assignee: Jiaxing Juxin Mould Technology Co Ltd; Zhejiang Ya Lu Casts Co Ltd
Current assignee: JIAXING JUXIN MOULD TECHNOLOGY CO., LTD.; Zhejiang asiaway casting Limited by Share Ltd
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2015-12-30
Anticipated expiration: 2025-04-21

Abstract

The utility model discloses a large -scale aluminum alloy squeeze casting's piston and foundry technology, characterized by piston squeeze casting mould are loosed core the ware by movable mould principal mode core, fixed mould benevolence, piston pin core, push rod, combustion chamber core, hydraulic pressure and are constituteed, the mould be the appearance of squeeze casting mould, piston foundry goods, piston pin core, combustion chamber core on by fixed mould benevolence each part compose shape, shape is then composed by the principal mode core in the movable mould to the inner chamber of piston, squeeze casting technology as follows: the two fixed parts of moving of mould are installed respectively on the last lower bolster of squeeze casting machine to keep certain distance, the manipulator is ladled out and is got quantitative molten aluminum alloy, and the snakelike funnel of pouring -in flows into the cavity of fixed mould benevolence with mild state, and the principal mode core at movable mould position at the uniform velocity pushes down immediately, gets into the aluminum alloy liquid level and let it rise gradually to be full of the closed die cavity that moves the cover half and constitutes up to aluminium liquid, is close to 100MPa in here specific pressure that the in -process used to pressurize a period, the liquid aluminium alloy then solidifies under pressure, and the volume that sealed die cavity along with the shrink of aluminum alloy liquid this moment slightly reduces, the alloy meanwhile hugged closely with fixed mould mould benevolence and movable mould principal mode core condensation very fast forms a shell of bodiness gradually, its structural strength is higher hindered very fast movable mould principal mode core continue push down, the shell of this moment has possessed the basic profile of appearance in the piston foundry goods promptly.

Description

The piston of large aluminum alloy extrusion casint

Technical field

Patent of the present invention relates to a kind of piston of large aluminum alloy extrusion casint, particularly aluminium alloy extrusion casting Design of Dies and technique, belongs to aluminum alloy casting technique technical field.

Background technology:

The diesel engine of power more than 1,000 horsepowers has 12 cylinders usually, and traditional piston all cylinder iron makes, but due to ironcasting self very heavy, need the idle work energy that costs a lot of money during running, put off until some time later its dynamic balancing be also difficult to reach perfect condition.In recent years professional factory is used aluminium alloy one after another instead and is carried out alternative cast iron, but is limited by the inherent structure of piston; Foundry goods each several part wall thickness great disparity, can see from the vertical section of piston, thinnest part is skirt section, and place's foundry goods is thick is only 20mm for this, and thickness is the part between combustion chamber and piston pin hole, more than 80mm; So large Wall-Thickness Difference must cause foundry goods in cooling procedure, heavy wall place solidifies the slowest in centre, the rising head seemed into thin-walled position, the liquid metal at this place is sucked away, cause various latent defect and the flat even draw of appearance contracting, loosening, having pore or even shrinkage cavity appears in foundry goods, and even latent defect is often in irregular distribution, therefore each piston before use all will through counterweight to obtain balance.

The piston of the utility model large aluminum alloy extrusion casint, adopt the method for Novel extrusion casting, make up the deficiency of traditional handicraft, reach the effect of Improving The Quality of Products, thus realize reducing costs, improving casting qualified rate, enhancing enterprise competitiveness in the market.

Summary of the invention

The piston of large aluminum alloy extrusion casint, is characterized in that piston press casting mould is made up of dynamic model main core, fixing die, piston pin core, push rod, combustion chamber core, hydraulic core_pulling device; Described mould is the profile of extrusion casint mould, Piston Casting; Described piston pin core, combustion chamber core are by fixing each part figuration on die; The inner chamber of piston is then by the main core figuration in dynamic model; Operation principle: piston pin core is driven by hydraulic core_pulling device, being in going-back position at Operational preparation stage hydraulic core_pulling device only has pommel to be exposed in the cavity of fixing die by piston pin core; And the cast-in core forming combustion chamber has the effect that auxiliary push-rod releases Piston Casting from fixing die concurrently; Extrution casting technique is as follows: dynamic fixed two parts of mould are installed on the bolster of extrusion casting machine respectively, and maintain a certain distance; Manipulator dips quantitative molten aluminium alloy, pour into snakelike funnel flows into fixed die benevolence cavity with mild state, the main core at dynamic model position at the uniform velocity presses down immediately, enter aluminium alloy liquid level and allow it rise gradually until aluminium liquid is full of the near closed hollow ring that active and inactive mold is formed, specific pressure used in the process is close to 100MPa, and pressurize a period of time, liquid aluminium alloy then solidifies under stress, the volume now with the pinch confinement die cavity of aluminum alloy melt slightly reduces; The very fast condensation of alloy be meanwhile close to fixed die die and dynamic model main core forms the shell of a progressive additive, its structural strength is higher hinder very soon dynamic model main core continue press down, namely shell has now possessed the elementary contour of profile in Piston Casting.

Superior part of the present utility model is used to be: to start piston pin hole core when the alloy of Piston Casting thick wall part is also in liquid state or semi liquid state forward, aluminium alloy is forced to flow to fill up the foundry goods thin-walled position of shrinking in advance, until foundry goods all solidifies, even if the heavy wall place of final set also obtains the feeding of aluminium alloy before the piston pin direction of motion all the time, any position of doing its macroscopical vertical section of obtained foundry goods so all can reach higher technical requirement; Follow-up exerting pressure can make the further broken refinement of the crystallization of alloy, make Piston Casting no matter as cast condition be also through mechanical performance and a few indifference distance of forging of T6 process, but there is no the anisotropic deficiency of forging.

Accompanying drawing explanation

Fig. 1: the Piston mould structure of large aluminum alloy extrusion casint.

1, dynamic model main core, 2, fixing die, 3, piston pin core, 4, push rod, 5, combustion chamber core, 6, hydraulic core_pulling device

Detailed description of the invention

As shown in Figure 1, the piston of large aluminum alloy extrusion casint is implemented like this: piston press casting mould is made up of dynamic model main core 1, fixing die 2, piston pin core 3, push rod 4, combustion chamber core 5, hydraulic core_pulling device 6; Described mould is the profile of extrusion casint mould, Piston Casting; Described piston pin core 3, combustion chamber core 5 are by part figuration each on fixing die 2; The inner chamber of piston is then by dynamic model main core 1 figuration; Extrution casting technique is as follows: dynamic fixed two parts of mould are installed on the bolster of extrusion casting machine respectively, and maintain a certain distance; Manipulator dips quantitative molten aluminium alloy, pour into snakelike funnel flows into fixed die benevolence 2 cavity with mild state, dynamic model main core 1 at the uniform velocity presses down immediately, enter aluminium alloy liquid level and allow it rise gradually until aluminium liquid is full of the near closed hollow ring that active and inactive mold is formed, specific pressure used in the process is close to 100MPa, and pressurize a period of time, liquid aluminium alloy then solidifies under stress, the volume now with the pinch confinement die cavity of aluminum alloy melt slightly reduces; The very fast condensation of alloy be meanwhile close to fixing die 2 and dynamic model main core 1 forms the shell of a progressive additive, its structural strength is higher hinder very soon dynamic model main core 1 continue press down, namely shell has now possessed the elementary contour of profile in Piston Casting.

Claims

1. the piston of large aluminum alloy extrusion casint, is characterized in that piston press casting mould is made up of dynamic model main core (1), fixing die (2), piston pin core (3), push rod (4), combustion chamber core (5), hydraulic core_pulling device (6); Described mould is extrusion casint mould, draws together the profile of plug foundry goods; Described piston pin core (3), combustion chamber core (5) are by the upper each part figuration of fixing die (2); The inner chamber of piston is then by dynamic model main core (1) figuration; Piston is made through extrusion casint.