CN2157842Y

CN2157842Y - Aluminium piston gravity pouring metal mould

Info

Publication number: CN2157842Y
Application number: CN 93213790
Authority: CN
Inventors: 史艳华; 史艳玲
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-21
Filing date: 1993-05-21
Publication date: 1994-03-02
Anticipated expiration: 2003-05-21

Abstract

The utility model relates to a high-quality low-consumption aluminum piston gravity pouring metal mould, composed of an outer mould, a bottom mould, a core mould and a base. The utility model is characterized in that a runner between a pouring cup and a feeding riser has a fan-shaped gap type structure; the horizontal line of the runner is higher than the upper end face of a rough forming. The metal mould with wide range of application is applicable not only for common rough forming of aluminum pistons with different structures, but also for rough casting of pistons with abnormal structures. The casting element made by the metal mould has the advantages of good quality, high stability, sharp and smooth profile and fine inside crystal structure. Waste casting product rate is only 3 percent. The utility model has the advantages of simple structure, easy production, easy maintenance, convenient operation, long service life, etc.

Description

Aluminium piston gravity pouring metal mould

The utility model relates to improvement to all-aluminium piston blank die cast mould.

At present, used aluminium piston on medium and small power diesel engine, gasoline engine or other engine all adopts the die cast blank, forms through machining then.The aluminium piston structure complexity, cavity shape is unusual, and specification requirement is higher, and foundry goods internal soundness and mechanical performance have all been proposed strict demand.For reaching above-mentioned requirements, manufacturer generally adopts the gravity-assist pouring casting technique to obtain blank both at home and abroad, wherein adopts the metal pattern of the form of loosing core to account for the overwhelming majority, this metal pattern manufacturing is simple, easy to operate, the production efficiency height, but unfavorable to casting forming, casting wasted product rate height.The key of casting forming is a consecutive solidification, and it is to carry out to feeding head from foundry goods that molten metal solidifies order; Casting solidification is to carry out to inner core from profile in proper order, upwards carries out from the bottom.If consecutive solidification is unreasonable, the cast casting defective is emerged in an endless stream.Someone designs a kind of metal pattern structure of employing adopting heat pipes for heat transfer Quench, make foundry goods strictly crystallization principle in order carry out crystallization, help reducing foundry goods shrinkage porosite percent defective.But, this metal pattern complex structure, difficulty of processing is big, the manufacturing cost height; For reducing the slag inclusion percent defective, the blank cast must increase filter net sheet, and production cost increases, and increases by a procedure also for operation; Many colloid flexible pipes in particular for adopting heat pipes for heat transfer are connected with metal pattern, hinder operation, and long-term production is difficult to keep, on-the-spot process management complexity, and the mould maintenance workload increases, and in a single day heat pipe breaks, and then can cause dangerous.

The purpose of this utility model is the deficiency that exists at above-mentioned metal pattern, provides a kind of simple in structure, and can improve the foundry goods internal soundness to greatest extent, reduces the high quality and low cost aluminium piston gravity-assist pouring metal pattern of foundary loss rate.

The utility model high quality and low cost aluminium piston gravity-assist pouring metal pattern is by external mold, bed die, core, base is formed, its running and feeding system comprises waters cup, cross gate and feeding head, it is characterized in that: the cross gate that waters between cup and the feeding head is fan-shaped clearance type structure, the horizontal horizontal line that detours is higher than the blank forming upper surface, and cross gate sectional area does not everywhere wait, and waters the cup inlet certainly and arrives the cross gate cross-sectional area of feeding head by diminishing greatly gradually; To a left side, the wall thickness of external mold is by thin progressive additive from right (ingate place) for the die cavity cross section, and basal area is increased gradually by little.

Another feature of the present utility model is: water between cup and the cross gate and be provided with crescent funiclar curve running channel, the inlet and the outlet of crescent funiclar curve running channel interlace.

The utility model high quality and low cost aluminium piston gravity-assist pouring metal pattern combines in the metal pattern snakelike, the characteristics of gooseneck shape and inclination sprue, design crescent funiclar curve running channel matches with fan-shaped clearance type cross gate, and the cavity structure that gradually changes of metal pattern wall thickness, make molten metal water fashionable from watering rim of a cup, molten metal can be full of whole running channel, be difficult for bringing into air, be difficult for causing and splash, and enter feeding head reposefully along the running channel that sectional area changes with higher temperature and speed, by the clearance type cross gate time, molten metal has tangible buffering, reaches that to fill type steady, order exhaust and comparatively ideal deslagging effect.When molten metal enters die cavity by ingate, will be from the side and along the foundry goods whole height, vertically little by little enter die cavity, in molten metal filling die cavity process, the liquid level in the die cavity is lower than the liquid level in the feeding head all the time, has guaranteed that die cavity upper metal liquid is in the higher temperature state.By the performance of die cavity die wall accumulation of energy ability, molten metal cooling order is rationally arranged, and makes foundry goods reach consecutive solidification, the purpose of crystal grain thinning.

The utility model high quality and low cost aluminium piston gravity-assist pouring metal pattern is applied widely, except that suitable general different structure aluminum piston blank moulding, also is applicable to cacoplastic piston blank casting, as: the incomplete S195 type of piston seam portion perisporium piston; The E0140 type piston of two anti-steel discs that rise of piston-pin boss perisporium insert; The big pistons of shaping difficulty such as X2015B type piston of piston Wai Yuan skirt section and bottom, combustion chamber wall thickness difference great disparity all can adopt this structural metal mould.The foundry goods matter that adopts this metal pattern to obtain is good and stable, and appearance profile is clear smooth, and internal crystallization is organized fine and closely woven; improved the blank inherent quality; the foundary loss rate descends greatly, and only about 3%, casting technique yield rate height; liquid alloy and Fuel Consumption are little; mould structure is simple, is convenient to make, and is easy to safeguard; handled easily, long service life.

Concrete structure of the present utility model is provided in detail by the following drawings and embodiment.

Fig. 1 is the utility model structural representation.

Embodiment: can be clear that from Fig. 1, this metal pattern is made up of external mold (1), core (2), bed die (3), base (4), running and feeding system comprises waters cup (5), cross gate (6) and feeding head (7), the cross gate (6) that waters between cup (5) and the feeding head (7) is fan-shaped clearance type structure, the last horizontal line (8) of cross gate (6) is higher than blank moulding upper surface (14), cross gate (6) sectional area does not everywhere wait, and waters glass cross gate (9) cross-sectional area that (5) inlet arrival feeding heads (7) are located certainly by diminishing greatly gradually; To a left side, the wall thickness of external mold (1) is by thin progressive additive from right (ingate place) for the cross section of the die cavity (13) that is made of external mold (1) and core (2), and basal area is by little increase gradually.When making casting of molten metal, molten metal can be full of whole running channel, does not bring air into, does not cause and splashes, establish a crescent funiclar curve running channel (10) watering between cup (5) and the cross gate (6), the inlet (11) of crescent funiclar curve running channel (10) with export (12) and interlace.

Claims

1, a kind of high quality and low cost aluminium piston gravity-assist pouring metal pattern of being made up of external mold (1), core (2), bed die (3), base (4), its running and feeding system comprise and water cup (5), cross gate (6) and feeding head (7), it is characterized in that:

A) cross gate (6) that waters between cup (5) and the feeding head (7) is fan-shaped clearance type structure, the last horizontal line (8) of cross gate (6) is higher than blank moulding upper surface (14), cross gate (6) sectional area does not everywhere wait, and waters glass cross gate (6) cross-sectional area that (5) inlet arrival feeding heads (7) are located certainly by diminishing greatly gradually;

B) to a left side, the wall thickness of external mold (1) is by thin progressive additive from right (ingate place) for the cross section of the die cavity (13) that is made of external mold (1) and core (2), and basal area is by little increase gradually.

2, high quality and low cost aluminium piston gravity-assist pouring metal pattern according to claim 1, it is characterized in that: water between cup (5) and the cross gate (6) and establish a crescent funiclar curve running channel (10), the inlet (11) of crescent funiclar curve running channel (10) interlaces with outlet (12).