CN101298091A

CN101298091A - Low pressure multiple-core casting technique of engine V6 aluminum cylinder

Info

Publication number: CN101298091A
Application number: CNA2008100625604A
Authority: CN
Inventors: 刘永跃
Original assignee: NINGBO HELI MOULD TECHNOLOGY Co Ltd
Current assignee: NINGBO HELI MOULD TECHNOLOGY Co Ltd
Priority date: 2008-06-17
Filing date: 2008-06-17
Publication date: 2008-11-05

Abstract

The invention discloses a low-pressure core assembly casting technique for V6 aluminum cylinder-block of engines, which is used for casting V6 aluminum cylinder-block of automobile engines. The casting technique adopted combines a low-pressure casting method and a core assembly method; the three-dimensional modeling of products is firstly carried out; according to the shape of the cast product, a crankcase is determined to be downwards and the aluminum liquid is let in from the baffle of the crankcase during casting course; the position of the sprue is selected and the size of the sprue is determined; a casting simulation software is adopted to carry out a simulation casting, the defects that are possible to occur are analyzed and a technical design scheme is made according to the analytic result, which essentially comprises the steps of : 1) making cores; 2) combining sand cores into a sand core group (6); 3) casting under low pressure. The casting technique of the invention can adopt flexible core assembly modes according to different shapes of engine blocks to produce aluminum cylinder-block cast products which are complex and of fine quality and has thin wall, meanwhile, the casting technique is applicable to the mass production with automatic production lines, thus having the advantages of low cost, high efficiency and high qualification rate.

Description

The low pressure core assembly casting technique of engine V6 aluminum cylinder

Technical field

The present invention relates to the metal casting technical field, especially relate to the low-pressure casting process that automobile engine cylinder-body adopts acieral.

Background technology

Automobile engine aluminum cylinder complex structure, the wall thickness great disparity is big, and the casting difficulty is big; The engine aluminum cylinder block casting major part of China is to adopt Hpdc at present, because Hpdc is very high to the material and the heat treatment requirements of mould, the input of exploitation die casting is very big; And for the aluminum cylinder of engine V6, because of the complicated especially foundry goods of its shape, periphery has the water cavity and the oil pocket of multilayer, causes many die cavities parts not finish by loosing core, and therefore also can't adopt high-pressure casting.It is to adopt sand casting that aluminum cylinder is cast another kind of mode, because the limitation of the mode of type and feeding is filled in sand casting, also can't produce complex-shapedly, colory V6 aluminum cylinder foundry goods is so China can't produce the engine V6 aluminum cylinder that has multilayer water cavity and oil pocket voluntarily so far.

Summary of the invention

China the objective of the invention is in order to overcome the deficiency of above-mentioned prior art, a kind of low pressure core assembly casting technique of engine V6 aluminum cylinder is provided, so that can produce high-quality automobile engine V6 aluminum cylinder foundry goods voluntarily.

In order to realize the foregoing invention purpose, the technical solution used in the present invention is such: a kind of low pressure core assembly casting technique of engine V6 aluminum cylinder, utilize low pressure casting to fill type characteristics more stably, and sand mold excellent insulating performance helps the characteristics of thin-section casting moulding, adopt the casting technique of two kinds of methods combinations of low pressure casting and core assembly, comprising coremaking, add core print, running channel be set, technical factors such as slag trap, air discharge duct; Needs according to core manufacturing craft are made a plurality of cores to whole die cavity; The core group that forms a whole then is layering a plurality of cores; Again the integral sand core group is moved on the air injection machine; Through boosting pressurize, release, the cooling and the cleaning that move apart the core group of casting complete and carry out foundry goods.

Owing to adopted technique scheme, the low pressure core assembly casting technique of a kind of engine V6 aluminum cylinder of the present invention, can adopt core assembly mode flexibly according to different engine cylinder shapes, produce thin-walled, complicated, colory aluminum cylinder foundry goods, and suitable automatic production line produces in enormous quantities, it is low therefore to have a cost, the efficient height, the characteristics that qualification rate is high.

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1 is the structural representation behind the core kludge among the present invention.

Fig. 2 is the structural representation of core group among the present invention.

Fig. 3 is the core group structural representation after Fig. 2 anglec of rotation.

Among the figure: 1, the low pressure holding furnace, 2, stalk, 3, current divider, 4, the core assembly base plate, 5, die cavity, 6, the core group, 601, the upper cover plate core, 602, upper left oil passage sand core, 603, left side sand core of water jacket, 604, the rear end core, 605, water jacket connects core, 606, the crankcase core, 607, the bottom right oil passage sand core, 608, the chassis core, 609, the water pump core, 610, the inlet channel core, 611, on join core, 612, the front end core, 613, the right side core, 614, the back oil road core, 615, upper right oil duct is joined core, 616, crankcase chill core, 7, the upper pressing core plate, 8, clamp, 9, venthole, 10, the lock core rod, 11, locating piece, 12, carrying handle.

The specific embodiment

The low pressure core assembly casting technique of a kind of engine V6 aluminum cylinder of the present invention, utilize low pressure casting to fill type characteristics more stably, and sand mold excellent insulating performance helps the characteristics of thin-section casting moulding, the casting technique that adopts two kinds of methods of low pressure casting and core assembly to make up; At first carry out the three-dimensional modeling of product, according to the foundry goods shape of engine V6 aluminum cylinder, determine that crankcase is downward, cast is advanced aluminium liquid from the crankcase baffle plate; Select gate location and definite gate size; Utilization casting simulation softward is cast simulation, analyzes the defective that foundry goods may occur, and works out the technological design scheme according to analysis result then, specifically comprises:

1), coremaking

Said coremaking is that all die cavities are resolved into several cores, makes respectively; When decomposing core, consider combination and location between core, core print is set; The employing that the little core of part can not be provided with the core print location is provided with adhesive glassine tank, is connected on the adjacent big core with melt viscosity during core assembly; Shown in Fig. 1-2, present embodiment is that all die cavities are resolved into 26 cores, comprising: chassis core 608; Left and right side core 613; Left and right oil passage sand core 607 down; Three crankcase cores 606; Rear end core 604; Left and right sand core of water jacket 603; The left and right oil passage sand core 602 of going up; Water pump core 609; Front end core 612; Water jacket connects core 605; Inlet channel core 610; On join core 611; 601, two pole lock cores 10 of upper cover plate core, and back oil road core 614, a upper right oil duct are joined core 615 and three crankcase chill cores 616;

2), each core is combined into the core group

The die cavity reasonable Arrangement of all cores in the least possible core box, to reduce frock quantity, is enhanced productivity; When assembling core group, add technical factors such as chill, slag trap, air discharge duct; The detailed process of core assembly is as follows:

A. pre-core assembly: the chill at front end place is locked on the front end core 612 with clamp 8, use melt viscosity on front end core 612 in water pump core 609 and back oil road core, with inlet channel core 610 and on join core 611 usefulness melt viscosities on upper cover plate core 601, upper right oil duct is joined core 615 be bonded on the upper right oil passage sand core 602, three crankcase chill core 616 usefulness PURs are bonded at respectively on the crankcase core 607;

B. core assembly: put core assembly iron plate 4 earlier; Chassis core 608 is placed on the core assembly base plate 4; Put left and right side core 613 successively; Left and right oil passage sand core 607 down; Crankcase core 606; Rear end core 604; Left and right sand core of water jacket 603; The left and right oil passage sand core 602 of going up; Put the front end core 612 that is bonded with water pump core 609 again; The cover that discharges water again connects core 605; Put at last be bonded with inlet channel core 610 with on join the upper cover plate core 601 of core 611, just form a core group 6; Core group 6 is provided with venthole 9, carrying handle 12, and the lock core rod 10 and the locating piece 11 that are used for the core location.

3), low pressure casting

By shown in Figure 1, integral sand core group 6 is placed on the delivery track, be transported to the end face of low pressure holding furnace 1, core group 6 falls to being adjacent to current divider 3 then, presses central layer 7 to fall to compressing core group 6 at last, pours into a mould; Aluminium liquid during cast in the holding furnace 1 enters current divider 3 by stalk 2 from bottom to top under the gas pressure about 0.28Bar, and shunts ten ingates that enter on the chassis core 608 in current divider 3, is full of die cavity 5 then; Aluminium liquid is in pressurize release after about 180 seconds under the air pressure of the 0.35Bar left and right sides, and aluminium liquid descends, and finishes cast; The core group 6 that cast is good is transported to fettling shop, and dead head and burr are removed in the roasting sand removal, obtain qualified foundry goods.

Claims

1, a kind of low pressure core assembly casting technique of engine V6 aluminum cylinder is characterized in that: the casting technique that adopts two kinds of method combinations of low pressure casting and core assembly; At first carry out the three-dimensional modeling of product, according to the foundry goods shape of engine V6 aluminum cylinder, determine that crankcase is downward, cast is advanced aluminium liquid from the crankcase baffle plate; Select gate location and definite gate size; 1), coremaking utilization casting simulation softward is cast simulation, analyzes the defective that foundry goods may occur, and works out the technological design scheme according to analysis result then, specifically comprises:; 2), each core is combined into core group (6); 3), low pressure casting.

2, according to the low pressure core assembly casting technique of the said a kind of engine V6 aluminum cylinder of claim 1, it is characterized in that: said coremaking is that all die cavities are resolved into several cores, makes respectively; And core print is set on core or adhesive glassine tank is set.

3, according to the low pressure core assembly casting technique of the said a kind of engine V6 aluminum cylinder of claim 2, it is characterized in that: said all die cavities being resolved into several cores, is to resolve into 26 cores, comprising: chassis core (608); Left and right side core (613); Left and right oil passage sand core (607) down; Three crankcase cores (606); Rear end core (604); Left and right sand core of water jacket (603); The left and right oil passage sand core (602) of going up; Water pump core (609); Front end core (612); Water jacket connects core (605); Inlet channel core (610); On join core (611); Upper cover plate core (601), two pole lock cores (10), and a back oil road core (614), upper right oil duct are joined core (615) and three crankcase chill cores (616).

4, according to the low pressure core assembly casting technique of the said a kind of engine V6 aluminum cylinder of claim 1, it is characterized in that: said each core is combined into core group (6), detailed process is as follows:

A. pre-core assembly: the chill at front end place is locked on the front end core (612) with clamp (8), use melt viscosity on front end core (612) in water pump core (609) and back oil road core, with inlet channel core (610) and on join core (611) with melt viscosity on upper cover plate core (601), upper right oil duct is joined core (615) be bonded on the upper right oil passage sand core (60), three crankcase chill cores (616) are bonded at respectively on the crankcase core (607) with PUR;

B. core assembly: put core assembly iron plate (4) earlier; Chassis core (608) is placed on the core assembly base plate (4); Put left and right side core (613) successively; Left and right oil passage sand core (607) down; Crankcase core (60); Rear end core (604); Left and right sand core of water jacket (603); The left and right oil passage sand core (602) of going up; Put the front end core (612) that is bonded with water pump core (609) again; The cover that discharges water again connects core (605); Put at last be bonded with inlet channel core (610) with on join the upper cover plate core (601) of core (611).

5, according to the low pressure core assembly casting technique of the said a kind of engine V6 aluminum cylinder of claim 1, it is characterized in that: said low pressure casting is that integral sand core group (6) is placed on the delivery track, be transported to the end face of low pressure holding furnace (1), core group (6) falls to being adjacent to current divider (3) then, press central layer (7) to fall to compressing core group (6) at last, pour into a mould.

6, according to the low pressure core assembly casting technique of the said a kind of engine V6 aluminum cylinder of claim 5, it is characterized in that: said cast, aluminium liquid in the control holding furnace (1) is under the gas pressure about 0.28Bar, enter current divider (3) by stalk (2) from bottom to top, and in current divider (3), shunt ten ingates that enter on the chassis core (608), be full of die cavity (5) then; Aluminium liquid is in pressurize release after about 180 seconds under the air pressure of the 0.35Bar left and right sides, and aluminium liquid descends, and finishes cast.