CN103182479B

CN103182479B - Casting mold for vacuum pump box body

Info

Publication number: CN103182479B
Application number: CN201110455595.6A
Authority: CN
Inventors: 陈灵巧
Original assignee: Shanghai Aishida Automotive Components Co Ltd
Current assignee: Shanghai Aishida Automotive Components Co Ltd
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2015-01-28
Anticipated expiration: 2031-12-30
Also published as: CN103182479A

Abstract

The invention discloses a casting mold for a vacuum pump box body in the aviation field. The casting mold comprises an upper cavity mold, a lower cavity mold and an inner cavity sand core, wherein both the upper cavity mold and the lower cavity mold respectively comprise a mold cavity, so that the upper cavity mold and the lower cavity mold encircle to form a cavity mold of the casting mold, the surface of the mold cavity of the upper cavity mold and the surface of the mold cavity of the lower cavity mold form the inner surface of the cavity mold, and a cavity of the casting mold is formed between the inner cavity sand core and the inner surface of the cavity mold; the lower cavity mold is provided with a pouring cup stretching out of the cavity mold; and in the cavity mold, straight pouring runners are arranged along two sides of the cavity, the straight pouring runner is axially communicated with the pouring cup, the straight pouring runner is communicated with the cavity in the radial direction through an inner pouring gate, and an overflow feed head is arranged between the cavity and the pouring cup.

Description

A kind of vacuum pump box body casting die

Technical field

The present invention relates to a kind of vacuum pump box body casting die for aviation field.

Background technology

Refer to Fig. 1, vacuum pump box body 100 is critical components of vavuum pump, and it is a foundry goods, and its outline is for being about the rectangular box of 230mm × 170mm × 95mm.Client is high to casting dimension precision prescribed, flat appearance, clear-cut are complete; Cast-internal dense structure, the casting flaw such as pore-free, shrinkage porosite; Requirement castings material is alusil alloy, tensile strength >=170Mpa that material is corresponding, yield strength >=100Mpa, hardness >=75HB; And require No leakage under 2bar air pressure; Again because foundry goods uniform wall thickness is interval at 5-6mm, and there is the isolated thick large wall construction 101 of many places Wall-Thickness Difference more than 2 times; Therefore the casting difficulty of such foundry goods is larger.Be generally adopt full sand mold gravity foundry technology to produce at present both at home and abroad, there is following shortcoming in this technique: 1) surface roughness are larger; 2) cast-internal organizes coarse grains, foundry goods mechanical performance poor (cast properties of equal material sand casting production can only reach tensile strength >=150Mpa, yield strength >=90Mpa, hardness >=60HB); 3) casting system is more complicated; 4) moulding sand consumption is large, and production environment is severe; 5) production efficiency is low.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, a kind of vacuum pump box body casting die be provided, with its cast vacuum pump box body can be avoided in casting cycle produce splash, turbulent flow and make foundry goods produce the casting flaw such as slag inclusion, pore, cold shut.

A kind of technical scheme realizing above-mentioned purpose is: a kind of vacuum pump box body casting die, described casting die comprises upper impression mould, lower impressions mould and inner chamber core, described upper impression mould and lower impressions mould include a die cavity, described upper impression mould and described lower impressions mould is made to surround the swaging die of described casting die, the surface of the surface of the die cavity of described upper impression mould and the die cavity of described lower impressions mould forms the inner surface of described swaging die, forms the die cavity of described casting die between described inner chamber core and the inner surface of swaging die;

Described lower impressions mould arranges the cup that is stretched out described swaging die; In described swaging die, the both sides along described die cavity arrange direct current running channel, and described direct current running channel is axially communicated with described cup, and described direct current running channel is communicated with described die cavity radial through ingate, arranges satrain relief between described die cavity and described cup.

Further, in described inner chamber core, some chills are set.

Further, described ingate is clearance type ingate.

Further, described upper impression mould and described lower impressions mould are all made up of metal material.

Further, described inner chamber core is that 50 to 100 object precoated sands are made by particle diameter.

Have employed the technical scheme of a kind of vacuum pump box body casting die of the present invention, namely described mo(u)ld bottom half die cavity arranges the cup that is stretched out described swaging die.Its technique effect is: avoid due to the splashing of molten metal in casting cycle and turbulent flow, therefore vacuum pump box body foundry goods can not produce the casting flaws such as slag inclusion, pore, cold shut; Gas simultaneously in die cavity described in the process in casting is easy to discharge, and exhaust effect is fine, avoids the casting flaws such as the generation of vacuum pump box body foundry goods is felt suffocated, misrun.

Accompanying drawing explanation

Fig. 1 is the structural representation of vacuum pump box body.

Fig. 2 a is the core overview of a kind of vacuum pump box body casting die of the present invention.

Fig. 2 b is the core front view of a kind of vacuum pump box body casting die of the present invention.

Fig. 2 c is the core left view of a kind of vacuum pump box body casting die of the present invention.

Fig. 2 d is the A-A face sectional view of Fig. 2 b.

Fig. 3 is the matched moulds schematic diagram of a kind of vacuum pump box body casting die of the present invention.

Fig. 4 a be a kind of vacuum pump box body casting die of the present invention look up structural representation.

Fig. 4 b is the fragmentary top TV structure schematic diagram of a kind of vacuum pump box body casting die of the present invention.

Fig. 5 is direct current running channel and the runner section schematic diagram of a kind of vacuum pump box body casting die of the present invention.

Detailed description of the invention

Refer to Fig. 2 a to Fig. 5, in order to understand technical scheme of the present invention better, be described in detail by reference to the accompanying drawings below by embodiment particularly:

Refer to Fig. 3, Fig. 4 a and Fig. 4 b, a kind of vavuum pump casting die of the present invention, comprise upper impression mould 2, lower impressions mould 1 and inner chamber core 3, described upper impression mould 2 and lower impressions mould 1 include a die cavity, described upper impression mould 2 and described lower impressions mould 1 is made to surround the swaging die 4 of described casting die, the surface of the surface of the die cavity of described upper impression mould 2 and the die cavity of described lower impressions mould 1 forms the inner surface of described swaging die 4, in the space that the die cavity of die cavity and described lower impressions mould 1 that described inner chamber core 3 is placed in described upper impression mould 2 is formed, the die cavity 42 of described casting die is formed between described inner chamber core 3 and the inner surface of described swaging die 4.An improvement of a kind of casting die of the present invention is the length that the axial length of described lower impressions mould 1 is greater than described upper impression mould 2, like this, described lower impressions mould 1 there is a cup 11 (not showing in Fig. 4 b) stretching out described swaging die 4; In described swaging die 4, both sides along described die cavity 42 arrange direct current running channel 41, the described cup 11 that described direct current running channel 41 is axially communicated with, described direct current running channel is communicated with by described die cavity 42 radial through ingate 44, described ingate 44 is clearance type ingate, arranges satrain relief 43 between described die cavity 42 and described cup 11.

The object of such design is: in the process that described casting die verts, namely described direct current running channel 41 becomes perpendicular to level ground from being parallel to described level ground, described cup 11 is transferred in the process at the top of described casting die, molten metal after melting injects the die cavity of described casting die stably, avoid due to the splashing of molten metal in casting cycle and turbulent flow, and make vacuum pump box body foundry goods produce the casting flaws such as slag inclusion, pore, cold shut; In the process of simultaneously verting at mould, described ingate 44 and described satrain relief 43 can forward eminence to along with described verting of casting die, and described ingate 44 and described satrain relief 43 opening larger, gas in die cavity 42 described in the process of casting is easy to discharge, exhaust effect is fine, avoids the casting flaws such as the generation of vacuum pump box body foundry goods is felt suffocated, misrun.

In the present embodiment, described inner chamber core 3 is also positioned by the positioner 12 be arranged at respectively in the die cavity of positioner (not shown) in the die cavity of described upper impression mould 1 and described upper impression mould 1.

Refer to Fig. 2 a to Fig. 2 d and Fig. 4 and Fig. 5, an improvement of a kind of casting die of the present invention is described inner chamber core 3, some chills 31 are provided with in described inner chamber core 3, described chill 31 is increase foundry goods Local cooling speed, the metal chills thing laid in embedding or die cavity on sand mold, core surface.Described chill 31 in described inner chamber core 3 position correspond to the position at isolated thick large wall construction 101 place in described vacuum pump box body 100, the object of design is like this: solve vacuum pump box body foundry goods and isolating thick large wall construction 101 place and exist the technical problem of the defect such as shrinkage porosite, pore.

A kind of vacuum pump box body casting die in the present invention, described upper impression 2 and described lower impressions mould 1 are all made up of metal material.The object of such design is: adopt metal to make described upper impression mould 1 and described lower impressions mould 2, coordinate with described inner chamber core 3, because metal has good cooling effect, the castings material density using a kind of casting die of the present invention to cast than full sand mold mould is high, good airproof performance, good mechanical property, dimensional accuracy is high; And save a large amount of molding sand than sand casting, energy-saving effect is remarkable.

Refer to Fig. 4 and Fig. 5, cup 11 described in the present invention contain molten metal quality be that vacuum pump box body casting weight adds described vacuum pump box body casting sprue and rising head weight sum.Described vacuum pump box body casting sprue and rising head are described vacuum pump box body foundry goods at the clout at described ingate 44 and described satrain relief place.Sprue needs to design according to described vacuum pump box body foundry goods thermal center and feeding, and the internal diameter of described direct current running channel 11 is Φ 60mm, and the internal diameter of described ingate is set to 5mm.

Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.

Claims

1. a vacuum pump box body casting die, described casting die comprises upper impression mould (2), lower impressions mould (1) and inner chamber core (3), described upper impression mould (2) and lower impressions mould (1) include a die cavity, described upper impression mould (2) and described lower impressions mould (1) is made to surround the swaging die (4) of described casting die, the surface of the surface of the die cavity of described upper impression mould (2) and the die cavity of described lower impressions mould (1) forms the inner surface of described swaging die (4), the die cavity (42) of described casting die is formed between described inner chamber core (3) and the inner surface of swaging die (4), it is characterized in that:

Described lower impressions mould (1) is arranged the cup (11) that is stretched out described swaging die (4); In described swaging die (4), both sides along described die cavity (42) arrange direct current running channel (41), described direct current running channel (41) is axially communicated with described cup (11), described direct current running channel (41) is communicated with described die cavity (42) radial through ingate (44), arranges satrain relief (43) between described die cavity (42) and described cup (11);

In the process that casting die verts, described ingate (44) and described satrain relief (43) can forward eminence to along with described verting of casting die, and the internal diameter of described ingate is 5mm.

2. a kind of vacuum pump box body casting die according to claim 1, is characterized in that: arrange some chills (31) in described inner chamber core (3).

3. a kind of vacuum pump box body casting die according to claim 1 and 2, is characterized in that: described ingate (44) is clearance type ingate.

4. a kind of vacuum pump box body casting die according to claim 1 and 2, is characterized in that: described upper impression mould (2) and described lower impressions mould (1) are all made up of metal material.

5. a kind of vacuum pump box body casting die according to claim 1 and 2, is characterized in that: described inner chamber core (3) is that 50 to 100 object precoated sands are made by particle diameter.