CN103182479A

CN103182479A - Casting mold for vacuum pump box body

Info

Publication number: CN103182479A
Application number: CN2011104555956A
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: 2013-07-03
Anticipated expiration: 2031-12-30
Also published as: CN103182479B

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 vavuum pump casing casting die

Technical field

The present invention relates to a kind of vavuum pump casing casting die for aviation field.

Background technology

See also Fig. 1, vavuum pump casing 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.The client is complete to casting dimension precision prescribed height, flat appearance, clear-cut; The foundry goods dense internal organization, casting flaws such as pore-free, shrinkage porosite; The requirement castings material is alusil alloy, the tensile strength 〉=170Mpa of material correspondence, yield strength 〉=100Mpa, hardness 〉=75HB; And require under the 2bar air pressure, not have and leak; Again because the foundry goods uniform wall thickness in the 5-6mm interval, and exists many places wall thickness difference at the isolated thick big wall construction 101 more than 2 times; Therefore the casting difficulty of such foundry goods is bigger.Generally be to adopt full sand mold gravity foundry technology to produce at present both at home and abroad, there is following shortcoming in this technology: 1) surface roughness are bigger; 2) foundry goods interior tissue crystal grain is thick, and the foundry goods mechanical performance is relatively poor, and (the equal material cast properties of producing with sand casting can only reach tensile strength 〉=150Mpa, yield strength 〉=90Mpa, hardness 〉=60HB); 3) casting system is complicated; 4) the moulding sand consumption is big, and production environment is abominable; 5) production efficiency is low.

Summary of the invention

The objective of the invention is in order to overcome the deficiencies in the prior art, a kind of vavuum pump casing casting die be provided, with its cast the vavuum pump casing can avoid in the casting cycle producing splash, turbulent flow and make foundry goods produce casting flaws such as slag inclusion, pore, cold shut.

A kind of technical scheme that realizes above-mentioned purpose is: a kind of vavuum pump casing 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, make described upper impression mould and described lower impressions mould surround the swaging die of described casting die, the surface of the die cavity of the surface of the die cavity of described upper impression mould and described lower impressions mould constitutes the inner surface of described swaging die, forms the die cavity of described casting die between the inner surface of described inner chamber core and swaging die;

A cup that stretches out described swaging die is set on the described lower impressions mould; In described swaging die, along the both sides of described die cavity the direct current running channel is set, described direct current running channel axially is communicated with described cup, and described direct current running channel radially is communicated with described die cavity by ingate, between described die cavity and the described cup satrain relief is set.

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

Further, described ingate is the clearance type ingate.

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

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

Adopted the technical scheme of a kind of vavuum pump casing casting die of the present invention, namely on the described mo(u)ld bottom half die cavity cup that stretches out described swaging die has been set.Its technique effect is: avoided owing to molten metal splashing and turbulent flow in casting cycle, so the vavuum pump box casting can not produce casting flaws such as slag inclusion, pore, cold shut; Be easy to discharge at the gas in die cavity described in the process of casting simultaneously, exhaust effect is fine, has avoided casting flaws such as the generation of vavuum pump box casting is felt suffocated, misrun.

Description of drawings

Fig. 1 is the structural representation of vavuum pump casing.

Fig. 2 a is the core overview of a kind of vavuum pump casing casting die of the present invention.

Fig. 2 b is the core front view of a kind of vavuum pump casing casting die of the present invention.

Fig. 2 c is the core left view of a kind of vavuum pump casing casting die of the present invention.

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

Fig. 3 is the matched moulds schematic diagram of a kind of vavuum pump casing casting die of the present invention.

Fig. 4 a is the structural representation of looking up of a kind of vavuum pump casing casting die of the present invention.

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

Fig. 5 is direct current running channel and the cast gate schematic cross-section of a kind of vavuum pump casing casting die of the present invention.

The specific embodiment

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

See also 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, make described upper impression mould 2 and described lower impressions mould 1 surround the swaging die 4 of described casting die, the surface of the die cavity of the surface of the die cavity of described upper impression mould 2 and described lower impressions mould 1 constitutes the inner surface of described swaging die 4, described inner chamber core 3 places in the space that the die cavity of the die cavity of described upper impression mould 2 and described lower impressions mould 1 constitutes, and forms the die cavity 42 of described casting die between the inner surface of described inner chamber core 3 and described swaging die 4.The axial length that an improvement of a kind of casting die of the present invention is described lower impressions mould 1 like this, a cup 11 (not showing among Fig. 4 b) that stretches out described swaging die 4 occurred greater than the length of described upper impression mould 2 on the described lower impressions mould 1; 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 axially is communicated with, described direct current running channel radially is communicated with by described die cavity 42 by ingate 44, described ingate 44 is the clearance type ingate, between described die cavity 42 and the described cup 11 satrain relief 43 is set.

She Ji purpose is like this: in the process that described casting die verts, be that described direct current running channel 41 becomes perpendicular to the level ground from being parallel to described level ground, described cup 11 is transferred in the process at top of described casting die, molten metal after the fusion injects the die cavity of described casting die stably, avoided owing to molten metal splashing and turbulent flow in casting cycle, and made the vavuum pump box casting produce casting flaws such as slag inclusion, pore, cold shut; Simultaneously in the process that mould verts, described ingate 44 and described satrain relief 43 can forward eminence along with verting of described casting die to, and described ingate 44 and described satrain relief 43 openings are bigger, gas in die cavity 42 described in the process of casting is easy to discharge, exhaust effect is fine, has avoided casting flaws such as the generation of vavuum pump box casting is felt suffocated, misrun.

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

See also 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, be provided with some chills 31 in the described inner chamber core 3, described chill 31 is be to increase the local cooling velocity of foundry goods, sand mold, core surface embedding or die cavity in the metal Quench thing laid.3 position is corresponding to the position at isolated thick big wall construction 101 place on described vavuum pump casing 100 in described inner chamber core for described chill 31, and She Ji purpose is like this: solved the vavuum pump box casting and isolated the technical problem that there are defectives such as shrinkage porosite, pore in thick big wall construction 101 places.

A kind of vavuum pump casing casting die among the present invention, described upper impression 2 and described lower impressions mould 1 are all made by metal material.She Ji purpose is like this: adopt metal to make described upper impression mould 1 and described lower impressions mould 2, cooperate with described inner chamber core 3, because metal has favorable cooling effect, use a kind of casting die of the present invention than the castings material density height of full sand mold die casting, good airproof performance, good mechanical property, the dimensional accuracy height; And saved a large amount of molding sand than sand casting, energy-saving effect is remarkable.

See also Fig. 4 and Fig. 6, the quality of cup described in the present invention 11 molten metal of containing is that vavuum pump box casting weight adds the above vavuum pump box casting cast gate and rising head weight sum.Described vavuum pump box casting cast gate and rising head are that described vavuum pump box casting is at the clout at described ingate 44 and described satrain relief place.Sprue designs according to described vavuum pump box casting thermal center and feeding needs, and the internal diameter of described direct current running channel 11 is Φ 60mm, and the internal diameter of described ingate is made as 5mm.

Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.

Claims

1. vavuum pump casing 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, make described upper impression mould (2) and described lower impressions mould (1) surround the swaging die (4) of described casting die, the surface of the die cavity of the surface of the die cavity of described upper impression mould (2) and described lower impressions mould (1) constitutes the inner surface of described swaging die (4), form the die cavity (42) of described casting die between the inner surface of described inner chamber core (3) and swaging die (4), it is characterized in that:

A cup (11) that stretches out described swaging die (4) is set on the described lower impressions mould (1); In described swaging die (4), both sides along described die cavity (42) arrange direct current running channel (41), described direct current running channel (41) axially is communicated with described cup (11), described direct current running channel (41) radially is communicated with described die cavity (42) by ingate (44), between described die cavity (42) and the described cup (11) satrain relief (43) is set.

2. a kind of vavuum pump casing casting die according to claim 1 is characterized in that: some chills (31) are set in the described inner chamber core (3).

3. a kind of vavuum pump casing casting die according to claim 1 and 2, it is characterized in that: described ingate (44) is the clearance type ingate.

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

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