CN103658528A

CN103658528A - Vacuum casting valve body sand mold structure

Info

Publication number: CN103658528A
Application number: CN201310724857.3A
Authority: CN
Inventors: 黄佳铭
Original assignee: SICHUAN DONGTAI CASTING INDUSTRY Co Ltd
Current assignee: SICHUAN DONGTAI CASTING INDUSTRY Co Ltd
Priority date: 2013-12-25
Filing date: 2013-12-25
Publication date: 2014-03-26

Abstract

The invention discloses a vacuum casting valve body sand mold structure, which comprises a sand mold body, wherein a mold cavity is arranged in the sand mold body; a mold core is arranged in the mold cavity; risers communicated with the mold cavity are arranged at coupling flanges at two ends of the molding valve body of the sand mold body; the left end and the right end of the mold core extend out to form core heads, wherein each core head is 150 mm in length; supplement parts are arranged at the risers. The mold core disclosed by the invention is lengthened, so that the mold core is compacted and stabilized; when the mold cavity is filled with molten steel, floating force is not enough to lift the mold core, so that the thicknesses of the upper wall and the lower wall are relatively uniform; as the supplement parts are arranged at the risers, the sizes of risers are increased, furthermore, a shrinkage cavity phenomenon is eliminated.

Description

V method casting valve body sand mould structure

Technical field

The invention belongs to V method casting technology field, particularly relate to a kind of V method casting valve body sand mould structure.

Background technology

At present, in casting check valve body, there is following technical problem: 1. when molten steel is filled with after the die cavity of sand mold, the buoyancy that molten steel produces can cause core floating, and then cause valve body upper wall partially thin, and lower wall is partially thick, even because wall thickness deviation is excessive, causes product rejection.2. sand mold rising head root has shrinkage cavity, needs a large amount of welding rods to carry out repair welding and fills and leads up, and causes waste in man-hour.3. the body cavity after moulding has scab phenomenon, cleaning difficulty, and severe patient cannot be cleared up and scrap.4. moulding valve body waist arc position scab, needs repair welding.

Summary of the invention

Object of the present invention is just to provide a kind of V method casting valve body sand mould structure, can solve the problem that above-mentioned prior art exists completely.

Object of the present invention realizes by following technical proposals:

A kind of V method casting valve body sand mould structure, comprise sand mold body, in sand mold body, there is die cavity, in die cavity, be provided with core, the position of sand mold body moulding valve body two ends terminal pad is provided with the rising head being communicated with die cavity, the overhanging core print in two ends, left and right of described core, the length dimension of this core print is 150mm, at rising head place, is provided with subsidy portion.

As preferably, the high 180mm * 400mm * 300mm that is of a size of of the length and width of described rising head.

As preferably, the die cavity thickness of described moulding valve body waist is 50mm.

As preferably, described subsidy portion vertical sectional shape is that chamfer is trapezoidal, and bottom width is of a size of 40.

As preferably, the described die cavity inwall for moulding valve body waist arc position is provided with chromite layer of sand.

As preferably, described core consists of internal layer, skin and face coat, and internal layer adopts water-glass sand to form, and outer is chromite sand formation, and face coat is Zircon powder alcohol group dope layer.

As preferably, described superficies applied in two coats Zircon powder alcohol group dope layer.

Compared with prior art, beneficial effect of the present invention is:

1. core length dimension lengthens, and makes core stabilization by compaction, and after molten steel filling die cavity, floating force is not enough to lift core, thereby makes upper and lower wall ratio more even.After tested, before heat treatment, wall thickness is 49.5-50mm, and lower wall thickness is 50-50.5mm, and after heat treatment, testing wall thickness is 46.5-47mm, and lower wall thickness is 47-47.5mm, meets national standard.

2. at rising head place, subsidy portion is set, thereby has increased Riser Dimensions, and then shrinkage cavity phenomenon is disappeared.

3. the body cavity after moulding is without scab phenomenon, and whole surface of internal cavity is very bright and clean, and roughness reaches Ra50, and some positions reach Ra12.5.

4. the valve body waist arc surface of position of moulding is bright and clean, and without scab phenomenon, roughness reaches Ra50, and some positions reach Ra12.5.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is the structural representation of core.

The specific embodiment

Below in conjunction with specific embodiments and the drawings, the present invention is further illustrated.

As shown in Figure 1, a kind of V method casting valve body sand mould structure, comprise sand mold body 1, in sand mold body 1, there is die cavity 2, in die cavity 2, be provided with core 3, the position of sand mold body 1 moulding valve body two ends terminal pad is provided with the rising head 4 being communicated with die cavity 2, the overhanging core print 5 in two ends, left and right of described core 3, the length dimension L of this core print 5 is 150mm, and at rising head, 4 places are provided with subsidy portion 6.

High 180mm * 400mm * the 300mm that is of a size of of length and width of described rising head 4.

The die cavity thickness H of described moulding valve body waist is 50mm.

Described subsidy portion 6 vertical sectional shapes are that chamfer is trapezoidal, and bottom width size W is 40.

The described die cavity inwall for moulding valve body waist arc position is provided with chromite layer of sand.

Referring to Fig. 2, described core 3 consists of internal layer 31, skin 32 and face coat 33, and internal layer 31 adopts water-glass sands to form, and outer 32 is that chromite sand forms, and face coat 33 is Zircon powder alcohol group dope layer.

Described outer 32 surperficial applied in two coats Zircon powder alcohol group dope layers.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.

Claims

1. a V method is cast valve body sand mould structure, comprise sand mold body, in sand mold body, there is die cavity, in die cavity, be provided with core, the position of sand mold body moulding valve body two ends terminal pad is provided with the rising head being communicated with die cavity, it is characterized in that: the overhanging core print in two ends, left and right of described core, the length dimension of this core print is 150mm, at rising head place, is provided with subsidy portion.

2. V method casting valve body sand mould structure according to claim 1, is characterized in that: the high 180mm of the being of a size of * 400mm * 300mm of length and width of described rising head.

3. V method casting valve body sand mould structure according to claim 1, is characterized in that: the die cavity thickness of described moulding valve body waist is 50mm.

4. V method according to claim 1 casting valve body sand mould structure, is characterized in that: described subsidy portion vertical sectional shape is that chamfer is trapezoidal, and bottom width is of a size of 40.

5. V method casting valve body sand mould structure according to claim 1, is characterized in that: the described die cavity inwall for moulding valve body waist arc position is provided with chromite layer of sand.

6. V method casting valve body sand mould structure according to claim 1, is characterized in that: described core consists of internal layer, skin and face coat, and internal layer adopts water-glass sand to form, and outer for chromite sand forms, face coat is Zircon powder alcohol group dope layer.

7. V method casting valve body sand mould structure according to claim 1, is characterized in that: described superficies applied in two coats Zircon powder alcohol group dope layer.