CN209986182U

CN209986182U - Gravity casting device for manufacturing aluminum alloy shell

Info

Publication number: CN209986182U
Application number: CN201920729333.6U
Authority: CN
Inventors: 张志聪; 唐尚霖
Original assignee: Fujian Fengli Machinery Technology Co Ltd
Current assignee: Fujian Fengli Machinery Technology Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-01-24
Anticipated expiration: 2029-05-21

Abstract

The utility model provides a gravity casting device for manufacturing an aluminum alloy shell, which comprises a bottom die, a side die, an inner die liner, a sprue, a cross runner, an inner sprue, a die cavity and a hydraulic machine; the two groups of side molds are in sliding fit on the bottom mold under the action of the hydraulic press; the two groups of side dies are close to each other under the action of the hydraulic press, are finally folded, form a die cavity with the inner die liner, and form a riser at the upper end of each side die; the inner sprue is a slender gap which enables the aluminum liquid to pass through at a normal speed and prevents oxidation slag from passing through; the difference between the cross section area of the inner pouring gate and the cross section area of the inner pouring gate is not large, the speed of liquid entering a die cavity is guaranteed to be the same as that of the liquid entering the die cavity, and the phenomenon that the liquid is solidified in advance to cause the failure or poor quality of the manufactured product blank is avoided; and the size of the inner sprue is a slender gap of 90mm multiplied by 2mm, so that the oxidation slag can not enter a mold cavity, a filter screen is not required to be arranged on the gravity casting device, the internal structure is greatly simplified, and the manufacturing cost is saved.

Description

Gravity casting device for manufacturing aluminum alloy shell

Technical Field

The utility model relates to a gravity casting device of preparation aluminum alloy shell.

Background

The aluminum alloy shell can be manufactured by sand casting or gravity casting, a gravity casting mold can be repeatedly used, a casting can be obtained once when molten metal is poured once, the service life is long, and the production efficiency is high; the metal mold casting has good dimensional accuracy and smooth surface, and the strength of the casting is higher than that of the sand mold and is less prone to damage under the condition of pouring the same metal liquid. Therefore, in mass production of medium and small castings of nonferrous metals, gravity casting is generally preferred as long as the melting point of the casting material is not too high.

The phenomena of turnover, impact and splashing of molten metal during mold filling are reduced or avoided during gravity casting, so that the formation of oxidation slag is reduced, and meanwhile, the defects of castings are avoided or reduced by filtering the oxidation slag in molten aluminum, so that the quality of the castings is improved; it is now common to use external or internal filtration: firstly, external filtration is to filter the molten metal before the molten metal enters a sprue, and the defects are that the molten metal can splash when reaching the bottom of the device through the sprue, oxidation slag is generated, and the quality of a product is influenced; secondly, get into the sprue at the molten metal, after the oxidation sediment splashes, cross gate position installation filter screen, the molten metal that makes the entering flow gate has filtered the oxidation sediment, but this casting structure is complicated relatively, and the die sinking cost is high.

In addition, when the traditional gravity casting method is used, the more the product blank is close to the central part, the more the product blank is easy to loosen, the more the product blank is close to the top dead head, the more the product blank is easy to loosen, the pouring speed of the aluminum liquid needs to be well controlled, and waste products are extremely easy to generate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming above-mentioned defect, provide a simple structure's gravity casting device of preparation aluminum alloy shell.

The utility model adopts the following technical scheme:

a gravity casting device for manufacturing an aluminum alloy shell comprises a bottom die, a side die, an inner die liner, a sprue, a cross runner, an inner sprue, a die cavity and a hydraulic machine; the two groups of side molds are in sliding fit on the bottom mold under the action of the hydraulic press; the two groups of side dies are close to each other under the action of the hydraulic press, are finally folded, form a die cavity with the inner die liner, and form a riser at the upper end of each side die; the method is characterized in that: the ingate is a slender gap through which the oxidized slag cannot pass.

A gravity casting device for manufacturing an aluminum alloy shell is provided, wherein the size of an inner pouring gate is 90mm multiplied by 2 mm;

a gravity casting device for manufacturing aluminum alloy shells is characterized in that a straight pouring gate is a snake-shaped straight pouring gate.

A gravity casting device for manufacturing an aluminum alloy shell is provided, wherein the radius of an inner container of an inner die is reduced.

A gravity casting device for manufacturing an aluminum alloy shell is characterized in that a heightened riser is arranged on a side die.

The inner sprue is a slender gap through which oxidation slag cannot pass, the length of the inner sprue is longer, the width of the inner sprue is narrower, but the difference of the cross section area of the inner sprue is not large compared with that of the traditional sprue, the speed of liquid entering a mold cavity is ensured to be the same as that of the traditional sprue, and the problem that a product blank is failed to be manufactured or the quality of the product blank is poor due to early solidification of aluminum liquid is avoided; and the size of the inner sprue is a slender gap of 90mm multiplied by 2mm, so that the oxidation slag can not enter a mold cavity, a filter screen is not required to be arranged on the gravity casting device, the internal structure is greatly simplified, and the manufacturing cost is saved.

The sprue is a snake-shaped sprue, so that when the aluminum liquid enters the sprue, the aluminum liquid is prevented from directly impacting the bottom die, splashing is reduced, and formation of oxidation slag is reduced.

The radius of the inner liner of the inner mold is reduced, so that the cavity of the mold is enlarged, and a riser is arranged on the side mold; because the product blank is easy to be loose near the inner container of the inner die, and the blank is easy to be loose near the riser, the two loose parts are arranged at the positions where the product blank needs to be processed, and belong to the parts to be cut off, the flaws of the finished product can be effectively reduced through the arrangement of the two loose parts, the pouring speed of the aluminum liquid is not required to be controlled accurately, and the operation difficulty is reduced.

To sum up, the utility model discloses the cost of manufacture is low, convenient to use, and work efficiency obtains effectual improvement.

Drawings

Fig. 1 is an overall schematic view of the present invention.

Fig. 2 is a partial enlarged view of the present invention.

Fig. 3 is a schematic diagram of the present invention.

Fig. 4 is a schematic diagram of the present invention.

Detailed Description

In order to make the purpose and technical solution of the present invention clearer, the following description is made with reference to the accompanying drawings and embodiments to further explain the present invention:

the gravity casting device for manufacturing the aluminum alloy shell as shown in fig. 1 to 3 comprises a bottom die 1, a side die 2, an inner die inner container 3, a sprue 4, a cross runner 5, an ingate 6, an ingate 61, a die cavity 7 and a hydraulic machine 8.

The side die 2 is provided with a sprue 4, the bottom die 1 is provided with a cross runner 5, the inner die liner 3 is fixed on the bottom die 1 and is provided with an ingate 6, and the ingate is provided with an ingate 61.

The two groups of side moulds 2 are in sliding fit on the bottom mould under the action of the hydraulic machine 8; the two groups of side dies 2 are close to each other under the action of the hydraulic press 8, and finally close to each other to form a die cavity 7 with the inner die liner 3, and a dead head 21 is formed at the upper end of each side die 2.

The first embodiment is as follows:

firstly, operating a hydraulic machine 8 to enable two groups of side molds 2 to approach each other on a bottom mold 1 until the side molds are tightly folded; a mould cavity 7 is formed between the two groups of side moulds 2 and the inner mould liner 3, and a riser 21 is formed at the upper end of each side mould 2.

And secondly, pouring the aluminum liquid into the sprue 4, and when the aluminum liquid reaches the sprue 4, the aluminum liquid flows to the ingate 6 along the cross gate 5 and gradually fills up the ingate.

Thirdly, the aluminum liquid enters the die cavity through the inner pouring gate 61 until the aluminum liquid is filled in the die cavity, and finally a product blank is formed; the size of the inner gate 61 is 90mm multiplied by 2 mm; the size of the traditional inner gate 61 is 40mm multiplied by 5mm, a filter screen needs to be arranged between the cross gate 5 and the inner gate 61 to filter the oxidation slag, the size of the novel improved inner gate 61 is 90mm multiplied by 2mm, the difference of the cross section area is not large compared with the traditional size, the speed of liquid entering a die cavity is ensured to be the same as the traditional size, and the phenomenon that the liquid is solidified in advance to cause the failure of manufacturing a product blank is avoided; the size of the inner sprue 61 is 90mm multiplied by 2mm, and the oxidation slag can not enter the mold cavity 7, so that the gravity casting device does not need to be provided with a filter screen, the internal structure is greatly simplified, and the manufacturing cost is saved.

Fourthly, after solidification and forming, the two groups of side dies 2 are opened by operating the hydraulic press 8, the product blank is taken out, and the hollow part of the product blank is bored by applying a numerical control machining center.

Example two:

Secondly, pouring the aluminum liquid into the sprue 4, and when the aluminum liquid reaches the sprue 4, the aluminum liquid flows to the ingate 6 along the cross gate 5 and gradually fills up; the sprue 4 is a snake-shaped sprue, so that when the aluminum liquid enters the sprue 4, the aluminum liquid is prevented from directly impacting the bottom die 1, splashing is reduced, and formation of oxidation slag is reduced.

Thirdly, the aluminum liquid enters the die cavity through the inner pouring gate 61 until the aluminum liquid is filled in the die cavity, and finally a product blank is formed; the dimensions of the ingate 61 are 90mm × 2 mm.

Example three:

firstly, operating a hydraulic machine 8 to enable two groups of side molds 2 to approach each other on a bottom mold 1 until the side molds are tightly folded; a mould cavity 7 is formed between the two groups of side moulds 2 and the inner mould liner 3, and a riser 21 is formed at the upper end of each side mould 2; the radius of the inner mold liner 3 is reduced, so that the mold cavity is enlarged, and a riser 22 is arranged on the side mold 2 (as shown in fig. 4); because the product blank is easy to be loosened near the inner die liner 3 and the blank is easy to be loosened near the riser 21, the two parts are arranged to ensure that the loosening part is positioned at the part of the product blank to be processed and belongs to the part to be cut off, and the defects of the finished product can be effectively reduced through the arrangement of the two parts.

Fourthly, after solidification and forming, the two groups of side dies 2 are opened by operating the hydraulic press 8, the product blank is taken out, the heightened part of the product blank is cut off by applying a band saw machine tool, and then the hollow part of the product blank is bored by applying a numerical control machining center.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still belong to the protection scope of the present invention.

Claims

1. A gravity casting device for manufacturing an aluminum alloy shell comprises a bottom die, a side die, an inner die liner, a sprue, a cross runner, an inner sprue, a die cavity and a hydraulic machine; the two groups of side molds are in sliding fit on the bottom mold under the action of the hydraulic press; the two groups of side dies are close to each other under the action of the hydraulic press, are finally folded, form a die cavity with the inner die liner, and form a riser at the upper end of each side die; the method is characterized in that: the ingate is a slender gap through which the oxidized slag cannot pass.

2. A gravity casting apparatus for making aluminum alloy shells according to claim 1, wherein: the dimensions of the ingate are 90mm x 2 mm.

3. A gravity casting apparatus for making an aluminum alloy shell according to claim 1 or 2, wherein: the sprue is a snake-shaped sprue.

4. A gravity casting apparatus for making an aluminum alloy shell according to claim 1 or 2, wherein: the radius of the inner container of the inner mold is reduced.

5. A gravity casting apparatus for making aluminum alloy shells according to claim 3, wherein: the radius of the inner container of the inner mold is reduced.

6. A gravity casting apparatus for making aluminum alloy shells according to claim 5, wherein: and a heightened riser is arranged on the side die.