CN209918861U

CN209918861U - Composite graphite chill

Info

Publication number: CN209918861U
Application number: CN201920027476.2U
Authority: CN
Inventors: 卢记军; 李继常; 徐自立; 吴正喜
Original assignee: Wuhan Textile University
Current assignee: Wuhan Textile University
Priority date: 2019-01-08
Filing date: 2019-01-08
Publication date: 2020-01-10
Anticipated expiration: 2029-01-08

Abstract

The utility model relates to a compound graphite chiller, including graphite chiller core and metal chiller, graphite chiller core is located the inside of metal chiller, the metal chiller cladding is outside at graphite chiller. The metal chiller is completely coated outside the graphite chiller, or most of the metal chiller is coated outside the graphite chiller, so that a local graphite chiller core is exposed. The utility model discloses a compound chiller comprises graphite chiller and metal chiller two parts, has both possessed the high strength of metal chiller, has the characteristics that graphite chiller density is little, high heat conduction again. The utility model discloses a metal chiller can be cast iron, cast steel or cast aluminium isoalloy, and compound chiller wholeness is good, convenient operation, long service life.

Description

Composite graphite chill

Technical Field

The utility model relates to a chill foundry goods field, concretely relates to compound graphite chill.

Background

In the cooling and solidification process of the casting, the finally solidified part is easy to have the defects of shrinkage porosity, shrinkage cavity and the like, and the quality of the casting is seriously influenced. In the casting process, cold iron is usually matched with a riser for feeding a casting, so that the casting is directionally solidified, and the range of the shrinkage distance of the riser is enlarged; the casting is prevented from generating shrinkage cavity and cracks; the casting and the casting wall are solidified simultaneously, so that the solidification speed is increased; improve the wear resistance and the like. The chilling blocks can be classified into steel chilling blocks, cast iron chilling blocks, graphite chilling blocks and the like according to the material quality.

The cast iron chill has the widest application range, but has the defects of high density, high labor intensity during molding, easy deviation and slipping out during box turning or hoisting after molding, easy falling off of a molded sand-inclusion thin part and the like, and the surface brushing property of the chill is poor, so that the chill at the position of a casting with concentrated heat, close to a gate, is easy to melt and adhere to the casting; when more chills are laid, the chills expand when heated, local deformation of castings is easily caused, and therefore, the metal chills are limited in placement positions due to the fact that the metal chills have large dead weights and the density of the metal chills is several times that of casting molds, and the castings are easily collapsed due to the fact that the metal chills fall off from the side faces and the top faces of the castings, and accordingly the castings are scrapped. On the other hand, the metal chilling blocks are guaranteed not to fall off during demoulding, the spacing between the chilling blocks is generally larger than 30mm, the hardness of the machined surface of the casting is easy to be uneven, and obvious color difference exists after machining.

The graphite chiller has small density, only contains 1/4 of cast iron chills, has high heat conductivity and strong heat storage capacity which is 3-4 times of that of the cast iron chills, has high melting point, can not be brushed with paint and can not be bonded on a casting; the graphite has small thermal expansion coefficient, relatively difficult casting deformation and high refractoriness, and can effectively prevent the formation of oxidation pinholes; the graphite chill has the advantages of better feeding effect, reduction of the hardness of castings, improvement of the surface smoothness and the wear resistance of the castings, and the like, has better use effect than the graphite chill, can be used for multiple times, is rapidly developed, and more casting manufacturers popularize and use the graphite chill. A large number of practices also prove that the use effect of the graphite chiller is better than that of the cast iron chiller. The casting made of the graphite chill has smooth surface, easy sand removal, few defects and no sand adhesion phenomenon. The hardness of the two castings is detected, the hardness of the casting using the graphite chilling block is lower than that of the casting using the metal chilling block, the distance between the graphite chilling blocks can be set to be less than 10mm, the hardness difference can be effectively reduced, the internal quality of the casting is improved, and the color difference is eliminated.

With the use of graphite chills in large quantities, problems are also exposed in the process. The method mainly shows that the graphite chiller has low strength, the recycling times are few, the casting process cost is high, the shape-following graphite chiller is difficult to manufacture, the graphite chiller is not convenient to separate from a casting mold when shakeout is carried out after use, and the graphite chiller is not easy to recover and influences the production efficiency. If the feeding price of the cast iron chiller is 4500 yuan/t, and the feeding price of the graphite chiller is 15000-20000 yuan/t, the purchase cost of the graphite chiller with the same specification and size is 80% -100% of that of the cast iron chiller, which means that the use frequency of the chiller is large, and the use cost is low. The general cast iron chilling block can be used for 3-5 times, the graphite chilling block can be used for 1-10 times, the fluctuation is large, and the graphite chilling block fed back by part of casting enterprises can be used only once. In general, after molding and core making, mold closing and pouring are carried out, and after the casting mold is cooled to a certain temperature, the casting mold is crushed by a shakeout machine, so that the casting and the chill are separated from the sand mold. The cast iron chill is made of metal materials and is not easy to damage, and corners of the graphite chill are easy to damage after the graphite chill is broken and cast by a shakeout machine, so that the graphite chill cannot vibrate on the shakeout machine along with a casting when the box is opened, otherwise the graphite chill is easy to collapse or shake, the service life of the graphite chill is shortened, and the production cost of the casting is increased. And when adopting the pit molding, graphite chiller does not have ferromagnetism, can not use equipment such as electromagnetic chuck to retrieve, also makes the chiller retrieve and recycles the difficulty, uses methods such as grab bucket snatchs mostly to retrieve, has further aggravated the chiller damage, has increased use cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a composite graphite chill which has good integrity, convenient operation and long service life is provided.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

the utility model provides a compound graphite chiller, includes graphite chiller core and metal chiller, graphite chiller core is located the inside of metal chiller, the metal chiller cladding is outside at graphite chiller core.

Further, the metal chiller is completely coated outside the graphite chiller core body.

Further, graphite chill core is the cuboid form, and is provided with many protruding stupexes on upper surface and the lower surface, protruding stupefied upper surface on the graphite chill core upper surface and protruding stupefied lower surface on the lower surface expose with metal chill surface and with metal chill surface parallel and level.

Further, the graphite chiller core body is in a cuboid shape, the metal chiller is in an equal-thickness arc plate shape, and the metal chiller is completely wrapped outside the graphite chiller core body.

Further, the metal chill core can be in any shape that is compatible with the shape of the casting hot spot.

Furthermore, the graphite chill core body can adopt any shape which is suitable for the shape of a casting hot spot.

The utility model has the advantages that: the utility model discloses a compound chiller comprises graphite chiller and metal chiller two parts, has both possessed the high strength of metal chiller, has the characteristics that graphite chiller density is little, high heat conduction again. The metal chill of the utility model can be cast iron, cast steel or cast aluminum and the like, and the manufacturing method adopts the method of pouring molten metal coated graphite in a casting mould and compounding the graphite after partial cooling. The composite chilling block has good integrity, convenient operation and long service life.

Drawings

FIG. 1 is a schematic diagram of the outline structure of a conventional composite graphite chiller according to examples 1 and 2;

FIG. 2 is a schematic cross-sectional structural view of a conventional fully-cladded composite graphite chill of example 1;

FIG. 3 is a schematic perspective view of the graphite chiller core of example 1;

FIG. 4 is a schematic cross-sectional structural view of a conventional partially clad composite graphite chill of example 2;

FIG. 5 is a schematic perspective view of a graphite chill core according to example 2;

FIG. 6 is a schematic view of the configuration of the shaped composite graphite chill of example 3;

fig. 7 is a schematic sectional view of the special-shaped composite graphite chiller according to example 3.

In the drawings, the components represented by the respective reference numerals are listed as follows (three general cases):

1. metal chill; 2. a graphite chill core body; 3. convex arris

Detailed Description

The principles and features of the present invention are described below, with the examples being given only for the purpose of illustration and not for the purpose of limiting the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Example 1, conventional fully clad structural composite graphite chiller, as shown in fig. 1-3

In the composite graphite chiller with the full-coating structure prepared in the embodiment, the metal chiller 1 is completely coated outside the graphite chiller core body 2.

The preparation method of the composite graphite chiller of the embodiment 1 includes the following steps:

step 1, preparing a casting mold with a cavity arranged inside by using a chill mold sample; the chill pattern is used for forming a cavity of a casting mold and is adaptive to the shape of the composite chill; the pattern can be made of wood in small batch production, and can be made of aluminum alloy, plastic and other materials in large batch production; the casting mold can be clay sand, resin sand, sodium silicate sand, oil sand and the like, is molded by utilizing a chill mold sample after being mixed, and is prepared after being taken, wherein the casting mold comprises an upper sand mold and a lower sand mold, and the cavity is positioned between the upper sand mold and the lower sand mold.

Step 2, preparing a graphite chiller core body 2, wherein the graphite chiller core body 2 can be completely placed in a cavity; in this embodiment, the length, width and height of the graphite chill core body 2 are all smaller than the cavity.

The graphite can be cut into the required shape and size by commercial or self-made graphite blocks; and also from the leftovers of various carbon plants and the waste graphite electrodes of various steel plants. Because the processing performance of the graphite electrode is particularly good, the graphite electrode can be directly processed into graphite with a required shape by a saw, a planer, a lathe and the like; when the cold iron core of graphite is manufactured, water is adopted for flushing and dust reduction, and after the cold iron core of graphite is processed, the graphite is dried to constant weight at the temperature of 150-200 ℃ so as to prevent the wet graphite from generating air holes; the smaller the porosity of the graphite chilling block, the better; the thickness of the graphite chill core body 2 is such as to meet the requirements of the casting to be cooled.

Preparing a chaplet: is made of cast iron metal which is the same as the material of the outer side of the chilling block, and the surface of the chilling block is subjected to rust prevention treatment such as galvanizing.

Step 3: fixing the front and back surfaces, the left and right surfaces and the upper and lower surfaces of the graphite chill in a cavity through core supports, and then closing a sand mold;

and 4, smelting cast iron or cast steel or cast aluminum and other alloys, pouring the smelted molten metal into the cavity through a pouring system, wherein the pouring system generally comprises a pouring cup, a sprue, a cross runner and an inner runner, and the graphite chill core body 2 is wrapped after the molten metal enters the cavity. And after the casting is cooled and solidified, opening the box and shakeout, and cleaning a casting head, burrs and flashes to obtain the fully-coated structure composite graphite chill.

As shown in fig. 1 and fig. 4 to 5, in example 2 and the conventional partially-coated structure composite graphite chiller, a plurality of convex ridges 3 are arranged on the upper surface and the lower surface of the graphite chiller core 2, and the upper surface of the convex ridges 3 on the upper surface and the lower surface of the convex ridges 3 on the lower surface of the graphite chiller core 2 are exposed out of the outer surface of the metal chiller 1 and flush with the outer surface of the metal chiller 1. The preparation method of the composite graphite chiller of the embodiment 2 includes the following steps:

Step 2, preparing a graphite chiller core body 2, wherein the graphite chiller core body 2 can be completely placed in a cavity; in the embodiment, the length and width of the graphite chiller core body 2 are smaller than the cavity, the height of the graphite chiller core body is the same as that of the cavity, a plurality of convex ridges 3 are arranged on the upper surface and the lower surface of the prepared graphite chiller core body 2, the convex ridges 3 can support the graphite chiller core body 2 and replace the core support, grooves are formed between the convex ridges 3, and metal solution can flow in through the grooves and wrap the outer surface of the graphite chiller core body 2;

Step 3: after the graphite chilling block body 2 is placed in the cavity, the convex ribs 3 on the lower surface of the graphite chilling block body 2 are in contact with the cavity, and the upper surface of the convex ribs 3 on the upper surface of the graphite chilling block body 2 is flush with the upper surface of the cavity. The front and back surfaces and the left and right surfaces of the graphite chill core body 2 are fixed in the cavity through core supports, and then the sand mold is closed;

and 4, smelting cast iron or cast steel or cast aluminum and other alloys, pouring the smelted molten metal into the cavity through a pouring system, wherein the pouring system generally comprises a pouring cup, a sprue, a cross runner and an inner runner, and the graphite chill core body 2 is wrapped after the molten metal enters the cavity. And after the casting is cooled and solidified, opening the box and shakeout, and cleaning a casting head, burrs and flashes to obtain the partially-coated structure composite graphite chill.

Example 3, shown in fig. 6-7, the composite graphite chiller of the special-shaped full-clad structure

The graphite chiller core body 2 of the embodiment is in a cuboid shape or an equal-thickness arc shape, the metal chiller is in an equal-thickness arc plate shape similar to the graphite chiller core body 2, and the metal chiller 1 is completely coated outside the graphite chiller core body 2.

The graphite can be cut into the required shape and size by commercial or self-made graphite blocks; and also from the leftovers of various carbon plants and the waste graphite electrodes of various steel plants. Because the processing performance of the graphite electrode is particularly good, the graphite electrode can be directly processed into graphite with a required shape by a saw, a planer, a lathe and the like; and (3) when the graphite cold iron core is manufactured, water is adopted for flushing and dust reduction, and after the processing is finished, the graphite is dried at the temperature of 150-200 ℃ to constant weight.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The composite graphite chiller is characterized by comprising a graphite chiller core body (2) and a metal chiller (1), wherein the graphite chiller core body (2) is positioned inside the metal chiller (1), the metal chiller (1) is coated outside the graphite chiller core body (2), the graphite chiller core body (2) is cuboid, a plurality of convex ridges (3) are arranged on the upper surface and the lower surface of the graphite chiller core body (2), and the upper surface of the convex ridges (3) on the upper surface and the lower surface of the graphite chiller core body (2) are exposed out of the outer surface of the metal chiller (1) and are flush with the outer surface of the metal chiller (1); or the graphite chiller core body (2) is cuboid, the metal chiller (1) is in an equal-thickness arc plate shape, and the metal chiller (1) is completely wrapped outside the graphite chiller core body (2).

2. The composite graphite chiller according to claim 1, characterized in that the metal chiller (1) is any one or more of cast iron, cast steel and cast aluminum alloy metal.