CN1190283C - Hollow ball plug manufacturing method - Google Patents

Abstract

A method for manufacturing a hollow ball plug. In order to provide a manufacturing method of a ball plug with compact material, fine quality, reduced material cost and lightened weight, the invention provides a manufacturing method of the ball plug, which comprises a lower die and an upper die which are prepared to form a lower hemispherical die cavity and an upper die cavity in an hourglass shape; the upper die cavity consists of an upper hemispherical die cavity, a necking part and a funnel part; placing a sand core provided with an axial pouring gate, fixing the sand core, starting a centrifugal casting machine, quantitatively casting molten metal, rotationally forming, finishing a hollow ball plug, taking out an upper die, smashing the sand core and taking out the smashed sand core; the bottom side of the sand core is a sphere with a cylindrical part and a connecting part arranged at the top.

Description

Hollow ball plug manufacturing method

technical field

The invention belongs to a method for manufacturing a ball plug, in particular to a method for manufacturing a hollow ball plug.

Background technique

With the advancement of science and technology, how to effectively reduce costs and improve quality in the manufacturing process is the goal of the general industry. The generally known centrifugal casting ball plug and its manufacturing method are to directly close the upper and lower molds, and pour the molten metal through the gate, so as to use the centrifugal casting machine to form the centrifugal force generated by high-speed rotation, thereby The upper and lower molds are molded into ball plugs. But the ball plug that this kind of method manufactures has cylindrical through hole in the middle of the ball plug, but all is solid in its ball plug except the position of through hole.

There are at least the following disadvantages in the use and implementation of conventional ball plugs:

Because the inside of the ball plug is solid, not only the required amount of molten metal is large, but the manufacturing cost is also high, and because the ball plug is solid, the overall weight is heavy and it is not easy to carry; when it is installed in the valve body, the rotation is flexible Sex is not good either.

Contents of the invention

The object of the present invention is to provide a hollow ball plug manufacturing method with compact material, excellent quality, lower material cost and weight of the ball plug.

The present invention comprises the following steps:

step one

Prepare the mold:

Place the required lower mold in the centrifugal casting machine, and form a lower hemispheric cavity corresponding to the lower hemisphere of the hollow ball plug in the lower mold; an upper mold is provided corresponding to the lower mold, and a An hourglass-shaped upper mold cavity, the upper mold cavity is composed of an upper hemispheric mold cavity whose bottom corresponds to the upper hemisphere of the hollow ball plug, a necked part in the middle, and a funnel with a tapered hole at the top;

step two

Place sand core:

Set the top of the sand core in the upper mold cavity of the upper mold; the sand core is axially penetrated with a sprue, and its bottom side is a sphere corresponding to the upper and lower hemispherical mold cavities of the upper mold and the lower mold, and the sand core A gap corresponding to the hollow ball plug is formed between the sphere and the upper and lower hemispherical mold cavities. The sand core is provided with a cylindrical part corresponding to the hole of the hollow ball plug on the top of the sphere, and a hole is provided on the top of the cylindrical part. The connecting part of the necking part of the upper mold;

step three

Fixed sand core:

Pass the connecting part of the sand core through the necking part of the upper mold to the funnel, and fill the space between the connecting part and the funnel with fast-fixed shaping sand to fix and suspend the sand core on the upper mold, and then place the fixed sand The upper mold of the core is fixed corresponding to the lower mold;

step four

Start the centrifugal casting machine:

Start the centrifugal casting machine equipped with upper and lower molds, and rotate the upper and lower molds in conjunction;

step five

Quantitative casting of molten metal:

While the upper and lower molds are rotating with the centrifugal casting machine, pour molten metal into the runner of the upper mold corresponding to the sand core, and control the flow of molten metal;

step six

Rotational molding:

The rotating upper and lower molds make the molten metal flow evenly along the sand core sprue between the upper and lower hemispherical mold cavities of the upper and lower molds and the sand core sphere;

step seven

To complete the hollow ball plug:

During the rotary molding process of the upper and lower molds in the centrifugal casting machine, the molten metal can be cooled in a normal time and then formed into a hollow ball plug;

step eight

Take out the upper mold:

Stop the centrifugal casting machine, and separate the upper mold from the lower mold, and then take out the formed hollow ball plug and sand core;

Step Nine

Crushed sand core:

First crush the molding sand in the funnel of the upper mold, take out the hollow ball plug covering the sand core, and crush the sand core;

step ten

Remove the broken sand core:

The broken sand core inside the hollow ball plug is drawn out from the upper and lower perforations formed by the corresponding sand core cylindrical part of the hollow ball plug and the bottom side of the runner.

in:

In the second step of placing the sand core, at least one fitting part is provided on the connecting part of the sand core; in the third step of fixing the sand core, the shaping sand is combined with the fitting part.

In the first step of preparing the mold, there is a taper hole between the neck of the upper mold and the cavity of the upper hemisphere; in the second step of placing the sand core, the sand core is provided with a taper hole above the cylindrical part of the upper mold. The corresponding conical part; the peripheral edge of the conical part fits with the tapered hole part of the upper mold.

In the first step of preparing the mold, the necked part of the upper mold is directly connected with the upper hemispheric mold cavity; in the second step of placing the sand core, there is a flat surface directly connected to the connecting part above the cylindrical part of the sand core; the necked part of the upper mold The bottom side of the bottom is directly attached to the flat surface of the sand core.

The fitting part on the connecting part of the sand core is a ring groove that can be filled with shaping sand.

Since the present invention comprises the following steps:

Prepare the mold:

Place the required lower mold in the centrifugal casting machine, and form a lower hemispheric cavity corresponding to the lower hemisphere of the hollow ball plug in the lower mold; an upper mold is provided corresponding to the lower mold, and a An hourglass-shaped upper mold cavity, the upper mold cavity is composed of an upper hemispheric mold cavity whose bottom corresponds to the upper hemisphere of the hollow ball plug, a necked part in the middle, and a funnel with a tapered hole at the top;

Place sand core:

Set the top of the sand core in the upper mold cavity of the upper mold; the sand core is axially penetrated with a sprue, and its bottom side is a sphere corresponding to the upper and lower hemispherical mold cavities of the upper mold and the lower mold, and the sand core A gap corresponding to the hollow ball plug is formed between the sphere and the upper and lower hemispherical mold cavities. The sand core is provided with a cylindrical part corresponding to the hole of the hollow ball plug on the top of the sphere, and a hole is provided on the top of the cylindrical part. The connecting part of the necking part of the upper mold;

Fixed sand core:

Pass the connecting part of the sand core through the necking part of the upper mold to the funnel, and fill the space between the connecting part and the funnel with fast-fixed shaping sand to fix and suspend the sand core on the upper mold, and then place the fixed sand The upper mold of the core is fixed corresponding to the lower mold;

Start the centrifugal casting machine:

Start the centrifugal casting machine equipped with upper and lower molds, and rotate the upper and lower molds in conjunction;

Quantitative casting of molten metal:

While the upper and lower molds are rotating with the centrifugal casting machine, pour molten metal into the runner of the upper mold corresponding to the sand core, and control the flow of molten metal;

Rotational molding:

The rotating upper and lower molds make the molten metal flow evenly along the sand core sprue between the upper and lower hemispherical mold cavities of the upper and lower molds and the sand core sphere;

To complete the hollow ball plug:

During the rotary molding process of the upper and lower molds in the centrifugal casting machine, the molten metal can be cooled in a normal time and then formed into a hollow ball plug;

Take out the upper mold:

Stop the centrifugal casting machine, and separate the upper mold from the lower mold, and then take out the formed hollow ball plug and sand core;

Crushed sand core:

First crush the molding sand in the funnel of the upper mold, take out the hollow ball plug covering the sand core, and crush the sand core;

Remove the broken sand core:

The broken sand core inside the hollow ball plug is drawn out from the upper and lower perforations formed by the corresponding sand core cylindrical part of the hollow ball plug and the bottom side of the runner. The manufacturing method of the hollow ball plug of the present invention can make the ball plug into a hollow ball plug, so that the inside of the ball plug can be formed into a hollow shape, which can greatly reduce the cost of metal materials, and can reduce the weight of the ball plug and facilitate construction. And handling, while increasing the flexibility of use. Not only the material is dense and the quality is excellent, but also the material cost of the ball plug is reduced and the weight of the ball plug is reduced, thereby achieving the purpose of the present invention.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

Fig. 2 is a schematic sectional view of an exploded structure of a mold used in the present invention.

Fig. 3 is a schematic sectional view of the mold structure used in the present invention.

Fig. 4 is a schematic cross-sectional view of the disassembled structure of the mold used in the present invention (the sand core is provided with a fitting part).

Fig. 5 is a schematic sectional view of the structure of the hollow ball plug manufactured by the present invention.

Fig. 6 is a schematic sectional view of the structure of the sand core used in the present invention (the sand core is provided with a straight surface).

Detailed ways

As shown in Figure 1 and Figure 2, the manufacturing method of the hollow ball plug of the present invention comprises the following steps:

step one

Prepare the mold:

The required lower mold 10 is placed in the centrifugal casting machine 50, and a lower hemispherical mold cavity 11 corresponding to the lower hemisphere of the hollow ball plug 41 is formed in the lower mold 10; an upper mold 20 is provided corresponding to the lower mold 10, In addition, an hourglass-shaped upper mold cavity 21 is provided in the upper mold 20. The upper mold cavity 21 is connected in sequence to the upper hemispheric mold cavity 22 of the upper hemisphere of the hollow ball plug 41, the middle neck portion 23, and the necking portion 23 located at the neck. The tapered hole part 24 between the upper part 23 and the upper hemisphere mold cavity 22 and the funnel part 25 with a tapered hole at the top;

step two

Place sand core 30:

Set the top of the sand core 30 in the upper mold cavity 21 of the upper mold 20; the sand core 30 is axially penetrated with a sprue 31, and its bottom side is the upper and lower hemispherical cavity 22 of the upper mold 20 and the lower mold 10 , 11 corresponding spheroid 32, and make the spheroid 32 of sand core 30 and the upper and lower hemispheric die cavities 22,11 form the space corresponding to hollow type ball plug 41, sand core 30 is provided with at the top of spheroid 32 and The cylindrical part 33 corresponding to the perforation 42 of the hollow ball plug 41 and the conical part 34 corresponding to the tapered hole part 24 in the upper mold 20 are provided at the top of the conical part 34 to pass through the constricted part 23 of the upper mold 20. 35, so that the peripheral edge of the conical portion 34 of the sand core 30 can be attached to the conical hole portion 24 of the upper mold 20;

step three

Fixed sand core 30:

As shown in Figure 3, the connecting portion 35 of the sand core 30 is passed through the necking portion 23 of the upper mold 20 to the funnel portion 25, and between the connecting portion 35 and the funnel portion 25 is filled with fast-fixed shaping sand 40, so that the The sand core 30 is fixed and suspended on the upper mold 20, and then the upper mold 20 with the sand core 30 is fixed corresponding to the lower mold 10;

step four

Start centrifugal casting machine 50:

Start the centrifugal casting machine 50 provided with upper and lower molds 20, 10, and rotate the upper and lower molds 20, 10;

step five

Quantitative casting of molten metal:

While the upper and lower molds 20, 10 are rotating with the centrifugal casting machine 50, the molten metal is poured into the runner 31 corresponding to the sand core 30 in the upper mold 20, and the flow rate of the molten metal is controlled;

step six

Rotational molding:

After the upper and lower molds 20, 10 rotate for a period of time, due to the centrifugal force generated by high speed, the molten metal flows evenly along the sand core 30 runner 31 in the upper and lower hemispherical cavities 22, 11 of the upper and lower molds 20, 10 Formed between the sphere 32 of the sand core 30;

step seven

Complete Hollow Ball Plug 41:

During the rotary molding process of the upper and lower molds 20, 10 in the centrifugal casting machine 50, the molten metal can be formed into a hollow ball plug 41 after being cooled in a normal time, and the hollow ball plug 41 corresponds to the conical part of the sand core 30 34 forms upper and lower perforations 42, 42' with the bottom side of runner 31;

step eight

Take out the upper mold 20:

Stop the centrifugal casting machine 50, and separate the upper mold 20 from the lower mold 10, and then take out the formed hollow ball plug 41 and sand core 30;

Step Nine

Crushed sand core 30:

First crush the shaping sand 40 of the funnel portion 25 of the upper mold 20, and take out the hollow ball plug 41 covering the sand core 30, and because the hollow ball plug 41 is made of metal, its hardness is higher than that of the inner sand core 30. In this way, the sand core 30 can be crushed without damaging the hollow ball plug 41;

step ten

Take out the broken sand core 30:

The upper and lower perforations 42, 42' are formed on the hollow ball plug 41 corresponding to the conical part 34 of the sand core 30 and the bottom side of the runner 31, so that the broken sand inside the hollow ball plug 41 is pulled out from the upper and lower perforations 42, 42' Core 30 to complete the hollow ball plug of the present invention.

As shown in Figure 4, in the step 2 of placing the sand core, at least one fitting portion 26 that is a ring groove is provided on the connecting portion 35 of the sand core 30; in the step 3 of fixing the sand core 30, the shaping sand 40 It can be filled in the fitting portion 26 of the sand core 30 , so that the shaping sand 40 and the sand core 30 form a more stable combination state.

As shown in Figure 6, a flat surface 36 is provided above the cylindrical portion 33 of the sand core 30 to directly connect with the connecting portion 35; an hourglass-shaped upper mold cavity is provided in the upper mold, and the upper mold cavity is connected to the corresponding hollow bottom of the upper mold cavity in sequence. The upper hemisphere cavity of the upper hemisphere of the type ball plug, the necking portion in the middle and the funnel portion with a tapered hole at the top are formed; the bottom side of the necking portion is directly bonded to the flat surface 36.

As shown in Figure 5, the hollow ball plug 41 manufactured by the present invention is a spherical ball plug, and its interior is hollow, and the two corresponding ends of the hollow ball plug 41 are respectively provided with upper and lower through holes 42, 42. '.

In summary, the present invention has the following advantages:

Through the present invention, the ball plug can be made into a hollow ball plug, so that the inside of the ball plug can be formed into a hollow shape, which can greatly reduce the cost of metal materials, and can reduce the weight of the ball plug, which is convenient for construction and transportation, and at the same time increases the use time. flexibility.

Claims (5)

1. A method for manufacturing a hollow ball plug, characterized in that it comprises the following steps: step one Prepare the mold: Place the required lower mold in the centrifugal casting machine, and form a lower hemispheric cavity corresponding to the lower hemisphere of the hollow ball plug in the lower mold; an upper mold is provided corresponding to the lower mold, and a An hourglass-shaped upper mold cavity, the upper mold cavity is composed of an upper hemispheric mold cavity whose bottom corresponds to the upper hemisphere of the hollow ball plug, a necked part in the middle, and a funnel with a tapered hole at the top; step two Place sand core: Set the top of the sand core in the upper mold cavity of the upper mold; the sand core is axially penetrated with a sprue, and its bottom side is a sphere corresponding to the upper and lower hemispherical mold cavities of the upper mold and the lower mold, and the sand core A gap corresponding to the hollow ball plug is formed between the sphere and the upper and lower hemispherical mold cavities. The sand core is provided with a cylindrical part corresponding to the hole of the hollow ball plug on the top of the sphere, and a hole is provided on the top of the cylindrical part. The connecting part of the necking part of the upper mold; step three Fixed sand core: Pass the connecting part of the sand core through the necking part of the upper mold to the funnel, and fill the space between the connecting part and the funnel with fast-fixed shaping sand to fix and suspend the sand core on the upper mold, and then place the fixed sand The upper mold of the core is fixed corresponding to the lower mold; step four Start the centrifugal casting machine: Start the centrifugal casting machine equipped with upper and lower molds, and rotate the upper and lower molds in conjunction; step five Quantitative casting of molten metal: While the upper and lower molds are rotating with the centrifugal casting machine, pour molten metal into the runner of the upper mold corresponding to the sand core, and control the flow of molten metal; step six Rotational molding: The rotating upper and lower molds make the molten metal flow evenly along the sand core sprue between the upper and lower hemispherical mold cavities of the upper and lower molds and the sand core sphere; step seven To complete the hollow ball plug: During the rotary molding process of the upper and lower molds in the centrifugal casting machine, the molten metal can be cooled in a normal time and then formed into a hollow ball plug; step eight Take out the upper mold: Stop the centrifugal casting machine, and separate the upper mold from the lower mold, and then take out the formed hollow ball plug and sand core; Step Nine Crushed sand core: First crush the molding sand in the funnel of the upper mold, take out the hollow ball plug covering the sand core, and crush the sand core; step ten Remove the broken sand core: The broken sand core inside the hollow ball plug is drawn out from the upper and lower perforations formed by the corresponding sand core cylindrical part of the hollow ball plug and the bottom side of the runner. 2. The manufacturing method of hollow ball plug according to claim 1, characterized in that in the second step of placing the sand core, at least one fitting part is provided on the connecting part of the sand core; In step three, the molding sand is combined with the fitting part. 3. The manufacturing method of hollow ball plug according to claim 1, characterized in that in the step 1 of preparing the mold, there is a taper hole between the necked part of the upper mold and the mold cavity of the upper hemisphere; In step 2 of the sand core, the sand core is provided with a conical part corresponding to the inner tapered hole of the upper mold above the cylindrical part of the sphere; the periphery of the conical part is attached to the tapered hole of the upper mold. 4. The manufacturing method of the hollow ball plug according to claim 1, characterized in that in the first step of preparing the mold, the necked part of the upper mold directly connects with the upper hemisphere mold cavity; the second step of placing the sand core In the middle, a flat surface directly connected with the connection part is provided above the cylindrical part of the sand core; the bottom side of the necked part of the upper mold is directly attached to the flat surface of the sand core. 5. The manufacturing method of the hollow ball plug according to claim 2, characterized in that the fitting part on the connecting part of the sand core is a ring groove that can be filled with shaping sand.

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