CN1301814C - Hollow ball plug and manufacturing method thereof - Google Patents

Abstract

The hollow ball plug is a hollow ball plug, molten metal is poured into a clamping type mould which is in high-speed rotation and consists of an upper part and a lower part, a mould cavity in the shape of the manufactured ball plug and a sand core in accordance with the hollow shape of the ball plug are preset in the mould, the sand core is provided with a central channel, the molten metal is poured from the central channel and is uniformly distributed in a gap between the mould cavity and the sand core through a flow channel at the bottom of the sand core, and after the molten metal is cooled, the mould stops rotating, demoulding is carried out, and the sand core is smashed, so that the ball plug is manufactured. The invention can effectively simplify the process of the thin-wall ball plug and provide better quality of the ball plug.

Description

Hollow ball plug and manufacturing method thereof

technical field

The invention relates to a ball plug and its casting method, in particular to a hollow ball plug and its manufacturing method.

Background technique

Generally, the ball plug manufactured by the known centrifugal casting method is to pour the melted molten metal into a clamping mold consisting of upper and lower parts in high-speed rotation. There is a mold cavity in the shape of a ball plug in the mold. After cooling, the mold stops rotating, and demoulding is performed to obtain a ball plug. However, although the center of the ball plug has a cylindrical through hole, the parts other than the through hole of the ball plug are solid, and the required metal material The quantity is large, so the cost is high, and because the inside of the ball plug is thick and solid, the overall weight is heavy, it is difficult to carry, and the carrying capacity is quite limited. When it is installed in the valve body, the rotation flexibility is not good, which needs to be improved. Another announcement number is: 457347, and the name is: patent of hollow ball plug and its manufacturing method. It is provided with an hourglass-shaped upper mold cavity in the upper mold, so that the top of the sand core can penetrate the upper mold. On the top of the mold, the upper and lower parts of the sand core are tightly embedded with the upper and lower molds without leaving any gaps, and shaping sand is required to make the sand core form a suspended shape, and then cooperate with the lower mold cavity of the lower mold to correspond to the sand core, and match with the upper mold Close together to form a preformed ball plug cavity between the upper and lower molds and the sand core, and cooperate with the centrifugal casting method to cast a hollow ball plug, so that this process can greatly reduce the cost of manufacturing the ball plug Material cost, reduce the weight of the ball plug and facilitate handling.

But, this bulletin number is: 457347, and the name is: the patent of hollow type ball plug and its manufacturing method, still there are many difficulties in the actual process implementation: because the top of the sand core passes through the upper mold hole hourglass of the upper mold The shaped part must be filled and fixed with shaping sand, so that the sand core can form a suspended shape and be fixed in the upper mold cavity of the upper mold. After the completion, it is necessary to support the sand core from the bottom of the sand core with the aid of measuring tools, and then fill it with shaping sand and fix it. Although the shaping sand has the effect of fast fixing, it is a false fixing, not very firm, nor can it be fixed. It can be quickly fixed within a few seconds, and it must wait until it is completely dry before the false fixation effect occurs; and because the sand core is an object with gravity, it is under the action of high-speed rotation and centrifugation, and the false fixation is not secure Under the circumstances, the sand core often has sagging and eccentricity, which causes the gap between the sand core and the lower and upper mold cavities to be inconsistent, so that the internal thickness of the ball plug cannot be controlled during rotational molding, and the manufactured ball plug , of course there are great differences in thickness, making the quality quite unstable.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a hollow ball plug and its manufacturing method, which can overcome the disadvantages of heavy weight, high cost, large thickness difference and unstable quality of the hollow ball plug manufactured by the existing technology.

The purpose of the present invention is achieved in this way: a method for manufacturing a hollow ball plug, which is to pour molten molten metal into a clamping mold consisting of upper and lower parts in high-speed rotation. A mold cavity in the shape of a ball plug, and a sand core consistent with the hollow shape of the ball plug. The lower half of the sand core is placed in the lower mold cavity of the lower mold. The bottom of the sand core is the lower core head and the lower mold cavity. The top of the sand core That is, the upper core head is in contact with the upper mold cavity, and the sand core has a central channel, and the molten metal is poured from the central channel, and passes through the flow channel in the lower core head that communicates with the gap formed by the mold and the sand core, so that The molten metal evenly spreads in the gap between the mold cavity and the sand core, and after it cools down, the mold stops rotating, then the mold is demoulded, and the sand core is crushed to obtain the ball plug.

A method for manufacturing a hollow ball plug, which is to pour molten metal into a high-speed rotating clamping mold consisting of upper and lower parts, the mold is preset with a mold cavity in the shape of the ball plug to be manufactured, and The sand core is consistent with the hollow shape of the ball plug. The sand core has a central channel, and the molten metal is poured from the central channel, and passes through the flow channel at the bottom of the sand core, so that the molten metal is evenly distributed in the mold cavity and In the gap between the sand cores, wait for them to cool down, stop the rotation of the mold, demould again, and crush the sand cores to produce ball plugs, which completely solves the above-mentioned defects in the prior art.

The manufacturing process specifically includes the following steps:

Material preparation: heating the metal material until it melts into a liquid state;

Fixing the lower mold: the lower mold whose mold cavity is the shape of the lower half of the ball plug is preset, and the lower mold is locked and fixed in the centrifugal casting machine;

Place the sand core: place the lower half of the sand core in the lower mold cavity of the lower mold so that the lower core head is in contact with the lower mold cavity, and maintain a preset distance between the rest of the lower half of the sand core and the lower mold cavity. Gap, which determines the thickness of the inside of the molded ball plug;

Cover the upper mold: the upper mold whose mold cavity is the shape of the upper half of the ball plug is preset. The upper mold cavity of the upper mold faces the sand core and is covered on the lower mold, so that the upper half of the sand core is placed on the upper mold. In the upper mold cavity, the upper core head is in contact with the upper mold cavity, and there is a preset gap between the rest of the upper part of the sand core and the upper mold cavity. The gap determines the thickness of the ball plug to be formed. While the mold is locked and clamped, the sand core can be clamped in the lower and upper mold cavities, and then the centrifugal casting casing can be covered;

Start the centrifugal casting machine: Start the centrifugal casting machine fixed with clamping lower and upper molds to make the mold rotate at high speed;

Pouring: pour a pre-calculated appropriate amount of molten metal from the sprue above the centrifugal casting machine into the central channel of the sand core placed in the lower and upper mold cavities of the clip-type lower and upper molds rotating at high speed;

Rotary centrifugal molding: Due to the centrifugal force generated by the high-speed rotation of the clamping lower and upper molds, the molten metal is evenly distributed in the gap between the lower and upper mold cavities and the sand core;

Complete the ball plug casting: After the rotary centrifugal molding process, the molten metal is cooled for a period of time, and the ball plug in the gap between the sand core and the lower and upper mold cavities is formed;

Open the upper mold: stop the rotation of the centrifugal casting machine, open the casing box and the upper mold of the centrifugal casting;

Take out the casting: take out the ball plug with the sand core;

Crush the sand core: crush the sand core to get the ball plug.

The present invention also provides a hollow ball plug manufactured according to the above manufacturing method.

The present invention has the following advantages:

It can manufacture thin-walled hollow ball plugs with a well-designed and simplified process, which not only reduces weight, greatly reduces materials, reduces costs, but also makes the ball plug material more precise and of better quality.

Description of drawings

Fig. 1 is casting method flowchart of the present invention;

Fig. 2 is an exploded perspective view of upper and lower molds and sand cores of the present invention;

Fig. 3 is the combination plane sectional view of upper and lower mold, sand core and centrifugal casting machine of the present invention;

Fig. 4 is sand core of the present invention and casting plane sectional view;

Fig. 5 is a plane sectional view of a casting of the present invention;

Fig. 6 is a schematic diagram of the structure between the shell box and the centrifugal casting machine of the present invention.

Explanation of reference numerals: 10 lower mold; 12 upper mold; 14 sand core; 16 ball plug; 18 centrifugal casting machine; 20 lower mold cavity; 22 upper mold cavity; 24 shell box; Road; 40 base; 42 main shaft; 44 motor; 46 cover; 48 centrifugal turntable.

Detailed ways

In order to have a more detailed and definite understanding of the technology and means on the object and method of the present invention, a preferred specific embodiment of the present invention is cited and described as follows in conjunction with the drawings:

Please refer to shown in Fig. 1, it is a kind of asymmetric type vertical centrifugal casting method flow chart of the present invention, and cooperate to refer to shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, Fig. 6, its whole manufacturing process includes the following Steps:

Material preparation: heating the metal material until it melts into a liquid state;

Fix the lower mold: the lower mold cavity 20 is preset as the lower mold 10 in the shape of the lower half of the ball plug, and the lower mold 10 is locked and fixed in the centrifugal casting machine 18;

Place the sand core: the sand core 14 whose shape is the hollow shape of the ball plug and has a central channel is preset. The lower half of the sand core 14 is placed in the lower mold cavity 20 of the lower mold 10. There is a preset gap between the cavities 20, which determines the thickness of the inside of the formed ball plug 16;

Cover the upper mold: the upper mold 12 with the shape of the upper half of the upper mold cavity 22 ball plug is preset, the upper mold cavity 22 of the upper mold 12 faces the sand core 14, and is covered on the lower mold 10, and the upper half of the sand core 14 It is accommodated in the upper mold cavity 22 of the upper mold 12, and also maintains a preset gap between the sand core 14 and the upper mold cavity 22. The gap determines the thickness of the inside of the formed ball plug 16. The two lower and upper molds While locking and clamping 10 and 12, the sand core 14 can be clamped in the lower and upper mold cavities 20 and 22, and then the shell box 24 of the centrifugal casting machine 18 is covered; the centrifugal casting machine is started: the solid Start the centrifugal casting machine 18 equipped with the lower and upper molds 10 and 12 of the clamping type to rotate at high speed;

Pouring: The pre-calculated appropriate amount of molten metal is poured from the sprue 26 above the centrifugal casting machine 18 into the lower and upper mold cavities 20, 22 of the two clamping lower and upper molds 10, 12 rotating at high speed The central channel 28 of the placed sand core 14;

The top of the sand core is tightly embedded and fixed at the pouring port of the upper mold;

The shell box 24 is provided with a cover 46 that can be opened; the cover 46 is dug with a pouring bucket; the shell box 24 is provided with a centrifugal turntable 48; the molds 10, 12 are fixed on the centrifugal On the turntable, the centrifugal turntable and the mold are driven to rotate by the motor 44 and the main shaft to generate centrifugal force.

Rotary centrifugal molding: due to the centrifugal force generated by the high-speed rotation of the two clamped lower and upper molds 10 and 12, using its principle, the molten metal passes through the flow channel 30 at the bottom of the sand core 14 in the central channel 28 of the sand core 14, allowing The molten metal flows evenly in the gap between the lower and upper mold cavities 20, 22 and the sand core 14;

Complete the ball plug casting: the rotary centrifugal molding process, after cooling the molten metal for a period of time, the gap between the sand core 14 and the lower and upper mold cavities 20, 22 is formed with a ball plug 16;

Open the upper mold: stop the rotation of the centrifugal casting machine 18, open the shell box 24 and the upper mold 12 of the centrifugal casting machine 18;

Take out the casting: take out the formed ball plug 16 and sand core 14;

Crushing the sand core: Since the completed ball plug 16 is made of metal material with high hardness, the sand core 14 is crushed to obtain the ball plug 16;

The above-mentioned scheme can effectively solve the shortcoming of the patent whose announcement number is: 457347, and the name is: hollow ball plug and its manufacturing method, and has the following advantages:

In the manufacturing process of the present invention, the sand core can be directly placed in the lower mold cavity of the lower mold, and then the upper mold cavity of the upper mold is facing the sand core, covered on the lower mold, and the upper and lower molds are locked and clamped at the same time , the sand core can be clamped in the upper and lower mold cavities, without any instrument to correct the gap, and without the assistance of special tools and the fixing of the shaping sand, to achieve fast fixing action, due to the lower and upper mold cavities and the sand The shape of the core and its clearance are pre-set, and the sand core is quickly and firmly fixed, even under the action of high-speed rotating centrifugation, the sand core will never shift, and the gap between the sand core and the lower and upper mold cavities will be maintained. Consistency, so that the inside of the ball plug is formed with the proper thickness during rotational molding, and the quality of the manufactured ball plug is quite stable.

Claims (3)

1. A method for manufacturing a hollow ball plug, which is to pour molten metal into a high-speed rotating clamping mold consisting of upper and lower parts. The mold is preset with a mold cavity in the shape of the ball plug. And the sand core with the same hollow shape as the ball plug, the lower half of the sand core is placed in the lower mold cavity of the lower mold, the bottom of the sand core is the lower core head and the lower mold cavity, and the top of the sand core is the upper core head and the upper mold. The sand core has a central channel, and the molten metal is poured into the central channel, and passes through the flow channel in the lower core head that communicates with the gap formed by the mold and the sand core, so that the molten metal can be evenly distributed in the mold. In the gap between the hole and the sand core, wait for it to cool, stop the mold from rotating, demould again, and crush the sand core to obtain the ball plug. 2. A method for manufacturing a hollow ball plug as claimed in claim 1, wherein the manufacturing process includes: Material preparation: heating the metal material until it melts into a liquid state; Fixing the lower mold: the lower mold whose mold cavity is the shape of the lower half of the ball plug is preset, and the lower mold is locked and fixed in the centrifugal casting machine; Place the sand core: place the lower half of the sand core in the lower mold cavity of the lower mold so that the lower core head is in contact with the lower mold cavity, and maintain a preset distance between the rest of the lower half of the sand core and the lower mold cavity. Gap, which determines the thickness of the inside of the molded ball plug; Cover the upper mold: the upper mold whose mold cavity is the shape of the upper half of the ball plug is preset. The upper mold cavity of the upper mold faces the sand core and is covered on the lower mold, so that the upper half of the sand core is placed on the upper mold. In the upper mold cavity, the upper core head is in contact with the upper mold cavity, and there is a preset gap between the rest of the upper part of the sand core and the upper mold cavity. The gap determines the thickness of the ball plug to be formed. While the mold is locked and clamped, the sand core can be clamped in the lower and upper mold cavities, and then the centrifugal casting casing can be covered; Start the centrifugal casting machine: Start the centrifugal casting machine fixed with clamping lower and upper molds to make the mold rotate at high speed; Pouring: pour a pre-calculated appropriate amount of molten metal from the sprue above the centrifugal casting machine into the central channel of the sand core placed in the lower and upper mold cavities of the clip-type lower and upper molds rotating at high speed; Rotary centrifugal molding: Due to the centrifugal force generated by the high-speed rotation of the clamping lower and upper molds, the molten metal is evenly distributed in the gap between the lower and upper mold cavities and the sand core; Complete the ball plug casting: After the rotary centrifugal molding process, the molten metal is cooled for a period of time, and the ball plug in the gap between the sand core and the lower and upper mold cavities is formed; Open the upper mold: stop the rotation of the centrifugal casting machine, open the casing box and the upper mold of the centrifugal casting; Take out the casting: take out the ball plug with the sand core; Crush the sand core: crush the sand core to get the ball plug. 3. Hollow ball plug manufactured by the method according to claim 1 or 2.

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