KR20190066944A - Manufacturing method of forged ball for ball valve - Google Patents

Abstract

The present invention relates to a manufacturing method of a forged ball for a large ball valve. According to an embodiment of the present invention, the manufacturing method of the forged ball for the large ball valve comprises: a step of providing raw materials whose cross-section is in a shape of a rectangle; a step of cogging the raw materials to manufacture a first processed product whose cross-section is in a circular shape; a step of performing an upset forging on the first processed product to manufacture a second processed product; a step of piercing the second processed product to manufacture a third processed product with a hollow part inside; a step of inserting a pipe bar into the hollow part of the third processed product to use an upper die and a lower die, to process an outer circumferential surface of the third processed product into a shape of a ball, and to manufacture a fourth processed product; and a step of removing the lower die to apply a downward pressure to the upper die, and to manufacture a fifth processed product. The present invention aims to provide a manufacturing method for a forged ball for a large ball valve, which is able to mass-produce various sizes and types of large forged balls by using an existing facility without a separate investment in large facilities.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a forged ball for a large ball valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball manufacturing method applied to a ball valve, and more particularly, to a method of manufacturing a forged ball applied to a large ball valve.

BACKGROUND OF THE INVENTION [0002] A valve is generally an apparatus for regulating or blocking the flow of fluid, and is one of the important components used throughout various industries.

These valves are variously configured according to the application area and operation method. In particular, industrial ball valves are inevitably subject to a small quantity production method depending on the products to which they are applied, and as a result, The proportion is very large.

On the other hand, small balls for ball valves manufactured and consumed domestically are generally manufactured by casting, but in the case of large balls, the production cost of the casting process is very high, the mechanical properties are low and the reliability is low, .

However, due to the recent trend of large-scale plant industry, plant element parts such as ball ball ball are also becoming larger and larger, which can lead to lower cost competitiveness due to capital investment, depreciation and facility area. .

On the other hand, the following prior art documents disclose a hollow shape in which a through hole is formed parallel to the upper and lower surfaces or left and right sides, and a lever coupling hole is formed on one surface in a direction perpendicular to the through hole; And a tube body coupled to the through-hole of the spherical body to form a flow path inside the spherical body, and a method of manufacturing the ball unit, and does not disclose the technical gist of the present invention.

Korean Patent Publication No. 10-2015-0117407

The method for manufacturing a ball for a ball valve according to the present invention has the following problems in order to solve the above-mentioned problems.

The present invention proposes a method for manufacturing a large-sized ball valve forged ball which can mass-produce large-sized forged balls of various sizes and types by using existing facilities without investing in a large-sized facility.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

A method of manufacturing a forged ball for a large ball valve according to an embodiment of the present invention includes: providing a raw material having a rectangular cross section; Cogging the raw material to produce a first processed product having a circular cross section; An upset forging step of upset forging the first workpiece to produce a second workpiece; Piercing the second workpiece to produce a third workpiece having a hollow therein; A semi-die forging step of inserting a pipe bar into the hollow of the third workpiece and machining the outer circumferential surface of the third workpiece into a ball shape using the upper die and the lower die to produce a fourth workpiece; And removing the lower die and applying a downward pressure to the upper die to produce a fifth workpiece.

Said semi-die forging step comprising the steps of: inserting a pipe bar into the hollow of said third workpiece; Disposing the upper die and the lower die on one side and the other side of the outer circumferential surface of the third workpiece, respectively; And pressing the upper die and the lower die toward the pipe bar while rotating the pipe bar.

Wherein the step of forging comprises: removing the lower die; And pressing the upper die toward the pipe bar while rotating the pipe bar.

And performing at least one of roughing and finishing the outer surface of the fifth workpiece after the step of engraving forging.

According to another aspect of the present invention, there is provided a method of manufacturing a forged ball for a large ball valve, the method comprising: providing a raw material having a circular section; Upset forging and piercing processing for upsetting and piercing the raw material to produce a primary workpiece having a hollow therein; A semi-die forging step of inserting a pipe bar into the hollow of the primary workpiece and machining the outer peripheral surface of the primary workpiece into a ball shape using an upper die and a lower die to produce a secondary workpiece; And removing the lower die and applying a downward pressure to the upper die to produce a third finished product.

Said semi-die forging step comprising the steps of: inserting a pipe bar into the hollow of said primary workpiece; Disposing the upper die and the lower die on one side and the other side of the outer circumferential surface of the primary workpiece, respectively; And pressing the upper die and the lower die toward the pipe bar while rotating the pipe bar.

Wherein the step of forging comprises: removing the lower die; And pressing the upper die toward the pipe bar while rotating the pipe bar.

And performing at least one of roughing and finishing the outer surface of the third workpiece after the inlining forging step.

The method of manufacturing a forged ball for a large ball valve according to one embodiment of the present invention and another embodiment provides a forging method by combining a semi-die forging process and an inlaid forging process, thereby manufacturing a large forged ball without additional facility investment There is an advantage to be able to do.

In addition, since it is easy to control the product dimensions such as the outer diameter, the inner diameter and the thickness, the machining allowance can be reduced, and the effect of reducing the raw material can be expected.

In addition, since the number of processes can be reduced compared to the existing forged ball manufacturing process, the manufacturing cost can be reduced.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the following description.

FIG. 1 is a flowchart showing a conventional method for manufacturing a large-sized ball valve forged ball in a time-wise manner.
Fig. 2 is a view showing an actual embodiment of each step of Fig. 1. Fig.
FIG. 3 is a flowchart illustrating a method for manufacturing a ball for forging ball valve according to an embodiment of the present invention in a time-wise manner.
FIG. 4 is a view showing an actual implementation example of each step of FIG. 3. FIG.
5 is a flowchart detailing the semi-die forging process of FIG. 3 in detail.
FIG. 6 is a flow chart embodying the in-lasing forging process of FIG. 3 in detail.
7 is a flowchart illustrating a method for manufacturing a ball valve forged ball according to another embodiment of the present invention in a time-wise manner.
FIG. 8 is a view showing an actual implementation example of each step of FIG. 7. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 and 2, a method for manufacturing a large-sized ball valve forged ball according to an embodiment of the present invention will be described with reference to FIGS. Explain it.

FIG. 1 is a flowchart showing a conventional method for manufacturing a forged ball for a large ball valve in a time-series manner, and FIG. 2 is a view showing an actual implementation example of each step in FIG.

1 and 2, a conventional method for manufacturing a large-sized ball valve forging ball includes steps of providing a raw material (S10), a cogging process S20, an upset forging process S30, a piercing process S40 , A ring rolling step (S50), a roughing step (S60) and a finishing step (S70).

The raw material supply step S10 is a step of providing a slab whose section is cut into a rectangle.

Thereafter, the slab, which is a raw material, is subjected to a cogging processing step (S20) in which the slab is heated to a sufficient temperature and then the corner portion is pressure-molded into a cylindrical shape.

Specifically, in the cogging process, the slab is rotated in a predetermined direction at a predetermined rpm in one direction, and repeatedly press-molded in a vertical direction to form a semi-finished product having a rectangular or rectangular shape in cross section.

The cross-sectional area of the upper and lower surfaces of the semi-finished product is enlarged through an upset forging process (S30) in which the cross-sectional area is expanded by pressing the upper and lower directions by the cogging process step S20. .

The semi-finished product that has undergone the above-described cogging process (S20) and the upset forging process (S30) is subjected to a piercing processing step (S40) for forming an inner diameter portion having a predetermined diameter in the central axial direction.

Thereafter, a ring rolling step (S50) is performed to press-mold the semi-finished product that has been pierced by using the main roll and the mandrel. Finally, the roughing step (S60) and the finishing step (S70), the forging ball for a large ball valve is completed.

This conventional method of manufacturing a forged ball for a large ball valve has a problem in that it is required to newly construct a facility for carrying out a ring rolling step (S50) when it is required to manufacture a forged ball for an extra large ball valve required by a customer.

Furthermore, since the conventional manufacturing method of a forged ball for a large ball valve is difficult to control the product dimensions such as the outer diameter, the inner diameter and the thickness, sufficient working margin must be provided in the production of the product, and thus there is a problem that the raw material is wasted more than necessary.

Hereinafter, a method for manufacturing a forged ball for a large ball valve according to an embodiment of the present invention will be described with reference to FIGS. 3 to 6. FIG.

FIG. 3 is a flow chart illustrating a method for manufacturing a ball for forging ball valve according to an embodiment of the present invention in a time-series manner, FIG. 4 is a view showing an actual implementation example of each step in FIG. 3, 3 is a flow chart embodying the semi-die forging step in detail, and FIG. 6 is a flow chart embodying the in-lasing forging step of FIG. 3 in detail.

3 and 4, the method for manufacturing a large-sized ball valve forging ball valve according to an embodiment of the present invention includes a raw material providing step S110, a cogging processing step S120, an upset forging processing step S130, A piercing step S140, a semi-die forging step S150, an enlarging forging step S160, and a finishing step S170.

The raw material providing step S110 is a step of providing the raw material 110 which is a slab whose cross section is formed in a rectangular shape or a long direction.

The cogging processing step S120 includes the steps of rotating the raw material 110 in a predetermined direction in a predetermined direction and repeatedly pressing the raw material 110 in the upward and downward directions to form a raw material 110 having a rectangular or rectangular cross section, 120).

After the cogging step S120, an upset forging step S130 is performed. The first workpiece 120, which is the product of the cogging work step S120, is upset forged to manufacture the second workpiece 130 .

The first workpiece 120 having undergone the cogging machining step S120 is further subjected to an upset forging step S130 for expanding the cross sectional area by pressing and forming the upper and lower directions again so that the cross sectional area of the upper and lower surfaces is enlarged, A second workpiece 130 having a curved surface shape is produced.

Thereafter, a piercing processing step (S140) for manufacturing a third processed product 140 in which a hollow 141 is formed is performed by performing a piercing process for forming an inner diameter portion having a predetermined diameter in the second processed product 130 do.

After the piercing step S140, a semi-die forging step S150 is performed. In this semi-die forging step S150, the pipe bar 151 is inserted into the third work 140 A process of manufacturing the fourth workpiece 150 by inserting the third die 140 into the hollow 141 and machining the outer circumferential surface of the third workpiece 140 into a ball shape using the upper die 152 and the lower die 153 is performed.

This semi-die forging step S150 can be subdivided into three process steps as shown in Fig. 5 in detail.

This semi-die forging step S150 includes first a step (S151) of inserting the pipe bar 151 into the hollow 141 of the third workpiece 140 and a step (S151) of cutting the upper die 152 and the lower die 153 A step S152 of placing the upper die 152 and the lower die 153 in the direction of the pipe bar 151 while rotating the pipe bar 151 It is specified in step S153.

By this semi-die forging process S150, the outer circumferential surface of the third workpiece 140 is processed into a curved surface having a predetermined curvature so as to be formed into a ball shape, so that the fourth workpiece 150 is manufactured.

Thereafter, an Enlarging forging step S160 for increasing the inner diameter of the fourth workpiece 150 is performed.

This phosphorus forging step S160 is performed by removing the lower die 153 of the pipe bar 151, the upper die 152 and the lower die 153 used in the semi-die forging step S150, And then applying a downward pressure to the second workpiece 152 to manufacture the fifth workpiece 160. Specifically, as shown in FIG. 6, the workpiece 160 can be roughly divided into two steps.

That is, the step of engraving forging (S160) includes a step (S161) of removing the lower die 153 and a step (S162) of pressing the upper die 152 toward the pipe bar 151 while rotating the pipe bar 151 ), And since the product dimension can be easily controlled by such an inlaid forging process, it is possible to reduce the machining allowance at the time of manufacturing the product, and the effect of reducing the raw material can be expected.

Finally, the step (S170) of performing at least one of roughing and finishing the outer surface of the fifth workpiece 160 may be performed, thereby making it possible to manufacture the final large-sized ball valve forging ball.

Hereinafter, a method of manufacturing a forged ball for a large ball valve according to another embodiment of the present invention will be described with reference to FIGS. 7 and 8, In the description, duplicate descriptions should be omitted.

FIG. 7 is a flow chart illustrating a method for manufacturing a ball for forging ball valve according to another embodiment of the present invention in a time-series manner, and FIG. 8 is a view showing an actual implementation example of each step in FIG.

7 and 8, the method for manufacturing a large-sized ball valve for a ball valve according to another embodiment of the present invention may include providing raw material (S210), upset forging and piercing (S220), semi-die forging A machining step S230, an engraving forging step S240, and a finishing step S250.

The raw material providing step S210 is a step of providing a raw material 200 having a round cross section, that is, a round bloom. When the round bloom 200 is provided, the cogging processing step can be eliminated, The process cost can be reduced.

Then, an upset forging and piercing processing step (S220) is performed in which the raw material 200, i.e., the round bloom 200, is simultaneously subjected to upset forging and piercing.

The upset forging and piercing processing step S220 can reduce the number of processes by pressing the round bloom 200 in the vertical direction to enlarge the cross-sectional area and forming the hollow 221 inside.

Thereafter, a semi-die forging step S230 for manufacturing the secondary workpiece 230 by machining the outer circumferential surface of the primary workpiece 220 calculated by the upset forging and piercing processing step S220 into a ball shape is performed do.

This semi-die forging step S230 is specifically performed by inserting the pipe bar 231 into the hollow 221 of the primary workpiece 220 and by using the upper die 232 and the lower die 233, The process of manufacturing the secondary workpiece 230 by machining the outer circumferential surface of the workpiece 220 into a ball shape is explained in detail with reference to the contents described in the step of the semi-die forging (S150) according to an embodiment of the present invention Therefore, a detailed description thereof will be omitted.

After the semi-die forging step S230, an engraving forging step S240 is performed in which the lower die 233 is removed and a downward pressure is applied to the upper die 232 to manufacture the third workpiece 240 And a detailed description thereof is also the same as that described in the step of engraving forging (S160) according to an embodiment of the present invention, so that a detailed description thereof will be omitted.

Finally, a finishing process (S250) may be performed on the outer surface of the third processed product 240, thereby manufacturing a final forged ball for a large ball valve.

According to another embodiment of the present invention, there is provided a method of manufacturing a forged ball for a large ball valve, which can reduce a machining allowance in manufacturing a product, It is possible not only to have the advantages of the method of manufacturing a ball for forging ball valve but also to reduce the process cost by reducing the number of process steps.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

Claims (5)

Providing a raw material having a rectangular cross section;
Cogging the raw material to produce a first processed product having a circular cross section;
An upset forging step of upset forging the first workpiece to produce a second workpiece;
Piercing the second workpiece to produce a third workpiece having a hollow therein;
A semi-die forging step of inserting a pipe bar into the hollow of the third workpiece and machining the outer circumferential surface of the third workpiece into a ball shape using the upper die and the lower die to produce a fourth workpiece;
Removing the lower die and applying a downward pressure to the upper die to produce a fifth workpiece;
Wherein the method comprises the steps of:
The method of claim 1, wherein the semi-die forging comprises:
Inserting a pipe bar into the hollow of said third workpiece;
Disposing the upper die and the lower die on one side and the other side of the outer circumferential surface of the third workpiece, respectively; And
Pressing the upper die and the lower die toward the pipe bar while rotating the pipe bar;
Wherein the method comprises the steps of:
The method according to claim 1,
Removing the lower die; And
Pressing the upper die toward the pipe bar while rotating the pipe bar;
Wherein the method comprises the steps of:
The method according to claim 1, wherein after the step of forging,
Performing at least one of roughing and finishing the outer surface of the fifth workpiece;
Further comprising the steps of:
Providing a raw material having a circular cross section;
Upset forging and piercing processing for upsetting and piercing the raw material to produce a primary workpiece having a hollow therein;
A semi-die forging step of inserting a pipe bar into the hollow of the primary workpiece and machining the outer peripheral surface of the primary workpiece into a ball shape using an upper die and a lower die to produce a secondary workpiece;
Removing the lower die and applying a downward pressure to the upper die to produce a third processed product;
Wherein the method comprises the steps of:

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