KR101090607B1 - Error adjustable pipe enlarging mold device - Google Patents

Abstract

The present invention relates to an expansion mold used to expand an end portion of a metal tube having a circular cross section, and more particularly, an error correction that can adjust an error occurring during processing of a product without replacing or modifying the mold itself. It is related with the expansion apparatus for expansion.

According to an aspect of the present invention, there is provided an apparatus for expanding a tube for expanding an end portion of a tube, the mold apparatus including a molding groove accommodating an end portion of the tube, the mold portion being divided into a plurality of parts, and each of the divided mold portions formed with respect to the center of the tube. Provided is an expansion mold apparatus capable of error correction, including a mold conveying unit for uniformly moving radially.

Expansion mold

Description

Expansion mold device for error correction {ERROR ADJUSTABLE PIPE ENLARGING MOLD DEVICE}

The present invention relates to an expansion mold used to expand an end portion of a metal tube having a circular cross section, and more particularly, an error correction that can adjust an error occurring during processing of a product without replacing or modifying the mold itself. It is related with the expansion apparatus for expansion.

Various pipe shaped parts are used in automobiles.

In particular, there are parts in which the diameters of both pipe ends are to be formed larger than the central part.

1 is a cross-sectional view of a tube expansion tube showing a structure in which both tube diameters are larger than the central portion.

As shown, the tube end expansion tube 12 has a larger diameter at both ends 14 than the diameter of the central portion 12.

Pipe end expansion tube 12 having such a shape is difficult to form in a continuous tubing method. This is because only a tubular shape having a constant diameter can be manufactured by the continuous tubing method. Of course, in order to manufacture a steel pipe having a dissimilar diameter in consideration of the shape from the blanking step to form the shape after welding and weld weld tube (Tailor weld tube) to produce the desired shape at a time is known, but such a method In order to take additional expensive equipment, it is not cost-effective to apply to the manufacture of relatively simple components, such as end tube 12.

Therefore, in the related art, after providing a capillary having a diameter of the center portion 12, the two ends of the capillary tube are pressed into a mold having a molding groove of a design standard for expanding the capillary tube, and both ends of the capillary tube are expanded to expand the pipe end tube 12. Was manufacturing.

By the way, the dimensional accuracy of the part where most parts are pipe-extended is very high.

For example, in the case of the tube expansion tube shown in the drawings, the standard required at the center is 44.4 mm in inner diameter, 48.6 mm in outer diameter, and 2.1 mm in thickness of the tube, and an outer diameter of 50.0 ± 0.1 mm is required in a 30 mm section at both ends.

2 is a perspective view showing a conventional expansion mold.

In the related art, an expansion mold 20 as shown in FIG. 2 is provided, and expansion operation is performed in such a manner that both sides of the mother tube are press-fitted into the molding groove 22 in the mold 20.

In the case of the conventional expansion mold, the size of the molding groove was formed according to a design standard for expanding the molding groove, and the prepared mother tube was pressed into the expansion mold to perform expansion pipe forming. An error occurs due to pressure and distortion between the mold and the separation, and frequently does not satisfy both the inner and outer diameters.

If this unexpected error occurs, it is necessary to modify the mold. In some cases, it is impossible to modify the mold. In some cases, the mold has to be discarded and then newly manufactured. It was difficult to judge precisely whether the desired standard was met, and it was a situation where a lot of trial and error were working.

SUMMARY OF THE INVENTION An object of the present invention is to provide an expansion mold apparatus for expanding an end of a metal tube, wherein a plurality of molds for receiving and expanding an end of the metal tube are divided into a plurality of molds, and the molds are movable so that the plurality of molds are movable. It is an object of the present invention to provide an expansion mold apparatus capable of correcting an error that can correct an error of the mold by correcting the position of the mold without modifying the mold itself.

According to an aspect of the present invention, there is provided an apparatus for expanding a tube for expanding an end portion of a tube, the mold apparatus including a molding groove accommodating an end portion of the tube, the mold portion being divided into a plurality of parts, and each of the divided mold portions formed with respect to the center of the tube. Provided is an expansion mold apparatus capable of error correction, including a mold conveying unit for uniformly moving radially.

The molding groove formed in the mold portion is formed to have a radius of curvature corresponding to the design specification to be expanded, and when the mold portion is closest, the distance from the center to the molding groove has a size smaller than the radius of the design specification. In the case where the mold part is most spaced apart, it is preferable that the distance from the center to the sexual groove is larger than the radius of the design specification.

The mold transfer part may include a fixed plate having a guide groove in a radial direction, and a rotating plate having a spiral groove formed at the same interval as the guide groove and spirally formed, wherein the mold part has the guide groove and the rear surface thereof. It is preferable to have a fixing part restrained by the spiral groove.

Expansion mold apparatus according to the present invention is divided into a plurality of molds for expanding the end of the pipe, and the divided mold is provided by the radially uniformly movable structure to ensure expansion by unexpected errors occurring during the expansion of the pipe Even if the pipe part's specification does not meet the design specification, it can reduce the cost and time required to modify the mold by providing a structure that can correct errors caused by easy mold position adjustment without additional mold modification or replacement work. It has an effect.

In addition, if the mold portion and the mold transfer part are configured to be detachable, it is possible to further reduce the cost required for the facility by allowing the expansion mold parts having different specifications to be used in combination with the same transfer part.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a vertical steel sheet coating apparatus according to the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator.

Therefore, definitions of these terms should be made based on the contents throughout the specification.

Figure 3 is a block diagram showing the structure of the expansion mold apparatus according to the present invention.

Expanding mold apparatus according to the present invention is a device for expanding the end of the pipe material to a desired standard, to provide a structure capable of finely adjusting the diameter of the expansion pipe.

Expanding mold apparatus according to the present invention is formed by dividing the mold portion into a plurality of mold parts and the mold parts are formed to be movable uniformly radially, to provide a structure capable of finely adjusting the diameter of the circle formed by the plurality of molds are connected. .

In other words, it is possible to adjust so as to satisfy the required product specifications of the expansion portion by moving the mold without additional mold modification.

To this end, the expansion mold apparatus according to the present invention includes a mold portion 110 which is divided into a plurality formed, and a mold transfer portion 120 capable of moving the mold portion 110 in an evenly radial manner.

The mold part 110 of the illustrated embodiment is divided into three mold pieces 112a, 112b, and 112c in an equal shape, but is not necessarily divided into three, but may be divided into four or more. have.

Since the number of divisions increases, the mold transfer part becomes more complicated, and thus it may be preferable to divide the mold into three or four parts. However, the number of divisions of the mold pieces may vary depending on the material, thickness, and diameter of the mother tube to be expanded.

Each mold piece 112a, 112b, 112c is arrange | positioned in the shape which equalizes a circle with respect to the same center C, and each mold piece 112a, 112b, 112c has the shaping | molding groove 114a which has the same radius of curvature. , 114b, 114c).

The radius of curvature of the forming grooves 114a, 114b, and 114c is formed in a design standard to be expanded (standard to be expanded). In addition, each of the forming grooves 114a, 114b, 114c is formed to be wider and narrower as it enters the inside of the mold piece.

4 is a conceptual diagram showing a relationship between a design specification and divisional formation of a mold part.

The mold part 110 formed by combining a plurality of mold pieces 112a, 112b, and 112c is formed such that the molding grooves 114a, 114b, and 114c of the respective mold pieces 112a, 112b, and 112c are connected in a circle. do.

In reality, the shape may be round depending on the distance between the mold pieces 112a, 112b, and 112c, or may be in a form in which arcs other than circles are connected to each other. If the mold pieces 112a, 112b, and 112c are arranged according to the design specification, the connecting grooves 114a, 114b, and 114c form a round shape corresponding to the design specification, but the mold pieces 112a, 112b, and 112c are connected. ) Are smaller or larger than the design specification, the arcs are connected rather than the circle.

Importantly, the mold pieces 112a, 112b and 112c should be formed to have a diameter smaller than the design specification in the closest case. Here, the diameter refers to the diameter of the center of the mold parts and the beginning of the mold groove formed.

That is, the arrangement as shown is a state in which the mold pieces are arranged in accordance with the design specifications, when the mold pieces (112a, 112b, 112c) in close proximity in this state, forming grooves 114a formed in the mold pieces (112a, 112b, 112c) , 114b and 114c form a smaller diameter than the design specification, and when the mold pieces 112a, 112b and 112c are spaced apart, the forming grooves 114a, 114b and 114c formed in the mold pieces 112a, 112b and 112c. They will form a diameter larger than the design specification.

However, since the radius of curvature of the forming grooves 114a, 114b, and 114c formed in the mold pieces 112a, 112b, and 112c does not change, the mold pieces 112a, 112b, and 112c are arranged to conform to the design specification. When the grooves are formed, the circle is formed, but when the shape is smaller or larger than the design specification, the circle is not a circle but the shape is close to the circle, but the movement of the mold parts is fine, and the diameter to be formed is actually the design standard. In swelling the error of this shape is not a problem.

Because the present invention is not intended to expand to a variety of standards, but to provide an expansion mold apparatus that can match the error caused in the expansion to the design specifications without a separate mold modification, the size of the expanded mother pipe is designed This is because it corresponds to the standard.

Figure 5 is an exploded perspective view showing the structure of the mold transfer unit of the expansion mold apparatus according to the present invention.

As shown, the mold transfer part 120 is interlocked with the stationary plate 122 and the stationary plate 122 supporting the rear surface of the mold unit 110 composed of a plurality of mold pieces 112a, 112b, 112c. And a rotating plate 124 which moves the mold pieces 112a, 112b, 112c of the 110 in a radial uniform manner.

Each mold piece 112a, 112b, 112c has a fixed shaft 115 formed on its rear surface, and each fixed shaft 115 is connected to the rotating plate 124 through the fixing plate 122.

The guide plate 123 corresponding to the number of mold pieces 112a, 112b and 112c is formed in the fixed plate 122, and the spiral groove corresponding to the number of mold pieces 112a, 112b and 112c is also formed in the rotating plate 124. 125 is formed.

Guide grooves 123 formed in the fixed plate 122 is formed in the radial direction, the spiral groove 125 is formed in the form of a spiral that rotates in a clockwise or counterclockwise direction according to the change of the radius. In the illustrated embodiment, the spiral groove 125 is formed in a shape that rotates counterclockwise as the radius increases.

The fixed shaft 115 is constrained to the guide groove 123 of the fixing plate 122 and the spiral groove 125 of the rotating plate 124, and the sliding shaft 115 is slidably movable with respect to the guide groove 123 of the fixing plate 122. Is connected, it is also connected to the spiral groove 125 so as to be slidable. That is, since the position of the fixed shaft 115 is determined according to the relative positions of the spiral groove 125 and the guide groove 123, the mold pieces 112a, 112b, 112c as the rotating shaft rotates clockwise or counterclockwise. Are gathered toward the center or spaced radially.

6 is a conceptual view for explaining the operation structure of the fixing plate and the spiral groove of the expansion mold apparatus according to the present invention.

As shown, in the state in which the mold parts are arranged in accordance with the design standard, the fixing shaft 115 of each of the mold pieces 112a, 112b, 112c is formed at the center of the guide groove 123 formed in the fixing plate 122. It is also located in the center of the spiral groove 125 of the rotating plate 124. The fixed shaft 115 is connected to the spiral groove 125 through the guide groove 123, so that the position of the fixed shaft 115 is always located at the portion where the guide groove 123 and the spiral groove 125 overlap. do. As shown in the drawing, if the mold pieces 112a, 112b, and 112c are arranged in a design standard, the fixed shaft may be adjusted to a size smaller than the design specification only when the fixed shaft is positioned at the center of the guide groove 123 and the spiral groove 125. In addition, it can be adjusted to a size larger than the design specification.

As shown in Figure 6, the mold pieces (112a, 112b, 112c) in accordance with the design specifications are placed in the state of inserting the capillary to perform the expansion work, and as a result of measuring the specifications of the expanded portion is the size of the expanded portion If the size is smaller than the desired size, the error can be corrected by increasing the distance between the mold pieces 112a, 112b, and 112c to increase the overall diameter.

When rotating the rotating plate (124 of Figure 5) in the clockwise direction based on the drawing, the portion where the spiral groove 125 and the guide groove 123 overlaps the outer side of the guide groove 123 (away from the center of the circle) Will be moved to).

As the fixed shaft 115 is constrained by both the guide groove 123 and the spiral groove 125 as described above to be located in the overlapping portion, as the rotating plate 124 rotates, the outside of the fixed shaft 115 The mold pieces 112a, 112b, and 112c move away from each other evenly toward each other. By adjusting the distance between the mold pieces (112a, 112b, 112c) without modifying the mold it is possible to adjust the error occurring during expansion.

On the contrary, as a result of the expansion operation, when the size of the expansion portion is larger than the desired specification, it is necessary to narrow the interval between the mold pieces 112a, 112b, 112c to reduce the overall diameter. In this case, when the rotating plate is rotated counterclockwise, the gap between the mold pieces 112a, 112b, and 112c is narrowed, and the overall diameter is reduced, so that the error can be adjusted by changing the positions of the molds without additional mold modification. Will be.

As described above, the expansion mold apparatus for error correction according to the present invention is formed at the time of expansion operation by dividing the mold portion into a plurality of mold pieces, and providing a structure in which each mold piece can move radially and uniformly. This error can be corrected through simple mold movement without modification or replacement of the mold.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a cross-sectional view showing the structure of the tube expansion tube

Figure 2 is a perspective view showing a conventional mold for expanding,

Figure 3 is a block diagram showing the structure of the expansion mold apparatus according to the present invention

4 is a conceptual diagram showing the relationship between the design specification and the divisional formation of the mold part;

5 is an exploded perspective view showing a structure of a mold conveying part of the expanding mold apparatus according to the present invention;

Figure 6 is a conceptual diagram for explaining the operation structure of the fixing plate and the spiral groove of the expansion mold apparatus according to the present invention.

Claims (6)

In the expansion mold apparatus for expanding the end of the pipe, A mold part having a molding groove for receiving an end of the pipe and divided into a plurality of mold parts; A mold transfer part for uniformly radially moving each of the divided mold parts to the center of the tube; The mold conveying part and the fixed plate having a radial guide groove; Is formed at the same interval as the guide groove and includes a rotating plate having a spiral groove formed in a spiral, The mold part has a fixing part which is constrained by the guide groove and the spiral groove on the rear surface, the fixing part is a linear movement in the guide groove, The molding groove formed in the mold portion is formed to have a radius of curvature corresponding to the design standard to be expanded, When the mold part is closest to the center, the distance from the center to the molding groove is smaller than the radius of the design specification. When the mold part is most spaced from the center, the distance from the center to the sexual groove is smaller than the radius of the design specification. Expansion mold apparatus characterized by having a large size. delete The method of claim 1, Expanding mold apparatus, characterized in that the mold portion is divided into three evenly formed. The method of claim 1, Expanding mold apparatus, characterized in that the mold portion is divided into four or more numbers. delete delete

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