KR102587769B1 - Apparatus for forming groove in metal tube - Google Patents

Abstract

The present invention includes a tube fixing part (10), a movable part provided with a spacing adjustment plate (23) on the inside of which is provided a guide surface; It is a groove forming mechanism for a metal tube for fitting consisting of a tube forming part, and first and second stoppers (233, 235) are formed opposing each other on the guide surface of the spacing adjustment plate (23), and the guide surfaces are formed with first and second opposing stoppers. It consists of first and second guide surfaces (234, 236) formed in point symmetry on one side and the other side of the stoppers (233, 235), and the cover (25) has first and second guide surfaces (234, 236) facing each other at a certain distance from each other. Two long holes (251, 253) are formed, respectively; The tube forming part has an outer surface in contact with the first guide surface 234, and on one side of the upper surface, a first spacing pin 317 extends vertically upward for a certain length and is exposed through the first long hole 251 of the cover 25. A first movable housing 311 and a forming roller 31 rotatably mounted on the inner part of the first movable housing 311 and provided with a forming wheel 313 having at least one forming blade 314 on the outer surface, 1 It faces the movable housing 311, but the outer surface is in contact with the second guide surface 236, and on the other side of the upper surface, a second spacing pin 337 extends vertically upward by a certain length to form a second long hole 253 of the cover 25. ) consisting of a second movable housing 331 exposed through, a pair of left and right support rollers 33 provided with a support wheel 335 rotatably mounted on the inner part of the second movable housing 331; Provided is a groove forming mechanism for a metal tube for fitting with increased forming force.

Description

Apparatus for forming groove in metal tube for fittings with increased forming force {Apparatus for forming groove in metal tube}

The present invention relates to a molding device capable of forming a groove on the surface of a metal tube. More specifically, the molding wheel that directly forms the groove on the surface of the tube and the support wheel that supports the pressing force by the molding wheel are positioned opposite each other. It relates to a groove forming mechanism for metal tubes for fittings that can provide improved forming force by using a two-point contact method and can very easily form grooves even in tubes of a certain thickness or more.

Typically, ferrules are used in metal tube fittings through which high-pressure fluid flows. When the nut is rotated while the metal tube through which the ferrule is inserted is inserted into the body, the tip of the ferrule is deformed by the rotation of the nut and the metal tube is formed. Fitting is achieved by strongly gripping the surface.

On the other hand, if there is damage to the surface of the metal tube, leakage may occur through the damaged area in a high-pressure environment, and if the hardness of the ferrule is lower than that of the metal tube, proper gripping is not possible, so heat treatment such as nitriding treatment is performed. Fitting work on a metal tube is being performed using a ferrule. However, when heat treatment is performed on the ferrule, the hardness of the ferrule can be increased, but there is a problem in that the corrosion resistance of the ferrule is lowered, which acts as a potential cause of leakage.

For this purpose, the applicant has proposed a groove forming device such as Republic of Korea Patent No. 1530670, which can form grooves in a metal tube through artificial work. This technology includes a tube fixing part 100, a tube forming part 200, and a movable part 300, as shown in each of FIGS. 6A and 6B, and in particular, the tube forming part 200 has a gap. It is characterized by being provided with an adjustment plate 220, a forming roll 270, and a driven roll 280.

Through this configuration, when the tube is inserted to a certain depth, one side of the tube is fixed with the tube fixing part 100, and then the movable part 300 is operated to bring the tube forming part 200 into close contact with the tube, and in this state, the groove is formed. When the mechanism is rotated in one direction, the forming blade 272 provided on the forming roll 270 rotates along the surface of the tube tightly restrained by the tube fixing part 100, forming a groove of a certain depth on the surface of the metal tube. is formed.

In this case, not only can grooves be very easily formed on the surface of a metal tube with a certain thickness, but it is also possible to form grooves of different depths on the surface of the metal tube by adjusting the position of the forming blade at certain intervals. You can. However, this technology had the limitation that the forming force by the forming roller was somewhat low in that the tube as the work object was formed in a three-point structure using a center forming roller and a driven roller.

This is because, in the three-contact structure forming method, when the forming roller equipped with the forming blade presses the first contact point on the tube surface, the two driven rollers support the second and third contact points on the tube surface. In this way, the forming roller If the driven roller does not receive and support the pressing force transmitted by the forming blade in contact with the tube in a vertical state, but rather receives and supports it in a state spaced at a certain angle to the left and right, the force acting through the forming blade is bound to be naturally distributed and lowered. , which leads to a decrease in the forming force on the surface of the metal tube.

Republic of Korea Patent No. 1530670

The present invention was proposed to solve the problems of the prior art, and the purpose of the present invention is to provide a groove forming device for a metal tube that not only improves forming force but also allows more easily identifying the forming depth of the groove.

In order to achieve the above object, the present invention includes first and second fixing handles (11, 13), each of the other end and one end is coupled to each of the first and second fixing handles (11, 13) to press one side of the tube (P) inserted through the insertion hole. A tube fixing part (10) provided with first and second fixing ends (15, 17); A gap adjustment handle (21) located at right angles to the first fixed handle (11) on the upper side and provided with a worm gear (211) on one side, and a worm wheel (21) engaged with the worm gear (211) of the gap adjustment handle (21) on the outside. 231) is provided, and on the inner side, a spacing adjustment plate 23 is provided with a guide surface whose degree of protrusion toward the center varies continuously, and a movable portion provided with a cover 25 that seals the upper portion of the spacing adjustment plate 23; A groove forming device for a metal tube for fitting, which consists of a tube forming part that is provided inside the spacing adjustment plate (23) of the movable part and forms a groove on the other side of the tube (P) inserted through the insertion hole of the tube fixing part (10), First and second stoppers 233 and 235 are formed on the guide surface of the spacing adjustment plate 23 to face each other, and the guide surface is formed on one side and the other side of the first and second stoppers 233 and 235, respectively, facing each other. It consists of first and second guide surfaces (234, 236) formed with point symmetry, and first and second long holes (251, 253) are formed in the cover (25) to face each other at a predetermined distance; The outer surface of the tube forming part is in contact with the first guide surface 234, and on one side of the upper surface, a first spacing pin 317 extends vertically upward for a certain length and is exposed through the first long hole 251 of the cover 25. A first movable housing 311 and a forming roller 31 rotatably mounted on the inner part of the first movable housing 311 and provided with a forming wheel 313 having at least one forming blade 314 on the outer surface, It faces the first movable housing 311, but its outer surface is in contact with the second guide surface 236, and on the other side of the upper surface, a second spacing pin 337 extends vertically upward for a certain length to form a second long hole in the cover 25 ( The second movable housing 331 exposed through 253) consists of a pair of left and right support rollers 33 provided with a support wheel 335 rotatably mounted on the inner part of the second movable housing 331; Its technical characteristics are:

An arc-shaped concave surface 333 may be formed on the inner upper surface of the second movable housing 331 to prevent interference with the tube P being held.

The present invention provides improved forming force by introducing a two-point contact method in which a support wheel is placed in a position opposite to the forming blade with respect to the tube in forming a groove on the surface of the tube using the pressing force of the forming blade. Of course, this is possible, and grooves can be formed very easily on tubes of a certain thickness or more.

In addition, in the present invention, the support wheel opposing the forming wheel is composed of a pair of left and right sides, so that each of the forming wheel and the support wheel forms an isosceles triangle structure with a narrow base width and is in close contact with the tube, so that two points are obtained even without the use of separate parts. It is possible to very easily solve the shortcomings of the contact method.

In addition, the present invention allows the operator to visually check in real time the degree of movement of the spacing pin, which is directly related to the close contact between the tube and the forming wheel, making it possible to more accurately control the depth of groove formation in the tube. .

In addition, the present invention forms a concave surface on the upper part of the support roller where the support wheel is located to prevent interference that may occur between the support roller and the tube when the tube is supported by a pair of left and right support wheels. By doing so, even if the tube has a diameter above a certain size, groove forming work is possible while it is very stably supported by the support roller.

1 is a schematic plan view of a groove forming mechanism for a metal tube for fitting according to the present invention.
Figure 2 is a schematic plan view of the movable part and the tube forming part in the groove forming mechanism for a metal tube for fitting according to the present invention.
Figure 3 is a schematic cross-sectional diagram of line A - A' in Figure 1.
4A and 4B each show a schematic plan view and perspective view of a forming roller and a support roller in the groove forming device for a metal tube for fitting according to the present invention.
5A to 5C are schematic operational configuration diagrams of a groove forming mechanism for a metal tube for fitting according to the present invention.
Figure 6a is a schematic configuration diagram of a conventional groove forming mechanism for a metal tube for fitting.
Figure 6b is a schematic perspective view of the forming roller and driven roller in Figure 6a.

Preferred embodiments according to the present invention will be examined in detail with reference to the accompanying drawings as follows. In describing the embodiments of the present invention in detail, there is no direct relationship with the technical features of the present invention, or general knowledge in the technical field to which the present invention belongs. Detailed explanations will be omitted for matters that are obvious to those with knowledge.

The present invention relates to a groove forming mechanism for metal tubes for fittings, and is characterized by consisting of a tube fixing part (10), a moving part, and a tube forming part. Each of these configurations is as follows with reference to the attached drawings, but descriptions of parts that are substantially the same as those disclosed in Republic of Korea Patent No. 1530670 will be omitted.

The tube fixing part 10 is a part that fixes the tube P as a work object and includes first and second fixing handles 11 and 13 and first and second fixing ends 15 and 17. The lower part of the tube fixing part 10 is sealed by a cover (not shown). An insertion hole (not shown) into which the tube (P) is inserted is formed in the central part of the cover.

The other side and one side of each of the first and second fixing handles 11 and 13 protrude a certain length to the outside of the tube fixing part 10. Threads are formed on one side and the other side of each of the first and second fixing handles (11, 13) and are screwed together with the tube fixing part (10). First and second handles (not shown) are provided on the other side and one side of the first and second fixing handles 11 and 13, respectively.

The other ends and one ends of the first and second fixing ends 15 and 17 are coupled to the first and second fixing handles 11 and 13, respectively, as shown in FIG. 2 . Accordingly, when each of the first and second fixing handles (11, 13) rotates in one direction and the other direction (or the other direction and one direction), each of the first and second fixing ends (15, 17) advances and passes through the insertion hole. Pressurize and secure one side of the inserted tube (P).

The movable part moves the tube forming part forward or backward to bring the other side of the tube (P), one part of which is fixed by the tube fixing part 10, into close contact with or separate from the tube forming part, as well as the depth of the groove formed on the surface of the tube. The part that adjusts includes a gap adjustment handle 21, a gap adjustment plate 23, and a cover 25, as shown in FIG. 3.

The spacing adjustment handle 21 is perpendicular to the first fixing handle 11 and is located on the upper side, and a worm gear 211 is provided on one side thereof. A handle (not shown) is provided on the other side of the spacing adjustment handle 21.

The spacing adjustment plate 23 is a means of advancing or retracting the tube forming part, and a worm wheel 231 is provided on the outside thereof, and a guide surface is provided on the inside thereof. The worm wheel 231 is meshed with the worm gear 211 of the gap adjustment handle 21. The guide surface is made of a continuous surface that protrudes toward the center, and the degree of protrusion is continuous and varies.

At this time, first and second stoppers 233 and 235 are formed on the guide surface as shown in FIG. 3, and the first and second stoppers 233 and 235 each have the characteristic of being formed to face each other. In addition, the guide surface consists of first and second guide surfaces (234, 236) provided on one side and the other side of the first and second stoppers (233, 235), respectively, and the first and second guide surfaces (234, 236) ) has the characteristic of forming point symmetry. That is, when the first guide surface 234 is rotated 180° with respect to the center of the insertion hole of the tube fixing part 10, it overlaps the second guide surface 236.

The cover 25 seals the upper portion of the gap adjustment plate 23 as shown in FIG. 1. In the cover 25, first and second long holes 251 and 253 are formed facing each other and spaced at a certain interval. First and second spacing pins (317, 337) are inserted through each of the first and second long holes (251, 253), and guide the forward and backward movement of the first and second spacing pins (317, 337), respectively.

The tube forming part is a part that forms a groove of a certain depth on the surface of the other side of the tube (P), and is characterized by being composed of a forming roller 31 and a support roller 33, as shown in FIGS. 4A and 4B, respectively.

The forming roller 31 is a part that presses the surface of the tube P and directly forms a groove, and includes a first movable housing 311 and a forming wheel 313. The first movable housing 311 may have a U-shaped structure with a space of a certain size on the inner side, and the first contact surface 312 formed on the outer surface is aligned with the first guide surface 234 of the spacing adjustment plate 23. ) is in contact with.

At this time, on one side of the upper surface of the first movable housing 311, a first spacing pin 317 extends vertically upward for a certain length and protrudes. The first spacing pin 317 is a means for identifying the degree of adhesion (depth of the groove) between the forming blade 314 provided on the forming wheel 313 and the tube (P), and its upper portion is the cover 25. It is exposed through the first long hole (251).

When the gap adjustment plate 23 rotates in one direction (or the other direction) while the first movable housing 311 is in contact with the first guide surface 234 of the gap adjustment plate 23, the first movable housing 311 is spaced apart. It advances toward the center of the control plate 23, and the first spacing pin 317 connected to the first movable housing 311 also advances along the first long hole 251.

That is, the first spacing pin 317 advances along the first long hole 251 by the distance that the first movable housing 311 containing the forming wheel 313 advances. Therefore, unlike the prior art of FIG. 6A, which was able to control the depth of groove formation by measuring only the degree of rotation of the spacing adjustment plate 23 as indirect information rather than direct information related to the movement of the forming wheel, the present invention provides information on the relationship between the tube and the forming wheel. Since the exact forward distance of the first movable housing 311 itself, which is directly related to the close contact between the liver, can be accurately determined in real time, it is possible to more accurately control the depth of groove formation in the tube.

The forming wheel 313 is rotatably mounted in the inner space of the first movable housing 311, and at least one forming blade 314 is provided on its outer surface. The forming blade 314 may have a cross-section of various structures. Reference numeral 316 denotes a shaft penetrating the central portion of the forming wheel 313.

The support roller 33 is a part that faces the pressure roller 31 and stably supports the tube P, and includes a second movable housing 331 and a support wheel 333. Similar to the first movable housing 311, the second movable housing 331 may also have a U-shaped structure with a space of a certain size on the inside, and is located opposite the first movable housing 311. The second contact surface 332 formed on the outer surface of the second movable housing 331 contacts the second guide surface 236 of the spacing adjustment plate 23.

On the other side of the upper surface of the second movable housing 331, a second spacing pin 337 extends vertically upward for a certain length and protrudes. The second spacing pin 337 is a means for identifying the degree of adhesion between each of the support wheels 335 and the tube P, and its upper portion is exposed through the second long hole 253 of the cover 25.

The support wheel 335 consists of a pair of left and right wheels and is rotatably mounted in the inner space of the second movable housing 331. Each of the support wheels 335 may have a cylindrical structure, and a certain gap may be formed between the support wheels 335. Reference numeral 336 denotes a shaft penetrating the central portion of each support wheel 335.

In this way, when the first and second movable housings 311 and 331 are positioned opposite to each other, the forming wheel 313 mounted on the first movable housing 311 and the second movable housing 331 are mounted as shown in FIG. 4A. The pair of left and right support wheels 335 are in close contact with the tube P and face each other in a nearly vertical form with respect to the tube P interposed between them.

In this state, when the forming blade 314 provided on the forming wheel 313 presses a specific surface area of the tube P, the pressing force transmitted to the tube P by the forming blade 314 is not dispersed and forms It faces the blade 314 and is concentrated and transmitted in the direction of the support wheel 335 located on the opposite side.

That is, unlike the prior art (FIG. 6b), in which the pressing force was inevitably distributed according to the three-point contact method, in the present invention, the groove forming operation itself by the forming blade 314 is stably supported by the support wheel 335. It is possible to provide improved molding force in that it is a configuration as close to the two-point contact method as possible. It is obvious that if the forming force itself increases, a tube P of a certain thickness or more can very easily form a groove.

In addition, in the present invention, the support wheel 335 is composed of a pair of left and right sides, and as can be seen in FIG. 4A, the forming wheel 313 and the support wheel 335 form an isosceles triangle structure with a narrow base width, and the tube It adheres closely to (P). In this case, since the center of the axis can be set naturally, the shortcomings of the two-point contact method can be resolved very easily even without a separate configuration.

Meanwhile, the present invention proposes a case where a concave surface 333 is formed on the inner upper surface of the second movable house 331, as shown in FIGS. 4A and 4B, respectively. The concave surface 333 is a part to prevent interference with the tube P being held, and is preferably formed in an arc shape as shown in the drawing.

As described above, in the present invention, the support wheel 335 is composed of a left and right pair, so the tube P contacts the support wheel 335 at two points. For this reason, when the diameter of the tube (P) increases beyond a certain size, the inner upper surface of the second movable housing (331) contacts the tube (P) first, and the support wheel (335) does not contact the tube (P). You may not be able to. Therefore, it is possible to prevent this phenomenon in advance by forming a concave surface 333 in the second movable housing 331 as shown in the drawing.

The schematic operating structure of the present invention consisting of this structure will be examined with reference to the attached drawings and the description of each of the above-mentioned structures.

First, as shown in Figure 2, one end of the tube (P) requiring work is inserted through the insertion hole of the tube fixing part (10) and then pushed upward to a certain depth. When the tube (P) is inserted to a certain depth, an external force is applied to rotate the first and second fixing handles (11, 13) in one direction and the other, respectively. Accordingly, each of the first and second fixing ends 15 and 17 secures and restrains the tube P while advancing in the direction of the insertion hole.

When the tube (P) is restrained by the first and second fixing ends (15, 17), the spacing adjustment handle (21) is rotated by a certain angle. At this time, the worm gear 211 of the gap adjustment handle 21 is meshed with the worm wheel 231 of the gap adjustment plate 23, and the first contact surface 312 of the forming roller 31 and the support roller ( Since each of the second contact surfaces 332 of 33) is in close contact with the first and second guide surfaces 234 and 236, respectively, the spacing adjustment plate 23 rotates in one direction as the spacing adjustment handle 21 rotates. .

When the spacing adjustment plate 23 rotates in one direction, each of the forming roller 31 and the support roller 33 advances toward the center and comes into contact with one side and the other side of the tube P, respectively, as shown in FIG. 5b. That is, the forming blade 314 of the forming roller 31 is in contact with one surface of the tube (P), and the support wheel 335 of the support roller 33 faces the forming wheel 313 and is in contact with the surface of the tube (P). It comes into contact with the other surface.

In this state, when the spacing adjustment handle 21 is rotated a little more in one direction, the forming blade 314 of the forming roller 31 presses one surface of the tube P to a certain depth, and the support roller 33 The support wheel 335 faces the forming wheel 313 in a perpendicular state and supports the pressing force of the forming blade 314. The degree of pressurization of the forming blade 314 depends on the degree of rotation of the spacing adjustment handle 21, which determines the groove forming depth of the tube (P).

At this time, the first and second spacing pins (317, 337) of the forming roller (31) and the support roller (33) respectively advance toward the center together with the first and second movable housings (311, 331), and the operator moves Simply rotate the spacing adjustment handle (21) while taking into account the degree of advancement of the first and second spacing pins (317, 337). To properly measure the pressing force (groove formation depth), separate scales may be marked on each of the first and second through holes 251 and 253.

When this work is completed, the lower part of the tube (P) is restrained by the first and second fixing ends (15, 17), and one surface of the upper part of the tube (P) is pressed by the forming blade (314). , the other surface of the upper part of the tube (P) is supported by the support wheel 335. In this state, the operator holds the first fixed handle 11 and rotates the movable part and the tube forming part together in one direction.

Since the lower part of the tube (P) is stably restrained by the tube fixing part (10), when the movable part and the tube forming part rotate in one direction, the surface of the tube (P) is naturally formed to a depth determined by the forming blade (314). Grooves are formed naturally. In the process of forming the groove, each of the forming wheel 313 and the support wheel 335 passively rotates around the shafts 316 and 336, respectively.

When a groove is formed on the surface of the tube (P) with the intended depth, the spacing adjustment handle (21) is rotated by a certain angle in the other direction. Accordingly, the spacing adjustment plate 23 rotates in the other direction as shown in Figure 5c, and as each of the forming roller 31 and the support roller 33 moves away from the center (retracts), the upper part of the tube P is formed by the tube forming means. Released from the restraints of (200). Subsequently, the first and second control handles (11, 13) are rotated in the other direction and one direction, respectively, to separate the first and second fixing ends (15, 17) that are restraining the tube (P), respectively, and the operator removes the tube ( When P) is removed from the forming tool, the forming work on the tube is completed.

Although the description above is limited to preferred embodiments of the present invention, this is only an example, and the present invention is not limited thereto and can be modified and implemented in various ways, and further, separate technical features are provided based on the disclosed technical idea. It is obvious that it can be added and implemented.

10: Tube fixing means 11, 13: 1st and 2nd fixing handles
15, 17: 1st and 2nd fixed ends 21: Spacing adjustment handle
231: worm gear 23: gap adjustment plate
231: Worm wheel 233, 235: 1st, 2nd stopper
234, 236: first and second guide surfaces 25: cover
251, 253: 1st, 2nd through hole 31: Forming roller
33: Support rollers 311, 331: First and second movable housings
312, 332: 1st and 2nd contact surfaces 313, 335: forming wheel, support wheel
314: forming blade 317, 337: first and second spacing pins
P: tube

Claims (2)

The first and second fixing handles (11, 13) are located at regular intervals to the left and right of the insertion hole formed in the center, and each of the other side and one side protrudes by a certain length, and the other end and one end of each respectively. The first and second fixing ends (15, 17) are coupled to one end and the other end of each of the first and second fixing handles (11, 13) and pressurize one side of the tube (P) inserted through the insertion hole. Tube fixing part (10) provided; A gap adjustment handle (21) located at right angles to the first fixed handle (11) on the upper side and provided with a worm gear (211) on one side, and a worm wheel (21) engaged with the worm gear (211) of the gap adjustment handle (21) on the outside. 231) is provided, and on the inner side, a spacing adjustment plate 23 is provided with a guide surface whose degree of protrusion toward the center varies continuously, and a movable portion provided with a cover 25 that seals the upper portion of the spacing adjustment plate 23; A groove forming device for a metal tube for fitting consisting of a tube forming part that is provided inside the spacing adjustment plate (23) of the movable part and forms a groove on the other side of the tube (P) inserted through the insertion hole of the tube fixing part (10),
First and second stoppers 233 and 235 are formed on the guide surface of the spacing adjustment plate 23 to face each other, and the guide surface is formed on one side and the other side of the first and second stoppers 233 and 235 that face each other. It consists of first and second guide surfaces 234 and 236, each of which is formed in point symmetry, and first and second long holes 251 and 253, which face each other at a certain distance from each other, are formed on the cover 25, respectively. ;
The outer surface of the tube forming part is in contact with the first guide surface 234, and on one side of the upper surface, a first spacing pin 317 extends vertically upward for a certain length and is exposed through the first long hole 251 of the cover 25. A first movable housing 311 and a forming roller 31 rotatably mounted on the inner part of the first movable housing 311 and provided with a forming wheel 313 having at least one forming blade 314 on the outer surface, It faces the first movable housing 311, but its outer surface is in contact with the second guide surface 236, and on the other side of the upper surface, a second spacing pin 337 extends vertically upward for a certain length to form a second long hole in the cover 25 ( The second movable housing 331 exposed through 253) consists of a pair of left and right support rollers 33 provided with a support wheel 335 rotatably mounted on the inner part of the second movable housing 331;
A groove forming device for a metal tube for fitting with increased forming force. According to paragraph 1,
Groove of the metal tube for fitting with increased forming force, characterized in that an arc-shaped concave surface 333 is formed on the inner upper surface of the second movable housing 331 to prevent interference with the tube P being held. molding device.

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