KR102506551B1 - Grinding tool assembly for seamless pipe piercing roll - Google Patents

Abstract

The present invention relates to a grinding tool assembly for a seamless pipe piercing roll for grinding damage to the surface of a piercing roll generated by friction with a round bar when piercing the round bar with a seamless pipe. To this end, the grinding tool assembly comprises: a grinding unit entering a space unit between two rotating piercing rolls to grind a damaged surface of the piercing roll; a head unit coupled to one side of the grinding unit and having a relatively smaller diameter than the grinding unit; and an adapter coupled to the other side of the grinding unit and having a connection shaft connected to a mandrel rod.

Description

Seamless pipe piercing roll polishing tool assembly {GRINDING TOOL ASSEMBLY FOR SEAMLESS PIPE PIERCING ROLL}

The present invention relates to a seamless pipe piercing roll abrasive tool assembly for grinding damage (foreign matter sticking, dents, cracks, dents) on the surface of a piercing roll caused by friction with a round bar when piercing a round bar with a seamless pipe. In detail, it relates to a seamless pipe piercing roll polishing tool assembly capable of grinding the surface of the piercing roll without separating the piercing roll from the roll housing.

In general, stainless steel is a material that has excellent mechanical properties such as corrosion resistance, heat resistance and strength, and is widely applied to almost all industrial fields in addition to plant piping, energy, automobile parts, aerospace and marine industries.

In particular, the importance of stainless steel has recently been increasing in the field of new and renewable energy. As the hydrogen economy roadmap was announced under the leadership of the government in 2019, it is attracting attention as an essential component material in the hydrogen charging infrastructure industry.

The hydrogen filling station is designed to control the pressure and temperature in the hydrogen filling process within a certain range in order to secure hydrogen filling efficiency and stability. Since a material capable of withstanding hydrogen pressure is required, austenitic stainless steels such as SUS660 and SUS316, which have excellent hydrogen embrittlement resistance, are mainly used.

In particular, in the case of core components and piping such as compressors, dispensers, and coolers with low exposure temperatures and high pressures in hydrogen filling stations, these stainless steels are used, and at the same time, seamless pipes are used to prevent leakage at pipe joints. are necessarily employed.

Such a seamless pipe is usually manufactured as a psychological pipe having planned external and internal diameters by drilling a plug while rotating a round bar by two piercing rolls.

At this time, as shown in FIG. 7 , when the piercing roll is used for a long period of time, foreign matter is adhered to the surface due to physical contact with the round bar, or damage such as dents, cracks, or dents occurs.

Such damage to the surface of the piercing roll causes problems such as damage to the psychological pipe product, such as cracks or stripes on the surface of the psychological pipe being pierced.

Therefore, in the prior art, when the surface of the piercing roll is damaged, it is reused by replacing it or polishing the surface.

However, conventional piercing rolls are very expensive, heavy and not easy to replace, so a surface polishing operation has to be performed.

In the case of performing normal polishing work, as shown in FIG. 8, since the upper part of the roll housing supporting the piercing roll must be separated and the person directly polishing the piercing roll seated in the roll housing, safety accidents and highly skilled personnel during polishing work There was a problem that the polishing work had to be performed over a long period of time.

In addition, when the surface of the piercing roll is severely damaged, as shown in FIG. 9 , after the piercing roll is completely separated from the roll housing, a person must directly polish the piercing roll from the outside.

Therefore, when the piercing roll polishing operation is performed manually, the operation of the device must be stopped for a long time, resulting in very low productivity of the psychological pipe.

Republic of Korea Patent No. 10-1932185

The present invention has been devised in view of the above problems, and a first object of the present invention is a seamless pipe piercing roll polishing tool capable of grinding the surface of the piercing roll without separating the piercing roll from the roll housing. to provide an assembly.

A second object of the present invention is to provide a seamless pipe piercing roll polishing tool assembly in which a grinding unit for grinding the surface of a piercing roll can be easily replaced.

A third object of the present invention is to provide a seamless pipe piercing roll polishing tool assembly that allows the surface of the piercing roll to be ground more easily by using the rotational force of the piercing roll.

According to a feature for achieving the above object, the first invention is a seamless pipe piercing roll abrasive tool assembly for grinding surface damage of a piercing roll caused by friction with a round bar when piercing a round bar with a seamless pipe. To this end, a polishing unit that enters the space between two rotating piercing rolls and polishes the damaged surface of the piercing roll; and a head unit coupled to one side of the polishing unit and having a relatively smaller diameter than the polishing unit; And an adapter coupled to the other side of the polishing unit and having a connecting shaft connected to the mandrel rod; inserting a support shaft for supporting the free end of the polishing tool assembly rotating by contact with the piercing roll at the front end of the head unit It is characterized in that the center groove is further formed in order to.

In the second invention, in the first invention, the adapter further includes a coupling shaft coupled to the head portion across the inner center of the polishing unit on one side, and an outer circumferential surface of the coupling shaft to constrain the polishing unit to increase binding force. It is characterized in that 2 or 3 or 4 wing parts are further formed.

In the third invention, in the first invention, each of the piercing rolls has an initial elevation surface portion for guiding the round bar, a first tapered portion having a smaller diameter across the first boundary surface in the initial elevation portion, and the first taper portion and It consists of a second tapered portion whose diameter is relatively larger and smaller with the second boundary surface therebetween, and the polishing portion includes a first grinding portion partially corresponding to the initial elevation portion as a whole in a state in which two piercing rolls are aligned side by side; Consisting of a second grinding part corresponding to the first boundary surface, a third grinding part corresponding to the first taper part, a fourth grinding part corresponding to the second boundary surface, and a fifth grinding part partially corresponding to the second taper part characterized by

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In the fifth invention, in the first invention, a friction pad made of Teflon is inserted into the center groove to generate frictional force with the support shaft to reduce the number of rotations of the abrasive tool assembly that rotates simultaneously with the piercing roll. to be characterized

In the 6th invention, in the 1st invention, the polishing unit maintains thermal stability up to 1370 ° C. and generates little grinding heat, so CBN (Cubic Boron Nitride, cubic boron nitride) abrasive grains, which are superabrasive raw materials, have very little effect on the workpiece due to heat generation. It is characterized in that it is formed by molding.

According to the psychological pipe piercing roll polishing tool assembly of the present invention, safety accidents can be prevented because the piercing roll is not separated from the roll housing.

In addition, since the surfaces of the two piercing rolls can be simultaneously ground, workability is improved.

In addition, since the grinding unit for grinding the surface of the piercing roll can be easily replaced, the grinding work can be shortened as much as possible.

In addition, since the surface of the piercing roll can be more conveniently ground using the rotational force of the piercing roll, the grinding cost can be minimized.

1 is a perspective view of a psychological pipe piercing roll abrasive tool assembly of the present invention;
Figure 2 is a cross-sectional configuration diagram of Figure 1;
Figure 3 is an exploded perspective view of Figure 1;
4 is a conceptual diagram showing the grinding of two piercing rolls;
5 and 6 are step-by-step flow charts showing the operating state of the psychological pipe piercing roll polishing tool assembly of the present invention;
7 is a photograph showing a damaged piercing roll surface;
8 is a photograph showing a manual grinding operation of a piercing roll seated inside the rule housing by separating the upper part of the roll housing;
9 is a photograph showing the externally separated piercing roll.

Objects, other objects, features and advantages of the present invention below will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

Embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. The terms 'comprise' and/or 'comprising' used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific details have been prepared to more specifically describe the invention and aid understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known in describing the invention and are not greatly related to the invention are not described in order to prevent confusion in describing the present invention.

Hereinafter, a psychological pipe piercing roll polishing tool assembly according to the present invention will be described in detail with accompanying drawings.

1 is a perspective view of a seamless pipe piercing roll polishing tool assembly of the present invention, FIG. 2 is a cross-sectional configuration diagram of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 1, and FIG. 4 shows grinding of two piercing rolls. It is a conceptual diagram that represents

As shown in FIGS. 1 to 4, the present invention is intended to grind damage (foreign substance sticking, dents, cracks, dents) on the surface of the piercing roll caused by friction with the round bar when the round bar is pierced with a psychological pipe. In particular, it relates to a seamless pipe piercing roll grinding tool assembly 100 capable of grinding the surface of a piercing roll without separating the piercing roll from the roll housing 200b.

The psychological pipe piercing roll abrasive tool assembly 100 of the present invention replaces a plug (not shown) used when piercing a round bar transported by two piercing rolls 200 and is coupled to the mandrel rod 300 used

The psychological pipe piercing roll abrasive tool assembly 100 of the present invention enters the space SP between the two piercing rolls 200 rotating by the mandrel rod 300 to clean the surfaces of the two piercing rolls 200. Simultaneous polishing function. (shown in ② of FIG. 6)

At this time, the two piercing rolls 200 transfer the round bar by rolling, and the process of aligning the rotating shafts 200a of the piercing rolls 200 that are displaced from each other in a row must be preceded. shown at 5)

Therefore, the psychological pipe piercing roll polishing tool assembly 100 of the present invention polishes the damaged surface of the piercing roll 200 while aligning the two piercing rolls 200 in a row without separating them from the roll housing 200b. Thus, safety accidents can be prevented when disassembling the heavy piercing roll 200, and the surface can be polished while the piercing roll 200 is mounted on the roll housing 200b, which can shorten the polishing operation as much as possible. It works.

The psychological pipe piercing roll polishing tool assembly 100 of the present invention is largely composed of three parts, which are composed of a polishing part 10, a head part 20, and an adapter 30, as shown in FIG.

The polishing unit 10 enters the space SP between the two rotating piercing rolls 200 and serves to polish the damaged surface of the piercing rolls 200 .

At this time, as shown in FIG. 4, each of the piercing rolls 200 has a first taper having a smaller diameter with the first elevation surface portion 210 guiding the round bar and the first boundary surface 240 in the initial elevation portion 210. It consists of a portion 220 and a second tapered portion 230 whose diameter is relatively larger and smaller with the first tapered portion 220 and the second boundary surface 250 interposed therebetween.

Therefore, each of the piercing rolls 200 is formed from the first boundary surface 240 where the initial surface portion 210 and the first tapered portion 220 meet by the physical rotational contact with the round bar. The greatest surface damage occurs at the portion of the second boundary surface 250 where the second tapered portion 230 meets.

However, the polishing unit 10 of the present invention is made to grind from the initial elevation surface portion 210 of the piercing roll to the second tapered surface portion so that no surface grinding step is generated as a whole in a state where the two piercing rolls 200 are aligned side by side.

To this end, the polishing part 10 includes a first grinding part 11 partially corresponding to the initial surface part 210, a second grinding part 11 corresponding to the first boundary surface 240, and a first tapered part ( 220) corresponding to the third grinding part 13, the second boundary surface 250 corresponding to the fourth grinding part 14, and the second tapered part 230 partially corresponding to the fifth grinding part 15 may consist of

The polishing unit 10 maintains thermal stability and abrasion resistance up to 1370 ° C and generates little grinding heat, so it is formed of CBN (Cubic Boron Nitride, cubic boron nitride) abrasive grains, which are superabrasive raw materials that have very little effect on the workpiece due to heat generation. It is desirable that

In addition, the binder of the polishing unit 10 may be made of any one of Resinoid (B), Metal (M), Vitrified (V), and Electrodeposition (P), and has an average particle diameter of 149 μm and a hexagonal crystal at 1600 ° C. Because it is converted to boron nitride (hexagonal boron nitride), it has a characteristic that the effect of the workpiece material due to heat generation is very small because the grinding heat generation is low.

The head part 20 is coupled to one side of the polishing part 10 and has a relatively smaller diameter than the polishing part 10 .

Through this, the head part 20 guides the polishing part 10 to enter the space part SP between the piercing rolls 200, and also the support shaft so that the polishing tool assembly 100 can be maintained horizontally. It serves to connect 400.

To this end, as shown in FIG. 2, a support shaft 400 for supporting the free end of the abrasive tool assembly 100 rotating by physical contact with the piercing roll 200 is inserted into the front end of the head unit 20. For this purpose, a center groove 21 may be further formed.

Here, the support shaft 400 has the same function as a so-called tailstock support shaft used in a lathe.

At this time, a friction pad 211 made of Teflon is inserted into the center groove 21 to generate frictional force with the support shaft 400, and the number of rotations of the abrasive tool assembly 100 that rotates simultaneously with the piercing roll 200 is reduced. configured to reduce it.

Accordingly, when the support shaft 400 is strongly adhered to the center groove 21, the rotational force of the polishing tool assembly 100 is reduced by the friction pad 211, so that the rotating piercing roll 200 and the polishing tool assembly ( 100), the damaged surface of the piercing roll 200 in contact with the polishing unit 10 is ground.

In addition, the adapter 30 has a structure having a connection shaft 31 coupled to the other side of the polishing part 10 and connected to the mandrel rod 300.

At this time, the adapter 30 has a structure having a coupling shaft 32 coupled to the head portion 20 across the inner center of the polishing portion 10 on one side, as shown in FIGS. 2 and 3 .

Accordingly, the adapter 30 is provided with a structure that can be integrally connected to the polishing unit 10 together with the head unit 20 .

In addition, two, three or four wing parts 321 are formed on the outer circumferential surface of the coupling shaft 32 to restrain the polishing unit 10 and increase binding force.

At this time, the polishing part 10 also has a through hole 10a corresponding to the coupling shaft 32 and the wing part 321, so that the binding force with the adapter 30 can be increased.

In addition, when the polishing unit 10 contacts the surface of the piercing roll 200 and rotates, the rotational force through the wing unit 321 causes the adapter 30 and the head unit 20 to rotate together.

Therefore, when the support shaft 400 presses the head part 20, this eventually reduces the rotational speed of the entire seamless pipe piercing roll polishing tool assembly 100 including the polishing part 10.

In addition, the polishing part 10 is easily separated from the coupling shaft 32 when the head unit 20 coupled with the coupling shaft 32 of the adapter 30 is separated, so that it can be easily replaced when worn.

Hereinafter, the operation of the psychological pipe piercing roll abrasive tool assembly according to the present invention will be briefly described.

5 and 6 are step-by-step flow charts showing the operating state of the psychological pipe piercing roll abrasive tool assembly of the present invention.

① First, a pair of piercing rolls 200 for rotating and transferring a round bar by rolling are arranged to be offset from each other, and the rotating shafts 200a of the piercing rolls 200 are aligned in order to simultaneously polish each of the piercing rolls 200. sort them side by side

② Then, after separating the plug (not shown) for piercing the round rod from the mandrel rod 300, the connecting shaft 31 of the adapter 30 is coupled to the front end of the mandrel rod 300.

③ After placing the support shaft 400 across the space between the piercing rolls 200 (SP), it adheres closely to the center groove 21 at the front end of the head unit 20 so that the abrasive tool assembly 100 is horizontally keep in equilibrium.

④ After that, each piercing roll 200 is rotated.

⑤ Then, by advancing the mandrel rod 300 to one side, the polishing part 10 of the polishing tool assembly 100 meets the initial elevation part 210 of the piercing roll 200 together with the first tapered part 220. It proceeds from the boundary surface 240 to the second boundary surface where the first tapered portion 220 and the second tapered portion meet.

Then, foreign matter formed on the surface of the piercing roll 200 in contact with the first, second, third, fourth, and fifth grinding parts 11, 12, 13, 14, 15 of the polishing part 10, dents, cracks, Scratches and the like are removed by grinding.

At this time, in the process of grinding, the hydraulic cylinder (not shown) is connected to the end of the support shaft 400 and the abrasive tool assembly 100 is moved in the forward/backward direction to achieve more efficient grinding (prevention of temperature rise due to friction). (Example: 30 seconds grinding → 2 seconds rest time → 30 seconds → repeat)

As described above, the seamless pipe piercing roll polishing tool assembly of the present invention is used to grind the surface of the piercing roll used when piercing the psychological pipe, but is used in the elongation rolling process of the psychological pipe other than that. Of course, it can also be used for grinding the surface of a three-roll type rolling roller.

Since the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various equivalents that can replace them at the time of this application It should be understood that there may be variations and examples.

10: polishing part 10a: through groove 11: first grinding part
12: second grinding part 13: third grinding part
14: 4th grinding part 15: 5th grinding part
20: head part 21: center groove 211: friction pad
30: adapter 31: connecting shaft 32: coupling shaft
321: wing part
100: psychological pipe piercing roll abrasive tool assembly
200: piercing roll 200a: rotary shaft 200b: roll housing
` 210: initial elevation part 220: first taper part
230: second tapered portion 240: first boundary surface
250: second boundary surface
300: Mendral Road
400: support shaft SP: space

Claims (6)

In the seamless pipe piercing roll polishing tool assembly for grinding the surface damage of the piercing roll caused by friction with the round bar when piercing the round bar with the seamless pipe,
A polishing unit 10 that enters the space between the two rotating piercing rolls 200 and polishes the damaged surface of the piercing roll 200;
a head part 20 coupled to one side of the polishing part 10 and having a relatively smaller diameter than the polishing part 10; and
An adapter 30 coupled to the other side of the polishing part 10 and having a connecting shaft 31 connected to the mandrel rod 300;
At the front end of the head part 20, a center groove 21 is further provided to insert a support shaft 400 for supporting the free end of the abrasive tool assembly 100 rotating by contact with the piercing roll 200. A psychological pipe piercing roll abrasive tool assembly, characterized in that formed.
According to claim 1,
The adapter 30 further includes a coupling shaft 32 coupled to the head portion 20 across the inner center of the polishing portion 10 on one side,
Seamless pipe piercing roll abrasive tool assembly, characterized in that two, three or four wing parts 321 are further formed on the outer circumferential surface of the coupling shaft 32 to restrain the polishing unit 10 and increase the binding force.
According to claim 1,
Each of the piercing rolls 200 includes an initial surface portion 210 for guiding a round bar, a first tapered portion 220 having a smaller diameter with a first boundary surface 240 interposed in the initial surface portion 210, and It consists of a second tapered portion 230 having a relatively larger diameter with the first tapered portion 220 and the second boundary surface 250 interposed therebetween,
The polishing unit 10 includes a first grinding unit 11 partially corresponding to the initial elevation surface 210 as a whole and a first grinding unit 11 corresponding to the first boundary surface 240 in a state in which the two piercing rolls 200 are aligned side by side. The second grinding part 11, the third grinding part 13 corresponding to the first taper part 220, the fourth grinding part 14 corresponding to the second boundary surface 250, and the second taper part ( 230), the seamless pipe piercing roll polishing tool assembly, characterized in that composed of a fifth grinding portion (15) corresponding in part.
delete According to claim 1,
A friction pad 211 made of Teflon is inserted into the center groove 21 to generate frictional force with the support shaft 400 to reduce the number of rotations of the abrasive tool assembly 100 that rotates simultaneously with the piercing roll 200. A psychological pipe piercing roll abrasive tool assembly, characterized in that configured to be able to.
According to claim 1,
The polishing unit 10 is formed by molding CBN (Cubic Boron Nitride, cubic boron nitride) abrasive grains, which are superabrasive grain raw materials that maintain thermal stability up to 1370 ° C and generate little grinding heat and have very little effect on the workpiece due to heat generation. A deep pipe piercing roll abrasive tool assembly.

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