KR20060131392A - Polishing bar of an apparatus for polishing an inside diameter and a method using the same - Google Patents

Abstract

A polishing rod of a pipe inner diameter polishing device and a method thereof are provided to effectively remove weld beads and foreign matter on the inner diameter of a pipe. A polishing rod(100) of a pipe inner diameter polishing device(IA) fitted in a pipe(P) to remove weld beads and foreign matters comprises a first pipe member supplied with air inside to discharge the air to the outside; a second pipe member combined with the first pipe member at the inner diameter to be supplied with a polishing fluid inside; an expansible member attached on the outer diameter surface of the second pipe member to be expanded according to air pressure; and a polishing material attached on the surface of the expansible member to be expanded together with the expansible member.

Description

Polishing rod of pipe internal polishing device and pipe internal polishing method using the same {POLISHING BAR OF AN APPARATUS FOR POLISHING AN INSIDE DIAMETER AND A METHOD USING THE SAME}

1 is a front view of a pipe internal polishing apparatus according to a preferred embodiment of the present invention;

FIG. 2 is a front and partial enlarged view of the polishing rod shown in FIG. 2; FIG.

3 is a cross-sectional view taken along the line A-A shown in FIG.

4 is a cross-sectional view taken along line B-B shown in FIG.

Figure 5 is a flow chart of the inner diameter polishing method of the pipe using the polishing rod shown in FIG.

6 is a reference diagram showing the roughness of the inner diameter of the pipe polished by the polishing rod according to a preferred embodiment of the present invention;

7 is an enlarged photograph of an inner diameter of a pipe polished by a polishing rod according to a preferred embodiment of the present invention;

8 is a reference diagram showing the roughness of the inner diameter of the pipe polished by a polishing rod according to the prior art; And

9 is an enlarged photograph of an inner diameter of a pipe polished by a polishing rod according to the related art.

Explanation of symbols on the main parts of the drawings

P: Pipe IA: Internal Grinding Device

AP: air PW: polishing liquid

100: polishing rod 110: first pipe member

112: first hole 120: second pipe member

122: second hole 124: third hole

130: stretching member 140: abrasive

The present invention relates to a pipe internal polishing device, and more particularly, to a polishing rod of a pipe internal polishing device for polishing an internal diameter of a pipe such as a stainless steel pipe used in semiconductor tubes, food and beverage pipes, and sanitary pipes, and a pipe internal polishing device using the same. It is about a method.

Generally, a pipe is manufactured using the strip | belt-shaped board | plate material which has a predetermined width as a raw material.

That is, the pipe is a first step of continuously supplying a strip-shaped plate; A second step of winding the plate material supplied through the first step to have a circular cross section as a plurality of rollers; A third process of forming a circle through the second process and continuously welding the portions where both ends contact each other by a method such as argon (Ar) welding; A fourth step of compressing and treating the weld bead protruding from the inner and outer peripheral surfaces of the welded portion through the third step; And a fifth step of cutting the pipe passed through the fourth step into a predetermined length.

In the pipe manufactured as described above, even if a welding bead formed on the outer circumferential surface of the pipe during the welding process is compressed into a bead processing machine, the pipe cannot be processed smoothly. Since the outer circumferential surface of the pipe is exposed to the outside, polishing is very difficult. The weld bead on the outer circumferential surface can be polished smoothly and smoothly, while the inner circumferential surface of the pipe is concealed inside, so that the polishing process is not easy, and the longer the length of the pipe, the more difficult the polishing of the inner diameter is.

By the way, the pipe used as a sanitary pipe for transporting food materials in food processing companies, etc. should be that the inner diameter is processed very smoothly, more preferably should be the inner diameter plating with a plating material that is not harmful to the human body, as described above Naturally, it is impossible to use the sanitary pipe without removing the beads generated during welding on the inner circumferential surface of the manufactured pipe, or even if the weld beads of the inner diameter of the pipe are crimped with the bead processor, the compressed beads are not processed smoothly. Since both parts protrude from the inner diameter of the pipe with fine unevenness, the use as a sanitary pipe is inadequate, and furthermore, the inner surface of the pipe cannot be sanitized without polishing or grinding. For this reason, pipes which are not polished and sanitary plated with smooth and smooth roughness on the inner surface of the pipe cannot be used as sanitary pipes.

As a typical representative method for meeting this demand, Korean Utility Model Model No. 20-0258105 filed by Daemyung Metal Industry Co., Ltd., dated Dec. 7, 2001 It has been registered. This had the effect of being able to cleanly remove foreign substances and inner beads attached to the inner surface of the pipe. However, the conventional utility model is to scratch the pipe inner diameter due to the strong contact of the abrasives by installing the abrasives, which are driven by the spring force, in a plurality of receiving grooves formed in the abrasive rods in order to effectively achieve the above-described effect. ) There was a concern such as bending of pipe due to occurrence or strong pressure.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to provide a polishing rod of the pipe internal polishing apparatus that can more effectively remove the welding bead and foreign matter of the pipe inner diameter and provides a pipe internal polishing method using the same. There is.

In order to achieve the above objects, the present invention

A polishing rod of a pipe internal polishing device that is inserted into an internal diameter of a pipe to remove welding beads and foreign matter,

A first pipe member through which air is supplied and the air is discharged to the outside;

A second pipe member having the first pipe member coupled to the inner diameter and supplied with a polishing liquid;

An expandable member that is expandably attached to an outer diameter surface of the second pipe member and expands according to the blowing pressure of the air; And

Abrasives attached to the surface of the stretchable member and expanded together with the stretchable member

To provide an abrasive rod of the inner diameter polishing apparatus for pipes, characterized in that it comprises a.

Preferably, the elastic member and the abrasive are provided in plurality and are disposed on the outer diameter surface of the second tube member to be spaced apart from each other at a predetermined interval.

Preferably, at least one first hole and a second hole are formed in a contact portion of the first pipe member and the second pipe member so that the air is blown out to the elastic member to expand the abrasive.

Preferably, at least one third hole penetrates the outer diameter of the second pipe member so as to be positioned between the second holes.

Preferably, the polishing rod is installed horizontally with respect to the internal polishing device.

Preferably, one end of the polishing rod is inclined with respect to the other end so that the polishing liquid can be repeatedly used.

In the inner diameter polishing method of a pipe using an abrasive rod according to the present invention,

A first step of rotatably installing the pipe in the internal polishing apparatus;

A second step of inputting and transporting the polishing rod to the inner diameter of the pipe of the first step;

A third step of supplying air to the inside of the first pipe member of the polishing rod, wherein the air pressure is supplied to the outside of the first pipe member to expand the abrasive; And

A fourth step of supplying the polishing liquid into the second pipe member of the polishing rod and supplying the polishing liquid to the abrasive

To provide a method for polishing the inner diameter of the pipe comprising a.

Preferably, the method further includes a fifth step of allowing one end of the polishing rod to be inclined with respect to the other end to reuse the abrasive in the second pipe member.

The objects and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

1 is an enlarged view of a view and a part shown in the front of a pipe internal polishing apparatus according to a preferred embodiment of the present invention. FIG. 2 is a front view showing the polishing rod shown in FIG. 1. 3 is a cross-sectional view taken along the line A-A shown in Figure 2, Figure 4 is a cross-sectional view taken along the line B-B shown in FIG.

As shown in FIGS. 1 to 4, the first pipe member 110 is a polishing rod 100 of the pipe internal polishing apparatus IA, which is rotatably fitted to the inner diameter of the pipe P to remove welding beads and foreign substances. ) Includes a second pipe member 120 provided therein, and the elastic member 130 and the abrasive 140 are installed at the outer diameter of the second pipe member 120. Although not shown in the drawings, an air supply device (not shown) is connected to the first pipe member 110, and a polishing liquid supply device (not shown) is connected to the second pipe member 120.

Air AP is supplied inside the first pipe member 110, and the air is ejected to the outside again.

In the second pipe member 120, the first pipe member 110 is coupled to the inner diameter, and the polishing liquid PW is supplied therein. That is, the second pipe member 120 is formed smaller than the inner diameter of the first pipe member 120.

At least one or more air AP of the first pipe member 110 may be ejected to the stretchable member 130 and the abrasive 140 at the contact portion between the first pipe member 110 and the second pipe member 120. The first hole 112 and the second hole 122 are respectively formed through. That is, when the first pipe member 110 and the second pipe member 120 are coupled to each other, the first hole 112 and the second hole 122 is in a state of coinciding with each other to be the discharge passage of the air.

The elastic member 130 is formed of the same material as the expandable rubber tube. The elastic member 130 is coupled to the outer diameter of the second tube member 120 and is expanded by the pressure of the air discharged through the second hole 122 of the second tube member 120. At least one elastic member 130 is provided to be spaced apart from each other with a predetermined interval.

The abrasive 140 is expandably attached to the outer circumferential surface of the stretchable member 130. Both ends of the attached abrasive 140 are fixed to the outer diameter of the second pipe member 120 by a fixing means T such as a tape. Thereafter, when the air in the first pipe member 110 is ejected through the first hole 112 of the first pipe member 110 and the second hole 122 of the second pipe member 120, the elastic member 130 is disposed. Is inflated with. In this state, the polishing liquid PW in the second pipe member 110 is directly supplied toward the stretching member 130. For this reason, since the abrasive 140 and the expansion | contraction member 130 operate | move in the surface contact with the pipe P inner diameter whole, there exists a possibility that operation efficiency may fall.

In order to effectively prevent this, the abrasive 140 may be installed on the outer circumferential surface of the second pipe member 120 over several places at predetermined intervals. Preferably, at least one third hole 124 penetrates through one side of the second pipe member 120. For this reason, unlike the foregoing, the abrasive 140 may be polished in a state of being partially in contact with the inner diameter of the pipe P, thereby improving work efficiency. In particular, the third hole 124 penetrates through a portion where the abrasive 140 is not installed. As a result, the polishing liquid PW may be supplied through the third hole 124 to which the abrasive 140 is not directly bonded, thereby performing a more effective polishing liquid PW supply function.

Polishing rod 100 is installed horizontally with respect to the internal polishing apparatus (IA). At this time, the reuse of the polishing liquid PW located in the second pipe member 120 of the polishing rod 100 may be a force. Therefore, preferably, one end of the polishing rod 100 is installed to have a predetermined slope with respect to the other end so that the polishing liquid PW can be repeatedly used. When the polishing rod 100 is inclined as described above, the polishing liquid PW is collected in a reservoir not shown and reused.

FIG. 5 is a view illustrating an inner diameter polishing method of the pipe using the polishing rod shown in FIG. 2 in order.

1 to 5, the pipe P is rotatably installed in the internal polishing apparatus IA (S1).

The polishing rod 100 is introduced and transferred into the inside of the pipe P installed as described above (S2).

The air AP is supplied from the above-described air supply device (not shown) to the inside of the first pipe member 110 of the polishing rod 100. The air AP passes through the first hole 112 of the first pipe member 110 and the second hole 122 of the second pipe member 120 in turn, and then is coupled to the second pipe member 120. It is ejected in the direction of the stretchable member 130 and the abrasive 140. By doing so, the stretchable member 130 and the abrasive 140 are expanded outward from the outer diameter of the second pipe member 120 (S3).

The polishing liquid PW is supplied from the polishing liquid supply device (not shown) to the inside of the second pipe member 120 of the polishing rod 100. The polishing liquid PW thus supplied is supplied to the abrasive 140 coupled to the second pipe member 120. In other words, the second pipe member 120 is discharged to the outside of the second pipe member 120 through the third hole 124 penetrated through the second pipe member 120 and is supplied to the abrasive 140 (S4).

One end of the polishing rod 100 is moved high or low to be inclined with respect to the other end by a tilting device (not shown). As a result, the polishing liquid PW flowing into the first pipe member 120 of the polishing rod 100 flows from a high position to a low position and is collected in a separate storage space (not shown). The collected polishing liquid PW is repeatedly reused by the method described above (S5).

For reference, Figure 6 is a reference diagram showing the roughness of the inner diameter of the pipe polished by the polishing rod according to a preferred embodiment of the present invention. Figure 7 is a photograph showing an enlarged microscope image of the inner diameter surface of the pipe polished by a polishing rod according to a preferred embodiment of the present invention. 8 is a reference diagram showing the roughness of the inner diameter of the pipe polished by a polishing rod according to the prior art. 9 is an enlarged photograph of a microscope showing an inner diameter surface of a pipe polished by a polishing rod according to the related art.

6 and 7, when the inner diameter of the pipe is polished by the polishing rod according to the present invention, the surface state is inspected by using an illuminometer and the surface state is photographed by a microscope. Roughness Ra at this time is 2.9 micrometers (microinches). On the contrary, referring to FIG. 8, when the inner diameter of the pipe was polished by the polishing rod according to the prior art, the surface state thereof was inspected using an illuminometer, and the roughness Ra at this time was 6.5 μin (micro inch). to be. The comparison of roughness Ra as described above shows that the lower the value, the better the polishing state of the surface of the pipe P. In addition, it can be seen from the micrograph that the polishing state of the surface of the pipe P is good when the polishing rod of the present invention is used. As a result, it can be seen that the polishing state of the pipe P using the polishing rod 100 according to the present invention is much better than when using the polishing rod according to the prior art.

As mentioned above, according to the polishing rod of the pipe internal polishing apparatus according to the embodiment of the present invention and the pipe internal polishing method using the same, air is supplied to the inside of the first pipe member constituting the polishing rod, and the first In addition to supplying the polishing liquid to the inside of the second pipe member in which the pipe member is installed, and by installing the abrasive on the outer circumferential surface of the second pipe member, when the polishing operation is performed after the polishing rod is inserted into the inner diameter of the pipe, The present invention is capable of effectively removing foreign substances, welding beads, etc. in a pipe because the polishing operation is performed in the expanded state and the abrasive member coupled to the second pipe member by the air pressure of the first pipe member.

In addition, the present invention, by installing the abrasive on the outer peripheral surface of the second pipe member at a predetermined interval spaced apart at several places, the polishing operation is performed in a state in which the abrasive is partially contacted with the polishing liquid more smoothly supplied instead of contacting the pipe inner diameter as a whole. Therefore, the invention can greatly improve the polishing state of the pipe inner diameter.

In the above, the present invention has been described in detail with reference to the above-described embodiments, but the present invention is not limited thereto, and those skilled in the art may change or improve the technology within the scope of ordinary knowledge.

Claims (8)

A polishing rod of a pipe internal polishing device that is inserted into an internal diameter of a pipe to remove welding beads and foreign matter, A first pipe member through which air is supplied and the air is discharged to the outside; A second pipe member having the first pipe member coupled to the inner diameter and supplied with a polishing liquid; An expandable member expandably attached to an outer diameter surface of the second pipe member and expanded according to the pressure of the air; And Abrasives attached to the surface of the stretchable member and expanded together with the stretchable member Polishing rods of the inner diameter of the pipe polishing apparatus comprising a. The polishing rod of the inner polishing apparatus according to claim 1, wherein the elastic member and the abrasive are provided in plural and are disposed on the outer diameter surface of the second tube member so as to be spaced apart from each other at a predetermined interval. The method of claim 1, wherein at least one of the first hole and the second hole is formed through the contact portion of the first tube member and the second tube member so that the air is blown out to the elastic member to expand the abrasive. A polishing rod of a pipe internal polishing apparatus characterized by the above-mentioned. 4. The polishing rod of claim 3, wherein at least one third hole penetrates the outer diameter of the second pipe member so as to be positioned between the second holes. 5. The abrasive rod of any one of claims 1 to 4, wherein the polishing rod is horizontally installed with respect to the internal polishing apparatus. 5. The abrasive rod of any one of claims 1 to 4, wherein one end of the polishing rod is inclined with respect to the other end to repeatedly use the polishing liquid. In the pipe internal polishing method using a polishing rod according to claim 1, A first step of rotatably installing the pipe in the internal polishing apparatus; A second step of inputting and transporting the polishing rod to the inner diameter of the pipe of the first step; A third step of supplying air to the inside of the first pipe member of the polishing rod, wherein the air is supplied to the outside of the first pipe member to expand and contract the abrasive; And A fourth step of supplying the polishing liquid into the second pipe member of the polishing rod and supplying the polishing liquid to the abrasive Inner diameter polishing method comprising a pipe. 8. The method of claim 7, further comprising a fifth step in which one end of the polishing rod is inclined with respect to the other end to reuse the abrasive in the second pipe member.

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