JPH07171712A - Broach for deburring inside face of pipe and how to use it - Google Patents

Abstract

PURPOSE:To provide a broach facilitating the work of deburing the inside face of a bent pipe such as a bend of cast iron, as preparation for applying work such as painting to the inside face, and efficiently deburr the inside face of the bent pipe by means of the broach. CONSTITUTION:With this deburring broach, cutting tolls 1 are provided and projected from the overall periphery of the outer peripheral side surface, and respective sector-bodies 2 constituting of disc bodies of various diameters, the center part of each of which is opened and each of which is radially divided into plural parts, are engagingly locked around the sector-body holder 3, spacing a small flexible distance between the sector-bodies and the sector-body holder. The cutting tools 1 on the respective sector-bodies are arranged on a nearly elliptic spherical surface having the minor axis equal to the inside diameter of the pipe, and overlapped in parallel. Further, while the direction of a draw rope of the broach is nearly in conformity with the pipe-axis at the outlet part of the fixed bent pipe, the broach is slid from the inlet to the outlet of the pipe by drawing the rope.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broach for easily scraping and removing projections such as burrs on the inner surface of pipes such as cast iron pipes, especially bent pipes such as bends, and the like. It relates to a method of using the broach so that protrusions such as burrs on the inner surface of the curved pipe can be scraped off particularly efficiently.

[0002]

BACKGROUND ART Cast iron pipes used for water pipes or the like are usually coated or resin-coated on the inner surface in order to improve the contact resistance and maintain the quality of water and other liquids passing through them. However, in order to apply high-quality coating or resin processing, as a pretreatment, protrusions such as burrs on the inner surface of the pipe that were formed at the time of casting were scraped off as cleanly as possible and removed to smooth the inner surface. It is necessary to finish the surface.
In the past, a method of using a grinder was used to remove the protrusions such as burrs, but it is difficult to deal with burrs on the inner surface of the curved pipe, and the work is extremely inefficient. .

Therefore, the inventor of the present application has a spherical shape having a diameter substantially equal to the inner diameter of the pipe, which enables easy and efficient removal of burrs on the inner surface of the straight pipe as well as the curved pipe. We have developed a broach that is a body and a cutting blade provided over almost the entire surface of the spherical body, and a deburring machine using it (see Japanese Patent Application No. 4-208364), and has great effects. However, if the broach is a spherical body in the form of a stack of discs with the cutting edge at the periphery, the discs are always orthogonal to the tube axis on the side. It does not always pass through the pipe in a slidable manner, but sometimes it may become a little oblique, and at that time the cutting blade at the peripheral edge of the disc body may come off from a part of the inner surface of the pipe, sometimes it is a curved pipe When removing the burr on the inner surface of the There is a case.

[0004]

DISCLOSURE OF THE INVENTION The present invention improves a brooch in the form of a spherical body by superimposing the above-mentioned disc body having a cutting edge at the peripheral edge portion, and improves the broach in the case of a curved pipe and the inner surface of a cheek. The purpose is to obtain a broach that enables accurate removal of burrs and other protrusions without leaving any residue, and to obtain a method for using the improved broach to deburr the inner surface of pipes very efficiently. And

[0005]

The broach according to the present invention has a cutting blade (1) continuously protruding from the outer peripheral side surface of a plurality of various diameters over the entire circumference and at the central portion. Each disk (2) is formed by dividing each disk having the opening into a plurality of pieces in the radial direction, and a set screw (4) and an elastic member are provided around the disk holder (3). Body (5)
Through the inner peripheral side surface of each sector (2) and the sector holder (3) with a retractable gap of a small width, while cutting the outer peripheral side of each sector (2). The blades (1) are superposed in parallel in such a manner that the blades (1) are arranged on a substantially elliptical spherical surface having a short diameter substantially equal to the inner diameter of the pipe (6).

The number of fan-shaped bodies to be superposed in parallel may be four as shown in the following examples, or three, five or six.
It may be about a sheet. The number of disks to be divided may be three as in the following embodiment, but two or four,
It may be about five. Further, the number of setscrews and elastic bodies for locking the respective fan-shaped bodies around the fan-shaped body holder while allowing the fan-shaped bodies to be extended and contracted is one elastic screw with one set screw for each fan-shaped body as in the embodiments described below. The number may be two, but it goes without saying that it may be increased or decreased as appropriate, and the elastic body may be a coil spring as in the following embodiment, but a leaf spring or elastic rubber may be used. May be.

In the brooch constructed as described above, a rope is tied to the tip of the broach, the rope is passed through a pipe having a diameter substantially equal to the minor diameter of the broach, and the broach is pulled from the outlet of the pipe to the inside of the pipe. When the broach is pulled through the rope, it moves slidably on the inner surface of the pipe when it is passed through, but when it slidably passes through the curved part of the pipe, the overall shape is elliptical and each fan-shaped. The space between the body and the fan-shaped holder can be expanded and contracted so that the passage is easy and easy, and each fan-shaped body does not cross at right angles to the axis of the curved pipe and is slightly inclined. Even if the cutting blades protruding through one outer peripheral side of the fan-shaped body with a large radius in the central part so as to pass through in an alternating manner come off from a part of the inner surface of the pipe, the overall shape is It has an elliptical shape and is next to the center Since the radii of each sector are similar to each other, the inside of the pipe is complemented by a cutting blade protruding on the outer peripheral surface of the sector with a similar radius immediately following. The protrusions such as burrs on a part of the surface are scraped off, and the uncut portion is not generated.

According to a second aspect of the present invention, in the broach according to the first aspect, the cutting blade (1) is formed in such a manner that the cutting blade (1) appropriately crosses obliquely on a side surface with respect to a long axis of the substantially elliptical spherical surface. It is provided on the outer peripheral side surface.

In such a broach, when the broach is pulled by a rope to move forward in the pipe, the cutting blade comes into contact with protrusions such as burrs in the pipe in an oblique manner instead of in an orthogonal manner, so that the broach is clean. By making it possible to scrape off protrusions such as burrs on the cut surface with a smaller force, deburring can be performed neatly while further reducing the tensile force of the rope.

A third aspect of the present invention relates to the efficient use of the above-mentioned broach, and relates to a broach in which the cutting blade (1) is arranged on a substantially elliptical spherical surface having a minor diameter substantially equal to the inner diameter of the pipe (6). Then, while making the pulling direction at the outlet portion of the pulling rope (7) substantially coincide with the pipe axis of the outlet portion of the pipe fixed at a fixed position and direction, from the pipe inlet through the pulling of the rope. This is a method of passing the inside of the pipe to the outlet while sliding the inner surface thereof.

According to such a method, the angle or inclination of the broach axis which slides on the inner surfaces of the curved tube portion and the straight tube portion with respect to the tube axis can be easily made constant, and the burr produced by the cutting blade with a certain degree and quality can be obtained. It becomes easier to scrape off protrusions such as, and it is possible to reduce wasteful work such as a reshaping operation.

[0012]

[Embodiment 1] As shown in FIGS. 1, 2, 3, 4, and 5, a fan-like shape in which a thick-walled pipe is erected at the central opening of a pipe flange-like disc having a relatively small diameter. Body holder (3)
A groove is continuously formed on the outer peripheral side surface around the entire circumference of the groove, and one side wall of the groove is formed as a cutting blade (1) having an acute cross section, and the cutting blade projects outward. And circular discs with a circular opening in the center of the flat surface, and two discs made of tool steel and having a diameter approximately equal to the diameter of the pipe to be deburred. Each of the two disk bodies having a slightly smaller diameter is divided into three parts in the radial direction, and a stepped hole for a set screw (4) is formed through the center of each of the divided parts. In addition, for each fan-shaped body (2) in which spring holes for inserting a coil spring as an elastic body (5) are bored on the inner peripheral portions on both sides of the hole, first, the diameter of the inside of the fan-shaped body is large. Insert the coil spring into the spring hole while arranging the other one in the shape of the disk that is almost the original shape. While abutting one end on the fan-shaped holder (3), a set screw is inserted into the stepped hole while keeping a small gap between the fan-shaped holder and the fan-shaped holder (3). It is screwed into 3) to determine the maximum value of the width of the space, while the width of the space is made elastic by the elasticity of the coil spring, and is locked around the fan-shaped body holder.

Then, three fan-shaped bodies having substantially the same radius as the above-mentioned fan-shaped bodies are arranged at positions where the respective positions around the fan-shaped body holders are shifted by 30 ° from the positions around the fan-shaped body holders of the respective fan-shaped bodies. With the same configuration as described above, the fan-shaped body is held adjacent to the fan-shaped body adjacent to each of the fan-shaped bodies, with a narrow space between the fan-shaped body holder and the fan-shaped body holder. , The three fan-shaped bodies each having a radius slightly smaller than those of the fan-shaped bodies are adjacent to the front and rear of each of the two rows of fan-shaped bodies described above, and the respective positions around the fan-shaped body holders are described above. The two rows of adjacent fan-shaped bodies are offset by 30 ° from each other in opposite directions, and the fan-shaped body holders are arranged around the fan-shaped body holders with the same configuration as described above, with a small and expandable interval therebetween. Stop. Then, as shown by the one-dot chain lines in the upper and lower parts of the center of FIG. 1, the cutting blades (1) provided on the outer peripheral side surfaces of the four rows of fan-shaped bodies are arranged side by side in a manner arranged on a substantially elliptical spherical surface. Polymerize. It should be noted that the position of the fan-shaped body of each row around the fan-shaped body holder is shifted by 30 ° from that of the fan-shaped body of the adjacent row is to install each fan-shaped body of each row with a small space from the fan-shaped body holder. This is for complementing the cuts of the cutting blades of the outer peripheral portion corresponding to the narrow spaces between the fan-shaped bodies of each row, which are caused by the above, by the cutting blades of the fan-shaped bodies of the adjacent rows.

Then, the outer peripheral edge of the fan-shaped body of each row is arranged adjacent to the rear surface of the flange-like disc body portion of the fan-shaped body holder in which the cutting blades on the outer peripheral side surface portion are arranged on a substantially elliptical spherical surface. Similarly, the long shaft bolt (8) is inserted into the hollow shaft portion of the chamfered pipe flange type disc body rear guide (9), and the fan nut (10) is inserted from the front. ) And tighten the above components to integrate them, and then insert the front guide (11) similar to the rear guide into the front part of the long shaft bolt while fitting the front guide (11) adjacent to the nut. At the same time, a nut (13) for a long shaft bolt, in which a mounting hole (12) for a pull rope (7) is provided at the tip of the long shaft bolt, is screwed and tightened to form a brooch for deburring the inner surface of the pipe. . The rear guide (9) and the front guide (11) are as shown by the two-dot chain line in FIG.
When the broach is used for deburring the inner surface of the pipe, it comes into contact with the inner surface of the pipe (9) when the axis of the broach tilts with respect to the axis of the pipe. The purpose of this is to prevent poor contact with the inner surface of the pipe, and to ensure smoother and more accurate deburring work. As a matter of course, those guides may be replaced with ones having an appropriate diameter so that the inclination of the axis of the broach with respect to the axis of the tube can be adjusted and limited to an appropriate maximum angle.

Further, as shown in FIG. 1, the cutting blade (1) protrudingly provided on the outer peripheral side surface of each sector (2) is a side surface with respect to the major axis of the elliptical spherical surface on which the cutting blade is arranged. Although it is not orthogonal, it is formed in a slightly oblique shape, as described above, so that each cutting blade (1) obliquely hits protrusions such as burrs on the pipe inner surface as the broach advances. The purpose is to further reduce the force required to scrape off the projections and to make the scraped surface smoother.

[0016]

Second Embodiment As shown in FIG. 6, the turntable (1
4) The S-shaped curved pipe (6) is fixed on the upper side by a clamp (15) in an appropriate position and direction, and the rotation position of the turntable is fixed on the spot, and then the pipe shaft of the outlet portion of the curved pipe is fixed. In addition, one end is connected to a rope pulling machine such as a hydraulic machine and the other end is connected to the tip of the brooch, and the pulling direction at the curved pipe outlet part of the pulling rope (7) can be moved across the rope. The rope guide (16) is moved to an appropriate position so that the ropes are pulled substantially by the rope pulling machine while making the ropes substantially coincide with each other, and the ropes are cut on a substantially elliptical spherical surface having a minor diameter substantially equal to the inner diameter of the curved pipe. A curve for the broach of the above-mentioned embodiment in which the inner surface of the tube is slidably moved from the inlet to the outlet of the curved tube by using the brooch (20) of the above-mentioned embodiment in which the blade (1) is arranged. This is a method for deburring the inner surface of the pipe. Incidentally, the chain line in FIG. 6 similarly shows the usage for deburring of the above-mentioned embodiment on the inner surface of the 90 ° bend. If such a method is adopted, wasteful work can be eliminated and the efficiency of deburring work can be improved as described above.

[0017]

EFFECTS OF THE INVENTION The broach of the present invention has a simple structure and is easy to manufacture, and the operation for removing a predetermined burr is very easy by pulling the brooch with a rope and passing it through the pipe from its inlet to its outlet. This is a low cost compared to the conventional deburring work, and the work can be performed efficiently with easy operation, and the finished state of the inner surface of the pipe with the deburring is extremely smooth, It has a great effect on the progress of processing technology such as coating on the inner surface of cast iron pipes with parts and resin processing.

According to the second aspect of the present invention, it is possible to reduce the pulling force of the brooch during the deburring operation by the broach and to remove the protrusion such as the burr on a more clean surface. Further, claim 3
According to the method of use of the invention of claim 1, the deburring work on the inner surface of the curved pipe by the broach of the present invention can be performed very efficiently.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an embodiment of the present invention.

2 is a rear view of the embodiment of FIG.

FIG. 3 is a front view of the embodiment shown in FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an explanatory plan view of an example of how to use the broach of the present invention.

[Explanation of symbols]

 1 Cutting Blade 2 Fan Shape 3 Fan Shape Holder 4 Set Screw 5 Elastic Body 6 Tube 7 Pulling Rope 8 Long Shaft Bolt 9 Rear Guide 10 Nut for Fan Shape 11 Front Guide 13 Nut for Long Shaft Bolt 14 Turntable 15 Clamp 16 Rope Guide 20 brooch

Claims (3)

[Claims] 1. A disk body having a plurality of various diameters, in which a cutting blade (1) is continuously projected on the outer peripheral side surface over the entire circumference thereof and an opening is formed in the central portion of each disk body in the radial direction. Each fan-shaped body (2) is divided into a plurality of parts, and each fan-shaped body (2) is surrounded by the set screw (4) and the elastic body (5) around the fan-shaped body holder (3). Perimeter side and fan holder (3)
A substantially elliptical shape in which the cutting blade (1) on the outer peripheral side surface of each sector (2) has a minor axis substantially equal to the inner diameter of the tube (6), while being locked while being stretchable and appropriately spaced with a small width. A brooch for deburring the inner surface of the pipe, characterized in that the broaches are superposed in parallel in a manner arranged on a spherical surface. 2. The pipe according to claim 1, wherein the cutting blade (1) is provided on an outer peripheral side surface of each fan-shaped body (2) in such a manner that the cutting blade (1) intersects the major axis of the substantially elliptic spherical surface at a side surface as appropriate. Brooch for deburring the surface 3. The broach according to claim 1 or 2, wherein the cutting blade (1) is arranged on a substantially elliptical spherical surface having a minor axis substantially equal to the inner diameter of the pipe (6), and the broach is fixed at a fixed position. , The direction of the pipe (6) fixed in the direction of the pipe axis of the pull rope (7) at the outlet of the pipe is substantially the same, while the rope is pulled from the inlet of the pipe (6). 3. A method of deburring the inner surface of a curved pipe of a brooch according to claim 1 or 2, characterized in that the inner surface of the pipe (6) is slidably passed to the outlet.