JPH0523958A - Grinding method for pipe end, grinding attachment therewith and stock removal regulator - Google Patents

Abstract

PURPOSE:To provide a pipe grinding method, which makes grinding wall thickness equalizable even if the circumferential wall thickness of a pipe end is of nonuniformity by setting the forming reference plane of a pipe body down to the grinding reference plane of the pipe end, and making the center of a pipe accordable with the center of a grinding diameter, and a grinding attachment and a stock removal regulator being available in this method. CONSTITUTION:A grinding attachment is provided with a jig 1 copying after an inner circumferential surface or outer circumferential surface or a forming reference plane of a pipe body, a turning grinding wheel 2 for grinding a pipe end outer circumferential surface or inner circumferential surface of an opposite surface of the reference surface, and a stopper 3, determining an interval between the jig and the grinding cutter according to the grinding eall thickness. A pipe body is rotated or the turning grinding cutter is planetarily rotated till the grinding wall thickness determining stopper attached to a shaft center of the turning grinding cutter is made contact with the jig 1. In addition, an eccentric ring is interposed between the shaft center of the turning grinding cutter and the stopper, turning this ring, thus an amount of stock removal is regulable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for grinding a pipe end having an inner peripheral surface or an outer peripheral surface as a molding reference surface, a grinding device and a grinding amount adjusting device used therefor.

[0002]

2. Description of the Related Art For example, when the outer peripheral surface of the end of the pipe is ground in steps for connecting the pipe, etc., in the prior art, the outer peripheral surface of the pipe is used as a grinding reference surface and a constant thickness from the outer periphery of the pipe is used. I'm grinding. On the other hand, in the case of a tube, a tubular body is formed using the outer peripheral surface of the mandrel as the core as a filament winding method, or a cylindrical inner peripheral surface is used as a reference surface like the centrifugal molding method or blow molding. In many cases, the outer peripheral surface or the inner peripheral surface of the tube is used as the molding reference surface, such as the tube body.

[0003]

However, in the pipe body, unevenness of the thickness in the pipe circumferential direction is often observed, and in such a case, the pipe outer peripheral surface is set as a grinding reference surface and the thickness is constant from the pipe outer periphery. Even if the surface is ground, the circumferential thickness of the ground surface cannot be made uniform. When a collar is attached to the grinding surface on the outer surface of the pipe end to connect the pipes, both pipes are centered at the center of the grinding diameter, but as described above, the outer circumference of the pipe is ground to a constant thickness. In this case, the center of the grinding diameter may not coincide with the center of the pipe, which may cause a step difference in the inner peripheral surface of the pipe connection.

A first object of the present invention is to cope with the above-mentioned problems in the prior art. By making the molding reference surface of the pipe body the grinding reference surface of the pipe end, the circumferential direction of the pipe end is defined. Even if the wall thickness of the pipe is uneven, it is possible to make the grinding wall thickness uniform, and to make the center of the pipe and the center of the grinding diameter coincide with each other, and a grinding device used therefor. To provide.

To achieve this object, as will be described later, in the invention of the present application, a grinding wall thickness determining stopper is used as a means for enabling grinding by a predetermined wall thickness, and the grinding wall thickness determining stopper is ground until the stopper abuts the reference surface. Although the blade is pressed against the tube side, in that case, if the grinding amount is adjusted by changing the size of the stopper, that is, by using a stopper of a different size, the following problem occurs.

That is, it is necessary to prepare many kinds of stoppers having different sizes in advance in order to cope with the increase or decrease of the grinding amount, and the size is determined for each stopper. It is very difficult or impossible to fine-tune. Furthermore, if the grinding amount changes due to wear of the grinding blade,
A new stopper has to be created or modified, and the adjustment cannot be easily changed.

Therefore, in achieving the first object,
Secondly, it is possible to continuously (steplessly) and easily adjust the increase / decrease of the grinding amount of the pipe body, and it is necessary to readjust the grinding amount due to abrasion of the grinding blade. Even in such a case, it is possible to easily readjust the grinding amount. Then, after achieving these objects, as a third object, the tubular body can be ground while rotating at a predetermined grinding position at a constant speed.

[0008]

In order to achieve the first object, the invention according to claim 1 of the present application (hereinafter, referred to as "first invention").
The invention according to claim 2 and the invention according to claim 2 (hereinafter, referred to as “second invention”) are configured as follows. That is, the first invention is a method for grinding a pipe end outer peripheral surface of a pipe body having an inner peripheral surface as a molding reference surface, or a pipe end inner peripheral surface of a pipe body having an outer peripheral surface as a molding reference surface. The tubular body is rotated or the rotary grinding blade is planetarily rotated until the grinding wall thickness determining stopper attached to the shaft center of the rotary grinding blade is brought into contact with the abutted jig. To do.

A second aspect of the invention is to grind a jig that follows the inner peripheral surface or the outer peripheral surface that is the molding reference surface of the tubular body, and the outer peripheral surface of the pipe end or the inner peripheral surface of the pipe end opposite to the reference surface. A rotary grinding blade,
It is characterized in that it is provided with a stopper that determines the distance between the jig and the grinding blade according to the grinding thickness. Furthermore, in order to achieve the second object, the inventions described in claims 3, 4, 5, and 6 of the present application (hereinafter, “third invention”, “fourth invention”, and “fifth invention”, respectively). Invention ”and“ sixth invention ”) are configured as follows.

That is, the third invention is a grinding amount adjusting device used in the method of the first invention, which is rotated so as to come into contact with a jig which follows the inner peripheral surface or the outer peripheral surface which is the molding reference surface of the tubular body. A stopper provided around the axis of the grinding blade and the stopper and the rotary grinding blade so that the grinding amount in the wall thickness direction with respect to the outer peripheral surface of the pipe end or the inner peripheral surface of the pipe end, which is the surface to be ground, can be adjusted. An eccentric ring which is interposed between the shaft center and the shaft center and is rotatable around the shaft center.

In this case, in particular, in the fifth aspect of the invention, the jig with which the stopper is brought into contact is a chuck core provided in parallel with the axis of the rotary grinding blade, or the inner peripheral surface which is the molding reference surface of the tubular body. It is configured by a pressing roller that presses the surface or the outer peripheral surface. A fourth invention is the method of the first invention, wherein the eccentric ring is rotated around the axis of the rotary grinding blade until the stopper comes into contact with the jig by using the grinding amount adjusting device according to the third invention. By changing the distance, the amount of movement of the rotary grinding blade in the wall thickness direction with respect to the pipe end outer peripheral surface or the pipe end inner peripheral surface, which is the surface to be ground, is changed to adjust the grinding amount.

A sixth aspect of the present invention is a grinding apparatus used in the first aspect of the present invention, which comprises a chuck core or a pressing roller forming a jig that follows the inner peripheral surface or the outer peripheral surface of the tubular body, which is the molding reference surface. A rotary grinding blade for grinding a pipe end outer peripheral surface or a pipe end inner peripheral surface opposite to the reference surface, and a grinding amount adjusting device according to a third aspect of the invention. Furthermore, in order to achieve the third object, the invention according to claim 7 of the present application (hereinafter,
The "7th invention" is, in the grinding apparatus according to the 6th invention, a positioning roller arranged in the peripheral portion of the jig to regulate the end face position of the tubular body, and a predetermined angle with respect to the axial center of the tubular body. A driving roller is provided so as to come into contact with the outer peripheral surface of the tubular body in an inclined state, and the tubular body rotating device is provided for pressing the positioning roller while rotating the tubular body by the driving roller.

[0013]

In the first or second aspect of the invention, the forming reference surface of the pipe body serves as the grinding reference surface of the pipe end, and the distance between the grinding reference surface and the rotary grinding blade is limited by the stopper. Grinding is performed until. Therefore, the thickness after grinding (grinding thickness) becomes constant from the reference surface, and the center of the grinding reference surface and the center of the grinding diameter coincide. In this case, since the center of the grinding reference surface and the center of the pipe body coincide with each other, the center of the pipe body coincides with the center of the grinding diameter, and the grinding wall thickness becomes uniform in the circumferential direction of the pipe body.

In the third invention or the fourth invention,
When the eccentric ring is rotated around the axis of the rotary grinding blade, the stopper set on the outer peripheral side thereof contacts the jig (in the fifth and sixth inventions, the chuck or the pressing roller). The distance, that is, the moving amount of the rotary grinding blade in the wall thickness direction with respect to the pipe end outer peripheral surface or the pipe end inner peripheral surface, which is the surface to be ground, continuously changes according to the eccentricity of the eccentric ring. Therefore, the grinding amount in the wall thickness direction of the pipe end can be adjusted steplessly.

Further, according to the seventh aspect of the invention, the driving roller, which is inclined by a predetermined angle with respect to the axial center of the tubular body, rotates while being in contact with the outer peripheral surface of the tubular body, so that the tubular body is moved in the axial direction. The driving force and the rotational force about the axis are given at the same time. As a result, it is possible to grind while rotating the tube body at a constant speed at the position (grinding position) while the end surface of the tube body is pressed against the positioning roller arranged in the peripheral portion of the jig.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the method for grinding a pipe end portion of the present invention. In FIG. 1, P is a tubular body having an inner peripheral surface as a molding reference surface, for example, an FRP tube in which a FRP base material is molded into a tubular body on a mandrel by a filament winding method. The center. Reference numeral 1 is a copying jig that is in contact with the inner circumference of the pipe end, and uses a roller. Reference numeral 2 denotes a rotary grinding blade that grinds the outer circumference of the pipe end. 3 is a stopper for determining the grinding thickness, which is attached to the axis of the rotary grinding blade 2.

The radius of the stopper 3 is set to R _{3, and the} rotary grinding 2
If the radius of R is R ₂ , the grinding wall thickness ε is ε = R ₃ −R ₂
Given in. In FIG. 1, in order to grind the outer periphery of the end portion of the pipe P, the copying roller 1 is fixed, the pipe P is rotated, and the rotary grinding blade 2 is moved toward the copying roller 1,
The rotary grinding blade 2 is moved until the stopper 3 hits the copying roller 1.

In the above, the pipe P may be fixed, and the copying roller 1 may be rotated along the inner circumference of the pipe end as a planet, and the rotary grinding blade 2 may be moved toward the copying roller 1 while rotating the planet. In the above, even if the diameter of the pipe P is different, the grinding device can be used as it is. FIG. 2 shows a second embodiment of a pipe end grinding device of the present invention, in which a taper core type chuck is used as the copying jig 1 which comes into contact with the pipe inner peripheral surface which is a molding reference surface, instead of the above roller. I'm using it.

In the apparatus shown in FIG. 2, the inner peripheral half of the pipe body P
Diameter is R₀, Radius of chuck 1 is R₁, Half of the rotary grinding blade 2
Diameter is R_2,The radius of stopper 3 is R₃If so, grinding thickness
ε is ε = (R₃-R₂) + (R₁-R₀) Given by
The inner diameter R of the pipe P₀If it changes, outside the chuck 1.
Diameter R₁It can be dealt with by adjusting. FIG. 3 shows the tube end of the present invention.
3 shows a third embodiment relating to a grinding device for parts,
As a copying jig 1 that comes into contact with the inner peripheral surface of the pipe,
I am using a backpack. In this tube end grinding device
Is a constant radius of the disk portion of the chuck 1,
The radius A of this disk portion and the inner diameter R of the pipe P₀And rotary grinding
Radius R of blade 2₂And the radius R of stopper 3₃And grinding wall thickness ε
Between ε = (A−R₂) + (R₃-R ₀)connection of
And the inner diameter dimension R of the pipe P₀If it changes, the stopper
Outer diameter R of 3₃It can be dealt with by adjusting.

Also in the embodiment shown in FIG. 2 or FIG. 3, as in the embodiment shown in FIG. 1, the method of rotating the pipe P to fix the grinding blade 2 side, the pipe P being fixed and the grinding blade is fixed. Two
It can be driven by any method of rotating the side. FIG. 4 is a cross-sectional view showing a fourth embodiment of the method for grinding a pipe end portion of the present invention, which is intended for grinding the inner peripheral surface of the end portion of the pipe body having the outer peripheral surface as a molding reference surface.

In FIG. 4, P is a tube having an outer peripheral surface as a molding reference surface, for example, an FRP tube molded by a centrifugal molding method (for example, an FRP base material is supplied into a rotary cylinder and the base material is centrifuged). It is formed into a tube by force), and the center of the outer circumference of the tube is the original center of the tube. 1 is a copying roller that abuts the outer circumference of the pipe end, 2 is a rotary grinding blade that grinds the inner circumference of the pipe end, 3 is a stopper that determines the grinding thickness, and is attached to the axis of the rotary grinding blade 2. There is.

In FIG. 4, in order to grind the inner circumference of the end portion of the pipe P, the copying roller 1 is fixed, the pipe P is rotated, and the rotary grinding blade 2 is moved toward the copying roller 1,
Until the stopper 3 hits the copying roller 1, the rotary grinding blade 2 is moved, or the tube body P is fixed,
The copying roller 1 is rotated planetarily along the outer circumference of the tube end portion, and the rotating grinding blade 2 is rotated planetarily while the copying roller 1 is being rotated.
Move towards.

In this case, the center of the outer circumference of the pipe coincides with the center of the grinding circumferential surface, and therefore the center of the pipe (center of the outer circumference of the pipe) coincides with the center of the grinding diameter. Next, a fifth embodiment of the present invention will be described. This embodiment relates to a grinding device having a device for adjusting the amount of grinding of the pipe end, and FIGS.
[Fig. 3] is a partially omitted side view and a plan view showing the grinding device.

As shown in FIG.
Basically, a tubular body support unit 20 for supporting a tubular body (in this embodiment, a resin concrete pipe having a relatively large diameter and made of a synthetic resin layer and a concrete layer whose inner peripheral surface is a molding reference plane) P, The roller holding unit 30 is arranged so as to be positioned in front of the pipe body P set on the unit 20, and is arranged so as to be located below the pipe end portion, which is a portion to be ground of the pipe body P. It is configured with a grinding blade support unit 40.

Of these, in the roller holding unit 30, a frame 32 is provided on the upper part of the support column 31, and the slide member 33 is attached to the frame 32 by the arrow B-.
It is provided so as to be slidable in the B'direction. An elevating cylinder 34 is attached to an upper part of the front surface side (a side facing the pipe body P) of the slide member 33, and a rod that protrudes downward from the cylinder 34 and can be retracted in the vertical direction. The holding member 34 is attached to the front end (lower end) of the portion 34a.
A pressing roller 35 that presses the inner peripheral surface P ₁ that is the molding reference surface of the tubular body P is rotatably held via b.

Further, the pressing roller 3 is directed toward the pipe body P.
A pair of positioning rollers 36, 36 with which the end surface P ₂ of the tube end portion abuts during grinding is provided on both sides of 5. These positioning rollers 36, 36 are vertically movable so that they can be brought into contact with the pipe end positions even for pipe bodies having different diameters. Further, an air cylinder 37 for driving a slide member is attached to the lower surface side of the frame 32, and the tip of a rod portion 37a of the cylinder 37 is connected to the rear surface of the slide member 33. Then, by pushing the rod portion 37a back and forth and sliding the slide member 33 in the direction of arrow BB ', the pressing roller 35 can be taken in and out of the end portion of the pipe body P. This is because, for example, after grinding the pipe end, the pressing roller 3 is placed outside the pipe end.
This is because the pipe 5 can be extracted and the pipe P can be moved in the lateral direction.

On the other hand, the tubular body supporting unit 20 has a rectangular supporting base 21 as viewed from above, and a plurality of free rollers 22 for rotatably supporting the tubular body P at predetermined positions on the supporting base 21. .... 22 and drive rollers 23 ... 23
And a motor 26 for rotating each drive roller 23 via a rotary drive shaft 24 and a belt 25.

Each drive roller 23 and free roller 2
2 are provided in such a state that their axes are inclined with respect to the axis of the pipe body P by a predetermined angle. Then, each of the drive rollers 23 is rotated in a predetermined direction by the motor 26, and a rotational force around the axis of the tubular body P and a forward drive force (a direction in which the roller holding unit 30 is located) are applied to the tubular body P. As a result, the tubular body P is rotated about its axis at a predetermined speed while pressing its end surface P ₁ against the positioning rollers 36, 36.

Further, the grinding blade support unit 40 includes a pipe body P.
A cylindrical rotary grinding blade 41 for grinding the outer peripheral surface of the pipe end portion of
A grinding amount adjusting device 42 attached to the axis of the grinding blade 41 and a motor 44 for rotationally driving the grinding blade 41 via a belt 43 are provided in a supporting device 45. The support device 45 is provided on a support base 46, and a support portion 45 that supports the shaft center of the rotary grinding blade 41.
a is a cylinder 47 ... 47 and a guide rod 48 ...
It is supported so as to be vertically movable via 48, and is slidable in the left-right direction in FIG. 5 (direction parallel to the axis of the pipe P or the rotary grinding blade 41) by rotating the handle 49.

From the state shown in FIG. 5, the cylinder 47 ...
By protruding the rod portion of 47 by a predetermined amount, the rotary grinding blade 41 and the grinding amount adjusting device 42 can be moved to the pressing roller 35 side, and the handle 49 is rotated to slide the supporting device 45. The grinding width of the rotary grinding blade 41 with respect to the outer peripheral surface of the pipe body P in the axial direction (the lateral direction in the drawing) can be adjusted.

Next, the grinding amount adjusting device 42 provided in the grinding blade supporting unit 40 will be described in more detail. As shown in an enlarged view in FIG. 7, the grinding amount adjusting device 42 includes an eccentric ring 51 rotatably attached to an axis 41a of the rotary grinding blade 41 via ball bearings 50, 50, and an eccentric ring 51. The ring-shaped stopper 54 is attached to the outer peripheral side of the ring 51 via a roller bearing 52 and an intermediate member 53.

Among them, the stopper 54 is attached to the intermediate member 53 by the bolt 5 so that the stopper 54 can be replaced if necessary.
5 ... 55 are combined. On the other hand, the eccentric ring 51 is provided with a set portion 51a for fixing the ring on the outer circumference of the end portion located on the side opposite to the rotary grinding blade 41, and the set portion 51a has the support portion 45a of the support device 45. The set bolt 56 is set from the side.

As shown in FIG. 8, the center O'of the eccentric ring 51 is eccentric with respect to the axial center O of the rotary grinding blade 41 by a predetermined amount, and the setting portion 51a shown in FIG. On the other hand, by tightening the set bolt 56, it is fixed so as not to rotate, and conversely, by loosening the set bolt 56, it can be rotated around the axis of the rotary grinding blade 41. The outer periphery of the set portion 51a of the eccentric ring 51 is a circumferential surface that is concentric with the axis 41a of the rotary grinding blade 41.

Next, a method of grinding the outer peripheral surface of the end portion of the pipe P using the grinding device 10 will be described. First, as shown in FIG. 5 or 6, the tube P is placed on each free roller 22 and the drive roller 23 of the tube support unit 20 and the end surface P ₂ thereof is brought into contact with or close to the positioning rollers 36, 36. In this state, the inner peripheral surface P ₁ which is the molding reference surface is pressed by the pressing roller 35. Then, each driving roller 23 is rotated by the motor 26 in the tubular body supporting unit 20, whereby the tubular body is rotated at a constant speed while pressing the end surface of the tubular body against the positioning roller.

On the other hand, in the grinding blade supporting unit 40, as shown in FIG. 7, the eccentric ring 51 of the grinding amount adjusting device 42 is set on the support portion 45a of the supporting device 45 so as not to rotate from its preset position. Secure with bolts 56. In the state of FIG. 7, the eccentric ring 51 is fixed at a position where the wall thickness of the eccentric ring 51 becomes equal to the vertical direction (the YY ′ direction shown in FIG. 8).

Next, in the above-mentioned state, while rotating the rotary grinding blade 41 by the motor 44 of the grinding blade supporting unit 40, the cylinders 47 ...
The rotary grinding blade 41 and the grinding amount adjusting device 4 are operated by operating 47.
Move 2 up. With this configuration, while the pipe P is rotating, the rotary grinding blade 41 is rotated first while the pipe P is rotating.
Abutting on the outer peripheral surface of the pipe end, which is the part to be ground, and grinding the outer peripheral surface by a predetermined amount, and thereafter, as shown in FIG.
When the stopper 54 of the grinding amount adjusting device 42 contacts the pressing roller 35, the movement of the rotary grinding blade 41 in the wall thickness direction with respect to the outer peripheral surface of the pipe end portion is stopped. As a result, the end portion of the tubular body P is ground from the initial outer peripheral surface P ₃ by a predetermined thickness.

Also in this case, the center of the outer circumference of the pipe and the center of the grinding circumferential surface coincide, and thus the center of the pipe P (center of the outer circumference of the pipe) coincides with the center of the grinding diameter. As described above, according to the above configuration, the rotary grinding blade 41 is moved to the pressing roller 35 side together with the grinding amount adjusting device 42 until the stopper 54 contacts the pressing roller 35, so that the pipe pressed by the pressing roller 35 is moved. The inner peripheral surface P _1, that is, the molding reference surface is used as the grinding reference surface, and the outer peripheral surface of the pipe end is ground by a predetermined thickness.
Further, the grinding amount can be adjusted steplessly as follows.

That is, for example, when it is desired to reduce the amount of wall thickness grinding of the pipe P more than in the above case, the rotary grinding blade 4
Before rotating 1, the set bolt 56 is loosened, and the eccentric ring 51 in the grinding amount adjusting device 42 is rotated in advance from the state of FIG. 8 around the shaft center 41a of the rotary grinding blade 41 by a predetermined amount. At the position after the rotation, the set bolt 56 is tightened again to fix the eccentric ring 51.

In that case, when the radial direction (the X direction in FIG. 8) having the largest wall thickness in the eccentric ring 51 is fixed so as to face the upper pressing roller 35 side, as shown in FIG. The distance between the roller 35 and the rotary grinding blade 45 becomes maximum (the amount of grinding in the thickness direction is minimum) when the stopper 54 is brought into contact with the roller. On the contrary, when the eccentric ring 51 is fixed so that the radial direction (X ′ direction in FIG. 8) having the smallest wall thickness faces upward, as shown in FIG. 11, the pressing roller 35 and the rotary grinding blade 4 are fixed.
The distance from 1 is the minimum (the maximum grinding amount in the thickness direction).

In this way, the eccentric ring 51 is rotated around the axis of the rotary grinding blade 41 and then fixed at a desired position, whereby the rotary grinding is performed with the stopper 54 abutting on the pressing roller 35. The distance between the blade 41 and the pressing roller 35 can be changed steplessly from the above-mentioned minimum to maximum. Then, in this case, the interval between the pressing roller 35 and the rotary grinding blade 41 is equal to the wall thickness (ground wall thickness) of the pipe end after grinding.

Therefore, it becomes possible to adjust the grinding amount by subtracting the wall thickness after grinding from the wall thickness at the pipe end before grinding within a predetermined range in a stepless manner. It should be noted that when grinding pipes having different diameters, the grinding amount may have to be changed significantly, but in that case, it is conceivable that the adjustment of only the eccentric ring 51 as described above cannot deal with it.
In such a case, the stopper 54 connected to the intermediate ring 53 may be replaced with another one having a different size, and then the eccentric ring 51 may be used for the adjustment.

Further, in order to easily obtain a predetermined grinding amount when the grinding amount is adjusted by rotating the eccentric ring 51, the outer circumference of the eccentric ring 51 is provided with a uniform scale in the circumferential direction, or the eccentric ring 51 is rotated. Pressing roller 3 when moved
5 may be provided unevenly in the circumferential direction of the eccentric ring 51 according to the amount of change in the distance between the rotary grinding blade 41 and the rotary grinding blade 41. In addition, the eccentric ring 1 with which the tip of the set bolt 56 abuts
A plurality of grooves corresponding to the amount of grinding at each stage are formed in the setting portion 51a, and a groove corresponding to the required amount of grinding is selected from among the plurality of grooves, and the set bolt 56 is set therein. You may

Further, the grinding apparatus 10 according to the fifth embodiment.
Is equipped with the pressing roller 35 as a jig for copying the inner surface P ₁ which is the molding reference surface of the pipe P, it is possible to grind a pipe having a relatively large diameter to a small diameter.
In the case of grinding a pipe having a relatively small diameter, a chuck as shown in FIG. 2 or 3 may be used instead of the pressing roller 35 as described above.

[0044]

The pipe end part grinding method of the first invention of the present application and the grinding device of the second invention used for the same are as described above, and the copying jig is brought into contact with the molding reference surface of the pipe. The surface opposite to the reference surface is ground with a rotary grinding blade, and the grinding is performed until the distance between the rotary grinding blade and the copying jig reaches the distance regulated by the stopper. Since the center of the molding reference surface and the center of the pipe coincide with each other, the center of the pipe and the center of the grinding diameter can coincide with each other, and the grinding wall thickness can be made uniform in the pipe circumferential direction.

In addition to such effects, the third aspect of the present application
According to the grinding amount adjusting device of the invention and the grinding method of the fourth invention or the grinding device of the sixth invention using the same, the rotation in the wall thickness direction with respect to the pipe end outer peripheral surface or the pipe end inner peripheral surface which is the surface to be ground. The amount of movement of the grinding blade can be continuously changed by rotating the eccentric ring. This allows stepless and easy adjustment of the grinding amount in the wall thickness direction of the pipe end, and even when it is necessary to readjust the grinding amount due to wear of the grinding blade. The amount of grinding can be readjusted easily.

Further, in addition to these effects, according to the grinding apparatus of the seventh invention, the end surface of the pipe body is pressed against the positioning roller arranged in the peripheral portion of the jig, and at a predetermined speed at the predetermined position. Since the grinding is performed while being rotated by, the grinding width in the generatrix direction on the outer peripheral surface or the inner peripheral surface of the pipe end portion becomes constant, and the grinding process can be performed with higher accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a grinding apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage state of a grinding device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a usage state of a grinding device according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a usage state of a grinding apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a partially omitted side view showing a grinding device according to a fifth embodiment of the present invention.

FIG. 6 is a partially omitted plan view of the grinding apparatus.

FIG. 7 is a partially cutaway side view showing an enlarged periphery of a grinding amount adjusting device in the grinding device.

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

FIG. 9 is an enlarged side view of the periphery of a grinding amount adjusting device showing an example of a state in which a stopper is brought into contact with a pressing roller in the fifth embodiment.

FIG. 10 is an enlarged side view of the periphery of the grinding amount adjusting device showing the grinding state in the case where the grinding amount is minimum (the wall thickness after grinding is maximum) in the embodiment.

FIG. 11 is an enlarged side view of the periphery of a grinding amount adjusting device showing a grinding state when the grinding amount is maximum (the thickness after grinding is minimum) in the embodiment.

[Explanation of symbols]

1, 35 ... Copying jig (35 ... Pressing roller), 2, 41 ... Rotating grinding blade, 3, 54 ... Stopper, P ... Tube body, 10 ... Grinding device, 23, 24, 25, 26 ... Tube rotating device (23 ... Drive roller, 24 ... Rotation drive shaft, 2
5 ... Belt, 26 ... Motor), 36 ... Positioning roller, 41a ... Shaft center of rotary grinding blade, 42 ... Grinding amount adjusting device, 51 ... Eccentric ring.

Claims (7)

[Claims] 1. A method of grinding a pipe end outer peripheral surface of a pipe body having an inner peripheral surface as a molding reference surface or a pipe end inner peripheral surface of a pipe body having an outer peripheral surface as a molding reference surface, the method comprising: The tubular body is rotated or the rotary grinding blade is planetarily rotated until the grinding wall thickness determining stopper attached to the shaft center of the rotary grinding blade is brought into contact with the abutted jig. Method of grinding pipe end. 2. A jig that follows an inner peripheral surface or an outer peripheral surface that is a molding reference surface of a pipe body, and a rotary grinding blade that grinds a pipe end outer peripheral surface or a pipe end inner peripheral surface opposite to the reference surface. A grinding device for a pipe end, comprising: a stopper that determines a distance between the jig and a grinding blade according to a grinding thickness. 3. An apparatus used in the method for grinding a pipe end portion according to claim 1, wherein the device is rotated so as to come into contact with a jig that follows an inner peripheral surface or an outer peripheral surface that is a molding reference surface of the pipe body. A stopper provided around the axis of the grinding blade and the stopper and the rotary grinding blade so that the grinding amount in the wall thickness direction with respect to the outer peripheral surface of the pipe end or the inner peripheral surface of the pipe end, which is the surface to be ground, can be adjusted. An eccentric ring which is interposed between the shaft center and the eccentric ring rotatable around the shaft center. 4. The grinding amount adjusting device according to claim 3, wherein the eccentric ring is rotated around the axis of the rotary grinding blade to change the interval until the stopper comes into contact with the jig. 2. The method for grinding a pipe end according to claim 1, wherein the amount of grinding is adjusted by changing the amount of movement of the rotary grinding blade in the wall thickness direction with respect to the outer peripheral surface of the pipe end or the inner peripheral surface of the pipe end, which is the grinding surface. . 5. A jig for holding a stopper in contact with a chuck core provided parallel to the axis of a rotary grinding blade, or a presser for pressing an inner peripheral surface or an outer peripheral surface which is a molding reference surface of a tubular body. 4. A roller, which is a roller.
The grinding amount adjusting device described in. 6. A chuck core or a pressing roller that constitutes a jig that follows the inner peripheral surface or the outer peripheral surface that is the molding reference surface of the pipe body, and the pipe end outer peripheral surface or the pipe end inner peripheral surface opposite to the reference surface. A grinding device for a pipe end, comprising a rotary grinding blade for grinding a pipe, and the grinding amount adjusting device according to claim 3. 7. A positioning roller arranged in the peripheral portion of the jig to regulate the position of the end surface of the tubular body, and contacts the outer peripheral surface of the tubular body in a state inclined by a predetermined angle with respect to the axial center of the tubular body. 7. A pipe end grinding device according to claim 6, further comprising: a drive roller, and a pipe rotating device that presses against a positioning roller while rotating the pipe by the drive roller.