JP3290455B2 - Tube end grinding method, grinding device and grinding amount adjusting device used for the method - Google Patents

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 using an inner peripheral surface or an outer peripheral surface as a molding reference surface, and a grinding device and a grinding amount adjusting device used therefor.

[0002]

2. Description of the Related Art For example, when grinding an outer peripheral surface of an end portion of a pipe in a stepped manner for connection of the pipe body or the like, conventionally, a predetermined thickness is set from the outer circumference of the pipe with the outer peripheral face of the pipe as a grinding reference plane. Grinding. On the other hand, in the case of a tube, a tubular body is formed on the basis of the outer peripheral surface of a core mandrel as in a filament winding method, and a cylindrical inner peripheral surface is formed as a reference surface in a centrifugal molding method or blow molding. In many cases, the outer peripheral surface or inner peripheral surface of the tube is used as a molding reference surface, as in the case of a tube body to be formed.

[0003]

However, in the pipe body, unevenness in the thickness in the circumferential direction of the pipe is often observed, and in such a case, the outer circumferential surface of the pipe is defined as a grinding reference plane and a certain thickness from the outer circumference of the pipe. However, even if the surface is ground, the circumferential thickness of the ground surface cannot be made uniform. Also, when connecting a pipe by attaching a collar to the grinding surface on the outer surface of the pipe end, both pipes will be aligned at the center of the grinding diameter, but grinding with a constant thickness from the outer circumference of the pipe as described above In this case, the center of the grinding diameter may not match the center of the pipe, and a step may occur on the inner peripheral surface of the pipe connection.

[0004] A first object of the present invention is to address the above-mentioned problems in the prior art. By setting the forming reference surface of the tube as a grinding reference surface of the tube end, the circumferential direction of the tube end can be improved. Grinding method of pipe end and grinding device used for making uniform grinding wall thickness and making center of pipe and center of grinding diameter possible even if wall thickness is not uniform Is to provide.

In order to achieve this object, the invention of the present application uses a grinding thickness determining stopper as a means for grinding by a predetermined thickness, as will be described later, and grinds until the stopper comes into contact with a reference surface. The blade is pressed against the tube side. In this case, if the amount of grinding is adjusted only by changing the size of the stopper, that is, by using a stopper having a different size, the following problem occurs.

That is, in order to cope with an increase or decrease in the amount of grinding, it is necessary to prepare various types of stoppers having different sizes in advance, and since the size is determined for each stopper, once the stopper is attached, the amount of grinding is It is very difficult or impossible to make fine adjustments to. Furthermore, when the amount of grinding changes due to wear of the grinding blade, etc.,
A new stopper must be created or modified and cannot be easily adjusted.

Therefore, in achieving the first object,
As a second object, it is possible to continuously and steplessly increase and decrease the amount of grinding of the pipe body, and it is necessary to adjust the amount of grinding again due to wear of the grinding blade. In this case, the grinding amount can be easily readjusted. In addition to achieving these objects, a third object is to enable grinding while rotating the tube at a predetermined grinding position at a constant speed.

[0008]

SUMMARY OF THE INVENTION The first object and the second object are as follows.
In order to achieve the goal , claim 1, claim 2, claim 3 and
And the invention according to claim 4 (hereinafter referred to as “first invention”, “second invention”).
Invention, "third invention," and "fourth invention."
Each was configured as follows.

[0009] That is, the grinding method of the tube end portion of the first invention
Is the inner peripheral surface of the tube end or the outer peripheral surface of the tube end, which is the molding reference surface of the tube.
Around the axis of the rotary grinding blade to contact the jig
The stopper provided and the outer peripheral surface of the pipe end which is the ground surface
Can adjust the amount of grinding in the thickness direction for the inner peripheral surface of the pipe end.
Between the stopper and the axis of the rotary grinding blade.
And an eccentric ring rotatable around the axis.
Around the axis of the rotary grinding blade
Rotate the eccentric ring until the stopper contacts the jig.
By changing the gap at the end, the outer circumference of the pipe end
Grinding blade in the thickness direction for the inner surface of pipe or pipe end
While adjusting the grinding amount by changing the moving amount of
Or planetary rotation of a rotary grinding blade.
You.

In the grinding amount adjusting apparatus according to the second invention, the pipe
Following the inner peripheral surface of the tube end or the outer peripheral surface of the tube end, which is the molding reference surface of the body
Around the axis of the rotary grinding blade to abut the jig
Stopper and the pipe end outer peripheral surface or pipe end that is the surface to be ground
Before adjusting the thickness of the inner peripheral surface in the thickness direction
Between the stopper and the axis of the rotary grinding blade.
An eccentric ring rotatable about an axis.
And features.

In this case, in particular, the cutting grinding amount adjustment according to the third invention.
In the device , the jig to be brought into contact with the stopper is controlled by a chuck core provided in parallel to the axis of the rotary grinding blade, or a press roller that presses the inner peripheral surface or outer peripheral surface that is the forming reference surface of the tube. Constitute.

[0011] Grinding apparatus of the fourth invention, the chuck core or pressure roller constituting the jig follows the inner peripheral surface or outer peripheral surface is molded reference surface of the tube, the tube end on the opposite side of the reference plane A rotary grinding blade for grinding the outer peripheral surface or the inner peripheral surface of the pipe end,
The grinding amount adjusting device according to the second invention is provided.

Furthermore, in order to achieve the third object, the invention according to claim 5 of the present application (hereinafter, "referred to the fifth invention), the
4 In the grinding device according to the present invention, a positioning roller disposed around the jig to regulate the position of the end face of the tube;
A tube rotating device that is provided with a driving roller to be in contact with the outer peripheral surface of the tube at a predetermined angle with respect to the axis of the tube, and that presses against the positioning roller while rotating the tube by the driving roller; It is characterized by having.

[0013]

In the first or second aspect of the present invention, when the eccentric ring is rotated around the axis of the rotary grinding blade, the stopper set on the outer peripheral side of the eccentric ring has a jig ( third and fourth).
In the present invention, the distance until contact with the chuck or the pressing roller), that is, the moving amount of the rotary grinding blade in the 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 is determined by the eccentric amount of the eccentric ring. It changes continuously according to. Therefore, the grinding amount in the thickness direction of the pipe end can be adjusted steplessly.

Furthermore, in the fifth invention, by driving rollers inclined at a predetermined angle relative to the axis of the tubular body is rotated in contact with the outer peripheral surface of the tube, to its axial direction to the tubular body The driving force and the rotational force around the axis are given at the same time. Thus, in a state where the end surface of the tube is pressed against the positioning roller disposed at the periphery of the jig, the tube can be ground at that position (grinding position) while rotating the tube at a constant speed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, a grinding machine having a device for adjusting the amount of grinding at the pipe end is used.
1 and 2 relate to a grinding device.
It is the side view and top view which are partially omitted.

As shown in FIG. 1, this grinding apparatus 10
Basically, a tube support unit 20 for supporting a tube (in this embodiment, a relatively large-diameter resin concrete tube composed of a synthetic resin layer and a concrete layer whose inner peripheral surface is a molding reference surface) P, The roller holding unit 30 is disposed so as to be located in front of the pipe P set on the unit 20, and the roller holding unit 30 is disposed so as to be located below the pipe end which is the portion to be ground of the pipe P. And a grinding blade support unit 40.

In the roller holding unit 30, a frame 32 is provided above a column 31, and a slide member 33 is attached to the frame 32 by an arrow B−.
It is provided so as to be slidable in the direction B '. An elevating cylinder 34 is attached to an upper portion of the front side of the slide member 33 (the side facing the pipe body P), and a rod protruding downward from the cylinder 34 and capable of moving up and down in the vertical direction. The holding member 34 is attached to the tip (lower end) of the portion 34a.
through b, pressure roller 35 for pressing the inner circumferential surface P ₁ is a molded reference surface of the tube P is rotatably held.

Further, the pressing roller 3 moves toward the pipe P.
The both sides of 5, a pair of positioning rollers 36, 36 end surface P ₂ of the tube end during the grinding is in contact is provided. These positioning rollers 36, 36 can be moved up and down so as to be able to come into contact with the pipe ends 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 37 a of the cylinder 37 is connected to the rear surface of the slide member 33. Then, by moving the rod portion 37a back and forth and sliding the slide member 33 in the direction of the arrow BB ', the pressing roller 35 can be moved in and out of the end of the tube P. This is because, for example, after grinding of 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.

Meanwhile, pipe support unit 20 has a rectangular support base 21 when viewed from above, at a predetermined position on the support table 21, a plurality of free rollers rotatably supporting the pipe P 22 · ..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.

[0020] each of the drive roller 23 and the free roller 2
2 are provided in such a state that their axes are inclined by a predetermined angle with respect to the axis of the tube P. Then, each drive roller 23 is rotated in a predetermined direction by the motor 26 to apply the rotational force around the axis and the forward (the direction in which the roller holding unit 30 is positioned) drive force to the pipe P. Accordingly, the tube P is made the end face P ₂ to rotate about the axis at a predetermined speed while pressing on the positioning rollers 36, 36.

The grinding blade support unit 40 is provided with a pipe P
A cylindrical rotary grinding blade 41 for grinding the outer peripheral surface of the tube end;
The apparatus has a grinding amount adjusting device 42 attached to the axis of the grinding blade 41 and a motor 44 for rotatingly driving the grinding blade 41 via a belt 43. The support device 45 is provided on a support base 46 and supports a shaft 45 of the rotary grinding blade 41.
Let a be a cylinder 47 ... 47 and a guide rod 48 ...
1 is supported so as to be able to move up and down via 48, and can be slid in the left and right direction (the direction parallel to the axis of the pipe P or the rotary grinding blade 41) in FIG. 1 by rotating the handle 49.

[0022] Then, the cylinder 47 ... from the state of FIG. 1
By projecting the rod portion of 47 by a predetermined amount, the rotating grinding blade 41 and the grinding amount adjusting device 42 can be moved to the holding roller 35 side, and the support device 45 is slid by rotating the handle 49, The grinding width in the axial direction (the left-right direction in the figure) with respect to the outer peripheral surface of the tubular body P by the rotary grinding blade 41 can be adjusted.

Next, will be described in more detail grinding amount adjusting device 42 provided in the grinding blade support unit 40. As shown in an enlarged view in FIG. 3 , the grinding amount adjusting device 42 includes an eccentric ring 51 rotatably attached to a shaft 41a of the rotary grinding blade 41 via ball bearings 50, 50, and an eccentric ring 51. A 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.

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

[0025] Then, the eccentric ring 51, as shown in FIG. 4, the center O 'are offset by a predetermined amount with respect to the axial center O of the rotating grinding blades 41, set portions 51a shown in FIG. 3 Is fixed so as not to rotate by tightening the set bolt 56, and conversely, by loosening the set bolt 56, the rotary grinding blade 41 can be rotated around its axis. The outer periphery of the set portion 51 a of the eccentric ring 51 is a circumferential surface concentric with the axis 41 a of the rotary grinding blade 41.

[0026] Next, a method of grinding the outer peripheral surface of the end portion of the pipe P by using the grinding apparatus 10. First, contact or in proximity to the positioning rollers 36, 36 each free roller 22 and placing the tube P to the drive roller 23 and the end surface P ₂ of the tube supporting unit 20 as shown in FIG. 1 or 2 In this state, the inner peripheral surface P ₁ , which is the molding reference surface, is pressed by the pressing roller 35. Then, by rotating each drive roller 23 by the motor 26 in the tube support unit 20, the tube is rotated at a constant speed while pressing the end surface of the tube against the positioning roller.

On the other hand, in the grinding blade support unit 40, as shown in FIG. 3, it sets the eccentric ring 51 in the grinding amount adjusting device 42, the bearing portion 45a of the supporting device 45 so as not to rotate from its preset position It is fixed with bolts 56. In the state shown in FIG. 3 , the eccentric ring 51 is fixed at a position where the thickness of the eccentric ring 51 is equal in the vertical direction (YY ′ direction shown in FIG. 4 ).

Next, in the above state, while rotating the rotating grinding blade 41 by the motor 44 in the grinding blade support unit 40, the cylinder 47 of the supporting device 45 ...
47 to operate the rotary grinding blade 41 and the grinding amount adjusting device 4
Move 2 up. In this way, while the pipe P is rotating, the rotary grinding blade 41 first rotates while the pipe P
Of the outer peripheral surface of the tube end which is to be ground portion abuts, by grinding the outer peripheral surface thereof by a predetermined amount, then, as shown in FIG. 5,
When the stopper 54 in the grinding amount adjusting device 42 comes into contact with the pressing roller 35, the movement of the rotary grinding blade 41 in the thickness direction with respect to the outer peripheral surface of the pipe end is stopped. As a result, the ends of the tube P is ground from its original outer peripheral surface P ₃ by a predetermined thickness min.

In this case as well, the center of the outer periphery of the tube coincides with the center of the grinding circumferential surface, and therefore, the center of the tube P (the center of the outer periphery of the tube) coincides with the center of the grinding diameter. As described above, according to the above configuration, by moving the rotary grinding blade 41 to the holding roller 35 side together with the grinding amount adjusting device 42 until the stopper 54 comes into contact with the holding roller 35, the pipe held by the holding roller 35 is moved. Although so that the outer peripheral surface of the tube end to the body circumferential surface P _1, that molded reference surface as the grinding reference surface is ground by a thickness worth predetermined wall,
Further, it is possible to adjust the grinding amount steplessly as follows.

[0030] That is, for example, when it is desired to reduce the thickness grinding amount of the tube P than the above case, the rotating grinding blades 4
Before rotating 1, the set bolt 56 is loosened, and the eccentric ring 51 in the grinding amount adjusting device 42 is previously rotated from the state of FIG. 4 around the axis 41 a 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.

[0031] In this case, the radius direction (X direction in FIG. 4) is fixed so as to face the 35 side above the presser roller having a maximum thickness in the eccentric ring 51, as shown in FIG. 6, the pressing roller 35 The distance between the roller 35 and the rotary grinding blade 45 becomes maximum (the amount of grinding in the thickness direction is minimum) in a state where the stopper 54 is in contact with the roller 35. Conversely, the eccentric ring 51 is moved in the radial direction having its minimum thickness (FIG. 4 ).
7 is fixed such that the X ′ direction of FIG.
As shown in (2), the distance between the pressing roller 35 and the rotary grinding blade 41 is minimum (the amount of grinding in the thickness direction is maximum).

[0032] By fixing at a desired position on which rotates the eccentric ring 51 In this manner about the axis of rotation the grinding blade 41, rotating grinding in being in contact with the stopper 54 to the pressure roller 35 The distance between the blade 41 and the pressing roller 35 can be changed steplessly from the minimum to the maximum. In this case, the distance between the pressing roller 35 and the rotary grinding blade 41 is equal to the wall thickness (grinding wall thickness) of the pipe end after grinding.

[0033] Therefore, it is possible to steplessly adjust the grinding amount obtained by subtracting the thickness after grinding from the wall thickness of the tube ends before grinding in a predetermined range. In the case of grinding pipes having different diameters, the amount of grinding may have to be significantly changed. In such a case, it may not be possible to cope with the above-described adjustment of the eccentric ring 51 alone.
In such a case, the adjustment using the eccentric ring 51 may be performed after replacing the stopper 54 connected to the intermediate ring 53 with another stopper having a different size.

In order to easily obtain a predetermined grinding amount when the grinding amount is adjusted by rotating the eccentric ring 51, a scale is provided on the outer periphery of the eccentric ring 51 in the circumferential direction, or the eccentric ring 51 is rotated. Pressing roller 3 when moved
A scale may be provided unevenly in the circumferential direction of the eccentric ring 51 in accordance with the amount of change in the distance between the eccentric ring 5 and the rotary grinding blade 41. Further, the eccentric ring 1 with which the tip of the set bolt 56 contacts
A plurality of grooves corresponding to the amount of grinding at each stage are formed in the set 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 in this. It may be.

Furthermore, the grinding apparatus 10 according to this embodiment,
Although it is possible to grind the tube of relatively from large diameter to small diameter in that it comprises a pressing roller 35 as a jig to follow the inner surface P ₁ is a molded reference surface of the tube P, relatively small When grinding a pipe having a diameter, a chuck may be used instead of the pressing roller 35 as described above. Ma
In addition, the grinding machine is equipped with
Instead of par, the outer surface that is the molding reference surface of the
Grind the jig and the inner peripheral surface of the tube end opposite to the reference surface
Rotary grinding blade, the distance between the jig and the grinding blade to the grinding thickness
Even if it is equipped with a stopper determined according to
Good. In addition, the method of grinding the pipe end is to form the inner peripheral surface described above.
Instead of grinding the outer peripheral surface of the pipe end as the reference plane,
How to grind the inner peripheral surface of the tube end with the peripheral surface as the forming reference surface
It may be modal.

[0036]

According to the grinding amount adjusting device of the second invention of the present application and the grinding method of the first invention or the grinding device of the fourth invention using the same, the center of the pipe is made to coincide with the center of the grinding diameter.
In addition to the effect of making the grinding thickness uniform in the circumferential direction of the pipe, the moving amount of the rotary grinding blade in the 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, is controlled by rotating the eccentric ring. Can be changed steplessly. Thereby, the increase and decrease of the amount of grinding in the thickness direction of the pipe end can be steplessly and easily performed, and even in a case where it is necessary to adjust the amount of grinding again due to wear of the grinding blade or the like. The amount of grinding can be easily readjusted.

Furthermore, in addition to these effects, according to the grinding apparatus of the fifth invention, the end face of the tube to the arranged positioned rollers in the periphery of the jig is pressed against, constant at a predetermined position thereof velocity The grinding width in the generatrix direction on the outer peripheral surface or the inner peripheral surface of the pipe end becomes constant, so that highly accurate grinding can be performed.

[Brief description of the drawings]

FIG. 1 is a partially omitted side view showing a grinding device according to an embodiment of the present invention .

FIG. 2 is a partially omitted plan view of the grinding device.

FIG. 3 is a partially cutaway side view showing the periphery of a grinding amount adjusting device in the grinding device in an enlarged manner.

4 is a longitudinal sectional view taken along the line A-A of FIG.

FIG. 5 is an enlarged side view of the vicinity 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 embodiment .

FIG. 6 is an enlarged side view of the vicinity of the grinding amount adjusting device showing a grinding state when the grinding amount is minimum (the wall thickness after grinding is maximum) in the embodiment.

FIG. 7 is an enlarged side view of the vicinity of the grinding amount adjusting device showing a grinding state when the grinding amount is maximum (the thickness after grinding is minimum) in the embodiment.

[Description of Signs] 35 : Copying jig (35: pressing roller), 41: rotary grinding blade, 54: stopper, P: tubular body, 10: grinding device, 23 , 24, 25, 26: tube rotating device (23: drive roller, 24: rotary drive shaft, 2)
Reference numeral 5 denotes a belt, 26 denotes a motor), 36 denotes a positioning roller, 41a denotes an axis of a rotary grinding blade, 42 denotes a grinding amount adjusting device, and 51 denotes an eccentric ring.

Claims (5)

(57) [Claims] An inner peripheral surface of a tube end which is a forming reference surface of a tube or
Rotary grinding blade shaft to abut the jig following the outer peripheral surface of the pipe end
A stopper placed around the heart and a tube to be ground
Adjust the grinding amount in the thickness direction for the outer peripheral surface of the end or the inner peripheral surface of the pipe end.
Between the stopper and the axis of the rotary grinding blade so that
An eccentric rib interposed therebetween and rotatable around the axis.
By rotating the eccentric ring about the axis of the rotary grinding blade and changing the interval until the stopper comes into contact with the jig using the grinding amount adjustment device having while adjusting the grinding amount by changing the amount of movement of the rotating grinding blades in the thickness direction with respect to the surface or the pipe end inside peripheral surface, the tube
Rotating the rotating grinding blade or planetary rotation.
Characteristic grinding method of pipe end. 2. An inner peripheral surface of a tube end , which is a forming reference surface of a tube , or
A stopper arranged around the axis of rotation the grinding blade so as to abut against the jig to follow the tube end outer peripheral surface, the thickness direction of the grinding against the tube end outer or pipe end inside peripheral surface which is to be ground surface An eccentric ring interposed between the stopper and the axis of the rotary grinding blade so that the amount can be adjusted, and an eccentric ring rotatable around the axis. . 3. A jig to be brought into contact with a stopper is a chuck core provided in parallel with the axis of a rotary grinding blade, or a presser for pressing an inner peripheral surface or an outer peripheral surface which is a forming reference surface of a tubular body. 3. A roller according to claim 2, wherein the roller is a roller.
The grinding amount adjusting device according to 1. 4. A chuck core or a pressing roller constituting a jig following an inner peripheral surface or an outer peripheral surface which is a molding reference surface of a tubular body, and a tube end outer peripheral surface or a tube end inner peripheral surface opposite to the reference surface. A grinding device for a pipe end, comprising: a rotary grinding blade for grinding a grinding wheel; and the grinding amount adjusting device according to claim 2 . 5. A positioning roller disposed at the periphery of a jig for regulating the position of an end surface of a tube, and comes into contact with the outer peripheral surface of the tube at a predetermined angle with respect to the axis of the tube. The apparatus for grinding a pipe end according to claim 4 , further comprising: a pipe rotating device provided with a driving roller so as to press the positioning roller while rotating the pipe by the driving roller.