JP2001232541A - Taper machining device for pipe end part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform taper machining inexpensively and accurately without using a lathe eliminating eccentric wear of a grinding face of a grinder performing taper machining when taper-machining an insertion port of a metallic pipe. SOLUTION: This taper machining device comprises a pipe rotation supporting device 4 supporting a pipe 1 rotatably around a shaft 1a, the grinder 2 supported at the attitude where it has eccentric angles θ, α on any face when viewed in a plane and a side for the shaft 1a of the pipe at a pipe end 1b position of the pipe 1 supported by the pipe rotation supporting device 4 and comes into contact with a pipe end part of the pipe due to parallel travel so as to perform taper machining, a sensor 7 arranged in a pipe end part at a peripheral direction position in the reverse direction to the direction of rotation of the pipe from the grinder 2 to detect a taper machining condition, and a controller 9 controlling the operation of the grinder 2 based on signals detected by the sensor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for tapering a pipe end.

[0002]

2. Description of the Related Art A pipe end portion which is inserted with a metal pipe such as a ductile cast iron pipe is tapered on an outer surface of the pipe end.

[0003] The dimensional tolerance of the insertion taper is standardized, and in order to maintain this processing accuracy, processing has conventionally been performed using a lathe apparatus. However, pipes to be processed include small pipes with a diameter of several tens of centimeters and large pipes with a diameter of more than 2 m. A large amount of lathe equipment is required to process all these metal pipes. There was a problem that costly.

On the other hand, as shown in FIG.
a rotatably supported by a support roll 6 around the pipe end 1
It is also conceivable that the grinder 2 supporting the shaft 2a at a taper angle α with respect to b is supported by the support device 3 and moved to the tube end corner 1c to perform taper processing.

This method does not require the use of an expensive device such as a lathe device, and can be applied to metal pipes of various diameters by adjusting the supporting angle and height of the grinder 2. There is an advantage that it can be implemented at very low cost.

[0006]

However, the grinder 2
As the grinding progresses, the grinding surface 2c wears and the diameter r gradually decreases, so that the moving amount t of the grinder 2 gradually changes with the change of the diameter r, and the grinder 2 for the precision grinding is used. There was a problem that it became difficult to manage the amount of movement.

The grinding surface 2 of the grindstone 2d of the grinder 2
Since c is in contact with the corner 1c of the pipe end 1b, the grinding surface 2c tends to wear unevenly as shown by the dotted line in FIG. 10, and if such uneven wear proceeds, the taper processing itself becomes impossible. was there.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to eliminate uneven wear of a polished surface, and to perform accurate tapering at low cost.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a pipe end tapering apparatus for supporting a pipe rotatably around an axis, and a pipe end supported by the pipe rotation supporting apparatus. A grinder that is supported in a position having a declination in any of a plane view and a side view with respect to the axis of the tube at a position, and is supported so as to be capable of being tapered in contact with the tube end of the tube by parallel movement. And a sensor for detecting the amount of taper processing, which is disposed at a pipe end located in a direction opposite to the rotation direction of the pipe from the grinder, and a control device for controlling the operation of the grinder based on a detection signal of the sensor.

Therefore, according to this apparatus for tapering a pipe end, a grinder for making a taper by contacting the pipe end is:
Both the plane and side surfaces have a declination with respect to the pipe axis, so the tapered surface, that is, the grindstone grinding surface of the grinder is in wide contact with the pipe end corner, and the pipe end corner is located at one point of the grinder grinding surface. No uneven wear is caused by contact with

In addition, the grinding state of the grinding surface is not controlled only by the amount of movement of the grinder, but is detected by a sensor, and the grinding state is controlled based on this information. Can do it.

[0012]

Next, an embodiment of the present invention will be described. FIG. 1 is an overall side view of a pipe end tapering device according to an embodiment, and FIG. 2 is a grinder supporting device constituting the tube end tapering device according to the embodiment, which is shown in an upright state. FIG. 3 is a rear view, and FIG. 4 is a plan view.

In FIG. 1, reference numeral 4 denotes a tube rotation supporting device. The pipe rotation support device 4 is configured by arranging rolls 6... 6 that support a metal pipe 1 such as a ductile cast iron pipe from a pipe outer surface in a horizontal posture on a base 5 along an axial direction of the metal pipe. One of these rolls 6 is a drive roll.

The supporting device 3 of the grinder 2 is located at a position lateral to the tube end 1b of the metal tube 1 supported by the tube rotation supporting device 4.
Are provided at an angle α that is equal to the taper angle of the machining tapered surface at the tube end corner 1c.

FIG. 2 shows the support device 3 in a vertical state. A pair of columns 3a, 3a are erected in parallel on a girder 3k, and slide rails 3b, 3b are provided on the side surfaces of the columns 3a, 3a. Are provided along the length direction of the column 3a.

FIGS. 3 and 4 show the slide rail 3b.
As shown in FIG. 7, a bracket 3d is slidably supported along a column 3a via a slider portion 3c, and a grinder 2 is provided from the bracket 3d in a direction perpendicular to the column 3a.
Support substrate 3e is extended.

A beam 3f is installed between the columns 3a and 3a and at the lower end of the slide rail 3b in FIG. 2, and a driving device 3g is installed between the beam 3f and the support substrate 3e. By operating the driving device 3g, the support substrate 3e is caused to reciprocate along the slide rail 3b, whereby the grinder 2 is translated in a constant posture.

As the driving device 3g, an air cylinder or the like which can be easily controlled by a solenoid valve is preferably used. The grinder 2 is provided with a rotating shaft 2a of a grindstone 2d.
Are attached to the support substrate 3e with the mounting bracket 2b so as to have a declination θ with respect to the tube axis 1a in plan view as shown in FIG.

As shown in FIG. 1, the support columns 3a, 3a are inclined to have the inclination angle α by inserting and fixing a wedge-shaped spacer 3h having an inclination angle α equal to the taper angle to the lower surface of the beam 3k. I have.

That is, the shaft 2a of the grinder 2 has a declination of θ with respect to the tube axis 1a in a plan view and α with a side view, and is supported so as to be in contact with the tapered portion of the tube end corner 1c of the metal tube 1. Have been.

Further, as shown in FIG. 5, a tapered surface is formed at a pipe end corner 1c at a position circumferentially away from the grindstone 2d of the grinder 2 in a direction opposite to the rotational direction (arrow A) of the metal tube 1. Is provided with a sensor 7 for detecting the processing state of.

The sensor 7 has the structure shown in FIGS. That is, the frusto-conical roll 7a having a generatrix having an inclination angle α equal to the taper angle to be machined at the pipe end 1b of the metal pipe 1 is allowed to idle on the horizontal rotating shaft 7c via the bearings 7b, 7b. It is pivoted. At one end of the rotating shaft 7c, there is provided a detection roll 7d which rotates in contact with the outer periphery of the metal tube 1, and the rotating shaft 7c is connected to the substrate 7e.
The substrate 7e is rotatably supported in parallel with the tube shaft 1a by bearings 7f, 7f. The substrate 7e is supported by a base 7h via a slide rail 7g so as to be slidable in a direction perpendicular to the rotation shaft.

The frusto-conical roll 7a is brought into contact with the tapered surface 1d by applying a contact pressure, for example, its own weight, so as to be translated in parallel with the progress of the grinding process. When the roll 7a gradually approaches the outer periphery of the tube and the detection roll 7d contacts the outer surface 1e of the tube as shown in the figure, the rotating shaft 7
c is rotated.

As shown in an enlarged view of the partial view of FIG. 6, a pin 7p is protruded from the other end of the rotating shaft 7c, and when the rotating shaft 7c rotates, the limit is pushed by the pin 7p to operate. The switch 7s is provided on the substrate 7e.

Reference numeral 9 denotes a control device of the grinder 2. When the detection information of the sensor 7 is inputted, the driving device 3g is operated to move the support substrate 3e upward and separate the grinder 2 from the tube end 1b to grind. Is to be terminated.

Next, the operation of the taper processing device for the pipe end will be described. First, the metal tube 1 is placed horizontally on the support rolls 6... 6 of the tube rotation support device 4. Next, the inclination angle α of the support 3a of the grinder support device 3 is adjusted by the spacer 3h so as to match the taper angle of the insertion end face of the metal tube 1, and the driving device 3g such as an air cylinder is operated to cause the grinder 2 to move. The supporting substrate 3e is moved down so as to contact the tube end corner 1c of the supporting substrate 3e.

Then, the metal tube 1 is rotated at a predetermined rotation speed and the grinder 2 is driven to rotate to start the taper processing of the tube end corner 1c. The grinding surface of the grinder 2 with respect to the tube end corner 1c of the metal tube 1 is inclined at a taper angle α in a side view with respect to the tube axis 1a, but at the same time, has a declination of θ in a plan view. Therefore, as shown in FIG. 7, as θ increases,
The corner 1c of the pipe end 1b no longer locally contacts the grinding surface 2c of the grindstone 2d, and the edge-shaped extreme uneven wear as shown in FIG. 10 does not occur.

The frusto-conical roll 7a of the sensor 7 is always in contact with the tapered surface 1d due to the mass of the rotating shaft 7c and the substrate 7e. As shown in FIG. 8, the position of the shaft core 7h is high, the detection roll 7d rises from the tube outer surface 1e and does not rotate in contact, and only the truncated conical roll 7a in contact with the tapered surface 1d idles on the rotation shaft 7c.

Therefore, the limit switch 7s is not operated, and the grinding by the grinder 2 is continued. When the grinding proceeds and reaches a predetermined grinding amount, the truncated conical roll 7a descends according to the tapered surface, and the detection roll 7d comes into contact with the tube outer surface 1e as shown in FIG. By this contact, the shaft 7c starts rotating, and the pin 7p pushes the limit switch 7s.

Based on this signal, the control device 9 activates a drive device 3f such as an air cylinder controlled by an electromagnetic control valve, and raises the grinder 2 from the end face of the tube to finish the grinding.

Therefore, even if the grinding surface 2c of the grinder 2 may be worn, regardless of the wear, the processing amount of the tapered surface 1d is checked by the sensor 7, and accurate processing can be performed.

Although there is a deviation X in the circumferential direction between the position detected by the sensor 7 and the grinding position by the grinder 2, as shown in FIG. 5, the operation start timing of the driving device 3f is changed from the detection to the deviation X by sequence control. By delaying the operation by a corresponding time, the ascending position of the grinder 2 can be made coincident with the detected position.

For example, when the rotational peripheral speed of the metal tube 1 is 3000
mm / min, and the sensor 7
Assuming that the distance X to the contact position is 300 mm, the ascending or descending position of the grinder 2 can be made coincident with the detected position by delaying the solenoid valve operation time by 6 seconds by sequence control from the detection of the limit switch signal by the sensor 7. .

[0034]

As described above, according to the apparatus for tapering a pipe end of the present invention, uneven wear of the grinding surface of the grinder due to the deviation of the grinding surface of the grinder with respect to the pipe end can be prevented. Can be tapered, and
Even if the grinding surface of the grinder wears and the diameter of the grinding surface of the grinder changes, the taper processing amount is checked by the sensor, so accurate checking is possible, and high-precision taper processing of the pipe end without using expensive lathe equipment. Becomes possible.

By moving the grinder in parallel, it is possible to apply a pipe end taper processing apparatus to a metal pipe having an arbitrary diameter, and it is possible to process metal pipes of various diameters with one apparatus. It has the effect that it can be implemented at low cost.

[Brief description of the drawings]

FIG. 1 is an overall side view of a pipe end tapering apparatus according to an embodiment.

FIG. 2 is a partial side view showing only the grinder support device in an upright state.

FIG. 3 is a partial rear view of the same.

FIG. 4 is a partial plan view of the same.

FIG. 5 is a plan view of a main part of the pipe end tapering apparatus according to the embodiment.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

FIG. 7 is an explanatory perspective view of a main part showing a contact state between a grinder and a pipe end;

FIG. 8 is an explanatory side view showing an operation state of a sensor.

FIG. 9 is an explanatory side view of a conventional example.

FIG. 10 is a main part enlarged side view for explaining a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal pipe, such as a ductile cast iron pipe, etc. 1a Pipe shaft 1b Pipe end 1c Pipe end corner 1d Tapered surface 2 Grinder 2a Grinder rotating shaft 2b Mounting bracket 3 Grinder support device 3a Strut 3b Slide rail 3c Slider portion 3d Bracket 3e Grinder Support substrate 3f Beam member 3g Driving device 3h Spacer for inclining support column 4 Pipe rotation support device 5 Base 6 Support roll 7 Grinding surface sensor 7a Truncated cone roll 7b Bearing 7c Rotating shaft 7d Detecting roll 7e Substrate 7f Bearing 7g Base 7p Pin 7s Limit switch 9 Grinder control device

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 3C029 BB01 3C034 AA13 BB15 BB71 CA05 CB01 3C049 AA03 AA11 AA13 AB01 AC02 BA01 BB03 BC02 CA01 CB01 CB03

Claims (1)

[Claims] 1. A tube rotation supporting device that rotatably supports a tube around an axis, and a tube end position of the tube supported by the tube rotation supporting device, which is either a plan view or a side view with respect to the axis of the tube. A grinder that is supported in a posture having a declination also in a plane, and is supported by a parallel movement so as to be capable of being tapered by being in contact with the pipe end of the pipe; and a pipe end located in a direction opposite to the rotation direction of the pipe from the grinder. And a control device for controlling the operation of the grinder in accordance with a detection signal of the sensor, the taper processing device being provided in the section.