JPH07237072A - Pipe outer peripheral machined surface centering method and device therefor - Google Patents

Abstract

PURPOSE:To rationalize the centering of the pipe outer peripheral machined surface of a deformed pipe or the like by temporarily placing a pipe body on a pallet surface plate, horizontally in a specified state, inserting a centering jig, fitted to a layout machine, into the pipe body, and adjusting in a specified method so as to equalize the contact pressure between each contact terminal of the centering jig and the inner surface of the pipe body. CONSTITUTION:A pipe body T is temporarily placed on a surface plate B, facing the tool rest of a NC machine, horizontally with the machined surface opened in the reverse direction to the tool rest. A layout machine is fitted opposedly to the opened face of the pipe body T, and a centering jig 2 is fitted to the center thereof. The contact terminals 28 of four linear gage sensors 21 of the centering jig 2 are contracted by pushing and inserted into the end face opening. Expansion-contraction is then released to bring each contact terminal 28 into pressure contact with the inner peripheral surface, and the layout machine 1 is put in three-dimensional motion so as to equalize the contact pressure of each contact terminal 28 for position adjustment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a centering device and its method,
Particularly, the present invention relates to an apparatus and a method most suitable for centering in processing the outer peripheral surface of a tubular body such as a deformed tube having a limited axial precision because it is not a straight tube.

[0002]

2. Description of the Related Art The need to machine the outer peripheral surface of a tubular body over a certain range is encountered in various cases. For example, a groove process in which an end face of a steel pipe is obliquely cut to form a V-shaped or U-shaped groove for welding, a centrifugal cast iron pipe, or a deformed pipe is joined with another pipe to form a pipe path. Therefore, there are a wide variety of modes such as an insertion process in which the insertion port of the tubular body is processed over a certain length. In this case, if the pipe body is a standard steel pipe that has been mass-produced at a steel factory, such as extrusion and drawing, the roundness of the pipe is maintained accurately, so there is no special problem and the pipe axis is automatically detected. Although it can be processed continuously by the processing means that works in conjunction with, it can be said that the steel plate was plastically deformed by a bending roller, etc., and formed into a desired size and shape, a large diameter welded steel pipe, and even though it was manufactured for mass production. With respect to the tubular body of the cast product in which some variation in the size and shape is unavoidable, the procedure of centering cannot be omitted in order to absorb the variation and perform proper processing.

Since there are various differences between the centering method of the pipe body and the apparatus therefor depending on the type of the pipe itself and the purpose of processing,
Generally speaking, even if there is some excellent conventional technology,
There is a feature that it is almost impossible to divert if the pipe type is different. For example, in the case of a deformed pipe, the axis of the pipe is kept horizontal on the centering surface plate, and the end face of the outer peripheral surface of the workpiece to be opened is placed parallel to the tool post for machining.
Considering that this end face is vertical, it is used as a temporary reference plane, and temporary centering is performed by making full use of a toescan or a dial gauge. Roughing is started based on this centering, and in the middle of the progress of processing, the processing is interrupted and the level difference between the as-cast outer peripheral surface and the processed surface is checked, and it is partially uneven. Or, if it is expected that the cutting amount will locally become excessive and the wall thickness will become insufficient if it is machined as it is, it is inevitable to perform a two-step procedure of performing centering again and correcting. If such a work procedure cannot be avoided, even if an attempt is made to reduce the processing time and save labor by adopting a high-performance NC processing machine for the processing itself, the setup procedure before that will become a bottleneck in the equipment. It becomes difficult to fully utilize the function, and eventually it becomes the biggest obstacle to the rationalization of machining.

Such inconvenient centering and inefficient machining process that is forced to do so are due to the fact that the temporary standard itself that the machined end surface of the deformed pipe is always perpendicular to the pipe axis is unreliable. This is because the outer peripheral surface of the deformed pipe is divided into an upper mold and a lower mold, which are then molded, and then molded by a mold in which they are integrated together. Since there are many complicated and individually changing factors such as errors when stacking molds, dimensional errors of cores, tilting when packing cores, irregular warpage during solidification, deformation, etc. This is because it is difficult to guarantee that the end surface of the deformed pipe as a product and the pipe axis are always in an accurate orthogonal relationship. This is an example, but in the centering of the pipe body, in addition to the centering in the usual sense of matching the center of the outer peripheral surface of the pipe with the center of the tool post for processing, the processing is performed to a certain length in the axial direction. When it is carried out over a period of time, it is indispensable to make an adjustment for maintaining an accurate right angle relationship between the pipe outer peripheral processed surface and the pipe axis. Many of the solutions to such problems cannot be found even in the conventional techniques relating to centering, which have been proposed many times.

Japanese Patent Publication No. 4-66664 shown in FIG. 4 is a centering device for machining a groove for welding on a pipe end face, and a machined face of a pipe body at a position facing a rotating swivel M. The centering metal fitting 100 is composed of a tubular body supporting base 101 and a pair of V-blocks, which are slidably supported on the tubular body supporting base 101 and face each other so as to face each other, and a pinching prevention metal fitting 102. If the center of the tubular body and the center of the swivel plate are made to coincide with each other by the movement of the pinching stopper, one requirement for centering for machining in the three directions of X, Y, and Z is satisfied. Next, the centering movable mechanism 200 is installed at a certain distance, and this mechanism also has a support tool 20 for fixing the tube body by sandwiching it with a V block.
1, an air caster 202 for raising and lowering the support, and an induction motor (not shown) for moving the support in a direction perpendicular to the plane of the drawing. That is, it is stated that the operation of this device enables the centering of the end surface of the tubular body, which is the machined surface, with respect to the rotation of the blade, and the correction of the tilt angles θ and φ in the axial direction, thereby achieving accurate centering.

[0006]

There are many types of pipes to be centered, and even if a device is effective for a special case, it can be applied to other cases. Not necessarily. Rather, it is often more effective to solve the problem by developing a device unique to each product type on a case-by-case basis. Even with the cited prior art, when the pipe body is a large welded steel pipe and various types of small quantity products with a limited number of processes, the benefits are clearly expected compared to the conventional method and a certain evaluation can be performed. However, when the centering target is not a straight pipe but a deformed pipe with an unstable shape, and a large number of centering pipes are produced in a mass-produced product, it is equipped with a function that can continuously handle the work flow. It is hard to say that

[0007] Further, in the essence of deformed pipes that are in mass production, when it is intended to introduce an automatic processing machine in order to automate the processing itself in the same manner as casting and to continuously and efficiently flow it, NC processing machines etc. Since it is usually equipped with a centering function that matches the core of the turret and the core of the outer peripheral surface of the pipe, if you use that function, the conditions are completely different from the cited prior art, and the weight It must be said that a huge drive for raising and lowering objects will be lost too much. The subject of the present invention is not centering between the tool and the pipe outer peripheral machining surface, but corrects the fluctuation of the pipe outer peripheral machining surface and the axis to an accurate posture, and properly performs the peripheral machining over a certain length. The problem is centering in order to improve the appearance value and dimensional accuracy of products.

In order to solve the above-mentioned problems, the present invention is directed to processing the outer circumference of a pipe, which has a different caliber in size and is carried in a large amount, especially in an unstable shaped product such as a deformed pipe. An object of the present invention is to provide a method for centering and correcting a correct relationship of a tube axis with respect to a surface, and an apparatus therefor.

[0009]

A method of centering a machined surface of a pipe according to the present invention includes a pipe of a pipe body T on a pallet surface plate P whose position can be freely changed on a surface plate B of an NC processing machine. From the center of the centering jig 2 attached to the layout machine 1 facing the opening surface, the axis A is temporarily placed horizontally, and the end surface of the outer peripheral surface to be machined is temporarily placed at a position opening in the opposite direction facing the tool rest. Four linear gauge sensors 2 that evenly project in the circumferential direction
After the contact terminals 28 at the tip of No. 1 are compressed and inserted into the opening surface of the pipe body, the compression is released to bring the respective contact terminals 28 into pressure contact with the inner surface of the pipe, so that the contact pressure becomes even. As described above, the layout machine 1 is three-dimensionally moved to adjust the position of the center of the centering jig, and the linear gauge sensor 21 is advanced to the inside of the pipe in the pipe axis direction while maintaining the posture, and the adjustment is performed. The above-mentioned problem was solved by tilting the tube body and adjusting the direction of the tube axis so that the later equal relationship is maintained.

Further, as an apparatus used only for carrying out the above-mentioned method, the tool tip of the NC processing machine and the surface plate B are opposed to each other, and the central tip is vertically and horizontally directed to the opposite surface plate side surface. The layout machine 1 for movably positioning the attachment mounting portion 11 is traversably mounted, and the linear gauge sensor 21 is movably fitted into the attachment mounting portion 11 at the distal end in the circumferential direction. The above-mentioned problems were solved by the mechanism in which 22 is engaged.

More specifically, in this structure, the centering jig 2
Is an attachment main body 22 composed of an annular circumferential portion 23 and a straight portion 24 which divides the circumference into four and intersects in a cross shape,
A linear gauge sensor 21 mounted on a mounting member 26 that slidably slides in a sliding groove 25 cut in the longitudinal direction of the linear portion 24, and the linear gauge sensor 21 and the spindle 27 are telescopically connected via a spindle 27. An embodiment in which the roller probe 28 is used as the contact terminal is very preferable.

[0012]

[Function] In the NC processing machine, the turret and the layout machine 1 face each other with the fixed surface plate B sandwiched therebetween, and the pallet surface plate P mounted on the surface plate B can be freely moved back and forth, right and left on the surface plate B. You can change the position. A tubular body T is temporarily placed laterally on the pallet surface plate P, its axis is oriented in the horizontal direction, and the pipe outer peripheral processing surface is opened in the direction opposite to the tool rest. In order to place the pipe on the pallet surface plate P, it is usual to wind a wire rope around the outer periphery of the pipe to be processed and move it from a standby position. In that state, hang it down with both ends hooked on a hook of a hoist or a crane, loosen the wire rope and transfer the weight onto the surface plate. As shown in FIGS. 3 (A) and 3 (B), the centering jig supported by the layout machine 1 approaches the end surface S of the pipe outer peripheral processing surface which is opened in this posture, and presses the contact terminal 28 at the tip. The end face is pushed down to enter the inside, and when the contact terminal 28 is opened inside, the tip comes into pressure contact with the inner circumference of the end face. The position of the attachment body that supports the linear gauge sensor 21 is adjusted so that the contact pressure at the tip is equal at any contact point, and in the same state, the attachment body supporting the linear gauge sensor 21 is directed toward the pipe axis in the direction of the pipe axis. enter in.

If the tube axis is not exactly horizontal with respect to the surface plate, the contact pressures of the linear gauge sensors 21 once adjusted should be unequal to each other again. Only the length of the mouth, that is, the processing length, is measured at the point where it reaches the inside Q of the pipe, and if the pressure at each terminal becomes uneven, the pipe T itself is tilted so that the whole is matched again. Adjust the direction of. That is, specifically, hoist the wire rope as it is slung, and hang it at an appropriate place with a spacer etc.
By adjusting the inclination of the tube axis on the surface plate, it is possible to easily control the posture of the deformed tube which is heavy and lacks stability in shape.

[0014]

1 (A) and 1 (B) are a front view and a side view of an embodiment of the present invention, and FIG. 2 is an overall side view of the present embodiment.
Describing from the overall arrangement of FIG. 2, although the tool rest of the NC processing machine is omitted in the figure, it is located on the right side of the figure.
There is a surface plate B fixed on the ground in front of the turret,
On this surface plate B, the pallet surface plate P can move forward, backward, leftward and rightward with the tubular body T placed thereon. The tube body is a deformed tube in the example of this figure, and the opening is the socket facing the front,
An opening that is laterally opened is the outer peripheral processed surface of the pipe.

The layout machine 1 is mounted at a position opposed to the machined surface of the pipe, that is, in the opposite direction with the surface plate of the tool rest (not shown) interposed. The layout machine 1 is fitted on a track which is fixed to the side surface of the surface plate B and projects laterally from the end surface of a base 12 so as to traverse (direction perpendicular to the plane of the drawing). At the center of the layout machine 1, there is an attachment mounting portion 11. The attachment mounting portion meshes with an arm 13 in the horizontal direction and is movably supported by its operation, and vertically engages with a column 14 to move up and down by its rotation. Since it is freely supported, it is possible to freely move the three-dimensional position of X, Y, and Z along with the traverse on the orbit.

As shown in FIG. 1, the centering jig 2 is mounted on the attachment mounting portion 11 at the center of the layout machine 1. The centering jig is composed of an attachment main body 22 formed of an annular circumferential portion 23, a straight line portion 24 that divides the annular shape into a cross shape and connects the annular shape, and a linear gauge sensor 21 attached to the attachment main body. . A long sliding groove 25 is cut in the linear portion of the attachment body in the direction of the wire axis, and a fitting 26 of the linear gauge sensor 21 is fitted into this groove. Since the deformed pipe has various shapes and diameters based on the regulations of the Water Works Association and JIS, it is necessary to prepare several types of attachment bodies to cope with the variations, but it is also common for the same attachment body to be shared. It is economical and desirable to set the position of the linear gauge sensor 21 in the sliding groove so as to advance and retreat so that the linear gauge sensor 21 can be adjusted to some difference in diameter.

Mounting bracket 2 for the linear gauge sensor 21
The linear gauge sensor 21 attached to the roller 6 is connected to the roller gauge 28 through a roller gauge 28 and a spindle 27 at the tip in the circumferential direction. The spindle 27 has an expansion and contraction function of advancing and retracting the terminal at the tip, and when the release is effective, it is reduced to about half of the stroke, and when opened, it extends and presses against the inner surface of the tubular body. Since this contact pressure is displayed on the display unit of the linear gauge sensor 21, it is possible to show the state in which the distances from the center of the attachment body at each point are unequal. Since the display part has a reset function, if the terminals are evenly contacted with the inner surface of the pipe by adjusting the position of the attachment body on the first end face, the contact pressure of each terminal can be applied to any linear gauge sensor. However, it indicates 0, which is advantageous because there is no mistake in checking the progress of the position and the fluctuation of the contact state thereafter.

[0018]

Industrial Applicability As described above, the present invention provides a core for a machined outer peripheral surface of a tubular body of any shape, including a deformed tube that is heavy and has an unstable shape, and requires sufficient skill to adjust the position. Appropriate information can be provided so that accurate processing can be easily performed by easily responding to deformation such as three-dimensional distortion, bending, and twisting not only on one side of processing but also on the processing progressing direction, in particular, in the direction of processing progress. As a result, the most effective NC machining function for rationalizing the machining itself can be exhibited 100%, and in combination with the centering mechanism of the NC machining machine itself, rationalization of deformed pipes is extremely difficult. It was proved that the obstacle that had been blocked before the end face processing (insertion processing) that had been done was removed and that it made a great contribution to drastic improvement in efficiency.

[Brief description of drawings]

FIG. 1 is a front view (A) and a side view (B) of an embodiment of the present invention.

FIG. 2 is a side view of an entire embodiment of the present invention.

FIG. 3 is a front view (A) and a side view (B) illustrating an operation of the present invention.

FIG. 4 is a front view showing a conventional technique.

[Explanation of symbols]

 1 Layout machine 2 Centering jig 11 Attachment mounting part 12 Base 13 Arm 14 Column 21 Linear gauge sensor 22 Attachment main body 23 Circumferential part 24 Straight part 25 Sliding groove 26 Mounting bracket 27 Spindle 28 Contact terminal (roller probe) B Surface plate P Pallet surface plate T Tube body (deformed tube) A Tube axis

Claims (3)

[Claims] 1. A pipe axis A of a tubular body T is horizontally placed on a pallet surface plate P whose position can be freely changed on a surface plate B of an NC processing machine, and an end face of an outer peripheral surface of a workpiece is opposed to a tool rest. To the tip of four linear gauge sensors 21 that are evenly placed in the opposite direction and that evenly project in the circumferential direction from the center of the centering jig 2 attached to the layout machine 1 facing the opening surface. After pressing a certain contact terminal 28 and inserting it into the opening surface of the tubular body, the contact terminal 28 is released by releasing the pressing.
Is pressed against the inner surface of the pipe, the layout machine 1 is moved three-dimensionally so that the contact pressure becomes uniform, and the center position of the centering jig 2 is adjusted. 21 is advanced into the pipe body in the pipe axis direction and the pipe body is tilted to adjust the pipe axis direction so as to maintain the adjusted equal relationship. . 2. A centering device for a machined surface of a pipe outer periphery by an NC processing machine, wherein the tool tip of the NC processing machine and a surface plate B are opposed to each other and face the opposite side surface of the surface plate. A cross-shaped attachment body 22 in which a layout machine 1 for movably positioning the attachment mounting portion 11 is movably mounted, and linear gauge sensors 21 are movably fitted to the attachment mounting portion 11 at the distal ends in the circumferential direction, respectively. A centering device for a machined outer peripheral surface of the pipe. 3. The attachment main body 22 according to claim 2, wherein the centering jig 2 comprises an annular circumferential portion 23 and a straight portion 24 which divides the circumference into four and intersects in a cross shape, and the straight portion 24. As a linear gauge sensor 21 attached to a fitting 26 that slidably and slidably slides in a sliding groove 25 cut in the longitudinal direction, and a contact terminal that is elastically connected to the linear gauge sensor 21 via a spindle 27. 1. A centering device for a machined outer peripheral surface of a pipe, characterized by comprising the roller measuring element 28.