JP2005001060A - Grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding device with excellent portability capable of grinding an end face of a flange at an end part of a pipe body with high accuracy. <P>SOLUTION: This grinding device 1 has a distal end part 3 inserted into the pipe body 50 to expand and contract in a radial direction. The device 1 is provided with a shaft body 4 fixed to the pipe body 50 by expanding the distal end part 3 to be brought into pressure contact with an inner peripheral surface of the pipe body 50, and gear 6 and grinding disk 7 integrally and axially rotating, while being energized by a compression coil spring 9 toward the end face 51a of the flange via a bearing sleeve 5 in relation to the shaft body 4. A grinding part 7b formed on an end face 7a of the grinding disk 7 axially rotates, while being brought into pressure contact with the end face 51a of the flange by energizing force of the compression coil spring 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grinding apparatus for grinding a flange end face at an end of a pipe used as piping of various plants.
[0002]
[Prior art]
In general, in a flange serving as a joint between tubular bodies, high precision flatness is required for the flange end surfaces serving as connecting surfaces so that the carrier fluid does not leak from the piping during operation of the plant. For this reason, the flange end face of the tubular body is ground before the plant is laid. In particular, when the flange is not integrally formed with the pipe body but is originally formed as a separate body by welding, the flange itself is deformed by the heat effect during welding. Since the end face is distorted (about 0.1 to 0.3 mm), grinding is indispensable.
[0003]
As a conventional grinding apparatus for grinding the flange end face of the tubular body, there is a so-called surface grinder. The grinding apparatus generally includes a support base that supports the pipe body horizontally or vertically, and a grindstone disk that rotates while being pressed against the flange end surface of the pipe body supported by the support base. The end face of the flange is ground by the outer peripheral face or the end face (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP 7-314303 A (page 2-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, when the plant is actually laid, the positions of the pipes may be finely adjusted at the laying location, and in this case, grinding of the flange end face is required again. In addition, after plant installation, the flatness of the flange end face gradually deteriorates over a long period of operation (especially in the case of a tube integrated with a flange by welding, the residual stress is released over time. Therefore, since the flatness of the flange end face is remarkably deteriorated), the pipes are appropriately disassembled in maintenance repair, and the flange end face must be ground again.
[0006]
However, since the above-described conventional grinding apparatus is primarily intended for grinding the tube in the material stage before being transported to the plant laying place, it is generally installed as a part of the production line in the factory of the material manufacturer. Since it is large and large, it is by no means excellent in portability. Therefore, the conventional grinding apparatus is not suitable for grinding processing at a plant laying location such as the fine adjustment and maintenance repair at the time of laying the plant, and it is difficult to deal with it efficiently.
[0007]
Then, this invention is made | formed in view of said problem, and it aims at providing the grinding apparatus excellent in the portability which can grind the flange end surface of the edge part of a pipe body with high precision. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a grinding apparatus according to the present invention is a grinding apparatus for grinding a flange end surface of an end portion of a tubular body, and has a distal end portion that is inserted into the tubular body and expands or contracts in the radial direction. Is expanded and pressed against the inner peripheral surface of the tubular body, and the shaft body is fixed to the tubular body, and the shaft rotates while being urged by the spring body toward the flange end surface with respect to the shaft body. And a rotating body having a grindstone portion pressed against the flange end face by the biasing force of the spring body.
[0009]
Thus, when grinding the flange end face, the shaft body, that is, the grinding device is fixed to the tube body by the extension of the tip of the shaft body inserted into the tube body, and the grindstone portion of the rotating body is fixed to the shaft body. The shaft rotates while being pressed against the flange end face of the tube by the biasing force of the spring. In this way, the flange end face is uniformly ground by the grindstone. On the other hand, after the grinding is finished, the shaft body, that is, the grinding device is fixed to the tube body by contraction of the tip of the shaft body, and the grinding device including the rotating body is removed from the tube body. The grinding device thus removed can be easily carried because of its small size.
[0010]
Here, as a configuration suitable for the practicality of the expansion / contraction mechanism of the tip portion of the shaft body, the tip portion is a spherical body that can be elastically deformed, and the shaft center of the shaft body is tapered within the tip portion. It is preferable that a through hole is formed, and a rod body that advances and retreats in the through hole is provided. As a result, the tip portion itself is elastically expanded by advancing the rod body to the tapered portion in the tip portion in the through hole, and the surface thereof is uniformly pressed against the inner peripheral surface of the tube body, while the rod body Can be retracted to the initial state by withdrawing from the taper.
[0011]
In addition, the grinding wheel part gradually wears as grinding is repeated, but this wear is reflected in the grinding accuracy of the flange end face, so it is important to wear uniformly so that the wear does not progress locally. . Considering this, a plurality of the grindstone portions extend from the inner peripheral edge to the outer peripheral edge on the end face of the rotating body, and each of the grindstone portions expands in the circumferential direction from the inner peripheral edge to the outer peripheral edge. It is preferable. As a result, the outer peripheral edge side of each grindstone part appears to bear a larger grinding area on the flange end face than the inner peripheral edge side (the grinding area is proportional to the circumferential length, ie, the diameter). Since it becomes possible to suppress wear by bearing in a wide whetstone region in the direction, wear is almost uniform for each whetstone portion as a whole.
[0012]
More preferably, when the width of the grinding wheel region in the circumferential direction in each grindstone portion is proportional to the diameter, the entire grindstone portion is uniformly worn. It is good to extend radially with respect to the axis of the body.
[0013]
Further, when chips generated by grinding accumulate on the grindstone, there is a risk of degrading the quality of the flange end face to be ground. Therefore, for the purpose of blowing away the chips from the grindstone part, the shaft body is formed with a flow hole for flowing the compressed gas, and the flow hole is directed toward the inner peripheral edge of the end face of the rotating body. It is preferable that it is open.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a first embodiment of the present invention will be described. 1A and 1B are longitudinal sectional views of a grinding apparatus according to a first embodiment. FIG. 1A shows a state during non-grinding, and FIG. 1B shows a state during grinding. FIG. 2 is a plan view of a grindstone disk in the grinding apparatus, and FIG. 3 is an enlarged longitudinal sectional view showing a main part of the grinding apparatus corresponding to the AA cross section of FIG. In addition, the same code | symbol is attached | subjected to the part of the same name in a figure, and the overlapping description is abbreviate | omitted. The same applies to the second embodiment to be described later.
[0015]
As shown in FIG. 1, the grinding device 1 is suitable for grinding a flange end surface 51 a of a flange 51 that is integrated with, for example, an end of a pipe body 50 by welding. 3, a bearing sleeve 5 coaxially inserted in the shaft portion 2 of the shaft body 4, a gear 6 coaxially inserted in the bearing sleeve 5, and the bearing sleeve 5. The grindstone disc 7 fitted coaxially and fixed to the end face of the gear 6 on the end portion 3 side of the shaft body 4 with a bolt or the like, and the end portion 3 of the shaft body 4 and the end face 7a of the grindstone disc 7 are opened. A case 8 having an opening, a compression coil spring 9 that is a spring body that urges the bearing sleeve 5 toward the distal end portion 3 of the shaft body 4, a drive motor 10 that drives the gear 6 to rotate, and It has.
[0016]
More specifically, the shaft body 4 is formed of an elastically deformable resin or the like, and the tip portion 3 thereof has a spherical shape having a surface slightly smaller than the inner diameter of the pipe body 50 to be ground. It has become. Further, a through hole 11 having a tapered tapered portion 11 a that penetrates from the shaft portion 2 to the distal end portion 3 and is tapered in the distal end portion 3 is formed in the shaft center of the shaft body 4. A rod body 12 is provided that can move forward and backward while sliding in the axial direction. Thereby, the front-end | tip part 3 itself is expanded radially with respect to the axial center of the shaft body 4 by advancing the rod body 12 to the taper part 11a of the through-hole 11, On the other hand, the rod body 12 is taper part. By retracting from 11a, it is contracted to the initial state. Further, the shaft body 4 is fixed integrally with the case 8 by a nut 13.
[0017]
The bearing sleeve 5 is supported so as to be movable in the axial direction along the shaft portion 2 of the shaft body 4 while receiving the urging force of the compression coil spring 9 toward the distal end portion 3 side of the shaft body 4. These are rotatably supported while restraining the movement of the grindstone disk 7 in the axial direction together with the gear 6. In other words, the gear 6 and the grindstone disc 7 become an integral rotating body and rotate around the bearing sleeve 5 while receiving the biasing force of the compression coil spring 9 via the bearing sleeve 5. The biasing force of the compression coil spring 9 is adjusted by an adjusting nut 14 screwed into the shaft portion 2 of the shaft body 4.
[0018]
As shown in FIGS. 2 and 3, a grindstone portion 7 b for grinding the flange end surface 51 a of the tube body 50 is formed on the end surface 7 a of the grindstone disc 7, that is, the surface located on the tip portion 3 side of the shaft body 4. Has been. The grindstone portion 7b is made of, for example, uniformly bonded diamond abrasive grains, and the formation region of the grindstone portion 7b (hereinafter sometimes referred to as “grindstone region”) is radial from the inner periphery to the outer periphery of the end surface 7a. And the width in the circumferential direction of each grindstone portion 7b is in proportion to the diameter (see the hatched portion in FIG. 2). That is, each grindstone portion 7b is widened in the circumferential direction from the inner peripheral edge to the outer peripheral edge.
[0019]
The reason why the grindstone portion 7b is formed in this way will be described below. In general, the grindstone 7b gradually wears as the grinding is repeated, but this wear reflects the grinding accuracy of the flange end face 51a, so it is important to wear uniformly so that the wear does not progress locally. It is. However, the outer peripheral edge side of each grindstone portion 7b has a longer circumferential length proportional to the diameter than the inner peripheral edge side, and seems to bear many grinding areas of the flange end face 51a. I can say that. Therefore, the outer peripheral side of each grindstone portion 7b is wider in the circumferential direction than the inner peripheral edge side, and wear is suppressed by bearing a large grinding region of the flange end face 51a in this wide grindstone region, thereby each grindstone portion 7b. As a whole, local wear does not occur and almost uniform wear occurs. If it does so, it will lead to the maintenance of the grinding precision of the flange end surface 51a as a result. In particular, in this embodiment, since the width of the grinding wheel region in the circumferential direction in each grinding wheel portion 7b is in a state proportional to the diameter, each grinding wheel portion 7b as a whole can uniformly bear the grinding region, resulting in uniform wear. The flange end surface 51a can be ground with higher grinding accuracy.
[0020]
Returning to FIG. 1, the description will be continued. The drive motor 10 is a general small motor, and is fixed to the outer surface of the case 8 with a bolt or the like via a support block 15. A main shaft 16 of the drive motor 10 passes through the case 8 while being supported by a pair of bearings 17 fixed to the case 8 so as to be able to rotate smoothly, and a pinion gear 18 at the tip thereof meshes with the gear 6. is doing. A collar 19 is inserted and fixed between the bearings 17 that are the middle stage of the main shaft 16, and the movement of the collar 19 between the bearings 17 is restricted to prevent the main shaft 18 from coming off. Has been.
[0021]
Thus, the grinding apparatus 1 itself is much smaller than the conventional grinding apparatus, and therefore can be easily carried to a plant laying place, and can be said to be excellent in portability.
[0022]
Next, a grinding procedure by the grinding apparatus 1 having such a configuration will be described with reference to FIG. First, in the initial state, as shown in FIG. 1A, the rod body 12 is in a state of retreating from the tapered portion 11 a of the through hole 11, and the distal end portion 3 of the shaft body 4 is slightly smaller than the inner diameter of the tube body 50. Shrink to diameter. Further, the gear 6 and the grindstone disc 7 together with the bearing sleeve 5 are in a state of being urged by the compression coil spring 9 toward the distal end portion 3 side of the shaft body 4. In this state, the grinding device 1 is carried around.
[0023]
When grinding the flange end surface 51a of the tubular body 50, the biasing force of the compression coil spring 9 is applied while inserting the distal end portion 3 of the shaft body 4 in the grinding apparatus 1 into the tubular body 50 as shown in FIG. The grindstone 7b existing on the end surface 7a of the grindstone disc 7 is pressed against the flange end surface 51a. In this state, the rod 12 is advanced to the tapered portion 11 a of the through hole 11. If it does so, the front-end | tip part 3 of the shaft body 4 will elastically expand to radial direction, and it press-contacts to the internal peripheral surface of the pipe body 50, and, thereby, the shaft body 4, ie, the grinding device 1, is fixed with respect to the pipe body 50. On the other hand, in this state, the grindstone 7b is pressed against the flange end surface 51a by the urging force of the compression coil spring 9.
[0024]
Subsequently, the drive motor 10 is driven to rotate the pinion gear 18 of the main shaft 16, and the grindstone disc 7 rotates together with the gear 6 engaged with the pinion gear 18 with respect to the bearing sleeve 5, that is, the shaft body 4. . Then, since the grindstone portion 7b of the grindstone disk 7 rotates while being pressed against the flange end surface 51a, the flange end surface 51a is uniformly ground by the grindstone portion 7b. Here, for fixing the grinding device 1 to the tubular body 50, the distal end portion 3 of the shaft body 4 is pressed against the inner peripheral surface of the tubular body 50. As a result, the inside of the tubular body 50 is blocked. As a result, the chips generated by grinding do not inadvertently enter the pipe body 50, and contamination in the pipe body 50 is prevented.
[0025]
After the grinding is finished, the rod body 12 is retracted from the tapered portion 11a of the through hole 11, and the tip portion 3 of the shaft body 4 is contracted. Thereby, fixation of the shaft body 4 with respect to the pipe body 50, ie, the grinding device 1, is cancelled | released. Then, the grinding apparatus 1 is removed from the tube body 50 and completed.
[0026]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged longitudinal sectional view showing a main part of the grinding apparatus according to the second embodiment. The feature of the second embodiment is that the grinding apparatus 1 of the first embodiment is designed to positively remove chips generated by grinding from the grindstone portion 7b. This is because if chips are accumulated on the grindstone 7b, the quality of the flange end face 51a to be ground may be reduced.
[0027]
Therefore, as shown in FIG. 4, the shaft body 4 is formed with a flow hole 20 that penetrates from the shaft portion 2 to the tip portion 3 and flows a compressed gas such as compressed air. One end 20a of the flow hole 20 opens toward the inner peripheral edge of the end surface 7a of the grindstone disk 7 (the opening 3 is provided at the tip 3 in FIG. 4), and the other end is not shown. It is connected to a compressed gas supply pump.
[0028]
According to such a configuration, during grinding, the compressed gas supplied from the compressed gas supply pump is discharged from the one end 20 a through the flow hole 20, and from the inner peripheral edge of the end surface 7 a of the grindstone disc 7 between each grindstone part 7 b. To be introduced. And this introduced compressed gas is discharged | emitted outside from the outer periphery of the end surface 7a through between each grindstone part 7b (refer the continuous line arrow in FIG. 4). Therefore, the chips existing between the grindstone portions 7b are blown off by the introduced compressed gas and removed to the outside, so that there is almost no accumulation of the chips on the grindstone portions 7b, and the quality of the flange end face 51a to be ground. Reduction is prevented.
[0029]
In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, as shown in FIG. 5, the grinding wheel area of each grinding wheel portion 7 b formed on the end surface 7 a of the grinding wheel disc 7 is widened in the circumferential direction from the inner peripheral edge to the outer peripheral edge. It may be formed in a spiral shape. Furthermore, instead of the compression coil spring 9, a spring body such as a disc spring may be applied.
[0030]
In addition, the shaft body 4 can exhibit the above function when the tip portion 3 is expanded or contracted at least in the radial direction. Therefore, considering the rigidity, the tip portion 3 formed of resin or the like on the shaft portion 2 formed of metal or the like. It may be bonded and integrated. Furthermore, the shape of the distal end portion 3 is such that the diameter of the base portion is larger than that of the shaft portion 2 and decreases toward the distal end as long as it expands in the radial direction and comes into pressure contact with the inner peripheral surface of the tube body 50. For example, it may be a truncated cone shape.
[0031]
【The invention's effect】
As described above, according to the grinding device of the present invention, in the grinding device for grinding the flange end face of the end portion of the tubular body, the distal end portion is inserted into the tubular body and expands / contracts in the radial direction. Is expanded and pressed against the inner peripheral surface of the tubular body, and the shaft body is fixed to the tubular body, and the shaft rotates while being urged by the spring body toward the flange end surface with respect to the shaft body. A rotating body having a grindstone that is pressed against the flange end face by the biasing force of the spring body, so that when the flange end face is ground, the tip of the shaft inserted into the tube body is expanded. A shaft body, that is, a grinding device is fixed to the tube body, and the grindstone portion of the rotating body is pressed against the flange end surface of the tube body by the urging force of the spring body against the shaft body, so that the shaft can be rotated. Uniformly grinds the flange end face Rukoto can. Moreover, since the grinding device itself including the rotating body is small, after the grinding is finished, the shaft body, that is, the grinding device is not fixed to the tubular body by the contraction of the distal end portion of the shaft body and is removed from the tubular body. Easy to carry around.
[0032]
Here, the tip portion is a spherical body that can be elastically deformed, and a shaft hole that is tapered in the tip portion is formed in the shaft center of the shaft body, and a rod body that advances and retreats in the through hole is provided. The tip part itself is elastically expanded by advancing the rod body to the tapered part in the tip part in the through hole, and the surface thereof is evenly pressed against the inner peripheral surface of the tubular body, By retracting the rod body from the tapered portion, the rod body can be contracted to the initial state, so that an expansion / contraction mechanism of the tip end portion of the shaft body suitable for practical use can be obtained.
[0033]
Further, when the grindstone portion extends a plurality from the inner peripheral edge to the outer peripheral edge on the end surface of the rotating body, and each of the grindstone portions is widened in the circumferential direction from the inner peripheral edge to the outer peripheral edge, The grinding wheel part gradually wears as grinding is repeated, but the outer peripheral edge side of each grinding wheel part bears a larger grinding area on the flange end face with a wider grinding wheel area in the circumferential direction than the inner peripheral edge side. As a result, the entire grindstone portion does not generate local wear, and is almost evenly worn. As a result, the grinding accuracy of the flange end face is maintained.
[0034]
Here, if each grindstone portion extends radially with respect to the axis of the rotating body, the width of the circumferential grindstone region in each grindstone portion is in a state proportional to the diameter. As a whole part, the grinding area can be evenly applied and the wear becomes uniform. As a result, higher grinding accuracy of the flange end face is maintained.
[0035]
Further, the shaft body is formed with a flow hole through which the compressed gas flows, and when this flow hole is opened toward the inner peripheral edge of the end face of the rotating body, the chips generated by grinding are Since it is blown off by the compressed air introduced from the inner peripheral edge of the grindstone portion and removed from the outer peripheral edge to the outside, there is almost no accumulation of chips on the grindstone portion, and it is possible to prevent the quality of the flange end face to be ground from being lowered.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a grinding apparatus according to a first embodiment of the present invention.
FIG. 2 is a plan view of a grindstone disk in the grinding apparatus of the first embodiment.
FIG. 3 is an enlarged longitudinal sectional view showing a main part of the grinding apparatus according to the first embodiment.
FIG. 4 is an enlarged longitudinal sectional view showing a main part of a grinding apparatus according to a second embodiment of the present invention.
FIG. 5 is a plan view showing another example of a grindstone disk in the grinding apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grinding device 2 Shaft part 3 Tip part 4 Shaft body 5 Bearing sleeve 6 Gear 7 Grinding wheel disk 7b Grinding wheel part 8 Case 9 Compression coil spring 10 Drive motor 11 Through-hole 11a Tapered part 12 Rod 16 Main shaft 18 Pinion gear 20 Flow hole 50 Pipe Body 51 Flange 51a Flange end face

Claims (5)

In a grinding apparatus for grinding a flange end face of an end of a tubular body,
A shaft body that is inserted into the tubular body and has a distal end portion that expands and contracts in the radial direction, the distal end portion being expanded and pressed against the inner peripheral surface of the tubular body;
A rotating body having a grindstone portion that rotates while being urged by a spring body toward the flange end surface with respect to the shaft body, and is pressed against the flange end surface by the urging force of the spring body;
A grinding apparatus comprising: The tip portion is a spherical body that can be elastically deformed, and a shaft hole that is tapered in the tip portion is formed in the shaft center of the shaft body, and a rod body that advances and retreats in the through hole is provided. The grinding apparatus according to claim 1. A plurality of the grindstone portions extend from the inner peripheral edge to the outer peripheral edge on the end face of the rotating body, and each of the grindstone portions expands in the circumferential direction from the inner peripheral edge to the outer peripheral edge. The grinding apparatus according to claim 1 or 2. The grinding apparatus according to claim 3, wherein each of the grindstone portions extends radially with respect to the axis of the rotating body. The shaft body is formed with a flow hole for flowing a compressed gas, and the flow hole is opened toward an inner peripheral edge of the end face of the rotating body. The grinding apparatus as described.

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