KR20160133177A - Grinding tool diameter rotary joint processing - Google Patents

Abstract

The present invention relates to a grinding tool for a rotary joint internal diameter grinding tool, which is mounted on a rotary tool and is capable of precisely machining an inner diameter of the rotary joint 300 while rotating at a high speed, The grinding tool includes: a spindle (100) which is detachably attached to the rotary tool; And a grinding wheel 200 screwed to the center of the front end face of the spindle 100 in a direction opposite to the direction in which the spindle 100 rotates. The circumferential surface of the grinding wheel 240 constituting the grinding wheel 200 A plurality of circular arc shaped slag discharge grooves 242 are formed at predetermined intervals in the circumferential direction of the abrasive wheel 240 and at the center of the width of the abrasive wheel 240, And a strip-shaped slag discharge guide groove (244) is further formed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary joint,

More specifically, the present invention relates to a grinding tool for an inner diameter machining of a rotary joint, and more particularly, to a grinding tool for an inner diameter grinding tool capable of precise inner diameter machining without any separate dressing operation, smoothly discharging slag generated during grinding, To a grinding tool for an inner diameter machining.

Generally, a workbench, such as a ladder or a fire truck, which can be elevated, is provided with a rotary joint of a structure capable of rotating mechanically unlimitedly.

Such rotary joints require precise inner diameter machining because the inner joint surface of the rotary joint is inferior in surface roughness or precision, which causes sealing problems such as o-rings.

On the other hand, grinding means machining in which the surface of a workpiece is cut or polished, or machined to have a uniform and precise surface roughness by using carbide or tool steel.

This grinding process is for machining an inner or outer surface of a workpiece, an outer ring, an inner ring, and the like, and includes a wheel or plate-like grinding wheel and a shank for engaging with the tool to be rotated. No. 0155221 (Jul. 14, 1998), Published Patent No. 2013-0038453 (Apr. 17, 2013), Registration No. 0458850 (Feb.

However, these prior art techniques are mainly related to surface polishing, and are far from the inner diameter polishing of workpieces, especially objects such as rotary joints.

In connection with the inner diameter grinding of a rotary joint, a grinding tool as disclosed in Patent Publication No. 0549735 (2006.02.08) has been used in the past, but this has a disadvantage that the grinding wheel must be dressed each time.

The dressing of the grinding stone is intended to increase the grinding quality by newly grinding the surface of the grinding wheel because the roughness of the grinding surface is sharply lowered, the grinding quality is lowered, and the grinding can not be performed when the grinding stone is partially broken, pierced or clogged.

Therefore, there is a disadvantage in that the productivity is deteriorated due to the inconvenience of dressing each time, deterioration of workability due to the dressing, and overworking time.

In addition, in the case of conventional grinding tools, it is difficult to process the grinding wheel due to the slight fluctuation due to the characteristic of the inner diameter machining which is processed at about 60000 rpm. Even if the grinding tool is machined within the required tolerance, such shaking makes it difficult to achieve high quality. Have.

In addition, since the slag generated during grinding is not discharged, the necessity of dressing due to clogging, as well as the fact that the slag is adhered to the surface of the workpiece to further lower the surface roughness, Often occurs.

DISCLOSURE Technical Problem The present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to provide a polishing apparatus and a method of polishing the same, The present invention provides a grinding tool for an inner diameter machining of a rotary joint, which can increase the surface roughness, improve the surface roughness, enable precise machining, and prevent shaking, thereby enabling the endpoint machining.

The present invention provides a grinding tool mounted on a rotary tool for precisely machining an inner diameter of a rotary joint 300 while rotating at a high speed, the grinding tool comprising: The grinding tool includes: a spindle (100) which is detachably attached to the rotary tool; And a grinding wheel 200 screwed to the center of the front end face of the spindle 100 in a direction opposite to the direction in which the spindle 100 rotates. The circumferential surface of the grinding wheel 240 constituting the grinding wheel 200 A plurality of circular arc shaped slag discharge grooves 242 are formed at predetermined intervals in the circumferential direction of the abrasive wheel 240 and at the center of the width of the abrasive wheel 240, And a strip-shaped slag discharge guide groove (244) is further formed.

The spindle 100 includes a threaded fastening part 110 fastened to the rotary tool, a tapered part 120 extending from the threaded fastening part 110 so as to increase in diameter, And a fixed body portion 130 extending at a predetermined diameter at an end of the fixed body portion 130.

Further, a wheel fixing groove 134 formed of a guide groove portion 134a and a wheel coupling portion 134b having stepped portions is formed on a distal end face of the fixed body portion 130; The grinding wheel 200 includes a wheel plate 210 having a disk shape and a boss 220 integrally projecting from a center of one side of the wheel plate 210 and having a diameter corresponding to the guide groove 134a, A wheel fixing part 230 extending from the boss 220 by a predetermined length and screwed to the wheel coupling part 134b in a direction opposite to the rotation of the spindle 100; And a polishing grindstone 240 that is integrally formed with the polishing cloth 240.

According to the present invention, it is possible to achieve precise inner diameter machining without any separate dressing operation, smooth slag discharge generated during grinding, smooth clogging, and little tremble.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an illustration of an example of a grinding tool for an internal diameter machining of a rotary joint according to the present invention. Fig.
2 is an exemplary partially exploded view of a grinding tool for a rotary joint internal bore according to the present invention.
FIGS. 3 and 4 are illustrations showing examples of use of a rotary joint internal grinding tool for grinding tool according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

As shown in FIGS. 1 to 4, the rotary joint bore grinding tool according to the present invention includes a spindle 100.

The spindle 100 is assembled to a rotating tool and has a screw coupling part 110 at an end thereof to facilitate assembly fastening.

Therefore, it is possible to assemble and disassemble in a short time, and workability can be improved.

The spindle 100 includes a tapered portion 120 extending gradually from the threaded fastening portion 110. A fixed body portion 130 having the same diameter is formed at an end portion of the tapered portion 120, Are integrally formed.

The tapered portion 120 is extended to have a predetermined length, preferably equal to or smaller than the fixed body portion 130. The tapered portion 120 is formed to have a larger radius toward the grinding wheel 200 So that the force acts on the grinding wheel 200 when rotating so as to increase the contact force of the grinding wheel 200 with the workpiece.

In other words, it is intended to increase the workability and enhance the surface quality of the machined surface by allowing the operator to naturally pressurize without artificially depressing.

A tool engagement groove 132 is formed in a part of the outer circumferential surface of the fixed body part 130 in a substantially '-shaped manner. The tool engagement groove 132 is formed by mounting the spindle 100 on a rotary tool Or to make it easier to tighten or loosen the work tool by preventing the work tool from slipping.

A wheel fixing groove 134 is formed at the center of the front end face of the fixed body part 130.

At this time, the wheel fixing groove 134 is formed with a step, and the diameter from the inlet to a certain depth has a step larger than the diameter thereafter.

Thus, the guide groove portion 134a is formed from the inlet to the stepped portion, and the wheel fastening portion 134b having the inner diameter formed from the point beyond the stepped portion is formed.

The reason why the guide groove portion 134a and the wheel coupling portion 134b are stepped on each other is to cover the step between the wheel fixing portion 230 of the polishing wheel 200 and the boss 220, 200).

The grinding wheel 200 includes a wheel plate 210 in the form of a disk, a boss 220 integrally protruding from the center of one side of the wheel plate 210, and a boss 220 integrally extended from the boss 220, And a grinding wheel 240 integrally coated with a predetermined thickness on the circumferential surface of the wheel plate 210.

At this time, the boss 220 is a solid body filled with the inside, and a screw thread is formed on the outer circumferential surface of the wheel holding unit 230. The thread must be formed in a direction opposite to the direction in which the spindle 100 rotates.

Since the spindle 100 rotates at a high speed of 60000 rpm, if the spindle 100 is erroneously erected, the wheel lifting unit 230 can be loosened. In this case, a large accident occurs. Automatically lock and tighten to prevent predictable accidents in advance.

Also, the wheel holding portion 230 is processed with a step with the boss 220, so as to minimize the flow by providing a locking stability.

That is, the boss 220 has a diameter corresponding to the guide groove portion 134a, and the wheel holding portion 230 is configured to be coupled with the wheel fastening portion 134b.

Particularly, since the depth of the wheel fastening portion 134b is longer than the length of the wheel lifting portion 230, a clearance is formed inside the wheel lifting portion 230 after fastening the wheel lifting portion 230, So that the occurrence of machining errors is completely prevented by suppressing the thermal deformation as much as possible.

2, the grinding wheel 240 is formed with a plurality of slag discharge grooves 242 that are arc-shaped and spaced at predetermined intervals along the circumferential surface.

The slag discharge groove 242 is formed so as to extend over the entire width of the grinding wheel 240. A ring-shaped slag discharge guide groove 244 is formed at the center of the width of the grinding wheel 240 along the circumferential direction .

In this case, the slag discharge guide groove 244 naturally communicates with the slag discharge groove 242.

Furthermore, the slag discharge guide groove 244 is formed by recessing in a semicircular shape.

Therefore, although slag generated during high-speed polishing does not have a discharge structure in the prior art, there have been situations that have been pointed out as a conventional problem. However, in the present invention, even if a small amount of slag is rotated at high speed, And flows out through the slag discharge groove 242 in the direction orthogonal to the grinding wheel 200 through the slag discharge groove 242, so that the problem caused by the slag is substantially eliminated.

As a result, since the slag discharge is smooth during the inner diameter machining of the rotary joint 300 to completely eliminate the clogging phenomenon of the polishing stone 240, there is no need to perform a separate process for dressing the polishing stone 240, The efficiency is improved and the working time is shortened.

In addition, the surface roughness of the inner surface of the rotary joint 300 can be changed by the slag fixing. In the present invention, since the slag fixing does not occur, more accurate and uniform surface roughness can be maintained.

Particularly, even if the operator does not artificially press the spindle 100, the same force is automatically applied to the machined surface by the action of the tapered portion 120, so that the uniformity of the machined surface is further increased.

In addition, since the tapered portion 120 concentrates on the front end where the force is increased during rotation, the shaking or swinging of the spindle 100 is minimized to further improve the polishing defect, that is, the accuracy.

As described above, the present invention has a slag discharging structure and a structural design capable of minimizing the shaking of the spindle 100, thereby achieving the effects of improving the precision in the inner diameter machining, improving the surface roughness, and eliminating the need for additional dressing And the sealability of the rotary joint 300 is suppressed, thereby improving the sealing performance.

100: spindle 200: grinding wheel
300: Rotary joint

Claims (3)

A grinding tool mounted on a rotary tool for precisely machining an inner diameter of a rotary joint (300) while rotating at a high speed, the grinding tool comprising:
The grinding tool includes: a spindle (100) which is detachably attached to the rotary tool; And a grinding wheel (200) screwed to the center of the front end face of the spindle (100) in a direction opposite to the rotation of the spindle (100)
A plurality of arc-shaped slag discharge grooves 242 are formed at predetermined intervals on the circumferential surface of the grinding wheel 240 constituting the grinding wheel 200. At the center of the width of the grinding wheel 240, And a circular strip-shaped slag discharge guide groove (244) is formed along the circumference of the polishing stone (240) so as to communicate with the groove (242).
The method of claim 1,
The spindle 100 includes a threaded fastening part 110 fastened to the rotary tool, a tapered part 120 extending from the threaded fastening part 110 so as to increase in diameter, And a fixed body part (130) extending in a predetermined diameter from the fixed body part (130).
The method of claim 2,
A wheel fixing groove 134 formed of a guide groove portion 134a and a wheel coupling portion 134b having stepped portions is formed on the distal end face of the fixed body portion 130; The grinding wheel 200 includes a wheel plate 210 having a disk shape and a boss 220 integrally projecting from a center of one side of the wheel plate 210 and having a diameter corresponding to the guide groove 134a, A wheel fixing part 230 extending from the boss 220 by a predetermined length and screwed to the wheel coupling part 134b in a direction opposite to the rotation of the spindle 100; And a polishing grindstone (240) integrally formed with the polishing pad (240).

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