JPH0750082Y2 - Rotary face cutting tool - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary surface which is rotatably attached to an outer peripheral portion of a rotary member which is driven to rotate about one axis and which is rotated by contact with the surface to be cut. The present invention relates to improvement of cutting tools.

[0002]

2. Description of the Related Art (a) A mounting shaft which is provided on an outer peripheral portion of a rotary member which is driven to rotate about one axis in a direction substantially orthogonal to a rotation axis of the rotary member, and (b) the mounting shaft. A bearing disposed around the bearing; and (c) an annular member rotatably disposed around the mounting shaft via the bearing and provided with a large number of cutting pins protruding radially. A plurality of rotary members are arranged on the outer peripheral portion of the rotary member, and the rotary member is rotationally driven in a state where the tip of the cutting pin is pressed against a surface to be cut perpendicular to the rotation axis of the rotary member. A rotary surface cutting tool that is rotated around the mounting shaft and cuts the work surface by the cutting pin is, for example, a road surface display paint coated on a road surface or a mortar fixed on a floor surface or a wall surface. Remove It has been used to such as grinding machine. In such a rotary type surface cutting tool, the annular member is revolved while being rotated, and a large number of cutting pins radially projected on the annular member are slidably contacted with the work surface while colliding with each other, so that high erasing is possible. Although it has the characteristics of high efficiency and good finished surface, wear and seizure are likely to occur due to repeated strong shocks to the bearings. It is normal to have

FIGS. 7 and 8 show an example of such a conventional rotary surface cutting tool. The outer peripheral portion of the rotary member 10 which is driven to rotate about the uniaxial line O has a direction substantially orthogonal to the uniaxial line O. A mounting shaft 12 is screwed onto the mounting shaft 12, and an annular member 14 having an annular shape is rotatably disposed on the mounting shaft 12 via a bearing 16. Threaded portion 18 of mounting shaft 12
Is applied with a bond and screwed into the rotating member 10, and the mounting shaft 12 is attached to the rotating member 1 via the guard ring 20.
It is permanently fixed to 0. The bearing 16 is formed by sealing a lubricant with a pair of seal members 22, and the spherical rolling elements 24 are lubricated.
Is integrally attached to the annular member 14 by means of, and is fitted to the mounting shaft 12, and is assembled to the mounting shaft 12 by a nut 30 that is screwed into the thread portion 28 of the mounting shaft 12. A felt 32 is interposed between the bearing 16 and the guard ring 20, while a flat washer 34 and a disc spring washer 36 are interposed between the bearing 16 and the nut 30. In addition, the annular member 1
On the outer peripheral portion of 4, the hardened steel cutting pins 38 are erected so as to project radially, and the rotary member 10 is rotated around the uniaxial line O with the tip of the cutting pins 38 in contact with the work surface 40. By being rotationally driven, the annular member 14 is rotated around the mounting shaft 12, and the cutting surface 38 is cut by the cutting pin 38. The material, length, etc. of the cutting pin 38 are set so that the wear period thereof and the life of the bearing 16 are approximately the same, and when they reach the end of life, the nut 30 is loosened. The bearing 16 together with the annular member 14 may be removed from the mounting shaft 12 and replaced. The life of the bearing 16 depends on the leakage of the lubricant from the seal member 22, particularly the leakage from the opposite side of the rotating member 10 due to the centrifugal force accompanying the rotation of the rotating member 10.
This is because sufficient lubrication cannot be obtained and seizure or the like occurs.

[0004]

However, in recent years, there has been a strong demand for longer tool life, and although cutting pins can be handled relatively easily by using hard materials such as cemented carbide, bearings It was not possible to meet the demand for longer tool life without appropriate measures. It has been considered to arrange a plurality of bearings side by side, but it was not always sufficiently satisfactory compared with the life of the cutting pin.

The present invention has been made in view of the above circumstances, and its purpose is to extend the life of the bearing.

[0006]

In order to achieve the above object, the present invention provides (a) an outer peripheral portion of a rotary member which is rotationally driven about one axis, and is substantially orthogonal to a rotary axis of the rotary member. Mounting shaft protruding in the direction of (1), (b) bearings arranged around the mounting shaft, and (c) rotatably arranged around the mounting shaft via the bearings and a large number of cuttings. A plurality of pins are provided on the outer peripheral portion of the rotating member, and the tip of the cutting pin is pressed against the work surface perpendicular to the rotation axis of the rotating member. In the rotary surface cutting tool, in which the annular member is rotated around the mounting shaft by rotating the rotary member in a state to cut the work surface by the cutting pin, (d) the bearing. Times Provided member side, and a seal member for preventing leakage of lubricant for lubricating the bearing,
(E) the said rotating member of the annular member provided so as to covering the mounting shaft and the bearing at the opposite end, have a cover member for holding the lubricant inside,
Moreover, the mounting shaft has a threaded portion screwed into the rotating member.
The lock nut that has the screw part
It is designed to be integrally fixed to the rotating member.
The bearing, the annular member, and the cover member together.
Can be attached to and detached from the rotating member in a physically assembled state
It is characterized by being attached .

[0007]

In such a rotary surface cutting tool, a seal member is provided on the rotary member side of the bearing to prevent leakage of the lubricant, while it is mounted on the opposite side of the rotary member. A cover member is provided on the annular member so as to cover the shaft and the bearing, and the leakage of the lubricant is reliably prevented regardless of centrifugal force or the like.
The bearing will be well lubricated for a long period of time, and the life of the bearing will be greatly improved. Therefore,
By adopting a hard material such as cemented carbide as the cutting pin, the life of the entire cutting tool can be improved in a well-balanced manner.

On the other hand, a cover member is provided so as to cover the mounting shaft and the bearing, and the lubricant is retained therein, so that when the bearing and the cutting pin reach the end of their life When removing the mounting shaft from the mounting shaft, a troublesome work such as removing the lubricant is required. However, in the present invention, the threaded portion is assembled with the bearing, the annular member, and the cover member integrally mounted on the mounting shaft. Oh
Since it can be removably attached to the rotating member via the lock nut and the lock nut, it becomes possible to replace the entire tool while holding the lubricant inside the cover member.
There is an advantage that the tool exchange work becomes easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a grinder, not shown, for removing a road surface display paint applied with an acrylic resin on a road surface and a mortar adhered to a floor surface or a wall surface. It is a top view which shows the rotor assembly 50 rotationally driven by. The rotor assembly 50 includes a rotary disk 52 as a rotary member that is driven to rotate about the one axis O, and a plurality of (three in this embodiment) rotary disks mounted on the outer peripheral portion of the rotary disk 52 at equal angular intervals. The rotary surface cutting tools 54 are arranged on a straight line orthogonal to the uniaxial line O. On the outer peripheral surface of the rotating disk 52,
A flat surface 56, which is perpendicular to a straight line orthogonal to the uniaxial line O, is provided at a portion where the rotary surface cutting tool 54 is attached.

As shown in FIG. 2 which is a II-II cross section of FIG. 1 and FIG. 3 which is viewed from the right side of FIG. 2, the rotary surface cutting tool 54 is provided with screw portions 58 and 60 at both ends. The mounting shaft 62 is provided, and the pin mounting member 66 is rotatably arranged around the shaft of the mounting shaft 62 via a bearing 64. The flat surface 56 of the rotary disk 52 is provided with a screw hole 68 in a direction orthogonal to the one axis O. The mounting shaft 62 has a screw portion 58 screwed into the screw hole 68 and is previously screwed. By rotating the lock nut 70 screwed to the portion 58 so as to come into close contact with the flat surface 56,
It is integrally fixed to the rotary disk 52. As shown in FIG. 4, the lock nut 70 is provided with four tool locking grooves 72 on the outer peripheral portion thereof.
A rotary tool is locked in the tool locking groove 72 to be rotated. The screw hole 68 and the screw portion 5
The screw of No. 8 is a left screw.

The bearing 64 is fitted to the mounting shaft 62 from the side of the threaded portion 60, and the nut 74 is screwed into the threaded portion 60, whereby the mounting shaft 62 is mounted.
It is assembled to the mounting shaft 62 by being pressed by the flange portion 76 provided on the. Flange portion 76 of bearing 64
On the side, that is, on the side of the rotating disk 52, a ring-shaped seal member 78 is arranged between the inner ring and the outer ring, and carbon or molybdenum disulfide-added grease that lubricates the spherical rolling element 80 is added. It is designed to prevent the lubricant from leaking. A felt 82 is interposed between the bearing 64 and the lock nut 70, while a plain washer 84 and a disc spring washer 86 are interposed between the bearing 64 and the nut 74. The threaded portion 6
The screws of 0 and the nut 74 are also left-handed screws.

The pin mounting member 66 is an annular body 8
8 and a cup-shaped cover portion 90 integrally provided at one end of the main body portion 88, and a large number of cemented carbide cutting pins 92a and 92b (hereinafter, not particularly distinguished) on the outer peripheral surface of the main body portion 88. In some cases, simply referred to as cutting pins 92) are provided in two rows in a radial manner. Eight cutting pins 92a and 92b are fixed by brazing or the like at 45 ° intervals, but the cutting pins 92b are positioned between the cutting pins 92a in the circumferential direction. The pin mounting member 66 is fitted to the outside of the bearing 64 in the main body 88, and is fixed to the bearing 64 by being fitted with the retaining ring 94. Further, the cover portion 90 covers the screw portion 60 of the mounting shaft 62, the nut 74, the bearing 64, and the like, and the inside of the cover portion 90 is a lubricant such as grease to which carbon or molybdenum disulfide is added. Is filled. The body portion 88 corresponds to an annular member, and the cover portion 90 corresponds to a cover member.

To assemble the rotary surface cutting tool 54 as described above, first, the bearing 64 is fitted to the mounting shaft 62, the flat washer 84 and the disc spring washer 86 are fitted, and then the nut is fitted to the screw portion 60. The bearing 64 is assembled to the mounting shaft 62 by rotating 74 to the left and screwing.
After that, with the lubricant filled in the cover portion 90 of the pin mounting member 66 on which the cutting pin 92 is erected, the pin mounting member 66 is fitted into the bearing 64, and the pin mounting member 66 is fixed by the snap ring 94. The bearing 64 cannot be separated. Then, the threaded portion 58 of the mounting shaft 62 in which the bearing 64 and the pin mounting member 66 are assembled in this manner.
The felt 82 is fitted from the side, and the lock nut 70 is screwed into the thread portion 58. Lock nut 70
Is brought into close contact with the flange portion 76, and a predetermined relative rotation resistance is given between the lock nut 70 and the mounting shaft 62, the lock nut 70 is rotated counterclockwise to operate the screw portion of the mounting shaft 62. 58 is screwed into the screw hole 68 of the rotary disk 52. After the rotation of the mounting shaft 62 is stopped by the screwing of the screw portion 58 and the screw hole 68, the lock nut 7
By rotating 0 to the left to bring it into close contact with the flat surface 56, the mounting shaft 62 is firmly fixed to the rotary disk 52, and the rotary surface cutting tool 54 is mounted on the rotary disk 52.

In this way, the three rotary surface cutting tools 5
In the rotor assembly 50 in which 4 is attached to the rotary disk 52, the uniaxial line O is perpendicular to the work surface 40 such as the road surface display paint or mortar, and the cutting pin 92 of each rotary surface cutting tool 54 is the work surface. While being pressed by 40,
It is driven to rotate around the uniaxial line O. Due to the contact friction between the cutting pin 92 and the work surface 40, the pin mounting member 66 is revolved around the uniaxial line O while rotating around the axis of the mounting shaft 62, and the cutting pin 92 with respect to the work surface 40 is rotated by this rotation. Due to the synergistic effect of striking and sliding, the work surface 40 is efficiently scraped off. At this time, the rotor assembly 50
1 is rotated clockwise in FIG. 1, the pin mounting member 66 of each rotary surface cutting tool 54 is rotated counterclockwise in FIG.
Since the screw part 58 and the screw hole 68 are left-handed screws,
Even if a counterclockwise rotational force acts on the mounting shaft 62 due to the rolling resistance of the bearing 64, the mounting shaft 62 may loosen and the rotary surface cutting tool 54 may rattle or fall off the rotary disc 52. Absent. Bearing 64 mounting shaft 6
Since the nut 74 fixed to 2 is also a left-hand thread, the nut 74 does not loosen and the bearing 64 and the pin mounting member 66 do not rattle or fall off the mounting shaft 62.

On the other hand, when the rotary pin cutting tool 54 reaches the end of its life due to wear of the cutting pin 92 or seizure of the bearing 64 due to long-term use, the lock nut 70 is rotated clockwise. And loosen it with respect to the threaded portion 58 of the mounting shaft 62, and further lock nut 70
Is rotated clockwise, the mounting shaft 62 is rotated clockwise to be disengaged from the screw hole 68. Then, a new rotary surface cutting tool 54 may be attached to the rotary disk 52. It should be noted that the lock nut 70 can be reused as needed when exchanging the tool, and of course, the removed rotary surface cutting tool 54 is disassembled and the mounting shaft 62 or the like is reused to newly install the new rotary surface cutting tool 54. It is also possible to assemble.

Here, in the rotary type surface cutting tool 54 of the present embodiment, a seal member 78 is provided on the rotary disk 52 side of the bearing 64 to prevent leakage of the lubricant, while the rotary disk 52 and The part on the opposite side is the pin mounting member 66.
Since the mounting shaft 62 and the bearing 64 are covered by the cover portion 90 which is integrally provided in the above, the leakage of the lubricant is surely prevented regardless of the centrifugal force or the like accompanying the rotation of the rotating disk 52. The bearing 64 is well lubricated for a long period of time. As a result, the service life of the bearing 64 is significantly improved, and in combination with the service life of the cutting pin 92 made of cemented carbide, the service life of the tool as a whole is improved in a well-balanced manner for a long period of time. It can be used.
Since the lubricant in the cover portion 90 is caused to flow with the rotation of the rotary disc 52 and the pin mounting member 66, it is not always necessary to fill the space in the cover portion 90 without a gap.

Further, the rotary surface cutting tool 54 of this embodiment
The bearing 64 and the pin mounting member 66 are attached to and removed from the rotary disk 52 in a state where the bearing 64 and the pin mounting member 66 are integrally assembled to the mounting shaft 62. Further, there is an advantage that the entire tool can be exchanged while the lubricant is held in the cover portion 90, and the troublesome work such as removing the lubricant is unnecessary and the tool can be exchanged easily and quickly.

Next, another embodiment of the present invention will be described. In the following embodiments, the same parts as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

The rotary surface cutting tool 100 shown in FIG.
The bearing 102 is arranged in parallel with the bearing 64, and the torsional force caused by the sliding friction between the cutting pin 92 and the work surface 40 is received at two positions separated in the axial direction of the mounting shaft 62. Therefore, there is an advantage that the load on the bearing 64 is reduced and the life thereof is further improved.
The bearing 102 is not provided with a seal member, and the lubricant in the cover 90 can freely flow to the bearing 64. Further, the length dimension of the bearing mounting portion of the mounting shaft 62 and the main body portion 88 of the pin mounting member 66 is made longer than that of the above-described embodiment due to the addition of the bearing 102.

The rotary surface cutting tool 130 of FIG. 6 has a spherical rolling element 132 instead of the pair of bearings 64 and 102 as compared with the rotary surface cutting tool 100 of FIG.
The double row bearing 134 provided in two rows is used, and the double row bearing 134 is provided with the seal member 136 only at the end on the rotating disk 52 side. This rotary surface cutting tool 130 can also obtain the same effect as the rotary surface cutting tool 100 of FIG. 5, but one double row bearing 1
Since it suffices to provide 34, there is an advantage that the assembling becomes easy and the axial dimension becomes short.

Although some embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above embodiment, the pin mounting member 6 6
Although but was adapted to be assembled to the retaining ring 9 4 Accordingly bearing 64,134, as the present applicant is described in Jitsugantaira No. 3-33374 filed earlier, the pin mounting member 6 6 Partially crimped bearings 64,1
It is also possible to assemble to 34.

In the above embodiment, the mounting shaft 62 is provided so as to project in a direction orthogonal to the rotation axis O of the rotary disk 52, but it may be slightly tilted or offset in the circumferential direction. May be.

Further, in the above embodiment, two rows of cutting pins 92 are used.
Although a and 92b are arranged alternately in the circumferential direction, it goes without saying that the number of the cutting pins 92 and the standing position can be appropriately changed.

Further, before but the pin mounting member 66 which is provided integrally with the cover portion 90 has been adopted by your施例, constitute the main body portion 88 and the cover portion 90 of the annular member separately welding For example, it may be integrally fixed.

Although not specifically exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a plan view of a rotor assembly to which a rotary type surface cutting tool according to an embodiment of the present invention is attached.

FIG. 2 is a view showing a II-II cross section in FIG.

FIG. 3 is a view of the rotary surface cutting tool of FIG. 2 as viewed from the right side.

FIG. 4 is a view alone showing a lock nut included in the rotary surface cutting tool of FIG. 2;

5 is a cross-sectional view of another embodiment of the present invention, corresponding to FIG.

FIG. 6 is a cross-sectional view of yet another embodiment of the present invention, corresponding to FIG.

FIG. 7 is a sectional view showing an example of a conventional rotary surface cutting tool.
is there.

FIG. 8 is a view of the rotary surface cutting tool of FIG . 7 as viewed from the right side.
is there.

[Explanation of symbols]

40: Work surface 52: Rotating disk (rotating member) 54 , 100 , 1 30: Rotary surface cutting tool 58: Screw part 62: Mounting shaft 64, 102: Bearing 70: Lock nut 78, 136: Seal member 88: Main body Part (annular member) 90: Cover part (cover member) 92a, 92b: Cutting pin 1 34: Double row bearing (bearing) O: Rotation axis of the rotating member

Claims (1)

[Scope of utility model registration request] 1. A mounting shaft, which is provided so as to project in a direction substantially orthogonal to a rotation axis of the rotating member, on an outer peripheral portion of the rotating member which is driven to rotate about one axis, and is arranged around the mounting shaft. A bearing, and an annular member rotatably arranged around the mounting shaft via the bearing and provided with a large number of cutting pins protruding radially, and a plurality of bearings are arranged on the outer peripheral portion of the rotating member. The rotary member is rotatably driven in a state in which the tip of the cutting pin is pressed against the surface to be cut perpendicular to the rotation axis of the rotary member, whereby the annular member is rotated around the mounting shaft. A rotary surface cutting tool for cutting the work surface with the cutting pin, comprising: a seal member provided on the rotary member side of the bearing to prevent leakage of a lubricant for lubricating the bearing; Provided to covering the mounting shaft and the bearing to the end portion of the rotary member and the opposite side of the wood, it has a cover member for holding the lubricant inside, and the mounting shaft, the rotating member Screwed into
Locker having a threaded portion and screwed into the threaded portion
Is fixed to the rotary member integrally with
The bearing, the annular member, and the cover member.
Can be attached / detached to / from the rotating member in the state where the
A rotary surface cutting tool characterized by being attached to .