JPH04128114U - Chamfering machine - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to provide a chamfering machine capable of chamfering the outer edge of a workpiece and the inner edge of a hole, etc. without interfering with the chamfering work of the inner edge. It prevents the scattering of chips generated during chamfering work on the outer edge, and furthermore, when not working,
The purpose is to minimize exposure of the cutting blade to improve safety and prevent damage to the cutting blade. [Structure] A cutting blade 23A for chamfering is fixed to the rotating shaft 7 protruding from the guide base 17 of the casing 1 with a portion peeking out from the bottom of the guide base 17, and the side surface of the workpiece 15 is A guide 27 that can come into contact with the
The guide 27 is configured to be rotatable concentrically with the rotating shaft 7 and to be retractably projected from the bottom surface of the guide base 17 in the projecting direction. A structure is adopted in which a cover 41 is provided to partially cover the surroundings.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be applied to any side surface such as the outer edge of the workpiece and the inner edge of holes, grooves, etc. The present invention relates to an improvement of a portable chamfering machine capable of chamfering even surfaces.

0002

[Conventional technology]

In Utility Application No. 63-114293, the applicant proposed a housing with a built-in motor. A guide base is provided at one end of the ring, and a rotating shaft protrudes from the guide base. Fix the chamfering cutting blade peeking out from the guide base above, and The structure consists of a guide that can contact the side surface of the workpiece at the further end of the handle. proposed a chamfering machine. This chamfering machine cuts the cutting edge on the side of the hole or curved surface of the workpiece. The guide base is placed against the flat surface of the workpiece, and the guide is The rotating cutting blade moves the chamfer while applying the chamfer to the inner peripheral surface or curved surface of the hole. It is now possible to cut holes and the ridgeline of curved surfaces and perform predetermined chamfering. .

0003

[Problem that the idea aims to solve]

However, when chamfering the inner peripheral edge of a hole in a workpiece using the above-mentioned chamfering machine, The periphery of the hole into which the cutting blade is inserted can itself prevent chips from scattering to the side. However, when chamfering the outer edge of the workpiece, it is necessary to prevent chips from scattering to the side. In addition, there is no consideration given to Since the cutting edge is exposed, there is also the problem of damaging the cutting edge. discovered by the inventor.

0004 The purpose of this invention is to chamfer the outer edges of workpieces and chamfer the inner edges of holes, grooves, etc. In a chamfering machine that can perform both types of chamfering, there are some It is possible to prevent the scattering of chips generated during chamfering work on the outer edge without The first thing to do is to minimize the exposure of the cutting blade when not working to increase safety and prevent damage to the cutting blade. It is an object of the present invention to provide a chamfering machine that can prevent such problems.

[0005]

[Means to solve the problem]

The chamfering machine according to the present invention has a guide base attached to one end of the casing. The rotating shaft protruding from the base is chamfered so that a part of it is visible from the bottom of the guide base. In addition to fixing the cutting blade, a guide that can come into contact with the side surface of the workpiece is attached at the end of the cutting blade. further provided, the guide is concentric with the rotating shaft and is rotatable around the same axis; Adopts a structure with a cover that protrudes from the bottom of the base so that it can be retracted and retracted using a spring. It is something to do.

[0006]

[Effect]

When no external force is applied to the cover, the cover is on the bottom side of the guide base. This prevents the cutting edge from being completely exposed and prevents damage to the cutting edge during non-chamfering operations. Prevents scratches and improves safety. While the cover is in the protruding state, the outside of the workpiece is Place the guide base flat on the workpiece with the guide and cover facing the edge. The guide is applied to the surface, drives the rotating shaft, and cuts the ridgeline of the workpiece with the cutting blade. Chamfering is performed by moving the chamfering machine along the side of the workpiece. At this time, the cover remains in contact with the outer edge of the workpiece and covers the cutting blade. This prevents chips from scattering to the side. Inserting the cover itself When chamfering a hole or circumferential surface with a curvature so small that it cannot be chamfered, use the cutting blade to Insert the cover into the workpiece and push it against the flat surface of the workpiece while resisting the elastic force of the spring. In this state, rotate the guide with the guide facing the circumferential surface of the workpiece. While driving the shaft and cutting the ridgeline of the workpiece with the cutting blade, move the guide along the side of the workpiece. Chamfering is performed by moving the chamfering machine along the section.

[0007]

【Example】

The chamfering machine of this embodiment has a case bent into a roughly L shape, for example, as shown in Fig. 1. The air motor is built into the ring 1, and the drive shaft to which the rotational force of this air motor is transmitted. 3 is pivotally supported by the casing 1 via a ball bearing 5, and the lower end of the casing 1 A rotary shaft 7 is fitted and fixed to the drive shaft 3 facing toward. At the lower end of casing 1 , an annular connector 9 is fixed with its axis aligned with the rotating shaft 7, and this annular connector A female thread 11 and a male thread 13 are individually formed on the inner and outer peripheral surfaces of the tab 9. There is.

[0008] The female thread 11 of the annular connector 9 has a guide placed on the surface of the workpiece 15. A male thread 21 formed on the outer peripheral surface of the annular boss portion 19 of the base 17 is screwed into the ring. A guide base 17 is detachably fixed to a shaped connector 9. The rotating shaft 7 is as above. It passes through the center of the annular boss portion 19 and protrudes toward the bottom side of the guide base 17. For this purpose, a square cutting tip 23 having cutting edges 23A on four sides is used. One side faces the bottom surface of the guide base 17 at an angle of 45°, for example. A part of the guide base 17 is peeked out from the bottom side, and is removably fixed with screws 25. to be determined. At the tip of the rotating shaft 7, there is a guide that can rotate in contact with the side surface of the workpiece 15. Fix the idle bearing 27 with a cap nut 29.

[0009] Incidentally, the amount of chamfering C by the cutting blade 23A of the cutting tip 23 is shown in FIG. When the cutting tip 23 is facing the front, the cutting blade 23A is facing the guide base. 17 and the outer peripheral surface of the guide bearing 27. The size will be according to your needs. Therefore, the annular boss portion 19 that is screwed into the annular connector 9 is rotated together with the guide base 17, and the guide base 17 is aligned with the axis of the rotating shaft 7. In other words, by moving the cutting blade 23 in the direction below the guide base 17. The amount of chamfering can be adjusted by adjusting the amount that the surface is exposed to. At this time , the amount of movement of the guide base 17 is determined by the thread pitch of the female thread 11 of the annular connector 9 and the guide It is uniquely determined by the rotation speed of the base 17. Connect the annular boss portion 19 to the annular connector. When removed from the cutter 9, the cutting tip 23 is completely exposed to the outside.

0010 The male thread 13 of the annular connector 9 has a female thread formed on the inner peripheral surface of the lock ring 31. A screw 33 is formed to be screwable. The above annular connector 9 and this lock ring 31, the annular boss portion 19 of the guide base 17 can be separated from the inner peripheral surface of the annular connector 9; It is configured as follows to fix the function. That is, the annular connector 9 For example, three grooves 35 parallel to the axis of the ring are formed at equal intervals. The lock ring 31 is screwed onto the outer peripheral surface of the connector 9. Also, the annular coil A downwardly inclined surface 37 is gently formed on the outer peripheral portion of the lower end of the connector 9. On the other hand, the lock The inner circumferential surface on the lower end side of the cling ring 31 also has an upward slope having the same inclination angle as the above-mentioned slope surface 37. A surface 39 is formed, and the ring 31 is rotated to move up and down in the axial direction of the rotating shaft 7. When the annular connector 9 is engaged with the downwardly inclined surface 37 of the annular connector 9, the annular connector 9 is It is configured so that it can be pressed in the centripetal direction. Above lock ring 31 The upwardly inclined surface 39 presses the downwardly inclined surface 37 in the centripetal direction so that the annular connector 9 By elastically deforming in a direction to slightly reduce the diameter, the annular boss portion 19 and the annular co The screw-fitting state with the connector 9 is firmly fixed.

[0011] A cover 41 is placed in the gap between the rotating shaft 7 and the annular boss portion 19 in the same manner as the rotating shaft 7. It is arranged to be able to move and rotate in the axial direction around the center. This cover 41 has an annular flap at the upper end. It has a flange portion 43 and extends from the flange portion 43 toward the lower end, for example. A split cylinder body 45 having an arcuate cross section is provided, and the flange portion 43 is pushed downward by a spring 47. The guide base 17 can be projected and retracted from the bottom of the guide base 17 at will. The protrusion of the cover 41 In the extended state, its lower end is located below the cap nut 29, and the split cylinder body 45 is in contact with the cutting blade. Cover 23A. On the other hand, a spring is attached to the split cylinder body 45 protruding from the bottom side of the guide base 17. When the axial pressing force that resists the elastic force of 47 is used as an effect, the split cylinder body 45 is connected to the rotating shaft 7. The guide base 17 moves toward the space formed between the annular boss portion 19 and the guide base 17. to completely expose the cutting blade 23A.

0012 Now, to explain the structure of the cover 41 in more detail, its overall shape is shown in FIG. As shown in FIG. 5, the split cylinder 45 has a cross-sectional shape as shown in FIG. The imaginary line L, which is larger than a semicircle and connects the left and right split ends 45A, is the guide bear. A predetermined distance S is set between the side surfaces 15A and 15B of the workpiece 15 that the ring 27 comes into contact with. It has a shape that makes it easy to look at. Therefore, in order to chamfer the side surface 15A of the workpiece, For this purpose, the guide bearing 27 is placed in contact with the side surfaces 15A and 15B. The split cylinder body 45 has the split end portion 45A close to or in contact with the side surfaces 15A and 15B. This covers the guide bearing 27 and the cutting blade 23A.

[0013] Next, the operation of the above embodiment will be explained.

[0014] First, when adjusting the amount of chamfering, turn the lock ring 31 in the loosening direction. The upwardly inclined surface 39 is separated from the downwardly inclined surface 37 of the annular connector 9, and the annular connector The fastened state between the connector 9 and the annular boss portion 19 is released. So to the ring connector 9 Rotate the annular boss portion 19 that is fitted together with the guide base 17 to remove the guide base. The amount of protrusion of the cutting blade 23A, which is partially peeked out from the bottom surface of the base 17, is adjusted to the required amount of chamfering C. Change to get. After that, turn the lock ring 31 in the tightening direction, and The upwardly inclined surface 39 of the ring 31 presses the downwardly inclined surface 37 of the connector in the centripetal direction. , the annular connector 9 is slightly elastically deformed in the centripetal direction, and the annular boss portion 19 and the annular To strengthen the screw-fitting state with the connector 9.

[0015] After setting the amount of chamfering in this way, for example, the outer peripheral edge of the workpiece 15 When chamfering the ridgeline of a curved surface, start the air motor and rotate the rotating shaft 7. 2, the guide bearing 27 is attached to the side surface 15 of the workpiece 15. The bottom surface of the guide base 17 is placed on the surface of the workpiece 15 so as to be in contact with the point A. At this time, the cover 41 faces the side surface 15A of the workpiece 15 as shown in the figure. , covering the peripheral portion of the cutting blade 23A. In this state, guide bearing 7 by moving the guide bear along the side surface 15A of the workpiece 15. The cutting blade 23A fixed to the rotating shaft 7 together with the ring 27 cuts the ridgeline portion of the workpiece 15. Cut and chamfer as required. Chips generated during chamfering work are blocked by the split cylinder 45. This prevents it from scattering to the sides. Since the cover 41 is rotatable, the surface to be chamfered Even if it is a curved surface, the split end 45A contacts the curved surface and automatically rotates to change the direction. changes and covers the cutting blade 23A while rotating to follow the shape of the surface to be chamfered. . In addition, if the surface to be chamfered is the inner peripheral surface of a circular arc, the curved surface of the circular arc that can be chamfered is The ratio will be limited by the gap size S shown in FIG.

[0016] In addition, when chamfering the inner circumferential edge 15B of the hole in the workpiece 15, an air motor to rotate the rotating shaft 7, and in this state it protrudes from the bottom side of the guide base 17. The bottom surface of the guide base 17 is pressed so that the tip of the rotating shaft 7 is inserted into the hole. It is placed on the surface of the workpiece 15. At this time, the cover 41 resists the elastic force of the spring 47. The split cylinder body 4 is compressed and stored in the gap between the rotating shaft 7 and the annular boss portion 19. The lower end of the guide base 17 is inserted into the guide base 17. In this state, the gas is attached to the inner side surface 15B of the hole. When the chamfering machine is moved while pressing the outer periphery of the bearing 27, the The guide bearing 27 is guided so as to follow the shape of the inner peripheral surface of the hole 15A. By doing so, the cutting blade 23 fixed to the rotating shaft 7 together with the guide bearing 27 A chamfers the ridgeline of the hole 15A, and at this time, the split cylinder 45 of the cover 41 is completely removed. Does not interfere with work. Note that the curvature of the inner peripheral edge of the hole is limited by the dimension S in Figure 5. If this is not possible, insert a split tube tie 5 into the hole and chamfer it. In this case, the split cylinder 5 prevents chips from scattering as well as when chamfering a straight side surface. To prevent.

[0017] When the chamfering machine is left alone, the cover 41 is moved by the elastic force of the spring 47. The cutting blade 23A is protruded from the bottom side of the base 17 and is completely exposed. to prevent Therefore, the cover 41 can be easily removed by the operator when the work is being carried out. Reduces the risk of injury from touching the cutting blade 23A, and prevents damage to the cutting blade 23A. do.

[0018] The invention made by the present inventor has been specifically explained above based on examples, The present invention is not limited thereto, and may be applied to any other invention without departing from the gist thereof. Needless to say, it can be changed. For example, the drive source is limited to an air motor. Instead, it may be a hydraulic motor or an electric motor. In addition, the above guide bearing can also be changed to a non-rotating ring or arc-shaped guide, and the rotation axis itself The guide may be formed directly on the body. Also, the shape of the cover is not limited to the split tube shape. An appropriate shape such as a rectangular shape can be adopted.

[0019]

[Effect of the idea]

The chamfering machine according to the present invention has a cover that is placed on the bottom side of the guide base when not working. It protrudes elastically from the blade and prevents the cutting blade from being completely exposed, making it easy to cut when not working. It is possible to prevent damage to the cutting blade and improve safety.

[0020] Also, when chamfering the outer edge of the workpiece, be sure to protrude from the lower side of the guide base. The cover to be removed should remain in contact with the outer edge of the workpiece and cover the cutting blade. This has the effect of preventing chips from scattering to the side. Koto The cover can be rotated concentrically around the rotating shaft to which the guide and cutting blade are attached. Even if the side surface of the workpiece has a curved shape, the cover will follow that shape. Follow-up rotation and maintain the chip scattering prevention effect even when chamfering the curved side surface. It is possible to cope with this situation.

[0021] Furthermore, since the cover can be retracted from the bottom of the guide base, Press the cover against the flat part of the workpiece and move the cover against the elastic force to the guide base. If retracted, the hole has such a small curvature that the cover itself cannot be inserted. You can perform chamfering work on the surface of the machine and the surrounding surface without the cover getting in the way. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway longitudinal sectional front view showing an embodiment of a chamfering machine according to the present invention.

FIG. 2 is a partially longitudinal sectional front view of the chamfering machine in a working state for chamfering the outer edge of a workpiece.

FIG. 3 is a longitudinal sectional front view of the chamfering machine in a working state of chamfering the inner circumferential surface of a hole in a workpiece.

FIG. 4 is a perspective view of the cover.

FIG. 5 is a partial bottom view of the chamfering machine for explaining the relationship between the split cylinder of the cover and the side surface of the workpiece.

[Explanation of symbols]

1 Casing 7 Rotation axis 15 Work material 15A, 15B side part 17 Guide base 23A cutting blade 41 Cover 45 Split tube body 45A Split end

──────────────────────────────────────────────── ─── Continuation of front page (72) Inventor: Menghiko Miyazaki Nitto, 2-9-4 Nakaikegami, Ota-ku, Tokyo Inside Kouki Co., Ltd.

Claims (1)

[Scope of utility model registration request] Claim 1: A cutting blade for chamfering is fixed to a rotary shaft protruding from a guide base attached to one end of a casing, with a part thereof peeking out from the bottom of the guide base, and a cutting blade for chamfering is fixed to a rotating shaft protruding from a guide base attached to one end of a casing, and a cutting blade for chamfering is fixed to a rotating shaft protruding from a guide base attached to one end of a casing, and a cutting blade for chamfering is fixed to a rotating shaft protruding from a guide base attached to one end of a casing. a chamfer that is provided with a guide that can come into contact with the side surface of the guide base, and that is further provided with a cover that is concentric with the rotating shaft and is rotatable around the same axis, and that protrudes retractably from the bottom surface of the guide base by a spring. Machine.