JP2008290242A - Bolt end processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt end processing device and a bolt end processing method capable of cutting or grinding the end part of a bolt while preventing chips from being spattered. <P>SOLUTION: This portable bolt end processing device 10 for processing the end part of an installed bolt to a smooth surface comprises: an external sleeve 12 having an end part fittable onto a nut 2 tightened to the bolt 1 generally without a gap; a first cutter 13A rotatably fitted into the external sleeve 12 at a specified gap and cutting the end part 1a of the bolt 1; a second cutter 13B secured onto the first cutter 13A and chamfering the end outer peripheral surface 1a of the bolt 1; and a drive means 14 for rotating both cutters 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bolt end processing apparatus that can be suitably used for end processing of a torcia-type bolt.

  Steel frames in steel structures such as bridges and high-rise buildings are joined by inserting bolts into bolt holes formed in the steel frames and fastening nuts to the bolt ends. As a bolt for connecting steel frames, a breaking groove was formed in the vicinity of the tip of the bolt, and the nut could be tightened while holding the pin tail on the tip side of the breaking groove, and the tightening torque exceeded the set torque Sometimes, the so-called Torcia-type bolt configured so that the breaking groove breaks and the pin tail falls off can receive the tightening reaction force with the pin tail, prevent the bolt from rotating together, and ensure the desired tightening torque, It has been widely adopted because it has advantages such as (see, for example, Patent Document 1).

JP-A-8-105422

  By the way, in the torcia-type bolt, since the pin tail is broken along the breaking groove, the front end portion of the bolt after the pin tail breaks has a rough fracture surface, and there is a possibility of injury if a finger touches it. In addition, since the front end portion of the bolt becomes a ground surface not subjected to rust prevention treatment, there is a problem that rainwater or the like adheres and is easily corroded. In order to prevent corrosion, it is also practiced to apply anti-rust paint to the bolt ends after breaking the pin tail. However, since the bolt tip is rough, There is a problem in that coating failure such as deterioration of the coating film or peeling of the coating film easily occurs, and a sufficient antirust effect cannot be ensured.

  On the other hand, it is possible to apply the anti-corrosion paint after grinding the tip of the bolt smoothly to the surface with a grinder. However, with a commercially available simple grinder, the chips are scattered and the working environment Deteriorated or the scattered chips rusted, reducing the durability of the steel frame, or the chips may adhere to the vehicle parked near the construction site and damage the vehicle coating film. There were many problems. Moreover, grinding with a grinder requires a processing time of about 30 to 60 seconds per bolt, and even a relatively small bridge uses thousands of bolts. There is also a problem that it takes a lot of time.

  An object of the present invention is to provide a bolt end processing apparatus and a bolt end processing method capable of cutting or grinding a bolt end while preventing scattering of chips.

  The bolt end processing device according to the present invention is a portable bolt end processing device that processes a bolt end portion that has been constructed into a smooth surface, and the tip end portion is substantially spaced from the nut fastened to the bolt. An external sleeve that can be externally fitted, a first cutter that is mounted in the outer sleeve so as to be relatively rotatable with a certain gap therebetween, and that cuts the tip of the bolt, and a driving means that rotates the first cutter. It is provided.

  In the bolt end processing apparatus, the tip of the bolt is cut with the first cutting tool in the outer sleeve while the front end of the outer sleeve is fitted to the nut without any gap, so that the chips are scattered outside. Can be reliably prevented. In addition, the outer sleeve fitted on the nut allows the center of rotation of the first cutter to be positioned coaxially with the axis of the bolt, so that the positional relationship between the first cutter and the bolt is stabilized, and the tip of the bolt is smooth. Can be cut. Furthermore, since the tip of the bolt is processed into a smooth surface by cutting, the processing time of the bolt end can be greatly shortened as compared with the case of processing by grinding. The chips generated by cutting can be configured to be sequentially discharged into the storage box by detachably installing the storage box on the outer sleeve, or connected to the outer sleeve as described later. It can be sucked with a suction machine.

  Here, in the bolt end processing apparatus, the second cutter that chamfers the outer peripheral portion of the tip of the bolt is fitted and fixed to the first cutter, and the first cutter and the second cutter are provided with a certain gap in the exterior sleeve. Can also be mounted in a relatively rotatable manner. Even when the tip of the bolt is processed into a smooth surface, if a corner is formed on the outer periphery of the tip, the film thickness of the anticorrosive paint on the corner is reduced. It is preferable to chamfer. In the present invention, the second cutting tool for chamfering the outer periphery of the bolt is fitted and fixed to the first tool so that the cutting of the bolt and the cutting of the outer periphery of the bolt can be performed simultaneously. The end of the bolt can be processed into a smooth surface without corners while preventing deterioration of the properties.

  A holder member that is externally fitted and fixed to the first blade is provided, a second blade is provided at the tip of the holder member, and a discharge hole that discharges chips that have entered between the first blade and the holder member to the outside is provided in the holder member. Forming is also a preferred embodiment. By comprising in this way, it becomes possible to discharge | emit the chip | tip which penetrate | invaded between the 1st blade and the holder member to the exterior through a discharge hole, and can prevent clogging of a chip | tip. Using the centrifugal force during the rotation of the blade, the chips that have entered between the first blade and the holder member can be smoothly discharged to the outside. Moreover, since the air in the gap between the first blade and the holder member can be discharged to the outside using centrifugal force and the air in the outer sleeve can be circulated, both the blades can be efficiently cooled and cut during cutting. It is possible to prevent the blade from being thermally deteriorated due to heat generation.

  It is also a preferred embodiment to provide a suction machine for sucking chips in the outer sleeve. In this case, chips generated when cutting the bolt ends can be sucked with a suction machine, so that the chips can be reliably prevented from scattering and the chips can be discharged efficiently. Become. Further, since the blade can be cooled by the outside air flowing into the outer sleeve from the gap between the nut and the outer sleeve, it is possible to prevent the blade from being thermally deteriorated due to a temperature rise due to heat generated during cutting.

  It is also a preferred embodiment that the base end portion of the outer sleeve is externally fitted and fixed to the chuck of the driving means so as to be relatively rotatable. The outer sleeve is preferably configured to be fixed to the casing of the driving means and receive the cutting reaction force with a nut. However, when the outer sleeve is externally fitted and fixed to the chuck of the driving means as in the present invention, This is preferable because the sleeve can be made compact.

  Either one of the first blade and the second blade can be formed of a grindstone, and either one of the front end portion of the bolt and the outer peripheral portion of the front end of the bolt can be ground. Cutting the tip of the bolt into a smooth surface by cutting with a blade is preferable in order to shorten the processing time and increase the working efficiency, but it is also possible to grind with a grindstone.

  In a preferred embodiment, the bolt is a Torcia bolt. In the Torcia-type bolt, the pin tail is broken at the time of bolt fastening, so that a rough fracture surface is formed at the tip of the bolt after fastening, and rust is easily generated on the fracture surface. In the bolt end processing apparatus according to the present invention, such a broken surface can be processed into a smooth surface so that the rust preventive paint can be satisfactorily mounted.

  The bolt end processing method according to the present invention is a bolt end processing method for processing a constructed bolt end into a smooth surface, and the front end of the outer sleeve is removed from the nut fastened to the bolt without a substantial gap. The outer sleeve is axially positioned coaxially with the axis of the bolt, and the first blade inside the outer sleeve is rotated while suctioning and collecting dust in the outer sleeve, The tip of the bolt is cut with the first blade.

  In the bolt end processing method, the front end of the outer sleeve is externally fitted to the nut without any gap, and the tip of the bolt is moved by the first cutter in the outer sleeve while sucking and collecting dust in the outer sleeve. Since the portion is cut, it is possible to surely prevent the chips from scattering to the outside, and it is possible to efficiently collect the chips. Further, since the blade can be cooled by the outside air flowing into the outer sleeve from the gap between the nut and the outer sleeve, it is possible to prevent the blade from being thermally deteriorated due to a temperature rise due to heat generated during cutting. In addition, the outer sleeve fitted on the nut allows the rotation center of the first cutter to be positioned coaxially with the axis of the bolt, thereby stabilizing the positional relationship between the first cutter and the bolt and smoothing the tip of the bolt. Can be cut. Furthermore, since the tip of the bolt is processed into a smooth surface by cutting, the processing time of the tip of the bolt can be greatly reduced as compared with the case of processing by grinding.

  Here, it is preferable to externally fix and fix the second cutter chamfering the tip outer periphery of the bolt to the first cutter, and simultaneously cutting the bolt tip and the tip outer periphery with the first cutter and the second cutter. It is a form. In this case, the cutting of the front end of the bolt and the cutting of the outer periphery of the front end of the bolt can be performed at the same time, so that the front end of the bolt can be processed into a smoother surface without reducing workability. .

  A holder member that is externally fitted and fixed to the first cutter is provided, a second cutter is provided at the tip of the holder member, and chips that have entered between the first cutter and the holder member are discharged from a discharge hole formed in the holder member. However, the bolt end can also be cut. In this case, the chips entering between the first blade and the holder member can be discharged to the outside through the discharge holes, and clogging of the chips can be prevented. Moreover, the chips that have entered between the first blade and the holder member can be smoothly discharged to the outside by utilizing the centrifugal force during the rotation of the blade. Moreover, since the air in the gap between the first blade and the holder member can be discharged to the outside using centrifugal force and the air in the outer sleeve can be circulated, both the blades can be efficiently cooled and cut during cutting. It is possible to prevent the blade from being thermally deteriorated due to heat generation.

  Either one of the first blade and the second blade can be formed of a grindstone, and either one of the front end portion of the bolt and the outer peripheral portion of the front end of the bolt can be ground. It is preferable to process the tip of the bolt into a smooth surface by cutting with a blade in order to shorten the processing time and increase the working efficiency, but it is also possible to process with a grindstone.

  In a preferred embodiment, the bolt is a Torcia bolt. In the Torcia-type bolt, the pin tail is broken at the time of bolt fastening, so that a rough fracture surface is formed at the end of the bolt after fastening, and rust is easily generated on the fracture surface. In the bolt end processing apparatus according to the present invention, such a broken surface can be processed into a smooth surface so that the rust preventive paint can be satisfactorily mounted.

  According to the bolt end processing device and the bolt end processing method according to the present invention, the front end of the bolt is moved by the first cutter in the outer sleeve in a state where the front end of the outer sleeve is fitted to the nut without any gap. Since cutting is performed, it is possible to prevent the chips from scattering to the outside. In addition, the outer sleeve fitted on the nut allows the center of rotation of the first cutter to be positioned coaxially with the axis of the bolt, so that the positional relationship between the first cutter and the bolt is stabilized, and the tip of the bolt is smooth. Can be cut. Furthermore, since the tip of the bolt is processed into a smooth surface by cutting, the processing time of the bolt end surface can be greatly shortened as compared with the case of processing by grinding. Moreover, in the bolt end processing method according to the present invention, the tip of the bolt is cut while sucking and collecting dust in the outer sleeve, so that dust can be collected efficiently. Since the blade can be cooled by the outside air flowing into the outer sleeve from the gap between the nut and the outer sleeve, it is possible to prevent the blade from being thermally deteriorated due to a temperature rise due to heat generated during cutting.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bolt end processing device 10 sucks a portable processing device main body 11 that processes the end of a bolt 1 that has been constructed into a smooth surface, and chips generated in the processing device main body 11. For example, the front ends of the plurality of bolts 1 fastened to the flange portion 5a of the H-shaped steel 5 and the gusset plate 6 are sequentially processed into a smooth surface.

  Here, the bolt 1 to be cut by the bolt end processing device 10 is a torcia-type bolt, and as shown in FIG. A pin tail 4 is formed on the tip side of the pin 3. For example, when the flange portion 5a of the H-shaped steel 5 and the gusset plate 6 are coupled with the bolt 1, the mounting holes formed in the flange portion 5a and the gusset plate 6 as shown in FIG. 9 (b) with the bolt 1 attached to the nut 7, the nut 2 screwed onto the tip of the bolt 1, and the nut 2 and the pin tail 4 held in the socket of a shear wrench (not shown). As shown, the bolt 1 is fastened to the nut 2 until the bolt 1 breaks along the breaking groove 3, and the flange portion 5a and the gusset plate are coupled. For this reason, in this bolt 1, although the bolt 1 can be reliably fastened with torque more than a required torque, the front-end | tip part 1a of the bolt 1 after construction will be comprised by the fracture surface which is easy to rust. The present invention is suitable for processing the tip 1a of such a bolt 1 into a smooth surface on which a rust preventive paint is easy to ride. However, even for a bolt having a general configuration, it is also possible to smoothly machine the tip portion using the bolt end processing apparatus 10 after the construction.

  As shown in FIGS. 1 to 7, the processing apparatus main body 11 is portable so that an operator can operate it while supporting it with both hands. An external sleeve 12 that can be fitted, a blade 13 that cuts the tip of the bolt 1, and a drive unit 14 that rotates the blade 13 are provided in the external sleeve 12 so as to be relatively rotatable with a certain gap therebetween. .

  The driving means 14 includes an electric motor (not shown) and a speed reducer incorporated in the casing 15, and a tool is detachably held on a chuck 17 provided on the output shaft 16 of the speed reducer, so that a push button type power switch is provided. 18, the chuck 17 is configured to be able to rotate at a reduced speed, and is configured by a main body device such as a general-purpose electric drill. However, it is preferable to use a main body device such as a general-purpose electric drill as the driving means 14 in order to reduce the manufacturing cost. However, the driving means 14 may have any configuration as long as the chuck 17 can be rotationally driven by the electric motor. Can be adopted.

  The outer sleeve 12 includes a fixed sleeve 20 that is externally fitted and fixed to the distal end portion of the chuck 17, a connecting sleeve 22 that is rotatably mounted on the fixed sleeve 20 via a bearing 21 and is not movable in the axial direction, and a base end portion. An extension sleeve 23 fitted and fixed to the distal end portion of the connecting sleeve 22 by welding, a socket holding member 24 fitted and fixed to the distal end portion of the extension sleeve 23, and a socket 25 detachably attached to the socket holding member 24. I have.

  The fixed sleeve 20 is fixed to the chuck 17 by using two fixing screws 26, and a bearing 21 is externally fixed to the fixed sleeve 20 so as not to move in the axial direction. The socket 25 is configured as a shear wrench socket, and on the inner peripheral surface of the socket 25, twelve engagement grooves 25 a that fit into the nut 2 are formed in the axial direction. A ring-shaped flange 27 is formed on the outer periphery of the socket 25 so as to protrude outward, and four engagement notches 28 are formed in the flange 27 at intervals in the circumferential direction. An engagement protrusion 29 that engages with the engagement notch 28 is formed in a protruding shape at the tip of the socket holding member 24, and the socket 25 has the engagement notch 28 engaged with the engagement protrusion 29. The two fixing screws 30 are fastened to be attached to the socket holding member 24 so as not to rotate relative to each other. The connecting sleeve 22, the extension sleeve 23, the socket holding member 24, and the socket 25 can be formed as an integral member, but at least the socket 25 can be replaced according to the size of the nut 2 to be fitted. Since it comprises, it is preferable to comprise by another member. Further, in the present embodiment, the outer sleeve 12 is rotatably attached to the chuck 17, but the fixed sleeve 20 and the bearing 21 are omitted, and the base end portion of the connecting sleeve 22 is attached to the casing 15 of the driving means 14. It is also possible to fix. In this case, the cutting reaction force by the blade 13 can be received by the nut 2 via the casing 15 and the outer sleeve.

  The blade 13 will be described. As shown in FIGS. 3 to 7, a bottomed cylindrical holder member 32 having a shaft portion 31 that is detachably fixed to the chuck 17 is provided. A bearing 33 is provided between the sleeves 12, and the holder member 32 is rotatably provided coaxially with the outer sleeve 12 via the bearing 33. In the holder member 32, a first cutting tool 13A for cutting the tip 1a of the bolt 1 is fitted. The first cutter 13A is constituted by a general end mill, and is detachably fixed to the holder member 32 by two fixing screws 34, and the tip 1a of the bolt 1 is cut by the tip of the first cutter 13A. It will be. A second cutter 13 </ b> B for chamfering the outer periphery of the tip of the bolt 1 is provided at the tip of the holder member 32. The second cutter 13B includes twelve substantially triangular tips 35 brazed at regular intervals in the circumferential direction so that the tip outer peripheral portion 1b of the bolt 1 can be chamfered in an inclined shape by cutting. It is composed. The number of chips 35 can be arbitrarily set, but it is preferably set to 6 to 12 so that the cutting efficiency of the first blade 13A and the second blade 13B is the same. 13 A of 1st cutters and the 2nd cutter 13B are provided in the positional relationship which can cut the front-end | tip part 1a and the front-end | tip outer peripheral part 1b of the volt | bolt 1 simultaneously. Further, at least cutting is performed between the tip of the socket 25 and the washer 8 of the nut 2 in a state where the cutter 13 is in contact with the tip 1 a of the bolt 1 so that the cutter 13 can cut the tip 1 a of the bolt 1. The blade 13 is arranged in the outer sleeve 12 so that a gap T corresponding to the necessary feed amount is formed.

  A plurality of discharge holes 36 for discharging chips are formed in the middle of the length direction of the holder member 32 at intervals in the circumferential direction, and the chips enter the gap between the first blade 13A and the holder member 32. Is configured to be discharged out of the holder member 32 from the discharge hole 36 by centrifugal force when the blade 13 rotates. Further, the air in the gap between the first blade 13A and the holder member 32 is discharged to the outside of the holder member 32 through the discharge hole 36, and an air flow is formed in the exterior sleeve 12. Therefore, the blade 13 is caused by the air flow. It is possible to prevent the blade 13 from being thermally deteriorated by heat generated during cutting. In particular, when the chips are sucked by the suction machine 40, the cooling efficiency of the blade 13 can be further increased. As the discharge hole 36, a hole having an arbitrary shape can be formed. For example, an elongated hole that is elliptical or elongated in the axial direction or the circumferential direction can be provided.

  As shown in FIG. 8A, the tip 1a of the bolt 1 is cut into a flat surface perpendicular to the axial direction of the bolt 1 by cutting the tip 1a of the bolt 1 with a first cutter 13A, and the second cutter 13B. Thus, the tip outer peripheral portion 1b of the bolt 1 is cut into an inclined surface, but a corner portion 1c is formed at the boundary portion between the outer peripheral surface and the inclined surface of the bolt 1 and at the boundary portion between the inclined surface and the flat surface. Since the film thickness of the anticorrosive paint is inevitably thin at the corner portion 1c, as shown in FIG. 8 (b), a rounded portion 1d is formed at the corner portion 1c so that the outer peripheral surface and the flat surface of the bolt 1 are smooth. It is preferable to perform cutting so as to be continuous with. Moreover, as shown in FIG.8 (c), by adjusting the shape of the cutter 13, it can cut to the taper-shaped front-end | tip part 1e which becomes a small diameter as it goes to a front end side, FIG.8 (d). As shown in FIG. 5, it is also possible to form the tip portion 1f having a partial spherical shape or hemispherical shape.

  The shape of the tip 1a of the bolt 1 after cutting is uniform by preventing the rust-proof coating on the end of the bolt 1 from getting worse and the coating from becoming partially thin. Any configuration can be used as long as it is configured to form a coating film with an appropriate thickness. Further, as the blade 13, the holder member 32 and the second blade 13B are omitted, and the first blade 13A is held directly with respect to the chuck 17, and only the tip 1a of the bolt 1 is cut. Is also possible. Moreover, it replaces with at least one of the 1st cutter 13A and the 2nd cutter 13B, a grindstone can be provided, and the front-end | tip part 1a of the volt | bolt 1 can also be ground.

  As shown in FIG. 1, the suction machine 40 sucks chips in the outer sleeve 12 and can adopt a canister type vacuum cleaner that can be moved by a caster. Since the floor surface is not flat or the building material is installed on the floor surface, it is preferable that the cleaner is configured to be used on the shoulder or on the back. As the dust collection method, a cyclone type can be adopted, but it is preferable to adopt a filter type vacuum cleaner having a high suction force so that metal chips can be sucked efficiently.

  2 to 4, the hose 41 of the suction machine 40 is connected to the middle part of the outer sleeve 12, and the suction machine 40 is operated to suck chips in the outer sleeve 12 together with air. It is configured as follows. The connection position of the hose 41 with respect to the outer sleeve 12 is preferably set near the tip of the blade 13 so that chips can be sucked efficiently, but provided at an arbitrary position as long as it is in front of the bearing 33. Can do. In the present embodiment, in order to allow a general-purpose product to be used as the socket 25 fitted on the nut 2, the extension sleeve 23 is connected to the vicinity of the tip. Further, by sucking the chips in the outer sleeve 12 together with air by the suction machine 40, outside air is introduced into the outer sleeve 12 from the gap between the nut 2 and the socket 25, so that the blade 13 is heated by heat generated during cutting. It is preferable because the temperature rise can be suppressed and thermal deterioration of the blade 13 can be prevented. However, the suction device 40 is not necessarily provided, and every time the tip of the bolt 1 is cut, it is possible to discharge the chips in the outer sleeve 12 to a trash box or the like with the socket 25 side facing down. . In addition, an opening for discharging chips can be formed in the lower portion of the socket 25, and a storage case for temporarily storing chips discharged from the opening can be detachably provided below the socket 25.

  When cutting the tip of the bolt 1 with the bolt end processing apparatus 10, first, as shown in FIG. 1, while holding the suction apparatus 40 on the back and holding the processing apparatus main body 11 with both hands, the processing apparatus main body 11. The socket 25 at the tip end of the outer sleeve 12 attached to is inserted into the nut 2 so that the axis of the blade 13 is aligned with the axis of the bolt 1. At this time, as shown in FIG. 6, the socket 25 cannot be inserted to the base end portion of the nut 2 because the tip end of the blade 13 abuts on the tip end portion of the bolt 1, but the axial direction of the nut 2 is not possible. Since 80 to 90% can be inserted, the axis of the cutter 13 and the axis of the bolt 1 can be easily matched.

  Next, while rotating the blade 13 by the driving means 14 of the processing apparatus main body 11, the end portion of the bolt 1 is cut by pressing the end portion of the blade 13 against the end portion of the bolt 1. Specifically, the tip 1a of the bolt 1 is cut into a smooth surface by the first cutter 13A, and the tip outer periphery 1b of the bolt 1 is formed so that the corner 1c is not formed on the tip outer periphery 1b of the bolt 1. Will be chamfered. Cutting with the blade 13 is performed in the outer sleeve 12, and the tip opening of the outer sleeve 12 is closed by the nut 2. Therefore, chips generated during cutting remain in the outer sleeve 12 and are scattered outside. There is nothing. Further, a part of the chips enter the gap between the first blade 13A and the holder member 32, but are discharged into the outer sleeve 12 through the discharge hole 36 by the centrifugal force when the blade 13 is rotated and clogged. There is no.

  On the other hand, when cutting the tip 1a of the bolt 1, the suction machine 40 is operated to suck chips generated during the cutting and collect them in a dust collection bag or the like (not shown) of the suction machine 40. When the chips in the outer sleeve 12 are sucked, outside air is introduced into the outer sleeve 12 through the gap between the socket 25 and the nut 2. For this reason, the chips are prevented from spilling to the outside from the gap between the socket 25 and the nut 2, and the blade 13 is cooled by the outside air introduced into the exterior sleeve 12, and the blade 13 is thermally deteriorated. Will be prevented. Moreover, a part of the outside air introduced into the exterior sleeve 12 passes through the gap between the first blade 13A and the holder member 32 and returns to the exterior sleeve 12 from the discharge hole 36. Therefore, the first blade 13A and the holder The blade 13 is also efficiently cooled by the air flowing through the gaps between the members 32. The suction machine 40 can be operated as needed by manual operation, or can be operated in conjunction with the driving means 14. In addition, after processing the front-end | tip part 1a and the front-end | tip outer peripheral part 1b of the volt | bolt 1 in this way to a smooth surface sequentially, the operation | work which applies a rust preventive paint to a process surface is performed sequentially, and corrosion of the volt | bolt 1 is prevented. become.

  In this bolt end processing apparatus 10, since the tip of the bolt 1 can be cut with the socket 25 inserted into the nut 2 and the axis of the cutter 13 aligned with the axis of the bolt 1, the tip of the bolt 1 can be cut. 1a and the outer peripheral portion 1b of the tip can be cut smoothly, a clean surface with uniform quality can be obtained, and the blade 13 is pressed by the blade 13 being inclined with respect to the bolt 1. 13 can be prevented from being damaged. Moreover, since the edge part of the volt | bolt 1 is cut in the exterior sleeve 12, scattering of the chip generated at the time of cutting can be prevented. In addition, since the chips generated during cutting are sucked by the suction device 40, the chips can be easily collected and the blade 13 can be cooled by the outside air introduced into the outer sleeve 12. It is possible to prevent the blade 13 from being thermally deteriorated. Furthermore, since the front end portion of the bolt 1 is processed into a smooth surface by cutting, the processing time of the front end portion of the bolt 1 can be greatly shortened as compared with the case of processing by grinding.

Explanatory drawing of bolt end processing equipment Side view of main body Disassembled perspective view of exterior sleeve and blade Longitudinal sectional view of the main body of the processing equipment in the vicinity of the outer sleeve Exploded view of blade Explanatory drawing of how to use bolt end processing equipment Front view of blade (A)-(d) is a side view which shows the shape of the front-end | tip part of a volt | bolt. (A) (b) is explanatory drawing of the fastening method of a Torcia bolt

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bolt 1a Front-end | tip part 1b Front-end | tip outer peripheral part 1c Corner | angular part 1d Earl 1e Tip part 1f Tip part 2 Nut 3 Breaking groove 4 Pintail 5 H-shaped steel 5a Flange part 6 Gusset plate 7 Mounting hole 8 Washer 10 Bolt end processing apparatus 11 Processing apparatus Main body 12 Exterior sleeve 13 Blade 13A First blade 13B Second blade 14 Driving means 15 Casing 16 Output shaft 17 Chuck 18 Power switch 20 Fixed sleeve 21 Bearing 22 Connection sleeve 23 Extension sleeve 24 Socket holding member 25 Socket 25a Engaging groove 26 Fixed Screw 27 Hook 28 Engagement notch 29 Engagement projection 30 Fixing screw 31 Shaft 32 Holder member 33 Bearing 34 Fixing screw 35 Tip 36 Discharge hole 40 Suction machine 41 Hose

Claims (12)

It is a portable bolt end processing device that processes the installed bolt end into a smooth surface,
An outer sleeve in which a tip portion can be fitted to the nut fastened to the bolt with almost no gap; and
A first cutter that is mounted in the outer sleeve so as to be relatively rotatable with a certain gap, and that cuts the tip of the bolt;
Driving means for rotating the first blade;
Bolt end processing apparatus.   The second cutter that chamfers the outer peripheral portion of the tip of the bolt is externally fitted and fixed to the first cutter, and the first cutter and the second cutter are internally mounted in an external sleeve so as to be relatively rotatable with a certain gap. Bolt end processing equipment.   A holder member that is externally fitted and fixed to the first blade is provided, a second blade is provided at the tip of the holder member, and a discharge hole that discharges chips that have entered between the first blade and the holder member to the outside is provided in the holder member. The bolt end processing apparatus according to claim 2 formed.   The bolt end processing apparatus according to any one of claims 1 to 3, further comprising a suction device for sucking chips in the outer sleeve.   The bolt end processing apparatus according to any one of claims 1 to 4, wherein a base end portion of the exterior sleeve is externally fitted and fixed to a chuck of the driving unit so as to be relatively rotatable.   The bolt end portion according to any one of claims 1 to 5, wherein either one of the first cutter and the second cutter is configured by a grindstone, and either one of the tip end portion of the bolt and the tip outer peripheral portion of the bolt is ground. Processing equipment.   The bolt end processing apparatus according to any one of claims 1 to 6, wherein the bolt is a torcia bolt. A bolt end processing method for processing a bolt end that has been constructed into a smooth surface,
The outer sleeve is fitted onto the nut fastened to the bolt without any gap, and the shaft center of the outer sleeve is positioned coaxially with the axis of the bolt, and the chips in the outer sleeve are sucked and collected. A bolt end processing method of rotating a first cutter housed in an outer sleeve while dusting and cutting a tip end portion of a bolt with the first cutter.   The bolt end portion according to claim 8, wherein a second cutter that chamfers the outer peripheral portion of the bolt is fitted and fixed to the first cutter, and the front end portion and the outer peripheral portion of the bolt are simultaneously cut by the first cutter and the second cutter. Processing method.   A holder member that is externally fitted and fixed to the first cutter is provided, a second cutter is provided at the tip of the holder member, and chips that have entered between the first cutter and the holder member are discharged from a discharge hole formed in the holder member. The bolt end processing method according to claim 9, wherein the bolt end is cut.   The bolt end according to any one of claims 8 to 10, wherein either one of the first cutter and the second cutter is constituted by a grindstone, and either one of a tip end portion of the bolt and a tip outer peripheral portion of the bolt is ground. Processing method. The bolt end treatment method according to any one of claims 8 to 11, wherein the bolt is a Torcia bolt.

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