Machine body, guide pad and hole machining tool

Abstract

The invention provides a main body with a guide part, a guide pad and a hole processing tool, and the guide part can restrain welding caused by heat generated by friction during processing and prolong service life. A machine body (100) of a hole processing tool (10) is provided with: a cylindrical main body (110); and a guide part (300) provided on the outer periphery of the main body (110). The guide section (300) has: a holding groove (320) formed in the main body (110); and a rotating body (330) which is accommodated in the holding groove (320) in a rotatable manner.

Description

Technical Field

[0001] The invention relates to a fuselage, a guide pad and a hole processing tool. Background Art

[0002] As described in Patent Documents 1 and 2 below, a guide pad is provided at the front end of the body of a hole-making tool, such as a BTA tool or a gun drill, in addition to the cutting edge. While a force acting in an offset direction is applied to the cutting edge during hole-making, the guide pad abuts the inner surface of the hole in the workpiece, suppressing deformation of the body caused by this force. This enables high-precision hole-making.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2015-77679

[0006] Patent Document 2: International Publication No. 2011 / 142370 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] Furthermore, the guide pad is pressed against the inner surface of the workpiece hole and slides, ensuring the straightness of the hole. Therefore, especially when the tool has a large diameter or the workpiece is made of a material that easily generates heat, the heat generated by the polishing torque (friction) can cause welding, shortening the service life.

[0009] An object of the present invention is to provide a body, a guide pad, and a hole processing tool having a guide portion, wherein the guide portion can suppress welding caused by heat generated by friction during processing and extend the service life.

[0010] Solutions to the Problem

[0011] According to one aspect of the present invention, the body is the body of a hole processing tool, which comprises: a main body formed in a cylindrical shape, and a guide portion arranged on the outer periphery of the main body; the guide portion has: a retaining groove formed on the main body, and a rotating body rotatably accommodated in the retaining groove.

[0012] In the machine body with the above structure, the rotating element of the guide portion, held in the retaining groove of the main body, rotates while in contact with the inner surface of the hole in the workpiece during machining. This prevents welding caused by the heat generated by the main body guiding and rubbing against the inner surface of the hole in the workpiece during machining, thereby extending the service life.

[0013] The rotor may be replaceable.

[0014] The retaining groove may extend along the rotation center axis of the main body, and the plurality of rotating bodies may be accommodated and arranged in the retaining groove.

[0015] The rotating body may be formed in a cylindrical shape and held in the holding groove so as to be rotatable about a central axis in the same direction as the rotational central axis of the main body.

[0016] The rotating body may be formed in a spherical shape.

[0017] A hole drilling tool according to one aspect of the present invention includes: the body described above; and a cutting insert mounted on the body.

[0018] A guide pad according to one aspect of the present invention is mounted on the outer periphery of a body of a hole machining tool and includes a base having a retaining groove and a rotating body rotatably received in the retaining groove.

[0019] The rotor may be replaceable.

[0020] A plurality of rotating bodies can be accommodated and arranged in a row in the holding groove.

[0021] The rotating body may be formed in a cylindrical shape and held in the holding groove so as to be rotatable about the same central axis.

[0022] The rotating body may be formed in a spherical shape.

[0023] The base portion can be fixed to the body by a fastening member, and the fastening member can prevent the rotating body from falling out of the holding groove.

[0024] A hole drilling tool according to one aspect of the present invention includes: the guide pad described above; a body to which the guide pad is mounted; and a cutting insert mounted on the body.

[0025] Effects of the Invention

[0026] According to the present invention, a body, a guide pad, and a hole machining tool are provided, wherein the guide portion can suppress welding caused by heat generated by friction during machining and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a perspective view showing the overall structure of the hole drilling tool according to the first embodiment.

[0028] Figure 2 It is a three-dimensional view of the guide part provided on the fuselage.

[0029] Figure 3 for Figure 2 Section III-III in the figure.

[0030] Figure 4 A perspective view of a guide portion of a modified example.

[0031] Figure 5 It is a perspective view showing the overall structure of a hole drilling tool according to a second embodiment.

[0032] Figure 6 A perspective view of a guide pad mounted on a main body.

[0033] Description of Reference Numerals

[0034] 10, 20: Hole processing tools

[0035] 100: Body

[0036] 110: Main body

[0037] 200: Cutting blade

[0038] 300, 300A: Guide part

[0039] 320, 420: holding slot

[0040] 330, 330A, 430: Rotating body

[0041] 400: Guide pad

[0042] 410: Base

[0043] 426: Screws (Fasteners)

[0044] AX1: Rotation center axis DETAILED DESCRIPTION

[0045] Hereinafter, the present embodiment will be described with reference to the accompanying drawings. To facilitate understanding of the description, identical elements in the drawings are denoted by identical reference numerals as much as possible, and the subsequent description will not be repeated.

[0046] (First embodiment)

[0047] First, the structure of the hole machining tool 10 of the first embodiment will be described. The hole machining tool 10 is a cutting tool for forming a hole in a workpiece (not shown), and is also called a so-called "BTA tool". Figure 1 As shown, the hole drilling tool 10 includes a body 100 and a cutting insert 200 .

[0048] The body 100 is a substantially integral member of the drilling tool 10 and is formed of steel. The body 100 includes a connecting portion 120. The connecting portion 120 is a portion along one side of the body 100 in its longitudinal direction and is connected to a drill pipe when the tool is mounted on a machine tool (not shown).

[0049] For convenience of description, the end portion of the body 100 where the connection portion 120 is provided is hereinafter referred to as the “base end side.” In addition, the side opposite to the base end side is hereinafter referred to as the “front end side.”

[0050] The body 100 is formed to extend linearly from the connecting portion 120 toward the front end. The body 100 has a substantially cylindrical main body 110, with a recess 111 formed at the front end by notching a portion of the side surface. A cutting insert 200, described below, is mounted on the inner surface of the recess 111.

[0051] The cutting blade 200 is a portion having a cutting edge 210, and is formed of a super-hard alloy. The cutting blade 200 may also be formed of a material other than a super-hard alloy. The cutting blade 200 is detachably mounted on a blade seat at one end of the length direction of the knife box by means of a screw 270 that passes through the cutting blade 200, and the knife box is fastened to a position near the end on the front end side of the inner surface of the recess 111 by means of a screw. The cutting edge 210 of the cutting blade 200 further protrudes from the front end of the body 100 toward the front end side. When processing the workpiece, the body 100 rotates around the rotation center axis AX1. Its rotation direction is Figure 1 In the direction indicated by the middle arrow AR1. When the body 100 rotates, the workpiece is cut by cutting into the cutting edge 210, and a hole is formed in the workpiece. The hole processing tool 10 of this embodiment is a so-called "box-type" tool consisting of a cutting blade 200 having a cutting edge 210 as described above and other components capable of replacing a knife box. Therefore, if the knife box is replaced with another shape, cutting blades 200 of different shapes can be used. In addition, even if it is a knife box of the same shape, when the periphery of the blade seat in the knife box is damaged, only the knife box can be replaced, thereby extending the tool life of the body 100.

[0052] The body 100 includes a guide portion 300 on the main body 110. The guide portion 300 contacts the inner surface of the hole in the workpiece during machining, thereby suppressing vibrations of the body 100. The hole formed in the workpiece by machining with the hole drilling tool 10 is hereinafter referred to as the "machined hole." The guide portion 300 allows machining while maintaining the straightness and roundness of the machined hole.

[0053] When the cutting edge 210 is provided at only one location in the circumferential direction, as in this embodiment, a biasing force is applied to the hole machining tool 10 during machining. Therefore, by providing the guide portion 300 at a position capable of withstanding this force, deformation of the body 100 during machining can be suppressed, thereby maintaining the straightness and roundness of the machined hole as described above.

[0054] A guide portion 300 is provided on the outer periphery of the main body 110 near the front end of the body 100. In this embodiment, three guide portions 300 are provided around the main body 110, arranged circumferentially. It should be noted that the number of guide portions 300 provided on the main body 110 may differ from that in this embodiment. For example, one, two, or four or more guide portions may be provided.

[0055] The specific structure of the guide portion 300 is described below. Figure 2 and Figure 3 As shown, the guide portion 300 has a holding groove 320 and a rotating body 330 .

[0056] The retaining groove 320 is formed on the main body 110. The retaining groove 320 extends along the rotation center axis AX1 of the main body 110. A plurality of rotating bodies 330 are provided. In this embodiment, four rotating bodies 330 are provided on one guide portion 300. These rotating bodies 330 are rotatably accommodated in the retaining groove 320 and are arranged along the rotation center axis AX1 of the main body 110. It should be noted that the number of rotating bodies 330 provided on the guide portion 300 may also be different from that in this embodiment. For example, the guide portion 300 may also be provided with one rotating body 330.

[0057] The rotating bodies 330 are formed in a cylindrical shape and are held in the holding grooves 320 so as to be rotatable around a central axis that is in the same direction as the rotational central axis AX1 of the main body 110 .

[0058] The retaining groove 320 has a width slightly larger than the outer diameter of the rotating body 330. Furthermore, the retaining groove 320 has protruding portions 321 extending toward each other at both edges of the outer periphery of the main body 110. The groove width at the upper edge is narrower than the diameter of the rotating body 330. This prevents the rotating body 330 housed in the retaining groove 320 from falling out of the outer periphery of the main body 110 within the retaining groove 320. A portion of the rotating body 330 housed in the retaining groove 320 is retained protruding from the outer periphery of the main body 110 within the retaining groove 320.

[0059] The retaining groove 320 has a front end opening portion 322 on the front end side of the main body 110. The bottom 322a of the front end opening portion 322 is arranged radially outward from the main body 110 relative to the bottom surface 320a of the retaining groove 320. For example, the height of the bottom 322a of the front end opening portion 322 is approximately the center position of the rotating body 330 accommodated in the retaining groove 320. Thus, the rotating body 330 is accommodated in the retaining groove 320 and does not fall off from the front end side of the main body 110. In addition, by providing the front end opening portion 322 in the retaining groove 320, the rotating body 330 can be arranged as close to the front end side of the main body 110 as possible, which can further improve the guiding function of the guide portion 300.

[0060] In addition, a groove portion 324 is formed on the rear end side of the main body 110 of the retaining groove 320. Thus, the retaining groove 320 has a rear end opening portion 323 on the rear end side of the main body 110 that is connected to the groove portion 324. The bottom surface 324a of the groove portion 324 is flush with the bottom surface 320a of the retaining groove 320. Therefore, the rear end opening portion 323 is completely open in the groove portion 324. It should be noted that the bottom surface 324a of the groove portion 324 can also be located closer to the radial inner side of the main body 110 than the bottom surface 320a of the retaining groove 320.

[0061] A stopper member 325 is embedded in the groove 324. The stopper member 325 is rectangular and is secured to the main body 110 by screws 326. By inserting and securing the stopper member 325 in the groove 324, the rear end opening 323 of the retaining groove 320 is closed. This prevents the rotating body 330 from escaping from the rear end opening 323 and maintains its position within the retaining groove 320.

[0062] In the guide portion 300, the rotating bodies 330 are sequentially inserted from the rear end opening 323 into the retaining groove 320, whereby they are accommodated in a row in the retaining groove 320. Furthermore, with the rotating bodies 330 accommodated, the stopper member 325 is inserted into the groove 324 and fixed to the main body 110 by a screw 326, thereby maintaining the rotating bodies 330 rotatably accommodated in the retaining groove 320.

[0063] By providing the guide portion 300 on the body 100, the cylindrical rotating body 330 of the guide portion 300 rotates while the hole machining tool 10 is in contact with the inner surface of the hole in the workpiece. This suppresses vibrations of the body 100 during machining, allowing machining to proceed while maintaining the straightness and roundness of the machined hole.

[0064] In this way, in the body 100 and the hole processing tool 10 having the guide part 300 with the rotating body 330, since the rotating body 330 of the guide part 300 held in the retaining groove 320 of the main body 110 abuts against the inner surface of the hole of the cut workpiece and rotates during processing, it is possible to suppress welding caused by the heat generated by guiding and rubbing the main body 110 relative to the inner surface of the hole of the cut workpiece during processing, thereby achieving an extended service life.

[0065] Furthermore, since the plurality of rotating bodies 330 are accommodated and arranged in the retaining groove 320 extending along the rotation center axis AX1 of the main body 110 , the main body 110 can be guided in a balanced and stable manner relative to the inner surface of the hole of the workpiece.

[0066] Furthermore, according to the guide portion 300 having a plurality of rotating bodies 330, even if the groove portion 324 formed on the main body 110 is shortened in order to accommodate the rotating body 330 in the retaining groove 320, a contact surface longer than the inner circumference of the machined hole of the workpiece can be obtained. This reduces the volume of the cutout of the main body 110 and stably guides the main body 110 without reducing the rigidity of the tool. In addition, when replacing a worn rotating body 330, only the worn rotating body 330 needs to be replaced, which is economical. Moreover, since the mass of one rotating body 330 can be reduced, the rotating body 330 can be rotated with less force, and the frictional resistance as rotational friction can be suppressed. In addition, by regularly replacing the positions of the plurality of rotating bodies 330, each rotating body 330 can be evenly worn, and the replacement period of each rotating body 330 can be made consistent.

[0067] It should be noted that while the first embodiment described above illustrates a guide portion 300 having a cylindrical rotating body 330, the rotating body 330 is not limited to a cylindrical shape. Next, a guide portion 300A, which is a modified example having a rotating body 330 in another shape, will be described. Components identical to those in the aforementioned exemplary configuration are designated by the same reference numerals and will not be repeated.

[0068] like Figure 4 As shown, the guide portion 300A of the modified example includes a plurality of spherical rotating bodies 330A. In this guide portion 300A, the spherical rotating bodies 330A are sequentially inserted from the rear end opening 323 into the retaining groove 320, and are thereby accommodated in a row within the retaining groove 320. Furthermore, with these rotating bodies 330A accommodated, a stopper member 325 is inserted into the groove 324 and secured to the main body 110 by a screw 326, thereby maintaining the rotating bodies 330A rotatably accommodated within the retaining groove 320.

[0069] By attaching the guide portion 300A to the body 100, the spherical rotor 330A of the guide portion 300A rotates in contact with the inner surface of the hole in the workpiece during machining. This suppresses vibrations of the body 100 during machining, allowing machining to proceed while maintaining the straightness and roundness of the machined hole. In particular, the spherical rotor 330A rotates in contact with the inner surface of the hole in the workpiece, further reducing the contact area with the inner surface and friction.

[0070] (Second embodiment)

[0071] Next, the second embodiment will be described. It should be noted that the same components as those in the first embodiment are denoted by the same reference numerals, and their description will not be repeated.

[0072] like Figure 5 As shown, the hole machining tool 20 of the second embodiment has a guide pad 400 mounted on the body 100 .

[0073] The housing 100 has recesses 114 spaced apart in the circumferential direction on the main body 110. The guide pad 400 is mounted in a state of being fitted into the recesses 114 of the main body 110. The guide pad 400 is mounted on the main body 110 along its rotational center axis AX1.

[0074] like Figure 6 As shown, the guide pad 400 includes a base portion 410 and a rotating body 430. The base portion 410 is formed into a rectangular shape when viewed from above. The base portion 410 is inserted into the recess 114 of the main body 110, and the center portion in the longitudinal direction is fastened to the main body 110 by a screw (fastening member) 426.

[0075] The base portion 410 is bounded by a central portion in the longitudinal direction and has a retaining groove 420 at one end. The retaining groove 420 extends along the longitudinal direction of the base portion 410. A plurality of rotating bodies 430 are provided. In this embodiment, four rotating bodies 430 are provided on one guide pad 400. These rotating bodies 430 are rotatably accommodated in the retaining groove 420 and are arranged along the longitudinal direction of the base portion 410. It should be noted that the number of rotating bodies 430 provided on the guide pad 400 may also be different from that in this embodiment. For example, the guide pad 400 may be provided with one rotating body 430.

[0076] The rotating bodies 430 are formed in a cylindrical shape and are held in the holding grooves 420 so as to be rotatable about a central axis in the same direction as the rotational central axis AX1 of the main body 110 when the guide pad 400 is mounted on the main body 110 .

[0077] The retaining groove 420 has a width slightly larger than the outer diameter of the rotating body 430. Furthermore, the retaining groove 420 has two protruding portions 421 on its upper edges, extending toward each other. The groove width at the upper edge is narrower than the diameter of the rotating body 430. This prevents the rotating body 430 housed in the retaining groove 420 from falling out of the upper portion of the retaining groove 420. Furthermore, the rotating body 430 housed in the retaining groove 420 is retained with a portion protruding from the upper surface of the retaining groove 420.

[0078] The retaining groove 420 has a front end opening portion 422 on the end side. The bottom 422a of the front end opening portion 422 is arranged on the upper surface side of the base portion 410 that is closer to the bottom surface of the retaining groove 420. For example, the height of the bottom 422a of the front end opening portion 422 is approximately the center position of the rotating body 430 accommodated in the retaining groove 420. As a result, the rotating body 430 is accommodated in the retaining groove 420 and does not fall off from the end side of the base portion 410. In addition, by providing the front end opening portion 422 in the retaining groove 420, when the guide pad 400 is mounted on the main body 110 of the fuselage 100, the rotating body 430 can be arranged as close to the front end side of the main body 110 as possible, which can further improve the guiding function of the guide pad 400.

[0079] Furthermore, a countersink 424 is formed in the center of the base portion 410. Consequently, the retaining groove 420 has a rear end opening 423 in the center of the base portion 410 that communicates with the countersink 424. The bottom surface 424a of the countersink 424 is flush with the bottom surface of the retaining groove 420. Therefore, the rear end opening 423 is completely open in the countersink 424. It should be noted that the bottom surface 424a of the countersink 424 may also be located further below the base portion 410 than the bottom surface of the retaining groove 420.

[0080] Screws 426 are inserted into countersunk holes 424 to secure guide pad 400 to main body 110. Inserting screws 426 into countersunk holes 424 and securing guide pad 400 to main body 110 closes rear end opening 423 of retaining groove 420. This prevents rotor 430 from escaping from rear end opening 423 and ensures it remains housed in retaining groove 420.

[0081] In this guide pad 400, the rotating bodies 430 are sequentially inserted from the rear end opening 423 into the retaining groove 420, whereupon they are accommodated in a single row within the retaining groove 420. With these rotating bodies 430 accommodated, the guide pad 400 is fitted into the recess 114 of the main body 110, and screws 426 inserted into the countersunk holes 424 of the base 410 are screwed into internal threads (not shown) formed in the main body 110 to secure the guide pad 400 to the main body 110. This maintains the rotating bodies 430 rotatably accommodated within the retaining groove 420. Furthermore, in the guide pad 400, the screws 426 prevent the rotating bodies 430 from falling out of the retaining groove 420, eliminating the need for separate stoppers to prevent them from falling out, thereby reducing the number of components.

[0082] By providing the guide pad 400 on the body 100, the cylindrical rotating body 430 of the guide pad 400 rotates while the hole machining tool 20 is machining, thereby suppressing vibrations of the body 100 during machining and maintaining the straightness and roundness of the machined hole.

[0083] In this way, in the hole processing tool 20 having a guide pad 400 with a rotating body 430, since the rotating body 430 held in the retaining groove 420 of the guide pad 400 abuts against the inner surface of the hole of the cut workpiece and rotates during processing, it is possible to suppress welding caused by the heat generated by guiding and rubbing the body 100 relative to the inner surface of the hole of the cut workpiece during processing, thereby achieving an extended service life.

[0084] Furthermore, since the plurality of rotating bodies 430 are housed and arranged in a row in the holding groove 420 , the body 100 can be guided in a balanced and stable manner relative to the inner surface of the hole of the workpiece.

[0085] Furthermore, with the guide pad 400 having multiple rotating bodies 430, only the worn rotating body 430 needs to be replaced, resulting in a more economical and cost-effective replacement. Furthermore, since the mass of a single rotating body 430 can be reduced, the rotating body 430 can be rotated with less force, thus suppressing frictional resistance caused by rotational friction. Furthermore, by regularly rotating the multiple rotating bodies 430, wear on each rotating body 430 is evenly distributed, allowing for consistent replacement of each rotating body 430.

[0086] It should be noted that, in the second embodiment described above, the guide pad 400 is described as having a cylindrical rotating body 430. However, the rotating body 430 is not limited to a cylindrical shape and may also be spherical. If the rotating body 430 is spherical, the contact area with the inner surface of the hole of the workpiece can be further reduced, thereby further reducing friction.

[0087] Above, the present embodiment has been described with reference to specific examples. However, the present disclosure is not limited to these specific examples. In these specific examples, as long as the features of the present disclosure are possessed, design changes appropriately made by those skilled in the art are also included in the scope of the present disclosure. The various elements and their configurations, conditions, shapes, etc. possessed by the above-mentioned specific examples are not limited to the elements illustrated and can be appropriately changed. As long as the various elements possessed by the above-mentioned specific examples do not cause technical contradictions, their combination can be appropriately changed.

Claims

1. A body of a hole processing tool, comprising: a main body formed into a cylindrical shape; and a guide portion provided on the outer periphery of the main body; The guide portion has: a retaining groove formed on the body; and A rotating body is rotatably received in the retaining groove. The body according to claim 1 , wherein the rotating body is replaceable. 3 . The body according to claim 1 , wherein the holding groove extends along the rotation center axis of the main body, and the plurality of rotating bodies are accommodated and arranged in the holding groove. 4 . The body according to claim 1 , wherein the rotating body is formed in a cylindrical shape and is held in the holding groove so as to be rotatable around a central axis in the same direction as the rotation central axis of the main body. The body according to claim 1 , wherein the rotating body is formed in a spherical shape.

6. A hole processing tool comprising: The body according to any one of claims 1 to 5; and A cutting blade is mounted on the machine body.

7. A guide pad mounted on the outer periphery of a body of a hole machining tool, comprising: a base portion having a retaining groove; and A rotating body is rotatably received in the retaining groove. The guide pad according to claim 7 , wherein the rotating body is replaceable. 9 . The guide pad according to claim 7 , wherein a plurality of the rotating bodies are accommodated and arranged in a row in the retaining groove. 10 . The guide pad according to claim 7 , wherein the rotating body is formed in a cylindrical shape and is held in the holding groove so as to be rotatable around a common central axis.

11. The guide pad according to claim 7, wherein the rotating body is formed in a spherical shape. 12 . The guide pad according to claim 7 , wherein the base portion is fixed to the body via a fastening member, and the fastening member prevents the rotating body from falling out of the retaining groove.

13. A hole processing tool comprising: The guide pad according to any one of claims 7 to 12; A fuselage having the guide pad installed thereon; and A cutting blade is mounted on the machine body.

Images