JP5722194B2 - Chip suction tool - Google Patents

Description

  The present invention relates to a chip suction tool mounted on a machine tool provided with a chip suction device, and more particularly to improvement of a suction structure that improves the recovery efficiency of chips generated during cutting.

  For example, as a chip suction tool that prevents chips from being scattered during workpiece machining, a pair of cutting edges are formed at the tip of the tool body so as to be point-symmetric about the tool axis. In addition, two suction openings are provided so as to correspond to each cutting edge, and a chip suction hole is formed in the tool body so that both the suction openings communicate with each other, penetrate the rear end portion, and follow the axial center. (See, for example, Patent Document 1).

  In the tool having the conventional structure, the suction opening is communicated with the chip suction hole by forming a notch portion adjacent to each of the cutting blades at the tip of the tool.

WO2009 / 107235 Publication

  However, in the conventional chip suction tool, since the suction opening is communicated with the chip suction hole by forming a notch portion at the tip of the tool, the portion provided with the notch portion in the suction opening, Since the opening is greatly opened outward, the suction path area becomes excessive, the suction speed cannot be increased, and the suction efficiency cannot be improved.

  The present invention has been made in view of the above-described conventional situation, and a chip suction tool capable of increasing the suction speed by narrowing the suction path area at the tip of the tool with a simple structure, thereby improving the efficiency of chip recovery. The issue is to provide.

  The invention of claim 1 includes a tool body having a chip suction hole that opens at the tip, a center blade mounted on the tool axis side of the tip of the tool body, and an outer blade mounted on the outer periphery. A chip suction tool mounted on a machine tool having a chip suction device, wherein the chip suction hole is opened in the vicinity of the central blade and in the vicinity of the outer peripheral blade. The outer peripheral suction hole, the central suction hole and the outer peripheral suction hole merge, and are formed so as to extend along the tool axis, and communicate with the chip suction device. Side walls that extend in the circumferential direction of the tool body and narrow the suction path area of the opening are formed outside the opening of the central suction hole.

  According to a second aspect of the present invention, in the chip suction tool according to the first aspect, the opening of the outer peripheral suction hole is located radially outward from the opening of the central suction hole. .

  According to a third aspect of the present invention, in the chip suction tool according to the first or second aspect, a groove extending in a tool axis direction is formed in the outer surface of the tool main body, and a tip of the tool main body is provided at the tip portion of the tool main body. A notch for communicating the groove with the opening is formed.

  According to a fourth aspect of the present invention, in the chip suction tool according to any one of the first to third aspects, the tip end portion of the tool body is recessed in a direction in which the tool axis portion is farther from the tool tip than the outer peripheral portion. It is characterized by.

  According to the first aspect of the present invention, the central suction hole opened in the vicinity of the central blade and the outer peripheral suction hole opened in the vicinity of the outer peripheral blade are merged with the main suction hole, and the opening of the central suction hole of the tool body is formed. Since the side wall extending in the circumferential direction of the tool body is formed on the outside of the part, the suction path area to the opening of the central suction hole can be reduced. Thereby, the flow velocity of the suction air can be increased, and the suction efficiency can be improved by reliably sucking chips.

  In addition, since the side wall is formed outside the opening of the central suction hole, chips that try to jump outward from the processing point hit the side wall to be prevented from being scattered and easily sucked into the central suction hole. Therefore, the suction efficiency can be improved.

  Here, since the suction path area is large in the region from the processing point of the cutting blade to the opening portion of the suction hole, the flow velocity is lowered, and thus the suction efficiency is lowered accordingly. In the present invention, since the outer peripheral blade is disposed radially outward, the region from the processing point of the outer peripheral blade to the opening of the outer peripheral suction hole is larger than the region of the central blade disposed on the axial center side. Become. Therefore, in the invention of claim 2, since the opening of the outer peripheral suction hole is positioned radially outward from the opening of the central suction hole, the region from the processing point of the outer peripheral blade to the opening of the outer peripheral suction hole is The increase in size can be suppressed, chips can be reliably sucked, and a reduction in suction efficiency can be avoided.

  In the invention of claim 3, a groove extending in the tool axis direction is formed in the outer surface of the tool body, and a notch for communicating the groove with the opening is formed. The working air can be introduced into the chip suction hole, and even with this configuration, the chip can be reliably sucked and the suction efficiency can be improved.

  Furthermore, in the invention of claim 4, since the tip end portion of the tool body is recessed in the direction in which the tool shaft center portion is farther from the tip end of the tool than the outer peripheral portion, the center blade and the outer peripheral blade can be securely bited into the workpiece. This prevents the tool from swinging and stabilizes the chip suction efficiency. Incidentally, when the tool is shaken, the suction flow rate is not stabilized, and the stability of the chip suction efficiency is adversely affected.

1 is an overall perspective view of a machine tool equipped with a chip suction tool according to Embodiment 1 of the present invention. It is a side view of the tool. It is a cross-sectional side view showing the outer peripheral blade side of the tool. It is a cross-sectional side view showing the center blade side of the tool. It is the front view seen from the front end side of the said tool. It is the perspective view which looked at the center blade side of the said tool from the front end side. It is the perspective view which looked at the peripheral blade side of the tool from the tip side.

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

  1 to 7 are diagrams for explaining a chip suction tool according to a first embodiment of the present invention.

  In the figure, reference numeral 1 denotes a machine tool. The machine tool 1 includes a bed 2, a column 3 standing on the back of the bed 2, a spindle head 4 supported on the front surface of the column 3 so as to be movable in the vertical direction (Z-axis direction), A saddle 5 is supported on the front portion of the bed 2 so as to be movable in the front-rear direction (Y-axis direction), and a table 6 is supported on the saddle 5 so as to be movable in the left-right direction (X-axis direction). Yes.

  A spindle 7 is rotatably supported in the spindle head 4, and a drill 10 as a chip suction tool is detachably attached to a lower end portion of the spindle 7 via a tool holder 14.

  The machine tool 1 further includes an automatic tool changer 11 that automatically exchanges the drill 10 mounted on the spindle 7 and the next process tool. The automatic tool changer 11 includes a tool magazine 12 arranged on the side wall of the column 3 and a tool change arm 13 arranged between the tool magazine 12 and the main shaft 7.

  The machine tool 1 according to the present embodiment includes a chip suction device 15 that sucks chips generated when the work W is drilled by the drill 10 attached to the main shaft 7.

  The chip suction device 15 is an outline in which a chip collection box 15b containing a suction force generation source and the drill 10 are connected by a suction path and a suction pipe 15a formed in the drill 10, the tool holder 14, and the main shaft 7. It has a structure.

  The main shaft 7 is formed of a cylindrical body in which a chip discharge hole that constitutes a part of the suction path is formed in the shaft center portion, and is driven to rotate by a drive motor (not shown) built in the main shaft head 4. Is done.

  In the tool holder 14, a support hole in which the drill 10 is mounted and a chip discharge hole that constitutes a part of the suction path are formed through the shaft center portion, and the tool holder 14 is detachably mounted on the lower end portion of the main shaft 7. ing.

  The drill 10 has a drill body 8 made of a round bar, and a pair of center blades 9a and outer peripheral blades 9b that are detachably attached to the tip 8a thereof. The drill body 8 includes a front part 8b in which the tip part 8a is formed, and a holding part 8c having a diameter larger than that of the front part 8b and held by the tool holder 14. The distal end surface 8a 'of the distal end portion 8a is recessed so as to move away from the distal end of the shaft center as it goes from the outer peripheral portion 8e toward the axial center portion 8f.

  A chip suction hole 16 is formed in the drill body 8 so as to extend along the tool axis a and penetrate the rear end face 8d. The chip suction hole 16 is formed in the drill body 8 with a center suction hole 16e and an outer periphery suction hole 16f, which will be described later, formed in the tip 8a of the drill body 8, and the center and outer periphery suction holes 16e, 16f merge. Main suction hole 16c.

  The main suction hole 16c is located at the front suction hole 16a located at the axial center portion of the front portion 8b, and at the axial center portion of the holding portion 8c, and has a larger suction diameter than the front suction hole 16a. The hole 16b is communicated with the chip suction device 15.

  The front end 16d of the front suction hole 16a is located on the front part 8b side from the boundary between the front end part 8a and the front part 8b, and is at the front end angle of the drill used for forming the front suction hole 16a. It has a conical shape with a corresponding apex angle of 130 ° to 140 °.

  A pair of central blade notches 8g and outer peripheral blade notches 8h are deep in the axial direction across the tool axis a at the tip 8a, and on the outer peripheral surface (side surface) of the tip 8a. Is also formed to open. A central blade mounting portion 8i is recessed near the tool axis a of the inner wall of the central blade notch portion 8g, and an outer peripheral blade mounting portion 8j is recessed near the outer periphery of the inner wall of the outer peripheral blade notch portion 8h. It is installed.

  The central blade 9a is detachably mounted on the central blade mounting portion 8i by a bolt 9a ', and the outer peripheral blade 9b is detachably mounted on the outer peripheral blade mounting portion 8j by a bolt 9b'. The front end in the axial direction of the center blade 9a and the outer peripheral blade 9b protrudes slightly forward from the tip surface 8a 'of the tip portion 8a.

  Further, the central suction hole 16e is formed in the central blade notch portion 8g, and the outer peripheral suction hole 16f is formed in the outer peripheral blade notch portion h so as to communicate with the tip 16d of the front suction hole 16a. ing. Thus, the central suction hole 16e and the outer peripheral suction hole 16f merge with the front suction hole 16a constituting the front part of the main suction hole 16c.

  Here, the central blade notch portion 8g and the outer peripheral blade notch portion 8h are disposed in front of the central blade 9a and the outer peripheral blade 9b in the rotation direction A of the drill 10. The center blade notch 8g is for attaching the center blade 9a closer to the axial center, and therefore is larger than the outer periphery blade notch 8h for attaching the outer periphery blade 9b closer to the outer periphery.

  Further, the axis b of the outer peripheral suction hole 16f is greatly inclined to the outer peripheral side with respect to the tool axis a than the axis c of the central suction hole 16e. Therefore, the opening 16f 'of the outer peripheral suction hole 16f to the outer peripheral blade notch 8g is located radially outside the opening 16e' of the central suction hole 16e to the central blade notch 8g. Therefore, although the outer peripheral blade 9b is arranged on the outer side in the radial direction, the distance from the processing point of the outer peripheral blade 9b to the opening 16f ′ of the outer peripheral suction hole 16f is the axis b of the outer peripheral suction hole 16f. Is smaller than the case where it is set to the same degree as the axial center c of the central suction hole 16e.

  Furthermore, the outer peripheral suction hole 16f is formed to have a smaller diameter than the central suction hole 16e, so that the suction air flow rate in the outer peripheral suction hole 16f is higher than the suction flow rate in the central suction hole 16e.

  A side wall 8k is formed outside the opening 16e 'of the central suction hole 16e at the tip 8a of the tool body 8 so as to extend in the circumferential direction of the tip 8a. The side wall 8k narrows the suction path area S to the opening 16e 'surrounded by a two-dot chain line in FIG. 6 by an area (corresponding to the area of the side wall 8k) S' shaded in FIG. To work.

  Of the opening to the outside of the center blade notch 8g, the portion opened to the tip end face 8a 'side is closed by the workpiece during processing, so that the suction path to the opening 16e' is substantially provided. It will not be.

  Further, a central blade groove 17a and an outer peripheral groove 17b extending in the direction of the tool axis a are recessed in the outer surface of the tool body 8. The central blade groove 17a and the outer peripheral groove groove 17b are for introducing suction air into the central suction hole 16e and the outer peripheral suction hole 16f, respectively, and from the front part 8b of the tool body 8 to the tip part of the tip part 8a. The length is set over the entire length up to the surface 8a '. Cutouts 17c and 17d are formed at the distal ends of the central blade groove 17a and the outer peripheral blade groove 17b so that the grooves 17a and 17b communicate with the central suction hole 16e and the outer peripheral suction hole 16f. During processing, the grooves 17a and 17b and the notches 17c and 17d form an air introduction passage with the work that closes the outside.

  In this embodiment, chips generated when drilling the workpiece W with the drill 10 are sucked and collected by the chip suction device 15. In this case, a necessary amount of surrounding air is introduced as suction air from the central blade groove 17a and the outer peripheral groove groove 17b of the tool body 8 to the central suction hole 16e and the outer peripheral suction hole 16f through the notches 17c and 17d. The generated chips are collected by the suction air into the chip collection box 15b from the central suction hole 16e and the outer peripheral suction hole 16f through the main suction hole 16c.

  According to the present embodiment, the central suction hole 16e that opens near the center blade 9a and the outer peripheral suction hole 16f that opens near the outer peripheral blade 9b merge with the main suction hole 16c, and the center of the tool body 9 is A side wall 8k extending in the circumferential direction of the tool body 8 is formed outside the opening 16e ′ of the suction hole 16e.

  With this configuration, as shown in FIG. 6, the suction path area (area surrounded by a two-dot chain line in the figure) S to the opening 16e 'of the central suction hole 16e is hatched in the figure by the side wall 8k. The applied area S ′ can be reduced. Thereby, while setting the center blade notch portion 8g larger than the outer peripheral blade notch portion 8h, the flow velocity of the suction air on the center blade notch portion 8g side can be increased, and the chips can be reliably sucked. And the suction efficiency can be improved.

  In addition, since the side wall 8k is formed outside the opening 16e 'of the central suction hole 16c, chips that are likely to jump out from the processing point hit the side wall 8k and are prevented from being scattered, and the central suction hole 16c is prevented from being scattered. It becomes easy to be sucked, and suction efficiency can be improved also from this point.

  Here, it is considered that the area from the processing point of the cutting blade to the opening of the suction hole has a large suction path area, so that the flow velocity is lowered, and therefore the suction efficiency is lowered accordingly.

  In this embodiment, since the outer peripheral blade 9b is disposed on the radially outer side, the distance from the processing point of the outer peripheral blade 9b to the opening 16f 'of the outer peripheral suction hole 16f, and thus the region, is disposed on the tool axis a side. It becomes larger compared with the area | region in the made center blade 9a.

  Therefore, in this embodiment, as shown in FIGS. 3 to 5, the axial center b of the outer peripheral suction hole 16 f is inclined more than the axial center c of the central suction hole 16 e toward the outer peripheral side, thereby opening the outer peripheral suction hole 16 f. 16f 'was positioned radially outward from the opening 16e' of the central suction hole 16e. Therefore, the distance from the processing point of the outer peripheral blade 9b to the opening 16f 'of the outer peripheral suction hole 16f, and thus the region, can be suppressed from becoming larger than the region on the central blade 9a side, and the chips can be reduced to the same extent as the central blade 9a side. Suction can be performed reliably and a decrease in suction efficiency can be avoided.

  Further, since the diameter of the outer peripheral suction hole 16f is set to be smaller than that of the central suction hole 16e, the flow velocity of the suction air on the outer peripheral blade suction hole 16f side can be increased, and this configuration also allows the outer peripheral blade 9b disposed on the radially outer side. It is possible to reliably collect chips from.

  Further, a central blade groove 17a and an outer peripheral blade groove 17b extending in the direction of the tool axis a are formed on the outer surface of the tool body 8, and the grooves 17a and 17b are formed in the openings 16e 'and 16f'. Since the notches 17c and 17d to be communicated are formed, a necessary and sufficient amount of suction air can be introduced into the central suction hole 16e and the outer peripheral suction hole 16f, and chips can be reliably sucked.

  Further, when forming the chip suction hole 16, the tip 16d of the main suction hole 16c is positioned on the front part 8b side from the boundary between the tip part 8a and the front part 8b of the tool body 8, and from the tip side to the center suction hole. 16e and the outer peripheral suction hole 16f are penetrated toward the tip 16d, so that the thickness in the tool axis a direction of the portion between the central blade mounting portion 8i and the outer peripheral blade mounting portion 8j can be secured. Incidentally, if the main suction hole 16c is formed so that the tip 16d of the main suction hole 16d directly opens into the central blade notch portion 8g and the outer peripheral blade notch portion 8h, the necessary wall thickness cannot be secured.

  Furthermore, since the tip surface 8a 'of the tip 8a of the tool body 8 is set to have a shape in which the tool shaft center 8f is recessed in the direction away from the tool tip from the outer periphery 8e, the center blade 9a and the outer blade 9b are made to work. The tool can be prevented from swinging and the chip suction efficiency can be stabilized. By the way, when the tool swings, the stability of the chip suction efficiency is adversely affected.

  In the above-described embodiment, the case where the central blade groove 17a and the outer peripheral blade groove 17b penetrate the tip surface 8a 'of the tip portion 8a of the tool body 8 has been described. A notch communicating with the central suction hole 16e and the outer peripheral suction hole 16f may be formed in the vicinity of the front end of the surface 8a 'and in the vicinity of the front end thereof.

DESCRIPTION OF SYMBOLS 1 Machine tool 8a Tip part 8 Tool main body 8a 'Tip surface 8k Side wall 9a Center blade 9b Peripheral blade 10 Drill (Chip suction tool)
15 Chip suction device 16 Chip suction hole 16c Main suction hole 16e Center suction hole 16e 'Center suction hole opening 16f Peripheral suction hole 16f' Peripheral suction hole openings 17a, 17b Notch a Tool axis S Suction path area

Claims (4)

A chip suction device having a tool body having a chip suction hole that opens at the tip, a center blade mounted on the tool axis side of the tip of the tool body, and an outer blade mounted on the outer periphery. A chip suction tool mounted on a machine tool equipped with
The chip suction hole includes a central suction hole that opens near the central blade, an outer peripheral suction hole that opens near the outer peripheral blade, the central suction hole and the outer peripheral suction hole merge, and along the tool axis. A main suction hole that communicates with the chip suction device.
A chip suction tool, wherein a side wall is formed outside the opening of the central suction hole of the tool body so as to extend in the circumferential direction of the tool body and narrow the suction path area of the opening. In the chip suction tool according to claim 1,
The chip suction tool, wherein the opening of the outer peripheral suction hole is located radially outward from the opening of the central suction hole. In the chip suction tool according to claim 1 or 2,
A groove extending in the tool axis direction is recessed in the outer surface of the tool body, and a notch for communicating the groove with the opening is formed in the tip of the tool body. A chip suction tool. In the chip suction tool according to any one of claims 1 to 3,
The tool suction tool according to claim 1, wherein the tip end surface of the tool body is recessed in a direction in which a tool axis portion is farther from the tool tip than an outer peripheral portion.

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