JP2011005618A - Inside diameter working tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inside diameter working tool having superior cutting chip discharging property.SOLUTION: The inside diameter working tool comprises a cutting insert having a main cutting blade on a crossing ridge between an upper surface and a side surface, a fitting part of the cutting insert, and a holder having a cutting liquid feeding unit for feeding cutting liquid to the cutting insert. The cutting insert is arranged in plan view so that one end of the main cutting blade is projected from an outer peripheral surface of the holder, and one end of the main cutting blade is located at the same position as the other end of the main cutting blade, or on the rear end side from the other end of the main cutting blade in the direction from the front end side to the rear end side of the holder. The cutting liquid feeding unit has a feeding front end part formed inside the holder to directly feed the cutting liquid to a side face continuous to the main cutting blade.

Description

  The present invention relates to an inner diameter machining tool, and more particularly to an inner diameter drawing tool.

  Some inner diameter machining tools have a cutting fluid supply unit for supplying a cutting fluid for the purpose of improving the discharge of generated chips or cooling the cutting blade during cutting.

  For example, Patent Document 1 discloses a tool in which a coolant supply unit is provided inside a shank. In this tool, the injection port of the coolant supply unit is inclined at a predetermined angle from the center of the shank toward the tip of the cutting blade, and is arranged at a predetermined distance from the tip of the cutting blade. As a result, coolant is ejected from the tip of the cutting edge toward the end face of the machining hole, the insert is cooled, and the generated chips are unilaterally introduced into the machining hole inlet using the coolant flow that collides with the end face of the machining hole and rebounds. To the outside of the hole.

  However, in the so-called inner diameter drawing process that expands a part of the inner diameter of the hole from the back of the hole to the hole entrance, an unprocessed step may be formed between the tip of the cutting edge and the shank. In some cases, the cutting fluid may be prevented from being cooled by the cutting fluid. Further, in this case, the generated chips are forcibly discharged to the outside of the machining hole by using a coolant flow that rebounds by colliding the coolant with the machining hole end surface of the work material. Due to the coolant flow that causes the coolant to collide with the chip, the chips are pushed into the end face of the machining hole, and the chips may not be discharged well.

  In this way, if the cooling effect on the cutting edge and the chip discharge performance are impaired, the tool life of the cutting insert will be reduced, the chip will be clogged inside the hole and damage the insert and tool holder, etc. Problems can arise.

Japanese Patent Laid-Open No. 2007-075933

  The subject of this invention is providing the tool for internal diameter processing which has the outstanding chip discharge | emission property.

  An inner diameter machining tool according to the present invention includes a cutting insert having a main cutting edge at an intersecting ridge between an upper surface and a side surface, a mounting portion of the cutting insert, and a cutting fluid supply unit for supplying a cutting fluid to the cutting insert. An inner diameter machining tool, wherein the cutting insert has one end portion of the main cutting edge protruding from the outer peripheral surface of the holder and rearward from the front end side of the holder in a top view. Arranged so that one end of the main cutting edge is located at the same position as the other main cutting edge or on the rear end side of the other main cutting edge in the direction toward the end side The cutting fluid supply part is formed inside the holder, and has a supply leading end part for supplying cutting fluid directly to the side surface continuous with the main cutting edge. To do.

  In one embodiment, the mounting portion has a rising surface that is located on the rear end side of the holder of the main cutting edge and rises from the bottom surface on which the cutting insert is seated toward the rear end side of the holder. The first opening of the supply tip is formed on the rising surface.

  In one embodiment, the supply tip is substantially cylindrical, and when viewed from above, an angle formed by the central axis of the supply tip and the side surface continuous with the cutting edge is 30 ° to 60 °. It is characterized by being.

  In one embodiment, the supply tip portion is substantially cylindrical, and an angle formed by a central axis of the supply tip portion and the side surface continuous with the cutting blade in a side view is 75 ° to 105 °. It is characterized by being.

  The holder of the present invention includes a cutting insert mounting portion having a main cutting edge at an intersection ridge between the upper surface and the side surface, and a cutting fluid supply having an opening on the rear end side of the mounting portion and penetrating to the rear end portion. And the mounting portion is arranged such that one end portion of the main cutting edge of the cutting insert protrudes from the outer peripheral surface, and in the direction from the front end side to the rear end side of the holder. One end portion of the cutting blade is formed to be positioned on the rear end side compared to the other end portion of the main cutting blade, and the cutting fluid supply portion is formed inside, and It has a supply front-end | tip part which can supply cutting fluid directly with respect to the said side surface which continues to a main cutting edge.

  A manufacturing method of a workpiece according to the present invention is a manufacturing method using the above-mentioned inner diameter machining tool, the step of rotating the workpiece to bring the inner diameter machining tool closer, and the inner diameter on the surface of the workpiece The method includes a step of cutting the work material by contacting a cutting blade of the work tool, and a step of separating the inner diameter working tool from the work material.

  According to the inner diameter machining tool of the present invention, when performing the inner diameter machining, the cutting blade, particularly the main cutting edge, can be performed while being sufficiently cooled, and the generated chips are removed from the machining hole of the work material to the outside. Can be discharged well. As a result, it is possible to further reduce damage to the insert due to chips and damage due to heat, and to suppress damage to the tool holder due to chips. Moreover, it is possible to suppress the damage of the processing surface by a chip. The inner diameter machining tool of the present invention uses the flow of cutting fluid that rebounds from the flank face of the insert, particularly when performing inner diameter drawing, to force generated chips from the machining hole inlet of the work material to the outside. To exhaust. Therefore, compared with the case where the flow of the cutting fluid that rebounds from the depth of the machining hole as in the conventional case is used, the cutting fluid is less likely to push the chips into the depth of the machining hole, which is useful.

1 is an overall perspective view of an inner diameter machining tool according to an embodiment of the present invention. 2A is a plan view of the inner diameter machining tool shown in FIG. 1, FIG. 3B is a side view of the tool for machining the inner diameter as viewed from the X direction, and FIG. FIG. 3 is a partially enlarged view of FIG. It is the elements on larger scale seen from the Z direction of FIG. It is process drawing explaining the manufacturing method of the workpiece using the tool for internal diameter processing of FIG.

<Inner diameter machining tool>
Hereinafter, an embodiment of an inner diameter machining tool of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the inner diameter machining tool 1 (hereinafter abbreviated as “tool 1”) includes a cutting insert 2 (hereinafter abbreviated as “insert 2”) and a holder 3.

  The insert 2 has a polygonal plate shape, and a cutting edge 21 is formed at the intersection ridge between the upper surface and the side surface. The cutting edge 21 further has a main cutting edge 211 and a sub cutting edge 212, and a corner portion 22 is formed between the main cutting edge 211 and the sub cutting edge 212. The main cutting edge plays a main role in chip generation in the cutting action. The secondary cutting edge refers to a cutting edge other than the main cutting edge. As shown in FIGS. 1 and 2, the insert 2 according to the present embodiment has a rhombus shape on the top surface of the insert 1, and an acute corner portion 22 is formed between the main cutting edge 211 and the sub cutting edge 212. ing. The secondary cutting edge 212 can also be used as a main cutting edge. In this case, the main cutting edge 211 is used as a secondary cutting edge.

  As described above, the cutting blade 21 is formed at the intersection ridge between the upper surface and the side surface. In this case, the side surface functions as a flank 23 and the upper surface functions as a rake surface 24. In the present specification, a side surface continuing to the main cutting edge 211 is referred to as a main flank 231, and a side surface continuing to the sub cutting edge 212 is referred to as a sub flank 232.

  As shown in FIGS. 1 and 2, the holder 3 has a substantially columnar shape, and includes a cutting blade portion 31 located at the tip and a shank portion 32 located behind the cutting blade portion 31. A mounting portion 4 is formed on the cutting blade portion 31, and a cutting fluid supply portion 5 is formed on the rear end side of the mounting portion 4. The shank portion 32 is a portion that is gripped by an external device during cutting.

  The mounting portion 4 formed on the cutting blade portion 31 is a portion to which the insert 2 is mounted and fixed, and has a seat surface 41 that contacts the lower surface of the insert 2 and a side wall surface 42 that contacts the side surface of the insert 2. is doing. In the present embodiment, as shown in FIGS. 1 and 2, the lower surface and the two side surfaces of the insert 2 are in contact with the seat surface 41 and the side wall surface 42, respectively. The insert 2 is mounted and fixed by inserting a mounting screw into the.

For example, as shown in FIG. 3, the insert 2 attached to the attachment portion 4 is disposed so that the end t _{1 of one} main cutting blade 211 protrudes from the outer peripheral surface of the holder 3. . That is, the insert 2 is disposed such that the corner portion 22 formed by the main cutting edge 211 and the sub cutting edge 212 protrudes from the outer peripheral surface of the holder 3. In addition, in the top view, the one main cutting edge end t ₁ is the other main cutting edge in the direction from the front end side to the rear end side of the holder 3 so that the inner diameter can be reduced. It is arranged so as to be at the same position as the end t ₂ or at the rear end side. For example, when performing the pulling process in the inner diameter drawing process, the main cutting edge part t ₁ is arranged so as to be located on the rear end side with respect to the main cutting edge part t ₂ .

  The mounting portion 4 is recessed in the mounting portion 4 so as not to come into contact with the corner portion 22 from the viewpoint of suppressing a loss of the main cutting edge 211 (corner portion 22) that is not substantially used when the insert 2 is mounted. 43 is formed.

In the present embodiment, a concave surface 6 is further formed on the peripheral edge of the mounting portion 4. The concave surface 6 functions as a chip pocket serving as a discharge path for discharging chips. In the present embodiment, the concave surface 6 rises toward the rear end side of the holder 3, and an edge between the concave surface 6 and the outer peripheral surface of the holder 3 is an outer periphery on the main cutting edge end t ₁ side in a top view. It forms so that it may go to the rear end side of the holder 3 as it goes to the surface.

  The cutting fluid supply unit 5 formed in the holder 3 serves to supply cutting fluid such as coolant to the cutting blade 21. The cutting fluid supply unit 5 is formed inside the shank portion 32, and includes a first opening 51 formed in the cutting blade portion 31 and a second opening formed in the rear end portion of the shank portion 32. 52 is formed. The shape of the cutting fluid supply unit 5 is not particularly limited. For example, the cross-sectional shape may be either a circle or a polygon such as a quadrangle. Specifically, a cylindrical shape is preferable.

  The cutting fluid supply unit 5 has a supply tip 53 that directly supplies the cutting fluid to the side surface (main flank 231) continuous with the main cutting edge 211. That is, the cutting fluid supply part 5 includes the supply tip part 53, a supply body part connected to the supply tip part 53 and formed along the central axis L of the holder 3 and inserted through the second opening 52. It is composed of This supply front-end | tip part 53 is a part which determines the supply direction of cutting fluid, and is connected to the 1st opening part 51 corresponded to an injection port. The supply distal end portion 53 may be linear when viewed from above, or may have a tapered shape that becomes thinner toward the first opening 51.

  The first opening 51 corresponding to the injection port of the supply leading end 53 is formed on a surface facing the main flank 231 on the holder rear end side with respect to the main cutting edge 211. Examples of such a surface include a side wall surface 42 in the mounting portion 4 or a side pocket (a chip processing portion 7 described later). The first opening 51 is preferably provided in the mounting portion 4, for example. This makes it possible to more reliably supply the cutting fluid from the cutting supply unit 5 to the side surface (main flank 231) that is continuous with the main cutting edge 211. As a result, the cutting fluid rebounds mainly from the main flank 231 and the chips are discharged to the outside of the machining hole by the flow. Therefore, the flow of cutting fluid toward the end surface of the machining hole is extremely small, compared to the conventional case where chips are discharged outside the machining hole using the flow of cutting fluid that bounces off the machining hole end surface of the work material. It is preferable that chips are not pushed into the end face of the machining hole due to the flow of the cutting fluid. In this embodiment, the 1st opening part 51 is formed in the mounting part 4 in the standing surface 44 which stands | starts up toward the rear end side of a holder from the bottom face (seat surface 41) where a cutting insert seats. The rising surface 44 is formed continuously with the side wall surface 42 and is formed at a predetermined distance in the vicinity of the main flank 231 so that the cutting fluid is directly supplied to the main flank 231. Yes. That is, a space is formed between the first opening and the main flank 231, and the distance of this space is appropriately set according to the supply speed of the cutting fluid from the injection port. Thus, by forming the first opening 51 in the rising surface 44, the cutting fluid can be directly and efficiently supplied to the main flank 231.

  The cutting fluid supply unit 5 also has a predetermined inclination angle with respect to the main flank 231. Specifically, the main flank 231 of the main cutting edge 211 and the axis of the supply tip 53 need only form a desired angle as described later.

  The inclination angle of the cutting fluid supply part with respect to the side surface continuous with the main cutting edge 211 is represented by an angle β formed by the axis of the supply tip 53 and the side surface continuous with the main cutting edge 211. When the inclination angle β is too small, it may be difficult to discharge generated chips to the outside when machining the inner diameter of the hole formed in the work material. On the other hand, when the size is too large, for example, the unprocessed portion of the work material formed between the main cutting edge 211 and the cutting fluid supply unit 5 during inner diameter machining impedes the supply of the cutting fluid to the main cutting blade 211. May occur.

Inclination angle beta is specifically preferably set such that the angle beta ₁ in the top view shown in FIG. 3 is 30 ° to 60 °, is beta ₂ in a side view as shown in FIG. 4 It is preferable that the angle is set to 75 ° to 105 °, preferably 80 to 90 °, more preferably 85 to 88 °. With such a configuration, the cutting fluid can be efficiently supplied to the main cutting edge 211 of the insert 2, and a sufficient cooling effect is imparted to the main cutting edge 211, and chips are processed. Therefore, it is possible to discharge more reliably to the outside of the hole of the work material. For example, when the inclination angle beta ₁ is less than 30 ° may cooling effect of the main cutting edge by the cutting fluid becomes insufficient. On the other hand, if the inclination angle beta ₁ exceeds 60 °, in particular an inner diameter of evacuation process, there is a case where supply of the cutting fluid is inhibited by the workpiece. In the present embodiment, the cutting fluid supply unit 5 is set so that the inclination angle β1 shown in FIG. 3 is 45 ° and the inclination angle β2 shown in FIG. 4 is 88 °. In the present embodiment, the position of the first opening 51 is located between the upper surface and the lower surface of the insert 2 in a side view.

  In the holder 3, a chip processing portion 7 is formed on the rear end side of the main flank 231 along the rear end side of the holder from the holder outer peripheral surface toward the holder axis L. By providing such a chip processing unit 7, chips can be discharged more smoothly toward the outside of the processing hole without retaining chips between the holder and the work material.

<Manufacturing method of workpiece>
An embodiment of a method for producing a workpiece according to the present invention using the inner diameter machining tool 1 will be described in detail with reference to FIG.

The manufacturing method of the workpiece according to this embodiment includes the following steps (I) to (IV):
(I) Step of rotating work material (II) As shown in FIG. 5A, the inner diameter machining tool 1 is moved in the direction of arrow A to bring the cutting edge 21 closer to the work material (further, (III) As shown in FIGS. 5B and 5C, the inner diameter machining tool 1 is moved in the directions of arrows B and C to cut the cutting edge. A step of cutting the work material by bringing 21 into contact with the surface of the work material (IV) A step of moving the inner diameter machining tool 1 to separate the cutting blade 21 from the work material.

  Since the method of manufacturing a workpiece according to the present embodiment is processed using the tool 1 having excellent chip dischargeability described above, chips are covered during cutting, particularly during inner diameter drawing. It can suppress staying in the processing hole formed in the cutting material. Therefore, it is possible to suppress chips from damaging the processing wall surface of the work material. As a result, cutting with high processing accuracy can be realized.

  Moreover, when pulling out the tool 1 from the machining hole, it is possible to prevent chips from being entangled with the cutting blade 21 and the vicinity thereof. Therefore, when performing a new process, the process of removing the chips entangled with the cutting blade 21 can be reduced, and the working efficiency can be improved.

  As mentioned above, although several embodiment concerning this invention was illustrated, this invention is not limited to embodiment mentioned above, It cannot be overemphasized that it can be made arbitrary, unless it deviates from the summary of this invention. .

DESCRIPTION OF SYMBOLS 1 Tool for internal diameter processing 2 Cutting insert 21 Cutting blade 211 Main cutting blade 212 Sub cutting blade 22 Corner part 3 Holder 4 Mounting part 41 Seat surface 42 Side wall surface 43 Recessed part 44 Standing surface 5 Cutting fluid supply part 51 1st opening part 52 1st Two opening parts 53 Supply front-end | tip part 6 Concave surface 7 Chip processing part L The axis of the shank part 3 of a holder

Claims (6)

A cutting insert having a main cutting edge at the intersection ridge of the upper surface and the side surface;
A holder having a mounting portion of the cutting insert and a cutting fluid supply unit for supplying a cutting fluid to the cutting insert;
An inner diameter machining tool comprising:
The cutting insert has one end of the main cutting edge in a direction in which one end of the main cutting edge protrudes from the outer peripheral surface of the holder and moves from the front end side to the rear end side of the holder in a top view. The part is arranged so as to be located at the same position as the other main cutting edge end or on the rear end side from the other main cutting edge end,
The cutting fluid supply part is formed inside the holder, and has a supply tip part for supplying cutting fluid directly to the side surface continuous with the main cutting edge. Tools. The mounting portion is located on the rear end side of the holder of the main cutting edge, and has a rising surface that rises from the bottom surface on which the cutting insert is seated toward the rear end side of the holder,
The inner diameter machining tool according to claim 1, wherein a first opening of the supply tip is formed on the rising surface.   The supply tip portion has a substantially cylindrical shape, and an angle formed by a central axis of the supply tip portion and the side surface continuous with the cutting edge in a top view is 30 ° to 60 °. An inner diameter machining tool according to claim 1 or 2.   The supply tip portion has a substantially cylindrical shape, and an angle formed by a central axis of the supply tip portion and the side surface continuous with the main cutting edge in a side view is 75 ° to 105 °. The inner diameter processing tool according to any one of claims 1 to 3. A mounting portion of a cutting insert having a main cutting edge at the intersection ridge of the upper surface and the side surface;
A cutting fluid supply unit for supplying a cutting fluid to the cutting insert;
A holder comprising:
In the mounting portion, one end of the main cutting edge of the cutting insert protrudes from the outer peripheral surface, and the one end of the main cutting edge is in the direction from the front end side to the rear end side of the holder. It is formed so as to be located at the same position as the other main cutting edge end or the rear end side of the other main cutting edge,
The holder is characterized in that the cutting fluid supply unit has a supply tip portion that is formed inside and that supplies cutting fluid directly to the side surface continuous with the main cutting edge. A method for producing a workpiece using the inner diameter machining tool according to any one of claims 1 to 4,
Rotating the work material to bring the inner diameter machining tool closer;
Cutting the work material by bringing the cutting edge of the inner diameter machining tool into contact with the surface of the work material; and
Separating the inner diameter machining tool from the work material;
A method for manufacturing a work piece, comprising:

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