JP2014240097A - Cutting edge replacement type cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance operability of a clamp mechanism, while securing a function of firmly clamping a cutting insert even in an application where clamp-unclamp operations from the upper surface side of the cutting insert are restricted, in a cutting tool in which the cutting insert is mounted on a tool body.SOLUTION: The clamp mechanism for fixing the cutting insert to the tool body, comprises a clamp member having a head part on one end of a shaft part and a rotary member for linearly moving the clamp member, and the rotary member comprises a rotary member capable of rotary operation from the side surface side of the tool body and a gear part for converting rotation of the rotary member into linear motion and transmitting it to the clamp member, and the clamp member is propelled toward the bottom surface side of the tool body by the rotary member, and the cutting insert is pressed and fixed by the head part.

Description

  The present invention relates to a cutting edge-exchangeable cutting tool that improves the operability of clamping and unclamping when the cutting insert is fixed to a tool body and mounted on a comb-type tool post.

  The cutting insert is fixed in the cutting edge exchanging tool by a method of fixing with a clamp screw.

  In addition to the screwing method, a pin tilting method in which a pin is inserted into the center mounting hole of the cutting insert, the pin is tilted with an integral rocking lever, and pressing pressure against the seat side surface is applied to the cutting insert (see Patent Document 1 below) ) Etc. are also used.

Japanese Patent Laid-Open No. 10-328910

  A screw-type clamping mechanism using a clamp screw can strongly press the cutting insert against the seat bottom surface. In addition, by pressing the center of the clamp screw with respect to the center of the mounting hole of the cutting insert, it is possible to generate a pressing force on the seat side surface and to easily adjust the distribution of the pressing force (clamping force) in two directions. .

  However, the comb-toothed tool post described above, where multiple cutting tools are mounted in parallel, has a narrow setting interval and ensures a sufficient space for operating the clamp screw, especially when the cutting tools are mounted sideways. Difficult to do.

  Therefore, the operability of the clamp screw is poor, and it is difficult to expect efficient attachment / detachment of the cutting insert.

  In addition, the pin tilting method can set the clamp screw that swings the swing lever to a position that does not hinder the operation, but this method has a low degree of freedom in the distribution of the clamping force and the clamping force is weak. .

  This invention makes it possible to improve the operability of the clamping mechanism while ensuring the function of firmly clamping the cutting insert, even in applications where the operation of clamping and unclamping from the upper surface side of the cutting insert of the clamping mechanism is restricted. It is an issue.

  In order to solve the above-described problems, the present invention provides the following cutting edge exchangeable cutting tool.

A cutting tool comprising a tool body, a cutting insert having a mounting hole, and a clamp mechanism for fixing the cutting insert to the tool body,
In the cutting tool, the clamp mechanism includes a clamp member having a head at one end of the shaft portion, and a rotating member that linearly moves the clamp member,
The rotating member has a cylindrical portion incorporated in the tool body, and a gear portion that transmits the rotational motion of the rotating member to the clamp member,
By rotating the rotating member, the clamp member is propelled toward the bottom surface side of the tool main body, and the cutting insert is pressed and fixed by the head.

  Since the cutting edge replaceable cutting tool of the present invention is provided with the clamp mechanism, the operability of the clamp mechanism is ensured while ensuring the function of firmly clamping the cutting insert even in applications where the operation from the upper surface side of the cutting insert is restricted. Can be increased.

It is a top view which shows an example of the blade-tip-exchange-type cutting tool of this invention. It is a side view of the blade-tip-exchange-type cutting tool of FIG. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing for exchange operation | movement description of a cutting insert. It is a perspective view of the clamp mechanism component used for the blade-tip-exchange-type cutting tool of FIG. It is a top view of a clamp mechanism component same as the above. It is a side view of a clamp mechanism component same as the above. It is a perspective view of the cutting insert used for the blade-tip-exchange-type cutting tool of FIG. It is a top view of the cutting insert same as the above. It is sectional drawing along the XX line of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a blade-tip-exchangeable cutting tool according to the present invention will be described with reference to FIGS.

  The cutting edge replacement type cutting tool 1 shown in FIGS. 1 to 5 is a cutting tool. This cutting edge-exchangeable cutting tool 1 includes a tool body (bite holder) 2, a cutting insert 10 having an attachment hole 11 and a cutting edge 12, and a cutting insert on a support seat 3 provided on the top surface of the tool body 2 on the tip side. The clamp mechanism 20 which fixes 10 is provided.

  The tool main body 2 has a vertical hole 4 (see FIGS. 3 to 5) extending from the support seat 3 to the bottom surface of the tool main body, and a horizontal hole 5 (FIG. 3) cut through the tool main body 2 in the middle of the vertical hole 4. To FIG. 5). The illustrated horizontal hole 5 is a combination of the screw hole shown in FIG. 4, 5 a and a round hole 5 b having a larger diameter than the screw hole.

  The support seat 3 of the tool body 2 includes a shim plate 6 (see FIGS. 2, 3, and 5) interposed between the tool body and the seat base 3 a, and the shim plate 6 Is only a preferred element.

  As shown in FIGS. 9 to 11, the mounting hole 11 provided in the cutting insert 10 expands a diameter of a circular hole 11 a with a seat having a tapered seat 11 b and a part of the circular hole 11 a with the seat. It is a hole having a shape in which holes 11c that are non-circular in plan view (in the drawing, rectangular) are stacked.

  The clamp mechanism 20 is shown in detail in FIGS. 6 to 8, that is, a clamp member 21 having a head portion 21b having a diameter larger than that of the shaft portion at one end of the shaft portion 21a, and the clamp member 21 linearly. A combination of the rotating members 22 to be moved is provided.

  A shaft portion 21a of the illustrated clamp member 21 is formed by cutting a rack 24a into a cylindrical shape and further forming a concave stealing portion 21c near the other end. The shaft portion 21a is slidably inserted into the vertical hole 4 having a circular cross section.

  Further, the head portion 21b of the clamp member 21 has a shape similar to that of the non-circular hole 11c in plan view. The head 21b has a size that can pass through the non-circular hole 11c. When the head 21b is rotated relative to the non-circular hole 11c after passing through the non-circular hole 11c, a portion protruding from the outer periphery of the shaft portion 21a is seated. It moves on 11b and engages with the seat 11b.

  By combining the clamp member 21 having such a head shape and the cutting insert 10 having the mounting hole 11 having the above-described shape, the cutting insert 10 can be attached and detached by a so-called bayonet fitting method. The insert 10 can be attached and detached without removing the clamp member 21.

  The rotating member 22 includes a cylindrical portion 22 a that is incorporated in the lateral hole 5 of the tool body 2 and a gear portion 22 b that transmits the rotation of the rotating member to the clamp member 21.

  As shown in FIGS. 6 to 8, the illustrated rotating member 22 has a screw 23 formed on the cylindrical portion 22 a at the tip, and an axially long pinion 24 b formed on the screw 23 and the gear portion 22 b. This is a shaft-shaped member. This rotating member 22 is assembled into the lateral hole 5 from the open end of the round hole 5b with respect to the side surface of the tool body 2, and the pinion 24b is disposed inside the round hole 5b and meshed with the rack 24a on the outer periphery of the shaft portion of the clamp member, The screw 23 is screwed into the screw hole 5a.

  The rotating member 22 exposes an operation part (not shown) on the side of the tool body 2 where the round hole 5b is opened or on the opposite side, and a tool such as a wrench is engaged with the operation part and rotated from the outside. You may do it.

  The pinion 24b is a gear having a size that generates play (gap) between the pinion portion 21c and the pinion portion 21c.

  Reference numeral 24 denotes a gear portion that transmits the rotational motion of the rotary member 22 to the clamp member 21. The gear portion 24 includes the rack 24a described above and a pinion 24b meshed with the rack.

  The exemplary blade-tip-exchangeable cutting tool configured as described above rotates the rotating member 22 in the unclamping direction, and moves the clamping member 21 upward from the position of FIG. 3 until the pinion 24b enters the stealing portion 21c.

  Thereby, the clamping member 21 can be tilted as shown in FIG. 5 by the play generated between the pinion 24b and the stealing portion 21c, and the cutting insert 10 can be rotated at a position that does not interfere with the seat side surface 3b of the support seat. The cutting insert 10 can be removed by releasing the bayonet fitting with the clamp member 21 by rotation.

  Further, a new cutting insert 10 is set in the reverse procedure to the above, and the clamping member 21 is pulled into the vertical hole 4 by the rotation operation of the rotating member 22 in the clamping direction, and the cutting insert 10 is inserted by the head 21b of the clamping member. It can be pressed and pressed against the support seat 3.

  Since this structure uses a rack and pinion, the clamp member 21 can be pulled in with an amplified force, and can be fixed more firmly than a general screwing method using a clamp screw.

  The cutting insert 10 is pressed against the support seat 3 by biasing the center of the vertical hole 4 from the center of the mounting hole 11 toward the seat side surface 3b, so that the head 21b of the clamp member against the seat 11 of the seated circular hole is placed. It is possible to generate a rightward component force in FIG. 1 at the contact portion and press it against the seat side surface 3b simultaneously with pressing against the seat bottom surface 3a.

  Moreover, since the operation part of the rotating member 22 is located on the side surface of the tool body, it is possible to perform an operation without any trouble even in applications where clamping and unclamping operations from the upper surface side of the cutting insert are restricted, and the operability of the clamping mechanism is improved. .

  In addition, the clamp member 21 is prevented from coming out of the vertical hole 4 during unclamping by the engagement of the rack and pinion, which also helps improve the operability.

  The rotating member 22 may be one without the screw 23, but the one having the screw 23 is less likely to loosen the clamp due to the reverse rotation of the screw 23. Those without the screw 23 are preferably provided with a mechanism for preventing reverse rotation of the rotating member 22 (a mechanism capable of releasing the reverse rotation prevention).

  It is preferable that the one having the screw 23 has the pinion 24b as a long gear in the axial direction so that the engagement with the rack 24a is maintained even if the screw 23 advances and retreats.

  The gear portion 24 is not limited to a combination of the illustrated rack and pinion. The thing which meshed a worm and a wheel etc. can also be considered.

  The gear portion composed of the worm and the wheel is provided with a worm on the shaft portion of the clamp member 21 and a wheel on the rotating member 22. In this structure, when the worm configured in a cylindrical shape is attached to the outer periphery of the shaft portion of the clamp member 21 so as to be rotatable and not movable in the axial direction, the head of the clamp member 21 rotates during clamping and unclamping by the clamp mechanism. Can be prevented.

  Although the illustrated cutting tool is a turning tool, the application target of the present invention is not limited to the cutting tool. Even when applied to a rotary cutting tool such as a milling cutter, the desired effect is exhibited.

DESCRIPTION OF SYMBOLS 1 Blade-tip-exchange-type cutting tool 2 Tool body 3 Support seat 3a Seat bottom surface 3b Seat side surface 4 Vertical hole 5 Horizontal hole 5a Screw hole 5b Round hole 6 Shim plate 10 Cutting insert 11 Mounting hole 11a Seated circular hole 11b Seat 11c Non-circular hole 12 Cutting blade 20 Clamp mechanism 21 Clamp member 21a Shaft portion 21b Head portion 21c Stealing portion 22 Rotating member 22a Cylindrical portion 22b Gear portion 23 Screw 24 Gear portion 24a Rack 24b Pinion

Claims (4)

A cutting tool comprising a tool body, a cutting insert having a mounting hole, and a clamp mechanism for fixing the cutting insert to the tool body,
The cutting tool, the clamp mechanism includes a clamp member having a head at one end of the shaft portion, and a rotating member that linearly moves the clamp member,
The rotating member has a rotating member that can be rotated from the side of the tool body incorporated in the tool body, and a gear portion that converts the rotation of the rotating member into a linear motion and transmits the linear motion to the clamp member.
A blade-tip-exchangeable cutting tool configured to propel the clamp member toward the bottom surface side of the tool body by rotating the rotating member and press and fix the cutting insert with the head.   The gear portion is composed of a rack geared on the outer periphery of the shaft portion of the clamp member and a pinion provided on the rotating member and meshed with the rack, and the rotating member has a screw to be screwed into the tool body. The blade tip replaceable cutting tool according to claim 1, wherein the screw can be rotated from the side of the tool body.   The cutting edge exchangeable cutting tool according to claim 2, wherein a concave stealing portion is formed near the other end of the shaft portion of the clamp member so as to create a gap that becomes playable with the pinion.   The cutting insert has a mounting hole having a shape in which a seated circular hole and a non-circular hole having a rectangular shape in plan view for expanding a part of the seated circular hole are overlapped, and the head of the clamp member is seen in plan view. The shape is similar to the non-circular hole of the mounting hole and has a size capable of passing through a square hole, and after passing through the non-circular hole, a portion protruding to the outer periphery of the shaft portion by relative rotation with respect to the non-circular hole The cutting edge exchangeable cutting tool according to any one of claims 1 to 3, wherein the cutting tool is configured to move onto a seat of a circular hole with a seat and engage with the seat.

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