JP2005230956A - Tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems wherein an accumulated part of liquefied mist is formed inside a holder by insertion depth when mounting a cutting tool to a holder and there is no structure for close contact with a cutter side end face when adjusting the projection of the cutting tool. <P>SOLUTION: This tool holder has a first cutting fluid supply passage member screw-mounted to an axis part from the spindle side mounting shank side of a tool holder body, and a second cutting fluid supply passage member screwed into a bottom axis part of a cutting tool mounting hole of the tool holder so that a small diameter shaft at the tip part is slidably fitted into a rear end hole of the first cutting fluid supply passage member. The second cutting fluid supply passage member is constituted to be axially adjustable from the spindle side mounting shank side of the tool holder body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tool holder that is attached to a rotary spindle hole of a machine tool, and supplies a cutting fluid in a mist shape to the cutting portion of a tool from within the spindle to perform end milling and the like.

  Conventionally, in such milling processing, such a tool holder has cooled and lubricated the processing tool by injecting a cutting fluid from the tip of the cutting tool to the processing point of the cutting tool from the outside during processing. It was. Recently, liquid or mist-like cutting agent is supplied into the spindle of the machine tool, and is supplied directly to the processing point through the opening provided in the cutting tool. What has made it possible to effectively discharge has been announced.

  Furthermore, recently, shrink-fitting tool holders have been frequently used. This shrink-fitting type tool holder has an advantage that the dynamic balance when holding the tool is good, and therefore high-speed machining is possible.

However, conventionally, in such a tool holder, in order to perform heating and cooling in order to mount the cutting tool to the holder main body side, the cutting tool is internally supplied to the holder main body, and then the cutting agent internal supply passage member is provided therein. It is not suitable for trying to adjust the mounting state between cutting tools by mounting the tool, so it must be heated before positioning by shrink fitting and the tool must be mounted, Heating the holder side for too long will affect the built-in components. For example, when a seal ring is installed inside, there is a risk of deformation, melting, etc. There was also a point. Further, when the seal is not perfect, a mist-like fluid is liquefied and collected in the middle of the passage, and there is a possibility that the cutting agent does not arrive in a mist-like manner to the processing point.

Japanese Patent No. 3456628 JP-T 8-502212 Publication

  The problem to be solved is that when the cutting tool is mounted on the holder, the liquefied mist accumulates inside the holder depending on the insertion depth. In addition, when adjusting the cutting tool protrusion, there was no structure to be in close contact with the blade side end face.

  The present invention includes a first cutting agent supply passage member screwed and attached to the axial center portion from the main shaft side mounting shank side of the tool holder main body, and a bottom axial center portion of the cutting tool mounting hole of the outer tool holder, A second cutting agent supply passage having a small-diameter shaft at a tip thereof slidably fitted into a rear end hole of the first cutting agent supply passage member. The main feature is that the member is configured to be adjustable in the axial direction from the main shaft side mounting shank side of the tool holder body.

  In the tool holder of the present invention, a sealing operation between a plurality of cutting agent supply passage members built in a holder main body portion having a shank portion attached to a spindle end hole of a machine tool and the attached cutting tool is performed by cutting. Since it can be reliably performed even after the tool is mounted, there is an advantage that the mist-like cutting agent that has flowed into the tool holder can be reliably sent to the cutting point and the liquefied mist does not accumulate inside the holder.

  The present invention will be described based on the illustrated embodiment.

  FIG. 1 is a front partial sectional view showing a tool holder which is an embodiment of the apparatus of the present invention. The tool holder of the present invention is formed on one end with a shank 11 for attachment to a machine tool S at one end. A first cutting agent supply having a holder body 10 having a conical cylindrical tool gripping portion 12 and a head portion 21 screwed into a screw hole 14 formed in the bottom of the inner hole portion 13 on the shank 11 side of the holder body 10. Second cutting agent supply having a passage member 20 and a head portion 31 screwed into a screw hole 16 formed in the bottom of the inner hole portion 15 on the tool gripping portion 12 side opposite to the shank 11 side of the holder body 10 It comprises a passage member 30. In the figure, S denotes a machine tool spindle, and T denotes a cutting tool such as an end mill.

  Further, details of the passage members 20 and 30 will be described. First, the first cutting agent supply passage member 20 has a shaft portion 22 extending in the longitudinal direction following the head portion 21, a through-hole 23 formed in the center portion, one end of the through-hole 23, and a spanner on the shaft portion 22 side. A bottomed hole 25 that is larger than the through hole 23 is formed on the opposite side of the head hole 21, and a large diameter step 26 is formed on this end face, and a seal ring 40 is fitted therein. ing.

  On the other hand, the second cutting agent supply passage member 30 also has a shaft portion 32 extending in the longitudinal direction following the head portion 31, a through-hole 33 formed in the center portion, one end of the through-hole 33, and the shaft portion 32 side. A spanner hole 34 is formed. Further, an annular ring-shaped groove 35 is formed on this end face, and a seal ring 50 is fitted therein. In order to prevent the fitted seal ring 50 from coming off easily, the seal ring 50 is attached to a groove 35 formed in a shape having a wide back side and a narrow end surface side. As shown in the drawing, the shaft portion 32 is fitted into the bottomed hole 25 of the first cutting agent supply passage member 20.

The cutting tool T is attached to the tool holding portion 12 side inner hole portion 15 of the tool holder body 10 configured as described above. In the embodiment of the present invention, the cutting tool T is attached by a shrink fitting method. Therefore, the diameter of the inner hole is usually slightly smaller than the shank diameter of the cutting tool to be inserted. First, the outer diameter of the tool holder is reduced by, for example, induction heating type shrink fitting. Heated. When the inner hole diameter expands and becomes larger than the cutting tool shank diameter, the cutting tool is inserted. As illustrated, the cutting tool is inserted until the rear end of the cutting tool comes into contact with the seal ring 50 attached to the end face of the second cutting agent supply passage member 30. Then, this tool holding part is then cooled by blowing air or the like.

As a result, the cutting tool is mounted on the tool holder. Thereafter, after sufficiently cooled, a wrench (not shown) is passed through the through hole 23 of the first cutting agent supply passage member 20 from the left side in the drawing to the wrench hole 34 of the second cutting agent supply passage member 30. It is possible to engage and adjust the end face seal with the cutting tool. (Not shown)

  In the embodiment described above, the sealing state can be adjusted after the cutting agent supply passage member formed inside the tool holder is mounted and fixed to the cutting tool. Thereby, the mist-like cutting agent supplied in the spindle of the machine tool can smoothly reach the cutting point of the cutting edge, and cooling of the processing point and discharge of chips can be achieved reliably.

  In the embodiment, an example in which a cutting tool such as an end mill is mounted by shrink fitting has been shown. However, the present invention can be similarly applied to a general holding type tool holder that has been conventionally used.

The front fragmentary sectional view of the tool holder by the example of the present invention. (Example)

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Holder main body 11 Shank 12 Tool holding part 13 Shank 11 side inner hole part 14, 16 Screw hole 15 Tool holding part 12 side inner hole part

20 First cutting agent supply passage member

30 Second cutting agent supply passage member

21, 31 head
S spindle
T cutting tool

Claims (2)

  The first cutting agent supply passage member screwed and attached to the shaft center portion from the main shaft side mounting shank side of the tool holder main body and the bottom shaft center portion of the cutting tool mounting hole of the outer tool holder are A second cutting agent supply passage member having a small-diameter shaft slidably fitted into a rear end hole of the first cutting agent supply passage member; A tool holder configured to be adjustable in an axial direction from a main shaft side mounting shank side of a main body. 2. The tool holder according to claim 1, wherein the cutting tool is mounted by a shrink fitting method.