JP2005254413A - Tool ejecting length setting device for tool holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device having good workability, which does not require to be removed after installation when setting an ejecting length of a cutting tool. <P>SOLUTION: One pressing rod 64a which moves in parallel of an adjusting means provided at a lower portion of a base stand 10 is inserted from a rear end of a tool holder H installed on a tool holder receiving stand 40. The other pressing rod 64b is inserted from a bottom portion of a setting spindle 50 into the inside thereof. The predetermined ejecting length S set by a master gauge in advance is moved to a gauge plate lower surface of a measuring support shaft, and the tip end of the cutting tool inserted into the setting spindle actuates the adjusting means till abutting on the gauge plate lower surface to vertically move both pressing rods 64a, 64b. The predetermined ejecting length S is set by moving a tool rear end position in the tool holder H to a tool rear end position provided on the setting spindle side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for setting a protrusion length in advance when a cutting tool is mounted on a shrink-fit type tool holder with a predetermined protrusion length.

  Conventionally, various types of tool protrusion length setting devices for such tool holders have been used and are used effectively. However, recently, a shrink-fit type tool holder has been widely used as a structure of the tool holder. 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, with this type of tool holder, when the cutting tool is mounted, the diameter of the insertion hole is formed slightly smaller than the outer diameter of the cutting tool at room temperature. The length could not be adjusted at the time of insertion.

  In other words, this shrink-fit tool holder is first heated from the outer peripheral side of the insertion hole portion of the tool holder, and when the insertion hole is widened by thermal expansion, the cutting tool is inserted, and then cooled, The outer shape of the cutting tool is firmly held by the contraction action.

Therefore, in such a tool holder, since heating and cooling are performed in order to mount the cutting tool to the holder body side, it is not possible to set the protruding length of the tool after the cutting tool is once mounted on the holder body. It was possible.

JP 2001-105283 A

  Therefore, recently, a tool position setting device as shown in Patent Document 1 has been proposed and used. However, in this apparatus, the cutting tool position is preset at a predetermined position using a preset ring, inserted in the insertion hole of the tool holder that is heated and expanded in that state, and the cutting tool is cooled by cooling the holder side in that state. After fixing, the preset ring is removed and then used. For this reason, when setting the protrusion length of the cutting tool, it is necessary to provide a part that is integrally attached to the cutting tool, such as a preset ring, and it is necessary to remove the part after attachment, resulting in poor workability. Therefore, there has been a demand for an apparatus that allows easy setting work without using such a ring. Further, when the length protruding from the holder of the tool is short, the preset ring is positioned at the cutting edge portion, and there is a drawback that accurate positioning is difficult.

  The present invention has a master gauge rod, a set spindle, and a tool holder receiving member, which are arranged and fixed at a predetermined interval with respect to a measuring spindle that is planted and arranged at a substantially central portion of the upper surface of the base, A protrusion length adjusting means is provided at the lower part of the base on which the set spindle and the tool holder receiving member are arranged, and this protrusion length adjusting means is the rear end of the tool holder attached to the tool holder receiving member. A first push rod that is inserted from the bottom and presses the rear end of the cutting tool, and a second push rod that moves in parallel with the same length as the first push rod is inserted into the set spindle from the bottom thereof. The tip position indicating the predetermined protruding length set in advance by the master gauge is moved to the lower surface position of the gauge plate that is mounted on the measuring spindle so as to be horizontally rotatable, and inserted into the setting spindle. Cutting The protruding length adjusting means is operated until the tip of the tool comes into contact with the lower surface of the gauge plate to move the push rod up and down, and the tool rear end position in the tool holder is moved away from the tool holder. It is characterized in that it is set by moving to the rear end position of the tool provided on the set spindle side.

  Since the tool protrusion setting device for the tool holder of the present invention is configured as described above, the protrusion length can be extended to the set spindle without using a preset ring as in the prior art by using it for a shrink-fit tool holder. Insert the cutting tool to be adjusted and attached, operate the protrusion length adjusting means to the predetermined position set with the master gauge rod, then remove this cutting tool from the set spindle and prepare it by heating in advance When inserted into the tool holder, the tip of the internal push rod is positioned so that it will be in the specified protruding length position, and if it is cooled there, it can be installed at the specified tool position, thus improving workability and extremely easy There is an advantage that the tool can be set by simple operation.

  The present invention will be described based on the illustrated embodiment. This embodiment apparatus is a setting apparatus for attaching a cutting tool such as an end mill to a shrink-fit tool holder with a predetermined protruding length.

  As can be understood from FIGS. 1 to 5, the apparatus of the present invention includes a base 10 having legs 10a and 10b, a measuring column 20 planted and fixed at a substantially central portion of the upper surface of the base 10, and this measurement. A master gauge rod 30 planted and fixed on the base 10 at a predetermined distance from the support column 20 and a predetermined distance from the measurement support column 20 to the opposite side and arranged on a substantially straight line with the master gauge rod 30. The tool holder cradle 40, a straight line connecting the master gauge bar 30 and the tool holder cradle 40 (in the front in FIG. 2) in the same direction from the measuring column 20 to a base that is a predetermined distance away. The set spindle 50 is fixedly set up, and the adjusting means 60 is installed on the lower part of the base 10 on a straight line connecting the tool holder support 40 and the set spindle 50.

  Further details will be described. As shown in FIG. 4, the measurement column 20 includes a cylindrical column main body 21 that is planted and fixed on the upper surface of the base 10, a shaft portion 22 a that is inserted in a fitting state into an insertion hole 21 a that opens at the upper end, The screw 22b is formed so as to have a gauge shaft 22 having a small diameter portion 22c and an end screw 22d on the tip end side, and a nut 23 positioned at the upper end of the column main body 21 by screwing with the gauge shaft 22, a gauge shaft The gauge plate 24 is inserted into the small-diameter portion 22c at the tip of 22 in a fitted state and is coupled to a gauge plate 24 having a gauge surface (measurement surface) on the lower surface and a screw 22d at the tip of the gauge shaft 22. And a tightening nut 25 for maintaining and fixing. The gauge shaft 22 set at a predetermined position by the nut 23 is locked by the fixing screw 25.

  The master gauge rod 30 has the same structure as that of the measurement column 20, and is fitted into a cylindrical sleeve 31 planted and fixed on the upper surface of the base 10 and an insertion hole 31a opened at the upper end as shown in FIG. A shaft portion 32a to be inserted at the center, a screw 32b formed in the middle, a gauge shaft 32 having a small diameter portion 32c and a spherical surface 32d at the end, and a sleeve 31 that is screwed into the gauge shaft 32 And a nut 33 located at the upper end of the.

On the other hand, the tool holder cradle 40 has a substantially cylindrical bush shape, a shaft portion 41 that fits into a through hole 10 c formed in the base 10, and a flange having a thickness U that abuts on the upper surface of the base 10. The part 42 has a tapered hole 43 on the inner surface. And, as clearly shown in FIG. 1, the shank portion taper of the tool holder H is engaged, and at this time, the taper hole diameter size on the upper surface of the flange portion 42 of the tool holder cradle 40 is set to the reference size, A distance S from the upper end to the tip of the cutting tool T mounted on the tool holder H is set as a predetermined protrusion length. Therefore, with the master gauge bar, as shown in FIG. 1, a predetermined tool protrusion length S (M−U) can be set with a dimension M from the upper surface of the base 10 to the spherical surface 32b.

Next, details of the adjusting means 60 which is the main configuration of the present invention will be described. As clearly shown in FIG. 3, the adjusting means 60 is disposed at the lower part of the base 10 at an intermediate position on the straight line connecting the tool holder cradle 40 and the set spindle 50, and is fixed to the lower surface of the base 10. A bottomed cylindrical nut block 61 and a shaft portion 62b having a screw portion 62a screwed into the screw hole 61a of the nut block 61, a large-diameter shaft portion 62c positioned outside the nut block 61, and The horizontal screw 63 is disposed horizontally in contact with the end surface of the large-diameter shaft portion 62c of the adjustment screw 62 formed with the following knob portion 62d, and the adjustment screw 62 is attached to both ends of the horizontal rod 63. The two push rods 64a and 64b are integrated in parallel with the axis of the two, and both of the push rods 64a and 64b have the same length (h in the figure) Push rod 64a is set spin Has been inserted and disposed from the bottom of the Le 50 into the interior, the other push rod 64b is inserted and placed into the interior from the bottom side, that the shank end bottom of the tool holder H which is attached to the tool holder receiving table 40.

In this way, the adjusting means is configured. By rotating the adjusting knob 62d, the horizontal rod 63 can be moved in the vertical direction in the figure by pressing on the end surface of the large-diameter shaft portion 62c. Two push rods can be moved up and down together.

Next, the operation of this component device will be described. That is, when setting and attaching a predetermined tool protrusion length to the shrink-fit tool holder H, first, the tip (upper end surface) of the master gauge rod 30 is set to a predetermined dimension position. For example, if the protruding length S is 150 mm and the height U of the tool holder cradle 40 is 50 mm, the distance M from the upper surface of the base 10 to the tip position of the master gauge rod 30 is 150 + 50 = 200 mm. This dimension is adjusted so that the nut 23 is turned in the measurement column 20 to move the gauge shaft 22 up and down so that the tip of the gauge shaft 32 spherical surface 32b of the master gauge rod 30 contacts the lower surface of the gauge plate 24.

Next, a predetermined tool, that is, a tool T to be mounted on the tool holder H is inserted into the set spindle 50. Then, the measuring column 20 is rotated by 90 ° and rotated so that the lower surface of the gauge plate 24 is directly above the set spindle 50.

Then, the knob 62d of the adjustment screw 62 is turned to push up the tool T with the tip of the first push rod 64a and turn until the tip of the tool T comes into contact with the lower surface of the gauge plate 24.
The position of contact in this way is the position of the predetermined protruding length S, and then the tool T is removed and mounted on the tool holder H, but before this operation, as shown in FIG. Then, the peripheral portion of the tool holder H is heated by the shrink fitting device F (by induction heating method or hot air method), and the tool T is inserted. Since the protrusion rod 64b is inserted and disposed in the tool holder H, the position where the rear end of the tool abuts against the tip of the push rod 64b is a predetermined position S, and cooling is performed when insertion is finished. The tool T is firmly fixed at a predetermined position.

As described in the above description, the device of the present invention moves and sets the tool rear end position in the tool holder to the tool rear end position provided on the set spindle side that is set away from the tool holder. Since the setting operation can be performed in a visible form, it is advantageous for setting a shrink-fit tool, but it can also be used in a general type tool holder.

The external appearance explanatory drawing which looked at the protrusion length setting apparatus by this invention from the side is shown. FIG. 2 shows a top view of FIG. 1. AA sectional drawing of FIG. 2 is shown. FIG. 4 shows a partially enlarged cross-sectional view of the measurement strut 20 portion. FIG. 5 shows a partially enlarged cross-sectional view of the master gauge rod 30 portion.

Explanation of symbols

10 base
20 Measuring column
24 gauge plate
30 Master gauge bar
40 Tool holder cradle
50 set spindle

60 Adjustment means

61 Nut block

62 Adjustment screw

63 horizontal fence

64a, 64b push rod

H Tool holder T
tool
S Protrusion length

Claims (2)

A master gauge bar, a set spindle, and a tool holder receiving member, which are arranged and fixed at predetermined intervals, respectively, with respect to a measuring spindle that is planted and arranged at a substantially central portion of the upper surface of the base, and the set spindle And a protrusion length adjusting means provided at the lower part of the base on which the tool holder receiving member is arranged, and this protruding length adjusting means is inserted from the rear end of the tool holder attached to the tool holder receiving member. A push rod that presses the rear end of the cutting tool and a push rod that moves in parallel with the same length as this push rod are inserted from the bottom of the set spindle into the inside and set in advance by a master gauge rod. The tip position indicating the predetermined protrusion length is moved to the lower surface position of the gauge plate that is horizontally mounted on the measuring spindle, and the tip of the cutting tool inserted into the set spindle is the gate. The protruding length adjustment means is operated until it makes contact with the bottom surface of the plate, and the push rod is moved up and down, and the tool rear end position in the tool holder is provided on the set spindle side installed away from the tool holder. A tool protrusion length setting device for a tool holder, which is set by moving to a tool rear end position. The tool holder length setting device for a tool holder according to claim 1, wherein the tool holder is a shrink fitting method, and includes a shrink fitting device disposed in the vicinity of the base.

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