JP3102050U - Lock nut used for cutting tool collet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock nut used for a cutting tool collet which can stably hold a cutting tool and maintain a stable state of an axis of the cutting tool during high-speed rotation.
SOLUTION: The nut 10 has one hollow shaft hole, one thread portion on the inner wall of the shaft hole, and one snap ring 13 on the side adjacent to the thread portion. Have been. The snap ring 13 is eccentrically opposed to and protrudes from the shaft hole axis. At least one concave portion is provided at a position corresponding to the protruding portion of the snap ring 13 of the nut 10. The concave portion has a weight balance effect on the nut 10, holds the cutting tool, and rotates at a high speed. The axis of the cutting tool can be held in a stable state.
[Selection diagram] FIG.

Description

  The present invention relates to a holding part of a cutting tool of a cutting machine, and more particularly to a lock nut used for one type of cutting tool collet.

  FIG. 1 shows one type of cutting tool collet part used for a cutting machine such as a milling machine. In most cases, one shank 1 is connected to a main shaft of the cutting machine. And a nut 3 used to fix the collet 2 tightly. The above-mentioned parts can firmly clamp one cutting tool 4 after assembly and connection ( 2). In addition, the collet can be easily replaced with the cutting tool 4 and, at the same time, the collet 2 can be separated from the shank 1. A single tapered groove 2a is provided in the lower part of the collet 2, and a single annular and eccentrically provided snap ring 3a is provided on the inner wall of the nut 3. When the nut 3 is assembled, the protruding portion of the snap ring 3a is fitted into the tapered groove 2a so that when the nut 3 is turned downward, the snap ring 3a is connected to one of the tapered grooves 2a. The side wall is touched, whereby the collet 2 can be moved down and separated from the shank 1.

Although the above-described structure allows the collet 2 to be removed at the same time as the replacement of the cutting tool, the snap ring 3a is eccentrically protruded when the nut 3 is formed and manufactured. In a situation where the weight is heavier than the other parts, the nut 3 is firmly connected to the shank 1, and under the condition that the shank 1 rotates at high speed, if one side of the nut 3 is unbalanced, the cutting tool Shaking occurs during rotation of the cutting tool 4 (as indicated by the imaginary line in FIG. 2), and the axis of the cutting tool 4 cannot maintain a stable state. However, in a situation where the design rotation speed of these cutting machines is increasing day by day and the required accuracy for the workpiece is becoming more and more severe, the problem of shaking of the cutting tool 4 derived from this weight distribution is a problem of the workpiece. The cutting tool collet still has a place to be improved.
In view of this, the present inventor thought in detail, and accumulated many years of research and development experience of the cutting tool collet, and finally devised the present invention.

  That is, the main object of the present invention is to provide a lock nut used for one type of cutting tool collet which stably holds the cutting tool and enables the axis of the cutting tool to maintain a stable state during high-speed rotation. is there.

  In order to achieve the above-mentioned object, a lock nut used for one type of cutting tool collet provided by the present invention is provided with one hollow shaft hole in the nut, and one nut in the shaft hole inner wall of the nut. A thread portion is provided, and one snap ring is provided on a side adjacent to the thread portion, and the snap ring faces the shaft hole axis, and is eccentrically protruded. The features are as follows. At least one concave portion is provided at a position corresponding to the protruding portion of the snap ring of the nut, and the concave portion produces a weight balancing effect on the nut, thereby holding the cutting tool and rotating at high speed. At times, the axis of the blade can be kept in a stable state.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Please refer to FIG. 3 to FIG. The lock nut 10 used for the cutting tool collet according to one embodiment of the present invention is one ring-shaped body and has one hollow shaft hole 11. A single threaded portion 12 is provided on one side, and one snap ring 13 is provided on a side adjacent below the threaded portion 12, and the snap ring 13 faces the shaft center of the shaft hole 11 and is biased. A plurality of engaging grooves 14 are provided at intervals on the outer peripheral surface of the nut 10, and each engaging groove 14 engages with pliers (not shown in the figure). Used to rotate the nut 10. The above is a prior art, and the main improvements of this embodiment are as follows.

  At least one recess 15 is provided at a position on the outer peripheral surface of the nut 10 corresponding to the projecting portion of the snap ring 13. After the test and calculation, the recess 15 is cut into a groove having a predetermined groove depth and length, and the nut 10 can be balanced in overall weight distribution by installing the recess 15. In this embodiment, two concave portions 15 are directly formed on the engaging groove 14 corresponding to the projecting portion of the snap ring 13 by an oblique cutting method. In other words, in the situation where the side of the nut 10 where the snap ring 13 is installed is biased, the weight is distributed evenly by installing the recess 15 correspondingly. Further, the concave portion 15 originally has the purpose and effect of providing the engaging groove 14.

  Please refer to FIG. 7 for an illustration of another embodiment of the nut according to the present invention. The different points of the nut 20 from the aforementioned nut 10 are as follows. The concave portion 22 provided corresponding to the eccentric snap ring 21 of the nut 20 is installed at the same depression depth, so that the weight of the nut 20 is finally distributed on average, and the shaved area of the concave portion 22 is obtained. Is larger than the area of the other engagement grooves 23.

  Please refer to FIG. 8 for an illustration of yet another embodiment of the nut according to the present invention. One eccentric snap ring 31 is provided on the inner wall of the nut 30, and a regular hexagonal section 32 is provided on the outer peripheral surface thereof. Each section 32 is engaged with a wrench to rotate the nut 30. Used. The concave portion 33 in this embodiment is located on the outer surface of the nut 30 and is adjacent above the cut surface 32 corresponding to the portion of the snap ring 31, and the concave portion 33 also has an effect of balancing the weight of the nut 30. Have.

  The following is an actual application example of the nut in the present invention, but it should be pointed out that all the nuts of the above-mentioned embodiments can achieve the desired stabilizing effect. Hereinafter, the case of the lock nut 10 will be described as an example.

  Please refer to FIG. 9 and FIG. When the shank 40, the collet 50 and the nut 10 are combined with each other to clamp one blade 60, the weight distribution of the whole nut 10 is determined after the recess 15 is cut and formed in correspondence with the snap ring 13. The weight distribution cancels each other under the condition that one side increases and the other side decreases, and finally the weight of each part of the nut 10 is distributed on average. In this way, when the shank 40 moves the cutting tool 60 to rotate at high speed, the axis of the cutting tool 60 can be maintained in a stable state, and the cutting tool 60 does not shake or vibrate. . For this reason, when processing and manufacturing a workpiece using this embodiment, a workpiece having accurate dimensions can be obtained.

  Summarizing the above, the present invention certainly has advanced practicality and convenience in use among similar products, and the equivalent product was found to be used in publication or publication before the application for the present invention. Due to the lack of this, the present invention does have new patent requirements and is filed here by law.

It is an exploded sectional view of the conventional blade collet. It is a schematic diagram of the operation state of the conventional blade collet. FIG. 3 is a perspective view of a lock nut used in the cutting tool collet according to one embodiment of the present invention. FIG. 3 is a plan view of a lock nut used in the cutting tool collet according to one embodiment of the present invention. FIG. 3 is a bottom view of the lock nut used in the cutting tool collet according to one embodiment of the present invention. FIG. 3 is a schematic view of a lock nut used in the cutting tool collet according to one embodiment of the present invention. FIG. 4 is a partial cross-sectional view of a lock nut used in a cutting tool collet according to another embodiment of the present invention. FIG. 4 is a perspective view of a lock nut used in a cutting tool collet according to still another embodiment of the present invention. FIG. 4 is a schematic view of a lock nut and other cutting tool collet components used in the cutting tool collet according to one embodiment of the present invention. FIG. 4 is a schematic view of a lock nut and other cutting tool collet components used in the cutting tool collet according to one embodiment of the present invention.

Explanation of reference numerals

  Reference Signs List 10 nut, 11 shaft hole, 12 thread, 13 snap ring, 14 engagement groove, 15 recess, 20 nut, 21 snap ring, 22 recess, 23 engagement groove, 30 nut, 31 snap ring, 32 cross section, 33 Recess, 40 shank, 50 collet, 60 cutting tools

Claims (4)

A hollow shaft hole is provided, and a thread portion is provided on the inner wall of the shaft hole, and a snap ring is provided on a side adjacent to the thread portion, and the snap ring faces the axis of the shaft hole and is eccentric. A lock nut used for a protruding cutting tool collet,
At least one concave portion is provided at a position corresponding to the protruding portion of the snap ring, and the concave portion has a weight balancing effect on the nut so as to clamp the cutting tool, and when rotating at a high speed, the shaft of the cutting tool is rotated. A lock nut used for a cutting tool collet, which can hold a heart in a stable state.   The lock nut according to claim 1, wherein the recess is provided on an outer peripheral surface of the nut.   Several engagement grooves are provided at intervals on the outer peripheral surface of the nut, the engagement grooves are used to engage with pliers, and the concave portions correspond to protrusions of the snap ring. The lock nut used in the cutting tool collet according to claim 2, wherein the lock nut is provided in the mating groove.   A regular polygonal cross section is provided on the outer peripheral surface of the nut, the cross section is used for engaging with a wrench, and the concave portion is provided on a cross section corresponding to a protruding portion of the snap ring. The lock nut used for the cutting tool collet according to claim 2, characterized in that:

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