JPH059839U - Cutting tool holder - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cutting tool holder capable of performing balance adjustment with a cutting tool attached and easily performing the balance adjustment even in a fine range. A cutting tool holder that holds a cutting tool by a collet (12) attached to one end and is attached to a machine tool at the other end, wherein the dovetail groove (14) extends all around the circumference. ) And a plurality of balance weights (16) movably arranged in the dovetail groove (14). The balance weight (16) is formed so as not to come out of the dovetail groove (14), and is fixed to an arbitrary portion of the dovetail groove (14) with a screw (32).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention holds a cutting tool by a collet mounted on one end and The present invention relates to a cutting tool holder attached to a machine tool at an end.

[0002]

[Prior art]

  High-speed rotation of machine tool spindles has become a major trend, and along with this, cutting Balance adjustment is essential when the tool holder rotates at high speed.

[0003]   Currently, when adjusting the balance of the cutting tool holder, the entire outer peripheral surface of the cutting tool holder is ground. For finishing, or for cutting tool holders with multiple screw holes extending in the axial direction of the cutting tool holder. Install at regular intervals in the circumferential direction of the ruda, By screwing in or scraping off the unbalanced part of the cutting tool holder. ing.

[0004]

[Problems to be solved by the device]

  In the case of grinding the entire outer peripheral surface of the cutting tool holder, the cutting tool holder Although it is sufficient to adjust the balance of the cutting tool, it is necessary to adjust the balance when the cutting tool is installed. I can't.

[0005]   With a screw that is screwed into the required screw hole, the screw is easy to loosen and the position of the screw hole However, it is not possible to make fine balance adjustments. Also, install and remove the screws. It takes time to remove it.

[0006]   Balance adjustment is difficult with a tool that cuts off the unbalanced part of the cutting tool holder It takes a long time, and if you change the cutting tool, it will be in an unbalanced state. , Not an efficient task.

[0007]   The purpose of the present invention is to make a balance adjustment with a cutting tool attached, A cutting tool tool that can easily perform the balance adjustment even in a fine range. To provide Luda.

[0008]

[Means, actions and effects for solving the problems]

  The present invention holds a cutting tool by a collet mounted on one end and A cutting tool holder that is attached to the machine tool at its end and extends all around the circumference. And a plurality of balance weights movably arranged in the groove. The balance weight is formed so as not to come out of the groove, and the balance weight is set at an arbitrary position of the groove. It can be fixed in place.

[0009]   Attach the cutting tool holder to the balance measuring machine and set the balance weight in the groove. The balance adjustment is completed by moving along the circumferential direction and fixing.

[0010]   Since the groove extends around the entire circumference in the circumferential direction, the balance weight is attached to the cutting tool holder. Since it can be moved to any position and fixed at that position, fine balance adjustment Is possible.

[0011]   Since the balance can be adjusted simply by moving and fixing the balance weight, Adjustment is easy and easy.

[0012]   The balance can be adjusted while holding the cutting tool with the collet, and The fine adjustment of the machine can sufficiently cope with the high speed rotation of the machine tool.

[0013]   The groove is formed on the outer peripheral surface of the cutting tool holder, and the shaft of the cutting tool holder is formed. It is preferable to have two groove surfaces spaced in the line direction. Two grooves in this case The distance between the radially outer parts of the groove surface is smaller than the distance between the inner parts. Is formed as an inclined surface. And, the balance weight is 2 It has two sloping surfaces that fit one groove surface.

[0014]   When centrifugal force acts on the balance weight, the two inclined surfaces of the balance weight They come into close contact with the two groove surfaces and bite into a wedge shape. by this, The balance weight will be fixed more firmly and will not come off easily.

[0015]   When the groove is formed on the outer peripheral surface, the groove and the balance weight are covered. It is preferable to provide a cylindrical cover.

[0016]   By covering the groove and the balance weight with a cover, the wind The generation of cutting noise can be prevented. Also, since the groove is on the outer peripheral surface, the cover has a cylindrical shape. It only needs to be formed, and can be easily manufactured. And the cover is easy to install It

[0017]   The balance weight penetrates the balance weight in the radial direction, and It is preferable to have a screw that abuts on the bottom surface.

[0018]   As you turn the screw, you will hit the bottom. By turning it further, the balance Eight can be fixed. The balance weight moves when the screw is turned in the opposite direction and loosened. It will be possible.

[0019]

【Example】

  As shown in FIG. 1, the cutting tool holder 10 has a core attached to one end 11a. Holding the cutting tool by means of a hood 12 and mounting it on the machine tool at the other end 11b. And the groove 14 extending all around in the circumferential direction, and movably arranged in the groove 14. A plurality of balance weights 16 placed therein.

[0020]   Fit the tapered surface 18 of the collet 12 to one end 11a of the cutting tool holder. A tapered surface 20 is provided, and a nut 22 is screwed in. Screw nut 22 When turned in the retracted direction, the tapered surface 18 of the collet 12 is pressed against the tapered surface 20. , The collet 12 deforms inward in the radial direction. Due to this deformation, the inner surface 1 9 holds a cutting tool (not shown). By turning the nut 20 in the opposite direction, The cutting tool can be removed. On the other end 11b of the cutting tool holder, A taper surface 21 that is fitted into the spindle hole of the working machine is provided.

[0021]   The groove 14 is formed on the outer peripheral surface of the cutting tool holder 10 in the illustrated embodiment. , Has two groove surfaces 24, 25 spaced in the axial direction of the cutting tool holder 10. . The two groove surfaces 24, 25 are, as shown in detail in FIG. It is formed as an inclined surface such that the distance between the inner parts is smaller than the distance between the inner parts. Has been. That is, the groove 14 is a groove and its cross section is such that the outer peripheral side is the inner peripheral side. The trapezoidal shape is narrower than the width.

[0022]   The groove 14 having the two groove surfaces 24 and 25 formed of the inclined surface is processed by turning. Can be engineered. However, in the illustrated embodiment, the shoulder of the cutting tool holder 10 While forming the inclined surface 24, the cylindrical end material 26 having the inclined surface 25 is fixed by the screw 28. Then, the groove 14 is formed.

[0023]   The plurality of balance weights 16 are formed so as not to come out of the groove 14, It can be fixed at any place of 4.

[0024]   As shown in detail in FIG. 3, the balance weight 16 has two groove surfaces 24 of the groove 14. , 25 which are respectively fitted to the shafts of the cutting tool holder 10 It is spaced apart in the direction of the line, which prevents it from coming out of the groove 14. It As shown in FIG. 2, for example, three balance weights 16 are provided, and their radius is The thickness in the direction is smaller than the depth of the groove 14. Circumferential direction of balance weight 16 The end surface of the cutting tool holder 10 should be formed to coincide with the surface including the axis C of the cutting tool holder 10. Is preferred.

[0025]   The balance weight 16 penetrates the balance weight in the radial direction, and Has a screw 32 that abuts the bottom surface of the. When screwing in the screw 32, The tip abuts the bottom surface of the groove 14 as shown in FIG. Further screw 32 When inserted, the two inclined surfaces 30 and 31 of the balance weight 16 become the two groove surfaces of the groove 14. The balance weight 16 is fixed by being pressed closely against 24 and 25 respectively. It By turning the screw 32 in the opposite direction, the balance weight 16 is unlocked. .

[0026]   A cylindrical cover 34 is attached to the cutting tool holder 10 and includes a groove 14 and a bar. It covers the lance weight 16. To attach the cover 34, the O After the ring 36 is arranged, the cover 34 is pushed so as to cover the end material 26. so Then, the O-ring 36 is compressed, but the end of the cover 34 passes through the O-ring 36. Then, the O-ring 36 is restored and receives the end portion of the cover 34. by this The cover 34 can be prevented from coming off.

[0027]   When the cover 34 is attached, it is possible to prevent wind noise from being generated and the balance weight. Prevents the balance weight from splashing when you forget to tighten the screw 32 of the weight 16 This is preferable from the viewpoint of safety.

[Brief description of drawings]

FIG. 1 is a front view in which an upper half of a cutting tool holder according to the present invention is shown in section.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view showing a groove, a balance weight and a cover.

[Explanation of symbols]

10 Cutting tool holder 12 collets 14 groove 16 balance weight 24, 25 groove surface 30, 31 Inclined surface 32 screws 34 cover

Claims (4)

[Scope of utility model registration request] 1. A cutting tool holder for holding a cutting tool by a collet attached to one end thereof and attached to a machine tool at the other end thereof, the groove extending all around in a circumferential direction, and the groove. A cutting tool holder, comprising: a plurality of balance weights movably disposed therein, the balance weights being formed so as not to come out of the groove, and being fixable at an arbitrary position of the groove. 2. The groove is formed on the outer peripheral surface of the cutting tool holder and has two groove surfaces spaced apart in the axial direction of the cutting tool holder, and these groove surfaces have a radius of the groove surface. 2. The balance weight is formed as an inclined surface such that the distance between the outer portions in the direction is smaller than the distance between the inner portions, and the balance weight has two inclined surfaces that match the two groove surfaces. Cutting tool holder described in. 3. The cutting tool holder according to claim 2, further comprising a cylindrical cover that covers the groove and the balance weight. 4. The cutting tool holder according to claim 1, wherein the balance weight has a screw that penetrates the balance weight in a radial direction and abuts against a bottom surface of the groove.