JP3200356U - Firmly assembled high-precision cutting blade holder - Google Patents

Abstract

A highly assembled high-accuracy cutting blade holder that performs highly accurate machining during high-speed rotation is provided. A cutting blade holder includes a main body, a collet, a cutting blade, and a fixing cap. The cutting blade is inserted into the collet. The collet is assembled to the main body together with the cutting blade. The fixed cap is attached to the main body, and the cutting blade projects from the fixed cap. The main body has a fixed part. The collet has an annular groove. The fixed part has a fixed part end face. The annular groove has a first surface. The fixed portion end surface and the first surface are located apart from each other. By limiting the distance between the fixed portion end surface and the first surface, the contact area between the main body and the collet is increased, and the tightening force is enhanced. Thus, the cutting blade holder can firmly tighten the collet for high-precision machining. [Selection] Figure 1

Description

  The present invention relates to a machine tool, and more specifically to a high-precision cutting blade holder (or cutter holder) that holds a cutting blade firmly.

  Referring to FIG. 4, the conventional cutting blade holder includes a main body 60, a collet 70, a cutting blade (or cutter) 80, and a fixed cap 90. The cutting blade 80 is inserted into the collet 70, and the collet 70 and the cutting blade 80 are assembled to the main body 60. The fixing cap 90 has an internal thread portion 91 and is attached to the main body 60, whereby the cutting blade 80 can protrude from the fixing cap 90.

  The main body 60 has two end portions, a fixing portion 61, and an internal socket 62. The fixing portion 61 is disposed at one end portion and includes an external screw portion 611 and a fixing portion end surface 612. The inner socket 60 and the fixing portion 61 are disposed at the same end portion of the main body 60, and the inner socket 62 is a tapered hole extending from one end portion of the main body 60 to the other end portion. The collet 70 has two end portions, a coupling portion 71, a fixed cap contact portion 72, and an annular groove 73. The abutting portion 71 has a conical shape, corresponds to the inner socket 62 in the cross-sectional shape, and is attached to one end of the collet 70. The fixed cap contact portion 72 is disposed on the opposite side of the collet 70. The annular groove 73 is disposed between the coupling portion 71 and the fixed cap contact portion 72. The annular groove 73 has a first surface 731 and a second surface 732, and the first surface 731 and the second surface 732 are parallel to the radial direction. The annular groove 73 has two sides. The first surface 731 is located on the side of the annular groove 73 adjacent to the coupling portion 71. The second surface 732 is located on the other side of the annular groove 73 adjacent to the fixed cap contact portion 72.

  A contact area is defined between the internal socket 62 of the body 60 and the coupling 71 of the collet 70. Because the contact area is small, the collet 70 projects far away from the body 60. The fixed portion end surface 612 and the first surface 731 of the collet 70 are separated by a distance between 3.5 mm and 3.7 mm. Due to the small contact area, the force applied to the main body 60 for fixing the collet 70 is weak, and the cutting blade 80 is easily distorted. Further, the main body 60 of the conventional cutting blade holder and the fixing cap 90 are connected by screwing, and a gap is formed between the outer screw portion 611 of the fixing portion 61 and the inner screw portion 91 of the fixing cap 90. When the conventional cutting blade holder rotates at high speed, this gap easily causes vibration, and the main body 60 cannot abut against the collet 70. The problems presented here cause a balance imbalance in conventional cutting blade holders and reduce machining accuracy.

  In order to overcome the shortcomings of this conventional cutting blade holder, the present invention provides a highly assembled cutting blade holder that is firmly assembled to reduce or prevent the aforementioned problems.

  The main object of the present invention is to provide a tightly assembled high precision cutting blade holder that performs high precision machining during high speed rotation.

  The cutting blade holder includes a main body, a collet, a cutting blade, and a fixed cap, and the cutting blade is inserted into the collet. The collet is assembled to the main body together with the cutting blade. The fixed cap is attached to the main body, and the cutting blade projects from the fixed cap. The main body of the present invention has a fixing portion, and the collet has an annular groove. The fixed part has a fixed part end face. The annular groove has a first surface. The fixed portion end surface and the first surface are separated in distance. In order to expand the contact area between the main body and the collet, it is possible to eliminate the insufficient fixing force of the conventional cutting blade holder by limiting the distance between the end surface of the fixing portion and the first surface. It is. The present invention provides a highly assembled high-precision cutting blade holder that can securely fix a collet for high-precision machining.

  Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the associated drawings.

FIG. 1 is a perspective view of a highly assembled high-precision cutting blade holder according to the present invention. FIG. 2 is an exploded perspective view of the firmly assembled high-precision cutting blade holder shown in FIG. FIG. 3 is a partial side view of the firmly assembled high precision cutting blade holder of FIG. FIG. 4 is a partial side view of a conventional cutting blade holder.

  Referring to FIGS. 1 and 2, a highly assembled high-precision cutting blade holder according to the present invention includes a main body 10, a collet 20, a cutting blade 30, and a fixed cap 40. The cutting blade 30 is inserted into the collet 20. The collet 20 and the cutting blade 30 are assembled to the main body 10. The fixed cap 40 is attached to the main body 10, and the cutting blade 30 protrudes from the fixed cap 40.

  2 and 3, the main body 10 has two end portions and a fixing portion 11 that defines a fixing portion end surface 111 formed at one end portion of the main body 10. The fixing portion 11 includes a first thread portion 112, a first contact surface 113, a second contact surface 114, and an internal socket (concave portion) 115. The fixing part 11 has an outer surface. The first thread portion 112 is an external screw formed on the outer surface of the fixed portion 11 and adjacent to the fixed portion end surface 111. The first thread portion 112 has two sides. The first contact surface 113 and the second contact surface 114 are disposed on two sides of the first thread portion 112, respectively. The first contact surface 113 is adjacent to the fixed portion end surface 111. Each of the first contact surface 113 and the second contact surface 114 has an outer diameter. The outer diameter of the first contact surface 113 is smaller than the outer diameter of the second contact surface 114. The internal socket 115 is a tapered hole extending from the fixed portion end surface 111 to the other end of the main body 10.

  Referring to FIGS. 2 and 3, the collet 20 includes two ends, a coupling portion 21, a fixing cap contact portion 22, an annular groove 23, and a center hole 24. The coupling portion 21 has a conical shape and corresponds to the inner socket 115 in the cross-sectional shape. The coupling portion 21 is disposed at one end of the collet 20. The fixed cap contact portion 22 is annular and has an inclined contact surface, and is located at the other end of the collet 20. The annular groove 23 is formed between the coupling portion 21 and the fixed cap contact portion 22. The annular groove 23 includes a first surface 231 and a second surface 232. The first surface 231 and the second surface 232 are parallel to each other in the radial direction. The annular groove 23 has two sides. The first surface 231 is located on the side of the annular groove 23 adjacent to the coupling portion 21. The second surface 232 is located on the other side of the annular groove 232 adjacent to the fixed cap contact portion 22. The central hole 24 is defined in the axial direction from the coupling portion 21 toward the fixed cap contact portion 22 and has an inner diameter.

  Referring to FIGS. 2 and 3, the cutting blade 30 has two ends, a blade portion 31 and a collet assembly portion 32. The blade part 31 is located at one end of the cutting blade 30. The collet assembly 32 is located at the other end of the cutting blade 30 and has an outer diameter. The outer diameter of the collet assembly 32 is substantially equal to the inner diameter of the center hole 24 of the collet 20.

  2 and 3, the fixing cap 40 has a cap plate and a side wall connected to the cap plate. The side wall of the fixed cap 40 has an inner surface. The fixed cap 40 includes a through hole 41, a collet contact portion 42, a second thread portion 43, a first contact portion 44, and a second contact portion 45. The through hole 41 is defined through the middle portion of the cap plate and has an inner surface. The collet contact portion 42 is formed on the inner surface of the through hole 41. The collet abutting portion 42 is annular and has an inclined surface that abuts against the fixed cap abutting portion 22. The second thread portion 43, the first contact portion 44, and the second contact portion 45 are disposed on the inner surface of the side wall of the fixed cap 40. The second thread portion 43 is an inner screw that engages with the outer thread of the first thread portion 112. The second thread portion 43 has two side portions. The first contact portion 44 and the second contact portion 45 are respectively disposed on the two side portions of the second screw thread portion 43. The first contact portion 44 is adjacent to the collet contact portion 42 and contacts the first contact surface 113 of the main body 10. The second abutting portion 45 abuts on the second abutting surface 114 of the main body 10. The first contact portion 44 and the second contact portion 45 each have an inner diameter. The inner diameter of the first contact portion 44 is smaller than the inner diameter of the second contact portion 45.

  2 and 3, the collet assembly 32 of the cutting blade 30 is inserted into the center hole 24 of the collet 20 in order to assemble the cutting blade holder of the present invention. Next, the collet 20 and the cutting blade 30 are assembled to the main body 10 via the coupling portion 21 of the collet 20 that fits and contacts the internal socket 115 of the main body 10. Finally, the fixing cap 40 is screwed (screwed) to the main body 10 via the second thread portion 43 and the first thread portion 112. As a result, the collet contact portion 42 of the fixed cap 40 contacts the fixed cap contact portion 22 of the collet 20. In this way, the blade portion 31 of the cutting blade 30 can protrude from the through hole 41 of the fixed cap 40.

  The fixed portion end surface 111 of the main body 10 and the first surface 231 of the collet 20 are separated by a distance W2. The present invention limits the distance W2 to between 0.1 mm and 0.6 mm. Compared with the conventional cutting blade holder, the distance W2 is smaller than the distance W1 of the conventional cutting blade holder. The smaller distance W2 makes it possible to increase the contact area between the internal socket 115 of the main body 10 and the coupling part 21 of the collet 20. The larger contact area between the inner socket 115 and the coupling part 21 can realize the purpose of increasing the tightening strength (clamp strength). The present invention can eliminate the disadvantage of the conventional cutting blade holder that vibration is easily generated. The first contact portion 44 and the second contact portion 45 of the fixed cap 40 are in contact with the first contact surface 113 and the second contact surface 114 of the main body, respectively. Reduces the occurrence of vibration while the cutting blade holder rotates at high speed.

While numerous features and advantages of the invention have been described above, together with details of the structure and function of the invention, the disclosure is illustrative only and is a broad, general term for the appended claims. Modifications can be made within the full scope of the principles of the invention, particularly in details such as the shape, dimensions, and arrangement of parts.

Claims (4)

The body,
A collet connected to the body;
A cutting blade,
A fixing cap,
The main body has two end portions, and a fixing portion having a fixing portion end surface and an internal socket formed at one end portion of the main body, and
The collet is
Two ends,
A coupling portion corresponding to the inner socket in a cross-sectional shape and disposed at one end of the collet, and fitting and abutting on the inner socket;
An annular groove adjacent to the coupling portion, the annular groove being parallel to two side portions and a radial direction of the annular groove and positioned on one side of the annular groove adjacent to the coupling portion; An annular groove, wherein the first surface and the fixed portion end surface are separated by a distance of 0.1 mm to 0.6 mm;
A central hole defined through the collet axially from the coupling portion and having an inner diameter;
The cutting blade holder according to claim 1, wherein the cutting blade has a collet assembly portion inserted into the center hole and having an outer diameter substantially equal to the inner diameter of the center hole. The fixing part is
The outer surface,
An outer screw formed on the outer surface of the fixed portion and adjacent to the end surface of the fixed portion; and a first thread portion having two side portions;
A first abutting surface disposed on the outer surface of the fixed portion, positioned on one of the side portions of the first threaded portion, and adjacent to the end surface of the fixed portion;
The fixing cap is
A sidewall having an inner surface;
An inner screw disposed on an inner surface of the side wall and engaging the outer screw of the first threaded portion; and a second threaded portion having two side portions;
A first abutting portion disposed on an inner surface of the side wall of the fixing cap and disposed on one side of the second threaded portion and adjacent to the second threaded portion; Including
The cutting blade holder according to claim 1, wherein the first abutting portion abuts on the first abutting surface. The fixed portion has a second contact surface disposed on the outer surface of the fixed portion, and the second contact surface is disposed on one of the side portions of the first thread portion. And adjacent to the first threaded portion,
The fixed cap has a second contact portion disposed on an inner surface of the side wall of the fixed cap, and the second contact portion and the first contact portion are the second threaded portion. The cutting blade holder according to claim 2, wherein the cutting blade holder is disposed on each of the two side portions, and the second abutting portion abuts against the second abutting surface. The first abutment surface has an outer diameter;
The second contact surface has an outer diameter larger than the outer diameter of the first contact surface;
The first contact portion has an inner diameter;
The cutting blade holder according to claim 3, wherein the second contact portion has an inner diameter larger than an outer diameter of the first contact portion.

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