Insert holder and cutting tool assembly including same

Abstract

The present invention relates to an insert holder and a cutting tool assembly including the same, and includes an insert body to which an insert is attached and detached from a tool shank having a coupling opening, and an insert holder including a coupling protrusion protruding from one side of the insert body and detachably coupled to the tool shank, the coupling protrusion having a tapered contact portion that provides a fixing force for fixing the insert holder that contacts the coupling opening to the tool shank, and a contact surface that is coupled to a fastening member at a rear end of the tapered contact portion. Also, the insert holder and the cutting tool assembly including the same can be implemented in various ways depending on the embodiment.

Description

[Technical Field]

[0001] The present invention relates to an insert holder and a cutting tool assembly including the same, and relates to a cutting tool assembly that can ensure the connecting force between a tool shank and an insert holder that is replaceably connected to the tool shank and has an insert connected thereto, thereby ensuring the connecting reliability during operation. [Background technology]

[0002] The cutting tool can be provided with a tool coupling that securely connects the first component to the second component. In some such cutting tools, the tool coupling is a threaded coupling.

[0003] Examples of such cutting tools are disclosed in, for example, US Pat. No. 6,582,164, US Pat. No. 7,713,004 and US 2012 / 0009027.

[0004] In other such cutting tools, the tool coupling provides a differential action that securely fastens the first and second components together. Examples of such cutting tools are disclosed, for example, in GB 765943, US 4,930,956 and US 4,557,642.

[0005] In other such cutting tools, the tool coupling may include a generally radially extending stop surface. Examples of such cutting tools are disclosed in U.S. Pat. Nos. 6,506,003 and 5,988,953. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of these problems, and aims to provide an insert holder and a cutting tool assembly including the same, which can mount insert holders having inserts of various shapes using a single tool shank and can facilitate the assembly / disassembly process of the head module and the tool shank.

[0007] Another technical problem to be solved by the present invention is to provide an insert holder and a cutting tool assembly including the same, which can ensure connection reliability when connecting the insert holder and the tool shank and can maintain connection reliability between the insert holder and the tool shank even while the cutting tool is performing cutting operation.

[0008] The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0009] According to one embodiment of the present invention, there is provided a cutting tool assembly including a tool shank having a coupling opening, an insert body to which an insert is coupled and to which the insert is detachably attached, and an insert holder having a coupling protrusion protruding from one surface of the insert body and detachably coupled to the tool shank, the coupling protrusion contacting the coupling opening to provide a fixing force for fixing the insert holder to the tool shank. The diameter increases towards the rear end. and a contact surface that is coupled with a fastening member at the rear end of the tapered contact portion. The opposing surface of the coupling protrusion, with which the fastening member and the contact surface come into contact, is spaced a predetermined distance from the inner peripheral surface of the coupling opening and is not in contact with the inner peripheral surface of the coupling opening. The tapered contact portion is located between the fastening member and one of the contacting surfaces of the insert body and the tool shank. When the fastening member presses the contact surface, a bending force is generated at a predetermined distance from the tapered contact portion. It is possible. [Effects of the Invention]

[0010] In the insert holder and cutting tool assembly including the insert holder according to an embodiment of the present invention, the insert holder is detachably provided on the tool shank, so that insert holders having inserts of various shapes can be replaceably provided on the tool shank.

[0011] In addition, the insert holder and cutting tool assembly including the same according to one embodiment of the present invention allow various insert shapes to be used by simply replacing the insert holder, thereby reducing replacement time and ensuring ease of replacement, which has the advantage of improving productivity due to the reduced replacement time and ease of replacement.

[0012] In addition, the insert holder and cutting tool assembly including the insert holder according to one embodiment of the present invention have a circumferentially inclined tapered contact portion formed on the coupling protrusion of the insert holder on the tool shank on the surface opposite to the contact surface of the fastening member, and the tapered contact portion is caught and seated on the inner fastening surface of the tool shank due to the bending force caused by the pressure of the fastening member, thereby achieving a contact coupling, which not only ensures coupling reliability between the insert holder and the tool shank but also has the advantage of ensuring coupling reliability between the insert holder and the tool shank even during the process of driving the cutting tool. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic, assembled perspective view of a cutting tool assembly according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic, exploded perspective view of a cutting tool assembly according to one embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of the insert holder and tool shank separated and in another direction in a cutting tool assembly according to one embodiment of the present invention. [Figure 4] FIG. 4 is a partial perspective view, separated from one side, that schematically illustrates the connection between the insert holder and the tool shank in a cutting tool assembly according to one embodiment of the present invention. [Figure 5] FIG. 5 is a fragmentary perspective view, separated from one another, schematically illustrating the coupling of an insert holder and a tool shank in a cutting tool assembly according to an embodiment of the present invention. [Figure 6] FIG. 6 is a plan view showing a coupling protrusion formed on one surface of an insert body in a cutting tool assembly according to an embodiment of the present invention. [Figure 7A] FIG. 7A is a side view schematically showing the direction of force generation due to fixing and coupling by applying pressure to a fastening member in a state where a coupling protrusion is inserted into a coupling opening in a cutting tool assembly according to an embodiment of the present invention. [Figure 7B] FIG. 7B is a side view schematically illustrating the direction of force generation due to fixation and coupling caused by pressure applied to the fastening member in a state where the coupling protrusion is inserted into the coupling opening in the cutting tool assembly according to one embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view of a portion of a cutting tool assembly according to one embodiment of the present invention, where a tapered contact portion is formed on an insert holder. [Figure 9] FIG. 9 is a coupling diagram illustrating a state in which the coupling protrusion is seated in the coupling opening and tightly coupled by the fastening member in the cutting tool assembly according to one embodiment of the present invention. [Figure 10A] FIG. 10A is a cross-sectional view schematically illustrating another shape of the contact surface formed on the coupling protrusion and the tapered contact portion formed on the coupling opening in a cutting tool assembly according to an embodiment of the present invention. [Figure 10B] FIG. 10B is a cross-sectional view schematically illustrating another shape of the contact surface formed on the coupling protrusion and the tapered contact portion formed on the coupling opening in the cutting tool assembly according to one embodiment of the present invention. [Figure 10C] FIG. 10C is a cross-sectional view schematically illustrating another shape of the contact surface formed on the coupling protrusion and the tapered contact portion formed on the coupling opening in the cutting tool assembly according to one embodiment of the present invention. [Figure 11] FIG. 11 is a plan view showing a contact state between a coupling projection and a fastening member in a cutting tool assembly according to an embodiment of the present invention. [Figure 12] FIG. 12 is a rear view showing a state in which the coupling projection and the fastening member are in contact with each other in the cutting tool assembly according to the embodiment of the present invention. [Figure 13] FIG. 13 is a side view schematically illustrating the generation of a bonding force due to contact induction that occurs between one surface of an insert holder and a tapered contact portion when pressure is applied while a fastening member is in contact with the contact surface in a cutting tool assembly according to one embodiment of the present invention. [Figure 14] FIG. 14 is a side view schematically illustrating the state of the coupling force generated between one surface of the insert holder and the tapered contact portion when a fastening member is brought into contact with the contact surface and pressurized in a cutting tool assembly according to one embodiment of the present invention. [Figure 15] FIG. 15 is a diagram schematically illustrating, from another direction, a coupling force generated when a fastening member is brought into contact with a contact surface and pressed in a cutting tool assembly according to an embodiment of the present invention. [Figure 16] FIG. 16 is a schematic side view of a cutting tool assembly coupled to a tool post in accordance with an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The advantages and features of the present invention, as well as methods for achieving them, will become clearer with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be realized in various different forms. The present embodiments are provided solely to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art to which the present invention pertains. The present invention is defined solely by the scope of the claims. The same reference symbols throughout the specification refer to the same elements.

[0015] All technical and scientific terms used in this specification are used in the sense that they can be commonly understood by those having ordinary skill in the art to which the present invention belongs. Furthermore, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless they are clearly and specifically defined.

[0016] The terms used in the embodiments of the present invention do not limit the scope of the embodiments of the present invention, but can be used to describe the implementation of the embodiments of the present invention. In addition, the singular form can also include the plural form unless otherwise specified in the text, and unless otherwise specified, the words "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements, steps and / or operations other than the stated elements and / or operations. And "and / or" includes each and every combination of one or more of the stated elements.

[0017] The present invention will now be described with reference to the drawings which illustrate a cutting tool assembly 100 according to an embodiment of the present invention.

[0018] Figure 1 is a schematic assembled perspective view of a cutting tool assembly 100 according to one embodiment of the present invention. Figure 2 is a schematic separated perspective view of the cutting tool assembly 100 according to one embodiment of the present invention. Figure 3 is a separated perspective view of an insert holder 120 and a tool shank 110 in the cutting tool assembly 100 according to one embodiment of the present invention, viewed from another direction. Referring to Figures 1 to 3, the cutting tool assembly 100 according to one embodiment of the present invention may include an insert holder 120, a tool shank 110, and a coupling portion 130 including a coupling protrusion 131, a coupling opening 132, and a fastening member 133 for coupling the insert holder 120 and the tool shank 110 together.

[0019] The insert holder 120 may have inserts 122 of various shapes detachably attached to one surface thereof, and may be detachably attached to a tool shank 110, which will be described later.

[0020] The insert holder 120 may include an insert 122, an insert body 121, and the coupling protrusion 131 of the coupling portion 130.

[0021] The insert body 121 may have an insert attachment / detachment surface to attach and detach the insert 122. In one embodiment of the present invention, the insert body 121 is described as being provided so that the insert 122 can be attached and detached, but the present invention is not limited thereto, and various modifications and alterations are possible, such as the insert 122 and the insert body 121 being integrally formed.

[0022] The coupling protrusion 131 may be provided to protrude from one surface 1211 of the insert body 121. The specific structure, configuration, and shape of the coupling protrusion 131 will be described in detail when describing the coupling with the coupling opening 132 of the tool shank 110.

[0023] The tool shank 110 is configured to have the insert holder 120 detachably fastened to one surface thereof, and the tool shank 110 may be provided with a coupling opening 132, which is one of the components of the coupling portion 130 for inserting the coupling protrusion 131, and may also be configured with a fastening groove 1324 for inserting a fastening member 133, which will be described later.

[0024] The fastening member 133 may be configured to engage with one surface of the coupling protrusion 131 seated in the coupling opening 132 through a fastening groove 1324 formed on at least one surface of the tool shank 110, for example, a side surface of the tool shank 110, and press the coupling protrusion 131. The fastening member 133 may be configured to press the coupling protrusion 131 in the axial direction of the fastening member 133 while being fastened to the fastening groove 1324, thereby tightly coupling the coupling protrusion 131 to the coupling opening 132.

[0025] The fastening member 133 is a fastening device such as a screw, and as the fastening member 133 is rotated, it is moved axially along the thread, and its end can flow into the inside of the coupling opening 132 through the fastening groove 1324, and the end of the fastening member 133 can face the coupling protrusion 131.

[0026] As will be described later, one side of the coupling protrusion 131 may have a flat, planar contact surface 1311a that comes into contact with the fastening member 133, and the other side of the coupling protrusion 131 may have a tapered contact portion 1311b opposite to the contact surface 1311a that can be attached to the coupling opening 132 by being pressed by the fastening member 133.

[0027] Figure 4 is an isolated partial perspective view in one direction that schematically illustrates the connection between the insert holder 120 and the tool shank 110 in a cutting tool assembly 100 according to an embodiment of the present invention. Figure 5 is an isolated partial perspective view in a different direction that schematically illustrates the connection between the insert holder 120 and the tool shank 110 in a cutting tool assembly 100 according to an embodiment of the present invention.

[0028] FIG. 6 is a plan view showing the coupling protrusion 131 formed on one surface 1211 of the insert body 121 in the cutting tool assembly 100 according to one embodiment of the present invention.

[0029] 7A and 7B are side views schematically illustrating the direction of force generation due to fastening and coupling caused by pressure application of a fastening member when a coupling protrusion is inserted into a coupling opening in a cutting tool assembly according to an embodiment of the present invention. FIG. 8 is a perspective view of a portion where a tapered contact portion 1311b is formed in an insert holder 120 in a cutting tool assembly 100 according to an embodiment of the present invention. FIG. 9 is a coupling diagram illustrating a state in which a coupling protrusion 131 is seated in a coupling opening 132 and tightly coupled by the fastening member 133 in a cutting tool assembly 100 according to an embodiment of the present invention.

[0030] 4 to 9 , the coupling protrusion 131 according to an embodiment of the present invention may protrude from one surface 1211 of the insert holder 120, specifically, the insert body 121, and be inserted into the coupling opening 132 of the tool shank 110. The coupling protrusion 131 is configured to couple the insert holder 120 to the tool shank 110. A central axis O of the coupling protrusion 131 according to an embodiment of the present invention may be offset from a central axis Ax of the tool shank 110 in the direction of the contact surface 1311a. Furthermore, the coupling protrusion 131 may be configured to be moved in a predetermined direction by pressure of the fastening member 133 while inserted into the coupling opening 132 of the tool shank 110. Specifically, the coupling protrusion 131 may be moved in a predetermined direction from one side to the other side in the direction of the central axis Ax of the tool shank 110 until a tapered contact portion 1311b of the coupling protrusion 131, which will be described later, contacts an inclined surface 1321a of the coupling opening 132.

[0031] In an embodiment of the present invention, the coupling protrusion 131 may include a support surface portion 1312 , a neck portion 1313 , and a protrusion body 1311 .

[0032] The support surface portion 1312 may have a step and protrude from one surface 1211 of the insert holder 120, specifically, the insert body 121. In the present invention, the support surface portion 1312 may be formed to protrude in a rectangular shape having a predetermined width and thickness from one surface 1211 of the insert holder 120, specifically, the insert body 121. The support surface portion 1312 is seated in a support groove 1322 of the tool shank 110, which will be described later, and may support the insert holder 120 to prevent it from rotating or shifting from the tool shank 110 when the insert 122 is driven for cutting. In addition, the upper and lower peripheral surfaces of the support surface portion 1312 may be formed to a size that fits into the support groove 1322 of the tool shank 110 described later, and the left and right peripheral surfaces of the support surface portion 1312 may be smaller in size than the support groove 1322 of the tool shank 110, and may be provided to be movable at a predetermined interval in the pressure direction when the fastening member 133 presses the coupling protrusion 131.

[0033] The neck portion 1313 may be formed to protrude from the support surface portion 1312 by a predetermined length, and may be formed in a cylindrical shape having a diameter smaller than the size of the support surface portion 1312.

[0034] The protrusion body 1311 extends from the neck portion 1313 and may be formed in a cylindrical shape with a diameter larger than that of the neck portion 1313 around the axis of the neck portion 1313. In this case, one surface of the protrusion body 1311 may form a flat contact surface 1311a that is cut closer to the end of the neck portion 1313 in the axial direction. In one embodiment of the present invention, the contact surface 1311a may be formed on either the left or right side of the insert holder 120. The contact surface 1311a may be formed with a step at the end of the neck portion 1313 close to the central axis O of the coupling protrusion 131 and may form a flat plane that is cut. In addition, a tapered contact portion 1311b may be formed on the surface of the protrusion body 1311 opposite to the surface where the contact surface 1311a is formed. The tapered contact portion 1311b may be formed to protrude obliquely with a predetermined curvature around an end portion of the protrusion body 1311 connected to an end portion of the neck portion 1313. The tapered contact portion 1311b may be configured to contact an inclined surface 1321a of a coupling opening 132, which will be described later. At this time, as shown in FIGS. 7A and 7B , when the coupling protrusion 131 is pressed by the fastening member 133, the tapered contact portion 1311b is fixed while contacting the inclined surface 1321a. At this time, the contact area may be in contact along a 170° to 190° circumferential surface, preferably 180°, from the upper portion to the lower portion of the tapered contact portion 1311b (around the end portion of the upper neck portion 1313) (180° cylinder contact).

[0035] The angle γ of the tapered contact portion 1311b may be configured to have 45±30°, preferably 45±15°, based on the axial direction of the coupling protrusion 131.

[0036] The coupling opening 132 is a groove formed on the inside of the tool shank 110 from one side to the other side of the tool shank 110. The coupling opening 132 may include a support groove 1322, a connection groove 1323, and an insertion groove 1321.

[0037] The support groove 1322 is a groove recessed from one surface of the tool shank 110 corresponding to the support surface portion 1312 so that the support surface portion 1312 is seated and supported. The vertical length of the support groove 1322 may be formed to a size that engages with the peripheral surface of the support surface portion 1312, and the size of one side and the other side of the support groove 1322 may be formed to be larger than the support surface portion 1312 by a distance that the insert holder 120 can move to a position where the tapered contact portion 1311b contacts the inclined surface 1321a when pressed in one direction by the fastening member 133.

[0038] The connecting groove 1323 is connected to the supporting groove 1322 and is a groove into which the neck portion 1313 is inserted and fixed. The connecting groove 1323 may be located between the supporting groove 1322 and an insertion groove 1321, which will be described later. The size of the connecting groove 1323 is smaller than the size of the supporting groove 1322, but may be large enough to allow the coupling protrusion 131 to be inserted therein.

[0039] The insertion groove 1321 may be connected to the connecting groove 1323 and may be formed to extend toward the inside of the tool shank 110. The protrusion body 1311 may be seated in the insertion groove 1321. One side of the insertion groove 1321, specifically, the inner surface of a portion where the fastening groove 1324 is formed, may extend from an end of the connecting groove 1323 to the same size, while the other side of the insertion groove 1321, specifically, the inner surface of a portion where the tapered contact portion 1311b is located may be formed to widen outward from the end of the connecting groove 1323. That is, a portion of the other side of the insertion groove 1321 connected to the end of the connecting groove 1323 may be formed with an inclined surface 1321a inclined to contact the tapered contact portion 1311b, and an end of the inclined surface 1321a may be formed on the inner surface of the insertion groove 1321 parallel to the axial direction.

[0040] When the fastening member 133 engages with the contact surface 1311a through the fastening groove 1324 and is pressed, the coupling protrusion 131 is pressed in the direction in which the fastening member 133 presses, and the tapered contact portion 1311b contacts the inclined surface 1321a, generating a bending force around the contacting portion.

[0041] That is, as shown in FIGS. 7A and 7B, when the insert holder 120 and the tool shank 110 are coupled and driven for cutting, the cutting tool assembly 100 may be subjected to an axial force due to pressure applied during driving, a pressure force perpendicular to the axial direction generated by the fastening member 133 pressing the contact surface 1311a, and an oblique fixing force due to contact between the tapered contact portion 1311b and the inclined surface 1321a.

[0042] 7A and 7B, when the fastening member 133 presses the coupling protrusion 131 through the fastening groove 1324, the tapered contact portion 1311b comes into contact with the inclined surface 1321a. At this time, one surface of the coupling protrusion 131 facing the contact surface 1311a may be spaced a predetermined distance from the inner surface of the insertion groove 1321 and may be out of contact with the contact surface 1311a. Since one surface of the coupling protrusion 131 facing the contact surface 1311a does not come into contact with the inner surface of the insertion groove 1321, a thickness (t) from the circumferential end of the neck portion 1313 to one surface end of the coupling protrusion 131 may be smaller than a thickness (T) between the end (inner peripheral edge of one side) of the connection groove 1323 and the end (inner peripheral edge of one side) of the insertion groove 1321, such that T>t.

[0043] That is, a fixing force is generated in an oblique direction due to the contact between the tapered contact portion 1311b and the inclined surface 1321a and the non-contact between one surface of the coupling protrusion 131 facing the contact surface 1311a and the inner peripheral surface of the insertion groove 1321. A bending force can be generated by the above-mentioned pressing force and axial force together with this fixing force. As a result, coupling reliability can be ensured when the coupling protrusion 131 is coupled by the fastening member 133 in the coupling opening 132.

[0044] 10A to 10C are cross-sectional views schematically illustrating different shapes of the contact surface formed on the coupling protrusion and the tapered contact portion formed on the coupling opening in a cutting tool assembly according to one embodiment of the present invention.

[0045] 1 to 9, the tapered inclined portion of the present invention has been described as being formed in a cylindrical shape with a predetermined curvature, but the shape of the tapered inclined portion is not limited to this.

[0046] For example, as shown in Figures 10A to 10C, the corner regions may have a predetermined curvature, and the portions connecting the corners may be formed in a rectangular shape with straight lines, and the tapered slope portion may be formed to correspond to this rectangular shape.

[0047] Figure 11 is a plan view showing the contact state between the coupling protrusion 131 and the fastening member 133 in the cutting tool assembly 100 according to one embodiment of the present invention. Figure 12 is a rear view showing the contact state between the coupling protrusion 131 and the fastening member 133 in the cutting tool assembly 100 according to one embodiment of the present invention.

[0048] 11 and 12 (also see FIG. 8), according to an embodiment of the present invention, the contact surface 1311a may be formed as a flat surface to be able to contact the end 133a of the fastening member 133, and the end 133a of the fastening member 133 may be formed as a flat surface to be able to contact and adhere to the contact surface 1311a. Here, the contact surface 1311a and the end 133a of the fastening member 133 may not be configured to contact the entire surface when they come into contact, but may be formed at a compound angle so that the contacted portion may contact the rear and bottom surface regions. That is, the contact surface 1311a may be formed as a flat surface inclined at a first angle β with respect to the direction of the central axis O of the coupling protrusion 131 and at a second angle α with respect to a direction perpendicular to the central axis direction, so that an additional bending force may be applied around the contact portion between the tapered contact portion 1311b and the inclined surface 1321a. In the present invention, an example will be described in which the first angle β is formed in a range of 1.5 to 2.5°, preferably 2°, and an example will be described in which the second angle α is formed in a range of 0.5 to 1.5°, preferably 1°. As such, when the contact surface 1311a is coupled to the end of the fastening member 133, it is in contact with the end of the fastening member 133 with a deviation of about 2° in the planar direction and about 1° in the rear direction. Therefore, when the end 133a of the fastening member 133 presses the contact surface 1311a, an additional fastening force can be applied around the contact portion between the tapered contact portion 1311b and the inclined surface 1321a. As a result, the fastening force can be improved and loosening or movement due to driving can be prevented.

[0049] 13 is a schematic side view illustrating the generation of a coupling force due to contact induction generated between one surface of the insert holder 120 and the tapered contact portion 1311b when pressure is applied while the fastening member 133 is in contact with the contact surface 1311a in the cutting tool assembly 100 according to an embodiment of the present invention. FIG. 14 is a schematic view illustrating the state of the coupling force generated between one surface of the insert holder 120 and the tapered contact portion 1311b when pressure is applied while the fastening member 133 is in contact with the contact surface 1311a in the cutting tool assembly 100 according to an embodiment of the present invention. FIG. 15 is a schematic view illustrating the coupling force generated by contact when pressure is applied while the fastening member 133 is in contact with the contact surface 1311a in the cutting tool assembly 100 according to an embodiment of the present invention, viewed from another direction.

[0050] 13 to 15, as described above, when the fastening member 133 presses the coupling protrusion 131 in order to fasten the insert holder 120 to the tool shank 110, the coupling protrusion 131 is pressed by a certain amount in the direction of the central axis Ax of the tool shank 110. Tapered contact part 1311b As the inclined surface 1321a comes into contact with the insert holder 120, specifically one surface 1211 of the insert body 121 and one surface of the tool shank 110 come into contact with each other, the contact area gradually increases.

[0051] Specifically, when the fastening member 133 is engaged with the contact surface 1311a through the fastening groove 1324 and pressed, the one surface 1211 of the insert body 121 moves toward and away from the one surface of the tool shank 110. At this time, the one surface of the tool shank 110 gradually comes into contact with the one surface 1211 of the insert body 121, and then contacts the tapered contact portion 1311b and the support surface portion 1312, thereby widening the contact area and enabling close coupling.

[0052] the above Tapered contact part 1311band the inclined surface 1321a, the coupling protrusion 131 can generate an axial force that fastens in the direction of the tool shank 110. At the same time, a certain distance difference is formed between the contact surface 1311a and the tapered contact portion 1311b, so that a bending force is generated in the coupling protrusion 131, and the contact force between one surface of the insert holder 120 and one surface of the tool shank 110 increases, so that the insert holder 120 and the tool shank 110 can maintain a strong fastening even while the cutting tool assembly 100 performs cutting operation.

[0053] FIG. 16 is a schematic diagram illustrating a cutting tool assembly 100 coupled to a tool post according to one embodiment of the present invention.

[0054] Referring to FIG. 16, the fastening direction of the fastening member 133 that pressurizes the insert holder 120 is configured perpendicular to the direction in which the insert 122 receives the main cutting force. Therefore, when fastening the cutting tool assembly 100 to the tool post 10, there is no interference with the fastening of the insert or the fastening between the insert holder 120 and the tool shank 110. When fastening the cutting tool assembly 100 to the tool post 10, the cutting tool assembly 100, specifically the insert holder 120, can protrude slightly from the tool post 10, thereby reducing vibration during precision cutting.

[0055] Although the present invention has been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the above-described embodiment is illustrative in all respects and is not limiting. [Explanation of symbols]

[0056] 100: Cutting tool assembly 110: Tool shank 120: Insert holder 121: Insert body 1211: One side of the insert body 122: Insert 130: Joint 131: Combination protrusion 1311: Protruding body 1311a: Contact surface 1311b: Tapered contact 1312: Support surface part 1313: Neck 132: Combined aperture 1321: Insertion groove 1321a: Slope 1322: Support groove 1323: Connection groove 1324: Fastening groove 133: Fastening members

Claims

1. a tool shank having a coupling opening; an insert body to which an insert is detachably fastened; an insert holder having a coupling protrusion protruding from one surface of the insert body and detachably coupled to the tool shank; and a fastening member, the coupling protrusion has a tapered contact portion that contacts an inner circumferential surface of the coupling opening to provide a fixing force for fixing the insert holder to the tool shank, and the diameter of the tapered contact portion increases toward the rear end of the coupling protrusion; The coupling protrusion has a contact surface that is positioned away from the tapered contact portion on the opposite side of the insert body, and is engaged with the fastening member. an opposing surface of the coupling protrusion that faces the inner circumferential surface of the coupling opening in a contact direction in which the fastening member contacts the contact surface is spaced a predetermined distance from the inner circumferential surface of the coupling opening and is not in contact with the inner circumferential surface of the coupling opening; the tapered contact portion is located between one surface of the insert body that contacts the tool shank in the axial direction of the coupling projection and the fastening member, When the fastening member presses against the contact surface, a bending force is generated in the coupling projection at a position away from the tapered contact portion on the opposite side from the insert body.

2. The coupling protrusion is a support surface portion protruding in a stepped shape from the one surface of the insert holder; a neck portion protruding from the support surface portion; 2. The cutting tool assembly according to claim 1, further comprising a protrusion body extending from the neck portion, having the contact surface formed on one side thereof, and protruding obliquely from an end of the neck portion on a side opposite the contact surface, and having the tapered contact portion formed thereon.

3. The cutting tool assembly according to claim 2 , wherein the tapered contact portion contacts the inner peripheral surface of the coupling opening along a peripheral surface in a range of 170° to 190° around the end of the neck portion.

4. The coupling opening is a support groove that is inserted from one surface of the tool shank to correspond to the support surface portion and into which the support surface portion is seated and supported; a connecting groove connected to the support groove and into which the neck portion is inserted and fixed; 3. The cutting tool assembly according to claim 2, further comprising an insertion groove connected to the connecting groove on an inner side of the tool shank, in which the protrusion body is seated, and which forms an inclined sloped surface at a portion connected to the connecting groove.

5. The cutting tool assembly according to claim 4 , wherein a fastening groove is formed on a side surface of the tool shank, the fastening groove communicating with one surface of the insertion groove and into which the fastening member is inserted.

6. A cutting tool assembly as described in claim 4, wherein when the coupling protrusion is inserted into the coupling opening, the central axis of the coupling protrusion is offset from the central axis of the tool shank in the direction of the contact surface, and when the fastening member is pressed, the insert holder is moved from the offset position in the direction toward the central axis of the tool shank and attached.

7. 5. The cutting tool assembly according to claim 4, wherein when the fastening member presses the coupling protrusion through the fastening groove and the tapered contact portion contacts the inclined surface, one surface of the coupling protrusion that faces the inner surface of the insertion groove in a contact direction in which the fastening member contacts the contact surface is spaced a predetermined distance from the inner surface of the insertion groove and is out of contact with the inner surface of the insertion groove.

8. 8. The cutting tool assembly according to claim 7, wherein a thickness from a peripheral end of the neck portion to an end of one surface of the coupling projection is smaller than a thickness between an end of the connecting groove and an end of the insertion groove, so that one surface of the coupling projection facing the inner surface of the insertion groove is not in contact with the inner peripheral surface of the insertion groove in a contact direction in which the fastening member contacts the contact surface.

9. The cutting tool assembly according to claim 4 , wherein the angle of the tapered contact portion is configured to have a range of 45±30° with respect to the axial direction of the coupling projection.

10. 10. The cutting tool assembly according to claim 9, wherein when the fastening member is engaged with the contact surface and pressurized, the coupling protrusion is pushed in a pressure direction to generate a bending force, and the tapered contact portion is brought into contact with the inclined surface and is coupled and supported.

11. The cutting tool assembly of claim 10 , wherein the contact surface is stepped at the end of the neck portion to form a flat plane cut closely from a central axis of the coupling projection.

12. The cutting tool assembly according to claim 11 , wherein the contact surface is inclined at a first angle relative to an axial direction of the coupling projection.

13. 13. The cutting tool assembly according to claim 12, wherein the fastening member forms the first angle with the contact surface, and when compressed by the fastening member, contact begins from a rear surface region that is a rear surface of the contact surface in a direction that receives the main cutting of the insert, and when compressed by the fastening member, a bending force is applied to the coupling protrusion.

14. The cutting tool assembly according to claim 11 , wherein the contact surface is formed by a flat plane inclined at a second angle relative to a direction perpendicular to the axial direction of the coupling projection.

15. The cutting tool assembly according to claim 14 , wherein the contact surface is formed at the second angle, and contact is initiated from the contact surface when the fastening member is pressed, and movement of the coupling protrusion is restricted while in contact.

16. an insert body mounted on the front surface of the tool shank and to which the insert is removably fastened; a coupling protrusion that protrudes from one surface of the insert body, is detachably coupled to the tool shank, and provides a fixing force for fixing to the tool shank, the coupling protrusion having a tapered contact portion whose diameter increases toward a rear end, and a contact surface that comes into close contact with a fastening member that is fastened in a direction toward a central axis of the tool shank at a position away from the tapered contact portion on the opposite side of the insert body, the tapered contact portion is located between one surface of the insert body that contacts the tool shank and a contact surface that contacts the fastening member in an axial direction of the coupling projection, When the fastening member presses the contact surface, a bending force is generated in the coupling protrusion at a position away from the tapered contact portion on the opposite side of the insert body, The contact surface is formed as a flat surface inclined at a second angle with respect to a direction perpendicular to the axial direction of the coupling protrusion, The insert holder forms the second angle on the contact surface, and contact begins from the contact surface when the fastening member is pressed, and restricts movement of the coupling protrusion while in contact.

17. The insert holder according to claim 16, wherein the angle of the tapered contact portion is configured to be in the range of 45±30° with respect to the axial direction of the coupling projection.

18. The contact surface is inclined at a first angle with respect to an axial direction of the coupling protrusion, The insert holder of claim 16, wherein the fastening member forms the first angle with the contact surface, contacting the contact surface from a rear surface region that is a rear surface of the contact surface in a direction that receives the main cutting of the insert, and is compressed while applying a bending force to the coupling protrusion by compressing the fastening member.

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