Insert holder and cutting tool assembly comprising the same

Abstract

A cutting tool assembly is provided, including a tool shank including a connection opening, and a blade holder including a blade main body and a connection protrusion, the blade being connected and detachably attached to the blade main body, the connection protrusion protruding from one surface of the blade main body and being detachably connected to the tool shank, wherein a tapered contact portion in contact with the connection opening and providing a fixing force to fix the blade holder to the tool shank, and a contact surface located at a rear end of the tapered contact portion and connected to a fastening member are located on the connection protrusion.

Description

TECHNICAL FIELD

[0001] The present invention relates to a blade holder and a cutting tool assembly including the same, and in particular, to a cutting tool assembly configured to secure a connection force between a tool shank and a blade holder that is replaceably connected to the tool shank and to which a blade is connected, and to secure a connection reliability when in operation. BACKGROUND

[0002] A tool connector configured to reliably join a first component to a second component can be provided in a cutting tool. In some such cutting tools, the tool connector can be a threaded type connector.

[0003] Examples of such cutting tools are disclosed in U.S. Patent No. 6,582,164, U.S. Patent No. 7,713,004, and U.S. Patent Application No. 2012 / 0009027.

[0004] In other cutting tools, the tool connector provides a differential device that reliably fastens the first component and the second component together. Examples of such cutting tools are disclosed in U.K. Patent No. 765943, U.S. Patent No. 4,930,956, and U.S. Patent Application No. 4,557,642.

[0005] In other cutting tools, the tool connector can generally include a stop surface that extends in a radial direction. Examples of such cutting tools are disclosed in U.S. Patent No. 6,506,003 and U.S. Patent No. 5,988,953. SUMMARY

[0006] TECHNICAL PROBLEM

[0007] Aspects of the present invention provide a blade holder, and a cutting tool assembly including the same, the blade holder including various shapes of blades is mounted on the cutting tool assembly using one tool shank, and the cutting tool assembly is configured to easily assemble / disassemble a head module and the tool shank.

[0008] Aspects of the present invention also provide a blade holder, and a cutting tool assembly including the same, the cutting tool assembly is configured to secure a reliability of a connection between the blade holder and the tool shank, and to maintain the reliability of the connection between the blade holder and the tool shank when the cutting tool performs a cutting operation.

[0009] It should be noted that the objects of the present invention are not limited to the above-mentioned objects, and other objects of the present invention will be understood by those skilled in the art from the following description.

[0010] SOLUTION TO PROBLEM

[0011] To achieve the above object, a cutting tool assembly includes a tool shank including a connection opening, and an insert holder including an insert body to which an insert is connected and detachably attached, and a connection protrusion protruding from one surface of the insert body and detachably connected to the tool shank, wherein a tapered contact portion in contact with the connection opening and providing a fixing force to fix the insert holder to the tool shank, and a contact surface located at a rear end of the tapered contact portion and connected to a fastening member are located on the connection protrusion.

[0012] Advantages of the Invention

[0013] In the insert holder according to the exemplary embodiment of the present application and the cutting tool assembly including the same, since the insert holder is detachably provided on the tool shank, the insert holder including various shapes of inserts can be replaceably provided on the tool shank.

[0014] In addition, in the insert holder according to the exemplary embodiment of the present application and the cutting tool assembly including the same, since a plurality of insert shapes can be used when only the insert holder is replaced, replacement time can be reduced, and replacement can be easily performed, thereby improving productivity due to the reduction of replacement time and easy replacement.

[0015] In addition, in the insert holder according to the exemplary embodiment of the present application and the cutting tool assembly including the same, since the tapered contact portion having a circumferential shape is formed on the connection protrusion of the insert holder to which the tool shank is directed as a surface opposite to the contact surface of the fastening member, the tapered contact portion is held and mounted on the inner connection surface of the tool shank by a bending force caused by the pressure of the fastening member, and is in contact with and connected to the inner connection surface of the tool shank, thereby ensuring the reliability of connection between the insert holder and the tool shank, and ensuring the reliability of connection between the insert holder and the tool shank when the cutting tool is operated. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic perspective view of a cutting tool assembly according to some exemplary embodiments of the present application.

[0017] Figure 2 is a schematic perspective view of a cutting tool assembly according to some exemplary embodiments of the present application.

[0018] Figure 3 is a perspective view showing that an insert holder and a tool shank are separated when viewed in different directions, of a cutting tool assembly according to some exemplary embodiments of the present application.

[0019] Figure 4 is a partially separated perspective view schematically showing a connection between a blade holder and a tool shank in a cutting tool assembly according to some example embodiments of the present application.

[0020] Figure 5 is a partially separated perspective view schematically showing a connection between a blade holder and a tool shank in a cutting tool assembly according to some example embodiments of the present application.

[0021] Figure 6 is a plan view showing a connection protrusion formed on one surface of a blade body in a cutting tool assembly according to some example embodiments of the present application.

[0022] Figure 7A and Figure 7B is a view schematically showing a direction of a force caused by a fixing and connecting due to a pressure of a fastening member when the connection protrusion is inserted into the connection opening in a cutting tool assembly according to some example embodiments of the present application.

[0023] Figure 8 is a perspective view showing a part of a blade holder formed with a tapered contact portion in a cutting tool assembly according to some example embodiments of the present application.

[0024] Figure 9 is a connection view showing a state in which the connection protrusion is installed on the connection opening by the fastening member, and then is pressed against the connection opening, and is connected to the connection opening in a cutting tool assembly according to some example embodiments of the present application.

[0025] Figures 10A to 10C is a view schematically showing different shapes of a contact surface formed on the connection protrusion and a tapered contact portion formed in the connection opening in a cutting tool assembly according to some example embodiments of the present application.

[0026] Figure 11 is a plan view showing a contact state between the connection protrusion 131 and the fastening member in a cutting tool assembly according to some example embodiments of the present application.

[0027] Figure 12 is a rear view showing a contact state between the connection protrusion and the fastening member in a cutting tool assembly according to some example embodiments of the present application.

[0028] Figure 13 is a view schematically showing an occurrence of a connection force caused by a contact between one surface of the blade holder and the tapered contact portion in a cutting tool assembly according to some example embodiments of the present application when the fastening member is in contact with the contact surface, and is pressed against the contact surface.

[0029] Figure 14 FIG. 7 is a view schematically showing a state of a connection force generated between one surface of the insert holder and the tapered contact portion when the fastening member is in contact with and pressed against the contact surface in the cutting tool assembly according to some exemplary embodiments of the present application.

[0030] Figure 15 FIG. 8 is a view schematically showing a state of a connection force generated by contact when the fastening member is in contact with and pressed against the contact surface when viewed in different directions in the cutting tool assembly according to some exemplary embodiments of the present application.

[0031] Figure 16 FIG. 9 is a view schematically showing a state in which the cutting tool assembly according to some exemplary embodiments of the present application is connected to a tool holder. DETAILED DESCRIPTION

[0032] Advantages and features of the present application, and methods of accomplishing the same, can be understood more readily by reference to the following detailed description of exemplary embodiments and the accompanying drawings. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the application to those skilled in the art, and the present application will only be limited by the scope of the claims. In the drawings, like reference numerals refer to like elements throughout.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0034] In the following description of the present application, terms used are used to explain example embodiments of the present application, but do not limit the scope of the present application. In the specification, unless specifically described otherwise, singular expressions can include plural expressions. The terms "comprises" and / or "comprising," as used in the specification, mean that the described components, steps, operations, and / or elements are not excluded or added, but one or more other components, steps, operations, and / or elements can be present or added. In addition, the term "and / or" includes each of the above and all combinations of one or more of the above.

[0035] Hereinafter, a cutting tool assembly 100 according to some exemplary embodiments of the present application will be described with reference to the accompanying drawings.

[0036] Figure 1 is a schematic perspective view of a cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 2 is a schematic perspective view of a cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 3 is a perspective view illustrating a cutting tool assembly 100 according to some exemplary embodiments of the present application, in which a blade holder 120 and a tool shank 110 are separated when viewed in different directions.

[0037] Referring to Figures 1 to 3 , a cutting tool assembly 100 according to some exemplary embodiments of the present application can include a blade holder 120 and a tool shank 110, a connecting portion 130 including a connecting protrusion 131 configured to connect the blade holder 120 and the tool shank 110 together, a connecting opening 132, and a fastening member 133.

[0038] The blade holder 120 can be configured to detachably connect a blade 122 having various shapes to one surface thereof, and to be attachable to or detachable from the tool shank 110, which will be described hereinafter.

[0039] The blade holder 120 can include the blade 122, a blade body 121, and the connecting protrusion 131 of the connecting portion 130.

[0040] The blade body 121 can include a blade detachment surface to which the blade 122 is attached or detached. In some exemplary embodiments of the present application, the blade body 121 is exemplified as being configured to allow the blade 122 to be attached thereto or detached therefrom, but is not limited thereto. The blade 122 and the blade body 121 can be integrally formed, or can be variously modified or changed.

[0041] The connecting protrusion 131 can be configured to protrude from one surface 1211 of the blade body 121. When describing the connection between the connecting protrusion 131 and the connecting opening 132 of the tool shank 110, the detailed structure, configuration, and shape of the connecting protrusion 131 will be described in detail.

[0042] The tool shank 110 is configured to allow the blade holder 120 to be attachable to or detachable from one surface thereof. The tool shank 110 can include the connecting opening 132 of the connecting portion 130 of the component for inserting the connecting protrusion 131, and the tool shank 110 can include a fastening recess 1324 into which the fastening member 133, which will be described hereinafter, is inserted.

[0043] The fastening member 133 can be configured to pass through the fastening groove 1324 formed in at least one surface of the tool shank 110, for example, a side surface of the tool shank 110, to engage one surface of the connection protrusion 131 installed on the connection opening 132, and to pressurize the connection protrusion 131. While the fastening member 133 is fastened to the fastening groove 1324, the fastening member 133 can be configured to push the connection protrusion 131 in the axial direction of the fastening member 133 to allow the connection protrusion 131 to be pressed against and connected to the connection opening 132.

[0044] When the fastening member 133, such as a screw, as a fastening device, moves in the axial direction along the thread by rotation of the fastening member 133, the end portion of the fastening member 133 can move into the connection opening 132 through the fastening groove 1324 and can face the connection protrusion 131.

[0045] As described below, a contact surface 1311a in contact with the fastening member 133 can be provided in a planar shape on one surface of the connection protrusion 131. A tapered contact portion 1311b, which can be held by the connection opening 132, in contact with the connection opening 132, and connected to the connection opening 132 by the pressure of the fastening member 133, can be formed on the opposite surface of the contact surface 1311a as another surface of the connection protrusion 131.

[0046] Figure 4 is a partially one-directional separated perspective view schematically showing the connection between the insert holder 120 and the tool shank 110 in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0047] Figure 5 is a partially another-directional separated perspective view schematically showing the connection between the insert holder 120 and the tool shank 110 in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0048] Figure 6 is a plan view showing the connection protrusion 131 formed on one surface 1211 of the insert body 121 in the cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 7A and Figure 7B is a view schematically showing the direction of force generated by being fixed and connected according to the pressure of the fastening member when the connection protrusion is inserted into the connection opening in the cutting tool assembly according to some exemplary embodiments of the present application. Figure 8 is a perspective view showing a portion of the insert holder 120 formed with the tapered contact portion 1311b in the cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 9is a connection view showing a state in which the connection protrusion 131 is installed on the connection opening 132 by the fastening member 133, and then is pressed against the connection opening 132, and is connected to the connection opening 132, in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0049] Referring to Figures 4 to 9 The connection protrusion 131 according to some exemplary embodiments of the present application can be configured to protrude from the insert holder 120, in detail, from one surface 1211 of the insert body 121, and to be inserted into the connection opening 132 of the tool shank 110. The connection protrusion 131 is a component configured to connect the insert holder 120 to the tool shank 110. A central axis O of the connection protrusion 131 according to some exemplary embodiments of the present application can be spaced apart from a central axis Ax of the tool shank 110 toward a contact surface 1311a, thereby forming an offset. In addition, the connection protrusion 131 can be configured to move in one direction by pressure of the fastening member 133 when inserted into the connection opening 132 of the tool shank 110. In detail, the connection protrusion 131 can be configured to move from one side to the other side until a tapered contact portion 1311b (to be described below) of the connection protrusion 131 contacts an inclined surface 1321a of the connection opening 132 toward the central axis Ax of the tool shank 110.

[0050] In some exemplary embodiments of the present application, the connection protrusion 131 can include a support surface portion 1312, a neck portion 1313, and a protrusion body 1311.

[0051] The support surface portion 1312 can be steppedly protruded from the insert holder 120, in detail, from one surface 1211 of the insert body 121. In the present application, the support surface portion 1312 can be described as, for example, a quadrangle having a certain width and thickness protruding from the insert holder 120, in detail, from one surface 1211 of the insert body 121. The support surface portion 1312 can be installed on the support groove 1322 of the tool shank 110 so as to support and restrict the rotation of the insert holder 120 on the tool shank 110, or to support and restrict the positional deviation of the insert holder 120 when the insert 122 is driven to cut. In addition, the upper and lower circumferential surfaces of the circumferential surface of the support surface portion 1312 can be formed to have a size adapted to that of the support groove 1322 of the tool shank 110. The left and right circumferential surfaces of the circumferential surface of the support surface portion 1312 have a size smaller than the support groove 1322 of the tool shank 110, so that the support surface portion 1312 is movable by a certain distance in a direction in which the fastening member 133 exerts pressure on the connection protrusion 131.

[0052] The neck portion 1313 can protrude from the support surface portion 1312 by a certain length, and can have a cylindrical shape having a diameter smaller than the size of the support surface portion 1312.

[0053] The protrusion body 1311 can extend from the neck portion 1313, and can have a cylindrical shape having a diameter larger than that of the neck portion 1313 based on the axis of the neck portion 1313. Here, one surface of the protrusion body 1311 can form a contact surface 1311a which is flat as if cut closer to the axis than the end of the neck portion 1313. In some exemplary embodiments of the present application, the contact surface 1311a can be formed as one of the left and right side surfaces of the blade holder 120. The contact surface 1311a can be formed on the end of the neck portion 1313 in a stepped manner to be close to the central axis O of the connection protrusion 131, thereby forming a flat surface as if cut. In addition, a tapered contact portion 1311b can be formed on a surface opposite to the surface of the protrusion body 1311 on which the contact surface 1311a is formed. The tapered contact portion 1311b can protrude as a taper having a certain curvature along the peripheral surface of the end portion of the protrusion body 1311 connected to the end of the neck portion 1313. The tapered contact portion 1311b can be configured to be in contact with the inclined surface 1321a of the connection opening 132 to be described below. Here, as shown in FIG. 13B, when the connection protrusion 131 is pressed by the fastening member 133, the tapered contact portion 1311b is in contact with and fixed to the inclined surface 1321a. Here, the contact area can be an area of the tapered contact portion 1311b of a circumferential surface of 170° to 190°, and preferably 180°, from the upper portion thereof to the lower portion thereof in contact (in 180° cylindrical contact) with the periphery of the end of the neck portion 1313. Figure 7A and Figure 7B As shown in FIG. 13B, when the connection protrusion 131 is pressed by the fastening member 133, the tapered contact portion 1311b is in contact with and fixed to the inclined surface 1321a. Here, the contact area can be an area of the tapered contact portion 1311b of a circumferential surface of 170° to 190°, and preferably 180°, from the upper portion thereof to the lower portion thereof in contact (in 180° cylindrical contact) with the periphery of the end of the neck portion 1313.

[0054] The angle γ of the tapered contact portion 1311b can be in the range of 45±30°, and preferably in the range of 45±15°, based on the axial direction of the connection protrusion 131.

[0055] The connection opening 132 is a recess formed in the tool handle 110 from one side to the other side of the tool handle 110. The connection opening 132 can include a support recess 1322, a connection recess 1323, and an insertion recess 1321.

[0056] The support groove 1322 is a groove recessed from one surface of the tool shank 110 corresponding to the support surface portion 1312 to allow the installation and support of the support surface portion 1312. The vertical length of the support groove 1322 can be formed to have a size suitable for the circumferential surface of the support surface portion 1312. The size of one side and the other side of the support groove 1322 can be formed to be larger than the movable distance of the blade holder 120 to the position where the tapered contact portion 1311b is in contact with the inclined surface 1321a when pressed in one direction by the fastening member 133.

[0057] The connection groove 1323 is a groove connected to the support groove 1322 and in which the neck portion 1313 is embedded and installed. The connection groove 1323 can be located between the support groove 1322 and the insertion groove 1321 to be described below. The size of the connection groove 1323 can be a size in which the connection protrusion 131 can be embedded, while being smaller than the size of the support groove 1322.

[0058] The insertion groove 1321 can be connected to the connection groove 1323 and extend toward the inside of the tool shank 110. The protrusion body 1311 can be installed in the insertion groove 1321. One side of the insertion groove 1321, in detail, an inner surface of a portion in which the fastening groove 1324 is formed, extends from the end of the connection groove 1323 in the same size. Here, the other side of the insertion groove 1321, in detail, an inner surface of a portion in which the tapered contact portion 1311b is formed, can be widened outward from the end of the connection groove 1323. That is, the tapered inclined surface 1321a can be formed at a portion on the other side of the insertion groove 1321 connected to the end of the connection groove 1323 to be in contact with the tapered contact portion 1311b, and the tapered inclined surface 1321a can be formed on the inner surface of the insertion groove 1321 parallel to the axial direction at the end of the inclined surface 1321a.

[0059] When the fastening member 133 is engaged with the contact surface 1311a and pressed against the contact surface 1311a through the fastening groove 1324, the connection protrusion 131 is pushed in the direction in which the fastening member 133 is pressed, and the tapered contact portion 1311b is in contact with the inclined surface 1321a, so that a bending force can be generated around the contact portion.

[0060] That is, as Figure 7A and Figure 7BAs shown, when a cutting operation is performed while the insert holder 120 and the tool shank 110 are connected together, an axial force caused by pressure, a pressure generated when the fastening member 133 presses the abutment surface 1311a, and a diagonal fixing force caused by the contact between the tapered contact portion 1311b and the inclined surface 1321a can be generated when the cutting tool assembly 100 is operated.

[0061] In addition, as shown in Figure 7A and Figure 7B When the fastening member 133 presses the connection protrusion 131 through the fastening groove 1324, the tapered contact portion 1311b comes into contact with the inclined surface 1321a. Here, one surface of the connection protrusion 131 facing the contact surface 1311a can be spaced apart from the inner surface of the insertion groove 1321 by a certain distance and not in contact with the inner surface. In order to allow one surface of the connection protrusion 131 facing the contact surface 1311a not to be in contact with the inner surface of the insertion groove 1321, the thickness t from the circumferential end of the neck portion 1313 to the end of the one surface of the connection protrusion 131 can be less than the thickness T (T > t) between the end of the connection groove 1323 (one inner circumference) and the end of the insertion groove 1321 (one inner circumference).

[0062] That is, due to the contact between the tapered contact portion 1311b and the inclined surface 1321a and the non-contact between one surface of the connection protrusion 131 facing the contact surface 1311a and the inner surface of the insertion groove 1321, a fixing force in the diagonal direction is generated, so that a bending force can be generated by the fixing force, the pressure described above, and the axial force. Accordingly, when the connection protrusion 131 is connected to the connection opening 132 by the fastening member 133, connection reliability can be ensured.

[0063] Figures 10A to 10C are views schematically showing different shapes of a contact surface formed on a connection protrusion and a tapered contact portion formed in a connection opening in a cutting tool assembly according to some exemplary embodiments of the present application.

[0064] First, in Figures 1 to 9 , it is described as an example that the cylindrical shape of the tapered inclined portion has a certain curvature. However, the shape of the tapered inclined portion is not limited thereto.

[0065] For example, as shown in Figures 10A to 10C , the corner region has a certain curvature, and the portions connected to the respective corners have a linear quadrangular shape, so that the tapered inclined portion can be formed in a shape corresponding to the quadrangular shape.

[0066] Figure 11is a plan view illustrating a contact state between the connecting protrusion 131 and the fastening member 133 in the cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 12 is a rear view illustrating a contact state between the connecting protrusion 131 and the fastening member 133 in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0067] Referring to Figure 11 and Figure 12 (also referring to Figure 8 ), the contact surface 1311a according to some exemplary embodiments of the present application can be formed as a flat surface to be in contact with the end portion 133a of the fastening member 133, and the end portion 133a of the fastening member 133 can be formed as a flat surface to be in contact with the contact surface 1311a and to be pressed against the contact surface 1311a. Here, when the contact surface 1311a is in contact with the end portion 133a of the fastening member 133, the contact surface 1311a can be configured such that not all of the surface is in contact therewith, and can have an angular offset at a certain angle to allow a contact portion to be in contact with a rear surface and a lower area. That is, the contact surface 1311a can be formed as a flat surface to be inclined at a first angle β based on a direction toward a central axis O of the connecting protrusion 131, and to be inclined at a second angle α based on a direction perpendicular to the direction toward the central axis, and the contact surface 1311a can be configured to provide an additional bending force around a contact portion between the tapered contact portion 1311b and the inclined surface 1321a. In the present application, it can be described as an example that the first angle β is formed as 1.5° to 2.5°, preferably 2°, and the second angle α is formed as 0.5° to 1.5°, preferably 1°. As described above, in the case where the contact surface 1311a is offset by 2° in a planar direction, and by 1° in a rearward direction, when the end portion 133a of the fastening member 133 presses the contact surface 1311a, an additional bending force can be provided around the contact portion between the tapered contact portion 1311b and the inclined surface 1321a when the end portion 133a of the fastening member 133 presses the contact surface 1311a, thereby enabling an increase in fastening force and preventing release or movement caused by operation.

[0068] Figure 13 is a view schematically illustrating generation of a connecting force caused by contact between one surface of the insert holder 120 and the tapered contact portion 1311b when the fastening member 133 is in contact with and pressed against the contact surface 1311a in the cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 14is a view schematically showing a state of a connection force generated between one surface of the insert holder 120 and the tapered contact portion 1311b when the fastening member 133 is in contact with the contact surface 1311a and pressed against the contact surface 1311a in the cutting tool assembly 100 according to some exemplary embodiments of the present application. Figure 15 is a view schematically showing a state of a connection force generated between one surface of the insert holder 120 and the tapered contact portion 1311b when the fastening member 133 is in contact with the contact surface 1311a and pressed against the contact surface 1311a in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0069] Reference Figures 13 to 15 As described above, when the fastening member 133 presses the connection protrusion 131 to fasten the insert holder 120 to the tool shank 110, the connection protrusion 131 is pushed in a direction toward the central axis Ax of the tool shank 110 by a certain amount, and the tapered contact surface 1311a having a circumferential shape comes into contact with the inclined surface 1321a while the contact area gradually increases. Here, as one surface 1211 of the insert body 121 comes into contact with one surface of the tool shank 110 while the contact area gradually increases, the insert holder 120, in detail.

[0070] In detail, when the fastening member 133 engages with the contact surface 1311a by passing through the fastening groove 1324 and is pressed by the contact surface 1311a, one surface 1211 of the insert body 121 is hinged on one surface of the tool shank 110. Here, one surface of the tool shank 110 can gradually come into contact with one surface 1211 of the insert body 121, and can sequentially come into contact with the tapered contact portion 1311b and the support surface portion 1312, thereby being pressed and connected to the tapered contact portion 1311b and the support surface portion 1312 as the contact area increases.

[0071] By the contact between the inclined surface 1321a and the tapered contact surface 1311a having a circumferential shape, an axial force fastening the connection protrusion 131 to the tool shank 110 can be generated. In addition, since a certain distance difference is formed between the contact surface 1311a and the tapered contact portion 1311b, a bending force is generated at the connection 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 be firmly fastened to each other even when the cutting tool assembly 100 performs a cutting operation.

[0072] Figure 16 is a view schematically showing a state of a connection force generated between one surface of the insert holder 120 and the tapered contact portion 1311b when the fastening member 133 is in contact with the contact surface 1311a and pressed against the contact surface 1311a in the cutting tool assembly 100 according to some exemplary embodiments of the present application.

[0073] Reference Figure 16 Since the fastening member 133 pressurizing the insert holder 120 is fastened in a direction perpendicular to the direction of the main cutting force received by the insert 122, the fastening of the insert or the fastening between the insert holder 120 and the tool shank 110 can not be disturbed when the cutting tool assembly 100 is fastened to the tool holder 10. When the cutting tool assembly 100 is fastened to the tool holder 10, the cutting tool assembly 100, in detail, the insert holder 120, can be slightly protruded from the tool holder 10, thereby being able to reduce vibration when performing a precise cutting operation.

[0074] Embodiments of the present application have been described above with reference to the accompanying drawings, but it will be understood by those of ordinary skill in the art to which the present application pertains that the present application can be practiced in other specific forms without changing the technical idea or essential characteristics thereof. Therefore, the above-described embodiments are illustrative in all aspects and should not be construed as limiting.

Claims

1. A cutting tool assembly, comprising: Tool handle, including connection opening; as well as A blade holder includes a blade body and a connecting protrusion, the blade being connected to and detachably attached to the blade body, the connecting protrusion projecting from one surface of the blade body and detachably connected to the tool shank, wherein the connecting protrusion includes: The central axis (O) defines the forward to backward direction. At the front end, the connecting protrusion is attached to the blade body, and the connecting protrusion protrudes rearward from one surface of the blade body. The rear end faces the tool handle in a rearward direction. The tapered contact portion, which contacts the connection opening and provides a retaining force to secure the blade holder to the tool handle, and the contact surface, which is located at the rear end of the tapered contact portion along the central axis (O) of the connection protrusion and connected to the fastening member, are located on the connection protrusion.

2. The cutting tool assembly according to claim 1, wherein, The connecting protrusion includes: The support surface portion protrudes in a stepped manner from one surface of the blade holder; The neck portion protrudes from the supporting surface portion; and A protruding body extends from the neck portion and has one surface and another surface, the contact surface being formed on the one surface of the protruding body, and a tapered contact portion protruding from the end of the neck portion being formed on the other surface.

3. The cutting tool assembly according to claim 2, wherein, The tapered contact portion contacts the connection opening along a circumferential surface from the upper to the lower part of the neck portion at a range of 170° to 190°.

4. The cutting tool assembly according to claim 2, wherein, The connection opening includes: A support groove is recessed from one surface of the tool handle, the support groove corresponding to a portion of the support surface, and the support surface portion is mounted on the support groove to obtain support; A connecting groove is provided, which connects to the supporting groove, and the neck portion is inserted into and mounted on the connecting groove; and An insertion groove is provided, which is connected to the inner side of the tool handle in the connecting groove. The protruding body is mounted in the insertion groove, and the insertion groove includes a tapered inclined surface as a portion connected to the connecting groove.

5. The cutting tool assembly according to claim 4, wherein, A fastening groove is formed in the side surface of the tool handle, the fastening groove is configured to communicate with one surface of the insertion groove, and the fastening member is inserted into the fastening groove.

6. The cutting tool assembly according to claim 4, wherein, The center of the connecting protrusion is mounted on the center of the connecting opening of the tool handle, and the center of the connecting protrusion is offset in the direction toward the contact surface.

7. The cutting tool assembly according to claim 4, wherein, When the fastening member applies pressure to the connecting protrusion through the fastening groove, such that the tapered contact portion contacts the tapered inclined surface, one surface of the connecting protrusion facing the contact surface is spaced apart from the inner surface of the insertion groove and does not contact the inner surface of the insertion groove.

8. The cutting tool assembly according to claim 7, wherein, To prevent the inner surface of the insertion groove and the one surface of the connecting protrusion facing the contact surface from contacting each other, the thickness from the circumferential end of the neck portion to the end of the one surface of the connecting protrusion is less than the thickness between the end of the connecting groove and the end of the insertion groove.

9. The cutting tool assembly according to claim 4, wherein, Based on the axial direction of the connecting protrusion, the angle of the tapered contact portion is formed within the range of 45°±30°.

10. The cutting tool assembly according to claim 9, wherein, When the fastening member engages with and presses against the contact surface, the connecting protrusion is pushed in the pressing direction to generate a bending force, and the tapered contact portion contacts and connects to the tapered inclined surface to obtain support.

11. The cutting tool assembly of claim 10, wherein, The contact surface is formed into a flat surface that is stepped off the end of the neck portion and closer to the central axis of the connecting protrusion.

12. The cutting tool assembly of claim 11, wherein, Based on the axial direction of the connecting protrusion, the contact surface is configured to be inclined at a first angle.

13. The cutting tool assembly of claim 12, wherein, The first angle is formed to the contact surface, and a bending force is provided to pressurize it when it begins to contact the rear region of the contact surface according to the pressure of the fastening member.

14. The cutting tool assembly of claim 11, wherein, Based on a direction perpendicular to the axial direction of the connecting protrusion, the contact surface is formed as a flat surface inclined at a second angle.

15. The cutting tool assembly of claim 14, wherein the second angle is formed to the contact surface and contacts the lower region of the contact surface under pressure from the fastening member to restrict vertical movement of the connecting protrusion.

16. A blade holder, comprising: The blade body is mounted on the front surface of the tool shank, and the blade is detachably fastened to the blade body; as well as A connecting protrusion, projecting from one surface of the blade body, includes a tapered contact portion and a contact surface. The tapered contact portion is detachably connected to the tool shank and configured to provide a retaining force for securing to the tool shank. The contact surface is in close contact with a fastening member fastened to the rear end of the tapered contact portion in a direction other than that of the tool shank. The connecting protrusion includes: The central axis (O) defines the forward to backward direction. At the front end, the connecting protrusion is attached to the blade body, and the connecting protrusion protrudes rearward from one surface of the blade body. The rear end faces the tool handle in a backward direction.

17. The blade holder according to claim 16, wherein, Based on the axial direction of the connecting protrusion, the angle of the tapered contact portion is formed within the range of 45°±30°.

18. The blade holder according to claim 16, wherein, Based on the axial direction of the connecting protrusion, the contact surface is configured to be inclined at a first angle, and The first angle is formed on the contact surface and provides a bending force to pressurize when it begins to contact the rear region of the contact surface in accordance with the pressure of the fastening member.

19. The blade holder according to claim 16, wherein, Based on a direction perpendicular to the axial direction of the connecting protrusion, the contact surface is formed as a flat surface inclined at a second angle, and The second angle is formed on the contact surface, and the vertical movement of the connecting protrusion is restricted when the connecting protrusion contacts the lower region of the contact surface under the pressure of the fastening member.

Images