Taper sleeve, cutter handle assembly and cutter clamping method for cutter handle assembly

Abstract

The invention discloses a taper sleeve, a cutter handle assembly and a cutter clamping method for the cutter handle assembly, the taper sleeve comprises a first part, a second part and a third part, in the axial direction of the taper sleeve, the second part is connected between the first part and the third part, and the third part is connected between the first part and the third part. The first part and the third part are suitable for generating elastic deformation in the radial direction of the taper sleeve so as to clamp or loosen a cutter; the second part is configured to elastically deform in the axial direction of the taper sleeve when one of the first part and the third part abuts against the inner wall of the taper hole so as to apply elastic force to the other one of the first part and the third part in the axial direction of the taper sleeve. And the other one of the first part and the third part is pressed against the inner wall of the conical hole. According to the taper sleeve, double-end synchronous centering of the taper sleeve can be achieved, and then the axis of a cutter is prevented from inclining.

Description

Technical Field

[0001] The present application relates to the technical field of cutting tools, and particularly to a taper sleeve, a tool holder assembly, and a tool clamping method for the tool holder assembly. Background Art

[0002] In the technical field of cutting tools, the clamping stability of cylindrical shank cutting tools directly affects the machining accuracy and efficiency. Traditional tool holders (such as ER collet chucks) mostly adopt a clamping structure of a tool holder and a taper sleeve. The tool holder is provided with a tapered hole, and the taper sleeve is inserted into the tapered hole, and the axial displacement of the taper sleeve forces the taper sleeve to radially contract to clamp the cutting tool. However, such a structure has the following defects: low centering accuracy: affected by manufacturing errors, and the fit between the taper sleeve and the inner wall of the tapered hole of the tool holder usually only ensures contact at one end of the taper sleeve, but there is a gap at the other end, resulting in the skew of the tool axis, difficult to control the runout accuracy, and unable to evenly transmit the clamping force. During the machining process, the cutting tool is likely to loosen due to vibration or cutting force fluctuation, resulting in insufficient clamping rigidity. Summary of the Invention

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides a taper sleeve, a tool holder assembly, and a tool clamping method for the tool holder assembly.

[0004] In a first aspect, the present application provides a taper sleeve.

[0005] The taper sleeve according to the embodiment of the present application is adapted to be sleeved on a cutting tool and inserted into a tapered hole of a tool holder. The taper sleeve includes: a first part, a second part, and a third part. In the axial direction of the taper sleeve, the second part is connected between the first part and the third part. The first part and the third part are both adapted to elastically deform in the radial direction of the taper sleeve to clamp or release the cutting tool. The second part is configured to elastically deform in the axial direction of the taper sleeve to apply an elastic force in the axial direction of the taper sleeve to the other of the first part and the third part when one of the first part and the third part abuts against the inner wall of the tapered hole, so that the other of the first part and the third part abuts against the inner wall of the tapered hole.

[0006] According to the collet of the embodiment of the present application, by providing a second part between the first part and the third part that can elastically deform in the axial direction of the collet, when one of the first part and the third part abuts against the inner wall of the tapered hole to clamp the tool, the second part can elastically deform in the axial direction of the collet to apply an elastic force in the axial direction of the collet to the other of the first part and the third part, so that the other of the first part and the third part abuts against the inner wall of the tapered hole. In this way, both the first part and the third part can abut against the inner wall of the tapered hole to clamp the tool simultaneously, that is, both ends of the collet can clamp the tool, thereby realizing double-end synchronous centering of the collet, further avoiding the skew of the tool axis, making it easier to control the runout accuracy of the tool, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0007] According to the collet of some embodiments of the present application, the second part is configured as a cylindrical structure, and the cylindrical structure communicates between the first part and the third part, wherein the cylindrical structure is provided with a deformation seam, and the deformation seam is arranged between the two ends in the axial direction of the cylindrical structure.

[0008] According to the collet of some embodiments of the present application, the deformation seam is arranged along at least a part of the circumferential direction of the cylindrical structure.

[0009] According to the collet of some embodiments of the present application, there are a plurality of deformation seams, and the plurality of deformation seams are arranged at intervals along the circumferential direction of the collet.

[0010] According to the collet of some embodiments of the present application, the second part is configured as a spring, and the spring is adapted to be sleeved on the tool.

[0011] According to the collet of some embodiments of the present application, the material of the collet includes spring steel.

[0012] According to the collet of some embodiments of the present application, the first part includes a plurality of first deformation parts arranged at intervals around the axis of the collet, and a first deformation space is provided between two adjacent first deformation parts; the third part includes a plurality of second deformation parts arranged at intervals around the axis of the collet, and a second deformation space is provided between two adjacent second deformation parts.

[0013] In a second aspect, the present application proposes a tool holder assembly.

[0014] The toolholder assembly according to an embodiment of the present application includes: a toolholder, a tapered hole is formed in the toolholder; a tapered sleeve, the tapered sleeve is used to clamp a tool and includes a first part, a second part and a third part connected in sequence in the axial direction of the tapered sleeve, both the first part and the third part are used to clamp the tool, and the first part and the third part are adapted to abut against the inner wall of the tapered hole to elastically deform in the radial direction of the tapered sleeve, the second part is configured to elastically deform in the axial direction of the tapered sleeve when one of the first part and the third part abuts against the inner wall of the tapered hole to apply an elastic force in the axial direction of the tapered sleeve to the other of the first part and the third part, so that the other of the first part and the third part abuts against the inner wall of the tapered hole.

[0015] For the toolholder assembly according to an embodiment of the present application, by providing a second part that can elastically deform in the axial direction of the tapered sleeve between the first part and the third part of the tapered sleeve, when one of the first part and the third part abuts against the inner wall of the tapered hole to clamp the tool, the second part can elastically deform in the axial direction of the tapered sleeve to apply an elastic force in the axial direction of the tapered sleeve to the other of the first part and the third part, so that the other of the first part and the third part abuts against the inner wall of the tapered hole. In this way, both the first part and the third part can abut against the inner wall of the tapered hole to clamp the tool at the same time, that is, both ends of the tapered sleeve can clamp the tool, thereby realizing double-end synchronous centering of the tapered sleeve, further avoiding the skew of the tool axis, making it easier to control the runout accuracy of the tool, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0016] The toolholder assembly according to some embodiments of the present application further includes: a force application connecting member, the force application connecting member is used to apply a driving force in the axial direction of the tapered sleeve to the second part so that the other of the first part and the third part abuts against the inner wall of the tapered hole.

[0017] For the toolholder assembly according to some embodiments of the present application, the force application connecting member includes a pull stud, the toolholder is provided with a pull stud hole, the pull stud hole communicates with the end with the smallest inner diameter of the tapered hole, the pull stud is adapted to pass through the pull stud hole and is connected to the third part; wherein, the pull stud is configured to pull the third part in the axial direction of the tapered sleeve away from the first part to drive the second part to axially deform, so that the third part abuts against the inner wall of the tapered hole, and the second part applies an elastic force in the axial direction of the tapered sleeve to the first part.

[0018] A tool holder assembly according to some embodiments of the present application, wherein the force - applying connecting member includes a nut, the nut is in threaded engagement with the tool holder at the end with the largest inner diameter of the tapered hole and abuts against the first part in the axial direction of the tapered sleeve; wherein, the nut is configured to push the first part during the process of screwing in to drive the second part to axially deform, so that the first part abuts against the inner wall of the tapered hole, and the second part applies an elastic force in the axial direction of the tapered sleeve to the third part.

[0019] In a third aspect, the present application provides a tool clamping method for a tool holder assembly.

[0020] A tool clamping method for a tool holder assembly according to an embodiment of the present application, the tool holder assembly includes a tool holder and a tapered sleeve, a tapered hole is formed in the tool holder, the tapered sleeve is used for clamping a tool and includes a first part, a second part and a third part connected in sequence in the axial direction of the tapered sleeve, both the first part and the third part are used for clamping the tool, and the first part and the third part are adapted to abut against the inner wall of the tapered hole to elastically deform in the radial direction of the tapered sleeve, the second part is adapted to elastically deform in the axial direction of the tapered sleeve, and the tool clamping method of the tool holder assembly includes: controlling the tapered sleeve to be inserted into the tapered hole; controlling one of the first part and the third part to abut against the inner wall of the tapered hole and elastically deform to clamp the tool; applying a driving force in the axial direction of the tapered sleeve to enable the second part to continue to elastically deform to drive the other of the first part and the third part to abut against the inner wall of the tapered hole and elastically deform to clamp the tool.

[0021] According to the tool clamping method for a tool holder assembly of an embodiment of the present application, when one of the first part and the third part abuts against the inner wall of the tapered hole to clamp the tool, a driving force is applied to enable the second part to elastically deform in the axial direction of the tapered sleeve to apply an elastic force in the axial direction of the tapered sleeve to the other of the first part and the third part, so that the other of the first part and the third part abuts against the inner wall of the tapered hole. In this way, both the first part and the third part can abut against the inner wall of the tapered hole to clamp the tool simultaneously, that is, both ends of the tapered sleeve can clamp the tool, thereby realizing double - end synchronous centering of the tapered sleeve, further avoiding the skew of the tool axis, making it easier to control the run - out accuracy of the tool, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0022] A tool clamping method for a tool holder assembly according to some embodiments of the present application. In the extending direction of the tapered hole, the side wall of the tapered hole includes a connected first tapered surface and a second tapered surface. The minimum inner diameter of the first tapered surface is greater than the maximum inner diameter of the second tapered surface. The first part is adapted to abut against the first tapered surface, and the third part is adapted to abut against the second tapered surface. Controlling one of the first part and the third part to abut against the inner wall of the tapered hole and elastically deform to clamp the tool includes: controlling the first part to abut against the first tapered surface, and the third part to have a clearance fit with the second tapered surface; or controlling the third part to abut against the second tapered surface, and the first part to have a clearance fit with the first tapered surface.

[0023] A tool clamping method for a tool holder assembly according to some embodiments of the present application. The tool holder assembly further includes: a force application connecting member. The tool holder is provided with a pull stud hole, and the pull stud hole communicates with the end having the smallest inner diameter of the tapered hole. When the first part abuts against the first tapered surface and the third part has a clearance fit with the second tapered surface, applying a driving force to the tapered sleeve in the axial direction of the tapered sleeve to cause the second part to continue to elastically deform to drive the third part to abut against the inner wall of the tapered hole and elastically deform to clamp the tool includes: controlling the force application connecting member to pass through the pull stud hole and be connected to the third part; pulling the force application connecting member in the axial direction of the tapered sleeve away from the first part to pull the third part to abut against the second tapered surface, and the second part applying an elastic force in the axial direction of the tapered sleeve to the first part.

[0024] A tool clamping method for a tool holder assembly according to some embodiments of the present application. The tool holder assembly further includes: a force application connecting member. The force application connecting member is disposed at the end having the largest inner diameter of the tapered hole of the tool holder and abuts against the first part in the axial direction of the tapered sleeve. When the third part abuts against the second tapered surface and the first part has a clearance fit with the first tapered surface, applying a driving force to the tapered sleeve in the axial direction of the tapered sleeve to cause the second part to continue to elastically deform to drive the first part to abut against the inner wall of the tapered hole and elastically deform to clamp the tool includes: controlling the force application connecting member to abut against the first part; pushing the force application connecting member in the axial direction of the tapered sleeve toward the third part to push the first part so that the first part abuts against the first tapered surface, and the second part applying an elastic force in the axial direction of the tapered sleeve to the third part.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 Schematic diagram of a taper sleeve according to some embodiments of the present application;

[0028] Figure 2 is Figure 1 Cross-sectional view of the taper sleeve shown;

[0029] Figure 3 Schematic of a taper sleeve according to some other embodiments of the present application Figure 1 ;

[0030] Figure 4 is Figure 3 Cross-sectional view of the taper sleeve shown;

[0031] Figure 5 Schematic diagram of a tool holder assembly according to some embodiments of the present application;

[0032] Figure 6 Schematic diagram of a tool holder assembly according to some other embodiments of the present application;

[0033] Figure 7 Assembly schematic of a taper sleeve and a tool holder according to some embodiments of the present application Figure 1 ;

[0034] Figure 8 Assembly schematic of a taper sleeve and a tool holder according to some embodiments of the present application Figure 2 ;;

[0035] Figure 9 Assembly schematic of a taper sleeve and a tool holder according to some embodiments of the present application Figure 3 ;

[0036] Figure 10 Flow chart of a tool clamping method for a tool holder assembly according to some embodiments of the present application Figure 1 ;

[0037] Figure 11 Flow chart of a tool clamping method for a tool holder assembly according to some embodiments of the present application Figure 2 ;

[0038] Figure 12 Flow chart of a tool clamping method for a tool holder assembly according to some embodiments of the present application Figure 3 .

[0039] Reference numerals:

[0040] Tool holder assembly 100; Tool 200;

[0041] The taper sleeve 10; the first part 11, the first deformation part 111, the first deformation space 112;

[0042] The second part 12, the deformation joint 121,

[0043] The third part 13, the threaded hole 130, the second deformation part 131, the second deformation space 132;

[0044] The tool shank 20; the tapered hole 21, the first tapered surface 211, the second tapered surface 212, the drawbolt hole 22, the force - applying connecting member 30, the drawbolt 301, the nut 302. Detailed implementation manners

[0045] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below through the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiments of this specification and the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. Without conflict, the technical features in the embodiments of this specification and the embodiments can be combined with each other.

[0046] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element. The term "more than two" includes two or more than two cases.

[0047] The following combines the attached Figure 1-12 Describe the taper sleeve 10, the tool shank assembly 100 of the present application and the tool clamping method for the tool shank assembly.

[0048] In a first aspect, the present application proposes a taper sleeve 10. It can be understood that the taper sleeve 10 of the present application refers to a conical structure adapted to be sleeved on the tool 200 and inserted into the tapered hole 21 of the tool shank 20. The outer peripheral wall of the taper sleeve 10 is adapted to cooperate with the inner conical surface of the tapered hole 21. During the process of the taper sleeve 10 being inserted into the tapered hole 21 of the tool shank 20, as the taper sleeve 10 displaces axially, it will force the taper sleeve 10 to radially contract to clamp the tool 200.

[0049] Next, with reference to Figures 1-4 the tapered sleeve 10 according to the embodiments of the present application will be described.

[0050] Please refer to Figures 1-4 , the tapered sleeve 10 according to the embodiments of the present application includes: a first part 11, a second part 12, and a third part 13. In the axial direction of the tapered sleeve 10, the second part 12 is connected between the first part 11 and the third part 13.

[0051] For example, the first part 11 can be the end with a larger radial dimension of the tapered sleeve 10, the third part 13 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13; or the third part 13 can be the end with a larger radial dimension of the tapered sleeve 10, the first part 11 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13.

[0052] Both the first part 11 and the third part 13 are adapted to elastically deform in the radial direction of the tapered sleeve 10 to clamp or release the tool 200. It can be understood that both the first part 11 and the third part 13 are conical structures, and both the first part 11 and the third part 13 are adapted to elastically deform in the radial direction of the tapered sleeve 10. In this way, during the process of inserting the tapered sleeve 10 into the tapered hole 21 of the tool holder 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially contract to clamp the tool 200. During the process of the tapered sleeve 10 extending out of the tapered hole 21 of the tool holder 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially expand to release the tool 200. In this way, it is convenient to realize the clamping of the tool 200, and such a way of clamping the tool 200 is relatively simple, which is beneficial to reducing the operation difficulty.

[0053] The second part 12 is configured to elastically deform in the axial direction of the tapered sleeve 10 to apply an elastic force in the axial direction of the tapered sleeve 10 to the other of the first part 11 and the third part 13 when one of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21, so that the other of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21.

[0054] For example, when the first part 11 abuts against the inner wall of the tapered hole 21 and there is a gap between the third part 13 and the inner wall of the tapered hole 21, a tensile force can be continuously applied to the third part 13. Since the second part 12 can be deformed axially, the third part 13 will pull the second part 12 to axially stretch to generate an elastic force. At this time, the third part 13 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the third part 13 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the first part 11 to make the first part 11 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, thereby realizing double-end synchronous centering of the tapered sleeve 10, further avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and facilitating uniform transmission of the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0055] Or when the third part 13 abuts against the inner wall of the tapered hole 21 and there is a gap between the first part 11 and the inner wall of the tapered hole 21, an axial force can be continuously applied to the first part 11. Since the second part 12 can be deformed axially, the first part 11 will squeeze the second part 12 to axially compress to generate an elastic force. At this time, the first part 11 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the first part 11 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the third part 13 to make the third part 13 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, thereby realizing double-end synchronous centering of the tapered sleeve 10, further avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and facilitating uniform transmission of the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0056] According to the taper sleeve 10 of the embodiment of the present application, by providing a second part 12 that can elastically deform in the axial direction of the taper sleeve 10 between the first part 11 and the third part 13, when one of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21 to clamp the tool 200, the second part 12 can elastically deform in the axial direction of the taper sleeve 10 to apply an elastic force in the axial direction of the taper sleeve 10 to the other of the first part 11 and the third part 13, so that the other of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21. In this way, both the first part 11 and the third part 13 can abut against the inner wall of the tapered hole 21 to clamp the tool 200 at the same time, that is, both ends of the taper sleeve 10 can clamp the tool 200, thereby realizing the double-end synchronous centering of the taper sleeve 10, further avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuations, thereby improving its clamping rigidity.

[0057] In some embodiments, as Figures 1-4 shown, the second part 12 is configured as a cylindrical structure, and the cylindrical structure communicates between the first part 11 and the third part 13, wherein the cylindrical structure is provided with a deformation seam 121, and the deformation seam 121 is arranged between the two ends in the axial direction of the cylindrical structure.

[0058] It can be understood that the setting of the cylindrical structure enables the second part 12 not to interfere with the tool 200 when the tool 200 is inserted into the first part 11 and the third part 13, and the setting of the deformation seam 121 can provide a certain deformation space for the cylindrical structure to deform in the axial direction, so as to meet the deformation requirement of the second part 12 in the axial direction.

[0059] In some implementation manners, in the direction from the first part 11 to the third part 13, that is, in the axial direction of the taper sleeve 10, the inner diameter of the cylindrical structure remains unchanged, and when the first part 11 is the end with a larger radial dimension of the taper sleeve 10 and the third part 13 is the end with a smaller radial dimension of the taper sleeve 10, the inner diameter of the cylindrical structure is less than or equal to the maximum inner diameter of the first part 11 and greater than or equal to the maximum inner diameter of the third part 13. In this way, the radial dimension of the cylindrical structure will not be too large, thereby avoiding interference between the cylindrical structure and the inner wall of the tapered hole 21.

[0060] In some embodiments, as Figure 1 and Figure 3 shown, the deformation seam 121 is arranged along at least part of the circumferential direction of the cylindrical structure. It can be understood that, as Figure 1 and Figure 3As shown, the shape of the deformation joint 121 can be an arc-shaped groove extending along the circumferential direction of the cylindrical structure, and the central angle corresponding to the arc-shaped groove is less than 180 degrees. In this way, in the axial direction of the tapered sleeve 10, the cylindrical structure can be separated into two parts located on both sides of the deformation joint 121 at the deformation joint 121. In this way, the deformation joint 121 can provide a certain deformation space for the axial deformation of the cylindrical structure, so as to meet the deformation requirements of the second part 12 in the axial direction.

[0061] In some embodiments, the deformation joint 121 can also be set to other shapes. For example, the deformation joint 121 can be "Z"-shaped, "S"-shaped or other shapes that can realize the axial deformation of the cylindrical structure, which is not limited here.

[0062] In some embodiments, such as Figure 1 and Figure 3 As shown, there are multiple deformation joints 121, and the multiple deformation joints 121 are arranged at intervals along the circumferential direction of the tapered sleeve 10. In this way, the multiple deformation joints 121 can be used to improve the elastic deformation ability of the second part 12 in the axial direction of the tapered sleeve 10, and the arrangement of the multiple deformation joints 121 can reduce the weight of the second part 12, which is beneficial to realizing the lightweight design of the second part 12.

[0063] In some embodiments, the width of the deformation joint 121 is 0.7 mm - 0.9 mm. For example, the width of the deformation joint 121 is 0.7 mm, 0.8 mm or 0.9 mm. When the width of the deformation joint 121 takes values within the above range, it can ensure that the cylindrical structure can achieve axial deformation while having sufficient structural strength, reducing the risk of breakage due to elastic deformation.

[0064] In some embodiments, the depth of the deformation joint 121 is 39% - 41% of the outer diameter of the cylindrical structure. For example, the depth of the deformation joint 121 is 39%, 40% or 41% of the outer diameter of the cylindrical structure. For example, when the depth of the deformation joint 121 is 40% of the outer diameter of the cylindrical structure, for example, when the diameter of the cylindrical structure is 40 mm, the depth of the deformation joint 121 is 16 mm. That is to say, when the proportional relationship between the depth of the deformation joint 121 and the outer diameter of the cylindrical structure takes values within the above range, the depth of the deformation joint 121 can be designed according to the outer diameter of the cylindrical structure, so as to ensure that the cylindrical structure can achieve axial deformation while having sufficient structural strength, reducing the risk of breakage due to elastic deformation.

[0065] In some embodiments, the second part 12 is configured as a spring, and the spring is adapted to be sleeved on the tool 200. It can be understood that the spring has the ability of elastic deformation, which can meet the elastic deformation requirements of the second part 12 in the axial direction of the tapered sleeve 10, and the spring is adapted to be sleeved on the tool 200, so that when the tool 200 is inserted into the first part 11 and the third part 13, the spring will not interfere with the tool 200. In this way, it is convenient for the cooperation between the tapered sleeve 10 and the tool 200. At the same time, the cost of setting the spring is relatively low, which is beneficial to reducing the design cost.

[0066] In some embodiments, the material of the tapered sleeve 10 includes spring steel. For example, the selected type of the tapered sleeve 10 can be 65Mn or 60Si2Mn. In this way, the tapered sleeve 10 can have a certain ability of elastic deformation while having sufficient structural strength, thereby improving the structural stability of the tapered sleeve 10.

[0067] Of course, the material of the tapered sleeve 10 can also be alloy steel or other elastic materials, which are not limited herein.

[0068] In some embodiments, as Figures 1-4 shown, the first part 11 includes a plurality of first deformation portions 111 spaced apart around the axis of the tapered sleeve 10, and a first deformation space 112 is provided between two adjacent first deformation portions 111. It can be understood that when the first part 11 is inserted into the tapered hole 21 and moves axially, the plurality of first deformation portions 111 will deform in a direction close to the axis of the tapered sleeve 10, that is, the first part 11 will radially contract to clamp the tool 200, and the radial contraction of the first part 11 will cause the radial dimension of the first part 11 to decrease. Therefore, the first deformation space 112 is provided between two adjacent first deformation portions 111 so that the two adjacent first deformation portions 111 will not be unable to contract due to their interference when the first part 11 radially contracts.

[0069] In some embodiments, the first deformation space 112 is arranged along the axial direction of the first part 11, and the width of the first deformation space 112 is 0.2 mm - 0.4 mm. For example, the width of the first deformation space 112 is 0.2 mm, 0.3 mm or 0.4 mm. When the width of the first deformation space 112 is within the above value range, the first part 11 can have sufficient deformation ability when radially contracting.

[0070] In some embodiments, the depth of the first deformation space 112 penetrates the wall thickness. For example, when the wall thickness of the first part 11 is 8 mm, the depth of the first deformation space 112 is 8 mm. In this way, the two adjacent first deformation portions 111 will not be unable to contract due to their interference and can have the first deformation space 112.

[0071] As Figures 1-4As shown, the third part 13 includes a plurality of second deformation parts 131 arranged at intervals around the axis of the tapered sleeve 10, and a second deformation space 132 is provided between two adjacent second deformation parts 131. It can be understood that when the third part 13 is inserted into the tapered hole 21 and axially moved, the plurality of second deformation parts 131 will deform in a direction close to the axis of the tapered sleeve 10, that is, the third part 13 will radially contract to clamp the tool 200, and the radial contraction of the third part 13 will cause the radial dimension of the third part 13 to decrease. Therefore, the second deformation space 132 is provided between two adjacent second deformation parts 131 so that when the third part 13 radially contracts, the two adjacent second deformation parts 131 will not be unable to contract due to their interference with each other.

[0072] In some embodiments, the second deformation space 132 is arranged along the axial direction of the third part 13, and the width of the second deformation space 132 is 0.2 mm - 0.4 mm. For example, the width of the second deformation space 132 is 0.2 mm, 0.3 mm or 0.4 mm. When the width of the second deformation space 132 is within the above value range, the third part 13 can have sufficient deformation ability when radially contracting.

[0073] In some embodiments, the depth of the second deformation space 132 penetrates the wall thickness. For example, when the wall thickness of the third part 13 is 8 mm, the depth of the second deformation space 132 is 8 mm. In this way, it can be ensured that the two adjacent second deformation parts 131 will not be unable to contract due to their interference with each other because of the second deformation space 132.

[0074] In a second aspect, the present application proposes a tool holder assembly 100.

[0075] Next, Figures 1-9 describe the tool holder assembly 100 according to the embodiments of the present application.

[0076] The tool holder assembly 100 according to the embodiments of the present application includes: a tapered sleeve 10 and a tool holder 20.

[0077] It can be understood that the tapered sleeve 10 in the present application refers to a tapered structure adapted to be sleeved on the tool 200 and inserted into the tapered hole 21 of the tool holder 20. The outer peripheral wall of the tapered sleeve 10 is adapted to cooperate with the inner tapered surface of the tapered hole 21. During the process of inserting the tapered sleeve 10 into the tapered hole 21 of the tool holder 20, as the tapered sleeve 10 axially displaces, the tapered sleeve 10 will be forced to radially contract to clamp the tool 200.

[0078] As Figures 1-4 shown, in the axial direction of the tapered sleeve 10, the tapered sleeve 10 includes a first part 11, a second part 12 and a third part 13 connected in sequence, as Figure 5 and Figure 6As shown, a tapered hole 21 is formed in the tool shank 20, and the tapered sleeve 10 is adapted to be inserted into the tapered hole 21 and used for clamping the tool 200.

[0079] For example, the first part 11 can be the end with a larger radial dimension of the tapered sleeve 10, the third part 13 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13; or the third part 13 can be the end with a larger radial dimension of the tapered sleeve 10, the first part 11 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13.

[0080] Both the first part 11 and the third part 13 are used for clamping the tool 200, and the first part 11 and the third part 13 are adapted to abut against the inner wall of the tapered hole 21 to elastically deform in the radial direction of the tapered sleeve 10. It can be understood that both the first part 11 and the third part 13 are tapered structures, and both the first part 11 and the third part 13 are adapted to elastically deform in the radial direction of the tapered sleeve 10. In this way, during the process of inserting the tapered sleeve 10 into the tapered hole 21 of the tool shank 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially contract to clamp the tool 200. During the process of the tapered sleeve 10 extending out of the tapered hole 21 of the tool shank 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially expand to release the tool 200. In this way, it is convenient to realize the clamping of the tool 200, and this way of clamping the tool 200 is relatively simple, which is beneficial to reducing the operation difficulty.

[0081] The second part 12 is configured to elastically deform axially of the tapered sleeve 10 to apply an axial elastic force to the other of the first part 11 and the third part 13 when one of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21, so that the other of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21.

[0082] For example, when the first part 11 abuts against the inner wall of the tapered hole 21 and there is a gap between the third part 13 and the inner wall of the tapered hole 21, a tensile force can be continuously applied to the third part 13. Since the second part 12 can be deformed axially, the third part 13 will pull the second part 12 to axially stretch to generate an elastic force. At this time, the third part 13 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the third part 13 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the first part 11 to make the first part 11 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the taper sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the taper sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to the uniform transmission of the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0083] Or when the third part 13 abuts against the inner wall of the tapered hole 21 and there is a gap between the first part 11 and the inner wall of the tapered hole 21, an axial force can be continuously applied to the first part 11. Since the second part 12 can be deformed axially, the first part 11 will squeeze the second part 12 to axially compress to generate an elastic force. At this time, the first part 11 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the first part 11 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the third part 13 to make the third part 13 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the taper sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the taper sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to the uniform transmission of the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0084] According to the tool holder assembly 100 of the embodiments of the present application, the taper sleeve 10 is provided with a second portion 12 that can elastically deform in the axial direction of the taper sleeve 10 between the first portion 11 and the third portion 13, so that when one of the first portion 11 and the third portion 13 abuts against the inner wall of the tapered hole 21 to clamp the tool 200, the second portion 12 can elastically deform in the axial direction of the taper sleeve 10 to apply an elastic force in the axial direction of the taper sleeve 10 to the other of the first portion 11 and the third portion 13, so that the other of the first portion 11 and the third portion 13 abuts against the inner wall of the tapered hole 21. In this way, both the first portion 11 and the third portion 13 can abut against the inner wall of the tapered hole 21 to clamp the tool 200 at the same time, that is, both ends of the taper sleeve 10 can clamp the tool 200, thereby realizing the double-end synchronous centering of the taper sleeve 10, further avoiding the skew of the axis of the tool 200, making it easier to control the runout accuracy of the tool 200, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0085] In some embodiments, as Figure 5 and Figure 6 shown, the tool holder assembly 100 further includes: a force application connecting member 30.

[0086] The force application connecting member 30 is used to apply a driving force in the axial direction of the taper sleeve 10 to the second portion 12 so that the other of the first portion 11 and the third portion 13 abuts against the inner wall of the tapered hole 21.

[0087] It can be understood that in the axial direction of the taper sleeve 10, the second portion 12 is connected between the first portion 11 and the third portion 13, and the force application connecting member 30 applying an axial force to the second portion 12 may include that the force application connecting member 30 is directly connected to the second portion 12 to apply an axial force to the second portion 12, or the force application connecting member 30 may be connected to the first portion 11 and / or the third portion 13 to indirectly apply an axial force to the second portion 12, which is not limited herein.

[0088] For example, when the first part 11 abuts against the inner wall of the tapered hole 21 and there is a gap between the third part 13 and the inner wall of the tapered hole 21, the force application connecting member 30 can be connected to the third part 13 to apply a tensile force to the third part 13. Since the second part 12 can be deformed axially, the third part 13 will pull the second part 12 to axially stretch to generate an elastic force. At this time, the third part 13 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the third part 13 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the first part 11 to make the first part 11 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the tapered sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to evenly transmitting the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0089] Or as Figure 7 shown, when the third part 13 abuts against the inner wall of the tapered hole 21 and there is a gap between the first part 11 and the inner wall of the tapered hole 21, the force application connecting member 30 can be connected to the first part 11 to apply an axial force to the first part 11. Since the second part 12 can be deformed axially, the first part 11 will squeeze the second part 12 to axially compress (the state of the second part 12 as shown in Figure 8 ) to generate an elastic force. At this time, the first part 11 generates a certain displacement axially and abuts against the inner wall of the tapered hole 21, so that the first part 11 radially contracts (the state where the third part 13 abuts against the inner wall of the tapered hole 21 as shown in Figure 9 ) to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the third part 13 to make the third part 13 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the tapered sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to evenly transmitting the clamping force. In this way, during the machining process, it is not easy for the tool 200 to loosen due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0090] In some embodiments, such as Figure 5As shown, the force - applying connecting member 30 includes a rivet 301. The tool shank 20 is provided with a rivet hole 22. The rivet hole 22 communicates with the end with the smallest inner diameter of the tapered hole 21. The rivet 301 is adapted to pass through the rivet hole 22 and is connected to the third part 13. Among them, the rivet 301 is configured to pull the third part 13 in the axial direction of the tapered sleeve 10 away from the first part 11 to drive the second part 12 to axially deform, so that the third part 13 abuts against the inner wall of the tapered hole 21, and the second part 12 applies an elastic force to the first part 11 in the axial direction of the tapered sleeve 10.

[0091] For example Figure 5 As shown, a threaded hole 130 is provided at the end of the third part 13. The rivet 301 is adapted to pass through the rivet hole 22 to be threadedly connected to the threaded hole 130. In this way, when the first part 11 abuts against the inner wall of the tapered hole 21 and there is a gap between the third part 13 and the inner wall of the tapered hole 21, the rivet 301 can be used to pull the third part 13. Since the second part 12 can axially deform, the third part 13 will pull the second part 12 to axially stretch to generate an elastic force. At this time, the third part 13 generates a certain displacement in the axial direction and abuts against the inner wall of the tapered hole 21, so that the third part 13 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the first part 11 to stably keep the first part 11 radially contracted to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, thereby realizing double - end synchronous centering of the tapered sleeve 10, further avoiding the axis skew of the tool 200, making it easier to control the run - out accuracy of the tool 200, and facilitating the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0092] In some other embodiments, as Figure 6 As shown, the force - applying connecting member 30 includes a nut 302. The nut 302 is in threaded fit with the tool shank 20 at the end with the largest inner diameter of the tapered hole 21 and abuts against the first part 11 in the axial direction of the tapered sleeve 10. Among them, the nut 302 is configured to push the first part 11 during the screwing - in process to drive the second part 12 to axially deform, so that the first part 11 abuts against the inner wall of the tapered hole 21, and the second part 12 applies an elastic force to the third part 13 in the axial direction of the tapered sleeve 10.

[0093] For example Figure 7 As shown, when the third part 13 abuts against the inner wall of the tapered hole 21 and there is a gap between the first part 11 and the inner wall of the tapered hole 21, the threaded fit between the nut 302 and the tool shank 20 can be utilized. During the screwing - in process of the nut 302, the first part 11 is pushed to axially compress the second part 12 (as Figure 8In the second part 12 state shown, at this time, the first part 11 is axially displaced under the extrusion of the nut 302, so as to abut against the inner wall of the tapered hole 21 to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the third part 13 to stably maintain the radial contraction of the third part 13 to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the tapered sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0094] Thirdly, the present application proposes a tool clamping method for a tool holder assembly.

[0095] Please refer to the attached Figure 1-12 to describe the tool clamping method for the tool holder assembly according to the embodiments of the present application.

[0096] The tool clamping method for the tool holder assembly according to the embodiments of the present application is applicable to the tool holder assembly 100, and the tool holder assembly 100 includes a tapered sleeve 10 and a tool holder 20.

[0097] It can be understood that the tapered sleeve 10 of the present application refers to a tapered structure adapted to be sleeved on the tool 200 and inserted into the tapered hole 21 of the tool holder 20. The outer peripheral wall of the tapered sleeve 10 is adapted to cooperate with the inner tapered surface of the tapered hole 21. During the process of inserting the tapered sleeve 10 into the tapered hole 21 of the tool holder 20, as the tapered sleeve 10 is axially displaced, it will force the tapered sleeve 10 to radially contract to clamp the tool 200.

[0098] Such as Figures 1-4 shown, in the axial direction of the tapered sleeve 10, the tapered sleeve 10 includes a first part 11, a second part 12 and a third part 13 connected in sequence, as Figure 5 and Figure 6 shown, a tapered hole 21 is formed in the tool holder 20, and the tapered sleeve 10 is adapted to be inserted into the tapered hole 21 and used to clamp the tool 200.

[0099] For example, the first part 11 can be the end with a larger radial dimension of the tapered sleeve 10, the third part 13 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13; or the third part 13 can be the end with a larger radial dimension of the tapered sleeve 10, the first part 11 can be the end with a smaller radial dimension of the tapered sleeve 10, and the second part 12 is connected between the first part 11 and the third part 13.

[0100] Both the first part 11 and the third part 13 are used to clamp the tool 200, and the first part 11 and the third part 13 are adapted to abut against the inner wall of the tapered hole 21 to elastically deform in the radial direction of the tapered sleeve 10. It can be understood that both the first part 11 and the third part 13 are of tapered structures, and both the first part 11 and the third part 13 are adapted to elastically deform in the radial direction of the tapered sleeve 10. In this way, during the process of inserting the tapered sleeve 10 into the tapered hole 21 of the tool shank 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially contract to clamp the tool 200. During the process of the tapered sleeve 10 extending out of the tapered hole 21 of the tool shank 20, as the tapered sleeve 10 displaces axially, it will force the first part 11 and / or the third part 13 to radially expand to release the tool 200. In this way, it is convenient to realize the clamping of the tool 200, and this way of clamping the tool 200 is relatively simple, which helps to reduce the operation difficulty.

[0101] The second part 12 is adapted to elastically deform in the axial direction of the tapered sleeve 10 to force the first part 11 and / or the third part 13 to displace axially so as to radially contract to clamp the tool 200, and further enable both the first part 11 and the third part 13 to abut against the inner wall of the tapered hole 21 to clamp the tool 200 simultaneously, that is, both ends of the tapered sleeve 10 can clamp the tool 200, thereby realizing the double-end synchronous centering of the tapered sleeve 10, further avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being conducive to the uniform transmission of the clamping force. In this way, during the machining process, it is not easy for the tool 200 to become loose due to vibration or cutting force fluctuations, thereby improving its clamping rigidity.

[0102] As Figure 10 shown, the method for clamping the tool 200 of the tool shank assembly 100 includes:

[0103] S10: Control the tapered sleeve 10 to be inserted into the tapered hole 21;

[0104] As Figure 7 shown, S20: Control one of the first part 11 and the third part 13 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200;

[0105] As Figure 9 shown, S30: Apply a driving force to the tapered sleeve 10 in the axial direction of the tapered sleeve 10 to enable the second part 12 to continue to elastically deform to drive the other of the first part 11 and the third part 13 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200.

[0106] According to the tool clamping method for a tool holder assembly according to an embodiment of the present application, when one of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21 to clamp the tool 200, a driving force is applied to enable the second part 12 to elastically deform axially of the tapered sleeve 10 to apply an elastic force axially of the tapered sleeve 10 to the other of the first part 11 and the third part 13, so that the other of the first part 11 and the third part 13 abuts against the inner wall of the tapered hole 21. In this way, both the first part 11 and the third part 13 can abut against the inner wall of the tapered hole 21 to clamp the tool 200 simultaneously, that is, both ends of the tapered sleeve 10 can clamp the tool 200, thereby realizing double-end synchronous centering of the tapered sleeve 10, further avoiding the skew of the axis of the tool 200, making it easier to control the runout accuracy of the tool 200, and being beneficial to uniformly transmitting the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0107] In some embodiments, as Figures 7-9 shown, in the extending direction of the tapered hole 21, the side wall of the tapered hole 21 includes a connected first tapered surface 211 and a second tapered surface 212. The minimum inner diameter of the first tapered surface 211 is greater than the maximum inner diameter of the second tapered surface 212. The first part 11 is adapted to abut against the first tapered surface 211, and the third part 13 is adapted to abut against the second tapered surface 212.

[0108] As Figure 11 shown, S20: Controlling one of the first part 11 and the third part 13 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200 includes:

[0109] S21: Controlling the first part 11 to abut against the first tapered surface 211 and having a clearance fit between the third part 13 and the second tapered surface 212. In this way, a clearance is provided between the third part 13 and the second tapered surface 212 to facilitate the execution of the subsequent step S30, so as to apply a driving force axially of the tapered sleeve 10 to enable the second part 12 to continue to elastically deform to drive the third part 13 and the second tapered surface 212 to abut against each other and elastically deform to clamp the tool 200.

[0110] Or as Figure 7 shown, S20: Controlling one of the first part 11 and the third part 13 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200 includes:

[0111] S22: Control the third part 13 to abut against the second conical surface 212, and the first part 11 is in clearance fit with the first conical surface 211. In this way, a gap is formed between the first part 11 and the first conical surface 211, which is beneficial to the execution of the subsequent step S30, so as to apply a driving force to the cone sleeve 10 in the axial direction of the cone sleeve 10 to cause the first part 11 to continue to elastically deform to drive the first part 11 to abut against the first conical surface 211 and elastically deform to clamp the tool 200.

[0112] In some embodiments, the tool holder assembly 100 further includes: a force-applying connecting member 30, the tool holder 20 is provided with a pull stud hole 22, and the pull stud hole 22 communicates with the end with the smallest inner diameter of the tapered hole 21.

[0113] As Figure 12 shown, when the first part 11 abuts against the first conical surface 211 and the third part 13 is in clearance fit with the second conical surface 212, S30: Applying a driving force to the cone sleeve 10 in the axial direction of the cone sleeve 10 to cause the second part 12 to continue to elastically deform to drive the third part 13 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200 includes:

[0114] S31: Control the force-applying connecting member 30 to pass through the pull stud hole 22 and be connected to the third part 13;

[0115] S311: Pull the force-applying connecting member 30 in the axial direction of the cone sleeve 10 away from the first part 11 to pull the third part 13 to abut against the second conical surface 212, and the second part 12 applies an elastic force to the first part 11 in the axial direction of the cone sleeve 10.

[0116] For example, when the first part 11 abuts against the first conical surface 211 and there is a gap between the third part 13 and the second conical surface 212, the third part 13 can be pulled by the pull stud 301. Since the second part 12 can deform axially, the third part 13 will pull the second part 12 to axially stretch to generate an elastic force. At this time, the third part 13 generates a certain displacement in the axial direction and abuts against the inner wall of the tapered hole 21, so that the third part 13 radially contracts to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the first part 11 to make the first part 11 stably maintain radial contraction to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the cone sleeve 10 can clamp the tool 200, so as to realize double-end synchronous centering of the cone sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being beneficial to the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0117] In a specific embodiment, for example, the material of the tool shank 20 is 42CrMo, the hardness after quenching and tempering is HRC28 - 32, the taper of the inner hole of the tool shank 20 is 1:15, and the tolerance is IT7; the diameter of the large end taper hole is 31.7 mm; the material of the taper sleeve 10 is 60Si2Mn spring steel, and the heat treatment hardness is HRC45 - 50; the fitting clearance of the large end taper surface of the taper sleeve 10 is 0.03 mm, the coaxiality of the large and small taper surfaces of the outer circle and the inner hole of the taper sleeve 10 is 0.002, the diameter of the inner hole of the taper sleeve 10 is 20 mm, the taper of the large and small end taper surfaces of the taper sleeve 10 is 1:15, and the tolerance is IT7, the diameter of the large end of the taper sleeve 10 is 32 mm, the first deformation spaces 112 and the second deformation spaces 132: 6 each, the groove width is 0.8 mm, and the groove depth is 5.5 mm (wall thickness 5.5 mm);

[0118] The deformation joints 121: 4 (circumferentially staggered by 90 degrees), the groove width is 1.2, the groove pitch is 6 mm, the groove depth is 40% of the diameter, and the wall thickness is 3 mm;

[0119] The force application connection structure is a pull stud 301, and the pull stud 301: M10 thread, grade 8.8;

[0120] The specific operation steps of the rear - pull type:

[0121] (1) Insert the taper sleeve 10 into the tapered hole 21 of the tool shank 20 to ensure that the first part 11 contacts the first tapered surface 211;

[0122] (2) Screw in the pull stud 301 for pre - tightening, and the first part 11 radially contracts by 0.01 mm to clamp the tool 200;

[0123] (3) Continue to tighten, and the second part 12 axially (22) stretches by 0.9 mm to drive the third part 13 to contact the second tapered surface 212;

[0124] (4) Continuously apply force until the predetermined torque of 30 N·m, and the third part 13 contracts by 0.01 mm and clamps the tool 200 for the second time.

[0125] The above - mentioned specific embodiments have at least the following technical effects:

[0126] 1. The detected run - out accuracy ≤ 0.003 mm.

[0127] 2. Under the same machining conditions, for a D20 diameter end mill with a 80 - mm overhang, the machining vibration sound is better than that of the ER32 tool shank 20.

[0128] The applicable scenarios of the above - mentioned specific embodiments: The types of tools 200: Φ10 - Φ32 mm end mills, drills.

[0129] In some embodiments, the tool shank assembly 100 further includes: a force application connecting member 30, which is disposed at the end of the tool shank 20 with the largest inner diameter of the tapered hole 21 and abuts against the first part 11 in the axial direction of the tapered sleeve 10.

[0130] As Figure 12 shown, when the third part 13 abuts against the second tapered surface 212 and the first part 11 is in clearance fit with the first tapered surface 211, S30: applying a driving force to the tapered sleeve 10 in the axial direction of the tapered sleeve 10 to cause the second part 12 to continue to elastically deform to drive the first part 11 to abut against the inner wall of the tapered hole 21 and elastically deform to clamp the tool 200 includes:

[0131] S32: controlling the force application connecting member 30 to abut against the first part 11;

[0132] S321: pushing the force application connecting member 30 in the axial direction of the tapered sleeve 10 toward the direction close to the third part 13 to push the first part 11 so that the first part 11 abuts against the first tapered surface 211, and the second part 12 applies an elastic force in the axial direction of the tapered sleeve 10 to the third part 13.

[0133] For example Figure 7 shown, when the third part 13 abuts against the second tapered surface 212 and there is a gap between the first part 11 and the first tapered surface 211, the threaded fit between the nut 302 and the tool shank 20 can be utilized to push the first part 11 during the process of screwing in the nut 302 to axially compress the second part 12 (such as the state of the second part 12 shown in Figure 8 ). At this time, the first part 11 generates an axial displacement under the extrusion of the nut 302, so as to abut against the first tapered surface 211 to clamp the tool 200. At the same time, the second part 12 will apply an elastic force to the third part 13 to stably maintain the radial contraction of the third part 13 to clamp the tool 200. In this way, both the first part 11 and the third part 13 can clamp the tool 200, that is, both ends of the tapered sleeve 10 can clamp the tool 200, so as to realize the double-end synchronous centering of the tapered sleeve 10, thereby avoiding the axis skew of the tool 200, making it easier to control the runout accuracy of the tool 200, and being beneficial to the uniform transmission of the clamping force. In this way, during the machining process, the tool 200 is not easily loosened due to vibration or cutting force fluctuation, thereby improving its clamping rigidity.

[0134] In a specific embodiment, for example, the material of the tool shank 20 is 42CrMo, the hardness after quenching and tempering is HRC28 - 32, the taper of the inner hole of the tool shank 20 is 1:15, and the tolerance is IT7; the diameter of the large end taper hole is 31.7 mm; the material of the taper sleeve 10 is 60Si2Mn spring steel, and the heat treatment hardness is HRC45 - 50; the fitting clearance of the large end taper surface of the taper sleeve 10 is 0.03 mm, the coaxiality of the large and small taper surfaces of the outer circle and the inner hole of the taper sleeve 10 is 0.002, the diameter of the inner hole of the taper sleeve 10 is 20 mm, the taper of the large and small end taper surfaces of the taper sleeve 10 is 1:15, and the tolerance is IT7, the diameter of the large end of the taper sleeve 10 is 32 mm, the first deformation spaces 112 and the second deformation spaces 132: 6 each, the groove width is 0.8 mm, and the groove depth is 5.5 mm (wall thickness 5.5 mm); the deformation joints 121: 4 (circumferentially staggered by 90 degrees), the groove width is 1.2, the groove pitch is 6 mm, the groove depth is 40% of the diameter, and the wall thickness is 3 mm;

[0135] The tool shank 20 is provided with an external thread for threaded cooperation with the nut 302. The parameters of the external thread are M50X2, and the width of the annular pressing surface of the tool shank 20 for abutting against the nut 302 is 5 mm, and the surface roughness Ra is 1.6 μm. The parameters of the nut 302 are M50X2 thread, grade 8.8.

[0136] The operation steps of the front - pressing type are as follows:

[0137] (1) Insert the taper sleeve 10 into the tapered hole 21 of the tool shank 20 to ensure that the third part 13 contacts the second tapered surface 212;

[0138] (2) Pre - tighten the nut 302, and the third part 13 radially contracts by 0.01 mm to clamp the tool 200;

[0139] (3) Continue to tighten, the second part 12 axially deforms and compresses by 0.9 mm, driving the first part 11 to contact the first tapered surface 211; continue to apply force until the predetermined torque of 90 N·m, and the first part 11 contracts by 0.01 mm and clamps the tool 200.

[0140] The above - mentioned specific embodiment has at least the following technical effects

[0141] 1. The detected run - out accuracy ≤ 0.003 mm.

[0142] 2. Under the same processing conditions, for a D20 diameter end mill with a 80 - mm overhang, the machining vibration sound is better than that of the ER32 tool shank 20;

[0143] The applicable scenarios of the above - mentioned specific embodiment: The type of the tool 200: face mill and boring tool with a diameter of Φ20 - Φ50 mm.

[0144] In summary, the clamping process of the tool 200 of the tool shank assembly 100 of the present application can be divided into three stages, specifically as follows:

[0145] (1) Initial contact stage:

[0146] When no axial force is applied, one of the first part 11 and the third part 13 contacts the inner conical surface of the conical hole 21, and there is a gap of 0.03 - 0.15 mm (controlled by design) between the other and the conical surface.

[0147] (2) First-stage clamping:

[0148] Apply an axial force (tensile or compressive force) to drive the collet 10 to move axially. The part in contact with the side conical surface first undergoes radial contraction (0.005 - 0.03 mm) to clamp the cutting tool 200.

[0149] At the same time, the elastic deformation of the second part 12 drives the other part with a gap from the conical surface to move, eliminating the gap and contacting the conical surface. At this time, the second part 12 undergoes elastic deformation (compression or elongation of 0.2 - 1.5 mm) to store elastic potential energy.

[0150] (3) Second-stage clamping:

[0151] Continue to apply force until a predetermined torque (20 - 60 N·m for the pull-back type, 50 - 120 N·m for the front-press type). The other of the first part 11 and the third part 13 secondarily clamps the cutting tool 200 through radial contraction (0.005 - 0.03 mm) to form a double-end cooperative force. Ensure that the double-end conical surfaces are clamped synchronously, making the axis of the cutting tool 200 coaxial with the tool shank 20 (radial runout ≤ 0.005 mm).

[0152] Thus, the cutting tool clamping method for the tool shank assembly of the present application has at least the following advantages:

[0153] 1. High-precision centering: The step-by-step clamping at both ends (the first part 11 and the third part 13) improves the radial runout accuracy of the cutting tool 200 from ≥ 0.015 mm of the traditional structure to ≤ 0.005 mm, reducing the centering error by 67%.

[0154] 2. High-rigidity clamping: The cooperative force of the double conical surfaces eliminates the clearance between the small-end conical surface fits, improving the clamping rigidity.

[0155] 3. Significantly reduce costs: The collet 10 has elastic expansion and contraction in both the radial and axial directions. The taper accuracy of the collet 10 and the tool shank 20 and the manufacturing accuracy of the inner hole of the collet 10 can be reduced, but it does not affect the clamping accuracy of the cutting tool 200, thus reducing the manufacturing requirements. The taper of the conical surface of the conical hole 21 of the tool shank 20, the taper of the outer conical surface of the collet 10, and the machining tolerance of the central inner hole of the collet 10 can be relaxed to IT7 level (traditional IT6 level).

[0156] 4. Wide applicability: It supports two modes, namely the rear-pulling type (light tool 200) and the front-pressing type (heavy tool 200), covering the clamping requirements of tools 200 with a diameter ranging from Φ10mm to Φ50mm.

[0157] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present application.

[0158] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0159] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0160] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0161] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0162] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A tapered sleeve (10), characterized in that, The taper sleeve (10) is adapted to be sleeved on a tool (200) and inserted into a tapered hole (21) of a tool holder (20), and the taper sleeve (10) includes: A first part (11), a second part (12) and a third part (13). In the axial direction of the taper sleeve (10), the second part (12) is connected between the first part (11) and the third part (13), and both the first part (11) and the third part (13) are adapted to elastically deform in the radial direction of the taper sleeve (10) to clamp or release the tool (200); The second part (12) is configured to elastically deform in the axial direction of the taper sleeve (10) when one of the first part (11) and the third part (13) abuts against the inner wall of the tapered hole (21), so as to apply an elastic force in the axial direction of the taper sleeve (10) to the other of the first part (11) and the third part (13), so that the other of the first part (11) and the third part (13) abuts against the inner wall of the tapered hole (21).

2. The tapered sleeve (10) according to claim 1, wherein, The second part (12) is configured as a cylindrical structure, and the cylindrical structure communicates between the first part (11) and the third part (13), wherein The cylindrical structure is provided with a deformation slit (121), and the deformation slit (121) is arranged between two ends in the axial direction of the cylindrical structure.

3. The tapered sleeve (10) according to claim 2, characterized in that, The deformation slit (121) is arranged at least partially along the circumferential direction of the cylindrical structure.

4. The tapered sleeve (10) according to claim 3, characterized in that, There are a plurality of the deformation slits (121), and the plurality of deformation slits (121) are arranged at intervals along the circumferential direction of the taper sleeve (10).

5. The tapered sleeve (10) according to claim 1, characterized in that, The second part (12) is configured as a spring, and the spring is adapted to be sleeved on the tool (200).

6. The tapered sleeve (10) according to claim 1, characterized in that, The material of the taper sleeve (10) includes spring steel.

7. The tapered sleeve (10) according to any one of claims 1-6, characterized in that, The first part (11) includes a plurality of first deformation parts (111) arranged at intervals around the axis of the taper sleeve (10), and a first deformation space (112) is provided between two adjacent first deformation parts (111). The third part (13) includes a plurality of second deformation parts (131) arranged at intervals around the axis of the taper sleeve (10), and a second deformation space (132) is provided between two adjacent second deformation parts (131).

8. A tool holder assembly (100), characterized in that, Including: A tool holder (20), and a tapered hole (21) is formed in the tool holder (20); The tapered sleeve (10), the tapered sleeve (10) is used to clamp the cutting tool (200) and includes a first part (11), a second part (12) and a third part (13) connected in sequence in the axial direction of the tapered sleeve (10). Both the first part (11) and the third part (13) are used to clamp the cutting tool (200), and the first part (11) and the third part (13) are adapted to abut against the inner wall of the tapered hole (21) to elastically deform in the radial direction of the tapered sleeve (10). The second part (12) is configured to elastically deform in the axial direction of the tapered sleeve (10) when one of the first part (11) and the third part (13) abuts against the inner wall of the tapered hole (21) to apply an elastic force in the axial direction of the tapered sleeve (10) to the other of the first part (11) and the third part (13), so that the other of the first part (11) and the third part (13) abuts against the inner wall of the tapered hole (21).

9. The tool holder assembly (100) according to claim 8, characterized in that, It further includes: A force - applying connecting member (30), the force - applying connecting member (30) is used to apply a driving force in the axial direction of the tapered sleeve (10) to the second part (12) so that the other of the first part (11) and the third part (13) abuts against the inner wall of the tapered hole (21).

10. The tool shank assembly (100) according to claim 9, characterized in that, The force - applying connecting member (30) includes a pull - stud (301). The tool shank (20) is provided with a pull - stud hole (22), and the pull - stud hole (22) communicates with the end with the smallest inner diameter of the tapered hole (21). The pull - stud (301) is adapted to pass through the pull - stud hole (22) and is connected to the third part (13); Wherein, the pull - stud (301) is configured to pull the third part (13) in the axial direction of the tapered sleeve (10) away from the first part (11) to drive the second part (12) to axially deform, so that the third part (13) abuts against the inner wall of the tapered hole (21), and the second part (12) applies an elastic force in the axial direction of the tapered sleeve (10) to the first part (11).

11. The tool holder assembly (100) according to claim 9, characterized in that, The force - applying connecting member (30) includes a nut (302). The nut (302) is in threaded cooperation with the tool shank (20) at the end with the largest inner diameter of the tapered hole (21) and abuts against the first part (11) in the axial direction of the tapered sleeve (10); Wherein, the nut (302) is configured to push the first part (11) during the process of screwing in to drive the second part (12) to axially deform, so that the first part (11) abuts against the inner wall of the tapered hole (21), and the second part (12) applies an elastic force in the axial direction of the tapered sleeve (10) to the third part (13).

12. A tool clamping method for a tool holder assembly, characterized in that, The tool shank assembly (100) includes a tool shank (20) and a tapered sleeve (10). A tapered hole (21) is formed in the tool shank (20). The tapered sleeve (10) is used for clamping a tool (200) and includes, in the axial direction of the tapered sleeve (10), a first part (11), a second part (12), and a third part (13) that are connected in sequence. Both the first part (11) and the third part (13) are used for clamping the tool (200), and the first part (11) and the third part (13) are adapted to abut against the inner wall of the tapered hole (21) to elastically deform in the radial direction of the tapered sleeve (10). The second part (12) is adapted to elastically deform in the axial direction of the tapered sleeve (10). The method for clamping the tool (200) of the tool shank assembly (100) includes: Controlling the tapered sleeve (10) to be inserted into the tapered hole (21); Controlling one of the first part (11) and the third part (13) to abut against the inner wall of the tapered hole (21) and elastically deform to clamp the tool (200); Applying a driving force to the tapered sleeve (10) in the axial direction of the tapered sleeve (10) so that the second part (12) continues to elastically deform to drive the other of the first part (11) and the third part (13) to abut against the inner wall of the tapered hole (21) and elastically deform to clamp the tool (200).

13. The tool clamping method for a tool holder assembly according to claim 12, characterized in that, In the extending direction of the tapered hole (21), the side wall of the tapered hole (21) includes a connected first tapered surface (211) and a second tapered surface (212). The minimum inner diameter of the first tapered surface (211) is greater than the maximum inner diameter of the second tapered surface (212). The first part (11) is adapted to abut against the first tapered surface (211), and the third part (13) is adapted to abut against the second tapered surface (212). The controlling one of the first part (11) and the third part (13) to abut against the inner wall of the tapered hole (21) and elastically deform to clamp the tool (200) includes: Controlling the first part (11) to abut against the first tapered surface (211), and the third part (13) to have a clearance fit with the second tapered surface (212); Or controlling the third part (13) to abut against the second tapered surface (212), and the first part (11) to have a clearance fit with the first tapered surface (211).

14. The tool clamping method for a tool holder assembly according to claim 13, characterized in that, The tool holder assembly (100) further includes: a force application connecting member (30), the tool holder (20) is provided with a pull stud hole (22), the pull stud hole (22) communicates with the end with the smallest inner diameter of the tapered hole (21). When the first part (11) abuts against the first tapered surface (211) and the third part (13) is in clearance fit with the second tapered surface (212), applying a driving force to the tapered sleeve (10) in the axial direction of the tapered sleeve (10) to cause the second part (12) to continue to elastically deform to drive the third part (13) to abut against the inner wall of the tapered hole (21) and elastically deform to clamp the tool (200) includes: Controlling the force application connecting member (30) to pass through the pull stud hole (22) and be connected to the third part (13); Pulling the force application connecting member (30) in the axial direction of the tapered sleeve (10) away from the first part (11) to pull the third part (13) to abut against the second tapered surface (212), and the second part (12) applies an elastic force in the axial direction of the tapered sleeve (10) to the first part (11).

15. The tool clamping method for a tool holder assembly according to claim 13, characterized in that, The tool holder assembly (100) further includes: a force application connecting member (30), the force application connecting member (30) is arranged at the end with the largest inner diameter of the tapered hole (21) of the tool holder (20) and abuts against the first part (11) in the axial direction of the tapered sleeve (10). When the third part (13) abuts against the second tapered surface (212) and the first part (11) is in clearance fit with the first tapered surface (211), applying a driving force to the tapered sleeve (10) in the axial direction of the tapered sleeve (10) to cause the second part (12) to continue to elastically deform to drive the first part (11) to abut against the inner wall of the tapered hole (21) and elastically deform to clamp the tool (200) includes: Controlling the force application connecting member (30) to abut against the first part (11); Pushing the force application connecting member (30) in the axial direction of the tapered sleeve (10) towards the third part (13) to push the first part (11) so that the first part (11) abuts against the first tapered surface (211), and the second part (12) applies an elastic force in the axial direction of the tapered sleeve (10) to the third part (13).

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