Cutter clamping assembly

Abstract

According to the tool clamping assembly, the tool bit is inserted into the clamping groove of the collet chuck, the collet chuck is connected to the second internal thread of the connecting piece through the second trapezoidal thread, one end of the fixing screw rod is connected with the first internal thread of the connecting piece through the first trapezoidal thread, and the fixing screw rod is rotated to be tightly engaged with the connecting piece; the collet is driven to move in the length direction of the clamping channel, and finally the collet firmly clamps the tool bit. And the first trapezoidal thread and the second trapezoidal thread provide larger contact area and higher friction force, so that the clamping force of the cutter is enhanced. Due to the trapezoidal thread structure, thread abrasion is reduced, and the durability of the cutter clamping assembly is improved.

Description

Technical Field

[0001] The present application relates to the field of mechanical processing, and in particular to a tool clamping assembly. Background Art

[0002] Most of the existing processing uses CNC numerical control equipment for cutting, grinding, milling and other processing to produce parts that meet the size requirements.

[0003] Before or during machining, the tool needs to be clamped on a tool head fixture to fix the tool so that the motor can drive the tool to rotate to machine the workpiece.

[0004] The existing BT tools adopt a three-stage method in the clamping process: BT tool handle sleeve, fixed screw and collet. During use, the fixed screw is used to penetrate the BT tool handle sleeve and the collet thread to fix it, and the thread used in the collet is metric thread (tapered thread), and the pitch of the metric thread is shorter, resulting in finer thread teeth. After repeated use or excessive force during installation, the thread of the collet will be worn or the teeth will be rotten. During the locking process again (the fixed screw is completely used to pull the collet during use), the thread contact surface between the collet and the fixed screw will slip and get stuck, and the collet cannot be subjected to force and cannot generate sufficient friction, which will cause the collet to be in an active state, resulting in the BT tool head being unable to be locked. The use of an active collet during processing will cause the BT tool head to rotate, resulting in low processing accuracy. Utility Model Content

[0005] In view of this, it is necessary to provide a tool clamping assembly to solve the above problems.

[0006] An embodiment of the present application provides a tool clamping assembly, comprising:

[0007] A fixed screw rod, one end of which is provided with a first trapezoidal thread;

[0008] A connecting piece, with a first internal thread and a second internal thread respectively provided at two ends;

[0009] A collet, one end of which is provided with a clamping groove for clamping a cutter head, and the other end of which is provided with a second trapezoidal thread;

[0010] The first trapezoidal thread is threadedly connected to the first internal thread, and the second trapezoidal thread is threadedly connected to the second internal thread.

[0011] In at least one embodiment of the present application, the pitch of the first trapezoidal thread is the same as that of the second trapezoidal thread, and the pitch range of the first trapezoidal thread is: 4x1mm to 8x1.5mm.

[0012] In at least one embodiment of the present application, the tool clamping assembly further includes:

[0013] A sleeve formed with a fixing channel and a clamping channel communicating with the fixing channel;

[0014] The connecting member is completely received in the clamping channel, and one end of the collet close to the second trapezoidal thread is received in the clamping channel and threadably fixed to the second internal thread;

[0015] One end of the fixing screw rod away from the first trapezoidal thread is received in the fixing passage, and the other end of the fixing screw rod passes through the fixing passage and is threadably connected to the first internal thread.

[0016] In at least one embodiment of the present application, an end of the fixing screw away from the first trapezoidal thread is provided with an adjustment portion connected to an external adjustment member;

[0017] The adjusting portion is rotated to adjust the engagement length of the first trapezoidal thread and the first internal thread, so as to drive the collet to move along the length direction of the clamping channel, so that the collet is accommodated in or extended out of the clamping channel.

[0018] In at least one embodiment of the present application, the connecting member is provided with a limiting groove along the length direction;

[0019] The tool holding assembly further comprises:

[0020] A limiting member is arranged in the clamping channel, and one end of the limiting member is received in the limiting groove to limit the connection member from rotating along the axis of the clamping channel.

[0021] In at least one embodiment of the present application, a limiting hole is provided on the outer circumferential surface of the sleeve, and the axis of the limiting hole is perpendicularly arranged to the axis of the clamping channel;

[0022] One end of the limiting member is received in the limiting hole, and the other end passes through the limiting hole and extends into the limiting groove.

[0023] In at least one embodiment of the present application, a third internal thread is provided on the inner wall of the limiting hole, and a threaded portion is provided on the outer peripheral surface of the limiting member, and the threaded portion is threadedly connected to the third internal thread.

[0024] In at least one embodiment of the present application, a conical clamping portion is provided at one end of the collet away from the second trapezoidal thread, the length of the clamping groove is denoted as a, and the length of the tool head mounting end is denoted as b, satisfying the relationship: a≥0.9b.

[0025] In at least one embodiment of the present application, the clamping portion is provided with a deformation groove along the length direction, one end of the deformation groove is connected to the outside, and the other end is connected to the clamping groove.

[0026] In at least one embodiment of the present application, a conical arc surface is formed at one end of the clamping channel away from the fixing channel, the diameter of the conical arc surface at one end close to the fixing channel is smaller than the diameter of the end away from the fixing channel, and the maximum diameter of one end of the clamping portion close to the second trapezoidal thread is smaller than the maximum diameter of one end away from the second trapezoidal thread;

[0027] The fixing screw is rotated to drive the connecting member to move along the axial direction of the clamping channel, so that the clamping portion abuts against or disengages from the conical arc surface, so as to clamp the tool head in the clamping groove or disengage from the clamping groove.

[0028] Implementing the tool clamping assembly of this embodiment will have at least the following beneficial effects:

[0029] The tool clamping assembly provided above inserts the tool bit into the clamping groove of the collet, connects the collet to the second internal thread of the connecting piece through the second trapezoidal thread, connects one end of the fixing screw to the first internal thread of the connecting piece through the first trapezoidal thread, rotates the fixing screw to make it tightly engage with the connecting piece, drives the collet to move along the length direction of the clamping channel, and finally realizes the collet firmly clamping the tool bit.

[0030] The first trapezoidal thread and the second trapezoidal thread provide a larger contact area and a higher friction force, thereby enhancing the clamping force of the tool.

[0031] The trapezoidal thread structure reduces thread wear and improves the durability of the tool holding assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a tool clamping assembly in one embodiment;

[0033] Figure 2 for Figure 1 Exploded view of the tool holding assembly in;

[0034] Figure 3 for Figure 1 A cross-sectional view of a tool holding assembly in FIG.

[0035] Figure 4 for Figure 2 A schematic diagram of the structure of the connecting parts in FIG.

[0036] Figure 5 for Figure 2 A schematic diagram of the structure of the collet in FIG.

[0037] Figure 6 for Figure 2 A cross-sectional view of the sleeve in FIG.

[0038] Main component symbols

[0039] 100. Tool holding assembly;

[0040] 110. fixing screw; 111. first trapezoidal thread; 112. adjusting portion;

[0041] 120, connecting member; 120a, first internal thread; 120b, second internal thread; 120c, limiting groove;

[0042] 130, collet; 130a, clamping groove; 131, second trapezoidal thread; 132, clamping portion; 132a, deformation groove;

[0043] 140, sleeve; 140a, fixing channel; 140b, clamping channel; 140c, limiting hole; 140d, conical arc surface;

[0044] 150. Limiting member; 151. Threaded portion. DETAILED DESCRIPTION

[0045] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0046] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0047] An embodiment of the present application provides a tool clamping assembly, comprising:

[0048] A fixed screw rod, one end of which is provided with a first trapezoidal thread;

[0049] A connecting piece, with a first internal thread and a second internal thread respectively provided at two ends;

[0050] A collet, one end of which is provided with a clamping groove for clamping a cutter head, and the other end of which is provided with a second trapezoidal thread;

[0051] The first trapezoidal thread is threadedly connected to the first internal thread, and the second trapezoidal thread is threadedly connected to the second internal thread.

[0052] In this embodiment, the tool bit is inserted into the clamping groove of the collet, the collet is connected to the second internal thread of the connecting piece through the second trapezoidal thread, one end of the fixing screw is connected to the first internal thread of the connecting piece through the first trapezoidal thread, and the fixing screw is rotated to make it tightly engage with the connecting piece, driving the collet to move along the length direction of the clamping channel, and finally achieving the collet firmly clamping the tool bit.

[0053] The first trapezoidal thread and the second trapezoidal thread provide a larger contact area and a higher friction force, thereby enhancing the clamping force of the tool.

[0054] The trapezoidal thread structure reduces thread wear and improves the durability of the tool holding assembly.

[0055] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] The embodiment of the present application provides a tool clamping assembly 100, comprising:

[0057] A fixed screw rod 110, one end of which is provided with a first trapezoidal thread 111;

[0058] The connecting member 120 has a first internal thread 120a and a second internal thread 120b at both ends thereof;

[0059] The collet 130 has a clamping groove 130a for clamping the tool head at one end and a second trapezoidal thread 131 at the other end;

[0060] The first trapezoidal thread 111 is threadedly connected to the first internal thread 120 a , and the second trapezoidal thread 131 is threadedly connected to the second internal thread 120 b .

[0061] Please refer to Figure 1-Figure 3 In this embodiment, the tool bit is inserted into the clamping groove 130a of the collet 130, and the collet 130 is connected to the second internal thread 120b of the connecting member 120 through the second trapezoidal thread 131. One end of the fixing screw 110 is connected to the first internal thread 120a of the connecting member 120 through the first trapezoidal thread 111. The fixing screw 110 is rotated to make it tightly engage with the connecting member 120, driving the collet 130 to move along the length direction of the clamping channel 140b, and finally achieving the collet 130 firmly clamping the tool bit.

[0062] The first trapezoidal thread 111 and the second trapezoidal thread 131 provide a larger contact area and a higher friction force, thereby enhancing the clamping force of the tool.

[0063] The trapezoidal thread structure reduces thread wear and improves the durability of the tool holding assembly 100 .

[0064] It should be noted that the fixing screw rod 110 is a long rod, one end of which is provided with a first trapezoidal thread 111 .

[0065] The first trapezoidal thread 111 has a larger contact area and better wear resistance than a conventional metric thread, can withstand a greater torque, and reduces the risk of thread wear and slippage, thereby improving the stability and durability of clamping.

[0066] The connecting member 120 is a rod-shaped structure, and a first internal thread 120a and a second internal thread 120b are respectively provided at two ends thereof.

[0067] The connector 120 can be threadedly connected to the fixing screw 110 and the collet 130 at the same time, thereby ensuring a tight connection of the entire assembly, providing a stable support, and avoiding loosening and displacement.

[0068] The collet 130 is a component used to fix the tool, and has a substantially cylindrical shape. One end of the collet 130 is provided with a clamping groove 130 a for clamping the tool head, and the other end is provided with a second trapezoidal thread 131 .

[0069] The clamping groove 130a ensures that the tool bit can be firmly fixed in the collet 130, while the use of the trapezoidal thread enhances the stability and durability of the threaded connection and reduces the possibility of loosening and wear.

[0070] The clamping groove 130a has a substantially conical outer shape.

[0071] The first trapezoidal thread 111 of the fixing screw 110 is connected to the first internal thread 120 a of the connecting member 120 , and the second trapezoidal thread 131 of the collet 130 is connected to the second internal thread 120 b of the connecting member 120 .

[0072] The threaded connection ensures a tight fit between the components, reduces loosening and displacement of components during use, and provides higher clamping force and stability.

[0073] In at least one embodiment of the present application, the first trapezoidal thread 111 and the second trapezoidal thread 131 have the same pitch, and the pitch range of the first trapezoidal thread 111 is: 4x1mm to 8x1.5mm.

[0074] Please refer to Figure 1-Figure 6 In this embodiment, the first trapezoidal thread 111 of the fixing screw 110 is threadedly connected with the first internal thread 120a of the connecting member 120. Since the pitches of the two threads are the same, the connection process is smooth and firm.

[0075] The second trapezoidal thread 131 of the collet 130 is threadedly connected to the second internal thread 120b of the connector 120. Also, due to the same pitch, the connector 120 can evenly distribute stress, thus avoiding unstable connection caused by mismatched threads.

[0076] By rotating the fixing screw 110 , the engagement length between the trapezoidal thread and the internal thread can be adjusted, thereby adjusting the position and clamping force of the collet 130 in the clamping channel 140 b so that the tool head can be firmly clamped in the collet 130 .

[0077] This ensures that the connection between the fixing screw 110 and the collet 130 and the connecting member 120 is more stable, and reduces the looseness and wear problems caused by thread mismatch.

[0078] The larger contact area and higher friction of the first trapezoidal thread 111 and the second trapezoidal thread 131 enable the threaded connection to withstand greater torque and tension, thereby improving the durability and clamping force of the entire clamping assembly. At the same time, the wear and loosening of the threads are reduced, the service life of the clamping assembly is extended, and the stability and precision during the processing are improved.

[0079] The pitch range of the first trapezoidal thread 111 is: 4x1mm to 8x1.5mm. The trapezoidal thread in this pitch range can provide a larger contact area and higher friction, which helps to improve the fastening effect and durability of the threaded connection. Different pitch ranges also provide users with choices to adapt to different usage requirements and working conditions.

[0080] The pitch of the first trapezoidal thread 111 can be: 4x1mm, 4x1.5mm, 6x1mm, 6x1.5mm, 8x1mm, 8x1.5mm. In the present embodiment, the pitch of the first trapezoidal thread 111 is 6x1.5mm.

[0081] In at least one embodiment of the present application, the tool clamping assembly 100 further includes:

[0082] The sleeve 140 is formed with a fixing channel 140a and a clamping channel 140b communicating with the fixing channel 140a;

[0083] The connecting member is completely received in the clamping channel 140b, and one end of the collet 130 close to the second trapezoidal thread 131 is received in the clamping channel 140b and is threadedly fixed with the second internal thread 120b;

[0084] One end of the fixing screw 110 away from the first trapezoidal thread 111 is received in the fixing channel 140 a , and the other end thereof passes through the fixing channel 140 a and is threadedly connected to the first internal thread 120 a .

[0085] Please refer to Figure 1-Figure 6In this embodiment, the connector is fully inserted into the clamping channel 140b, and then the end of the collet 130 close to the second trapezoidal thread 131 is inserted into the clamping channel 140b, and is threadedly fixed to the second internal thread 120b through the second trapezoidal thread 131.

[0086] One end of the fixing screw 110 away from the first trapezoidal thread 111 is inserted into the fixing channel 140 a , and the other end passes through the fixing channel 140 a and is threadedly connected with the first internal thread 120 a .

[0087] The fixing screw 110 is rotated to push or pull the connecting member 120, thereby adjusting the position of the collet 130 in the clamping channel 140b to achieve a firm clamping of the tool head.

[0088] The sleeve 140 is mounted on a machine tool or a clamping device to ensure that the fixing channel 140a and the clamping channel 140b are connected and aligned.

[0089] The fixing and threaded connection of the connector and the collet 130 in the sleeve 140 ensures stability and reliability during the clamping process and improves the clamping force on the tool.

[0090] One end of the collet 130 close to the second trapezoidal thread 131 is received in the clamping channel 140b and is threadedly fixed to the second internal thread 120b, thereby ensuring the stability of the collet 130 in the clamping channel 140b, preventing the collet 130 from moving during use, and improving the stability and accuracy of tool clamping.

[0091] One end of the fixing screw 110 away from the first trapezoidal thread 111 is received in the fixing channel 140a, and the other end passes through the fixing channel 140a and is threadedly connected to the first internal thread 120a, so that the fixing screw 110 can stably push or pull the connecting member 120 when rotating, ensuring the reliability of the threaded connection and the smoothness of the operation.

[0092] The sleeve 140 is tubular, and the diameter of the fixing channel 140a is larger than the diameter of the connection between the clamping channel 140b and the fixing channel 140a.

[0093] In at least one embodiment of the present application, an end of the fixing screw 110 away from the first trapezoidal thread 111 is provided with an adjusting portion 112 connected to an external adjusting member;

[0094] The adjusting portion 112 is rotated to adjust the engagement length between the first trapezoidal thread 111 and the first internal thread 120a, so as to drive the collet 130 to move along the length direction of the clamping channel 140b, so that the collet 130 is received in or extended out of the clamping channel 140b.

[0095] Please refer to Figure 1-Figure 6In this embodiment, the external adjustment member is connected to the adjustment portion 112 of the fixed screw 110. By rotating the adjustment member, the fixed screw 110 is rotated. The rotation of the fixed screw 110 changes the engagement length between the first trapezoidal thread 111 and the first internal thread 120a.

[0096] Due to the change in the engagement length, the fixing screw 110 drives the collet 130 to move along the length direction of the clamping channel 140b.

[0097] As required, the collet 130 is received in the clamping channel 140 b or extended from the clamping channel 140 b to achieve effective clamping or release of the tool.

[0098] The connection between the adjusting portion 112 and the external adjusting member enables the operator to conveniently adjust the positions of the fixing screw 110 and the collet 130 , thereby simplifying the operation steps.

[0099] By adjusting the thread engagement length, the position of the collet 130 can be precisely controlled to ensure stable clamping of the tool and improve processing accuracy.

[0100] A hexagonal groove is formed on the adjusting portion 112 . The diameter of the adjusting portion 112 is larger than the diameter of the connection between the fixing channel 140 a and the clamping channel 140 b . The adjusting piece is a hexagonal wrench.

[0101] In at least one embodiment of the present application, the connecting member is provided with a limiting groove 120c along the length direction;

[0102] The tool holding assembly 100 further includes:

[0103] The limiting member 150 is disposed in the clamping channel 140b, and one end of the limiting member is received in the limiting groove 120c to limit the connection member from rotating along the axis of the clamping channel 140b.

[0104] In at least one embodiment of the present application, a limiting hole 140c is provided on the outer circumferential surface of the sleeve 140, and the axis of the limiting hole 140c is perpendicularly arranged to the axis of the clamping channel 140b;

[0105] One end of the limiting member 150 is received in the limiting hole 140c, and the other end passes through the limiting hole 140c and extends into the limiting groove 120c.

[0106] Please refer to Figure 1-Figure 6 In this embodiment, the connecting member is provided with a limiting groove 120c in its length direction, ready to be placed in the clamping channel 140b.

[0107] The limiting member 150 is installed in the clamping channel 140b, so that one end of the limiting member 150 is received in the limiting groove 120c of the connecting member and the other end is fixed to the outer peripheral surface of the sleeve 140 through the limiting hole 140c.

[0108] The limiting member 150 fixes the position of the connecting member by combining the limiting hole 140c with the limiting groove 120c, thereby limiting the rotation of the connecting member along the axis direction of the clamping channel 140b.

[0109] In actual use, the limiter 150 ensures that the connector remains stable in the clamping channel 140b, avoiding rotation and deviation, so as to prevent the tool from rotating and improve the operation accuracy and stability.

[0110] The limiting member 150 improves the operating accuracy of the overall device by limiting the rotation of the connecting member, ensuring the accurate positioning of the tool during the clamping process, thereby improving the processing quality.

[0111] One end of the limiting member 150 is received in the limiting hole 140c, and the other end passes through the limiting hole 140c and extends into the limiting groove 120c. The limiting member 150 effectively limits the rotation of the connecting member through the combination of the limiting hole 140c and the limiting groove 120c, thereby ensuring the correct position and stability of the connecting member in the fixed channel 140a and preventing displacement or loosening during operation.

[0112] The limiting member 150 is cylindrical, the limiting hole 140c is a circular through hole, and the limiting groove 120c is a strip-shaped groove.

[0113] In at least one embodiment of the present application, a third internal thread is provided on the inner wall of the limiting hole 140c, and a threaded portion 151 is provided on the outer peripheral surface of the limiting member 150, and the threaded portion 151 is threadedly connected to the third internal thread.

[0114] Please refer to Figure 1-Figure 6 In this embodiment, a limiting hole 140c is opened on the outer circumferential surface of the sleeve 140, and a third internal thread is processed on the inner wall of the limiting hole 140c.

[0115] A threaded portion 151 matching the third internal thread is provided on the outer peripheral surface of the stopper 150.

[0116] The limiting member 150 is aligned with the limiting hole 140c, and the threaded portion 151 of the limiting member 150 is threadedly connected with a third internal thread (not shown in the figure) in the limiting hole 140c by rotation.

[0117] The limiting member 150 is continuously rotated until it is firmly fixed in the limiting hole 140c and one end of the limiting member 150 enters the limiting groove 120c.

[0118] During the operation of the tool clamping assembly 100, the limiting member 150 is fixed in the limiting hole 140c by means of its threaded connection, which effectively limits the axial rotation of the connecting member, ensures the stability of the connecting member, and limits the self-rotation of the connecting member.

[0119] In at least one embodiment of the present application, a conical clamping portion 132 is provided at one end of the collet 130 away from the second trapezoidal thread 131 , the length of the clamping groove 130a is denoted as a, and the length of the tool head mounting end is denoted as b, satisfying the relationship: a≥0.9b.

[0120] Please refer to Figure 1-Figure 6 In this embodiment, the tool bit is inserted into the conical clamping portion 132 of the collet 130 so that the mounting end of the tool bit completely enters the clamping groove 130a.

[0121] Since the length (a) of the clamping groove 130a is greater than or equal to 90% of the length (b) of the tool bit mounting end, the tool bit can be firmly clamped.

[0122] The conical clamping portion 132 firmly fixes the cutter head in the collet 130 through a uniform clamping force, thereby avoiding local stress concentration.

[0123] The clamping groove 130a ensures that the mounting end of the cutter head can fully contact the clamping portion 132, providing sufficient clamping force to prevent the cutter head from loosening during operation.

[0124] The length of the clamping groove 130a is greater than or equal to 90% of the length of the installation end of the cutter head, ensuring that the cutter head can be fully clamped to prevent loosening or falling off, thereby enhancing the safety of use.

[0125] The firm clamping force ensures the stability of the cutter head during operation, avoids shaking or displacement of the cutter head, and improves the processing accuracy.

[0126] By setting a conical clamping portion 132 at one end of the collet 130 away from the second trapezoidal thread 131 and ensuring that the length of the clamping groove 130a satisfies a≥0.9b, a uniform and stable clamping method is provided, which significantly improves the stability, safety and precision of the tool clamping assembly 100.

[0127] The tool bit is inserted into the conical clamping portion 132 of the collet 130 so that the mounting end of the tool bit completely enters the clamping groove 130a.

[0128] Since the length (a) of the clamping groove 130a is greater than or equal to 90% of the length (b) of the tool bit mounting end, the tool bit can be firmly clamped.

[0129] In at least one embodiment of the present application, the clamping portion 132 is provided with a deformation groove 132a along the length direction, one end of the deformation groove 132a is connected to the outside, and the other end is connected to the clamping groove 130a.

[0130] Please refer to Figure 1-Figure 6 In this embodiment, the cutter head is inserted into the clamping groove 130a of the collet 130 so that the mounting end of the cutter head completely enters the clamping groove 130a.

[0131] Since the clamping portion 132 is provided with a deformation groove 132 a along the length direction, the clamping portion 132 can generate appropriate elastic deformation.

[0132] Under the action of external force, the clamping portion 132 generates elastic deformation in the deformation groove 132a, and the clamping groove 130a closely fits the mounting end of the cutter head to provide uniform clamping force.

[0133] Since one end of the deformation groove 132a is connected to the outside and the other end is connected to the clamping groove 130a, it is ensured that the elastic deformation of the clamping portion 132 can effectively transmit and distribute the pressure, thereby improving the clamping effect.

[0134] The deformation groove 132a makes the clamping portion 132 elastic, and can provide a greater clamping force when clamping the cutter head, ensuring that the cutter head will not loosen during operation.

[0135] The deformation groove 132a provides an appropriate elastic buffer to prevent the clamping portion 132 from exerting excessive pressure on the cutter head, thereby preventing damage to the cutter head and extending the service life of the cutter.

[0136] The deformation groove 132a is a strip-shaped through groove.

[0137] In at least one embodiment of the present application, a conical arc surface 140d is formed at one end of the clamping channel 140b away from the fixed channel 140a, and the diameter of the conical arc surface 140d at one end close to the fixed channel 140a is smaller than the diameter of the end away from the fixed channel 140a, and the maximum diameter of the end of the clamping portion 132 close to the second trapezoidal thread 131 is smaller than the maximum diameter of the end away from the second trapezoidal thread 131;

[0138] The fixing screw 110 rotates to drive the connecting member 120 to move along the axial direction of the clamping channel 140b, so that the clamping portion 132 abuts against or disengages from the conical arc surface 140d, so as to clamp the tool head in the clamping groove 130a or disengage from the clamping groove 130a.

[0139] Please refer to Figure 1-Figure 6 In this embodiment, the cutter head is inserted into the clamping groove 130a of the collet 130 so that the mounting end of the cutter head completely enters the clamping groove 130a.

[0140] The maximum diameter of one end of the clamping portion 132 close to the second trapezoidal thread 131 is smaller, and can be smoothly inserted into the clamping channel 140b.

[0141] By rotating the fixing screw 110 , the connecting member 120 moves along the axial direction of the clamping channel 140 b .

[0142] When the connecting member 120 drives the clamping portion 132 to move, the clamping portion 132 gradually enters the conical arc surface 140d, is subjected to an increased clamping force, and finally the tool head is firmly clamped in the clamping groove 130a.

[0143] When the cutter head is released, the fixing screw 110 is rotated in the reverse direction so that the connecting member 120 drives the clamping portion 132 away from the conical arc surface 140d.

[0144] The clamping portion 132 gradually separates from the conical arc surface 140d, the clamping force decreases, and the tool bit can be released from the clamping groove 130a.

[0145] The conical arc surface 140d provides a gradually increasing clamping force, ensuring that the tool head can be firmly clamped in the clamping groove 130a, thereby improving the stability and precision during the processing.

[0146] The cutter head can be clamped and released by rotating the fixing screw 110, which is simple and convenient to operate and reduces the complexity of operation.

[0147] The gradual contact between the tapered arc surface 140d and the clamping portion 132 reduces wear, prolongs the service life of the clamping assembly, and improves the durability of the device.

[0148] Rotating the fixing screw 110 can accurately control the position of the clamping portion 132, thereby achieving flexible adjustment of the clamping force to meet different processing requirements.

[0149] A conical arc surface 140d is formed at one end of the clamping channel 140b away from the fixing channel 140a, providing a gradually shrinking channel, so that the clamping portion 132 can gradually receive a uniform clamping force during the movement, thereby improving the stability and accuracy of the clamping.

[0150] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the creative concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. A tool clamping assembly, characterized in that: include: A fixed screw rod, one end of which is provided with a first trapezoidal thread; A connecting piece, with a first internal thread and a second internal thread respectively provided at two ends; A collet, one end of which is provided with a clamping groove for clamping a cutter head, and the other end of which is provided with a second trapezoidal thread; The first trapezoidal thread is threadedly connected to the first internal thread, and the second trapezoidal thread is threadedly connected to the second internal thread.

2. The tool holding assembly according to claim 1, characterized in that: The first trapezoidal thread and the second trapezoidal thread have the same pitch, and the pitch range of the first trapezoidal thread is: 4x1mm to 8x1.5mm.

3. The tool holding assembly according to claim 1, characterized in that: The tool holding assembly further comprises: A sleeve formed with a fixing channel and a clamping channel communicating with the fixing channel; The connecting member is completely received in the clamping channel, and one end of the collet close to the second trapezoidal thread is received in the clamping channel and threadably fixed to the second internal thread; One end of the fixing screw rod away from the first trapezoidal thread is received in the fixing passage, and the other end of the fixing screw rod passes through the fixing passage and is threadably connected to the first internal thread.

4. The tool holding assembly according to claim 3, characterized in that: An end of the fixing screw away from the first trapezoidal thread is provided with an adjusting portion connected to an external adjusting member; The adjusting portion is rotated to adjust the engagement length of the first trapezoidal thread and the first internal thread, so as to drive the collet to move along the length direction of the clamping channel, so that the collet is accommodated in or extended out of the clamping channel.

5. The tool holding assembly according to claim 4, characterized in that: The connecting piece is provided with a limiting groove along the length direction; The tool holding assembly further comprises: A limiting member is arranged in the clamping channel, and one end of the limiting member is received in the limiting groove to limit the connection member from rotating along the axis of the clamping channel.

6. The tool holding assembly according to claim 5, characterized in that: The outer circumferential surface of the sleeve is provided with a limiting hole, and the axis of the limiting hole is arranged perpendicular to the axis of the clamping channel; One end of the limiting member is received in the limiting hole, and the other end passes through the limiting hole and extends into the limiting groove.

7. The tool holding assembly according to claim 6, characterized in that: A third internal thread is provided on the inner wall of the limiting hole, and a threaded portion is provided on the outer peripheral surface of the limiting member, and the threaded portion is threadedly connected to the third internal thread.

8. The tool holding assembly according to claim 3, characterized in that: A conical clamping portion is provided at one end of the collet away from the second trapezoidal thread, the length of the clamping groove is denoted as a, and the length of the tool head mounting end is denoted as b, satisfying the relationship: a≥0.9b.

9. The tool holding assembly according to claim 8, characterized in that: The clamping portion is provided with a deformation groove along the length direction, one end of the deformation groove is connected to the outside, and the other end is connected to the clamping groove.

10. The tool holding assembly according to claim 9, characterized in that: A conical arc surface is formed at one end of the clamping channel away from the fixing channel, the diameter of the conical arc surface at one end close to the fixing channel is smaller than the diameter of the end away from the fixing channel, and the maximum diameter of one end of the clamping portion close to the second trapezoidal thread is smaller than the maximum diameter of one end away from the second trapezoidal thread; The fixing screw is rotated to drive the connecting member to move along the axial direction of the clamping channel, so that the clamping portion abuts against or disengages from the conical arc surface, so as to clamp the tool head in the clamping groove or disengage from the clamping groove.

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