Anti-loosening tool clamp assembly

Abstract

The present invention relates to the technical field of milling tools, and more particularly to an anti-loosening tool clamping assembly. The outer wall at one end of the tool handle is provided with a first thread, the inner wall of the screw cap is provided with a second thread corresponding to the first thread and a tightening protrusion located above the second thread, the tightening protrusion abuts against the outer wall of the tool handle to form an interference fit, and the outer wall on the upper end of the elastic chuck is provided with a conical surface, the conical surface fits against the upper end of the inner wall of the screw cap. The tightening protrusion is cleverly arranged to have an interference fit with the side wall of the tool handle. When the tool vibrates, most of the vibration will be directly transmitted and output through the tool handle due to the interference fit there, which efficiently and cost-effectively solves the problem of the screw cap loosening due to vibration.

Description

Technical Field

[0001] The invention relates to the technical field of milling cutters, in particular to an anti-loosening cutter clamping component. Background Art

[0002] The tool holding components used in CNC machine tool processing are generally conventional tool holder systems on the market. This type of tool holder is generally formed by the combination of a tool holder body, an elastic collet and a screw cap. In actual use, the tool is first inserted into the elastic collet and then installed into the tool holder, and then the screw cap is tightened. After the combination is completed, the end of the tool holder is aligned with the mounting hole on the CNC machine tool spindle and inserted for use. In the process of CNC processing with this type of tool holder, especially when performing heavy-duty processing, the tool will generate high-frequency vibrations. Most of these vibrations will be transmitted to the screw cap through the elastic collet. The screw cap receives most of the vibrations, which will cause the thread connected to the tool holder to move, and eventually cause the screw cap to loosen. When the screw cap is loose, the force pressing the elastic collet will disappear, and the tool will also become loose. If the operator does not observe carefully in daily processing, it is difficult to find it. Therefore, it is basically when the tool breaks or hits the machine that the operator can find the abnormality, but it is too late. If the collision is serious, it will inevitably affect the subsequent processing accuracy of the machine tool, causing serious losses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anti-loosening tool clamping assembly, which adopts a clever arrangement of a tightening convex portion and an interference fit with the side wall of the tool handle. When the tool vibrates, most of the vibration will be directly transmitted and output through the tool handle due to the interference fit at that location, thereby efficiently and cost-effectively solving the problem of loosening of the screw cap due to vibration.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: an anti-loosening tool clamping assembly, comprising a tool handle, an elastic collet installed at one end of the tool handle and a nut cover, wherein the elastic collet is inserted into the tool handle, the nut cover is sleeved on the tool handle and presses the elastic collet, the outer side wall of one end of the tool handle is provided with a first thread, the inner side wall of the nut cover is provided with a second thread corresponding to the first thread and a tightening protrusion located above the second thread, the tightening protrusion abuts against the outer side wall of the tool handle to form an interference fit, the outer side wall of the upper end of the elastic collet is provided with a conical surface, and the conical surface fits against the upper end of the inner side wall of the nut cover.

[0005] Preferably, the abutting protrusion abuts against the outer side wall at the end of the handle.

[0006] Preferably, the circle formed by the outer wall at the end of the handle and the circle formed by the front side of the abutting protrusion are concentric circles, the distance between the outer wall at the end of the handle and the center of the circle is N, and the distance between the front side of the abutting protrusion and the center of the circle is N-0.05 to 0.25 mm.

[0007] Preferably, the front side surface of the abutting protrusion abuts against the outer side wall at the end of the knife handle, and 50% to 80% of the area of ​​the front side surface overlaps with the outer side wall of the knife handle.

[0008] Preferably, the vertical spacing distance between the abutting protrusion and the second thread is 1.5 to 6 mm.

[0009] Preferably, the inner angle between the conical surface and the horizontal plane is 100 to 160 degrees.

[0010] Preferably, a sealing member is sleeved on the outer side wall of one end of the knife handle corresponding to the screw cover, and the sealing member abuts against the inner side wall of the screw cover.

[0011] Preferably, the outer wall of one end of the knife handle corresponding to the screw cap is provided with a clamping groove for inserting a sealing member, and the sealing member is made of a soft material, and the sealing member abuts against the end portion of the inner wall of the screw cap.

[0012] The beneficial effects of the present invention are: providing an anti-loosening tool clamping assembly, the structure of the tool handle, elastic collet and screw cap of the present application is roughly the same as the tool handle, elastic collet and screw cap commonly used in the market, and the actual use assembly process is also similar, first insert the tool into the elastic collet, then load it into the opening at one end of the tool handle, then put the screw cap on the tool handle and tighten it down to fix it with the elastic collet. In the assembly process, when the screw cap is tightened and pressed down to fix the elastic collet in the tool handle, the tight convex part of the inner side wall of the screw cap will abut the outer side wall of the tool handle and form an interference fit, and this interference fit adopts a micro-interference fit, and when the vibration is transmitted to the tool handle, it will not be difficult to tighten and install, so as to achieve a low-cost and efficient solution to the problem of the screw cap loosening due to vibration. The present application does not follow the conventional prejudice of solving the technical problem, that is, directly adding anti-vibration materials or reinforcing the installation of the screw cap, but transmits the vibration through a clever interference design, which truly achieves a low-cost and high-efficiency solution to the problem, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0014] Figure 2 It is a schematic cross-sectional view of the side structure of the present invention.

[0015] Figure 3 for Figure 2 A schematic diagram of the enlarged local structure of part A.

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure decomposition of the knife handle, the seal, the elastic collet and the screw cover in the present invention. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0018] like Figures 1 to 4 As shown, an anti-loosening tool clamping assembly includes a tool handle 1, an elastic collet 2 and a screw cover 3 installed at one end of the tool handle 1, wherein the elastic collet 2 is inserted into the tool handle 1, and the screw cover 3 is mounted on the tool handle 1 and presses the elastic collet 2 to be set, the outer side wall of one end of the tool handle 1 is provided with a first thread 11, the inner side wall of the screw cover 3 is provided with a second thread 31 corresponding to the first thread 11 and a tightening protrusion 32 located above the second thread 31, the tightening protrusion 32 abuts against the outer side wall of the tool handle 1 to form an interference fit, and the outer side wall of the upper end of the elastic collet 2 is provided with a conical surface 21, and the conical surface 21 fits against the upper end of the inner side wall of the screw cover 3.

[0019] The anti-loosening tool clamping assembly of the present embodiment, the structure of the knife handle 1, the elastic collet 2 and the screw cap 3 of the present application is roughly the same as that of the knife handle 1, the elastic collet 2 and the screw cap 3 commonly used in the market, and the actual use assembly process is also similar, first insert the tool into the elastic collet 2, then load it into the opening at one end of the knife handle 1, and then the screw cap 3 is put on the knife handle 1 and tightened and pressed down to the elastic collet 2 to fix it. In this assembly process, when the screw cap 3 is tightened and pressed down to fix the elastic collet 2 in the knife handle 1, the abutting convex part 32 of the inner side wall of the screw cap 3 will abut the outer side wall of the knife handle 1 and form an interference fit, and this interference fit adopts a micro-interference fit, and when the vibration is transmitted to the knife handle 1, it will not be difficult to tighten and install, so as to achieve a low-cost and efficient solution to the problem of the screw cap 3 loosening, and the present application does not follow the conventional prejudice of solving the technical problem, that is, directly adding anti-vibration materials or reinforcing the installation of the screw cap 3, but transmits the vibration through a clever interference design, and truly achieves a low-cost and high-efficiency solution to the problem, and has strong practicality.

[0020] In this embodiment, the abutting protrusion 32 abuts against the outer wall at the end of the tool handle 1. The interference fit position is set at the end of the tool handle 1, closer to the front end of the tool, so as to timely and efficiently transmit the vibration force transmitted from the elastic collet 2 to the screw cap 3 to the tool handle 1, and then output from the tool handle 1, preventing the vibration from being transmitted to the second thread 31 of the screw cap 3.

[0021] In this embodiment, the circle formed by the outer wall at the end of the handle 1 and the circle formed by the front side of the pressing protrusion 32 are concentric circles, the distance between the outer wall at the end of the handle 1 and the center of the circle is N, and the distance between the front side of the pressing protrusion 32 and the center of the circle is N-0.05 to 0.25 mm. The screw cap 3 is mounted on the handle 1, so the center of the outer wall of the handle 1 must be the same as the center of the screw cap 3, and the front side of the pressing protrusion 32 will be closer to the center of the circle than the outer wall at the end of the handle 1, and the value of N-0.05 to 0.25 mm reflects the interference fit of the pressing protrusion 32. The interference fit effect achieved within this numerical range is the best, which is the value obtained by the applicant through multiple tests. The interference achieved within this numerical range can effectively transmit vibration to the handle 1 while not making the screw cap 3 too difficult to install.

[0022] In this embodiment, the front side of the abutting protrusion 32 abuts against the outer wall of the end of the knife handle 1, and 50% to 80% of the area of ​​the front side overlaps with the outer wall of the knife handle 1. The front side of the abutting protrusion 32 does not completely fit the outer wall of the end of the knife handle 1. This design helps to reduce the difficulty of installing and removing the screw cover 3, and is convenient for daily replacement of knives. At the same time, the contact area within this percentage range has achieved the desired interference fit effect, that is, the vibration transmission effect.

[0023] In this embodiment, the vertical spacing distance between the abutting protrusion 32 and the second thread 31 is 1.5 to 6 mm. Within this vertical spacing distance range, the best effect of preventing vibration from being transmitted to the second thread 31 can be achieved, and the transmission effect of the interference fit will not be affected due to being too close, and the original structural layout will not be affected due to being too far. The problem is solved at a low cost and is highly practical.

[0024] In this embodiment, the inner angle between the conical surface 21 and the horizontal plane is 100 to 160 degrees. The angle of the conical surface 21 of the outer wall of the upper end of the elastic chuck 2 is set within this range to cooperate with the fitting and pressing setting of the upper end of the inner wall of the screw cap 3 to achieve a better pressing and fixing effect, and prevent the situation that the upper end of the elastic chuck 2 opens more when the screw cap 3 is pressed down more.

[0025] In this embodiment, the outer wall of one end of the handle 1 corresponding to the screw cap 3 is provided with a seal 12, and the seal 12 abuts against the inner wall of the screw cap 3. The outer wall of one end of the handle 1 corresponding to the screw cap 3 is provided with a clamping groove 13 for inserting the seal 12, and the seal 12 is made of soft material, and the seal 12 abuts against the end of the inner wall of the screw cap 3. The seal 12 made of soft material can be a plastic sealing ring on the market, and this setting effectively realizes the sealing effect after the screw cap 3 and the handle 1 are assembled, achieving the dual effects of water stopping and slag prevention.

[0026] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An anti-loosening tool clamping assembly, comprising a tool handle (1), an elastic collet (2) mounted on one end of the tool handle (1), and a screw cover (3), wherein the elastic collet (2) is inserted into the tool handle (1), and the screw cover (3) is sleeved on the tool handle (1) and presses the elastic collet (2), characterized in that: The outer wall of one end of the knife handle (1) is provided with a first thread (11), the inner wall of the screw cap (3) is provided with a second thread (31) corresponding to the first thread (11) and a tightening protrusion (32) located above the second thread (31), the tightening protrusion (32) abuts against the outer wall of the knife handle (1) to form an interference fit, and the outer wall of the upper end of the elastic chuck (2) is provided with a conical surface (21), and the conical surface (21) abuts against the upper end of the inner wall of the screw cap (3).

2. The anti-loosening tool clamping assembly according to claim 1, characterized in that: The abutting protrusion (32) abuts against the outer side wall at the end of the knife handle (1).

3. The anti-loosening tool clamping assembly according to claim 1, characterized in that: The circle formed by the outer wall at the end of the knife handle (1) and the circle formed by the front side of the abutting protrusion (32) are concentric circles. The distance between the outer wall at the end of the knife handle (1) and the center of the circle is N, and the distance between the front side of the abutting protrusion (32) and the center of the circle is N-0.05 to 0.25 mm.

4. The anti-loosening tool clamping assembly according to claim 1, characterized in that: The front side surface of the abutting protrusion (32) abuts against the outer side wall at the end of the knife handle (1), and 50% to 80% of the area of ​​the front side surface of the abutting protrusion (32) overlaps with the outer side wall at the end of the knife handle (1).

5. The anti-loosening tool clamping assembly according to claim 1, characterized in that: The vertical spacing distance between the abutting protrusion (32) and the second thread (31) is 1.5 to 6 millimeters.

6. The anti-loosening tool clamping assembly according to claim 1, characterized in that: The inner angle between the conical surface (21) and the horizontal plane is 100 to 160 degrees.

7. The anti-loosening tool clamping assembly according to claim 1, characterized in that: A sealing member (12) is sleeved on the outer side wall of one end of the knife handle (1) corresponding to the screw cover (3), and the sealing member (12) abuts against the inner side wall of the screw cover (3).

8. The anti-loosening tool clamping assembly according to claim 7, characterized in that: The outer side wall of one end of the knife handle (1) corresponding to the screw cover (3) is provided with a clamping groove (13) for receiving a sealing member (12). The sealing member (12) is made of a soft material, and the sealing member (12) abuts against the inner side wall of the end portion of the screw cover (3).

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