Shock absorbing knife bar device
By using clamping components and outer rings made of engineering plastics, the problem of tool vibration being transmitted to the spindle assembly was solved, resulting in reduced maintenance and material costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EVERINN INT
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-29
AI Technical Summary
In existing tool holder devices, after the clamping component is tightened, the force of the tool is transmitted to the spindle device, causing the spindle device components to shift or be damaged. This results in high and complicated maintenance costs, and the replacement cost of the clamping component is also high.
The clamping components and outer rings are made of engineering plastics, and the vibration transmission is reduced by the water-proof unit. The use of nylon with glass fiber or polyoxymethylene materials reduces material and processing costs.
Reduce damage to the spindle assembly, lower maintenance and material costs, simplify the repair process, and reduce the cost of replacing clamping parts.
Smart Images
Figure CN224295266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a tool holder, and more particularly to a shock-absorbing tool holder device. Background Technology
[0002] Generally, existing tool holder devices are made of high-strength steel, consisting of a tool holder for mounting on a spindle, a collet for holding the tool, and a clamping member screwed onto the tool holder and capable of pushing against the collet. By operating the clamping member, the collet is pushed deeper into the tool holder, and the tool holder provides clamping force to hold the tool by clamping the collet.
[0003] However, after the clamping member is tightened, the clamping member, the cutting tool, the tool holder, and the spindle assembly form a tight structure. The force on the cutting tool is reliably transmitted to the spindle assembly. As a crucial component of the machining center, the spindle assembly has extremely high precision requirements, resulting in high processing and maintenance costs. Furthermore, the clamping member, made of high-strength steel, is not only expensive to manufacture but also has high structural strength. Therefore, if the cutting tool collidees due to improper operation, the force transmitted to the spindle assembly through the clamping member is significant, which could potentially cause component displacement or damage to the spindle assembly. Moreover, since the disassembly and assembly of the spindle assembly affects numerous other components, the maintenance process for the spindle assembly is also very complex. In addition, replacing the clamping member itself is also very costly. Therefore, there is still room for improvement in reducing maintenance costs. Utility Model Content
[0004] The purpose of this invention is to provide a shock-absorbing tool holder device that can reduce maintenance costs.
[0005] The shock-absorbing tool holder device of this utility model is suitable for being installed on a spindle device and clamping a tool. The shock-absorbing tool holder device includes a tool holder, a clamping member, a pressing member, and an outer ring.
[0006] The tool holder extends along an axis and includes a chuck section and a tool section arranged opposite to each other along the axis, and a gripping section connected between the chuck section and the tool section, the chuck section being adapted for clamping by the spindle assembly.
[0007] The clamping member is disposed on the tool section and is suitable for clamping the tool.
[0008] The clamping member is movably disposed and positioned on the tool section along the extension direction of the axis, through which the tool passes and to push the clamping member toward the chuck section, the clamping member being made of engineering plastic.
[0009] The outer ring is disposed on the gripping section for clamping and is made of engineering plastic.
[0010] The shock-absorbing tool holder device of this utility model includes a clamping member comprising a base wall and a surrounding wall extending from the outer periphery of the base wall along the extension direction of the axis. The base wall has a through hole that passes through the axis and allows the tool to pass through. The surrounding wall is positioned on the tool segment.
[0011] The shock-absorbing tool holder device of this utility model further includes a water-proof unit disposed on the clamping member, and the base wall also has a waterproof groove surrounding the axis and communicating with the through hole. The water-proof unit includes a first barrier member disposed on the waterproof groove and used to prevent fluid from passing between the clamping member and the tool.
[0012] The shock-absorbing tool holder of this utility model further includes a second barrier member surrounding the axis and disposed between the clamping member and the enclosure wall. The second barrier member is used to prevent fluid from passing between the clamping member and the enclosure wall.
[0013] The shock-absorbing tool holder of this utility model has a clamping member made of nylon and glass fiber or polyoxymethylene, and an outer ring made of nylon and glass fiber or polyoxymethylene.
[0014] The shock-absorbing tool holder of this utility model has a clamping component made of engineering plastic.
[0015] The shock-absorbing tool holder of this utility model has a clamping component made of nylon and glass fiber or polyoxymethylene.
[0016] In this invention, the shock-absorbing tool holder device has a gripping groove formed by a recess on the outer circumferential surface of the outer sleeve ring, surrounding the axis L.
[0017] In this invention, the shock-absorbing tool holder device has an outer ring that is embedded in the outer peripheral surface of the gripping section by injection molding.
[0018] The shock-absorbing tool holder of this utility model has an outer connecting portion formed on the outer peripheral surface of the gripping section, and an outer sleeve ring including an inner connecting portion formed on the inner peripheral surface that can engage with the outer connecting portion.
[0019] The beneficial effects of this utility model are as follows: since the clamping member is made of engineering plastic, the damaged part will be concentrated in the clamping member, thereby reducing the portion of the vibration and impact on the cutting tool transmitted to the spindle device, reducing the damage to the spindle device. Furthermore, since the clamping member and the outer ring are made of engineering plastic, replacing expensive and heavy steel processing, the manufacturing and maintenance costs are reduced. Attached Figure Description
[0020] Other features and effects of this utility model will be clearly presented in the embodiments with reference to the accompanying drawings, wherein:
[0021] Figure 1 This is a sectional view illustrating a first embodiment of the shock-absorbing tool holder device of the present invention disposed in a spindle device;
[0022] Figure 2 It is a perspective view illustrating that the first embodiment clamps a cutting tool;
[0023] Figure 3 This is an exploded perspective view of the first embodiment and the cutting tool.
[0024] Figure 4 This is a cross-sectional view of the first embodiment and the cutting tool;
[0025] Figure 5 This is a cross-sectional view illustrating a second embodiment of the shock-absorbing tool holder device of this utility model, which clamps the tool. Detailed Implementation
[0026] See Figure 1 , Figure 2 , Figure 3 A first embodiment of the shock-absorbing tool holder device of this utility model is suitable for being installed on a spindle device 8 and clamping a tool 7. The shock-absorbing tool holder device includes a tool holder 2, a clamping member 3, a clamping member 4, an outer ring 5, and a water-proof unit 6.
[0027] See Figure 1 , Figure 3 , Figure 4 The tool holder 2 extends along an axis L and includes a chuck section 21 and a tool section 23 arranged opposite to each other along the axis L, and a gripping section 22 connecting the chuck section 21 and the tool section 23. The chuck section 21 is adapted for clamping by the spindle assembly 8, the gripping section 22 has an outer connecting portion 221 formed on its outer peripheral surface, and the tool section 23 has a first connecting portion 231 formed on its outer peripheral surface.
[0028] The clamping member 3 is disposed on the tool section 23 and is adapted to clamp the tool 7. In this embodiment, the clamping member 3 is a collet with multiple slots 31 spaced at angular intervals around the axis L and radially extending along the axis L. The inner circumferential surface of the tool section 23 is configured as a tapered surface corresponding to a portion of the outer contour of the clamping member 3. When the clamping member 3 moves toward the chuck section 21, it is pushed and constricted by the inner circumferential surface of the tool section 23, thereby generating a clamping force to clamp the tool 7 toward the axis L.
[0029] The clamping member 4 is movably disposed and positioned on the tool section 23 along the extension direction of the axis L, through which the tool 7 passes and to push the clamping member 3 toward the chuck section 21. The clamping member 4 includes a base wall 41 and a surrounding wall 42 extending from the outer periphery of the base wall 41 along the extension direction of the axis L. The base wall 41 has a through hole 411 extending along the axis L for the tool 7 to pass through, and a waterproof groove 412 surrounding the axis L and communicating with the through hole 411. The surrounding wall 42 has a second connecting portion 421 formed on its inner circumferential surface, which is connected to the first connecting portion 231. The surrounding wall 42 is positioned on the tool section 23. In this embodiment, the first connecting portion 231 and the second connecting portion 421 are configured with interlocking threads. In other embodiments, other interlocking equivalent components may be selected as needed, and are not limited thereto.
[0030] The outer ring 5 is detachably disposed on the gripping section 22 of the tool holder 2. The outer peripheral surface of the outer ring 5 is recessed to form a gripping groove 51 surrounding the axis L, and an inner connecting portion 52 is formed on the inner peripheral surface and can engage the outer connecting portion 221. In this embodiment, the outer connecting portion 221 and the inner connecting portion 52 are configured with mutually locking threads. In other embodiments, other mutually engaging equivalent components may be selected as needed, and are not limited thereto.
[0031] The water-blocking unit 6 is disposed on the clamping member 4 and includes a first barrier 61 disposed in the waterproof groove 412 to prevent fluid from passing between the clamping member 4 and the cutting tool 7, and a second barrier 62 surrounding the axis L and disposed between the clamping member 3 and the enclosure wall 42. The second barrier 62 is used to prevent fluid from passing between the clamping member 3 and the enclosure wall 42. Through the water-blocking unit 6, when it is applied to the cutting tool 7 with a center-outlet water type, it can prevent the cutting fluid with the center-outlet water type from spraying out from the part other than the water outlet of the cutting tool 7. When it is applied to the cutting tool 7 with a non-center-outlet water type, the cutting fluid can remain inside the tool holder 2 and the clamping member 3, and the cutting fluid absorbs the vibration of the cutting tool 7 to reduce the vibration of the tool holder 2.
[0032] It is worth mentioning that the clamping member 3, the tightening member 4, and the outer ring 5 are all made of engineering plastics, for example, at least one of nylon with glass fiber and polyoxymethylene. In this embodiment, the clamping member 3 is made of polyoxymethylene, and the tightening member 4 and the outer ring 5 are made of nylon with glass fiber. In other embodiments, the clamping member 3 may also be made of nylon with glass fiber, or nylon with glass fiber and polyoxymethylene, as required. The tightening member 4 and the outer ring 5 may also be made of polyoxymethylene, or nylon with glass fiber and polyoxymethylene, as required, and are not limited thereto. As those skilled in the art will understand, the above-mentioned engineering plastic materials and their examples are known materials.
[0033] In practical applications, the cutting tool 7 is inserted into the clamping member 4 and the clamping member 3, and adjusted to the appropriate position. The clamping member 4 is then operated; through the mutual engagement of the first connecting part 231 and the second connecting part 421, the clamping member 4 can move relative to the tool holder 2 along the extension direction of the axis L and be positioned on the cutting tool section 23. The base wall 41 abuts against the end of the clamping member 3 away from the tool holder 2. This not only prevents the clamping member 3 from falling off, but also provides a force to push the clamping member 3 towards the chuck section 21 when the clamping member 4 moves towards the chuck section 21, causing the clamping member 3 to tighten and securely clamp the cutting tool 7. Then, the chuck section 21 is matched with the specifications of the spindle device 8 using a corresponding chuck to install the tool holder 2 onto the spindle device 8. The spindle device 8 can then drive the tool holder 2 to move the cutting tool 7 for machining. In addition, by locking the outer ring 5 to the gripping section 22, the gripping groove 51 of the outer ring 5 can be used by the tool magazine device or the robotic arm to grasp it.
[0034] Compared to existing tool holder devices, this invention uses nylon and glass fiber reinforced plastic (NPL) for the clamping member 4. Since NPL and glass fiber reinforced plastic have lower hardness and structural strength than steel, when subjected to vibration and impact, the clamping member 4 will be the first to fail within the tight structure formed by the tool 7, the clamping member 4, and the clamping member 3. After the clamping member 4 fails, the tight structure is disrupted, reducing the amount of force transmitted from the tool 7 to the spindle assembly 8, thus making the spindle assembly 8 less prone to damage. Furthermore, the clamping member 4 is lighter, less expensive to manufacture, and requires less labor than a steel clamping member 4. Therefore, the maintenance cost of replacing the clamping member 4 is lower, thus reducing maintenance costs. In addition, compared to directly machining the outer ring 5, which is integrally formed with the tool holder 2 from steel, this invention uses an outer ring 5 made of nylon and glass fiber. Steel of the same volume is heavier than engineering plastic, and the processing cost is also higher. Therefore, it not only reduces the material cost and processing cost of the tool holder 2 but also reduces the overall weight, making it easier to handle and further achieving the effects of convenient use and reduced maintenance costs.
[0035] See Figure 5 A second embodiment of the shock-absorbing tool holder device of this utility model is the same as the first embodiment, also including the tool holder 2, the clamping member 3, the pressing member 4, the outer ring 5, and the water-proof unit 6. The difference is that the outer ring 5 is embedded in the outer peripheral surface of the gripping section 22 by injection molding. In this way, the gripping section 22 of the tool holder 2 can be formed with less material, and then the outer ring 5 is formed on the gripping section 22. This not only saves the need to process the outer connecting part 221 (e.g., Figure 4 ) and the inner connecting part 52 (e.g. Figure 4 The programming can also save the step of locking the outer ring 5 to the grip section 22.
[0036] Thus, the second embodiment can achieve the same effect as the first embodiment.
[0037] In conclusion, the shock-absorbing tool holder of this utility model can indeed achieve the purpose of this utility model.
Claims
1. A shock-absorbing tool holder device, suitable for mounting on a spindle assembly and clamping a tool, characterized in that: The shock-absorbing tool holder device includes a tool holder component, a clamping component, a pressing component, and an outer ring. The tool holder component extends along an axis and includes a chuck section and a tool section arranged opposite to each other along the axis, and a gripping section connected between the chuck section and the tool section. The chuck section is suitable for clamping by the spindle device. The clamping component is disposed on the tool section and is suitable for clamping the tool. The pressing component is movably disposed along the extension direction of the axis and positioned on the tool section, through which the tool passes and for pushing the clamping component toward the chuck section. The pressing component is made of engineering plastic. The outer ring is disposed on the gripping section for clamping and is also made of engineering plastic.
2. The shock-absorbing tool holder device according to claim 1, characterized in that: The clamping member includes a base wall and a surrounding wall extending from the outer periphery of the base wall along the extension direction of the axis. The base wall has a through hole that passes through the axis and allows the tool to pass through. The surrounding wall is positioned on the tool segment.
3. The shock-absorbing tool holder device according to claim 2, characterized in that: It also includes a water-proof unit disposed on the clamping member, the base wall further having a waterproof groove surrounding the axis and communicating with the through hole, the water-proof unit including a first barrier disposed on the waterproof groove and used to prevent fluid from passing between the clamping member and the cutting tool.
4. The shock-absorbing tool holder device according to claim 3, characterized in that: The water-blocking unit further includes a second barrier member surrounding the axis and disposed between the clamping member and the enclosure wall, the second barrier member being used to prevent fluid from passing between the clamping member and the enclosure wall.
5. The shock-absorbing tool holder device according to claim 1, characterized in that: The clamping element is made of nylon with glass fiber or polyoxymethylene, and the outer ring is made of nylon with glass fiber or polyoxymethylene.
6. The shock-absorbing tool holder device according to claim 1, characterized in that: The clamping element is made of engineering plastic.
7. The shock-absorbing tool holder device according to claim 6, characterized in that: The clamping element is made of nylon with glass fiber or polyoxymethylene.
8. The shock-absorbing tool holder device according to claim 1, characterized in that: The outer peripheral surface of the outer ring is recessed to form a gripping groove around the axis L.
9. The shock-absorbing tool holder device according to claim 1, characterized in that: The outer ring is embedded in the outer peripheral surface of the gripping section by injection molding.
10. The shock-absorbing tool holder device according to claim 1, characterized in that: The gripping segment has an outer connecting portion formed on the outer peripheral surface, and the outer sleeve includes an inner connecting portion formed on the inner peripheral surface that can engage the outer connecting portion.