A steady chuck for machining center spindle
By designing a stable chuck for machining center spindles, a combination structure of bushing, expansion element and locking tube is adopted to achieve uniform clamping force distribution and self-locking anti-loosening, solving the problems of uneven clamping and safety hazards of traditional chucks, and improving machining accuracy and spindle life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN RUIJING IND & TRADE CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-08-04
AI Technical Summary
Uneven clamping force distribution in traditional spindle chucks causes spindle yaw and vibration, affecting machining accuracy. Over time, clamping performance deteriorates, and the lack of a self-locking anti-loosening mechanism poses a safety hazard.
Design a stable chuck including a bushing, an expansion member, a first locking tube, and a second locking tube. A uniform clamping force distribution is achieved through a tapered expansion structure and threaded connection, and a self-locking and anti-loosening mechanism is formed through a snap-fit structure.
It improves machining accuracy and surface quality, ensures long-term stability of clamping performance, extends spindle life, and enhances the safety and stability of machining production.
Smart Images
Figure CN224587002U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spindle clamping technology, specifically a stabilizing chuck for machining center spindles. Background Technology
[0002] In high-precision machining in machining centers, the spindle is a core component, and its stability and clamping accuracy play a decisive role in part quality and production efficiency. Traditional spindle chucks, as key components for fixing and driving spindle rotation, are difficult to meet modern machining requirements due to defects in their structural design or working principle.
[0003] When some traditional chucks hold a spindle, the clamping force is unevenly distributed, making the spindle prone to slight runout or vibration during rotation. These vibrations are transmitted to the tool and workpiece, resulting in ripples and dimensional deviations on the machined surface, which seriously affects machining accuracy and surface quality. This problem is particularly prominent in the machining of high-precision parts such as aerospace engine blades and precision molds.
[0004] Meanwhile, after prolonged use, traditional chucks experience a decline in clamping performance due to wear and fatigue, resulting in insufficient or unstable clamping force, which affects machining quality and spindle life. Furthermore, some chucks lack effective self-locking and anti-loosening mechanisms, making them prone to loosening during machining due to vibration or external forces, posing safety hazards.
[0005] In view of the above problems, a stabilizing chuck for machining center spindles is proposed. Utility Model Content
[0006] (a) Technical problems to be solved
[0007] To address the shortcomings of existing technologies, this utility model provides a stable chuck for machining center spindles, which has the advantages of stable clamping and the ability to maintain good clamping performance over a long period of time. It solves the problems of uneven clamping force distribution in traditional spindle chucks, which leads to spindle yaw and vibration affecting machining accuracy, decreased clamping performance after long-term use, and safety hazards due to the lack of an effective self-locking anti-loosening mechanism.
[0008] (II) Technical Solution
[0009] To achieve the aforementioned goal of stable clamping and maintaining good clamping performance over a long period, this utility model provides the following technical solution:
[0010] A stabilizing chuck for a machining center spindle includes a bushing, an expansion member, a first locking tube, and a second locking tube.
[0011] The end of the bushing is fixed to the drive device, and the upper end is threadedly connected to the expansion member;
[0012] The expansion member has a main shaft inserted into its middle part, and the end of the main shaft is located at the bottom of the bushing.
[0013] The lower end of the first locking tube is threadedly connected to the expansion member;
[0014] The second locking tube is slidably sleeved on the outer surface of the bushing, and its upper end can be connected to the first locking tube;
[0015] The main shaft, expansion member, bushing, first locking tube, and second locking tube are all on the same axis.
[0016] The preferred technical solution of this utility model is that the expansion member is provided with an upper expansion head at the upper end, a lower expansion head at the lower end, and a first external thread in the middle.
[0017] The preferred technical solution of this utility model is that the inner surfaces of the upper expansion head and the lower expansion head jointly press and clamp the main shaft at two points.
[0018] The preferred technical solution of this utility model is that both the upper expansion head and the lower expansion head are conical expansion structures, and the side of each conical expansion structure closest to the first external thread is the bottom surface of the conical expansion structure.
[0019] A preferred embodiment of this invention is that the upper end of the bushing is provided with a first internal thread, which engages with the lower half of the first external thread.
[0020] The preferred technical solution of this utility model is that the first locking tube has a second external thread and a second internal thread located at the bottom, and the second internal thread is engaged with the upper half of the first external thread.
[0021] A preferred embodiment of this invention is that the second locking tube has a third internal thread, which engages with the second external thread.
[0022] The preferred technical solution of this utility model is that an inverted conical slope is provided on the inner wall of the bushing at the lower expansion head to cooperate with it, and a positive conical slope is provided on the inner wall of the first locking tube at the upper expansion head to cooperate with it.
[0023] The preferred technical solution of this utility model is that a retaining ring is provided at the upper end of the outer side of the bushing, and a protrusion is provided at the bottom of the inner wall of the second locking tube, and the protrusion is engaged with the lower end of the retaining ring.
[0024] (III) Beneficial Effects
[0025] Compared with the prior art, this utility model provides a stabilizing chuck for machining center spindles, which has the following beneficial effects:
[0026] This stabilizing chuck for machining center spindles features a tapered expansion structure with an upper expansion head at the top and a lower expansion head at the bottom. These expansion heads engage with the inverted tapered slope of the bushing and the positive tapered slope of the first locking tube, respectively. This design allows the inner surfaces of the upper and lower expansion heads to jointly press and clamp the spindle at two points, achieving a uniform distribution of clamping force. This effectively prevents spindle wobbling and vibration during rotation, significantly improving machining accuracy and surface quality. It is particularly suitable for machining high-precision parts.
[0027] This stabilizing chuck for machining center spindles features a threaded connection and sliding sleeve design between the bushing, expansion member, first locking tube, and second locking tube. Combined with the locking structure between the second locking tube protrusion and the bushing retainer, it forms a reliable self-locking and anti-loosening mechanism. This ensures stable clamping performance during long-term use, avoids insufficient clamping force or loosening, significantly extends the spindle's service life, and improves the safety and stability of machining production. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the overall structure assembly of this utility model;
[0029] Figure 2 This is an exploded view of the overall structure of this utility model;
[0030] Figure 3 This is a cross-sectional view of the overall structure of this utility model;
[0031] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;
[0032] Figure 5 This is a schematic diagram of the structure of the central bushing and the second locking tube of this utility model;
[0033] Figure 6 This is a schematic diagram of the expansion component structure in this utility model;
[0034] Figure 7 This is a schematic diagram of the first locking tube structure in this utility model.
[0035] In the diagram: 1. Bushing; 11. Inverted tapered surface; 12. First internal thread; 13. Snap ring; 2. Expansion member; 21. Upper expansion head; 22. Lower expansion head; 23. First external thread; 3. First locking tube; 31. Second external thread; 32. Second internal thread; 33. Positive tapered surface; 4. Second locking tube; 41. Protrusion; 42. Third internal thread; 5. Spindle. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0037] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0039] Please see Figure 1-7 A stabilizing chuck for a machining center spindle includes a bushing 1, an expansion member 2, a first locking tube 3, and a second locking tube 4.
[0040] The end of bushing 1 is fixed to the drive device, and the upper end is threaded to the expansion member 2;
[0041] The expansion member 2 has a main shaft 5 inserted into its middle part, and the end of the main shaft 5 is located at the bottom of the bushing 1.
[0042] The lower end of the first locking tube 3 is threadedly connected to the expansion member 2;
[0043] The second locking tube 4 is slidably sleeved on the outer surface of the bushing 1, and its upper end can be connected to the first locking tube 3;
[0044] The main shaft 5, the expansion member 2, the bushing 1, the first locking tube 3, and the second locking tube 4 are all on the same axis.
[0045] In this embodiment, the expansion member 2 has an upper expansion head 21 at its upper end and a lower expansion head 22 at its lower end, with a first external thread 23 in the middle. The inner surfaces of the upper expansion head 21 and the lower expansion head 22 together press and clamp the main shaft 5 at two points.
[0046] It should be noted that the expansion member 2 has an upper expansion head 21 at the upper end and a lower expansion head 22 at the lower end. This double expansion head structure can clamp the spindle 5 from two different positions. Compared with single-point clamping, it can more comprehensively wrap the spindle 5, providing a structural basis for achieving uniform clamping force distribution in the future. It is a key starting design to ensure stable clamping of the spindle 5.
[0047] In this embodiment, both the upper expansion head 21 and the lower expansion head 22 are conical expansion structures, and the side of both near the first external thread 23 is the bottom surface of the conical expansion structure.
[0048] It should be noted that this design allows the tapered structure to expand in a specific direction when subjected to axial force during subsequent engagement with the bushing 1 and the first locking tube 3, converting the axial force into a radial clamping force on the spindle 5. At the same time, the design of the bottom surface being close to the first external thread 23 facilitates precise threaded connection and engagement with the bushing 1 and the first locking tube 3.
[0049] In this embodiment, the upper end of the bushing 1 is provided with a first internal thread 12, which engages with the lower half of the first external thread 23.
[0050] It should be noted that the first internal thread 12 at the upper end of the bushing 1 is engaged with the lower half of the first external thread 23 of the expansion member 2. This partial thread engagement method can ensure sufficient connection strength between the bushing 1 and the expansion member 2, and also leave space for the subsequent threaded connection between the first locking tube 3 and the expansion member 2, making the assembly and disassembly of the entire clamp more convenient, and also facilitating the precise axial positioning of the expansion member 2.
[0051] In this embodiment, the first locking tube 3 has a second external thread 31 and a second internal thread 32 located at the bottom, and the second internal thread 32 is engaged with the upper part of the first external thread 23.
[0052] It should be noted that the second internal thread 32 mates with the upper half of the first external thread 23 of the expansion member 2, which further enhances the connection stability between the expansion member 2 and the first locking tube 3, ensuring that the expansion member 2 will not loosen during processing; while the second external thread 31 provides the conditions for connection with the second locking tube 4, making the entire chuck form an organic whole.
[0053] In this embodiment, the second locking tube 4 has a third internal thread 42, which engages with the second external thread 31.
[0054] It should be noted that this mating method allows the second locking tube 4 to slide axially along the bushing 1 and connect with the first locking tube 3. By adjusting the position of the second locking tube 4, the clamping state of the entire chuck can be fine-tuned, while also enhancing the overall structural stability of the chuck and preventing loosening during processing.
[0055] In this embodiment, an inverted conical slope 11 that cooperates with the inner wall of the bushing 1 at the lower expansion head 22 is provided, and a positive conical slope 33 that cooperates with the inner wall of the first locking tube 3 at the upper expansion head 21 is provided.
[0056] It should be noted that when the expansion member 2 is subjected to axial force, the inverted conical inclined surface 11 and the positive conical inclined surface 33 can guide the upper expansion head 21 and the lower expansion head 22 to expand evenly, so that the clamping force is more evenly distributed on the surface of the spindle 5, reducing the situation of excessive or insufficient local force on the spindle 5, thereby improving the stability and accuracy of clamping.
[0057] In this embodiment, a retaining ring 13 is provided on the upper end of the outer side of the bushing 1, and a protrusion 41 is provided on the bottom surface of the inner wall of the second locking tube 4. The protrusion 41 is engaged with the lower end of the retaining ring 13.
[0058] It should be noted that the retaining ring 13 on the upper side of the outer side of the bushing 1 engages with the protrusion 41 on the bottom side of the inner wall of the second locking tube 4. This engagement structure can axially limit the second locking tube 4 after it is connected to the first locking tube 3, preventing the second locking tube 4 from moving axially due to vibration or external force during processing. This ensures the self-locking and anti-loosening performance of the entire chuck and ensures the long-term stability of the spindle 5 clamping.
[0059] In summary, this stabilizing chuck for machining center spindles utilizes the conical expansion structure design of the upper expansion head 21 and the lower expansion head 22 at the upper end of the expansion member 2. These structures cooperate with the inverted conical inclined surface 11 of the bushing 1 and the positive conical inclined surface 33 of the first locking tube 3, respectively. This allows the inner surfaces of the upper expansion head 21 and the lower expansion head 22 to jointly press and clamp the spindle 5 at two points, achieving a uniform distribution of clamping force. This effectively prevents the spindle 5 from wobbling and vibrating during rotation, significantly improving machining accuracy and surface quality. It is especially suitable for machining high-precision parts.
[0060] This stabilizing chuck for machining center spindles, through the threaded connection and sliding sleeve design between the bushing 1, expansion member 2, first locking tube 3 and second locking tube 4, and the snap-fit structure between the protrusion 41 of the second locking tube 4 and the retaining ring 13 of the bushing 1, forms a reliable self-locking and anti-loosening mechanism. This ensures stable clamping performance during long-term use, avoids problems such as insufficient clamping force or loosening, significantly extends the service life of the spindle 5, and improves the safety and stability of machining production.
[0061] Clamping process: When clamping the spindle 5, insert the spindle 5 into the middle of the expansion member 2, first rotate the expansion member 2 so that the end of the spindle 5 is at the bottom of the bushing 1. Then, by rotating the first locking tube 3, since the second internal thread 32 of the first locking tube 3 is engaged with the upper half of the first external thread 23 of the expansion member 2, the first locking tube 3 will move downward along the axial direction. During the movement, the positive conical slope 33 of the inner wall of the first locking tube 3 will apply pressure to the upper expansion head 21 of the expansion member 2, and at the same time, the engagement between the internal thread at the upper end of the bushing 1 and the lower half of the first external thread 23 of the expansion member 2, as well as the supporting effect of the inverted conical slope 11 of the inner wall of the bushing 1 on the lower expansion head 22, will cause the upper expansion head 21 and the lower expansion head 22 to contract inward along the conical structure under the action of axial force. The inner surfaces of the upper expansion head 21 and the lower expansion head 22 together press and clamp the main shaft 5 at two points. Due to the design of the tapered inclined surface and the expansion head, the clamping force can be evenly distributed on the surface of the main shaft 5, thereby effectively preventing the main shaft 5 from swaying or vibrating when rotating.
[0062] Self-locking and anti-loosening process: After the first locking tube 3 is rotated into place, the second locking tube 4 is slid upward along the bushing 1, so that the third internal thread 42 of the second locking tube 4 engages with the second external thread 31 of the first locking tube 3, thus connecting the second locking tube 4 and the first locking tube 3. At this time, the protrusion 41 on the bottom surface of the inner wall of the second locking tube 4 will engage with the lower end of the retaining ring 13 on the upper surface of the outer side of the bushing 1, forming a reliable engagement structure. This engagement structure can prevent the second locking tube 4 from axially moving due to vibration or external force during processing. At the same time, the threaded connection between the first locking tube 3, the expansion member 2, and the bushing 1 further enhances the structural stability of the entire chuck, ensuring stable clamping performance during long-term use and avoiding problems such as insufficient clamping force or loosening, thereby significantly extending the service life of the spindle 5 and improving the safety and stability of processing production.
[0063] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A stabilizing chuck for a machining center spindle, comprising a bushing, an expansion member, a first locking tube, and a second locking tube, characterized in that: The end of the bushing is fixed to the drive device, and the upper end is threadedly connected to the expansion member; The expansion member has a main shaft inserted in the middle, and the end of the main shaft is located at the bottom of the bushing; The lower end of the first locking tube is threadedly connected to the expansion member; The second locking tube is slidably sleeved on the outer surface of the bushing, and its upper end can be connected to the first locking tube; The main shaft, expansion member, bushing, first locking tube, and second locking tube are all on the same axis.
2. A stabilizing chuck for a machining center spindle according to claim 1, characterized in that: The expansion member has an upper expansion head at the upper end, a lower expansion head at the lower end, and a first external thread in the middle.
3. A stabilizing chuck for a machining center spindle according to claim 2, characterized in that: The inner surfaces of the upper and lower expansion heads together apply pressure and clamping to two points on the main shaft.
4. A stabilizing chuck for a machining center spindle according to claim 2, characterized in that: Both the upper and lower expansion heads are conical expansion structures, and the side closest to the first external thread is the bottom surface of the conical expansion structure.
5. A stabilizing chuck for a machining center spindle according to claim 1, characterized in that: The upper end of the bushing is provided with a first internal thread, which engages with the lower half of the first external thread.
6. A stabilizing chuck for a machining center spindle according to claim 1, characterized in that: The first locking tube has a second external thread and a second internal thread located at the bottom, and the second internal thread mates with the upper part of the first external thread.
7. A stabilizing chuck for a machining center spindle according to claim 6, characterized in that: The second locking tube has a third internal thread, which mates with the second external thread.
8. A stabilizing chuck for a machining center spindle according to claim 1, characterized in that: The inner wall of the bushing at the lower expansion head is provided with an inverted conical slope that matches it, and the inner wall of the first locking tube at the upper expansion head is provided with a positive conical slope that matches it.
9. A stabilizing chuck for a machining center spindle according to claim 1, characterized in that: A retaining ring is provided on the upper end of the outer side of the bushing, and a protrusion is provided on the bottom surface of the inner wall of the second locking tube. The protrusion is engaged with the lower end of the retaining ring.