Precise inner support spring chuck device for spindle of numerically controlled lathe

Abstract

The utility model discloses a numerical control lathe spindle precise inner support spring chuck device which comprises a connecting sleeve, the connecting sleeve is installed in a numerical control spindle taper hole, an elastic clamping sleeve is installed at the position, close to one end of the connecting sleeve, of the connecting sleeve, and a workpiece is arranged on the elastic clamping sleeve in a sleeved mode. A pressing rod is installed in the connecting sleeve, one end of the pressing rod is located in the elastic clamping sleeve, and the other end of the pressing rod is connected with the adjusting part. A taper sleeve is installed on the connecting sleeve and located in the elastic clamping sleeve, the end face of one end of the taper sleeve is attached to the end face of the connecting sleeve, and the end face of the other end of the taper sleeve is attached to the pressing rod. The adjusting part is installed on the end, away from the elastic clamping sleeve, of the connecting sleeve and connected with a numerical control lathe hydraulic pull rod. According to the device, the taper sleeve is extruded through the pressing rod in the connecting sleeve, the taper sleeve is expanded, then the outer wall of the elastic clamping sleeve is expanded synchronously in a multi-point mode, a workpiece arranged on the elastic clamping sleeve in a sleeving mode is fixed and positioned, the positioning progress is high, the workpiece is not prone to deformation, and the positioning progress of workpiece clamping is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining auxiliary tools, in particular to a precision inner-support spring chuck device for a main shaft of a numerically controlled lathe. Background Art

[0002] CNC lathes are usually used to process fixed shell-type and thin-walled rotating parts. When using CNC lathes for processing, three-jaw chucks are usually used to clamp the parts. The three jaws on the three-jaw chuck are adjusted to extend into the inner hole of the workpiece, and the three self-centering jaws are radially adjusted to move synchronously so that the three jaws are clamped on the inner wall of the inner hole of the workpiece to fix the workpiece on the three-jaw chuck. The three-jaw chuck is fixed by three-point force during the fixing process. In order to ensure the stability of the workpiece clamping and avoid the workpiece from shaking during the processing and the positioning deviation caused by the shaking, the three-jaw chuck needs to apply a certain clamping force. However, due to the relatively weak strength of thin-walled parts and the small three-point force area, the three-jaw chuck is easy to cause the workpiece to deform and the positioning of the workpiece to shift during the clamping process, making it difficult to ensure the processing accuracy of the workpiece, resulting in the waste of the workpiece and high production costs. Utility Model Content

[0003] In order to solve the problem in the prior art that during the process of machining thin-walled rotating workpieces by CNC lathes, when a three-jaw chuck is used to hold the workpiece, the workpiece is easily deformed, resulting in poor positioning and low machining accuracy, the utility model provides a precision internal support spring chuck device for CNC lathes.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A precision inner-support spring chuck device for a CNC lathe spindle, comprising a connecting sleeve, the connecting sleeve is installed in a tapered hole of the CNC spindle, an elastic sleeve is installed near one end of the connecting sleeve, and a workpiece is sleeved on the elastic sleeve;

[0006] A pressure rod is installed in the connecting sleeve, one end of the pressure rod is located in the elastic jacket, and the other end of the pressure rod is connected to the adjustment part;

[0007] A cone sleeve is installed on the connecting sleeve in the elastic sleeve, and one end surface of the cone sleeve is in contact with the end surface of the connecting sleeve, and the other end surface of the cone sleeve is in contact with the pressure rod;

[0008] The adjusting part is installed on the end of the connecting sleeve away from the elastic sleeve, and the adjusting part is connected with a hydraulic pull rod of a numerically controlled lathe.

[0009] Preferably, the adjusting part comprises a moving rod, the moving rod is installed in the connecting sleeve, one end of the moving rod is connected to the pressure rod, and the other end of the moving rod is connected to the hydraulic pull rod of the CNC lathe;

[0010] The moving rod is provided with a countersunk hole, an adjusting screw is movably installed in the countersunk hole, and one end of the adjusting screw is connected to the connecting sleeve;

[0011] A spring is sleeved on the adjusting screw, the spring is located in the countersunk hole, and the adjusting screw axially compresses the spring.

[0012] Preferably, the axial compression length of the spring is 3 to 5 mm.

[0013] Preferably, a mounting sleeve is connected between the moving rod and the hydraulic pull rod of the CNC lathe, one end of the mounting sleeve is connected to the moving rod through a thread, and the other end of the mounting sleeve is connected to the hydraulic pull rod of the CNC lathe with a fixing screw.

[0014] Preferably, the elastic jacket is provided with a fixing hole, the connecting sleeve is provided with a connecting hole at a position corresponding to the fixing hole, and fixing rods are installed in the connecting hole and the corresponding fixing hole.

[0015] Preferably, the elastic jacket is externally connected to a pressure detector, and the pressure detector is used to detect the clamping force of the elastic jacket on the workpiece.

[0016] Preferably, there is a displacement gap between the end surface of the pressure rod relative to the workpiece and the inner end surface of the tapered sleeve.

[0017] Preferably, the width of the displacement gap is 0.5-1 mm.

[0018] Preferably, the cone sleeve is made of spring tool steel.

[0019] Preferably, the elastic jacket is made of one of brass and beryllium copper.

[0020] Compared with the prior art, the utility model has the following beneficial technical effects:

[0021] The utility model discloses a precision inner-support spring chuck device for a CNC lathe, which is installed in the tapered hole of a spindle of the CNC lathe through a connecting sleeve, and the inner tapered surface of the tapered hole of the spindle of the CNC lathe fits with the outer tapered surface of the connecting sleeve, so that the tapered surface in the tapered hole of the CNC spindle and the tapered surface on the outer wall of the connecting sleeve are subjected to positive pressure and axial force, thereby avoiding the occurrence of mechanical self-locking phenomenon, ensuring that when clamping and loosening during the control process of a servo motor of the equipment, the tapered surface in the tapered hole of the CNC spindle and the tapered surface on the outer wall of the connecting sleeve can be automatically locked and self-disengaged, thereby improving the stability of the operation of the device; an elastic clamping sleeve is arranged on the right end surface of the connecting sleeve, and the elastic clamping sleeve is provided on the right end surface of the connecting sleeve. The sleeve is provided with a first opening groove. When an external force acts on the inner wall of the elastic sleeve, the outer wall of the elastic sleeve will be expanded, and then the outer wall will fix and position the workpiece sleeved thereon at multiple points. Since the outer wall of the elastic sleeve is expanded synchronously, the positioning progress is high, and the multi-point expansion is not easy to cause deformation of the workpiece, thereby improving the positioning progress of the workpiece clamping, and then improving the processing progress of the workpiece; and a tapered sleeve is arranged in the elastic sleeve, and the tapered sleeve is expanded by moving the pressure rod arranged in the connecting sleeve, thereby expanding the elastic sleeve. The operation is convenient and the support is stable, thereby improving the processing efficiency and processing accuracy of thin-walled rotating workpieces.

[0022] Furthermore, the device is provided with an adjustment part at the left end of the connecting sleeve, and the adjusting screw is rotated in the adjustment part to adjust the screwing depth of the adjusting screw on the connecting sleeve, thereby changing the axial compression length of the spring, and then setting the axial movement distance, thereby limiting the diameter of the outer wall of the elastic sleeve. At the same time, after the workpiece is processed, the hydraulic pull rod of the CNC lathe unloads the force, and the moving rod is moved to the right along the connecting sleeve through the spring, so that the tapered sleeve and the elastic sleeve restore the elastic deformation.

[0023] Furthermore, the device is equipped with a mounting sleeve between the adjustment part and the hydraulic pull rod of the CNC lathe, and the mounting sleeve connects the hydraulic pull rod of the CNC lathe with the movable rod. The setting of the mounting sleeve facilitates the disassembly between the movable rod and the hydraulic pull rod of the CNC lathe, thereby facilitating the adjustment of the axial compression length of the spring.

[0024] Furthermore, in the device, the elastic sleeve and the connecting sleeve are connected by a fixing rod. When the outer wall diameter of the elastic sleeve does not meet the diameter of the inner hole of the workpiece, the fixing rod can facilitate the disassembly between the elastic sleeve and the connecting sleeve, and facilitate the replacement of a new elastic sleeve to improve the practicality of the device.

[0025] Furthermore, in the device, a pressure detector is externally connected to the elastic sleeve, and the pressure detector can detect the clamping force applied by the elastic sleeve to the workpiece, so that the staff can clearly understand the clamping force applied by the elastic sleeve to the workpiece, and adjust the axial compression length of the spring in the device according to the clamping force to avoid excessive adjustment of the axial compression length of the spring, which will cause the clamping force generated by the elastic sleeve to be too large and deform the workpiece.

[0026] Furthermore, in the present device, there is a displacement gap between the end face of the pressure rod relative to the workpiece and the inner end face of the cone sleeve, and the width of the displacement gap is 0.5 to 1 mm. The displacement gap facilitates adjusting the degree of expansion and contraction of the cone sleeve and the elastic sleeve and adjusting the diameter of the outer wall of the elastic sleeve by adjusting the compression length of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the front cross-sectional structure of a precision inner-support spring chuck device for a CNC lathe provided by the utility model;

[0028] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 A schematic diagram of the structure of a taper sleeve in a precision inner-support spring chuck device for a CNC lathe provided by the utility model;

[0030] Figure 4 A schematic diagram of the structure of an elastic clamping sleeve in a precision inner-support spring chuck device for a CNC lathe provided by the utility model;

[0031] In the attached figure: 1. moving rod; 2. spring; 3. connecting sleeve; 4. pressure rod; 5. taper sleeve; 6. elastic clamping sleeve; 7. mounting sleeve; 8. workpiece; 9. adjusting screw. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0038] See also Figure 1-Figure 4The utility model discloses a precision inner support spring chuck device for a CNC lathe spindle, the device comprises a connecting sleeve 3, the outer wall of the connecting sleeve 3 is provided with an outer taper, the outer taper surface is processed by precision grinding, and the surface roughness is within the range of Ra0.4-0.8μm, the connecting sleeve 3 is installed in the CNC spindle tapered hole, so that the outer wall of the connecting sleeve 3 and the tapered surface in the CNC spindle tapered hole fit more than 80%, reducing the static friction coefficient between the two; at the same time, the inclined cone angle a on the outer wall of the connecting sleeve 3 is greater than the friction angle u, during the use of the device, the tapered surface in the CNC spindle tapered hole and the tapered surface on the outer wall of the connecting sleeve 3 are subjected to positive pressure and axial force, avoiding the occurrence of mechanical self-locking phenomenon, ensuring that when clamping and loosening during the control process of the servo motor of the equipment, the tapered surface in the CNC spindle tapered hole and the tapered surface on the outer wall of the connecting sleeve 3 can be automatically locked and self-disengaged, thereby improving the stability of the device operation. An annular step is provided on the outer wall of the connecting sleeve 3 near the right end, and the axial direction of the annular step is the same as the axial direction of the connecting sleeve 3, and the axes of the two are collinear. An elastic sleeve 6 is installed on the annular step, and the axial direction of the elastic sleeve 6 is the same as that of the connecting sleeve 3, and the left end of the elastic sleeve 6 is fixed on the connecting sleeve 3, and the workpiece 8 is sleeved on the right end of the elastic sleeve 6. A plurality of first opening grooves are provided on the outer wall of the elastic sleeve 6 along its axial direction. The plurality of first opening grooves can enable the elastic sleeve 6 to stably undergo elastic deformation, and through multi-point support, multi-point synchronous expansion is performed in the inner hole of the workpiece 8 to fix the workpiece 8, thereby avoiding deformation of the workpiece 8 due to the expansion points when the workpiece 8 is fixed.

[0039] See also Figure 1The left end of the cone sleeve 5 is connected to the right end of the cone sleeve 3, and the right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3. The right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3, and the right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3. The right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3. The right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3. The right end of the cone sleeve 5 is connected to the right end of the cone sleeve 3. There is a moving distance between the right end of the cone sleeve 5 and the right end of the cone sleeve 3. The outer wall of the cone sleeve 5 is provided with a plurality of second opening grooves along its axial direction. The plurality of second opening grooves are equidistantly arranged circumferentially on the outer wall of the cone sleeve 5, thereby dividing the outer wall of the cone sleeve 5 into a plurality of connected area blocks. When the equipment servo control clamps When the workpiece 8 is fixed, the pressure rod 4 moves to the left along the axial direction of the connecting sleeve 3, and the right end head of the pressure rod 4 squeezes the right end face of the tapered sleeve 5, so that the outer circle size of the tapered sleeve 5 expands and increases, and is transmitted to the elastic sleeve 6 to increase its outer circle at the same time, so that the right end head of the elastic sleeve 6 is expanded in the inner hole of the workpiece 8, and the workpiece 8 is fixed and positioned; when the servo control of the equipment is released, the leftward pulling force on the pressure rod 4 is released and is in a free state, the tapered sleeve 5 will restore its deformation, and then push the pressure rod 4 to move to the right along the axial direction of the connecting sleeve 3, and then the tapered sleeve 5 and the elastic sleeve 6 shrink and become smaller to their original initial state; the adjusting part is installed at the position of the left end head of the connecting sleeve 3, and the left end of the adjusting part is connected to the CNC lathe hydraulic pull rod, and the adjusting part is pulled by the CNC lathe hydraulic pull rod, and the adjusting part drives the pressure rod 4 to move, compresses the tapered sleeve 5, so that the elastic sleeve 6 is expanded, and the workpiece 8 is fixed and positioned.

[0040] See also Figure 1 and Figure 2The adjusting part includes a moving rod 1, which is installed in the connecting sleeve 3 at its left end, and the left end of the moving rod 1 is located outside the connecting sleeve 3. The right end of the moving rod 1 is connected to the left end of the pressing rod 4 by a threaded connection. The left end of the moving rod 1 is connected to the hydraulic pull rod of the CNC lathe. The moving rod 1 is moved by the hydraulic pull rod of the CNC lathe, thereby driving the pressing rod 4 to compress the cone sleeve 5 to expand it. A plurality of countersunk holes are arranged on the left end face of the moving rod 1, and the plurality of countersunk holes are arranged circumferentially at equal intervals on the left end face of the moving rod 1. A second threaded hole is arranged on the left end face of the connecting sleeve 3 at a position corresponding to the countersunk hole. A plurality of second threaded holes are also arranged, and each second threaded hole corresponds to a countersunk hole, and the two correspond one to one. An adjusting screw 9 is passed through each countersunk hole, and the adjusting screw 9 is clearance-matched with the countersunk hole so that the adjusting screw 9 can move along the axial direction of the countersunk hole. The right end head of the adjusting screw 9 extends out of the countersunk hole and is screwed into the second threaded hole corresponding to the countersunk hole, so as to limit the moving rod 1 so that the moving rod 1 can only move along its axial direction in the connecting sleeve. A sleeve is provided on the adjusting screw 9. Spring 2, spring 2 is located in the countersunk hole, and the right end of the spring 2 is in contact with the inner end face of the countersunk hole, and the left end face of the spring 2 is in contact with the end face of the inner end face of the countersunk hole on the adjusting screw 9. The depth of the adjusting screw 9 screwed in the second threaded hole is adjusted to axially compress the length of the spring 2, thereby setting the distance of axial movement, thereby limiting the diameter of the outer wall of the elastic jacket 6. At the same time, after the workpiece 8 is processed, the hydraulic pull rod of the CNC lathe unloads the force, and the moving rod 1 is moved to the right along the connecting sleeve 3 through the spring 2, so that the tapered sleeve 5 and the elastic jacket 6 restore elastic deformation, thereby quickly restoring the device to the initial device; in this embodiment, the axial compression length of the spring 2 is 3 to 5 mm.

[0041] See also Figure 1 , a mounting sleeve 7 is connected between the moving rod 1 and the hydraulic rod of the CNC lathe. An internal thread is arranged in the mounting sleeve 7 at the position of the right end. An internal thread is arranged on the outer wall of the moving rod 1 at the position of the left end. The external thread cooperates with the internal thread to connect the left end of the moving rod 1 with the right end of the mounting sleeve 7. The thread rotation direction of the external thread and the internal thread is opposite to the direction of rotation of the CNC lathe spindle. After the two are connected, the external thread and the internal thread will not loosen during the rotation of the CNC lathe spindle to drive the connecting sleeve 3. Instead, the two will be screwed more tightly, which will play a loosening role. A first threaded hole is arranged on the left end of the mounting sleeve 7. A fixing screw is arranged in the first threaded hole. The left end of the fixing screw is connected to the CNC lathe hydraulic rod, and the mounting sleeve 7 is connected to the CNC lathe hydraulic rod. The CNC lathe hydraulic rod is connected to the moving rod 1 through the mounting sleeve 7. The setting of the mounting sleeve 7 facilitates the disassembly between the moving rod 1 and the CNC lathe hydraulic rod, and then facilitates the adjustment of the axial compression length of the spring 2.

[0042] See also Figure 1 and Figure 3 A plurality of fixing holes are arranged on the left end face of the elastic sleeve 6, and the plurality of fixing holes are arranged circumferentially at equal intervals. A connecting hole is arranged at a position corresponding to the fixing hole on the annular step platform arranged on the outer wall of the connecting sleeve 3, and the connecting holes correspond to the fixing holes one by one. A fixing rod is installed in the corresponding fixing holes and the connecting holes. The fixing rod is threadedly connected to the fixing hole and the connecting hole respectively, so that the elastic sleeve 6 is stably fixed on the annular step platform arranged on the connecting sleeve 3. At the same time, when the outer wall diameter size of the elastic sleeve 6 does not meet the diameter size of the inner hole of the workpiece 8, the elastic sleeve 6 can be removed from the connecting sleeve 3 by removing the fixing rod, and then replaced with a new elastic sleeve 6, thereby improving the practicality of the device.

[0043] Preferably, a pressure detector is externally connected to the elastic jacket 6, and the pressure detector is used to detect the clamping force applied by the elastic jacket 6 to the workpiece 8, so that the staff can clearly understand the clamping force applied by the elastic jacket 6 to the workpiece 8, and adjust the axial compression length of the spring 2 in the device according to the clamping force to avoid excessive adjustment of the axial compression length of the spring 2, which will cause the clamping force generated by the elastic jacket 6 to be too large and deform the workpiece 8 internally.

[0044] See also Figure 1 There is a displacement gap between the end face of the pressure rod 4 relative to the workpiece 8 and the inner end face of the cone sleeve 5. The width of the displacement gap is 0.5-1 mm, and the displacement gap is convenient for adjusting the compression length of the spring 2, thereby adjusting the expansion and contraction degree of the cone sleeve 5 and the elastic jacket 6, and adjusting the diameter of the outer wall of the elastic jacket 6.

[0045] Furthermore, the cone sleeve 5 is made of high-quality spring tool steel. Since the high-quality spring tool steel has sufficient elasticity and hardness, the cone sleeve 5 can be rigidly expanded under the action of external force. After the external force is removed, the cone sleeve 5 returns to its original shape due to the performance of its material, so that the cone sleeve 5 can be reused.

[0046] Furthermore, the elastic jacket 6 is made of a material selected from brass and beryllium bronze, so as to ensure the consistency and stability of the elastic jacket 6 in expanding and contracting along with the outer circle of the conical sleeve 5 .

[0047] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0048] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A precision inner support spring chuck device for a CNC lathe spindle, characterized in that: It comprises a connecting sleeve (3), the connecting sleeve (3) is installed in the tapered hole of the CNC spindle, an elastic clamping sleeve (6) is installed on the connecting sleeve (3) near one end thereof, and a workpiece (8) is sleeved on the elastic clamping sleeve (6); A pressure rod (4) is installed in the connecting sleeve (3), one end of the pressure rod (4) is located in the elastic jacket (6), and the other end of the pressure rod (4) is connected to an adjustment portion; A cone sleeve (5) is installed on the connecting sleeve (3) inside the elastic sleeve (6), and one end surface of the cone sleeve (5) is in contact with the end surface of the connecting sleeve (3), and the other end surface of the cone sleeve (5) is in contact with the pressure rod (4); The adjusting portion is mounted on the end of the connecting sleeve (3) away from the elastic clamping sleeve (6), and the adjusting portion is connected to a hydraulic pull rod of a CNC lathe.

2. The CNC lathe spindle precision inner support spring chuck device according to claim 1, characterized in that: The adjusting part comprises a moving rod (1), the moving rod (1) is installed in the connecting sleeve (3), one end of the moving rod (1) is connected to the pressure rod (4), and the other end of the moving rod (1) is connected to the hydraulic pull rod of the CNC lathe; The moving rod (1) is provided with a countersunk hole, in which an adjusting screw (9) is movably installed, and one end of the adjusting screw (9) is connected to the connecting sleeve (3); The adjusting screw (9) is sleeved with a spring (2), the spring (2) is located in the countersunk hole, and the adjusting screw (9) axially compresses the spring (2).

3. The CNC lathe spindle precision inner support spring chuck device according to claim 2, characterized in that: The axial compression length of the spring (2) is 3 to 5 mm.

4. The CNC lathe spindle precision inner support spring chuck device according to claim 2, characterized in that: A mounting sleeve (7) is connected between the moving rod (1) and the hydraulic pull rod of the CNC lathe; one end of the mounting sleeve (7) is connected to the moving rod (1) via a thread; and a fixing screw is connected between the other end of the mounting sleeve (7) and the hydraulic pull rod of the CNC lathe.

5. The CNC lathe spindle precision inner support spring chuck device according to claim 2, characterized in that: The elastic clamping sleeve (6) is provided with a fixing hole, and the connecting sleeve (3) is provided with a connecting hole at a position corresponding to the fixing hole, and fixing rods are installed in the connecting hole and the corresponding fixing hole.

6. The CNC lathe spindle precision inner support spring chuck device according to claim 1, characterized in that: The elastic jacket (6) is externally connected to a pressure detector, and the pressure detector is used to detect the clamping force of the elastic jacket (6) on the workpiece (8).

7. The CNC lathe spindle precision inner support spring chuck device according to claim 1, characterized in that: There is a displacement gap between the end surface of the pressure rod (4) relative to the workpiece (8) and the inner end surface of the cone sleeve (5).

8. The CNC lathe spindle precision inner support spring chuck device according to claim 7, characterized in that: The width of the displacement gap is 0.5-1 mm.

9. The CNC lathe spindle precision inner support spring chuck device according to claim 1, characterized in that: The cone sleeve (5) is made of spring tool steel.

10. The CNC lathe spindle precision inner support spring chuck device according to claim 1, characterized in that: The elastic jacket (6) is made of a material selected from the group consisting of brass and beryllium bronze.

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