Inner support chuck structure of high-precision numerical control lathe

Abstract

The utility model discloses an inner supporting chuck structure of a high-precision numerical control lathe, relates to the technical field of clamping structures, and aims to solve the problems that a traditional inner supporting chuck is uneven in clamping force distribution and poor in adaptability. The structure comprises a pull rod, the pull rod is sleeved with two mirror symmetry inner supporting assemblies, a connecting piece is arranged between the two inner supporting assemblies, and a mounting base is arranged at the lower end of the connecting piece. The connecting piece comprises a disc and semi-ellipsoids fixed on the upper and lower sides of the disc; the inner supporting assembly comprises an expansion sleeve, a rod sleeve fixed to the expansion sleeve and a ball, and the ball rolls between the inner wall of the expansion sleeve and the outer wall of the rod sleeve and abuts against the semi-ellipsoid. During working, the pull rod moves to enable the inner supporting assemblies to get close to each other, the semiellipsoids extrude the balls, and the expansion sleeve expands in the circumferential direction to clamp workpieces of different specifications. The semi-ellipsoids which are evenly distributed are matched with the balls, so that clamping force is evenly distributed, adaptability and flexibility are improved, replacement and adjustment of the chuck are reduced, production efficiency is improved, production cost is reduced, and market competitiveness of enterprises is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of clamping structure technology, specifically to an internal support chuck structure for a high-precision CNC lathe. Background Technology

[0002] In the field of machining, high-precision CNC lathes are key equipment for ensuring the accuracy and quality of parts machining. The internal support chuck, as an important component in high-precision CNC lathes used to hold workpieces, directly affects the machining effect due to its structural rationality and performance stability.

[0003] Traditional internal support chucks typically clamp workpieces at one end, resulting in uneven force distribution. This can easily lead to excessive localized stress and deformation of the workpiece, severely impacting machining quality and subsequent performance. Furthermore, traditional internal support chucks lack adaptability and flexibility when handling workpieces of different sizes. For example, double-tapered internal support chucks often have insufficient deformation capacity, requiring frequent chuck changes or complex adjustments, significantly reducing production efficiency.

[0004] In view of the above-mentioned shortcomings of the traditional internal support chuck structure, a high-precision CNC lathe internal support chuck structure is proposed. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides an internal support chuck structure for high-precision CNC lathes, which has the advantages of uniform clamping force distribution and high adaptability, and solves the problems of workpiece deformation, poor adaptability and flexibility caused by uneven clamping force distribution in traditional internal support chucks.

[0007] (II) Technical Solution

[0008] To achieve the aforementioned goals of uniform clamping force distribution and high adaptability, this utility model provides the following technical solution:

[0009] An internal support chuck structure for a high-precision CNC lathe includes a tie rod, on which two sets of mirror-symmetrical internal support components are sleeved. The tie rod is also sleeved with a connector located between the two sets of internal support components and a mounting base located at the lower end of the two internal support components.

[0010] The connector includes a disk and several hemispherical bodies fixedly installed on the upper and lower sides of the disk.

[0011] One set of the inner support components includes a tension sleeve, a rod sleeve with one end fixed to the tension sleeve, and a plurality of balls, the balls being recessed and rolling between the inner wall of the tension sleeve and the outer wall of the rod sleeve;

[0012] The end of the hemispherical body away from the disk abuts against the recesses of two adjacent balls;

[0013] The top of the mounting base abuts against the bottom of the inner support assembly below.

[0014] The preferred technical solution of this utility model is that the pull rod includes a round rod and an end block fixed to the upper end of the round rod, the rod sleeves are all sleeved with the round rod, and the end block is limited to the upper end of the rod sleeve.

[0015] The preferred technical solution of this utility model is that the pull rod further includes a locking block one fixed to the bottom end of the end block, and the opposite ends of the two rod sleeves are each equipped with a sleeve end located inside the expansion sleeve. The sleeve end is provided with a locking groove, and the locking block one cooperates with the locking groove on the side near the end block.

[0016] The preferred technical solution of this utility model is that a second locking block is provided at the top of the mounting base, and the second locking block cooperates with a locking groove on the side near the mounting base.

[0017] The preferred technical solution of this utility model is that the expansion sleeve has a groove and can expand circumferentially by the extrusion of the balls.

[0018] A preferred embodiment of this invention is that the mounting base has a plurality of mounting holes.

[0019] The preferred technical solution of this utility model is that the number of the same cooperating balls and semi-ellipsoids are equal and they are all distributed in a linear array about the axis of the round rod.

[0020] The preferred technical solution of this utility model is that when the expansion sleeve is deformed to its minimum, its outer diameter is greater than that of the disk, and when the expansion sleeve is deformed to its maximum, the ball is always trapped between the inner wall of the expansion sleeve and the outer wall of the rod sleeve.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, this utility model provides an internal support chuck structure for a high-precision CNC lathe, which has the following advantages:

[0023] The internal support chuck structure of this high-precision CNC lathe features two sets of mirror-symmetrical internal support components. These components, along with evenly distributed semi-ellipsoids on the connecting parts, abut against the balls. As the two sets of internal support components approach each other, the semi-ellipsoids compress the balls, and the expansion sleeve expands circumferentially to provide internal support for workpieces of different specifications. Compared to traditional internal support fixtures, this structure allows for greater deformation, eliminating the need for frequent chuck replacements or complex adjustments. This significantly improves production efficiency, reduces time and labor costs, and enhances the company's competitiveness in the market. Attached Figure Description

[0024] Figure 1This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is an exploded view of the overall structure of this utility model;

[0026] Figure 3 This is a side view of the overall appearance of this utility model;

[0027] Figure 4 This is a cross-sectional view of the overall structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the two sets of internal support components in this utility model.

[0029] In the diagram: 1. Tie rod; 11. Round rod; 12. End block; 13. Locking block one; 2. Inner support assembly; 21. Expansion sleeve; 211. Groove; 22. Rod sleeve; 221. Sleeve end; 23. Ball bearing; 3. Connector; 31. Disc; 32. Semi-ellipsoid; 4. Mounting base; 41. Mounting hole; 42. Locking block two; 5. Slot. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Please see Figure 1-5An internal support chuck structure for a high-precision CNC lathe includes a pull rod 1, two sets of mirror-symmetrical internal support components 2 are sleeved on the pull rod 1, a connector 3 located between the two sets of internal support components 2 and a mounting base 4 located at the lower end of the two internal support components 2 are also sleeved on the pull rod 1.

[0034] The connector 3 includes a disk 31 and several semi-ellipsoids 32 fixedly installed on the upper and lower sides of the disk 31;

[0035] A set of inner support components 2 includes a sleeve 21, a rod sleeve 22 with one end fixed to the sleeve 21, and a number of balls 23. The balls 23 are recessed and roll between the inner wall of the sleeve 21 and the outer wall of the rod sleeve 22.

[0036] The end of the semi-ellipsoid 32 away from the disk 31 abuts against the recesses of the two adjacent balls 23;

[0037] The top of the mounting base 4 abuts against the bottom of the inner support component 2 below.

[0038] It should be noted that the internal support chuck structure of this high-precision CNC lathe uses two sets of mirror-symmetrical internal support components 2, which are connected to the ball bearings 23 by the evenly distributed semi-ellipsoids 32 on the connecting piece 3. When the two sets of internal support components 2 approach each other, the semi-ellipsoids 32 squeeze the ball bearings 23, and the expansion sleeve 21 expands circumferentially to internally support workpieces of different specifications. Compared with traditional internal support fixtures, this structure has a greater degree of deformation, eliminates the need for frequent chuck replacements or complex adjustments, significantly improves production efficiency, reduces time and labor costs, and enhances the company's competitiveness in the market.

[0039] It should be further explained that when the expansion sleeve 21 is at its maximum deformation, the ball 23 should always roll and sink between the expansion sleeve 21 and the rod sleeve 22. The sinking between the expansion sleeve 21 and the rod sleeve 22 can ensure the connection stability between the expansion sleeve 21 and the rod sleeve 22.

[0040] In this embodiment, the pull rod 1 includes a round rod 11 and an end block 12 fixed to the upper end of the round rod 11. The rod sleeve 22 is sleeved with the round rod 11, and the end block 12 is limited to the upper end of the rod sleeve 22.

[0041] It should be noted that the end block 12 provides an upper limit position for the sleeve 22, ensuring that the sleeve 22 will not move excessively upward on the pull rod 1, thus ensuring the relative position stability of the inner support assembly 2 on the pull rod 1. This provides a basic structural guarantee for the normal operation of the subsequent inner support clamp structure and avoids affecting the clamping effect of the inner support assembly 2 on the workpiece due to the unstable position of the sleeve 22.

[0042] It should be further explained that the bottom end of the pull rod 1 is connected to the traction device, which can be pneumatic traction or mechanical traction. It should also be emphasized that the connection between the pull rod 1 and the traction device is a common technology in this field, such as double-tapered internal support clamps, so it will not be elaborated here.

[0043] In this embodiment, the pull rod 1 also includes a locking block 13 fixed to the bottom of the end block 12. The opposite ends of the two rod sleeves 22 are each equipped with a sleeve end 221 located inside the expansion sleeve 21. The sleeve end 221 is provided with a locking groove 5. The locking block 13 cooperates with the locking groove 5 on the side near the end block 12.

[0044] It should be noted that the cooperation between the locking block 13 and the slot 5 can effectively connect and position the pull rod 1 with the upper inner support assembly 2. When the pull rod 1 is subjected to axial force, the locking block 13 can transmit the force to the upper inner support assembly 2, ensuring that the two sets of inner support assemblies 2 can move synchronously and stably along the axial direction of the pull rod 1, thereby realizing the clamping action of the inner support chuck on the workpiece, and enhancing the transmission stability and clamping reliability of the entire inner support chuck structure.

[0045] In this embodiment, a second locking block 42 is provided at the top of the mounting base 4, and the second locking block 42 cooperates with the locking groove 5 on the side near the mounting base 4.

[0046] It should be noted that the second locking block 42 engages with the slot 5 on the sleeve end 221 of the lower inner support component 2, ensuring a tight connection between the mounting base 4 and the lower inner support component 2, providing stable lower support for the entire inner support chuck structure. During workpiece clamping, the mounting base 4 bears the force from the lower inner support component 2 through the second locking block 42, ensuring the overall stability of the inner support chuck structure during operation and preventing decreased clamping accuracy or structural damage due to unstable lower support.

[0047] In this embodiment, the expansion sleeve 21 has a groove 211 and can expand circumferentially by the extrusion of the ball 23.

[0048] It should be noted that the design of the groove 211 on the expansion sleeve 21 provides deformation space for its circumferential expansion. When the ball 23 is compressed by the semi-ellipsoid 32, the ball 23 transmits the force to the expansion sleeve 21, causing the expansion sleeve 21 to deform at the groove 211 and expand circumferentially. This allows it to adapt to the inner holes of workpieces of different specifications and shapes, achieving effective internal support clamping of the workpiece. This expandable design greatly improves the adaptability and flexibility of the internal support chuck structure, reducing the hassle of frequently changing chucks due to different workpiece specifications.

[0049] In this embodiment, the mounting base 4 has a plurality of mounting holes 41.

[0050] It should be noted that the purpose of mounting hole 41 is to facilitate the installation of the entire internal support chuck structure onto the spindle of a high-precision CNC lathe or other designated positions. Through mounting hole 41, the mounting base 4 can be firmly connected to the lathe body using bolts or other fasteners, ensuring that the internal support chuck structure will not loosen or shift during operation, thus guaranteeing the accuracy and stability of workpiece clamping. It also facilitates the disassembly, maintenance, and replacement of the internal support chuck structure.

[0051] In this embodiment, the number of the same cooperating balls 23 and the semi-ellipsoids 32 are equal and they are all distributed in an array about the axis of the round rod 11.

[0052] It should be noted that this design, with its equal number and array distribution, ensures that the compressive force exerted by the semi-ellipsoids 32 on the balls 23 is evenly distributed throughout the entire inner support chuck structure. When the pull rod 1 moves the inner support assembly 2, each ball 23 receives a relatively uniform compressive force from the semi-ellipsoids 32, thereby ensuring that the expansion of each part of the expansion sleeve 21 is consistent. This guarantees that the clamping force is evenly distributed on the workpiece, avoiding workpiece deformation due to uneven clamping force, and improving the workpiece's machining quality and clamping stability.

[0053] In this embodiment, when the expansion sleeve 21 is deformed to its minimum, its outer diameter is greater than that of the disk 31. When the expansion sleeve 21 is deformed to its maximum, the ball 23 is always trapped between the inner wall of the expansion sleeve 21 and the outer wall of the rod sleeve 22.

[0054] It should be noted that this design ensures that the disk 31 will not interfere with the expansion of the expansion sleeve 21 when it expands circumferentially to internally clamp the workpiece. Simultaneously, the expansion sleeve 21 can fully contact the inner hole of the workpiece during expansion, providing sufficient clamping area to guarantee the firmness and stability of the clamping. If the minimum outer diameter of the expansion sleeve 21 during deformation is smaller than the outer diameter of the disk 31, the expansion of the expansion sleeve 21 may be obstructed by the disk 31, resulting in the inability to properly clamp the workpiece or insufficient clamping force.

[0055] Working principle: During operation, the internal support chuck structure of this high-precision CNC lathe is first installed onto the spindle of the high-precision CNC lathe through the mounting holes 41 on the mounting base 4. When it is necessary to clamp the workpiece, the pull rod 1 moves under the drive of the lathe.

[0056] Since the end block 12 on the pull rod 1 is located at the upper end of the sleeve 22, and the locking block 13 cooperates with the locking groove 5 near the end block 12, as the pull rod 1 moves downward, it will drive the inner support assembly 2 above to move downward synchronously. At this time, the semi-ellipsoids 32 on the upper and lower sides of the disc 31 of the connector 3 located between the two sets of inner support assemblies 2 begin to exert a squeezing effect on the balls 23 in the two sets of inner support assemblies 2.

[0057] Because the ball 23 is recessed and rolls between the inner wall of the expansion sleeve 21 and the outer wall of the rod sleeve 22, and the expansion sleeve 21 has a groove 211, under the compression of the semi-ellipsoid 32, the ball 23 will transmit the force to the expansion sleeve 21, causing the expansion sleeve 21 to expand in the circumferential direction, thereby achieving internal support for the workpiece.

[0058] After processing is completed, the tie rod 1 moves upward under the drive of the lathe, which drives the inner support assembly 2 above to move upward. The squeezing force of the semi-ellipsoid 32 on the ball 23 decreases, and the expansion sleeve 21 gradually returns to its original shape under its own elasticity. The clamping of the workpiece is released, and the processed workpiece can be taken out to prepare for the next clamping and processing operation.

[0059] 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 high-precision numerical control lathe inner support chuck structure comprising a pull rod, characterized in that: The tie rod is fitted with two sets of mirror-symmetrical inner support components, and the tie rod is also fitted with a connector located between the two sets of inner support components and a mounting base located at the lower end of the two inner support components. The connector includes a disk and several hemispherical bodies fixedly installed on the upper and lower sides of the disk. One set of the inner support components includes a tension sleeve, a rod sleeve with one end fixed to the tension sleeve, and a plurality of balls, the balls being recessed and rolling between the inner wall of the tension sleeve and the outer wall of the rod sleeve; The end of the hemispherical body away from the disk abuts against the recesses of two adjacent balls; The top of the mounting base abuts against the bottom of the inner support assembly below.

2. The inner support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: The pull rod includes a round rod and an end block fixed to the upper end of the round rod. All the rod sleeves are connected to the round rod, and the end block is limited to the upper end of the rod sleeve.

3. The inner support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: The pull rod also includes a locking block 1 fixed to the bottom of the end block. Both opposite ends of the two rod sleeves are equipped with sleeve ends located inside the expansion sleeve. The sleeve ends are provided with locking grooves, and the locking block 1 cooperates with the locking groove on the side near the end block.

4. The inner support chuck structure of a high-precision numerical control lathe according to claim 3, characterized in that: The top of the mounting base is provided with a second locking block, which cooperates with a slot on the side near the mounting base.

5. The inner support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: The expansion sleeve has grooves and can expand circumferentially by the compression of the balls.

6. The internal support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: The mounting base has several mounting holes.

7. The internal support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: The number of the same cooperating balls and semi-ellipsoids is equal and they are all distributed in a linear array about the axis of the round rod.

8. The internal support chuck structure of a high-precision numerical control lathe according to claim 1, characterized in that: When the expansion sleeve is deformed to its minimum, its outer diameter is larger than that of the disk. When the expansion sleeve is deformed to its maximum, the ball bearing is always trapped between the inner wall of the expansion sleeve and the outer wall of the rod sleeve.

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