Tool for machining hollow thin-wall shaft

Abstract

The utility model relates to the technical field of hollow thin-wall shaft machining, in particular to a tool for machining a hollow thin-wall shaft, which comprises a mandrel, nuts are arranged on two sides of the mandrel in a threaded manner, two first taper sleeves are arranged between the two nuts, and two expansion sleeves are arranged between the two first taper sleeves. When the tool is used for grinding the outer circle of the hollow thin-wall shaft part, disassembly and assembly are convenient, the part cannot deform, the repeated clamping precision is high, only the expansion sleeves need to be replaced for similar parts, the machining cost is low, and the universality is high; and a positive effect is achieved on application and popularization of light-weight and flexible-structure products.

Description

Technical Field

[0001] This utility model relates to the field of hollow thin-walled shaft processing technology, and more specifically, to a tooling for processing hollow thin-walled shafts. Background Technology

[0002] Hollow thin-walled shafts are a special design in the bearing industry. They feature an extremely thin bearing cross-section, enabling miniaturization and weight reduction. These bearings are typically made of high-strength materials, with rolling elements between the inner and outer rings to maintain stable operation. The design of hollow thin-walled shafts not only optimizes the system structure and reduces overall cost, but also provides excellent rotational accuracy and low friction torque. They are widely used in precision machinery fields such as aerospace, automotive, and robotics. During the machining of hollow thin-walled shafts, tooling is required for clamping and fixing.

[0003] For example, Chinese patent disclosure: A pressure sleeve tooling for hollow shafts, application number: CN202123448384.8, includes a pressure sleeve mold, a guide sleeve, a bushing, and a hollow shaft. The pressure sleeve mold is located at the bottom, the guide sleeve is coaxially arranged above the pressure sleeve mold, the bushing is coaxially sleeved on the upper end of the pressure sleeve mold, the bottom end of the hollow shaft is inserted into the upper end of the pressure sleeve mold, the bushing is located inside the hollow shaft, and the outer side of the hollow shaft abuts against the inner wall of the guide sleeve. This utility model is used to insert a bushing into the hollow shaft. After the pressure sleeve tooling is assembled, the bushing can be pressed into the hollow shaft simply by pressing it. The structure is simple and easy to use.

[0004] However, in the above technical solutions, the thin-walled hollow shaft can transmit the torque from the external gears through the internal spline, resulting in a compact structure and reduced overall machine weight, often used in lightweight gearboxes. However, it is more troublesome to machine the outer diameter, requiring tooling for auxiliary clamping. Grinding the outer diameter conventionally uses fixed mandrel clamping, but current fixed mandrel clamping systems are cumbersome, lack versatility, often requiring several sets of mandrels for a single dimension, and cannot adjust the tension force. Furthermore, tooling disassembly and assembly can easily deform the parts. Utility Model Content

[0005] The main objective of this invention is to provide a tooling for machining hollow thin-walled shafts. This tooling effectively solves the problem in the prior art where thin-walled hollow shafts can transmit torque via internal splines, resulting in a compact structure and reduced overall machine weight, often used in lightweight gearboxes. However, machining the outer diameter is cumbersome, requiring tooling for auxiliary clamping. While fixed mandrel clamping is conventionally used for grinding outer diameters, current fixed mandrel clamping methods are cumbersome, lack versatility, often requiring several sets of mandrels for a single dimension, and cannot adjust the tension force. Furthermore, tooling disassembly and assembly can easily deform the parts.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a tooling for processing hollow thin-walled shafts, including a mandrel, on both sides of the mandrel being threaded with nuts, two first tapered sleeves being disposed between the two nuts, two expansion sleeves being disposed between the two first tapered sleeves, and a second tapered sleeve and a spacer sleeve being disposed between the two expansion sleeves.

[0007] Preferably, the mandrel includes a mandrel shank, and mandrel heads are provided on both sides of the mandrel shank.

[0008] Preferably, a positioning ring is provided between the two mandrel heads, and a number of support rings of different sizes are provided on one side of the positioning ring.

[0009] Preferably, the positioning ring is fixedly connected to the mandrel shank.

[0010] Preferably, the different support rings are connected by threads.

[0011] Preferably, the diameter of the support ring gradually decreases on the side furthest from the positioning ring.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) When using this utility model, the mandrel is passed through the spline inner hole of the hollow thin-walled shaft. A spacer sleeve is installed at the left end, followed by the first tapered sleeve and the expansion sleeve. Then, the nut at the left end is installed and pre-tightened. Next, the expansion sleeve, tapered sleeve, first tapered sleeve, and nut at the right end are installed and pre-tightened. After aligning the runout of the mandrel's outer diameter on the machine tool, the runout of the workpiece's outer diameter is checked to ensure it meets the machining requirements. After adjustment, the nuts at both ends are locked. When disassembly is required, the nuts at both ends are loosened for disassembly. It has strong versatility, and the difference in inner hole dimensions is within... Within two millimeters, no tooling change is required; for millimeters exceeding two millimeters, the problem can be solved by replacing the expansion sleeve. The machining cost is low, and clamping is convenient. The part can be easily removed by loosening the locking nuts at both ends. Disassembly and assembly will not deform the part, and repeated clamping accuracy is high. Therefore, this tooling is convenient for grinding the outer diameter of hollow thin-walled shaft parts, preventing part deformation and ensuring high repeated clamping accuracy. For similar parts, only the expansion sleeve needs to be replaced, resulting in low machining costs and strong versatility. It plays a positive role in promoting the use of lightweight and flexible structural products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the tooling for machining hollow thin-walled shafts according to the present invention;

[0015] Figure 2 This is a schematic diagram of the mandrel structure in a tooling for machining hollow thin-walled shafts according to the present invention.

[0016] In the diagram: 1. Mandrel; 101. Mandrel shank; 102. Mandrel head; 103. Positioning ring; 104. Support ring; 2. Nut; 3. First tapered sleeve; 4. Expansion sleeve; 5. Second tapered sleeve; 6. Spacer sleeve. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0018] like Figure 1 As shown, a tooling for machining hollow thin-walled shafts includes a mandrel 1, on both sides of the mandrel 1 being threaded with nuts 2, two first tapered sleeves 3 being disposed between the two nuts 2, two expansion sleeves 4 being disposed between the two first tapered sleeves 3, and a second tapered sleeve 5 and a spacer sleeve 6 being disposed between the two expansion sleeves 4.

[0019] like Figure 2 As shown, in another embodiment of the present invention, the mandrel 1 includes a mandrel handle 101, and mandrel heads 102 are provided on both sides of the mandrel handle 101.

[0020] A positioning ring 103 is provided between the two spindle heads 102, and a plurality of support rings 104 of different sizes are provided on one side of the positioning ring 103;

[0021] When it is necessary to adjust the length of the support ring 104 according to the specific conditions of the inner hole of the hollow thin-walled shaft spline, different support rings 104 can be rotated to extend or shorten them, thereby adjusting the length of the support ring 104 according to the specific conditions of the inner hole of the hollow thin-walled shaft spline and expanding the applicable range.

[0022] The working principle of this tooling for machining hollow thin-walled shafts:

[0023] In use, the mandrel 1 is passed through the splined inner hole of the hollow thin-walled shaft. The spacer sleeve 6 is installed at the left end, followed by the first tapered sleeve 3 and the expansion sleeve 4. The nut 2 at the left end is then installed and pre-tightened. Next, the expansion sleeve 4, the first tapered sleeve 3, and the nut 2 at the right end are installed and pre-tightened. After aligning the runout of the outer diameters of the mandrel 1 on the machine tool, the runout of the workpiece's outer diameter is checked to ensure it meets the machining requirements. After adjustment, the nuts 2 at both ends are tightened. Disassembly is possible by loosening the nuts at both ends. This method offers high versatility and can accommodate variations in inner hole dimensions. Within two millimeters, no tooling change is required; beyond two millimeters, the problem can be solved by replacing the expansion sleeve. The processing cost is low, and clamping is convenient. The part can be easily removed by loosening the locking nuts at both ends. Disassembly and assembly will not deform the part, and the repeat clamping accuracy is high. Therefore, when grinding the outer diameter of hollow thin-walled shaft parts, this tooling is easy to disassemble and assemble, will not deform the part, and has high repeat clamping accuracy. For similar parts, only the expansion sleeve needs to be replaced. The processing cost is low and the versatility is strong. It will play a positive role in the use and promotion of lightweight and flexible structure products.

[0024] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A tooling for machining hollow thin-walled shafts, comprising a mandrel (1), characterized in that: Nuts (2) are threaded on both sides of the mandrel (1). Two first tapered sleeves (3) are provided between the two nuts (2). Two expansion sleeves (4) are provided between the two first tapered sleeves (3). A second tapered sleeve (5) and a spacer sleeve (6) are provided between the two expansion sleeves (4).

2. The tooling for machining hollow thin-walled shafts according to claim 1, characterized in that: The mandrel (1) includes a mandrel shank (101), and mandrel heads (102) are provided on both sides of the mandrel shank (101).

3. The tooling for machining hollow thin-walled shafts according to claim 2, characterized in that: A positioning ring (103) is provided between the two spindle heads (102), and a number of support rings (104) of different sizes are provided on one side of the positioning ring (103).

4. The tooling for machining hollow thin-walled shafts according to claim 3, characterized in that: The positioning ring (103) is fixedly connected to the mandrel shank (101).

5. The tooling for machining hollow thin-walled shafts according to claim 4, characterized in that: The different support rings (104) are connected by threads.

6. The tooling for machining hollow thin-walled shafts according to claim 5, characterized in that: The diameter of the support ring (104) on the side away from the positioning ring (103) gradually decreases.

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