A turning clamping device for thin-walled long tubes
By designing a turning clamping device for thin-walled long tubes, and utilizing a combination of elastic clamping parts and rolling rings, the problem of thin-walled long tubes being unable to be machined on a lathe was solved, achieving stable machining and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI JIANGLING CHASSIS CO LTD
- Filing Date
- 2025-08-07
- Publication Date
- 2026-07-31
AI Technical Summary
In the existing technology, thin-walled long tubes cannot be effectively processed on a lathe, and boring requires special equipment, resulting in high production costs and insufficient production capacity.
A turning clamping device for thin-walled long tubes is adopted, which utilizes a combination of elastic clamping parts and rolling rings, and adjusts the clamping force by squeezing bolts to achieve uniform clamping and avoid stress concentration and local deformation.
It enables stable machining of thin-walled long tubes on a lathe, reduces production costs, improves production efficiency, and avoids the risk of pinching.
Smart Images
Figure CN224575201U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of mechanical tooling structures, and in particular to a turning clamping device for thin-walled long tubes. Background Technology
[0002] In the automotive manufacturing industry, reducing vehicle weight and saving manufacturing costs are long-term goals. When using raw tubing in product design, the pipe diameter is often artificially increased due to the need for clamping references during machining, leading to increased costs.
[0003] However, when the weight control of the vehicle body does not allow for an increase in the diameter of the product tube, some thin-walled long tubes cannot be machined on a lathe. If the inner hole is machined directly by holding the outer circle of the blank through the center rest, it is simply impossible to do so due to the irregularity of the outer circle of the blank.
[0004] Typically, boring is the only machining method available, but boring requires specialized boring equipment, such as horizontal boring machines and horizontal machining centers. Firstly, the machining time per piece is long, and the production cost is significantly higher than that of lathes. Secondly, boring equipment is far less widely used than CNC lathes, resulting in a severe shortage of production capacity. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a turning clamping device for thin-walled long tubes.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A turning clamping device for thin-walled long tubes includes an elastic clamping body sleeved on the outside of the workpiece. The elastic clamping body includes an elastic clamping part and a clamping main body part. An elastic clamping opening is formed in the middle of the elastic clamping part and is located in the outer periphery of the workpiece. A rolling ring is sleeved on the outside of the elastic clamping part, and an end nut is sleeved on the outside of the main body of the clamp. A clamping bolt is installed on the side of the end nut, and the end of the clamping bolt tends to abut against one side of the rolling ring. When the compression bolt is screwed into the end nut, its end can push the rolling ring, causing the rolling ring to radially compress the elastic clamping part, thereby changing the size of the elastic clamping opening.
[0007] Furthermore, a set bolt is installed on the circumferential surface of the end nut, and the end of the set bolt abuts against the surface of the main body of the fixture to form circumferential positioning between the two.
[0008] Furthermore, multiple key pins are installed at the connection between the elastic clamping part and the main body of the fixture, with the heads of the key pins extending into the elastic clamping opening and contacting the surface of the workpiece.
[0009] Furthermore, the tail of the key pin is located on the inner side of the inner wall of the rolling ring.
[0010] Furthermore, the inner wall of the rolling ring is an irregular circle. After the rolling ring is fitted onto the outside of the elastic clamp, the distance between its inner wall and the central axis of the elastic clamp is inconsistent. The key is used to transmit the torque between the rolling ring and the elastic clamp and prevent them from sliding circumferentially against each other.
[0011] Furthermore, the elastic clamping part is trumpet-shaped, and multiple openings are formed on the elastic clamping part.
[0012] The beneficial effects of this utility model are as follows: This application achieves clamping through radial uniform extrusion of the rolling ring. This avoids the concentrated stress and local deformation caused by traditional chuck direct clamping or threaded locking methods; the elastic clamping part (trumpet-shaped, open groove design) can deform uniformly, distributing the clamping force to a larger contact surface around the workpiece circumference, greatly reducing the risk of thin-walled tubes being flattened or damaged.
[0013] The extrusion bolt of this application provides a controllable and adjustable clamping force. By controlling the screwing depth, the operator can precisely control the pressure applied to the rolling ring, thereby controlling the deformation of the elastic clamping part and the final clamping force to adapt to different working conditions. Attached Figure Description
[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Figure 1 This is a cross-sectional schematic diagram of this application.
[0015] Figure 2 This is a schematic cross-sectional view of the elastic clamp in this application. Detailed Implementation
[0016] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0017] Reference Figure 1 , Figure 2A turning clamping device for thin-walled long tubes includes an elastic clamping body 1 sleeved on the outside of a workpiece 7 (thin-walled long tube). The elastic clamping body 1 includes an elastic clamping part 11 and a clamping body part 12. An elastic clamping opening 13 is formed in the middle of the elastic clamping part 11. The elastic clamping part 11 is trumpet-shaped and has multiple opening slots 14. The elastic clamping opening 13 is located in the outer area of the workpiece 7. A rolling ring 2 is sleeved on the outside of the elastic clamping part 11, and an end nut 4 is sleeved on the outside of the clamping body part 12. A pressing bolt 5 is installed on the side of the end nut 4, and the end of the pressing bolt 5 tends to abut against one side of the rolling ring 2. When the compression bolt 5 is screwed into the end nut 4, its end can push the rolling ring 2, so that the rolling ring 2 radially compresses the elastic clamping part 11 to change the size of the opening of the elastic clamping port 13, thereby clamping and fixing the workpiece 7.
[0018] Furthermore, a set bolt 6 is installed on the circumferential surface of the end nut 4, and the end of the set bolt 6 abuts against the surface of the fixture body 12 to form circumferential positioning between the two.
[0019] Furthermore, multiple key pins 3 are installed at the connection between the elastic clamping part 11 and the main body of the fixture 12. The head of the key pin 3 extends into the elastic clamping opening 13 and abuts against the surface of the workpiece 1. The tail of the key pin 3 is located inside the inner wall of the rolling ring 2. The inner wall surface of the rolling ring 2 is an irregular circle. After the rolling ring 2 is sleeved on the outside of the elastic fixture 1, the distance between each point on its inner wall surface and the central axis of the elastic fixture 1 is inconsistent. When the rolling ring 2 has a tendency to rotate, its inner wall surface will squeeze the key pin 3. The key pin 3 is used to transmit the torque between the rolling ring 2 and the elastic fixture 1 and prevent the two from sliding circumferentially against each other.
[0020] Taking the JMEV06CS1-B1 axle tube of the Jiangling E50 pure electric vehicle as an example. The total length of this axle tube is 1157±0.5 MM, the outer diameter is Ф51MM, the inner diameter is Ф43MM (wall thickness 4MM); each end face has a 30° welding bevel and an inner hole with a diameter of Ф44.2MM (+0.015~+0.006), a depth of 20MM, and Ra6.3; the CNC machine tool used is CAK6150D.
[0021] The turning device for thin-walled long tubes forces the rolling ring 2 forward and weds it into the conical surface of the elastic clamp 1 by tightening the four extrusion bolts 5 on the end face nut 4. This causes the inner cavity of the elastic clamp 1 to shrink and clamp the outer circle of the workpiece 7, ultimately allowing the workpiece 7 to be tightly locked with the rolling ring 2 through the elastic clamp 1.
[0022] When the machine tool spindle drives the workpiece 7 to rotate, the other end of the workpiece 7 rotates in the center frame through the rolling ring 2, thereby realizing turning.
[0023] The dimensions of the turning device in this embodiment are as follows: The outer diameter of the rolling ring 2 is Ф100MM, the width is 50MM, the roughness is Ra0.8, and the roundness is 0.01MM; the inner diameter is Ф68MM (+0.06, +0.04), the inner cone angle is 15º±0.1, the roughness is Ra0.8, the major diameter is Ф88.3MM, and the minor diameter is connected to the inner hole; The end nut 4 is an external hexagon with a side distance of 108 mm, a diagonal distance of 124.7 mm, and a width of 32 mm; it has two internal threads of M64; two M10 through thread holes are symmetrically arranged on the side; and four M10 through thread holes are evenly distributed on the end face.
[0024] The elastic clamp body 1 has a total length of 88 mm, an inner diameter of Ф51.5 mm (+0.2, 0), a cylindrical diameter of Ф68 mm (-0.02, -0.04), a conical angle of 15º±0.1, a length of 28 mm, a surface roughness of Ra0.8, 16 grooves with a groove width of 3 mm are cut on the conical surface, and an annular groove with a depth to the bottom diameter of Ф56 mm and a width of 6 mm is cut at the intersection of the conical surface and the cylindrical surface; the external thread is M64X2, and the effective length is 27.6 mm.
[0025] In this embodiment, the elastic inner cavity of the elastic clamp 1 contacts the workpiece. By screwing in the four clamping bolts 5 on the end face nut 4, the elastic clamp 1 and the conical surface of the rolling ring 2 are forced to wedge into each other, causing the inner cavity of the elastic clamp 1 to shrink and clamp the outer circle of the workpiece 7, thus forming a tight lock between the workpiece 7 and the rolling ring 2. When the machine tool spindle drives the other end of the workpiece 7 to rotate, the workpiece 7 drives the rolling ring 2 to rotate within the center rest, thereby meeting the turning kinetic energy requirements.
[0026] The rotation of the device is achieved through the rolling ring 2, and the outer circle of the rolling ring 2 is precision machined to ensure its smooth rotation on the central frame. The ellipticity and dimensional deviation of the outer circle of the workpiece 7 blank are all contained and absorbed by the elastic inner cavity of the elastic fixture 1, which has no impact on the rotation accuracy. Thus, the process of turning thin-walled long tubes on a lathe is realized.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A turning clamping device for thin-walled long tubes, comprising an elastic clamping body sleeved on the outside of the workpiece, wherein, The elastic clamp includes an elastic clamping part and a clamping body part. An elastic clamping opening is formed in the middle of the elastic clamping part, and the elastic clamping opening is located in the outer area of the workpiece. The feature is that a rolling ring is sleeved on the outside of the elastic clamping part, an end face nut is sleeved on the outside of the clamping body part, a pressing bolt is installed on the side of the end face nut, and the end of the pressing bolt tends to abut against one side of the rolling ring. When the extrusion bolt is screwed into the end face nut, its end can push the rolling ring, causing the rolling ring to radially extrude the elastic clamping part, thereby changing the diameter of the elastic clamping opening.
2. The turning clamping device for thin-walled long tubes according to claim 1, characterized in that, A set bolt is installed on the circumferential surface of the end nut, and the end of the set bolt abuts against the surface of the main body of the clamp to form circumferential positioning between the two.
3. The turning clamping device for thin-walled long tubes according to claim 1, characterized in that, Multiple key pins are installed at the connection between the elastic clamping part and the main body of the fixture, and the head of the key pin extends into the elastic clamping opening and abuts against the surface of the workpiece.
4. The turning and clamping device for thin-walled long tubes according to claim 3, characterized in that, The tail of the key pin is located on the inner side of the inner wall of the rolling ring.
5. The turning and clamping device for thin-walled long tubes according to claim 4, characterized in that, The inner wall of the rolling ring is an irregular circle. After the rolling ring is sleeved on the outside of the elastic clamping body, the distance between its inner wall and the central axis of the elastic clamping body is not consistent. The key pin is used to transmit the torque between the rolling ring and the elastic clamping body to prevent them from sliding circumferentially against each other.
6. The turning clamping device for thin-walled long tubes according to claim 1, characterized in that, The elastic clamping part is trumpet-shaped, and multiple openings are formed on the elastic clamping part.