Thin-wall cylindrical part inner hole turning clamping structure

Abstract

A thin-wall cylindrical part inner hole turning clamping structure comprises a clamping body, a clamping sleeve and a screw rod, and the clamping body comprises a base and a sleeve; the clamping sleeve is sleeved on the sleeve, and the screw rod is arranged on the clamping sleeve. Through the structural design of the clamping body, the clamping sleeve and the screw rod, the clamping sleeve is adopted for fastening connection, the structure is simple, the clamping device is suitable for clamping the inner hole of the thin-wall cylindrical part, the clamping device is high in alignment efficiency and small in clamping stress, the thin-wall cylindrical part is uniform in stress and small in deformation, the thin-wall cylindrical part does not deform during disassembly, and the production efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of machining auxiliary devices, and in particular relates to a clamping structure for turning the inner hole of a thin-walled cylindrical part. Background Technology

[0002] Thin-walled cylindrical parts are widely used in the aerospace field. These parts have thin walls and poor rigidity, making them highly susceptible to severe deformation during machining, resulting in dimensional deviations and low yield rates. Deformation control primarily employs roughing, semi-finishing, and finishing processes, along with artificial aging for stress relief. However, some deformation still exists, making it difficult to meet design requirements, and resulting in low machining efficiency and high manufacturing costs. Research on deformation control of thin-walled parts is of great significance to the technological advancement of my country's equipment manufacturing industry.

[0003] However, existing technologies for cylindrical thin-walled parts, such as those with an outer diameter of Φ124mm, a total length of 180mm, a wall thickness of only 2mm, no reinforcing ribs on the inner and outer surfaces, no end frame structure, low rigidity and strength, and high precision requirements (H7 grade tolerance for the inner diameter), require clamping with pressure plates and other methods when machining the inner hole. Due to the clamping force, the part undergoes severe deformation, resulting in an elliptical cross-section, low machining accuracy, and difficulty in ensuring dimensional accuracy, ultimately affecting product assembly requirements. In mass production, using multiple combined fixtures results in low clamping efficiency, difficulty in meeting production schedules, uneven clamping forces, poor product consistency, and a high risk of product scrap and unusable parts.

[0004] Therefore, conducting research on deformation control of thin-walled parts is of great significance to the technological progress of my country's equipment industry. It is also necessary to design a device that is suitable for the internal turning and clamping of thin-walled cylindrical parts, and that produces thin-walled cylindrical parts with small deformation, uniform stress, simple operation, and high clamping reliability, in order to solve the problems existing in the current technology. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a clamping structure for turning the inner hole of a thin-walled cylindrical part, including a clamping body, a clamping sleeve, and a screw. The clamping body includes a base and a sleeve; the clamping sleeve is fitted onto the sleeve, and the screw is disposed on the clamping sleeve.

[0006] Furthermore, the base is used to clamp onto a three-jaw chuck, and the sleeve is used to clamp the thin-walled cylindrical part to be processed.

[0007] Furthermore, the inner diameter of the sleeve matches the outer diameter of the thin-walled cylindrical part, and the end face of the sleeve contacts the left side of the outer circular process ring rib provided on the thin-walled cylindrical part, which is used to limit the movement of the thin-walled cylindrical part.

[0008] Furthermore, the clamping sleeve has a threaded hole and an inward boss inside. The threaded hole is used to connect with the external thread on the outside of the sleeve. The boss contacts the right side of the outer circular process ring rib on the thin-walled cylindrical part and is used to clamp the outer circular process ring rib between the sleeve and the boss.

[0009] Furthermore, the height of the boss is equal to the wall thickness of the sleeve.

[0010] Furthermore, the outer circumference of the clamping sleeve is symmetrically provided with threaded mounting holes for mounting screws.

[0011] Furthermore, the outer surface of the screw is provided with an external thread that mates with the threaded mounting hole, and the outer surface of the screw is provided with knurling on the external thread portion.

[0012] Furthermore, the number of screws is not less than two.

[0013] In summary, the beneficial effects of this utility model are as follows: through the structural design of the clamping body, clamping sleeve, and screw, and the use of the clamping sleeve fastening connection method, the structure is simple and suitable for clamping the inner hole of thin-walled cylindrical parts, especially thin-walled cylindrical parts with a wall thickness of 2mm; and when the clamping device contacts and fastens with the thin-walled cylindrical part through the clamping sleeve fastening connection, the clamping stress generated is small, the thin-walled cylindrical part is subjected to uniform force, and the deformation is small. The thin-walled cylindrical part is not deformed during disassembly, resulting in high production efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the assembly of the thin-walled cylindrical part inner hole turning and clamping structure provided by this utility model;

[0016] Figure 2 This is a front view of the assembly of the thin-walled cylindrical part inner hole turning and clamping structure provided by this utility model;

[0017] Figure 3 This is a schematic diagram of the internal hole turning and clamping structure of the thin-walled cylindrical part provided by this utility model;

[0018] Figure 4 This is a schematic diagram of the clamping body of the thin-walled cylindrical part inner hole turning clamping structure provided by this utility model;

[0019] Figure 5 This is a schematic diagram of the clamping sleeve of the thin-walled cylindrical part inner hole turning clamping structure provided by this utility model;

[0020] Figure 6 This is a schematic diagram of the screw structure of the thin-walled cylindrical part inner hole turning and clamping structure provided by this utility model;

[0021] Figure 7 This is a schematic diagram of the structure of the thin-walled cylindrical component in an embodiment of this utility model;

[0022] Explanation of reference numerals: 1-Clamping body, 101-Base, 102-Sleeve, 2-Clamping sleeve, 201-Threaded hole, 202-Boss, 3-Screw, 4-Three-jaw chuck, 5-Thin-walled cylindrical part, 6-Mounting hole, 7-Process rib. Detailed Implementation

[0023] 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.

[0024] like Figures 1-7 As shown, this utility model embodiment provides a clamping structure for turning the inner hole of a thin-walled cylindrical part, in order to solve the problem of... Figure 7 The outer diameter shown is Φ124mm, the total length is 180mm, and the wall thickness is only 2mm. There are no reinforcing ribs or end frames on the inner and outer surfaces. The part has weak rigidity and low strength. The inner diameter tolerance is H7 grade. The turning and clamping efficiency of cylindrical thin-walled cylindrical parts with high precision requirements is low, the clamping force is uneven, the product consistency is poor, and it is easy to cause product scrap.

[0025] This embodiment provides a clamping structure for turning the inner hole of a thin-walled cylindrical part, such as... Figures 3-6 As shown, the device includes a clamping body 1, a clamping sleeve 2, and a screw 3. The clamping body 1 includes a base 101 and a sleeve 102. The clamping sleeve 2 is fitted onto the sleeve 102, and the screw 3 is mounted on the clamping sleeve 2. Through the structural design of the clamping body 1, clamping sleeve 2, and screw 3, the clamping stress on the outer surface of the thin-walled cylindrical part 5 is small and the clamping force points are uniform during clamping, resulting in minimal deformation of the thin-walled cylindrical part 5. There is almost no deformation when the clamping device is removed. The clamping device is simple, easy to operate, and has a high clamping alignment rate, further improving production efficiency. The clamping body 1, clamping sleeve 2, and screw 3 are cylindrical in shape.

[0026] The installation sequence of the thin-walled cylindrical part inner hole turning clamping structure is as follows, and after assembly, it is as follows: Figure 1 and Figure 2 As shown:

[0027] First, fix the base 101 onto the three-jaw chuck 4;

[0028] Then the thin-walled cylindrical part 5 is placed in the inner cylinder of the sleeve 102, and the end face of the sleeve 102 is in contact with the left side of the outer circle process ring rib 7 of the thin-walled cylindrical part 5.

[0029] Secondly, the clamping sleeve 2 passes through the thin-walled cylindrical part 5 and is fitted onto the outer surface of the sleeve 102. At the same time, the clamping sleeve 2 contacts and is positioned with the right side of the process ring rib 7, and radially tightens the thin-walled cylindrical part 5.

[0030] Finally, the screw 3 is manually turned to tighten the inner hole turning clamping device of the thin-walled cylindrical part.

[0031] The outer circular process rib 7 of the thin-walled cylindrical component 5, such as Figure 7 As shown, a ring-shaped boss with a width of 15mm is reserved in the middle of the outer circle of the thin-walled cylindrical part 5 during the semi-finishing process.

[0032] In this embodiment, the base 101 is used to clamp onto the three-jaw chuck 4, and the sleeve 102 is used to clamp the thin-walled cylindrical part 5 to be processed, so that the fixing is reliable and the installation and positioning are accurate.

[0033] In this embodiment, the inner diameter of the sleeve 102 matches the outer diameter of the thin-walled cylindrical component 5, and the end face of the sleeve 102 contacts the left side of the outer circular process ring rib 7 provided on the thin-walled cylindrical component 5, which is used to limit the movement of the thin-walled cylindrical component 5. Furthermore, it is easy to install and remove, simple to operate, and provides reliable positioning.

[0034] In this embodiment, the clamping sleeve 2 is provided with a threaded hole 201 and an inward boss 202 inside. The threaded hole 201 is used to connect with the external thread provided on the outside of the sleeve 102. The boss 202 contacts the right side of the outer circular process ring 7 provided on the thin-walled cylindrical part 5, and is used to clamp the outer circular process ring 7 between the sleeve 102 and the boss 202. The threaded hole 201 and the sleeve 102 are connected by threads to improve the fastening effect. Rotating the clamping sleeve 2 can radially clamp the thin-walled cylindrical part 5.

[0035] The clamping sleeve 2 is cylindrical in shape, and the threaded hole 201 is an M150 internal thread with a pitch of 3 and a depth of 45mm.

[0036] In this embodiment, the height of the boss 202 is equal to the wall thickness of the sleeve 102, so that the sleeve 102 and the boss 202 are in contact with the outer surface of the thin-walled cylindrical part 5 on the same horizontal plane, making the clamping reliable and thus further improving the machining accuracy. The inner diameter of the sleeve 102 is Φ125.8(0,+0.1)mm, the depth is 100mm, the external thread is M150, and the pitch is 3.

[0037] In this embodiment, threaded mounting holes 6 for mounting screws 3 are symmetrically provided on the outer circle of the clamping sleeve 2. The thread of the threaded mounting holes 6 is M8.

[0038] In this embodiment, the outer surface of the screw 3 is provided with an external thread that mates with the threaded mounting hole 6. The outer surface of the screw 3 is provided with knurling on the external thread portion. The knurling increases the friction on the surface of the screw 3, making it less likely for the operator to slip or come off when holding the screw 3.

[0039] In this embodiment, the number of screws 3 is not less than 2, which facilitates the operator to operate the clamping sleeve 2 with both hands.

[0040] During clamping, first install the clamping body 1 on the three-jaw chuck 4, and use a dial indicator to align the center runout of the inner hole of the sleeve 102 of the clamping body 1 to no more than 0.02 units, and use a dial indicator to level the end face of the sleeve 102 to an absolute zero runout. If the runout of the end face of the sleeve 102 does not meet the requirements, the end face can be directly finished on the machine tool to ensure the flatness requirements of the end face.

[0041] Then, one end of the thin-walled cylindrical part 5 is inserted into the inner hole of the sleeve 102. At this time, the outer circle of the thin-walled cylindrical part 5 and the inner hole of the sleeve 102 are in a small clearance fit, and the side of the process ring rib 7 on the outer circle of the thin-walled cylindrical part 5 is flush with the end face of the sleeve 102.

[0042] Next, the clamping sleeve 2 is passed through the thin-walled cylindrical part 5. At this time, the outer circle of the thin-walled cylindrical part 5 and the inner hole of the clamping sleeve 2 are also in a small clearance fit. The clamping sleeve 2 is connected to the external thread of the sleeve 102, and the bottom surface of the inner hole of the clamping sleeve 2 is flush with the other side of the process ring rib 7 of the thin-walled cylindrical part 5.

[0043] Finally, two screws 3 are symmetrically installed in the mounting holes 6 on the outer surface of the clamping sleeve 2. The operator manually turns the screws 3 to firmly fix the thin-walled cylindrical part 5 to the turning clamping device of the inner hole of the thin-walled cylindrical part.

[0044] After installation, use a dial indicator to measure the runout of the inner hole of the part. If it is within the allowable range for machining, the inner hole can be machined.

[0045] The machining process for thin-walled cylindrical part 5 consists of roughing, semi-finishing, and finishing. After roughing, artificial aging is added for stress relief. During roughing, a 2mm allowance is reserved for the inner hole, outer circle, and end face. During semi-finishing, a 1mm allowance is reserved for the inner hole, outer circle, and end face. At the same time, a 15mm wide process ring rib 7 is reserved in the middle of the outer circle for clamping when finishing the inner hole. During finishing, the inner hole and end face are finished first, and then the outer circle is finished and the process ring rib 7 is removed.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A clamping structure for turning the inner hole of a thin-walled cylindrical part, characterized in that: It includes a clamping body (1), a clamping sleeve (2) and a screw (3). The clamping body (1) includes a base (101) and a sleeve (102). The clamping sleeve (2) is fitted on the sleeve (102) and the screw (3) is disposed on the clamping sleeve (2).

2. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 1, characterized in that: The base (101) is used to clamp onto the three-jaw chuck (4), and the sleeve (102) is used to clamp the thin-walled cylindrical part (5) to be processed.

3. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 2, characterized in that: The inner diameter of the sleeve (102) matches the outer diameter of the thin-walled cylindrical part (5), and the end face of the sleeve (102) contacts the left side of the outer circular process ring rib (7) provided on the thin-walled cylindrical part (5) to limit the movement of the thin-walled cylindrical part (5).

4. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 1, characterized in that: The clamping sleeve (2) has a threaded hole (201) and an inward boss (202) inside. The threaded hole (201) is used to connect with the external thread provided on the outside of the sleeve (102). The boss (202) contacts the right side of the outer circular process ring rib (7) provided on the thin-walled cylindrical part (5) and is used to clamp the outer circular process ring rib (7) between the sleeve (102) and the boss.

5. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 4, characterized in that: The height of the boss (202) is equal to the wall thickness of the sleeve (102).

6. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 4, characterized in that: The clamping sleeve (2) has symmetrically arranged threaded mounting holes (6) for mounting screws (3) on its outer circle.

7. The thin-walled cylindrical part inner hole turning clamping structure as described in claim 6, characterized in that: The outer surface of the screw (3) is provided with an external thread that mates with the threaded mounting hole (6), and the outer surface of the screw (3) is provided with knurling on the external thread portion.

8. The clamping structure for turning the inner hole of a thin-walled cylindrical part as described in claim 7, characterized in that: The number of screws (3) is not less than 2.

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