Clamping and positioning device for machining steps of 30CrMnSiNi2A high-strength aviation thin-walled workpiece

Abstract

The utility model discloses a clamping and positioning device for machining steps of a 30CrMnSiNi2A high-strength aviation thin-walled workpiece. The clamping and positioning device comprises a clamping boss, a conical positioning body and a fastening nut. The clamping boss and the conical positioning body abut against the two sides of the thin-wall step part respectively. One end of the clamping boss penetrates through the conical positioning body and the thin-wall step part and is matched with the fastening nut, and the conical positioning body is extruded when the clamping boss is matched with the fastening nut. The conical positioning body and the clamping boss are clamped on the two sides of the thin-wall step part respectively, then the fastening nut provides clamping force to limit the freedom degree of the conical positioning body, the clamping boss and the thin-wall step part, clamping and fixing of the thin-wall step part are achieved, direct contact between the thin-wall step part and a machine tool chuck is avoided, and the machining efficiency is improved. And size deformation caused by direct clamping of the thin-wall step part is avoided, and the overall universality is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of thin-wall step parts processing, in particular to a clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-wall parts. Background Art

[0002] 30CrMnSiNi2A alloy structural steel has high strength, good plasticity and toughness, good fatigue resistance and fracture toughness, and low fatigue crack growth rate, so it is often used in aviation equipment. In aviation equipment, there are certain parts with large shaft diameters and wall thicknesses of about 1mm, inner tapers, and outer steps;

[0003] Reference Figure 3 The figure shows a common thin-walled step part, which has a thin-walled side surface 302, a thin-walled left end surface 301, a thin-walled right end surface 303 and an internal tapered hole 304; generally, further processing is required on its outer wall, and the processing requires it to be clamped and fixed on the machine tool chuck. Because the thickness of the part is small, direct clamping is not only difficult to achieve effective clamping, but also easily causes it to deform, which makes clamping difficult and difficult to perform further processing. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts, comprising a clamping boss, a conical positioning body, and a fastening nut; the clamping boss and the conical positioning body are respectively arranged on both sides of the thin-walled step part; one end of the clamping boss passes through the conical positioning body and the thin-walled step part and cooperates with the fastening nut, and the clamping boss squeezes the conical positioning body when cooperating with the fastening nut. Since the conical positioning body and the clamping boss are respectively clamped on both sides of the thin-walled step part, and the clamping force is provided by the fastening nut, the thin-walled step part can be better clamped on the machine tool chuck, and direct contact between the thin-walled step part and the machine tool chuck is avoided, the clamping force during mechanical clamping and the dimensional deformation caused by residual stress during processing are reduced, and the overall versatility is higher.

[0007] The utility model has the following beneficial effects:

[0008] 1. The conical positioning body and the clamping boss of the utility model are respectively clamped on both sides of the thin-walled step part, and the clamping force is provided by the fastening nut to limit the freedom of the conical positioning body, the clamping boss and the thin-walled step part, so as to realize the clamping and fixing of the thin-walled step part, avoid direct contact between the thin-walled step part and the machine tool chuck, avoid dimensional deformation caused by direct clamping of the thin-walled step part, and have higher overall versatility;

[0009] 2. The utility model is also provided with an open tire so that the chuck clamping positioning step and the machine tool chuck can be quickly clamped and positioned, which can avoid direct contact between the clamping boss and the machine tool chuck, reduce deformation caused by residual stress during clamping and processing, and have higher overall versatility.

[0010] 3. In the utility model, the conical positioning body and the clamping boss are in surface contact with the thin-walled step part, which can disperse the extrusion stress of clamping and avoid deformation of the thin-walled step part caused by excessive local pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 An exploded view of the overall assembly of the utility model;

[0012] Figure 2 The overall assembly diagram of the utility model;

[0013] Figure 3 Schematic diagram of a thin-walled step member of the utility model;

[0014] Figure 4 Schematic diagram of the conical positioning body of the utility model;

[0015] Figure 5 Schematic diagram of the clamping boss of the utility model;

[0016] Figure 6 Schematic diagram of the fastening nut of the utility model;

[0017] Figure 7 A schematic diagram of a clincher tire of the present invention.

[0018] Legend: 10, open tire; 101, chuck positioning step; 102, clamping through hole; 103, square opening slot;

[0019] 20, clamping boss; 201, cylindrical boss; 202, positioning polished rod; 203, threaded rod;

[0020] 30, thin-walled step part; 301, thin-walled left end surface; 302, thin-walled side surface; 303, thin-walled right end surface; 304, tapered hole;

[0021] 40, conical positioning body; 401, cylindrical through hole; 402, positioning step; 403, conical positioning surface;

[0022] 50. Fastening nut; 501. Threaded hole. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Reference Figures 1 to 7 The utility model provides a clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts, including a clamping boss 20, a conical positioning body 40, and a fastening nut 50. The clamping boss 20 and the conical positioning body 40 are respectively arranged on both sides of the thin-walled step part 30; one end of the clamping boss 20 passes through the conical positioning body 40 and the thin-walled step part 30 and cooperates with the fastening nut 50. When the clamping boss 20 cooperates with the fastening nut 50, the conical positioning body 40 is squeezed. One end of the clamping boss 20 is connected to the machine tool chuck, and the other end completes the clamping and fixing of the thin-walled step part 30 through the conical positioning body 40 and the fastening nut 50.

[0025] The clamping boss 20 includes a cylindrical boss 201 and a positioning rod 202 which are fixedly connected to each other. A fastening threaded rod 203 is arranged on the side of the positioning rod 202 away from the cylindrical boss 201. A threaded hole 501 for matching the threaded rod 203 is arranged on the fastening nut 50. After the positioning rod 202 passes through the thin-walled step part 30 and the conical positioning body 40, the threaded rod 203 thereon extends to the outside of the conical positioning body 40 and matches with the thread of the fastening nut 50 to realize the clamping and fixation of the thin-walled step part 30.

[0026] The conical positioning body 40 includes a conical positioning surface 403, a positioning step 402 and a cylindrical through hole 401. The conical positioning surface 403 is used to clearance fit the inner wall of the thin-walled step part 30 (i.e., the tapered hole 304) to provide support for the inner wall of the thin-walled step part 30. The diameter of the positioning step 402 is larger than the maximum diameter of the conical positioning surface 403 to ensure that it can provide good support for the entire end face. The cylindrical through hole 401 is clearance fit with the positioning light rod 202.

[0027] The edges of both ends of the cylindrical through hole 401 are sharp-edged and rounded to prevent workers from being scratched by touching them.

[0028] The end surface of the cylindrical boss 201 connected to the positioning polished rod 202 is a plane, which is used to ensure that it is connected to the thin-walled left end surface 301 of the thin-walled step part 30 in surface contact. The end surface of the positioning step 402 connected to the conical positioning surface 403 is a plane, which is used to ensure that it is connected to the thin-walled right end surface 303 of the thin-walled step part 30 in surface contact. Surface contact can disperse the extrusion stress of clamping and avoid deformation of the thin-walled step part 30 caused by excessive local pressure.

[0029] The clamping and positioning device of the utility model also includes an open tire 10 for connecting the clamping boss 20 and the machine tool chuck. The open tire 10 and the clamping boss 20 are transitionally matched. The open tire 10 is directly clamped on the machine tool chuck, and the open tire 10 is connected to the clamping boss 20. The open tire 10 includes a chuck positioning step 101 and an opening groove. The opening groove is arranged at the axial position of the open tire 10. A clamping through hole matching the clamping boss 20 is opened in the middle of the open tire 10. The chuck positioning step 101 is arranged against the end face of the machine tool chuck. The above-mentioned opening groove is arranged so that the clamping force of the machine tool chuck is indirectly transmitted to the clamping boss 20, reducing the size deformation of the clamping boss 20 caused by the stress release caused by the clamping force, and also making the thin-walled step part 30 more uniformly stressed, further reducing the deformation of the thin-walled step part 30 caused by the stress release caused by the clamping force.

[0030] The opening slot is set as a square opening slot 103. The square slot is easy to open and has high economic efficiency.

[0031] To sum up: the clamping and positioning device of the utility model first matches the thin-walled step part 30 on the conical positioning body 40 to complete the clamping and positioning of the thin-walled right end face 303 of the thin-walled step part 30, and then the clamping boss 20 and the conical positioning body 40 are clearance-matched, so that the thin-walled left end face 301 of the thin-walled step part 30 to be processed is contacted and fixed with the clamping boss 20. In order to limit the freedom of the three to cooperate, the clamping boss 20, the thin-walled step part 30 to be processed and the conical positioning body 40 are axially clamped and positioned with the fastening nut 50. After the overall assembly and fixation, the assembled parts are placed horizontally in the open tire 10 to achieve overall cooperation with the machine tool chuck. Through the clamping and positioning device of the utility model, the tapered hole thin-walled step parts can be clamped and fixed during processing. It is easy and quick to operate, effectively avoids direct contact between the thin-walled parts and the clamping machinery, reduces the clamping force during mechanical clamping and the dimensional deformation caused by residual stress during processing, and has higher overall versatility.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts, characterized in that: It comprises a clamping boss (20), a conical positioning body (40), and a fastening nut (50); The clamping boss (20) and the conical positioning body (40) are respectively disposed on both sides of the thin-walled step part (30); one end of the clamping boss (20) passes through the conical positioning body (40) and the thin-walled step part (30) and cooperates with the fastening nut (50); the clamping boss (20) squeezes the conical positioning body (40) when cooperating with the fastening nut (50).

2. A clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 1, characterized in that: The clamping boss (20) comprises a cylindrical boss (201) and a positioning polished rod (202) which are fixedly connected to each other, a fastening threaded rod (203) is arranged on a side of the positioning polished rod (202) away from the cylindrical boss (201), and a threaded hole (501) for matching the threaded rod (203) is arranged on the fastening nut (50).

3. A clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 2, characterized in that: The conical positioning body (40) comprises a conical positioning surface (403), a positioning step (402) and a cylindrical through hole (401); the conical positioning surface (403) is used to clearance fit the inner wall of the thin-walled step part (30); the diameter of the positioning step (402) is larger than the maximum diameter of the conical positioning surface (403); and the cylindrical through hole (401) is clearance fit with the positioning polished rod (202).

4. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 3 is characterized in that: The edges at both ends of the cylindrical through hole (401) are subjected to sharp edge rounding.

5. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 3 is characterized in that: The end surface of the cylindrical boss (201) connected to the positioning polished rod (202) is a plane, which is used to ensure that the connection between the cylindrical boss (201) and the thin-walled step member (30) is in surface contact.

6. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 3 is characterized in that: The end surface of the positioning step (402) connected to the conical positioning surface (403) is a plane, which is used to ensure that the connection between the positioning step (402) and the thin-walled step member (30) is in surface contact.

7. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 6 is characterized in that: It also includes an open tire (10) for connecting the clamping boss (20) and the machine tool chuck, and the open tire (10) and the clamping boss (20) are transitionally matched.

8. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 7 is characterized in that: The open tire (10) comprises a chuck positioning step (101) and an opening groove, wherein the opening groove is arranged at an axial position of the open tire (10), and a clamping through hole cooperating with a clamping boss (20) is provided in the middle of the open tire (10).

9. The clamping and positioning device for step processing of 30CrMnSiNi2A high-strength aviation thin-walled parts according to claim 8, characterized in that: The opening slot is configured as a square opening slot (103).

Images