Turning tool for slender thin-wall tubular part

Abstract

The utility model discloses a turning tool for slender thin-walled tubular parts, which is used for turning the slender thin-walled tubular parts by a numerical control lathe and comprises an expansion mandrel, a base and the parts. The outer diameter and the length of the expansion mandrel can be changed according to the size of a machined part; gaps are formed in the two ends of the mandrel in a crossed cutting mode, so that the mandrel expands the blank outwards conveniently; a hexagonal boss is arranged at one end of the mandrel, torque can be conveniently applied, and a groove is machined in the hexagonal boss and used in cooperation with a lathe tail tip. A cylindrical boss is arranged at one end of the base and used for being clamped on a lathe. The other end of the base is a conical boss, and the tail section of the boss is a threaded column used for being connected with the mandrel. In the threaded connection process of the base and the core shaft, the conical boss of the base expands the core shaft, and then the core shaft expands the blank piece tightly. The device is simple in structure and convenient to mount and dismount, the coaxiality of machined parts can be guaranteed, the problem that thin and long ultrathin-wall parts are difficult to machine is solved, the percent of pass of the parts is increased, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a turning tool for slender thin-walled tubular parts, belonging to the field of mechanical process equipment. Background Technique

[0002] Thin-walled tubular parts refer to tubular parts with an outer diameter to wall thickness ratio greater than 20. Such parts are generally large-sized pipe parts made by cold drawing and are all purchased externally when in use. However, some buffer sleeve parts also have an outer diameter to wall thickness ratio greater than 20 and belong to small-batch self-made parts that cannot be purchased externally. Their wall thickness less than 0.5 mm and length greater than 100 mm pose great difficulties in the processing of such parts.

[0003] In the prior art, the conventional processing methods mainly have the following problems:

[0004] When using ordinary processing methods without using a tooling, whether turning the inner diameter first or the outer diameter first, the parts cannot be processed into shape.

[0005] When using an ordinary mandrel as a tooling and with a clearance fit between the mandrel and the part, the processed parts will be deformed and cannot meet the coaxiality requirements.

[0006] When using an ordinary mandrel as a tooling and with a transition or interference fit between the mandrel and the part, the parts are easy to be processed into shape, but the parts are not easy to disassemble when the tooling is disassembled and are extremely easy to be deformed.

[0007] In summary, using the prior art, qualified parts cannot be processed. Content of the Utility Model

[0008] The technical problem to be solved by the utility model is: According to the needs of actual production work, the utility model provides a turning tool for slender thin-walled tubular parts, which has a simple structure, is easy to operate, and is safe and reliable.

[0009] The technical solution of the utility model is:

[0010] The present invention discloses a turning tool for slender thin-walled tubular parts, including: a swelling mandrel, a base, and the parts to be processed; wherein, the swelling mandrel is sleeved inside the parts to be processed, one end of the swelling mandrel is a hexagonal boss, and a groove is arranged inside the hexagonal boss for cooperating with the tailstock center of the lathe; the other end is coaxially connected with the base.

[0011] Further, in the above tooling, the outer diameter and length of the swelling mandrel can be changed according to the size of the parts to be processed, and the outer diameter is 0.1 - 0.2 mm smaller than the inner diameter of the parts to be processed to ensure a clearance fit.

[0012] Furthermore, in the above tooling, a cross gap of 0.1 to 0.2 mm is provided at both ends of the expansion mandrel to facilitate the expansion mandrel to expand the processed parts outward.

[0013] Furthermore, in the above-mentioned tooling, the lathe center presses against one end of the expansion mandrel to expand the expansion mandrel.

[0014] Furthermore, in the above-mentioned tooling, a tapered hole is provided inside the other end of the expansion core shaft, and a threaded hole is provided at the small end of the tapered hole for connecting to the base.

[0015] Furthermore, in the above tooling, one end of the base is a conical boss, the height of the conical boss is smaller than the height of the tapered hole of the expansion core shaft, and the tail section of the conical boss is a threaded column for connecting to the expansion core shaft.

[0016] Furthermore, in the above-mentioned tooling, the other end of the base is a cylindrical boss with a height of 30mm-50mm, which is used for clamping on a CNC lathe.

[0017] Furthermore, in the above-mentioned tooling, during the process of threaded connection between the base and the expansion mandrel, the conical boss of the base will expand the expansion mandrel, thereby causing the expansion mandrel to expand the processed part.

[0018] Furthermore, in the above-mentioned tooling, the expansion mandrel and the processed part are clearance-fitted, and the expansion mandrel and the base are connected by threads.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] (1) The utility model can process parts of different specifications by changing the outer diameter and length of the core shaft, and has strong interchangeability.

[0021] (2) The present invention ensures that the core shaft can be expanded during the installation process by cutting the gap through the core shaft, thereby tightening the parts and further ensuring the accuracy of the parts during processing.

[0022] (3) The utility model ensures the rigidity of the core shaft by cross-cutting gaps at both ends of the core shaft.

[0023] (4) The central shaft and the base of the utility model are connected by threads, which has reliable connection, stable structure and high safety.

[0024] (5) The design of the hexagonal boss at one end of the core shaft of the utility model facilitates the application of torque during the connection between the core shaft and the base, preventing the threaded connection from loosening due to the high-speed rotation of the parts during the processing.

[0025] (6) The design of the conical structure in the present invention plays a key role and also plays a role in regulating the degree of expansion of the core shaft.

[0026] (7) The design of the present utility model is applicable to CNC lathes, with a simple structure, convenient operation, and improved production efficiency.

[0027] (8) The overall structure of the present utility model is simple and reliable, facilitating disassembly, assembly, and transportation, with high applicability and strong operability.

[0028] (9) The present utility model provides a turning tooling for slender thin-walled tubular parts. The outer diameter and length of the mandrel in the tooling are designed according to the inner diameter and length of the parts in actual production, ensuring that the mandrel can expand and tighten the parts during installation and there is a gap between the mandrel and the parts during disassembly. This can not only ensure the dimensional and tolerance requirements during the machining process of the parts but also ensure that the parts do not deform during disassembly. The utility model has a simple structure, is easy to operate, and is safe and reliable. Description of the Drawings

[0029] Figure 1 is the front view of the present utility model;

[0030] Figure 2 is the internal structure cross-sectional view of the present utility model;

[0031] Wherein: 1 Expanding mandrel; 2 Base; 3 Machined part. Detailed Embodiment

[0032] The present utility model will be further described below in conjunction with the description of the drawings and specific embodiments:

[0033] The present invention discloses a turning tooling for slender thin-walled tubular parts, including: an expanding mandrel 1, a base 2, and a machined part 3; wherein, the expanding mandrel 1 is sleeved inside the machined part 3, one end of the expanding mandrel 1 is a hexagonal boss, and there is a groove inside the hexagonal boss for cooperation with the tailstock center of the lathe; the other end is coaxially connected to the base 2.

[0034] Preferably, the outer diameter and length of the expanding mandrel 1 can be changed according to the size of the machined part 3, and the outer diameter is 0.1 - 0.2 mm smaller than the inner diameter of the machined part 3 to ensure clearance fit.

[0035] Preferably, 0.1 - 0.2 mm of cross slots are provided at both ends of the expanding mandrel 1 to facilitate the expanding mandrel 1 to expand and tighten the machined part 3 outward.

[0036] Preferably, the lathe center bears against one end of the expanding mandrel 1 to expand the expanding mandrel 1.

[0037] Preferably, there is a tapered hole inside the other end of the expanding mandrel 1, and a threaded hole is provided at the small end of the tapered hole for connecting the base 2.

[0038] Preferably, one end of the base 2 is a conical boss, the height of the conical boss is less than the height of the tapered hole of the expansion mandrel 1, and the tail section of the conical boss is a threaded post for connecting the expansion mandrel 1.

[0039] Preferably, the other end of the base 2 is a cylindrical boss, and the height of the boss is 30 mm - 50 mm for clamping on a CNC lathe.

[0040] Preferably, during the process of threadedly connecting the base 2 and the expansion mandrel 1, the conical boss of the base 2 will expand the expansion mandrel 1, thereby expanding and clamping the machined part 3 by the expansion mandrel 1.

[0041] Preferably, the expansion mandrel 1 and the machined part 3 are in clearance fit, and the expansion mandrel 1 and the base 2 are connected by threads. The structure is simple, the disassembly and assembly are convenient, and the coaxiality of the machined part is ensured.

[0042] Embodiment

[0043] This embodiment discloses a turning tooling for slender thin-walled tubular parts, including an expansion mandrel, a base, and the machined part. The outer diameter and length of the expansion mandrel can be changed according to the size of the machined part; slits are cross-cut at both ends of the mandrel to facilitate the outward expansion of the mandrel for clamping the blank; a groove is machined at one end of the mandrel for use in conjunction with the tailstock center of the lathe; there is a tapered hole inside the other end of the mandrel, and a threaded hole is machined at the small end of the tapered hole for connecting the base; one end of the base is a cylindrical boss for clamping on the lathe.

[0044] In the above-mentioned turning tooling for slender thin-walled tubular parts, slits of 0.1 mm are cross-cut at both ends of the expansion mandrel;

[0045] A hexagonal boss is machined at one end of the expansion mandrel, the height of the boss is 5 mm, and there is a groove with a diameter of 5 mm and a depth of 5 mm inside the hexagonal boss for use in conjunction with the tailstock center of the lathe;

[0046] There is a tapered hole inside the other end of the expansion mandrel, a M5 threaded hole is machined at the small end of the tapered hole, the threaded depth is 12 mm, the taper of the tapered hole is the same as that of the conical boss of the base, and the height is 0.5 mm higher than that of the conical boss of the base;

[0047] One end of the base is a conical boss, the height of the conical boss is 30 mm, the large end diameter is 10 mm, the small end diameter is 5 mm, and there is a threaded post with M5 and a threaded length of 10 mm at the tail section of the boss;

[0048] The other end of the base is a cylindrical boss, and the height of the boss is 30 mm - 50 mm;

[0049] The materials of a turning tooling for slender thin-walled tubular parts are all made of stainless steel.

[0050] The working principle of the present utility model is:

[0051] Slip the machined part 3 onto the expansion mandrel 1. Then, use a wrench to apply torque at the hexagonal boss of the mandrel 1 to ensure reliable threaded connection between the mandrel 1 and the base 2. During this process, the mandrel 1 will be expanded to further tighten the part 3. Then, clamp the boss of the base 2 on the three-jaw chuck of the CNC lathe, and the center at the tail of the lathe presses against the groove of the mandrel 1. This process will expand the other end of the mandrel 1 again to tighten the mandrel, and then the machining of the part 3 can begin.

[0052] The content not described in detail in the specification of this utility model is well-known technology to those skilled in the art.

Claims

1. A turning tooling for slender thin-walled tubular parts, characterized in that, Comprising: A clamping mandrel (1), a base (2) and a part to be machined (3); wherein, the clamping mandrel (1) is sleeved inside the part to be machined (3), one end of the clamping mandrel (1) is a hexagonal boss, and a groove is provided inside the hexagonal boss for use in cooperation with the tailstock center of the lathe; the other end is coaxially connected to the base (2).

2. The turning tooling for an elongated thin-walled tubular part according to claim 1, wherein: The outer diameter and length of the clamping mandrel (1) can be changed according to the size of the part to be machined (3), and the outer diameter is 0.1 - 0.2 mm smaller than the inner diameter of the part to be machined (3) to ensure clearance fit.

3. The turning tooling for an elongated thin-walled tubular part according to claim 1, characterized in that: Cross slits of 0.1 - 0.2 mm are provided at both ends of the clamping mandrel (1) to facilitate the outward expansion of the clamping mandrel (1) to expand the part to be machined (3).

4. The turning tooling for an elongated thin-walled tubular part according to claim 1, characterized in that: The lathe center bears against one end of the clamping mandrel (1) to expand the clamping mandrel (1).

5. The turning tooling for an elongated thin-walled tubular part according to claim 4, characterized in that: A tapered hole is provided inside the other end of the clamping mandrel (1), and a threaded hole is provided at the small end of the tapered hole for connecting the base (2).

6. The turning tooling for an elongated thin-walled tubular part according to claim 1, characterized in that: One end of the base (2) is a tapered boss, the height of the tapered boss is less than the height of the tapered hole of the clamping mandrel (1), and the tail section of the tapered boss is a threaded post for connecting the clamping mandrel (1).

7. The turning tooling for an elongated thin-walled tubular part according to claim 6, characterized in that: The other end of the base (2) is a cylindrical boss, and the height of the boss is 30 mm - 50 mm for clamping on the CNC lathe.

8. The turning tooling for an elongated thin-walled tubular part according to claim 7, characterized in that: During the process of the threaded connection between the base (2) and the clamping mandrel (1), the tapered boss of the base (2) will expand the clamping mandrel (1), thereby expanding the clamping mandrel (1) to expand the part to be machined (3).

9. The turning tooling for an elongated thin-walled tubular part according to claim 1, characterized in that: The clamping mandrel (1) and the part to be machined (3) are in clearance fit, and the clamping mandrel (1) and the base (2) are connected by threads.

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