Tail end positioning tool of numerical control lathe

Abstract

A numerical control lathe tail end positioning tool relates to the technical field of pipe machining equipment design and comprises a mounting sleeve and a transmission shaft arranged in the mounting sleeve and coaxial with the mounting sleeve. The rear end of the mounting sleeve is spirally connected with the transmission shaft, and the front end can be coaxially connected with the tail end of a main shaft of a machine tool; the front end of the transmission shaft can penetrate through the main shaft and is provided with a positioning piece capable of positioning a workpiece; the front end of the positioning piece is of a conical or frustum-shaped structure and is arranged to be capable of being partially inserted into the to-be-jacked end of the pipe. According to the positioning tool, through the detailed structural design of the conical or frustum-shaped front end of the positioning piece, the pipe can be stably arranged at the front end of the positioning piece in a sleeving mode, the positioning tool can be suitable for the pipe with the large inner diameter, sliding is not likely to be generated between the pipe and the positioning piece in the machining process, and due to the conical or frustum-shaped structure, the machining efficiency is improved. Compared with a cylinder structure in the prior art, the weight is greatly reduced, and then the risk of bending deformation of the transmission shaft is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe processing equipment design, in particular to a tail end positioning tool for a numerically controlled lathe. Background Art

[0002] When CNC lathes are used to batch process slender pipe workpieces, the use of positioning fixtures is an effective solution to improve processing efficiency. This fixture fixes the length of the pipe inserted into the spindle hole to ensure that the length of the pipe extended from the chuck is consistent each time it is installed, thereby eliminating the need to repeatedly measure the length of the pipe and significantly improving production efficiency. However, some existing positioning fixture designs are not suitable for pipes with a large range of inner diameter variations.

[0003] For example, the application number CN201821465791.5 is a tool for positioning in the spindle hole of a lathe. The positioning piece of the tool adopts a cylindrical solid structure. This design has obvious limitations when facing pipes with changing inner diameters. Specifically, as the inner diameter of the pipe increases, a positioning piece with a larger diameter is required. Since the positioning piece is a solid cylindrical structure, its weight also increases, which not only affects the stability of the transmission shaft, but also increases the risk of bending and deformation of the positioning shaft. In addition, when positioning the pipe, the positioning piece of this solid structure mainly relies on its end face to limit the position of the pipe. For pipes with larger inner diameters, relative sliding is likely to occur between the end face of the pipe and the end face of the positioning piece during processing, which will directly affect the processing accuracy of the pipe. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a tail end positioning tool for a CNC lathe.

[0005] The technical solution of this utility model is as follows:

[0006] A tail end positioning tool for a numerically controlled lathe mainly comprises a mounting sleeve and a transmission shaft, wherein the transmission shaft is arranged inside the mounting sleeve and is coaxial with the mounting sleeve.

[0007] The rear end of the mounting sleeve is spirally connected to the transmission shaft, the front end of the mounting sleeve is configured to be coaxially connected to the tail end of the main shaft of the machine tool, the front end of the transmission shaft is configured to be able to pass through the main shaft, and is provided with a positioning piece that can position the pipe, the front end of the positioning piece is a conical or frustum-shaped structure, and is configured to be partially inserted into the interior of the end of the pipe to be tightened, by rotating the tail end of the transmission shaft, the transmission shaft is controlled to perform telescopic movement along the axis of the mounting sleeve, thereby realizing adjustment of the length of the pipe inserted into the main shaft of the machine tool.

[0008] Compared with the prior art, this positioning tool (a positioning tool for the tail end of a CNC lathe) has a detailed structural design of a cone or frustum at the front end of the positioning piece, so that the pipe can be firmly mounted on the front end of the positioning piece. Even pipes with larger inner diameters can be used. During the processing, it is not easy for the pipe and the positioning piece to slip. In addition, the conical or frustum-shaped structure greatly reduces the weight compared with the cylindrical structure in the prior art, thereby reducing the risk of bending and deformation of the drive shaft.

[0009] As a further implementation:

[0010] The mounting sleeve comprises a first connecting tube and a second connecting tube which are coaxial and arranged front and back, the transmission shaft is spirally arranged inside the second connecting tube, the front end of the first connecting tube is arranged to be able to be sleeved on the tail end of the main shaft and the outer ring is provided with a first tightening bolt, and the detachable connection design between the first connecting tube and the main shaft makes the disassembly and assembly of the device and the main shaft convenient and easy to maintain.

[0011] In order to enhance the connection strength between the mounting sleeve and the main shaft, the outer diameter of the second connecting tube is set to be smaller than the inner diameter of the first connecting tube, and the front end outer ring is connected to the rear end of the first connecting tube through an adapter plate. A second tightening bolt is provided on the adapter plate. The inner end of the second tightening bolt extends into the first connecting tube and can tighten the tail end of the main shaft.

[0012] In order to further enhance the connection strength between the mounting sleeve and the main shaft, at least two first tightening bolts and at least two second tightening bolts are provided.

[0013] Preferably, the positioning member is spirally connected to the transmission shaft to facilitate disassembly and maintenance.

[0014] In order to prevent relative rotation between the transmission shaft and the second connecting cylinder, the rear end of the transmission shaft is extended out of the rear end of the second connecting cylinder, and a locking nut is provided to prevent rotation, thereby improving the stability of the device during operation.

[0015] The first connecting tube and the second connecting tube are both welded to the adapter plate.

[0016] As a further implementation method: the interior of the locating piece is designed to be a hollow structure to further reduce the weight of the locating piece, thereby further reducing the risk of bending and deformation of the drive shaft. At the same time, the surface of the front end of the locating piece in contact with the pipe has a certain hardness, which improves the wear resistance of the locating piece and increases its service life.

[0017] The beneficial effect of the tail end positioning tooling of a CNC lathe of the utility model is that, through the detailed structural design of the conical or frustum-shaped front end of the positioning piece, the pipe can be firmly sleeved on the front end of the positioning piece, and even the pipe with a larger inner diameter can be applied, and at the same time, it is not easy to slip between the pipe and the positioning piece during the processing. The conical or frustum-shaped structure greatly reduces the weight and reduces the risk of bending and deformation of the transmission shaft compared to the cylindrical structure in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the attached picture:

[0019] Figure 1 This is a schematic diagram of the use of a tail end positioning tool for a CNC lathe according to the utility model;

[0020] Figure 2 This is a structural schematic diagram (half-section view) of a tail end positioning tool for a CNC lathe of the utility model;

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of the installation sleeve;

[0022] The components represented by the reference numerals in the figure are:

[0023] 1. Main shaft; 2. Pipe; 3. Positioning tool; 31. Mounting sleeve; 32. Transmission shaft; 33. Positioning piece; 311. Second connecting tube; 312. Adapter plate; 313. First connecting tube; 34. Second tightening bolt. DETAILED DESCRIPTION

[0024] This embodiment provides a CNC lathe tail end positioning tool, such as Figure 1 and Figure 2 As shown, the positioning tool 3 is arranged at the tail end of the CNC lathe spindle 1 and is used to adjust the length of the pipe 2 inserted into the machine tool spindle 1 when processing the pipe 2. It includes a mounting sleeve 31, a transmission shaft 32 and a positioning piece 33.

[0025] Combination Figure 1 The transmission shaft 32 is arranged inside the mounting sleeve 31 and is coaxial with the mounting sleeve 31. The rear end of the mounting sleeve 31 is spirally connected to the transmission shaft 32. The front end of the mounting sleeve 31 is coaxially connected to the tail end of the spindle 1 of the machine tool. The front end of the transmission shaft 32 passes through the spindle 1 and is spirally connected to the front end of the positioning member 33 for easy disassembly and maintenance.

[0026] The core invention of the present utility model is that the front end of the positioning member 33 is a conical or frustum-shaped structure, and is configured to be partially inserted into the interior of the end of the pipe 2 to be tightened. By rotating the rear end of the transmission shaft 32, the transmission shaft 32 can be controlled to perform telescopic movement along the axis of the mounting sleeve 31, thereby realizing adjustment of the length of the pipe 2 inserted into the machine tool spindle 1.

[0027] The conical or frustum-shaped detailed structural design of the front end of the positioning member 33 allows the tube 2 to be securely mounted on the front end of the positioning member 33, and is suitable even for tubes 2 with larger inner diameters. During processing, it is not easy for the tube 2 and the positioning member 33 to slip. In addition, the conical or frustum-shaped structure greatly reduces the weight compared to the cylindrical structure in the prior art, thereby reducing the risk of bending and deformation of the transmission shaft 32.

[0028] In this embodiment, the front end of the positioning member 33 is preferably a frustum-shaped structure, and the interior of the positioning member 33 is designed as a hollow structure to further reduce the weight of the positioning member 33, thereby further reducing the risk of bending and deformation of the transmission shaft 32. At the same time, the surface of the front end of the positioning member 33 in contact with the pipe 2 has a certain hardness, which improves the wear resistance of the positioning member 33 to enhance its service life. In addition, the edge of the positioning member 33 is provided with a chamfered structure to prevent scratches on the operator during disassembly and assembly, and to prevent scratches on the pipe 2 when positioning the pipe 2, so as to facilitate the pipe 2 to be put on the front end of the positioning member 33.

[0029] Combination Figure 3 Specifically, the structure of the mounting sleeve 31 includes a first connecting tube 313 and a second connecting tube 311 which are coaxial and arranged front and back, and an adapter plate 312 arranged between the first connecting tube 313 and the second connecting tube 311, wherein the first connecting tube 313 and the second connecting tube 311 are both welded to the adapter plate 312.

[0030] Specifically, how the mounting sleeve 31 is connected to the transmission shaft 32 and the main shaft 1 is as follows:

[0031] The rear end of the transmission shaft 32 is spirally arranged inside the second connecting cylinder 311 and extends out of the rear end of the second connecting cylinder 311. A locking nut is also provided to prevent relative rotation between the transmission shaft 32 and the second connecting cylinder 311, thereby improving the overall stability of the positioning tooling 3 during operation.

[0032] The front end of the first connecting tube 313 is sleeved on the rear end of the main shaft 1 and a first tightening bolt is provided on the outer ring. The detachable connection design between the first connecting tube 313 and the main shaft 1 makes the disassembly and assembly with the main shaft 1 more convenient and easy to maintain.

[0033] The outer diameter of the second connecting tube 311 is set to be smaller than the inner diameter of the first connecting tube 313, and the front end outer ring is connected to the rear end of the first connecting tube 313 through the adapter plate 312, and the adapter plate 312 is provided with a second tightening bolt 34, and the inner end of the second tightening bolt 34 extends into the first connecting tube 313 and presses against the tail end face of the main shaft 1. Through the provision of the second tightening bolt 34, the connection strength between the mounting sleeve 31 and the main shaft 1 is enhanced, and at least two of the first tightening bolt and the second tightening bolt 34 are provided, which further enhances the connection strength between the mounting sleeve 31 and the main shaft 1.

[0034] The utility model discloses a tail end positioning tool for a CNC lathe. By designing the detailed structure of the conical or frustum-shaped front end of the positioning piece 33, the pipe 2 can be firmly sleeved on the front end of the positioning piece 33. Even the pipe 2 with a larger inner diameter can be applied. At the same time, it is not easy for the pipe 2 and the positioning piece 33 to slide during the processing. The conical or frustum-shaped structure reduces the weight compared with the cylindrical structure in the prior art, thereby effectively reducing the risk of bending and deformation of the transmission shaft 32.

Claims

1. A CNC lathe tail end positioning tool, characterized in that: It comprises a mounting sleeve (31) and a transmission shaft (32) arranged inside the mounting sleeve and coaxially arranged therewith; The rear end of the mounting sleeve (31) is screw-connected to the transmission shaft (32), and the front end is configured to be coaxially connected to the rear end of the main shaft (1) of the machine tool; The front end of the transmission shaft (32) is configured to be able to pass through the main shaft (1), and is provided with a positioning member (33) capable of positioning a workpiece; The front end of the positioning member (33) is a conical or frustum-shaped structure, and is configured to be partially inserted into the interior of the end of the pipe (2) to be tightened.

2. A CNC lathe tail end positioning tool as claimed in claim 1, characterized in that: The mounting sleeve (31) comprises a first connecting tube (313) and a second connecting tube (311) which are coaxially arranged in front and behind each other; The transmission shaft (32) is spirally arranged inside the second connecting cylinder (311); The front end of the first connecting tube (313) is configured to be sleeved on the rear end of the main shaft (1), and the outer ring is provided with a first tightening bolt.

3. A CNC lathe tail end positioning tool as claimed in claim 2, characterized in that: The outer diameter of the second connecting tube (311) is smaller than the inner diameter of the first connecting tube (313), and the front outer ring is connected to the rear end of the first connecting tube (313) through the adapter plate (312); The adapter plate (312) is provided with a second tightening bolt (34), the inner end of which extends into the first connecting tube (313) and is capable of tightening against the rear end of the main shaft (1).

4. A CNC lathe tail end positioning tool as claimed in claim 3, characterized in that: At least two of the first tightening bolts and the second tightening bolts (34) are provided.

5. The tail end positioning tool for a CNC lathe according to claim 1, characterized in that: The positioning member (33) is screw-connected to the transmission shaft (32).

6. A CNC lathe tail end positioning tool as claimed in claim 2, characterized in that: The rear end of the transmission shaft (32) extends out of the rear end of the second connecting cylinder (311) and is provided with a locking nut.

7. A CNC lathe tail end positioning tool as described in any one of claims 1 to 6, characterized in that: The interior of the positioning member (33) is a hollow structure.

8. A CNC lathe tail end positioning tool as claimed in claim 3, characterized in that: The first connecting tube (313) and the second connecting tube (311) are both connected to the adapter plate (312) by welding.

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