Positioning tool and numerical control lathe applying same

Abstract

A positioning tool and a numerical control lathe applying the same relate to the technical field of lathe spindle hole inner positioning, and comprise a mounting cylinder and a moving shaft which is arranged in the mounting cylinder and can coaxially stretch out and draw back with the mounting cylinder; the front end of the mounting cylinder can be coaxially connected with the tail end of the machine tool spindle, and the tail end of the mounting cylinder is spirally connected with the tail end of the moving shaft or an elastic piece capable of fixing / loosening the moving shaft is arranged between the tail end of the mounting cylinder and the moving shaft; the moving shaft can penetrate through the main shaft, a positioning disc capable of positioning a workpiece is arranged at the front end of the moving shaft, and the outer diameter of the positioning disc is smaller than the inner diameter of the mounting cylinder. According to the positioning tool, the outer diameter of the positioning disc is set to be smaller than the inner diameter of the mounting cylinder, so that bidirectional movement of the positioning disc in the main shaft and the mounting cylinder is achieved, the moving stroke of the positioning disc is expanded, the positioning tool can be used for a workpiece with the length larger than that of the main shaft, and the length of the mounting cylinder can be adjusted according to actual requirements; and the workpiece positioning flexibility is greatly improved, and the application range of the positioning tool is greatly widened.

Description

Technical Field

[0001] The utility model relates to the technical field of in-positioning in the spindle hole of a lathe, and particularly relates to a positioning tooling and a numerical control lathe applying the same. Background Technique

[0002] During the process of machining slender shaft workpieces on a numerical control lathe, since it is necessary to confirm the exact length of the workpiece inserted into the spindle hole, it is usually necessary to measure each workpiece individually, which will significantly reduce the efficiency of batch production. To improve the machining efficiency, a solution is to install a positioning tooling on the spindle at the tail end of the lathe. This tooling eliminates the need for repeated measurement by fixing the length of the slender shaft inserted into the spindle hole and improves the production efficiency. However, the range of workpiece lengths that these toolings can adapt to is still limited.

[0003] Taking a tooling for in-positioning in the spindle hole of a lathe with the application number CN201821465791.5 as an example, this tooling is installed on the lathe spindle and uses a moving shaft and a retaining disc to fix the position of the slender shaft in the spindle hole to ensure that the insertion depth of the workpiece is consistent. This enables the measurement step to be omitted during batch production of slender shafts, thereby increasing the machining speed. However, since the moving disc is spirally connected to the inner ring of the gland, and the gland is arranged at one end of the lathe spindle far from the chuck, the retaining disc cannot pass through the gland, resulting in the moving shaft being able to only move back and forth in the spindle hole. Furthermore, the adjustable range of the workpiece is limited by the length of the spindle, and this tooling is not applicable to workpieces with an adjustable range much larger than the spindle length. Content of the Utility Model

[0004] To solve the technical problem that the existing positioning tooling at the tail end of a numerical control lathe in the above background technique is not applicable to workpieces with an adjustable range much larger than the spindle length, the utility model provides a positioning tooling and a numerical control lathe applying the same.

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

[0006] A positioning tooling includes an installation cylinder and a moving shaft arranged inside it and capable of telescoping coaxially with it. The front end of the installation cylinder is set to be coaxially connectable to the tail end of the machine tool spindle, and the tail end is spirally connected to the tail end of the moving shaft or is provided with a tightening / loosening member capable of fixing / releasing the moving shaft. The moving shaft is set to be able to pass through the spindle, and a positioning disc capable of positioning the workpiece is provided at the front end. Through the above structural design, when this positioning tooling is in use, first insert the workpiece from the front end of the spindle to a preset length, and then drive the positioning disc to move forward in the spindle by adjusting the moving shaft to move forward along the spindle axis. Stop when the positioning disc moves to abut against the workpiece. During batch machining, insert the workpiece into the spindle until it abuts against the positioning disc, thereby realizing the positioning of the workpiece and eliminating the need for repeated measurement during batch machining.

[0007] As the core technical concept of the present utility model, the outer diameter of the positioning disk is smaller than the inner diameter of the installation cylinder. During use, the positioning disk can not only move within the main shaft but also pass through the main shaft and move within the installation cylinder. This increases the moving stroke of the positioning disk, enabling the use of workpieces that extend beyond the length of the main shaft. At the same time, the length of the installation cylinder can be set according to actual conditions. Therefore, when using this positioning tooling to position a workpiece, the adjustable range of the workpiece is no longer limited.

[0008] As a further implementation method:

[0009] The installation cylinder includes an extension cylinder and a connecting sleeve movably arranged at its front end. The installation cylinder is connected to the tail end of the main shaft through the connecting sleeve.

[0010] The connecting sleeve is of a cylindrical structure, with tightening bolts provided on the outer circles at both ends. One end is sleeved on the outer circle of the front end of the extension cylinder, and the other end is arranged to be sleeved on the outer circle of the tail end of the main shaft. The length of the extension cylinder can be set according to actual conditions to be suitable for workpieces with a larger range of length variations.

[0011] The design of the connecting sleeve and its detachable connection method with the main shaft facilitate the replacement, disassembly, and assembly of the extension cylinder. During use, the connection position between the installation cylinder and the main shaft is relatively stressed, and the probability of damage after long-term use is also relatively high. When damage occurs, only the connecting sleeve, this connecting component, needs to be replaced, without the need to replace the whole, which is relatively economical and practical.

[0012] To improve the overall stability of this positioning tooling:

[0013] The tail end of the moving shaft is extended beyond the tail end of the extension cylinder and is locked with a locking nut, which can effectively prevent relative rotation between the moving shaft and the extension cylinder, thereby improving the stability of this positioning tooling during the working process.

[0014] An anti-rotation groove is provided on the outer circle of the front end of the extension cylinder, and the end of the tightening bolt is arranged to be tightened against the bottom of the anti-rotation groove. The anti-rotation groove provides a clear positioning reference for the tightening bolt, ensuring that the tightening bolt can be accurately tightened at the predetermined position, enhancing the overall structural stability. In addition, the tightening bolt is tightened against the bottom of the anti-rotation groove at its end, which also provides a stable fixed point for the extension cylinder and the connecting sleeve, preventing unnecessary radial rotation between them, so as to enhance the connection stability between the extension cylinder and the connecting sleeve, and further improve the stability of this positioning tooling during the working process.

[0015] To further improve the connection strength between the connecting sleeve and the main shaft and the extension cylinder, at least two tightening bolts are provided at both ends of the connecting sleeve.

[0016] Preferably, the tail end of the extension tube is helically connected to the moving shaft, which is simple to process, has a stable and reliable connection, is convenient for disassembly, assembly and adjustment, and has high work efficiency during disassembly, assembly and adjustment.

[0017] The utility model also provides a numerical control lathe, which includes the positioning tooling described above.

[0018] The beneficial effect of the utility model lies in that by setting the outer diameter of the positioning disk to be smaller than the inner diameter of the installation cylinder, the two-way movement of the positioning disk inside the main shaft and inside the installation cylinder is realized, thereby expanding the movement stroke of the positioning disk. Such a design enables the positioning tooling to adapt to workpieces whose length exceeds the main shaft, and the length of the installation cylinder can be adjusted according to actual needs, greatly improving the flexibility of workpiece positioning and the applicable range of the positioning tooling, effectively reducing the repeated measurement work during batch processing, and improving the processing efficiency and accuracy. Description of the Drawings

[0019] In the drawings:

[0020] Figure 1 is a schematic structural diagram (half-sectional view) of a positioning tooling of the utility model;

[0021] Figure 2 is a schematic installation structure diagram of a positioning tooling of the utility model applied in a numerical control lathe;

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

[0023] 1, main shaft; 2, positioning tooling; 21, extension tube; 22, moving shaft; 23, positioning disk; 24, connecting sleeve. Detailed Embodiment

[0024] As Figure 2 shown, this embodiment provides a positioning tooling (positioning tooling), which is usually arranged at the rear end of the lathe main shaft 1 and can be used for adjusting the length of the pipe inserted into the machine tool main shaft 1 during lathe processing of pipes.

[0025] Combined with Figure 1 , the positioning tooling 2 includes an installation cylinder, a moving shaft 22 and a positioning disk 23. The moving shaft 22 is arranged inside the installation cylinder and is coaxial with the installation cylinder. Moreover, the moving shaft 22 can make telescopic movement along the axis of the installation cylinder and can pass through the main shaft 1. The positioning disk 23 is connected to the front end of the moving shaft 22, and the outer diameter of the positioning disk 23 is smaller than the inner diameter of the installation cylinder to ensure that the positioning disk 23 can move inside the installation cylinder. The front end of the installation cylinder is coaxially connected to the tail end of the machine tool main shaft 1, and the tail end of the installation cylinder is connected to the tail end of the moving shaft 22.

[0026] For the moving shaft 22 to make telescopic movement along the axis of the installation cylinder, there are at least the following two implementation methods:

[0027] In the first method, the tail end of the moving shaft 22 can be slidably connected to the inner ring of the tail end of the mounting cylinder, so as to realize the telescopic movement of the moving shaft 22 along the axis of the mounting cylinder. For example, the moving shaft is a spline shaft, and a spline groove is provided on the mounting cylinder corresponding to the moving shaft. However, in this way, when positioning the pipe, the moving shaft may generate axial movement. Therefore, on this basis, a tightening / loosening member capable of fixing / releasing the moving shaft 22 needs to be provided between the tail end of the mounting cylinder and the moving shaft 22. The tightening / loosening member can be a tightening bolt. The tightening bolt is arranged on the outer ring of the tail end of the mounting cylinder, and the inner end of the tightening bolt can abut against the moving shaft 22. At least two tightening bolts are provided. During use, first adjust the moving shaft 22 to a position where the pipe can be inserted into the machine tool spindle 1 to a preset position, then use the tightening bolt to abut against the moving shaft 22, and finally perform the positioning work of the pipe.

[0028] Such as Figure 1 , in the second method, the tail end of the moving shaft 22 is helically connected to the tail end of the mounting cylinder. The helical connection is stable and reliable and has a self-locking function. This method is more convenient to use than the first method. During use, first rotate the moving shaft 22 to a position where the pipe can be inserted into the machine tool spindle 1 to a preset position, and then directly perform the positioning work of the pipe, without other steps.

[0029] In this embodiment, to prevent relative rotation between the moving shaft 22 and the extension cylinder 21, the tail end of the moving shaft 22 extends out of the tail end of the extension cylinder 21 and is locked with a locking nut to improve the stability of the positioning tooling 2 during the working process.

[0030] Regarding the structure of the mounting cylinder, specifically in combination with Figure 1 it is stated that the mounting cylinder includes an extension cylinder 21 and a connection sleeve 24 movably arranged at its front end. The mounting cylinder is connected to the tail end of the spindle 1 through the connection sleeve 24.

[0031] The connection sleeve 24 is of a cylindrical structure. Tightening bolts are provided on the outer rings at both ends thereof. One end is sleeved on the outer ring of the front end of the extension cylinder 21, and the other end is arranged to be sleeved on the outer ring of the tail end of the spindle 1. The length of the extension cylinder 21 can be set according to actual conditions, so that the length adjustment range of the moving shaft 22 can be larger, and thus the positioning tooling 2 can be applied to workpieces with a larger length range change.

[0032] At least two tightening bolts are provided at both ends of the connection sleeve 24 to further improve the connection strength between the connection sleeve 24 and the spindle 1 and the extension cylinder 21.

[0033] Moreover, the design of the connecting sleeve 24 and the detachable connection method between the connecting sleeve 24 and the main shaft 1 facilitate the replacement, disassembly, and assembly of the extension tube 21. During use, the connection position between the installation tube and the main shaft 1 is subject to relatively large force, and the probability of damage after long-term use is also relatively high. When damage occurs, only the connecting component, i.e., the connecting sleeve 24, needs to be replaced, rather than the whole unit, which is relatively economical and practical.

[0034] An anti-rotation groove is provided on the outer circumference of the front end of the extension tube 21, and the end of the tightening bolt abuts against the bottom of the anti-rotation groove. The anti-rotation groove provides a clear positioning reference for the tightening bolt, ensuring that the tightening bolt can accurately abut against the predetermined position, enhancing the overall structural stability. In addition, by the end of the tightening bolt abutting against the bottom of the anti-rotation groove, a stable fixing point is also provided for the extension tube 21 and the connecting sleeve 24, preventing unnecessary radial rotation between them, so as to enhance the connection stability between the extension tube 21 and the connecting sleeve 24, and further improve the stability of the positioning tooling 2 during operation.

[0035] The tail end of the extension tube 21 is helically connected to the moving shaft 22. The connection structure is simple to machine, the connection is stable and reliable, and it is convenient for disassembly, assembly, and adjustment, with high work efficiency during disassembly, assembly, and adjustment.

[0036] For this positioning tooling 2, by setting the outer diameter of the positioning disk 23 to be smaller than the inner diameter of the installation tube, the two-way movement of the positioning disk 23 within the main shaft 1 and within the installation tube is achieved, thus expanding the movement stroke of the positioning disk 23. Such a design enables this positioning tooling 2 to adapt to workpieces whose length exceeds that of the main shaft 1, and the length of the installation tube can be adjusted according to actual needs, greatly improving the flexibility of workpiece positioning and the applicable range of the positioning tooling, effectively reducing the repeated measurement work during batch processing, and enhancing the processing efficiency and accuracy.

[0037] This embodiment also provides a numerically controlled lathe, including the above-mentioned positioning tooling 2.

Claims

1. A positioning tool, characterized in that: It comprises a mounting tube and a moving shaft (22) arranged inside the mounting tube and capable of being coaxially telescopic with the mounting tube; The front end of the mounting tube is configured to be coaxially connected to the rear end of the machine tool spindle (1), and the rear end is spirally connected to the rear end of the moving shaft (22) or a loose piece capable of fixing / loosening the moving shaft (22) is provided between the rear end and the moving shaft (22); The movable shaft (22) is configured to be able to pass through the main shaft (1), and a positioning plate (23) capable of positioning a workpiece is provided at the front end, wherein the outer diameter of the positioning plate (23) is smaller than the inner diameter of the mounting tube.

2. A positioning tool as claimed in claim 1, characterized in that: The installation tube comprises an extension tube (21), a front end of which is movably provided with a connection sleeve (24) and can be connected to the rear end of the main shaft (1) through the connection sleeve (24).

3. A positioning tool as claimed in claim 2, characterized in that: The connecting sleeve (24) is a cylindrical structure, with tightening bolts provided on both ends of the outer ring, and one end is sleeved on the front end outer ring of the extension tube (21), and the other end is configured to be sleeved on the rear end outer ring of the main shaft (1).

4. A positioning tool as claimed in claim 3, characterized in that: The tail end of the movable shaft (22) extends out of the tail end of the extension tube (21) and is provided with a locking nut.

5. A positioning tool as claimed in claim 3, characterized in that: The front end outer ring of the extension tube (21) is provided with an anti-rotation groove, and the end of the tightening bolt is tightened against the bottom of the anti-rotation groove.

6. A positioning tool as claimed in claim 3, characterized in that: At least two tightening bolts are provided at both ends of the connecting sleeve (24).

7. A positioning tool as claimed in claim 2, characterized in that: The tail end of the extension tube (21) is spirally connected to the moving shaft (22).

8. A CNC lathe, characterized in that: A positioning tool comprising any one of claims 1-7.

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