Numerical control lathe chuck and clamping force control method

Abstract

The invention discloses a numerical control lathe chuck and a clamping force control method, and relates to the technical field of numerical control lathes. The numerical control lathe chuck is characterized by comprising a chuck body, a sleeve and a nut, and the sleeve and the nut are connected to the outer side of the chuck body in a sleeving mode; the inner side of the front end of the sleeve is provided with a trumpet-shaped inner wedge-shaped surface with a large front part and a small rear part; one end of the chuck is provided with a clamping part, the outer side of the clamping part is provided with an outer wedge-shaped surface which is matched with the inner wedge-shaped surface, the diameter of the outer wedge-shaped surface is large in the front and small in the rear, and a plurality of interval grooves which divide the clamping part into a plurality of petal-shaped structures are distributed in the outer wedge-shaped surface at equal radians; and the nut is used for adjusting the depth of the chuck inserted into the sleeve. The abutting matching relation between the chuck and the connecting pipe is adjusted through rotation of the nut, so that the effect of accurately controlling the clamping force of the chuck is effectively achieved, the equipment debugging time is effectively saved, the quality of machined products is improved, the clamping force of machined workpieces is proper, and abnormal abrasion is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of numerically controlled lathes, and more particularly to a chuck for a numerically controlled lathe and a clamping force control method. Background Art

[0002] The chuck of a CNC lathe is one of the important auxiliary tools used to clamp the workpiece to complete CNC machining of the workpiece.

[0003] In existing technology, adjusting the clamping force does not pose any significant processing issues for products requiring machining of the workpiece's outer diameter. Conventionally, the clamping force is adjusted slightly higher. Even if this causes damage to the workpiece's outer diameter, this can be resolved by re-lathing the workpiece's outer diameter. Furthermore, insufficient clamping force in the chuck is a major taboo in CNC lathe machining, as it can cause serious machining accidents such as collisions, damage to tools and chucks, and unstable product quality.

[0004] However, there are currently workpieces with external circles that cannot be reprocessed, such as the external circle structure of the worm, which is a formed structure and does not allow clamping marks to be produced, otherwise it will cause serious defects in the motor. If the clamping force is lowered, processing accidents will occur, which needs to be improved. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the first object of the present invention is to provide a method for controlling the clamping force of a CNC lathe chuck, which has the effect of preventing damage to external cylindrical workpieces and facilitating construction.

[0006] To achieve the above object, the present invention provides the following technical solutions: A chuck for a numerically controlled lathe comprises a chuck, a sleeve sleeved on the outside of the chuck, and a nut; the inner side of the front end of the sleeve is provided with an inner wedge-shaped surface that is trumpet-shaped and larger at the front and smaller at the rear; one end of the chuck is provided with a clamping portion, the outer side of the clamping portion is provided with an outer wedge-shaped surface that matches the inner wedge-shaped surface and has a larger diameter at the front and smaller at the rear, and a plurality of spacing grooves are distributed at equal arcs to divide the clamping portion into a plurality of petal-shaped structures; the nut is used to adjust the depth to which the chuck is inserted into the sleeve.

[0007] Preferably, the nut is used to be fixed on a CNC machine tool.

[0008] Preferably, the rear end of the chuck is provided with an adjusting tail, the adjusting tail is detachably connected and fixed with a connecting pipe, and the connecting pipe is threadedly connected to the nut.

[0009] Preferably, a tail inner groove is provided in the connecting tube, a head inner groove is provided in the chuck, and the head inner groove is communicated with the tail inner groove.

[0010] Preferably: the front end of the connecting pipe is provided with a connecting sleeve, and the rear end is provided with a telescopic tail; the adjusting tail is inserted into the connecting sleeve and threadedly connected; the nut is threadedly connected to one side of the outer circumference of the telescopic tail.

[0011] A second object of the present invention is to provide a method for controlling the clamping force of a CNC lathe chuck, comprising using the CNC lathe chuck as described above, and comprising the following steps: Step 1: Insert the go gauge into the inside of the chuck and keep the go gauge, stop gauge and the axis of the chuck parallel; Step 2: Rotate the nut to reduce the collet to a size equal to or larger than the go gauge diameter and smaller than the stop gauge diameter; Step 3: Tighten the nut. Through the above scheme, it can be seen that the present application provides a CNC lathe chuck and clamping force control method, which effectively achieves the effect of accurately controlling the clamping force of the chuck by rotating the nut to adjust the abutment and matching relationship between the chuck and the connecting pipe, and effectively saves equipment debugging time and improves the quality of processed products, so that the clamping force of the processed workpiece is appropriate and prevents abnormal wear. The clamping force control method of the CNC lathe chuck changes the size of the chuck by rotating the nut, so that when the through gauge can enter the inside of the chuck and the stop gauge cannot enter, the chuck can be effectively fixed by rotating the nut to lock the chuck, significantly improving the control accuracy of the chuck opening size and the size of the clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of this embodiment; Figure 2 It is a schematic cross-sectional structural diagram of this embodiment.

[0013] Explanation of the accompanying drawings: 1. Sleeve; 11. Inner wedge surface; 2. Nut; 3. Collet; 31. Clamping part; 311. Outer wedge surface; 312. Spacing groove; 32. Adjusting tail; 33. Head inner groove; 4. Connecting pipe; 41. Connecting sleeve; 42. Telescopic tail; 43. Tail inner groove. DETAILED DESCRIPTION

[0014] To make the technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0015] like Figure 1 As shown, like Figure 1As shown, a chuck for a CNC lathe comprises a chuck 3, a sleeve 1 sleeved on the outside of the chuck 3, and a nut 2. The nut 2 is used to adjust the insertion depth of the chuck 3 into the sleeve 1 and, through the contact between the sleeve 1 and the chuck 3, applies a force toward the axis of the chuck 3. This force is balanced and stable, effectively controlling the chuck 3 to apply precise holding force to the workpiece while clamping it, thereby effectively preventing abnormal wear on the workpiece.

[0016] like Figure 1 、 Figure 2 As shown, a trumpet-shaped inner wedge surface 11, larger in diameter at the front and narrower in the back, is provided on the inner side of the front end of the sleeve 1. The inner wedge surface 11 serves as an inclined surface that contacts and acts on the chuck 3, and has a smooth surface. A clamping portion 31 is provided at one end of the chuck 3, and an outer wedge surface 311, matching the inner wedge surface 11 and having a larger diameter at the front and narrower in the back, is provided on the outer side of the clamping portion 31. The outer wedge surface 311 serves as an inclined surface that contacts and contacts the inner wedge surface 11, and has a smooth surface. Furthermore, to ensure that the chuck 3 can deform and clamp under applied force, a plurality of spacing grooves 312 are distributed on the chuck 3 in equal arcs, dividing the clamping portion 31 into a plurality of petal-like structures. Therefore, when the depth of the chuck 3 inserted into the sleeve 1 is adjusted by the nut 2, the inner wedge surface 11 and the outer wedge surface 311 are in contact with each other, and the inner wedge surface 11 applies a force to the outer wedge surface 311 and causes the multiple petal-like structures of the clamping portion 31 to deform inward, thereby achieving the purpose of effectively clamping the workpiece.

[0017] It should be mentioned that, in order to reduce the difficulty of adjustment and improve the efficiency of operation, the nut 2 in the embodiment of the present application is used to be fixed on a CNC machine tool. Therefore, when clamping a workpiece of a single fixed model, by clamping and fixing each clamped workpiece accordingly, the difficulty of adjusting the workpiece clamping force can be reduced and the efficiency of workpiece operation can be improved while effectively ensuring the safety of the operation. At the same time, in order to improve the convenience of adjustment of the chuck 3 and the convenience of adjustment according to workpieces of different specifications and models, an adjustment tail 32 is provided at the rear end of the chuck 3, and the adjustment tail 32 is detachably connected and fixed with a connecting pipe 4. Among them, the connecting pipe 4 is threadedly connected to the nut 2, thereby significantly reducing the difficulty of connection and fixing while achieving the purpose of convenient replacement and matching of workpieces of different specifications and models.

[0018] like Figure 2 As shown, a tail inner groove 43 is provided in the connecting tube 4, and a head inner groove 33 is provided in the chuck 3. The head inner groove 33 communicates with the tail inner groove 43. During installation, the workpiece is inserted into the head inner groove 33 or into the cavity connecting the head inner groove 33 and the tail inner groove 43, thereby achieving the purpose of stable and effective clamping of the workpiece.

[0019] The connecting tube 4 is provided with a connecting sleeve 41 at its front end and a telescopic tail 42 at its rear end. The adjustment tail 32 is inserted into and threaded into the connecting sleeve 41, and the nut 2 is threadedly connected to the outer circumference of the telescopic tail 42. Therefore, rotating the nut 2 drives the telescopic tail 42 to move circumferentially, thereby adjusting the insertion depth of the chuck 3 within the sleeve 1. This results in easy adjustment and high adjustment precision.

[0020] A method for controlling the clamping force of a CNC lathe chuck includes using the CNC lathe chuck as described above, and includes the following steps: Step 1: Insert the go gauge into the inside of the chuck and keep the go gauge, stop gauge and the axis of the chuck parallel; Step 2: Rotate the nut to reduce the collet to a size equal to or larger than the go gauge diameter and smaller than the stop gauge diameter; Step 3: Tighten the nut.

[0021] This method for controlling the clamping force of a CNC lathe chuck provides a simple and precise way to control the lathe's clamping force. During use, the go-no-go gauge, which comprises a go gauge and a no-go gauge and consists of two corresponding cylinders, one large and one small, is used to determine the size of the aperture and, in this embodiment, precisely adjust the clamping force of the chuck 2.

[0022] For example, if the go gauge has a diameter of 6mm and the no-go gauge has a diameter of 8mm, if the aperture is 7mm, the go gauge can enter but the no-go gauge cannot, and the aperture is qualified. If the aperture is 5mm, the go gauge and the no-go gauge cannot enter, and the aperture is unqualified. And if the aperture is 9mm, both the go gauge and the no-go gauge can enter, and the aperture is unqualified.

[0023] The embodiment of the present application adopts a stop gauge to match the chuck 3 and the nut 2, so as to effectively control the deformation of the chuck 3 when the relative position of the connecting pipe and the sleeve is adjusted radially, and control the clamping force to be decomposed along the radial and axial directions, thereby effectively reducing the changing trend of the clamping force of the radial clamping force, and coordinating the axial force to achieve the purpose of effectively controlling the clamping force of the chuck 2.

[0024] In summary, the present application provides a CNC lathe chuck, which adjusts the abutment and matching relationship between the chuck 3 and the connecting tube 4 by rotating the nut 2, thereby effectively achieving the effect of accurately controlling the clamping force of the chuck 3, effectively saving equipment debugging time and improving the quality of processed products, so that the clamping force of the processed workpiece is appropriate and prevents abnormal wear. The clamping force control method of the CNC lathe chuck changes the size of the chuck 3 by rotating the nut 2, so that when the through gauge can enter the inside of the chuck and the stop gauge cannot enter, the purpose of effectively controlling the clamping force of the chuck 2 can be achieved by rotating the nut to lock the chuck, significantly improving the control accuracy of the opening size of the chuck 2 and the size of the clamping force.

[0025] References to "first," "second," "third," "fourth," and the like (if any) herein are intended to distinguish similar objects and are not necessarily intended to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, or apparatus.

[0026] It should be noted that the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0027] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A chuck for a CNC lathe, characterized by: The invention comprises a chuck (3), a sleeve (1) sleeved on the outside of the chuck (3), and a nut (2); the inner side of the front end of the sleeve (1) is provided with an inner wedge-shaped surface (11) in the shape of a trumpet and larger at the front and smaller at the back; one end of the chuck (3) is provided with a clamping portion (31); the outer side of the clamping portion (31) is provided with an outer wedge-shaped surface (311) matching the inner wedge-shaped surface (11) and having a larger diameter at the front and smaller at the back, and a plurality of spacing grooves (312) are distributed at equal arcs to divide the clamping portion (31) into a plurality of petal-shaped structures; the nut (2) is used to adjust the depth of the chuck (3) inserted into the sleeve (1).

2. The chuck for a CNC lathe according to claim 1, characterized in that: The nut (2) is used for fixing on a numerically controlled machine tool.

3. The chuck for a CNC lathe according to claim 1, characterized in that: The rear end of the chuck (3) is provided with an adjusting tail (32), and the adjusting tail (32) is detachably connected and fixed with a connecting pipe (4), and the connecting pipe (4) is threadedly connected to the nut (2).

4. The chuck for a CNC lathe according to claim 3, characterized in that: A tail inner groove (43) is provided in the connecting pipe (4), a head inner groove (33) is provided in the chuck (3), and the head inner groove (33) is communicated with the tail inner groove (43).

5. The chuck for a CNC lathe according to claim 3, characterized in that: The front end of the connecting pipe (4) is provided with a connecting sleeve (41), and the rear end is provided with a telescopic tail (42); the adjusting tail (32) is inserted into the connecting sleeve (41) and threadedly connected; the nut (2) is threadedly connected to one side of the outer periphery of the telescopic tail (42).

6. A method for controlling the clamping force of a CNC lathe chuck, comprising using a CNC lathe chuck according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Insert the go gauge into the inside of the chuck and keep the go gauge, stop gauge and the axis of the chuck parallel; Step 2: Rotate the nut to reduce the collet to a size equal to or larger than the go gauge diameter and smaller than the stop gauge diameter; Step 3: Tighten the nut.

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