Clamping and positioning device for small-diameter part

Abstract

The utility model relates to the technical field of part machining equipment, in particular to a clamping and positioning device for small-diameter parts. The utility model provides a clamping and positioning device for a small-diameter part, which comprises an extension component, a clamping component, a positioning component, a clamping component, a clamping component, a clamping component, a clamping component, a clamping component, a clamping component, a clamping component and a positioning component, and is characterized in that the extension component is provided with a clamping end and a positioning end, the extension component is fixedly connected with a three-jaw chuck of a machine tool; the positioning assembly is arranged in the axial stepped hole and comprises a positioning column and a spring chuck, one end of the positioning column is inserted into the axial stepped hole, the other end of the positioning column is inserted into a central inner through hole of the spring chuck, and the small-diameter part is clamped in the spring chuck; and the compression nut is arranged at the end part of the positioning end of the extension assembly in a sleeving manner so as to compress the spring chuck and fix the spring chuck on the extension assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and specifically, the utility model relates to a clamping and positioning device for small-diameter parts. Background Art

[0002] Currently, small-diameter parts are increasingly widely used, and the processing requirements are also becoming more and more strict. Whether it is turning or milling, the existing processing of small-diameter parts usually uses a three-jaw chuck for clamping, which has the following limitations:

[0003] Due to their small size, small-diameter parts are difficult to be effectively clamped by a three-jaw chuck and are prone to sliding or loosening. Since the exposed length of the parts is short, long cutting tools are generally used to avoid interference with the three-jaw chuck, resulting in reduced stability of the cutting tool and the parts during the processing. During turning, due to the lack of accurate positioning function of the three-jaw chuck, tool setting is required before each processing, which is particularly time-consuming and laborious in mass production. In addition, direct clamping by the three-jaw chuck may cause damage to the surface of the parts, and protection needs to be carried out between the jaws and the parts, with cumbersome operation and low efficiency. If special tooling is made for parts of different diameters respectively, it not only increases the cost but also prolongs the processing cycle, affecting production efficiency.

[0004] Therefore, it is urgent to develop a clamping and positioning device for small-diameter parts with stability, positioning accuracy, convenient operation and adjustability. Summary of the Utility Model

[0005] The utility model provides a clamping and positioning device for small-diameter parts to at least solve the problems of inaccurate positioning, cumbersome operation, low efficiency and easy tool interference of the existing clamping devices for small-diameter parts.

[0006] To achieve the above object, the utility model provides a clamping and positioning device for small-diameter parts, including:

[0007] An extension component, having a clamping end and a positioning end, the extension component is fixedly connected to the three-jaw chuck of the machine tool through the clamping end, and an axial stepped hole is provided at the positioning end;

[0008] A positioning component, the positioning component is installed in the axial stepped hole, including a positioning column and a spring collet, one end of the positioning column is inserted into the axial stepped hole, and the other end is inserted into the central inner through hole of the spring collet, and the small-diameter part is clamped in the spring collet;

[0009] A compression nut, the compression nut is sleeved on the end of the positioning end of the extension component to compress the spring collet so that it is fixed to the extension component.

[0010] Further, the positioning column includes:

[0011] A base, which is installed in the axial stepped hole and has a countersunk threaded hole on it.

[0012] A single-headed stud, the threaded end of which is screwed to the base through the countersunk threaded hole, and the non-threaded end is inserted into the central inner hole of the spring collet.

[0013] Further, the bottom hole of the axial stepped hole is a cylindrical hole, and the guiding hole is a conical hole. The base is installed in the cylindrical hole, and its non-threaded hole end face is in close contact with the bottom surface of the cylindrical hole; the spring collet is installed in the conical hole.

[0014] Further, the spring collet has a clamping end, the clamping end extends out of the conical hole, the small-diameter part is clamped by the clamping end through the central inner through-hole, and the non-machined end face of the small-diameter part is in close contact with the end face of the non-threaded end of the single-headed stud.

[0015] Further, the threaded end of the single-headed stud is provided with a thread having an adjustment allowance.

[0016] Further, the compression nut is provided with a central hole to enable the small-diameter part to pass through.

[0017] Further, the spring collet is provided with a spring collet positioning groove, and a positioning eccentric ring is arranged in the central hole of the compression nut and is matched with the spring collet positioning groove.

[0018] Further, the outer side of the positioning end of the extension assembly is provided with a thread and is screwed to the compression nut.

[0019] Further, the clamping end of the extension assembly is a cylindrical long handle.

[0020] Further, the cylindrical long handle is internally provided with an axial weight-reducing hole.

[0021] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0022] The present utility model provides a clamping and positioning device for small-diameter parts. The small-diameter parts can be clamped more stably and accurately, thereby reducing the sliding or loosening phenomenon during the machining process. At the same time, the tool interference problem is effectively avoided through the extension assembly device, and the surface of the part to be machined is prevented from being damaged by the three-jaw chuck, ensuring the machining quality and improving the machining accuracy.

[0023] The present utility model has an adjustable design, the spring collet is replaceable, and the length of the positioning stud with a screwed connection design is adjustable, which can meet the clamping requirements of small-diameter parts with different lengths and different diameters, reduce the additional cost and material waste caused by custom tooling, shorten the machining cycle, and improve the production efficiency.

[0024] The clamping and positioning device for small-diameter parts of the present utility model has a simple structure, is convenient to operate, and can be quickly clamped, which is beneficial to improving production efficiency. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the clamping and positioning device for small-diameter parts of the present utility model;

[0026] Figure 2 It is a clamping schematic diagram of the clamping and positioning device for small-diameter parts of the present utility model;

[0027] Figure 3 It is a schematic structural diagram of the positioning column of the present utility model;

[0028] Figure 4 It is a schematic structural diagram of the extension assembly of the present utility model;

[0029] In the above figures:

[0030] 1. Extension assembly; 2. Positioning column; 21. Base; 22. Single-headed stud; 3. Spring collet; 4. Compression nut; 5. Three-jaw chuck; 6. Small-diameter part; A. Central inner through-hole; B. Threaded counterbore; C. Cylindrical hole; D. Tapered hole. Detailed Embodiment

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0034] As Figures 1 to 4 shown, the present utility model provides a clamping and positioning device for small-diameter parts to stably and accurately clamp small-diameter parts with different diameters and lengths.

[0035] As Figures 1 - 2 shown, the present utility model provides a clamping and positioning device for small-diameter parts, including: an extension assembly 1, a positioning assembly, and a compression nut 4.

[0036] The extension assembly 1 has a clamping end and a positioning end. The extension assembly 1 is fixedly connected to the three-jaw chuck 5 of the machine tool through the clamping end, and an axial stepped hole is provided at the positioning end;

[0037] The positioning assembly is installed in the axial stepped hole and includes a positioning post 2 and a collet chuck 3. One end of the positioning post 2 is inserted into the axial stepped hole, and the other end is inserted into the central inner through-hole A of the collet chuck 3. The small-diameter part 6 is clamped in the collet chuck 3;

[0038] The compression nut 4 is sleeved on the end of the positioning end of the extension assembly 1 to compress the collet chuck 3 and fix it to the extension assembly 1.

[0039] As Figure 3 shown, Figure 3 is a schematic diagram of the positioning post structure. Preferably, the positioning post 2 includes a base 21 and a single-headed stud 22; the base 21 is installed in the axial stepped hole, and a threaded counterbore B is provided thereon; the threaded end of the single-headed stud 22 is screwed to the base 21 through the threaded counterbore B, and the non-threaded end is inserted into the central inner hole A of the collet chuck 3.

[0040] In some embodiments, the threaded end of the single-headed stud 22 is provided with a thread having an adjustment margin. By rotating the single-headed stud 22, the length of the single-headed stud 22 can be adjusted, thereby adjusting the remaining clamping space of the central inner through-hole of the collet chuck 3 to adapt to small-diameter parts 6 with different lengths.

[0041] As Figure 4 shown, Figure 4Schematic structural diagram of the extension component 1. Preferably, the bottom hole of the axial stepped hole is a cylindrical hole C, and the guiding hole is a conical hole D. The base 21 is installed in the cylindrical hole C, and its end face without a threaded hole is in close contact with the bottom surface of the cylindrical hole C; the spring chuck 3 is installed in the conical hole D.

[0042] In some embodiments, the clamping end of the extension component 1 is a cylindrical long handle, and an axial weight-reducing hole is provided inside the cylindrical long handle; a thread is provided on the outer side of the positioning end of the extension component 1 and is screwed with the compression nut 4. The extension component 1 can use an existing tool extension rod to further reduce the cost of the device.

[0043] As Figure 1 and Figure 2 shown, preferably, the spring chuck 3 has a clamping end that protrudes from the conical hole D. The small-diameter part 6 is clamped to the clamping end through the central inner through-hole A, and the non-machined end face of the small-diameter part 6 is in close contact with the end face of the non-threaded end of the single-headed stud 22.

[0044] In some embodiments, the compression nut 4 is provided with a central hole to allow the small-diameter part 6 to pass through. The spring chuck 3 is provided with a spring chuck positioning groove, and a positioning eccentric ring is provided in the central hole of the compression nut 4 and is matched with the spring chuck positioning groove.

[0045] Preferably, in actual operation, the steps of clamping the small-diameter part 6 using this device are specifically as follows:

[0046] First, screw the threaded end of the single-headed stud 22 into the threaded counterbore B of the base 21, adjust the screw length of the single-headed stud 22 according to the length of the small-diameter part 6, and complete the assembly of the positioning post 2;

[0047] Clamp the clamping end of the extension component 1, that is, the cylindrical long handle, on the three-jaw chuck 5. After aligning and leveling the extension component 1, insert the assembled positioning post 2 into the axial stepped hole at its positioning end, so that the end face of the non-threaded hole of the base 21 of the positioning post 2 is in close contact with the bottom surface of the cylindrical hole C;

[0048] Insert the positioning groove of the spring chuck 3 into the position of the positioning eccentric ring of the compression nut 4, and push the spring chuck 3 until a clicking sound is heard, indicating that the spring chuck 3 is installed in place. Socket the central inner hole A of the spring chuck 3 onto the non-threaded end of the single-headed stud 22, and lightly tighten the compression nut 4 a few times;

[0049] Install the small-diameter part 6 into the central inner hole A at the clamping end of the spring chuck 3, so that the non-machined end face of the small-diameter part 6 is in close contact with the end face of the non-threaded end of the single-headed stud 22, and tighten the compression nut 4 with a wrench to complete the clamping of the small-diameter part 6.

[0050] Start the machine tool for processing. After the processing is completed, loosen the clamping nut 4 by a few turns, take out the processed small-diameter part 6, clamp the next small-diameter part 6 of the same size to be processed in the central inner hole A of the spring collet 3, tighten the clamping nut 4, and directly process without tool setting, effectively improving the processing efficiency.

[0051] The above are only the preferred embodiments of the present invention, and are not limitations on the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A clamping and positioning device for small-diameter parts, characterized in that Comprising: An extension component with a clamping end and a positioning end. The extension component is fixedly connected to the three-jaw chuck of the machine tool through the clamping end, and an axial stepped hole is provided at the positioning end; A positioning component which is installed in the axial stepped hole and includes a positioning post and a collet. One end of the positioning post is inserted into the axial stepped hole, and the other end is inserted into the central inner through-hole of the collet. The small-diameter part is clamped by the collet; A compression nut which is sleeved on the end of the positioning end of the extension component to compress the collet and fix it to the extension component.

2. The clamping and positioning device for small-diameter parts according to claim 1, wherein, The positioning post includes: A base which is installed in the axial stepped hole and has a threaded counterbore on it; A single-headed stud. The threaded end of the single-headed stud is screwed to the base through the threaded counterbore, and the non-threaded end is inserted into the central inner hole of the collet.

3. The clamping and positioning device for small-diameter parts according to claim 2, wherein The bottom hole of the axial stepped hole is a cylindrical hole, and the guiding hole is a conical hole. The base is installed in the cylindrical hole, and its non-threaded hole end face is in close contact with the bottom face of the cylindrical hole; the collet is installed in the conical hole.

4. The clamping and positioning device for small-diameter parts according to claim 3, characterized in that The collet has a clamping end which protrudes from the conical hole. The small-diameter part is clamped by the clamping end through the central inner through-hole, and the non-machined end face of the small-diameter part is in close contact with the end face of the non-threaded end of the single-headed stud.

5. The clamping and positioning device for small-diameter parts according to claim 2, characterized in that The threaded end of the single-headed stud is provided with a thread having an adjustment margin.

6. The clamping and positioning device for small-diameter parts according to claim 1, characterized in that, The compression nut is provided with a central hole to allow the small-diameter part to pass through.

7. The clamping and positioning device for small-diameter parts according to claim 1, wherein The collet is provided with a collet positioning groove, and a positioning eccentric ring is arranged in the central hole of the compression nut and is matched with the collet positioning groove.

8. The clamping and positioning device for small-diameter parts according to claim 1, wherein, The outer side of the positioning end of the extension component is provided with a thread for screwing with the compression nut.

9. The clamping and positioning device for small-diameter parts according to claim 1, characterized in that, The clamping end of the extension component is a cylindrical long handle.

10. The clamping and positioning device for small-diameter parts according to claim 9, characterized in that, An axial weight-reducing hole is arranged inside the cylindrical long handle.

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