A precision spring collet finishing tool

Abstract

The utility model discloses a kind of precision spring collet finishing tool, comprising: axial tensioning nut, positioning sleeve, connecting sleeve, mandrel, to-be-finished collet;The front end of the mandrel is inserted into the to-be-finished inner hole of the to-be-finished collet, rear end is located in the connecting sleeve, after the mandrel, to-be-finished collet, connecting sleeve are combined and are installed into the positioning sleeve;The axial tensioning nut is located at the rear end of the connecting sleeve and is connected with the connecting sleeve by thread, by tightening the hexagon nut on the axial tensioning nut, the connecting sleeve is tensioned in turn and the to-be-finished collet is tensioned.The tool of the utility model clamps quickly, reliably, can install the whole set of device on chuck of lathe to carry out mechanical finishing, significantly reduce the dependence on personal experience and skill of operator, and compared with artificial grinding, efficiency and finishing quality are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a precision spring collet dressing fixture. Background Technology

[0002] Precision chucks are key components of modern precision machine tool spindles or back spindles, used to clamp workpieces. High-precision chucks are expensive; to reduce operating costs, chucks with minor wear are often refurbished for reuse. Currently, refurbishment is commonly performed manually using a pneumatic grinding head. This method has the following drawbacks: first, it is highly dependent on the operator's experience and skills; second, it is difficult to standardize operations, resulting in low refurbishment efficiency; and finally, the refurbishment process has poor controllability, leading to a low product yield. Utility Model Content

[0003] The purpose of this invention is to provide a precision spring collet trimming fixture to reduce the technical requirements for operators, improve trimming efficiency and pass rate, and solve the problems existing in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A precision spring collet trimming fixture includes: an axial tension nut, a positioning sleeve, a connecting sleeve, a mandrel, and a collet to be trimmed; The front end of the mandrel is inserted into the inner hole of the chuck to be adjusted, and the rear end is located in the connecting sleeve. After the mandrel, the chuck to be adjusted, and the connecting sleeve are assembled, they are installed into the positioning sleeve. The axial tension nut is located at the rear end of the connecting sleeve and is connected to the connecting sleeve by threads. By tightening the hexagonal nut on the axial tension nut, the connecting sleeve is tightened, thereby tightening the chuck to be adjusted.

[0005] Preferably, the mandrel is a precision-ground steel rod, and its outer diameter is consistent with the ideal size of the inner hole to be modified.

[0006] Preferably, the rear end of the chuck to be repaired is installed into the front end of the connecting sleeve using a special chuck removal and installation tool. The front end of the connecting sleeve is provided with an annular hollow groove for accommodating the boss on the chuck to be repaired.

[0007] Preferably, when the chuck to be adjusted is installed in the positioning sleeve, the outer conical surface of the chuck to be adjusted contacts the inner conical surface of the front end of the positioning sleeve.

[0008] Preferably, a groove is provided on the inner conical surface, and the groove cooperates with the positioning pin on the outer conical surface. During installation, the positioning pin is inserted into the groove.

[0009] Preferably, the outer circumferential surface of the positioning sleeve is provided with a flat part.

[0010] The beneficial effects of this utility model are: This utility model provides a precision spring collet dressing fixture. By combining a positioning sleeve, a connecting sleeve, and a mandrel, and assembling them with the collet to be dressed, it achieves precise positioning and clamping of the collet to be dressed, forming a standardized clamping process. Moreover, the fixture is quick and reliable to clamp, and the entire device can be quickly installed on the lathe chuck for mechanical dressing. It significantly reduces the reliance on the operator's personal experience and skills, and compared with manual grinding, the efficiency and dressing quality are greatly improved. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of a precision spring collet trimming fixture according to this utility model; Figure 2 This is a cross-sectional schematic diagram of a precision spring collet dressing fixture. The components in the attached diagram are labeled as follows: 1. Axial tension nut; 2. Positioning sleeve; 3. Connecting sleeve; 4. Mandrel; 5. Collet to be dressed; 6. Inner hole to be dressed; 7. Boss; 8. Hollow groove; 9. Outer conical surface; 10. Inner conical surface; 11. Positioning pin; 12. Groove; 13. Hexagonal nut; 14. Flat part. Detailed Implementation

[0012] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0013] Example: This embodiment describes the structure of a precision spring collet dressing fixture.

[0014] References are attached. Figure 1 , 2 As shown, Figure 1 This is a three-dimensional structural diagram of a precision spring collet dressing fixture according to this utility model. Figure 2 This is a cross-sectional schematic diagram of a precision spring collet dressing fixture.

[0015] The present invention discloses a precision spring collet trimming fixture, comprising: an axial tension nut 1, a positioning sleeve 2, a connecting sleeve 3, a mandrel 4, and a collet 5 to be trimmed. The front end of the mandrel 4 is inserted into the trimming inner hole 6 of the collet 5, and the rear end is located inside the connecting sleeve 3. After assembling the mandrel 4, the collet 5 to be trimmed, and the connecting sleeve 3, the mandrel 4 is installed inside the positioning sleeve 2. The axial tension nut 1 is located at the rear end of the connecting sleeve 3 and is threadedly connected to the connecting sleeve 3. By tightening the hexagonal nut 13 on the axial tension nut 1, the connecting sleeve 3 is tightened, thereby tightening the collet 5 to be trimmed.

[0016] In this embodiment, the mandrel 4 is a precision-ground steel bar, and its outer diameter is consistent with the ideal size of the inner hole 6 to be repaired. The mandrel is used to accurately position the inner hole to be repaired. After assembly, it is machined by boring on a machine tool, which ensures the dimensional accuracy and form and position tolerances after repair, thereby greatly improving the pass rate of repair.

[0017] The rear end of the chuck 5 to be repaired is installed into the front end of the connecting sleeve 3 using a dedicated chuck removal and installation tool. To ensure a secure connection between the chuck 5 and the connecting sleeve, an annular hollow groove 8 is provided at the front end of the connecting sleeve 3 to accommodate the boss on the chuck 5. Furthermore, when the chuck 5 is installed into the positioning sleeve 2, the outer conical surface 9 of the chuck 5 contacts and engages with the inner conical surface 10 at the front end of the positioning sleeve 2. A groove 12 is also provided on the inner conical surface 10, which engages with a positioning pin 11 on the outer conical surface 10. During installation, the positioning pin 11 is inserted into the groove 12 to achieve circumferential positioning, further ensuring the stability of the installation.

[0018] A flat part 14 is also provided on the outer circular surface of the positioning sleeve 2 to facilitate the fixing of the positioning sleeve 2 when the axial tensioning nut 1 is tightened.

[0019] During installation, tightening the hexagonal nut 13 on the axial tension nut 1 with a wrench will tighten the connecting sleeve 3, thereby axially tightening the chuck 5 to be adjusted. Once the chuck 5 to be adjusted retracts under the action of the conical surface of the positioning sleeve 2 and clamps the mandrel 4, tightening can be stopped. At this point, a wrench can be used to hold the flat section 14 machined on the outer surface of the positioning sleeve 2 to prevent it from rotating when tightening the nut.

[0020] After assembly, place the assembled fixture into the three-jaw chuck of the lathe and gently clamp it at the flat position 14 of the positioning sleeve 2. After calibrating and adjusting the radial runout of the entire assembly to less than 0.01mm using a dial indicator, a boring tool can be used to bore and trim the inner hole 6 of the collet 5 to be trimmed. The trimming amount is usually controlled within 0.02 to 0.05mm on one side. After trimming, disassemble the fixture to obtain the repaired precision spring collet.

[0021] This utility model presents a precision spring collet repair fixture with an ingenious design and simple structure. By assembling the axial tension nut, positioning sleeve, connecting sleeve, mandrel, and collet to be repaired, and then machining it on a lathe, the worn precision spring collet can be repaired. This mechanized repair method reduces the technical requirements for operators, while improving repair efficiency and pass rate, and reducing production costs.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A precision spring collet dressing fixture, characterized in that, include: Axial tension nut (1), positioning sleeve (2), connecting sleeve (3), mandrel (4), chuck to be adjusted (5); The front end of the mandrel (4) is inserted into the inner hole (6) of the chuck (5) to be repaired, and the rear end is located in the connecting sleeve (3). After the mandrel (4), the chuck (5) to be repaired and the connecting sleeve (3) are assembled, they are installed in the positioning sleeve (2). The axial tension nut (1) is located at the rear end of the connecting sleeve (3) and is connected to the connecting sleeve (3) by threads. The connecting sleeve (3) is tightened by tightening the hexagonal nut (13) on the axial tension nut (1), thereby tightening the chuck (5) to be repaired.

2. The precision spring collet dressing fixture according to claim 1, characterized in that: The mandrel (4) is a precision-ground steel rod, and its outer diameter is consistent with the ideal size of the inner hole (6) to be repaired.

3. The precision spring collet dressing fixture according to claim 1, characterized in that: The rear end of the chuck to be repaired (5) is installed into the front end of the connecting sleeve (3) using a special chuck removal and installation tool. The front end of the connecting sleeve (3) is provided with an annular hollow groove (8) for accommodating the boss (7) on the chuck to be repaired (5).

4. The precision spring collet dressing fixture according to claim 1, characterized in that: When the chuck to be adjusted (5) is installed into the positioning sleeve (2), the outer conical surface (9) of the chuck to be adjusted (5) contacts the inner conical surface (10) at the front end of the positioning sleeve (2).

5. The precision spring collet dressing fixture according to claim 4, characterized in that: A groove (12) is provided on the inner conical surface (10). The groove (12) cooperates with the positioning pin (11) on the outer conical surface (9). During installation, the positioning pin (11) is inserted into the groove (12).

6. The precision spring collet dressing fixture according to claim 1, characterized in that: The outer circular surface of the positioning sleeve (2) is provided with a flat part (14).

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