Shaft outer circle machining clamping fixture
By designing a clamping fixture for machining the outer diameter of shafts, the problem of difficult clamping of special shaft parts was solved, achieving efficient and reliable machining results, and it is suitable for shaft parts with special shapes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QIQIHAR NORTH MACHINERY CORP
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-09
AI Technical Summary
The chucks of ordinary lathes or CNC lathes are difficult to effectively clamp special shaft parts, resulting in low machining accuracy and efficiency.
Design a clamping fixture for machining the outer diameter of shafts, including a mandrel, washer, and nut. The fixture utilizes the multiple components of the mandrel to form an integral structure on the same axis, combined with a lathe three-jaw chuck and tailstock center, to achieve reliable clamping and rotation of the parts.
It improves the machining accuracy and efficiency of the outer diameter of special shaft parts, ensures machining quality, reduces fixture manufacturing costs and cycle time, and is suitable for machining workpieces with similar shapes.
Smart Images
Figure CN224334013U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a clamping fixture for machining the outer diameter of shafts, belonging to the field of mechanical technology. Background Technology
[0002] Shaft parts are the most common type of parts in machining. Ordinary shaft parts are machined by rotating the workpiece using a chuck on a conventional lathe or CNC lathe, with the cutting tool feeding the workpiece to complete the cutting. However, some shaft parts, due to their shape and structure, cannot be machined simply by chuck clamping. They require tooling fixtures designed according to their structure to assist in machining. The structure of these tooling fixtures varies depending on the part's shape. This explanation focuses on the machining of the outer diameter of a specific type of shaft part. The part to be machined is shown in the attached image. Figure 2 As shown, when machining this part, according to the characteristics of the part, it is necessary to arrange turning, milling and other process procedures. When machining the outer diameter φ25h7, the part cannot be clamped by a three-jaw chuck. Using a four-jaw chuck to clamp the part can only ensure two clamps, and the jaws in two directions are suspended. This is not allowed in the machining process. The part can only be clamped by designing a fixture to ensure the machining accuracy and efficiency of the part. Utility Model Content
[0003] To overcome the shortcomings of the existing technology, this utility model provides a clamping fixture for machining the outer diameter of shafts. This fixture is versatile, simple, flexible, and easy to operate for machining the outer diameter of shafts with special shapes, and solves the problem of difficult clamping and machining of parts with special structures.
[0004] The technical solution adopted by this utility model to solve its technical problem is: a clamping fixture for machining the outer diameter of a shaft, including a mandrel, a washer and a nut. The mandrel includes a shaft head, a transition body, a limiting block, a shaft body and a stud. A convex-shaped transition body is provided on one side of the shaft head, and a flat cylindrical limiting block is provided on the other side of the transition body. A cylindrical shaft body is provided on the other side of the limiting block, and a stud is provided at the other end of the shaft body. After the washer passes through the stud, the nut is threadedly connected to the stud.
[0005] Furthermore, the shaft head, transition body, limiting block, shaft body, and stud are integrated into one structure, and the center of the shaft head, the center of the transition body, the center of the limiting block, the center of the shaft body, and the center of the stud are all on the same axis.
[0006] Furthermore, the mandrel is designed with center holes at both ends, A1.5-GB / T145-2001.
[0007] The beneficial effects of this utility model are as follows: This utility model is universal, simple, flexible in application, and easy to operate for machining the outer diameter of shaft-type parts with special shapes. By designing a clamping fixture, the workpiece is assembled into the fixture and then secured to ensure reliable clamping. The fixture is then tightened by the lathe's three-jaw chuck and the lathe's tailstock center. Rotating the fixture drives the workpiece to rotate, solving the problem of difficult clamping and machining of parts with special structures. After the part is assembled by the clamping fixture, it is guaranteed that the workpiece can be rotated and machined on the lathe, which not only meets the drawing requirements and ensures machining accuracy but also improves machining efficiency. After machining, the workpiece's dimensional accuracy is stabilized, greatly improving the reliability of the part. This efficient, energy-saving, and environmentally friendly clamping application is suitable for similar parts. This type of fixture is easy to manufacture and highly operable, saving manufacturing costs and time while improving production efficiency. This type of fixture can be extended to the design of fixtures for machining similar shaped workpieces. Attached Figure Description
[0008] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0009] Figure 1 This is a schematic diagram of the structure of this utility model.
[0010] Figure 2 This is a schematic diagram of the part.
[0011] Figure 3 yes Figure 2 The left view.
[0012] Figure 4 This is a clamping diagram of the present invention in use.
[0013] Figure 5 This is a schematic diagram of the central hole of this utility model.
[0014] Numbering on the map:
[0015] 1. Mandrel, 101. Shaft head, 102. Transition body, 103. Limiting block, 104. Shaft body, 105. Stud, 2. Washer, 3. Nut, 4. Part. Detailed Implementation
[0016] like Figure 1As shown in Figure 5, a clamping fixture for machining the outer diameter of a shaft includes a mandrel 1, a washer 2, and a nut 3. The mandrel 1 further includes a shaft head 101, a transition body 102, a limiting block 103, a shaft body 104, and a stud 105. A U-shaped transition body 102 is provided on one side of the shaft head 101, and a flat cylindrical limiting block 103 is provided on the other side of the transition body 102. A cylindrical shaft body 104 is provided on the other side of the limiting block 103, and a stud 105 is provided at the other end of the shaft body 104. After the washer 2 passes through the stud 105, the nut 3 is threadedly connected to the stud 105.
[0017] The shaft head 101, transition body 102, limiting block 103, shaft body 104 and stud 105 are integrated into one structure. The center of the shaft head 101, the center of the transition body 102, the center of the limiting block 103, the center of the shaft body 104 and the center of the stud 105 are all on the same axis. The mandrel 1 is made of high-strength steel that is easy to quench.
[0018] To ensure the accuracy requirements and surface roughness Ra1.6μm of the outer diameter φ25h7 of part 4, the φ13H7 inner hole of part 4, which has already been machined, is used as the positioning reference for clamping part 4 during the design of this fixture. When machining the φ13H7 inner hole of part 4, the process requires that the perpendicularity between the end face of the hole and the hole be within 0.005mm, and the end face can be used as the limit for clamping the fixture.
[0019] When clamping part 4 with a clamping fixture, machining errors will accumulate. We should try to make the reference consistent and avoid repeated positioning. During the design of the fixture, the center of the fixture is matched with the center of the lathe, so that there will be no eccentric clamping during the clamping of part 4.
[0020] The mandrel 1 needs to repeatedly clamp part 4. The mandrel 1 must have sufficient rigidity and strength, as well as good wear resistance. When clamping part 4, the design accuracy of the mandrel 1 must be higher than the machining accuracy of part 4. Under the above two requirements, the mandrel 1 is designed with center holes A1.5-GB / T145-2001 at both ends. The mandrel 1 is made of easy-to-quench high-strength steel, which is wear-resistant. When machining the mandrel 1, the outer circle of the mandrel 1 and the hole is ground concentrically by the center holes at both ends of the mandrel 1 to ensure that the center hole and the outer circle of the mandrel 1 are coaxial, which can also improve the quality of clamping part 4 with the mandrel 1.
[0021] In use, the mandrel 1 of the clamping fixture is inserted into the φ13H7 hole of part 4. The end of the stud 105 of the mandrel 1 protrudes and is exposed outside part 4. The shaft body 104 is fitted into the central elongated hole of part 4. The limiting block 103 abuts against the inner wall of the bottom of the opening groove of part 4. The main body of the transition body 102 is fitted into the opening groove of part 4, and one end of the transition body 102 protrudes from the opening groove of part 4. Then, the end face perpendicular to the inner hole φ13H7 of part 4 is used as a limit. After clamping part 4 in place, the washer 2 is inserted into the stud 105 of the mandrel 1 to press down this end of part 4. Finally, the nut 3 is screwed onto the stud 105 of the mandrel 1 through the thread. The nut 3 presses the washer 2 to fix part 4. Then, the fixture is tightened by the lathe three-jaw chuck and the tailstock center of the lathe. Rotating the fixture drives the part 4 to rotate, and the outer shape can be machined.
Claims
1. A clamping fixture for machining the outer diameter of shafts, characterized in that: The device includes a spindle (1), a washer (2), and a nut (3). The spindle (1) includes a shaft head (101), a transition body (102), a limiting block (103), a shaft body (104), and a stud (105). A convex-shaped transition body (102) is provided on one side of the shaft head (101), and a flat cylindrical limiting block (103) is provided on the other side of the transition body (102). A cylindrical shaft body (104) is provided on the other side of the limiting block (103), and a stud (105) is provided at the other end of the shaft body (104). After the washer (2) passes through the stud (105), the nut (3) is threadedly connected to the stud (105).
2. The shaft-type outer diameter machining clamping fixture according to claim 1, characterized in that: The shaft head (101), transition body (102), limiting block (103), shaft body (104) and stud (105) are an integral structure. The center of the shaft head (101), the center of the transition body (102), the center of the limiting block (103), the center of the shaft body (104) and the center of the stud (105) are all on the same axis.
3. The shaft-type outer diameter machining clamping fixture according to claim 1, characterized in that: The mandrel (1) has central holes A1.5-GB / T145-2001 at both ends.