一种多孔槽薄壁框架铣镗夹具
By designing a milling and boring fixture for a thin-walled frame with multiple slots, and employing interference fit between the base and the positioning spline shaft, as well as spline major diameter fit, stable positioning and precise machining of the thin-walled frame are achieved. This solves the problems of deformation and vibration of the thin-walled frame during the slotting process, and improves machining accuracy and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGLU MACHINERY & ELECTRONICS GROUP
- Filing Date
- 2025-06-30
- Publication Date
- 2026-07-17
AI Technical Summary
The porous groove structure of thin-walled frames is complex and requires high precision, but it is prone to deformation and vibration during the milling process, making it difficult to meet design requirements.
A multi-grooved thin-walled frame milling and boring fixture is adopted, including a base, a positioning spline shaft and a reinforcing spoke plate. Stable positioning of the workpiece is achieved through interference fit and spline major diameter fit, and boring and slotting are performed by clamping parts and rotating indexing of the worktable.
It improves the positioning accuracy and processing stability of the workpiece, reduces deformation and vibration, ensures the processing accuracy, parallelism and perpendicularity of the groove, and extends the service life of the fixture.
Smart Images
Figure CN224509053U_ABST
Abstract
Claims
1. A multi-slot thin-walled frame milling and boring fixture, characterized by: The machine includes a base, a positioning spline shaft, and reinforcing spokes. The base is mounted on the machine tool's worktable. The upper part of the base has a protruding plane that serves as a positioning frustum. The center of the positioning frustum has a stepped hole for mounting the positioning spline shaft. The positioning spline shaft and the base are assembled with an interference fit. The positioning spline shaft and the workpiece have a spline major diameter fit to achieve workpiece positioning. The workpiece is clamped by a clamping component. The workpiece is driven to complete boring and milling of multiple side grooves by rotating and indexing the worktable.
2. The thin-walled frame with a multi-hole slot milled and bored fixture according to claim 1, characterized in that: The number of clamping components is four, which are distributed around the positioning truncated cone. The clamping components include reinforcing spokes, pads, bolts, and nuts. The bolts are installed on the base, and then the reinforcing spokes, pads, and nuts are installed in sequence and tightened.
3. The thin-walled frame with milled and bored holes fixture according to claim 1, characterized in that: The base is a square piece with two U-shaped grooves on each side to facilitate fixing the fixture to the machine tool's worktable. The width of the U-shaped grooves matches the T-shaped grooves of the worktable.
4. The thin-walled frame with milled and bored holes fixture according to claim 1, characterized in that: The size of the positioning frustum matches the outer diameter of the workpiece, the flatness of the positioning plane in contact with the workpiece is no greater than 0.012mm, and the parallelism of the upper and lower planes of the base is no greater than 0.015mm.
5. The thin-walled frame with milled and bored holes fixture according to claim 1, characterized in that: The diameter and length of the stepped hole are designed according to the size of the workpiece, with a gap of 3~5mm in both the axial and radial directions to ensure that the workpiece fits snugly against the base positioning surface; the perpendicularity of the positioning hole of the positioning spline shaft to the positioning plane is less than 0.02mm.
6. The thin-walled frame with milled and bored holes fixture according to claim 1, characterized in that: After the positioning spline shaft is assembled in the fixture, the perpendicularity of the positioning spline shaft on the major diameter positioning length is no greater than 0.01mm, the outer circle accuracy of the mating spline teeth is grade 6, and the surface roughness is no greater than Ra0.
8.
7. The thin-walled frame with milled and bored holes fixture according to claim 1, characterized in that: The clearance between the positioning spline shaft and the workpiece spline major diameter is 0.02~0.03mm, and the spline mating length is not less than 12mm.
8. The thin-walled frame with milled and bored holes fixture according to claim 2, characterized in that: The reinforcing spoke is a ring, the shape of which is adapted to the outer dimensions of the workpiece. Four through holes are evenly distributed on the ring, so that the bolts can be tightened through the spoke.