A machining tool for a part
By designing the positioning surface and positioning structure of the tooling fixture, the positioning and machining problems of irregular parts were solved, achieving high-precision and high-efficiency machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHAANXI AEROSPACE TIMES NAVIGATION EQUIP CO LTD
- Filing Date
- 2024-08-13
- Publication Date
- 2026-07-31
AI Technical Summary
Existing technologies struggle to effectively position and process irregularly shaped parts consisting of three rings, particularly in terms of ensuring processing accuracy and efficiency.
Design a tooling fixture comprising a first and second positioning surface that are perpendicular to each other. Utilize a positioning column, a pressure plate mechanism, and a positioning shaft to ensure that the positioning datum of the part remains unchanged. Through the cooperation of clamping and the positioning shaft, precise machining of the inner holes of the middle and two side annulus rings can be achieved.
It enables precise positioning and processing of irregularly shaped parts, improves processing accuracy and efficiency, and ensures the perpendicularity and coaxiality of the parts.
Smart Images
Figure CN118752275B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to tooling fixtures. Background Technology
[0002] To improve machining efficiency and accuracy, parts need to be positioned using tooling during machining. This is especially important for irregularly shaped parts, which require specially designed tooling structures to meet positioning needs. For example, a part composed of three rings arranged radially in sequence, where the axes of the two outer rings are parallel, and the axis of the middle ring is perpendicular to the axes of the outer rings, as shown in the attached figure. Figure 4 The part shown requires special tooling for positioning when machining the three inner holes of the rings to ensure machining accuracy. Summary of the Invention
[0003] In order to improve, such as Figure 4 The present invention provides a machining fixture to improve the machining accuracy of the part shown. The technical solution adopted by the present invention is as follows:
[0004] A tooling fixture for machining a part, the part being composed of three rings arranged in a radial direction, wherein the axes of the two outer rings are parallel and the axis of the middle ring is perpendicular to the axes of the two outer rings, the tooling including a first positioning surface and a second positioning surface that are perpendicular to each other.
[0005] A pair of positioning posts are provided on the first positioning surface, which allow the two side rings of the part to be positioned on it, and a pressure plate mechanism is provided to press the two side rings to keep the end faces of the two side rings close to the first positioning surface. The axes of the two positioning posts are coplanar and the plane in which they are located is parallel to the second positioning surface.
[0006] A pair of machining holes with a diameter larger than the inner diameter of the two rings on both sides of the part and smaller than the outer diameter are provided on the second positioning surface. The tooling is also provided with a positioning shaft that allows the middle ring of the part to be fitted on it. Fasteners for fixing the part are provided on the positioning shaft. After the middle ring of the part is fitted on the positioning shaft and fixed, the end faces of the two rings on both sides of the part are close to the second positioning surface, and the inner rings of the two rings on both sides of the part are concentric with the machining holes.
[0007] Furthermore, the pressure plate mechanism includes a pressure plate, bolts, a boss, and a washer. The washer can be inserted into the ring and covers the end face of the ring. The bolt drives one end of the pressure plate to press the washer tightly, and the boss provides support to the other end of the pressure plate.
[0008] Using the above-mentioned tooling structure, the inner holes of the middle ring and the inner holes of the two side rings can be machined separately without changing the positioning datum. The machining accuracy of the parts can be improved by controlling the accuracy of the positioning surface of the tooling fixture. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the tooling structure;
[0010] Figure 2 A diagram showing the assembly state of a part during the machining of the inner hole of the central annulus.
[0011] Figure 3 A diagram showing the assembly state of the part during the machining of the inner holes of the two circular rings on both sides of the part.
[0012] Figure 4 This is a schematic diagram of the clamping structure of the parts. Detailed Implementation
[0013] To provide a better understanding, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, such as... Figure 1 The fixture shown has two reference surfaces, namely a first positioning surface 1 and a second positioning surface 2. These two positioning surfaces are located on both sides of the fixture, and the first positioning surface 1 and the second positioning surface 2 are perpendicular to each other. A notch 11 is provided at the bottom of the fixture to facilitate the installation and fixing of the fixture to the worktable.
[0014] To achieve positioning and fixing of the part, a pair of positioning pins 3 are provided on the first positioning surface 1. When machining the inner hole of the middle ring a of the part, if... Figure 2 As shown, the two circular rings on both sides of the part are fitted onto the positioning post 3, and the two circular rings b on both sides of the part are pressed by the pressure plate mechanism so that the positioning reference c of the two circular rings is in close contact with the first positioning surface 1. Specifically, the pressure plate mechanism includes a pressure plate 6, a bolt 7, a boss 8, and a washer 9. The washer 9 is provided with a protrusion 9-1 that can be inserted into the inner cavity of the circular ring, and the washer can cover the circumference of the circular ring. The bolt 7 is connected to the first positioning surface 1. The pressure plate 6 presses the part by applying pressure through the bolt 7. When pressing, one end of the pressure plate 6 presses the washer 9, and the other end is supported by the boss 8 to ensure the balance of the pressing force. In addition, the washer 9 is also to provide a balanced pressing force on the part. The height of the positioning post 3 is less than the depth of the inner hole of the circular ring. The protrusion 9-1 of the washer 9 only ensures the installation of the washer 9. After the washer 9 is installed, there is a small gap between the protrusion 9-1 and the positioning post 3 so as not to affect the pressing effect of the washer 9. To ensure the machining accuracy of the inner hole of the central ring, the axes of the two positioning pins 3 are coplanar and their planes are parallel to the second positioning surface 2. After positioning by the positioning pins 3, the perpendicularity of the inner hole axis to the reference surface of the two side rings can be ensured when machining the inner hole of the central ring. When the outer ring of the central ring is higher than the thickness of the two side rings, a clearance groove 10 is also provided on the first positioning surface 1 to avoid interference during the installation of parts.
[0015] A pair of machining holes 4 are provided on the second positioning surface 2 of the tooling, and a positioning shaft 5 is also provided on the side of the tooling near the second positioning surface 2. When machining the inner cavities of the two annular rings on both sides of the part, such as Figure 3As shown, the middle ring of the part is fitted onto and locked onto the positioning shaft 5. In this embodiment, the positioning shaft 5 is a threaded rod, locked by a threaded connection using fasteners 12. The reference surfaces of the two side rings are flush with the second positioning surface 2, and the two side rings are aligned with the machining holes. Therefore, it can be seen that the vertical height of the axis of the positioning shaft 5 from the second positioning surface 2 is determined by the distance from the center of the central ring to the orthographic projection distance of the reference surfaces of the two side rings. To facilitate the machining of the two side rings by the tool and to provide support for the rings, the inner diameter of the machining hole 4 is larger than the inner diameter of the ring but smaller than the outer diameter of the ring. Similarly, a clearance groove 10 is also provided on the second positioning surface 2 to prevent the middle ring from interfering with the installation of the part.
[0016] As can be seen from the above structure and positioning method, the positioning reference of the part remains unchanged. It is positioned by the same end face of the two rings. Under the premise of ensuring the perpendicularity of the two positioning surfaces, the perpendicularity of the two rings and the axis of the middle ring can be guaranteed.
Claims
1. A tooling for machining a part, the part being composed of three rings arranged in a radial sequence, the axis of the two side rings being parallel and the axis of the middle ring being perpendicular to the axis of the two side rings, characterized in that: The tooling includes a first positioning surface (1) and a second positioning surface (2) that are perpendicular to each other; On the first positioning surface (1), there is a pair of positioning posts (3) that allow the two side rings of the part to be positioned on it, and a pressure plate mechanism that presses the two side rings to keep the end faces of the two side rings close to the first positioning surface (1). The axes of the two positioning posts (3) are coplanar and the plane they are in is parallel to the second positioning surface. A pair of machining holes (4) with a diameter larger than the inner diameter of the two rings on both sides of the part and smaller than the outer diameter are provided on the second positioning surface (2). The tooling is also provided with a positioning shaft (5) that allows the middle ring of the part to be fitted on it. Fasteners (12) for fixing the part are provided on the positioning shaft (5). When the middle ring of the part is fitted onto the positioning shaft (5) and fixed, the end faces of the two rings on both sides of the part are close to the second positioning surface (2), and the inner rings of the two rings on both sides of the part are concentric with the machining holes (4).
2. The tooling fixture of claim 1, wherein: The pressure plate mechanism includes a pressure plate (6), a bolt (7), a boss (8), and a washer (9). The washer (9) can be inserted into the ring and covers the end face of the ring. The bolt (7) drives one end of the pressure plate (6) to press the washer (9), and the boss (8) provides support to the other end of the pressure plate (6).