Anti-deformation method for large-notch part

Abstract

The invention relates to an anti-deformation method for a part with a large opening, which belongs to the technical field of aero-engines, and specifically comprises the following steps: step 1, turning process edges: reserving the process edges on two end surfaces of the part, and enabling the process edges to be whole ring process edges; 2, groove milling is conducted, specifically, a notch is milled, the notch part is not milled through, and a process edge part is reserved; step 3, drilling side surface holes; step 4, finish turning a notch-free end surface; and 5, cutting off the process edge: selecting a linear cutting machining mode to cut off the process edge at the notch part, and removing a linear cutting remelting layer by adopting a polishing method. The machining deformation control method is suitable for parts with large-opening structures, machining deformation of the parts with the large openings is controlled, the parts can be machined to be qualified at a time, and it is guaranteed that the parts are qualified and delivered; the product quality is ensured and the application prospect is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of aeroengines, and in particular relates to a method for preventing deformation of large-notch parts. Background Art

[0002] In aircraft engines, the difficulty of machining parts with large notches lies in clamping and deformation control. The depth of a large notch is usually greater than 1 / 2 of the length of the part in that direction. For example, the mounting edge of a cone is made of high-temperature alloy material, and there are 16 large notches on one side of the end face of the part. The thinnest wall thickness of the part is 1.7, and the maximum diameter is ф246. Figure 1-2 As shown in the figure, the clamping and deformation control of such thin-walled, large-diameter and large-notch parts are difficult problems in the processing of such parts. The traditional processing method is to first mill the notch, and then complete the final processing of the part by intermittent turning or milling. This method causes serious wear of the part tool, large and irregular deformation of the part notch, and the irregular deformation problem of the part after notch processing cannot be controlled. The part size and technical requirements cannot be guaranteed, and fixture support is required, which is costly. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for controlling the machining deformation of large notch parts to ensure qualified delivery of parts.

[0004] A method for preventing deformation of large notch parts, comprising the following steps:

[0005] Step 1: machining a process edge: the process edge is a full-ring process edge;

[0006] Step 2: Milling groove;

[0007] Step 3: Drill side holes:

[0008] Step 4: Finish turning the end face without notches;

[0009] Step 5: Cut off the craft edges.

[0010] In the first step, process edges are reserved on both end faces of the part.

[0011] The second step is milling the notch.

[0012] In the step 2, the notch portion is not milled through, and the process edge portion is retained.

[0013] In the step 5, a wire cutting processing method is selected to cut off the process edge of the notch, and a grinding method is adopted to remove the wire cutting remelted layer.

[0014] The beneficial effects of the present invention are as follows: the present invention sets an annular process edge on both end faces of the part, provides a reliable clamping positioning reference and can provide support positioning before the notch is cut, meeting the needs of subsequent processing. The present invention is suitable for parts with large notch structures, controls the processing deformation of large notch parts, can achieve one-time qualified processing of parts, ensure qualified delivery of parts, ensure product quality, and have broad application prospects. At present, it has been applied to the installation edge parts of high-temperature alloy cones cast in a certain type of aircraft engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a thin-walled, large-diameter part with a large notch;

[0016] Figure 2 for Figure 1 Half-section of

[0017] Figure 3 It is a schematic diagram of step 1 of the present invention;

[0018] Figure 4 It is a schematic diagram of step 2 of the present invention;

[0019] Figure 5 for Figure 4 Schematic diagram of P;

[0020] Figure 6 It is a schematic diagram of step three of the present invention;

[0021] Figure 7 It is a schematic diagram of step 4 of the present invention;

[0022] Figure 8 It is a schematic diagram of step five of the present invention. DETAILED DESCRIPTION

[0023] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0024] A method for preventing deformation of large notch parts, comprising the following steps:

[0025] Step 1: Turn the process edge.

[0026] According to the structural characteristics of the parts, the clamping and positioning scheme is determined, that is, the process edges are reserved at both ends of the parts, and the process edges are full-ring process edges. After the parts have full-ring process edges, the assembly becomes simple, and no auxiliary support is required. Simple and universal support clamping fixtures can realize part processing. The process edges are clamped and positioned by the support clamping fixture, and the parts are processed by clamping, which reduces the deformation of the parts during clamping. Figure 3 At the same time, the inner and outer surfaces of the milling notch are processed in place.

[0027] Step 2: Milling grooves.

[0028] Milling notch. The notch is not milled through, and the process edge is retained. This way, there is a complete clamping edge, and the influence of milling deformation of parts on subsequent processing is avoided, which stabilizes the state of the parts. Figure 4-5 shown.

[0029] Step 3: Drill the side holes.

[0030] Drill holes on the side of the part. Figure 6 shown.

[0031] Step 4: Finish turning the end face without notch; Figure 7 shown.

[0032] Step 5: Cut off the craft edges.

[0033] Choose wire cutting to cut off the process edge of the notch, and use grinding to remove the wire cutting remelting layer to avoid the impact of the cutting force of the machined intermittent cutting method on the parts. Figure 8 shown.

[0034] During the entire process, due to the setting of process edges, the designed axial dimensions of the parts must be processed to the final state with the process edges, so they cannot be guaranteed directly and need to be indirectly guaranteed through dimension chain calculation.

Claims

1. A method for preventing deformation of large notch parts, characterized in that: The specific steps include: Step 1: machining a process edge: the process edge is a full-ring process edge; Step 2: Milling groove; Step 3: Drill side holes: Step 4: Finish turning the end face without notches; Step 5: Cut off the craft edges.

2. A method for preventing deformation of large notch parts according to claim 1, characterized in that: In the first step, process edges are reserved on both end faces of the part.

3. A method for preventing deformation of large notch parts according to claim 1, characterized in that: The second step is milling the notch.

4. A method for preventing deformation of large notch parts according to claim 3, characterized in that: In the step 2, the notch portion is not milled through, and the process edge portion is retained.

5. A method for preventing deformation of large notch parts according to claim 1, characterized in that: In the step 5, a wire cutting processing method is selected to cut off the process edge of the notch, and a grinding method is adopted to remove the wire cutting remelted layer.

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