A method for preventing deformation of a large opening part

Abstract

The present application relates to a kind of big gap part anti-deformation method, belong to aero-engine technical field, specifically includes: step one: process edge is turned out: process edge is reserved in the both ends of part, the process edge is whole ring process edge;Step two: groove milling: gap is milled, gap site is not milled, and process edge site is reserved;Step three: drill side hole: step four: finish turning no gap end face;Step five: cutting process edge: the processing mode of line cutting is selected to cut off gap site process edge, and the method of polishing is removed line cutting remelt layer.The present application is applicable to the part of big gap structure, controls the machining deformation of big gap class part, can realize that part is machined qualified once, guarantees that part is qualified delivery;Ensure product quality, and application prospect is broad.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology, and in particular relates to a method for preventing deformation of parts with large notches. Background Technology

[0002] In aero-engines, the difficulty in machining parts with large notches lies in clamping and deformation control. Large notches are typically deeper than half the length of the part in that direction. For example, a cone-shaped mounting edge is made of a high-temperature alloy, and one end face of the part has 16 large notches. The thinnest part has a wall thickness of 1.7 mm, and the maximum diameter is ф246 mm. Fig. 1-2 As shown, clamping and deformation control of thin-walled, large-diameter parts with large notches are challenging aspects of machining such parts. Traditional machining methods involve first milling open the notch, followed by intermittent turning or milling to complete the final machining. This method results in severe tool wear, large and irregular deformation at the notch, and uncontrollable irregular deformation after notch machining, failing to guarantee part dimensions and technical requirements. Furthermore, it requires fixture support, leading to high costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for preventing deformation of large-notch parts, thereby controlling the deformation during the processing of large-notch parts and ensuring that the parts are delivered in good condition.

[0004] A method for preventing deformation of a large-notch part, wherein the large-notch part is a thin-walled part with a large diameter and multiple large notches, the notch depth being greater than 1 / 2 of the part's length in that direction, specifically including the following steps:

[0005] Step 1: Machining the process edge: The process edge is a complete ring process edge;

[0006] Step 2: Milling the groove;

[0007] Step 3: Drill side holes:

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

[0009] Step 5: Cut off the process edge.

[0010] In one step, process edges are reserved on both ends of the part.

[0011] Step two involves milling the notch.

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

[0013] In step five, wire cutting is selected to cut off the process edge of the notch, and grinding is used to remove the wire-cut remelted layer.

[0014] The beneficial effects of this invention are: It provides annular process edges on both ends of the part, offering a reliable clamping and positioning reference and providing support and positioning before the notch is cut, thus meeting subsequent processing needs. This invention is applicable to parts with large notch structures, controlling the deformation during processing of such parts, enabling one-time processing qualification, ensuring qualified delivery, guaranteeing product quality, and showing broad application prospects. Currently, it has been applied to the mounting edge type of high-temperature alloy cone-shaped parts cast for a certain type of aero-engine. Attached Figure Description

[0015] Fig. 1 A schematic diagram of a thin-walled, large-diameter part with a large notch;

[0016] Fig. 2 for Fig. 1 A half-section view;

[0017] Fig. 3 This is a schematic diagram of step one of the present invention;

[0018] Fig. 4 This is a schematic diagram of step two of the present invention;

[0019] Fig. 5 for Fig. 4 P-direction schematic diagram;

[0020] Fig. 6 This is a schematic diagram of step three of the present invention;

[0021] Fig. 7 This is a schematic diagram of step four of the present invention;

[0022] Fig. 8 This is a schematic diagram of step five of the present invention. Detailed Implementation

[0023] To better explain and facilitate understanding of the present invention, the technical solution and effects of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] A method for preventing deformation of parts with large notches includes the following steps:

[0025] Step 1: Machining the process edge.

[0026] Based on the structural characteristics of the part, a clamping and positioning scheme is determined, namely, reserving process edges on both end faces of the part, wherein the process edges are full-ring process edges. With full-ring process edges, clamping becomes simpler, eliminating the need for auxiliary supports; simple and universal support and clamping fixtures can be used to process the part. By clamping and positioning the process edges using the support and clamping fixtures, the part is processed using a clamping method, reducing clamping deformation. Fig. 3 As shown. At the same time, the inner and outer surfaces of the milled notch are machined to the required positions.

[0027] Step 2: Milling the groove.

[0028] Milling the notch. The notch is not milled through; the process edge is retained. This ensures a complete clamping edge while avoiding the impact of milling deformation on subsequent machining, thus stabilizing the part's condition. For example... Fig. 4-5 As shown.

[0029] Step 3: Drill side holes.

[0030] Drill holes on the side of the part. For example... Fig. 6 As shown.

[0031] Step 4: Finish machine the end face without notches; such as Fig. 7 As shown.

[0032] Step 5: Cut off the process edge.

[0033] Wire EDM is selected to cut off the process edge of the notch area, and the wire EDM remelted layer is removed by grinding to avoid the impact of the cutting force of intermittent machining on the part. Fig. 8 As shown.

[0034] Throughout the entire process, due to the presence of process edges, the axial dimensions of the parts must be machined to the final state while maintaining the process edges. Therefore, they cannot be directly guaranteed and need to be indirectly guaranteed through dimensional chain calculations.

Claims

1. A method for preventing deformation of parts with large notches, characterized in that, The large-notch part is a thin-walled, large-diameter part with multiple large notches, and the notch depth is greater than 1 / 2 of the part's length in that direction. Specifically, it includes the following steps: Step 1: Machining the process edge: The process edge is a complete ring process edge; Based on the structural characteristics of the part, the clamping and positioning scheme is determined as follows: process edges are reserved on both ends of the part, and the process edges are full-ring process edges; the process edges are clamped and positioned by a support clamping fixture to reduce part clamping deformation; the inner and outer surfaces of the milled notch are machined into place. Step 2: Milling the groove; When milling the notch, do not mill the entire notch; retain the process edge to avoid deformation of the part from milling and its impact on subsequent processing. Step 3: Drill side holes: Step 4: Finish machine the end face without any notches; Step 5: Trim the process edge; Wire EDM is selected to cut off the process edge of the notch area, and the wire EDM remelted layer is removed by grinding to avoid the impact of the cutting force of the intermittent cutting method on the part.

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