Blisk linear friction welding head profile contour design method

Abstract

The invention relates to a blisk linear friction welding head profile contour design method. The method comprises the steps that a welding section S0, a blade maximum height section S1 covered by a welding structure and a blade minimum height section S2 covered by the welding structure are determined on a blisk blade model; contours formed by intersecting lines of the sections S0, S1 and S2 and the blade entity are marked as blade-shaped curves f0, f1 and f2; the f1 and the f2 are projected on the welding section S0 in the normal direction of the welding section S0, and leaf-shaped curves f1'and f2 'are obtained; a spline envelope curve is made on the common area of f1 ', f2' and f0, a welding face formed by the envelope curve F is the standard welding section of the section S0, the standard welding section serves as a reference face, the section S1 and the section S2 are stretched into a body V1 and a body V2, and the body V1 and the body V2 are the optimized welding joint structure. All the blades of the blisk can be welded at a time, and the welding production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a method for designing a profile of a linear friction welding head of an integral blade disk. Background Art

[0002] Linear friction welding technology is a key manufacturing technology for integral blade disk parts. In the field of product manufacturing, production efficiency is an important indicator to measure whether a technology can be applied in engineering. Since integral blade disk parts have complex spatial curved surface structures and the space size between adjacent blades is limited, conventional welding structures cannot meet the spatial size requirements of integral blade disks and cannot continuously weld adjacent blades, which reduces welding manufacturing efficiency and increases manufacturing cycle.

[0003] A Chinese patent (publication number: CN109175673A, publication date: January 11, 2019) discloses a blade linear friction welding joint quality control method and device, which overcomes the problem that traditional rectangular and diamond-shaped cross-sections are prone to unwelded defects at the corners. It effectively reduces the welding area of ​​the component and ensures the quality of the welded joint, and greatly reduces the waste of precious metals. However, this technical solution has the problem of too large a design error range and too many subjective design factors, which can easily lead to an excessively large welding cross-sectional area or insufficient key dimensions, and there is a problem of misprocessing the blade profile after welding.

[0004] Therefore, for integral blade-type engineering application products, there is still no standard design method for linear friction welding structures. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for designing the profile of the linear friction welding head of an integral blade disk, formulates standard steps for designing the cross-sectional shape of the linear friction welding, has good design repeatability, high material utilization rate, and saves welding structure space, so that all blades of the integral blade disk can complete the welding process at one time, thereby improving welding production efficiency.

[0006] A method for designing a profile of a linear friction welding joint of an integral blade disk comprises the following steps:

[0007] Step 1:

[0008] Three characteristic sections are determined on the integral blade disk model, namely: welding section S0, section S1 with the maximum height of the blade covered by the welding structure, and section S2 with the minimum height of the blade covered by the welding structure. The three characteristic sections are parallel to each other.

[0009] Step 2:

[0010] The contours formed by the intersection lines of the sections S0, S1, S2 and the blade entity are marked as the leaf shape curve f0, the leaf shape curve f1, and the leaf shape curve f2 respectively;

[0011] Step 3:

[0012] Project the lobe curve f1 and the lobe curve f2 on the welding section S0 along the normal direction of the welding section S0 to obtain the lobe curve f1' and the lobe curve f2'; mark the common area of ​​the lobe curve f1', the lobe curve f2' and the lobe curve f0 on the section S0 as the effective welding area;

[0013] Step 4:

[0014] Make a spline envelope curve F around the common area determined in step 3 on the welding section S0; the welding surface formed by the envelope curve F thus obtained is the standard welding section of the section S0;

[0015] Step 5:

[0016] Taking the standard welding section as the reference plane, the sections S1 and S2 are stretched into bodies V1 and V2 respectively. Bodies V1 and V2 are the optimized welding joint structures to obtain the profile of the linear friction welding joint of the integral blade.

[0017] In the step 4, tangent lines are drawn at both ends of the envelope curve F, and chamfering is performed at the intersection.

[0018] The beneficial effects of the present invention are:

[0019] Compared with the traditional integral blade disc linear friction welding method, the present invention optimizes the linear friction welding structure of the integral blade disc parts to make the welding structure compact, reasonable, more standardized and simple. It avoids the problem of excessive ineffective materials and interference between adjacent blades during welding, which leads to low production efficiency. This method can complete the welding of all blades of the integral blade disc in one clamping, which can significantly shorten the welding cycle and greatly improve the welding efficiency of linear friction welded integral blade disc parts. At the same time, it solves the problem of incomplete envelope blade shape in the traditional linear friction welded integral blade disc welding structure, which leads to misprocessing of blades after welding and overcutting damage of blades, making the design method of the integral blade disc welding structure more standardized.

[0020] The invention can be used for linear friction welding production of large integral blade disk parts of aircraft engines and has good engineering application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three cross sections of the blade of the present invention;

[0022] Figure 2 It is a schematic diagram of the welding surface F on the cross section S0 of the present invention;

[0023] Figure 3 This is the optimized welding joint structure of the present invention. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1

[0026] Combination Figure 1-3 As shown, the present embodiment provides a method for designing a profile of a linear friction welding joint of an integral blade disk, comprising the following steps:

[0027] Step 1:

[0028] Firstly, three characteristic sections are determined on the integral blisk blade model, namely: section S0 at a height of 20 mm from the flow path surface, section S1 at a height of 30 mm from the flow path surface, and section S2 at a height of 10 mm from the flow path surface. Section S0 is the welding section, section S1 is the section with the maximum height of the blade covered by the welding structure, and section S2 is the section with the minimum height of the blade covered by the welding structure. The three characteristic sections are parallel to each other.

[0029] Step 2:

[0030] The contours formed by the intersection lines of the sections S0, S1, S2 and the blade entity are marked as leaf shape curve f0, leaf shape curve f1, and leaf shape curve f2, respectively.

[0031] Step 3:

[0032] The lobe curve f1 and the lobe curve f2 are projected on the section S0 along the normal direction of the section S0 to obtain the lobe curve f1' and the lobe curve f2'. The common area of ​​the lobe curve f1', the lobe curve f2' and the lobe curve f0 marked on the section S0 is the effective welding area.

[0033] Step 4:

[0034] Draw a spline envelope curve F around the common area determined in step 3 on section S0. Draw tangent lines at both ends of the envelope curve F and chamfer the intersection. The welding surface formed by the envelope curve F thus obtained is the standard welding section of section S0.

[0035] Step 5:

[0036] Taking the standard welding section as the reference plane, the sections S1 and S2 are stretched into body V1 and body V2 respectively. Body V1 and body V2 are the optimized welding joint structures to obtain the profile of the linear friction welding joint of the integral blade.

[0037] Example 2

[0038] The present embodiment provides a method for designing a profile of a linear friction welding joint of an integral blade disk, comprising the following steps:

[0039] Step 1:

[0040] Firstly, three characteristic sections are determined on the integral blisk blade model, namely: section S0 at a height of 25 mm from the flow path surface, section S1 at a height of 35 mm from the flow path surface, and section S2 at a height of 15 mm from the flow path surface. Section S0 is the welding section, section S1 is the section with the maximum height of the blade covered by the welding structure, and section S2 is the section with the minimum height of the blade covered by the welding structure. The three characteristic sections are parallel to each other.

[0041] Step 2:

[0042] The contours formed by the intersection lines of the sections S0, S1, S2 and the blade entity are marked as leaf shape curves f0, f1, and f2, respectively.

[0043] Step 3:

[0044] The lobe curve f1 and the lobe curve f2 are projected on the section S0 along the normal direction of the section S0 to obtain the lobe curve f1' and the lobe curve f2'. The common area of ​​the lobe curve f1', the lobe curve f2' and the lobe curve f0 marked on the section S0 is the effective welding area.

[0045] Step 4:

[0046] Draw a spline envelope curve F around the common area determined in step 3 on section S0. Draw tangent lines at both ends of the envelope curve F and chamfer the intersection. The welding surface formed by the envelope curve F thus obtained is the standard welding section of section S0.

[0047] Step 5:

[0048] Taking the standard welding section as the reference plane, the sections S1 and S2 are stretched into body V1 and body V2 respectively. Body V1 and body V2 are the optimized welding joint structures to obtain the profile of the linear friction welding joint of the integral blade.

Claims

1. A method for designing the profile of a linear friction welding joint of an integral blade disk, characterized in that: The following steps are involved: Step 1: Three characteristic sections are determined on the integral blade disk model, namely: welding section S0, section S1 with the maximum height of the blade covered by the welding structure, and section S2 with the minimum height of the blade covered by the welding structure. The three characteristic sections are parallel to each other. Step 2: The contours formed by the intersection lines of the sections S0, S1, S2 and the blade entity are marked as the leaf shape curve f0, the leaf shape curve f1, and the leaf shape curve f2 respectively; Step 3: Project the lobe curve f1 and the lobe curve f2 on the welding section S0 along the normal direction of the welding section S0 to obtain the lobe curve f1' and the lobe curve f2'; mark the common area of ​​the lobe curve f1', the lobe curve f2' and the lobe curve f0 on the section S0 as the effective welding area; Step 4: Make a spline envelope curve F around the common area determined in step 3 on the welding section S0; the welding surface formed by the envelope curve F thus obtained is the standard welding section of section S0; Step 5: Taking the standard welding section as the reference plane, the sections S1 and S2 are stretched into bodies V1 and V2 respectively. Bodies V1 and V2 are the optimized welding joint structures to obtain the profile of the linear friction welding joint of the integral blade.

2. The method for designing the profile of a linear friction welding joint of an integral blade disk according to claim 1, characterized in that: In the step 4, tangent lines are drawn at both ends of the envelope curve F, and chamfering is performed at the intersection.

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