Energy storage spot welding method for step honeycomb with shielding structure at welding part

Abstract

The invention provides an energy storage spot welding method for a step honeycomb with a shielding structure at a welding part. According to the technical scheme, the energy storage spot welding method comprises the following steps: step 1, dividing a welding spot area on a to-be-spot-welded surface of the honeycomb; 2, designing a positive electrode; and 3, designing a negative electrode holder according to the size of the outer surface of the shell part, so that the current flows out from the shortest path in a concentrated manner. And 4, the number N of welding spots in each spot welding area is determined. And fifthly, spot welding voltage is adjusted, and test welding is conducted on the surface. And sixthly, the honeycomb is assembled to the shell part. And 7, corresponding positive electrodes are replaced in sequence, and energy storage spot welding is completed. The method has the advantages that the spot welding quality of the step honeycomb is improved, the honeycomb positioning strength meets the subsequent vacuum brazing welding requirement, the part welding qualification rate is increased, part reworking or scrapping is avoided, the machining cost is saved, the good earnings and effects are achieved, and the economic benefits are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding of aero-engine parts, and particularly to an energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part. Background Art

[0002] Honeycomb structure parts are common parts in aero-engines, which play a role in gas sealing. They are generally welded to the inner or outer ring of the casing by vacuum brazing. The welding process mainly includes positioning welding, coating, vacuum brazing, etc.

[0003] Positioning welding is an important preparatory process before vacuum brazing. Usually, energy storage spot welding is used to form solder joints between the welding surfaces of the honeycomb part and the shell part, which plays a role in ensuring the welding dimensions of the parts. The strength of the solder joints has a great impact on the final brazing quality of the parts.

[0004] The common honeycomb welding structure is a regular circular honeycomb welded on a cylindrical surface. However, with the gradual improvement of engine performance requirements and the continuous optimization of the structure, some more complex special-shaped honeycomb welded parts have gradually emerged. Conventional spot welding positioning methods are difficult to meet the welding requirements. In actual processing, the strength of the positioning solder joints is insufficient, and the position and dimensional relationship between the honeycomb and the shell part cannot be stably maintained, resulting in unqualified parts after brazing. There is an urgent need to improve the strength of the solder joints and the welding quality of the parts. Summary of the Invention

[0005] The purpose of the present invention is to achieve reliable positioning of the stepped honeycomb on the stepped surface of the shell part, with firm solder joints, and to meet the requirements of honeycomb furnace brazing. An energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part is provided.

[0006] An energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part, the technical solution thereof includes:

[0007] Step 1: Divide the solder joint area on the surface of the honeycomb to be spot welded. Along the width L direction of the honeycomb, from the thick step end to the other end, divide it into sections with a width of 5 mm or 6 mm each, and divide a1, a2... a c A total of c a-zone spot welding areas, and the remaining area with a width less than 5 mm at the thin step end is defined as the b-zone, and the width needs to satisfy b≥3 mm or b = 0, where L is the total width of the honeycomb. As shown in the appendix Figure 1 shown.

[0008] Step 2: Design the positive electrode of the electrode according to the size of the assembly part of the honeycomb, as shown in the appendix Figure 3 shown, and the position of the spot welding area divided in Step 1. The number of electrodes is c + 1, and the shape is "L" shaped. It is formed by bending and machining a copper bar, and corresponds to each spot welding area respectively. The characteristic dimensions of the electrode are as shown in the appendixFigure 2 As shown in the figure, select according to the following principles:

[0009] ① d = (8 - 12) mm;

[0010] ② h = (240 - 280) mm;

[0011] ③ g = (1.3 - 1.5)p + u, where p is the distance between the inner surface of the honeycomb and the blocked part, and u is the thickness of the blocked part;

[0012] ④ The spot - welding area b corresponds to the electrode q b = (r + 2) mm; The spot - welding a n area corresponds to the electrode r is the distance between the end face of the honeycomb and the end face of the blocked part;

[0013] ⑤ e = (1 - 1.2) mm;

[0014] ⑥ f = (1 - 1.2) mm;

[0015] ⑦ The spot - welding area b corresponds to the electrode k b = (0.9 - 1)b; The spot - welding a n area corresponds to the electrode k n = (0.9 - 1)a n , 1 ≤ n ≤ c;

[0016] ⑧ j = (0.6 - 0.7)d.

[0017] Step 3: Design the negative electrode seat according to the outer surface dimensions of the housing part. The electrode seat is made of copper material and is generally in the shape of a "convex". As shown in the appendix Figure 4 As shown, the middle convex point faces the contact point between the positive electrode and the honeycomb. As shown in the appendix Figure 5 so that the current flows out concentratedly along the shortest path. Support blocks for support are arranged on both sides of the convex point. The support blocks are made of resin material with holes in the middle and are connected to the electrode seat by screws. The dimensions of each part of the electrode seat are determined according to the following principles:

[0018] ① R1 = 0.5D K , D K is the diameter of the housing surface closest to the honeycomb in the diameter direction;

[0019] ② R2 = (R1 + 10) mm;

[0020] ③ E = max(1.7H, 40 mm), where H is the distance between the surface with the maximum diameter of the housing and the surface with diameter D K surface distance;

[0021] ④ B = (0.2 - 0.25)E;

[0022] ⑤Q = (0.6 - 0.7)R1

[0023] ⑥W = (0.6 - 0.8)T, where T is the width of the shell surface closest to the honeycomb in the diameter direction;

[0024] ⑦Z = (15 - 25)mm;

[0025] ⑧S = (0.8 - 0.9)Z;

[0026] ⑨Y = (3 - 5)W;

[0027] ⑩X = (1.2 - 1.5)Q.

[0028] Step Four: Determine the number of solder joints N in each solder joint area according to the formula N = [πD F / (1.2d)], where D F is the inner surface diameter of the honeycomb and d is the electrode diameter. One circle of N solder joints is evenly distributed along the circumferential direction in each solder joint area.

[0029] Step Five: Clean the part surface and assemble the honeycomb onto the shell part.

[0030] Step Six: Adjust the spot welding voltage within the range of 200V - 260V and conduct a trial weld on the surface. Obvious sparks should appear at the weld seam during spot welding.

[0031] Step Seven: According to the solder joint areas divided in Step One and the number of solder joints determined in Step Four, sequentially replace the corresponding positive electrodes in the order from area b to area a to complete energy storage spot welding.

[0032] The present invention has the following beneficial effects:

[0033] The present invention provides an energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part, effectively improving the spot welding quality of the stepped honeycomb, enabling the honeycomb positioning strength to meet the subsequent vacuum brazing welding requirements, increasing the welding qualification rate of the parts, avoiding rework or scrapping of the parts, saving processing costs, achieving good revenue effects, and with the popularization and application of this technology, the economic benefits will be greatly improved. Description of the Drawings

[0034] Figure 1 It is a honeycomb structure and solder joint area diagram;

[0035] Figure 2 It is an electrode positive diagram;

[0036] Figure 3 It is a shell - honeycomb assembly diagram;

[0037] Figure 4 It is a negative electrode seat diagram;

[0038] Figure 5 This is a working position diagram of a spot welding electrode. Specific implementation mode

[0039] The present invention will be further explained below in combination with specific implementation schemes, but the present invention is not limited thereto. The structures, ratios, sizes, etc. shown in the attached drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0040] A stepped honeycomb energy storage spot welding method for the inner ring part of the guide vane of a certain aeroengine:

[0041] There is an occlusion structure above the honeycomb welding part of this part. The honeycomb width dimension L = 14 mm, the inner diameter D F = 550 mm, the distance p between the inner surface of the honeycomb and the occlusion part is 20 mm, the thickness u of the occlusion part is 4 mm, the distance r between the end face of the honeycomb and the end face of the occlusion part is 14 mm, the diameter D of the shell surface closest to the honeycomb in the diameter direction K = 600 mm, the distance H between the maximum diameter surface of the shell and the D K surface is 20 mm, and the width T of the shell surface closest to the honeycomb in the diameter direction is 18 mm.

[0042] The specific energy storage spot welding method is as follows:

[0043] Step 1: Divide the welding spot area on the surface of the honeycomb to be spot welded. Along the honeycomb width L direction, from the thick step end to the other end, divide it into a total of 2 a - area spot welding areas a1 and a2 in sections of 5 mm width each. The remaining area with a width less than 5 mm at the thin step end is defined as the b - area, and the width b = 14 - (5 + 5) = 4 mm.

[0044] Step 2: Design the positive electrode of the electrode according to the size of the occlusion part and the position of the spot welding area divided in Step 1. The number of electrodes is 3, and the shape is "L" - shaped. It is formed by bending and machining a copper bar stock and corresponds to each spot welding area respectively. The characteristic dimensions of the electrode are:

[0045] ① d = 10 mm;

[0046] ② h = 260 mm;

[0047] ③ g = 1.4p + u = 1.4 * 20 + 4 = 32 mm;

[0048] ④ The electrode q corresponds to the spot welding area b b=(r + 2)=14 + 2 = 16 mm; The electrode corresponding to the spot welding area a1

[0049] ⑤ e = 1 mm;

[0050] ⑥ f = 1 mm;

[0051] ⑦ The electrode corresponding to the spot welding area b is k b = b = 4 mm; The electrode corresponding to the spot welding area a1 is k1 = a1 = 5 mm, and the electrode corresponding to the spot welding area a2 is k2 = a2 = 5 mm;

[0052] ⑧ j = 0.6d = 0.6 * 10 = 6 mm.

[0053] Step 3: Design the negative electrode seat according to the outer surface dimensions of the housing part. The electrode seat is made of copper material and is generally similar to a "convex" shape. The convex point in the middle faces the contact point between the positive electrode and the honeycomb, so that the current flows out concentratedly along the shortest path. Support blocks for support are arranged on both sides of the convex point. The support blocks are made of resin material with holes in the middle and are connected to the electrode seat by screws. The dimensions of each part of the electrode seat are:

[0054] ① R1 = 0.5D K = 0.5 * 600 = 300 mm;

[0055] ② R2 = (R1 + 10)=300 + 10 = 310 mm;

[0056] ③ E = max(1.7H, 40 mm)=max(1.7 * 20 mm, 40 mm)=40 mm;

[0057] ④ B = 0.25E = 0.25 * 40 = 10 mm;

[0058] ⑤ Q = 0.6R1 = 0.6 * 300 = 180 mm;

[0059] ⑥ W = 0.6T = 0.6 * 18 = 10.8 mm,;

[0060] ⑦ Z = 20 mm;

[0061] ⑧ S = 0.9Z = 0.9 * 20 = 18 mm;

[0062] ⑨ Y = 3W = 3 * 10.8 = 32.4 mm;

[0063] ⑩ X = 1.2Q = 1.2 * 180 = 216 mm.

[0064] Step 4: Determine the number of solder joints in each spot welding area according to the formula N = [πD F / (1.2d)] A total of 144 welding points are evenly distributed in one circle along the circumferential direction of each spot welding area.

[0065] Step Five: Clean the surface of the part and assemble the honeycomb onto the housing part.

[0066] Step Six: Adjust the spot welding voltage within the range of 200V - 260V and conduct a trial weld on the surface. Obvious sparks should appear at the weld during spot welding.

[0067] Step Seven: According to the spot welding areas divided in Step One and the number of welding points determined in Step Four, sequentially replace the corresponding positive electrodes in the order from area b to area a to complete energy storage spot welding.

[0068] Matters not covered by this invention are well-known technologies.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part, characterized in that: The energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part includes: Step 1: Divide the welding spot areas on the surface of the honeycomb to be spot-welded. Along the honeycomb width L direction, starting from the thick step end to the other end, divide it into sections with a width of every 5 mm or 6 mm, and label them as a1, a2... a c There are a total of c a-area spot-welding areas. The area with a width less than 5 mm remaining at the thin step end is defined as the b area, and the width needs to satisfy b≥3 mm or b = 0, where L is the total width of the honeycomb; Step 2: Design the positive electrode according to the size of the honeycomb assembly part and the position of the spot welding area divided in Step 1. The number of electrodes is c + 1, and the shape is "L". It is formed by bending and machining a copper bar, corresponding to each spot welding area respectively. Step 3: Design the negative electrode seat according to the outer surface size of the shell part. The electrode seat is made of copper material and is generally similar to a "convex" shape. The middle convex point faces the contact point between the positive electrode and the honeycomb, so that the current flows out concentratedly along the shortest path. Support blocks for support are arranged on both sides of the convex point. The support blocks are made of resin material with holes in the middle and are connected to the electrode seat by screws. Step 4: Determine the number of welding spots N in each spot welding area according to the formula N = [πD F / (1.2d)], where D F is the diameter of the inner surface of the honeycomb and d is the diameter of the electrode; one circle of N welding spots is evenly distributed along the circumferential direction in each spot welding area; Step 5: Clean the surface of the part and assemble the honeycomb onto the shell part. Step 6: Adjust the spot welding voltage within the range of 200V - 260V and conduct a trial weld on the surface. Obvious sparks should appear at the weld during spot welding. Step 7: According to the spot welding areas divided in Step 1 and the number of weld spots determined in Step 4, replace the corresponding positive electrodes in sequence from area b to area a to complete the energy storage spot welding.

2. The energy storage spot welding method for a stepped honeycomb with an occlusion structure at the welding part according to claim 1, wherein: In the said Step 2, the characteristic dimensions of the electrode are selected according to the following principles: ① d = (8 - 12)mm; ② h = (240 - 280)mm; ③ g = (1.3 - 1.5)p + u, where p is the distance between the inner surface of the honeycomb and the occlusion part, and u is the thickness of the occlusion part; ④ The spot welding area b corresponds to the electrode q b =(r + 2) mm; Spot welding a n The area corresponds to the electrode 1 ≤ n ≤ c, where r is the distance between the honeycomb end face and the end face of the shielding part; ⑤ e = (1 - 1.2)mm; ⑥ f = (1 - 1.2)mm; ⑦The spot welding area b corresponds to the electrode k b =(0.9 - 1)b; spot welding a n The area corresponds to the electrode k n =(0.9 - 1)a n , 1 ≤ n ≤ c; ⑧ j = (0.6 - 0.7)d.

3. The energy storage spot welding method for stepped honeycombs with an occlusion structure at the welding part according to claim 1, characterized in that: In the said Step 3, the dimensions of each part of the electrode seat are determined according to the following principles: ①R1 = 0.5D K , D K is the diameter of the shell surface closest to the honeycomb in the diameter direction; ② R2 = (R1 + 10)mm; ③E = max(1.7H, 40 mm), where H is the distance between the surface of the maximum diameter of the housing and the diameter D K surface distance; ④ B = (0.2 - 0.25)E; ⑤ Q = (0.6 - 0.7)R1 ⑥ W = (0.6 - 0.8)T, where T is the width of the shell surface closest to the honeycomb in the diameter direction; ⑦ Z = (15 - 25)mm; ⑧ S = (0.8 - 0.9)Z; ⑨ Y = (3 - 5)W; ⑩ X = (1.2 - 1.5)Q.

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