Method and tool for improving intermittent welding quality of inner cone of front section of rotary body

Abstract

The invention relates to a method and tool for improving the intermittent welding quality of a front section inner cone of a rotary body, and belongs to the technical field of aero-engines, and the method specifically comprises the steps that according to the structure of the front section inner cone, a welding process edge structure is machined at the intermittent notch position of the front section of the inner cone; assembling the front section of the inner cone processed with the welding process edge structure; inserting the inner layer of the front edge of the inner cone and the welding process edge structure, and performing assembly positioned welding; the front section of the inner cone is pressed inwards from the outside by adopting a pressing ring; and the inner cone front section and the inner cone front edge inner layer are subjected to whole-circle welding. Wherein when the inner cone front section provided with the welding process edge structure is assembled, the mode that the inner cone front section expands outwards from the interior of the inner cone front section is adopted. The intermittent argon arc welding device can be directly popularized and applied, is used for the intermittent argon arc welding manufacturing process of rotary outer walls and multi-section plate parts, solves the problems of manual argon arc welding edge fusing, large welding deformation and low welding efficiency of intermittent welding seams of the parts, and improves the part manufacturing quality and efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aero-engine, and particularly relates to a method and tool for improving intermittent welding quality of a front section inner cone of a rotary body. BACKGROUND

[0002] The inner cone body of the front section of an aero-engine is a rotary body part, which is a sheet welding structural part formed by intermittent argon arc welding of the inner cone body front section and multiple inner cone front edge inner layers, as shown in the figure. Figures 1-2 The main process difficulty of the rotary front section inner cone assembly lies in that the intermittent welding seam quality is low and the welding deformation is large, and the roundness of the part after welding is out of tolerance, which affects the assembly of the next level assembly. In the production process, since the inner cone front edge inner layer is composed of multiple pieces, the part rigidity is poor during welding, and under the condition of unrestricted outer circle, irregular deformation of the outer circle is easily formed under the action of the welding seam radial shrinkage, which affects the outer circle runout of the part, and the roundness of the part after welding of the front edge inner layer is more than 5mm; and since the part is discontinuous, the deformation cannot be repaired by the bench worker to meet the design requirements. At present, the inner cone body of the front section seriously interferes with the assembly of the diffuser unit body and the matching part, and can only be corrected by the bench worker to make the interference part (the front edge inner layer) correct, so as to be assembled with the matching part, which is actually used in the state of exceeding the design tolerance. In addition, due to the limitation of the part structure, the inner cone body front section 1 and the multiple inner cone front edge inner layers are in butt joint mode, and manual argon arc welding is currently used for welding, but there is edge melting phenomenon at the start and stop of the front edge inner layer during welding, and the welding quality is poor and the welding deformation is large. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application provides a method and tool for improving the intermittent welding quality of the front section inner cone of the rotary body. The process edge is added at the intermittent gap position of the inner cone front section, the butt joint position structure is optimized to a plug-in mode, that is, the multiple intermittent welding seam structures are optimized to a continuous whole circle welding seam structure, a welding device is combined to realize automatic argon arc welding of the whole circle welding seam of the part, welding deformation is controlled, and welding quality and efficiency are improved, so that the part meets the design requirements.

[0004] A method for improving the intermittent welding quality of the front section inner cone of the rotary body, specifically comprising the following steps:

[0005] According to the structure of the front section inner cone body, a welding process edge structure is machined at the intermittent gap position of the inner cone front section;

[0006] The inner cone front section with the welding process edge structure is assembled;

[0007] The inner cone front edge inner layer is plugged into the welding process edge structure and positioned and welded;

[0008] The inner cone front section is pressed tightly from the outside;

[0009] The inner cone front section and the inner layer of the inner cone front edge are welded in a whole circle.

[0010] When the welding process edge structure is processed at the intermittent gap position of the inner cone front section, a laser cutting method is used.

[0011] The height of the welding process edge structure is 1.5mm-3mm.

[0012] When the inner cone front section with the welding process edge structure is assembled, the inner cone front section is expanded from the inside to the outside.

[0013] Before assembly positioning welding, the surface and end face of the to-be-welded part are mechanically cleaned.

[0014] During assembly positioning welding, two positions are positioned and welded at the edge of the process edge by argon arc welding, and 1-2 points are positioned and welded at the middle position of the inner layer of the inner cone front edge.

[0015] After whole circle welding, the parts are subjected to post-welding inspection, and the deformation of the parts is checked again after correction, until the post-welding size meets the requirements of the design drawing.

[0016] An improved rotary body front section inner cone intermittent welding quality tool for implementing the above-mentioned improved rotary body front section inner cone intermittent welding quality method, comprising: a base, the base is provided with a positioning ring for positioning the part; a mandrel is arranged in the middle of the base, the mandrel is sleeved with a cone, the cone is connected with a nut connected with the mandrel; the outer side of the cone is contacted with an expansion block through a slope, and the inner cone front section is expanded from the inside to the outside.

[0017] Further comprising a compression ring, which is compressed from the outside of the inner cone front section to the inside, and is tightly attached to the outer wall of the inner cone front section.

[0018] The base is provided with a support for supporting the expansion block.

[0019] The compression ring comprises two parts, which are tightly connected to form a complete circle.

[0020] By the above technical solution, the application has at least the following beneficial effects:

[0021] This invention provides a method and tooling for improving the quality of intermittent welding of the inner cone at the front of a rotating body. This method solves the problems of edge melting and welding deformation in intermittent welding of the inner cone. It involves adding a process edge to the intermittent notch at the front of the inner cone, optimizing the butt joint structure to an interlocking method, and optimizing the intermittent weld into a full circumferential weld. A tooling is provided to implement this method, enabling automated TIG welding of the parts instead of manual TIG welding, thereby controlling inner layer welding deformation and improving weld quality and efficiency. Parts manufactured using this invention meet the assembly requirements of the next-level components. After welding, the local deformation of the circumferential weld is less than 0.5 mm, improving the manufacturing quality of the parts.

[0022] The tooling provided by this invention incorporates six arc-shaped expansion blocks. Under the tension of these blocks, the thermal expansion of the metal at the circumferential weld is restricted, and the shrinkage stress caused by instability in the heated area is partially offset. The entire circumferential weld is welded under the rigid fixation of the tooling. The part is removed after cooling to room temperature, thus controlling the concave deformation of the entire circumferential weld. Simultaneously, the tooling includes a clamping ring, which uses two interlocking parts to form a complete circle that fits against the outer wall of the part from the outside, enhancing the overall rigidity of the part during processing and reducing outward bulging deformation.

[0023] This invention can save the amount of correction work in the unit assembly process caused by the deformation of parts due to argon arc welding. Manual argon arc welding is replaced by automatic argon arc welding, which can save the time of repairing welding defects, improve efficiency by more than 3 times, and increase the product qualification rate. Attached Figure Description

[0024] Figure 1 A schematic diagram of the inner cone at the front section of an aero engine;

[0025] Figure 2 for Figure 1 AA rotated section view;

[0026] Figure 3 A schematic diagram of the inner cone front section with a 2mm high welding process edge structure in the method for improving the intermittent welding quality of the inner cone front section of the rotating body according to the present invention;

[0027] Figure 4 for Figure 3 BB rotated section view;

[0028] Figure 5 A schematic diagram of the structure of the inner cone front section with a 2mm high welding process edge structure combined with multiple inner layers of the leading edge;

[0029] Figure 6 for Figure 5 CC-rotated sectional view;

[0030] Figure 7 for Figure 6 Enlarged view of Part I;

[0031] Figure 8 The schematic diagram of the tool for improving the intermittent welding quality of the inner cone front section of the rotary body provided by the present application;

[0032] Wherein:

[0033] 1-inner cone front section, 2-inner cone front edge inner layer, 3-intermittent weld, 4-welding process edge structure, 5-entire ring weld, 01-base, 02-positioning ring, 03- support, 04-expansion block, 05-pressing ring, 06-nut, 07-spindle, 08-cone, 09- gland. DETAILED DESCRIPTION

[0034] In order to better explain the present application, so as to be understood, the technical scheme and effect of the present application are described in detail by specific embodiments in combination with the accompanying drawings.

[0035] In combination with Figures 3-8 As shown in the figure, a method for improving the intermittent welding quality of the inner cone front section of the rotary body, specifically comprising the following steps:

[0036] Step one: analyze the design drawing and master the design structure information of the front section of the inner cone.

[0037] In this embodiment, the material of the inner cone front section 1 of the front section of the inner cone is GH3128, and the thickness is 1.2mm. The material of the inner cone front edge inner layer 2 is GH3128, and the thickness is 0.8mm.

[0038] Step two: as shown in the figure, the welding process edge structure 4 of the inner cone front section 1 is constructed. Figures 3-4

[0039] The welding process edge structure 4 is processed at the intermittent notch position of the inner cone front section 1 by using laser cutting method. In this embodiment, the welding process edge structure 4 with a height of 2mm is reserved.

[0040] Step three: polishing before welding.

[0041] The surface and end face of the to-be-welded part are mechanically cleaned by using abrasive tape, and the to-be-welded part of the part is cleaned by using anhydrous ethanol.

[0042] Step four: welding tool assembly, expanding from the inside of the inner cone front section 1 to the outside.

[0043] ​In order to expand the part, the application also provides a tool for implementing the method for improving the welding quality of the inner cone front section of the rotary body, which specifically comprises: a base 01, wherein a positioning ring 02 is installed on the base 01, and a stop is formed in the positioning ring 02 and used for positioning the part. The positioning ring 02 can provide an accurate positioning reference for the workpiece, so that the workpiece can be accurately installed at a predetermined position, and the position consistency of the workpiece clamped each time is ensured. In this way, the position accuracy of the welded joint can be ensured, and for the girth welding, the uniform distribution of the weld on the annular position is facilitated, and the welding quality and welding efficiency are improved. A mandrel 07 is arranged in the middle of the base 01, a cone 08 is sleeved on the mandrel 07, and the cone 08 is connected with a nut 06 that is screwed on the mandrel 07 through bolts. The outer side of the cone 08 is in contact with expansion blocks 04 through inclined surfaces, and in this embodiment, six expansion blocks 04 are uniformly distributed around the cone 08. The expansion blocks 04 are supported by a support 03 that is installed on the base 01.

[0044] Specifically, the expansion process is as follows: the part is installed on the stop of the positioning ring 02, and then the nut 06 is tightened, so that the nut 06 drives the cone 08 to move downward along the mandrel 07; through the contact inclined surfaces between the cone 08 and the expansion blocks 04, the six expansion blocks 04 are driven to move outward, and a complete circle is formed, so as to expand outward from the inside of the part. After expansion, a gland 09 is covered on the upper part of the welding tool. The gland 09 plays a role of sealing, protection and further fixing the workpiece, which can prevent foreign matters such as spatters generated in the welding process from entering the inside of the tool and affecting the normal work, and can further press and fix the part together with other components, so that the whole welding tool system is more stable, and the welding environment is protected to a certain extent.

[0045] Step five: assembly positioning welding.

[0046] The inner cone front edge inner layer 2 is assembled to the inner cone front section 1 with the welding process edge structure 4 and is inserted with the welding process edge structure 4, as shown in the figure; then two positioning weldings are performed at the edge of the process edge by argon arc welding, and 1-2 points of positioning welding are performed at the middle position of the inner cone front edge inner layer 2. Figures 5-7

[0047] In this embodiment, the welding parameters are as follows:

[0048] The welding wire brand is HGH3128 according to the thickness of the welded part, and the diameter is φ1.2mm;

[0049] The tungsten electrode brand is WCe20, and the diameter is φ2.0mm;

[0050] The diameter of the welding gun nozzle is φ10mm, and the argon gas flow of the welding gun is 8L / min-10L / min;

[0051] ​Welding current is 20A ~ 30A, direct current positive connection.

[0052] Step six: from the inside of the cone front section 1 outside the tight.

[0053] The tool also includes a compression ring 05, the compression ring 05 includes two parts, two parts after buckling form a complete circle, from the outside of the part tight parts, so that the compression ring 05 fits the part wall. After the expansion process is completed, it can exert pressure on the part from the side and other directions, cooperate with the expansion block 04, control the deformation of the part due to the small thickness of the inner layer of the front edge during welding.

[0054] Step seven: automatic whole circle argon arc welding of the inner cone front section 1 and the inner cone front edge inner layer 2, converting the intermittent weld 3 into a whole circle girth weld 5.

[0055] The welding parameters in the embodiment are:

[0056] Welding wire: grade HGH3128, diameter φ1.6mm;

[0057] Tungsten electrode: grade WCe20, diameter φ3.0mm;

[0058] Welding gun nozzle diameter φ18mm ~ φ24mm, welding gun argon flow rate is 15L / min ~ 20L / min, back argon flow rate is 5L / min ~ 15L / min, drag argon flow rate is 15L / min ~ 25L / min;

[0059] Welding peak current is 30A ~ 60A, welding base current is 20A ~ 40A, direct current positive connection.

[0060] Step eight: post-weld inspection.

[0061] Check the welding quality and deformation: visual inspection of the weld is not allowed to have cracks, the whole circle girth weld 5 should completely melt the process edge;

[0062] Correct the deformation;

[0063] Check the deformation of the part again until the post-weld size meets the design drawing requirements.

[0064] The method provided by the application can be directly applied to the intermittent argon arc welding manufacturing process of the rotary outer wall and the multi-section plate type part, solve the problems of edge burning, large welding deformation and low welding efficiency of the intermittent welding weld of the part, and improve the manufacturing quality and efficiency of the part.

Claims

1. A method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body, characterized in that, Specifically, the following steps are included: Based on the structure of the inner cone at the front, a welding process edge structure is machined at the discontinuous notch position at the front of the inner cone. Assembly of the front section of the inner cone with welded edge structure; The inner layer of the leading edge of the inner cone is inserted into the welding process edge structure for assembly and positioning welding; Press inward from the outside of the front section of the inner cone; The front section of the inner cone and the inner layer of the leading edge of the inner cone are welded around the entire circle.

2. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: When machining the welding process edge structure at the discontinuous notch position at the front section of the inner cone, a laser cutting method is used.

3. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: The height of the welded edge structure is 1.5mm~3mm.

4. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: When assembling the front section of the inner cone with a welded edge structure, the method of tightening from the inside out of the front section of the inner cone is adopted.

5. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: Before assembling and tack welding, the surface and end face of the area to be welded are mechanically cleaned.

6. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: During assembly and tack welding, use argon arc welding to tack weld two points at the edge of the process, and tack weld 1-2 points in the middle of the inner layer of the inner cone's leading edge.

7. The method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 1, characterized in that: After welding the entire circle, perform a post-weld inspection on the parts, correct any deformation, and then inspect the deformation of the parts again until the post-weld dimensions meet the requirements of the design drawings.

8. A tooling for improving the quality of intermittent welding of the inner cone at the front section of a rotating body, used to implement the method for improving the quality of intermittent welding of the inner cone at the front section of a rotating body as described in any one of claims 1-7, characterized in that, include: A base is provided, on which a positioning ring is installed for positioning the parts; a mandrel is provided in the middle of the base, and a cone is sleeved on the mandrel, which is connected to a nut connected to the mandrel; an expansion block is contacted on the outer side of the cone through an inclined surface, and the expansion is tightened from the inside of the front section of the inner cone outward; It also includes a clamping ring, which presses inward from the outside of the front section of the inner cone, and fits tightly against the outer wall of the front section of the inner cone.

9. The tooling for improving the intermittent welding quality of the inner cone at the front section of a rotating body according to claim 8, characterized in that: The base is equipped with a support for supporting the expansion block.

10. The tooling for improving the quality of intermittent welding of the inner cone at the front section of a rotating body according to claim 8, characterized in that: The clamping ring consists of two parts, which are interlocked to form a complete circle.

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