CN-122007813-A - Vacuum brazing process for sealing ring type honeycomb products

CN122007813ACN 122007813 ACN122007813 ACN 122007813ACN-122007813-A

Abstract

The invention relates to a vacuum brazing process of a seal ring honeycomb product, which comprises the following steps of S1, preparing a strip honeycomb, S2, performing energy storage spot welding on the strip honeycomb, bending the strip honeycomb into a whole circle, performing energy storage spot welding on two ends of the strip honeycomb to fix the strip honeycomb to obtain a honeycomb core ring, S3, cleaning the honeycomb core ring and a seal outer ring, S4, adding brazing filler metal on the outer circumferential surface of the honeycomb core ring, S5, combining and positioning, filling the honeycomb core ring into an inner hole of the seal outer ring, ensuring that the outer circumferential surface of the honeycomb core ring is well attached to a brazing surface on the inner circumferential surface of the seal outer ring, obtaining a combined part, positioning the honeycomb core ring and the seal outer ring through the energy storage spot welding, performing welding, fixing the honeycomb core ring and the seal outer ring through the energy storage spot welding, S6, performing the cleaning of a circle of blocking agent near the brazing filler metal in the combined part, S7, performing the drying of the brazing filler metal in the combined part before entering a furnace, S8, performing the furnace vacuum brazing on the combined part, filling the combined part into a vacuum furnace, and performing the vacuum brazing to obtain the welded seal ring honeycomb product.

Inventors

PENG SIZE
PENG JUNCHAO
WANG RONG
GAO PENG

Assignees

湖南星途航空航天器制造有限公司

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (10)

1. The vacuum brazing process of the seal ring type honeycomb product comprises a seal outer ring and a honeycomb core ring, and is characterized by comprising the following steps of: S1, preparing strip-shaped honeycombs, and checking whether the strip-shaped honeycombs meet the requirements; S2, energy storage spot welding of the strip honeycomb, namely bending the strip honeycomb meeting the requirements into a whole circle, and fixing the two ends through the energy storage spot welding to obtain a honeycomb core ring; s3, cleaning the honeycomb core ring and the sealing outer ring; S4, adding brazing filler metal, namely adding brazing filler metal on the outer circumferential surface of the honeycomb core ring; s5, combining and positioning, namely loading the honeycomb core ring into an inner hole of the sealing outer ring, and ensuring that the outer circumferential surface of the honeycomb core ring is well attached to a brazing surface on the inner circumferential surface of the sealing outer ring to obtain a combined piece; s6, brushing a choking agent, namely brushing a circle of choking agent near the brazing filler metal in the assembly; S7, drying the brazing filler metal, namely drying the brazing filler metal in the assembly before entering a furnace; And S8, loading the assembly into a vacuum furnace for vacuum brazing, and obtaining a welded sealing ring honeycomb product.
2. The vacuum brazing process of the seal ring type honeycomb product according to claim 1, wherein the step S1 comprises trimming the size of the strip-shaped honeycomb, grinding welding inclined planes at two ends of the strip-shaped honeycomb, wherein the inclination angles beta of the welding inclined planes at the two ends are the same, and the beta is 25-35 degrees, and in the step S2, the welding inclined planes at the two ends are attached when the strip-shaped honeycomb is bent into a whole circle and are welded at the joint of the welding inclined planes.
3. A vacuum brazing process for a seal ring type honeycomb product according to claim 1 is characterized in that the process S1 comprises cutting a trimming strip honeycomb of a proper length, marking the length of a neutral layer of the strip honeycomb as X, wherein the length dimension X= (the diameter of a circumferential surface to be welded on the inner circumferential surface of a seal outer ring-the thickness t of the strip honeycomb) ×3.14+10mm), combining the strip honeycomb trial into a ring shape, trial-installing the ring into the seal outer ring, marking the honeycomb length by a marker pen, marking the honeycomb length as Y, taking larger values of X and Y as blanking dimensions L of the strip honeycomb, measuring the diameter D of the outer circumferential surface of the honeycomb core ring by using pi, wherein the diameter D is required to be at least 1mm larger than the diameter D of a brazing surface on the inner circumferential surface of the seal outer ring, namely the interference of the honeycomb core ring is larger than 1mm, and in the process S5, if the honeycomb core ring cannot be installed in the seal outer ring, cutting the welding inclined surface of the honeycomb core ring, adjusting the length, and guaranteeing that the diameter of the honeycomb core ring is larger than the diameter D of the honeycomb core ring is required to be rotated manually, and the honeycomb ring is not required to be rotated after the honeycomb ring is rotated by 1 mm.
4. The vacuum brazing process for the seal ring type honeycomb product according to claim 1, wherein in the step S2, energy storage spot welding of the strip-shaped honeycomb is performed by adopting a welding positioning tool, the welding positioning tool comprises a lower pressing plate, an upper pressing plate and a fixing piece, the upper pressing plate is fixedly arranged on the lower pressing plate through the fixing piece, a containing cavity for containing the strip-shaped honeycomb is arranged between the lower pressing plate and the upper pressing plate, a welding working groove is formed in the upper pressing plate, two ends of the strip-shaped honeycomb extend into the containing cavity from the containing cavity respectively and enable welding inclined planes at the two ends to be attached to each other, the upper pressing plate and the lower pressing plate clamp and fix the two ends of the strip-shaped honeycomb, the welding inclined planes are opposite to the welding working groove, and spot welding is performed at the attaching position of the welding inclined planes through the welding working groove.
5. The vacuum brazing process of the seal ring type honeycomb product according to claim 1, wherein the step S4 comprises the steps of attaching brazing filler metal with the thickness of 0.25-0.50 mm to the outer circumferential surface of the honeycomb core ring to be welded, uniformly rolling the brazing filler metal into the honeycomb core cells, and removing the brazing filler metal outside the honeycomb core to expose the metal surface of the honeycomb core ring.
6. The vacuum brazing process for a seal ring type honeycomb product according to claim 5, wherein in the step S4, According to the shape of the outer circle of the honeycomb core ring, two layers of 0.25 mm-thick BNi82CrSiB or AMS4777 series adhesive tape solder are cut, stuck on the outer circumferential surface of the honeycomb core ring to be welded layer by layer, and uniformly rolled into the honeycomb core lattice layer by layer.
7. A vacuum brazing process for a seal ring type honeycomb product according to claim 1 is characterized in that the step S5 comprises the steps of arranging a welding tool comprising a lower electrode and an upper electrode, wherein the lower electrode is provided with an arc positioning cavity, the diameter of the arc positioning cavity is larger than the diameter d of the outer circumferential surface of a seal outer ring, the seal outer ring is placed in the arc positioning cavity of the lower electrode and axially parallel to the arc positioning cavity, the lower electrode and the upper electrode are respectively connected with a negative electrode and a positive electrode of a power supply, and the honeycomb core ring and the seal outer ring are welded and fixed through energy storage spot welding positioning.
8. The vacuum brazing process for a seal ring type honeycomb product according to claim 6, wherein in the step S5, The four types of lower electrodes are arranged, the diameters of the arc positioning cavities are 125.2mm, 237.0mm, 366.6mm and 518.0mm respectively, the arc positioning cavity with the diameter of 125.2mm is used for a sealing outer ring with the diameter d being smaller than 120mm, the arc positioning cavity with the diameter of 237.0mm is used for a sealing outer ring with the diameter d being 120-230 mm, the arc positioning cavity with the diameter of 366.6mm is used for a sealing outer ring with the diameter d being 230-360 mm, and the arc positioning cavity with the diameter of 518.0mm is used for a sealing outer ring with the diameter d being 360-510 mm.
9. The vacuum brazing process of the seal ring type honeycomb product according to claim 1, wherein the step S8 is characterized in that after the vacuum degree meets the requirement, the temperature is raised to be within 600+/-5 ℃ and kept for more than 15 minutes at the temperature, then the temperature is continuously raised to be within 950+/-5 ℃ and kept for 10-15 minutes at the temperature, then the temperature is continuously raised to be within 1040+/-10 ℃ and kept for 6-8 minutes, the heat preservation is completed, the temperature is cooled to be below 950 ℃, inert gas is filled in a vacuum furnace to be 1.2-1.5 bar, then the temperature is rapidly cooled to be below 70 ℃, and the welded assembly is discharged.
10. The vacuum brazing process for sealing ring type honeycomb products according to claim 1, further comprising the steps of: s9, repair welding, namely performing repair welding treatment on the welded seal ring honeycomb products with unqualified appearance or unqualified performance; s10, removing the flow blocking agent from the sealing ring honeycomb product; S11, bench work treatment, namely polishing and sealing welding seams in the ring honeycomb products, removing redundant brazing filler metal, and ensuring that the quality of the welding seams meets the requirements of standards and design drawings; S12, checking, namely checking the sealing ring honeycomb product to check whether the sealing ring honeycomb product meets the design requirement.

Description

Vacuum brazing process for sealing ring type honeycomb products Technical Field The invention relates to the technical field of honeycomb part welding manufacture, in particular to a vacuum brazing process of a seal ring type honeycomb product. Background The sealing ring honeycomb product is a common aviation product, is a key sacrificial sealing element in an aeroengine, is worn by the honeycomb with low cost and easy replacement, protects a high-value core rotating part, and simultaneously realizes high-efficiency pneumatic sealing to directly influence the efficiency, reliability and service life of the engine. Under the current rapid development of aviation products towards high quality and high requirements, the manufacturing precision and reliability of the seal ring type honeycomb products face more serious challenges. Ring-like honeycomb core rings are typically welded to a honeycomb core ring in an outer ring. The welding process of the seal ring type honeycomb product is a complex process comprising a plurality of working procedures, wherein each working procedure influences the final welding quality, and the welding quality directly influences the working performance of the seal ring type honeycomb product. Factors that primarily affect the weld quality include, but are not limited to, whether there is misalignment of the inner cells when the honeycomb core ring is made, the combination and positioning of the honeycomb core ring and the outer ring to achieve me quality, process parameters in subsequent brazing, and the like. In the prior art, the honeycomb core ring is prepared by adopting a resistance spot welding or roll welding mode to connect strip-shaped honeycombs end to end, and if the core grids are misplaced in the process, the flow field characteristic is deteriorated, and the aerodynamic loss is increased. The welding positioning of the honeycomb core ring and the outer ring is mostly realized by directly pressing by adopting a rigid electrode, and the honeycomb wall is extremely thin (usually only 0.05-0.25 mm) and is of a hexagonal special-shaped structure, so that the phenomenon of current concentration is extremely easy to occur, the defects of local overheating, surface burning and even sucking are caused, and the quality problems of partial unwelded parts and the like are caused by insufficient subsequent machining allowance or uneven filling of brazing filler metal during brazing. In addition, the traditional welding process lacks system control on mass transfer among the working procedures, and is difficult to realize quality control and defect prevention of the whole process. How to build a complete quality control system from honeycomb molding, ring welding preparation to final assembly through the integral optimization of a plurality of process links, and improve the welding quality of sealing ring honeycomb products is a technical problem to be solved in the field. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a vacuum brazing process for sealing ring type honeycomb products, which can effectively improve the welding quality of the sealing ring type honeycomb products. In order to achieve the above object, the present invention provides a vacuum brazing process for a seal ring type honeycomb product, the seal ring type honeycomb product including a seal outer ring and a honeycomb core ring, the vacuum brazing process comprising the steps of: S1, preparing strip-shaped honeycombs, and checking whether the strip-shaped honeycombs meet the requirements; S2, energy storage spot welding of the strip honeycomb, namely bending the strip honeycomb meeting the requirements into a whole circle, and fixing the two ends through the energy storage spot welding to obtain a honeycomb core ring; s3, cleaning the honeycomb core ring and the sealing outer ring; S4, adding brazing filler metal, namely adding brazing filler metal on the outer circumferential surface of the honeycomb core ring; s5, combining and positioning, namely loading the honeycomb core ring into an inner hole of the sealing outer ring, and ensuring that the outer circumferential surface of the honeycomb core ring is well attached to a brazing surface on the inner circumferential surface of the sealing outer ring to obtain a combined piece; s6, brushing a choking agent, namely brushing a circle of choking agent near the brazing filler metal in the assembly; S7, drying the brazing filler metal, namely drying the brazing filler metal in the assembly before entering a furnace; And S8, loading the assembly into a vacuum furnace for vacuum brazing, and obtaining a welded sealing ring honeycomb product. Further, the step S1 comprises trimming the size of the strip-shaped honeycomb, grinding welding inclined planes at two ends of the strip-shaped honeycomb, wherein the inclination angles beta of the welding inclined planes at the two ends are the same, and