Forming process of high-temperature-resistant elastic sealing ring

Abstract

The invention relates to a sealing ring forming process. A sealing ring forming process comprises the following steps that a blanked annular plate is pre-stretched; the W-shaped preformed sealing ring basic part is stretched again; a landing edge is formed; welding the landing edges on the outer surfaces of the upper-layer sealing ring and the lower-layer sealing ring; carrying out destressing treatment together with the welding tool in the fourth step; and finally carrying out surface treatment. The sealing ring forming process provided by the invention is good in forming effect, good in elastic property and high in production efficiency.

Description

Technical Field

[0001] The invention relates to a high temperature resistant elastic sealing ring forming process, in particular to a sealing ring forming process for high temperature rotating and moving parts such as a rotating pin disk and a moving pin disk in a brake pin pressurizing mechanism. Background Art

[0002] The seal ring plays a vital role in the brake ball pressurization mechanism. It not only prevents lubricant leakage, but also prevents external impurities from entering the mechanism, thereby ensuring the normal operation of the mechanism and extending its service life. In a high temperature, high speed, and high load environment, the performance of the seal ring directly affects the reliability and safety of the entire brake system.

[0003] Since the brake ball pressurizing mechanism works in a high temperature environment, the sealing ring needs to have good high temperature adaptability. At high temperatures, the material of the sealing ring may soften, expand or deform, thereby affecting its sealing performance. Therefore, in the design and manufacturing process of the sealing ring, it is necessary to fully consider its high temperature adaptability and select appropriate materials and molding processes to ensure its stability and reliability in a high temperature environment. Therefore, a sealing ring that is resistant to high temperatures and can compensate for the deformation of the ball disk is needed. Therefore, someone applied for a sealing ring, including an upper sealing ring and a lower sealing ring, the upper sealing ring and the lower sealing ring are elastic to form an elastic zone, and the upper and lower sealing rings are connected to form a sealing zone. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high temperature resistant elastic sealing ring molding process with good molding effect, good elastic performance and high production efficiency.

[0005] The above technical problem of the present invention is solved by the following technical solution: a high temperature resistant elastic sealing ring molding process, The first step is to cut the annular sheet: pre-stretch the sheet into a W shape, and pre-form the sealing ring base component, which includes an upper sealing ring and a lower sealing ring, and the upper sealing ring and the lower sealing ring have the same structure; The second step is to stretch the W-shaped preformed sealing ring base member again, and form the two outermost folded surfaces of the sealing ring base member into a vertical state; The third step is to form an overlap: the overlap is used to fix the upper sealing ring and the lower sealing ring. First, a long overlapping plane is cut, and a circular groove is pressed by a roller in the center of the length direction of the overlapping plane. Then, the overlapping plane with the circular groove is rolled into a circular ring by a rolling machine; The fourth step is to weld the overlapped edge to the inner surface of the upper sealing ring and the lower sealing ring: the upper sealing ring and the lower sealing ring are arranged and installed up and down by welding tooling, the overlapped edge is installed on the inner side of the upper sealing ring and the lower sealing ring by welding tooling, and the two ends of the overlapped edge are respectively welded to the upper sealing ring and the lower sealing ring by laser welding; Step 5: Perform stress relief treatment together with the welding tooling in step 4 to prevent deformation; Step 6: Surface treatment; Step 7: Inject high temperature resistant grease into the sealing ring.

[0006] The W-shaped sealing ring assembly here does not only refer to a W-shape, which does not limit the present invention. The W-shape is only a basic constituent element, and the sealing ring base can be a wavy shape formed by connecting multiple W-shapes. According to the composition of the sealing ring base, each component is first formed separately, and then the overlap is welded to the sealing ring base. The sealing ring base is formed in a precision hydraulic press through multiple stretching forming to improve the consistency of the waveform and ensure the later use effect. The overlap groove can be easily positioned in the welding machine tooling, thereby ensuring the welding effect. Using the welding tooling, after the upper and lower sealing rings are aligned, they can be accurately welded to the overlap to ensure the stability of the product.

[0007] Preferably, in the fourth step, the overlaps of the upper sealing ring and the lower sealing ring are arranged in a staggered manner. The overlapped interface on the overlapped edge is cut according to the position of the overlapped interface of the upper sealing ring and the lower sealing ring.

[0008] Preferably, in the fourth step, the welding tooling includes a first rotary welding mold and a second rotary welding mold, and a sealing ring installation groove is formed between the first rotary welding mold and the second rotary welding mold. After the sealing ring base component is placed in the sealing ring installation groove, the sealing ring base component is pressed into the sealing ring installation groove through a pressure plate from above.

[0009] Preferably, a V-shaped positioning groove is formed on the second rotary welding mold for positioning the circular groove on the overlapping edge.

[0010] Preferably, in the fourth step, one end of the overlap is first welded to the upper sealing ring, then the sealing ring base is removed, the upper sealing ring is installed below the sealing ring installation groove, and then the other end of the overlap is welded to the lower sealing ring.

[0011] Preferably, in the fourth step, a partition is provided between the upper sealing ring and the lower sealing ring, the partition is in a circular shape, and the shape of the partition is the same as the shape of the sealing ring installation groove.

[0012] Preferably, the pre-stretching in the first step has a stretching depth of 2 / 3 of the depth of the sealing ring base member, that is, the length after the first stretching is approximately 2 / 3 of the product length.

[0013] Preferably, the sixth step of surface coating treatment comprises coating a chromium aluminum nitride coating with a coating thickness of 2-4 um.

[0014] Therefore, the high temperature resistant elastic sealing ring forming process of the present invention has the following advantages: good waveform uniformity and consistency, good forming effect, can meet the elasticity and sealing performance of the sealing ring, can realize mass production by using welding mold, and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the sealing ring.

[0016] Figure 2 yes Figure 1 An enlarged cross-sectional view of .

[0017] Figure 3 It is a simplified diagram of the sealing ring molding process.

[0018] Figure 4 It is a three-dimensional diagram of welding tooling.

[0019] Figure 5 It is an enlarged cross-sectional view of the welding fixture after the sealing ring is installed.

[0020] Figure 6 It is a three-dimensional view of the first rotary welding mold of the welding tooling.

[0021] Figure 7 It is a three-dimensional view of the fan-shaped piece of the second rotary welding mold of the welding tooling.

[0022] Figure 8 It is a three-dimensional view of the pressure plate of the welding tool. DETAILED DESCRIPTION

[0023] The technical solution of the invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0024] Example: like Figure 1 and 2 As shown in 3, the basic parts of the formed sealing ring are: a DC03 annular sheet with a thickness of about 0.3 mm is selected for blanking, and then the sheet in the pre-stretching mold is pre-stretched by a double-acting thin plate stretching hydraulic press, so that the cross section of the sheet is formed into a wavy sealing ring basic component. The sealing ring basic component includes an upper sealing ring and a lower sealing ring of the same shape. The depth of the stretched sealing ring basic component is about 2 / 3 of the formed product. Then, secondary stretching is performed, and the sheet in the forming stretching mold is secondary stretched by a double-acting thin plate stretching hydraulic press, and the two outermost folded surfaces of the sealing ring basic component are formed into a vertical state.

[0025] Forming overlap: Cutting a long strip of plate, processing a circular groove 71 on the plate by using a beading machine, and then using a rolling machine to roll the plate into a circle.

[0026] Welding: The upper sealing ring, the lower sealing ring and the overlap are placed in a welding tool, and the overlaps of the upper sealing ring and the lower sealing ring are arranged in a staggered manner. The overlap is cut according to the overlap positions of the upper sealing ring and the lower sealing ring to form a Z-shaped cut 72. Then, laser welding is first used to complete the welding of one end of the overlap with the upper sealing ring. After the upper sealing ring and the overlap are welded, the lower sealing ring and the lower sealing ring are swapped, and the other end of the overlap is welded with the lower sealing ring by laser welding.

[0027] like Figure 4 and 5 As shown, a sealing ring welding tooling structure includes a circular first rotary welding mold 1, a movable second rotary welding mold 2 is arranged on the first rotary welding mold 1, a sealing ring installation groove 17 is formed between the first rotary welding mold 1 and the second rotary welding mold 2, an upper sealing ring 5 and a lower sealing ring 6 are installed in the sealing ring installation groove 17, a partition 8 is placed between the upper sealing ring 5 and the lower sealing ring 6, and the partition 8 is substantially the same width as the sealing ring installation groove 17. A pressing plate 3 is arranged above the sealing ring installation groove 17, and the pressing plate 3 is fixed to the first rotary welding mold 1 by bolts. The sealing ring installation groove 17 is located on one side of the second rotary welding mold 2, and a gap 4 is left between the groove wall and the pressing surface of the pressure plate 3. The second rotary welding mold 2 is provided with a lap positioning groove 15 on the outer circumferential surface facing the sealing ring installation groove. The lap positioning groove 15 is V-shaped and is used to position the lap 8. There is an arc-shaped protrusion in the center of the lap 8, and the protrusion abuts against the lap positioning groove 15. The two ends of the lap 8 are respectively welded to the upper sealing ring 5 and the lower sealing ring 6.

[0028] like Figure 6 As shown, the first rotary welding mold 1 includes a fixed ring 11, and the fixed ring 11 is evenly provided with through holes 18 fixed to the pressure plate. A stepped surface 12 is formed on the inner wall surface of the fixed ring. The stepped surface 12 includes three steps. The first stepped surface is used for positioning with the second rotary welding mold, the second stepped surface is used for forming a sealing ring installation groove, and the third stepped surface is higher than the plane of the fixed ring. The third stepped surface and the fixed ring form a positioning surface of the pressure plate. Bolt holes 16 for fixing the second rotary welding mold are also formed on the bottom surface of the first rotary welding mold.

[0029] like Figure 7As shown, the second rotary welding mold is composed of three sector-shaped pieces, and a waist hole 13 is opened on the sector-shaped piece. After adjusting the radial position of the second rotary welding mold, the bolts are inserted into the waist holes and then fixed in the bolt holes 16 on the bottom surface of the first rotary welding mold, so that the sector-shaped piece is fixed to the first rotary welding mold 1. A plurality of protrusions 14 are formed on the sector-shaped piece, and an overlap positioning groove 15 is formed on the outer side of the protrusion.

[0030] like Figure 8 As shown, the pressing plate is annular, and an annular bottom surface 9 corresponding to the first rotary welding mold fixing ring is provided on the bottom surface of the pressing plate, and a through hole is opened on the annular bottom surface, and the through hole corresponds to the through hole on the first rotary welding mold fixing ring, and a stepped surface 10 is provided on the inner side of the annular bottom surface for positioning and fixing with the first rotary welding mold. Then the two are connected by bolts.

[0031] When in use, put the upper sealing ring and the lower sealing ring into the sealing groove installation groove, then position the overlap by the second rotary welding mold, move the fan-shaped piece of the second rotary welding mold radially, press the overlap against the sealing ring, and then put on the pressure plate, leaving a gap between the pressure plate and the fan-shaped piece, use laser welding to fix the upper sealing ring and the overlap, then disassemble the pressure plate and the second rotary welding mold, swap the positions of the upper sealing ring and the lower sealing ring, cover the pressure plate again, adjust the radial position of the second rotary welding mold, and use laser welding again to weld the overlap and the lower sealing ring.

[0032] Heat treatment: After welding is completed, the welding tooling with the welded product is subjected to stress relief treatment as a whole; Surface coating treatment: After the stress treatment, the product is taken out from the welding tooling, and the surface is treated with wear resistance and coating. A chromium aluminum nitride coating is plated on the surface with a coating thickness of 2-4um.

[0033] Grease injection: After the surface treatment is completed, inject high temperature resistant grease into the sealing ring.

[0034] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high temperature resistant elastic sealing ring forming process, characterized in that: The first step is to cut the annular sheet: pre-stretch the sheet into a W shape, and pre-form the sealing ring base component, which includes an upper sealing ring and a lower sealing ring, and the upper sealing ring and the lower sealing ring have the same structure; The second step is to stretch the W-shaped preformed sealing ring base member again, and form the two outermost folded surfaces of the sealing ring base member into a vertical state; The third step is to form an overlap: the overlap is used to fix the upper sealing ring and the lower sealing ring. First, a long overlapping plane is cut, and a circular groove is pressed by a roller in the center of the length direction of the overlapping plane. Then, the overlapping plane with the circular groove is rolled into a circular ring by a rolling machine; The fourth step is to weld the overlapped edge to the inner surface of the upper sealing ring and the lower sealing ring: the upper sealing ring and the lower sealing ring are arranged and installed up and down by welding tooling, the overlapped edge is installed on the inner side of the upper sealing ring and the lower sealing ring by welding tooling, and the two ends of the overlapped edge are respectively welded to the upper sealing ring and the lower sealing ring by laser welding; Step 5: Perform stress relief treatment together with the welding tooling in step 4 to prevent deformation; Step 6: Surface treatment; Step 7: Inject high temperature resistant grease into the sealing ring.

2. A high temperature resistant elastic sealing ring forming process according to claim 1, characterized in that: In the fourth step, the overlaps of the upper sealing ring and the lower sealing ring are arranged in a staggered manner, and the overlapped interfaces on the overlapped edges are cut according to the positions of the overlaps of the upper sealing ring and the lower sealing ring.

3. A high temperature resistant elastic sealing ring forming process according to claim 1, characterized in that: In the fourth step, the welding tooling includes a first rotary welding mold and a second rotary welding mold, and a sealing ring installation groove is formed between the first rotary welding mold and the second rotary welding mold. After the sealing ring base component is placed in the sealing ring installation groove, the sealing ring base component is pressed into the sealing ring installation groove through a pressure plate above.

4. A high temperature resistant elastic sealing ring forming process according to claim 3, characterized in that: A V-shaped positioning groove is formed on the second rotary welding die for positioning the circular groove on the overlapped edge.

5. A high temperature resistant elastic sealing ring forming process according to any one of claims 1 to 4, characterized in that: In the fourth step, first weld one end of the overlap to the upper sealing ring, then take out the sealing ring base, install the upper sealing ring under the sealing ring installation groove, and then weld the other end of the overlap to the lower sealing ring.

6. A high temperature resistant elastic sealing ring forming process according to any one of claims 1 to 4, characterized in that: In the fourth step, a partition is arranged between the upper sealing ring and the lower sealing ring. The partition is in the shape of a circular ring and has the same shape as the sealing ring installation groove.

7. A high temperature resistant elastic sealing ring forming process according to any one of claims 1 to 4, characterized in that: The pre-stretching in the first step has a stretching depth of 2 / 3 of the depth of the sealing ring base.

8. A high temperature resistant elastic sealing ring forming process according to any one of claims 1 to 4, characterized in that: The sixth step of surface coating treatment is to apply a chromium nitride aluminum coating with a coating thickness of 2-4 um.

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