Non-circular expansion ring type sealing ring machining device and method

Abstract

The invention discloses a non-circular expansion ring type sealing ring machining device and method, and solves the problems that a non-circular expansion ring type sealing ring mainly adopts a profiling lathe machining method, and adopts a traditional mode of hard profiling or mechanical profiling, so that a cam is easy to wear during machining, and the machining precision is further influenced. The non-circular expansion ring type sealing ring to be machined is clamped and fixed through the cover plate and the mandrel, natural expansion of the non-circular expansion ring type sealing ring is limited through the first outer ring, the non-circular expansion ring type sealing ring is limited through the second outer ring when the non-circular expansion ring type sealing ring is cut on the inner circle, the working size requirement of the non-circular expansion ring type sealing ring can be effectively met, the quality reliability of products is greatly guaranteed, and the machining efficiency is improved. And an effective guarantee is provided for the sealing effect.

Description

Technical Field

[0001] The present invention relates to a sealing ring processing device and method, and particularly to a non-circular expansion ring type sealing ring processing device and method. Background Art

[0002] The expansion ring type sealing ring is a split elastic ring widely used in the sealing of rotating shafts. It has a simple and compact structure and is a key component in the rotating dynamic sealing structure of the transmission system, and is widely used in the components of liquid rocket engines. This sealing ring plays a sealing role between the rotating shaft and the fixed component, and its performance directly affects the overall safety and reliability of the transmission system.

[0003] The traditional circular expansion ring sealing ring is an open thin-walled circular ring in the free state. During operation, its ring contracts to the assembly position and relies on its self-tightening force to expand and tighten in the reverse direction to achieve the sealing effect. With the continuous development of the power technology of liquid rocket engines, higher and higher requirements are put forward for the performance of the expansion ring type sealing ring. In the working conditions with a high PV value, the traditional circular expansion ring sealing ring is prone to large leakage and wear, resulting in premature failure of the sealing ring.

[0004] Therefore, the research on non-circular expansion ring type sealing rings emerged. Its design breaks through the traditional circular structure and takes into account more complex sealing environments and medium characteristics. The design of this sealing ring is mainly based on an in-depth understanding of the medium flow characteristics and full consideration of the sealing contact stress and elastic-plastic deformation. By optimizing the geometric shape and material selection of the sealing ring, the sealing performance can be significantly improved, and leakage and wear can be reduced. This research helps to improve the performance of the expansion ring sealing ring to meet the increasing sealing requirements, and also helps to promote the development of sealing technology.

[0005] However, due to its own characteristics, the non-circular expansion ring type sealing ring has difficulties in non-circular curves, large sizes, thin walls, and open processing, resulting in obstacles to its design and manufacturing. Currently, the mainly adopted method is profiling lathe processing, using traditional methods such as hard templates or mechanical templates. During processing, the cam is prone to wear, which in turn affects the processing accuracy; and it is prone to deformation during the processing process, resulting in a low qualified rate. Summary of the Invention

[0006] In order to solve the technical problems in the prior art that the non-circular expansion ring type sealing ring mainly adopts the profiling lathe processing method, using traditional methods such as hard templates or mechanical templates, the cam is prone to wear during processing, which in turn affects the processing accuracy; and it is prone to deformation during the processing process, resulting in a low qualified rate, the present invention provides a non-circular expansion ring type sealing ring processing device and method, which can be extended to similar products, can effectively solve various existing problems, and achieve the improvement of quality and efficiency in the manufacturing of rocket engine sealing products.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A processing device for a non-circular expansion ring type sealing ring, characterized in that it includes a cover plate, a mandrel, a first outer ring and a second outer ring;

[0009] The mandrel is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type sealing ring to be processed in the working state, and is used for installing on the bottom surface of the non-circular expansion ring type sealing ring to be processed;

[0010] The cover plate is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type sealing ring to be processed in the working state, and is used for installing on the top surface of the non-circular expansion ring type sealing ring to be processed and is detachably connected to the mandrel, so as to clamp the non-circular expansion ring type sealing ring to be processed between the mandrel and the cover plate;

[0011] The first outer ring is used for being sleeved outside the mandrel, the cover plate and the non-circular expansion ring type sealing ring to be processed before external circle grinding, so as to limit the external expansion action of the non-circular expansion ring type sealing ring to be processed;

[0012] The second outer ring is used for being sleeved outside the non-circular expansion ring type sealing ring to be processed, so as to detect the non-circular expansion ring type sealing ring to be processed and perform internal circle wire cutting.

[0013] Further, an inward first annular protrusion is provided on the inner wall of the first outer ring around its circumference;

[0014] The inner wall of the first annular protrusion is an annular limiting surface, which is used for limiting the outer circle of the non-circular expansion ring type sealing ring to be processed.

[0015] Further, the inner hole of the second outer ring is a stepped hole with its step surface facing upward, which is used for bearing the non-circular expansion ring type sealing ring to be processed.

[0016] Further, a second annular protrusion is provided on the outer peripheral surface of the mandrel, and the thickness of the second annular protrusion along the radial direction of the mandrel is greater than the thickness of the first annular protrusion along the radial direction of the first outer ring, and the height of the second annular protrusion is lower than the height of the first annular protrusion.

[0017] Further, the cover plate and the mandrel are detachably connected by a plurality of bolts correspondingly arranged at the middle hole of the non-circular expansion ring type sealing ring to be processed.

[0018] Further, the plurality of bolts are evenly distributed around the circumference of the cover plate.

[0019] Further, the number of the bolts is 8 to 16.

[0020] A processing method for a non-circular expansion ring type sealing ring, adopting the above-mentioned processing device for a non-circular expansion ring type sealing ring, is characterized in that it includes the following steps:

[0021] Step 1: Successively perform rough turning of the blank, end face grinding, end face lapping, outer circle milling, and opening wire cutting on the blank of the non-circular expansion ring seal to form the non-circular expansion ring seal to be processed;

[0022] Step 2: After tightening the non-circular expansion ring seal to be processed, perform limit assembly within the inner circle of the first outer ring. The non-circular expansion ring seal to be processed freely expands until its outer circle abuts against the inner circle of the first outer ring. Then, sleeve the first outer ring (3) outside the mandrel so that the bottom surface of the non-circular expansion ring seal to be processed contacts the top surface of the mandrel;

[0023] Step 3: Cover the cover plate on the top surface of the non-circular expansion ring seal to be processed and detachably connect it to the mandrel, so that the non-circular expansion ring seal to be processed is clamped and fixed between the cover plate and the mandrel, and then remove the first outer ring;

[0024] Step 4: Perform outer circle grinding on the non-circular expansion ring seal to be processed clamped between the cover plate and the mandrel;

[0025] Step 5: Remove the cover plate and the mandrel, place the non-circular expansion ring seal to be processed after outer circle grinding in the second outer ring, perform inner circle wire cutting on the non-circular expansion ring seal to be processed with a preset width, and then remove the second outer ring to complete the processing of the non-circular expansion ring seal.

[0026] Further, before step 5 and after step 4, it also includes:

[0027] Step A: Repeat grinding;

[0028] Remove the cover plate and the mandrel, rotate the non-circular expansion ring seal to be processed to change its position between the cover plate and the mandrel, and then return to step 2 until the preset return times are completed; and each time outer circle grinding is performed, ensure that there is a margin on the outer circle of the non-circular expansion ring seal to be processed.

[0029] Further, before step 5, it also includes:

[0030] Step B: Detection

[0031] Remove the cover plate and the mandrel, place the non-circular expansion ring seal to be processed after outer circle grinding on the step surface inside the second outer ring, and detect the light transmittance of the gap between the outer circle of the non-circular expansion ring seal to be processed and the inner circle of the second outer ring;

[0032] If its light transmittance meets the preset requirements, then execute step 5;

[0033] If its light transmittance does not meet the preset requirements, then remove the second outer ring and return to step 2 until its light transmittance meets the preset requirements.

[0034] The beneficial effects of the present invention:

[0035] 1. A processing device and method for a non-circular expansion ring type sealing ring provided by the present invention clamp and fix the non-circular expansion ring type sealing ring to be processed through a cover plate and a mandrel, limit its natural expansion through a first outer ring, and limit it during inner circle cutting through a second outer ring, which can effectively ensure the working dimension requirements of the non-circular expansion ring type sealing ring, greatly ensure the quality reliability of the product, and provide an effective guarantee for its sealing effect.

[0036] 2. A processing device and method for a non-circular expansion ring type sealing ring provided by the present invention reduce the requirements (dimensions and geometric tolerances before grinding) of the pre-processing of the non-circular expansion ring type sealing ring to be processed (the pre-processing includes rough turning of the blank, end face grinding, end face lapping, outer circle milling, and opening wire cutting), and greatly improve the production quality and efficiency.

[0037] 3. When processing traditional non-circular products, it is necessary to inversely calculate the non-circular dimensions for processing in the free state with the help of calculation formulas based on the circular dimensions in the working state, and then perform non-circular milling processing, which consumes a large amount of calculation effort and tooling design and processing, and the requirements for dimensions during non-circular milling are also very strict. The present invention simplifies the processing calculation and processing process method. It only needs to correct according to the free state dimensions of the ring until the required working dimensions are met. The overall processing optimizes the redundant processes and calculation amount, simplifies the processing process with a simple and ingenious method, and makes it more in line with the working requirements.

[0038] 4. A processing device and method for a non-circular expansion ring type sealing ring provided by the present invention have a clear principle, are simple and easy to use. It can be used for similar products only by replacing the first outer ring and the second outer ring, with low cost, easy to reuse, and strong popularization.

[0039] 5. A processing device for a non-circular expansion ring type sealing ring provided by the present invention is provided with a first annular protrusion on the first outer ring, which is beneficial to limit the outer circle of the non-circular expansion ring type sealing ring to be processed and improve the processing accuracy.

[0040] 6. A processing device for a non-circular expansion ring type sealing ring provided by the present invention is provided with a second annular protrusion on the outer peripheral surface of the mandrel, and the radial thickness of the second annular protrusion is greater than the radial thickness of the first annular protrusion. When the non-circular expansion ring type sealing ring to be processed expands freely, the second annular protrusion can abut against the inner surface of the first ring, thereby ensuring the stability of the processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic structural diagram of the use state of the processing device for the non-circular expansion ring type sealing ring corresponding to step 2 in the embodiment of the present invention;

[0042] Figure 2 is a schematic structural diagram of the use state of the processing device for the non-circular expansion ring type sealing ring corresponding to step 3 in the embodiment of the present invention;

[0043] Figure 3 It is a schematic structural diagram of the working state of the non-circular expansion ring type seal ring processing device corresponding to step 4 in the embodiment of the present invention;

[0044] Figure 4 It is a schematic structural diagram of the working state of the non-circular expansion ring type seal ring processing device corresponding to step B in the embodiment of the present invention;

[0045] Figure 5 It is a schematic structural diagram of the working state of the non-circular expansion ring type seal ring processing device corresponding to step 5 in the embodiment of the present invention.

[0046] Reference numerals in the drawings:

[0047] 1 - Cover plate, 2 - Mandrel, 21 - Second annular protrusion, 3 - First outer ring, 31 - First annular protrusion, 4 - Second outer ring, 41 - Step surface, 5 - Non-circular expansion ring type seal ring to be processed, 6 - Bolt, 7 - Gap. Specific embodiments

[0048] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] An embodiment of the present invention provides a non-circular expansion ring type seal ring processing device, as Figures 1-5 shown, which includes a cover plate 1, a mandrel 2, a first outer ring 3 and a second outer ring 4; the sizes of the first outer ring 3 and the second outer ring 4 are determined according to the working dimensions of the non-circular expansion ring type seal ring 5 to be processed.

[0050] The mandrel 2 is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type seal ring 5 in the working state, and is used to be installed on the bottom surface of the non-circular expansion ring type seal ring 5 to be processed; a second annular protrusion 21 is provided on the outer peripheral surface of the mandrel 2, and its thickness along the radial direction of the mandrel 2 is greater than the thickness of the first annular protrusion 31 along the radial direction of the first outer ring 3, and the height of the second annular protrusion 21 is lower than the height of the first annular protrusion 31.

[0051] The cover plate 1 is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type seal ring 5 in the working state, and is used to be installed on the top surface of the non-circular expansion ring type seal ring 5 to be processed and is detachably connected to the mandrel 2, so as to clamp the non-circular expansion ring type seal ring 5 to be processed between the mandrel 2 and the cover plate 1; the cover plate 1 and the mandrel 2 are detachably connected by 8 to 16 bolts 6 provided at the corresponding middle hole of the non-circular expansion ring type seal ring 5 to be processed, and the 8 to 16 bolts 6 are evenly distributed circumferentially around the cover plate 1.

[0052] The first outer ring 3 is used to be sleeved on the mandrel 2, the cover plate 1 and the non-circular expansion ring type sealing ring 5 to be machined before external cylindrical grinding, so as to limit the external expansion action of the non-circular expansion ring type sealing ring 5 to be machined; an inward first annular protrusion 31 is arranged on the inner wall of the first outer ring 3 around its circumference; the inner wall of the first annular protrusion 31 is an annular limiting surface for limiting the outer circle of the non-circular expansion ring type sealing ring 5 to be machined.

[0053] The second outer ring 4 is used to be sleeved on the non-circular expansion ring type sealing ring 5 to be machined, so as to detect and perform internal circle wire cutting on the non-circular expansion ring type sealing ring 5 to be machined. The inner hole of the second outer ring 4 is a stepped hole with its step surface 41 facing upward for carrying the non-circular expansion ring type sealing ring 5 to be machined.

[0054] This embodiment sets a processing route for the non-circular expansion ring type sealing ring processing device: rough turning of the blank → end face grinding → end face lapping → external circle milling → opening wire cutting → external circle grinding → internal circle wire cutting → surface treatment.

[0055] The steps of processing using the above non-circular expansion ring type sealing ring processing device are as follows:

[0056] Step 1: Rough turn, end face grind, end face lap, mill and perform opening wire cutting on the blank of the non-circular expansion ring type sealing ring in sequence to form the non-circular expansion ring type sealing ring 5 to be machined; that is, the first five processes are all carried out by conventional processing methods, and to a certain extent, the deformation amount and deformation degree during processing do not need to be considered;

[0057] Step 2: As Figure 1 shown, after tightening the non-circular expansion ring type sealing ring 5 to be machined, it is assembled and limited in the inner ring of the first outer ring 3. The non-circular expansion ring type sealing ring 5 to be machined freely expands until its outer circle abuts against the inner circle of the first outer ring 3. Then the first outer ring 3 is sleeved outside the mandrel 2, so that the bottom surface of the non-circular expansion ring type sealing ring 5 to be machined contacts the top surface of the mandrel 2;

[0058] Step 3: As Figure 2 shown, the cover plate 1 is covered on the non-circular expansion ring type sealing ring 5 to be machined, and the bolt 6 is tightened to realize the detachable connection between the cover plate 1 and the mandrel 2, so that the non-circular expansion ring type sealing ring 5 to be machined is clamped and fixed between the cover plate 1 and the mandrel 2. Then the first outer ring 3 is removed, making the non-circular expansion ring type sealing ring 5 to be machined exposed;

[0059] Step 4: As Figure 3 shown, the assembly of the cover plate 1, the mandrel 2 and the non-circular expansion ring type sealing ring 5 to be machined clamped between the cover plate 1 and the mandrel 2 is clamped on the grinding equipment (grinder), and the non-circular expansion ring type sealing ring 5 to be machined clamped between the cover plate 1 and the mandrel 2 is externally ground according to a predetermined program; ensure that the non-circular expansion ring type sealing ring to be machined is a complete circle in this state;

[0060] Step A: Repeated grinding

[0061] Remove the cover plate 1 and the mandrel 2, rotate the non-circular expanding ring seal 5 to be machined to change its position between the cover plate 1 and the mandrel 2, and then return to Step 2 until the preset number of returns is completed; and each time external circle grinding is performed, ensure that there is a margin on the external circle of the non-circular expanding ring seal 5 to be machined.

[0062] Step B: Detection

[0063] As Figure 4 shown, remove the cover plate 1 and the mandrel 2, place the non-circular expanding ring seal 5 to be machined after external circle grinding on the step surface 41 inside the second outer ring 4, and detect the light transmittance of the gap 7 between the external circle of the non-circular expanding ring seal 5 to be machined and the inner circle of the second outer ring 4;

[0064] If its light transmittance meets the preset requirements, execute Step 5;

[0065] If its light transmittance does not meet the preset requirements, remove the second outer ring 4 and return to Step 2 until its light transmittance meets the preset requirements.

[0066] Step 5: As Figure 5 shown, remove the cover plate 1 and the mandrel 2, place the non-circular expanding ring seal 5 to be machined after external circle grinding inside the second outer ring 4, perform equal-pipe inner circle wire cutting on the non-circular expanding ring seal 5 to be machined with a preset width, remove the second outer ring 4, and complete the machining of the non-circular expanding ring seal 5.

[0067] Note:

[0068] 1. The inner hole size of the first outer ring 3 is slightly larger than the required size of the non-circular expanding ring seal 5 to be machined, ensuring that there is a margin during each grinding;

[0069] 2. The outer diameter dimensions of the cover plate 1 and the mandrel 2 are required to be smaller than the outer diameter dimension of the non-circular expanding ring seal 5 to be machined, ensuring that its outer circumference is exposed during grinding;

[0070] 3. The number of bolts 6 is required to be 8 - 16, ensuring that the non-circular expanding ring seal 5 to be machined will not rebound after the bolts 6 are tightened;

[0071] In this embodiment, since the non-circular expanding ring seal 5 to be machined is open, grinding will cause the downward amount of its outer circumference to be inconsistent, making its overall width uneven. The wire cutting process is positioned by the outer circle of the non-circular expanding ring seal 5 to be machined, ensuring concentricity of the inner and outer circles and uniform width.

[0072] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described.

Claims

1. A processing device for a non-circular expansion ring type sealing ring, characterized in that: It includes a cover plate (1), a mandrel (2), a first outer ring (3) and a second outer ring (4); The mandrel (2) is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type sealing ring (5) to be processed in the working state, and it is used to be installed on the bottom surface of the non-circular expansion ring type sealing ring (5) to be processed; The cover plate (1) is circular, and its diameter is smaller than the outer diameter of the non-circular expansion ring type sealing ring (5) in the working state, and it is used to be installed on the top surface of the non-circular expansion ring type sealing ring (5) to be processed and is detachably connected to the mandrel (2), so as to clamp the non-circular expansion ring type sealing ring (5) to be processed between the mandrel (2) and the cover plate (1); The first outer ring (3) is used to be sleeved outside the mandrel (2), the cover plate (1) and the non-circular expansion ring type sealing ring (5) to be processed before external cylindrical grinding, so as to limit the external expansion action of the non-circular expansion ring type sealing ring (5) to be processed; The second outer ring (4) is used to be sleeved outside the non-circular expansion ring type sealing ring (5) to be processed, so as to detect the non-circular expansion ring type sealing ring (5) to be processed and perform internal circular wire cutting.

2. The non-circular expansion ring type sealing ring processing device according to claim 1, wherein: An inward first annular protrusion (31) is provided on the inner wall of the first outer ring (3) around its circumference; The inner wall of the first annular protrusion (31) is an annular limiting surface, which is used to limit the outer circle of the non-circular expansion ring type sealing ring (5) to be processed.

3. The non-circular expansion ring type sealing ring processing device according to claim 2, wherein: The inner hole of the second outer ring (4) is a stepped hole, and its step surface (41) faces upward, which is used to carry the non-circular expansion ring type sealing ring (5) to be processed.

4. The non-circular expansion ring type sealing ring processing device according to claim 3, wherein: A second annular protrusion (21) is provided on the outer peripheral surface of the mandrel (2), and its thickness in the radial direction of the mandrel (2) is greater than the thickness of the first annular protrusion (31) in the radial direction of the first outer ring (3), and the height of the second annular protrusion (21) is lower than the height of the first annular protrusion (31).

5. The non-circular expansion ring type sealing ring processing device according to any one of claims 1-4, wherein: The cover plate (1) and the mandrel (2) are detachably connected by a plurality of bolts (6) correspondingly arranged at the middle hole of the non-circular expansion ring type sealing ring (5) to be processed.

6. The non-circular expansion ring type sealing ring processing device according to claim 5, wherein: The plurality of bolts (6) are evenly distributed around the circumference of the cover plate (1).

7. The non-circular expansion ring type sealing ring processing device according to claim 6, wherein: The number of the bolts (6) is 8 to 16.

8. A processing method for a non-circular expansion ring type sealing ring, which uses the non-circular expansion ring type sealing ring processing device described in any one of claims 1-7, and is characterized in that, It includes the following steps: Step 1: Rough turning of the blank of the non-circular expansion ring type sealing ring, end face grinding, end face lapping, external cylindrical milling and opening wire cutting are carried out in sequence to form the non-circular expansion ring type sealing ring (5) to be processed; Step 2: After tightening the to-be-processed non-circular expansion ring seal (5), perform limit assembly within the inner circle of the first outer ring (3). The to-be-processed non-circular expansion ring seal (5) freely expands until its outer circle abuts against the inner circle of the first outer ring (3). Then, fit the first outer ring (3) over the mandrel (2) so that the bottom surface of the to-be-processed non-circular expansion ring seal (5) contacts the top surface of the mandrel (2). Step 3: Cover the top surface of the to-be-processed non-circular expansion ring seal (5) with the cover plate (1), and detachably connect it to the mandrel (2), so that the to-be-processed non-circular expansion ring seal (5) is clamped and fixed between the cover plate (1) and the mandrel (2), and then remove the first outer ring (3). Step 4: Grind the outer circle of the to-be-processed non-circular expansion ring seal (5) clamped between the cover plate (1) and the mandrel (2). Step 5: Remove the cover plate (1) and the mandrel (2), place the to-be-processed non-circular expansion ring seal (5) after outer circle grinding in the second outer ring (4), perform inner circle wire cutting on the to-be-processed non-circular expansion ring seal (5) with a preset width, and then remove the second outer ring (4) to complete the processing of the non-circular expansion ring seal (5).

9. The machining method of the non-circular expansion ring type sealing ring according to claim 8, characterized in that, Before Step 5 and after Step 4, it also includes: Step A: Repeat grinding Remove the cover plate (1) and the mandrel (2), rotate the to-be-processed non-circular expansion ring seal (5) to change its position between the cover plate (1) and the mandrel (2), and then return to Step 2 until the preset return times are completed; and each time outer circle grinding is performed, ensure that there is a margin on the outer circle of the to-be-processed non-circular expansion ring seal (5).

10. The non-circular expansion ring type sealing ring processing method according to claim 8 or 9, characterized in that, Before Step 5, it also includes: Step B: Detection Remove the cover plate (1) and the mandrel (2), place the to-be-processed non-circular expansion ring seal (5) after outer circle grinding on the step surface (41) within the second outer ring (4), and detect the light transmittance of the gap (7) between the outer circle of the to-be-processed non-circular expansion ring seal (5) and the inner circle of the second outer ring (4). If its light transmittance meets the preset requirements, then execute Step 5; If its light transmittance does not meet the preset requirements, then remove the second outer ring (4) and return to Step 2 until its light transmittance meets the preset requirements.

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