CN113878739B - Machining tool and machining method for embedded sealing ring - Google Patents
Machining tool and machining method for embedded sealing ring Download PDFInfo
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- CN113878739B CN113878739B CN202111270678.8A CN202111270678A CN113878739B CN 113878739 B CN113878739 B CN 113878739B CN 202111270678 A CN202111270678 A CN 202111270678A CN 113878739 B CN113878739 B CN 113878739B
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- 238000007789 sealing Methods 0.000 title claims abstract description 87
- 238000003754 machining Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 25
- 239000002184 metal Substances 0.000 claims abstract description 81
- 238000012545 processing Methods 0.000 claims abstract description 42
- 238000013461 design Methods 0.000 claims abstract description 26
- 238000003672 processing method Methods 0.000 claims abstract description 8
- 239000007769 metal material Substances 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 57
- 238000007906 compression Methods 0.000 claims description 52
- 230000006835 compression Effects 0.000 claims description 51
- 230000008569 process Effects 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 17
- 238000007514 turning Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 101150103383 phiA gene Proteins 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/04—Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/16—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by turning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a processing technology of an embedded sealing ring, in particular to a processing tool and a processing method of the embedded sealing ring, which are used for solving the defects that the existing embedded sealing ring press-fitting technology has the defects of insufficient dimensional accuracy and form and position tolerance accuracy, poor product qualification rate and poor end face sealing reliability caused by the fact that the design requirements cannot be met due to the fact that the performance of a metal material is changed, and accelerating oxidation corrosion of the surface of a metal ring seat so as to reduce the end face sealing reliability. The machining tool for the embedded sealing ring comprises a clamp seat, an axial positioning device and a radial positioning device; the machining tool has the functions of radial clearance compensation and axial positioning clamping, and can remarkably improve the size precision and form and position tolerance precision of the embedded sealing ring. Meanwhile, the invention also provides a processing method of the embedded sealing ring.
Description
Technical Field
The invention relates to a processing technology of an embedded sealing ring, in particular to a processing tool and a processing method of the embedded sealing ring.
Background
At present, an embedded seal ring structure is mostly adopted as an end face seal static ring of a liquid rocket engine, a graphite material is generally adopted as a non-metal seal ring piece, and meanwhile, metal materials such as S-07, 4J31 and the like are adopted as a metal ring seat, so that the non-metal seal ring and the metal ring seat are tightly combined together by virtue of acting force generated by radial deformation action during interference fit between the two materials. The embedded sealing ring structure not only can ensure good neutrality and effectively transfer torque, meets the requirements of high reliability of sealing under high-frequency impact and vibration, but also has the advantages of saving precious materials, reducing cost, being simple in structure, easy to process and manufacture and the like, and is widely applied to the fields of aviation, aerospace, petrochemical industry, nuclear energy and the like. However, due to the specificity of the embedded sealing ring structure, the deformation is necessarily caused by uneven stress distribution of the inner hole of the metal ring seat and the outer circle of the graphite ring after interference press fitting due to shape and position errors, so that the dimensional accuracy and shape and position tolerance are difficult to ensure, and the sealing performance of the embedded sealing ring is seriously affected.
Therefore, research and application of the embedded sealing ring processing technology become one of key technologies for restricting the sealing reliability of the end face of the liquid rocket engine, the embedded sealing ring processing technology not only can be used for improving the graphite turning corner breakage phenomenon, prolonging the service life of a cutter and reducing the quality problems of local trimming, fracturing and the like of graphite after press mounting, but also can greatly improve the dimensional precision and form and position tolerance precision of the embedded sealing ring, and remarkably improve the product qualification rate of the embedded sealing ring and the sealing performance reliability of the end face sealing.
The research of the existing embedded sealing ring processing technology mainly has the following defects:
(1) For the embedded seal ring press mounting technology, common press mounting modes comprise normal temperature press mounting and hot mounting, normal temperature press mounting is suitable for products with small interference, but when the press mounting interference exceeds 0.2mm and even reaches more than 0.4mm, obvious graphite trimming and even fracturing phenomena are generated after press mounting, the hot mounting is suitable for the embedded seal ring of which the metal ring seat is made of a material which is easy to expand when being heated, when the metal ring seat adopts metal with low linear expansion coefficient or similar low expansion alloy, the heating temperature of the metal ring seat needs to be high enough to meet the hot mounting requirement, and the higher heating temperature not only changes the performance of the metal material to cause the design requirement to be unsatisfied, but also accelerates the oxidation corrosion of the surface of the metal ring seat so as to reduce the reliability of end face seal;
(2) To mosaic seal ring processing frock, current axial clamping processing frock relies on the terminal surface location and carries out the clamping to mosaic seal ring through axial clamp plate, has avoided the radial clamping deformation problem that exists among the mosaic seal ring turning process, but because there is radial clearance between mosaic seal ring and the axial clamping processing frock for can't be to carrying out mosaic seal ring radial positioning, and then cause the hole of mosaic seal ring to be difficult to the alignment when turning finish machining, cause the hole of same batch mosaic seal ring to be poor at finish turning back roundness uniformity, very big reduction production efficiency and quality stability.
Disclosure of Invention
The invention aims to solve the defects that the existing embedded seal ring press mounting technology has the phenomenon of graphite local trimming and even fracturing, or the design requirement cannot be met due to the fact that the performance of a metal material is changed, and meanwhile, the oxidation corrosion of the surface of a metal ring seat is quickened so as to reduce the reliability of end face sealing, and the defects that the existing axial clamping processing tool has insufficient dimensional precision and form and position tolerance precision and poor product qualification rate and end face sealing reliability, and provides the processing tool and the processing method of the embedded seal ring.
In order to solve the defects existing in the prior art, the invention provides the following technical solutions:
the utility model provides a processing frock of mosaic seal ring which characterized in that: comprises a clamp seat, an axial positioning device and a radial positioning device;
the clamping part connected with the machine tool is arranged at one end of the clamp seat, the axial blind hole is formed at the other end of the clamp seat, the axial blind hole comprises a first axial hole, a second axial hole and a third axial hole which are sequentially formed from inside to outside and have gradually increased diameters, a first step end face is formed between the first axial hole and the second axial hole, a second step end face is formed between the second axial hole and the third axial hole, the to-be-machined embedded seal ring is in close contact with the second step end face through the metal ring seat end face of the to-be-machined embedded seal ring to realize axial positioning, and graphite ring sheets of the to-be-machined embedded seal ring are positioned in the second axial hole and the third axial hole and keep a gap with the first step end face; n open grooves with the width w and the depth h are uniformly formed in the circumferential direction of the axial Kong Chukou end of the clamp seat (n is more than or equal to 8);
the axial positioning device is positioned at the outlet end of the third axial hole and comprises an axial compression ring and an opening compression ring; one end of the axial compression ring is connected with the side wall of the clamp seat, and the other end of the axial compression ring is tightly contacted with the opening compression ring; the opening pressing ring is arranged in the third axial hole, the outer annular wall of the opening pressing ring is matched with the inner diameter of the third axial hole, the opening pressing ring is pressed on the other end face of the metal ring seat of the embedded sealing ring to be processed by moving along the axial direction, the embedded sealing ring to be processed is axially positioned, a through groove with the width u is formed in the opening pressing ring along the axial direction, and u= (n+1) xw;
the radial positioning device is sleeved on the clamp seat and is in close contact with the side wall of the clamp seat, and the radial positioning device moves along the axial direction to adjust the inner diameter of the axial blind hole through the opening groove and the through groove.
Further, the axial clamping ring comprises a compression nut and a connecting ring which is integrated with the compression nut and has a U-shaped radial section, the compression nut is in threaded connection with the side wall of the clamp seat, and the other end of the connecting ring is in close contact with the opening clamping ring.
Further, the radial positioning device comprises a radial compression ring arranged on one side close to the clamping part and a travel nut which is arranged on one side close to the axial positioning device and is in threaded connection with the side wall of the clamp seat, and the radial compression ring is in tight contact with the travel nut.
Further, the outer wall of the clamp seat is a conical surface with a cone angle which is larger than or equal to 30 degrees and gradually expands from the outlet end of the third axial hole, and the inner wall of the radial compression ring is a conical surface matched with the outer wall of the clamp seat.
Further, the number n of the open grooves and the outer diameter phi D of the metal ring seat of the embedded sealing ring to be processed m The relationship is as follows: when phi D m 60mm or more, n or more is 4 or less and 6 or less; when 60mm is less than or equal to phi D m 120mm or more, n or more is 6 or less and 8 or less; when phi D m ≥120mm，n≥8；
The width w of the n open grooves and the outer diameter phi D of the metal ring seat of the embedded sealing ring to be processed m The relationship is as follows: when phi D m Less than or equal to 30mm, w less than or equal to 1mm; when 30mm < phi DmLess than or equal to 60mm, w=1.5 mm; when 60mm < phi Dm is less than or equal to 120mm, w=2mm; when phi Dm is larger than or equal to 120mm, w is larger than or equal to 2mm.
The depth of the n open grooves is h and the depth h of the axial blind hole of the clamp seat Z The depth g of the second step end face of the clamp seat is as follows: 1.1Xg < h.ltoreq.0.75Xh Z 。
Meanwhile, the invention also provides a processing method of the embedded sealing ring, which is characterized by comprising the following steps:
step (1): stage of preparation for production
Processing an inner hole of the metal ring seat of the embedded sealing ring according to design requirements, simultaneously processing the outer diameter of the metal ring seat of the embedded sealing ring according to process requirements, numbering the processed metal ring seat, and recording an actually measured value phi A of the inner hole diameter of each metal ring seat after processing;
step (2): stage for processing graphite ring piece of embedded seal ring
(2.1) determining the minimum interference C of interference fit of the graphite ring piece outer diameter and the metal ring seat inner hole diameter according to the interference index of the design requirement min And maximum interference C max ；
(2.2) processing graphite ring sheets according to design requirements by adopting a turning mode according to actual measurement values phi A of inner hole diameters of metal ring seats with different numbers, and processing inner holes and end faces of the graphite ring sheets according to process requirements, so as to ensure that the actual measurement values phi B of outer diameters of the graphite ring sheets meet phi A+C min ≤ΦB≤ΦA+C max Reserving subsequent machining allowance on the inner holes and the end faces of the graphite ring sheets;
step (3): stage for preparing hot press mounting of inlaid sealing ring
(3.1) calculating the heating temperature t of the metal ring seat:
t＝0.8×t h
wherein t is h The low-temperature tempering temperature of the metal material used for the metal ring seat;
(3.2) calculating the press fitting force F of the graphite ring sheet:
wherein k is a press-fit safety coefficient, F s For maximum static pressure born by graphite ring sheet, F j Is the product of the maximum static pressure born by the metal ring seat;
step (4): inlay type sealing ring hot press mounting stage
Putting the metal ring seat into a high-temperature oven, heating to a heating temperature t, taking out, immediately putting the metal ring seat on a press mounting support tool on a lower press plate of a press machine, and pressing down the upper press plate of the press machine according to a preset press mounting force F and a press mounting speed v to enable graphite ring sheets to be attached to the bottom of the metal ring seat, and finishing press mounting;
step (5): natural aging stage of inlaid seal ring
Paving lens paper at the bottom of the embedded sealing ring after press fitting, and horizontally placing the lens paper in a clean drying box for 24 hours in a single layer;
step (6): finishing stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat of the embedded sealing ring to the design requirement size phi D h And then loading the embedded sealing ring into a processing tool for turning an inner hole of the graphite ring sheet, and finally grinding the sealing end surface of the embedded sealing ring, wherein when the size and the form and position tolerance of the embedded sealing ring meet the design requirements, the processing is completed.
Further, in step (3.2), the maximum static pressure F to which the graphite is subjected s ：
F s ＝σ 1 ×S 1 ≤σ bc ×S 1
Wherein sigma 1 For maximum static load borne by graphite ring sheet S 1 For pressing the actual bearing area sigma of the graphite ring sheet bc The compression strength of the graphite ring sheet is;
the maximum static pressure F born by the metal ring seat j ：
F j ＝σ 2 ×S 2 ≤σ b0.2 ×S 2
Wherein sigma 2 For maximum static load borne by the metal ring seat S 2 For press-fitting the actual bearing area sigma of the metal ring seat b0.2 Is a metal ringSeat compressive strength.
Further, in the step (3.2), the press-fitting safety coefficient k is more than or equal to 0.10 and less than or equal to 0.12, and when the actual measured value phi B of the outer diameter of the graphite ring sheet is more than 60mm or the minimum interference C min > 0.15mm, k=0.10; when phi B is more than or equal to 30mm and less than or equal to 60mm or the maximum interference is more than or equal to 0.12mm and less than or equal to C max Less than or equal to 0.15mm, k=0.11; when phi B is less than 30mm or the maximum interference C max ＜0.12mm，k＝0.12。
Further, in the step (2) and the step (6), the tool rake angle γ used for the turning process 0 Not less than 0 degree, and the radius of the nose fillet is 0.2-0.4 mm; the specific parameters of the turning process are as follows: the cutting speed is set to be 200m/min, the cutting depth is set to be 0.05-0.10 mm, and the feed amount is set to be 0.030-0.035 mm/r.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention discloses a processing tool for an embedded sealing ring, which can quantitatively shrink the inner diameter of an axial blind hole of a clamp seat to be just contacted with the side wall of a metal ring seat of the embedded sealing ring through quantitative movement of a radial positioning device on the premise that the radial direction of the embedded sealing ring is not stressed or stressed slightly but is insufficient to deform the embedded sealing ring radially, and simultaneously realize axial positioning and clamping functions through the clamp seat and the axial positioning device, and also realize radial clearance compensation and axial positioning clamping functions, thereby obviously improving the dimensional precision and form and position tolerance precision of the embedded sealing ring and providing references for processing and tool design of similar structural products which are not suitable for adopting a radial clamping positioning mode.
(2) The invention further discloses a key design parameter selection principle of the processing tool of the embedded sealing ring, which comprises a quantitative selection principle of the number of open grooves with seats and the width of the open grooves, and a quantitative selection principle of the width of the through grooves of the open pressing ring; the design parameter selection principle is beneficial to the standardized design of the similar structure tool, and reduces the design period of the embedded sealing ring processing tool, thereby improving the production efficiency of the embedded sealing ring on the end face of the liquid rocket engine.
(3) The invention discloses a processing method of an embedded sealing ring, which quantitatively provides selection basis of pressing force, heating temperature and pressing safety coefficient in the hot pressing process, can better adapt to the processing of the embedded sealing ring with different interference requirements, simultaneously ensures that the material performance of a metal ring seat meets the design index, reduces the oxidation corrosion of the surface of the metal ring seat, and reduces the quality problems of graphite local trimming, fracturing and the like after the pressing; in addition, the method provides a quantitative selection principle of the front angle, the nose fillet, the cutting speed, the cutting depth and the feed amount of the cutter for turning, can effectively improve the graphite turning corner breakage phenomenon, prolongs the service life of the cutter, and greatly improves the qualification rate of products.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of the portion Q of FIG. 1;
FIG. 3 is a schematic view of the clamp base of the embodiment of FIG. 1;
FIG. 4 is a schematic view of the A-A structure of FIG. 3;
FIG. 5 is a schematic view of the embodiment of FIG. 1 illustrating an open compression ring;
the reference numerals are explained as follows: 1-a clamp seat, 11-a clamping part and 12-an open slot; 2-axial positioning device, 21-compression nut, 22-opening compression ring and 23-through groove; 3-radial positioning device, 31-radial compression ring, 32-stroke nut; 4-an embedded sealing ring to be processed, 41-a metal ring seat and 42-a graphite ring piece.
Detailed Description
The invention is further described below with reference to the drawings and exemplary embodiments.
Referring to fig. 1, a machining tool for an embedded seal ring comprises a fixture seat 1, an axial positioning device 2 and a radial positioning device 3; the clamping part 11 connected with the machine tool is arranged at one end of the clamp seat 1, the axial blind hole is arranged at the other end of the clamp seat, the axial blind hole comprises a first axial hole, a second axial hole and a third axial hole which are sequentially arranged from inside to outside and have gradually increased diameters, a first step end face is formed between the first axial hole and the second axial hole, a second step end face is formed between the second axial hole and the third axial hole, the to-be-machined embedded seal ring 4 is in close contact with the second step end face through the end face of the metal ring seat 41 to realize axial positioning, and the graphite ring piece 42 of the to-be-machined embedded seal ring 4 is positioned in the second axial hole and the third axial hole and keeps a gap with the first step end face; the fixture seat 1 is positioned at the outlet end of the third axial hole, and n open grooves 12 with the width w and the depth h are uniformly formed in the circumferential direction (n is more than or equal to 8).
The axial positioning device 2 is positioned at the outlet end of the third axial hole and comprises an axial compression ring and an opening compression ring 22; the axial compression ring comprises a compression nut 21 and a connecting ring which is integrated with the compression nut 21 and has a U-shaped radial section, the compression nut 21 is in threaded connection with the side wall of the clamp seat 1, and the other end of the connecting ring is in close contact with the opening compression ring 22; the opening compression ring 22 is arranged in the third axial hole, the outer annular wall of the opening compression ring is matched with the inner diameter of the third axial hole, the opening compression ring 22 is compressed on the other end face of the metal ring seat 41 of the embedded type sealing ring 4 to be processed by moving along the axial direction, the embedded type sealing ring 4 to be processed is axially positioned, a through groove 23 with the width u is formed in the opening compression ring along the axial direction, and u= (n+1) xw is formed, so that when all the n opening grooves 12 are closed, gaps can still be reserved in the through groove 23 of the opening compression ring 22, and the abnormal closing of the opening grooves 12 of the clamp seat 1 caused by the closing of the through groove 23 of the opening compression ring 22 is avoided.
The radial positioning device 3 is sleeved on the clamp seat 1 and is tightly contacted with the side wall of the clamp seat 1; the radial positioning device 3 comprises a radial compression ring 31 arranged near one side of the clamping part 11 and a travel nut 32 which is arranged near one side of the axial positioning device 2 and is in threaded connection with the side wall of the clamp seat 1, the radial compression ring 31 is in close contact with the travel nut 32, and the radial compression ring 31 moves along with the Cheng Luomu 32 along the axial direction and adjusts the inner diameter of the axial blind hole through the open groove 12 and the through groove 23.
The outer wall of the clamp seat 1 is a conical surface with a cone angle beta gradually expanding from the outlet end of the third axial hole, and the inner wall of the radial compression ring 31 is a conical surface with a cone angle beta matched with the outer wall of the clamp seat 1; the radial clearance delta between the inner wall of the axial blind hole of the clamp seat 1 and the side wall of the embedded sealing ring 4 to be processed and the axial moving distance L of the radial positioning device 3 meet L=delta multiplied by cotbeta; simultaneously, radial clearance delta and maximum value phi M of axial blind hole diameter of fixture seat 1 and embedded seal after grindingThe outer diameter dimension phi D of the ring metal ring seat h Satisfy δ=Φm- Φd h The method comprises the steps of carrying out a first treatment on the surface of the The clamping stagnation in the screwing process of the compression nut 21 and the stroke nut 32 caused by the shrinkage of the outer diameter of the clamp seat 1 is avoided, and coarse threads are adopted for both the compression nut and the stroke nut; beta value can be reduced when the control accuracy requirement of the radial clearance delta is higher, otherwise, beta value can be increased when the control accuracy requirement of the radial clearance delta is lower, but beta is less than or equal to 30 degrees; in this embodiment, β=15°.
In order to ensure that the mosaic sealing rings 4 to be processed with different diameter sizes have good neutrality and uniformity in the radial adjustment process, the number n of the open grooves 12 and the outer diameter phi D of the metal ring seat of the mosaic sealing ring 4 to be processed m The relationship is as follows: when phi D m 60mm or more, n or more is 4 or less and 6 or less; when 60mm is less than or equal to phi D m 120mm or more, n or more is 6 or less and 8 or less; when phi D m ≥120mm，n≥8。
In order to ensure that the holder 1 has good resilience during radial adjustment, the width w of the n open grooves 12 and the outer diameter Φd of the metal ring holder of the insert seal ring 4 to be machined m The relationship is as follows: when phi D m Less than or equal to 30mm, w less than or equal to 1mm; when 30mm < phi Dm is less than or equal to 60mm, w=1.5 mm; when 60mm < phi Dm is less than or equal to 120mm, w=2mm; when phi Dm is larger than or equal to 120mm, w is larger than or equal to 2mm.
In order to facilitate the design of the clamp seat 1 and ensure good rebound resilience of the clamp seat 1 in the radial adjustment process, the depth of the n open grooves 12 is h and the depth h of the axial blind hole of the clamp seat 1 Z The depth g of the second step end face of the clamp seat 1 is as follows: 1.1Xg < h.ltoreq.0.75Xh Z 。
In the embodiment, the outer diameter phiD of the metal ring seat of the embedded seal ring 4 to be processed m The fixture seat 1 is located at the outlet end of the third axial hole, and is provided with 6 open grooves 12 with a width of 1.5mm and a depth h uniformly in the circumferential direction.
Meanwhile, the invention also provides a processing method of the embedded sealing ring, which comprises the following steps:
step (1): stage of preparation for production
Machining the inner hole of the metal ring seat 41 of the embedded sealing ring according to design requirements, and machining the outer diameter of the metal ring seat 41 of the embedded sealing ring according to process requirements, wherein goldThe measured value phiA of the inner diameter of the ring seat 41 meets the design size requirement, while the measured value phiD of the outer diameter of the metal ring seat 41 q The requirement of the subsequent processing allowance reserved by the process is met; numbering the machined metal ring seats 41, and recording the actual measurement value phi A of the inner hole diameter of each machined metal ring seat 41;
step (2): stage 42 of processing graphite ring piece of inlaid seal ring
(2.1) determining the minimum interference C of interference fit of the graphite ring piece 42 and the metal ring seat 41 according to the interference index of the outer diameter of the graphite ring piece and the inner hole diameter of the metal ring seat 41 required by design min And maximum interference C max ；
(2.2) according to the actual measured value phiA of the inner hole diameter of the metal ring seat 41 with different numbers, adopting a turning processing mode to process the graphite ring sheet 42 according to the design requirement, and then processing the inner hole and the end face of the graphite ring sheet 42 according to the process requirement, so as to ensure that the actual measured value phiB of the outer diameter of the graphite ring sheet 42 meets phiA+C min ≤ΦB≤ΦA+C max Reserving subsequent machining allowance on the inner hole and the end face of the graphite ring piece 42;
step (3): stage for preparing hot press mounting of inlaid sealing ring
(3.1) calculating the heating temperature t of the metal ring seat 41:
t＝0.8×t h
wherein t is h The low temperature tempering temperature of the metal material used for the metal ring seat 41;
(3.2) calculating the press-fitting force F of the graphite ring sheets 42:
wherein k is a press-fit safety coefficient, and is more than or equal to 0.10 and less than or equal to 0.12, and when the actual measured value phi B of the outer diameter of the graphite ring sheet 42 is more than 60mm or the minimum interference C min > 0.15mm, k=0.10; when phi B is more than or equal to 30mm and less than or equal to 60mm or the maximum interference is more than or equal to 0.12mm and less than or equal to C max Less than or equal to 0.15mm, k=0.11; when phi B is less than 30mm or the maximum interference C max ＜0.12mm，k＝0.12；
F s For the maximum static pressure borne by the graphite ring sheets 42, satisfy F s ＝σ 1 ×S 1 ≤σ bc ×S 1 Wherein σ is 1 For maximum static load, S, carried by the graphite ring segments 42 1 Actual bearing area sigma for press fitting of graphite ring sheets 42 bc Is the compressive strength of the graphite ring sheet 42;
F j is the product of the maximum static pressure born by the metal ring seat 41 and satisfies F j ＝σ 2 ×S 2 ≤σ b0.2 ×S 2 Wherein σ is 2 For maximum static load borne by the metal ring seat 41, S 2 The actual bearing area sigma of the metal ring seat 41 is pressed b0.2 The compressive strength of the metal ring seat 41;
step (4): inlay type sealing ring hot press mounting stage
Putting the metal ring seat 41 into a high-temperature oven, heating to a heating temperature t, taking out, immediately putting the metal ring seat 41 on a press mounting support tool on a lower press plate of a press, and pressing down the upper press plate of the press according to a preset press mounting force F and a press mounting speed v to enable the graphite ring sheets 42 to be attached to the bottom of the metal ring seat 41, so that press mounting is finished;
step (5): natural aging stage of inlaid seal ring
Paving lens paper at the bottom of the embedded sealing ring after press fitting, and horizontally placing the lens paper in a clean drying box for 24 hours in a single layer;
step (6): finishing stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat 41 of the embedded seal ring to the design required dimension phiD h And then loading the embedded sealing ring into the processing tool for inner hole turning processing, and finally grinding the sealing end surface of the embedded sealing ring, wherein when the size and form and position tolerance of the embedded sealing ring meet the design requirement, the processing is completed.
In order to improve the angle collapse phenomenon in the graphite cutting process, simultaneously improve the service life of the cutter and reduce the production cost, in the step (2) and the step (6), the turning process meets the front angle gamma of the cutter 0 Not less than 0 degree, the radius of the tool nose fillet is 0.2-0.4 mm, the cutting speed is set to 200m/min, the cutting depth is set to 0.05-0.10 mm, and the feed amount is set to 0.030-0.035 mm/r; in this embodiment, the tool rake angle γ 0 =0°, nose circleThe angle radius was 0.2mm, the cutting speed was set to 200m/min, the cutting depth was set to 0.05mm, and the feed amount was set to 0.030mm/r.
The foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.
Claims (9)
1. The utility model provides a processing frock of mosaic seal ring which characterized in that: comprises a clamp seat (1), an axial positioning device (2) and a radial positioning device (3);
one end of the fixture seat (1) is provided with a clamping part (11) connected with a machine tool, the other end of the fixture seat is provided with an axial blind hole, the axial blind hole comprises a first axial hole, a second axial hole and a third axial hole which are sequentially arranged from inside to outside and have gradually increased diameters, a first step end face is formed between the first axial hole and the second axial hole, a second step end face is formed between the second axial hole and the third axial hole, the to-be-machined embedded sealing ring (4) is in close contact with the second step end face through the end face of the metal ring seat (41) to realize axial positioning, and graphite ring sheets (42) of the to-be-machined embedded sealing ring (4) are positioned in the second axial hole and the third axial hole and keep a gap with the first step end face; the fixture seat (1) is circumferentially and uniformly provided with n open grooves (12) with width w and depth h at the outlet end of the axial blind hole;
the axial positioning device (2) is positioned at the outlet end of the third axial hole and comprises an axial compression ring and an opening compression ring (22); one end of the axial compression ring is connected with the side wall of the clamp seat (1), and the other end of the axial compression ring is tightly contacted with the opening compression ring (22); the opening compression ring (22) is arranged in the third axial hole, the outer annular wall of the opening compression ring is matched with the inner diameter of the third axial hole, the opening compression ring (22) is compressed on the other end face of the metal ring seat (41) of the embedded type sealing ring (4) to be processed by moving along the axial direction, the embedded type sealing ring (4) to be processed is axially positioned, a through groove (23) with the width of u is formed in the opening compression ring along the axial direction, and u= (n+1) x w;
the radial positioning device (3) is sleeved on the clamp seat (1) and is in close contact with the side wall of the clamp seat (1), the radial positioning device (3) moves along the axial direction, and the inner diameter of the axial blind hole is adjusted through the open slot (12) and the through slot (23).
2. The machining tool for the mosaic seal ring according to claim 1, wherein: the axial compression ring comprises a compression nut (21) and a connecting ring with a U-shaped radial section and integrated with the compression nut (21), the compression nut (21) is in threaded connection with the side wall of the clamp seat (1), and the other end of the connecting ring is in tight contact with the opening compression ring (22).
3. The machining tool for an embedded seal ring according to claim 1 or 2, wherein: the radial positioning device (3) comprises a radial compression ring (31) arranged on one side close to the clamping part (11) and a travel nut (32) which is arranged on one side close to the axial positioning device (2) and is in threaded connection with the side wall of the clamp seat (1), and the radial compression ring (31) is in tight contact with the travel nut (32).
4. A machining tool for an embedded seal ring according to claim 3, wherein: the outer wall of the clamp seat (1) is a conical surface with a cone angle which is larger than or equal to 30 degrees and gradually expands from the outlet end of the third axial hole, and the inner wall of the radial compression ring (31) is a conical surface which is matched with the outer wall of the clamp seat (1).
5. The machining tool for the mosaic seal ring according to claim 4, wherein: the number n of the open grooves (12) and the outer diameter phi D of the metal ring seat of the embedded sealing ring (4) to be processed m The relationship is as follows: when phi D m 60mm or more, n or more is 4 or less and 6 or less; when 60mm is less than or equal to phi D m 120mm or more, n or more is 6 or less and 8 or less; when phi D m ≥120mm,n≥8；
The width w of the n open grooves (12) and the outer diameter phi D of the metal ring seat of the embedded sealing ring (4) to be processed m The relationship is as follows: when phi D m ≤30mm，wLess than or equal to 1mm; when the phi Dm is more than 30mm and less than or equal to 60mm, w=1.5 mm; when 60mm < phi Dm is less than or equal to 120mm, w=2 mm; when phi Dm is more than or equal to 120mm, w is more than or equal to 2mm;
the depth h of the n open grooves (12) and the depth h of the axial blind hole of the clamp seat (1) Z And the depth g of the second step end face of the clamp seat (1) is as follows: 1.1Xg < h.ltoreq.0.75Xh Z 。
6. The processing method of the embedded sealing ring is characterized by comprising the following steps of:
step (1): stage of preparation for production
Processing an inner hole of the embedded seal ring metal ring seat (41) according to design requirements, simultaneously processing the outer diameter of the embedded seal ring metal ring seat (41) according to process requirements, numbering the processed metal ring seat (41), and recording an actually measured value phi A of the inner hole diameter of each metal ring seat (41) after processing;
step (2): stage of processing graphite ring piece (42) of inlaid seal ring
(2.1) determining the minimum interference C of interference fit of the graphite ring piece (42) and the metal ring seat (41) according to the interference index of the outer diameter of the graphite ring piece and the inner hole diameter of the metal ring seat (41) required by design min And maximum interference C max ；
(2.2) processing the graphite ring sheet (42) according to design requirements by adopting a turning mode according to actual measurement values phi A of inner hole diameters of the metal ring seats (41) with different numbers, and then processing inner holes and end faces of the graphite ring sheet (42) according to process requirements, so as to ensure that the actual measurement value phi B of the outer diameter of the graphite ring sheet (42) meets phi A+C min ≤ФB≤ФA+C max Reserving subsequent machining allowance on an inner hole and an end face of the graphite ring piece (42);
step (3): stage for preparing hot press mounting of inlaid sealing ring
(3.1) calculating the heating temperature t of the metal ring seat (41):
t＝0.8×t h
wherein t is h The low temperature tempering temperature of the metal material used for the metal ring seat (41);
(3.2) calculating the press-fitting force F of the graphite ring sheet (42):
wherein k is a press-fit safety coefficient, F s For maximum static pressure, F, borne by the graphite ring sheets (42) j Is the product of the maximum static pressure born by the metal ring seat (41);
step (4): inlay type sealing ring hot press mounting stage
The metal ring seat (41) is placed into a high-temperature oven to be heated to a heating temperature t and then taken out, then the metal ring seat (41) is immediately placed on a press mounting support tool on a lower press plate of a press, the upper press plate of the press presses down according to a preset press mounting force F and a preset press mounting speed v to enable graphite ring sheets (42) to be attached to the bottom of the metal ring seat (41), and press mounting is finished;
step (5): natural aging stage of inlaid seal ring
Paving lens paper at the bottom of the embedded sealing ring after press fitting, and horizontally placing the lens paper in a clean drying box for 24 hours in a single layer;
step (6): finishing stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat (41) of the embedded seal ring to the design required dimension phi D h And then loading the embedded sealing ring into the processing tool of claim 1 for turning the inner hole of the graphite ring sheet (42), and finally grinding the sealing end surface of the embedded sealing ring, wherein when the size and form and position tolerance of the embedded sealing ring meet the design requirement, the processing is completed.
7. The method for machining the embedded sealing ring according to claim 6, wherein:
in step (3.2), the maximum static pressure F to which the graphite is subjected s ：
F s ＝σ 1 ×S 1 ≤σ bc ×S 1
Wherein sigma 1 For maximum static load borne by the graphite ring sheet (42), S 1 The actual bearing area sigma of the press fitting of the graphite ring sheets (42) bc Is the compressive strength of the graphite ring sheet (42);
the maximum static pressure born by the metal ring seat (41)F j ：
F j ＝σ 2 ×S 2 ≤σ b0.2 ×S 2
Wherein sigma 2 For maximum static load borne by the metal ring seat (41), S 2 The actual bearing area sigma of the metal ring seat (41) is pressed b0.2 Is the compressive strength of the metal ring seat (41).
8. The method for machining the embedded sealing ring according to claim 6, wherein: in the step (3.2), the press-fitting safety coefficient k is more than or equal to 0.10 and less than or equal to 0.12, and when the measured value phi B of the outer diameter of the graphite ring sheet (42) is more than 60mm or the minimum interference C min > 0.15mm, k=0.10; when phi B is more than or equal to 30mm and less than or equal to 60mm or the maximum interference is more than or equal to 0.12mm and less than or equal to C max Less than or equal to 0.15mm, k=0.11; when phi B is less than 30mm or the maximum interference C max ＜0.12mm,k＝0.12。
9. A method of manufacturing an insert seal ring according to any one of claims 6 to 8, wherein: in the step (2) and the step (6), the tool rake angle gamma used in the turning process 0 Not less than 0 degree, and the radius of the nose fillet is 0.2-0.4 mm; the specific parameters of the turning process are as follows: the cutting speed is set to be 200m/min, the cutting depth is set to be 0.05-0.10 mm, and the feed amount is set to be 0.030-0.035 mm/r.
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| CN107775379A (en) * | 2016-08-25 | 2018-03-09 | 常州飞盛塑料机械有限公司 | A kind of sealing ring frock |
| CN207710366U (en) * | 2018-01-08 | 2018-08-10 | 三峡大学 | A kind of processing tool of seal washer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1166343A (en) * | 1967-02-20 | 1969-10-08 | Saunders Valve Co Ltd | Seating Rings for Spherical Plug Cocks. |
| JP2013210041A (en) * | 2012-03-30 | 2013-10-10 | Nok Corp | Seal ring mounting fixture |
| CN204639656U (en) * | 2015-05-27 | 2015-09-16 | 湘电集团有限公司 | A kind of sealing ring turning tool |
| CN105562749A (en) * | 2016-02-29 | 2016-05-11 | 宝鸡石油机械有限责任公司 | Automotive clamping method for elastic sealing backing ring |
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| CN113878739A (en) | 2022-01-04 |
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