CN113878739A - Machining tool and machining method for embedded sealing ring - Google Patents
Machining tool and machining method for embedded sealing ring Download PDFInfo
- Publication number
- CN113878739A CN113878739A CN202111270678.8A CN202111270678A CN113878739A CN 113878739 A CN113878739 A CN 113878739A CN 202111270678 A CN202111270678 A CN 202111270678A CN 113878739 A CN113878739 A CN 113878739A
- Authority
- CN
- China
- Prior art keywords
- ring
- seat
- sealing ring
- axial
- embedded sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 128
- 238000003754 machining Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 22
- 239000002184 metal Substances 0.000 claims abstract description 83
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 41
- 238000013461 design Methods 0.000 claims abstract description 23
- 239000010439 graphite Substances 0.000 claims abstract description 10
- 239000007769 metal material Substances 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims description 45
- 230000006835 compression Effects 0.000 claims description 44
- 230000003068 static effect Effects 0.000 claims description 17
- 238000007514 turning Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000003672 processing method Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000009966 trimming Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010301 surface-oxidation reaction Methods 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 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
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention relates to an embedded sealing ring processing technology, in particular to a processing tool and a processing method for an embedded sealing ring, which are used for solving the defects that the existing embedded sealing ring press-fitting technology has the phenomena of local graphite trimming and even fracturing, or the performance of a metal material is changed, so that the design requirement cannot be met, and meanwhile, the oxidation corrosion of the surface of a metal ring seat is accelerated, so that the end face sealing reliability is reduced, and the defects of the existing axial clamping processing tool, such as insufficient dimensional precision and form and position tolerance precision, poor product qualification rate and poor end face sealing reliability. The processing tool for the embedded sealing ring comprises a clamp seat, an axial positioning device and a radial positioning device; the processing tool has the functions of radial clearance compensation and axial positioning clamping, and can remarkably improve the size precision and the 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 an embedded sealing ring processing technology, in particular to a processing tool and a processing method of an embedded sealing ring.
Background
At present, most of end face sealing static rings of liquid rocket engines adopt an embedded sealing ring structure, graphite materials are generally adopted as non-metal sealing ring sheets, metal materials such as S-07, 4J31 and the like are adopted as metal ring seats, and the non-metal sealing rings and the metal ring seats are tightly combined together by acting force generated by radial deformation during interference fit. The embedded sealing ring structure can ensure good centering property and effectively transmit torque, meets the requirement of high sealing reliability under high-frequency impact and vibration, has the advantages of precious material saving, cost reduction, simple structure, easiness in processing and manufacturing and the like, and is widely applied to the fields of aviation, aerospace, petrochemical industry, nuclear energy and the like. However, due to the particularity of the structure of the embedded sealing ring, the deformation of the metal ring seat and the graphite ring due to the uneven stress distribution after the interference press fitting is inevitably caused by the form and position errors of the inner hole of the metal ring seat and the outer circle of the graphite ring, so that the dimensional accuracy and the form and position tolerance are difficult to guarantee, and the sealing performance of the embedded sealing ring is seriously influenced.
Therefore, research and application of the processing technology of the embedded sealing ring become one of key technologies for restricting the end face sealing reliability of the liquid rocket engine, the embedded sealing ring can be used for improving the graphite turning corner collapse phenomenon, prolonging the service life of a cutter, reducing the quality problems of local trimming and fracturing of graphite after press mounting and the like, greatly improving the dimensional precision and form and position tolerance precision of the embedded sealing ring, and remarkably improving the product qualification rate of the embedded sealing ring and the sealing performance reliability of the end face sealing.
The research of the prior processing technology of the embedded sealing ring mainly has the following defects:
(1) for the press mounting technology of the embedded sealing ring, common press mounting modes comprise normal-temperature press mounting and hot mounting, the 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 sealing ring of which the metal ring seat is made of a material easy to expand under heat, when the metal ring seat is made of metal with low linear expansion coefficient or similar low-expansion alloy, the heating temperature is high enough to meet the hot mounting requirement, and the higher heating temperature not only can change the performance of the metal material to cause that the performance of the metal material cannot meet the design requirement, but also can accelerate the surface oxidation corrosion of the metal ring seat so as to reduce the reliability of end face sealing;
(2) to inserted sealing ring processing frock, current axial clamping processing frock relies on the terminal surface location and carries out the clamping to the inserted sealing ring through axial clamp plate, the radial clamping deformation problem that exists in the inserted sealing ring lathe work process has been avoided, nevertheless because there is radial clearance between inserted sealing ring and the axial clamping processing frock, make unable radial positioning to carrying out the inserted sealing ring, and then cause the hole of inserted sealing ring to be difficult to the alignment when the turning finish machining, cause the hole of same batch inserted sealing ring roundness uniformity behind the finish turning poor, very big reduction production efficiency and quality stability.
Disclosure of Invention
The invention aims to solve the problems that the prior press-fitting technology of the embedded sealing ring can not meet the design requirement due to the local trimming and even fracturing of graphite, or the performance of a metal material is changed, and the surface oxidation corrosion of a metal ring seat is accelerated so as to reduce the end face sealing reliability, and the prior axial clamping and processing tool has the defects of insufficient dimensional precision and form and position tolerance precision, poor product qualification rate and poor end face sealing reliability, and provides a processing tool and a processing method of the embedded sealing ring.
In order to solve the defects of the prior art, the invention provides the following technical solutions:
the utility model provides a processing frock of inserted sealing ring, its special character lies in: comprises a clamp seat, an axial positioning device and a radial positioning device;
the clamp comprises a clamp seat, a clamp seat and a clamp seat, wherein one end of the clamp seat is provided with a clamping part connected with a machine tool, the other end of the clamp 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, an embedded sealing ring to be processed is in close contact with the second step end face through the end face of a metal ring seat of the embedded sealing ring to be processed so as to realize axial positioning, and a graphite ring piece of the embedded sealing ring to be processed is positioned in the second axial hole and the third axial hole and keeps a gap with the first step end face; n open grooves (n is more than or equal to 8) with the width w and the depth h are uniformly arranged on the clamp seat in the circumferential direction at the outlet end of the axial hole;
the axial positioning device is positioned at the outlet end of the third axial hole and comprises an axial compression ring and an open 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 in close contact with the opening compression ring; the opening compression ring is arranged in the third axial hole, the outer ring wall of the opening compression ring is matched with the inner diameter of the third axial hole, the axial compression ring moves along the axial direction to tightly press the opening compression ring on the other end face of the metal ring seat of the mosaic sealing ring to be processed, the mosaic sealing ring to be processed is axially positioned, the opening compression ring is axially provided with a through groove with the width of u, and u is (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 open slot and the through slot.
Further, the axial compression 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 compression ring.
Furthermore, the radial positioning device comprises a radial compression ring arranged close to one side of the clamping part and a stroke nut which is arranged close to one side of the axial positioning device and is in threaded connection with the side wall of the clamp seat, and the radial compression ring is in close contact with the stroke nut.
Furthermore, the outer wall of the clamp seat is a conical surface with a taper angle of more than or equal to 30 degrees, which 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.
Furthermore, 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 processedmThe relationship is as follows: when phi DmN is not less than 60mm, n is not less than 4 and not more than 6; when the diameter is less than or equal to 60mmmN is not less than 120mm, n is not less than 6 and not more than 8; when phi Dm≥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 processedmThe relationship is as follows: when phi DmLess than or equal to 30mm, w is less than or equal to 1 mm; when the phi Dm is more than 30mm and less than or equal to 60mm, w is 1.5 mm; when phi Dm is more than 60mm and less than or equal to 120mm, w is 2 mm; when phi Dm is more than or equal to 120mm, w is more than or equal to 2 mm.
The depth of the n open grooves is h and the depth h of the axial blind hole of the clamp seatZAnd the end surface depth g of the second step of the clamp seat is as follows: h is more than 1.1 xg and less than or equal to 0.75 xhZ。
Meanwhile, the invention also provides a processing method of the embedded sealing ring, which is characterized by comprising the following steps:
step (1): preparation phase of production
Processing the inner hole of the embedded sealing ring metal ring seat according to the design requirement, simultaneously processing the outer diameter of the embedded sealing ring metal ring seat according to the process requirement, numbering the processed metal ring seats, and recording the measured value phi A of the diameter of the inner hole of each processed metal ring seat;
step (2): processing stage of graphite ring sheet of embedded sealing ring
(2.1) determining the minimum interference C of the graphite ring sheet outer diameter and the metal ring seat inner hole diameter according to the interference index of the graphite ring sheet outer diameter and the metal ring seat inner hole diameterminAnd maximum interference Cmax；
(2.2) according to the measured value of the diameters of the inner holes of the metal ring seats with different numbers, phi AMachining the graphite ring sheet according to design requirements by turning, and machining the inner hole and the end face of the graphite ring sheet according to process requirements to ensure that the measured value of the outer diameter phi B of the graphite ring sheet meets the requirements of phi A + Cmin≤ΦB≤ΦA+CmaxReserving subsequent machining allowance for the inner hole and the end face of the graphite ring sheet;
and (3): hot press mounting preparation stage for embedded sealing ring
(3.1) calculating the heating temperature t of the metal ring seat:
t＝0.8×th
wherein, thThe metal material used for the metal ring seat is tempered at a low temperature;
(3.2) calculating the press-fitting force F of the graphite ring sheet:
wherein k is press-fitting safety coefficient, FsMaximum static pressure to which the graphite ring sheet is subjected, FjIs the product of the maximum static pressure borne by the metal ring seat;
and (4): hot press mounting stage of embedded sealing ring
Placing the metal ring seat into a high-temperature oven, heating to a heating temperature t, taking out, immediately placing the metal ring seat on a press mounting support tool on a press pressing plate of a press, pressing the press pressing plate of the press downwards according to a preset press mounting force F and a press mounting speed v to enable the graphite ring sheet to be attached to the bottom of the metal ring seat, and finishing press mounting;
and (5): natural aging stage of embedded sealing ring
Laying lens paper at the bottom of the pressed embedded sealing ring, and flatly placing the embedded sealing ring in a clean drying box for 24 hours in a single layer manner;
and (6): finish machining stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat of the embedded sealing ring to the design required dimension phi DhThen, the embedded sealing ring is arranged in a processing tool for processing the inner hole of the graphite ring sheet by turning, and finally, the sealing end surface of the embedded sealing ring is ground until the size and the form and position tolerance of the embedded sealing ring meet the requirements of designAnd finishing processing when the requirement is met.
Further, in step (3.2), the graphite is subjected to a maximum static pressure Fs：
Fs＝σ1×S1≤σbc×S1
Wherein σ1Maximum static load, S, for the graphite ring sheet1The actual bearing area, sigma, of the graphite ring sheet is pressedbcThe compressive strength of the graphite ring sheet is shown;
maximum static pressure F borne by the metal ring seatj：
Fj＝σ2×S2≤σb0.2×S2
Wherein σ2Maximum static load, S, for the metal ring seat2For the actual bearing area, sigma, of the press-fitting of the metal ring seatb0.2The compressive strength of the metal ring seat is shown.
Further, in the step (3.2), the press-fitting safety coefficient k satisfies that k is more than or equal to 0.10 and less than or equal to 0.12, and when the measured value of the outer diameter phi B of the graphite ring sheet is more than 60mm or the minimum interference CminIs more than 0.15mm, k is 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 CmaxNot more than 0.15mm, k is 0.11; when phi B is less than 30mm or maximum interference Cmax＜0.12mm，k＝0.12。
Further, in the steps (2) and (6), the turning process uses a tool rake angle γ0The angle is more than or equal to 0 degrees, and the radius of the round corner of the tool nose is 0.2-0.4 mm; the specific parameters of the turning 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 ensure that the embedded sealing ring is not stressed or slightly stressed in the radial direction but is not enough to deform in the radial direction, quantitatively move through a radial positioning device to enable the inner diameter of an axial blind hole of a clamp seat to be quantitatively contracted to be just in contact with the side wall of a metal ring seat of the embedded sealing ring, realize the functions of axial positioning and clamping through the clamp seat and the axial positioning device, and take the functions of radial clearance compensation and axial positioning and clamping into consideration, thereby remarkably improving the dimensional precision and form and position tolerance precision of the embedded sealing ring, and providing reference for processing and tool design of similar structural products which are not suitable for adopting a radial clamping and positioning mode.
(2) The invention further discloses a key design parameter selection principle of the processing tool of the embedded sealing ring, which specifically comprises a quantitative selection principle of the number of the open slots with the base and the width of the open slots, and a quantitative selection principle of the width of the through slot of the open pressure ring; the design parameter selection principle is favorable for the standardized design of the similar structure tool, the design period of the processing tool for the embedded sealing ring is shortened, and therefore the production efficiency of the end surface embedded sealing ring of the liquid rocket engine is improved.
(3) The invention discloses a processing method of an embedded sealing ring, which quantificationally provides a selection basis of press-mounting force, heating temperature and press-mounting safety coefficient in a hot-pressing process, can better adapt to the processing of the embedded sealing ring with different interference magnitude requirements, simultaneously ensures that the material performance of a metal ring seat meets the design index, reduces the surface oxidation corrosion of the metal ring seat, and reduces the quality problems of local graphite trimming, fracturing and the like after press mounting; in addition, the method provides a quantitative selection principle of the front angle, the tool nose fillet, the cutting speed, the cutting depth and the feed amount of the turning tool, can effectively improve the graphite turning corner collapse phenomenon, prolongs the service life of the tool, and greatly improves the product yield.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
FIG. 2 is an enlarged view taken at Q of FIG. 1;
FIG. 3 is a schematic structural view of the fixture base of the embodiment of FIG. 1;
FIG. 4 is a schematic view of the structure of FIG. 3 along line A-A;
FIG. 5 is a schematic structural view of the open clamping ring of the embodiment shown in FIG. 1;
the reference numerals are explained below: 1-a clamp seat, 11-a clamping part and 12-an open slot; 2-axial positioning device, 21-compression nut, 22-open compression ring and 23-through groove; 3-radial positioning device, 31-radial compression ring, 32-stroke nut; 4-to-be-processed embedded sealing ring, 41-metal ring seat, and 42-graphite ring sheet.
Detailed Description
The invention will be further described with reference to the drawings and exemplary embodiments.
Referring to fig. 1, the processing tool for the embedded sealing ring comprises a clamp seat 1, an axial positioning device 2 and a radial positioning device 3; one end of the clamp seat 1 is provided with a clamping part 11 connected with a machine tool, the other end of the clamp 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-processed embedded sealing ring 4 is in close contact with the second step end face through the end face of a metal ring seat 41 of the to-be-processed embedded sealing ring 4 to realize axial positioning, and a graphite ring sheet 42 of the to-be-processed embedded sealing ring 4 is positioned in the second axial hole and the third axial hole and keeps a gap with the first step end face; n open grooves 12(n is more than or equal to 8) with the width w and the depth h are uniformly arranged on the circumference of the outlet end of the third axial hole of the clamp seat 1.
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 clamping ring 22 is arranged in the third axial hole, the outer ring wall of the opening clamping ring is matched with the inner diameter of the third axial hole, the axial clamping ring compresses the opening clamping ring 22 to the other end face of the metal ring seat 41 of the embedded sealing ring 4 to be processed along the axial movement, the embedded sealing ring 4 to be processed is axially positioned, the opening clamping ring is axially provided with a through groove 23 with the width of u, and u is equal to (n +1) x w, so that when n open grooves 12 are completely closed, the through groove 23 of the opening clamping ring 22 can still leave a gap, and the phenomenon that the open grooves 12 of the clamp seat 1 are closed and abnormal due to the fact that the through groove 23 of the opening clamping ring 22 is closed 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 close to one side of the clamping part 11 and a stroke nut 32 which is arranged close to 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 stroke nut 32, and the radial compression ring 31 adjusts the inner diameter of the axial blind hole through the open groove 12 and the through groove 23 along with the axial movement of the stroke nut 32.
The outer wall of the clamp seat 1 is a conical surface with a cone angle beta gradually expanded 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; a radial clearance delta between the inner wall of the axial blind hole of the clamp seat 1 and the side wall of the to-be-processed embedded sealing ring 4 and an axial moving distance L of the radial positioning device 3 meet the condition that L is delta multiplied by cot beta; meanwhile, the radial clearance delta, the maximum value phi M of the diameter of the axial blind hole of the clamp seat 1 and the external diameter dimension phi D of the metal ring seat of the embedded sealing ring after grindinghSatisfies the condition that delta is phi M-phi Dh(ii) a 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 both the compression nut and the stroke nut adopt thick threads; when the control precision requirement of the radial gap delta is higher, the value of beta can be reduced, otherwise, when the control precision requirement of the radial gap delta is lower, the value of beta can be increased, but the angle of beta is less than or equal to 30 degrees; in the present embodiment, β is 15 °.
In order to ensure that the mosaic sealing rings 4 to be processed with different diameters have good centering property and uniformity in the radial adjusting process, the number n of the open grooves 12 and the outer diameter PhiD of the metal ring seat of the mosaic sealing ring 4 to be processedmThe relationship is as follows: when phi DmN is not less than 60mm, n is not less than 4 and not more than 6; when the diameter is less than or equal to 60mmmN is not less than 120mm, n is not less than 6 and not more than 8; when phi Dm≥120mm，n≥8。
In order to ensure that the clamp seat 1 has good resilience in the radial adjusting process, the width w of the n open grooves 12 and the outer diameter PhiD of the metal ring seat of the embedded sealing ring 4 to be processedmThe relationship is as follows: when phi DmLess than or equal to 30mm, w is less than or equal to 1 mm; when the phi Dm is more than 30mm and less than or equal to 60mm, w is 1.5 mm; when phi Dm is more than 60mm and less than or equal to 120mm, w is 2 mm; when phi Dm is more than or equal to 120mm, w is more than or equal to 2 mm.
For convenience of settingThe fixture seat 1 is counted, the fixture seat 1 is ensured to have good rebound resilience in the radial adjusting process, and the depth of the n open grooves 12 is h and the depth h of the axial blind hole of the fixture seat 1ZAnd the end surface depth g of the second step of the clamp seat 1 is as follows: h is more than 1.1 xg and less than or equal to 0.75 xhZ。
In this embodiment, the outer diameter Φ D of the metal ring seat of the embedded seal ring 4 to be processedm60mm, clamp seat 1 is located the third axial hole exit end circumference and evenly sets up 6 open slots 12 that the width is 1.5mm, degree of depth is h.
Meanwhile, the invention also provides a processing method of the embedded sealing ring, which comprises the following steps:
step (1): preparation phase of production
Processing the inner hole of the embedded sealing ring metal ring seat 41 according to the design requirement, and simultaneously processing the outer diameter of the embedded sealing ring metal ring seat 41 according to the process requirement, wherein the measured value of the inner diameter PhiA of the metal ring seat 41 meets the design dimension requirement, and the measured value of the outer diameter PhiD of the metal ring seat 41qThe requirement of the reserved subsequent machining allowance of the process is met; numbering the machined metal ring seats 41, and recording the measured diameter phi A of the inner hole of each machined metal ring seat 41;
step (2): processing stage of embedded sealing ring graphite ring sheet 42
(2.1) determining the minimum interference C of the graphite ring sheet 42 and the metal ring seat 41 in interference fit according to the interference index of the outer diameter of the graphite ring sheet and the inner hole diameter of the metal ring seat according to the design requirementminAnd maximum interference Cmax；
(2.2) machining the graphite ring sheet 42 according to the design requirement by adopting a turning machining mode according to the measured value phi A of the diameters of the inner holes of the metal ring seats 41 with different numbers, and then machining the inner hole and the end face of the graphite ring sheet 42 according to the process requirement to ensure that the measured value phi B of the outer diameter of the graphite ring sheet 42 meets the requirements of phi A + Cmin≤ΦB≤ΦA+CmaxReserving subsequent machining allowance for the inner hole and the end face of the graphite ring sheet 42;
and (3): hot press mounting preparation stage for embedded sealing ring
(3.1) calculating the heating temperature t of the metal ring seat 41:
t＝0.8×th
wherein, thThe 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-fitting safety coefficient, and satisfies that k is more than or equal to 0.10 and less than or equal to 0.12, and when the measured value of the outer diameter phi B of the graphite ring sheet 42 is more than 60mm or the minimum interference CminIs more than 0.15mm, k is 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 CmaxNot more than 0.15mm, k is 0.11; when phi B is less than 30mm or maximum interference Cmax＜0.12mm，k＝0.12；
FsThe maximum static pressure borne by the graphite ring sheet 42 satisfies Fs＝σ1×S1≤σbc×S1Wherein σ is1Maximum static load, S, for the graphite ring sheet 421The graphite ring sheet 42 is pressed and assembled with the actual bearing area, sigmabcThe compressive strength of the graphite ring sheet 42;
Fjis the product of the maximum static pressure borne by the metal ring seat 41 and satisfies Fj＝σ2×S2≤σb0.2×S2Wherein σ is2Maximum static load, S, for the metal ring seat 412For pressing the metal ring seat 41 to the actual bearing area, sigmab0.2The compressive strength of the metal ring seat 41;
and (4): hot press mounting stage of embedded sealing ring
Placing the metal ring seat 41 into a high-temperature oven, heating to a heating temperature t, taking out, immediately placing the metal ring seat 41 on a press mounting support tool on a lower press plate of a press machine, pressing the upper press plate of the press machine according to a preset press mounting force F and a press mounting speed v to enable the graphite ring sheet 42 to be attached to the bottom of the metal ring seat 41, and finishing press mounting;
and (5): natural aging stage of embedded sealing ring
Laying lens paper at the bottom of the pressed embedded sealing ring, and flatly placing the embedded sealing ring in a clean drying box for 24 hours in a single layer manner;
and (6): finish machining stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat 41 of the mosaic sealing ring to the design required dimension phi DhAnd then, the embedded sealing ring is arranged in the processing tool for inner hole turning, finally, the sealing end surface of the embedded sealing ring is ground, and the processing is finished when the size and form and position tolerance of the embedded sealing ring meet the design requirements.
In order to improve the corner collapse phenomenon in the graphite cutting process, prolong the service life of the cutter and reduce the production cost, in the step (2) and the step (6), the turning process meets the requirement of the front angle gamma of the cutter0The radius of the corner fillet of the tool nose is more than or equal to 0 degree, the radius of the corner fillet of the tool nose is 0.2-0.4 mm, 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; in this embodiment, the tool rake angle γ0The radius of the tool nose fillet is 0.2mm, the cutting speed is set to 200m/min, the cutting depth is set to 0.05mm, and the feed amount is set to 0.030 mm/r.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (9)
1. The utility model provides a processing frock of inserted sealing 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 clamp seat (1) is provided with a clamping part (11) connected with a machine tool, the other end of the clamp 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-processed embedded sealing ring (4) is in close contact with the second step end face through the end face of a metal ring seat (41) of the to-be-processed embedded sealing ring to realize axial positioning, and a graphite ring sheet (42) of the to-be-processed embedded sealing ring (4) is positioned in the second axial hole and the third axial hole and keeps a gap with the first step end face; n open grooves (12) with the width of w and the depth of h are uniformly arranged at the outlet end of the axial blind hole in the circumferential direction of the clamp seat (1) (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 pressing ring and an opening pressing 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 pressing ring (22) is arranged in the third axial hole, the outer ring wall of the opening pressing ring is matched with the inner diameter of the third axial hole, the axial pressing ring moves along the axial direction to press the opening pressing ring (22) to the other end face of the metal ring seat (41) of the embedded sealing ring (4) to be machined, the embedded sealing ring (4) to be machined is axially positioned, the opening pressing ring is axially provided with a through groove (23) with the width of u, and u is (n +1) xw;
radial positioner (3) suit is on anchor clamps seat (1), and with anchor clamps seat (1) lateral wall in close contact with, radial positioner (3) are along axial displacement, adjust axial blind hole internal diameter through open slot (12) and through groove (23).
2. The processing tool for the mosaic sealing ring according to claim 1, wherein: 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).
3. The processing tool for the mosaic sealing ring according to claim 1 or 2, characterized in that: the radial positioning device (3) comprises a radial compression ring (31) which is arranged close to one side of the clamping part (11) and a stroke nut (32) which is arranged close to one side of 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 close contact with the stroke nut (32).
4. The processing tool for the mosaic sealing ring according to claim 3, wherein: the outer wall of the clamp seat (1) is a conical surface with a taper angle of more than or equal to 30 degrees, which 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 matched with the outer wall of the clamp seat (1).
5. The processing tool for the mosaic sealing 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 processedmThe relationship is as follows: when phi DmN is not less than 60mm, n is not less than 4 and not more than 6; when the diameter is less than or equal to 60mmmN is not less than 120mm, n is not less than 6 and not more than 8; when phi Dm≥120mm，n≥8；
The width w of the n open grooves (12) and the outer diameter PhiD of the metal ring seat of the embedded sealing ring (4) to be processedmThe relationship is as follows: when phi DmLess than or equal to 30mm, w is less than or equal to 1 mm; when the phi Dm is more than 30mm and less than or equal to 60mm, w is 1.5 mm; when phi Dm is more than 60mm and less than or equal to 120mm, w is 2 mm; when phi Dm is more than or equal to 120mm, w is more than or equal to 2 mm;
the depth h of the n open grooves (12) and the depth h of the axial blind hole of the fixture seat (1)ZAnd the end surface depth g of the second step of the clamp seat (1) is as follows: h is more than 1.1 xg and less than or equal to 0.75 xhZ。
6. The machining method of the embedded sealing ring is characterized by comprising the following steps of:
step (1): preparation phase of production
Processing an inner hole of the embedded sealing ring metal ring seat (41) according to design requirements, simultaneously processing the outer diameter of the embedded sealing ring metal ring seat (41) according to process requirements, numbering the processed metal ring seats (41), and recording the measured value phi A of the diameter of the inner hole of each processed metal ring seat (41);
step (2): processing stage of graphite ring sheet (42) of embedded sealing ring
(2.1) determining the minimum interference C of the graphite ring sheet (42) and the metal ring seat (41) in interference fit according to the interference index of the outer diameter of the graphite ring sheet and the inner hole diameter of the metal ring seat (41) required by designminAnd maximum interference Cmax；
(2.2) machining the graphite ring sheet (42) according to the design requirement by adopting a turning machining mode according to the measured value phi A of the inner hole diameters of the metal ring seats (41) with different numbers, and then machining the inner hole and the end face of the graphite ring sheet (42) according to the process requirement to ensure that the measured value phi B of the outer diameter of the graphite ring sheet (42) meets the requirements of phi A + Cmin≤ΦB≤ΦA+CmaxReserving subsequent machining allowance for the inner hole and the end face of the graphite ring sheet (42);
and (3): hot press mounting preparation stage for embedded sealing ring
(3.1) calculating the heating temperature t of the metal ring seat (41):
t＝0.8×th
wherein, thThe metal material used by the metal ring seat (41) has low temperature tempering temperature;
(3.2) calculating the press-fitting force F of the graphite ring sheet (42):
wherein k is press-fitting safety coefficient, FsMaximum static pressure, F, to which the graphite ring sheet (42) is subjectedjIs the product of the maximum static pressure borne by the metal ring seat (41);
and (4): hot press mounting stage of embedded sealing ring
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, pressing the upper press plate of the press downwards according to a preset press mounting force F and a press mounting speed v to enable the graphite ring sheet (42) to be attached to the bottom of the metal ring seat (41), and finishing press mounting;
and (5): natural aging stage of embedded sealing ring
Laying lens paper at the bottom of the pressed embedded sealing ring, and flatly placing the embedded sealing ring in a clean drying box for 24 hours in a single layer manner;
and (6): finish machining stage of embedded sealing ring
Grinding the outer diameter of the metal ring seat (41) of the mosaic sealing ring to the design required dimension PhiDhAnd then installing the insert seal ring into the insert seal ring of claim 1And (3) turning an inner hole of the graphite ring sheet (42) in the machining tool, finally grinding the sealing end face of the embedded sealing ring, and finishing machining when the size and form and position tolerance of the embedded sealing ring meet the design requirements.
7. The method for machining a mosaic seal ring according to claim 6, wherein:
in step (3.2), the maximum static pressure F borne by the graphites：
Fs＝σ1×S1≤σbc×S1
Wherein σ1Maximum static load, S, for the graphite ring sheet (42)1The graphite ring sheet (42) is pressed and assembled with the actual bearing area sigmabcThe compressive strength of the graphite ring sheet (42);
the maximum static pressure F borne by the metal ring seat (41)j：
Fj＝σ2×S2≤σb0.2×S2
Wherein σ2Maximum static load, S, for the metal ring seat (41)2For pressing the metal ring seat (41) to the actual bearing area, sigmab0.2The compressive strength of the metal ring seat (41).
8. The method for machining a mosaic seal ring according to claim 6, wherein: in the step (3.2), the press-fitting safety coefficient k meets the condition that 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 CminIs more than 0.15mm, k is 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 CmaxNot more than 0.15mm, k is 0.11; when phi B is less than 30mm or maximum interference Cmax＜0.12mm，k＝0.12。
9. A method for manufacturing an insert seal ring according to any one of claims 6 to 8, wherein: in the steps (2) and (6), the turning is performed using a tool rake angle γ0The angle is more than or equal to 0 degrees, and the radius of the round corner of the tool nose is 0.2-0.4 mm; said turning being carried outThe specific parameters 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270678.8A CN113878739B (en) | 2021-10-29 | 2021-10-29 | Machining tool and machining method for embedded sealing ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111270678.8A CN113878739B (en) | 2021-10-29 | 2021-10-29 | Machining tool and machining method for embedded sealing ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113878739A true CN113878739A (en) | 2022-01-04 |
| CN113878739B CN113878739B (en) | 2023-10-24 |
Family
ID=79014525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111270678.8A Active CN113878739B (en) | 2021-10-29 | 2021-10-29 | Machining tool and machining method for embedded sealing ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113878739B (en) |
Citations (8)
| 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 |
| CN106670909A (en) * | 2016-12-30 | 2017-05-17 | 西华大学 | Heat cover type grinding device for machining sealing ring with regularly conical surface |
| CN107398746A (en) * | 2017-09-22 | 2017-11-28 | 重庆江增船舶重工有限公司 | A kind of cutting tool and processing method of nozzle outer shroud |
| 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 |
-
2021
- 2021-10-29 CN CN202111270678.8A patent/CN113878739B/en active Active
Patent Citations (8)
| 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 |
| 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 |
| CN106670909A (en) * | 2016-12-30 | 2017-05-17 | 西华大学 | Heat cover type grinding device for machining sealing ring with regularly conical surface |
| CN107398746A (en) * | 2017-09-22 | 2017-11-28 | 重庆江增船舶重工有限公司 | A kind of cutting tool and processing method of nozzle outer shroud |
| CN207710366U (en) * | 2018-01-08 | 2018-08-10 | 三峡大学 | A kind of processing tool of seal washer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113878739B (en) | 2023-10-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110814879B (en) | Sealing structure of deep hole internal grinding tool | |
| CN109732293B (en) | Thin-wall separation type solid retainer processing method | |
| CN108672721B (en) | Anti-deformation process method for machining sealing ring by horizontal lathe | |
| CN102601151A (en) | Method for manufacturing precision combined dies by involute spline open extrusion | |
| CN108568645B (en) | Processing method of thin-wall tube shell quenching hardware | |
| CN113369502A (en) | Turning method of ultrathin-wall bushing | |
| CN112247488A (en) | Process for ensuring precision of ring groove of disc seat sleeve nut | |
| CN112439906B (en) | Machining process of bearing ring in diesel engine | |
| CN113878739B (en) | Machining tool and machining method for embedded sealing ring | |
| CN208230884U (en) | A kind of frock clamp | |
| CN105522342A (en) | Chuck machining method | |
| CN112605738B (en) | Cylindrical grinding clamping method and processing device for thin-wall nonmetallic part with inner ring groove | |
| CN105397415A (en) | Precision machining method for thin plane of core column assembly | |
| CN113941678B (en) | Forging process for hub sleeve warm forging and cold extrusion and die thereof | |
| CN115255838A (en) | Manufacturing process and method of threading and rolling thread rolling wheel | |
| CN115383406A (en) | Method for manufacturing stainless steel elastic piston ring | |
| CN105499960B (en) | A kind of metal parts elastic conjunction device and assembly method | |
| CN110819788B (en) | Limiting device for heat treatment of double-layer structure welding assembly and clamping method | |
| CN112692515A (en) | Machining method for thin-wall part with circumferential hole | |
| CN104565305A (en) | Backlash adjustment method for inlet bearings of rectangular axis speed reducer | |
| CN112518254A (en) | Machining method of high-precision bolt | |
| CN113369953A (en) | Clamp for machining excircle of shim | |
| CN111975302A (en) | Machining method based on sleeve type valve plug part | |
| CN103381542A (en) | Processing method of carbon-coated roller core | |
| CN112958791A (en) | Cylinder body spherical surface machining process and clamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |