CN112589485B - Method for processing special-shaped sealing ring, and process pressing plate and positioning plate for processing - Google Patents
Method for processing special-shaped sealing ring, and process pressing plate and positioning plate for processing Download PDFInfo
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- CN112589485B CN112589485B CN202011280652.7A CN202011280652A CN112589485B CN 112589485 B CN112589485 B CN 112589485B CN 202011280652 A CN202011280652 A CN 202011280652A CN 112589485 B CN112589485 B CN 112589485B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/28—Grooving workpieces
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Abstract
The invention belongs to the technical field of sealing ring machining, and particularly relates to a special-shaped sealing ring machining method and a special-shaped sealing ring machining tool.
Description
Technical Field
The invention belongs to the technical field of machining of sealing rings, and particularly relates to a method for machining a special-shaped sealing ring, a process pressing plate for machining and a positioning plate.
Background
The sealing gasket is a sealing spare part used for machines, equipment and pipelines where fluid exists and has a sealing function. The sealing gasket is made of metal or nonmetal plate-shaped materials through cutting, stamping or cutting and other processes, and is used for sealing connection between pipelines and sealing connection between machine parts of mechanical equipment. It is divided into a metal sealing gasket and a non-metal sealing gasket according to the material.
The polytetrafluoroethylene material has high temperature resistance, ozone resistance, natural aging resistance, vacuum resistance, fuel oil resistance, lubricating oil resistance and strong oxidant resistance, and is widely used in the national defense industry and the civil industry. The polytetrafluoroethylene material abnormal shape guard circle is assembled in the oil pump shell terminal surface abnormal shape groove, plays sealed effect. At present, the polytetrafluoroethylene material abnormal shape guard circle, the current processing method has two kinds: compression molding and machining, wherein a compression molding technology is adopted, PTFE powder is uniformly added into a mold and is compressed into a compact finished product at normal temperature, and the mold is high in manufacturing cost and is not suitable for small-batch development and machining; the existing mechanical processing method is suitable for processing small-batch developed products, but the error in the production process is large. In addition, because the polytetrafluoroethylene material has high plasticity and low hardness, the mechanical processing method and the die pressing forming method have the problems of large plate material removing allowance and high deformation tendency in processing.
Disclosure of Invention
In order to effectively solve the problem of processing deformation of the fluoroplastic special-shaped sealing ring, the invention provides a special-shaped sealing ring processing method which is small in clamping difficulty, easy to position, small in processing error and high in processing efficiency.
Meanwhile, the technical pressure plate 2 and the positioning plate 1 used in the method for processing the special-shaped sealing ring are provided, the method can be used for accurately positioning, has a good fixing effect on a plate, ensures small errors in the processing process, and is high in clamping efficiency.
The technical scheme adopted by the invention is as follows:
a method for processing a special-shaped sealing ring comprises the following steps:
(1) preparing a raw material plate according to the maximum overall dimension of the special-shaped sealing ring to be processed;
(2) reserving allowance according to the contour size of an inner cavity of the special-shaped sealing ring, and processing an 8-shaped groove on the original material plate to ensure that the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring;
(3) roughly milling a prototype of the special-shaped sealing ring by taking the inner molded surface and the outer molded surface of the edge-shaped groove as references;
(4) finely milling the blank inner molded surface of the special-shaped sealing ring to a required size to obtain a semi-finished product special-shaped sealing ring, then loading a process pressing plate 2 into an inner cavity of the semi-finished product special-shaped sealing ring, so that the upper step 21 part of the process pressing plate 2 extends into the inner cavity, and the lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring for fixing;
(5) and (3) finely milling the outer profile of the semi-finished special-shaped sealing ring along the lower outer profile of the process pressing plate 2 to obtain a finished special-shaped sealing ring.
More preferably, the step (2) is specifically:
(2.1) aligning the long edge of the original material plate with the alignment edge on the positioning plate by taking any end face and two adjacent side faces of the original material plate as references;
(2.2) pressing the periphery of the raw material plate on the positioning plate 1 by using a pressing plate;
(2.3) processing two fastening holes in the original material plate according to the positions of 2 positioning holes of the positioning plate 1, and fastening the positioning plate 1 and the original material plate by using screws; because the area of the plate is large, the periphery of the plate is compressed, and the middle of the plate is raised, so that the middle thread compression is increased.
And (2.4) milling 8-shaped grooves on the original material plate according to the inner and outer contour sizes of the special-shaped sealing ring, wherein the inner and outer surfaces of each groove are respectively 3mm and 2mm of allowance according to the molded surface of the part, and the distance between the bottom surface of the shadow part and the positioning plate surface is the thickness size of the part. The inner molded surface and the outer molded surface of the groove are both provided with certain allowance, and the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring.
Preferably, in the step (2.4), a groove is milled on the original material plate according to the inner and outer contour dimensions of the special-shaped sealing ring, so that the inner profile of the groove has a margin of 3mm, the outer profile of the groove has a margin of 2mm, and the distance from the bottom surface of the groove to the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring.
Further preferably, the step (4) is specifically:
(4.1) finely milling the prototype inner molded surface of the special-shaped sealing ring to a required size, wherein the arc size error of the inner molded surfaces at the two ends is-0.1 mm, and the arc size error of the inner molded surfaces at the middle convergence section is +/-0.1 mm, so as to obtain a semi-finished special-shaped sealing ring;
(4.2) the process pressing plate 2 is arranged in an inner cavity of the semi-finished product special-shaped sealing ring, the upper step 21 part of the process pressing plate 2 extends into the inner cavity, the lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring, and the process pressing plate 2 and the workbench are fixed through 2 screws.
More preferably, the step (5) is specifically: and (3) finely milling the outer profile of the semi-finished special-shaped sealing ring along the outer profile of the lower part of the process pressing plate 2, wherein the dimension error of the outer profile arcs positioned at two ends is-0.1 mm, and the dimension error of the outer profile arc positioned at the middle convergence section is +/-0.05 mm, so as to obtain a finished special-shaped sealing ring.
Further preferably, the material of the finished special-shaped sealing ring is fluoroplastic (SFB-1, SFB-2), and the special-shaped sealing ring can also be used for non-metallic materials such as nylon, bakelite and the like.
According to the process press plate for the special-shaped sealing ring processing method, the outer contour of the process press plate 2 is 8-shaped, the circle center points of the circular surfaces at the two ends of the process press plate 2 are respectively processed with the positioning holes, the outer edge of the upper surface of the process press plate 2 is processed into the step 21-shaped structure, the size of the upper outer surface of the process press plate 2 is smaller than that of the lower outer surface by 1mm, and the height of the step 21 at the upper part of the process press plate 2 is smaller than the thickness of the special-shaped sealing ring.
More preferably, the hole diameter of one end positioning hole and the hole diameter of the adjacent end positioning hole are 12mm, and the hole interval is the center distance of 8-shaped holes.
According to the positioning plate for the processing method of the special-shaped sealing ring, the positioning plate 1 is formed by processing spherical crown-shaped steps 12 on the upper surface of a circular plate, the height of each step 12 is 5-10mm, the height of an alignment belt, namely the alignment stroke of a lever gauge head, the distance between the straight line edge of each step 12 and the center point of the positioning plate 1 is 1/2+5mm of the width of a part plate, the alignment edges are aligned mainly through the edges of the parts, so that two centers of 8-shaped holes of the parts are overlapped with the pressing center of the positioning plate, and two positioning holes are processed in the middle of the positioning plate 1 in parallel.
Further preferably, the positioning holes are distributed in the same radial direction, the center distance between the two holes on the clamp plate is equal to the center distance of the 8-shaped hole of the part, the accurate positioning of the inner cavity is guaranteed, the pressing force is uniform and balanced, the pressing force acts on the narrow profile, the outer profile is centered, and the wall thickness is uniform.
Compared with the prior art, the invention has the beneficial effects that:
1) the special-shaped fluoroplastic sealing ring machining device has the advantages that the positioning plate 1 and the process pressing plate 2 are used for clamping at one time, rough milling and finish milling are carried out, the problem of high positioning and clamping difficulty in machining of the special-shaped fluoroplastic sealing ring is effectively solved, the positioning is accurate, the machining error of the special-shaped sealing ring is small, the machining efficiency is high, and the sealing performance of the special-shaped sealing ring is guaranteed.
2) According to the invention, the process pressing plate 2 and the positioning plate 1 which are matched for use are manufactured, and the process pressing plate 2 and the positioning plate 1 are used, so that simple clamping of a plate material during processing is ensured, the positioning is accurate, the cutting and milling are convenient, the clamping efficiency is greatly improved, and meanwhile, the problem of processing deformation of the special-shaped sealing ring is solved in an auxiliary manner.
Drawings
Fig. 1 is a schematic structural diagram of a profiled sealing ring.
Fig. 2 is a schematic structural view of the positioning plate 1.
Fig. 3 is a sectional view of the positioning plate 1 taken along line a-a.
Fig. 4 is a schematic structural view of the process platen 2.
Fig. 5 is a sectional view B-B of the process platen 2.
Detailed Description
For purposes of making the objects, aspects and advantages of the present invention clearer and more readily apparent from the following detailed description of the present invention, when taken in conjunction with the accompanying drawings and examples, it is to be understood that the invention is illustrative and not restrictive, i.e., the embodiments are shown and described as merely a few examples of the invention, rather than as a complete description, and that the components of the embodiments of the invention shown and described in the drawings may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without inventive step, are within the scope of protection of the invention.
It is to be noted that the following relational terms such as "first," "second," and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, and the terms "comprising," "including," or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and examples.
The structure of the opposite-shaped sealing ring processed by the method is shown in figure 1, the outer contour of the opposite-shaped sealing ring is in an 8-shaped structure, the thickness of the opposite-shaped sealing ring is 1.85mm, and because fluoroplastic materials such as polytetrafluoroethylene and the like have high plasticity and low hardness, the plate material is large in removal allowance when being processed by a conventional mechanical processing or compression molding method, the plate material is extremely easy to deform during processing, and the sealing effect is influenced, but in order to solve the problem of processing deformation of the polytetrafluoroethylene material special-shaped protection ring, a self-made process pressing plate 2 and a self-made positioning plate 1 matched with a process method are specially developed, and the specific steps are as follows:
referring to fig. 2 and 3, the positioning plate 1 of the invention is a spherical step 12 processed on the upper surface of a circular plate, the height of the step 12 is designed to be 8mm, and can be designed to be 5-10mm for convenient alignment, the distance between the straight line edge of the step 12 and the central point of the positioning plate 1 is 1/2+5mm of the width of a part plate, the two centers of 8-shaped holes of the part are coincided with the pressing center of the positioning plate mainly by aligning the edges of the part, two first positioning holes 11 are processed in parallel at the middle position of the positioning plate 1, the first positioning holes 11 are distributed at the same radial position, and the hole distance is the central distance of the 8-shaped holes of the part, so that the original material plate can be accurately clamped and clamped during processing, and is fastened through the positioning holes, the processing precision is improved, and the clamping difficulty is reduced.
Further, the deformation index and the machining precision of the positioning plate 1 meet the use requirements, and the positioning plate is mainly used for clamping and positioning an original material plate during rough milling of the original material plate, so that the milling is facilitated.
Referring to fig. 4 and 5, the process pressing plate 2 of the invention is an auxiliary tool for supporting a semi-finished product when finish milling is required after rough machining of a special-shaped seal ring, and is convenient for finish milling operation, the outer contour of the process pressing plate 2 is consistent with the inner contour of the special-shaped seal ring, the process pressing plate is shaped like 8, second positioning holes 22 are respectively machined at the circle centers of the circular faces at the two ends of the process pressing plate 2, the aperture of each of the two second positioning holes 22 is phi 14 (corresponding to two M12 threads of the positioning plate, the phi 14 is used for pressing a part by a screw on a unthreaded hole), the hole pitch is the size of the center distance of the 8-shaped hole of the part, and a step 21-shaped structure is machined at the outer edge of the upper surface of the process pressing plate 2, so that the size of the outer contour of the upper part of the process pressing plate 2 is smaller than that of the outer contour of the lower part by 1mm, and the height of the step 21 of the upper part of the process pressing plate 2 is smaller than the thickness of the special-shaped seal ring.
The method for processing the special-shaped sealing ring by taking the fluoroplastic as the raw material can be realized by the following steps:
(1) preparing a raw material plate according to the maximum overall dimension of the special-shaped sealing ring to be processed;
(2) reserving allowance according to the contour size of an inner cavity of the special-shaped sealing ring, and processing an 8-shaped groove on the original material plate to ensure that the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring; the method specifically comprises the following steps:
(2.1) aligning the long edge of the original material plate with the alignment edge on the positioning plate 1 by taking any end face and two adjacent side faces of the original material plate as references;
(2.2) compressing the periphery of the raw material plate by using a positioning plate 1;
(2.3) processing two fastening holes in the original material plate according to the positions of 2 positioning holes of the positioning plate 1, and fastening the positioning plate 1 and the original material plate by using screws;
and (2.4) milling an 8-shaped groove on the original material plate according to the inner and outer contour sizes of the special-shaped sealing ring, so that certain allowance is left on the inner profile and the outer profile of the groove, and the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring. The inner surface and the outer surface of the groove are respectively reserved with allowance of 3mm and 2mm according to the molded surface of the part, and the distance between the bottom surface of the shadow part and the positioning plate surface is the thickness of the part.
(3) Roughly milling a prototype of the special-shaped sealing ring by taking the inner molded surface and the outer molded surface of the edge-shaped groove as references;
(4) finely milling the blank inner molded surface of the special-shaped sealing ring to a required size to obtain a semi-finished product special-shaped sealing ring, then loading a process pressing plate 2 into an inner cavity of the semi-finished product special-shaped sealing ring, so that the upper step 21 part of the process pressing plate 2 extends into the inner cavity, and the lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring for fixing; the method specifically comprises the following steps:
(4.1) finely milling the prototype inner molded surface of the special-shaped sealing ring to the required size, wherein the size error of the circular arcs of the inner molded surfaces at the two ends is-0.1 mm, and the size error of the circular arc of the inner molded surface at the middle convergence section is +/-0.1 mm, so as to obtain a semi-finished special-shaped sealing ring;
(4.2) the process pressing plate 2 is arranged in an inner cavity of the semi-finished product special-shaped sealing ring, the upper step 21 part of the process pressing plate 2 extends into the inner cavity, the lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring, and the process pressing plate 2 and the workbench are fixed through 2 screws.
(5) And (3) finely milling the outer profile of the semi-finished special-shaped sealing ring along the outer profile of the lower part of the process pressing plate 2, wherein the dimension error of the outer profile arcs positioned at two ends is-0.1 mm, and the dimension error of the outer profile arc positioned at the middle convergence section is +/-0.05 mm, so as to obtain a finished special-shaped sealing ring.
In order to further explain the technical scheme of the invention, a polytetrafluoroethylene material is taken as a raw material, and an 8-shaped sealing ring which can be used for sealing connection at a fluid pipeline interface is processed as an example for explanation.
The special-shaped sealing ring with the structure shown in figure 1 is made of SFB-2 and is in an 8-shaped structure, the height of the sealing ring is 1.85 +/-0.05 mm, the wall thickness along a molded surface is 1 +/-0.1 mm, and the maximum size of the excircle of two ends is
The radius R of the transition arc of the middle convergent section is
The positioning plate 1 used in the embodiment is formed by pressing a round rod with the diameter phi of 200mm on a workbench, milling a large surface, milling a side surface and finding a front surface, milling a step 12 with the height of 8mm on the upper surface of the positioning plate, wherein the distance between the straight line edge of the step 12 and the central point is 65 +/-0.1 mm, and the step surface and the outer edge of the positioning plate 1 form a spherical crown shape, so that the positioning plate 1 is manufactured and plays a role of pressing parts during processing. The total thickness of the positioning plate 1 is 30mm, wherein the height of the step 12 is 8mm, and the side surface and the bottom surface of the step 12 form a positioning surface for alignment. Two first locating holes 11 which are parallel to each other are machined in the middle of the locating plate 1 on the diameter parallel to the surface of the step 12 and used for fastening after alignment and alignment, the hole distance between the two first locating holes 11 is 66 +/-0.1 mm, and the distance between the center of each first locating hole 11 and the center of the locating plate 1 is 66/2 mm-33 mm.
In order to ensure the compression effect, the first positioning hole 11 of the present embodiment is processed into an inner step hole, the inner diameter of the large hole of the first positioning hole 11 is 20mm, the inner diameter of the small hole is 12mm, the depth of the large hole is adapted to the top of the M12 positioning screw, and it is sufficient to ensure that the screw is embedded in the first positioning hole 11.
The process press plate 2 used in the embodiment is 8-like, the outer edge of the upper surface of the process press plate 2 is processed into a step 21-shaped structure, the size of the upper outer profile of the process press plate 2 is 0.9mm smaller than that of the lower outer profile, the height of the upper step 21 of the process press plate 2 is smaller than that of the special-shaped sealing ring, namely, the contour of the upper surface is contracted by 1mm, the height of a boss is 1.6 +/-0.05 mm and is smaller than that of the special-shaped sealing ring by 1.85 +/-0.05 mm, a step 21 shape is formed, and the sealing ring is guaranteed to be pressed stably and reliably during processing. The sizes of the large-circle external profiles at the two ends
The size of the outer surface of the big circle at two ends of the special-shaped sealing ring
The size is 2mm (namely the single side is 1mm), the molded surface at the boss is 0.9mm along the peripheral dimension, and the process pressing plate 2 is ensured not to protrude out of the outer molded surface of the special-shaped sealing ring and not to interfere with the inner molded surface of the special-shaped sealing ring when in use.Second positioning holes 22 are respectively processed at the circle center points of the circular surfaces at the two ends of the process pressing plate 2, the aperture of each second positioning hole 22 is 14mm, and the hole distance is 66 +/-0.05 mm.
By using the specially-made process press plate 2 and the positioning plate 1 of the embodiment as the tool, the specific processing method comprises the following steps:
(1) preparing a raw material plate according to the maximum overall dimension of the special-shaped sealing ring, and determining the prepared material size as follows: delta 4X 190X 120 (single material, unit: mm);
(2) milling a plate by adopting a mode of milling a profile by a triaxial processing center, aligning a long edge of an original material plate with an alignment edge on a positioning plate 1 by taking any end surface and two adjacent side surfaces of the original material plate as references, pressing the periphery of the original material plate, processing two fastening holes on the original material plate according to the positions of 2 first positioning holes 11 of the positioning plate 1, fastening the positioning plate 1 and the original material plate by using an M12 screw, milling an 8-shaped groove on the original material plate according to the inner and outer contour sizes of a special-shaped sealing ring, reserving 3mm of allowance on the inner profile surface of the groove and 2mm of allowance on the outer profile surface, wherein the distance from the bottom surface of the groove to the bottom surface of the original material plate is the thickness of the special-shaped sealing ring,
(3) roughly milling a prototype of the special-shaped sealing ring along the inner profile surface and the outer profile surface of the groove as a reference;
(4) the method comprises the steps of finely milling a prototype inner molded surface of the special-shaped sealing ring to a required size, wherein the arc size error of the inner molded surface at two ends is-0.1 mm, the arc size error of the inner molded surface at a middle convergence section is +/-0.1 mm, obtaining a semi-finished special-shaped sealing ring, then installing a process pressing plate 2 into an inner molded cavity of the semi-finished special-shaped sealing ring, enabling an upper step 21 part of the process pressing plate 2 to extend into the inner molded cavity, enabling a lower part of the process pressing plate to extend to the outside of the inner molded cavity and be tightly attached to the semi-finished special-shaped sealing ring, and fixing the process pressing plate 2 and a workbench by 2 screws.
(5) The outer profile of the semi-finished special-shaped sealing ring is finely milled along the outer profile of the lower part of the process pressing plate 2, the dimension error of the outer profile circular arc at the two ends is-0.1 mm, the dimension error of the outer profile circular arc at the middle convergence section is +/-0.05 mm, and the special-shaped sealing ring finished product is prepared, the diameter phi of the outer profile circular arc at the two ends is large
The distance between the central points of the great circles at the two ends is 66 +/-0.05 mm.
The method can also process the special-shaped sealing ring with other specifications, and the invention effectively solves the problem of high positioning and clamping difficulty in the processing of the fluoroplastic special-shaped sealing ring by clamping at one time by the positioning plate 1 and the process pressing plate 2, has accurate positioning, small processing error of the special-shaped sealing ring and high processing efficiency, and ensures the sealing performance of the special-shaped sealing ring.
Claims (9)
1. A method for processing a special-shaped sealing ring is characterized by comprising the following steps:
(1) preparing a raw material plate according to the maximum overall dimension of the special-shaped sealing ring to be processed;
(2) reserving allowance according to the contour size of an inner cavity of the special-shaped sealing ring, and processing an 8-shaped groove on the original material plate to ensure that the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring;
(3) roughly milling a prototype of the special-shaped sealing ring by taking the inner molded surface and the outer molded surface of the edge-shaped groove as references;
(4) finely milling a prototype inner molded surface of the special-shaped sealing ring to a required size to obtain a semi-finished product special-shaped sealing ring, then installing a process pressing plate (2) into an inner cavity of the semi-finished product special-shaped sealing ring, so that an upper step (21) part of the process pressing plate (2) extends into the inner cavity, and a lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring for fixation;
(5) finely milling the outer profile of the semi-finished special-shaped sealing ring along the lower outer contour of the process pressing plate (2) to obtain a finished special-shaped sealing ring;
the step (2) is specifically as follows:
(2.1) aligning the long edge of the original material plate with the alignment edge on the positioning plate (1) by taking any end surface and two adjacent side surfaces of the original material plate as references;
(2.2) pressing the periphery of the raw material plate on the positioning plate (1) by a pressing plate;
(2.3) processing two fastening holes in the original material plate according to the positions of 2 positioning holes of the positioning plate (1), and fastening the positioning plate (1) and the original material plate by using screws;
and (2.4) milling an 8-shaped groove on the original material plate according to the inner and outer contour sizes of the special-shaped sealing ring, so that certain allowance is left on the inner profile and the outer profile of the groove, and the distance between the bottom surface of the groove and the bottom surface of the original material plate is equal to the thickness of the special-shaped sealing ring.
2. A method for processing a special-shaped sealing ring according to claim 1, wherein the step (2.4) is to mill a groove on the raw material plate according to the inner and outer contour dimensions of the special-shaped sealing ring, so that the inner profile surface of the groove has a margin of 3mm, the outer profile surface has a margin of 2mm, and the distance from the bottom surface of the groove to the bottom surface of the raw material plate is equal to the thickness of the special-shaped sealing ring.
3. The method for processing the special-shaped sealing ring according to any one of claims 1 to 2, wherein the step (4) is specifically as follows:
(4.1) finely milling the prototype inner molded surface of the special-shaped sealing ring to a required size, wherein the arc size error of the inner molded surfaces at the two ends is-0.1 mm, and the arc size error of the inner molded surfaces at the middle convergence section is +/-0.1 mm, so as to obtain a semi-finished special-shaped sealing ring;
(4.2) a process pressing plate (2) is arranged in an inner cavity of the semi-finished product special-shaped sealing ring, so that an upper step (21) of the process pressing plate (2) extends into the inner cavity, a lower part of the process pressing plate extends to the outside of the inner cavity and is tightly attached to the semi-finished product special-shaped sealing ring, and the process pressing plate (2) is fixed with the workbench through 2 screws.
4. The method for processing the special-shaped sealing ring according to any one of claims 1 to 2, wherein the step (5) is specifically as follows: and (3) finely milling the outer profile of the semi-finished special-shaped sealing ring along the outer profile of the lower part of the process pressing plate (2), wherein the dimension error of the outer profile arcs at two ends is-0.1 mm, and the dimension error of the outer profile arc at the middle convergence section is +/-0.05 mm, so as to obtain a finished special-shaped sealing ring.
5. A method for processing a profiled sealing ring according to claim 1, wherein the finished profiled sealing ring is made of fluoroplastic, nylon or bakelite.
6. The process pressing plate for the machining method of the special-shaped sealing ring according to claim 1, characterized in that the outer contour of the process pressing plate (2) is 8-shaped, positioning holes are respectively machined at the circle centers of the circular surfaces at the two ends of the process pressing plate (2), a step (21) type structure is machined at the outer edge of the upper surface of the process pressing plate (2), so that the size of the outer surface of the upper part of the process pressing plate (2) is 1mm smaller than that of the outer surface of the lower part, and the height of the step (21) of the upper part of the process pressing plate (2) is smaller than the thickness of the special-shaped sealing ring.
7. The process press plate for a machining method of a profiled sealing ring according to claim 6, wherein the diameter of the positioning hole at one end and the diameter of the positioning hole at the adjacent end are 12mm, and the hole pitch is the center distance of the 8-shaped holes.
8. The positioning plate for the machining method of the special-shaped sealing ring according to claim 1, characterized in that the positioning plate (1) is a step (12) which is machined into a spherical crown shape on the upper surface of a circular plate, the height of the step (12) is 5-10mm, the height of a leveling belt is the stroke of lever gauge head leveling, the distance between the straight line edge of the step (12) and the central point of the positioning plate (1) is 1/2+5mm of the width of a part plate, the leveling edges are mainly aligned through the alignment of the sides of the part, so that the two centers of 8-shaped holes of the part are coincided with the pressing center of the positioning plate, and two positioning holes are machined in parallel in the middle of the positioning plate (1).
9. The positioning plate for a special-shaped sealing ring machining method according to claim 8, wherein the positioning holes are distributed in the same radial direction, and the distance between the two holes on the clamp plate and the center of the 8-shaped hole of the part is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280652.7A CN112589485B (en) | 2020-11-16 | 2020-11-16 | Method for processing special-shaped sealing ring, and process pressing plate and positioning plate for processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280652.7A CN112589485B (en) | 2020-11-16 | 2020-11-16 | Method for processing special-shaped sealing ring, and process pressing plate and positioning plate for processing |
Publications (2)
| Publication Number | Publication Date |
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| CN112589485A CN112589485A (en) | 2021-04-02 |
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| CN113389900B (en) * | 2021-06-22 | 2022-06-14 | 成都飞机工业（集团）有限责任公司 | Special-shaped sealing ring for vacuum milling fixture of skin parts and use method thereof |
| CN114054815B (en) * | 2022-01-18 | 2022-05-10 | 成都飞机工业（集团）有限责任公司 | High-precision special-shaped hole machining method |
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