A sealing ring blank pressing tool and a sealing ring pressing method

Abstract

The present invention relates to the field of high-pressure sealing technology, and in particular to a sealing ring blank pressing tool and a sealing ring pressing method. The sealing ring blank pressing tool comprises an outer ring sleeve and an inner ring sleeve, wherein the outer ring sleeve is sleeved outside the inner ring sleeve, the bottom of the outer ring sleeve has a first annular cutter, the bottom of the inner ring sleeve has a second annular cutter, the bottom of the outer ring sleeve has a blank accommodating space, and the blank accommodating space is located on the inner side of the first annular cutter; the parts are pressed by a non-overlapping annular feeding method, which solves the problem of fracture and surface bubbling of the pressed parts under the action of high pressure. By adopting the above-mentioned structural form, the sizes of the first annular cutter and the second annular cutter can be determined according to the appropriate blank blanking, and the thickness of the flash of the formed parts is controlled within a suitable range, which is conducive to the removal of the flash.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure sealing, and in particular to a sealing ring blank pressing tool and a sealing ring pressing method. Background Art

[0002] In the prior art, such as Figure 1 When pressing annular seals (such as O-rings, washers, star-shaped seals), the current pressing process regulations do not specify the feeding method. Operators use scissors to cut strips from the raw rubber material that has been rolled to a certain thickness, and overlap them into a ring to press the parts. When pressing annular seals (such as star-shaped seals) with anisotropic cross-sectional shapes using this pressing process regulation, the performance of the pressed parts is far from meeting the use requirements.

[0003] The parts pressed using the current process regulations have the following two problems:

[0004] 1. When using scissors to cut strips from the raw rubber and overlap them into ring-shaped blanks for pressing parts, due to manual feeding, the size and weight of the blanks cannot be effectively controlled, which will cause the pressed parts to be unshaped and the flash thickness to be difficult to control within the appropriate range, and the flash is difficult to remove;

[0005] 2. After the pressed parts were filled with high-pressure nitrogen of 14Mpa and placed for three and seven days, they broke and bubbles appeared on the surface, resulting in the air tightness of the product failing to meet the standards, and the qualified rate was only about 20%.

[0006] Therefore, the inventor provides a sealing ring blank pressing tool and a sealing ring pressing method. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] The invention provides a sealing ring blank pressing tool and a sealing ring pressing method, so as to solve the problems existing in the prior art that parts are not formed, the thickness of the flash is difficult to control within a suitable range, the flash is difficult to remove, and the flash is prone to breakage and surface bubbling.

[0009] (II) Technical solution

[0010] In order to solve the above technical problems, the present invention provides a method for pressing a sealing ring, which uses a sealing ring blank pressing tool to press the sealing ring, wherein the sealing ring blank pressing tool comprises an outer ring sleeve and an inner ring sleeve, the outer ring sleeve is sleeved outside the inner ring sleeve, the bottom of the outer ring sleeve has a first annular cutter, the bottom of the inner ring sleeve has a second annular cutter, the bottom of the outer ring sleeve has a blank accommodating space, and the blank accommodating space is located on the inner side of the first annular cutter; the outer side of the second annular cutter and the blank accommodating space together constitute a blank accommodating cavity; the inner side of the second annular cutter has a waste accommodating cavity;

[0011] The sealing ring pressing method comprises the following steps:

[0012] S1, preparing raw rubber, and rolling the raw rubber to form sheet-like raw rubber, wherein the raw rubber is within the shelf life;

[0013] S2, placing the outer ring sleeve on the sheet of raw rubber material, the sheet of raw rubber material covers the bottom end of the outer ring sleeve, and the blade of the first annular cutter is away from the position where there are bubbles in the sheet of raw rubber material;

[0014] S3, inserting the inner ring sleeve into the outer ring sleeve, so that the blade of the first annular cutter and the blade of the second annular cutter fall on the sheet of raw rubber material, and the blade of the second annular cutter is away from the position where there are bubbles in the sheet of raw rubber material;

[0015] S4, punching the inner ring sleeve by external force, so that the blade of the first annular cutter and the blade of the second annular cutter cut toward the sheet-like raw rubber material;

[0016] S5, obtaining a pressed sealing ring;

[0017] S6, inserting a waste flushing rod into the waste flushing hole to flush out the waste in the waste containing cavity;

[0018] S7, separating the first annular cutter and the second annular cutter, and taking out the pressed sealing ring blank from the blank accommodating cavity;

[0019] S8. The pressed sealing ring is subjected to a molding process under set temperature and pressure conditions to obtain a sealing ring with a star-shaped cross section.

[0020] Preferably, the outer side of the first annular cutter is an inclined surface, and the inner side is a vertical surface.

[0021] Preferably, the outer side of the second annular cutter is a vertical surface, and the inner side is an inclined surface, so that the outer side and the inner side of the processed blank are vertical surfaces.

[0022] Preferably, a waste flushing hole communicating with the waste accommodating cavity is provided on the top of the inner ring sleeve.

[0023] Preferably, the top side edge of the inner ring sleeve has a limiting ridge protruding in the circumferential direction.

[0024] Preferably, the bottom surface of the limiting protrusion is in contact with the top surface of the outer ring sleeve.

[0025] Preferably, when the bottom surface of the limiting convex edge is in contact with the top surface of the outer ring sleeve, the cutting edge of the first annular cutter and the cutting edge of the second annular cutter are located in the same plane.

[0026] (III) Beneficial effects

[0027] The above technical solution of the present invention has the following advantages:

[0028] In the present application, the outer ring sleeve is placed on the sheet of raw rubber, and the sheet of raw rubber covers the bottom end of the outer ring sleeve; the inner ring sleeve is inserted into the outer ring sleeve so that the blade of the first annular cutter and the blade of the second annular cutter fall on the sheet of raw rubber; the inner ring sleeve and the outer ring sleeve are punched by external force so that the blade of the first annular cutter and the blade of the second annular cutter cut toward the sheet of raw rubber, and a pressed sealing ring 3 is obtained; the sealing ring obtained by the above method is an integrated annular structure, which can effectively control the outer size and weight of the blank, and reduce the problem of unformed parts pressed. Since the parts are pressed by the non-overlapping annular feeding method, the problem of fracture and surface bubbling of the pressed parts under the action of high pressure is solved. In addition, by adopting the above structural form, the size of the first annular cutter and the second annular cutter can be determined according to the appropriate blank blanking, that is, the space of the blank accommodating cavity can be accurately determined, and the thickness of the flash of the pressed sealing ring formed after further molding is controlled within a suitable range, which is conducive to the removal of the flash. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a qualified sealing ring processed in the prior art;

[0030] Figure 2 It is a schematic diagram of the structure of the inner ring sleeve in the present invention;

[0031] Figure 3 It is a schematic cross-sectional structural diagram of the outer ring sleeve and the inner ring sleeve in the present invention in a matching state.

[0032] In the figure: 1, inner ring sleeve; 2, outer ring sleeve; 3, sealing ring; 4, blank accommodating cavity; 101, waste punching hole; 102, waste accommodating cavity; 103, limiting convex edge. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "middle", "upper", "lower", "vertical", "oblique", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0035] like Figure 1-Figure 3 As shown, the sealing ring blank pressing tooling of the embodiment of the present invention includes an outer ring sleeve 2 and an inner ring sleeve 1, the outer ring sleeve is sleeved on the outside of the inner ring sleeve, the bottom of the outer ring sleeve has a first annular cutter, the bottom of the inner ring sleeve has a second annular cutter, the bottom of the outer ring sleeve has a blank accommodating space, and the blank accommodating space is located on the inner side of the first annular cutter; the outer side of the second annular cutter and the blank accommodating space together constitute a blank accommodating cavity 4; the inner side of the second annular cutter has a waste accommodating cavity 102.

[0036] When pressing parts in the prior art, the cavity size of the mold for pressing the parts is small and irregular, which causes the rubber to flow unsmoothly and the rubber molecules to be unreliably bonded at the overlapping positions. Under the action of high pressure, the pressed parts are very likely to break at the overlapping positions.

[0037] In the above embodiment of the present application, the outer ring sleeve is placed on the sheet of raw rubber material, and the sheet of raw rubber material covers the bottom end of the outer ring sleeve; the inner ring sleeve is inserted into the outer ring sleeve, so that the blade of the first annular cutter and the blade of the second annular cutter fall on the sheet of raw rubber material; the inner ring sleeve and the outer ring sleeve are punched by external force, so that the blade of the first annular cutter and the blade of the second annular cutter are cut to the sheet of raw rubber material, and a pressed sealing ring 3 is obtained; the sealing ring obtained by the above method is an integrated annular structure, which can effectively control the outer size and weight of the blank, and reduce the problem of unformed parts pressed. Since the parts are pressed by the non-overlapping annular feeding method, the problem of fracture and surface bubbling of the pressed parts under the action of high pressure is solved. In addition, by adopting the above structural form, the size of the first annular cutter and the second annular cutter can be determined according to the appropriate blank blanking, that is, the space of the blank accommodating cavity can be accurately determined, and the pressed sealing ring is further molded, and the thickness of the flash of the formed part is controlled within a suitable range, which is conducive to the removal of the flash.

[0038] Preferably, the outer side of the first annular cutter is an inclined surface, and the inner side is a vertical surface; the outer side of the second annular cutter is a vertical surface, and the inner side is an inclined surface, so that the outer side and inner side of the processed blank are vertical surfaces, and the outer side and inner side of the processed blank are flat vertical surfaces, so that when the outer side and inner side of the blank are subsequently molded, it is easier to calculate and set the molding temperature and pressure.

[0039] Preferably, a waste punching hole 101 communicating with the waste accommodating cavity is provided at the top of the inner ring sleeve. In this way, after the pressing is completed, the waste can be punched out by inserting the waste punching rod into the waste punching hole. The operation is convenient.

[0040] Preferably, the top side of the inner ring sleeve has a circumferentially protruding limiting convex edge 103. The limiting convex edge allows the inner ring sleeve to have a predetermined stroke during the stamping process, so that the blade of the second annular cutter of the inner ring sleeve is not excessively punched out and damaged.

[0041] Preferably, the bottom surface of the limiting convex edge is fitted with the top surface of the outer ring sleeve to achieve precise matching and accurate limiting of the inner ring sleeve and the outer ring sleeve, thereby achieving that the blade of the first annular cutter and the blade of the second annular cutter are located in the same plane, thereby improving the pressing quality of the product.

[0042] Preferably, another aspect of the present application provides a method for pressing a sealing ring using the sealing ring blank pressing tool, which comprises the following steps:

[0043] S1, preparing raw rubber material, and rolling the raw rubber material to form a sheet of raw rubber material;

[0044] S2, placing the outer ring sleeve on the sheet of raw rubber material, so that the sheet of raw rubber material covers the bottom end of the outer ring sleeve;

[0045] S3, inserting the inner ring sleeve into the outer ring sleeve, so that the blade of the first annular cutter and the blade of the second annular cutter fall on the sheet of raw rubber;

[0046] S4, punching the inner ring sleeve by external force, so that the inner ring sleeve drives the outer ring sleeve to move together, so that the blade of the first annular cutter and the blade of the second annular cutter cut toward the sheet-like raw rubber material;

[0047] S5. Obtain a pressed sealing ring.

[0048] Preferably, the method further comprises the following steps:

[0049] S6, inserting a waste flushing rod into the waste flushing hole to flush out the waste in the waste containing cavity;

[0050] S7, separating the first annular cutter and the second annular cutter, and taking out the pressed sealing ring from the blank accommodating cavity;

[0051] S8. The pressed sealing ring is subjected to a molding process under set temperature and pressure conditions to obtain a sealing ring with a star-shaped cross section.

[0052] Through the above method, the waste material can be taken out and the pressed sealing ring can be taken out very conveniently.

[0053] The raw rubber in step S1 is within the shelf life; expired rubber that has passed re-inspection cannot be used to press parts. Because when the above conditions are met, the parts pressed by using expired rubber that has passed re-inspection and new rubber are tested and compared. The parts pressed by using new rubber basically solve the problem of bubbles on the surface of parts under high-pressure working environment.

[0054] Preferably, in step S2, the blade of the first annular cutter is kept away from the position where the bubbles are in the sheet of raw rubber; in step S3, the blade of the second annular cutter is kept away from the position where the bubbles are in the sheet of raw rubber. During the pressing process, the air in the bubbles on the blank may not be completely discharged, causing the rubber molecules here to be loosely combined and produce gaps. If there are gaps on the pressed parts, the high-pressure gas will enter the pressed parts under the action of high pressure, causing bubbles on the surface of the parts.

[0055] The present application adopts an improved star-shaped sealing ring pressing process procedure to press parts, which effectively controls the problem of part non-forming, the problem of part flash being difficult to remove, and basically solves the problem of star-shaped sealing rings not breaking and bubbling on the surface after being filled with high-pressure nitrogen 14Mpa and placed for three and seven days. The airtightness qualification rate of the product is increased from about 20% to more than 90%, which greatly reduces the labor intensity of plastic pressing workers and product assembly workers, and ensures the performance requirements and production progress of the entire product.

[0056] In summary, the technical solution provided by this application has the following effects:

[0057] 1. Reduce the problem of unformed parts produced by pressing;

[0058] 2. Control the flash thickness of the pressed parts within an appropriate range to facilitate the removal of flash;

[0059] 3. Effectively control the cracking and surface bubbling of the pressed parts after being filled with high-pressure nitrogen of 14Mpa for three and seven days, thereby improving the airtightness qualification rate of the products.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for pressing a sealing ring, characterized in that: The sealing ring is pressed by using a sealing ring blank pressing tool, the sealing ring blank pressing tool comprises an outer ring sleeve and an inner ring sleeve, the outer ring sleeve is sleeved outside the inner ring sleeve, the bottom of the outer ring sleeve has a first annular cutter, the bottom of the inner ring sleeve has a second annular cutter, the bottom of the outer ring sleeve has a blank accommodating space, and the blank accommodating space is located on the inner side of the first annular cutter; The outer side of the second annular cutter and the blank accommodating space together form a blank accommodating cavity; The inner side of the second annular cutter has a waste accommodating cavity; The sealing ring pressing method comprises the following steps: S1, preparing raw rubber, and rolling the raw rubber to form sheet-like raw rubber, wherein the raw rubber is within the shelf life; S2, placing the outer ring sleeve on the sheet of raw rubber material, the sheet of raw rubber material covers the bottom end of the outer ring sleeve, and the blade of the first annular cutter is away from the position where there are bubbles in the sheet of raw rubber material; S3, inserting the inner ring sleeve into the outer ring sleeve, so that the blade of the first annular cutter and the blade of the second annular cutter fall on the sheet of raw rubber material, and the blade of the second annular cutter is away from the position where there are bubbles in the sheet of raw rubber material; S4, punching the inner ring sleeve by external force, so that the blade of the first annular cutter and the blade of the second annular cutter cut toward the sheet-like raw rubber material; S5, obtaining a pressed sealing ring; S6, inserting a waste flushing rod into the waste flushing hole to flush out the waste in the waste containing cavity; S7, separating the first annular cutter and the second annular cutter, and taking out the pressed sealing ring blank from the blank accommodating cavity; S8. The pressed sealing ring is subjected to a molding process under set temperature and pressure conditions to obtain a sealing ring with a star-shaped cross section.

2. The method for pressing a sealing ring according to claim 1, characterized in that: The outer side of the first annular cutter is an inclined surface, and the inner side is a vertical surface.

3. The method for pressing a sealing ring according to claim 1, characterized in that: The outer side of the second annular cutter is a vertical surface, and the inner side is an inclined surface, so that the outer side and the inner side of the processed blank are vertical surfaces.

4. The method for pressing a sealing ring according to claim 1, characterized in that: The top of the inner ring sleeve is provided with a waste flushing hole connected to the waste accommodating cavity.

5. The method for pressing a sealing ring according to any one of claims 1 to 4, characterized in that: The top side edge of the inner ring sleeve is provided with a limiting convex edge protruding in the circumferential direction.

6. The method for pressing a sealing ring according to claim 5, characterized in that: The bottom surface of the limiting convex edge is in contact with the top surface of the outer ring sleeve.

7. The method for pressing a sealing ring according to claim 6, characterized in that: When the bottom surface of the limiting convex edge is in contact with the top surface of the outer ring sleeve, the cutting edge of the first annular cutter and the cutting edge of the second annular cutter are located in the same plane.

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